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ffmpeg/libavformat/tcp.c

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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 "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/parseutils.h"
#include "libavutil/opt.h"
#include "libavutil/time.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;
char *local_port;
char *local_addr;
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 },
{ "local_port", "Local port", OFFSET(local_port), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, .flags = D|E },
{ "local_addr", "Local address", OFFSET(local_addr), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, .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 int customize_fd(void *ctx, int fd, int family)
{
TCPContext *s = ctx;
if (s->local_addr || s->local_port) {
struct addrinfo hints = { 0 }, *ai, *cur_ai;
int ret;
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
ret = getaddrinfo(s->local_addr, s->local_port, &hints, &ai);
if (ret) {
av_log(ctx, AV_LOG_ERROR,
"Failed to getaddrinfo local addr: %s port: %s err: %s\n",
s->local_addr, s->local_port, gai_strerror(ret));
return ret;
}
cur_ai = ai;
while (cur_ai) {
ret = bind(fd, (struct sockaddr *)cur_ai->ai_addr, (int)cur_ai->ai_addrlen);
if (ret)
cur_ai = cur_ai->ai_next;
else
break;
}
freeaddrinfo(ai);
if (ret) {
ff_log_net_error(ctx, AV_LOG_ERROR, "bind local failed");
return ret;
}
}
/* 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 0;
}
/* 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), "local_port", p)) {
av_freep(&s->local_port);
s->local_port = av_strdup(buf);
if (!s->local_port)
return AVERROR(ENOMEM);
}
if (av_find_info_tag(buf, sizeof(buf), "local_addr", p)) {
av_freep(&s->local_addr);
s->local_addr = av_strdup(buf);
if (!s->local_addr)
return AVERROR(ENOMEM);
}
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 (av_find_info_tag(buf, sizeof(buf), "tcp_nodelay", p)) {
s->tcp_nodelay = 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, h);
if (fd < 0) {
ret = ff_neterrno();
cur_ai = cur_ai->ai_next;
}
}
if (fd < 0)
goto fail1;
customize_fd(s, fd, cur_ai->ai_family);
}
if (s->listen == 2) {
// multi-client
if ((ret = ff_listen(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h)) < 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,
};
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