| /* |
| * 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 |
| */ |
| |
| /** |
| * @file libavformat/udp.c |
| * UDP protocol |
| */ |
| |
| #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */ |
| #include "avformat.h" |
| #include <unistd.h> |
| #include "network.h" |
| #include "os_support.h" |
| #if HAVE_SYS_SELECT_H |
| #include <sys/select.h> |
| #endif |
| #include <sys/time.h> |
| |
| #ifndef IPV6_ADD_MEMBERSHIP |
| #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP |
| #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP |
| #endif |
| #ifndef IN_MULTICAST |
| #define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000) |
| #endif |
| #ifndef IN6_IS_ADDR_MULTICAST |
| #define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff) |
| #endif |
| |
| typedef struct { |
| int udp_fd; |
| int ttl; |
| int buffer_size; |
| int is_multicast; |
| int local_port; |
| int reuse_socket; |
| #if !CONFIG_IPV6 |
| struct sockaddr_in dest_addr; |
| #else |
| struct sockaddr_storage dest_addr; |
| #endif |
| int dest_addr_len; |
| } UDPContext; |
| |
| #define UDP_TX_BUF_SIZE 32768 |
| #define UDP_MAX_PKT_SIZE 65536 |
| |
| static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) { |
| #ifdef IP_MULTICAST_TTL |
| if (addr->sa_family == AF_INET) { |
| if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) { |
| av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno)); |
| return -1; |
| } |
| } |
| #endif |
| #if CONFIG_IPV6 |
| if (addr->sa_family == AF_INET6) { |
| if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) { |
| av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno)); |
| return -1; |
| } |
| } |
| #endif |
| return 0; |
| } |
| |
| static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) { |
| #ifdef IP_ADD_MEMBERSHIP |
| if (addr->sa_family == AF_INET) { |
| struct ip_mreq mreq; |
| |
| 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) { |
| av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno)); |
| return -1; |
| } |
| } |
| #endif |
| #if CONFIG_IPV6 |
| if (addr->sa_family == AF_INET6) { |
| struct ipv6_mreq mreq6; |
| |
| 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) { |
| av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno)); |
| return -1; |
| } |
| } |
| #endif |
| return 0; |
| } |
| |
| static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) { |
| #ifdef IP_DROP_MEMBERSHIP |
| if (addr->sa_family == AF_INET) { |
| struct ip_mreq mreq; |
| |
| 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) { |
| av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno)); |
| return -1; |
| } |
| } |
| #endif |
| #if CONFIG_IPV6 |
| if (addr->sa_family == AF_INET6) { |
| struct ipv6_mreq mreq6; |
| |
| 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) { |
| av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno)); |
| return -1; |
| } |
| } |
| #endif |
| return 0; |
| } |
| |
| #if CONFIG_IPV6 |
| 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; |
| } |
| 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_set_url(struct sockaddr_storage *addr, const char *hostname, int port) { |
| struct addrinfo *res0; |
| int addr_len; |
| |
| res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0); |
| if (res0 == 0) return AVERROR(EIO); |
| memcpy(addr, res0->ai_addr, res0->ai_addrlen); |
| addr_len = res0->ai_addrlen; |
| freeaddrinfo(res0); |
| |
| return addr_len; |
| } |
| |
| static int is_multicast_address(struct sockaddr_storage *addr) |
| { |
| if (addr->ss_family == AF_INET) { |
| return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr)); |
| } |
| if (addr->ss_family == AF_INET6) { |
| return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr); |
| } |
| |
| return 0; |
| } |
| |
| static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len) |
| { |
| int udp_fd = -1; |
| struct addrinfo *res0 = NULL, *res = NULL; |
| int family = AF_UNSPEC; |
| |
| if (((struct sockaddr *) &s->dest_addr)->sa_family) |
| family = ((struct sockaddr *) &s->dest_addr)->sa_family; |
| res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, 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; |
| av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno)); |
| } |
| |
| if (udp_fd < 0) |
| goto fail; |
| |
| memcpy(addr, res->ai_addr, res->ai_addrlen); |
| *addr_len = res->ai_addrlen; |
| |
| freeaddrinfo(res0); |
| |
| return udp_fd; |
| |
| fail: |
| if (udp_fd >= 0) |
| closesocket(udp_fd); |
| if(res0) |
| freeaddrinfo(res0); |
| return -1; |
| } |
| |
| static int udp_port(struct sockaddr_storage *addr, int addr_len) |
| { |
| char sbuf[sizeof(int)*3+1]; |
| |
| if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) { |
| av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno)); |
| return -1; |
| } |
| |
| return strtol(sbuf, NULL, 10); |
| } |
| |
| #else |
| |
| static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port) |
| { |
| /* set the destination address */ |
| if (resolve_host(&addr->sin_addr, hostname) < 0) |
| return AVERROR(EIO); |
| addr->sin_family = AF_INET; |
| addr->sin_port = htons(port); |
| |
| return sizeof(struct sockaddr_in); |
| } |
| |
| static int is_multicast_address(struct sockaddr_in *addr) |
| { |
| return IN_MULTICAST(ntohl(addr->sin_addr.s_addr)); |
| } |
| |
| static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len) |
| { |
| int fd; |
| |
| fd = socket(AF_INET, SOCK_DGRAM, 0); |
| if (fd < 0) |
| return -1; |
| |
| addr->sin_family = AF_INET; |
| addr->sin_addr.s_addr = htonl (INADDR_ANY); |
| addr->sin_port = htons(s->local_port); |
| *addr_len = sizeof(struct sockaddr_in); |
| |
| return fd; |
| } |
| |
| static int udp_port(struct sockaddr_in *addr, int len) |
| { |
| return ntohs(addr->sin_port); |
| } |
| #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: '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) |
| { |
| 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 */ |
| s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port); |
| if (s->dest_addr_len < 0) { |
| return AVERROR(EIO); |
| } |
| s->is_multicast = is_multicast_address(&s->dest_addr); |
| |
| return 0; |
| } |
| |
| /** |
| * 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, bind_ret = -1; |
| UDPContext *s = NULL; |
| int is_output; |
| const char *p; |
| char buf[256]; |
| #if !CONFIG_IPV6 |
| struct sockaddr_in my_addr; |
| #else |
| struct sockaddr_storage my_addr; |
| #endif |
| int len; |
| |
| h->is_streamed = 1; |
| h->max_packet_size = 1472; |
| |
| is_output = (flags & URL_WRONLY); |
| |
| if(!ff_network_init()) |
| return AVERROR(EIO); |
| |
| s = av_mallocz(sizeof(UDPContext)); |
| if (!s) |
| return AVERROR(ENOMEM); |
| |
| h->priv_data = s; |
| s->ttl = 16; |
| s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE; |
| |
| p = strchr(uri, '?'); |
| if (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); |
| } |
| if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) { |
| s->buffer_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 (flags & URL_WRONLY) |
| goto fail; |
| } else { |
| udp_set_remote_url(h, uri); |
| } |
| |
| if (s->is_multicast && !(h->flags & URL_WRONLY)) |
| s->local_port = port; |
| udp_fd = udp_socket_create(s, &my_addr, &len); |
| if (udp_fd < 0) |
| goto fail; |
| |
| 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 multicast, try the multicast address bind first */ |
| if (s->is_multicast && !(h->flags & URL_WRONLY)) { |
| bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len); |
| } |
| /* bind to the local address if not multicast or if the multicast |
| * bind failed */ |
| if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) |
| goto fail; |
| |
| len = sizeof(my_addr); |
| getsockname(udp_fd, (struct sockaddr *)&my_addr, &len); |
| s->local_port = udp_port(&my_addr, len); |
| |
| if (s->is_multicast) { |
| if (h->flags & URL_WRONLY) { |
| /* output */ |
| if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0) |
| goto fail; |
| } else { |
| /* input */ |
| if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0) |
| goto fail; |
| } |
| } |
| |
| if (is_output) { |
| /* limit the tx buf size to limit latency */ |
| tmp = s->buffer_size; |
| if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) { |
| av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno)); |
| goto fail; |
| } |
| } else { |
| /* set udp recv buffer size to the largest possible udp packet size to |
| * avoid losing data on OSes that set this too low by default. */ |
| tmp = s->buffer_size; |
| if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) { |
| av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno)); |
| } |
| /* make the socket non-blocking */ |
| ff_socket_nonblock(udp_fd, 1); |
| } |
| |
| 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; |
| int len; |
| fd_set rfds; |
| int ret; |
| struct timeval tv; |
| |
| for(;;) { |
| if (url_interrupt_cb()) |
| return AVERROR(EINTR); |
| FD_ZERO(&rfds); |
| FD_SET(s->udp_fd, &rfds); |
| tv.tv_sec = 0; |
| tv.tv_usec = 100 * 1000; |
| ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv); |
| if (ret < 0) |
| return AVERROR(EIO); |
| if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds))) |
| continue; |
| len = recv(s->udp_fd, buf, size, 0); |
| 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, |
| s->dest_addr_len); |
| 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; |
| |
| if (s->is_multicast && !(h->flags & URL_WRONLY)) |
| udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr); |
| closesocket(s->udp_fd); |
| ff_network_close(); |
| av_free(s); |
| return 0; |
| } |
| |
| URLProtocol udp_protocol = { |
| "udp", |
| udp_open, |
| udp_read, |
| udp_write, |
| NULL, /* seek */ |
| udp_close, |
| }; |