/* $NetBSD: ns_print.c,v 1.5 2004/11/07 02:19:49 christos Exp $ */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
#ifndef lint
#ifdef notdef
static const char rcsid[] = "Id: ns_print.c,v 1.3.2.1.4.5 2004/07/28 20:16:45 marka Exp";
#else
__RCSID("$NetBSD: ns_print.c,v 1.5 2004/11/07 02:19:49 christos Exp $");
#endif
#endif
/* Import. */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "arpa_nameser.h"
#include <arpa/inet.h>
#include <isc/assertions.h>
#include <isc/dst.h>
#include <errno.h>
#ifdef ANDROID_CHANGES
#include "resolv_private.h"
#else
#include <resolv.h>
#endif
#include <string.h>
#include <ctype.h>
#include <assert.h>
#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif
#ifndef MIN
#define MIN(x,y) ((x)<(y)?(x):(y))
#endif
/* Forward. */
static size_t prune_origin(const char *name, const char *origin);
static int charstr(const u_char *rdata, const u_char *edata,
char **buf, size_t *buflen);
static int addname(const u_char *msg, size_t msglen,
const u_char **p, const char *origin,
char **buf, size_t *buflen);
static void addlen(size_t len, char **buf, size_t *buflen);
static int addstr(const char *src, size_t len,
char **buf, size_t *buflen);
static int addtab(size_t len, size_t target, int spaced,
char **buf, size_t *buflen);
/* Macros. */
#define T(x) \
do { \
if ((x) < 0) \
return (-1); \
} while (/*CONSTCOND*/0)
/* Public. */
/*
* int
* ns_sprintrr(handle, rr, name_ctx, origin, buf, buflen)
* Convert an RR to presentation format.
* return:
* Number of characters written to buf, or -1 (check errno).
*/
int
ns_sprintrr(const ns_msg *handle, const ns_rr *rr,
const char *name_ctx, const char *origin,
char *buf, size_t buflen)
{
int n;
n = ns_sprintrrf(ns_msg_base(*handle), ns_msg_size(*handle),
ns_rr_name(*rr), ns_rr_class(*rr), ns_rr_type(*rr),
ns_rr_ttl(*rr), ns_rr_rdata(*rr), ns_rr_rdlen(*rr),
name_ctx, origin, buf, buflen);
return (n);
}
/*
* int
* ns_sprintrrf(msg, msglen, name, class, type, ttl, rdata, rdlen,
* name_ctx, origin, buf, buflen)
* Convert the fields of an RR into presentation format.
* return:
* Number of characters written to buf, or -1 (check errno).
*/
int
ns_sprintrrf(const u_char *msg, size_t msglen,
const char *name, ns_class class, ns_type type,
u_long ttl, const u_char *rdata, size_t rdlen,
const char *name_ctx, const char *origin,
char *buf, size_t buflen)
{
const char *obuf = buf;
const u_char *edata = rdata + rdlen;
int spaced = 0;
const char *comment;
char tmp[100];
int len, x;
/*
* Owner.
*/
if (name_ctx != NULL && ns_samename(name_ctx, name) == 1) {
T(addstr("\t\t\t", (size_t)3, &buf, &buflen));
} else {
len = prune_origin(name, origin);
if (*name == '\0') {
goto root;
} else if (len == 0) {
T(addstr("@\t\t\t", (size_t)4, &buf, &buflen));
} else {
T(addstr(name, (size_t)len, &buf, &buflen));
/* Origin not used or not root, and no trailing dot? */
if (((origin == NULL || origin[0] == '\0') ||
(origin[0] != '.' && origin[1] != '\0' &&
name[len] == '\0')) && name[len - 1] != '.') {
root:
T(addstr(".", (size_t)1, &buf, &buflen));
len++;
}
T(spaced = addtab((size_t)len, 24, spaced, &buf, &buflen));
}
}
/*
* TTL, Class, Type.
*/
T(x = ns_format_ttl(ttl, buf, buflen));
addlen((size_t)x, &buf, &buflen);
len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
T(addstr(tmp, (size_t)len, &buf, &buflen));
T(spaced = addtab((size_t)(x + len), (size_t)16, spaced, &buf, &buflen));
/*
* RData.
*/
switch (type) {
case ns_t_a:
if (rdlen != (size_t)NS_INADDRSZ)
goto formerr;
(void) inet_ntop(AF_INET, rdata, buf, buflen);
addlen(strlen(buf), &buf, &buflen);
break;
case ns_t_cname:
case ns_t_mb:
case ns_t_mg:
case ns_t_mr:
case ns_t_ns:
case ns_t_ptr:
case ns_t_dname:
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
break;
case ns_t_hinfo:
case ns_t_isdn:
/* First word. */
T(len = charstr(rdata, edata, &buf, &buflen));
if (len == 0)
goto formerr;
rdata += len;
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Second word, optional in ISDN records. */
if (type == ns_t_isdn && rdata == edata)
break;
T(len = charstr(rdata, edata, &buf, &buflen));
if (len == 0)
goto formerr;
rdata += len;
break;
case ns_t_soa: {
u_long t;
/* Server name. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Administrator name. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
T(addstr(" (\n", (size_t)3, &buf, &buflen));
spaced = 0;
if ((edata - rdata) != 5*NS_INT32SZ)
goto formerr;
/* Serial number. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
T(addstr("\t\t\t\t\t", (size_t)5, &buf, &buflen));
len = SPRINTF((tmp, "%lu", t));
T(addstr(tmp, (size_t)len, &buf, &buflen));
T(spaced = addtab((size_t)len, (size_t)16, spaced, &buf, &buflen));
T(addstr("; serial\n", (size_t)9, &buf, &buflen));
spaced = 0;
/* Refresh interval. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
T(addstr("\t\t\t\t\t", (size_t)5, &buf, &buflen));
T(len = ns_format_ttl(t, buf, buflen));
addlen((size_t)len, &buf, &buflen);
T(spaced = addtab((size_t)len, (size_t)16, spaced, &buf, &buflen));
T(addstr("; refresh\n", (size_t)10, &buf, &buflen));
spaced = 0;
/* Retry interval. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
T(addstr("\t\t\t\t\t", (size_t)5, &buf, &buflen));
T(len = ns_format_ttl(t, buf, buflen));
addlen((size_t)len, &buf, &buflen);
T(spaced = addtab((size_t)len, (size_t)16, spaced, &buf, &buflen));
T(addstr("; retry\n", (size_t)8, &buf, &buflen));
spaced = 0;
/* Expiry. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
T(addstr("\t\t\t\t\t", (size_t)5, &buf, &buflen));
T(len = ns_format_ttl(t, buf, buflen));
addlen((size_t)len, &buf, &buflen);
T(spaced = addtab((size_t)len, (size_t)16, spaced, &buf, &buflen));
T(addstr("; expiry\n", (size_t)9, &buf, &buflen));
spaced = 0;
/* Minimum TTL. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
T(addstr("\t\t\t\t\t", (size_t)5, &buf, &buflen));
T(len = ns_format_ttl(t, buf, buflen));
addlen((size_t)len, &buf, &buflen);
T(addstr(" )", (size_t)2, &buf, &buflen));
T(spaced = addtab((size_t)len, (size_t)16, spaced, &buf, &buflen));
T(addstr("; minimum\n", (size_t)10, &buf, &buflen));
break;
}
case ns_t_mx:
case ns_t_afsdb:
case ns_t_rt: {
u_int t;
if (rdlen < (size_t)NS_INT16SZ)
goto formerr;
/* Priority. */
t = ns_get16(rdata);
rdata += NS_INT16SZ;
len = SPRINTF((tmp, "%u ", t));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Target. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
break;
}
case ns_t_px: {
u_int t;
if (rdlen < (size_t)NS_INT16SZ)
goto formerr;
/* Priority. */
t = ns_get16(rdata);
rdata += NS_INT16SZ;
len = SPRINTF((tmp, "%u ", t));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Name1. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Name2. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
break;
}
case ns_t_x25:
T(len = charstr(rdata, edata, &buf, &buflen));
if (len == 0)
goto formerr;
rdata += len;
break;
case ns_t_txt:
while (rdata < edata) {
T(len = charstr(rdata, edata, &buf, &buflen));
if (len == 0)
goto formerr;
rdata += len;
if (rdata < edata)
T(addstr(" ", (size_t)1, &buf, &buflen));
}
break;
case ns_t_nsap: {
char t[2+255*3];
(void) inet_nsap_ntoa((int)rdlen, rdata, t);
T(addstr(t, strlen(t), &buf, &buflen));
break;
}
case ns_t_aaaa:
if (rdlen != (size_t)NS_IN6ADDRSZ)
goto formerr;
(void) inet_ntop(AF_INET6, rdata, buf, buflen);
addlen(strlen(buf), &buf, &buflen);
break;
case ns_t_loc: {
char t[255];
/* XXX protocol format checking? */
(void) loc_ntoa(rdata, t);
T(addstr(t, strlen(t), &buf, &buflen));
break;
}
case ns_t_naptr: {
u_int order, preference;
char t[50];
if (rdlen < 2U*NS_INT16SZ)
goto formerr;
/* Order, Precedence. */
order = ns_get16(rdata); rdata += NS_INT16SZ;
preference = ns_get16(rdata); rdata += NS_INT16SZ;
len = SPRINTF((t, "%u %u ", order, preference));
T(addstr(t, (size_t)len, &buf, &buflen));
/* Flags. */
T(len = charstr(rdata, edata, &buf, &buflen));
if (len == 0)
goto formerr;
rdata += len;
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Service. */
T(len = charstr(rdata, edata, &buf, &buflen));
if (len == 0)
goto formerr;
rdata += len;
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Regexp. */
T(len = charstr(rdata, edata, &buf, &buflen));
if (len < 0)
return (-1);
if (len == 0)
goto formerr;
rdata += len;
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Server. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
break;
}
case ns_t_srv: {
u_int priority, weight, port;
char t[50];
if (rdlen < 3U*NS_INT16SZ)
goto formerr;
/* Priority, Weight, Port. */
priority = ns_get16(rdata); rdata += NS_INT16SZ;
weight = ns_get16(rdata); rdata += NS_INT16SZ;
port = ns_get16(rdata); rdata += NS_INT16SZ;
len = SPRINTF((t, "%u %u %u ", priority, weight, port));
T(addstr(t, (size_t)len, &buf, &buflen));
/* Server. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
break;
}
case ns_t_minfo:
case ns_t_rp:
/* Name1. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Name2. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
break;
case ns_t_wks: {
int n, lcnt;
if (rdlen < 1U + NS_INT32SZ)
goto formerr;
/* Address. */
(void) inet_ntop(AF_INET, rdata, buf, buflen);
addlen(strlen(buf), &buf, &buflen);
rdata += NS_INADDRSZ;
/* Protocol. */
len = SPRINTF((tmp, " %u ( ", *rdata));
T(addstr(tmp, (size_t)len, &buf, &buflen));
rdata += NS_INT8SZ;
/* Bit map. */
n = 0;
lcnt = 0;
while (rdata < edata) {
u_int c = *rdata++;
do {
if (c & 0200) {
if (lcnt == 0) {
T(addstr("\n\t\t\t\t", (size_t)5,
&buf, &buflen));
lcnt = 10;
spaced = 0;
}
len = SPRINTF((tmp, "%d ", n));
T(addstr(tmp, (size_t)len, &buf, &buflen));
lcnt--;
}
c <<= 1;
} while (++n & 07);
}
T(addstr(")", (size_t)1, &buf, &buflen));
break;
}
case ns_t_key: {
char base64_key[NS_MD5RSA_MAX_BASE64];
u_int keyflags, protocol, algorithm, key_id;
const char *leader;
int n;
if (rdlen < 0U + NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)
goto formerr;
/* Key flags, Protocol, Algorithm. */
#ifndef _LIBC
key_id = dst_s_dns_key_id(rdata, edata-rdata);
#else
key_id = 0;
#endif
keyflags = ns_get16(rdata); rdata += NS_INT16SZ;
protocol = *rdata++;
algorithm = *rdata++;
len = SPRINTF((tmp, "0x%04x %u %u",
keyflags, protocol, algorithm));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Public key data. */
len = b64_ntop(rdata, (size_t)(edata - rdata),
base64_key, sizeof base64_key);
if (len < 0)
goto formerr;
if (len > 15) {
T(addstr(" (", (size_t)2, &buf, &buflen));
leader = "\n\t\t";
spaced = 0;
} else
leader = " ";
for (n = 0; n < len; n += 48) {
T(addstr(leader, strlen(leader), &buf, &buflen));
T(addstr(base64_key + n, (size_t)MIN(len - n, 48),
&buf, &buflen));
}
if (len > 15)
T(addstr(" )", (size_t)2, &buf, &buflen));
n = SPRINTF((tmp, " ; key_tag= %u", key_id));
T(addstr(tmp, (size_t)n, &buf, &buflen));
break;
}
case ns_t_sig: {
char base64_key[NS_MD5RSA_MAX_BASE64];
u_int typ, algorithm, labels, footprint;
const char *leader;
u_long t;
int n;
if (rdlen < 22U)
goto formerr;
/* Type covered, Algorithm, Label count, Original TTL. */
typ = ns_get16(rdata); rdata += NS_INT16SZ;
algorithm = *rdata++;
labels = *rdata++;
t = ns_get32(rdata); rdata += NS_INT32SZ;
len = SPRINTF((tmp, "%s %d %d %lu ",
p_type((int)typ), algorithm, labels, t));
T(addstr(tmp, (size_t)len, &buf, &buflen));
if (labels > (u_int)dn_count_labels(name))
goto formerr;
/* Signature expiry. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
len = SPRINTF((tmp, "%s ", p_secstodate(t)));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Time signed. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
len = SPRINTF((tmp, "%s ", p_secstodate(t)));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Signature Footprint. */
footprint = ns_get16(rdata); rdata += NS_INT16SZ;
len = SPRINTF((tmp, "%u ", footprint));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Signer's name. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
/* Signature. */
len = b64_ntop(rdata, (size_t)(edata - rdata),
base64_key, sizeof base64_key);
if (len > 15) {
T(addstr(" (", (size_t)2, &buf, &buflen));
leader = "\n\t\t";
spaced = 0;
} else
leader = " ";
if (len < 0)
goto formerr;
for (n = 0; n < len; n += 48) {
T(addstr(leader, strlen(leader), &buf, &buflen));
T(addstr(base64_key + n, (size_t)MIN(len - n, 48),
&buf, &buflen));
}
if (len > 15)
T(addstr(" )", (size_t)2, &buf, &buflen));
break;
}
case ns_t_nxt: {
int n, c;
/* Next domain name. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
/* Type bit map. */
n = edata - rdata;
for (c = 0; c < n*8; c++)
if (NS_NXT_BIT_ISSET(c, rdata)) {
len = SPRINTF((tmp, " %s", p_type(c)));
T(addstr(tmp, (size_t)len, &buf, &buflen));
}
break;
}
case ns_t_cert: {
u_int c_type, key_tag, alg;
int n;
unsigned int siz;
char base64_cert[8192], tmp1[40];
const char *leader;
c_type = ns_get16(rdata); rdata += NS_INT16SZ;
key_tag = ns_get16(rdata); rdata += NS_INT16SZ;
alg = (u_int) *rdata++;
len = SPRINTF((tmp1, "%d %d %d ", c_type, key_tag, alg));
T(addstr(tmp1, (size_t)len, &buf, &buflen));
siz = (edata-rdata)*4/3 + 4; /* "+4" accounts for trailing \0 */
if (siz > sizeof(base64_cert) * 3/4) {
const char *str = "record too long to print";
T(addstr(str, strlen(str), &buf, &buflen));
}
else {
len = b64_ntop(rdata, (size_t)(edata-rdata),
base64_cert, siz);
if (len < 0)
goto formerr;
else if (len > 15) {
T(addstr(" (", (size_t)2, &buf, &buflen));
leader = "\n\t\t";
spaced = 0;
}
else
leader = " ";
for (n = 0; n < len; n += 48) {
T(addstr(leader, strlen(leader),
&buf, &buflen));
T(addstr(base64_cert + n, (size_t)MIN(len - n, 48),
&buf, &buflen));
}
if (len > 15)
T(addstr(" )", (size_t)2, &buf, &buflen));
}
break;
}
case ns_t_tkey: {
/* KJD - need to complete this */
u_long t;
int mode, err, keysize;
/* Algorithm name. */
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
T(addstr(" ", (size_t)1, &buf, &buflen));
/* Inception. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
len = SPRINTF((tmp, "%s ", p_secstodate(t)));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Experation. */
t = ns_get32(rdata); rdata += NS_INT32SZ;
len = SPRINTF((tmp, "%s ", p_secstodate(t)));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* Mode , Error, Key Size. */
/* Priority, Weight, Port. */
mode = ns_get16(rdata); rdata += NS_INT16SZ;
err = ns_get16(rdata); rdata += NS_INT16SZ;
keysize = ns_get16(rdata); rdata += NS_INT16SZ;
len = SPRINTF((tmp, "%u %u %u ", mode, err, keysize));
T(addstr(tmp, (size_t)len, &buf, &buflen));
/* XXX need to dump key, print otherdata length & other data */
break;
}
case ns_t_tsig: {
/* BEW - need to complete this */
int n;
T(len = addname(msg, msglen, &rdata, origin, &buf, &buflen));
T(addstr(" ", (size_t)1, &buf, &buflen));
rdata += 8; /* time */
n = ns_get16(rdata); rdata += INT16SZ;
rdata += n; /* sig */
n = ns_get16(rdata); rdata += INT16SZ; /* original id */
sprintf(buf, "%d", ns_get16(rdata));
rdata += INT16SZ;
addlen(strlen(buf), &buf, &buflen);
break;
}
case ns_t_a6: {
struct in6_addr a;
int pbyte, pbit;
/* prefix length */
if (rdlen == 0U) goto formerr;
len = SPRINTF((tmp, "%d ", *rdata));
T(addstr(tmp, (size_t)len, &buf, &buflen));
pbit = *rdata;
if (pbit > 128) goto formerr;
pbyte = (pbit & ~7) / 8;
rdata++;
/* address suffix: provided only when prefix len != 128 */
if (pbit < 128) {
if (rdata + pbyte >= edata) goto formerr;
memset(&a, 0, sizeof(a));
memcpy(&a.s6_addr[pbyte], rdata, sizeof(a) - pbyte);
(void) inet_ntop(AF_INET6, &a, buf, buflen);
addlen(strlen(buf), &buf, &buflen);
rdata += sizeof(a) - pbyte;
}
/* prefix name: provided only when prefix len > 0 */
if (pbit == 0)
break;
if (rdata >= edata) goto formerr;
T(addstr(" ", (size_t)1, &buf, &buflen));
T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
break;
}
case ns_t_opt: {
len = SPRINTF((tmp, "%u bytes", class));
T(addstr(tmp, (size_t)len, &buf, &buflen));
break;
}
default:
comment = "unknown RR type";
goto hexify;
}
return (buf - obuf);
formerr:
comment = "RR format error";
hexify: {
int n, m;
char *p;
len = SPRINTF((tmp, "\\# %tu%s\t; %s", edata - rdata,
rdlen != 0 ? " (" : "", comment));
T(addstr(tmp, (size_t)len, &buf, &buflen));
while (rdata < edata) {
p = tmp;
p += SPRINTF((p, "\n\t"));
spaced = 0;
n = MIN(16, edata - rdata);
for (m = 0; m < n; m++)
p += SPRINTF((p, "%02x ", rdata[m]));
T(addstr(tmp, (size_t)(p - tmp), &buf, &buflen));
if (n < 16) {
T(addstr(")", (size_t)1, &buf, &buflen));
T(addtab((size_t)(p - tmp + 1), (size_t)48, spaced, &buf, &buflen));
}
p = tmp;
p += SPRINTF((p, "; "));
for (m = 0; m < n; m++)
*p++ = (isascii(rdata[m]) && isprint(rdata[m]))
? rdata[m]
: '.';
T(addstr(tmp, (size_t)(p - tmp), &buf, &buflen));
rdata += n;
}
return (buf - obuf);
}
}
/* Private. */
/*
* size_t
* prune_origin(name, origin)
* Find out if the name is at or under the current origin.
* return:
* Number of characters in name before start of origin,
* or length of name if origin does not match.
* notes:
* This function should share code with samedomain().
*/
static size_t
prune_origin(const char *name, const char *origin) {
const char *oname = name;
while (*name != '\0') {
if (origin != NULL && ns_samename(name, origin) == 1)
return (name - oname - (name > oname));
while (*name != '\0') {
if (*name == '\\') {
name++;
/* XXX need to handle \nnn form. */
if (*name == '\0')
break;
} else if (*name == '.') {
name++;
break;
}
name++;
}
}
return (name - oname);
}
/*
* int
* charstr(rdata, edata, buf, buflen)
* Format a <character-string> into the presentation buffer.
* return:
* Number of rdata octets consumed
* 0 for protocol format error
* -1 for output buffer error
* side effects:
* buffer is advanced on success.
*/
static int
charstr(const u_char *rdata, const u_char *edata, char **buf, size_t *buflen) {
const u_char *odata = rdata;
size_t save_buflen = *buflen;
char *save_buf = *buf;
if (addstr("\"", (size_t)1, buf, buflen) < 0)
goto enospc;
if (rdata < edata) {
int n = *rdata;
if (rdata + 1 + n <= edata) {
rdata++;
while (n-- > 0) {
if (strchr("\n\"\\", *rdata) != NULL)
if (addstr("\\", (size_t)1, buf, buflen) < 0)
goto enospc;
if (addstr((const char *)rdata, (size_t)1,
buf, buflen) < 0)
goto enospc;
rdata++;
}
}
}
if (addstr("\"", (size_t)1, buf, buflen) < 0)
goto enospc;
return (rdata - odata);
enospc:
errno = ENOSPC;
*buf = save_buf;
*buflen = save_buflen;
return (-1);
}
static int
addname(const u_char *msg, size_t msglen,
const u_char **pp, const char *origin,
char **buf, size_t *buflen)
{
size_t newlen, save_buflen = *buflen;
char *save_buf = *buf;
int n;
n = dn_expand(msg, msg + msglen, *pp, *buf, (int)*buflen);
if (n < 0)
goto enospc; /* Guess. */
newlen = prune_origin(*buf, origin);
if (**buf == '\0') {
goto root;
} else if (newlen == 0U) {
/* Use "@" instead of name. */
if (newlen + 2 > *buflen)
goto enospc; /* No room for "@\0". */
(*buf)[newlen++] = '@';
(*buf)[newlen] = '\0';
} else {
if (((origin == NULL || origin[0] == '\0') ||
(origin[0] != '.' && origin[1] != '\0' &&
(*buf)[newlen] == '\0')) && (*buf)[newlen - 1] != '.') {
/* No trailing dot. */
root:
if (newlen + 2 > *buflen)
goto enospc; /* No room for ".\0". */
(*buf)[newlen++] = '.';
(*buf)[newlen] = '\0';
}
}
*pp += n;
addlen(newlen, buf, buflen);
**buf = '\0';
return (newlen);
enospc:
errno = ENOSPC;
*buf = save_buf;
*buflen = save_buflen;
return (-1);
}
static void
addlen(size_t len, char **buf, size_t *buflen) {
assert(len <= *buflen);
*buf += len;
*buflen -= len;
}
static int
addstr(const char *src, size_t len, char **buf, size_t *buflen) {
if (len >= *buflen) {
errno = ENOSPC;
return (-1);
}
memcpy(*buf, src, len);
addlen(len, buf, buflen);
**buf = '\0';
return (0);
}
static int
addtab(size_t len, size_t target, int spaced, char **buf, size_t *buflen) {
size_t save_buflen = *buflen;
char *save_buf = *buf;
int t;
if (spaced || len >= target - 1) {
T(addstr(" ", (size_t)2, buf, buflen));
spaced = 1;
} else {
for (t = (target - len - 1) / 8; t >= 0; t--)
if (addstr("\t", (size_t)1, buf, buflen) < 0) {
*buflen = save_buflen;
*buf = save_buf;
return (-1);
}
spaced = 0;
}
return (spaced);
}