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FFmpeg/libavformat/udp.c

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/*
* UDP prototype streaming system
* Copyright (c) 2000, 2001, 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 "network.h"
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
typedef struct {
int udp_fd;
int ttl;
int is_multicast;
int local_port;
int reuse_socket;
#ifndef CONFIG_IPV6
struct ip_mreq mreq;
struct sockaddr_in dest_addr;
#else
struct sockaddr_storage dest_addr;
size_t dest_addr_len;
#endif
} UDPContext;
#define UDP_TX_BUF_SIZE 32768
#ifdef CONFIG_IPV6
static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
if (addr->sa_family == AF_INET) {
if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
perror("setsockopt(IP_MULTICAST_TTL)");
return -1;
}
}
if (addr->sa_family == AF_INET6) {
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
perror("setsockopt(IPV6_MULTICAST_HOPS)");
return -1;
}
}
return 0;
}
static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
struct ip_mreq mreq;
struct ipv6_mreq mreq6;
if (addr->sa_family == AF_INET) {
mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
mreq.imr_interface.s_addr= INADDR_ANY;
if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
perror("setsockopt(IP_ADD_MEMBERSHIP)");
return -1;
}
}
if (addr->sa_family == AF_INET6) {
memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
mreq6.ipv6mr_interface= 0;
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
return -1;
}
}
return 0;
}
static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
struct ip_mreq mreq;
struct ipv6_mreq mreq6;
if (addr->sa_family == AF_INET) {
mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
mreq.imr_interface.s_addr= INADDR_ANY;
if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
perror("setsockopt(IP_DROP_MEMBERSHIP)");
return -1;
}
}
if (addr->sa_family == AF_INET6) {
memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
mreq6.ipv6mr_interface= 0;
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
return -1;
}
}
return 0;
}
static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
struct addrinfo hints, *res = 0;
int error;
char sport[16];
const char *node = 0, *service = 0;
if (port > 0) {
snprintf(sport, sizeof(sport), "%d", port);
service = sport;
}
if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
node = hostname;
}
if ((node) || (service)) {
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = type;
hints.ai_family = family;
hints.ai_flags = flags;
if ((error = getaddrinfo(node, service, &hints, &res))) {
av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
}
}
return res;
}
static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
UDPContext *s = h->priv_data;
char hostname[256];
int port;
struct addrinfo *res0;
url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
if (res0 == 0) return AVERROR(EIO);
memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
s->dest_addr_len = res0->ai_addrlen;
freeaddrinfo(res0);
return 0;
}
static int udp_ipv6_set_local(URLContext *h) {
UDPContext *s = h->priv_data;
int udp_fd = -1;
struct sockaddr_storage clientaddr;
socklen_t addrlen;
char sbuf[NI_MAXSERV];
char hbuf[NI_MAXHOST];
struct addrinfo *res0 = NULL, *res = NULL;
if (s->local_port != 0) {
res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
if (res0 == 0)
goto fail;
for (res = res0; res; res=res->ai_next) {
udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
if (udp_fd > 0) break;
perror("socket");
}
} else {
udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
if (udp_fd < 0)
perror("socket");
}
if (udp_fd < 0)
goto fail;
if (s->local_port != 0) {
if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
perror("bind");
goto fail;
}
freeaddrinfo(res0);
res0 = NULL;
}
addrlen = sizeof(clientaddr);
if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
perror("getsockname");
goto fail;
}
if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
perror("getnameinfo");
goto fail;
}
s->local_port = strtol(sbuf, NULL, 10);
return udp_fd;
fail:
if (udp_fd >= 0)
closesocket(udp_fd);
if(res0)
freeaddrinfo(res0);
return -1;
}
#endif /* CONFIG_IPV6 */
/**
* If no filename is given to av_open_input_file because you want to
* get the local port first, then you must call this function to set
* the remote server address.
*
* url syntax: udp://host:port[?option=val...]
* option: 'multicast=1' : enable multicast
* 'ttl=n' : set the ttl value (for multicast only)
* 'localport=n' : set the local port
* 'pkt_size=n' : set max packet size
* 'reuse=1' : enable reusing the socket
*
* @param s1 media file context
* @param uri of the remote server
* @return zero if no error.
*/
int udp_set_remote_url(URLContext *h, const char *uri)
{
#ifdef CONFIG_IPV6
return udp_ipv6_set_remote_url(h, uri);
#else
UDPContext *s = h->priv_data;
char hostname[256];
int port;
url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
/* set the destination address */
if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
return AVERROR(EIO);
s->dest_addr.sin_family = AF_INET;
s->dest_addr.sin_port = htons(port);
return 0;
#endif
}
/**
* Return the local port used by the UDP connexion
* @param s1 media file context
* @return the local port number
*/
int udp_get_local_port(URLContext *h)
{
UDPContext *s = h->priv_data;
return s->local_port;
}
/**
* Return the udp file handle for select() usage to wait for several RTP
* streams at the same time.
* @param h media file context
*/
int udp_get_file_handle(URLContext *h)
{
UDPContext *s = h->priv_data;
return s->udp_fd;
}
/* put it in UDP context */
/* return non zero if error */
static int udp_open(URLContext *h, const char *uri, int flags)
{
char hostname[1024];
int port, udp_fd = -1, tmp;
UDPContext *s = NULL;
int is_output;
const char *p;
char buf[256];
#ifndef CONFIG_IPV6
struct sockaddr_in my_addr, my_addr1;
int len;
#endif
h->is_streamed = 1;
h->max_packet_size = 1472;
is_output = (flags & URL_WRONLY);
s = av_malloc(sizeof(UDPContext));
if (!s)
return AVERROR(ENOMEM);
h->priv_data = s;
s->ttl = 16;
s->is_multicast = 0;
s->local_port = 0;
s->reuse_socket = 0;
p = strchr(uri, '?');
if (p) {
s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
s->ttl = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localport", p)) {
s->local_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
h->max_packet_size = strtol(buf, NULL, 10);
}
}
/* fill the dest addr */
url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
/* XXX: fix url_split */
if (hostname[0] == '\0' || hostname[0] == '?') {
/* only accepts null hostname if input */
if (s->is_multicast || (flags & URL_WRONLY))
goto fail;
} else {
udp_set_remote_url(h, uri);
}
#ifndef CONFIG_IPV6
udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (udp_fd < 0)
goto fail;
my_addr.sin_family = AF_INET;
my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
if (s->is_multicast && !(h->flags & URL_WRONLY)) {
/* special case: the bind must be done on the multicast address port */
my_addr.sin_port = s->dest_addr.sin_port;
} else {
my_addr.sin_port = htons(s->local_port);
}
if (s->reuse_socket)
if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
goto fail;
/* the bind is needed to give a port to the socket now */
if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
goto fail;
len = sizeof(my_addr1);
getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
s->local_port = ntohs(my_addr1.sin_port);
#ifdef IP_MULTICAST_TTL
if (s->is_multicast) {
if (h->flags & URL_WRONLY) {
/* output */
if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
&s->ttl, sizeof(s->ttl)) < 0) {
perror("IP_MULTICAST_TTL");
goto fail;
}
} else {
/* input */
memset(&s->mreq, 0, sizeof(s->mreq));
s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
&s->mreq, sizeof(s->mreq)) < 0) {
perror("rtp: IP_ADD_MEMBERSHIP");
goto fail;
}
}
}
#endif
#else
if (s->is_multicast && !(h->flags & URL_WRONLY))
s->local_port = port;
udp_fd = udp_ipv6_set_local(h);
if (udp_fd < 0)
goto fail;
if (s->is_multicast) {
if (h->flags & URL_WRONLY) {
if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
goto fail;
} else {
if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
goto fail;
}
}
#endif /* CONFIG_IPV6 */
if (is_output) {
/* limit the tx buf size to limit latency */
tmp = UDP_TX_BUF_SIZE;
if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
perror("setsockopt sndbuf");
goto fail;
}
}
s->udp_fd = udp_fd;
return 0;
fail:
if (udp_fd >= 0)
closesocket(udp_fd);
av_free(s);
return AVERROR(EIO);
}
static int udp_read(URLContext *h, uint8_t *buf, int size)
{
UDPContext *s = h->priv_data;
#ifndef CONFIG_IPV6
struct sockaddr_in from;
#else
struct sockaddr_storage from;
#endif
socklen_t from_len;
int len;
for(;;) {
from_len = sizeof(from);
len = recvfrom (s->udp_fd, buf, size, 0,
(struct sockaddr *)&from, &from_len);
if (len < 0) {
if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
ff_neterrno() != FF_NETERROR(EINTR))
return AVERROR(EIO);
} else {
break;
}
}
return len;
}
static int udp_write(URLContext *h, uint8_t *buf, int size)
{
UDPContext *s = h->priv_data;
int ret;
for(;;) {
ret = sendto (s->udp_fd, buf, size, 0,
(struct sockaddr *) &s->dest_addr,
#ifndef CONFIG_IPV6
sizeof (s->dest_addr));
#else
s->dest_addr_len);
#endif
if (ret < 0) {
if (ff_neterrno() != FF_NETERROR(EINTR) &&
ff_neterrno() != FF_NETERROR(EAGAIN))
return AVERROR(EIO);
} else {
break;
}
}
return size;
}
static int udp_close(URLContext *h)
{
UDPContext *s = h->priv_data;
#ifndef CONFIG_IPV6
#ifdef IP_DROP_MEMBERSHIP
if (s->is_multicast && !(h->flags & URL_WRONLY)) {
if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
&s->mreq, sizeof(s->mreq)) < 0) {
perror("IP_DROP_MEMBERSHIP");
}
}
#endif
#else
if (s->is_multicast && !(h->flags & URL_WRONLY))
udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
#endif
closesocket(s->udp_fd);
av_free(s);
return 0;
}
URLProtocol udp_protocol = {
"udp",
udp_open,
udp_read,
udp_write,
NULL, /* seek */
udp_close,
};