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os_support.c
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1 /*
2  * various OS-feature replacement utilities
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  * copyright (c) 2002 Francois Revol
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /* needed by inet_aton() */
24 #define _SVID_SOURCE
25 
26 #include "config.h"
27 #include "avformat.h"
28 #include "os_support.h"
29 
30 #if CONFIG_NETWORK
31 #include <fcntl.h>
32 #if !HAVE_POLL_H
33 #if HAVE_SYS_TIME_H
34 #include <sys/time.h>
35 #endif
36 #if HAVE_WINSOCK2_H
37 #include <winsock2.h>
38 #elif HAVE_SYS_SELECT_H
39 #include <sys/select.h>
40 #endif
41 #endif
42 
43 #include "network.h"
44 
45 #if !HAVE_INET_ATON
46 #include <stdlib.h>
47 
48 int ff_inet_aton(const char *str, struct in_addr *add)
49 {
50  unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
51 
52  if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
53  return 0;
54 
55  if (!add1 || (add1 | add2 | add3 | add4) > 255)
56  return 0;
57 
58  add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
59 
60  return 1;
61 }
62 #else
63 int ff_inet_aton(const char *str, struct in_addr *add)
64 {
65  return inet_aton(str, add);
66 }
67 #endif /* !HAVE_INET_ATON */
68 
69 #if !HAVE_GETADDRINFO
70 int ff_getaddrinfo(const char *node, const char *service,
71  const struct addrinfo *hints, struct addrinfo **res)
72 {
73  struct hostent *h = NULL;
74  struct addrinfo *ai;
75  struct sockaddr_in *sin;
76 
77 #if HAVE_WINSOCK2_H
78  int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
79  const struct addrinfo *hints,
80  struct addrinfo **res);
81  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
82  win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
83  if (win_getaddrinfo)
84  return win_getaddrinfo(node, service, hints, res);
85 #endif
86 
87  *res = NULL;
88  sin = av_mallocz(sizeof(struct sockaddr_in));
89  if (!sin)
90  return EAI_FAIL;
91  sin->sin_family = AF_INET;
92 
93  if (node) {
94  if (!ff_inet_aton(node, &sin->sin_addr)) {
95  if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
96  av_free(sin);
97  return EAI_FAIL;
98  }
99  h = gethostbyname(node);
100  if (!h) {
101  av_free(sin);
102  return EAI_FAIL;
103  }
104  memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
105  }
106  } else {
107  if (hints && (hints->ai_flags & AI_PASSIVE))
108  sin->sin_addr.s_addr = INADDR_ANY;
109  else
110  sin->sin_addr.s_addr = INADDR_LOOPBACK;
111  }
112 
113  /* Note: getaddrinfo allows service to be a string, which
114  * should be looked up using getservbyname. */
115  if (service)
116  sin->sin_port = htons(atoi(service));
117 
118  ai = av_mallocz(sizeof(struct addrinfo));
119  if (!ai) {
120  av_free(sin);
121  return EAI_FAIL;
122  }
123 
124  *res = ai;
125  ai->ai_family = AF_INET;
126  ai->ai_socktype = hints ? hints->ai_socktype : 0;
127  switch (ai->ai_socktype) {
128  case SOCK_STREAM:
129  ai->ai_protocol = IPPROTO_TCP;
130  break;
131  case SOCK_DGRAM:
132  ai->ai_protocol = IPPROTO_UDP;
133  break;
134  default:
135  ai->ai_protocol = 0;
136  break;
137  }
138 
139  ai->ai_addr = (struct sockaddr *)sin;
140  ai->ai_addrlen = sizeof(struct sockaddr_in);
141  if (hints && (hints->ai_flags & AI_CANONNAME))
142  ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
143 
144  ai->ai_next = NULL;
145  return 0;
146 }
147 
148 void ff_freeaddrinfo(struct addrinfo *res)
149 {
150 #if HAVE_WINSOCK2_H
151  void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
152  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
153  win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
154  GetProcAddress(ws2mod, "freeaddrinfo");
155  if (win_freeaddrinfo) {
156  win_freeaddrinfo(res);
157  return;
158  }
159 #endif
160 
161  av_free(res->ai_canonname);
162  av_free(res->ai_addr);
163  av_free(res);
164 }
165 
166 int ff_getnameinfo(const struct sockaddr *sa, int salen,
167  char *host, int hostlen,
168  char *serv, int servlen, int flags)
169 {
170  const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
171 
172 #if HAVE_WINSOCK2_H
173  int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
174  char *host, DWORD hostlen,
175  char *serv, DWORD servlen, int flags);
176  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
177  win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
178  if (win_getnameinfo)
179  return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
180 #endif
181 
182  if (sa->sa_family != AF_INET)
183  return EAI_FAMILY;
184  if (!host && !serv)
185  return EAI_NONAME;
186 
187  if (host && hostlen > 0) {
188  struct hostent *ent = NULL;
189  uint32_t a;
190  if (!(flags & NI_NUMERICHOST))
191  ent = gethostbyaddr((const char *)&sin->sin_addr,
192  sizeof(sin->sin_addr), AF_INET);
193 
194  if (ent) {
195  snprintf(host, hostlen, "%s", ent->h_name);
196  } else if (flags & NI_NAMERQD) {
197  return EAI_NONAME;
198  } else {
199  a = ntohl(sin->sin_addr.s_addr);
200  snprintf(host, hostlen, "%d.%d.%d.%d",
201  ((a >> 24) & 0xff), ((a >> 16) & 0xff),
202  ((a >> 8) & 0xff), (a & 0xff));
203  }
204  }
205 
206  if (serv && servlen > 0) {
207  struct servent *ent = NULL;
208 #if HAVE_GETSERVBYPORT
209  if (!(flags & NI_NUMERICSERV))
210  ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
211 #endif
212 
213  if (ent)
214  snprintf(serv, servlen, "%s", ent->s_name);
215  else
216  snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
217  }
218 
219  return 0;
220 }
221 #endif /* !HAVE_GETADDRINFO */
222 
223 #if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H
224 const char *ff_gai_strerror(int ecode)
225 {
226  switch (ecode) {
227  case EAI_AGAIN:
228  return "Temporary failure in name resolution";
229  case EAI_BADFLAGS:
230  return "Invalid flags for ai_flags";
231  case EAI_FAIL:
232  return "A non-recoverable error occurred";
233  case EAI_FAMILY:
234  return "The address family was not recognized or the address "
235  "length was invalid for the specified family";
236  case EAI_MEMORY:
237  return "Memory allocation failure";
238 #if EAI_NODATA != EAI_NONAME
239  case EAI_NODATA:
240  return "No address associated with hostname";
241 #endif
242  case EAI_NONAME:
243  return "The name does not resolve for the supplied parameters";
244  case EAI_SERVICE:
245  return "servname not supported for ai_socktype";
246  case EAI_SOCKTYPE:
247  return "ai_socktype not supported";
248  }
249 
250  return "Unknown error";
251 }
252 #endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */
253 
254 int ff_socket_nonblock(int socket, int enable)
255 {
256 #if HAVE_WINSOCK2_H
257  u_long param = enable;
258  return ioctlsocket(socket, FIONBIO, &param);
259 #else
260  if (enable)
261  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
262  else
263  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
264 #endif
265 }
266 
267 #if !HAVE_POLL_H
268 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout)
269 {
270  fd_set read_set;
271  fd_set write_set;
272  fd_set exception_set;
273  nfds_t i;
274  int n;
275  int rc;
276 
277 #if HAVE_WINSOCK2_H
278  if (numfds >= FD_SETSIZE) {
279  errno = EINVAL;
280  return -1;
281  }
282 #endif
283 
284  FD_ZERO(&read_set);
285  FD_ZERO(&write_set);
286  FD_ZERO(&exception_set);
287 
288  n = 0;
289  for (i = 0; i < numfds; i++) {
290  if (fds[i].fd < 0)
291  continue;
292 #if !HAVE_WINSOCK2_H
293  if (fds[i].fd >= FD_SETSIZE) {
294  errno = EINVAL;
295  return -1;
296  }
297 #endif
298 
299  if (fds[i].events & POLLIN)
300  FD_SET(fds[i].fd, &read_set);
301  if (fds[i].events & POLLOUT)
302  FD_SET(fds[i].fd, &write_set);
303  if (fds[i].events & POLLERR)
304  FD_SET(fds[i].fd, &exception_set);
305 
306  if (fds[i].fd >= n)
307  n = fds[i].fd + 1;
308  }
309 
310  if (n == 0)
311  /* Hey!? Nothing to poll, in fact!!! */
312  return 0;
313 
314  if (timeout < 0) {
315  rc = select(n, &read_set, &write_set, &exception_set, NULL);
316  } else {
317  struct timeval tv;
318  tv.tv_sec = timeout / 1000;
319  tv.tv_usec = 1000 * (timeout % 1000);
320  rc = select(n, &read_set, &write_set, &exception_set, &tv);
321  }
322 
323  if (rc < 0)
324  return rc;
325 
326  for (i = 0; i < numfds; i++) {
327  fds[i].revents = 0;
328 
329  if (FD_ISSET(fds[i].fd, &read_set))
330  fds[i].revents |= POLLIN;
331  if (FD_ISSET(fds[i].fd, &write_set))
332  fds[i].revents |= POLLOUT;
333  if (FD_ISSET(fds[i].fd, &exception_set))
334  fds[i].revents |= POLLERR;
335  }
336 
337  return rc;
338 }
339 #endif /* HAVE_POLL_H */
340 #endif /* CONFIG_NETWORK */