1 /*
2 * libjingle
3 * Copyright 2004--2005, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #ifdef POSIX
29 #include <sys/types.h>
30 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <netinet/ip.h>
33 #include <arpa/inet.h>
34 #include <netdb.h>
35 #include <unistd.h>
36 #endif
37
38 #include <sstream>
39
40 #include "talk/base/byteorder.h"
41 #include "talk/base/common.h"
42 #include "talk/base/logging.h"
43 #include "talk/base/nethelpers.h"
44 #include "talk/base/socketaddress.h"
45
46 #ifdef WIN32
47 // Win32 doesn't provide inet_aton, so we add our own version here.
48 // Since inet_addr returns 0xFFFFFFFF on error, if we get this value
49 // we need to test the input to see if the address really was 255.255.255.255.
50 // This is slightly fragile, but better than doing nothing.
inet_aton(const char * cp,struct in_addr * inp)51 int inet_aton(const char* cp, struct in_addr* inp) {
52 inp->s_addr = inet_addr(cp);
53 return (inp->s_addr == INADDR_NONE &&
54 strcmp(cp, "255.255.255.255") != 0) ? 0 : 1;
55 }
56 #endif // WIN32
57
58 namespace talk_base {
59
SocketAddress()60 SocketAddress::SocketAddress() {
61 Clear();
62 }
63
SocketAddress(const std::string & hostname,int port)64 SocketAddress::SocketAddress(const std::string& hostname, int port) {
65 SetIP(hostname);
66 SetPort(port);
67 }
68
SocketAddress(uint32 ip,int port)69 SocketAddress::SocketAddress(uint32 ip, int port) {
70 SetIP(ip);
71 SetPort(port);
72 }
73
SocketAddress(const SocketAddress & addr)74 SocketAddress::SocketAddress(const SocketAddress& addr) {
75 this->operator=(addr);
76 }
77
Clear()78 void SocketAddress::Clear() {
79 hostname_.clear();
80 ip_ = 0;
81 port_ = 0;
82 }
83
IsNil() const84 bool SocketAddress::IsNil() const {
85 return hostname_.empty() && (0 == ip_) && (0 == port_);
86 }
87
IsComplete() const88 bool SocketAddress::IsComplete() const {
89 return (0 != ip_) && (0 != port_);
90 }
91
operator =(const SocketAddress & addr)92 SocketAddress& SocketAddress::operator=(const SocketAddress& addr) {
93 hostname_ = addr.hostname_;
94 ip_ = addr.ip_;
95 port_ = addr.port_;
96 return *this;
97 }
98
SetIP(uint32 ip)99 void SocketAddress::SetIP(uint32 ip) {
100 hostname_.clear();
101 ip_ = ip;
102 }
103
SetIP(const std::string & hostname)104 void SocketAddress::SetIP(const std::string& hostname) {
105 hostname_ = hostname;
106 ip_ = StringToIP(hostname);
107 }
108
SetResolvedIP(uint32 ip)109 void SocketAddress::SetResolvedIP(uint32 ip) {
110 ip_ = ip;
111 }
112
SetPort(int port)113 void SocketAddress::SetPort(int port) {
114 ASSERT((0 <= port) && (port < 65536));
115 port_ = port;
116 }
117
ip() const118 uint32 SocketAddress::ip() const {
119 return ip_;
120 }
121
port() const122 uint16 SocketAddress::port() const {
123 return port_;
124 }
125
IPAsString() const126 std::string SocketAddress::IPAsString() const {
127 if (!hostname_.empty())
128 return hostname_;
129 return IPToString(ip_);
130 }
131
PortAsString() const132 std::string SocketAddress::PortAsString() const {
133 std::ostringstream ost;
134 ost << port_;
135 return ost.str();
136 }
137
ToString() const138 std::string SocketAddress::ToString() const {
139 std::ostringstream ost;
140 ost << IPAsString();
141 ost << ":";
142 ost << port();
143 return ost.str();
144 }
145
FromString(const std::string & str)146 bool SocketAddress::FromString(const std::string& str) {
147 std::string::size_type pos = str.find(':');
148 if (std::string::npos == pos)
149 return false;
150 SetPort(strtoul(str.substr(pos + 1).c_str(), NULL, 10));
151 SetIP(str.substr(0, pos));
152 return true;
153 }
154
operator <<(std::ostream & os,const SocketAddress & addr)155 std::ostream& operator<<(std::ostream& os, const SocketAddress& addr) {
156 os << addr.IPAsString() << ":" << addr.port();
157 return os;
158 }
159
IsAnyIP() const160 bool SocketAddress::IsAnyIP() const {
161 return (ip_ == 0);
162 }
163
IsLoopbackIP() const164 bool SocketAddress::IsLoopbackIP() const {
165 if (0 == ip_) {
166 return (0 == stricmp(hostname_.c_str(), "localhost"));
167 } else {
168 return ((ip_ >> 24) == 127);
169 }
170 }
171
IsLocalIP() const172 bool SocketAddress::IsLocalIP() const {
173 if (IsLoopbackIP())
174 return true;
175
176 std::vector<uint32> ips;
177 if (0 == ip_) {
178 if (!hostname_.empty()
179 && (0 == stricmp(hostname_.c_str(), GetHostname().c_str()))) {
180 return true;
181 }
182 } else if (GetLocalIPs(ips)) {
183 for (size_t i = 0; i < ips.size(); ++i) {
184 if (ips[i] == ip_) {
185 return true;
186 }
187 }
188 }
189 return false;
190 }
191
IsPrivateIP() const192 bool SocketAddress::IsPrivateIP() const {
193 return ((ip_ >> 24) == 127) ||
194 ((ip_ >> 24) == 10) ||
195 ((ip_ >> 20) == ((172 << 4) | 1)) ||
196 ((ip_ >> 16) == ((192 << 8) | 168)) ||
197 ((ip_ >> 16) == ((169 << 8) | 254));
198 }
199
IsUnresolvedIP() const200 bool SocketAddress::IsUnresolvedIP() const {
201 return IsAny() && !hostname_.empty();
202 }
203
ResolveIP(bool force,int * error)204 bool SocketAddress::ResolveIP(bool force, int* error) {
205 if (hostname_.empty()) {
206 // nothing to resolve
207 } else if (!force && !IsAny()) {
208 // already resolved
209 } else {
210 LOG_F(LS_VERBOSE) << "(" << hostname_ << ")";
211 int errcode = 0;
212 if (hostent* pHost = SafeGetHostByName(hostname_.c_str(), &errcode)) {
213 ip_ = NetworkToHost32(*reinterpret_cast<uint32*>(pHost->h_addr_list[0]));
214 LOG_F(LS_VERBOSE) << "(" << hostname_ << ") resolved to: "
215 << IPToString(ip_);
216 FreeHostEnt(pHost);
217 } else {
218 LOG_F(LS_ERROR) << "(" << hostname_ << ") err: " << errcode;
219 }
220 if (error) {
221 *error = errcode;
222 }
223 }
224 return (ip_ != 0);
225 }
226
operator ==(const SocketAddress & addr) const227 bool SocketAddress::operator==(const SocketAddress& addr) const {
228 return EqualIPs(addr) && EqualPorts(addr);
229 }
230
operator <(const SocketAddress & addr) const231 bool SocketAddress::operator<(const SocketAddress& addr) const {
232 if (ip_ < addr.ip_)
233 return true;
234 else if (addr.ip_ < ip_)
235 return false;
236
237 // We only check hostnames if both IPs are zero. This matches EqualIPs()
238 if (addr.ip_ == 0) {
239 if (hostname_ < addr.hostname_)
240 return true;
241 else if (addr.hostname_ < hostname_)
242 return false;
243 }
244
245 return port_ < addr.port_;
246 }
247
EqualIPs(const SocketAddress & addr) const248 bool SocketAddress::EqualIPs(const SocketAddress& addr) const {
249 return (ip_ == addr.ip_) && ((ip_ != 0) || (hostname_ == addr.hostname_));
250 }
251
EqualPorts(const SocketAddress & addr) const252 bool SocketAddress::EqualPorts(const SocketAddress& addr) const {
253 return (port_ == addr.port_);
254 }
255
Hash() const256 size_t SocketAddress::Hash() const {
257 size_t h = 0;
258 h ^= ip_;
259 h ^= port_ | (port_ << 16);
260 return h;
261 }
262
Size_() const263 size_t SocketAddress::Size_() const {
264 return sizeof(ip_) + sizeof(port_) + 2;
265 }
266
Write_(char * buf,int len) const267 bool SocketAddress::Write_(char* buf, int len) const {
268 if (len < static_cast<int>(Size_()))
269 return false;
270 buf[0] = 0;
271 buf[1] = AF_INET;
272 SetBE16(buf + 2, port_);
273 SetBE32(buf + 4, ip_);
274 return true;
275 }
276
Read_(const char * buf,int len)277 bool SocketAddress::Read_(const char* buf, int len) {
278 if (len < static_cast<int>(Size_()) || buf[1] != AF_INET)
279 return false;
280 port_ = GetBE16(buf + 2);
281 ip_ = GetBE32(buf + 4);
282 return true;
283 }
284
ToSockAddr(sockaddr_in * saddr) const285 void SocketAddress::ToSockAddr(sockaddr_in* saddr) const {
286 memset(saddr, 0, sizeof(*saddr));
287 saddr->sin_family = AF_INET;
288 saddr->sin_port = HostToNetwork16(port_);
289 if (0 == ip_) {
290 saddr->sin_addr.s_addr = INADDR_ANY;
291 } else {
292 saddr->sin_addr.s_addr = HostToNetwork32(ip_);
293 }
294 }
295
FromSockAddr(const sockaddr_in & saddr)296 bool SocketAddress::FromSockAddr(const sockaddr_in& saddr) {
297 if (saddr.sin_family != AF_INET)
298 return false;
299 SetIP(NetworkToHost32(saddr.sin_addr.s_addr));
300 SetPort(NetworkToHost16(saddr.sin_port));
301 return true;
302 }
303
IPToString(uint32 ip)304 std::string SocketAddress::IPToString(uint32 ip) {
305 std::ostringstream ost;
306 ost << ((ip >> 24) & 0xff);
307 ost << '.';
308 ost << ((ip >> 16) & 0xff);
309 ost << '.';
310 ost << ((ip >> 8) & 0xff);
311 ost << '.';
312 ost << ((ip >> 0) & 0xff);
313 return ost.str();
314 }
315
StringToIP(const std::string & hostname,uint32 * ip)316 bool SocketAddress::StringToIP(const std::string& hostname, uint32* ip) {
317 in_addr addr;
318 if (inet_aton(hostname.c_str(), &addr) == 0)
319 return false;
320 *ip = NetworkToHost32(addr.s_addr);
321 return true;
322 }
323
StringToIP(const std::string & hostname)324 uint32 SocketAddress::StringToIP(const std::string& hostname) {
325 uint32 ip = 0;
326 StringToIP(hostname, &ip);
327 return ip;
328 }
329
GetHostname()330 std::string SocketAddress::GetHostname() {
331 char hostname[256];
332 if (gethostname(hostname, ARRAY_SIZE(hostname)) == 0)
333 return hostname;
334 return "";
335 }
336
GetLocalIPs(std::vector<uint32> & ips)337 bool SocketAddress::GetLocalIPs(std::vector<uint32>& ips) {
338 ips.clear();
339
340 const std::string hostname = GetHostname();
341 if (hostname.empty())
342 return false;
343
344 int errcode;
345 if (hostent* pHost = SafeGetHostByName(hostname.c_str(), &errcode)) {
346 for (size_t i = 0; pHost->h_addr_list[i]; ++i) {
347 uint32 ip =
348 NetworkToHost32(*reinterpret_cast<uint32 *>(pHost->h_addr_list[i]));
349 ips.push_back(ip);
350 }
351 FreeHostEnt(pHost);
352 return !ips.empty();
353 }
354 LOG(LS_ERROR) << "gethostbyname err: " << errcode;
355 return false;
356 }
357
358 } // namespace talk_base
359