| 0,0 → 1,332 |
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| /* |
| * SCTP protocol |
| * Copyright (c) 2012 Luca Barbato |
| * |
| * 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 |
| * |
| * sctp url_protocol |
| * |
| * url syntax: sctp://host:port[?option=val...] |
| * option: 'listen' : listen for an incoming connection |
| * 'max_streams=n' : set the maximum number of streams |
| * 'reuse=1' : enable reusing the socket [TBD] |
| * |
| * by setting the maximum number of streams the protocol will use the |
| * first two bytes of the incoming/outgoing buffer to store the |
| * stream number of the packet being read/written. |
| * @see sctp_read |
| * @see sctp_write |
| */ |
| |
| |
| #include <netinet/in.h> |
| #include <netinet/sctp.h> |
| |
| #include "config.h" |
| |
| #if HAVE_POLL_H |
| #include <poll.h> |
| #endif |
| |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/parseutils.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "network.h" |
| #include "os_support.h" |
| #include "url.h" |
| |
| /* |
| * The sctp_recvmsg and sctp_sendmsg functions are part of the user |
| * library that offers support for the SCTP kernel Implementation. |
| * To avoid build-time clashes the functions sport an ff_-prefix here. |
| * The main purpose of this code is to provide the SCTP Socket API |
| * mappings for user applications to interface with SCTP in the kernel. |
| * |
| * This implementation is based on the Socket API Extensions for SCTP |
| * defined in <draft-ietf-tsvwg-sctpsocket-10.txt> |
| * |
| * Copyright (c) 2003 International Business Machines, Corp. |
| * |
| * Written or modified by: |
| * Ryan Layer <rmlayer@us.ibm.com> |
| */ |
| |
| static int ff_sctp_recvmsg(int s, void *msg, size_t len, struct sockaddr *from, |
| socklen_t *fromlen, struct sctp_sndrcvinfo *sinfo, |
| int *msg_flags) |
| { |
| int recvb; |
| struct iovec iov; |
| char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
| struct msghdr inmsg = { 0 }; |
| struct cmsghdr *cmsg = NULL; |
| |
| iov.iov_base = msg; |
| iov.iov_len = len; |
| |
| inmsg.msg_name = from; |
| inmsg.msg_namelen = fromlen ? *fromlen : 0; |
| inmsg.msg_iov = &iov; |
| inmsg.msg_iovlen = 1; |
| inmsg.msg_control = incmsg; |
| inmsg.msg_controllen = sizeof(incmsg); |
| |
| if ((recvb = recvmsg(s, &inmsg, msg_flags ? *msg_flags : 0)) < 0) |
| return recvb; |
| |
| if (fromlen) |
| *fromlen = inmsg.msg_namelen; |
| if (msg_flags) |
| *msg_flags = inmsg.msg_flags; |
| |
| for (cmsg = CMSG_FIRSTHDR(&inmsg); cmsg != NULL; |
| cmsg = CMSG_NXTHDR(&inmsg, cmsg)) { |
| if ((IPPROTO_SCTP == cmsg->cmsg_level) && |
| (SCTP_SNDRCV == cmsg->cmsg_type)) |
| break; |
| } |
| |
| /* Copy sinfo. */ |
| if (cmsg) |
| memcpy(sinfo, CMSG_DATA(cmsg), sizeof(struct sctp_sndrcvinfo)); |
| |
| return recvb; |
| } |
| |
| static int ff_sctp_send(int s, const void *msg, size_t len, |
| const struct sctp_sndrcvinfo *sinfo, int flags) |
| { |
| struct msghdr outmsg; |
| struct iovec iov; |
| |
| outmsg.msg_name = NULL; |
| outmsg.msg_namelen = 0; |
| outmsg.msg_iov = &iov; |
| iov.iov_base = (void*)msg; |
| iov.iov_len = len; |
| outmsg.msg_iovlen = 1; |
| outmsg.msg_controllen = 0; |
| |
| if (sinfo) { |
| char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
| struct cmsghdr *cmsg; |
| |
| outmsg.msg_control = outcmsg; |
| outmsg.msg_controllen = sizeof(outcmsg); |
| outmsg.msg_flags = 0; |
| |
| cmsg = CMSG_FIRSTHDR(&outmsg); |
| cmsg->cmsg_level = IPPROTO_SCTP; |
| cmsg->cmsg_type = SCTP_SNDRCV; |
| cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); |
| |
| outmsg.msg_controllen = cmsg->cmsg_len; |
| memcpy(CMSG_DATA(cmsg), sinfo, sizeof(struct sctp_sndrcvinfo)); |
| } |
| |
| return sendmsg(s, &outmsg, flags); |
| } |
| |
| typedef struct SCTPContext { |
| int fd; |
| int max_streams; |
| struct sockaddr_storage dest_addr; |
| socklen_t dest_addr_len; |
| } SCTPContext; |
| |
| static int sctp_open(URLContext *h, const char *uri, int flags) |
| { |
| struct addrinfo *ai, *cur_ai; |
| struct addrinfo hints = { 0 }; |
| struct sctp_event_subscribe event = { 0 }; |
| struct sctp_initmsg initparams = { 0 }; |
| int port; |
| int fd = -1; |
| SCTPContext *s = h->priv_data; |
| const char *p; |
| char buf[256]; |
| int ret, listen_socket = 0; |
| 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, "sctp")) |
| return AVERROR(EINVAL); |
| if (port <= 0 || port >= 65536) { |
| av_log(s, AV_LOG_ERROR, "Port missing in uri\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| s->max_streams = 0; |
| 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), "max_streams", p)) |
| s->max_streams = strtol(buf, NULL, 10); |
| } |
| |
| 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; |
| |
| fd = ff_socket(cur_ai->ai_family, SOCK_STREAM, IPPROTO_SCTP); |
| if (fd < 0) |
| goto fail; |
| |
| s->dest_addr_len = sizeof(s->dest_addr); |
| |
| if (listen_socket) { |
| int fd1; |
| ret = bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen); |
| listen(fd, 100); |
| fd1 = accept(fd, NULL, NULL); |
| closesocket(fd); |
| fd = fd1; |
| } else |
| ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen); |
| |
| ff_socket_nonblock(fd, 1); |
| |
| event.sctp_data_io_event = 1; |
| /* TODO: Subscribe to more event types and handle them */ |
| |
| if (setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, |
| sizeof(event)) != 0) { |
| av_log(h, AV_LOG_ERROR, |
| "SCTP ERROR: Unable to subscribe to events\n"); |
| goto fail; |
| } |
| |
| if (s->max_streams) { |
| initparams.sinit_max_instreams = s->max_streams; |
| initparams.sinit_num_ostreams = s->max_streams; |
| if (setsockopt(fd, IPPROTO_SCTP, SCTP_INITMSG, &initparams, |
| sizeof(initparams)) < 0) |
| av_log(h, AV_LOG_ERROR, |
| "SCTP ERROR: Unable to initialize socket max streams %d\n", |
| s->max_streams); |
| } |
| |
| h->priv_data = s; |
| h->is_streamed = 1; |
| s->fd = fd; |
| freeaddrinfo(ai); |
| return 0; |
| |
| fail: |
| ret = AVERROR(EIO); |
| freeaddrinfo(ai); |
| return ret; |
| } |
| |
| static int sctp_wait_fd(int fd, int write) |
| { |
| int ev = write ? POLLOUT : POLLIN; |
| struct pollfd p = { .fd = fd, .events = ev, .revents = 0 }; |
| int ret; |
| |
| ret = poll(&p, 1, 100); |
| return ret < 0 ? ff_neterrno() : p.revents & ev ? 0 : AVERROR(EAGAIN); |
| } |
| |
| static int sctp_read(URLContext *h, uint8_t *buf, int size) |
| { |
| SCTPContext *s = h->priv_data; |
| int ret; |
| |
| if (!(h->flags & AVIO_FLAG_NONBLOCK)) { |
| ret = sctp_wait_fd(s->fd, 0); |
| if (ret < 0) |
| return ret; |
| } |
| |
| if (s->max_streams) { |
| /*StreamId is introduced as a 2byte code into the stream*/ |
| struct sctp_sndrcvinfo info = { 0 }; |
| ret = ff_sctp_recvmsg(s->fd, buf + 2, size - 2, NULL, 0, &info, 0); |
| AV_WB16(buf, info.sinfo_stream); |
| ret = ret < 0 ? ret : ret + 2; |
| } else |
| ret = recv(s->fd, buf, size, 0); |
| |
| return ret < 0 ? ff_neterrno() : ret; |
| } |
| |
| static int sctp_write(URLContext *h, const uint8_t *buf, int size) |
| { |
| SCTPContext *s = h->priv_data; |
| int ret; |
| |
| if (!(h->flags & AVIO_FLAG_NONBLOCK)) { |
| ret = sctp_wait_fd(s->fd, 1); |
| if (ret < 0) |
| return ret; |
| } |
| |
| if (s->max_streams) { |
| /*StreamId is introduced as a 2byte code into the stream*/ |
| struct sctp_sndrcvinfo info = { 0 }; |
| info.sinfo_stream = AV_RB16(buf); |
| if (info.sinfo_stream > s->max_streams) { |
| av_log(h, AV_LOG_ERROR, "bad input data\n"); |
| return AVERROR(EINVAL); |
| } |
| ret = ff_sctp_send(s->fd, buf + 2, size - 2, &info, MSG_EOR); |
| } else |
| ret = send(s->fd, buf, size, 0); |
| |
| return ret < 0 ? ff_neterrno() : ret; |
| } |
| |
| static int sctp_close(URLContext *h) |
| { |
| SCTPContext *s = h->priv_data; |
| closesocket(s->fd); |
| return 0; |
| } |
| |
| static int sctp_get_file_handle(URLContext *h) |
| { |
| SCTPContext *s = h->priv_data; |
| return s->fd; |
| } |
| |
| URLProtocol ff_sctp_protocol = { |
| .name = "sctp", |
| .url_open = sctp_open, |
| .url_read = sctp_read, |
| .url_write = sctp_write, |
| .url_close = sctp_close, |
| .url_get_file_handle = sctp_get_file_handle, |
| .priv_data_size = sizeof(SCTPContext), |
| .flags = URL_PROTOCOL_FLAG_NETWORK, |
| }; |