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  1. /*
  2.  * Unix socket protocol
  3.  * Copyright (c) 2013 Luca Barbato
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  *
  25.  * Unix socket url_protocol
  26.  *
  27.  */
  28.  
  29. #include "libavutil/avstring.h"
  30. #include "libavutil/opt.h"
  31. #include "os_support.h"
  32. #include "network.h"
  33. #include <sys/un.h>
  34. #include "url.h"
  35.  
  36. typedef struct UnixContext {
  37.     const AVClass *class;
  38.     struct sockaddr_un addr;
  39.     int timeout;
  40.     int listen;
  41.     int type;
  42.     int fd;
  43. } UnixContext;
  44.  
  45. #define OFFSET(x) offsetof(UnixContext, x)
  46. #define ED AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_ENCODING_PARAM
  47. static const AVOption unix_options[] = {
  48.     { "listen",    "Open socket for listening",             OFFSET(listen),  AV_OPT_TYPE_INT,   { .i64 = 0 },                    0,       1, ED },
  49.     { "timeout",   "Timeout in ms",                         OFFSET(timeout), AV_OPT_TYPE_INT,   { .i64 = -1 },                  -1, INT_MAX, ED },
  50.     { "type",      "Socket type",                           OFFSET(type),    AV_OPT_TYPE_INT,   { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
  51.     { "stream",    "Stream (reliable stream-oriented)",     0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
  52.     { "datagram",  "Datagram (unreliable packet-oriented)", 0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_DGRAM },     INT_MIN, INT_MAX, ED, "type" },
  53.     { "seqpacket", "Seqpacket (reliable packet-oriented",   0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_SEQPACKET }, INT_MIN, INT_MAX, ED, "type" },
  54.     { NULL }
  55. };
  56.  
  57. static const AVClass unix_class = {
  58.     .class_name = "unix",
  59.     .item_name  = av_default_item_name,
  60.     .option     = unix_options,
  61.     .version    = LIBAVUTIL_VERSION_INT,
  62. };
  63.  
  64. static int unix_open(URLContext *h, const char *filename, int flags)
  65. {
  66.     UnixContext *s = h->priv_data;
  67.     int fd, ret;
  68.  
  69.     av_strstart(filename, "unix:", &filename);
  70.     s->addr.sun_family = AF_UNIX;
  71.     av_strlcpy(s->addr.sun_path, filename, sizeof(s->addr.sun_path));
  72.  
  73.     if ((fd = ff_socket(AF_UNIX, s->type, 0)) < 0)
  74.         return ff_neterrno();
  75.  
  76.     if (s->listen) {
  77.         ret = ff_listen_bind(fd, (struct sockaddr *)&s->addr,
  78.                              sizeof(s->addr), s->timeout, h);
  79.         if (ret < 0)
  80.             goto fail;
  81.         fd = ret;
  82.     } else {
  83.         ret = ff_listen_connect(fd, (struct sockaddr *)&s->addr,
  84.                                 sizeof(s->addr), s->timeout, h, 0);
  85.         if (ret < 0)
  86.             goto fail;
  87.     }
  88.  
  89.     s->fd = fd;
  90.  
  91.     return 0;
  92.  
  93. fail:
  94.     if (s->listen && AVUNERROR(ret) != EADDRINUSE)
  95.         unlink(s->addr.sun_path);
  96.     if (fd >= 0)
  97.         closesocket(fd);
  98.     return ret;
  99. }
  100.  
  101. static int unix_read(URLContext *h, uint8_t *buf, int size)
  102. {
  103.     UnixContext *s = h->priv_data;
  104.     int ret;
  105.  
  106.     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
  107.         ret = ff_network_wait_fd(s->fd, 0);
  108.         if (ret < 0)
  109.             return ret;
  110.     }
  111.     ret = recv(s->fd, buf, size, 0);
  112.     return ret < 0 ? ff_neterrno() : ret;
  113. }
  114.  
  115. static int unix_write(URLContext *h, const uint8_t *buf, int size)
  116. {
  117.     UnixContext *s = h->priv_data;
  118.     int ret;
  119.  
  120.     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
  121.         ret = ff_network_wait_fd(s->fd, 1);
  122.         if (ret < 0)
  123.             return ret;
  124.     }
  125.     ret = send(s->fd, buf, size, MSG_NOSIGNAL);
  126.     return ret < 0 ? ff_neterrno() : ret;
  127. }
  128.  
  129. static int unix_close(URLContext *h)
  130. {
  131.     UnixContext *s = h->priv_data;
  132.     if (s->listen)
  133.         unlink(s->addr.sun_path);
  134.     closesocket(s->fd);
  135.     return 0;
  136. }
  137.  
  138. static int unix_get_file_handle(URLContext *h)
  139. {
  140.     UnixContext *s = h->priv_data;
  141.     return s->fd;
  142. }
  143.  
  144. URLProtocol ff_unix_protocol = {
  145.     .name                = "unix",
  146.     .url_open            = unix_open,
  147.     .url_read            = unix_read,
  148.     .url_write           = unix_write,
  149.     .url_close           = unix_close,
  150.     .url_get_file_handle = unix_get_file_handle,
  151.     .priv_data_size      = sizeof(UnixContext),
  152.     .priv_data_class     = &unix_class,
  153.     .flags               = URL_PROTOCOL_FLAG_NETWORK,
  154. };
  155.