| /* |
| * TCP protocol |
| * Copyright (c) 2002 Fabrice Bellard |
| * |
| * 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 |
| */ |
| #include "avformat.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/parseutils.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/time.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 { |
| const AVClass *class; |
| int fd; |
| int listen; |
| int open_timeout; |
| int rw_timeout; |
| int listen_timeout; |
| int recv_buffer_size; |
| int send_buffer_size; |
| int tcp_nodelay; |
| #if !HAVE_WINSOCK2_H |
| int tcp_mss; |
| #endif /* !HAVE_WINSOCK2_H */ |
| } TCPContext; |
| |
| #define OFFSET(x) offsetof(TCPContext, x) |
| #define D AV_OPT_FLAG_DECODING_PARAM |
| #define E AV_OPT_FLAG_ENCODING_PARAM |
| static const AVOption options[] = { |
| { "listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, .flags = D|E }, |
| { "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 }, |
| { "listen_timeout", "Connection awaiting timeout (in milliseconds)", OFFSET(listen_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, |
| { "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 }, |
| { "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 }, |
| { "tcp_nodelay", "Use TCP_NODELAY to disable nagle's algorithm", OFFSET(tcp_nodelay), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = D|E }, |
| #if !HAVE_WINSOCK2_H |
| { "tcp_mss", "Maximum segment size for outgoing TCP packets", OFFSET(tcp_mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, |
| #endif /* !HAVE_WINSOCK2_H */ |
| { NULL } |
| }; |
| |
| static const AVClass tcp_class = { |
| .class_name = "tcp", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| static void customize_fd(void *ctx, int fd) |
| { |
| TCPContext *s = ctx; |
| /* Set the socket's send or receive buffer sizes, if specified. |
| If unspecified or setting fails, system default is used. */ |
| if (s->recv_buffer_size > 0) { |
| if (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size))) { |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_RCVBUF)"); |
| } |
| } |
| if (s->send_buffer_size > 0) { |
| if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size))) { |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_SNDBUF)"); |
| } |
| } |
| if (s->tcp_nodelay > 0) { |
| if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &s->tcp_nodelay, sizeof (s->tcp_nodelay))) { |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_NODELAY)"); |
| } |
| } |
| #if !HAVE_WINSOCK2_H |
| if (s->tcp_mss > 0) { |
| if (setsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &s->tcp_mss, sizeof (s->tcp_mss))) { |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_MAXSEG)"); |
| } |
| } |
| #endif /* !HAVE_WINSOCK2_H */ |
| } |
| |
| /* 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; |
| const char *p; |
| char buf[256]; |
| int ret; |
| char hostname[1024],proto[1024],path[1024]; |
| char portstr[10]; |
| s->open_timeout = 5000000; |
| |
| av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), |
| &port, path, sizeof(path), uri); |
| if (strcmp(proto, "tcp")) |
| return AVERROR(EINVAL); |
| if (port <= 0 || port >= 65536) { |
| av_log(h, AV_LOG_ERROR, "Port missing in uri\n"); |
| return AVERROR(EINVAL); |
| } |
| p = strchr(uri, '?'); |
| if (p) { |
| if (av_find_info_tag(buf, sizeof(buf), "listen", p)) { |
| char *endptr = NULL; |
| s->listen = strtol(buf, &endptr, 10); |
| /* assume if no digits were found it is a request to enable it */ |
| if (buf == endptr) |
| s->listen = 1; |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) { |
| s->rw_timeout = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) { |
| s->listen_timeout = strtol(buf, NULL, 10); |
| } |
| } |
| if (s->rw_timeout >= 0) { |
| s->open_timeout = |
| h->rw_timeout = s->rw_timeout; |
| } |
| hints.ai_family = AF_UNSPEC; |
| hints.ai_socktype = SOCK_STREAM; |
| snprintf(portstr, sizeof(portstr), "%d", port); |
| if (s->listen) |
| hints.ai_flags |= AI_PASSIVE; |
| if (!hostname[0]) |
| ret = getaddrinfo(NULL, portstr, &hints, &ai); |
| else |
| 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; |
| |
| #if HAVE_STRUCT_SOCKADDR_IN6 |
| // workaround for IOS9 getaddrinfo in IPv6 only network use hardcode IPv4 address can not resolve port number. |
| if (cur_ai->ai_family == AF_INET6){ |
| struct sockaddr_in6 * sockaddr_v6 = (struct sockaddr_in6 *)cur_ai->ai_addr; |
| if (!sockaddr_v6->sin6_port){ |
| sockaddr_v6->sin6_port = htons(port); |
| } |
| } |
| #endif |
| |
| if (s->listen > 0) { |
| while (cur_ai && fd < 0) { |
| fd = ff_socket(cur_ai->ai_family, |
| cur_ai->ai_socktype, |
| cur_ai->ai_protocol); |
| if (fd < 0) { |
| ret = ff_neterrno(); |
| cur_ai = cur_ai->ai_next; |
| } |
| } |
| if (fd < 0) |
| goto fail1; |
| customize_fd(s, fd); |
| } |
| |
| if (s->listen == 2) { |
| // multi-client |
| if ((ret = ff_listen(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) < 0) |
| goto fail1; |
| } else if (s->listen == 1) { |
| // single client |
| if ((ret = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, |
| s->listen_timeout, h)) < 0) |
| goto fail1; |
| // Socket descriptor already closed here. Safe to overwrite to client one. |
| fd = ret; |
| } else { |
| ret = ff_connect_parallel(ai, s->open_timeout / 1000, 3, h, &fd, customize_fd, s); |
| if (ret < 0) |
| goto fail1; |
| } |
| |
| h->is_streamed = 1; |
| s->fd = fd; |
| |
| freeaddrinfo(ai); |
| return 0; |
| |
| fail1: |
| if (fd >= 0) |
| closesocket(fd); |
| freeaddrinfo(ai); |
| return ret; |
| } |
| |
| static int tcp_accept(URLContext *s, URLContext **c) |
| { |
| TCPContext *sc = s->priv_data; |
| TCPContext *cc; |
| int ret; |
| av_assert0(sc->listen); |
| if ((ret = ffurl_alloc(c, s->filename, s->flags, &s->interrupt_callback)) < 0) |
| return ret; |
| cc = (*c)->priv_data; |
| ret = ff_accept(sc->fd, sc->listen_timeout, s); |
| if (ret < 0) { |
| ffurl_closep(c); |
| return ret; |
| } |
| cc->fd = ret; |
| return 0; |
| } |
| |
| 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_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback); |
| if (ret) |
| return ret; |
| } |
| ret = recv(s->fd, buf, size, 0); |
| if (ret == 0) |
| return AVERROR_EOF; |
| 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_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback); |
| if (ret) |
| return ret; |
| } |
| ret = send(s->fd, buf, size, MSG_NOSIGNAL); |
| 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; |
| } |
| |
| static int tcp_get_window_size(URLContext *h) |
| { |
| TCPContext *s = h->priv_data; |
| int avail; |
| socklen_t avail_len = sizeof(avail); |
| |
| #if HAVE_WINSOCK2_H |
| /* SO_RCVBUF with winsock only reports the actual TCP window size when |
| auto-tuning has been disabled via setting SO_RCVBUF */ |
| if (s->recv_buffer_size < 0) { |
| return AVERROR(ENOSYS); |
| } |
| #endif |
| |
| if (getsockopt(s->fd, SOL_SOCKET, SO_RCVBUF, &avail, &avail_len)) { |
| return ff_neterrno(); |
| } |
| return avail; |
| } |
| |
| const URLProtocol ff_tcp_protocol = { |
| .name = "tcp", |
| .url_open = tcp_open, |
| .url_accept = tcp_accept, |
| .url_read = tcp_read, |
| .url_write = tcp_write, |
| .url_close = tcp_close, |
| .url_get_file_handle = tcp_get_file_handle, |
| .url_get_short_seek = tcp_get_window_size, |
| .url_shutdown = tcp_shutdown, |
| .priv_data_size = sizeof(TCPContext), |
| .flags = URL_PROTOCOL_FLAG_NETWORK, |
| .priv_data_class = &tcp_class, |
| }; |
