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 
24 #define THREADS (HAVE_PTHREADS || (defined(WIN32) && !defined(__MINGW32CE__)))
25 
26 #if THREADS
27 #if HAVE_PTHREADS
28 #include <pthread.h>
29 #else
30 #include "libavcodec/w32pthreads.h"
31 #endif
32 #endif
33 
34 #if CONFIG_OPENSSL
35 #include <openssl/ssl.h>
36 static int openssl_init;
37 #if THREADS
38 #include <openssl/crypto.h>
39 #include "libavutil/avutil.h"
40 pthread_mutex_t *openssl_mutexes;
41 static void openssl_lock(int mode, int type, const char *file, int line)
42 {
43  if (mode & CRYPTO_LOCK)
44  pthread_mutex_lock(&openssl_mutexes[type]);
45  else
46  pthread_mutex_unlock(&openssl_mutexes[type]);
47 }
48 #if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
49 static unsigned long openssl_thread_id(void)
50 {
51  return (intptr_t) pthread_self();
52 }
53 #endif
54 #endif
55 #endif
56 #if CONFIG_GNUTLS
57 #include <gnutls/gnutls.h>
58 #if THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
59 #include <gcrypt.h>
60 #include <errno.h>
61 #undef malloc
62 #undef free
63 GCRY_THREAD_OPTION_PTHREAD_IMPL;
64 #endif
65 #endif
66 
67 void ff_tls_init(void)
68 {
70 #if CONFIG_OPENSSL
71  if (!openssl_init) {
72  SSL_library_init();
73  SSL_load_error_strings();
74 #if THREADS
75  if (!CRYPTO_get_locking_callback()) {
76  int i;
77  openssl_mutexes = av_malloc(sizeof(pthread_mutex_t) * CRYPTO_num_locks());
78  for (i = 0; i < CRYPTO_num_locks(); i++)
79  pthread_mutex_init(&openssl_mutexes[i], NULL);
80  CRYPTO_set_locking_callback(openssl_lock);
81 #if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
82  CRYPTO_set_id_callback(openssl_thread_id);
83 #endif
84  }
85 #endif
86  }
87  openssl_init++;
88 #endif
89 #if CONFIG_GNUTLS
90 #if THREADS && GNUTLS_VERSION_NUMBER < 0x020b00
91  if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0)
92  gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
93 #endif
94  gnutls_global_init();
95 #endif
97 }
98 
99 void ff_tls_deinit(void)
100 {
102 #if CONFIG_OPENSSL
103  openssl_init--;
104  if (!openssl_init) {
105 #if THREADS
106  if (CRYPTO_get_locking_callback() == openssl_lock) {
107  int i;
108  CRYPTO_set_locking_callback(NULL);
109  for (i = 0; i < CRYPTO_num_locks(); i++)
110  pthread_mutex_destroy(&openssl_mutexes[i]);
111  av_free(openssl_mutexes);
112  }
113 #endif
114  }
115 #endif
116 #if CONFIG_GNUTLS
117  gnutls_global_deinit();
118 #endif
120 }
121 
123 
125 {
126 #if HAVE_WINSOCK2_H
127  WSADATA wsaData;
128 #endif
129 
130  if (!ff_network_inited_globally)
131  av_log(NULL, AV_LOG_WARNING, "Using network protocols without global "
132  "network initialization. Please use "
133  "avformat_network_init(), this will "
134  "become mandatory later.\n");
135 #if HAVE_WINSOCK2_H
136  if (WSAStartup(MAKEWORD(1,1), &wsaData))
137  return 0;
138 #endif
139  return 1;
140 }
141 
142 int ff_network_wait_fd(int fd, int write)
143 {
144  int ev = write ? POLLOUT : POLLIN;
145  struct pollfd p = { .fd = fd, .events = ev, .revents = 0 };
146  int ret;
147  ret = poll(&p, 1, 100);
148  return ret < 0 ? ff_neterrno() : p.revents & (ev | POLLERR | POLLHUP) ? 0 : AVERROR(EAGAIN);
149 }
150 
152 {
153 #if HAVE_WINSOCK2_H
154  WSACleanup();
155 #endif
156 }
157 
158 #if HAVE_WINSOCK2_H
159 int ff_neterrno(void)
160 {
161  int err = WSAGetLastError();
162  switch (err) {
163  case WSAEWOULDBLOCK:
164  return AVERROR(EAGAIN);
165  case WSAEINTR:
166  return AVERROR(EINTR);
167  }
168  return -err;
169 }
170 #endif
171 
172 int ff_is_multicast_address(struct sockaddr *addr)
173 {
174  if (addr->sa_family == AF_INET) {
175  return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
176  }
177 #if HAVE_STRUCT_SOCKADDR_IN6
178  if (addr->sa_family == AF_INET6) {
179  return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
180  }
181 #endif
182 
183  return 0;
184 }
185