libavformat/os_support.c

   1 /*
   2  * Various utilities for ffmpeg system
   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 #define _DARWIN_C_SOURCE
  26
  27 #include "config.h"
  28 #include "avformat.h"
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <sys/time.h>
  32 #include "os_support.h"
  33
  34 #if CONFIG_NETWORK
  35 #if !HAVE_POLL_H
  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 #include <strings.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) 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: ai->ai_protocol = IPPROTO_TCP; break;
 129     case SOCK_DGRAM:  ai->ai_protocol = IPPROTO_UDP; break;
 130     default:          ai->ai_protocol = 0;           break;
 131     }
 132
 133     ai->ai_addr = (struct sockaddr *)sin;
 134     ai->ai_addrlen = sizeof(struct sockaddr_in);
 135     if (hints && (hints->ai_flags & AI_CANONNAME))
 136         ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
 137
 138     ai->ai_next = NULL;
 139     return 0;
 140 }
 141
 142 void ff_freeaddrinfo(struct addrinfo *res)
 143 {
 144 #if HAVE_WINSOCK2_H
 145     void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
 146     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
 147     win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
 148                        GetProcAddress(ws2mod, "freeaddrinfo");
 149     if (win_freeaddrinfo) {
 150         win_freeaddrinfo(res);
 151         return;
 152     }
 153 #endif
 154
 155     av_free(res->ai_canonname);
 156     av_free(res->ai_addr);
 157     av_free(res);
 158 }
 159
 160 int ff_getnameinfo(const struct sockaddr *sa, int salen,
 161                    char *host, int hostlen,
 162                    char *serv, int servlen, int flags)
 163 {
 164     const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 165
 166 #if HAVE_WINSOCK2_H
 167     int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
 168                                   char *host, DWORD hostlen,
 169                                   char *serv, DWORD servlen, int flags);
 170     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
 171     win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
 172     if (win_getnameinfo)
 173         return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
 174 #endif
 175
 176     if (sa->sa_family != AF_INET)
 177         return EAI_FAMILY;
 178     if (!host && !serv)
 179         return EAI_NONAME;
 180
 181     if (host && hostlen > 0) {
 182         struct hostent *ent = NULL;
 183         uint32_t a;
 184         if (!(flags & NI_NUMERICHOST))
 185             ent = gethostbyaddr((const char *)&sin->sin_addr,
 186                                 sizeof(sin->sin_addr), AF_INET);
 187
 188         if (ent) {
 189             snprintf(host, hostlen, "%s", ent->h_name);
 190         } else if (flags & NI_NAMERQD) {
 191             return EAI_NONAME;
 192         } else {
 193             a = ntohl(sin->sin_addr.s_addr);
 194             snprintf(host, hostlen, "%d.%d.%d.%d",
 195                      ((a >> 24) & 0xff), ((a >> 16) & 0xff),
 196                      ((a >>  8) & 0xff), ( a        & 0xff));
 197         }
 198     }
 199
 200     if (serv && servlen > 0) {
 201         struct servent *ent = NULL;
 202         if (!(flags & NI_NUMERICSERV))
 203             ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
 204
 205         if (ent) {
 206             snprintf(serv, servlen, "%s", ent->s_name);
 207         } else
 208             snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
 209     }
 210
 211     return 0;
 212 }
 213
 214 const char *ff_gai_strerror(int ecode)
 215 {
 216     switch(ecode) {
 217     case EAI_FAIL   : return "A non-recoverable error occurred";
 218     case EAI_FAMILY : return "The address family was not recognized or the address length was invalid for the specified family";
 219     case EAI_NONAME : return "The name does not resolve for the supplied parameters";
 220     }
 221
 222     return "Unknown error";
 223 }
 224 #endif
 225
 226 int ff_socket_nonblock(int socket, int enable)
 227 {
 228 #if HAVE_WINSOCK2_H
 229    return ioctlsocket(socket, FIONBIO, &enable);
 230 #else
 231    if (enable)
 232       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
 233    else
 234       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
 235 #endif
 236 }
 237 #endif /* CONFIG_NETWORK */
 238
 239 #if CONFIG_FFSERVER
 240 #if !HAVE_POLL_H
 241 int poll(struct pollfd *fds, nfds_t numfds, int timeout)
 242 {
 243     fd_set read_set;
 244     fd_set write_set;
 245     fd_set exception_set;
 246     nfds_t i;
 247     int n;
 248     int rc;
 249
 250 #if HAVE_WINSOCK2_H
 251     if (numfds >= FD_SETSIZE) {
 252         errno = EINVAL;
 253         return -1;
 254     }
 255 #endif
 256
 257     FD_ZERO(&read_set);
 258     FD_ZERO(&write_set);
 259     FD_ZERO(&exception_set);
 260
 261     n = -1;
 262     for(i = 0; i < numfds; i++) {
 263         if (fds[i].fd < 0)
 264             continue;
 265 #if !HAVE_WINSOCK2_H
 266         if (fds[i].fd >= FD_SETSIZE) {
 267             errno = EINVAL;
 268             return -1;
 269         }
 270 #endif
 271
 272         if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
 273         if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
 274         if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
 275
 276         if (fds[i].fd > n)
 277             n = fds[i].fd;
 278     };
 279
 280     if (n == -1)
 281         /* Hey!? Nothing to poll, in fact!!! */
 282         return 0;
 283
 284     if (timeout < 0)
 285         rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
 286     else {
 287         struct timeval    tv;
 288
 289         tv.tv_sec = timeout / 1000;
 290         tv.tv_usec = 1000 * (timeout % 1000);
 291         rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
 292     };
 293
 294     if (rc < 0)
 295         return rc;
 296
 297     for(i = 0; i < (nfds_t) n; i++) {
 298         fds[i].revents = 0;
 299
 300         if (FD_ISSET(fds[i].fd, &read_set))      fds[i].revents |= POLLIN;
 301         if (FD_ISSET(fds[i].fd, &write_set))     fds[i].revents |= POLLOUT;
 302         if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
 303     };
 304
 305     return rc;
 306 }
 307 #endif /* HAVE_POLL_H */
 308 #endif /* CONFIG_FFSERVER */
 309