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network.c
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1 /*
2  * Copyright (c) 2007 The FFmpeg Project
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <fcntl.h>
22 #include "network.h"
23 #include "url.h"
24 #include "libavcodec/internal.h"
25 #include "libavutil/avutil.h"
26 #include "libavutil/mem.h"
27 #include "libavutil/time.h"
28 
29 #if HAVE_THREADS
30 #if HAVE_PTHREADS
31 #include <pthread.h>
32 #elif HAVE_OS2THREADS
33 #include "compat/os2threads.h"
34 #else
35 #include "compat/w32pthreads.h"
36 #endif
37 #endif
38 
39 #if CONFIG_OPENSSL
40 #include <openssl/ssl.h>
41 static int openssl_init;
42 #if HAVE_THREADS
43 #include <openssl/crypto.h>
44 pthread_mutex_t *openssl_mutexes;
45 static void openssl_lock(int mode, int type, const char *file, int line)
46 {
47  if (mode & CRYPTO_LOCK)
48  pthread_mutex_lock(&openssl_mutexes[type]);
49  else
50  pthread_mutex_unlock(&openssl_mutexes[type]);
51 }
52 #if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
53 static unsigned long openssl_thread_id(void)
54 {
55  return (intptr_t) pthread_self();
56 }
57 #endif
58 #endif
59 #endif
60 #if CONFIG_GNUTLS
61 #include <gnutls/gnutls.h>
62 #if HAVE_THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
63 #include <gcrypt.h>
64 #include <errno.h>
65 GCRY_THREAD_OPTION_PTHREAD_IMPL;
66 #endif
67 #endif
68 
69 void ff_tls_init(void)
70 {
71  avpriv_lock_avformat();
72 #if CONFIG_OPENSSL
73  if (!openssl_init) {
74  SSL_library_init();
75  SSL_load_error_strings();
76 #if HAVE_THREADS
77  if (!CRYPTO_get_locking_callback()) {
78  int i;
79  openssl_mutexes = av_malloc_array(sizeof(pthread_mutex_t), CRYPTO_num_locks());
80  for (i = 0; i < CRYPTO_num_locks(); i++)
81  pthread_mutex_init(&openssl_mutexes[i], NULL);
82  CRYPTO_set_locking_callback(openssl_lock);
83 #if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
84  CRYPTO_set_id_callback(openssl_thread_id);
85 #endif
86  }
87 #endif
88  }
89  openssl_init++;
90 #endif
91 #if CONFIG_GNUTLS
92 #if HAVE_THREADS && GNUTLS_VERSION_NUMBER < 0x020b00
93  if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0)
94  gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
95 #endif
96  gnutls_global_init();
97 #endif
98  avpriv_unlock_avformat();
99 }
100 
101 void ff_tls_deinit(void)
102 {
103  avpriv_lock_avformat();
104 #if CONFIG_OPENSSL
105  openssl_init--;
106  if (!openssl_init) {
107 #if HAVE_THREADS
108  if (CRYPTO_get_locking_callback() == openssl_lock) {
109  int i;
110  CRYPTO_set_locking_callback(NULL);
111  for (i = 0; i < CRYPTO_num_locks(); i++)
112  pthread_mutex_destroy(&openssl_mutexes[i]);
113  av_free(openssl_mutexes);
114  }
115 #endif
116  }
117 #endif
118 #if CONFIG_GNUTLS
119  gnutls_global_deinit();
120 #endif
121  avpriv_unlock_avformat();
122 }
123 
124 int ff_network_inited_globally;
125 
126 int ff_network_init(void)
127 {
128 #if HAVE_WINSOCK2_H
129  WSADATA wsaData;
130 #endif
131 
132  if (!ff_network_inited_globally)
133  av_log(NULL, AV_LOG_WARNING, "Using network protocols without global "
134  "network initialization. Please use "
135  "avformat_network_init(), this will "
136  "become mandatory later.\n");
137 #if HAVE_WINSOCK2_H
138  if (WSAStartup(MAKEWORD(1,1), &wsaData))
139  return 0;
140 #endif
141  return 1;
142 }
143 
144 int ff_network_wait_fd(int fd, int write)
145 {
146  int ev = write ? POLLOUT : POLLIN;
147  struct pollfd p = { .fd = fd, .events = ev, .revents = 0 };
148  int ret;
149  ret = poll(&p, 1, 100);
150  return ret < 0 ? ff_neterrno() : p.revents & (ev | POLLERR | POLLHUP) ? 0 : AVERROR(EAGAIN);
151 }
152 
153 int ff_network_wait_fd_timeout(int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
154 {
155  int ret;
156  int64_t wait_start = 0;
157 
158  while (1) {
159  if (ff_check_interrupt(int_cb))
160  return AVERROR_EXIT;
161  ret = ff_network_wait_fd(fd, write);
162  if (ret != AVERROR(EAGAIN))
163  return ret;
164  if (timeout > 0) {
165  if (!wait_start)
166  wait_start = av_gettime_relative();
167  else if (av_gettime_relative() - wait_start > timeout)
168  return AVERROR(ETIMEDOUT);
169  }
170  }
171 }
172 
173 void ff_network_close(void)
174 {
175 #if HAVE_WINSOCK2_H
176  WSACleanup();
177 #endif
178 }
179 
180 #if HAVE_WINSOCK2_H
181 int ff_neterrno(void)
182 {
183  int err = WSAGetLastError();
184  switch (err) {
185  case WSAEWOULDBLOCK:
186  return AVERROR(EAGAIN);
187  case WSAEINTR:
188  return AVERROR(EINTR);
189  case WSAEPROTONOSUPPORT:
190  return AVERROR(EPROTONOSUPPORT);
191  case WSAETIMEDOUT:
192  return AVERROR(ETIMEDOUT);
193  case WSAECONNREFUSED:
194  return AVERROR(ECONNREFUSED);
195  case WSAEINPROGRESS:
196  return AVERROR(EINPROGRESS);
197  }
198  return -err;
199 }
200 #endif
201 
202 int ff_is_multicast_address(struct sockaddr *addr)
203 {
204  if (addr->sa_family == AF_INET) {
205  return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
206  }
207 #if HAVE_STRUCT_SOCKADDR_IN6
208  if (addr->sa_family == AF_INET6) {
209  return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
210  }
211 #endif
212 
213  return 0;
214 }
215 
216 static int ff_poll_interrupt(struct pollfd *p, nfds_t nfds, int timeout,
217  AVIOInterruptCB *cb)
218 {
219  int runs = timeout / POLLING_TIME;
220  int ret = 0;
221 
222  do {
223  if (ff_check_interrupt(cb))
224  return AVERROR_EXIT;
225  ret = poll(p, nfds, POLLING_TIME);
226  if (ret != 0)
227  break;
228  } while (timeout <= 0 || runs-- > 0);
229 
230  if (!ret)
231  return AVERROR(ETIMEDOUT);
232  if (ret < 0)
233  return AVERROR(errno);
234  return ret;
235 }
236 
237 int ff_socket(int af, int type, int proto)
238 {
239  int fd;
240 
241 #ifdef SOCK_CLOEXEC
242  fd = socket(af, type | SOCK_CLOEXEC, proto);
243  if (fd == -1 && errno == EINVAL)
244 #endif
245  {
246  fd = socket(af, type, proto);
247 #if HAVE_FCNTL
248  if (fd != -1) {
249  if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
250  av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
251  }
252 #endif
253  }
254  return fd;
255 }
256 
257 int ff_listen_bind(int fd, const struct sockaddr *addr,
258  socklen_t addrlen, int timeout, URLContext *h)
259 {
260  int ret;
261  int reuse = 1;
262  struct pollfd lp = { fd, POLLIN, 0 };
263  if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))) {
264  av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_REUSEADDR) failed\n");
265  }
266  ret = bind(fd, addr, addrlen);
267  if (ret)
268  return ff_neterrno();
269 
270  ret = listen(fd, 1);
271  if (ret)
272  return ff_neterrno();
273 
274  ret = ff_poll_interrupt(&lp, 1, timeout, &h->interrupt_callback);
275  if (ret < 0)
276  return ret;
277 
278  ret = accept(fd, NULL, NULL);
279  if (ret < 0)
280  return ff_neterrno();
281 
282  closesocket(fd);
283 
284  if (ff_socket_nonblock(ret, 1) < 0)
285  av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
286 
287  return ret;
288 }
289 
290 int ff_listen_connect(int fd, const struct sockaddr *addr,
291  socklen_t addrlen, int timeout, URLContext *h,
292  int will_try_next)
293 {
294  struct pollfd p = {fd, POLLOUT, 0};
295  int ret;
296  socklen_t optlen;
297 
298  if (ff_socket_nonblock(fd, 1) < 0)
299  av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
300 
301  while ((ret = connect(fd, addr, addrlen))) {
302  ret = ff_neterrno();
303  switch (ret) {
304  case AVERROR(EINTR):
305  if (ff_check_interrupt(&h->interrupt_callback))
306  return AVERROR_EXIT;
307  continue;
308  case AVERROR(EINPROGRESS):
309  case AVERROR(EAGAIN):
310  ret = ff_poll_interrupt(&p, 1, timeout, &h->interrupt_callback);
311  if (ret < 0)
312  return ret;
313  optlen = sizeof(ret);
314  if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen))
315  ret = AVUNERROR(ff_neterrno());
316  if (ret != 0) {
317  char errbuf[100];
318  ret = AVERROR(ret);
319  av_strerror(ret, errbuf, sizeof(errbuf));
320  if (will_try_next)
321  av_log(h, AV_LOG_WARNING,
322  "Connection to %s failed (%s), trying next address\n",
323  h->filename, errbuf);
324  else
325  av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
326  h->filename, errbuf);
327  }
328  default:
329  return ret;
330  }
331  }
332  return ret;
333 }
334 
335 static int match_host_pattern(const char *pattern, const char *hostname)
336 {
337  int len_p, len_h;
338  if (!strcmp(pattern, "*"))
339  return 1;
340  // Skip a possible *. at the start of the pattern
341  if (pattern[0] == '*')
342  pattern++;
343  if (pattern[0] == '.')
344  pattern++;
345  len_p = strlen(pattern);
346  len_h = strlen(hostname);
347  if (len_p > len_h)
348  return 0;
349  // Simply check if the end of hostname is equal to 'pattern'
350  if (!strcmp(pattern, &hostname[len_h - len_p])) {
351  if (len_h == len_p)
352  return 1; // Exact match
353  if (hostname[len_h - len_p - 1] == '.')
354  return 1; // The matched substring is a domain and not just a substring of a domain
355  }
356  return 0;
357 }
358 
359 int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
360 {
361  char *buf, *start;
362  int ret = 0;
363  if (!no_proxy)
364  return 0;
365  if (!hostname)
366  return 0;
367  buf = av_strdup(no_proxy);
368  if (!buf)
369  return 0;
370  start = buf;
371  while (start) {
372  char *sep, *next = NULL;
373  start += strspn(start, " ,");
374  sep = start + strcspn(start, " ,");
375  if (*sep) {
376  next = sep + 1;
377  *sep = '\0';
378  }
379  if (match_host_pattern(start, hostname)) {
380  ret = 1;
381  break;
382  }
383  start = next;
384  }
385  av_free(buf);
386  return ret;
387 }
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