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
36typedef 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
47static 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
57static 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
64static 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        fd = ff_listen_bind(fd, (struct sockaddr *)&s->addr,
78                            sizeof(s->addr), s->timeout, h);
79        if (fd < 0) {
80            ret = fd;
81            goto fail;
82        }
83    } else {
84        ret = ff_listen_connect(fd, (struct sockaddr *)&s->addr,
85                                sizeof(s->addr), s->timeout, h, 0);
86        if (ret < 0)
87            goto fail;
88    }
89
90    s->fd = fd;
91
92    return 0;
93
94fail:
95    if (s->listen && AVUNERROR(ret) != EADDRINUSE)
96        unlink(s->addr.sun_path);
97    if (fd >= 0)
98        closesocket(fd);
99    return ret;
100}
101
102static int unix_read(URLContext *h, uint8_t *buf, int size)
103{
104    UnixContext *s = h->priv_data;
105    int ret;
106
107    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
108        ret = ff_network_wait_fd(s->fd, 0);
109        if (ret < 0)
110            return ret;
111    }
112    ret = recv(s->fd, buf, size, 0);
113    return ret < 0 ? ff_neterrno() : ret;
114}
115
116static int unix_write(URLContext *h, const uint8_t *buf, int size)
117{
118    UnixContext *s = h->priv_data;
119    int ret;
120
121    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
122        ret = ff_network_wait_fd(s->fd, 1);
123        if (ret < 0)
124            return ret;
125    }
126    ret = send(s->fd, buf, size, 0);
127    return ret < 0 ? ff_neterrno() : ret;
128}
129
130static int unix_close(URLContext *h)
131{
132    UnixContext *s = h->priv_data;
133    if (s->listen)
134        unlink(s->addr.sun_path);
135    closesocket(s->fd);
136    return 0;
137}
138
139static int unix_get_file_handle(URLContext *h)
140{
141    UnixContext *s = h->priv_data;
142    return s->fd;
143}
144
145URLProtocol ff_unix_protocol = {
146    .name                = "unix",
147    .url_open            = unix_open,
148    .url_read            = unix_read,
149    .url_write           = unix_write,
150    .url_close           = unix_close,
151    .url_get_file_handle = unix_get_file_handle,
152    .priv_data_size      = sizeof(UnixContext),
153    .priv_data_class     = &unix_class,
154    .flags               = URL_PROTOCOL_FLAG_NETWORK,
155};
156