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/*
* 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 <unistd.h>
#include "internal.h"
#include "network.h"
#include "os_support.h"
#if HAVE_SYS_SELECT_H
#include <sys/select.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;
fd_set wfds, efds;
int fd_max, ret;
struct timeval tv;
socklen_t optlen;
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);
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(NULL, AV_LOG_ERROR,
"Failed to resolve hostname %s: %s\n",
hostname, gai_strerror(ret));
return AVERROR(EIO);
}
cur_ai = ai;
restart:
fd = socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol);
if (fd < 0)
goto fail;
ff_socket_nonblock(fd, 1);
redo:
ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
if (ret < 0) {
if (ff_neterrno() == FF_NETERROR(EINTR)) {
if (url_interrupt_cb())
goto fail1;
goto redo;
}
if (ff_neterrno() != FF_NETERROR(EINPROGRESS) &&
ff_neterrno() != FF_NETERROR(EAGAIN))
goto fail;
/* wait until we are connected or until abort */
for(;;) {
if (url_interrupt_cb()) {
ret = AVERROR(EINTR);
goto fail1;
}
fd_max = fd;
FD_ZERO(&wfds);
FD_ZERO(&efds);
FD_SET(fd, &wfds);
FD_SET(fd, &efds);
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
ret = select(fd_max + 1, NULL, &wfds, &efds, &tv);
if (ret > 0 && (FD_ISSET(fd, &wfds) || FD_ISSET(fd, &efds)))
break;
}
/* test error */
optlen = sizeof(ret);
getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen);
if (ret != 0) {
av_log(NULL, AV_LOG_ERROR,
"TCP connection to %s:%d failed: %s\n",
hostname, port, strerror(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;
}
ret = AVERROR(EIO);
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 len, fd_max, ret;
fd_set rfds;
struct timeval tv;
for (;;) {
if (url_interrupt_cb())
return AVERROR(EINTR);
fd_max = s->fd;
FD_ZERO(&rfds);
FD_SET(s->fd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
ret = select(fd_max + 1, &rfds, NULL, NULL, &tv);
if (ret > 0 && FD_ISSET(s->fd, &rfds)) {
len = recv(s->fd, buf, size, 0);
if (len < 0) {
if (ff_neterrno() != FF_NETERROR(EINTR) &&
ff_neterrno() != FF_NETERROR(EAGAIN))
return ff_neterrno();
} else return len;
} else if (ret < 0) {
if (ff_neterrno() == FF_NETERROR(EINTR))
continue;
return -1;
}
}
}
static int tcp_write(URLContext *h, const uint8_t *buf, int size)
{
TCPContext *s = h->priv_data;
int ret, size1, fd_max, len;
fd_set wfds;
struct timeval tv;
size1 = size;
while (size > 0) {
if (url_interrupt_cb())
return AVERROR(EINTR);
fd_max = s->fd;
FD_ZERO(&wfds);
FD_SET(s->fd, &wfds);
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
ret = select(fd_max + 1, NULL, &wfds, NULL, &tv);
if (ret > 0 && FD_ISSET(s->fd, &wfds)) {
len = send(s->fd, buf, size, 0);
if (len < 0) {
if (ff_neterrno() != FF_NETERROR(EINTR) &&
ff_neterrno() != FF_NETERROR(EAGAIN))
return ff_neterrno();
continue;
}
size -= len;
buf += len;
} else if (ret < 0) {
if (ff_neterrno() == FF_NETERROR(EINTR))
continue;
return -1;
}
}
return size1 - size;
}
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 = {
"tcp",
tcp_open,
tcp_read,
tcp_write,
NULL, /* seek */
tcp_close,
.url_get_file_handle = tcp_get_file_handle,
};
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