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FFmpeg/libavformat/mmsh.c
Andreas Rheinhardt 82bf41f3ab avformat: Replace ffurl_close() by ffurl_closep() where appropriate 
It avoids leaving dangling pointers behind in memory.

Also remove redundant checks for whether the URLContext to be closed is
already NULL.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-05-25 13:11:36 +02:00

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/*
* MMS protocol over HTTP
* Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
*
* 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
*/
/*
* Reference
* Windows Media HTTP Streaming Protocol.
* http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
*/
#include <string.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "mms.h"
#include "asf.h"
#include "http.h"
#include "url.h"
#define CHUNK_HEADER_LENGTH 4 // 2bytes chunk type and 2bytes chunk length.
#define EXT_HEADER_LENGTH 8 // 4bytes sequence, 2bytes useless and 2bytes chunk length.
// see Ref 2.2.1.8
#define USERAGENT "User-Agent: NSPlayer/4.1.0.3856\r\n"
// see Ref 2.2.1.4.33
// the GUID value can be changed to any valid value.
#define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
// see Ref 2.2.3 for packet type define:
// chunk type contains 2 fields: Frame and PacketID.
// Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
typedef enum {
CHUNK_TYPE_DATA = 0x4424,
CHUNK_TYPE_ASF_HEADER = 0x4824,
CHUNK_TYPE_END = 0x4524,
CHUNK_TYPE_STREAM_CHANGE = 0x4324,
} ChunkType;
typedef struct MMSHContext {
MMSContext mms;
uint8_t location[1024];
int request_seq; ///< request packet sequence
int chunk_seq; ///< data packet sequence
} MMSHContext;
static int mmsh_close(URLContext *h)
{
MMSHContext *mmsh = (MMSHContext *)h->priv_data;
MMSContext *mms = &mmsh->mms;
ffurl_closep(&mms->mms_hd);
av_freep(&mms->streams);
av_freep(&mms->asf_header);
return 0;
}
static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
{
MMSContext *mms = &mmsh->mms;
uint8_t chunk_header[CHUNK_HEADER_LENGTH];
uint8_t ext_header[EXT_HEADER_LENGTH];
ChunkType chunk_type;
int chunk_len, res, ext_header_len;
res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
if (res != CHUNK_HEADER_LENGTH) {
av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
return AVERROR(EIO);
}
chunk_type = AV_RL16(chunk_header);
chunk_len = AV_RL16(chunk_header + 2);
switch (chunk_type) {
case CHUNK_TYPE_END:
case CHUNK_TYPE_STREAM_CHANGE:
ext_header_len = 4;
break;
case CHUNK_TYPE_ASF_HEADER:
case CHUNK_TYPE_DATA:
ext_header_len = 8;
break;
default:
av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
return AVERROR_INVALIDDATA;
}
res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
if (res != ext_header_len) {
av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
return AVERROR(EIO);
}
*len = chunk_len - ext_header_len;
if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
mmsh->chunk_seq = AV_RL32(ext_header);
return chunk_type;
}
static int read_data_packet(MMSHContext *mmsh, const int len)
{
MMSContext *mms = &mmsh->mms;
int res;
if (len > sizeof(mms->in_buffer)) {
av_log(NULL, AV_LOG_ERROR,
"Data packet length %d exceeds the in_buffer size %"SIZE_SPECIFIER"\n",
len, sizeof(mms->in_buffer));
return AVERROR(EIO);
}
res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
av_log(NULL, AV_LOG_TRACE, "Data packet len = %d\n", len);
if (res != len) {
av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
return AVERROR(EIO);
}
if (len > mms->asf_packet_len) {
av_log(NULL, AV_LOG_ERROR,
"Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
return AVERROR_INVALIDDATA;
} else {
memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
}
mms->read_in_ptr = mms->in_buffer;
mms->remaining_in_len = mms->asf_packet_len;
return 0;
}
static int get_http_header_data(MMSHContext *mmsh)
{
MMSContext *mms = &mmsh->mms;
int res, len;
ChunkType chunk_type;
for (;;) {
len = 0;
res = chunk_type = get_chunk_header(mmsh, &len);
if (res < 0) {
return res;
} else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
// get asf header and stored it
if (!mms->header_parsed) {
if (mms->asf_header) {
if (len != mms->asf_header_size) {
mms->asf_header_size = len;
av_log(NULL, AV_LOG_TRACE, "Header len changed from %d to %d\n",
mms->asf_header_size, len);
av_freep(&mms->asf_header);
}
}
mms->asf_header = av_mallocz(len);
if (!mms->asf_header) {
return AVERROR(ENOMEM);
}
mms->asf_header_size = len;
}
if (len > mms->asf_header_size) {
av_log(NULL, AV_LOG_ERROR,
"Asf header packet len = %d exceed the asf header buf size %d\n",
len, mms->asf_header_size);
return AVERROR(EIO);
}
res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
if (res != len) {
av_log(NULL, AV_LOG_ERROR,
"Recv asf header data len %d != expected len %d\n", res, len);
return AVERROR(EIO);
}
mms->asf_header_size = len;
if (!mms->header_parsed) {
res = ff_mms_asf_header_parser(mms);
mms->header_parsed = 1;
return res;
}
} else if (chunk_type == CHUNK_TYPE_DATA) {
// read data packet and do padding
return read_data_packet(mmsh, len);
} else {
if (len) {
if (len > sizeof(mms->in_buffer)) {
av_log(NULL, AV_LOG_ERROR,
"Other packet len = %d exceed the in_buffer size %"SIZE_SPECIFIER"\n",
len, sizeof(mms->in_buffer));
return AVERROR(EIO);
}
res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
if (res != len) {
av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
return AVERROR(EIO);
} else {
av_log(NULL, AV_LOG_TRACE, "Skip chunk type %d \n", chunk_type);
continue;
}
}
}
}
}
static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
{
int i, port, err;
char httpname[256], path[256], host[128];
char *stream_selection = NULL;
char headers[1024];
MMSHContext *mmsh = h->priv_data;
MMSContext *mms;
mmsh->request_seq = h->is_streamed = 1;
mms = &mmsh->mms;
av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
av_url_split(NULL, 0, NULL, 0,
host, sizeof(host), &port, path, sizeof(path), mmsh->location);
if (port<0)
port = 80; // default mmsh protocol port
ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
&h->interrupt_callback) < 0) {
return AVERROR(EIO);
}
snprintf(headers, sizeof(headers),
"Accept: */*\r\n"
USERAGENT
"Host: %s:%d\r\n"
"Pragma: no-cache,rate=1.000000,stream-time=0,"
"stream-offset=0:0,request-context=%u,max-duration=0\r\n"
CLIENTGUID
"Connection: Close\r\n",
host, port, mmsh->request_seq++);
av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
if (!mms->mms_hd->protocol_whitelist && h->protocol_whitelist) {
mms->mms_hd->protocol_whitelist = av_strdup(h->protocol_whitelist);
if (!mms->mms_hd->protocol_whitelist) {
err = AVERROR(ENOMEM);
goto fail;
}
}
err = ffurl_connect(mms->mms_hd, NULL);
if (err) {
goto fail;
}
err = get_http_header_data(mmsh);
if (err) {
av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
goto fail;
}
// close the socket and then reopen it for sending the second play request.
ffurl_closep(&mms->mms_hd);
memset(headers, 0, sizeof(headers));
if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
&h->interrupt_callback)) < 0) {
goto fail;
}
stream_selection = av_mallocz(mms->stream_num * 19 + 1);
if (!stream_selection)
return AVERROR(ENOMEM);
for (i = 0; i < mms->stream_num; i++) {
char tmp[20];
err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
if (err < 0)
goto fail;
av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
}
// send play request
err = snprintf(headers, sizeof(headers),
"Accept: */*\r\n"
USERAGENT
"Host: %s:%d\r\n"
"Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
"Pragma: xPlayStrm=1\r\n"
CLIENTGUID
"Pragma: stream-switch-count=%d\r\n"
"Pragma: stream-switch-entry=%s\r\n"
"Pragma: no-cache,rate=1.000000,stream-time=%u"
"Connection: Close\r\n",
host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
av_freep(&stream_selection);
if (err < 0) {
av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
goto fail;
}
av_log(NULL, AV_LOG_TRACE, "out_buffer is %s", headers);
av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
err = ffurl_connect(mms->mms_hd, NULL);
if (err) {
goto fail;
}
err = get_http_header_data(mmsh);
if (err) {
av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
goto fail;
}
av_log(NULL, AV_LOG_TRACE, "Connection successfully open\n");
return 0;
fail:
av_freep(&stream_selection);
mmsh_close(h);
av_log(NULL, AV_LOG_TRACE, "Connection failed with error %d\n", err);
return err;
}
static int mmsh_open(URLContext *h, const char *uri, int flags)
{
return mmsh_open_internal(h, uri, flags, 0, 0);
}
static int handle_chunk_type(MMSHContext *mmsh)
{
MMSContext *mms = &mmsh->mms;
int res, len = 0;
ChunkType chunk_type;
chunk_type = get_chunk_header(mmsh, &len);
switch (chunk_type) {
case CHUNK_TYPE_END:
mmsh->chunk_seq = 0;
av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
return AVERROR(EIO);
case CHUNK_TYPE_STREAM_CHANGE:
mms->header_parsed = 0;
if (res = get_http_header_data(mmsh)) {
av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
return res;
}
break;
case CHUNK_TYPE_DATA:
return read_data_packet(mmsh, len);
default:
av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
return AVERROR_INVALIDDATA;
}
return 0;
}
static int mmsh_read(URLContext *h, uint8_t *buf, int size)
{
int res = 0;
MMSHContext *mmsh = h->priv_data;
MMSContext *mms = &mmsh->mms;
do {
if (mms->asf_header_read_size < mms->asf_header_size) {
// copy asf header into buffer
res = ff_mms_read_header(mms, buf, size);
} else {
if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
return res;
res = ff_mms_read_data(mms, buf, size);
}
} while (!res);
return res;
}
static int64_t mmsh_read_seek(URLContext *h, int stream_index,
int64_t timestamp, int flags)
{
MMSHContext *mmsh_old = h->priv_data;
MMSHContext *mmsh = av_mallocz(sizeof(*mmsh));
int ret;
if (!mmsh)
return AVERROR(ENOMEM);
h->priv_data = mmsh;
ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0);
if(ret>=0){
h->priv_data = mmsh_old;
mmsh_close(h);
h->priv_data = mmsh;
av_free(mmsh_old);
mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size;
}else {
h->priv_data = mmsh_old;
av_free(mmsh);
}
return ret;
}
static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
{
MMSHContext *mmsh = h->priv_data;
MMSContext *mms = &mmsh->mms;
if(pos == 0 && whence == SEEK_CUR)
return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
return AVERROR(ENOSYS);
}
const URLProtocol ff_mmsh_protocol = {
.name = "mmsh",
.url_open = mmsh_open,
.url_read = mmsh_read,
.url_seek = mmsh_seek,
.url_close = mmsh_close,
.url_read_seek = mmsh_read_seek,
.priv_data_size = sizeof(MMSHContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.default_whitelist = "http,tcp",
};
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