327 lines
10 KiB
C
Executable File
327 lines
10 KiB
C
Executable File
/*
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* TCP protocol
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "libavutil/avassert.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include "internal.h"
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#include "network.h"
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#include "os_support.h"
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#include "url.h"
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#if HAVE_POLL_H
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#include <poll.h>
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#endif
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typedef struct TCPContext {
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const AVClass *class;
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int fd;
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int listen;
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int open_timeout;
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int rw_timeout;
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int listen_timeout;
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int recv_buffer_size;
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int send_buffer_size;
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int tcp_nodelay;
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#if !HAVE_WINSOCK2_H
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int tcp_mss;
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#endif /* !HAVE_WINSOCK2_H */
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} TCPContext;
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#define OFFSET(x) offsetof(TCPContext, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, .flags = D|E },
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{ "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 },
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{ "listen_timeout", "Connection awaiting timeout (in milliseconds)", OFFSET(listen_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
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{ "send_buffer_size", "Socket send buffer size (in bytes)", OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
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{ "recv_buffer_size", "Socket receive buffer size (in bytes)", OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
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{ "tcp_nodelay", "Use TCP_NODELAY to disable nagle's algorithm", OFFSET(tcp_nodelay), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = D|E },
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#if !HAVE_WINSOCK2_H
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{ "tcp_mss", "Maximum segment size for outgoing TCP packets", OFFSET(tcp_mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
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#endif /* !HAVE_WINSOCK2_H */
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{ NULL }
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};
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static const AVClass tcp_class = {
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.class_name = "tcp",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static void customize_fd(void *ctx, int fd)
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{
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TCPContext *s = ctx;
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/* Set the socket's send or receive buffer sizes, if specified.
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If unspecified or setting fails, system default is used. */
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if (s->recv_buffer_size > 0) {
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if (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size))) {
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ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_RCVBUF)");
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}
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}
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if (s->send_buffer_size > 0) {
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if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size))) {
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ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_SNDBUF)");
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}
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}
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if (s->tcp_nodelay > 0) {
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if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &s->tcp_nodelay, sizeof (s->tcp_nodelay))) {
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ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_NODELAY)");
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}
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}
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#if !HAVE_WINSOCK2_H
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if (s->tcp_mss > 0) {
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if (setsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &s->tcp_mss, sizeof (s->tcp_mss))) {
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ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_MAXSEG)");
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}
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}
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#endif /* !HAVE_WINSOCK2_H */
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}
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/* return non zero if error */
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static int tcp_open(URLContext *h, const char *uri, int flags)
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{
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struct addrinfo hints = { 0 }, *ai, *cur_ai;
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int port, fd = -1;
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TCPContext *s = h->priv_data;
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const char *p;
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char buf[256];
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int ret;
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char hostname[1024],proto[1024],path[1024];
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char portstr[10];
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s->open_timeout = 5000000;
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av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
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&port, path, sizeof(path), uri);
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if (strcmp(proto, "tcp"))
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return AVERROR(EINVAL);
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if (port <= 0 || port >= 65536) {
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av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
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return AVERROR(EINVAL);
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}
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p = strchr(uri, '?');
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if (p) {
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if (av_find_info_tag(buf, sizeof(buf), "listen", p)) {
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char *endptr = NULL;
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s->listen = strtol(buf, &endptr, 10);
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/* assume if no digits were found it is a request to enable it */
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if (buf == endptr)
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s->listen = 1;
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}
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if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
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s->rw_timeout = strtol(buf, NULL, 10);
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}
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if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
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s->listen_timeout = strtol(buf, NULL, 10);
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}
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}
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if (s->rw_timeout >= 0) {
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s->open_timeout =
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h->rw_timeout = s->rw_timeout;
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}
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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snprintf(portstr, sizeof(portstr), "%d", port);
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if (s->listen)
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hints.ai_flags |= AI_PASSIVE;
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if (!hostname[0])
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ret = getaddrinfo(NULL, portstr, &hints, &ai);
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else
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ret = getaddrinfo(hostname, portstr, &hints, &ai);
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if (ret) {
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av_log(h, AV_LOG_ERROR,
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"Failed to resolve hostname %s: %s\n",
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hostname, gai_strerror(ret));
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return AVERROR(EIO);
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}
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cur_ai = ai;
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#if HAVE_STRUCT_SOCKADDR_IN6
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// workaround for IOS9 getaddrinfo in IPv6 only network use hardcode IPv4 address can not resolve port number.
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if (cur_ai->ai_family == AF_INET6){
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struct sockaddr_in6 * sockaddr_v6 = (struct sockaddr_in6 *)cur_ai->ai_addr;
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if (!sockaddr_v6->sin6_port){
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sockaddr_v6->sin6_port = htons(port);
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}
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}
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#endif
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if (s->listen > 0) {
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while (cur_ai && fd < 0) {
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fd = ff_socket(cur_ai->ai_family,
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cur_ai->ai_socktype,
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cur_ai->ai_protocol);
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if (fd < 0) {
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ret = ff_neterrno();
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cur_ai = cur_ai->ai_next;
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}
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}
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if (fd < 0)
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goto fail1;
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customize_fd(s, fd);
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}
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if (s->listen == 2) {
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// multi-client
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if ((ret = ff_listen(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) < 0)
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goto fail1;
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} else if (s->listen == 1) {
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// single client
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if ((ret = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen,
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s->listen_timeout, h)) < 0)
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goto fail1;
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// Socket descriptor already closed here. Safe to overwrite to client one.
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fd = ret;
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} else {
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ret = ff_connect_parallel(ai, s->open_timeout / 1000, 3, h, &fd, customize_fd, s);
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if (ret < 0)
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goto fail1;
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}
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h->is_streamed = 1;
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s->fd = fd;
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freeaddrinfo(ai);
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return 0;
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fail1:
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if (fd >= 0)
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closesocket(fd);
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freeaddrinfo(ai);
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return ret;
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}
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static int tcp_accept(URLContext *s, URLContext **c)
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{
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TCPContext *sc = s->priv_data;
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TCPContext *cc;
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int ret;
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av_assert0(sc->listen);
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if ((ret = ffurl_alloc(c, s->filename, s->flags, &s->interrupt_callback)) < 0)
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return ret;
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cc = (*c)->priv_data;
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ret = ff_accept(sc->fd, sc->listen_timeout, s);
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if (ret < 0) {
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ffurl_closep(c);
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return ret;
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}
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cc->fd = ret;
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return 0;
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}
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static int tcp_read(URLContext *h, uint8_t *buf, int size)
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{
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TCPContext *s = h->priv_data;
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int ret;
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if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
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ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback);
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if (ret)
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return ret;
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}
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ret = recv(s->fd, buf, size, 0);
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if (ret == 0)
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return AVERROR_EOF;
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return ret < 0 ? ff_neterrno() : ret;
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}
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static int tcp_write(URLContext *h, const uint8_t *buf, int size)
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{
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TCPContext *s = h->priv_data;
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int ret;
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if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
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ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback);
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if (ret)
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return ret;
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}
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ret = send(s->fd, buf, size, MSG_NOSIGNAL);
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return ret < 0 ? ff_neterrno() : ret;
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}
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static int tcp_shutdown(URLContext *h, int flags)
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{
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TCPContext *s = h->priv_data;
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int how;
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if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
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how = SHUT_RDWR;
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} else if (flags & AVIO_FLAG_WRITE) {
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how = SHUT_WR;
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} else {
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how = SHUT_RD;
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}
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return shutdown(s->fd, how);
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}
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static int tcp_close(URLContext *h)
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{
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TCPContext *s = h->priv_data;
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closesocket(s->fd);
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return 0;
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}
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static int tcp_get_file_handle(URLContext *h)
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{
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TCPContext *s = h->priv_data;
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return s->fd;
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}
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static int tcp_get_window_size(URLContext *h)
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{
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TCPContext *s = h->priv_data;
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int avail;
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socklen_t avail_len = sizeof(avail);
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#if HAVE_WINSOCK2_H
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/* SO_RCVBUF with winsock only reports the actual TCP window size when
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auto-tuning has been disabled via setting SO_RCVBUF */
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if (s->recv_buffer_size < 0) {
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return AVERROR(ENOSYS);
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}
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#endif
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if (getsockopt(s->fd, SOL_SOCKET, SO_RCVBUF, &avail, &avail_len)) {
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return ff_neterrno();
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}
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return avail;
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}
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const URLProtocol ff_tcp_protocol = {
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.name = "tcp",
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.url_open = tcp_open,
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.url_accept = tcp_accept,
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.url_read = tcp_read,
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.url_write = tcp_write,
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.url_close = tcp_close,
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.url_get_file_handle = tcp_get_file_handle,
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.url_get_short_seek = tcp_get_window_size,
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.url_shutdown = tcp_shutdown,
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.priv_data_size = sizeof(TCPContext),
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.flags = URL_PROTOCOL_FLAG_NETWORK,
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.priv_data_class = &tcp_class,
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};
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