yading@11: /*
yading@11:  * TCP protocol
yading@11:  * Copyright (c) 2002 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: #include "avformat.h"
yading@11: #include "libavutil/parseutils.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "libavutil/time.h"
yading@11: #include "internal.h"
yading@11: #include "network.h"
yading@11: #include "os_support.h"
yading@11: #include "url.h"
yading@11: #if HAVE_POLL_H
yading@11: #include <poll.h>
yading@11: #endif
yading@11: 
yading@11: typedef struct TCPContext {
yading@11:     const AVClass *class;
yading@11:     int fd;
yading@11:     int listen;
yading@11:     int rw_timeout;
yading@11:     int listen_timeout;
yading@11: } TCPContext;
yading@11: 
yading@11: #define OFFSET(x) offsetof(TCPContext, x)
yading@11: #define D AV_OPT_FLAG_DECODING_PARAM
yading@11: #define E AV_OPT_FLAG_ENCODING_PARAM
yading@11: static const AVOption options[] = {
yading@11: {"listen", "listen on port instead of connecting", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
yading@11: {"timeout", "timeout of socket i/o operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
yading@11: {"listen_timeout", "connection awaiting timeout", OFFSET(listen_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
yading@11: {NULL}
yading@11: };
yading@11: 
yading@11: static const AVClass tcp_context_class = {
yading@11:     .class_name = "tcp",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .option     = options,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11: };
yading@11: 
yading@11: /* return non zero if error */
yading@11: static int tcp_open(URLContext *h, const char *uri, int flags)
yading@11: {
yading@11:     struct addrinfo hints = { 0 }, *ai, *cur_ai;
yading@11:     int port, fd = -1;
yading@11:     TCPContext *s = h->priv_data;
yading@11:     const char *p;
yading@11:     char buf[256];
yading@11:     int ret;
yading@11:     socklen_t optlen;
yading@11:     char hostname[1024],proto[1024],path[1024];
yading@11:     char portstr[10];
yading@11:     h->rw_timeout = 5000000;
yading@11: 
yading@11:     av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname),
yading@11:         &port, path, sizeof(path), uri);
yading@11:     if (strcmp(proto, "tcp"))
yading@11:         return AVERROR(EINVAL);
yading@11:     if (port <= 0 || port >= 65536) {
yading@11:         av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11:     p = strchr(uri, '?');
yading@11:     if (p) {
yading@11:         if (av_find_info_tag(buf, sizeof(buf), "listen", p))
yading@11:             s->listen = 1;
yading@11:         if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) {
yading@11:             s->rw_timeout = strtol(buf, NULL, 10);
yading@11:         }
yading@11:         if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) {
yading@11:             s->listen_timeout = strtol(buf, NULL, 10);
yading@11:         }
yading@11:     }
yading@11:     h->rw_timeout = s->rw_timeout;
yading@11:     hints.ai_family = AF_UNSPEC;
yading@11:     hints.ai_socktype = SOCK_STREAM;
yading@11:     snprintf(portstr, sizeof(portstr), "%d", port);
yading@11:     if (s->listen)
yading@11:         hints.ai_flags |= AI_PASSIVE;
yading@11:     if (!hostname[0])
yading@11:         ret = getaddrinfo(NULL, portstr, &hints, &ai);
yading@11:     else
yading@11:         ret = getaddrinfo(hostname, portstr, &hints, &ai);
yading@11:     if (ret) {
yading@11:         av_log(h, AV_LOG_ERROR,
yading@11:                "Failed to resolve hostname %s: %s\n",
yading@11:                hostname, gai_strerror(ret));
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     cur_ai = ai;
yading@11: 
yading@11:  restart:
yading@11:     ret = AVERROR(EIO);
yading@11:     fd = socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol);
yading@11:     if (fd < 0)
yading@11:         goto fail;
yading@11: 
yading@11:     if (s->listen) {
yading@11:         int fd1;
yading@11:         int reuse = 1;
yading@11:         struct pollfd lp = { fd, POLLIN, 0 };
yading@11:         setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
yading@11:         ret = bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
yading@11:         if (ret) {
yading@11:             ret = ff_neterrno();
yading@11:             goto fail1;
yading@11:         }
yading@11:         ret = listen(fd, 1);
yading@11:         if (ret) {
yading@11:             ret = ff_neterrno();
yading@11:             goto fail1;
yading@11:         }
yading@11:         ret = poll(&lp, 1, s->listen_timeout >= 0 ? s->listen_timeout : -1);
yading@11:         if (ret <= 0) {
yading@11:             ret = AVERROR(ETIMEDOUT);
yading@11:             goto fail1;
yading@11:         }
yading@11:         fd1 = accept(fd, NULL, NULL);
yading@11:         if (fd1 < 0) {
yading@11:             ret = ff_neterrno();
yading@11:             goto fail1;
yading@11:         }
yading@11:         closesocket(fd);
yading@11:         fd = fd1;
yading@11:         ff_socket_nonblock(fd, 1);
yading@11:     } else {
yading@11:  redo:
yading@11:         ff_socket_nonblock(fd, 1);
yading@11:         ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
yading@11:     }
yading@11: 
yading@11:     if (ret < 0) {
yading@11:         struct pollfd p = {fd, POLLOUT, 0};
yading@11:         int64_t wait_started;
yading@11:         ret = ff_neterrno();
yading@11:         if (ret == AVERROR(EINTR)) {
yading@11:             if (ff_check_interrupt(&h->interrupt_callback)) {
yading@11:                 ret = AVERROR_EXIT;
yading@11:                 goto fail1;
yading@11:             }
yading@11:             goto redo;
yading@11:         }
yading@11:         if (ret != AVERROR(EINPROGRESS) &&
yading@11:             ret != AVERROR(EAGAIN))
yading@11:             goto fail;
yading@11: 
yading@11:         /* wait until we are connected or until abort */
yading@11:         wait_started = av_gettime();
yading@11:         do {
yading@11:             if (ff_check_interrupt(&h->interrupt_callback)) {
yading@11:                 ret = AVERROR_EXIT;
yading@11:                 goto fail1;
yading@11:             }
yading@11:             ret = poll(&p, 1, 100);
yading@11:             if (ret > 0)
yading@11:                 break;
yading@11:         } while (!h->rw_timeout || (av_gettime() - wait_started < h->rw_timeout));
yading@11:         if (ret <= 0) {
yading@11:             ret = AVERROR(ETIMEDOUT);
yading@11:             goto fail;
yading@11:         }
yading@11:         /* test error */
yading@11:         optlen = sizeof(ret);
yading@11:         if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen))
yading@11:             ret = AVUNERROR(ff_neterrno());
yading@11:         if (ret != 0) {
yading@11:             char errbuf[100];
yading@11:             ret = AVERROR(ret);
yading@11:             av_strerror(ret, errbuf, sizeof(errbuf));
yading@11:             av_log(h, AV_LOG_ERROR,
yading@11:                    "TCP connection to %s:%d failed: %s\n",
yading@11:                    hostname, port, errbuf);
yading@11:             goto fail;
yading@11:         }
yading@11:     }
yading@11:     h->is_streamed = 1;
yading@11:     s->fd = fd;
yading@11:     freeaddrinfo(ai);
yading@11:     return 0;
yading@11: 
yading@11:  fail:
yading@11:     if (cur_ai->ai_next) {
yading@11:         /* Retry with the next sockaddr */
yading@11:         cur_ai = cur_ai->ai_next;
yading@11:         if (fd >= 0)
yading@11:             closesocket(fd);
yading@11:         goto restart;
yading@11:     }
yading@11:  fail1:
yading@11:     if (fd >= 0)
yading@11:         closesocket(fd);
yading@11:     freeaddrinfo(ai);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int tcp_read(URLContext *h, uint8_t *buf, int size)
yading@11: {
yading@11:     TCPContext *s = h->priv_data;
yading@11:     int ret;
yading@11: 
yading@11:     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
yading@11:         ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback);
yading@11:         if (ret)
yading@11:             return ret;
yading@11:     }
yading@11:     ret = recv(s->fd, buf, size, 0);
yading@11:     return ret < 0 ? ff_neterrno() : ret;
yading@11: }
yading@11: 
yading@11: static int tcp_write(URLContext *h, const uint8_t *buf, int size)
yading@11: {
yading@11:     TCPContext *s = h->priv_data;
yading@11:     int ret;
yading@11: 
yading@11:     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
yading@11:         ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback);
yading@11:         if (ret)
yading@11:             return ret;
yading@11:     }
yading@11:     ret = send(s->fd, buf, size, 0);
yading@11:     return ret < 0 ? ff_neterrno() : ret;
yading@11: }
yading@11: 
yading@11: static int tcp_shutdown(URLContext *h, int flags)
yading@11: {
yading@11:     TCPContext *s = h->priv_data;
yading@11:     int how;
yading@11: 
yading@11:     if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
yading@11:         how = SHUT_RDWR;
yading@11:     } else if (flags & AVIO_FLAG_WRITE) {
yading@11:         how = SHUT_WR;
yading@11:     } else {
yading@11:         how = SHUT_RD;
yading@11:     }
yading@11: 
yading@11:     return shutdown(s->fd, how);
yading@11: }
yading@11: 
yading@11: static int tcp_close(URLContext *h)
yading@11: {
yading@11:     TCPContext *s = h->priv_data;
yading@11:     closesocket(s->fd);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int tcp_get_file_handle(URLContext *h)
yading@11: {
yading@11:     TCPContext *s = h->priv_data;
yading@11:     return s->fd;
yading@11: }
yading@11: 
yading@11: URLProtocol ff_tcp_protocol = {
yading@11:     .name                = "tcp",
yading@11:     .url_open            = tcp_open,
yading@11:     .url_read            = tcp_read,
yading@11:     .url_write           = tcp_write,
yading@11:     .url_close           = tcp_close,
yading@11:     .url_get_file_handle = tcp_get_file_handle,
yading@11:     .url_shutdown        = tcp_shutdown,
yading@11:     .priv_data_size      = sizeof(TCPContext),
yading@11:     .priv_data_class     = &tcp_context_class,
yading@11:     .flags               = URL_PROTOCOL_FLAG_NETWORK,
yading@11: };