libavformat/os_support.c

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