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/*
* 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 <unistd.h>
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#if HAVE_POLL_H
#include <poll.h>
#endif
#include <sys/time.h>
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, *ai, *cur_ai;
int port, fd = -1;
TCPContext *s = NULL;
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);
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
snprintf(portstr, sizeof(portstr), "%d", port);
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;
ret = bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
listen(fd, 1);
fd1 = accept(fd, NULL, NULL);
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 (url_interrupt_cb()) {
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 (url_interrupt_cb()) {
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);
getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen);
if (ret != 0) {
av_log(h, AV_LOG_ERROR,
"TCP connection to %s:%d failed: %s\n",
hostname, port, strerror(ret));
ret = AVERROR(ret);
goto fail;
}
}
s = av_malloc(sizeof(TCPContext));
if (!s) {
freeaddrinfo(ai);
return AVERROR(ENOMEM);
}
h->priv_data = s;
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_close(URLContext *h)
{
TCPContext *s = h->priv_data;
closesocket(s->fd);
av_free(s);
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,
};
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