ffmpeg/libavformat/network.c

   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 }