// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/net_util.h"
#include <errno.h>
#include <string.h>
#include <algorithm>
#include <iterator>
#include <set>
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#include <iphlpapi.h>
#include <winsock2.h>
#include <ws2bth.h>
#pragma comment(lib, "iphlpapi.lib")
#elif defined(OS_POSIX)
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <unistd.h>
#if !defined(OS_NACL)
#include <net/if.h>
#if !defined(OS_ANDROID)
#include <ifaddrs.h>
#endif // !defined(OS_NACL)
#endif // !defined(OS_ANDROID)
#endif // defined(OS_POSIX)
#include "base/basictypes.h"
#include "base/json/string_escape.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/sys_byteorder.h"
#include "base/values.h"
#include "url/gurl.h"
#include "url/url_canon.h"
#include "url/url_canon_ip.h"
#include "url/url_parse.h"
#include "net/base/dns_util.h"
#include "net/base/net_module.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "net/grit/net_resources.h"
#include "net/http/http_content_disposition.h"
#if defined(OS_ANDROID)
#include "net/android/network_library.h"
#endif
#if defined(OS_WIN)
#include "net/base/winsock_init.h"
#endif
namespace net {
namespace {
// The general list of blocked ports. Will be blocked unless a specific
// protocol overrides it. (Ex: ftp can use ports 20 and 21)
static const int kRestrictedPorts[] = {
1, // tcpmux
7, // echo
9, // discard
11, // systat
13, // daytime
15, // netstat
17, // qotd
19, // chargen
20, // ftp data
21, // ftp access
22, // ssh
23, // telnet
25, // smtp
37, // time
42, // name
43, // nicname
53, // domain
77, // priv-rjs
79, // finger
87, // ttylink
95, // supdup
101, // hostriame
102, // iso-tsap
103, // gppitnp
104, // acr-nema
109, // pop2
110, // pop3
111, // sunrpc
113, // auth
115, // sftp
117, // uucp-path
119, // nntp
123, // NTP
135, // loc-srv /epmap
139, // netbios
143, // imap2
179, // BGP
389, // ldap
465, // smtp+ssl
512, // print / exec
513, // login
514, // shell
515, // printer
526, // tempo
530, // courier
531, // chat
532, // netnews
540, // uucp
556, // remotefs
563, // nntp+ssl
587, // stmp?
601, // ??
636, // ldap+ssl
993, // ldap+ssl
995, // pop3+ssl
2049, // nfs
3659, // apple-sasl / PasswordServer
4045, // lockd
6000, // X11
6665, // Alternate IRC [Apple addition]
6666, // Alternate IRC [Apple addition]
6667, // Standard IRC [Apple addition]
6668, // Alternate IRC [Apple addition]
6669, // Alternate IRC [Apple addition]
0xFFFF, // Used to block all invalid port numbers (see
// third_party/WebKit/Source/platform/weborigin/KURL.cpp,
// KURL::port())
};
// FTP overrides the following restricted ports.
static const int kAllowedFtpPorts[] = {
21, // ftp data
22, // ssh
};
bool IPNumberPrefixCheck(const IPAddressNumber& ip_number,
const unsigned char* ip_prefix,
size_t prefix_length_in_bits) {
// Compare all the bytes that fall entirely within the prefix.
int num_entire_bytes_in_prefix = prefix_length_in_bits / 8;
for (int i = 0; i < num_entire_bytes_in_prefix; ++i) {
if (ip_number[i] != ip_prefix[i])
return false;
}
// In case the prefix was not a multiple of 8, there will be 1 byte
// which is only partially masked.
int remaining_bits = prefix_length_in_bits % 8;
if (remaining_bits != 0) {
unsigned char mask = 0xFF << (8 - remaining_bits);
int i = num_entire_bytes_in_prefix;
if ((ip_number[i] & mask) != (ip_prefix[i] & mask))
return false;
}
return true;
}
} // namespace
static base::LazyInstance<std::multiset<int> >::Leaky
g_explicitly_allowed_ports = LAZY_INSTANCE_INITIALIZER;
size_t GetCountOfExplicitlyAllowedPorts() {
return g_explicitly_allowed_ports.Get().size();
}
std::string GetSpecificHeader(const std::string& headers,
const std::string& name) {
// We want to grab the Value from the "Key: Value" pairs in the headers,
// which should look like this (no leading spaces, \n-separated) (we format
// them this way in url_request_inet.cc):
// HTTP/1.1 200 OK\n
// ETag: "6d0b8-947-24f35ec0"\n
// Content-Length: 2375\n
// Content-Type: text/html; charset=UTF-8\n
// Last-Modified: Sun, 03 Sep 2006 04:34:43 GMT\n
if (headers.empty())
return std::string();
std::string match('\n' + name + ':');
std::string::const_iterator begin =
std::search(headers.begin(), headers.end(), match.begin(), match.end(),
base::CaseInsensitiveCompareASCII<char>());
if (begin == headers.end())
return std::string();
begin += match.length();
std::string ret;
base::TrimWhitespace(std::string(begin,
std::find(begin, headers.end(), '\n')),
base::TRIM_ALL, &ret);
return ret;
}
std::string CanonicalizeHost(const std::string& host,
url::CanonHostInfo* host_info) {
// Try to canonicalize the host.
const url::Component raw_host_component(0, static_cast<int>(host.length()));
std::string canon_host;
url::StdStringCanonOutput canon_host_output(&canon_host);
url::CanonicalizeHostVerbose(host.c_str(), raw_host_component,
&canon_host_output, host_info);
if (host_info->out_host.is_nonempty() &&
host_info->family != url::CanonHostInfo::BROKEN) {
// Success! Assert that there's no extra garbage.
canon_host_output.Complete();
DCHECK_EQ(host_info->out_host.len, static_cast<int>(canon_host.length()));
} else {
// Empty host, or canonicalization failed. We'll return empty.
canon_host.clear();
}
return canon_host;
}
std::string GetDirectoryListingHeader(const base::string16& title) {
static const base::StringPiece header(
NetModule::GetResource(IDR_DIR_HEADER_HTML));
// This can be null in unit tests.
DLOG_IF(WARNING, header.empty()) <<
"Missing resource: directory listing header";
std::string result;
if (!header.empty())
result.assign(header.data(), header.size());
result.append("<script>start(");
base::EscapeJSONString(title, true, &result);
result.append(");</script>\n");
return result;
}
inline bool IsHostCharAlphanumeric(char c) {
// We can just check lowercase because uppercase characters have already been
// normalized.
return ((c >= 'a') && (c <= 'z')) || ((c >= '0') && (c <= '9'));
}
bool IsCanonicalizedHostCompliant(const std::string& host,
const std::string& desired_tld) {
if (host.empty())
return false;
bool in_component = false;
bool most_recent_component_started_alphanumeric = false;
bool last_char_was_underscore = false;
for (std::string::const_iterator i(host.begin()); i != host.end(); ++i) {
const char c = *i;
if (!in_component) {
most_recent_component_started_alphanumeric = IsHostCharAlphanumeric(c);
if (!most_recent_component_started_alphanumeric && (c != '-'))
return false;
in_component = true;
} else {
if (c == '.') {
if (last_char_was_underscore)
return false;
in_component = false;
} else if (IsHostCharAlphanumeric(c) || (c == '-')) {
last_char_was_underscore = false;
} else if (c == '_') {
last_char_was_underscore = true;
} else {
return false;
}
}
}
return most_recent_component_started_alphanumeric ||
(!desired_tld.empty() && IsHostCharAlphanumeric(desired_tld[0]));
}
base::string16 StripWWW(const base::string16& text) {
const base::string16 www(base::ASCIIToUTF16("www."));
return StartsWith(text, www, true) ? text.substr(www.length()) : text;
}
base::string16 StripWWWFromHost(const GURL& url) {
DCHECK(url.is_valid());
return StripWWW(base::ASCIIToUTF16(url.host()));
}
bool IsPortAllowedByDefault(int port) {
int array_size = arraysize(kRestrictedPorts);
for (int i = 0; i < array_size; i++) {
if (kRestrictedPorts[i] == port) {
return false;
}
}
return true;
}
bool IsPortAllowedByFtp(int port) {
int array_size = arraysize(kAllowedFtpPorts);
for (int i = 0; i < array_size; i++) {
if (kAllowedFtpPorts[i] == port) {
return true;
}
}
// Port not explicitly allowed by FTP, so return the default restrictions.
return IsPortAllowedByDefault(port);
}
bool IsPortAllowedByOverride(int port) {
if (g_explicitly_allowed_ports.Get().empty())
return false;
return g_explicitly_allowed_ports.Get().count(port) > 0;
}
int SetNonBlocking(int fd) {
#if defined(OS_WIN)
unsigned long no_block = 1;
return ioctlsocket(fd, FIONBIO, &no_block);
#elif defined(OS_POSIX)
int flags = fcntl(fd, F_GETFL, 0);
if (-1 == flags)
return flags;
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
#endif
}
bool ParseHostAndPort(std::string::const_iterator host_and_port_begin,
std::string::const_iterator host_and_port_end,
std::string* host,
int* port) {
if (host_and_port_begin >= host_and_port_end)
return false;
// When using url, we use char*.
const char* auth_begin = &(*host_and_port_begin);
int auth_len = host_and_port_end - host_and_port_begin;
url::Component auth_component(0, auth_len);
url::Component username_component;
url::Component password_component;
url::Component hostname_component;
url::Component port_component;
url::ParseAuthority(auth_begin, auth_component, &username_component,
&password_component, &hostname_component, &port_component);
// There shouldn't be a username/password.
if (username_component.is_valid() || password_component.is_valid())
return false;
if (!hostname_component.is_nonempty())
return false; // Failed parsing.
int parsed_port_number = -1;
if (port_component.is_nonempty()) {
parsed_port_number = url::ParsePort(auth_begin, port_component);
// If parsing failed, port_number will be either PORT_INVALID or
// PORT_UNSPECIFIED, both of which are negative.
if (parsed_port_number < 0)
return false; // Failed parsing the port number.
}
if (port_component.len == 0)
return false; // Reject inputs like "foo:"
unsigned char tmp_ipv6_addr[16];
// If the hostname starts with a bracket, it is either an IPv6 literal or
// invalid. If it is an IPv6 literal then strip the brackets.
if (hostname_component.len > 0 &&
auth_begin[hostname_component.begin] == '[') {
if (auth_begin[hostname_component.end() - 1] == ']' &&
url::IPv6AddressToNumber(
auth_begin, hostname_component, tmp_ipv6_addr)) {
// Strip the brackets.
hostname_component.begin++;
hostname_component.len -= 2;
} else {
return false;
}
}
// Pass results back to caller.
host->assign(auth_begin + hostname_component.begin, hostname_component.len);
*port = parsed_port_number;
return true; // Success.
}
bool ParseHostAndPort(const std::string& host_and_port,
std::string* host,
int* port) {
return ParseHostAndPort(
host_and_port.begin(), host_and_port.end(), host, port);
}
std::string GetHostAndPort(const GURL& url) {
// For IPv6 literals, GURL::host() already includes the brackets so it is
// safe to just append a colon.
return base::StringPrintf("%s:%d", url.host().c_str(),
url.EffectiveIntPort());
}
std::string GetHostAndOptionalPort(const GURL& url) {
// For IPv6 literals, GURL::host() already includes the brackets
// so it is safe to just append a colon.
if (url.has_port())
return base::StringPrintf("%s:%s", url.host().c_str(), url.port().c_str());
return url.host();
}
bool IsHostnameNonUnique(const std::string& hostname) {
// CanonicalizeHost requires surrounding brackets to parse an IPv6 address.
const std::string host_or_ip = hostname.find(':') != std::string::npos ?
"[" + hostname + "]" : hostname;
url::CanonHostInfo host_info;
std::string canonical_name = CanonicalizeHost(host_or_ip, &host_info);
// If canonicalization fails, then the input is truly malformed. However,
// to avoid mis-reporting bad inputs as "non-unique", treat them as unique.
if (canonical_name.empty())
return false;
// If |hostname| is an IP address, check to see if it's in an IANA-reserved
// range.
if (host_info.IsIPAddress()) {
IPAddressNumber host_addr;
if (!ParseIPLiteralToNumber(hostname.substr(host_info.out_host.begin,
host_info.out_host.len),
&host_addr)) {
return false;
}
switch (host_info.family) {
case url::CanonHostInfo::IPV4:
case url::CanonHostInfo::IPV6:
return IsIPAddressReserved(host_addr);
case url::CanonHostInfo::NEUTRAL:
case url::CanonHostInfo::BROKEN:
return false;
}
}
// Check for a registry controlled portion of |hostname|, ignoring private
// registries, as they already chain to ICANN-administered registries,
// and explicitly ignoring unknown registries.
//
// Note: This means that as new gTLDs are introduced on the Internet, they
// will be treated as non-unique until the registry controlled domain list
// is updated. However, because gTLDs are expected to provide significant
// advance notice to deprecate older versions of this code, this an
// acceptable tradeoff.
return 0 == registry_controlled_domains::GetRegistryLength(
canonical_name,
registry_controlled_domains::EXCLUDE_UNKNOWN_REGISTRIES,
registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
}
// Don't compare IPv4 and IPv6 addresses (they have different range
// reservations). Keep separate reservation arrays for each IP type, and
// consolidate adjacent reserved ranges within a reservation array when
// possible.
// Sources for info:
// www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml
// www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml
// They're formatted here with the prefix as the last element. For example:
// 10.0.0.0/8 becomes 10,0,0,0,8 and fec0::/10 becomes 0xfe,0xc0,0,0,0...,10.
bool IsIPAddressReserved(const IPAddressNumber& host_addr) {
static const unsigned char kReservedIPv4[][5] = {
{ 0,0,0,0,8 }, { 10,0,0,0,8 }, { 100,64,0,0,10 }, { 127,0,0,0,8 },
{ 169,254,0,0,16 }, { 172,16,0,0,12 }, { 192,0,2,0,24 },
{ 192,88,99,0,24 }, { 192,168,0,0,16 }, { 198,18,0,0,15 },
{ 198,51,100,0,24 }, { 203,0,113,0,24 }, { 224,0,0,0,3 }
};
static const unsigned char kReservedIPv6[][17] = {
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8 },
{ 0x40,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2 },
{ 0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2 },
{ 0xc0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3 },
{ 0xe0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4 },
{ 0xf0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5 },
{ 0xf8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6 },
{ 0xfc,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7 },
{ 0xfe,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9 },
{ 0xfe,0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10 },
{ 0xfe,0xc0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10 },
};
size_t array_size = 0;
const unsigned char* array = NULL;
switch (host_addr.size()) {
case kIPv4AddressSize:
array_size = arraysize(kReservedIPv4);
array = kReservedIPv4[0];
break;
case kIPv6AddressSize:
array_size = arraysize(kReservedIPv6);
array = kReservedIPv6[0];
break;
}
if (!array)
return false;
size_t width = host_addr.size() + 1;
for (size_t i = 0; i < array_size; ++i, array += width) {
if (IPNumberPrefixCheck(host_addr, array, array[width-1]))
return true;
}
return false;
}
SockaddrStorage::SockaddrStorage(const SockaddrStorage& other)
: addr_len(other.addr_len),
addr(reinterpret_cast<struct sockaddr*>(&addr_storage)) {
memcpy(addr, other.addr, addr_len);
}
void SockaddrStorage::operator=(const SockaddrStorage& other) {
addr_len = other.addr_len;
// addr is already set to &this->addr_storage by default ctor.
memcpy(addr, other.addr, addr_len);
}
// Extracts the address and port portions of a sockaddr.
bool GetIPAddressFromSockAddr(const struct sockaddr* sock_addr,
socklen_t sock_addr_len,
const uint8** address,
size_t* address_len,
uint16* port) {
if (sock_addr->sa_family == AF_INET) {
if (sock_addr_len < static_cast<socklen_t>(sizeof(struct sockaddr_in)))
return false;
const struct sockaddr_in* addr =
reinterpret_cast<const struct sockaddr_in*>(sock_addr);
*address = reinterpret_cast<const uint8*>(&addr->sin_addr);
*address_len = kIPv4AddressSize;
if (port)
*port = base::NetToHost16(addr->sin_port);
return true;
}
if (sock_addr->sa_family == AF_INET6) {
if (sock_addr_len < static_cast<socklen_t>(sizeof(struct sockaddr_in6)))
return false;
const struct sockaddr_in6* addr =
reinterpret_cast<const struct sockaddr_in6*>(sock_addr);
*address = reinterpret_cast<const uint8*>(&addr->sin6_addr);
*address_len = kIPv6AddressSize;
if (port)
*port = base::NetToHost16(addr->sin6_port);
return true;
}
#if defined(OS_WIN)
if (sock_addr->sa_family == AF_BTH) {
if (sock_addr_len < static_cast<socklen_t>(sizeof(SOCKADDR_BTH)))
return false;
const SOCKADDR_BTH* addr =
reinterpret_cast<const SOCKADDR_BTH*>(sock_addr);
*address = reinterpret_cast<const uint8*>(&addr->btAddr);
*address_len = kBluetoothAddressSize;
if (port)
*port = addr->port;
return true;
}
#endif
return false; // Unrecognized |sa_family|.
}
std::string IPAddressToString(const uint8* address,
size_t address_len) {
std::string str;
url::StdStringCanonOutput output(&str);
if (address_len == kIPv4AddressSize) {
url::AppendIPv4Address(address, &output);
} else if (address_len == kIPv6AddressSize) {
url::AppendIPv6Address(address, &output);
} else {
CHECK(false) << "Invalid IP address with length: " << address_len;
}
output.Complete();
return str;
}
std::string IPAddressToStringWithPort(const uint8* address,
size_t address_len,
uint16 port) {
std::string address_str = IPAddressToString(address, address_len);
if (address_len == kIPv6AddressSize) {
// Need to bracket IPv6 addresses since they contain colons.
return base::StringPrintf("[%s]:%d", address_str.c_str(), port);
}
return base::StringPrintf("%s:%d", address_str.c_str(), port);
}
std::string NetAddressToString(const struct sockaddr* sa,
socklen_t sock_addr_len) {
const uint8* address;
size_t address_len;
if (!GetIPAddressFromSockAddr(sa, sock_addr_len, &address,
&address_len, NULL)) {
NOTREACHED();
return std::string();
}
return IPAddressToString(address, address_len);
}
std::string NetAddressToStringWithPort(const struct sockaddr* sa,
socklen_t sock_addr_len) {
const uint8* address;
size_t address_len;
uint16 port;
if (!GetIPAddressFromSockAddr(sa, sock_addr_len, &address,
&address_len, &port)) {
NOTREACHED();
return std::string();
}
return IPAddressToStringWithPort(address, address_len, port);
}
std::string IPAddressToString(const IPAddressNumber& addr) {
return IPAddressToString(&addr.front(), addr.size());
}
std::string IPAddressToStringWithPort(const IPAddressNumber& addr,
uint16 port) {
return IPAddressToStringWithPort(&addr.front(), addr.size(), port);
}
std::string IPAddressToPackedString(const IPAddressNumber& addr) {
return std::string(reinterpret_cast<const char *>(&addr.front()),
addr.size());
}
std::string GetHostName() {
#if defined(OS_NACL)
NOTIMPLEMENTED();
return std::string();
#else // defined(OS_NACL)
#if defined(OS_WIN)
EnsureWinsockInit();
#endif
// Host names are limited to 255 bytes.
char buffer[256];
int result = gethostname(buffer, sizeof(buffer));
if (result != 0) {
DVLOG(1) << "gethostname() failed with " << result;
buffer[0] = '\0';
}
return std::string(buffer);
#endif // !defined(OS_NACL)
}
void GetIdentityFromURL(const GURL& url,
base::string16* username,
base::string16* password) {
UnescapeRule::Type flags =
UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS;
*username = UnescapeAndDecodeUTF8URLComponent(url.username(), flags);
*password = UnescapeAndDecodeUTF8URLComponent(url.password(), flags);
}
std::string GetHostOrSpecFromURL(const GURL& url) {
return url.has_host() ? TrimEndingDot(url.host()) : url.spec();
}
bool CanStripTrailingSlash(const GURL& url) {
// Omit the path only for standard, non-file URLs with nothing but "/" after
// the hostname.
return url.IsStandard() && !url.SchemeIsFile() &&
!url.SchemeIsFileSystem() && !url.has_query() && !url.has_ref()
&& url.path() == "/";
}
GURL SimplifyUrlForRequest(const GURL& url) {
DCHECK(url.is_valid());
GURL::Replacements replacements;
replacements.ClearUsername();
replacements.ClearPassword();
replacements.ClearRef();
return url.ReplaceComponents(replacements);
}
// Specifies a comma separated list of port numbers that should be accepted
// despite bans. If the string is invalid no allowed ports are stored.
void SetExplicitlyAllowedPorts(const std::string& allowed_ports) {
if (allowed_ports.empty())
return;
std::multiset<int> ports;
size_t last = 0;
size_t size = allowed_ports.size();
// The comma delimiter.
const std::string::value_type kComma = ',';
// Overflow is still possible for evil user inputs.
for (size_t i = 0; i <= size; ++i) {
// The string should be composed of only digits and commas.
if (i != size && !IsAsciiDigit(allowed_ports[i]) &&
(allowed_ports[i] != kComma))
return;
if (i == size || allowed_ports[i] == kComma) {
if (i > last) {
int port;
base::StringToInt(base::StringPiece(allowed_ports.begin() + last,
allowed_ports.begin() + i),
&port);
ports.insert(port);
}
last = i + 1;
}
}
g_explicitly_allowed_ports.Get() = ports;
}
ScopedPortException::ScopedPortException(int port) : port_(port) {
g_explicitly_allowed_ports.Get().insert(port);
}
ScopedPortException::~ScopedPortException() {
std::multiset<int>::iterator it =
g_explicitly_allowed_ports.Get().find(port_);
if (it != g_explicitly_allowed_ports.Get().end())
g_explicitly_allowed_ports.Get().erase(it);
else
NOTREACHED();
}
bool HaveOnlyLoopbackAddresses() {
#if defined(OS_ANDROID)
return android::HaveOnlyLoopbackAddresses();
#elif defined(OS_NACL)
NOTIMPLEMENTED();
return false;
#elif defined(OS_POSIX)
struct ifaddrs* interface_addr = NULL;
int rv = getifaddrs(&interface_addr);
if (rv != 0) {
DVLOG(1) << "getifaddrs() failed with errno = " << errno;
return false;
}
bool result = true;
for (struct ifaddrs* interface = interface_addr;
interface != NULL;
interface = interface->ifa_next) {
if (!(IFF_UP & interface->ifa_flags))
continue;
if (IFF_LOOPBACK & interface->ifa_flags)
continue;
const struct sockaddr* addr = interface->ifa_addr;
if (!addr)
continue;
if (addr->sa_family == AF_INET6) {
// Safe cast since this is AF_INET6.
const struct sockaddr_in6* addr_in6 =
reinterpret_cast<const struct sockaddr_in6*>(addr);
const struct in6_addr* sin6_addr = &addr_in6->sin6_addr;
if (IN6_IS_ADDR_LOOPBACK(sin6_addr) || IN6_IS_ADDR_LINKLOCAL(sin6_addr))
continue;
}
if (addr->sa_family != AF_INET6 && addr->sa_family != AF_INET)
continue;
result = false;
break;
}
freeifaddrs(interface_addr);
return result;
#elif defined(OS_WIN)
// TODO(wtc): implement with the GetAdaptersAddresses function.
NOTIMPLEMENTED();
return false;
#else
NOTIMPLEMENTED();
return false;
#endif // defined(various platforms)
}
AddressFamily GetAddressFamily(const IPAddressNumber& address) {
switch (address.size()) {
case kIPv4AddressSize:
return ADDRESS_FAMILY_IPV4;
case kIPv6AddressSize:
return ADDRESS_FAMILY_IPV6;
default:
return ADDRESS_FAMILY_UNSPECIFIED;
}
}
int ConvertAddressFamily(AddressFamily address_family) {
switch (address_family) {
case ADDRESS_FAMILY_UNSPECIFIED:
return AF_UNSPEC;
case ADDRESS_FAMILY_IPV4:
return AF_INET;
case ADDRESS_FAMILY_IPV6:
return AF_INET6;
}
NOTREACHED();
return AF_UNSPEC;
}
bool ParseURLHostnameToNumber(const std::string& hostname,
IPAddressNumber* ip_number) {
// |hostname| is an already canoncalized hostname, conforming to RFC 3986.
// For an IP address, this is defined in Section 3.2.2 of RFC 3986, with
// the canonical form for IPv6 addresses defined in Section 4 of RFC 5952.
url::Component host_comp(0, hostname.size());
// If it has a bracket, try parsing it as an IPv6 address.
if (hostname[0] == '[') {
ip_number->resize(16); // 128 bits.
return url::IPv6AddressToNumber(
hostname.data(), host_comp, &(*ip_number)[0]);
}
// Otherwise, try IPv4.
ip_number->resize(4); // 32 bits.
int num_components;
url::CanonHostInfo::Family family = url::IPv4AddressToNumber(
hostname.data(), host_comp, &(*ip_number)[0], &num_components);
return family == url::CanonHostInfo::IPV4;
}
bool ParseIPLiteralToNumber(const std::string& ip_literal,
IPAddressNumber* ip_number) {
// |ip_literal| could be either a IPv4 or an IPv6 literal. If it contains
// a colon however, it must be an IPv6 address.
if (ip_literal.find(':') != std::string::npos) {
// GURL expects IPv6 hostnames to be surrounded with brackets.
std::string host_brackets = "[" + ip_literal + "]";
url::Component host_comp(0, host_brackets.size());
// Try parsing the hostname as an IPv6 literal.
ip_number->resize(16); // 128 bits.
return url::IPv6AddressToNumber(host_brackets.data(), host_comp,
&(*ip_number)[0]);
}
// Otherwise the string is an IPv4 address.
ip_number->resize(4); // 32 bits.
url::Component host_comp(0, ip_literal.size());
int num_components;
url::CanonHostInfo::Family family = url::IPv4AddressToNumber(
ip_literal.data(), host_comp, &(*ip_number)[0], &num_components);
return family == url::CanonHostInfo::IPV4;
}
namespace {
const unsigned char kIPv4MappedPrefix[] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF };
}
IPAddressNumber ConvertIPv4NumberToIPv6Number(
const IPAddressNumber& ipv4_number) {
DCHECK(ipv4_number.size() == 4);
// IPv4-mapped addresses are formed by:
// <80 bits of zeros> + <16 bits of ones> + <32-bit IPv4 address>.
IPAddressNumber ipv6_number;
ipv6_number.reserve(16);
ipv6_number.insert(ipv6_number.end(),
kIPv4MappedPrefix,
kIPv4MappedPrefix + arraysize(kIPv4MappedPrefix));
ipv6_number.insert(ipv6_number.end(), ipv4_number.begin(), ipv4_number.end());
return ipv6_number;
}
bool IsIPv4Mapped(const IPAddressNumber& address) {
if (address.size() != kIPv6AddressSize)
return false;
return std::equal(address.begin(),
address.begin() + arraysize(kIPv4MappedPrefix),
kIPv4MappedPrefix);
}
IPAddressNumber ConvertIPv4MappedToIPv4(const IPAddressNumber& address) {
DCHECK(IsIPv4Mapped(address));
return IPAddressNumber(address.begin() + arraysize(kIPv4MappedPrefix),
address.end());
}
bool ParseCIDRBlock(const std::string& cidr_literal,
IPAddressNumber* ip_number,
size_t* prefix_length_in_bits) {
// We expect CIDR notation to match one of these two templates:
// <IPv4-literal> "/" <number of bits>
// <IPv6-literal> "/" <number of bits>
std::vector<std::string> parts;
base::SplitString(cidr_literal, '/', &parts);
if (parts.size() != 2)
return false;
// Parse the IP address.
if (!ParseIPLiteralToNumber(parts[0], ip_number))
return false;
// Parse the prefix length.
int number_of_bits = -1;
if (!base::StringToInt(parts[1], &number_of_bits))
return false;
// Make sure the prefix length is in a valid range.
if (number_of_bits < 0 ||
number_of_bits > static_cast<int>(ip_number->size() * 8))
return false;
*prefix_length_in_bits = static_cast<size_t>(number_of_bits);
return true;
}
bool IPNumberMatchesPrefix(const IPAddressNumber& ip_number,
const IPAddressNumber& ip_prefix,
size_t prefix_length_in_bits) {
// Both the input IP address and the prefix IP address should be
// either IPv4 or IPv6.
DCHECK(ip_number.size() == 4 || ip_number.size() == 16);
DCHECK(ip_prefix.size() == 4 || ip_prefix.size() == 16);
DCHECK_LE(prefix_length_in_bits, ip_prefix.size() * 8);
// In case we have an IPv6 / IPv4 mismatch, convert the IPv4 addresses to
// IPv6 addresses in order to do the comparison.
if (ip_number.size() != ip_prefix.size()) {
if (ip_number.size() == 4) {
return IPNumberMatchesPrefix(ConvertIPv4NumberToIPv6Number(ip_number),
ip_prefix, prefix_length_in_bits);
}
return IPNumberMatchesPrefix(ip_number,
ConvertIPv4NumberToIPv6Number(ip_prefix),
96 + prefix_length_in_bits);
}
return IPNumberPrefixCheck(ip_number, &ip_prefix[0], prefix_length_in_bits);
}
const uint16* GetPortFieldFromSockaddr(const struct sockaddr* address,
socklen_t address_len) {
if (address->sa_family == AF_INET) {
DCHECK_LE(sizeof(sockaddr_in), static_cast<size_t>(address_len));
const struct sockaddr_in* sockaddr =
reinterpret_cast<const struct sockaddr_in*>(address);
return &sockaddr->sin_port;
} else if (address->sa_family == AF_INET6) {
DCHECK_LE(sizeof(sockaddr_in6), static_cast<size_t>(address_len));
const struct sockaddr_in6* sockaddr =
reinterpret_cast<const struct sockaddr_in6*>(address);
return &sockaddr->sin6_port;
} else {
NOTREACHED();
return NULL;
}
}
int GetPortFromSockaddr(const struct sockaddr* address, socklen_t address_len) {
const uint16* port_field = GetPortFieldFromSockaddr(address, address_len);
if (!port_field)
return -1;
return base::NetToHost16(*port_field);
}
bool IsLocalhost(const std::string& host) {
if (host == "localhost" ||
host == "localhost.localdomain" ||
host == "localhost6" ||
host == "localhost6.localdomain6")
return true;
IPAddressNumber ip_number;
if (ParseIPLiteralToNumber(host, &ip_number)) {
size_t size = ip_number.size();
switch (size) {
case kIPv4AddressSize: {
IPAddressNumber localhost_prefix;
localhost_prefix.push_back(127);
for (int i = 0; i < 3; ++i) {
localhost_prefix.push_back(0);
}
return IPNumberMatchesPrefix(ip_number, localhost_prefix, 8);
}
case kIPv6AddressSize: {
struct in6_addr sin6_addr;
memcpy(&sin6_addr, &ip_number[0], kIPv6AddressSize);
return !!IN6_IS_ADDR_LOOPBACK(&sin6_addr);
}
default:
NOTREACHED();
}
}
return false;
}
NetworkInterface::NetworkInterface()
: type(NetworkChangeNotifier::CONNECTION_UNKNOWN),
network_prefix(0) {
}
NetworkInterface::NetworkInterface(const std::string& name,
const std::string& friendly_name,
uint32 interface_index,
NetworkChangeNotifier::ConnectionType type,
const IPAddressNumber& address,
uint32 network_prefix,
int ip_address_attributes)
: name(name),
friendly_name(friendly_name),
interface_index(interface_index),
type(type),
address(address),
network_prefix(network_prefix),
ip_address_attributes(ip_address_attributes) {
}
NetworkInterface::~NetworkInterface() {
}
unsigned CommonPrefixLength(const IPAddressNumber& a1,
const IPAddressNumber& a2) {
DCHECK_EQ(a1.size(), a2.size());
for (size_t i = 0; i < a1.size(); ++i) {
unsigned diff = a1[i] ^ a2[i];
if (!diff)
continue;
for (unsigned j = 0; j < CHAR_BIT; ++j) {
if (diff & (1 << (CHAR_BIT - 1)))
return i * CHAR_BIT + j;
diff <<= 1;
}
NOTREACHED();
}
return a1.size() * CHAR_BIT;
}
unsigned MaskPrefixLength(const IPAddressNumber& mask) {
IPAddressNumber all_ones(mask.size(), 0xFF);
return CommonPrefixLength(mask, all_ones);
}
ScopedWifiOptions::~ScopedWifiOptions() {
}
} // namespace net