1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* TCP protocol
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "libavutil/parseutils.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#if HAVE_POLL_H
#include <poll.h>
#endif
typedef struct TCPContext {
int fd;
} TCPContext;
/* return non zero if error */
static int tcp_open(URLContext *h, const char *uri, int flags)
{
struct addrinfo hints = { 0 }, *ai, *cur_ai;
int port, fd = -1;
TCPContext *s = h->priv_data;
int listen_socket = 0;
const char *p;
char buf[256];
int ret;
socklen_t optlen;
int timeout = 100;
char hostname[1024],proto[1024],path[1024];
char portstr[10];
av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
&port, path, sizeof(path), uri);
if (strcmp(proto,"tcp") || port <= 0 || port >= 65536)
return AVERROR(EINVAL);
p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "listen", p))
listen_socket = 1;
if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
timeout = strtol(buf, NULL, 10);
}
}
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
snprintf(portstr, sizeof(portstr), "%d", port);
if (listen_socket)
hints.ai_flags |= AI_PASSIVE;
ret = getaddrinfo(hostname, portstr, &hints, &ai);
if (ret) {
av_log(h, AV_LOG_ERROR,
"Failed to resolve hostname %s: %s\n",
hostname, gai_strerror(ret));
return AVERROR(EIO);
}
cur_ai = ai;
restart:
ret = AVERROR(EIO);
fd = socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol);
if (fd < 0)
goto fail;
if (listen_socket) {
int fd1;
int reuse = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
ret = bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
if (ret) {
ret = ff_neterrno();
goto fail1;
}
ret = listen(fd, 1);
if (ret) {
ret = ff_neterrno();
goto fail1;
}
fd1 = accept(fd, NULL, NULL);
if (fd1 < 0) {
ret = ff_neterrno();
goto fail1;
}
closesocket(fd);
fd = fd1;
ff_socket_nonblock(fd, 1);
} else {
redo:
ff_socket_nonblock(fd, 1);
ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
}
if (ret < 0) {
struct pollfd p = {fd, POLLOUT, 0};
ret = ff_neterrno();
if (ret == AVERROR(EINTR)) {
if (ff_check_interrupt(&h->interrupt_callback)) {
ret = AVERROR_EXIT;
goto fail1;
}
goto redo;
}
if (ret != AVERROR(EINPROGRESS) &&
ret != AVERROR(EAGAIN))
goto fail;
/* wait until we are connected or until abort */
while(timeout--) {
if (ff_check_interrupt(&h->interrupt_callback)) {
ret = AVERROR_EXIT;
goto fail1;
}
ret = poll(&p, 1, 100);
if (ret > 0)
break;
}
if (ret <= 0) {
ret = AVERROR(ETIMEDOUT);
goto fail;
}
/* test error */
optlen = sizeof(ret);
if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen))
ret = AVUNERROR(ff_neterrno());
if (ret != 0) {
char errbuf[100];
ret = AVERROR(ret);
av_strerror(ret, errbuf, sizeof(errbuf));
av_log(h, AV_LOG_ERROR,
"TCP connection to %s:%d failed: %s\n",
hostname, port, errbuf);
goto fail;
}
}
h->is_streamed = 1;
s->fd = fd;
freeaddrinfo(ai);
return 0;
fail:
if (cur_ai->ai_next) {
/* Retry with the next sockaddr */
cur_ai = cur_ai->ai_next;
if (fd >= 0)
closesocket(fd);
goto restart;
}
fail1:
if (fd >= 0)
closesocket(fd);
freeaddrinfo(ai);
return ret;
}
static int tcp_read(URLContext *h, uint8_t *buf, int size)
{
TCPContext *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 tcp_write(URLContext *h, const uint8_t *buf, int size)
{
TCPContext *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 tcp_shutdown(URLContext *h, int flags)
{
TCPContext *s = h->priv_data;
int how;
if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
how = SHUT_RDWR;
} else if (flags & AVIO_FLAG_WRITE) {
how = SHUT_WR;
} else {
how = SHUT_RD;
}
return shutdown(s->fd, how);
}
static int tcp_close(URLContext *h)
{
TCPContext *s = h->priv_data;
closesocket(s->fd);
return 0;
}
static int tcp_get_file_handle(URLContext *h)
{
TCPContext *s = h->priv_data;
return s->fd;
}
URLProtocol ff_tcp_protocol = {
.name = "tcp",
.url_open = tcp_open,
.url_read = tcp_read,
.url_write = tcp_write,
.url_close = tcp_close,
.url_get_file_handle = tcp_get_file_handle,
.url_shutdown = tcp_shutdown,
.priv_data_size = sizeof(TCPContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
|
