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1 /*
2  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #if defined(WEBRTC_POSIX)
12 #include <sys/types.h>
13 #include <sys/socket.h>
14 #include <netinet/in.h>
15 #ifdef OPENBSD
16 #include <netinet/in_systm.h>
17 #endif
18 #ifndef __native_client__
19 #include <netinet/ip.h>
20 #endif
21 #include <arpa/inet.h>
22 #include <netdb.h>
23 #include <unistd.h>
24 #endif
25 
26 #include <stdio.h>
27 
28 #include "webrtc/base/ipaddress.h"
29 #include "webrtc/base/byteorder.h"
30 #include "webrtc/base/checks.h"
31 #include "webrtc/base/logging.h"
32 #include "webrtc/base/nethelpers.h"
33 #include "webrtc/base/stringutils.h"
34 #include "webrtc/base/win32.h"
35 
36 namespace rtc {
37 
38 // Prefixes used for categorizing IPv6 addresses.
39 static const in6_addr kV4MappedPrefix = {{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
40                                            0xFF, 0xFF, 0}}};
41 static const in6_addr k6To4Prefix = {{{0x20, 0x02, 0}}};
42 static const in6_addr kTeredoPrefix = {{{0x20, 0x01, 0x00, 0x00}}};
43 static const in6_addr kV4CompatibilityPrefix = {{{0}}};
44 static const in6_addr k6BonePrefix = {{{0x3f, 0xfe, 0}}};
45 
46 static bool IsPrivateV4(uint32_t ip);
47 static in_addr ExtractMappedAddress(const in6_addr& addr);
48 
v4AddressAsHostOrderInteger() const49 uint32_t IPAddress::v4AddressAsHostOrderInteger() const {
50   if (family_ == AF_INET) {
51     return NetworkToHost32(u_.ip4.s_addr);
52   } else {
53     return 0;
54   }
55 }
56 
IsNil() const57 bool IPAddress::IsNil() const {
58   return IPIsUnspec(*this);
59 }
60 
Size() const61 size_t IPAddress::Size() const {
62   switch (family_) {
63     case AF_INET:
64       return sizeof(in_addr);
65     case AF_INET6:
66       return sizeof(in6_addr);
67   }
68   return 0;
69 }
70 
71 
operator ==(const IPAddress & other) const72 bool IPAddress::operator==(const IPAddress &other) const {
73   if (family_ != other.family_) {
74     return false;
75   }
76   if (family_ == AF_INET) {
77     return memcmp(&u_.ip4, &other.u_.ip4, sizeof(u_.ip4)) == 0;
78   }
79   if (family_ == AF_INET6) {
80     return memcmp(&u_.ip6, &other.u_.ip6, sizeof(u_.ip6)) == 0;
81   }
82   return family_ == AF_UNSPEC;
83 }
84 
operator !=(const IPAddress & other) const85 bool IPAddress::operator!=(const IPAddress &other) const {
86   return !((*this) == other);
87 }
88 
operator >(const IPAddress & other) const89 bool IPAddress::operator >(const IPAddress &other) const {
90   return (*this) != other && !((*this) < other);
91 }
92 
operator <(const IPAddress & other) const93 bool IPAddress::operator <(const IPAddress &other) const {
94   // IPv4 is 'less than' IPv6
95   if (family_ != other.family_) {
96     if (family_ == AF_UNSPEC) {
97       return true;
98     }
99     if (family_ == AF_INET && other.family_ == AF_INET6) {
100       return true;
101     }
102     return false;
103   }
104   // Comparing addresses of the same family.
105   switch (family_) {
106     case AF_INET: {
107       return NetworkToHost32(u_.ip4.s_addr) <
108           NetworkToHost32(other.u_.ip4.s_addr);
109     }
110     case AF_INET6: {
111       return memcmp(&u_.ip6.s6_addr, &other.u_.ip6.s6_addr, 16) < 0;
112     }
113   }
114   // Catches AF_UNSPEC and invalid addresses.
115   return false;
116 }
117 
operator <<(std::ostream & os,const IPAddress & ip)118 std::ostream& operator<<(std::ostream& os, const IPAddress& ip) {
119   os << ip.ToString();
120   return os;
121 }
122 
ipv6_address() const123 in6_addr IPAddress::ipv6_address() const {
124   return u_.ip6;
125 }
126 
ipv4_address() const127 in_addr IPAddress::ipv4_address() const {
128   return u_.ip4;
129 }
130 
ToString() const131 std::string IPAddress::ToString() const {
132   if (family_ != AF_INET && family_ != AF_INET6) {
133     return std::string();
134   }
135   char buf[INET6_ADDRSTRLEN] = {0};
136   const void* src = &u_.ip4;
137   if (family_ == AF_INET6) {
138     src = &u_.ip6;
139   }
140   if (!rtc::inet_ntop(family_, src, buf, sizeof(buf))) {
141     return std::string();
142   }
143   return std::string(buf);
144 }
145 
ToSensitiveString() const146 std::string IPAddress::ToSensitiveString() const {
147 #if !defined(NDEBUG)
148   // Return non-stripped in debug.
149   return ToString();
150 #else
151   switch (family_) {
152     case AF_INET: {
153       std::string address = ToString();
154       size_t find_pos = address.rfind('.');
155       if (find_pos == std::string::npos)
156         return std::string();
157       address.resize(find_pos);
158       address += ".x";
159       return address;
160     }
161     case AF_INET6: {
162       std::string result;
163       result.resize(INET6_ADDRSTRLEN);
164       in6_addr addr = ipv6_address();
165       size_t len =
166           rtc::sprintfn(&(result[0]), result.size(), "%x:%x:%x:x:x:x:x:x",
167                         (addr.s6_addr[0] << 8) + addr.s6_addr[1],
168                         (addr.s6_addr[2] << 8) + addr.s6_addr[3],
169                         (addr.s6_addr[4] << 8) + addr.s6_addr[5]);
170       result.resize(len);
171       return result;
172     }
173   }
174   return std::string();
175 #endif
176 }
177 
Normalized() const178 IPAddress IPAddress::Normalized() const {
179   if (family_ != AF_INET6) {
180     return *this;
181   }
182   if (!IPIsV4Mapped(*this)) {
183     return *this;
184   }
185   in_addr addr = ExtractMappedAddress(u_.ip6);
186   return IPAddress(addr);
187 }
188 
AsIPv6Address() const189 IPAddress IPAddress::AsIPv6Address() const {
190   if (family_ != AF_INET) {
191     return *this;
192   }
193   in6_addr v6addr = kV4MappedPrefix;
194   ::memcpy(&v6addr.s6_addr[12], &u_.ip4.s_addr, sizeof(u_.ip4.s_addr));
195   return IPAddress(v6addr);
196 }
197 
operator ==(const InterfaceAddress & other) const198 bool InterfaceAddress::operator==(const InterfaceAddress &other) const {
199   return ipv6_flags_ == other.ipv6_flags() &&
200     static_cast<const IPAddress&>(*this) == other;
201 }
202 
operator !=(const InterfaceAddress & other) const203 bool InterfaceAddress::operator!=(const InterfaceAddress &other) const {
204   return !((*this) == other);
205 }
206 
operator =(const InterfaceAddress & other)207 const InterfaceAddress& InterfaceAddress::operator=(
208   const InterfaceAddress& other) {
209   ipv6_flags_ = other.ipv6_flags_;
210   static_cast<IPAddress&>(*this) = other;
211   return *this;
212 }
213 
operator <<(std::ostream & os,const InterfaceAddress & ip)214 std::ostream& operator<<(std::ostream& os, const InterfaceAddress& ip) {
215   os << static_cast<const IPAddress&>(ip);
216 
217   if (ip.family() == AF_INET6)
218     os << "|flags:0x" << std::hex << ip.ipv6_flags();
219 
220   return os;
221 }
222 
IsPrivateV4(uint32_t ip_in_host_order)223 bool IsPrivateV4(uint32_t ip_in_host_order) {
224   return ((ip_in_host_order >> 24) == 127) ||
225       ((ip_in_host_order >> 24) == 10) ||
226       ((ip_in_host_order >> 20) == ((172 << 4) | 1)) ||
227       ((ip_in_host_order >> 16) == ((192 << 8) | 168)) ||
228       ((ip_in_host_order >> 16) == ((169 << 8) | 254));
229 }
230 
ExtractMappedAddress(const in6_addr & in6)231 in_addr ExtractMappedAddress(const in6_addr& in6) {
232   in_addr ipv4;
233   ::memcpy(&ipv4.s_addr, &in6.s6_addr[12], sizeof(ipv4.s_addr));
234   return ipv4;
235 }
236 
IPFromAddrInfo(struct addrinfo * info,IPAddress * out)237 bool IPFromAddrInfo(struct addrinfo* info, IPAddress* out) {
238   if (!info || !info->ai_addr) {
239     return false;
240   }
241   if (info->ai_addr->sa_family == AF_INET) {
242     sockaddr_in* addr = reinterpret_cast<sockaddr_in*>(info->ai_addr);
243     *out = IPAddress(addr->sin_addr);
244     return true;
245   } else if (info->ai_addr->sa_family == AF_INET6) {
246     sockaddr_in6* addr = reinterpret_cast<sockaddr_in6*>(info->ai_addr);
247     *out = IPAddress(addr->sin6_addr);
248     return true;
249   }
250   return false;
251 }
252 
IPFromString(const std::string & str,IPAddress * out)253 bool IPFromString(const std::string& str, IPAddress* out) {
254   if (!out) {
255     return false;
256   }
257   in_addr addr;
258   if (rtc::inet_pton(AF_INET, str.c_str(), &addr) == 0) {
259     in6_addr addr6;
260     if (rtc::inet_pton(AF_INET6, str.c_str(), &addr6) == 0) {
261       *out = IPAddress();
262       return false;
263     }
264     *out = IPAddress(addr6);
265   } else {
266     *out = IPAddress(addr);
267   }
268   return true;
269 }
270 
IPFromString(const std::string & str,int flags,InterfaceAddress * out)271 bool IPFromString(const std::string& str, int flags,
272                   InterfaceAddress* out) {
273   IPAddress ip;
274   if (!IPFromString(str, &ip)) {
275     return false;
276   }
277 
278   *out = InterfaceAddress(ip, flags);
279   return true;
280 }
281 
IPIsAny(const IPAddress & ip)282 bool IPIsAny(const IPAddress& ip) {
283   switch (ip.family()) {
284     case AF_INET:
285       return ip == IPAddress(INADDR_ANY);
286     case AF_INET6:
287       return ip == IPAddress(in6addr_any) || ip == IPAddress(kV4MappedPrefix);
288     case AF_UNSPEC:
289       return false;
290   }
291   return false;
292 }
293 
IPIsLoopback(const IPAddress & ip)294 bool IPIsLoopback(const IPAddress& ip) {
295   switch (ip.family()) {
296     case AF_INET: {
297       return ip == IPAddress(INADDR_LOOPBACK);
298     }
299     case AF_INET6: {
300       return ip == IPAddress(in6addr_loopback);
301     }
302   }
303   return false;
304 }
305 
IPIsPrivate(const IPAddress & ip)306 bool IPIsPrivate(const IPAddress& ip) {
307   switch (ip.family()) {
308     case AF_INET: {
309       return IsPrivateV4(ip.v4AddressAsHostOrderInteger());
310     }
311     case AF_INET6: {
312       return IPIsLinkLocal(ip) || IPIsLoopback(ip);
313     }
314   }
315   return false;
316 }
317 
IPIsUnspec(const IPAddress & ip)318 bool IPIsUnspec(const IPAddress& ip) {
319   return ip.family() == AF_UNSPEC;
320 }
321 
HashIP(const IPAddress & ip)322 size_t HashIP(const IPAddress& ip) {
323   switch (ip.family()) {
324     case AF_INET: {
325       return ip.ipv4_address().s_addr;
326     }
327     case AF_INET6: {
328       in6_addr v6addr = ip.ipv6_address();
329       const uint32_t* v6_as_ints =
330           reinterpret_cast<const uint32_t*>(&v6addr.s6_addr);
331       return v6_as_ints[0] ^ v6_as_ints[1] ^ v6_as_ints[2] ^ v6_as_ints[3];
332     }
333   }
334   return 0;
335 }
336 
TruncateIP(const IPAddress & ip,int length)337 IPAddress TruncateIP(const IPAddress& ip, int length) {
338   if (length < 0) {
339     return IPAddress();
340   }
341   if (ip.family() == AF_INET) {
342     if (length > 31) {
343       return ip;
344     }
345     if (length == 0) {
346       return IPAddress(INADDR_ANY);
347     }
348     int mask = (0xFFFFFFFF << (32 - length));
349     uint32_t host_order_ip = NetworkToHost32(ip.ipv4_address().s_addr);
350     in_addr masked;
351     masked.s_addr = HostToNetwork32(host_order_ip & mask);
352     return IPAddress(masked);
353   } else if (ip.family() == AF_INET6) {
354     if (length > 127) {
355       return ip;
356     }
357     if (length == 0) {
358       return IPAddress(in6addr_any);
359     }
360     in6_addr v6addr = ip.ipv6_address();
361     int position = length / 32;
362     int inner_length = 32 - (length - (position * 32));
363     // Note: 64bit mask constant needed to allow possible 32-bit left shift.
364     uint32_t inner_mask = 0xFFFFFFFFLL << inner_length;
365     uint32_t* v6_as_ints = reinterpret_cast<uint32_t*>(&v6addr.s6_addr);
366     for (int i = 0; i < 4; ++i) {
367       if (i == position) {
368         uint32_t host_order_inner = NetworkToHost32(v6_as_ints[i]);
369         v6_as_ints[i] = HostToNetwork32(host_order_inner & inner_mask);
370       } else if (i > position) {
371         v6_as_ints[i] = 0;
372       }
373     }
374     return IPAddress(v6addr);
375   }
376   return IPAddress();
377 }
378 
CountIPMaskBits(IPAddress mask)379 int CountIPMaskBits(IPAddress mask) {
380   uint32_t word_to_count = 0;
381   int bits = 0;
382   switch (mask.family()) {
383     case AF_INET: {
384       word_to_count = NetworkToHost32(mask.ipv4_address().s_addr);
385       break;
386     }
387     case AF_INET6: {
388       in6_addr v6addr = mask.ipv6_address();
389       const uint32_t* v6_as_ints =
390           reinterpret_cast<const uint32_t*>(&v6addr.s6_addr);
391       int i = 0;
392       for (; i < 4; ++i) {
393         if (v6_as_ints[i] != 0xFFFFFFFF) {
394           break;
395         }
396       }
397       if (i < 4) {
398         word_to_count = NetworkToHost32(v6_as_ints[i]);
399       }
400       bits = (i * 32);
401       break;
402     }
403     default: {
404       return 0;
405     }
406   }
407   if (word_to_count == 0) {
408     return bits;
409   }
410 
411   // Public domain bit-twiddling hack from:
412   // http://graphics.stanford.edu/~seander/bithacks.html
413   // Counts the trailing 0s in the word.
414   unsigned int zeroes = 32;
415   word_to_count &= -static_cast<int32_t>(word_to_count);
416   if (word_to_count) zeroes--;
417   if (word_to_count & 0x0000FFFF) zeroes -= 16;
418   if (word_to_count & 0x00FF00FF) zeroes -= 8;
419   if (word_to_count & 0x0F0F0F0F) zeroes -= 4;
420   if (word_to_count & 0x33333333) zeroes -= 2;
421   if (word_to_count & 0x55555555) zeroes -= 1;
422 
423   return bits + (32 - zeroes);
424 }
425 
IPIsHelper(const IPAddress & ip,const in6_addr & tomatch,int length)426 bool IPIsHelper(const IPAddress& ip, const in6_addr& tomatch, int length) {
427   // Helper method for checking IP prefix matches (but only on whole byte
428   // lengths). Length is in bits.
429   in6_addr addr = ip.ipv6_address();
430   return ::memcmp(&addr, &tomatch, (length >> 3)) == 0;
431 }
432 
IPIs6Bone(const IPAddress & ip)433 bool IPIs6Bone(const IPAddress& ip) {
434   return IPIsHelper(ip, k6BonePrefix, 16);
435 }
436 
IPIs6To4(const IPAddress & ip)437 bool IPIs6To4(const IPAddress& ip) {
438   return IPIsHelper(ip, k6To4Prefix, 16);
439 }
440 
IPIsLinkLocal(const IPAddress & ip)441 bool IPIsLinkLocal(const IPAddress& ip) {
442   // Can't use the helper because the prefix is 10 bits.
443   in6_addr addr = ip.ipv6_address();
444   return addr.s6_addr[0] == 0xFE && addr.s6_addr[1] == 0x80;
445 }
446 
447 // According to http://www.ietf.org/rfc/rfc2373.txt, Appendix A, page 19.  An
448 // address which contains MAC will have its 11th and 12th bytes as FF:FE as well
449 // as the U/L bit as 1.
IPIsMacBased(const IPAddress & ip)450 bool IPIsMacBased(const IPAddress& ip) {
451   in6_addr addr = ip.ipv6_address();
452   return ((addr.s6_addr[8] & 0x02) && addr.s6_addr[11] == 0xFF &&
453           addr.s6_addr[12] == 0xFE);
454 }
455 
IPIsSiteLocal(const IPAddress & ip)456 bool IPIsSiteLocal(const IPAddress& ip) {
457   // Can't use the helper because the prefix is 10 bits.
458   in6_addr addr = ip.ipv6_address();
459   return addr.s6_addr[0] == 0xFE && (addr.s6_addr[1] & 0xC0) == 0xC0;
460 }
461 
IPIsULA(const IPAddress & ip)462 bool IPIsULA(const IPAddress& ip) {
463   // Can't use the helper because the prefix is 7 bits.
464   in6_addr addr = ip.ipv6_address();
465   return (addr.s6_addr[0] & 0xFE) == 0xFC;
466 }
467 
IPIsTeredo(const IPAddress & ip)468 bool IPIsTeredo(const IPAddress& ip) {
469   return IPIsHelper(ip, kTeredoPrefix, 32);
470 }
471 
IPIsV4Compatibility(const IPAddress & ip)472 bool IPIsV4Compatibility(const IPAddress& ip) {
473   return IPIsHelper(ip, kV4CompatibilityPrefix, 96);
474 }
475 
IPIsV4Mapped(const IPAddress & ip)476 bool IPIsV4Mapped(const IPAddress& ip) {
477   return IPIsHelper(ip, kV4MappedPrefix, 96);
478 }
479 
IPAddressPrecedence(const IPAddress & ip)480 int IPAddressPrecedence(const IPAddress& ip) {
481   // Precedence values from RFC 3484-bis. Prefers native v4 over 6to4/Teredo.
482   if (ip.family() == AF_INET) {
483     return 30;
484   } else if (ip.family() == AF_INET6) {
485     if (IPIsLoopback(ip)) {
486       return 60;
487     } else if (IPIsULA(ip)) {
488       return 50;
489     } else if (IPIsV4Mapped(ip)) {
490       return 30;
491     } else if (IPIs6To4(ip)) {
492       return 20;
493     } else if (IPIsTeredo(ip)) {
494       return 10;
495     } else if (IPIsV4Compatibility(ip) || IPIsSiteLocal(ip) || IPIs6Bone(ip)) {
496       return 1;
497     } else {
498       // A 'normal' IPv6 address.
499       return 40;
500     }
501   }
502   return 0;
503 }
504 
GetLoopbackIP(int family)505 IPAddress GetLoopbackIP(int family) {
506   if (family == AF_INET) {
507     return rtc::IPAddress(INADDR_LOOPBACK);
508   }
509   if (family == AF_INET6) {
510     return rtc::IPAddress(in6addr_loopback);
511   }
512   return rtc::IPAddress();
513 }
514 
GetAnyIP(int family)515 IPAddress GetAnyIP(int family) {
516   if (family == AF_INET) {
517     return rtc::IPAddress(INADDR_ANY);
518   }
519   if (family == AF_INET6) {
520     return rtc::IPAddress(in6addr_any);
521   }
522   return rtc::IPAddress();
523 }
524 
525 }  // Namespace rtc
526