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Implement Realmedia/RTSP-compatible SETUP command. This includes calculation

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of the "RealChallenge2" response, which is some sort of authentication. See
discussion in "Realmedia patch" thread on ffmpeg-devel.

Originally committed as revision 15170 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2008-09-03 04:44:58 +00:00
parent bea6c1ec80
commit e9dea59f16
4 changed files with 143 additions and 7 deletions
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2
libavformat/Makefile
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@ -159,7 +159,7 @@ OBJS-$(CONFIG_RTP_MUXER) += rtp.o \
rtp_aac.o \
rtpenc_h264.o \
avc.o
OBJS-$(CONFIG_RTSP_DEMUXER) += rtsp.o
OBJS-$(CONFIG_RTSP_DEMUXER) += rdt.o rtsp.o
OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o rtp.o rtpdec.o rtp_h264.o
OBJS-$(CONFIG_SEGAFILM_DEMUXER) += segafilm.o
OBJS-$(CONFIG_SHORTEN_DEMUXER) += raw.o

73
libavformat/rdt.c Normal file
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@ -0,0 +1,73 @@
/*
* Realmedia RTSP protocol (RDT) support.
* Copyright (c) 2007 Ronald S. Bultje
*
* 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 rdt.c
* @brief Realmedia RTSP protocol (RDT) support
* @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
*/
#include "avformat.h"
#include "libavutil/avstring.h"
#include "rdt.h"
#include "libavutil/base64.h"
#include "libavutil/md5.h"
#include "rm.h"
#include "internal.h"
void
ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
const char *challenge)
{
int ch_len = strlen (challenge), i;
unsigned char zres[16],
buf[64] = { 0xa1, 0xe9, 0x14, 0x9d, 0x0e, 0x6b, 0x3b, 0x59 };
#define XOR_TABLE_SIZE 37
const unsigned char xor_table[XOR_TABLE_SIZE] = {
0x05, 0x18, 0x74, 0xd0, 0x0d, 0x09, 0x02, 0x53,
0xc0, 0x01, 0x05, 0x05, 0x67, 0x03, 0x19, 0x70,
0x08, 0x27, 0x66, 0x10, 0x10, 0x72, 0x08, 0x09,
0x63, 0x11, 0x03, 0x71, 0x08, 0x08, 0x70, 0x02,
0x10, 0x57, 0x05, 0x18, 0x54 };
/* some (length) checks */
if (ch_len == 40) /* what a hack... */
ch_len = 32;
else if (ch_len > 56)
ch_len = 56;
memcpy(buf + 8, challenge, ch_len);
/* xor challenge bytewise with xor_table */
for (i = 0; i < XOR_TABLE_SIZE; i++)
buf[8 + i] ^= xor_table[i];
av_md5_sum(zres, buf, 64);
ff_data_to_hex(response, zres, 16);
for (i=0;i<32;i++) response[i] = tolower(response[i]);
/* add tail */
strcpy (response + 32, "01d0a8e3");
/* calculate checksum */
for (i = 0; i < 8; i++)
chksum[i] = response[i * 4];
chksum[8] = 0;
}

40
libavformat/rdt.h Normal file
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@ -0,0 +1,40 @@
/*
* Realmedia RTSP (RDT) definitions
* Copyright (c) 2007 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
*
* 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
*/
#ifndef AVFORMAT_RDT_H
#define AVFORMAT_RDT_H
/**
* Calculate the response (RealChallenge2 in the RTSP header) to the
* challenge (RealChallenge1 in the RTSP header from the Real/Helix
* server), which is used as some sort of client validation.
*
* @param response pointer to response buffer, it should be at least 41 bytes
* (40 data + 1 zero) bytes long.
* @param chksum pointer to buffer containing a checksum of the response,
* it should be at least 9 (8 data + 1 zero) bytes long.
* @param challenge pointer to the RealChallenge1 value provided by the
* server.
*/
void ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
const char *challenge);
#endif /* AVFORMAT_RDT_H */

35
libavformat/rtsp.c
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@ -32,6 +32,7 @@
#include "rtsp.h"
#include "rtp_internal.h"
#include "rdt.h"
//#define DEBUG
//#define DEBUG_RTP_TCP
@ -870,7 +871,8 @@ static void rtsp_close_streams(RTSPState *rt)
* @returns 0 on success, <0 on error, 1 if protocol is unavailable.
*/
static int
make_setup_request (AVFormatContext *s, const char *host, int port, int protocol)
make_setup_request (AVFormatContext *s, const char *host, int port,
int protocol, const char *real_challenge)
{
RTSPState *rt = s->priv_data;
int j, i, err;
@ -878,6 +880,12 @@ make_setup_request (AVFormatContext *s, const char *host, int port, int protocol
AVStream *st;
RTSPHeader reply1, *reply = &reply1;
char cmd[2048];
const char *trans_pref;
if (rt->server_type == RTSP_SERVER_RDT)
trans_pref = "x-pn-tng";
else
trans_pref = "RTP/AVP";
/* for each stream, make the setup request */
/* XXX: we assume the same server is used for the control of each
@ -918,8 +926,10 @@ make_setup_request (AVFormatContext *s, const char *host, int port, int protocol
if (transport[0] != '\0')
av_strlcat(transport, ",", sizeof(transport));
snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
"RTP/AVP/UDP;unicast;client_port=%d-%d",
port, port + 1);
"%s/UDP;unicast;client_port=%d",
trans_pref, port);
if (rt->server_type == RTSP_SERVER_RTP)
av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
}
/* RTP/TCP */
@ -927,7 +937,7 @@ make_setup_request (AVFormatContext *s, const char *host, int port, int protocol
if (transport[0] != '\0')
av_strlcat(transport, ",", sizeof(transport));
snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
"RTP/AVP/TCP");
"%s/TCP", trans_pref);
}
else if (protocol == RTSP_PROTOCOL_RTP_UDP_MULTICAST) {
@ -935,12 +945,23 @@ make_setup_request (AVFormatContext *s, const char *host, int port, int protocol
av_strlcat(transport, ",", sizeof(transport));
snprintf(transport + strlen(transport),
sizeof(transport) - strlen(transport) - 1,
"RTP/AVP/UDP;multicast");
"%s/UDP;multicast", trans_pref);
}
if (rt->server_type == RTSP_SERVER_RDT)
av_strlcat(transport, ";mode=play", sizeof(transport));
snprintf(cmd, sizeof(cmd),
"SETUP %s RTSP/1.0\r\n"
"Transport: %s\r\n",
rtsp_st->control_url, transport);
if (i == 0 && rt->server_type == RTSP_SERVER_RDT) {
char real_res[41], real_csum[9];
ff_rdt_calc_response_and_checksum(real_res, real_csum,
real_challenge);
av_strlcatf(cmd, sizeof(cmd),
"If-Match: %s\r\n"
"RealChallenge2: %s, sd=%s\r\n",
rt->session_id, real_res, real_csum);
}
rtsp_send_cmd(s, cmd, reply, NULL);
if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
err = 1;
@ -1155,7 +1176,9 @@ static int rtsp_read_header(AVFormatContext *s,
do {
int protocol = ff_log2_tab[protocol_mask & ~(protocol_mask - 1)];
err = make_setup_request(s, host, port, protocol);
err = make_setup_request(s, host, port, protocol,
rt->server_type == RTSP_SERVER_RDT ?
real_challenge : NULL);
if (err < 0)
goto fail;
protocol_mask &= ~(1 << protocol);