network.c
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1 /*
2  * Copyright (c) 2007 The Libav Project
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "network.h"
22 #include "libavcodec/internal.h"
23 #include "libavutil/mem.h"
24 
25 #if HAVE_THREADS
26 #if HAVE_PTHREADS
27 #include <pthread.h>
28 #else
29 #include "libavcodec/w32pthreads.h"
30 #endif
31 #endif
32 
33 #if CONFIG_OPENSSL
34 #include <openssl/ssl.h>
35 static int openssl_init;
36 #if HAVE_THREADS
37 #include <openssl/crypto.h>
38 #include "libavutil/avutil.h"
39 pthread_mutex_t *openssl_mutexes;
40 static void openssl_lock(int mode, int type, const char *file, int line)
41 {
42  if (mode & CRYPTO_LOCK)
43  pthread_mutex_lock(&openssl_mutexes[type]);
44  else
45  pthread_mutex_unlock(&openssl_mutexes[type]);
46 }
47 #if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
48 static unsigned long openssl_thread_id(void)
49 {
50  return (intptr_t) pthread_self();
51 }
52 #endif
53 #endif
54 #endif
55 #if CONFIG_GNUTLS
56 #include <gnutls/gnutls.h>
57 #if HAVE_THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
58 #include <gcrypt.h>
59 #include <errno.h>
60 GCRY_THREAD_OPTION_PTHREAD_IMPL;
61 #endif
62 #endif
63 
64 void ff_tls_init(void)
65 {
67 #if CONFIG_OPENSSL
68  if (!openssl_init) {
69  SSL_library_init();
70  SSL_load_error_strings();
71 #if HAVE_THREADS
72  if (!CRYPTO_get_locking_callback()) {
73  int i;
74  openssl_mutexes = av_malloc(sizeof(pthread_mutex_t) * CRYPTO_num_locks());
75  for (i = 0; i < CRYPTO_num_locks(); i++)
76  pthread_mutex_init(&openssl_mutexes[i], NULL);
77  CRYPTO_set_locking_callback(openssl_lock);
78 #if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
79  CRYPTO_set_id_callback(openssl_thread_id);
80 #endif
81  }
82 #endif
83  }
84  openssl_init++;
85 #endif
86 #if CONFIG_GNUTLS
87 #if HAVE_THREADS && GNUTLS_VERSION_NUMBER < 0x020b00
88  if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0)
89  gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
90 #endif
91  gnutls_global_init();
92 #endif
94 }
95 
96 void ff_tls_deinit(void)
97 {
99 #if CONFIG_OPENSSL
100  openssl_init--;
101  if (!openssl_init) {
102 #if HAVE_THREADS
103  if (CRYPTO_get_locking_callback() == openssl_lock) {
104  int i;
105  CRYPTO_set_locking_callback(NULL);
106  for (i = 0; i < CRYPTO_num_locks(); i++)
107  pthread_mutex_destroy(&openssl_mutexes[i]);
108  av_free(openssl_mutexes);
109  }
110 #endif
111  }
112 #endif
113 #if CONFIG_GNUTLS
114  gnutls_global_deinit();
115 #endif
117 }
118 
120 
122 {
123 #if HAVE_WINSOCK2_H
124  WSADATA wsaData;
125 #endif
126 
127  if (!ff_network_inited_globally)
128  av_log(NULL, AV_LOG_WARNING, "Using network protocols without global "
129  "network initialization. Please use "
130  "avformat_network_init(), this will "
131  "become mandatory later.\n");
132 #if HAVE_WINSOCK2_H
133  if (WSAStartup(MAKEWORD(1,1), &wsaData))
134  return 0;
135 #endif
136  return 1;
137 }
138 
139 int ff_network_wait_fd(int fd, int write)
140 {
141  int ev = write ? POLLOUT : POLLIN;
142  struct pollfd p = { .fd = fd, .events = ev, .revents = 0 };
143  int ret;
144  ret = poll(&p, 1, 100);
145  return ret < 0 ? ff_neterrno() : p.revents & (ev | POLLERR | POLLHUP) ? 0 : AVERROR(EAGAIN);
146 }
147 
149 {
150 #if HAVE_WINSOCK2_H
151  WSACleanup();
152 #endif
153 }
154 
155 #if HAVE_WINSOCK2_H
156 int ff_neterrno(void)
157 {
158  int err = WSAGetLastError();
159  switch (err) {
160  case WSAEWOULDBLOCK:
161  return AVERROR(EAGAIN);
162  case WSAEINTR:
163  return AVERROR(EINTR);
164  case WSAEPROTONOSUPPORT:
165  return AVERROR(EPROTONOSUPPORT);
166  case WSAETIMEDOUT:
167  return AVERROR(ETIMEDOUT);
168  case WSAECONNREFUSED:
169  return AVERROR(ECONNREFUSED);
170  case WSAEINPROGRESS:
171  return AVERROR(EINPROGRESS);
172  }
173  return -err;
174 }
175 #endif
176 
177 int ff_is_multicast_address(struct sockaddr *addr)
178 {
179  if (addr->sa_family == AF_INET) {
180  return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
181  }
182 #if HAVE_STRUCT_SOCKADDR_IN6
183  if (addr->sa_family == AF_INET6) {
184  return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
185  }
186 #endif
187 
188  return 0;
189 }