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rtmp: Automatically compute the hash for SWFVerification

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Samuel Pitoiset 2012-08-15 16:11:50 +02:00 committed by Martin Storsjö
parent 635ac8e1be
commit 93f257db6b
3 changed files with 138 additions and 1 deletions
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3
doc/protocols.texi
View File

@ -251,6 +251,9 @@ Size of the decompressed SWF file, required for SWFVerification.
@item rtmp_swfurl
URL of the SWF player for the media. By default no value will be sent.
@item rtmp_swfverify
URL to player swf file, compute hash/size automatically.
@item rtmp_tcurl
URL of the target stream. Defaults to proto://host[:port]/app.

134
libavformat/rtmpproto.c
View File

@ -41,6 +41,10 @@
#include "rtmppkt.h"
#include "url.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif
//#define DEBUG
#define APP_MAX_LENGTH 128
@ -95,6 +99,7 @@ typedef struct RTMPContext {
int swfhash_len; ///< length of the SHA256 hash
int swfsize; ///< size of the decompressed SWF file
char* swfurl; ///< url of the swf player
char* swfverify; ///< URL to player swf file, compute hash/size automatically
char swfverification[42]; ///< hash of the SWF verification
char* pageurl; ///< url of the web page
char* subscribe; ///< name of live stream to subscribe
@ -825,6 +830,129 @@ static int rtmp_calc_swf_verification(URLContext *s, RTMPContext *rt,
return 0;
}
#if CONFIG_ZLIB
static int rtmp_uncompress_swfplayer(uint8_t *in_data, int64_t in_size,
uint8_t **out_data, int64_t *out_size)
{
z_stream zs = { 0 };
void *ptr;
int size;
int ret = 0;
zs.avail_in = in_size;
zs.next_in = in_data;
ret = inflateInit(&zs);
if (ret != Z_OK)
return AVERROR_UNKNOWN;
do {
uint8_t tmp_buf[16384];
zs.avail_out = sizeof(tmp_buf);
zs.next_out = tmp_buf;
ret = inflate(&zs, Z_NO_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END) {
ret = AVERROR_UNKNOWN;
goto fail;
}
size = sizeof(tmp_buf) - zs.avail_out;
if (!(ptr = av_realloc(*out_data, *out_size + size))) {
ret = AVERROR(ENOMEM);
goto fail;
}
*out_data = ptr;
memcpy(*out_data + *out_size, tmp_buf, size);
*out_size += size;
} while (zs.avail_out == 0);
fail:
inflateEnd(&zs);
return ret;
}
#endif
static int rtmp_calc_swfhash(URLContext *s)
{
RTMPContext *rt = s->priv_data;
uint8_t *in_data = NULL, *out_data = NULL, *swfdata;
int64_t in_size, out_size;
URLContext *stream;
char swfhash[32];
int swfsize;
int ret = 0;
/* Get the SWF player file. */
if ((ret = ffurl_open(&stream, rt->swfverify, AVIO_FLAG_READ,
&s->interrupt_callback, NULL)) < 0) {
av_log(s, AV_LOG_ERROR, "Cannot open connection %s.\n", rt->swfverify);
goto fail;
}
if ((in_size = ffurl_seek(stream, 0, AVSEEK_SIZE)) < 0) {
ret = AVERROR(EIO);
goto fail;
}
if (!(in_data = av_malloc(in_size))) {
ret = AVERROR(ENOMEM);
goto fail;
}
if ((ret = ffurl_read_complete(stream, in_data, in_size)) < 0)
goto fail;
if (in_size < 3) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (!memcmp(in_data, "CWS", 3)) {
/* Decompress the SWF player file using Zlib. */
if (!(out_data = av_malloc(8))) {
ret = AVERROR(ENOMEM);
goto fail;
}
*in_data = 'F'; // magic stuff
memcpy(out_data, in_data, 8);
out_size = 8;
#if CONFIG_ZLIB
if ((ret = rtmp_uncompress_swfplayer(in_data + 8, in_size - 8,
&out_data, &out_size)) < 0)
goto fail;
#else
av_log(s, AV_LOG_ERROR,
"Zlib is required for decompressing the SWF player file.\n");
ret = AVERROR(EINVAL);
goto fail;
#endif
swfsize = out_size;
swfdata = out_data;
} else {
swfsize = in_size;
swfdata = in_data;
}
/* Compute the SHA256 hash of the SWF player file. */
if ((ret = ff_rtmp_calc_digest(swfdata, swfsize, 0,
"Genuine Adobe Flash Player 001", 30,
swfhash)) < 0)
goto fail;
/* Set SWFVerification parameters. */
av_opt_set_bin(rt, "rtmp_swfhash", swfhash, 32, 0);
rt->swfsize = swfsize;
fail:
av_freep(&in_data);
av_freep(&out_data);
ffurl_close(stream);
return ret;
}
/**
* Perform handshake with the server by means of exchanging pseudorandom data
* signed with HMAC-SHA2 digest.
@ -1492,6 +1620,11 @@ static int rtmp_open(URLContext *s, const char *uri, int flags)
goto fail;
}
if (rt->swfverify) {
if ((ret = rtmp_calc_swfhash(s)) < 0)
goto fail;
}
rt->state = STATE_START;
if ((ret = rtmp_handshake(s, rt)) < 0)
goto fail;
@ -1784,6 +1917,7 @@ static const AVOption rtmp_options[] = {
{"rtmp_swfhash", "SHA256 hash of the decompressed SWF file (32 bytes).", OFFSET(swfhash), AV_OPT_TYPE_BINARY, .flags = DEC},
{"rtmp_swfsize", "Size of the decompressed SWF file, required for SWFVerification.", OFFSET(swfsize), AV_OPT_TYPE_INT, {0}, 0, INT_MAX, DEC},
{"rtmp_swfurl", "URL of the SWF player. By default no value will be sent", OFFSET(swfurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
{"rtmp_swfverify", "URL to player swf file, compute hash/size automatically.", OFFSET(swfverify), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
{"rtmp_tcurl", "URL of the target stream. Defaults to proto://host[:port]/app.", OFFSET(tcurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
{ NULL },
};

2
libavformat/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 54
#define LIBAVFORMAT_VERSION_MINOR 13
#define LIBAVFORMAT_VERSION_MICRO 3
#define LIBAVFORMAT_VERSION_MICRO 4
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \