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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 _DEFAULT_SOURCE
25 #define _SVID_SOURCE
26 
27 #include "config.h"
28 #include "avformat.h"
29 #include "os_support.h"
30 
31 #if CONFIG_NETWORK
32 #include <fcntl.h>
33 #if !HAVE_POLL_H
34 #if HAVE_SYS_TIME_H
35 #include <sys/time.h>
36 #endif /* HAVE_SYS_TIME_H */
37 #if HAVE_WINSOCK2_H
38 #include <winsock2.h>
39 #elif HAVE_SYS_SELECT_H
40 #include <sys/select.h>
41 #endif /* HAVE_WINSOCK2_H */
42 #endif /* !HAVE_POLL_H */
43 
44 #include "network.h"
45 
46 #if !HAVE_INET_ATON
47 #include <stdlib.h>
48 
49 int ff_inet_aton(const char *str, struct in_addr *add)
50 {
51  unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
52 
53  if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
54  return 0;
55 
56  if (!add1 || (add1 | add2 | add3 | add4) > 255)
57  return 0;
58 
59  add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
60 
61  return 1;
62 }
63 #else
64 int ff_inet_aton(const char *str, struct in_addr *add)
65 {
66  return inet_aton(str, add);
67 }
68 #endif /* !HAVE_INET_ATON */
69 
70 #if !HAVE_GETADDRINFO
71 int ff_getaddrinfo(const char *node, const char *service,
72  const struct addrinfo *hints, struct addrinfo **res)
73 {
74  struct hostent *h = NULL;
75  struct addrinfo *ai;
76  struct sockaddr_in *sin;
77 
78 #if HAVE_WINSOCK2_H
79  int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
80  const struct addrinfo *hints,
81  struct addrinfo **res);
82  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
83  win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
84  if (win_getaddrinfo)
85  return win_getaddrinfo(node, service, hints, res);
86 #endif /* HAVE_WINSOCK2_H */
87 
88  *res = NULL;
89  sin = av_mallocz(sizeof(struct sockaddr_in));
90  if (!sin)
91  return EAI_FAIL;
92  sin->sin_family = AF_INET;
93 
94  if (node) {
95  if (!ff_inet_aton(node, &sin->sin_addr)) {
96  if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
97  av_free(sin);
98  return EAI_FAIL;
99  }
100  h = gethostbyname(node);
101  if (!h) {
102  av_free(sin);
103  return EAI_FAIL;
104  }
105  memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
106  }
107  } else {
108  if (hints && (hints->ai_flags & AI_PASSIVE))
109  sin->sin_addr.s_addr = INADDR_ANY;
110  else
111  sin->sin_addr.s_addr = INADDR_LOOPBACK;
112  }
113 
114  /* Note: getaddrinfo allows service to be a string, which
115  * should be looked up using getservbyname. */
116  if (service)
117  sin->sin_port = htons(atoi(service));
118 
119  ai = av_mallocz(sizeof(struct addrinfo));
120  if (!ai) {
121  av_free(sin);
122  return EAI_FAIL;
123  }
124 
125  *res = ai;
126  ai->ai_family = AF_INET;
127  ai->ai_socktype = hints ? hints->ai_socktype : 0;
128  switch (ai->ai_socktype) {
129  case SOCK_STREAM:
130  ai->ai_protocol = IPPROTO_TCP;
131  break;
132  case SOCK_DGRAM:
133  ai->ai_protocol = IPPROTO_UDP;
134  break;
135  default:
136  ai->ai_protocol = 0;
137  break;
138  }
139 
140  ai->ai_addr = (struct sockaddr *)sin;
141  ai->ai_addrlen = sizeof(struct sockaddr_in);
142  if (hints && (hints->ai_flags & AI_CANONNAME))
143  ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
144 
145  ai->ai_next = NULL;
146  return 0;
147 }
148 
149 void ff_freeaddrinfo(struct addrinfo *res)
150 {
151 #if HAVE_WINSOCK2_H
152  void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
153  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
154  win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
155  GetProcAddress(ws2mod, "freeaddrinfo");
156  if (win_freeaddrinfo) {
157  win_freeaddrinfo(res);
158  return;
159  }
160 #endif /* HAVE_WINSOCK2_H */
161 
162  av_free(res->ai_canonname);
163  av_free(res->ai_addr);
164  av_free(res);
165 }
166 
167 int ff_getnameinfo(const struct sockaddr *sa, int salen,
168  char *host, int hostlen,
169  char *serv, int servlen, int flags)
170 {
171  const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
172 
173 #if HAVE_WINSOCK2_H
174  int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
175  char *host, DWORD hostlen,
176  char *serv, DWORD servlen, int flags);
177  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
178  win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
179  if (win_getnameinfo)
180  return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
181 #endif /* HAVE_WINSOCK2_H */
182 
183  if (sa->sa_family != AF_INET)
184  return EAI_FAMILY;
185  if (!host && !serv)
186  return EAI_NONAME;
187 
188  if (host && hostlen > 0) {
189  struct hostent *ent = NULL;
190  uint32_t a;
191  if (!(flags & NI_NUMERICHOST))
192  ent = gethostbyaddr((const char *)&sin->sin_addr,
193  sizeof(sin->sin_addr), AF_INET);
194 
195  if (ent) {
196  snprintf(host, hostlen, "%s", ent->h_name);
197  } else if (flags & NI_NAMERQD) {
198  return EAI_NONAME;
199  } else {
200  a = ntohl(sin->sin_addr.s_addr);
201  snprintf(host, hostlen, "%d.%d.%d.%d",
202  ((a >> 24) & 0xff), ((a >> 16) & 0xff),
203  ((a >> 8) & 0xff), (a & 0xff));
204  }
205  }
206 
207  if (serv && servlen > 0) {
208  struct servent *ent = NULL;
209 #if HAVE_GETSERVBYPORT
210  if (!(flags & NI_NUMERICSERV))
211  ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
212 #endif /* HAVE_GETSERVBYPORT */
213 
214  if (ent)
215  snprintf(serv, servlen, "%s", ent->s_name);
216  else
217  snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
218  }
219 
220  return 0;
221 }
222 #endif /* !HAVE_GETADDRINFO */
223 
224 #if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H
225 const char *ff_gai_strerror(int ecode)
226 {
227  switch (ecode) {
228  case EAI_AGAIN:
229  return "Temporary failure in name resolution";
230  case EAI_BADFLAGS:
231  return "Invalid flags for ai_flags";
232  case EAI_FAIL:
233  return "A non-recoverable error occurred";
234  case EAI_FAMILY:
235  return "The address family was not recognized or the address "
236  "length was invalid for the specified family";
237  case EAI_MEMORY:
238  return "Memory allocation failure";
239 #if EAI_NODATA != EAI_NONAME
240  case EAI_NODATA:
241  return "No address associated with hostname";
242 #endif /* EAI_NODATA != EAI_NONAME */
243  case EAI_NONAME:
244  return "The name does not resolve for the supplied parameters";
245  case EAI_SERVICE:
246  return "servname not supported for ai_socktype";
247  case EAI_SOCKTYPE:
248  return "ai_socktype not supported";
249  }
250 
251  return "Unknown error";
252 }
253 #endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */
254 
255 int ff_socket_nonblock(int socket, int enable)
256 {
257 #if HAVE_WINSOCK2_H
258  u_long param = enable;
259  return ioctlsocket(socket, FIONBIO, &param);
260 #else
261  if (enable)
262  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
263  else
264  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
265 #endif /* HAVE_WINSOCK2_H */
266 }
267 
268 #if !HAVE_POLL_H
269 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout)
270 {
271  fd_set read_set;
272  fd_set write_set;
273  fd_set exception_set;
274  nfds_t i;
275  int n;
276  int rc;
277 
278 #if HAVE_WINSOCK2_H
279  if (numfds >= FD_SETSIZE) {
280  errno = EINVAL;
281  return -1;
282  }
283 #endif /* HAVE_WINSOCK2_H */
284 
285  FD_ZERO(&read_set);
286  FD_ZERO(&write_set);
287  FD_ZERO(&exception_set);
288 
289  n = 0;
290  for (i = 0; i < numfds; i++) {
291  if (fds[i].fd < 0)
292  continue;
293 #if !HAVE_WINSOCK2_H
294  if (fds[i].fd >= FD_SETSIZE) {
295  errno = EINVAL;
296  return -1;
297  }
298 #endif /* !HAVE_WINSOCK2_H */
299 
300  if (fds[i].events & POLLIN)
301  FD_SET(fds[i].fd, &read_set);
302  if (fds[i].events & POLLOUT)
303  FD_SET(fds[i].fd, &write_set);
304  if (fds[i].events & POLLERR)
305  FD_SET(fds[i].fd, &exception_set);
306 
307  if (fds[i].fd >= n)
308  n = fds[i].fd + 1;
309  }
310 
311  if (n == 0)
312  /* Hey!? Nothing to poll, in fact!!! */
313  return 0;
314 
315  if (timeout < 0) {
316  rc = select(n, &read_set, &write_set, &exception_set, NULL);
317  } else {
318  struct timeval tv;
319  tv.tv_sec = timeout / 1000;
320  tv.tv_usec = 1000 * (timeout % 1000);
321  rc = select(n, &read_set, &write_set, &exception_set, &tv);
322  }
323 
324  if (rc < 0)
325  return rc;
326 
327  for (i = 0; i < numfds; i++) {
328  fds[i].revents = 0;
329 
330  if (FD_ISSET(fds[i].fd, &read_set))
331  fds[i].revents |= POLLIN;
332  if (FD_ISSET(fds[i].fd, &write_set))
333  fds[i].revents |= POLLOUT;
334  if (FD_ISSET(fds[i].fd, &exception_set))
335  fds[i].revents |= POLLERR;
336  }
337 
338  return rc;
339 }
340 #endif /* !HAVE_POLL_H */
341 
342 #endif /* CONFIG_NETWORK */