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/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined(_WIN32)
#include <process.h>
#define usleep(X) Sleep(((X)+999)/1000)
#else
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include "mDNSEmbeddedAPI.h"
#include "DNSCommon.h"
#include "uDNS.h"
#include "uds_daemon.h"
#ifdef __ANDROID__
#include "cutils/sockets.h"
#endif
// Normally we append search domains only for queries with a single label that are not
// fully qualified. This can be overridden to apply search domains for queries (that are
// not fully qualified) with any number of labels e.g., moon, moon.cs, moon.cs.be, etc.
mDNSBool AlwaysAppendSearchDomains = mDNSfalse;
// Apple-specific functionality, not required for other platforms
#if APPLE_OSX_mDNSResponder
#include <sys/ucred.h>
#ifndef PID_FILE
#define PID_FILE ""
#endif
#endif
#if APPLE_OSX_mDNSResponder
#include <WebFilterDNS/WebFilterDNS.h>
#if ! NO_WCF
int WCFIsServerRunning(WCFConnection *conn) __attribute__((weak_import));
int WCFNameResolvesToAddr(WCFConnection *conn, char* domainName, struct sockaddr* address, uid_t userid) __attribute__((weak_import));
int WCFNameResolvesToName(WCFConnection *conn, char* fromName, char* toName, uid_t userid) __attribute__((weak_import));
// Do we really need to define a macro for "if"?
#define CHECK_WCF_FUNCTION(X) if (X)
#endif // ! NO_WCF
#else
#define NO_WCF 1
#endif // APPLE_OSX_mDNSResponder
// User IDs 0-500 are system-wide processes, not actual users in the usual sense
// User IDs for real user accounts start at 501 and count up from there
#define SystemUID(X) ((X) <= 500)
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - Types and Data Structures
#endif
typedef enum
{
t_uninitialized,
t_morecoming,
t_complete,
t_error,
t_terminated
} transfer_state;
typedef struct request_state request_state;
typedef void (*req_termination_fn)(request_state *request);
typedef struct registered_record_entry
{
struct registered_record_entry *next;
mDNSu32 key;
client_context_t regrec_client_context;
request_state *request;
mDNSBool external_advertise;
mDNSInterfaceID origInterfaceID;
AuthRecord *rr; // Pointer to variable-sized AuthRecord (Why a pointer? Why not just embed it here?)
} registered_record_entry;
// A single registered service: ServiceRecordSet + bookkeeping
// Note that we duplicate some fields from parent service_info object
// to facilitate cleanup, when instances and parent may be deallocated at different times.
typedef struct service_instance
{
struct service_instance *next;
request_state *request;
AuthRecord *subtypes;
mDNSBool renameonmemfree; // Set on config change when we deregister original name
mDNSBool clientnotified; // Has client been notified of successful registration yet?
mDNSBool default_local; // is this the "local." from an empty-string registration?
mDNSBool external_advertise; // is this is being advertised externally?
domainname domain;
ServiceRecordSet srs; // note -- variable-sized object -- must be last field in struct
} service_instance;
// for multi-domain default browsing
typedef struct browser_t
{
struct browser_t *next;
domainname domain;
DNSQuestion q;
} browser_t;
struct request_state
{
request_state *next;
request_state *primary; // If this operation is on a shared socket, pointer to primary
// request_state for the original DNSServiceCreateConnection() operation
dnssd_sock_t sd;
dnssd_sock_t errsd;
mDNSu32 uid;
void * platform_data;
// Note: On a shared connection these fields in the primary structure, including hdr, are re-used
// for each new request. This is because, until we've read the ipc_msg_hdr to find out what the
// operation is, we don't know if we're going to need to allocate a new request_state or not.
transfer_state ts;
mDNSu32 hdr_bytes; // bytes of header already read
ipc_msg_hdr hdr;
mDNSu32 data_bytes; // bytes of message data already read
char *msgbuf; // pointer to data storage to pass to free()
const char *msgptr; // pointer to data to be read from (may be modified)
char *msgend; // pointer to byte after last byte of message
// reply, termination, error, and client context info
int no_reply; // don't send asynchronous replies to client
mDNSs32 time_blocked; // record time of a blocked client
int unresponsiveness_reports;
struct reply_state *replies; // corresponding (active) reply list
req_termination_fn terminate;
DNSServiceFlags flags;
union
{
registered_record_entry *reg_recs; // list of registrations for a connection-oriented request
struct
{
mDNSInterfaceID interface_id;
mDNSBool default_domain;
mDNSBool ForceMCast;
domainname regtype;
browser_t *browsers;
} browser;
struct
{
mDNSInterfaceID InterfaceID;
mDNSu16 txtlen;
void *txtdata;
mDNSIPPort port;
domainlabel name;
char type_as_string[MAX_ESCAPED_DOMAIN_NAME];
domainname type;
mDNSBool default_domain;
domainname host;
mDNSBool autoname; // Set if this name is tied to the Computer Name
mDNSBool autorename; // Set if this client wants us to automatically rename on conflict
mDNSBool allowremotequery; // Respond to unicast queries from outside the local link?
int num_subtypes;
service_instance *instances;
} servicereg;
struct
{
mDNSInterfaceID interface_id;
mDNSu32 flags;
mDNSu32 protocol;
DNSQuestion q4;
DNSQuestion *q42;
DNSQuestion q6;
DNSQuestion *q62;
} addrinfo;
struct
{
mDNSIPPort ReqExt; // External port we originally requested, for logging purposes
NATTraversalInfo NATinfo;
} pm;
struct
{
#if 0
DNSServiceFlags flags;
#endif
DNSQuestion q_all;
DNSQuestion q_default;
} enumeration;
struct
{
DNSQuestion q;
DNSQuestion *q2;
} queryrecord;
struct
{
DNSQuestion qtxt;
DNSQuestion qsrv;
const ResourceRecord *txt;
const ResourceRecord *srv;
mDNSs32 ReportTime;
mDNSBool external_advertise;
} resolve;
} u;
};
// struct physically sits between ipc message header and call-specific fields in the message buffer
typedef struct
{
DNSServiceFlags flags; // Note: This field is in NETWORK byte order
mDNSu32 ifi; // Note: This field is in NETWORK byte order
DNSServiceErrorType error; // Note: This field is in NETWORK byte order
} reply_hdr;
typedef struct reply_state
{
struct reply_state *next; // If there are multiple unsent replies
mDNSu32 totallen;
mDNSu32 nwriten;
ipc_msg_hdr mhdr[1];
reply_hdr rhdr[1];
} reply_state;
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - Globals
#endif
// globals
mDNSexport mDNS mDNSStorage;
mDNSexport const char ProgramName[] = "mDNSResponder";
static dnssd_sock_t listenfd = dnssd_InvalidSocket;
static request_state *all_requests = NULL;
// Note asymmetry here between registration and browsing.
// For service registrations we only automatically register in domains that explicitly appear in local configuration data
// (so AutoRegistrationDomains could equally well be called SCPrefRegDomains)
// For service browsing we also learn automatic browsing domains from the network, so for that case we have:
// 1. SCPrefBrowseDomains (local configuration data)
// 2. LocalDomainEnumRecords (locally-generated local-only PTR records -- equivalent to slElem->AuthRecs in uDNS.c)
// 3. AutoBrowseDomains, which is populated by tracking add/rmv events in AutomaticBrowseDomainChange, the callback function for our mDNS_GetDomains call.
// By creating and removing our own LocalDomainEnumRecords, we trigger AutomaticBrowseDomainChange callbacks just like domains learned from the network would.
mDNSexport DNameListElem *AutoRegistrationDomains; // Domains where we automatically register for empty-string registrations
static DNameListElem *SCPrefBrowseDomains; // List of automatic browsing domains read from SCPreferences for "empty string" browsing
static ARListElem *LocalDomainEnumRecords; // List of locally-generated PTR records to augment those we learn from the network
mDNSexport DNameListElem *AutoBrowseDomains; // List created from those local-only PTR records plus records we get from the network
#define MSG_PAD_BYTES 5 // pad message buffer (read from client) with n zero'd bytes to guarantee
// n get_string() calls w/o buffer overrun
// initialization, setup/teardown functions
// If a platform specifies its own PID file name, we use that
#ifndef PID_FILE
#define PID_FILE "/var/run/mDNSResponder.pid"
#endif
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - General Utility Functions
#endif
mDNSlocal void FatalError(char *errmsg)
{
LogMsg("%s: %s", errmsg, dnssd_strerror(dnssd_errno));
*(volatile long*)0 = 0; // On OS X abort() doesn't generate a crash log, but writing to zero does
abort(); // On platforms where writing to zero doesn't generate an exception, abort instead
}
mDNSlocal mDNSu32 dnssd_htonl(mDNSu32 l)
{
mDNSu32 ret;
char *data = (char*) &ret;
put_uint32(l, &data);
return ret;
}
// hack to search-replace perror's to LogMsg's
mDNSlocal void my_perror(char *errmsg)
{
LogMsg("%s: %d (%s)", errmsg, dnssd_errno, dnssd_strerror(dnssd_errno));
}
mDNSlocal void abort_request(request_state *req)
{
if (req->terminate == (req_termination_fn)~0)
{ LogMsg("abort_request: ERROR: Attempt to abort operation %p with req->terminate %p", req, req->terminate); return; }
// First stop whatever mDNSCore operation we were doing
// If this is actually a shared connection operation, then its req->terminate function will scan
// the all_requests list and terminate any subbordinate operations sharing this file descriptor
if (req->terminate) req->terminate(req);
if (!dnssd_SocketValid(req->sd))
{ LogMsg("abort_request: ERROR: Attempt to abort operation %p with invalid fd %d", req, req->sd); return; }
// Now, if this request_state is not subordinate to some other primary, close file descriptor and discard replies
if (!req->primary)
{
if (req->errsd != req->sd) LogOperation("%3d: Removing FD and closing errsd %d", req->sd, req->errsd);
else LogOperation("%3d: Removing FD", req->sd);
udsSupportRemoveFDFromEventLoop(req->sd, req->platform_data); // Note: This also closes file descriptor req->sd for us
if (req->errsd != req->sd) { dnssd_close(req->errsd); req->errsd = req->sd; }
while (req->replies) // free pending replies
{
reply_state *ptr = req->replies;
req->replies = req->replies->next;
freeL("reply_state (abort)", ptr);
}
}
// Set req->sd to something invalid, so that udsserver_idle knows to unlink and free this structure
#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
// Don't use dnssd_InvalidSocket (-1) because that's the sentinel value MACOSX_MDNS_MALLOC_DEBUGGING uses
// for detecting when the memory for an object is inadvertently freed while the object is still on some list
req->sd = req->errsd = -2;
#else
req->sd = req->errsd = dnssd_InvalidSocket;
#endif
// We also set req->terminate to a bogus value so we know if abort_request() gets called again for this request
req->terminate = (req_termination_fn)~0;
}
mDNSlocal void AbortUnlinkAndFree(request_state *req)
{
request_state **p = &all_requests;
abort_request(req);
while (*p && *p != req) p=&(*p)->next;
if (*p) { *p = req->next; freeL("request_state/AbortUnlinkAndFree", req); }
else LogMsg("AbortUnlinkAndFree: ERROR: Attempt to abort operation %p not in list", req);
}
mDNSlocal reply_state *create_reply(const reply_op_t op, const size_t datalen, request_state *const request)
{
reply_state *reply;
if ((unsigned)datalen < sizeof(reply_hdr))
{
LogMsg("ERROR: create_reply - data length less than length of required fields");
return NULL;
}
reply = mallocL("reply_state", sizeof(reply_state) + datalen - sizeof(reply_hdr));
if (!reply) FatalError("ERROR: malloc");
reply->next = mDNSNULL;
reply->totallen = (mDNSu32)datalen + sizeof(ipc_msg_hdr);
reply->nwriten = 0;
reply->mhdr->version = VERSION;
reply->mhdr->datalen = (mDNSu32)datalen;
reply->mhdr->ipc_flags = 0;
reply->mhdr->op = op;
reply->mhdr->client_context = request->hdr.client_context;
reply->mhdr->reg_index = 0;
return reply;
}
// Append a reply to the list in a request object
// If our request is sharing a connection, then we append our reply_state onto the primary's list
mDNSlocal void append_reply(request_state *req, reply_state *rep)
{
request_state *r = req->primary ? req->primary : req;
reply_state **ptr = &r->replies;
while (*ptr) ptr = &(*ptr)->next;
*ptr = rep;
rep->next = NULL;
}
// Generates a response message giving name, type, domain, plus interface index,
// suitable for a browse result or service registration result.
// On successful completion rep is set to point to a malloc'd reply_state struct
mDNSlocal mStatus GenerateNTDResponse(const domainname *const servicename, const mDNSInterfaceID id,
request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err)
{
domainlabel name;
domainname type, dom;
*rep = NULL;
if (!DeconstructServiceName(servicename, &name, &type, &dom))
return kDNSServiceErr_Invalid;
else
{
char namestr[MAX_DOMAIN_LABEL+1];
char typestr[MAX_ESCAPED_DOMAIN_NAME];
char domstr [MAX_ESCAPED_DOMAIN_NAME];
int len;
char *data;
ConvertDomainLabelToCString_unescaped(&name, namestr);
ConvertDomainNameToCString(&type, typestr);
ConvertDomainNameToCString(&dom, domstr);
// Calculate reply data length
len = sizeof(DNSServiceFlags);
len += sizeof(mDNSu32); // if index
len += sizeof(DNSServiceErrorType);
len += (int) (strlen(namestr) + 1);
len += (int) (strlen(typestr) + 1);
len += (int) (strlen(domstr) + 1);
// Build reply header
*rep = create_reply(op, len, request);
(*rep)->rhdr->flags = dnssd_htonl(flags);
(*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse));
(*rep)->rhdr->error = dnssd_htonl(err);
// Build reply body
data = (char *)&(*rep)->rhdr[1];
put_string(namestr, &data);
put_string(typestr, &data);
put_string(domstr, &data);
return mStatus_NoError;
}
}
// Special support to enable the DNSServiceBrowse call made by Bonjour Browser
// Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse
mDNSlocal void GenerateBonjourBrowserResponse(const domainname *const servicename, const mDNSInterfaceID id,
request_state *const request, reply_state **const rep, reply_op_t op, DNSServiceFlags flags, mStatus err)
{
char namestr[MAX_DOMAIN_LABEL+1];
char typestr[MAX_ESCAPED_DOMAIN_NAME];
static const char domstr[] = ".";
int len;
char *data;
*rep = NULL;
// 1. Put first label in namestr
ConvertDomainLabelToCString_unescaped((const domainlabel *)servicename, namestr);
// 2. Put second label and "local" into typestr
mDNS_snprintf(typestr, sizeof(typestr), "%#s.local.", SecondLabel(servicename));
// Calculate reply data length
len = sizeof(DNSServiceFlags);
len += sizeof(mDNSu32); // if index
len += sizeof(DNSServiceErrorType);
len += (int) (strlen(namestr) + 1);
len += (int) (strlen(typestr) + 1);
len += (int) (strlen(domstr) + 1);
// Build reply header
*rep = create_reply(op, len, request);
(*rep)->rhdr->flags = dnssd_htonl(flags);
(*rep)->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, id, mDNSfalse));
(*rep)->rhdr->error = dnssd_htonl(err);
// Build reply body
data = (char *)&(*rep)->rhdr[1];
put_string(namestr, &data);
put_string(typestr, &data);
put_string(domstr, &data);
}
// Returns a resource record (allocated w/ malloc) containing the data found in an IPC message
// Data must be in the following format: flags, interfaceIndex, name, rrtype, rrclass, rdlen, rdata, (optional) ttl
// (ttl only extracted/set if ttl argument is non-zero). Returns NULL for a bad-parameter error
mDNSlocal AuthRecord *read_rr_from_ipc_msg(request_state *request, int GetTTL, int validate_flags)
{
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
char name[256];
int str_err = get_string(&request->msgptr, request->msgend, name, sizeof(name));
mDNSu16 type = get_uint16(&request->msgptr, request->msgend);
mDNSu16 class = get_uint16(&request->msgptr, request->msgend);
mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend);
const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen);
mDNSu32 ttl = GetTTL ? get_uint32(&request->msgptr, request->msgend) : 0;
int storage_size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody);
AuthRecord *rr;
mDNSInterfaceID InterfaceID;
AuthRecType artype;
request->flags = flags;
if (str_err) { LogMsg("ERROR: read_rr_from_ipc_msg - get_string"); return NULL; }
if (!request->msgptr) { LogMsg("Error reading Resource Record from client"); return NULL; }
if (validate_flags &&
!((flags & kDNSServiceFlagsShared) == kDNSServiceFlagsShared) &&
!((flags & kDNSServiceFlagsUnique) == kDNSServiceFlagsUnique))
{
LogMsg("ERROR: Bad resource record flags (must be kDNSServiceFlagsShared or kDNSServiceFlagsUnique)");
return NULL;
}
rr = mallocL("AuthRecord/read_rr_from_ipc_msg", sizeof(AuthRecord) - sizeof(RDataBody) + storage_size);
if (!rr) FatalError("ERROR: malloc");
InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
if (InterfaceID == mDNSInterface_LocalOnly)
artype = AuthRecordLocalOnly;
else if (InterfaceID == mDNSInterface_P2P)
artype = AuthRecordP2P;
else if ((InterfaceID == mDNSInterface_Any) && (flags & kDNSServiceFlagsIncludeP2P))
artype = AuthRecordAnyIncludeP2P;
else
artype = AuthRecordAny;
mDNS_SetupResourceRecord(rr, mDNSNULL, InterfaceID, type, 0,
(mDNSu8) ((flags & kDNSServiceFlagsShared) ? kDNSRecordTypeShared : kDNSRecordTypeUnique), artype, mDNSNULL, mDNSNULL);
if (!MakeDomainNameFromDNSNameString(&rr->namestorage, name))
{
LogMsg("ERROR: bad name: %s", name);
freeL("AuthRecord/read_rr_from_ipc_msg", rr);
return NULL;
}
if (flags & kDNSServiceFlagsAllowRemoteQuery) rr->AllowRemoteQuery = mDNStrue;
rr->resrec.rrclass = class;
rr->resrec.rdlength = rdlen;
rr->resrec.rdata->MaxRDLength = rdlen;
mDNSPlatformMemCopy(rr->resrec.rdata->u.data, rdata, rdlen);
if (GetTTL) rr->resrec.rroriginalttl = ttl;
rr->resrec.namehash = DomainNameHashValue(rr->resrec.name);
SetNewRData(&rr->resrec, mDNSNULL, 0); // Sets rr->rdatahash for us
return rr;
}
mDNSlocal int build_domainname_from_strings(domainname *srv, char *name, char *regtype, char *domain)
{
domainlabel n;
domainname d, t;
if (!MakeDomainLabelFromLiteralString(&n, name)) return -1;
if (!MakeDomainNameFromDNSNameString(&t, regtype)) return -1;
if (!MakeDomainNameFromDNSNameString(&d, domain)) return -1;
if (!ConstructServiceName(srv, &n, &t, &d)) return -1;
return 0;
}
mDNSlocal void send_all(dnssd_sock_t s, const char *ptr, int len)
{
int n = send(s, ptr, len, 0);
// On a freshly-created Unix Domain Socket, the kernel should *never* fail to buffer a small write for us
// (four bytes for a typical error code return, 12 bytes for DNSServiceGetProperty(DaemonVersion)).
// If it does fail, we don't attempt to handle this failure, but we do log it so we know something is wrong.
if (n < len)
LogMsg("ERROR: send_all(%d) wrote %d of %d errno %d (%s)",
s, n, len, dnssd_errno, dnssd_strerror(dnssd_errno));
}
#if 0
mDNSlocal mDNSBool AuthorizedDomain(const request_state * const request, const domainname * const d, const DNameListElem * const doms)
{
const DNameListElem *delem = mDNSNULL;
int bestDelta = -1; // the delta of the best match, lower is better
int dLabels = 0;
mDNSBool allow = mDNSfalse;
if (SystemUID(request->uid)) return mDNStrue;
dLabels = CountLabels(d);
for (delem = doms; delem; delem = delem->next)
{
if (delem->uid)
{
int delemLabels = CountLabels(&delem->name);
int delta = dLabels - delemLabels;
if ((bestDelta == -1 || delta <= bestDelta) && SameDomainName(&delem->name, SkipLeadingLabels(d, delta)))
{
bestDelta = delta;
allow = (allow || (delem->uid == request->uid));
}
}
}
return bestDelta == -1 ? mDNStrue : allow;
}
#endif
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - external helpers
#endif
mDNSlocal void external_start_advertising_helper(service_instance *const instance)
{
AuthRecord *st = instance->subtypes;
ExtraResourceRecord *e;
int i;
if (mDNSIPPortIsZero(instance->request->u.servicereg.port))
{
LogInfo("external_start_advertising_helper: Not registering service with port number zero");
return;
}
#if APPLE_OSX_mDNSResponder
// Update packet filter if p2p interface already exists, otherwise,
// if will be updated when we get the KEV_DL_IF_ATTACHED event for
// the interface. Called here since we don't call external_start_advertising_service()
// with the SRV record when advertising a service.
mDNSInitPacketFilter();
#endif // APPLE_OSX_mDNSResponder
if (instance->external_advertise) LogMsg("external_start_advertising_helper: external_advertise already set!");
for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++)
external_start_advertising_service(&st[i].resrec);
external_start_advertising_service(&instance->srs.RR_PTR.resrec);
external_start_advertising_service(&instance->srs.RR_TXT.resrec);
for (e = instance->srs.Extras; e; e = e->next)
external_start_advertising_service(&e->r.resrec);
instance->external_advertise = mDNStrue;
}
mDNSlocal void external_stop_advertising_helper(service_instance *const instance)
{
AuthRecord *st = instance->subtypes;
ExtraResourceRecord *e;
int i;
if (!instance->external_advertise) return;
LogInfo("external_stop_advertising_helper: calling external_stop_advertising_service");
for ( i = 0; i < instance->request->u.servicereg.num_subtypes; i++)
external_stop_advertising_service(&st[i].resrec);
external_stop_advertising_service(&instance->srs.RR_PTR.resrec);
external_stop_advertising_service(&instance->srs.RR_TXT.resrec);
for (e = instance->srs.Extras; e; e = e->next)
external_stop_advertising_service(&e->r.resrec);
instance->external_advertise = mDNSfalse;
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceRegister
#endif
mDNSexport void FreeExtraRR(mDNS *const m, AuthRecord *const rr, mStatus result)
{
ExtraResourceRecord *extra = (ExtraResourceRecord *)rr->RecordContext;
(void)m; // Unused
if (result != mStatus_MemFree) { LogMsg("Error: FreeExtraRR invoked with unexpected error %d", result); return; }
LogInfo(" FreeExtraRR %s", RRDisplayString(m, &rr->resrec));
if (rr->resrec.rdata != &rr->rdatastorage)
freeL("Extra RData", rr->resrec.rdata);
freeL("ExtraResourceRecord/FreeExtraRR", extra);
}
mDNSlocal void unlink_and_free_service_instance(service_instance *srv)
{
ExtraResourceRecord *e = srv->srs.Extras, *tmp;
external_stop_advertising_helper(srv);
// clear pointers from parent struct
if (srv->request)
{
service_instance **p = &srv->request->u.servicereg.instances;
while (*p)
{
if (*p == srv) { *p = (*p)->next; break; }
p = &(*p)->next;
}
}
while (e)
{
e->r.RecordContext = e;
tmp = e;
e = e->next;
FreeExtraRR(&mDNSStorage, &tmp->r, mStatus_MemFree);
}
if (srv->srs.RR_TXT.resrec.rdata != &srv->srs.RR_TXT.rdatastorage)
freeL("TXT RData", srv->srs.RR_TXT.resrec.rdata);
if (srv->subtypes) { freeL("ServiceSubTypes", srv->subtypes); srv->subtypes = NULL; }
freeL("service_instance", srv);
}
// Count how many other service records we have locally with the same name, but different rdata.
// For auto-named services, we can have at most one per machine -- if we allowed two auto-named services of
// the same type on the same machine, we'd get into an infinite autoimmune-response loop of continuous renaming.
mDNSexport int CountPeerRegistrations(mDNS *const m, ServiceRecordSet *const srs)
{
int count = 0;
ResourceRecord *r = &srs->RR_SRV.resrec;
AuthRecord *rr;
for (rr = m->ResourceRecords; rr; rr=rr->next)
if (rr->resrec.rrtype == kDNSType_SRV && SameDomainName(rr->resrec.name, r->name) && !IdenticalSameNameRecord(&rr->resrec, r))
count++;
verbosedebugf("%d peer registrations for %##s", count, r->name->c);
return(count);
}
mDNSexport int CountExistingRegistrations(domainname *srv, mDNSIPPort port)
{
int count = 0;
AuthRecord *rr;
for (rr = mDNSStorage.ResourceRecords; rr; rr=rr->next)
if (rr->resrec.rrtype == kDNSType_SRV &&
mDNSSameIPPort(rr->resrec.rdata->u.srv.port, port) &&
SameDomainName(rr->resrec.name, srv))
count++;
return(count);
}
mDNSlocal void SendServiceRemovalNotification(ServiceRecordSet *const srs)
{
reply_state *rep;
service_instance *instance = srs->ServiceContext;
if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, 0, mStatus_NoError) != mStatus_NoError)
LogMsg("%3d: SendServiceRemovalNotification: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
else { append_reply(instance->request, rep); instance->clientnotified = mDNSfalse; }
}
// service registration callback performs three duties - frees memory for deregistered services,
// handles name conflicts, and delivers completed registration information to the client
mDNSlocal void regservice_callback(mDNS *const m, ServiceRecordSet *const srs, mStatus result)
{
mStatus err;
mDNSBool SuppressError = mDNSfalse;
service_instance *instance;
reply_state *rep;
(void)m; // Unused
if (!srs) { LogMsg("regservice_callback: srs is NULL %d", result); return; }
instance = srs->ServiceContext;
if (!instance) { LogMsg("regservice_callback: srs->ServiceContext is NULL %d", result); return; }
// don't send errors up to client for wide-area, empty-string registrations
if (instance->request &&
instance->request->u.servicereg.default_domain &&
!instance->default_local)
SuppressError = mDNStrue;
if (mDNS_LoggingEnabled)
{
const char *const fmt =
(result == mStatus_NoError) ? "%s DNSServiceRegister(%##s, %u) REGISTERED" :
(result == mStatus_MemFree) ? "%s DNSServiceRegister(%##s, %u) DEREGISTERED" :
(result == mStatus_NameConflict) ? "%s DNSServiceRegister(%##s, %u) NAME CONFLICT" :
"%s DNSServiceRegister(%##s, %u) %s %d";
char prefix[16] = "---:";
if (instance->request) mDNS_snprintf(prefix, sizeof(prefix), "%3d:", instance->request->sd);
LogOperation(fmt, prefix, srs->RR_SRV.resrec.name->c, mDNSVal16(srs->RR_SRV.resrec.rdata->u.srv.port),
SuppressError ? "suppressed error" : "CALLBACK", result);
}
if (!instance->request && result != mStatus_MemFree) { LogMsg("regservice_callback: instance->request is NULL %d", result); return; }
if (result == mStatus_NoError)
{
if (instance->request->u.servicereg.allowremotequery)
{
ExtraResourceRecord *e;
srs->RR_ADV.AllowRemoteQuery = mDNStrue;
srs->RR_PTR.AllowRemoteQuery = mDNStrue;
srs->RR_SRV.AllowRemoteQuery = mDNStrue;
srs->RR_TXT.AllowRemoteQuery = mDNStrue;
for (e = instance->srs.Extras; e; e = e->next) e->r.AllowRemoteQuery = mDNStrue;
}
if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError)
LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; }
if (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P)))
{
LogInfo("regservice_callback: calling external_start_advertising_helper()");
external_start_advertising_helper(instance);
}
if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0)
RecordUpdatedNiceLabel(m, 0); // Successfully got new name, tell user immediately
}
else if (result == mStatus_MemFree)
{
if (instance->request && instance->renameonmemfree)
{
external_stop_advertising_helper(instance);
instance->renameonmemfree = 0;
err = mDNS_RenameAndReregisterService(m, srs, &instance->request->u.servicereg.name);
if (err) LogMsg("ERROR: regservice_callback - RenameAndReregisterService returned %d", err);
// error should never happen - safest to log and continue
}
else
unlink_and_free_service_instance(instance);
}
else if (result == mStatus_NameConflict)
{
if (instance->request->u.servicereg.autorename)
{
external_stop_advertising_helper(instance);
if (instance->request->u.servicereg.autoname && CountPeerRegistrations(m, srs) == 0)
{
// On conflict for an autoname service, rename and reregister *all* autoname services
IncrementLabelSuffix(&m->nicelabel, mDNStrue);
mDNS_ConfigChanged(m); // Will call back into udsserver_handle_configchange()
}
else // On conflict for a non-autoname service, rename and reregister just that one service
{
if (instance->clientnotified) SendServiceRemovalNotification(srs);
mDNS_RenameAndReregisterService(m, srs, mDNSNULL);
}
}
else
{
if (!SuppressError)
{
if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError)
LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; }
}
unlink_and_free_service_instance(instance);
}
}
else // Not mStatus_NoError, mStatus_MemFree, or mStatus_NameConflict
{
if (!SuppressError)
{
if (GenerateNTDResponse(srs->RR_SRV.resrec.name, srs->RR_SRV.resrec.InterfaceID, instance->request, &rep, reg_service_reply_op, kDNSServiceFlagsAdd, result) != mStatus_NoError)
LogMsg("%3d: regservice_callback: %##s is not valid DNS-SD SRV name", instance->request->sd, srs->RR_SRV.resrec.name->c);
else { append_reply(instance->request, rep); instance->clientnotified = mDNStrue; }
}
}
}
mDNSlocal void regrecord_callback(mDNS *const m, AuthRecord *rr, mStatus result)
{
(void)m; // Unused
if (!rr->RecordContext) // parent struct already freed by termination callback
{
if (result == mStatus_NoError)
LogMsg("Error: regrecord_callback: successful registration of orphaned record %s", ARDisplayString(m, rr));
else
{
if (result != mStatus_MemFree) LogMsg("regrecord_callback: error %d received after parent termination", result);
// We come here when the record is being deregistered either from DNSServiceRemoveRecord or connection_termination.
// If the record has been updated, we need to free the rdata. Everytime we call mDNS_Update, it calls update_callback
// with the old rdata (so that we can free it) and stores the new rdata in "rr->resrec.rdata". This means, we need
// to free the latest rdata for which the update_callback was never called with.
if (rr->resrec.rdata != &rr->rdatastorage) freeL("RData/regrecord_callback", rr->resrec.rdata);
freeL("AuthRecord/regrecord_callback", rr);
}
}
else
{
registered_record_entry *re = rr->RecordContext;
request_state *request = re->request;
if (mDNS_LoggingEnabled)
{
char *fmt = (result == mStatus_NoError) ? "%3d: DNSServiceRegisterRecord(%u %s) REGISTERED" :
(result == mStatus_MemFree) ? "%3d: DNSServiceRegisterRecord(%u %s) DEREGISTERED" :
(result == mStatus_NameConflict) ? "%3d: DNSServiceRegisterRecord(%u %s) NAME CONFLICT" :
"%3d: DNSServiceRegisterRecord(%u %s) %d";
LogOperation(fmt, request->sd, re->key, RRDisplayString(m, &rr->resrec), result);
}
if (result != mStatus_MemFree)
{
int len = sizeof(DNSServiceFlags) + sizeof(mDNSu32) + sizeof(DNSServiceErrorType);
reply_state *reply = create_reply(reg_record_reply_op, len, request);
reply->mhdr->client_context = re->regrec_client_context;
reply->rhdr->flags = dnssd_htonl(0);
reply->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, rr->resrec.InterfaceID, mDNSfalse));
reply->rhdr->error = dnssd_htonl(result);
append_reply(request, reply);
}
if (result)
{
// unlink from list, free memory
registered_record_entry **ptr = &request->u.reg_recs;
while (*ptr && (*ptr) != re) ptr = &(*ptr)->next;
if (!*ptr) { LogMsg("regrecord_callback - record not in list!"); return; }
*ptr = (*ptr)->next;
freeL("registered_record_entry AuthRecord regrecord_callback", re->rr);
freeL("registered_record_entry regrecord_callback", re);
}
else
{
if (re->external_advertise) LogMsg("regrecord_callback: external_advertise already set!");
if (re->origInterfaceID == mDNSInterface_P2P || (!re->origInterfaceID && IsLocalDomain(&rr->namestorage) && (request->flags & kDNSServiceFlagsIncludeP2P)))
{
LogInfo("regrecord_callback: calling external_start_advertising_service");
external_start_advertising_service(&rr->resrec);
re->external_advertise = mDNStrue;
}
}
}
}
mDNSlocal void connection_termination(request_state *request)
{
// When terminating a shared connection, we need to scan the all_requests list
// and terminate any subbordinate operations sharing this file descriptor
request_state **req = &all_requests;
LogOperation("%3d: DNSServiceCreateConnection STOP", request->sd);
while (*req)
{
if ((*req)->primary == request)
{
// Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree()
request_state *tmp = *req;
if (tmp->primary == tmp) LogMsg("connection_termination ERROR (*req)->primary == *req for %p %d", tmp, tmp->sd);
if (tmp->replies) LogMsg("connection_termination ERROR How can subordinate req %p %d have replies queued?", tmp, tmp->sd);
abort_request(tmp);
*req = tmp->next;
freeL("request_state/connection_termination", tmp);
}
else
req = &(*req)->next;
}
while (request->u.reg_recs)
{
registered_record_entry *ptr = request->u.reg_recs;
LogOperation("%3d: DNSServiceRegisterRecord(%u %s) STOP", request->sd, ptr->key, RRDisplayString(&mDNSStorage, &ptr->rr->resrec));
request->u.reg_recs = request->u.reg_recs->next;
ptr->rr->RecordContext = NULL;
if (ptr->external_advertise)
{
ptr->external_advertise = mDNSfalse;
external_stop_advertising_service(&ptr->rr->resrec);
}
mDNS_Deregister(&mDNSStorage, ptr->rr); // Will free ptr->rr for us
freeL("registered_record_entry/connection_termination", ptr);
}
}
mDNSlocal void handle_cancel_request(request_state *request)
{
request_state **req = &all_requests;
LogOperation("%3d: Cancel %08X %08X", request->sd, request->hdr.client_context.u32[1], request->hdr.client_context.u32[0]);
while (*req)
{
if ((*req)->primary == request &&
(*req)->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] &&
(*req)->hdr.client_context.u32[1] == request->hdr.client_context.u32[1])
{
// Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree()
request_state *tmp = *req;
abort_request(tmp);
*req = tmp->next;
freeL("request_state/handle_cancel_request", tmp);
}
else
req = &(*req)->next;
}
}
mDNSlocal mStatus handle_regrecord_request(request_state *request)
{
mStatus err = mStatus_BadParamErr;
AuthRecord *rr = read_rr_from_ipc_msg(request, 1, 1);
if (rr)
{
registered_record_entry *re;
// Don't allow non-local domains to be regsitered as LocalOnly. Allowing this would permit
// clients to register records such as www.bigbank.com A w.x.y.z to redirect Safari.
if (rr->resrec.InterfaceID == mDNSInterface_LocalOnly && !IsLocalDomain(rr->resrec.name) &&
rr->resrec.rrclass == kDNSClass_IN && (rr->resrec.rrtype == kDNSType_A || rr->resrec.rrtype == kDNSType_AAAA ||
rr->resrec.rrtype == kDNSType_CNAME))
{
freeL("AuthRecord/handle_regrecord_request", rr);
return (mStatus_BadParamErr);
}
// allocate registration entry, link into list
re = mallocL("registered_record_entry", sizeof(registered_record_entry));
if (!re) FatalError("ERROR: malloc");
re->key = request->hdr.reg_index;
re->rr = rr;
re->regrec_client_context = request->hdr.client_context;
re->request = request;
re->external_advertise = mDNSfalse;
rr->RecordContext = re;
rr->RecordCallback = regrecord_callback;
re->origInterfaceID = rr->resrec.InterfaceID;
if (rr->resrec.InterfaceID == mDNSInterface_P2P) rr->resrec.InterfaceID = mDNSInterface_Any;
#if 0
if (!AuthorizedDomain(request, rr->resrec.name, AutoRegistrationDomains)) return (mStatus_NoError);
#endif
if (rr->resrec.rroriginalttl == 0)
rr->resrec.rroriginalttl = DefaultTTLforRRType(rr->resrec.rrtype);
LogOperation("%3d: DNSServiceRegisterRecord(%u %s) START", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec));
err = mDNS_Register(&mDNSStorage, rr);
if (err)
{
LogOperation("%3d: DNSServiceRegisterRecord(%u %s) ERROR (%d)", request->sd, re->key, RRDisplayString(&mDNSStorage, &rr->resrec), err);
freeL("registered_record_entry", re);
freeL("registered_record_entry/AuthRecord", rr);
}
else
{
re->next = request->u.reg_recs;
request->u.reg_recs = re;
}
}
return(err);
}
mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m);
mDNSlocal void regservice_termination_callback(request_state *request)
{
if (!request) { LogMsg("regservice_termination_callback context is NULL"); return; }
while (request->u.servicereg.instances)
{
service_instance *p = request->u.servicereg.instances;
request->u.servicereg.instances = request->u.servicereg.instances->next;
// only safe to free memory if registration is not valid, i.e. deregister fails (which invalidates p)
LogOperation("%3d: DNSServiceRegister(%##s, %u) STOP",
request->sd, p->srs.RR_SRV.resrec.name->c, mDNSVal16(p->srs.RR_SRV.resrec.rdata->u.srv.port));
external_stop_advertising_helper(p);
// Clear backpointer *before* calling mDNS_DeregisterService/unlink_and_free_service_instance
// We don't need unlink_and_free_service_instance to cut its element from the list, because we're already advancing
// request->u.servicereg.instances as we work our way through the list, implicitly cutting one element at a time
// We can't clear p->request *after* the calling mDNS_DeregisterService/unlink_and_free_service_instance
// because by then we might have already freed p
p->request = NULL;
if (mDNS_DeregisterService(&mDNSStorage, &p->srs)) unlink_and_free_service_instance(p);
// Don't touch service_instance *p after this -- it's likely to have been freed already
}
if (request->u.servicereg.txtdata)
{ freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; }
if (request->u.servicereg.autoname)
{
// Clear autoname before calling UpdateDeviceInfoRecord() so it doesn't mistakenly include this in its count of active autoname registrations
request->u.servicereg.autoname = mDNSfalse;
UpdateDeviceInfoRecord(&mDNSStorage);
}
}
mDNSlocal request_state *LocateSubordinateRequest(request_state *request)
{
request_state *req;
for (req = all_requests; req; req = req->next)
if (req->primary == request &&
req->hdr.client_context.u32[0] == request->hdr.client_context.u32[0] &&
req->hdr.client_context.u32[1] == request->hdr.client_context.u32[1]) return(req);
return(request);
}
mDNSlocal mStatus add_record_to_service(request_state *request, service_instance *instance, mDNSu16 rrtype, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl)
{
ServiceRecordSet *srs = &instance->srs;
mStatus result;
int size = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody);
ExtraResourceRecord *extra = mallocL("ExtraResourceRecord", sizeof(*extra) - sizeof(RDataBody) + size);
if (!extra) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; }
mDNSPlatformMemZero(extra, sizeof(ExtraResourceRecord)); // OK if oversized rdata not zero'd
extra->r.resrec.rrtype = rrtype;
extra->r.rdatastorage.MaxRDLength = (mDNSu16) size;
extra->r.resrec.rdlength = rdlen;
mDNSPlatformMemCopy(&extra->r.rdatastorage.u.data, rdata, rdlen);
result = mDNS_AddRecordToService(&mDNSStorage, srs, extra, &extra->r.rdatastorage, ttl,
(request->flags & kDNSServiceFlagsIncludeP2P) ? 1: 0);
if (result) { freeL("ExtraResourceRecord/add_record_to_service", extra); return result; }
extra->ClientID = request->hdr.reg_index;
if (instance->external_advertise && (instance->request->u.servicereg.InterfaceID == mDNSInterface_P2P || (!instance->request->u.servicereg.InterfaceID && SameDomainName(&instance->domain, &localdomain) && (instance->request->flags & kDNSServiceFlagsIncludeP2P))))
{
LogInfo("add_record_to_service: calling external_start_advertising_service");
external_start_advertising_service(&extra->r.resrec);
}
return result;
}
mDNSlocal mStatus handle_add_request(request_state *request)
{
service_instance *i;
mStatus result = mStatus_UnknownErr;
DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend);
mDNSu16 rrtype = get_uint16(&request->msgptr, request->msgend);
mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend);
const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen);
mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend);
if (!ttl) ttl = DefaultTTLforRRType(rrtype);
(void)flags; // Unused
if (!request->msgptr) { LogMsg("%3d: DNSServiceAddRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
// If this is a shared connection, check if the operation actually applies to a subordinate request_state object
if (request->terminate == connection_termination) request = LocateSubordinateRequest(request);
if (request->terminate != regservice_termination_callback)
{ LogMsg("%3d: DNSServiceAddRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); }
// For a service registered with zero port, don't allow adding records. This mostly happens due to a bug
// in the application. See radar://9165807.
if (mDNSIPPortIsZero(request->u.servicereg.port))
{ LogMsg("%3d: DNSServiceAddRecord: adding record to a service registered with zero port", request->sd); return(mStatus_BadParamErr); }
LogOperation("%3d: DNSServiceAddRecord(%X, %##s, %s, %d)", request->sd, flags,
(request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL, DNSTypeName(rrtype), rdlen);
for (i = request->u.servicereg.instances; i; i = i->next)
{
result = add_record_to_service(request, i, rrtype, rdlen, rdata, ttl);
if (result && i->default_local) break;
else result = mStatus_NoError; // suppress non-local default errors
}
return(result);
}
mDNSlocal void update_callback(mDNS *const m, AuthRecord *const rr, RData *oldrd, mDNSu16 oldrdlen)
{
mDNSBool external_advertise = (rr->UpdateContext) ? *((mDNSBool *)rr->UpdateContext) : mDNSfalse;
(void)m; // Unused
// There are three cases.
//
// 1. We have updated the primary TXT record of the service
// 2. We have updated the TXT record that was added to the service using DNSServiceAddRecord
// 3. We have updated the TXT record that was registered using DNSServiceRegisterRecord
//
// external_advertise is set if we have advertised at least once during the initial addition
// of the record in all of the three cases above. We should have checked for InterfaceID/LocalDomain
// checks during the first time and hence we don't do any checks here
if (external_advertise)
{
ResourceRecord ext = rr->resrec;
if (ext.rdlength == oldrdlen && mDNSPlatformMemSame(&ext.rdata->u, &oldrd->u, oldrdlen)) goto exit;
SetNewRData(&ext, oldrd, oldrdlen);
external_stop_advertising_service(&ext);
LogInfo("update_callback: calling external_start_advertising_service");
external_start_advertising_service(&rr->resrec);
}
exit:
if (oldrd != &rr->rdatastorage) freeL("RData/update_callback", oldrd);
}
mDNSlocal mStatus update_record(AuthRecord *rr, mDNSu16 rdlen, const char *rdata, mDNSu32 ttl, const mDNSBool *const external_advertise)
{
mStatus result;
const int rdsize = rdlen > sizeof(RDataBody) ? rdlen : sizeof(RDataBody);
RData *newrd = mallocL("RData/update_record", sizeof(RData) - sizeof(RDataBody) + rdsize);
if (!newrd) FatalError("ERROR: malloc");
newrd->MaxRDLength = (mDNSu16) rdsize;
mDNSPlatformMemCopy(&newrd->u, rdata, rdlen);
// BIND named (name daemon) doesn't allow TXT records with zero-length rdata. This is strictly speaking correct,
// since RFC 1035 specifies a TXT record as "One or more <character-string>s", not "Zero or more <character-string>s".
// Since some legacy apps try to create zero-length TXT records, we'll silently correct it here.
if (rr->resrec.rrtype == kDNSType_TXT && rdlen == 0) { rdlen = 1; newrd->u.txt.c[0] = 0; }
if (external_advertise) rr->UpdateContext = (void *)external_advertise;
result = mDNS_Update(&mDNSStorage, rr, ttl, rdlen, newrd, update_callback);
if (result) { LogMsg("update_record: Error %d for %s", (int)result, ARDisplayString(&mDNSStorage, rr)); freeL("RData/update_record", newrd); }
return result;
}
mDNSlocal mStatus handle_update_request(request_state *request)
{
const ipc_msg_hdr *const hdr = &request->hdr;
mStatus result = mStatus_BadReferenceErr;
service_instance *i;
AuthRecord *rr = NULL;
// get the message data
DNSServiceFlags flags = get_flags (&request->msgptr, request->msgend); // flags unused
mDNSu16 rdlen = get_uint16(&request->msgptr, request->msgend);
const char *rdata = get_rdata (&request->msgptr, request->msgend, rdlen);
mDNSu32 ttl = get_uint32(&request->msgptr, request->msgend);
(void)flags; // Unused
if (!request->msgptr) { LogMsg("%3d: DNSServiceUpdateRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
// If this is a shared connection, check if the operation actually applies to a subordinate request_state object
if (request->terminate == connection_termination) request = LocateSubordinateRequest(request);
if (request->terminate == connection_termination)
{
// update an individually registered record
registered_record_entry *reptr;
for (reptr = request->u.reg_recs; reptr; reptr = reptr->next)
{
if (reptr->key == hdr->reg_index)
{
result = update_record(reptr->rr, rdlen, rdata, ttl, &reptr->external_advertise);
LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)",
request->sd, reptr->rr->resrec.name->c, reptr->rr ? DNSTypeName(reptr->rr->resrec.rrtype) : "<NONE>");
goto end;
}
}
result = mStatus_BadReferenceErr;
goto end;
}
if (request->terminate != regservice_termination_callback)
{ LogMsg("%3d: DNSServiceUpdateRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); }
// For a service registered with zero port, only SRV record is initialized. Don't allow any updates.
if (mDNSIPPortIsZero(request->u.servicereg.port))
{ LogMsg("%3d: DNSServiceUpdateRecord: updating the record of a service registered with zero port", request->sd); return(mStatus_BadParamErr); }
// update the saved off TXT data for the service
if (hdr->reg_index == TXT_RECORD_INDEX)
{
if (request->u.servicereg.txtdata)
{ freeL("service_info txtdata", request->u.servicereg.txtdata); request->u.servicereg.txtdata = NULL; }
if (rdlen > 0)
{
request->u.servicereg.txtdata = mallocL("service_info txtdata", rdlen);
if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_update_request - malloc");
mDNSPlatformMemCopy(request->u.servicereg.txtdata, rdata, rdlen);
}
request->u.servicereg.txtlen = rdlen;
}
// update a record from a service record set
for (i = request->u.servicereg.instances; i; i = i->next)
{
if (hdr->reg_index == TXT_RECORD_INDEX) rr = &i->srs.RR_TXT;
else
{
ExtraResourceRecord *e;
for (e = i->srs.Extras; e; e = e->next)
if (e->ClientID == hdr->reg_index) { rr = &e->r; break; }
}
if (!rr) { result = mStatus_BadReferenceErr; goto end; }
result = update_record(rr, rdlen, rdata, ttl, &i->external_advertise);
if (result && i->default_local) goto end;
else result = mStatus_NoError; // suppress non-local default errors
}
end:
if (request->terminate == regservice_termination_callback)
LogOperation("%3d: DNSServiceUpdateRecord(%##s, %s)", request->sd,
(request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL,
rr ? DNSTypeName(rr->resrec.rrtype) : "<NONE>");
return(result);
}
// remove a resource record registered via DNSServiceRegisterRecord()
mDNSlocal mStatus remove_record(request_state *request)
{
mStatus err = mStatus_UnknownErr;
registered_record_entry *e, **ptr = &request->u.reg_recs;
while (*ptr && (*ptr)->key != request->hdr.reg_index) ptr = &(*ptr)->next;
if (!*ptr) { LogMsg("%3d: DNSServiceRemoveRecord(%u) not found", request->sd, request->hdr.reg_index); return mStatus_BadReferenceErr; }
e = *ptr;
*ptr = e->next; // unlink
LogOperation("%3d: DNSServiceRemoveRecord(%u %s)", request->sd, e->key, RRDisplayString(&mDNSStorage, &e->rr->resrec));
e->rr->RecordContext = NULL;
if (e->external_advertise)
{
external_stop_advertising_service(&e->rr->resrec);
e->external_advertise = mDNSfalse;
}
err = mDNS_Deregister(&mDNSStorage, e->rr); // Will free e->rr for us; we're responsible for freeing e
if (err)
{
LogMsg("ERROR: remove_record, mDNS_Deregister: %d", err);
freeL("registered_record_entry AuthRecord remove_record", e->rr);
}
freeL("registered_record_entry remove_record", e);
return err;
}
mDNSlocal mStatus remove_extra(const request_state *const request, service_instance *const serv, mDNSu16 *const rrtype)
{
mStatus err = mStatus_BadReferenceErr;
ExtraResourceRecord *ptr;
for (ptr = serv->srs.Extras; ptr; ptr = ptr->next)
{
if (ptr->ClientID == request->hdr.reg_index) // found match
{
*rrtype = ptr->r.resrec.rrtype;
if (serv->external_advertise) external_stop_advertising_service(&ptr->r.resrec);
err = mDNS_RemoveRecordFromService(&mDNSStorage, &serv->srs, ptr, FreeExtraRR, ptr);
break;
}
}
return err;
}
mDNSlocal mStatus handle_removerecord_request(request_state *request)
{
mStatus err = mStatus_BadReferenceErr;
get_flags(&request->msgptr, request->msgend); // flags unused
if (!request->msgptr) { LogMsg("%3d: DNSServiceRemoveRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
// If this is a shared connection, check if the operation actually applies to a subordinate request_state object
if (request->terminate == connection_termination) request = LocateSubordinateRequest(request);
if (request->terminate == connection_termination)
err = remove_record(request); // remove individually registered record
else if (request->terminate != regservice_termination_callback)
{ LogMsg("%3d: DNSServiceRemoveRecord(not a registered service ref)", request->sd); return(mStatus_BadParamErr); }
else
{
service_instance *i;
mDNSu16 rrtype = 0;
LogOperation("%3d: DNSServiceRemoveRecord(%##s, %s)", request->sd,
(request->u.servicereg.instances) ? request->u.servicereg.instances->srs.RR_SRV.resrec.name->c : NULL,
rrtype ? DNSTypeName(rrtype) : "<NONE>");
for (i = request->u.servicereg.instances; i; i = i->next)
{
err = remove_extra(request, i, &rrtype);
if (err && i->default_local) break;
else err = mStatus_NoError; // suppress non-local default errors
}
}
return(err);
}
// If there's a comma followed by another character,
// FindFirstSubType overwrites the comma with a nul and returns the pointer to the next character.
// Otherwise, it returns a pointer to the final nul at the end of the string
mDNSlocal char *FindFirstSubType(char *p)
{
while (*p)
{
if (p[0] == '\\' && p[1]) p += 2;
else if (p[0] == ',' && p[1]) { *p++ = 0; return(p); }
else p++;
}
return(p);
}
// If there's a comma followed by another character,
// FindNextSubType overwrites the comma with a nul and returns the pointer to the next character.
// If it finds an illegal unescaped dot in the subtype name, it returns mDNSNULL
// Otherwise, it returns a pointer to the final nul at the end of the string
mDNSlocal char *FindNextSubType(char *p)
{
while (*p)
{
if (p[0] == '\\' && p[1]) // If escape character
p += 2; // ignore following character
else if (p[0] == ',') // If we found a comma
{
if (p[1]) *p++ = 0;
return(p);
}
else if (p[0] == '.')
return(mDNSNULL);
else p++;
}
return(p);
}
// Returns -1 if illegal subtype found
mDNSexport mDNSs32 ChopSubTypes(char *regtype)
{
mDNSs32 NumSubTypes = 0;
char *stp = FindFirstSubType(regtype);
while (stp && *stp) // If we found a comma...
{
if (*stp == ',') return(-1);
NumSubTypes++;
stp = FindNextSubType(stp);
}
if (!stp) return(-1);
return(NumSubTypes);
}
mDNSexport AuthRecord *AllocateSubTypes(mDNSs32 NumSubTypes, char *p)
{
AuthRecord *st = mDNSNULL;
if (NumSubTypes)
{
mDNSs32 i;
st = mallocL("ServiceSubTypes", NumSubTypes * sizeof(AuthRecord));
if (!st) return(mDNSNULL);
for (i = 0; i < NumSubTypes; i++)
{
mDNS_SetupResourceRecord(&st[i], mDNSNULL, mDNSInterface_Any, kDNSQType_ANY, kStandardTTL, 0, AuthRecordAny, mDNSNULL, mDNSNULL);
while (*p) p++;
p++;
if (!MakeDomainNameFromDNSNameString(&st[i].namestorage, p))
{ freeL("ServiceSubTypes", st); return(mDNSNULL); }
}
}
return(st);
}
mDNSlocal mStatus register_service_instance(request_state *request, const domainname *domain)
{
service_instance **ptr, *instance;
const int extra_size = (request->u.servicereg.txtlen > sizeof(RDataBody)) ? (request->u.servicereg.txtlen - sizeof(RDataBody)) : 0;
const mDNSBool DomainIsLocal = SameDomainName(domain, &localdomain);
mStatus result;
mDNSInterfaceID interfaceID = request->u.servicereg.InterfaceID;
mDNSu32 regFlags = 0;
if (interfaceID == mDNSInterface_P2P)
{
interfaceID = mDNSInterface_Any;
regFlags |= regFlagIncludeP2P;
}
else if (request->flags & kDNSServiceFlagsIncludeP2P)
regFlags |= regFlagIncludeP2P;
// client guarantees that record names are unique
if (request->flags & kDNSServiceFlagsForce)
regFlags |= regFlagKnownUnique;
// If the client specified an interface, but no domain, then we honor the specified interface for the "local" (mDNS)
// registration but for the wide-area registrations we don't (currently) have any concept of a wide-area unicast
// registrations scoped to a specific interface, so for the automatic domains we add we must *not* specify an interface.
// (Specifying an interface with an apparently wide-area domain (i.e. something other than "local")
// currently forces the registration to use mDNS multicast despite the apparently wide-area domain.)
if (request->u.servicereg.default_domain && !DomainIsLocal) interfaceID = mDNSInterface_Any;
for (ptr = &request->u.servicereg.instances; *ptr; ptr = &(*ptr)->next)
{
if (SameDomainName(&(*ptr)->domain, domain))
{
LogMsg("register_service_instance: domain %##s already registered for %#s.%##s",
domain->c, &request->u.servicereg.name, &request->u.servicereg.type);
return mStatus_AlreadyRegistered;
}
}
if (mDNSStorage.KnownBugs & mDNS_KnownBug_LimitedIPv6)
{
// Special-case hack: On Mac OS X 10.6.x and earlier we don't advertise SMB service in AutoTunnel domains,
// because AutoTunnel services have to support IPv6, and in Mac OS X 10.6.x the SMB server does not.
// <rdar://problem/5482322> BTMM: Don't advertise SMB with BTMM because it doesn't support IPv6
if (SameDomainName(&request->u.servicereg.type, (const domainname *) "\x4" "_smb" "\x4" "_tcp"))
{
DomainAuthInfo *AuthInfo = GetAuthInfoForName(&mDNSStorage, domain);
if (AuthInfo && AuthInfo->AutoTunnel) return(kDNSServiceErr_Unsupported);
}
}
instance = mallocL("service_instance", sizeof(*instance) + extra_size);
if (!instance) { my_perror("ERROR: malloc"); return mStatus_NoMemoryErr; }
instance->next = mDNSNULL;
instance->request = request;
instance->subtypes = AllocateSubTypes(request->u.servicereg.num_subtypes, request->u.servicereg.type_as_string);
instance->renameonmemfree = 0;
instance->clientnotified = mDNSfalse;
instance->default_local = (request->u.servicereg.default_domain && DomainIsLocal);
instance->external_advertise = mDNSfalse;
AssignDomainName(&instance->domain, domain);
if (request->u.servicereg.num_subtypes && !instance->subtypes)
{ unlink_and_free_service_instance(instance); instance = NULL; FatalError("ERROR: malloc"); }
result = mDNS_RegisterService(&mDNSStorage, &instance->srs,
&request->u.servicereg.name, &request->u.servicereg.type, domain,
request->u.servicereg.host.c[0] ? &request->u.servicereg.host : NULL,
request->u.servicereg.port,
request->u.servicereg.txtdata, request->u.servicereg.txtlen,
instance->subtypes, request->u.servicereg.num_subtypes,
interfaceID, regservice_callback, instance, regFlags);
if (!result)
{
*ptr = instance; // Append this to the end of our request->u.servicereg.instances list
LogOperation("%3d: DNSServiceRegister(%##s, %u) ADDED",
instance->request->sd, instance->srs.RR_SRV.resrec.name->c, mDNSVal16(request->u.servicereg.port));
}
else
{
LogMsg("register_service_instance %#s.%##s%##s error %d",
&request->u.servicereg.name, &request->u.servicereg.type, domain->c, result);
unlink_and_free_service_instance(instance);
}
return result;
}
mDNSlocal void udsserver_default_reg_domain_changed(const DNameListElem *const d, const mDNSBool add)
{
request_state *request;
#if APPLE_OSX_mDNSResponder
machserver_automatic_registration_domain_changed(&d->name, add);
#endif // APPLE_OSX_mDNSResponder
LogMsg("%s registration domain %##s", add ? "Adding" : "Removing", d->name.c);
for (request = all_requests; request; request = request->next)
{
if (request->terminate != regservice_termination_callback) continue;
if (!request->u.servicereg.default_domain) continue;
if (!d->uid || SystemUID(request->uid) || request->uid == d->uid)
{
service_instance **ptr = &request->u.servicereg.instances;
while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next;
if (add)
{
// If we don't already have this domain in our list for this registration, add it now
if (!*ptr) register_service_instance(request, &d->name);
else debugf("udsserver_default_reg_domain_changed %##s already in list, not re-adding", &d->name);
}
else
{
// Normally we should not fail to find the specified instance
// One case where this can happen is if a uDNS update fails for some reason,
// and regservice_callback then calls unlink_and_free_service_instance and disposes of that instance.
if (!*ptr)
LogMsg("udsserver_default_reg_domain_changed domain %##s not found for service %#s type %s",
&d->name, request->u.servicereg.name.c, request->u.servicereg.type_as_string);
else
{
DNameListElem *p;
for (p = AutoRegistrationDomains; p; p=p->next)
if (!p->uid || SystemUID(request->uid) || request->uid == p->uid)
if (SameDomainName(&d->name, &p->name)) break;
if (p) debugf("udsserver_default_reg_domain_changed %##s still in list, not removing", &d->name);
else
{
mStatus err;
service_instance *si = *ptr;
*ptr = si->next;
if (si->clientnotified) SendServiceRemovalNotification(&si->srs); // Do this *before* clearing si->request backpointer
// Now that we've cut this service_instance from the list, we MUST clear the si->request backpointer.
// Otherwise what can happen is this: While our mDNS_DeregisterService is in the
// process of completing asynchronously, the client cancels the entire operation, so
// regservice_termination_callback then runs through the whole list deregistering each
// instance, clearing the backpointers, and then disposing the parent request_state object.
// However, because this service_instance isn't in the list any more, regservice_termination_callback
// has no way to find it and clear its backpointer, and then when our mDNS_DeregisterService finally
// completes later with a mStatus_MemFree message, it calls unlink_and_free_service_instance() with
// a service_instance with a stale si->request backpointer pointing to memory that's already been freed.
si->request = NULL;
err = mDNS_DeregisterService(&mDNSStorage, &si->srs);
if (err) { LogMsg("udsserver_default_reg_domain_changed err %d", err); unlink_and_free_service_instance(si); }
}
}
}
}
}
}
mDNSlocal mStatus handle_regservice_request(request_state *request)
{
char name[256]; // Lots of spare space for extra-long names that we'll auto-truncate down to 63 bytes
char domain[MAX_ESCAPED_DOMAIN_NAME], host[MAX_ESCAPED_DOMAIN_NAME];
char type_as_string[MAX_ESCAPED_DOMAIN_NAME];
domainname d, srv;
mStatus err;
const char *msgTXTData;
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
if (interfaceIndex && !InterfaceID)
{ LogMsg("ERROR: handle_regservice_request - Couldn't find interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); }
if (get_string(&request->msgptr, request->msgend, name, sizeof(name)) < 0 ||
get_string(&request->msgptr, request->msgend, type_as_string, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
get_string(&request->msgptr, request->msgend, host, MAX_ESCAPED_DOMAIN_NAME) < 0)
{ LogMsg("ERROR: handle_regservice_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); }
request->flags = flags;
request->u.servicereg.InterfaceID = InterfaceID;
request->u.servicereg.instances = NULL;
request->u.servicereg.txtlen = 0;
request->u.servicereg.txtdata = NULL;
mDNSPlatformStrLCopy(request->u.servicereg.type_as_string, type_as_string, sizeof(request->u.servicereg.type_as_string));
if (request->msgptr + 2 > request->msgend) request->msgptr = NULL;
else
{
request->u.servicereg.port.b[0] = *request->msgptr++;
request->u.servicereg.port.b[1] = *request->msgptr++;
}
request->u.servicereg.txtlen = get_uint16(&request->msgptr, request->msgend);
msgTXTData = get_rdata(&request->msgptr, request->msgend, request->u.servicereg.txtlen);
if (!request->msgptr)
{
LogMsg("%3d: DNSServiceRegister(unreadable parameters)", request->sd);
return(mStatus_BadParamErr);
}
if (request->u.servicereg.txtlen)
{
request->u.servicereg.txtdata = mallocL("service_info txtdata", request->u.servicereg.txtlen);
if (!request->u.servicereg.txtdata) FatalError("ERROR: handle_regservice_request - malloc");
mDNSPlatformMemCopy(request->u.servicereg.txtdata, msgTXTData, request->u.servicereg.txtlen);
}
// Check for sub-types after the service type
request->u.servicereg.num_subtypes = ChopSubTypes(request->u.servicereg.type_as_string); // Note: Modifies regtype string to remove trailing subtypes
if (request->u.servicereg.num_subtypes < 0)
{ LogMsg("ERROR: handle_regservice_request - ChopSubTypes failed %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); }
// Don't try to construct "domainname t" until *after* ChopSubTypes has worked its magic
if (!*request->u.servicereg.type_as_string || !MakeDomainNameFromDNSNameString(&request->u.servicereg.type, request->u.servicereg.type_as_string))
{ LogMsg("ERROR: handle_regservice_request - type_as_string bad %s", request->u.servicereg.type_as_string); return(mStatus_BadParamErr); }
if (!name[0])
{
request->u.servicereg.name = mDNSStorage.nicelabel;
request->u.servicereg.autoname = mDNStrue;
}
else
{
// If the client is allowing AutoRename, then truncate name to legal length before converting it to a DomainLabel
if ((flags & kDNSServiceFlagsNoAutoRename) == 0)
{
int newlen = TruncateUTF8ToLength((mDNSu8*)name, mDNSPlatformStrLen(name), MAX_DOMAIN_LABEL);
name[newlen] = 0;
}
if (!MakeDomainLabelFromLiteralString(&request->u.servicereg.name, name))
{ LogMsg("ERROR: handle_regservice_request - name bad %s", name); return(mStatus_BadParamErr); }
request->u.servicereg.autoname = mDNSfalse;
}
if (*domain)
{
request->u.servicereg.default_domain = mDNSfalse;
if (!MakeDomainNameFromDNSNameString(&d, domain))
{ LogMsg("ERROR: handle_regservice_request - domain bad %s", domain); return(mStatus_BadParamErr); }
}
else
{
request->u.servicereg.default_domain = mDNStrue;
MakeDomainNameFromDNSNameString(&d, "local.");
}
if (!ConstructServiceName(&srv, &request->u.servicereg.name, &request->u.servicereg.type, &d))
{
LogMsg("ERROR: handle_regservice_request - Couldn't ConstructServiceName from, “%#s” “%##s” “%##s”",
request->u.servicereg.name.c, request->u.servicereg.type.c, d.c); return(mStatus_BadParamErr);
}
if (!MakeDomainNameFromDNSNameString(&request->u.servicereg.host, host))
{ LogMsg("ERROR: handle_regservice_request - host bad %s", host); return(mStatus_BadParamErr); }
request->u.servicereg.autorename = (flags & kDNSServiceFlagsNoAutoRename ) == 0;
request->u.servicereg.allowremotequery = (flags & kDNSServiceFlagsAllowRemoteQuery) != 0;
// Some clients use mDNS for lightweight copy protection, registering a pseudo-service with
// a port number of zero. When two instances of the protected client are allowed to run on one
// machine, we don't want to see misleading "Bogus client" messages in syslog and the console.
if (!mDNSIPPortIsZero(request->u.servicereg.port))
{
int count = CountExistingRegistrations(&srv, request->u.servicereg.port);
if (count)
LogMsg("Client application registered %d identical instances of service %##s port %u.",
count+1, srv.c, mDNSVal16(request->u.servicereg.port));
}
LogOperation("%3d: DNSServiceRegister(%X, %d, \"%s\", \"%s\", \"%s\", \"%s\", %u) START",
request->sd, flags, interfaceIndex, name, request->u.servicereg.type_as_string, domain, host, mDNSVal16(request->u.servicereg.port));
// We need to unconditionally set request->terminate, because even if we didn't successfully
// start any registrations right now, subsequent configuration changes may cause successful
// registrations to be added, and we'll need to cancel them before freeing this memory.
// We also need to set request->terminate first, before adding additional service instances,
// because the uds_validatelists uses the request->terminate function pointer to determine
// what kind of request this is, and therefore what kind of list validation is required.
request->terminate = regservice_termination_callback;
err = register_service_instance(request, &d);
#if 0
err = AuthorizedDomain(request, &d, AutoRegistrationDomains) ? register_service_instance(request, &d) : mStatus_NoError;
#endif
if (!err)
{
if (request->u.servicereg.autoname) UpdateDeviceInfoRecord(&mDNSStorage);
if (!*domain)
{
DNameListElem *ptr;
// Note that we don't report errors for non-local, non-explicit domains
for (ptr = AutoRegistrationDomains; ptr; ptr = ptr->next)
if (!ptr->uid || SystemUID(request->uid) || request->uid == ptr->uid)
register_service_instance(request, &ptr->name);
}
}
return(err);
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceBrowse
#endif
mDNSlocal void FoundInstance(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
{
const DNSServiceFlags flags = AddRecord ? kDNSServiceFlagsAdd : 0;
request_state *req = question->QuestionContext;
reply_state *rep;
(void)m; // Unused
if (answer->rrtype != kDNSType_PTR)
{ LogMsg("%3d: FoundInstance: Should not be called with rrtype %d (not a PTR record)", req->sd, answer->rrtype); return; }
if (GenerateNTDResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError) != mStatus_NoError)
{
if (SameDomainName(&req->u.browser.regtype, (const domainname*)"\x09_services\x07_dns-sd\x04_udp"))
{
// Special support to enable the DNSServiceBrowse call made by Bonjour Browser
// Remove after Bonjour Browser is updated to use DNSServiceQueryRecord instead of DNSServiceBrowse
GenerateBonjourBrowserResponse(&answer->rdata->u.name, answer->InterfaceID, req, &rep, browse_reply_op, flags, mStatus_NoError);
goto bonjourbrowserhack;
}
LogMsg("%3d: FoundInstance: %##s PTR %##s received from network is not valid DNS-SD service pointer",
req->sd, answer->name->c, answer->rdata->u.name.c);
return;
}
bonjourbrowserhack:
LogOperation("%3d: DNSServiceBrowse(%##s, %s) RESULT %s %d: %s",
req->sd, question->qname.c, DNSTypeName(question->qtype), AddRecord ? "Add" : "Rmv",
mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse), RRDisplayString(m, answer));
append_reply(req, rep);
}
mDNSlocal mStatus add_domain_to_browser(request_state *info, const domainname *d)
{
browser_t *b, *p;
mStatus err;
for (p = info->u.browser.browsers; p; p = p->next)
{
if (SameDomainName(&p->domain, d))
{ debugf("add_domain_to_browser %##s already in list", d->c); return mStatus_AlreadyRegistered; }
}
b = mallocL("browser_t", sizeof(*b));
if (!b) return mStatus_NoMemoryErr;
AssignDomainName(&b->domain, d);
err = mDNS_StartBrowse(&mDNSStorage, &b->q,
&info->u.browser.regtype, d, info->u.browser.interface_id, info->u.browser.ForceMCast, FoundInstance, info);
if (err)
{
LogMsg("mDNS_StartBrowse returned %d for type %##s domain %##s", err, info->u.browser.regtype.c, d->c);
freeL("browser_t/add_domain_to_browser", b);
}
else
{
b->next = info->u.browser.browsers;
info->u.browser.browsers = b;
LogOperation("%3d: DNSServiceBrowse(%##s) START", info->sd, b->q.qname.c);
if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&b->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P)))
{
domainname tmp;
ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &b->domain);
LogInfo("add_domain_to_browser: calling external_start_browsing_for_service()");
external_start_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR);
}
}
return err;
}
mDNSlocal void browse_termination_callback(request_state *info)
{
while (info->u.browser.browsers)
{
browser_t *ptr = info->u.browser.browsers;
if (info->u.browser.interface_id == mDNSInterface_P2P || (!info->u.browser.interface_id && SameDomainName(&ptr->domain, &localdomain) && (info->flags & kDNSServiceFlagsIncludeP2P)))
{
domainname tmp;
ConstructServiceName(&tmp, NULL, &info->u.browser.regtype, &ptr->domain);
LogInfo("browse_termination_callback: calling external_stop_browsing_for_service()");
external_stop_browsing_for_service(&mDNSStorage, &tmp, kDNSType_PTR);
}
info->u.browser.browsers = ptr->next;
LogOperation("%3d: DNSServiceBrowse(%##s) STOP", info->sd, ptr->q.qname.c);
mDNS_StopBrowse(&mDNSStorage, &ptr->q); // no need to error-check result
freeL("browser_t/browse_termination_callback", ptr);
}
}
mDNSlocal void udsserver_automatic_browse_domain_changed(const DNameListElem *const d, const mDNSBool add)
{
request_state *request;
debugf("udsserver_automatic_browse_domain_changed: %s default browse domain %##s", add ? "Adding" : "Removing", d->name.c);
#if APPLE_OSX_mDNSResponder
machserver_automatic_browse_domain_changed(&d->name, add);
#endif // APPLE_OSX_mDNSResponder
for (request = all_requests; request; request = request->next)
{
if (request->terminate != browse_termination_callback) continue; // Not a browse operation
if (!request->u.browser.default_domain) continue; // Not an auto-browse operation
if (!d->uid || SystemUID(request->uid) || request->uid == d->uid)
{
browser_t **ptr = &request->u.browser.browsers;
while (*ptr && !SameDomainName(&(*ptr)->domain, &d->name)) ptr = &(*ptr)->next;
if (add)
{
// If we don't already have this domain in our list for this browse operation, add it now
if (!*ptr) add_domain_to_browser(request, &d->name);
else debugf("udsserver_automatic_browse_domain_changed %##s already in list, not re-adding", &d->name);
}
else
{
if (!*ptr) LogMsg("udsserver_automatic_browse_domain_changed ERROR %##s not found", &d->name);
else
{
DNameListElem *p;
for (p = AutoBrowseDomains; p; p=p->next)
if (!p->uid || SystemUID(request->uid) || request->uid == p->uid)
if (SameDomainName(&d->name, &p->name)) break;
if (p) debugf("udsserver_automatic_browse_domain_changed %##s still in list, not removing", &d->name);
else
{
browser_t *rem = *ptr;
*ptr = (*ptr)->next;
mDNS_StopQueryWithRemoves(&mDNSStorage, &rem->q);
freeL("browser_t/udsserver_automatic_browse_domain_changed", rem);
}
}
}
}
}
}
mDNSlocal void FreeARElemCallback(mDNS *const m, AuthRecord *const rr, mStatus result)
{
(void)m; // unused
if (result == mStatus_MemFree)
{
// On shutdown, mDNS_Close automatically deregisters all records
// Since in this case no one has called DeregisterLocalOnlyDomainEnumPTR to cut the record
// from the LocalDomainEnumRecords list, we do this here before we free the memory.
// (This should actually no longer be necessary, now that we do the proper cleanup in
// udsserver_exit. To confirm this, we'll log an error message if we do find a record that
// hasn't been cut from the list yet. If these messages don't appear, we can delete this code.)
ARListElem **ptr = &LocalDomainEnumRecords;
while (*ptr && &(*ptr)->ar != rr) ptr = &(*ptr)->next;
if (*ptr) { *ptr = (*ptr)->next; LogMsg("FreeARElemCallback: Have to cut %s", ARDisplayString(m, rr)); }
mDNSPlatformMemFree(rr->RecordContext);
}
}
// RegisterLocalOnlyDomainEnumPTR and DeregisterLocalOnlyDomainEnumPTR largely duplicate code in
// "FoundDomain" in uDNS.c for creating and destroying these special mDNSInterface_LocalOnly records.
// We may want to turn the common code into a subroutine.
mDNSlocal void RegisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type)
{
// allocate/register legacy and non-legacy _browse PTR record
mStatus err;
ARListElem *ptr = mDNSPlatformMemAllocate(sizeof(*ptr));
debugf("Incrementing %s refcount for %##s",
(type == mDNS_DomainTypeBrowse ) ? "browse domain " :
(type == mDNS_DomainTypeRegistration ) ? "registration dom" :
(type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c);
mDNS_SetupResourceRecord(&ptr->ar, mDNSNULL, mDNSInterface_LocalOnly, kDNSType_PTR, 7200, kDNSRecordTypeShared, AuthRecordLocalOnly, FreeARElemCallback, ptr);
MakeDomainNameFromDNSNameString(&ptr->ar.namestorage, mDNS_DomainTypeNames[type]);
AppendDNSNameString (&ptr->ar.namestorage, "local");
AssignDomainName(&ptr->ar.resrec.rdata->u.name, d);
err = mDNS_Register(m, &ptr->ar);
if (err)
{
LogMsg("SetSCPrefsBrowseDomain: mDNS_Register returned error %d", err);
mDNSPlatformMemFree(ptr);
}
else
{
ptr->next = LocalDomainEnumRecords;
LocalDomainEnumRecords = ptr;
}
}
mDNSlocal void DeregisterLocalOnlyDomainEnumPTR(mDNS *m, const domainname *d, int type)
{
ARListElem **ptr = &LocalDomainEnumRecords;
domainname lhs; // left-hand side of PTR, for comparison
debugf("Decrementing %s refcount for %##s",
(type == mDNS_DomainTypeBrowse ) ? "browse domain " :
(type == mDNS_DomainTypeRegistration ) ? "registration dom" :
(type == mDNS_DomainTypeBrowseAutomatic) ? "automatic browse" : "?", d->c);
MakeDomainNameFromDNSNameString(&lhs, mDNS_DomainTypeNames[type]);
AppendDNSNameString (&lhs, "local");
while (*ptr)
{
if (SameDomainName(&(*ptr)->ar.resrec.rdata->u.name, d) && SameDomainName((*ptr)->ar.resrec.name, &lhs))
{
ARListElem *rem = *ptr;
*ptr = (*ptr)->next;
mDNS_Deregister(m, &rem->ar);
return;
}
else ptr = &(*ptr)->next;
}
}
mDNSlocal void AddAutoBrowseDomain(const mDNSu32 uid, const domainname *const name)
{
DNameListElem *new = mDNSPlatformMemAllocate(sizeof(DNameListElem));
if (!new) { LogMsg("ERROR: malloc"); return; }
AssignDomainName(&new->name, name);
new->uid = uid;
new->next = AutoBrowseDomains;
AutoBrowseDomains = new;
udsserver_automatic_browse_domain_changed(new, mDNStrue);
}
mDNSlocal void RmvAutoBrowseDomain(const mDNSu32 uid, const domainname *const name)
{
DNameListElem **p = &AutoBrowseDomains;
while (*p && (!SameDomainName(&(*p)->name, name) || (*p)->uid != uid)) p = &(*p)->next;
if (!*p) LogMsg("RmvAutoBrowseDomain: Got remove event for domain %##s not in list", name->c);
else
{
DNameListElem *ptr = *p;
*p = ptr->next;
udsserver_automatic_browse_domain_changed(ptr, mDNSfalse);
mDNSPlatformMemFree(ptr);
}
}
mDNSlocal void SetPrefsBrowseDomains(mDNS *m, DNameListElem *browseDomains, mDNSBool add)
{
DNameListElem *d;
for (d = browseDomains; d; d = d->next)
{
if (add)
{
RegisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse);
AddAutoBrowseDomain(d->uid, &d->name);
}
else
{
DeregisterLocalOnlyDomainEnumPTR(m, &d->name, mDNS_DomainTypeBrowse);
RmvAutoBrowseDomain(d->uid, &d->name);
}
}
}
mDNSlocal void UpdateDeviceInfoRecord(mDNS *const m)
{
int num_autoname = 0;
request_state *req;
for (req = all_requests; req; req = req->next)
if (req->terminate == regservice_termination_callback && req->u.servicereg.autoname)
num_autoname++;
// If DeviceInfo record is currently registered, see if we need to deregister it
if (m->DeviceInfo.resrec.RecordType != kDNSRecordTypeUnregistered)
if (num_autoname == 0 || !SameDomainLabelCS(m->DeviceInfo.resrec.name->c, m->nicelabel.c))
{
LogOperation("UpdateDeviceInfoRecord Deregister %##s", m->DeviceInfo.resrec.name);
mDNS_Deregister(m, &m->DeviceInfo);
}
// If DeviceInfo record is not currently registered, see if we need to register it
if (m->DeviceInfo.resrec.RecordType == kDNSRecordTypeUnregistered)
if (num_autoname > 0)
{
mDNSu8 len = m->HIHardware.c[0] < 255 - 6 ? m->HIHardware.c[0] : 255 - 6;
mDNS_SetupResourceRecord(&m->DeviceInfo, mDNSNULL, mDNSNULL, kDNSType_TXT, kStandardTTL, kDNSRecordTypeAdvisory, AuthRecordAny, mDNSNULL, mDNSNULL);
ConstructServiceName(&m->DeviceInfo.namestorage, &m->nicelabel, &DeviceInfoName, &localdomain);
mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 1, "model=", 6);
mDNSPlatformMemCopy(m->DeviceInfo.resrec.rdata->u.data + 7, m->HIHardware.c + 1, len);
m->DeviceInfo.resrec.rdata->u.data[0] = 6 + len; // "model=" plus the device string
m->DeviceInfo.resrec.rdlength = 7 + len; // One extra for the length byte at the start of the string
LogOperation("UpdateDeviceInfoRecord Register %##s", m->DeviceInfo.resrec.name);
mDNS_Register(m, &m->DeviceInfo);
}
}
mDNSexport void udsserver_handle_configchange(mDNS *const m)
{
request_state *req;
service_instance *ptr;
DNameListElem *RegDomains = NULL;
DNameListElem *BrowseDomains = NULL;
DNameListElem *p;
UpdateDeviceInfoRecord(m);
// For autoname services, see if the default service name has changed, necessitating an automatic update
for (req = all_requests; req; req = req->next)
if (req->terminate == regservice_termination_callback)
if (req->u.servicereg.autoname && !SameDomainLabelCS(req->u.servicereg.name.c, m->nicelabel.c))
{
req->u.servicereg.name = m->nicelabel;
for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next)
{
ptr->renameonmemfree = 1;
if (ptr->clientnotified) SendServiceRemovalNotification(&ptr->srs);
LogInfo("udsserver_handle_configchange: Calling deregister for Service %##s", ptr->srs.RR_PTR.resrec.name->c);
if (mDNS_DeregisterService_drt(m, &ptr->srs, mDNS_Dereg_rapid))
regservice_callback(m, &ptr->srs, mStatus_MemFree); // If service deregistered already, we can re-register immediately
}
}
// Let the platform layer get the current DNS information
mDNS_Lock(m);
mDNSPlatformSetDNSConfig(m, mDNSfalse, mDNSfalse, mDNSNULL, &RegDomains, &BrowseDomains);
mDNS_Unlock(m);
// Any automatic registration domains are also implicitly automatic browsing domains
if (RegDomains) SetPrefsBrowseDomains(m, RegDomains, mDNStrue); // Add the new list first
if (AutoRegistrationDomains) SetPrefsBrowseDomains(m, AutoRegistrationDomains, mDNSfalse); // Then clear the old list
// Add any new domains not already in our AutoRegistrationDomains list
for (p=RegDomains; p; p=p->next)
{
DNameListElem **pp = &AutoRegistrationDomains;
while (*pp && ((*pp)->uid != p->uid || !SameDomainName(&(*pp)->name, &p->name))) pp = &(*pp)->next;
if (!*pp) // If not found in our existing list, this is a new default registration domain
{
RegisterLocalOnlyDomainEnumPTR(m, &p->name, mDNS_DomainTypeRegistration);
udsserver_default_reg_domain_changed(p, mDNStrue);
}
else // else found same domainname in both old and new lists, so no change, just delete old copy
{
DNameListElem *del = *pp;
*pp = (*pp)->next;
mDNSPlatformMemFree(del);
}
}
// Delete any domains in our old AutoRegistrationDomains list that are now gone
while (AutoRegistrationDomains)
{
DNameListElem *del = AutoRegistrationDomains;
AutoRegistrationDomains = AutoRegistrationDomains->next; // Cut record from list FIRST,
DeregisterLocalOnlyDomainEnumPTR(m, &del->name, mDNS_DomainTypeRegistration);
udsserver_default_reg_domain_changed(del, mDNSfalse); // before calling udsserver_default_reg_domain_changed()
mDNSPlatformMemFree(del);
}
// Now we have our new updated automatic registration domain list
AutoRegistrationDomains = RegDomains;
// Add new browse domains to internal list
if (BrowseDomains) SetPrefsBrowseDomains(m, BrowseDomains, mDNStrue);
// Remove old browse domains from internal list
if (SCPrefBrowseDomains)
{
SetPrefsBrowseDomains(m, SCPrefBrowseDomains, mDNSfalse);
while (SCPrefBrowseDomains)
{
DNameListElem *fptr = SCPrefBrowseDomains;
SCPrefBrowseDomains = SCPrefBrowseDomains->next;
mDNSPlatformMemFree(fptr);
}
}
// Replace the old browse domains array with the new array
SCPrefBrowseDomains = BrowseDomains;
}
mDNSlocal void AutomaticBrowseDomainChange(mDNS *const m, DNSQuestion *q, const ResourceRecord *const answer, QC_result AddRecord)
{
(void)m; // unused;
(void)q; // unused
LogOperation("AutomaticBrowseDomainChange: %s automatic browse domain %##s",
AddRecord ? "Adding" : "Removing", answer->rdata->u.name.c);
if (AddRecord) AddAutoBrowseDomain(0, &answer->rdata->u.name);
else RmvAutoBrowseDomain(0, &answer->rdata->u.name);
}
mDNSlocal mStatus handle_sethost_request(request_state *request)
{
get_flags(&request->msgptr, request->msgend);
char hostName[MAX_DOMAIN_LABEL];
int len = 0;
if (get_string(&request->msgptr, request->msgend, hostName,
MAX_DOMAIN_LABEL) < 0) return (mStatus_BadParamErr);
LogOperation("%3d: DNSSetHostname(%X, %d, nonstr ) START",
request->sd, request->flags);
// if we start using this as a callback for notification when the
// hostname changes we may need to cleanup from it
// request->terminate = sethost_termination_callback;
if(hostName[0] == 0) return mStatus_BadParamErr;
while (len < MAX_DOMAIN_LABEL && hostName[len+1]
&& hostName[len+1] != '.') len++;
strncpy(&(mDNSStorage.nicelabel.c[1]), hostName, len);
mDNSStorage.nicelabel.c[0] = len;
strncpy(&(mDNSStorage.hostlabel.c[1]), hostName, len);
mDNSStorage.hostlabel.c[0] = len;
mDNS_SetFQDN(&mDNSStorage);
return mStatus_NoError;
}
mDNSlocal mStatus handle_browse_request(request_state *request)
{
char regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME];
domainname typedn, d, temp;
mDNSs32 NumSubTypes;
mStatus err = mStatus_NoError;
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
if (get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0) return(mStatus_BadParamErr);
if (!request->msgptr) { LogMsg("%3d: DNSServiceBrowse(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
if (domain[0] == '\0') uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY);
request->flags = flags;
typedn.c[0] = 0;
NumSubTypes = ChopSubTypes(regtype); // Note: Modifies regtype string to remove trailing subtypes
if (NumSubTypes < 0 || NumSubTypes > 1) return(mStatus_BadParamErr);
if (NumSubTypes == 1 && !AppendDNSNameString(&typedn, regtype + strlen(regtype) + 1)) return(mStatus_BadParamErr);
if (!regtype[0] || !AppendDNSNameString(&typedn, regtype)) return(mStatus_BadParamErr);
if (!MakeDomainNameFromDNSNameString(&temp, regtype)) return(mStatus_BadParamErr);
// For over-long service types, we only allow domain "local"
if (temp.c[0] > 15 && domain[0] == 0) mDNSPlatformStrLCopy(domain, "local.", sizeof(domain));
// Set up browser info
request->u.browser.ForceMCast = (flags & kDNSServiceFlagsForceMulticast) != 0;
request->u.browser.interface_id = InterfaceID;
AssignDomainName(&request->u.browser.regtype, &typedn);
request->u.browser.default_domain = !domain[0];
request->u.browser.browsers = NULL;
LogOperation("%3d: DNSServiceBrowse(%X, %d, \"%##s\", \"%s\") START",
request->sd, request->flags, interfaceIndex, request->u.browser.regtype.c, domain);
// We need to unconditionally set request->terminate, because even if we didn't successfully
// start any browses right now, subsequent configuration changes may cause successful
// browses to be added, and we'll need to cancel them before freeing this memory.
request->terminate = browse_termination_callback;
if (domain[0])
{
if (!MakeDomainNameFromDNSNameString(&d, domain)) return(mStatus_BadParamErr);
err = add_domain_to_browser(request, &d);
#if 0
err = AuthorizedDomain(request, &d, AutoBrowseDomains) ? add_domain_to_browser(request, &d) : mStatus_NoError;
#endif
}
else
{
DNameListElem *sdom;
for (sdom = AutoBrowseDomains; sdom; sdom = sdom->next)
if (!sdom->uid || SystemUID(request->uid) || request->uid == sdom->uid)
{
err = add_domain_to_browser(request, &sdom->name);
if (err)
{
if (SameDomainName(&sdom->name, &localdomain)) break;
else err = mStatus_NoError; // suppress errors for non-local "default" domains
}
}
}
return(err);
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceResolve
#endif
mDNSlocal void resolve_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
{
size_t len = 0;
char fullname[MAX_ESCAPED_DOMAIN_NAME], target[MAX_ESCAPED_DOMAIN_NAME];
char *data;
reply_state *rep;
request_state *req = question->QuestionContext;
(void)m; // Unused
LogOperation("%3d: DNSServiceResolve(%##s) %s %s", req->sd, question->qname.c, AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer));
if (!AddRecord)
{
if (req->u.resolve.srv == answer) req->u.resolve.srv = mDNSNULL;
if (req->u.resolve.txt == answer) req->u.resolve.txt = mDNSNULL;
return;
}
if (answer->rrtype == kDNSType_SRV) req->u.resolve.srv = answer;
if (answer->rrtype == kDNSType_TXT) req->u.resolve.txt = answer;
if (!req->u.resolve.txt || !req->u.resolve.srv) return; // only deliver result to client if we have both answers
ConvertDomainNameToCString(answer->name, fullname);
ConvertDomainNameToCString(&req->u.resolve.srv->rdata->u.srv.target, target);
// calculate reply length
len += sizeof(DNSServiceFlags);
len += sizeof(mDNSu32); // interface index
len += sizeof(DNSServiceErrorType);
len += strlen(fullname) + 1;
len += strlen(target) + 1;
len += 2 * sizeof(mDNSu16); // port, txtLen
len += req->u.resolve.txt->rdlength;
// allocate/init reply header
rep = create_reply(resolve_reply_op, len, req);
rep->rhdr->flags = dnssd_htonl(0);
rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNSfalse));
rep->rhdr->error = dnssd_htonl(kDNSServiceErr_NoError);
data = (char *)&rep->rhdr[1];
// write reply data to message
put_string(fullname, &data);
put_string(target, &data);
*data++ = req->u.resolve.srv->rdata->u.srv.port.b[0];
*data++ = req->u.resolve.srv->rdata->u.srv.port.b[1];
put_uint16(req->u.resolve.txt->rdlength, &data);
put_rdata (req->u.resolve.txt->rdlength, req->u.resolve.txt->rdata->u.data, &data);
LogOperation("%3d: DNSServiceResolve(%s) RESULT %s:%d", req->sd, fullname, target, mDNSVal16(req->u.resolve.srv->rdata->u.srv.port));
append_reply(req, rep);
}
mDNSlocal void resolve_termination_callback(request_state *request)
{
LogOperation("%3d: DNSServiceResolve(%##s) STOP", request->sd, request->u.resolve.qtxt.qname.c);
mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qtxt);
mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv);
if (request->u.resolve.external_advertise) external_stop_resolving_service(&request->u.resolve.qsrv.qname);
}
mDNSlocal mStatus handle_resolve_request(request_state *request)
{
char name[256], regtype[MAX_ESCAPED_DOMAIN_NAME], domain[MAX_ESCAPED_DOMAIN_NAME];
domainname fqdn;
mStatus err;
// extract the data from the message
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
mDNSInterfaceID InterfaceID;
mDNSBool wasP2P = (interfaceIndex == kDNSServiceInterfaceIndexP2P);
request->flags = flags;
if (wasP2P) interfaceIndex = kDNSServiceInterfaceIndexAny;
InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
if (interfaceIndex && !InterfaceID)
{ LogMsg("ERROR: handle_resolve_request bad interfaceIndex %d", interfaceIndex); return(mStatus_BadParamErr); }
if (get_string(&request->msgptr, request->msgend, name, 256) < 0 ||
get_string(&request->msgptr, request->msgend, regtype, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
get_string(&request->msgptr, request->msgend, domain, MAX_ESCAPED_DOMAIN_NAME) < 0)
{ LogMsg("ERROR: handle_resolve_request - Couldn't read name/regtype/domain"); return(mStatus_BadParamErr); }
if (!request->msgptr) { LogMsg("%3d: DNSServiceResolve(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
if (build_domainname_from_strings(&fqdn, name, regtype, domain) < 0)
{ LogMsg("ERROR: handle_resolve_request bad “%s” “%s” “%s”", name, regtype, domain); return(mStatus_BadParamErr); }
mDNSPlatformMemZero(&request->u.resolve, sizeof(request->u.resolve));
// format questions
request->u.resolve.qsrv.InterfaceID = InterfaceID;
request->u.resolve.qsrv.Target = zeroAddr;
AssignDomainName(&request->u.resolve.qsrv.qname, &fqdn);
request->u.resolve.qsrv.qtype = kDNSType_SRV;
request->u.resolve.qsrv.qclass = kDNSClass_IN;
request->u.resolve.qsrv.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
request->u.resolve.qsrv.ExpectUnique = mDNStrue;
request->u.resolve.qsrv.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
request->u.resolve.qsrv.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
request->u.resolve.qsrv.SuppressUnusable = mDNSfalse;
request->u.resolve.qsrv.SearchListIndex = 0;
request->u.resolve.qsrv.AppendSearchDomains = 0;
request->u.resolve.qsrv.RetryWithSearchDomains = mDNSfalse;
request->u.resolve.qsrv.TimeoutQuestion = 0;
request->u.resolve.qsrv.WakeOnResolve = (flags & kDNSServiceFlagsWakeOnResolve) != 0;
request->u.resolve.qsrv.qnameOrig = mDNSNULL;
request->u.resolve.qsrv.QuestionCallback = resolve_result_callback;
request->u.resolve.qsrv.QuestionContext = request;
request->u.resolve.qtxt.InterfaceID = InterfaceID;
request->u.resolve.qtxt.Target = zeroAddr;
AssignDomainName(&request->u.resolve.qtxt.qname, &fqdn);
request->u.resolve.qtxt.qtype = kDNSType_TXT;
request->u.resolve.qtxt.qclass = kDNSClass_IN;
request->u.resolve.qtxt.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
request->u.resolve.qtxt.ExpectUnique = mDNStrue;
request->u.resolve.qtxt.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
request->u.resolve.qtxt.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
request->u.resolve.qtxt.SuppressUnusable = mDNSfalse;
request->u.resolve.qtxt.SearchListIndex = 0;
request->u.resolve.qtxt.AppendSearchDomains = 0;
request->u.resolve.qtxt.RetryWithSearchDomains = mDNSfalse;
request->u.resolve.qtxt.TimeoutQuestion = 0;
request->u.resolve.qtxt.WakeOnResolve = 0;
request->u.resolve.qtxt.qnameOrig = mDNSNULL;
request->u.resolve.qtxt.QuestionCallback = resolve_result_callback;
request->u.resolve.qtxt.QuestionContext = request;
request->u.resolve.ReportTime = NonZeroTime(mDNS_TimeNow(&mDNSStorage) + 130 * mDNSPlatformOneSecond);
request->u.resolve.external_advertise = mDNSfalse;
#if 0
if (!AuthorizedDomain(request, &fqdn, AutoBrowseDomains)) return(mStatus_NoError);
#endif
// ask the questions
LogOperation("%3d: DNSServiceResolve(%##s) START", request->sd, request->u.resolve.qsrv.qname.c);
err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qsrv);
if (!err)
{
err = mDNS_StartQuery(&mDNSStorage, &request->u.resolve.qtxt);
if (err) mDNS_StopQuery(&mDNSStorage, &request->u.resolve.qsrv);
else
{
request->terminate = resolve_termination_callback;
// If the user explicitly passed in P2P, we don't restrict the domain in which we resolve.
if (wasP2P || (!InterfaceID && IsLocalDomain(&fqdn) && (request->flags & kDNSServiceFlagsIncludeP2P)))
{
request->u.resolve.external_advertise = mDNStrue;
LogInfo("handle_resolve_request: calling external_start_resolving_service()");
external_start_resolving_service(&fqdn);
}
}
}
return(err);
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceQueryRecord
#endif
// mDNS operation functions. Each operation has 3 associated functions - a request handler that parses
// the client's request and makes the appropriate mDNSCore call, a result handler (passed as a callback
// to the mDNSCore routine) that sends results back to the client, and a termination routine that aborts
// the mDNSCore operation if the client dies or closes its socket.
// Returns -1 to tell the caller that it should not try to reissue the query anymore
// Returns 1 on successfully appending a search domain and the caller should reissue the new query
// Returns 0 when there are no more search domains and the caller should reissue the query
mDNSlocal int AppendNewSearchDomain(mDNS *const m, DNSQuestion *question)
{
domainname *sd;
mStatus err;
// Sanity check: The caller already checks this. We use -1 to indicate that we have searched all
// the domains and should try the single label query directly on the wire.
if (question->SearchListIndex == -1)
{
LogMsg("AppendNewSearchDomain: question %##s (%s) SearchListIndex is -1", question->qname.c, DNSTypeName(question->qtype));
return -1;
}
if (!question->AppendSearchDomains)
{
LogMsg("AppendNewSearchDomain: question %##s (%s) AppendSearchDoamins is 0", question->qname.c, DNSTypeName(question->qtype));
return -1;
}
// Save the original name, before we modify them below.
if (!question->qnameOrig)
{
question->qnameOrig = mallocL("AppendNewSearchDomain", sizeof(domainname));
if (!question->qnameOrig) { LogMsg("AppendNewSearchDomain: ERROR!! malloc failure"); return -1; }
question->qnameOrig->c[0] = 0;
AssignDomainName(question->qnameOrig, &question->qname);
LogInfo("AppendSearchDomain: qnameOrig %##s", question->qnameOrig->c);
}
sd = uDNS_GetNextSearchDomain(m, question->InterfaceID, &question->SearchListIndex, !question->AppendLocalSearchDomains);
// We use -1 to indicate that we have searched all the domains and should try the single label
// query directly on the wire. uDNS_GetNextSearchDomain should never return a negative value
if (question->SearchListIndex == -1)
{
LogMsg("AppendNewSearchDomain: ERROR!! uDNS_GetNextSearchDomain returned -1");
return -1;
}
// Not a common case. Perhaps, we should try the next search domain if it exceeds ?
if (sd && (DomainNameLength(question->qnameOrig) + DomainNameLength(sd)) > MAX_DOMAIN_NAME)
{
LogMsg("AppendNewSearchDomain: ERROR!! exceeding max domain length for %##s (%s) SearchDomain %##s length %d, Question name length %d", question->qnameOrig->c, DNSTypeName(question->qtype), sd->c, DomainNameLength(question->qnameOrig), DomainNameLength(sd));
return -1;
}
// if there are no more search domains and we have already tried this question
// without appending search domains, then we are done.
if (!sd && !ApplySearchDomainsFirst(question))
{
LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), not trying anymore", question->qname.c, DNSTypeName(question->qtype));
return -1;
}
// Stop the question before changing the name as negative cache entries could be pointing at this question.
// Even if we don't change the question in the case of returning 0, the caller is going to restart the
// question.
err = mDNS_StopQuery(&mDNSStorage, question);
if (err) { LogMsg("AppendNewSearchDomain: ERROR!! %##s %s mDNS_StopQuery: %d, while retrying with search domains", question->qname.c, DNSTypeName(question->qtype), (int)err); }
AssignDomainName(&question->qname, question->qnameOrig);
if (sd)
{
AppendDomainName(&question->qname, sd);
LogInfo("AppnedNewSearchDomain: Returning question with name %##s, SearchListIndex %d", question->qname.c, question->SearchListIndex);
return 1;
}
// Try the question as single label
LogInfo("AppnedNewSearchDomain: No more search domains for question with name %##s (%s), trying one last time", question->qname.c, DNSTypeName(question->qtype));
return 0;
}
#if APPLE_OSX_mDNSResponder
mDNSlocal mDNSBool DomainInSearchList(domainname *domain)
{
const SearchListElem *s;
for (s=SearchList; s; s=s->next)
if (SameDomainName(&s->domain, domain)) return mDNStrue;
return mDNSfalse;
}
// Workaround for networks using Microsoft Active Directory using "local" as a private internal
// top-level domain
mDNSlocal mStatus SendAdditionalQuery(DNSQuestion *q, request_state *request, mStatus err)
{
extern domainname ActiveDirectoryPrimaryDomain;
DNSQuestion **question2;
#define VALID_MSAD_SRV_TRANSPORT(T) (SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_tcp") || SameDomainLabel((T)->c, (const mDNSu8 *)"\x4_udp"))
#define VALID_MSAD_SRV(Q) ((Q)->qtype == kDNSType_SRV && VALID_MSAD_SRV_TRANSPORT(SecondLabel(&(Q)->qname)))
question2 = mDNSNULL;
if (request->hdr.op == query_request)
question2 = &request->u.queryrecord.q2;
else if (request->hdr.op == addrinfo_request)
{
if (q->qtype == kDNSType_A)
question2 = &request->u.addrinfo.q42;
else if (q->qtype == kDNSType_AAAA)
question2 = &request->u.addrinfo.q62;
}
if (!question2)
{
LogMsg("SendAdditionalQuery: question2 NULL for %##s (%s)", q->qname.c, DNSTypeName(q->qtype));
return mStatus_BadParamErr;
}
// Sanity check: If we already sent an additonal query, we don't need to send one more.
//
// 1. When the application calls DNSServiceQueryRecord or DNSServiceGetAddrInfo with a .local name, this function
// is called to see whether a unicast query should be sent or not.
//
// 2. As a result of appending search domains, the question may be end up with a .local suffix even though it
// was not a .local name to start with. In that case, queryrecord_result_callback calls this function to
// send the additional query.
//
// Thus, it should not be called more than once.
if (*question2)
{
LogInfo("SendAdditionalQuery: question2 already sent for %##s (%s), no more q2", q->qname.c, DNSTypeName(q->qtype));
return err;
}
if (!q->ForceMCast && SameDomainLabel(LastLabel(&q->qname), (const mDNSu8 *)&localdomain))
if (q->qtype == kDNSType_A || q->qtype == kDNSType_AAAA || VALID_MSAD_SRV(q))
{
DNSQuestion *q2;
int labels = CountLabels(&q->qname);
q2 = mallocL("DNSQuestion", sizeof(DNSQuestion));
if (!q2) FatalError("ERROR: SendAdditionalQuery malloc");
*question2 = q2;
*q2 = *q;
q2->InterfaceID = mDNSInterface_Unicast;
q2->ExpectUnique = mDNStrue;
// If the query starts as a single label e.g., somehost, and we have search domains with .local,
// queryrecord_result_callback calls this function when .local is appended to "somehost".
// At that time, the name in "q" is pointing at somehost.local and its qnameOrig pointing at
// "somehost". We need to copy that information so that when we retry with a different search
// domain e.g., mycompany.local, we get "somehost.mycompany.local".
if (q->qnameOrig)
{
(*question2)->qnameOrig = mallocL("SendAdditionalQuery", DomainNameLength(q->qnameOrig));
if (!(*question2)->qnameOrig) { LogMsg("SendAdditionalQuery: ERROR!! malloc failure"); return mStatus_NoMemoryErr; }
(*question2)->qnameOrig->c[0] = 0;
AssignDomainName((*question2)->qnameOrig, q->qnameOrig);
LogInfo("SendAdditionalQuery: qnameOrig %##s", (*question2)->qnameOrig->c);
}
// For names of the form "<one-or-more-labels>.bar.local." we always do a second unicast query in parallel.
// For names of the form "<one-label>.local." it's less clear whether we should do a unicast query.
// If the name being queried is exactly the same as the name in the DHCP "domain" option (e.g. the DHCP
// "domain" is my-small-company.local, and the user types "my-small-company.local" into their web browser)
// then that's a hint that it's worth doing a unicast query. Otherwise, we first check to see if the
// site's DNS server claims there's an SOA record for "local", and if so, that's also a hint that queries
// for names in the "local" domain will be safely answered privately before they hit the root name servers.
// Note that in the "my-small-company.local" example above there will typically be an SOA record for
// "my-small-company.local" but *not* for "local", which is why the "local SOA" check would fail in that case.
// We need to check against both ActiveDirectoryPrimaryDomain and SearchList. If it matches against either
// of those, we don't want do the SOA check for the local
if (labels == 2 && !SameDomainName(&q->qname, &ActiveDirectoryPrimaryDomain) && !DomainInSearchList(&q->qname))
{
AssignDomainName(&q2->qname, &localdomain);
q2->qtype = kDNSType_SOA;
q2->LongLived = mDNSfalse;
q2->ForceMCast = mDNSfalse;
q2->ReturnIntermed = mDNStrue;
// Don't append search domains for the .local SOA query
q2->AppendSearchDomains = 0;
q2->AppendLocalSearchDomains = 0;
q2->RetryWithSearchDomains = mDNSfalse;
q2->SearchListIndex = 0;
q2->TimeoutQuestion = 0;
}
LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast", request->sd, q2->qname.c, DNSTypeName(q2->qtype));
err = mDNS_StartQuery(&mDNSStorage, q2);
if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q2->qname.c, DNSTypeName(q2->qtype), (int)err);
}
return(err);
}
#endif // APPLE_OSX_mDNSResponder
// This function tries to append a search domain if valid and possible. If so, returns true.
mDNSlocal mDNSBool RetryQuestionWithSearchDomains(mDNS *const m, DNSQuestion *question, request_state *req)
{
int result;
// RetryWithSearchDomains tells the core to call us back so that we can retry with search domains if there is no
// answer in the cache or /etc/hosts. In the first call back from the core, we clear RetryWithSearchDomains so
// that we don't get called back repeatedly. If we got an answer from the cache or /etc/hosts, we don't touch
// RetryWithSearchDomains which may or may not be set.
//
// If we get e.g., NXDOMAIN and the query is neither suppressed nor exhausted the domain search list and
// is a valid question for appending search domains, retry by appending domains
if (!question->SuppressQuery && question->SearchListIndex != -1 && question->AppendSearchDomains)
{
question->RetryWithSearchDomains = 0;
result = AppendNewSearchDomain(m, question);
// As long as the result is either zero or 1, we retry the question. If we exahaust the search
// domains (result is zero) we try the original query (as it was before appending the search
// domains) as such on the wire as a last resort if we have not tried them before. For queries
// with more than one label, we have already tried them before appending search domains and
// hence don't retry again
if (result != -1)
{
mStatus err;
err = mDNS_StartQuery(m, question);
if (!err)
{
LogOperation("%3d: RetryQuestionWithSearchDomains(%##s, %s), retrying after appending search domain", req->sd, question->qname.c, DNSTypeName(question->qtype));
// If the result was zero, it meant that there are no search domains and we just retried the question
// as a single label and we should not retry with search domains anymore.
if (!result) question->SearchListIndex = -1;
return mDNStrue;
}
else
{
LogMsg("%3d: ERROR: RetryQuestionWithSearchDomains %##s %s mDNS_StartQuery: %d, while retrying with search domains", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err);
// We have already stopped the query and could not restart. Reset the appropriate pointers
// so that we don't call stop again when the question terminates
question->QuestionContext = mDNSNULL;
}
}
}
else
{
LogInfo("%3d: RetryQuestionWithSearchDomains: Not appending search domains - SuppressQuery %d, SearchListIndex %d, AppendSearchDomains %d", req->sd, question->SuppressQuery, question->SearchListIndex, question->AppendSearchDomains);
}
return mDNSfalse;
}
mDNSlocal void queryrecord_result_callback(mDNS *const m, DNSQuestion *question, const ResourceRecord *const answer, QC_result AddRecord)
{
char name[MAX_ESCAPED_DOMAIN_NAME];
request_state *req = question->QuestionContext;
reply_state *rep;
char *data;
size_t len;
DNSServiceErrorType error = kDNSServiceErr_NoError;
DNSQuestion *q = mDNSNULL;
#if APPLE_OSX_mDNSResponder
{
// Sanity check: QuestionContext is set to NULL after we stop the question and hence we should not
// get any callbacks from the core after this.
if (!req)
{
LogMsg("queryrecord_result_callback: ERROR!! QuestionContext NULL for %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
return;
}
if (req->hdr.op == query_request && question == req->u.queryrecord.q2)
q = &req->u.queryrecord.q;
else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q42)
q = &req->u.addrinfo.q4;
else if (req->hdr.op == addrinfo_request && question == req->u.addrinfo.q62)
q = &req->u.addrinfo.q6;
if (q && question->qtype != q->qtype && !SameDomainName(&question->qname, &q->qname))
{
mStatus err;
domainname *orig = question->qnameOrig;
LogInfo("queryrecord_result_callback: Stopping q2 local %##s", question->qname.c);
mDNS_StopQuery(m, question);
question->QuestionContext = mDNSNULL;
// We got a negative response for the SOA record indicating that .local does not exist.
// But we might have other search domains (that does not end in .local) that can be
// appended to this question. In that case, we want to retry the question. Otherwise,
// we don't want to try this question as unicast.
if (answer->RecordType == kDNSRecordTypePacketNegative && !q->AppendSearchDomains)
{
LogInfo("queryrecord_result_callback: question %##s AppendSearchDomains zero", q->qname.c);
return;
}
// If we got a non-negative answer for our "local SOA" test query, start an additional parallel unicast query
//
// Note: When we copy the original question, we copy everything including the AppendSearchDomains,
// RetryWithSearchDomains except for qnameOrig which can be non-NULL if the original question is
// e.g., somehost and then we appended e.g., ".local" and retried that question. See comment in
// SendAdditionalQuery as to how qnameOrig gets initialized.
*question = *q;
question->InterfaceID = mDNSInterface_Unicast;
question->ExpectUnique = mDNStrue;
question->qnameOrig = orig;
LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) unicast, context %p", req->sd, question->qname.c, DNSTypeName(question->qtype), question->QuestionContext);
// If the original question timed out, its QuestionContext would already be set to NULL and that's what we copied above.
// Hence, we need to set it explicitly here.
question->QuestionContext = req;
err = mDNS_StartQuery(m, question);
if (err) LogMsg("%3d: ERROR: queryrecord_result_callback %##s %s mDNS_StartQuery: %d", req->sd, question->qname.c, DNSTypeName(question->qtype), (int)err);
// If we got a positive response to local SOA, then try the .local question as unicast
if (answer->RecordType != kDNSRecordTypePacketNegative) return;
// Fall through and get the next search domain. The question is pointing at .local
// and we don't want to try that. Try the next search domain. Don't try with local
// search domains for the unicast question anymore.
//
// Note: we started the question above which will be stopped immediately (never sent on the wire)
// before we pick the next search domain below. RetryQuestionWithSearchDomains assumes that the
// question has already started.
question->AppendLocalSearchDomains = 0;
}
if (q && AddRecord && (question->InterfaceID == mDNSInterface_Unicast) && !answer->rdlength)
{
// If we get a negative response to the unicast query that we sent above, retry after appending search domains
// Note: We could have appended search domains below (where do it for regular unicast questions) instead of doing it here.
// As we ignore negative unicast answers below, we would never reach the code where the search domains are appended.
// To keep things simple, we handle unicast ".local" separately here.
LogInfo("queryrecord_result_callback: Retrying .local question %##s (%s) as unicast after appending search domains", question->qname.c, DNSTypeName(question->qtype));
if (RetryQuestionWithSearchDomains(m, question, req))
return;
if (question->AppendSearchDomains && !question->AppendLocalSearchDomains && IsLocalDomain(&question->qname))
{
// If "local" is the last search domain, we need to stop the question so that we don't send the "local"
// question on the wire as we got a negative response for the local SOA. But, we can't stop the question
// yet as we may have to timeout the question (done by the "core") for which we need to leave the question
// in the list. We leave it disabled so that it does not hit the wire.
LogInfo("queryrecord_result_callback: Disabling .local question %##s (%s)", question->qname.c, DNSTypeName(question->qtype));
question->ThisQInterval = 0;
}
}
// If we are here it means that either "question" is not "q2" OR we got a positive response for "q2" OR we have no more search
// domains to append for "q2". In all cases, fall through and deliver the response
}
#endif // APPLE_OSX_mDNSResponder
if (answer->RecordType == kDNSRecordTypePacketNegative)
{
// If this question needs to be timed out and we have reached the stop time, mark
// the error as timeout. It is possible that we might get a negative response from an
// external DNS server at the same time when this question reaches its stop time. We
// can't tell the difference as there is no indication in the callback. This should
// be okay as we will be timing out this query anyway.
mDNS_Lock(m);
if (question->TimeoutQuestion)
{
if ((m->timenow - question->StopTime) >= 0)
{
LogInfo("queryrecord_result_callback:Question %##s (%s) timing out, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID);
error = kDNSServiceErr_Timeout;
}
}
mDNS_Unlock(m);
// When we're doing parallel unicast and multicast queries for dot-local names (for supporting Microsoft
// Active Directory sites) we need to ignore negative unicast answers. Otherwise we'll generate negative
// answers for just about every single multicast name we ever look up, since the Microsoft Active Directory
// server is going to assert that pretty much every single multicast name doesn't exist.
//
// If we are timing out this query, we need to deliver the negative answer to the application
if (error != kDNSServiceErr_Timeout)
{
if (!answer->InterfaceID && IsLocalDomain(answer->name))
{
LogInfo("queryrecord_result_callback:Question %##s (%s) answering local with unicast", question->qname.c, DNSTypeName(question->qtype));
return;
}
error = kDNSServiceErr_NoSuchRecord;
}
AddRecord = mDNStrue;
}
// If we get a negative answer, try appending search domains. Don't append search domains
// - if we are timing out this question
// - if the negative response was received as a result of a multicast query
// - if this is an additional query (q2), we already appended search domains above (indicated by "!q" below)
if (error != kDNSServiceErr_Timeout)
{
if (!q && !answer->InterfaceID && !answer->rdlength && AddRecord)
{
// If the original question did not end in .local, we did not send an SOA query
// to figure out whether we should send an additional unicast query or not. If we just
// appended .local, we need to see if we need to send an additional query. This should
// normally happen just once because after we append .local, we ignore all negative
// responses for .local above.
LogInfo("queryrecord_result_callback: Retrying question %##s (%s) after appending search domains", question->qname.c, DNSTypeName(question->qtype));
if (RetryQuestionWithSearchDomains(m, question, req))
{
// Note: We need to call SendAdditionalQuery every time after appending a search domain as .local could
// be anywhere in the search domain list.
#if APPLE_OSX_mDNSResponder
mStatus err = mStatus_NoError;
err = SendAdditionalQuery(question, req, err);
if (err) LogMsg("queryrecord_result_callback: Sending .local SOA query failed, after appending domains");
#endif // APPLE_OSX_mDNSResponder
return;
}
}
}
ConvertDomainNameToCString(answer->name, name);
LogOperation("%3d: %s(%##s, %s) %s %s", req->sd,
req->hdr.op == query_request ? "DNSServiceQueryRecord" : "DNSServiceGetAddrInfo",
question->qname.c, DNSTypeName(question->qtype), AddRecord ? "ADD" : "RMV", RRDisplayString(m, answer));
len = sizeof(DNSServiceFlags); // calculate reply data length
len += sizeof(mDNSu32); // interface index
len += sizeof(DNSServiceErrorType);
len += strlen(name) + 1;
len += 3 * sizeof(mDNSu16); // type, class, rdlen
len += answer->rdlength;
len += sizeof(mDNSu32); // TTL
rep = create_reply(req->hdr.op == query_request ? query_reply_op : addrinfo_reply_op, len, req);
rep->rhdr->flags = dnssd_htonl(AddRecord ? kDNSServiceFlagsAdd : 0);
// Call mDNSPlatformInterfaceIndexfromInterfaceID, but suppressNetworkChange (last argument). Otherwise, if the
// InterfaceID is not valid, then it simulates a "NetworkChanged" which in turn makes questions
// to be stopped and started including *this* one. Normally the InterfaceID is valid. But when we
// are using the /etc/hosts entries to answer a question, the InterfaceID may not be known to the
// mDNS core . Eventually, we should remove the calls to "NetworkChanged" in
// mDNSPlatformInterfaceIndexfromInterfaceID when it can't find InterfaceID as ResourceRecords
// should not have existed to answer this question if the corresponding interface is not valid.
rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, answer->InterfaceID, mDNStrue));
rep->rhdr->error = dnssd_htonl(error);
data = (char *)&rep->rhdr[1];
put_string(name, &data);
put_uint16(answer->rrtype, &data);
put_uint16(answer->rrclass, &data);
put_uint16(answer->rdlength, &data);
// We need to use putRData here instead of the crude put_rdata function, because the crude put_rdata
// function just does a blind memory copy without regard to structures that may have holes in them.
if (answer->rdlength)
if (!putRData(mDNSNULL, (mDNSu8 *)data, (mDNSu8 *)rep->rhdr + len, answer))
LogMsg("queryrecord_result_callback putRData failed %d", (mDNSu8 *)rep->rhdr + len - (mDNSu8 *)data);
data += answer->rdlength;
put_uint32(AddRecord ? answer->rroriginalttl : 0, &data);
append_reply(req, rep);
// Stop the question, if we just timed out
if (error == kDNSServiceErr_Timeout)
{
mDNS_StopQuery(m, question);
// Reset the pointers so that we don't call stop on termination
question->QuestionContext = mDNSNULL;
}
#if APPLE_OSX_mDNSResponder
#if ! NO_WCF
CHECK_WCF_FUNCTION(WCFIsServerRunning)
{
struct xucred x;
socklen_t xucredlen = sizeof(x);
if (WCFIsServerRunning((WCFConnection *)m->WCF) && answer->rdlength != 0)
{
if (getsockopt(req->sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 &&
(x.cr_version == XUCRED_VERSION))
{
struct sockaddr_storage addr;
const RDataBody2 *const rdb = (RDataBody2 *)answer->rdata->u.data;
addr.ss_len = 0;
if (answer->rrtype == kDNSType_A || answer->rrtype == kDNSType_AAAA)
{
if (answer->rrtype == kDNSType_A)
{
struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
sin->sin_port = 0;
if (!putRData(mDNSNULL, (mDNSu8 *)&sin->sin_addr, (mDNSu8 *)(&sin->sin_addr + sizeof(rdb->ipv4)), answer))
LogMsg("queryrecord_result_callback: WCF AF_INET putRData failed");
else
{
addr.ss_len = sizeof (struct sockaddr_in);
addr.ss_family = AF_INET;
}
}
else if (answer->rrtype == kDNSType_AAAA)
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
sin6->sin6_port = 0;
if (!putRData(mDNSNULL, (mDNSu8 *)&sin6->sin6_addr, (mDNSu8 *)(&sin6->sin6_addr + sizeof(rdb->ipv6)), answer))
LogMsg("queryrecord_result_callback: WCF AF_INET6 putRData failed");
else
{
addr.ss_len = sizeof (struct sockaddr_in6);
addr.ss_family = AF_INET6;
}
}
if (addr.ss_len)
{
debugf("queryrecord_result_callback: Name %s, uid %u, addr length %d", name, x.cr_uid, addr.ss_len);
CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr)
{
WCFNameResolvesToAddr(m->WCF, name, (struct sockaddr *)&addr, x.cr_uid);
}
}
}
else if (answer->rrtype == kDNSType_CNAME)
{
domainname cname;
char cname_cstr[MAX_ESCAPED_DOMAIN_NAME];
if (!putRData(mDNSNULL, cname.c, (mDNSu8 *)(cname.c + MAX_DOMAIN_NAME), answer))
LogMsg("queryrecord_result_callback: WCF CNAME putRData failed");
else
{
ConvertDomainNameToCString(&cname, cname_cstr);
CHECK_WCF_FUNCTION((WCFConnection *)WCFNameResolvesToAddr)
{
WCFNameResolvesToName(m->WCF, name, cname_cstr, x.cr_uid);
}
}
}
}
else my_perror("queryrecord_result_callback: ERROR: getsockopt LOCAL_PEERCRED");
}
}
#endif
#endif
}
mDNSlocal void queryrecord_termination_callback(request_state *request)
{
LogOperation("%3d: DNSServiceQueryRecord(%##s, %s) STOP",
request->sd, request->u.queryrecord.q.qname.c, DNSTypeName(request->u.queryrecord.q.qtype));
if (request->u.queryrecord.q.QuestionContext)
{
mDNS_StopQuery(&mDNSStorage, &request->u.queryrecord.q); // no need to error check
request->u.queryrecord.q.QuestionContext = mDNSNULL;
}
else
{
DNSQuestion *question = &request->u.queryrecord.q;
LogInfo("queryrecord_termination_callback: question %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID);
}
if (request->u.queryrecord.q.qnameOrig)
{
freeL("QueryTermination", request->u.queryrecord.q.qnameOrig);
request->u.queryrecord.q.qnameOrig = mDNSNULL;
}
if (request->u.queryrecord.q.InterfaceID == mDNSInterface_P2P || (!request->u.queryrecord.q.InterfaceID && SameDomainName((const domainname *)LastLabel(&request->u.queryrecord.q.qname), &localdomain) && (request->flags & kDNSServiceFlagsIncludeP2P)))
{
LogInfo("queryrecord_termination_callback: calling external_stop_browsing_for_service()");
external_stop_browsing_for_service(&mDNSStorage, &request->u.queryrecord.q.qname, request->u.queryrecord.q.qtype);
}
if (request->u.queryrecord.q2)
{
if (request->u.queryrecord.q2->QuestionContext)
{
LogInfo("queryrecord_termination_callback: Stopping q2 %##s", request->u.queryrecord.q2->qname.c);
mDNS_StopQuery(&mDNSStorage, request->u.queryrecord.q2);
}
else
{
DNSQuestion *question = request->u.queryrecord.q2;
LogInfo("queryrecord_termination_callback: q2 %##s (%s) already stopped, InterfaceID %p", question->qname.c, DNSTypeName(question->qtype), question->InterfaceID);
}
if (request->u.queryrecord.q2->qnameOrig)
{
LogInfo("queryrecord_termination_callback: freeing q2 qnameOrig %##s", request->u.queryrecord.q2->qnameOrig->c);
freeL("QueryTermination q2", request->u.queryrecord.q2->qnameOrig);
request->u.queryrecord.q2->qnameOrig = mDNSNULL;
}
freeL("queryrecord Q2", request->u.queryrecord.q2);
request->u.queryrecord.q2 = mDNSNULL;
}
}
mDNSlocal mStatus handle_queryrecord_request(request_state *request)
{
DNSQuestion *const q = &request->u.queryrecord.q;
char name[256];
mDNSu16 rrtype, rrclass;
mStatus err;
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
if (get_string(&request->msgptr, request->msgend, name, 256) < 0) return(mStatus_BadParamErr);
rrtype = get_uint16(&request->msgptr, request->msgend);
rrclass = get_uint16(&request->msgptr, request->msgend);
if (!request->msgptr)
{ LogMsg("%3d: DNSServiceQueryRecord(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
request->flags = flags;
mDNSPlatformMemZero(&request->u.queryrecord, sizeof(request->u.queryrecord));
q->InterfaceID = InterfaceID;
q->Target = zeroAddr;
if (!MakeDomainNameFromDNSNameString(&q->qname, name)) return(mStatus_BadParamErr);
#if 0
if (!AuthorizedDomain(request, &q->qname, AutoBrowseDomains)) return (mStatus_NoError);
#endif
q->qtype = rrtype;
q->qclass = rrclass;
q->LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
q->ExpectUnique = mDNSfalse;
q->ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
q->ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
q->SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0;
q->TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0;
q->WakeOnResolve = 0;
q->QuestionCallback = queryrecord_result_callback;
q->QuestionContext = request;
q->SearchListIndex = 0;
// Don't append search domains for fully qualified domain names including queries
// such as e.g., "abc." that has only one label. We convert all names to FQDNs as internally
// we only deal with FQDNs. Hence, we cannot look at qname to figure out whether we should
// append search domains or not. So, we record that information in AppendSearchDomains.
//
// We append search domains only for queries that are a single label. If overriden using
// command line argument "AlwaysAppendSearchDomains", then we do it for any query which
// is not fully qualified.
if ((rrtype == kDNSType_A || rrtype == kDNSType_AAAA) && name[strlen(name) - 1] != '.' &&
(AlwaysAppendSearchDomains || CountLabels(&q->qname) == 1))
{
q->AppendSearchDomains = 1;
q->AppendLocalSearchDomains = 1;
}
else
{
q->AppendSearchDomains = 0;
q->AppendLocalSearchDomains = 0;
}
// For single label queries that are not fully qualified, look at /etc/hosts, cache and try
// search domains before trying them on the wire as a single label query. RetryWithSearchDomains
// tell the core to call back into the UDS layer if there is no valid response in /etc/hosts or
// the cache
q->RetryWithSearchDomains = ApplySearchDomainsFirst(q) ? 1 : 0;
q->qnameOrig = mDNSNULL;
LogOperation("%3d: DNSServiceQueryRecord(%X, %d, %##s, %s) START", request->sd, flags, interfaceIndex, q->qname.c, DNSTypeName(q->qtype));
err = mDNS_StartQuery(&mDNSStorage, q);
if (err) LogMsg("%3d: ERROR: DNSServiceQueryRecord %##s %s mDNS_StartQuery: %d", request->sd, q->qname.c, DNSTypeName(q->qtype), (int)err);
else
{
request->terminate = queryrecord_termination_callback;
if (q->InterfaceID == mDNSInterface_P2P || (!q->InterfaceID && SameDomainName((const domainname *)LastLabel(&q->qname), &localdomain) && (flags & kDNSServiceFlagsIncludeP2P)))
{
LogInfo("handle_queryrecord_request: calling external_start_browsing_for_service()");
external_start_browsing_for_service(&mDNSStorage, &q->qname, q->qtype);
}
}
#if APPLE_OSX_mDNSResponder
err = SendAdditionalQuery(q, request, err);
#endif // APPLE_OSX_mDNSResponder
return(err);
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceEnumerateDomains
#endif
mDNSlocal reply_state *format_enumeration_reply(request_state *request,
const char *domain, DNSServiceFlags flags, mDNSu32 ifi, DNSServiceErrorType err)
{
size_t len;
reply_state *reply;
char *data;
len = sizeof(DNSServiceFlags);
len += sizeof(mDNSu32);
len += sizeof(DNSServiceErrorType);
len += strlen(domain) + 1;
reply = create_reply(enumeration_reply_op, len, request);
reply->rhdr->flags = dnssd_htonl(flags);
reply->rhdr->ifi = dnssd_htonl(ifi);
reply->rhdr->error = dnssd_htonl(err);
data = (char *)&reply->rhdr[1];
put_string(domain, &data);
return reply;
}
mDNSlocal void enum_termination_callback(request_state *request)
{
mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all);
mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_default);
}
mDNSlocal void enum_result_callback(mDNS *const m,
DNSQuestion *const question, const ResourceRecord *const answer, QC_result AddRecord)
{
char domain[MAX_ESCAPED_DOMAIN_NAME];
request_state *request = question->QuestionContext;
DNSServiceFlags flags = 0;
reply_state *reply;
(void)m; // Unused
if (answer->rrtype != kDNSType_PTR) return;
#if 0
if (!AuthorizedDomain(request, &answer->rdata->u.name, request->u.enumeration.flags ? AutoRegistrationDomains : AutoBrowseDomains)) return;
#endif
// We only return add/remove events for the browse and registration lists
// For the default browse and registration answers, we only give an "ADD" event
if (question == &request->u.enumeration.q_default && !AddRecord) return;
if (AddRecord)
{
flags |= kDNSServiceFlagsAdd;
if (question == &request->u.enumeration.q_default) flags |= kDNSServiceFlagsDefault;
}
ConvertDomainNameToCString(&answer->rdata->u.name, domain);
// Note that we do NOT propagate specific interface indexes to the client - for example, a domain we learn from
// a machine's system preferences may be discovered on the LocalOnly interface, but should be browsed on the
// network, so we just pass kDNSServiceInterfaceIndexAny
reply = format_enumeration_reply(request, domain, flags, kDNSServiceInterfaceIndexAny, kDNSServiceErr_NoError);
if (!reply) { LogMsg("ERROR: enum_result_callback, format_enumeration_reply"); return; }
LogOperation("%3d: DNSServiceEnumerateDomains(%#2s) RESULT %s: %s", request->sd, question->qname.c, AddRecord ? "Add" : "Rmv", domain);
append_reply(request, reply);
}
mDNSlocal mStatus handle_enum_request(request_state *request)
{
mStatus err;
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
DNSServiceFlags reg = flags & kDNSServiceFlagsRegistrationDomains;
mDNS_DomainType t_all = reg ? mDNS_DomainTypeRegistration : mDNS_DomainTypeBrowse;
mDNS_DomainType t_default = reg ? mDNS_DomainTypeRegistrationDefault : mDNS_DomainTypeBrowseDefault;
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
if (!request->msgptr)
{ LogMsg("%3d: DNSServiceEnumerateDomains(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
// allocate context structures
uDNS_SetupSearchDomains(&mDNSStorage, UDNS_START_WAB_QUERY);
#if 0
// mark which kind of enumeration we're doing so we can (de)authorize certain domains
request->u.enumeration.flags = reg;
#endif
// enumeration requires multiple questions, so we must link all the context pointers so that
// necessary context can be reached from the callbacks
request->u.enumeration.q_all .QuestionContext = request;
request->u.enumeration.q_default.QuestionContext = request;
// if the caller hasn't specified an explicit interface, we use local-only to get the system-wide list.
if (!InterfaceID) InterfaceID = mDNSInterface_LocalOnly;
// make the calls
LogOperation("%3d: DNSServiceEnumerateDomains(%X=%s)", request->sd, flags,
(flags & kDNSServiceFlagsBrowseDomains ) ? "kDNSServiceFlagsBrowseDomains" :
(flags & kDNSServiceFlagsRegistrationDomains) ? "kDNSServiceFlagsRegistrationDomains" : "<<Unknown>>");
err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_all, t_all, NULL, InterfaceID, enum_result_callback, request);
if (!err)
{
err = mDNS_GetDomains(&mDNSStorage, &request->u.enumeration.q_default, t_default, NULL, InterfaceID, enum_result_callback, request);
if (err) mDNS_StopGetDomains(&mDNSStorage, &request->u.enumeration.q_all);
else request->terminate = enum_termination_callback;
}
return(err);
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceReconfirmRecord & Misc
#endif
mDNSlocal mStatus handle_reconfirm_request(request_state *request)
{
mStatus status = mStatus_BadParamErr;
AuthRecord *rr = read_rr_from_ipc_msg(request, 0, 0);
if (rr)
{
status = mDNS_ReconfirmByValue(&mDNSStorage, &rr->resrec);
LogOperation(
(status == mStatus_NoError) ?
"%3d: DNSServiceReconfirmRecord(%s) interface %d initiated" :
"%3d: DNSServiceReconfirmRecord(%s) interface %d failed: %d",
request->sd, RRDisplayString(&mDNSStorage, &rr->resrec),
mDNSPlatformInterfaceIndexfromInterfaceID(&mDNSStorage, rr->resrec.InterfaceID, mDNSfalse), status);
freeL("AuthRecord/handle_reconfirm_request", rr);
}
return(status);
}
mDNSlocal mStatus handle_setdomain_request(request_state *request)
{
char domainstr[MAX_ESCAPED_DOMAIN_NAME];
domainname domain;
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
(void)flags; // Unused
if (get_string(&request->msgptr, request->msgend, domainstr, MAX_ESCAPED_DOMAIN_NAME) < 0 ||
!MakeDomainNameFromDNSNameString(&domain, domainstr))
{ LogMsg("%3d: DNSServiceSetDefaultDomainForUser(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
LogOperation("%3d: DNSServiceSetDefaultDomainForUser(%##s)", request->sd, domain.c);
return(mStatus_NoError);
}
typedef packedstruct
{
mStatus err;
mDNSu32 len;
mDNSu32 vers;
} DaemonVersionReply;
mDNSlocal void handle_getproperty_request(request_state *request)
{
const mStatus BadParamErr = dnssd_htonl((mDNSu32)mStatus_BadParamErr);
char prop[256];
if (get_string(&request->msgptr, request->msgend, prop, sizeof(prop)) >= 0)
{
LogOperation("%3d: DNSServiceGetProperty(%s)", request->sd, prop);
if (!strcmp(prop, kDNSServiceProperty_DaemonVersion))
{
DaemonVersionReply x = { 0, dnssd_htonl(4), dnssd_htonl(_DNS_SD_H) };
send_all(request->sd, (const char *)&x, sizeof(x));
return;
}
}
// If we didn't recogize the requested property name, return BadParamErr
send_all(request->sd, (const char *)&BadParamErr, sizeof(BadParamErr));
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceNATPortMappingCreate
#endif
#define DNSServiceProtocol(X) ((X) == NATOp_AddrRequest ? 0 : (X) == NATOp_MapUDP ? kDNSServiceProtocol_UDP : kDNSServiceProtocol_TCP)
mDNSlocal void port_mapping_termination_callback(request_state *request)
{
LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) STOP", request->sd,
DNSServiceProtocol(request->u.pm.NATinfo.Protocol),
mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease);
mDNS_StopNATOperation(&mDNSStorage, &request->u.pm.NATinfo);
}
// Called via function pointer when we get a NAT-PMP address request or port mapping response
mDNSlocal void port_mapping_create_request_callback(mDNS *m, NATTraversalInfo *n)
{
request_state *request = (request_state *)n->clientContext;
reply_state *rep;
int replyLen;
char *data;
if (!request) { LogMsg("port_mapping_create_request_callback called with unknown request_state object"); return; }
// calculate reply data length
replyLen = sizeof(DNSServiceFlags);
replyLen += 3 * sizeof(mDNSu32); // if index + addr + ttl
replyLen += sizeof(DNSServiceErrorType);
replyLen += 2 * sizeof(mDNSu16); // Internal Port + External Port
replyLen += sizeof(mDNSu8); // protocol
rep = create_reply(port_mapping_reply_op, replyLen, request);
rep->rhdr->flags = dnssd_htonl(0);
rep->rhdr->ifi = dnssd_htonl(mDNSPlatformInterfaceIndexfromInterfaceID(m, n->InterfaceID, mDNSfalse));
rep->rhdr->error = dnssd_htonl(n->Result);
data = (char *)&rep->rhdr[1];
*data++ = request->u.pm.NATinfo.ExternalAddress.b[0];
*data++ = request->u.pm.NATinfo.ExternalAddress.b[1];
*data++ = request->u.pm.NATinfo.ExternalAddress.b[2];
*data++ = request->u.pm.NATinfo.ExternalAddress.b[3];
*data++ = DNSServiceProtocol(request->u.pm.NATinfo.Protocol);
*data++ = request->u.pm.NATinfo.IntPort.b[0];
*data++ = request->u.pm.NATinfo.IntPort.b[1];
*data++ = request->u.pm.NATinfo.ExternalPort.b[0];
*data++ = request->u.pm.NATinfo.ExternalPort.b[1];
put_uint32(request->u.pm.NATinfo.Lifetime, &data);
LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) RESULT %.4a:%u TTL %u", request->sd,
DNSServiceProtocol(request->u.pm.NATinfo.Protocol),
mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease,
&request->u.pm.NATinfo.ExternalAddress, mDNSVal16(request->u.pm.NATinfo.ExternalPort), request->u.pm.NATinfo.Lifetime);
append_reply(request, rep);
}
mDNSlocal mStatus handle_port_mapping_request(request_state *request)
{
mDNSu32 ttl = 0;
mStatus err = mStatus_NoError;
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
mDNSInterfaceID InterfaceID = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
mDNSu8 protocol = (mDNSu8)get_uint32(&request->msgptr, request->msgend);
(void)flags; // Unused
if (interfaceIndex && !InterfaceID) return(mStatus_BadParamErr);
if (request->msgptr + 8 > request->msgend) request->msgptr = NULL;
else
{
request->u.pm.NATinfo.IntPort.b[0] = *request->msgptr++;
request->u.pm.NATinfo.IntPort.b[1] = *request->msgptr++;
request->u.pm.ReqExt.b[0] = *request->msgptr++;
request->u.pm.ReqExt.b[1] = *request->msgptr++;
ttl = get_uint32(&request->msgptr, request->msgend);
}
if (!request->msgptr)
{ LogMsg("%3d: DNSServiceNATPortMappingCreate(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
if (protocol == 0) // If protocol == 0 (i.e. just request public address) then IntPort, ExtPort, ttl must be zero too
{
if (!mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort) || !mDNSIPPortIsZero(request->u.pm.ReqExt) || ttl) return(mStatus_BadParamErr);
}
else
{
if (mDNSIPPortIsZero(request->u.pm.NATinfo.IntPort)) return(mStatus_BadParamErr);
if (!(protocol & (kDNSServiceProtocol_UDP | kDNSServiceProtocol_TCP))) return(mStatus_BadParamErr);
}
request->u.pm.NATinfo.Protocol = !protocol ? NATOp_AddrRequest : (protocol == kDNSServiceProtocol_UDP) ? NATOp_MapUDP : NATOp_MapTCP;
// u.pm.NATinfo.IntPort = already set above
request->u.pm.NATinfo.RequestedPort = request->u.pm.ReqExt;
request->u.pm.NATinfo.NATLease = ttl;
request->u.pm.NATinfo.clientCallback = port_mapping_create_request_callback;
request->u.pm.NATinfo.clientContext = request;
LogOperation("%3d: DNSServiceNATPortMappingCreate(%X, %u, %u, %d) START", request->sd,
protocol, mDNSVal16(request->u.pm.NATinfo.IntPort), mDNSVal16(request->u.pm.ReqExt), request->u.pm.NATinfo.NATLease);
err = mDNS_StartNATOperation(&mDNSStorage, &request->u.pm.NATinfo);
if (err) LogMsg("ERROR: mDNS_StartNATOperation: %d", (int)err);
else request->terminate = port_mapping_termination_callback;
return(err);
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - DNSServiceGetAddrInfo
#endif
mDNSlocal void addrinfo_termination_callback(request_state *request)
{
LogOperation("%3d: DNSServiceGetAddrInfo(%##s) STOP", request->sd, request->u.addrinfo.q4.qname.c);
if (request->u.addrinfo.q4.QuestionContext)
{
mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4);
request->u.addrinfo.q4.QuestionContext = mDNSNULL;
}
if (request->u.addrinfo.q4.qnameOrig)
{
freeL("QueryTermination", request->u.addrinfo.q4.qnameOrig);
request->u.addrinfo.q4.qnameOrig = mDNSNULL;
}
if (request->u.addrinfo.q42)
{
if (request->u.addrinfo.q42->QuestionContext)
{
LogInfo("addrinfo_termination_callback: Stopping q42 %##s", request->u.addrinfo.q42->qname.c);
mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q42);
}
if (request->u.addrinfo.q42->qnameOrig)
{
LogInfo("addrinfo_termination_callback: freeing q42 qnameOrig %##s", request->u.addrinfo.q42->qnameOrig->c);
freeL("QueryTermination q42", request->u.addrinfo.q42->qnameOrig);
request->u.addrinfo.q42->qnameOrig = mDNSNULL;
}
freeL("addrinfo Q42", request->u.addrinfo.q42);
request->u.addrinfo.q42 = mDNSNULL;
}
if (request->u.addrinfo.q6.QuestionContext)
{
mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q6);
request->u.addrinfo.q6.QuestionContext = mDNSNULL;
}
if (request->u.addrinfo.q6.qnameOrig)
{
freeL("QueryTermination", request->u.addrinfo.q6.qnameOrig);
request->u.addrinfo.q6.qnameOrig = mDNSNULL;
}
if (request->u.addrinfo.q62)
{
if (request->u.addrinfo.q62->QuestionContext)
{
LogInfo("addrinfo_termination_callback: Stopping q62 %##s", request->u.addrinfo.q62->qname.c);
mDNS_StopQuery(&mDNSStorage, request->u.addrinfo.q62);
}
if (request->u.addrinfo.q62->qnameOrig)
{
LogInfo("addrinfo_termination_callback: freeing q62 qnameOrig %##s", request->u.addrinfo.q62->qnameOrig->c);
freeL("QueryTermination q62", request->u.addrinfo.q62->qnameOrig);
request->u.addrinfo.q62->qnameOrig = mDNSNULL;
}
freeL("addrinfo Q62", request->u.addrinfo.q62);
request->u.addrinfo.q62 = mDNSNULL;
}
}
mDNSlocal mStatus handle_addrinfo_request(request_state *request)
{
char hostname[256];
domainname d;
mStatus err = 0;
DNSServiceFlags flags = get_flags(&request->msgptr, request->msgend);
mDNSu32 interfaceIndex = get_uint32(&request->msgptr, request->msgend);
mDNSPlatformMemZero(&request->u.addrinfo, sizeof(request->u.addrinfo));
request->u.addrinfo.interface_id = mDNSPlatformInterfaceIDfromInterfaceIndex(&mDNSStorage, interfaceIndex);
request->u.addrinfo.flags = flags;
request->u.addrinfo.protocol = get_uint32(&request->msgptr, request->msgend);
if (interfaceIndex && !request->u.addrinfo.interface_id) return(mStatus_BadParamErr);
if (request->u.addrinfo.protocol > (kDNSServiceProtocol_IPv4|kDNSServiceProtocol_IPv6)) return(mStatus_BadParamErr);
if (get_string(&request->msgptr, request->msgend, hostname, 256) < 0) return(mStatus_BadParamErr);
if (!request->msgptr) { LogMsg("%3d: DNSServiceGetAddrInfo(unreadable parameters)", request->sd); return(mStatus_BadParamErr); }
if (!MakeDomainNameFromDNSNameString(&d, hostname))
{ LogMsg("ERROR: handle_addrinfo_request: bad hostname: %s", hostname); return(mStatus_BadParamErr); }
#if 0
if (!AuthorizedDomain(request, &d, AutoBrowseDomains)) return (mStatus_NoError);
#endif
if (!request->u.addrinfo.protocol)
{
flags |= kDNSServiceFlagsSuppressUnusable;
request->u.addrinfo.protocol = (kDNSServiceProtocol_IPv4 | kDNSServiceProtocol_IPv6);
}
request->u.addrinfo.q4.InterfaceID = request->u.addrinfo.q6.InterfaceID = request->u.addrinfo.interface_id;
request->u.addrinfo.q4.Target = request->u.addrinfo.q6.Target = zeroAddr;
request->u.addrinfo.q4.qname = request->u.addrinfo.q6.qname = d;
request->u.addrinfo.q4.qclass = request->u.addrinfo.q6.qclass = kDNSServiceClass_IN;
request->u.addrinfo.q4.LongLived = request->u.addrinfo.q6.LongLived = (flags & kDNSServiceFlagsLongLivedQuery ) != 0;
request->u.addrinfo.q4.ExpectUnique = request->u.addrinfo.q6.ExpectUnique = mDNSfalse;
request->u.addrinfo.q4.ForceMCast = request->u.addrinfo.q6.ForceMCast = (flags & kDNSServiceFlagsForceMulticast ) != 0;
request->u.addrinfo.q4.ReturnIntermed = request->u.addrinfo.q6.ReturnIntermed = (flags & kDNSServiceFlagsReturnIntermediates) != 0;
request->u.addrinfo.q4.SuppressUnusable = request->u.addrinfo.q6.SuppressUnusable = (flags & kDNSServiceFlagsSuppressUnusable ) != 0;
request->u.addrinfo.q4.TimeoutQuestion = request->u.addrinfo.q6.TimeoutQuestion = (flags & kDNSServiceFlagsTimeout ) != 0;
request->u.addrinfo.q4.WakeOnResolve = request->u.addrinfo.q6.WakeOnResolve = 0;
request->u.addrinfo.q4.qnameOrig = request->u.addrinfo.q6.qnameOrig = mDNSNULL;
if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4)
{
request->u.addrinfo.q4.qtype = kDNSServiceType_A;
request->u.addrinfo.q4.SearchListIndex = 0;
// We append search domains only for queries that are a single label. If overriden using
// command line argument "AlwaysAppendSearchDomains", then we do it for any query which
// is not fully qualified.
if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1))
{
request->u.addrinfo.q4.AppendSearchDomains = 1;
request->u.addrinfo.q4.AppendLocalSearchDomains = 1;
}
else
{
request->u.addrinfo.q4.AppendSearchDomains = 0;
request->u.addrinfo.q4.AppendLocalSearchDomains = 0;
}
request->u.addrinfo.q4.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q4) ? 1 : 0);
request->u.addrinfo.q4.QuestionCallback = queryrecord_result_callback;
request->u.addrinfo.q4.QuestionContext = request;
err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q4);
if (err != mStatus_NoError)
{
LogMsg("ERROR: mDNS_StartQuery: %d", (int)err);
request->u.addrinfo.q4.QuestionContext = mDNSNULL;
}
#if APPLE_OSX_mDNSResponder
err = SendAdditionalQuery(&request->u.addrinfo.q4, request, err);
#endif // APPLE_OSX_mDNSResponder
}
if (!err && (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv6))
{
request->u.addrinfo.q6.qtype = kDNSServiceType_AAAA;
request->u.addrinfo.q6.SearchListIndex = 0;
if (hostname[strlen(hostname) - 1] != '.' && (AlwaysAppendSearchDomains || CountLabels(&d) == 1))
{
request->u.addrinfo.q6.AppendSearchDomains = 1;
request->u.addrinfo.q6.AppendLocalSearchDomains = 1;
}
else
{
request->u.addrinfo.q6.AppendSearchDomains = 0;
request->u.addrinfo.q6.AppendLocalSearchDomains = 0;
}
request->u.addrinfo.q6.RetryWithSearchDomains = (ApplySearchDomainsFirst(&request->u.addrinfo.q6) ? 1 : 0);
request->u.addrinfo.q6.QuestionCallback = queryrecord_result_callback;
request->u.addrinfo.q6.QuestionContext = request;
err = mDNS_StartQuery(&mDNSStorage, &request->u.addrinfo.q6);
if (err != mStatus_NoError)
{
LogMsg("ERROR: mDNS_StartQuery: %d", (int)err);
request->u.addrinfo.q6.QuestionContext = mDNSNULL;
if (request->u.addrinfo.protocol & kDNSServiceProtocol_IPv4)
{
// If we started a query for IPv4, we need to cancel it
mDNS_StopQuery(&mDNSStorage, &request->u.addrinfo.q4);
request->u.addrinfo.q4.QuestionContext = mDNSNULL;
}
}
#if APPLE_OSX_mDNSResponder
err = SendAdditionalQuery(&request->u.addrinfo.q6, request, err);
#endif // APPLE_OSX_mDNSResponder
}
LogOperation("%3d: DNSServiceGetAddrInfo(%X, %d, %d, %##s) START",
request->sd, flags, interfaceIndex, request->u.addrinfo.protocol, d.c);
if (!err) request->terminate = addrinfo_termination_callback;
return(err);
}
// ***************************************************************************
#if COMPILER_LIKES_PRAGMA_MARK
#pragma mark -
#pragma mark - Main Request Handler etc.
#endif
mDNSlocal request_state *NewRequest(void)
{
request_state **p = &all_requests;
while (*p) p=&(*p)->next;
*p = mallocL("request_state", sizeof(request_state));
if (!*p) FatalError("ERROR: malloc");
mDNSPlatformMemZero(*p, sizeof(request_state));
return(*p);
}
// read_msg may be called any time when the transfer state (req->ts) is t_morecoming.
// if there is no data on the socket, the socket will be closed and t_terminated will be returned
mDNSlocal void read_msg(request_state *req)
{
if (req->ts == t_terminated || req->ts == t_error)
{ LogMsg("%3d: ERROR: read_msg called with transfer state terminated or error", req->sd); req->ts = t_error; return; }
if (req->ts == t_complete) // this must be death or something is wrong
{
char buf[4]; // dummy for death notification
int nread = udsSupportReadFD(req->sd, buf, 4, 0, req->platform_data);
if (!nread) { req->ts = t_terminated; return; }
if (nread < 0) goto rerror;
LogMsg("%3d: ERROR: read data from a completed request", req->sd);
req->ts = t_error;
return;
}
if (req->ts != t_morecoming)
{ LogMsg("%3d: ERROR: read_msg called with invalid transfer state (%d)", req->sd, req->ts); req->ts = t_error; return; }
if (req->hdr_bytes < sizeof(ipc_msg_hdr))
{
mDNSu32 nleft = sizeof(ipc_msg_hdr) - req->hdr_bytes;
int nread = udsSupportReadFD(req->sd, (char *)&req->hdr + req->hdr_bytes, nleft, 0, req->platform_data);
if (nread == 0) { req->ts = t_terminated; return; }
if (nread < 0) goto rerror;
req->hdr_bytes += nread;
if (req->hdr_bytes > sizeof(ipc_msg_hdr))
{ LogMsg("%3d: ERROR: read_msg - read too many header bytes", req->sd); req->ts = t_error; return; }
// only read data if header is complete
if (req->hdr_bytes == sizeof(ipc_msg_hdr))
{
ConvertHeaderBytes(&req->hdr);
if (req->hdr.version != VERSION)
{ LogMsg("%3d: ERROR: client version 0x%08X daemon version 0x%08X", req->sd, req->hdr.version, VERSION); req->ts = t_error; return; }
// Largest conceivable single request is a DNSServiceRegisterRecord() or DNSServiceAddRecord()
// with 64kB of rdata. Adding 1009 byte for a maximal domain name, plus a safety margin
// for other overhead, this means any message above 70kB is definitely bogus.
if (req->hdr.datalen > 70000)
{ LogMsg("%3d: ERROR: read_msg: hdr.datalen %u (0x%X) > 70000", req->sd, req->hdr.datalen, req->hdr.datalen); req->ts = t_error; return; }
req->msgbuf = mallocL("request_state msgbuf", req->hdr.datalen + MSG_PAD_BYTES);
if (!req->msgbuf) { my_perror("ERROR: malloc"); req->ts = t_error; return; }
req->msgptr = req->msgbuf;
req->msgend = req->msgbuf + req->hdr.datalen;
mDNSPlatformMemZero(req->msgbuf, req->hdr.datalen + MSG_PAD_BYTES);
}
}
// If our header is complete, but we're still needing more body data, then try to read it now
// Note: For cancel_request req->hdr.datalen == 0, but there's no error return socket for cancel_request
// Any time we need to get the error return socket we know we'll have at least one data byte
// (even if only the one-byte empty C string placeholder for the old ctrl_path parameter)
if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes < req->hdr.datalen)
{
mDNSu32 nleft = req->hdr.datalen - req->data_bytes;
int nread;
#if !defined(_WIN32)
struct iovec vec = { req->msgbuf + req->data_bytes, nleft }; // Tell recvmsg where we want the bytes put
struct msghdr msg;
struct cmsghdr *cmsg;
char cbuf[CMSG_SPACE(sizeof(dnssd_sock_t))];
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
msg.msg_control = cbuf;
msg.msg_controllen = sizeof(cbuf);
msg.msg_flags = 0;
nread = recvmsg(req->sd, &msg, 0);
#else
nread = udsSupportReadFD(req->sd, (char *)req->msgbuf + req->data_bytes, nleft, 0, req->platform_data);
#endif
if (nread == 0) { req->ts = t_terminated; return; }
if (nread < 0) goto rerror;
req->data_bytes += nread;
if (req->data_bytes > req->hdr.datalen)
{ LogMsg("%3d: ERROR: read_msg - read too many data bytes", req->sd); req->ts = t_error; return; }
#if !defined(_WIN32)
cmsg = CMSG_FIRSTHDR(&msg);
#if DEBUG_64BIT_SCM_RIGHTS
LogMsg("%3d: Expecting %d %d %d %d", req->sd, sizeof(cbuf), sizeof(cbuf), SOL_SOCKET, SCM_RIGHTS);
LogMsg("%3d: Got %d %d %d %d", req->sd, msg.msg_controllen, cmsg->cmsg_len, cmsg->cmsg_level, cmsg->cmsg_type);
#endif // DEBUG_64BIT_SCM_RIGHTS
if (msg.msg_controllen == sizeof(cbuf) &&
cmsg->cmsg_len == CMSG_LEN(sizeof(dnssd_sock_t)) &&
cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS)
{
#if APPLE_OSX_mDNSResponder
// Strictly speaking BPF_fd belongs solely in the platform support layer, but because
// of privilege separation on Mac OS X we need to get BPF_fd from mDNSResponderHelper,
// and it's convenient to repurpose the existing fd-passing code here for that task
if (req->hdr.op == send_bpf)
{
dnssd_sock_t x = *(dnssd_sock_t *)CMSG_DATA(cmsg);
LogOperation("%3d: Got BPF %d", req->sd, x);
mDNSPlatformReceiveBPF_fd(&mDNSStorage, x);
}
else
#endif // APPLE_OSX_mDNSResponder
req->errsd = *(dnssd_sock_t *)CMSG_DATA(cmsg);
#if DEBUG_64BIT_SCM_RIGHTS
LogMsg("%3d: read req->errsd %d", req->sd, req->errsd);
#endif // DEBUG_64BIT_SCM_RIGHTS
if (req->data_bytes < req->hdr.datalen)
{
LogMsg("%3d: Client sent error socket %d via SCM_RIGHTS with req->data_bytes %d < req->hdr.datalen %d",
req->sd, req->errsd, req->data_bytes, req->hdr.datalen);
req->ts = t_error;
return;
}
}
#endif
}
// If our header and data are both complete, see if we need to make our separate error return socket
if (req->hdr_bytes == sizeof(ipc_msg_hdr) && req->data_bytes == req->hdr.datalen)
{
if (req->terminate && req->hdr.op != cancel_request)
{
dnssd_sockaddr_t cliaddr;
#if defined(USE_TCP_LOOPBACK)
mDNSOpaque16 port;
u_long opt = 1;
port.b[0] = req->msgptr[0];
port.b[1] = req->msgptr[1];
req->msgptr += 2;
cliaddr.sin_family = AF_INET;
cliaddr.sin_port = port.NotAnInteger;
cliaddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR);
#else
char ctrl_path[MAX_CTLPATH];
get_string(&req->msgptr, req->msgend, ctrl_path, MAX_CTLPATH); // path is first element in message buffer
mDNSPlatformMemZero(&cliaddr, sizeof(cliaddr));
cliaddr.sun_family = AF_LOCAL;
mDNSPlatformStrCopy(cliaddr.sun_path, ctrl_path);
// If the error return path UDS name is empty string, that tells us
// that this is a new version of the library that's going to pass us
// the error return path socket via sendmsg/recvmsg
if (ctrl_path[0] == 0)
{
if (req->errsd == req->sd)
{ LogMsg("%3d: read_msg: ERROR failed to get errsd via SCM_RIGHTS", req->sd); req->ts = t_error; return; }
goto got_errfd;
}
#endif
req->errsd = socket(AF_DNSSD, SOCK_STREAM, 0);
if (!dnssd_SocketValid(req->errsd)) { my_perror("ERROR: socket"); req->ts = t_error; return; }
if (connect(req->errsd, (struct sockaddr *)&cliaddr, sizeof(cliaddr)) < 0)
{
#if !defined(USE_TCP_LOOPBACK)
struct stat sb;
LogMsg("%3d: read_msg: Couldn't connect to error return path socket “%s” errno %d (%s)",
req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno));
if (stat(cliaddr.sun_path, &sb) < 0)
LogMsg("%3d: read_msg: stat failed “%s” errno %d (%s)", req->sd, cliaddr.sun_path, dnssd_errno, dnssd_strerror(dnssd_errno));
else
LogMsg("%3d: read_msg: file “%s” mode %o (octal) uid %d gid %d", req->sd, cliaddr.sun_path, sb.st_mode, sb.st_uid, sb.st_gid);
#endif
req->ts = t_error;
return;
}
#if !defined(USE_TCP_LOOPBACK)
got_errfd:
#endif
LogOperation("%3d: Error socket %d created %08X %08X", req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0]);
#if defined(_WIN32)
if (ioctlsocket(req->errsd, FIONBIO, &opt) != 0)
#else
if (fcntl(req->errsd, F_SETFL, fcntl(req->errsd, F_GETFL, 0) | O_NONBLOCK) != 0)
#endif
{
LogMsg("%3d: ERROR: could not set control socket to non-blocking mode errno %d (%s)",
req->sd, dnssd_errno, dnssd_strerror(dnssd_errno));
req->ts = t_error;
return;
}
}
req->ts = t_complete;
}
return;
rerror:
if (dnssd_errno == dnssd_EWOULDBLOCK || dnssd_errno == dnssd_EINTR) return;
LogMsg("%3d: ERROR: read_msg errno %d (%s)", req->sd, dnssd_errno, dnssd_strerror(dnssd_errno));
req->ts = t_error;
}
#define RecordOrientedOp(X) \
((X) == reg_record_request || (X) == add_record_request || (X) == update_record_request || (X) == remove_record_request)
// The lightweight operations are the ones that don't need a dedicated request_state structure allocated for them
#define LightweightOp(X) (RecordOrientedOp(X) || (X) == cancel_request)
mDNSlocal void request_callback(int fd, short filter, void *info)
{
mStatus err = 0;
request_state *req = info;
mDNSs32 min_size = sizeof(DNSServiceFlags);
(void)fd; // Unused
(void)filter; // Unused
for (;;)
{
read_msg(req);
if (req->ts == t_morecoming) return;
if (req->ts == t_terminated || req->ts == t_error) { AbortUnlinkAndFree(req); return; }
if (req->ts != t_complete) { LogMsg("req->ts %d != t_complete", req->ts); AbortUnlinkAndFree(req); return; }
if (req->hdr.version != VERSION)
{
LogMsg("ERROR: client version %d incompatible with daemon version %d", req->hdr.version, VERSION);
AbortUnlinkAndFree(req);
return;
}
switch(req->hdr.op) // Interface + other data
{
case connection_request: min_size = 0; break;
case reg_service_request: min_size += sizeof(mDNSu32) + 4 /* name, type, domain, host */ + 4 /* port, textlen */; break;
case add_record_request: min_size += 4 /* type, rdlen */ + 4 /* ttl */; break;
case update_record_request: min_size += 2 /* rdlen */ + 4 /* ttl */; break;
case remove_record_request: break;
case browse_request: min_size += sizeof(mDNSu32) + 2 /* type, domain */; break;
case resolve_request: min_size += sizeof(mDNSu32) + 3 /* type, type, domain */; break;
case query_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 4 /* type, class*/; break;
case enumeration_request: min_size += sizeof(mDNSu32); break;
case reg_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */ + 4 /* ttl */; break;
case reconfirm_record_request: min_size += sizeof(mDNSu32) + 1 /* name */ + 6 /* type, class, rdlen */; break;
case setdomain_request: min_size += 1 /* domain */; break;
case getproperty_request: min_size = 2; break;
case port_mapping_request: min_size += sizeof(mDNSu32) + 4 /* udp/tcp */ + 4 /* int/ext port */ + 4 /* ttl */; break;
case addrinfo_request: min_size += sizeof(mDNSu32) + 4 /* v4/v6 */ + 1 /* hostname */; break;
case send_bpf: // Same as cancel_request below
case cancel_request: min_size = 0; break;
case sethost_request: min_size = sizeof(mDNSu32) + 1 /* hostname */; break;
default: LogMsg("ERROR: validate_message - unsupported req type: %d", req->hdr.op); min_size = -1; break;
}
if ((mDNSs32)req->data_bytes < min_size)
{ LogMsg("Invalid message %d bytes; min for %d is %d", req->data_bytes, req->hdr.op, min_size); AbortUnlinkAndFree(req); return; }
if (LightweightOp(req->hdr.op) && !req->terminate)
{ LogMsg("Reg/Add/Update/Remove %d require existing connection", req->hdr.op); AbortUnlinkAndFree(req); return; }
// check if client wants silent operation
if (req->hdr.ipc_flags & IPC_FLAGS_NOREPLY) req->no_reply = 1;
// If req->terminate is already set, this means this operation is sharing an existing connection
if (req->terminate && !LightweightOp(req->hdr.op))
{
request_state *newreq = NewRequest();
newreq->primary = req;
newreq->sd = req->sd;
newreq->errsd = req->errsd;
newreq->uid = req->uid;
newreq->hdr = req->hdr;
newreq->msgbuf = req->msgbuf;
newreq->msgptr = req->msgptr;
newreq->msgend = req->msgend;
req = newreq;
}
// If we're shutting down, don't allow new client requests
// We do allow "cancel" and "getproperty" during shutdown
if (mDNSStorage.ShutdownTime && req->hdr.op != cancel_request && req->hdr.op != getproperty_request)
{
err = mStatus_ServiceNotRunning;
}
else switch(req->hdr.op)
{
// These are all operations that have their own first-class request_state object
case connection_request: LogOperation("%3d: DNSServiceCreateConnection START", req->sd);
req->terminate = connection_termination; break;
case resolve_request: err = handle_resolve_request (req); break;
case query_request: err = handle_queryrecord_request (req); break;
case browse_request: err = handle_browse_request (req); break;
case reg_service_request: err = handle_regservice_request (req); break;
case enumeration_request: err = handle_enum_request (req); break;
case reconfirm_record_request: err = handle_reconfirm_request (req); break;
case setdomain_request: err = handle_setdomain_request (req); break;
case getproperty_request: handle_getproperty_request (req); break;
case port_mapping_request: err = handle_port_mapping_request(req); break;
case addrinfo_request: err = handle_addrinfo_request (req); break;
case send_bpf: /* Do nothing for send_bpf */ break;
// These are all operations that work with an existing request_state object
case reg_record_request: err = handle_regrecord_request (req); break;
case add_record_request: err = handle_add_request (req); break;
case update_record_request: err = handle_update_request (req); break;
case remove_record_request: err = handle_removerecord_request(req); break;
case cancel_request: handle_cancel_request (req); break;
case sethost_request: err = handle_sethost_request (req); break;
default: LogMsg("%3d: ERROR: Unsupported UDS req: %d", req->sd, req->hdr.op);
}
// req->msgbuf may be NULL, e.g. for connection_request or remove_record_request
if (req->msgbuf) freeL("request_state msgbuf", req->msgbuf);
// There's no return data for a cancel request (DNSServiceRefDeallocate returns no result)
// For a DNSServiceGetProperty call, the handler already generated the response, so no need to do it again here
if (req->hdr.op != cancel_request && req->hdr.op != getproperty_request && req->hdr.op != send_bpf)
{
const mStatus err_netorder = dnssd_htonl(err);
send_all(req->errsd, (const char *)&err_netorder, sizeof(err_netorder));
if (req->errsd != req->sd)
{
LogOperation("%3d: Error socket %d closed %08X %08X (%d)",
req->sd, req->errsd, req->hdr.client_context.u32[1], req->hdr.client_context.u32[0], err);
dnssd_close(req->errsd);
req->errsd = req->sd;
// Also need to reset the parent's errsd, if this is a subordinate operation
if (req->primary) req->primary->errsd = req->primary->sd;
}
}
// Reset ready to accept the next req on this pipe
if (req->primary) req = req->primary;
req->ts = t_morecoming;
req->hdr_bytes = 0;
req->data_bytes = 0;
req->msgbuf = mDNSNULL;
req->msgptr = mDNSNULL;
req->msgend = 0;
}
}
mDNSlocal void connect_callback(int fd, short filter, void *info)
{
dnssd_sockaddr_t cliaddr;
dnssd_socklen_t len = (dnssd_socklen_t) sizeof(cliaddr);
dnssd_sock_t sd = accept(fd, (struct sockaddr*) &cliaddr, &len);
#if defined(SO_NOSIGPIPE) || defined(_WIN32)
unsigned long optval = 1;
#endif
(void)filter; // Unused
(void)info; // Unused
if (!dnssd_SocketValid(sd))
{
if (dnssd_errno != dnssd_EWOULDBLOCK) my_perror("ERROR: accept");
return;
}
#ifdef SO_NOSIGPIPE
// Some environments (e.g. OS X) support turning off SIGPIPE for a socket
if (setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)) < 0)
LogMsg("%3d: WARNING: setsockopt - SO_NOSIGPIPE %d (%s)", sd, dnssd_errno, dnssd_strerror(dnssd_errno));
#endif
#if defined(_WIN32)
if (ioctlsocket(sd, FIONBIO, &optval) != 0)
#else
if (fcntl(sd, F_SETFL, fcntl(sd, F_GETFL, 0) | O_NONBLOCK) != 0)
#endif
{
my_perror("ERROR: fcntl(sd, F_SETFL, O_NONBLOCK) - aborting client");
dnssd_close(sd);
return;
}
else
{
request_state *request = NewRequest();
request->ts = t_morecoming;
request->sd = sd;
request->errsd = sd;
#if APPLE_OSX_mDNSResponder
struct xucred x;
socklen_t xucredlen = sizeof(x);
if (getsockopt(sd, 0, LOCAL_PEERCRED, &x, &xucredlen) >= 0 && x.cr_version == XUCRED_VERSION) request->uid = x.cr_uid;
else my_perror("ERROR: getsockopt, LOCAL_PEERCRED");
debugf("LOCAL_PEERCRED %d %u %u %d", xucredlen, x.cr_version, x.cr_uid, x.cr_ngroups);
#endif // APPLE_OSX_mDNSResponder
LogOperation("%3d: Adding FD for uid %u", request->sd, request->uid);
udsSupportAddFDToEventLoop(sd, request_callback, request, &request->platform_data);
}
}
mDNSlocal mDNSBool uds_socket_setup(dnssd_sock_t skt)
{
#if defined(SO_NP_EXTENSIONS)
struct so_np_extensions sonpx;
socklen_t optlen = sizeof(struct so_np_extensions);
sonpx.npx_flags = SONPX_SETOPTSHUT;
sonpx.npx_mask = SONPX_SETOPTSHUT;
if (setsockopt(skt, SOL_SOCKET, SO_NP_EXTENSIONS, &sonpx, optlen) < 0)
my_perror("WARNING: could not set sockopt - SO_NP_EXTENSIONS");
#endif
#if defined(_WIN32)
// SEH: do we even need to do this on windows?
// This socket will be given to WSAEventSelect which will automatically set it to non-blocking
u_long opt = 1;
if (ioctlsocket(skt, FIONBIO, &opt) != 0)
#else
if (fcntl(skt, F_SETFL, fcntl(skt, F_GETFL, 0) | O_NONBLOCK) != 0)
#endif
{
my_perror("ERROR: could not set listen socket to non-blocking mode");
return mDNSfalse;
}
if (listen(skt, LISTENQ) != 0)
{
my_perror("ERROR: could not listen on listen socket");
return mDNSfalse;
}
if (mStatus_NoError != udsSupportAddFDToEventLoop(skt, connect_callback, (void *) NULL, (void **) NULL))
{
my_perror("ERROR: could not add listen socket to event loop");
return mDNSfalse;
}
else LogOperation("%3d: Listening for incoming Unix Domain Socket client requests", skt);
return mDNStrue;
}
mDNSexport int udsserver_init(dnssd_sock_t skts[], mDNSu32 count)
{
dnssd_sockaddr_t laddr;
int ret;
mDNSu32 i = 0;
LogInfo("udsserver_init");
// If a particular platform wants to opt out of having a PID file, define PID_FILE to be ""
if (PID_FILE[0])
{
FILE *fp = fopen(PID_FILE, "w");
if (fp != NULL)
{
fprintf(fp, "%d\n", getpid());
fclose(fp);
}
}
if (skts)
{
for (i = 0; i < count; i++)
if (dnssd_SocketValid(skts[i]) && !uds_socket_setup(skts[i]))
goto error;
}
else
{
listenfd = socket(AF_DNSSD, SOCK_STREAM, 0);
if (!dnssd_SocketValid(listenfd))
{
my_perror("ERROR: socket(AF_DNSSD, SOCK_STREAM, 0); failed");
goto error;
}
mDNSPlatformMemZero(&laddr, sizeof(laddr));
#if defined(USE_TCP_LOOPBACK)
{
laddr.sin_family = AF_INET;
laddr.sin_port = htons(MDNS_TCP_SERVERPORT);
laddr.sin_addr.s_addr = inet_addr(MDNS_TCP_SERVERADDR);
ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr));
if (ret < 0)
{
my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed");
goto error;
}
}
#else
{
mode_t mask = umask(0);
unlink(MDNS_UDS_SERVERPATH); // OK if this fails
laddr.sun_family = AF_LOCAL;
#ifndef NOT_HAVE_SA_LEN
// According to Stevens (section 3.2), there is no portable way to
// determine whether sa_len is defined on a particular platform.
laddr.sun_len = sizeof(struct sockaddr_un);
#endif
if (strlen(MDNS_UDS_SERVERPATH) >= sizeof(laddr.sun_path))
{
LogMsg("ERROR: MDNS_UDS_SERVERPATH must be < %d characters", (int)sizeof(laddr.sun_path));
goto error;
}
mDNSPlatformStrCopy(laddr.sun_path, MDNS_UDS_SERVERPATH);
ret = bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr));
umask(mask);
if (ret < 0)
{
my_perror("ERROR: bind(listenfd, (struct sockaddr *) &laddr, sizeof(laddr)); failed");
goto error;
}
}
#endif
if (!uds_socket_setup(listenfd)) goto error;
}
#if !defined(PLATFORM_NO_RLIMIT)
{
// Set maximum number of open file descriptors
#define MIN_OPENFILES 10240
struct rlimit maxfds, newfds;
// Due to bugs in OS X (<rdar://problem/2941095>, <rdar://problem/3342704>, <rdar://problem/3839173>)
// you have to get and set rlimits once before getrlimit will return sensible values
if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; }
if (setrlimit(RLIMIT_NOFILE, &maxfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit");
if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; }
newfds.rlim_max = (maxfds.rlim_max > MIN_OPENFILES) ? maxfds.rlim_max : MIN_OPENFILES;
newfds.rlim_cur = (maxfds.rlim_cur > MIN_OPENFILES) ? maxfds.rlim_cur : MIN_OPENFILES;
if (newfds.rlim_max != maxfds.rlim_max || newfds.rlim_cur != maxfds.rlim_cur)
if (setrlimit(RLIMIT_NOFILE, &newfds) < 0) my_perror("ERROR: Unable to set maximum file descriptor limit");
if (getrlimit(RLIMIT_NOFILE, &maxfds) < 0) { my_perror("ERROR: Unable to get file descriptor limit"); return 0; }
debugf("maxfds.rlim_max %d", (long)maxfds.rlim_max);
debugf("maxfds.rlim_cur %d", (long)maxfds.rlim_cur);
}
#endif
// We start a "LocalOnly" query looking for Automatic Browse Domain records.
// When Domain Enumeration in uDNS.c finds an "lb" record from the network, its "FoundDomain" routine
// creates a "LocalOnly" record, which results in our AutomaticBrowseDomainChange callback being invoked
mDNS_GetDomains(&mDNSStorage, &mDNSStorage.AutomaticBrowseDomainQ, mDNS_DomainTypeBrowseAutomatic,
mDNSNULL, mDNSInterface_LocalOnly, AutomaticBrowseDomainChange, mDNSNULL);
// Add "local" as recommended registration domain ("dns-sd -E"), recommended browsing domain ("dns-sd -F"), and automatic browsing domain
RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeRegistration);
RegisterLocalOnlyDomainEnumPTR(&mDNSStorage, &localdomain, mDNS_DomainTypeBrowse);
AddAutoBrowseDomain(0, &localdomain);
udsserver_handle_configchange(&mDNSStorage);
return 0;
error:
my_perror("ERROR: udsserver_init");
return -1;
}
mDNSexport int udsserver_exit(void)
{
// Cancel all outstanding client requests
while (all_requests) AbortUnlinkAndFree(all_requests);
// Clean up any special mDNSInterface_LocalOnly records we created, both the entries for "local" we
// created in udsserver_init, and others we created as a result of reading local configuration data
while (LocalDomainEnumRecords)
{
ARListElem *rem = LocalDomainEnumRecords;
LocalDomainEnumRecords = LocalDomainEnumRecords->next;
mDNS_Deregister(&mDNSStorage, &rem->ar);
}
// If the launching environment created no listening socket,
// that means we created it ourselves, so we should clean it up on exit
if (dnssd_SocketValid(listenfd))
{
dnssd_close(listenfd);
#if !defined(USE_TCP_LOOPBACK)
// Currently, we're unable to remove /var/run/mdnsd because we've changed to userid "nobody"
// to give up unnecessary privilege, but we need to be root to remove this Unix Domain Socket.
// It would be nice if we could find a solution to this problem
if (unlink(MDNS_UDS_SERVERPATH))
debugf("Unable to remove %s", MDNS_UDS_SERVERPATH);
#endif
}
if (PID_FILE[0]) unlink(PID_FILE);
return 0;
}
mDNSlocal void LogClientInfo(mDNS *const m, const request_state *req)
{
char prefix[16];
if (req->primary) mDNS_snprintf(prefix, sizeof(prefix), " -> ");
else mDNS_snprintf(prefix, sizeof(prefix), "%3d:", req->sd);
usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
if (!req->terminate)
LogMsgNoIdent("%s No operation yet on this socket", prefix);
else if (req->terminate == connection_termination)
{
int num_records = 0, num_ops = 0;
const registered_record_entry *p;
const request_state *r;
for (p = req->u.reg_recs; p; p=p->next) num_records++;
for (r = req->next; r; r=r->next) if (r->primary == req) num_ops++;
LogMsgNoIdent("%s DNSServiceCreateConnection: %d registered record%s, %d kDNSServiceFlagsShareConnection operation%s", prefix,
num_records, num_records != 1 ? "s" : "",
num_ops, num_ops != 1 ? "s" : "");
for (p = req->u.reg_recs; p; p=p->next)
LogMsgNoIdent(" -> DNSServiceRegisterRecord %3d %s", p->key, ARDisplayString(m, p->rr));
for (r = req->next; r; r=r->next) if (r->primary == req) LogClientInfo(m, r);
}
else if (req->terminate == regservice_termination_callback)
{
service_instance *ptr;
for (ptr = req->u.servicereg.instances; ptr; ptr = ptr->next)
LogMsgNoIdent("%s DNSServiceRegister %##s %u/%u",
(ptr == req->u.servicereg.instances) ? prefix : " ",
ptr->srs.RR_SRV.resrec.name->c, mDNSVal16(req->u.servicereg.port), SRS_PORT(&ptr->srs));
}
else if (req->terminate == browse_termination_callback)
{
browser_t *blist;
for (blist = req->u.browser.browsers; blist; blist = blist->next)
LogMsgNoIdent("%s DNSServiceBrowse %##s", (blist == req->u.browser.browsers) ? prefix : " ", blist->q.qname.c);
}
else if (req->terminate == resolve_termination_callback)
LogMsgNoIdent("%s DNSServiceResolve %##s", prefix, req->u.resolve.qsrv.qname.c);
else if (req->terminate == queryrecord_termination_callback)
LogMsgNoIdent("%s DNSServiceQueryRecord %##s (%s)", prefix, req->u.queryrecord.q.qname.c, DNSTypeName(req->u.queryrecord.q.qtype));
else if (req->terminate == enum_termination_callback)
LogMsgNoIdent("%s DNSServiceEnumerateDomains %##s", prefix, req->u.enumeration.q_all.qname.c);
else if (req->terminate == port_mapping_termination_callback)
LogMsgNoIdent("%s DNSServiceNATPortMapping %.4a %s%s Int %d Req %d Ext %d Req TTL %d Granted TTL %d",
prefix,
&req->u.pm.NATinfo.ExternalAddress,
req->u.pm.NATinfo.Protocol & NATOp_MapTCP ? "TCP" : " ",
req->u.pm.NATinfo.Protocol & NATOp_MapUDP ? "UDP" : " ",
mDNSVal16(req->u.pm.NATinfo.IntPort),
mDNSVal16(req->u.pm.ReqExt),
mDNSVal16(req->u.pm.NATinfo.ExternalPort),
req->u.pm.NATinfo.NATLease,
req->u.pm.NATinfo.Lifetime);
else if (req->terminate == addrinfo_termination_callback)
LogMsgNoIdent("%s DNSServiceGetAddrInfo %s%s %##s", prefix,
req->u.addrinfo.protocol & kDNSServiceProtocol_IPv4 ? "v4" : " ",
req->u.addrinfo.protocol & kDNSServiceProtocol_IPv6 ? "v6" : " ",
req->u.addrinfo.q4.qname.c);
else
LogMsgNoIdent("%s Unrecognized operation %p", prefix, req->terminate);
}
mDNSlocal char *RecordTypeName(mDNSu8 rtype)
{
switch (rtype)
{
case kDNSRecordTypeUnregistered: return ("Unregistered ");
case kDNSRecordTypeDeregistering: return ("Deregistering");
case kDNSRecordTypeUnique: return ("Unique ");
case kDNSRecordTypeAdvisory: return ("Advisory ");
case kDNSRecordTypeShared: return ("Shared ");
case kDNSRecordTypeVerified: return ("Verified ");
case kDNSRecordTypeKnownUnique: return ("KnownUnique ");
default: return("Unknown");
}
}
mDNSlocal void LogEtcHosts(mDNS *const m)
{
mDNSBool showheader = mDNStrue;
const AuthRecord *ar;
mDNSu32 slot;
AuthGroup *ag;
int count = 0;
int authslot = 0;
mDNSBool truncated = 0;
for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
{
if (m->rrauth.rrauth_hash[slot]) authslot++;
for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next)
for (ar = ag->members; ar; ar = ar->next)
{
if (ar->RecordCallback != FreeEtcHosts) continue;
if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); }
// Print a maximum of 50 records
if (count++ >= 50) { truncated = mDNStrue; continue; }
if (ar->ARType == AuthRecordLocalOnly)
{
if (ar->resrec.InterfaceID == mDNSInterface_LocalOnly)
LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar));
else
{
mDNSu32 scopeid = (mDNSu32)(uintptr_t)ar->resrec.InterfaceID;
LogMsgNoIdent(" %s %u %s", RecordTypeName(ar->resrec.RecordType), scopeid, ARDisplayString(m, ar));
}
}
usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
}
}
if (showheader) LogMsgNoIdent("<None>");
else if (truncated) LogMsgNoIdent("<Truncated: to 50 records, Total records %d, Total Auth Groups %d, Auth Slots %d>", count, m->rrauth.rrauth_totalused, authslot);
}
mDNSlocal void LogLocalOnlyAuthRecords(mDNS *const m)
{
mDNSBool showheader = mDNStrue;
const AuthRecord *ar;
mDNSu32 slot;
AuthGroup *ag;
for (slot = 0; slot < AUTH_HASH_SLOTS; slot++)
{
for (ag = m->rrauth.rrauth_hash[slot]; ag; ag = ag->next)
for (ar = ag->members; ar; ar = ar->next)
{
if (ar->RecordCallback == FreeEtcHosts) continue;
if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" State Interface"); }
// Print a maximum of 400 records
if (ar->ARType == AuthRecordLocalOnly)
LogMsgNoIdent(" %s LO %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar));
else if (ar->ARType == AuthRecordP2P)
LogMsgNoIdent(" %s PP %s", RecordTypeName(ar->resrec.RecordType), ARDisplayString(m, ar));
usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
}
}
if (showheader) LogMsgNoIdent("<None>");
}
mDNSlocal void LogAuthRecords(mDNS *const m, const mDNSs32 now, AuthRecord *ResourceRecords, int *proxy)
{
mDNSBool showheader = mDNStrue;
const AuthRecord *ar;
OwnerOptData owner = zeroOwner;
for (ar = ResourceRecords; ar; ar=ar->next)
{
const char *const ifname = InterfaceNameForID(m, ar->resrec.InterfaceID);
if ((ar->WakeUp.HMAC.l[0] != 0) == (proxy != mDNSNULL))
{
if (showheader) { showheader = mDNSfalse; LogMsgNoIdent(" Int Next Expire State"); }
if (proxy) (*proxy)++;
if (!mDNSPlatformMemSame(&owner, &ar->WakeUp, sizeof(owner)))
{
owner = ar->WakeUp;
if (owner.password.l[0])
LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a Password %.6a seq %d", &owner.HMAC, &owner.IMAC, &owner.password, owner.seq);
else if (!mDNSSameEthAddress(&owner.HMAC, &owner.IMAC))
LogMsgNoIdent("Proxying for H-MAC %.6a I-MAC %.6a seq %d", &owner.HMAC, &owner.IMAC, owner.seq);
else
LogMsgNoIdent("Proxying for %.6a seq %d", &owner.HMAC, owner.seq);
}
if (AuthRecord_uDNS(ar))
LogMsgNoIdent("%7d %7d %7d %7d %s",
ar->ThisAPInterval / mDNSPlatformOneSecond,
(ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond,
ar->expire ? (ar->expire - now) / mDNSPlatformOneSecond : 0,
ar->state, ARDisplayString(m, ar));
else if (ar->ARType == AuthRecordLocalOnly)
LogMsgNoIdent(" LO %s", ARDisplayString(m, ar));
else if (ar->ARType == AuthRecordP2P)
LogMsgNoIdent(" PP %s", ARDisplayString(m, ar));
else
LogMsgNoIdent("%7d %7d %7d %7s %s",
ar->ThisAPInterval / mDNSPlatformOneSecond,
ar->AnnounceCount ? (ar->LastAPTime + ar->ThisAPInterval - now) / mDNSPlatformOneSecond : 0,
ar->TimeExpire ? (ar->TimeExpire - now) / mDNSPlatformOneSecond : 0,
ifname ? ifname : "ALL",
ARDisplayString(m, ar));
usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
}
}
if (showheader) LogMsgNoIdent("<None>");
}
mDNSexport void udsserver_info(mDNS *const m)
{
const mDNSs32 now = mDNS_TimeNow(m);
mDNSu32 CacheUsed = 0, CacheActive = 0, slot;
int ProxyA = 0, ProxyD = 0;
const CacheGroup *cg;
const CacheRecord *cr;
const DNSQuestion *q;
const DNameListElem *d;
const SearchListElem *s;
LogMsgNoIdent("Timenow 0x%08lX (%d)", (mDNSu32)now, now);
LogMsgNoIdent("------------ Cache -------------");
LogMsgNoIdent("Slt Q TTL if U Type rdlen");
for (slot = 0; slot < CACHE_HASH_SLOTS; slot++)
for (cg = m->rrcache_hash[slot]; cg; cg=cg->next)
{
CacheUsed++; // Count one cache entity for the CacheGroup object
for (cr = cg->members; cr; cr=cr->next)
{
const mDNSs32 remain = cr->resrec.rroriginalttl - (now - cr->TimeRcvd) / mDNSPlatformOneSecond;
const char *ifname;
mDNSInterfaceID InterfaceID = cr->resrec.InterfaceID;
if (!InterfaceID && cr->resrec.rDNSServer)
InterfaceID = cr->resrec.rDNSServer->interface;
ifname = InterfaceNameForID(m, InterfaceID);
CacheUsed++;
if (cr->CRActiveQuestion) CacheActive++;
LogMsgNoIdent("%3d %s%8ld %-7s%s %-6s%s",
slot,
cr->CRActiveQuestion ? "*" : " ",
remain,
ifname ? ifname : "-U-",
(cr->resrec.RecordType == kDNSRecordTypePacketNegative) ? "-" :
(cr->resrec.RecordType & kDNSRecordTypePacketUniqueMask) ? " " : "+",
DNSTypeName(cr->resrec.rrtype),
CRDisplayString(m, cr));
usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
}
}
if (m->rrcache_totalused != CacheUsed)
LogMsgNoIdent("Cache use mismatch: rrcache_totalused is %lu, true count %lu", m->rrcache_totalused, CacheUsed);
if (m->rrcache_active != CacheActive)
LogMsgNoIdent("Cache use mismatch: rrcache_active is %lu, true count %lu", m->rrcache_active, CacheActive);
LogMsgNoIdent("Cache currently contains %lu entities; %lu referenced by active questions", CacheUsed, CacheActive);
LogMsgNoIdent("--------- Auth Records ---------");
LogAuthRecords(m, now, m->ResourceRecords, mDNSNULL);
LogMsgNoIdent("--------- LocalOnly, P2P Auth Records ---------");
LogLocalOnlyAuthRecords(m);
LogMsgNoIdent("--------- /etc/hosts ---------");
LogEtcHosts(m);
LogMsgNoIdent("------ Duplicate Records -------");
LogAuthRecords(m, now, m->DuplicateRecords, mDNSNULL);
LogMsgNoIdent("----- Auth Records Proxied -----");
LogAuthRecords(m, now, m->ResourceRecords, &ProxyA);
LogMsgNoIdent("-- Duplicate Records Proxied ---");
LogAuthRecords(m, now, m->DuplicateRecords, &ProxyD);
LogMsgNoIdent("---------- Questions -----------");
if (!m->Questions) LogMsgNoIdent("<None>");
else
{
CacheUsed = 0;
CacheActive = 0;
LogMsgNoIdent(" Int Next if T NumAns VDNS Qptr DupOf SU SQ Type Name");
for (q = m->Questions; q; q=q->next)
{
mDNSs32 i = q->ThisQInterval / mDNSPlatformOneSecond;
mDNSs32 n = (NextQSendTime(q) - now) / mDNSPlatformOneSecond;
char *ifname = InterfaceNameForID(m, q->InterfaceID);
CacheUsed++;
if (q->ThisQInterval) CacheActive++;
LogMsgNoIdent("%6d%6d %-7s%s%s %5d 0x%x%x 0x%p 0x%p %1d %2d %-5s%##s%s",
i, n,
ifname ? ifname : mDNSOpaque16IsZero(q->TargetQID) ? "" : "-U-",
mDNSOpaque16IsZero(q->TargetQID) ? (q->LongLived ? "l" : " ") : (q->LongLived ? "L" : "O"),
PrivateQuery(q) ? "P" : " ",
q->CurrentAnswers, q->validDNSServers.l[1], q->validDNSServers.l[0], q, q->DuplicateOf,
q->SuppressUnusable, q->SuppressQuery, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : "");
usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
}
LogMsgNoIdent("%lu question%s; %lu active", CacheUsed, CacheUsed > 1 ? "s" : "", CacheActive);
}
LogMsgNoIdent("----- Local-Only Questions -----");
if (!m->LocalOnlyQuestions) LogMsgNoIdent("<None>");
else for (q = m->LocalOnlyQuestions; q; q=q->next)
LogMsgNoIdent(" %5d %-6s%##s%s",
q->CurrentAnswers, DNSTypeName(q->qtype), q->qname.c, q->DuplicateOf ? " (dup)" : "");
LogMsgNoIdent("---- Active Client Requests ----");
if (!all_requests) LogMsgNoIdent("<None>");
else
{
const request_state *req, *r;
for (req = all_requests; req; req=req->next)
{
if (req->primary) // If this is a subbordinate operation, check that the parent is in the list
{
for (r = all_requests; r && r != req; r=r->next) if (r == req->primary) goto foundparent;
LogMsgNoIdent("%3d: Orhpan operation %p; parent %p not found in request list", req->sd);
}
// For non-subbordinate operations, and subbordinate operations that have lost their parent, write out their info
LogClientInfo(m, req);
foundparent:;
}
}
LogMsgNoIdent("-------- NAT Traversals --------");
if (!m->NATTraversals) LogMsgNoIdent("<None>");
else
{
const NATTraversalInfo *nat;
for (nat = m->NATTraversals; nat; nat=nat->next)
{
if (nat->Protocol)
LogMsgNoIdent("%p %s Int %5d Ext %5d Err %d Retry %5d Interval %5d Expire %5d",
nat, nat->Protocol == NATOp_MapTCP ? "TCP" : "UDP",
mDNSVal16(nat->IntPort), mDNSVal16(nat->ExternalPort), nat->Result,
nat->retryPortMap ? (nat->retryPortMap - now) / mDNSPlatformOneSecond : 0,
nat->retryInterval / mDNSPlatformOneSecond,
nat->ExpiryTime ? (nat->ExpiryTime - now) / mDNSPlatformOneSecond : 0);
else
LogMsgNoIdent("%p Address Request Retry %5d Interval %5d", nat,
(m->retryGetAddr - now) / mDNSPlatformOneSecond,
m->retryIntervalGetAddr / mDNSPlatformOneSecond);
usleep((m->KnownBugs & mDNS_KnownBug_LossySyslog) ? 3333 : 1000);
}
}
LogMsgNoIdent("--------- AuthInfoList ---------");
if (!m->AuthInfoList) LogMsgNoIdent("<None>");
else
{
const DomainAuthInfo *a;
for (a = m->AuthInfoList; a; a = a->next)
LogMsgNoIdent("%##s %##s %##s %d %s", a->domain.c, a->keyname.c, a->hostname.c, (a->port.b[0] << 8 | a->port.b[1]), a->AutoTunnel ? a->AutoTunnel : "");
}
#if APPLE_OSX_mDNSResponder
LogMsgNoIdent("--------- TunnelClients --------");
if (!m->TunnelClients) LogMsgNoIdent("<None>");
else
{
const ClientTunnel *c;
for (c = m->TunnelClients; c; c = c->next)
LogMsgNoIdent("%s %##s local %.16a %.4a %.16a remote %.16a %.4a %5d %.16a interval %d",
c->prefix, c->dstname.c, &c->loc_inner, &c->loc_outer, &c->loc_outer6, &c->rmt_inner, &c->rmt_outer, mDNSVal16(c->rmt_outer_port), &c->rmt_outer6, c->q.ThisQInterval);
}
#endif // APPLE_OSX_mDNSResponder
LogMsgNoIdent("---------- Misc State ----------");
LogMsgNoIdent("PrimaryMAC: %.6a", &m->PrimaryMAC);
LogMsgNoIdent("m->SleepState %d (%s) seq %d",
m->SleepState,
m->SleepState == SleepState_Awake ? "Awake" :
m->SleepState == SleepState_Transferring ? "Transferring" :
m->SleepState == SleepState_Sleeping ? "Sleeping" : "?",
m->SleepSeqNum);
if (!m->SPSSocket) LogMsgNoIdent("Not offering Sleep Proxy Service");
else LogMsgNoIdent("Offering Sleep Proxy Service: %#s", m->SPSRecords.RR_SRV.resrec.name->c);
if (m->ProxyRecords == ProxyA + ProxyD) LogMsgNoIdent("ProxyRecords: %d + %d = %d", ProxyA, ProxyD, ProxyA + ProxyD);
else LogMsgNoIdent("ProxyRecords: MISMATCH %d + %d = %d ≠ %d", ProxyA, ProxyD, ProxyA + ProxyD, m->ProxyRecords);
LogMsgNoIdent("------ Auto Browse Domains -----");
if (!AutoBrowseDomains) LogMsgNoIdent("<None>");
else for (d=AutoBrowseDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c);
LogMsgNoIdent("--- Auto Registration Domains --");
if (!AutoRegistrationDomains) LogMsgNoIdent("<None>");
else for (d=AutoRegistrationDomains; d; d=d->next) LogMsgNoIdent("%##s", d->name.c);
LogMsgNoIdent("--- Search Domains --");
if (!SearchList) LogMsgNoIdent("<None>");
else
{
for (s=SearchList; s; s=s->next)
{
char *ifname = InterfaceNameForID(m, s->InterfaceID);
LogMsgNoIdent("%##s %s", s->domain.c, ifname ? ifname : "");
}
}
LogMsgNoIdent("---- Task Scheduling Timers ----");
if (!m->NewQuestions)
LogMsgNoIdent("NewQuestion <NONE>");
else
LogMsgNoIdent("NewQuestion DelayAnswering %d %d %##s (%s)",
m->NewQuestions->DelayAnswering, m->NewQuestions->DelayAnswering-now,
m->NewQuestions->qname.c, DNSTypeName(m->NewQuestions->qtype));
if (!m->NewLocalOnlyQuestions)
LogMsgNoIdent("NewLocalOnlyQuestions <NONE>");
else
LogMsgNoIdent("NewLocalOnlyQuestions %##s (%s)",
m->NewLocalOnlyQuestions->qname.c, DNSTypeName(m->NewLocalOnlyQuestions->qtype));
if (!m->NewLocalRecords)
LogMsgNoIdent("NewLocalRecords <NONE>");
else
LogMsgNoIdent("NewLocalRecords %02X %s", m->NewLocalRecords->resrec.RecordType, ARDisplayString(m, m->NewLocalRecords));
LogMsgNoIdent("SPSProxyListChanged%s", m->SPSProxyListChanged ? "" : " <NONE>");
LogMsgNoIdent("LocalRemoveEvents%s", m->LocalRemoveEvents ? "" : " <NONE>");
LogMsgNoIdent("m->RegisterAutoTunnel6 %08X", m->RegisterAutoTunnel6);
LogMsgNoIdent("m->AutoTunnelRelayAddrIn %.16a", &m->AutoTunnelRelayAddrIn);
LogMsgNoIdent("m->AutoTunnelRelayAddrOut %.16a", &m->AutoTunnelRelayAddrOut);
#define LogTimer(MSG,T) LogMsgNoIdent( MSG " %08X %11d %08X %11d", (T), (T), (T)-now, (T)-now)
LogMsgNoIdent(" ABS (hex) ABS (dec) REL (hex) REL (dec)");
LogMsgNoIdent("m->timenow %08X %11d", now, now);
LogMsgNoIdent("m->timenow_adjust %08X %11d", m->timenow_adjust, m->timenow_adjust);
LogTimer("m->NextScheduledEvent ", m->NextScheduledEvent);
#ifndef UNICAST_DISABLED
LogTimer("m->NextuDNSEvent ", m->NextuDNSEvent);
LogTimer("m->NextSRVUpdate ", m->NextSRVUpdate);
LogTimer("m->NextScheduledNATOp ", m->NextScheduledNATOp);
LogTimer("m->retryGetAddr ", m->retryGetAddr);
#endif
LogTimer("m->NextCacheCheck ", m->NextCacheCheck);
LogTimer("m->NextScheduledSPS ", m->NextScheduledSPS);
LogTimer("m->NextScheduledSPRetry ", m->NextScheduledSPRetry);
LogTimer("m->DelaySleep ", m->DelaySleep);
LogTimer("m->NextScheduledQuery ", m->NextScheduledQuery);
LogTimer("m->NextScheduledProbe ", m->NextScheduledProbe);
LogTimer("m->NextScheduledResponse", m->NextScheduledResponse);
LogTimer("m->SuppressSending ", m->SuppressSending);
LogTimer("m->SuppressProbes ", m->SuppressProbes);
LogTimer("m->ProbeFailTime ", m->ProbeFailTime);
LogTimer("m->DelaySleep ", m->DelaySleep);
LogTimer("m->SleepLimit ", m->SleepLimit);
LogTimer("m->NextScheduledStopTime ", m->NextScheduledStopTime);
}
#if APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
mDNSexport void uds_validatelists(void)
{
const request_state *req, *p;
for (req = all_requests; req; req=req->next)
{
if (req->next == (request_state *)~0 || (req->sd < 0 && req->sd != -2))
LogMemCorruption("UDS request list: %p is garbage (%d)", req, req->sd);
if (req->primary == req)
LogMemCorruption("UDS request list: req->primary should not point to self %p/%d", req, req->sd);
if (req->primary && req->replies)
LogMemCorruption("UDS request list: Subordinate request %p/%d/%p should not have replies (%p)",
req, req->sd, req->primary && req->replies);
p = req->primary;
if ((long)p & 3)
LogMemCorruption("UDS request list: req %p primary %p is misaligned (%d)", req, p, req->sd);
else if (p && (p->next == (request_state *)~0 || (p->sd < 0 && p->sd != -2)))
LogMemCorruption("UDS request list: req %p primary %p is garbage (%d)", req, p, p->sd);
reply_state *rep;
for (rep = req->replies; rep; rep=rep->next)
if (rep->next == (reply_state *)~0)
LogMemCorruption("UDS req->replies: %p is garbage", rep);
if (req->terminate == connection_termination)
{
registered_record_entry *r;
for (r = req->u.reg_recs; r; r=r->next)
if (r->next == (registered_record_entry *)~0)
LogMemCorruption("UDS req->u.reg_recs: %p is garbage", r);
}
else if (req->terminate == regservice_termination_callback)
{
service_instance *s;
for (s = req->u.servicereg.instances; s; s=s->next)
if (s->next == (service_instance *)~0)
LogMemCorruption("UDS req->u.servicereg.instances: %p is garbage", s);
}
else if (req->terminate == browse_termination_callback)
{
browser_t *b;
for (b = req->u.browser.browsers; b; b=b->next)
if (b->next == (browser_t *)~0)
LogMemCorruption("UDS req->u.browser.browsers: %p is garbage", b);
}
}
DNameListElem *d;
for (d = SCPrefBrowseDomains; d; d=d->next)
if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63)
LogMemCorruption("SCPrefBrowseDomains: %p is garbage (%d)", d, d->name.c[0]);
ARListElem *b;
for (b = LocalDomainEnumRecords; b; b=b->next)
if (b->next == (ARListElem *)~0 || b->ar.resrec.name->c[0] > 63)
LogMemCorruption("LocalDomainEnumRecords: %p is garbage (%d)", b, b->ar.resrec.name->c[0]);
for (d = AutoBrowseDomains; d; d=d->next)
if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63)
LogMemCorruption("AutoBrowseDomains: %p is garbage (%d)", d, d->name.c[0]);
for (d = AutoRegistrationDomains; d; d=d->next)
if (d->next == (DNameListElem *)~0 || d->name.c[0] > 63)
LogMemCorruption("AutoRegistrationDomains: %p is garbage (%d)", d, d->name.c[0]);
}
#endif // APPLE_OSX_mDNSResponder && MACOSX_MDNS_MALLOC_DEBUGGING
mDNSlocal int send_msg(request_state *const req)
{
reply_state *const rep = req->replies; // Send the first waiting reply
ssize_t nwriten;
if (req->no_reply) return(t_complete);
ConvertHeaderBytes(rep->mhdr);
nwriten = send(req->sd, (char *)&rep->mhdr + rep->nwriten, rep->totallen - rep->nwriten, 0);
ConvertHeaderBytes(rep->mhdr);
if (nwriten < 0)
{
if (dnssd_errno == dnssd_EINTR || dnssd_errno == dnssd_EWOULDBLOCK) nwriten = 0;
else
{
#if !defined(PLATFORM_NO_EPIPE)
if (dnssd_errno == EPIPE)
return(req->ts = t_terminated);
else
#endif
{
LogMsg("send_msg ERROR: failed to write %d of %d bytes to fd %d errno %d (%s)",
rep->totallen - rep->nwriten, rep->totallen, req->sd, dnssd_errno, dnssd_strerror(dnssd_errno));
return(t_error);
}
}
}
rep->nwriten += nwriten;
return (rep->nwriten == rep->totallen) ? t_complete : t_morecoming;
}
mDNSexport mDNSs32 udsserver_idle(mDNSs32 nextevent)
{
mDNSs32 now = mDNS_TimeNow(&mDNSStorage);
request_state **req = &all_requests;
while (*req)
{
request_state *const r = *req;
if (r->terminate == resolve_termination_callback)
if (r->u.resolve.ReportTime && now - r->u.resolve.ReportTime >= 0)
{
r->u.resolve.ReportTime = 0;
LogMsgNoIdent("Client application bug: DNSServiceResolve(%##s) active for over two minutes. "
"This places considerable burden on the network.", r->u.resolve.qsrv.qname.c);
}
// Note: Only primary req's have reply lists, not subordinate req's.
while (r->replies) // Send queued replies
{
transfer_state result;
if (r->replies->next) r->replies->rhdr->flags |= dnssd_htonl(kDNSServiceFlagsMoreComing);
result = send_msg(r); // Returns t_morecoming if buffer full because client is not reading
if (result == t_complete)
{
reply_state *fptr = r->replies;
r->replies = r->replies->next;
freeL("reply_state/udsserver_idle", fptr);
r->time_blocked = 0; // reset failure counter after successful send
r->unresponsiveness_reports = 0;
continue;
}
else if (result == t_terminated || result == t_error)
{
LogMsg("%3d: Could not write data to client because of error - aborting connection", r->sd);
LogClientInfo(&mDNSStorage, r);
abort_request(r);
}
break;
}
if (r->replies) // If we failed to send everything, check our time_blocked timer
{
if (nextevent - now > mDNSPlatformOneSecond) nextevent = now + mDNSPlatformOneSecond;
if (mDNSStorage.SleepState != SleepState_Awake) r->time_blocked = 0;
else if (!r->time_blocked) r->time_blocked = NonZeroTime(now);
else if (now - r->time_blocked >= 10 * mDNSPlatformOneSecond * (r->unresponsiveness_reports+1))
{
int num = 0;
struct reply_state *x = r->replies;
while (x) { num++; x=x->next; }
LogMsg("%3d: Could not write data to client after %ld seconds, %d repl%s waiting",
r->sd, (now - r->time_blocked) / mDNSPlatformOneSecond, num, num == 1 ? "y" : "ies");
if (++r->unresponsiveness_reports >= 60)
{
LogMsg("%3d: Client unresponsive; aborting connection", r->sd);
LogClientInfo(&mDNSStorage, r);
abort_request(r);
}
}
}
if (!dnssd_SocketValid(r->sd)) // If this request is finished, unlink it from the list and free the memory
{
// Since we're already doing a list traversal, we unlink the request directly instead of using AbortUnlinkAndFree()
*req = r->next;
freeL("request_state/udsserver_idle", r);
}
else
req = &r->next;
}
return nextevent;
}
struct CompileTimeAssertionChecks_uds_daemon
{
// Check our structures are reasonable sizes. Including overly-large buffers, or embedding
// other overly-large structures instead of having a pointer to them, can inadvertently
// cause structure sizes (and therefore memory usage) to balloon unreasonably.
char sizecheck_request_state [(sizeof(request_state) <= 1784) ? 1 : -1];
char sizecheck_registered_record_entry[(sizeof(registered_record_entry) <= 60) ? 1 : -1];
char sizecheck_service_instance [(sizeof(service_instance) <= 6552) ? 1 : -1];
char sizecheck_browser_t [(sizeof(browser_t) <= 1050) ? 1 : -1];
char sizecheck_reply_hdr [(sizeof(reply_hdr) <= 12) ? 1 : -1];
char sizecheck_reply_state [(sizeof(reply_state) <= 64) ? 1 : -1];
};