forked from KolibriOS/kolibrios
146 lines
4.7 KiB
C
146 lines
4.7 KiB
C
/*
|
|
* SRTP network protocol
|
|
* Copyright (c) 2012 Martin Storsjo
|
|
*
|
|
* 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 "libavutil/opt.h"
|
|
#include "avformat.h"
|
|
#include "avio_internal.h"
|
|
#include "url.h"
|
|
|
|
#include "internal.h"
|
|
#include "rtpdec.h"
|
|
#include "srtp.h"
|
|
|
|
typedef struct SRTPProtoContext {
|
|
const AVClass *class;
|
|
URLContext *rtp_hd;
|
|
const char *out_suite, *out_params;
|
|
const char *in_suite, *in_params;
|
|
struct SRTPContext srtp_out, srtp_in;
|
|
uint8_t encryptbuf[RTP_MAX_PACKET_LENGTH];
|
|
} SRTPProtoContext;
|
|
|
|
#define D AV_OPT_FLAG_DECODING_PARAM
|
|
#define E AV_OPT_FLAG_ENCODING_PARAM
|
|
static const AVOption options[] = {
|
|
{ "srtp_out_suite", "", offsetof(SRTPProtoContext, out_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
|
|
{ "srtp_out_params", "", offsetof(SRTPProtoContext, out_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
|
|
{ "srtp_in_suite", "", offsetof(SRTPProtoContext, in_suite), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
|
|
{ "srtp_in_params", "", offsetof(SRTPProtoContext, in_params), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVClass srtp_context_class = {
|
|
.class_name = "srtp",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
static int srtp_close(URLContext *h)
|
|
{
|
|
SRTPProtoContext *s = h->priv_data;
|
|
ff_srtp_free(&s->srtp_out);
|
|
ff_srtp_free(&s->srtp_in);
|
|
ffurl_close(s->rtp_hd);
|
|
s->rtp_hd = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int srtp_open(URLContext *h, const char *uri, int flags)
|
|
{
|
|
SRTPProtoContext *s = h->priv_data;
|
|
char hostname[256], buf[1024], path[1024];
|
|
int rtp_port, ret;
|
|
|
|
if (s->out_suite && s->out_params)
|
|
if ((ret = ff_srtp_set_crypto(&s->srtp_out, s->out_suite, s->out_params)) < 0)
|
|
goto fail;
|
|
if (s->in_suite && s->in_params)
|
|
if ((ret = ff_srtp_set_crypto(&s->srtp_in, s->in_suite, s->in_params)) < 0)
|
|
goto fail;
|
|
|
|
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
|
|
path, sizeof(path), uri);
|
|
ff_url_join(buf, sizeof(buf), "rtp", NULL, hostname, rtp_port, "%s", path);
|
|
if ((ret = ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL)) < 0)
|
|
goto fail;
|
|
|
|
h->max_packet_size = FFMIN(s->rtp_hd->max_packet_size,
|
|
sizeof(s->encryptbuf)) - 14;
|
|
h->is_streamed = 1;
|
|
return 0;
|
|
|
|
fail:
|
|
srtp_close(h);
|
|
return ret;
|
|
}
|
|
|
|
static int srtp_read(URLContext *h, uint8_t *buf, int size)
|
|
{
|
|
SRTPProtoContext *s = h->priv_data;
|
|
int ret;
|
|
start:
|
|
ret = ffurl_read(s->rtp_hd, buf, size);
|
|
if (ret > 0 && s->srtp_in.aes) {
|
|
if (ff_srtp_decrypt(&s->srtp_in, buf, &ret) < 0)
|
|
goto start;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int srtp_write(URLContext *h, const uint8_t *buf, int size)
|
|
{
|
|
SRTPProtoContext *s = h->priv_data;
|
|
if (!s->srtp_out.aes)
|
|
return ffurl_write(s->rtp_hd, buf, size);
|
|
size = ff_srtp_encrypt(&s->srtp_out, buf, size, s->encryptbuf,
|
|
sizeof(s->encryptbuf));
|
|
if (size < 0)
|
|
return size;
|
|
return ffurl_write(s->rtp_hd, s->encryptbuf, size);
|
|
}
|
|
|
|
static int srtp_get_file_handle(URLContext *h)
|
|
{
|
|
SRTPProtoContext *s = h->priv_data;
|
|
return ffurl_get_file_handle(s->rtp_hd);
|
|
}
|
|
|
|
static int srtp_get_multi_file_handle(URLContext *h, int **handles,
|
|
int *numhandles)
|
|
{
|
|
SRTPProtoContext *s = h->priv_data;
|
|
return ffurl_get_multi_file_handle(s->rtp_hd, handles, numhandles);
|
|
}
|
|
|
|
URLProtocol ff_srtp_protocol = {
|
|
.name = "srtp",
|
|
.url_open = srtp_open,
|
|
.url_read = srtp_read,
|
|
.url_write = srtp_write,
|
|
.url_close = srtp_close,
|
|
.url_get_file_handle = srtp_get_file_handle,
|
|
.url_get_multi_file_handle = srtp_get_multi_file_handle,
|
|
.priv_data_size = sizeof(SRTPProtoContext),
|
|
.priv_data_class = &srtp_context_class,
|
|
.flags = URL_PROTOCOL_FLAG_NETWORK,
|
|
};
|