mirror of https://github.com/FFmpeg/FFmpeg.git
* commit '2f3bada63e57345329c4f9b48e9b81b5cfc03d05': lavf: Add a protocol for SRTP encryption/decryption rtsp: Support decryption of SRTP signalled via RFC 4568 (SDES) Conflicts: libavformat/version.h Merged-by: Michael Niedermayer <michaelni@gmx.at>pull/8/head
Michael Niedermayer
12 years ago
commit
b52925d2cd
9 changed files with 185 additions and 4 deletions
@ -0,0 +1,144 @@ |
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/*
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* SRTP network protocol |
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* Copyright (c) 2012 Martin Storsjo |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/opt.h" |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "url.h" |
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#include "internal.h" |
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#include "srtp.h" |
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typedef struct SRTPProtoContext { |
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const AVClass *class; |
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URLContext *rtp_hd; |
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const char *out_suite, *out_params; |
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const char *in_suite, *in_params; |
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struct SRTPContext srtp_out, srtp_in; |
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uint8_t encryptbuf[1500]; |
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} SRTPProtoContext; |
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#define D AV_OPT_FLAG_DECODING_PARAM |
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#define E AV_OPT_FLAG_ENCODING_PARAM |
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static const AVOption options[] = { |
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{ "srtp_out_suite", "", offsetof(SRTPProtoContext, out_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E }, |
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{ "srtp_out_params", "", offsetof(SRTPProtoContext, out_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E }, |
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{ "srtp_in_suite", "", offsetof(SRTPProtoContext, in_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E }, |
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{ "srtp_in_params", "", offsetof(SRTPProtoContext, in_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E }, |
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{ NULL } |
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}; |
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static const AVClass srtp_context_class = { |
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.class_name = "srtp", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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static int srtp_close(URLContext *h) |
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{ |
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SRTPProtoContext *s = h->priv_data; |
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ff_srtp_free(&s->srtp_out); |
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ff_srtp_free(&s->srtp_in); |
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ffurl_close(s->rtp_hd); |
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s->rtp_hd = NULL; |
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return 0; |
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} |
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static int srtp_open(URLContext *h, const char *uri, int flags) |
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{ |
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SRTPProtoContext *s = h->priv_data; |
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char hostname[256], buf[1024], path[1024]; |
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int rtp_port, ret; |
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if (s->out_suite && s->out_params) |
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if ((ret = ff_srtp_set_crypto(&s->srtp_out, s->out_suite, s->out_params)) < 0) |
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goto fail; |
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if (s->in_suite && s->in_params) |
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if ((ret = ff_srtp_set_crypto(&s->srtp_in, s->in_suite, s->in_params)) < 0) |
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goto fail; |
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av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port, |
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path, sizeof(path), uri); |
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ff_url_join(buf, sizeof(buf), "rtp", NULL, hostname, rtp_port, "%s", path); |
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if ((ret = ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL)) < 0) |
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goto fail; |
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h->max_packet_size = FFMIN(s->rtp_hd->max_packet_size, |
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sizeof(s->encryptbuf)) - 14; |
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h->is_streamed = 1; |
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return 0; |
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fail: |
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srtp_close(h); |
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return ret; |
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} |
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static int srtp_read(URLContext *h, uint8_t *buf, int size) |
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{ |
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SRTPProtoContext *s = h->priv_data; |
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int ret; |
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start: |
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ret = ffurl_read(s->rtp_hd, buf, size); |
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if (ret > 0 && s->srtp_in.aes) { |
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if (ff_srtp_decrypt(&s->srtp_in, buf, &ret) < 0) |
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goto start; |
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} |
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return ret; |
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} |
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static int srtp_write(URLContext *h, const uint8_t *buf, int size) |
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{ |
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SRTPProtoContext *s = h->priv_data; |
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if (!s->srtp_out.aes) |
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return ffurl_write(s->rtp_hd, buf, size); |
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size = ff_srtp_encrypt(&s->srtp_out, buf, size, s->encryptbuf, |
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sizeof(s->encryptbuf)); |
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if (size < 0) |
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return size; |
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return ffurl_write(s->rtp_hd, s->encryptbuf, size); |
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} |
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static int srtp_get_file_handle(URLContext *h) |
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{ |
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SRTPProtoContext *s = h->priv_data; |
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return ffurl_get_file_handle(s->rtp_hd); |
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} |
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static int srtp_get_multi_file_handle(URLContext *h, int **handles, |
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int *numhandles) |
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{ |
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SRTPProtoContext *s = h->priv_data; |
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return ffurl_get_multi_file_handle(s->rtp_hd, handles, numhandles); |
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} |
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URLProtocol ff_srtp_protocol = { |
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.name = "srtp", |
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.url_open = srtp_open, |
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.url_read = srtp_read, |
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.url_write = srtp_write, |
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.url_close = srtp_close, |
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.url_get_file_handle = srtp_get_file_handle, |
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.url_get_multi_file_handle = srtp_get_multi_file_handle, |
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.priv_data_size = sizeof(SRTPProtoContext), |
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.priv_data_class = &srtp_context_class, |
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.flags = URL_PROTOCOL_FLAG_NETWORK, |
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}; |
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