/*
  * Unix socket protocol
  * Copyright (c) 2013 Luca Barbato
  *

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  *
  * Unix socket url_protocol
  *
  */
 
 #include "libavutil/avstring.h"
 #include "libavutil/opt.h"
 #include "os_support.h"
 #include "network.h"

 #include <sys/un.h>

 #include "url.h"
 
 typedef struct UnixContext {
     const AVClass *class;
     struct sockaddr_un addr;
     int timeout;
     int listen;
     int type;
     int fd;
 } UnixContext;
 
 #define OFFSET(x) offsetof(UnixContext, x)
 #define ED AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption unix_options[] = {
     { "listen",    "Open socket for listening",             OFFSET(listen),  AV_OPT_TYPE_INT,   { .i64 = 0 },                    0,       1, ED },
     { "timeout",   "Timeout in ms",                         OFFSET(timeout), AV_OPT_TYPE_INT,   { .i64 = -1 },                  -1, INT_MAX, ED },
     { "type",      "Socket type",                           OFFSET(type),    AV_OPT_TYPE_INT,   { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
     { "stream",    "Stream (reliable stream-oriented)",     0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
     { "datagram",  "Datagram (unreliable packet-oriented)", 0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_DGRAM },     INT_MIN, INT_MAX, ED, "type" },
     { "seqpacket", "Seqpacket (reliable packet-oriented",   0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_SEQPACKET }, INT_MIN, INT_MAX, ED, "type" },
     { NULL }
 };
 
 static const AVClass unix_class = {
     .class_name = "unix",
     .item_name  = av_default_item_name,
     .option     = unix_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 static int unix_open(URLContext *h, const char *filename, int flags)
 {
     UnixContext *s = h->priv_data;
     int fd, ret;
 
     av_strstart(filename, "unix:", &filename);
     s->addr.sun_family = AF_UNIX;
     av_strlcpy(s->addr.sun_path, filename, sizeof(s->addr.sun_path));
 

     if ((fd = ff_socket(AF_UNIX, s->type, 0)) < 0)

         return ff_neterrno();
 
     if (s->listen) {
         fd = ff_listen_bind(fd, (struct sockaddr *)&s->addr,
                             sizeof(s->addr), s->timeout, h);
         if (fd < 0) {
             ret = fd;
             goto fail;
         }
     } else {
         ret = ff_listen_connect(fd, (struct sockaddr *)&s->addr,

                                 sizeof(s->addr), s->timeout, h, 0);

         if (ret < 0)
             goto fail;
     }
 
     s->fd = fd;
 
     return 0;
 
 fail:

     if (s->listen && AVUNERROR(ret) != EADDRINUSE)

         unlink(s->addr.sun_path);
     if (fd >= 0)
         closesocket(fd);
     return ret;
 }
 
 static int unix_read(URLContext *h, uint8_t *buf, int size)
 {
     UnixContext *s = h->priv_data;
     int ret;
 
     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
         ret = ff_network_wait_fd(s->fd, 0);
         if (ret < 0)
             return ret;
     }
     ret = recv(s->fd, buf, size, 0);
     return ret < 0 ? ff_neterrno() : ret;
 }
 
 static int unix_write(URLContext *h, const uint8_t *buf, int size)
 {
     UnixContext *s = h->priv_data;
     int ret;
 
     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
         ret = ff_network_wait_fd(s->fd, 1);
         if (ret < 0)
             return ret;
     }
     ret = send(s->fd, buf, size, 0);
     return ret < 0 ? ff_neterrno() : ret;
 }
 
 static int unix_close(URLContext *h)
 {
     UnixContext *s = h->priv_data;
     if (s->listen)
         unlink(s->addr.sun_path);
     closesocket(s->fd);
     return 0;
 }
 
 static int unix_get_file_handle(URLContext *h)
 {
     UnixContext *s = h->priv_data;
     return s->fd;
 }
 
 URLProtocol ff_unix_protocol = {
     .name                = "unix",
     .url_open            = unix_open,
     .url_read            = unix_read,
     .url_write           = unix_write,
     .url_close           = unix_close,
     .url_get_file_handle = unix_get_file_handle,
     .priv_data_size      = sizeof(UnixContext),
     .priv_data_class     = &unix_class,
     .flags               = URL_PROTOCOL_FLAG_NETWORK,
 };