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2ba45a60 DM |
1 | /* |
2 | * TCP protocol | |
3 | * Copyright (c) 2002 Fabrice Bellard | |
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 | #include "avformat.h" | |
22 | #include "libavutil/parseutils.h" | |
23 | #include "libavutil/opt.h" | |
24 | #include "libavutil/time.h" | |
f6fa7814 | 25 | |
2ba45a60 DM |
26 | #include "internal.h" |
27 | #include "network.h" | |
28 | #include "os_support.h" | |
29 | #include "url.h" | |
30 | #if HAVE_POLL_H | |
31 | #include <poll.h> | |
32 | #endif | |
33 | ||
34 | typedef struct TCPContext { | |
35 | const AVClass *class; | |
36 | int fd; | |
37 | int listen; | |
38 | int open_timeout; | |
39 | int rw_timeout; | |
40 | int listen_timeout; | |
41 | } TCPContext; | |
42 | ||
43 | #define OFFSET(x) offsetof(TCPContext, x) | |
44 | #define D AV_OPT_FLAG_DECODING_PARAM | |
45 | #define E AV_OPT_FLAG_ENCODING_PARAM | |
46 | static const AVOption options[] = { | |
f6fa7814 DM |
47 | { "listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E }, |
48 | { "timeout", "set timeout (in microseconds) of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, | |
49 | { "listen_timeout", "Connection awaiting timeout", OFFSET(listen_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, | |
50 | { NULL } | |
2ba45a60 DM |
51 | }; |
52 | ||
f6fa7814 | 53 | static const AVClass tcp_class = { |
2ba45a60 DM |
54 | .class_name = "tcp", |
55 | .item_name = av_default_item_name, | |
56 | .option = options, | |
57 | .version = LIBAVUTIL_VERSION_INT, | |
58 | }; | |
59 | ||
60 | /* return non zero if error */ | |
61 | static int tcp_open(URLContext *h, const char *uri, int flags) | |
62 | { | |
63 | struct addrinfo hints = { 0 }, *ai, *cur_ai; | |
64 | int port, fd = -1; | |
65 | TCPContext *s = h->priv_data; | |
66 | const char *p; | |
67 | char buf[256]; | |
68 | int ret; | |
69 | char hostname[1024],proto[1024],path[1024]; | |
70 | char portstr[10]; | |
71 | s->open_timeout = 5000000; | |
72 | ||
73 | av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), | |
74 | &port, path, sizeof(path), uri); | |
75 | if (strcmp(proto, "tcp")) | |
76 | return AVERROR(EINVAL); | |
77 | if (port <= 0 || port >= 65536) { | |
78 | av_log(h, AV_LOG_ERROR, "Port missing in uri\n"); | |
79 | return AVERROR(EINVAL); | |
80 | } | |
81 | p = strchr(uri, '?'); | |
82 | if (p) { | |
83 | if (av_find_info_tag(buf, sizeof(buf), "listen", p)) { | |
84 | char *endptr = NULL; | |
85 | s->listen = strtol(buf, &endptr, 10); | |
86 | /* assume if no digits were found it is a request to enable it */ | |
87 | if (buf == endptr) | |
88 | s->listen = 1; | |
89 | } | |
90 | if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) { | |
91 | s->rw_timeout = strtol(buf, NULL, 10); | |
92 | } | |
93 | if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) { | |
94 | s->listen_timeout = strtol(buf, NULL, 10); | |
95 | } | |
96 | } | |
97 | if (s->rw_timeout >= 0) { | |
98 | s->open_timeout = | |
99 | h->rw_timeout = s->rw_timeout; | |
100 | } | |
101 | hints.ai_family = AF_UNSPEC; | |
102 | hints.ai_socktype = SOCK_STREAM; | |
103 | snprintf(portstr, sizeof(portstr), "%d", port); | |
104 | if (s->listen) | |
105 | hints.ai_flags |= AI_PASSIVE; | |
106 | if (!hostname[0]) | |
107 | ret = getaddrinfo(NULL, portstr, &hints, &ai); | |
108 | else | |
109 | ret = getaddrinfo(hostname, portstr, &hints, &ai); | |
110 | if (ret) { | |
111 | av_log(h, AV_LOG_ERROR, | |
112 | "Failed to resolve hostname %s: %s\n", | |
113 | hostname, gai_strerror(ret)); | |
114 | return AVERROR(EIO); | |
115 | } | |
116 | ||
117 | cur_ai = ai; | |
118 | ||
119 | restart: | |
120 | fd = ff_socket(cur_ai->ai_family, | |
121 | cur_ai->ai_socktype, | |
122 | cur_ai->ai_protocol); | |
123 | if (fd < 0) { | |
124 | ret = ff_neterrno(); | |
125 | goto fail; | |
126 | } | |
127 | ||
128 | if (s->listen) { | |
129 | if ((fd = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, | |
130 | s->listen_timeout, h)) < 0) { | |
131 | ret = fd; | |
132 | goto fail1; | |
133 | } | |
134 | } else { | |
135 | if ((ret = ff_listen_connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, | |
136 | s->open_timeout / 1000, h, !!cur_ai->ai_next)) < 0) { | |
137 | ||
138 | if (ret == AVERROR_EXIT) | |
139 | goto fail1; | |
140 | else | |
141 | goto fail; | |
142 | } | |
143 | } | |
144 | ||
145 | h->is_streamed = 1; | |
146 | s->fd = fd; | |
147 | freeaddrinfo(ai); | |
148 | return 0; | |
149 | ||
150 | fail: | |
151 | if (cur_ai->ai_next) { | |
152 | /* Retry with the next sockaddr */ | |
153 | cur_ai = cur_ai->ai_next; | |
154 | if (fd >= 0) | |
155 | closesocket(fd); | |
156 | ret = 0; | |
157 | goto restart; | |
158 | } | |
159 | fail1: | |
160 | if (fd >= 0) | |
161 | closesocket(fd); | |
162 | freeaddrinfo(ai); | |
163 | return ret; | |
164 | } | |
165 | ||
166 | static int tcp_read(URLContext *h, uint8_t *buf, int size) | |
167 | { | |
168 | TCPContext *s = h->priv_data; | |
169 | int ret; | |
170 | ||
171 | if (!(h->flags & AVIO_FLAG_NONBLOCK)) { | |
172 | ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback); | |
173 | if (ret) | |
174 | return ret; | |
175 | } | |
176 | ret = recv(s->fd, buf, size, 0); | |
177 | return ret < 0 ? ff_neterrno() : ret; | |
178 | } | |
179 | ||
180 | static int tcp_write(URLContext *h, const uint8_t *buf, int size) | |
181 | { | |
182 | TCPContext *s = h->priv_data; | |
183 | int ret; | |
184 | ||
185 | if (!(h->flags & AVIO_FLAG_NONBLOCK)) { | |
186 | ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback); | |
187 | if (ret) | |
188 | return ret; | |
189 | } | |
190 | ret = send(s->fd, buf, size, MSG_NOSIGNAL); | |
191 | return ret < 0 ? ff_neterrno() : ret; | |
192 | } | |
193 | ||
194 | static int tcp_shutdown(URLContext *h, int flags) | |
195 | { | |
196 | TCPContext *s = h->priv_data; | |
197 | int how; | |
198 | ||
199 | if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { | |
200 | how = SHUT_RDWR; | |
201 | } else if (flags & AVIO_FLAG_WRITE) { | |
202 | how = SHUT_WR; | |
203 | } else { | |
204 | how = SHUT_RD; | |
205 | } | |
206 | ||
207 | return shutdown(s->fd, how); | |
208 | } | |
209 | ||
210 | static int tcp_close(URLContext *h) | |
211 | { | |
212 | TCPContext *s = h->priv_data; | |
213 | closesocket(s->fd); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int tcp_get_file_handle(URLContext *h) | |
218 | { | |
219 | TCPContext *s = h->priv_data; | |
220 | return s->fd; | |
221 | } | |
222 | ||
223 | URLProtocol ff_tcp_protocol = { | |
224 | .name = "tcp", | |
225 | .url_open = tcp_open, | |
226 | .url_read = tcp_read, | |
227 | .url_write = tcp_write, | |
228 | .url_close = tcp_close, | |
229 | .url_get_file_handle = tcp_get_file_handle, | |
230 | .url_shutdown = tcp_shutdown, | |
231 | .priv_data_size = sizeof(TCPContext), | |
2ba45a60 | 232 | .flags = URL_PROTOCOL_FLAG_NETWORK, |
f6fa7814 | 233 | .priv_data_class = &tcp_class, |
2ba45a60 | 234 | }; |