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|
/* packet-rtmpt.c
* Routines for Real Time Messaging Protocol packet dissection
* metatech <metatech@flashmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* This dissector is called RTMPT to avoid a conflict with
* the other RTMP protocol (Routing Table Maintenance Protocol) implemented in packet-atalk.c
* (RTMPT normally stands for RTMP-Tunnel via http)
*
* RTMP in a nutshell
*
* The protocol has very few "magic words" to facilitate detection,
* but rather has "magic lengths".
* This protocol has plenty of special cases and few general rules,
* especially regarding the lengths and the structures.
*
* Documentation:
* RTMP protocol description on Wiki of Red5 Open Source Flash Server at
*
* http://trac.red5.org/wiki/Codecs/RTMPSpecification
*
* and the pages to which it links:
*
* http://osflash.org/documentation/rtmp
* http://wiki.gnashdev.org/RTMP
* http://wiki.gnashdev.org/RTMP_Messages_Decoded
* http://www.acmewebworks.com/Downloads/openCS/TheAMF.pdf
* https://rtmp.veriskope.com/pdf/rtmp_specification_1.0.pdf
*
* It's also available from Adobe at
*
* https://www.adobe.com/devnet/rtmp.html
*
* For AMF, see:
*
* http://download.macromedia.com/pub/labs/amf/amf0_spec_121207.pdf
*
* for AMF0 and
*
* http://amf3cplusplus.googlecode.com/svn-history/r4/trunk/doc/amf3_spec_05_05_08.pdf
*
* for AMF3.
*
* For FLV, see:
*
* https://rtmp.veriskope.com/pdf/video_file_format_spec_v10.pdf
*
* For Enhanced RTMP, see:
*
* https://veovera.org/docs/enhanced/enhanced-rtmp-v2.pdf
*
* Default TCP port is 1935
*/
#include "config.h"
#define WS_LOG_DOMAIN "RTMPT"
#include <epan/packet.h>
#include <wsutil/pint.h>
#include <epan/prefs.h>
#include <epan/to_str.h>
#include <epan/expert.h>
#include "packet-tcp.h"
#define MAX_AMF_ITERATIONS 1000
void proto_register_rtmpt(void);
void proto_reg_handoff_rtmpt(void);
void proto_register_amf(void);
static int proto_rtmpt;
static int hf_rtmpt_handshake_c0;
static int hf_rtmpt_handshake_s0;
static int hf_rtmpt_handshake_c1;
static int hf_rtmpt_handshake_s1;
static int hf_rtmpt_handshake_c2;
static int hf_rtmpt_handshake_s2;
static int hf_rtmpt_header_format;
static int hf_rtmpt_header_csid;
static int hf_rtmpt_header_timestamp;
static int hf_rtmpt_header_timestamp_delta;
static int hf_rtmpt_header_body_size;
static int hf_rtmpt_header_typeid;
static int hf_rtmpt_header_streamid;
static int hf_rtmpt_header_ets;
static int hf_rtmpt_scm_chunksize;
static int hf_rtmpt_scm_csid;
static int hf_rtmpt_scm_seq;
static int hf_rtmpt_scm_was;
static int hf_rtmpt_scm_limittype;
static int hf_rtmpt_ucm_eventtype;
static int hf_rtmpt_function_call;
static int hf_rtmpt_function_response;
static int hf_rtmpt_audio_control;
static int hf_rtmpt_audio_multitrack_control;
static int hf_rtmpt_audio_is_ex_header;
static int hf_rtmpt_audio_format;
static int hf_rtmpt_audio_rate;
static int hf_rtmpt_audio_size;
static int hf_rtmpt_audio_type;
static int hf_rtmpt_audio_packet_type;
static int hf_rtmpt_audio_multitrack_type;
static int hf_rtmpt_audio_multitrack_packet_type;
static int hf_rtmpt_audio_fourcc;
static int hf_rtmpt_audio_track_id;
static int hf_rtmpt_audio_track_length;
static int hf_rtmpt_audio_data;
static int hf_rtmpt_video_control;
static int hf_rtmpt_video_multitrack_control;
static int hf_rtmpt_video_is_ex_header;
static int hf_rtmpt_video_type;
static int hf_rtmpt_video_command;
static int hf_rtmpt_video_format;
static int hf_rtmpt_video_packet_type;
static int hf_rtmpt_video_multitrack_type;
static int hf_rtmpt_video_multitrack_packet_type;
static int hf_rtmpt_video_fourcc;
static int hf_rtmpt_video_track_id;
static int hf_rtmpt_video_track_length;
static int hf_rtmpt_video_data;
static int hf_rtmpt_tag_type;
static int hf_rtmpt_tag_datasize;
static int hf_rtmpt_tag_timestamp;
static int hf_rtmpt_tag_ets;
static int hf_rtmpt_tag_streamid;
static int hf_rtmpt_tag_tagsize;
static expert_field ei_amf_loop;
static int ett_rtmpt;
static int ett_rtmpt_handshake;
static int ett_rtmpt_header;
static int ett_rtmpt_body;
static int ett_rtmpt_ucm;
static int ett_rtmpt_audio_control;
static int ett_rtmpt_video_control;
static int ett_rtmpt_audio_multitrack_control;
static int ett_rtmpt_audio_multitrack_track;
static int ett_rtmpt_video_multitrack_control;
static int ett_rtmpt_video_multitrack_track;
static int ett_rtmpt_tag;
static int ett_rtmpt_tag_data;
static dissector_handle_t amf_handle;
static dissector_handle_t rtmpt_tcp_handle;
static dissector_handle_t rtmpt_http_handle;
static bool rtmpt_desegment = true;
/* Native Bandwidth Detection (using the checkBandwidth(), onBWCheck(),
* onBWDone() calls) transmits a series of increasing size packets over
* the course of 2 seconds. On a fast link the largest packet can just
* exceed 256KB, but setting the limit there can cause massive memory
* usage, especially with fuzzed packets where the length value is bogus.
* Limit the initial allocation size and realloc if needed, i.e., in
* future frames if the bytes are actually there.
* This initial max allocation size can be reduced further if need be,
* but keep it at least 18 so that the headers fit without checking,
* See https://gitlab.com/wireshark/wireshark/-/issues/6898
*/
#define RTMPT_INIT_ALLOC_SIZE 32768
#define RTMP_PORT 1935 /* Not IANA registered */
#define RTMPT_MAGIC 0x03
#define RTMPT_HANDSHAKE_OFFSET_1 1
#define RTMPT_HANDSHAKE_OFFSET_2 1538
#define RTMPT_HANDSHAKE_OFFSET_3 3074
#define RTMPT_HANDSHAKE_LENGTH_1 1537
#define RTMPT_HANDSHAKE_LENGTH_2 3073
#define RTMPT_HANDSHAKE_LENGTH_3 1536
#define RTMPT_INITIAL_CHUNK_SIZE 128
static unsigned rtmpt_default_chunk_size = 128;
#define RTMPT_ID_MAX 65599
#define RTMPT_TYPE_HANDSHAKE_1 0x100001
#define RTMPT_TYPE_HANDSHAKE_2 0x100002
#define RTMPT_TYPE_HANDSHAKE_3 0x100003
#define RTMPT_TYPE_CHUNK_SIZE 0x01
#define RTMPT_TYPE_ABORT_MESSAGE 0x02
#define RTMPT_TYPE_ACKNOWLEDGEMENT 0x03
#define RTMPT_TYPE_UCM 0x04
#define RTMPT_TYPE_WINDOW 0x05
#define RTMPT_TYPE_PEER_BANDWIDTH 0x06
#define RTMPT_TYPE_AUDIO_DATA 0x08
#define RTMPT_TYPE_VIDEO_DATA 0x09
#define RTMPT_TYPE_DATA_AMF3 0x0F
#define RTMPT_TYPE_SHARED_AMF3 0x10
#define RTMPT_TYPE_COMMAND_AMF3 0x11
#define RTMPT_TYPE_DATA_AMF0 0x12
#define RTMPT_TYPE_SHARED_AMF0 0x13
#define RTMPT_TYPE_COMMAND_AMF0 0x14
#define RTMPT_TYPE_AGGREGATE 0x16
#define RTMPT_UCM_STREAM_BEGIN 0x00
#define RTMPT_UCM_STREAM_EOF 0x01
#define RTMPT_UCM_STREAM_DRY 0x02
#define RTMPT_UCM_SET_BUFFER 0x03
#define RTMPT_UCM_STREAM_ISRECORDED 0x04
#define RTMPT_UCM_PING_REQUEST 0x06
#define RTMPT_UCM_PING_RESPONSE 0x07
#define RTMPT_IS_EX_AUDIO_HEADER 0x90
#define RTMPT_IS_EX_VIDEO_HEADER 0x80
#define RTMPT_IS_PACKET_TYPE_METADATA 0x04
#define RTMPT_IS_FRAME_TYPE_COMMAND 0x05
#define RTMPT_IS_AUDIO_MULTITRACK 0x05
#define RTMPT_IS_VIDEO_MULTITRACK 0x06
#define RTMPT_IS_ONETRACK 0x00
#define RTMPT_IS_MANYTRACKSMANYCODECS 0x02
#define RTMPT_TEXT_RTMP_HEADER "RTMP Header"
#define RTMPT_TEXT_RTMP_BODY "RTMP Body"
static const value_string rtmpt_handshake_vals[] = {
{ RTMPT_TYPE_HANDSHAKE_1, "Handshake C0+C1" },
{ RTMPT_TYPE_HANDSHAKE_2, "Handshake S0+S1+S2" },
{ RTMPT_TYPE_HANDSHAKE_3, "Handshake C2" },
{ 0, NULL }
};
static const value_string rtmpt_opcode_vals[] = {
{ RTMPT_TYPE_CHUNK_SIZE, "Set Chunk Size" },
{ RTMPT_TYPE_ABORT_MESSAGE, "Abort Message" },
{ RTMPT_TYPE_ACKNOWLEDGEMENT, "Acknowledgement" },
{ RTMPT_TYPE_UCM, "User Control Message" },
{ RTMPT_TYPE_WINDOW, "Window Acknowledgement Size" },
{ RTMPT_TYPE_PEER_BANDWIDTH, "Set Peer Bandwidth" },
{ RTMPT_TYPE_AUDIO_DATA, "Audio Data" },
{ RTMPT_TYPE_VIDEO_DATA, "Video Data" },
{ RTMPT_TYPE_DATA_AMF3, "AMF3 Data" },
{ RTMPT_TYPE_SHARED_AMF3, "AMF3 Shared Object" },
{ RTMPT_TYPE_COMMAND_AMF3, "AMF3 Command" },
{ RTMPT_TYPE_DATA_AMF0, "AMF0 Data" },
{ RTMPT_TYPE_SHARED_AMF0, "AMF0 Shared Object" },
{ RTMPT_TYPE_COMMAND_AMF0, "AMF0 Command" },
{ RTMPT_TYPE_AGGREGATE, "Aggregate" },
{ 0, NULL }
};
static const value_string rtmpt_limit_vals[] = {
/* These are a complete guess, from the order of the documented
* options - the values aren't actually specified */
{ 0, "Hard" },
{ 1, "Soft" },
{ 2, "Dynamic" },
{ 0, NULL }
};
static const value_string rtmpt_ucm_vals[] = {
{ RTMPT_UCM_STREAM_BEGIN, "Stream Begin" },
{ RTMPT_UCM_STREAM_EOF, "Stream EOF" },
{ RTMPT_UCM_STREAM_DRY, "Stream Dry" },
{ RTMPT_UCM_SET_BUFFER, "Set Buffer Length" },
{ RTMPT_UCM_STREAM_ISRECORDED, "Stream Is Recorded" },
{ RTMPT_UCM_PING_REQUEST, "Ping Request" },
{ RTMPT_UCM_PING_RESPONSE, "Ping Response" },
{ 0, NULL }
};
static const value_string rtmpt_tag_vals[] = {
{ RTMPT_TYPE_AUDIO_DATA, "Audio Tag" },
{ RTMPT_TYPE_VIDEO_DATA, "Video Tag" },
{ RTMPT_TYPE_DATA_AMF0, "Script Tag" },
{ 0, NULL }
};
/* [Spec] https://github.com/runner365/read_book/blob/master/rtmp/rtmp_specification_1.0.pdf */
/* [DevG] http://help.adobe.com/en_US/flashmediaserver/devguide/index.html "working with Live Video" => Adding metadata to a live stream */
/* [SWF] https://github.com/blackears/raven/blob/master/proj/SWFParser/doc/swf_file_format_spec_v10.pdf */
static const value_string rtmpt_audio_codecs[] = {
{ 0, "Uncompressed" }, /* [DevG] */
{ 1, "ADPCM" }, /* [DevG] */
{ 2, "MP3" }, /* [DevG] */
{ 3, "Uncompressed, little-endian"}, /* [SWF] */
{ 4, "Nellymoser 16kHz" }, /* [SWF] */
{ 5, "Nellymoser 8kHz" }, /* [DevG] [SWF]*/
{ 6, "Nellymoser" }, /* [DevG] [SWF]*/
{ 7, "G711A" }, /* [Spec] */
{ 8, "G711U" }, /* [Spec] */
{ 9, "Nellymoser 16kHz" }, /* [Spec] */
{ 10, "HE-AAC" }, /* [DevG] */
{ 11, "SPEEX" }, /* [DevG] */
{ 0, NULL }
};
static const value_string rtmpt_audio_packet_types[] = {
{ 0, "PacketTypeSequenceStart" },
{ 1, "PacketTypeCodedFrames" },
{ 4, "PacketTypeMultichannelConfig" },
{ 5, "PacketTypeMultitrack" },
{ 0, NULL }
};
static const value_string rtmpt_av_multitrack_types[] = {
{ 0, "AvMultitrackTypeOneTrack" },
{ 1, "AvMultitrackTypeManyTracks" },
{ 2, "AvMultitrackTypeManyTracksManyCodecs" },
{ 0, NULL }
};
static const value_string rtmpt_audio_rates[] = {
{ 0, "5.5 kHz" },
{ 1, "11 kHz" },
{ 2, "22 kHz" },
{ 3, "44 kHz" },
{ 0, NULL }
};
static const value_string rtmpt_audio_sizes[] = {
{ 0, "8 bit" },
{ 1, "16 bit" },
{ 0, NULL }
};
static const value_string rtmpt_audio_types[] = {
{ 0, "mono" },
{ 1, "stereo" },
{ 0, NULL }
};
/* from FLV v10.1 section E.4.3.1 */
static const value_string rtmpt_video_types[] = {
{ 1, "keyframe" },
{ 2, "inter-frame" },
{ 3, "disposable inter-frame" },
{ 4, "generated key frame" },
{ 5, "video info/command frame" },
{ 0, NULL }
};
/* From Enhanced RTMP */
static const value_string rtmpt_video_commands[] = {
{ 0, "StartSeek" },
{ 1, "EndSeek" },
{ 0, NULL }
};
/* from FLV v10.1 section E.4.3.1 */
static const value_string rtmpt_video_codecs[] = {
{ 2, "Sorensen H.263" },
{ 3, "Screen video" },
{ 4, "On2 VP6" },
{ 5, "On2 VP6+alpha" },
{ 6, "Screen video version 2" },
{ 7, "H.264" },
{ 12, "H.265" },
{ 0, NULL }
};
/*
* https://raw.githubusercontent.com/veovera/enhanced-rtmp/main/enhanced-rtmp.pdf
*/
static const value_string rtmpt_video_packet_types[] = {
{ 0, "PacketTypeSequenceStart" },
{ 1, "PacketTypeCodedFrames" },
{ 2, "PacketTypeSequenceEnd" },
{ 3, "PacketTypeCodedFramesX" },
{ 4, "PacketTypeMetadata" },
{ 5, "PacketTypeMPEG2TSSequenceStart" },
{ 6, "PacketTypeMultitrack" },
{ 0, NULL }
};
static int proto_amf;
static int hf_amf_version;
static int hf_amf_header_count;
static int hf_amf_header_name;
static int hf_amf_header_must_understand;
static int hf_amf_header_length;
/* static int hf_amf_header_value_type; */
static int hf_amf_message_count;
static int hf_amf_message_target_uri;
static int hf_amf_message_response_uri;
static int hf_amf_message_length;
static int hf_amf_amf0_type;
static int hf_amf_amf3_type;
static int hf_amf_number;
static int hf_amf_integer;
static int hf_amf_boolean;
static int hf_amf_stringlength;
static int hf_amf_string;
static int hf_amf_string_reference;
static int hf_amf_object_reference;
static int hf_amf_date;
/* static int hf_amf_longstringlength; */
static int hf_amf_longstring;
static int hf_amf_xml_doc;
static int hf_amf_xmllength;
static int hf_amf_xml;
static int hf_amf_int64;
static int hf_amf_bytearraylength;
static int hf_amf_bytearray;
static int hf_amf_object;
static int hf_amf_traitcount;
static int hf_amf_classnamelength;
static int hf_amf_classname;
static int hf_amf_membernamelength;
static int hf_amf_membername;
static int hf_amf_trait_reference;
static int hf_amf_ecmaarray;
static int hf_amf_strictarray;
static int hf_amf_array;
static int hf_amf_arraylength;
static int hf_amf_arraydenselength;
static int hf_amf_end_of_object_marker;
static int hf_amf_end_of_associative_part;
static int hf_amf_end_of_dynamic_members;
static int ett_amf;
static int ett_amf_headers;
static int ett_amf_messages;
static int ett_amf_value;
static int ett_amf_property;
static int ett_amf_string;
static int ett_amf_array_element;
static int ett_amf_traits;
static int ett_amf_trait_member;
/* AMF0 type markers */
#define AMF0_NUMBER 0x00
#define AMF0_BOOLEAN 0x01
#define AMF0_STRING 0x02
#define AMF0_OBJECT 0x03
#define AMF0_MOVIECLIP 0x04
#define AMF0_NULL 0x05
#define AMF0_UNDEFINED 0x06
#define AMF0_REFERENCE 0x07
#define AMF0_ECMA_ARRAY 0x08
#define AMF0_END_OF_OBJECT 0x09
#define AMF0_STRICT_ARRAY 0x0A
#define AMF0_DATE 0x0B
#define AMF0_LONG_STRING 0x0C
#define AMF0_UNSUPPORTED 0x0D
#define AMF0_RECORDSET 0x0E
#define AMF0_XML 0x0F
#define AMF0_TYPED_OBJECT 0x10
#define AMF0_AMF3_MARKER 0x11
#define AMF0_INT64 0x22
/* AMF3 type markers */
#define AMF3_UNDEFINED 0x00
#define AMF3_NULL 0x01
#define AMF3_FALSE 0x02
#define AMF3_TRUE 0x03
#define AMF3_INTEGER 0x04
#define AMF3_DOUBLE 0x05
#define AMF3_STRING 0x06
#define AMF3_XML_DOC 0x07
#define AMF3_DATE 0x08
#define AMF3_ARRAY 0x09
#define AMF3_OBJECT 0x0A
#define AMF3_XML 0x0B
#define AMF3_BYTEARRAY 0x0C
static const value_string amf0_type_vals[] = {
{ AMF0_NUMBER, "Number" },
{ AMF0_BOOLEAN, "Boolean" },
{ AMF0_STRING, "String" },
{ AMF0_OBJECT, "Object" },
{ AMF0_MOVIECLIP, "Movie clip" },
{ AMF0_NULL, "Null" },
{ AMF0_UNDEFINED, "Undefined" },
{ AMF0_REFERENCE, "Reference" },
{ AMF0_ECMA_ARRAY, "ECMA array" },
{ AMF0_END_OF_OBJECT, "End of object" },
{ AMF0_STRICT_ARRAY, "Strict array" },
{ AMF0_DATE, "Date" },
{ AMF0_LONG_STRING, "Long string" },
{ AMF0_UNSUPPORTED, "Unsupported" },
{ AMF0_RECORDSET, "Record set" },
{ AMF0_XML, "XML" },
{ AMF0_TYPED_OBJECT, "Typed object" },
{ AMF0_AMF3_MARKER, "Switch to AMF3" },
{ AMF0_INT64, "Int64" },
{ 0, NULL }
};
static const value_string amf3_type_vals[] = {
{ AMF3_UNDEFINED, "Undefined" },
{ AMF3_NULL, "Null" },
{ AMF3_FALSE, "False" },
{ AMF3_TRUE, "True" },
{ AMF3_INTEGER, "Integer" },
{ AMF3_DOUBLE, "Double" },
{ AMF3_STRING, "String" },
{ AMF3_XML_DOC, "XML document" },
{ AMF3_DATE, "Date" },
{ AMF3_ARRAY, "Array" },
{ AMF3_OBJECT, "Object" },
{ AMF3_XML, "XML" },
{ AMF3_BYTEARRAY, "ByteArray" },
{ 0, NULL }
};
/* Holds the reassembled data for a packet during un-chunking
*/
/* XXX: Because we don't use the TCP dissector's built-in desegmentation,
* or the standard reassembly API, we don't get FT_FRAMENUM links for
* chunk fragments, and we don't mark depended upon frames for export.
* Ideally we'd use the standard API (mark pinfo->desegment_offset and
* pinfo->desegment_len for TCP, or use the reassembly API), or call
* mark_frame_as_depended_upon and add the FT_FRAMENUM fields ourselves.
* To do the latter, we should have a data structure indicating which
* frames contributed to the packet.
*/
typedef struct rtmpt_packet {
uint32_t seq;
uint32_t lastseq;
int resident;
union {
uint8_t *p;
uint32_t offset;
} data;
wmem_list_t *frames;
/* used during unchunking */
int alloc;
int want;
int have;
int chunkwant;
int chunkhave;
uint8_t bhlen;
uint8_t mhlen;
/* Chunk Basic Header */
uint8_t fmt; /* byte 0 */
uint32_t id; /* byte 0 */
/* Chunk Message Header (offsets assume bhlen == 1) */
uint32_t ts; /* bytes 1-3, or from ETS @ mhlen-4 if -1 */
uint32_t len; /* bytes 4-6 */
uint8_t cmd; /* byte 7 */
uint32_t src; /* bytes 8-11 */
uint32_t txid;
int isresponse;
int otherframe;
} rtmpt_packet_t;
/* Represents a header or a chunk that is split over two TCP
* segments
*/
typedef struct rtmpt_frag {
int ishdr;
uint32_t seq;
uint32_t lastseq;
int have;
int len;
union {
uint8_t d[18]; /* enough for a complete header (3 + 11 + 4) */
uint32_t id;
} saved;
} rtmpt_frag_t;
/* The full message header information for the last packet on a particular
* ID - used for defaulting short headers
*/
typedef struct rtmpt_id {
uint32_t ts; /* bytes 1-3 */
uint32_t tsd;
uint32_t len; /* bytes 4-6 */
uint32_t src; /* bytes 8-11 */
uint8_t cmd; /* byte 7 */
wmem_tree_t *packets;
} rtmpt_id_t;
/* Historical view of a whole TCP connection
*/
typedef struct rtmpt_conv {
wmem_tree_t *seqs[2];
wmem_tree_t *frags[2];
wmem_tree_t *ids[2];
wmem_tree_t *packets[2];
wmem_tree_t *chunksize[2];
wmem_tree_t *txids[2];
} rtmpt_conv_t;
static void
rtmpt_packet_mark_depended(void *data, void *user_data)
{
frame_data *fd = (frame_data *)user_data;
uint32_t frame_num = GPOINTER_TO_UINT(data);
mark_frame_as_depended_upon(fd, frame_num);
}
/* Header length helpers */
static int rtmpt_basic_header_length(int id)
{
switch (id & 0x3f) {
case 0: return 2;
case 1: return 3;
default: return 1;
}
}
static int rtmpt_message_header_length(int id)
{
switch ((id>>6) & 3) {
case 0: return 11;
case 1: return 7;
case 2: return 3;
default: return 0;
}
}
/* Lightweight access to AMF0 blobs - more complete dissection is done
* in dissect_rtmpt_body_command */
static uint32_t
rtmpt_get_amf_length(tvbuff_t *tvb, int offset, proto_item* pi)
{
uint8_t iObjType;
int remain = tvb_reported_length_remaining(tvb, offset);
uint32_t depth = 0;
uint32_t itemlen = 0;
uint32_t rv = 0;
unsigned iterations = MAX_AMF_ITERATIONS;
while (rv == 0 || depth > 0) {
if (--iterations == 0) {
expert_add_info(NULL, pi, &ei_amf_loop);
return 0;
}
if (depth > 0) {
if (remain-rv < 2)
return remain;
itemlen = tvb_get_ntohs(tvb, offset+rv) + 2;
if (remain-rv<itemlen+1)
return remain;
rv += itemlen;
}
if (remain-rv < 1)
return remain;
iObjType = tvb_get_uint8(tvb, offset+rv);
if (depth > 0 && itemlen == 2 && iObjType == AMF0_END_OF_OBJECT) {
rv++;
depth--;
continue;
}
switch (iObjType) {
case AMF0_NUMBER:
itemlen = 9;
break;
case AMF0_BOOLEAN:
itemlen = 2;
break;
case AMF0_STRING:
if (remain-rv < 3)
return remain;
itemlen = tvb_get_ntohs(tvb, offset+rv+1) + 3;
break;
case AMF0_NULL:
case AMF0_UNDEFINED:
case AMF0_UNSUPPORTED:
itemlen = 1;
break;
case AMF0_DATE:
itemlen = 11;
break;
case AMF0_LONG_STRING:
case AMF0_XML:
if (remain-rv < 5)
return remain;
itemlen = tvb_get_ntohl(tvb, offset+rv+1) + 5;
break;
case AMF0_INT64:
itemlen = 9;
break;
case AMF0_OBJECT:
itemlen = 1;
depth++;
break;
case AMF0_ECMA_ARRAY:
itemlen = 5;
depth++;
break;
default:
return remain;
}
if (remain-rv < itemlen)
return remain;
rv += itemlen;
}
return rv;
}
static char *
rtmpt_get_amf_param(tvbuff_t *tvb, int offset, proto_item* pi, int param, const char *prop)
{
uint32_t remain = tvb_reported_length_remaining(tvb, offset);
uint32_t itemlen;
uint32_t iStringLength;
while (remain > 0 && param > 0) {
itemlen = rtmpt_get_amf_length(tvb, offset, pi);
if (itemlen == 0)
break;
offset += itemlen;
remain -= itemlen;
param--;
}
if (remain > 0 && param == 0) {
uint8_t iObjType = tvb_get_uint8(tvb, offset);
if (!prop && iObjType == AMF0_STRING && remain >= 3) {
iStringLength = tvb_get_ntohs(tvb, offset+1);
if (remain >= iStringLength+3) {
return tvb_get_string_enc(wmem_packet_scope(), tvb, offset+3, iStringLength, ENC_ASCII);
}
}
if (prop && iObjType == AMF0_OBJECT) {
offset++;
remain--;
while (remain > 2) {
uint32_t iPropLength = tvb_get_ntohs(tvb, offset);
if (remain < 2+iPropLength+3)
break;
if (tvb_strneql(tvb, offset+2, prop, strlen(prop)) == 0) {
if (tvb_get_uint8(tvb, offset+2+iPropLength) != AMF0_STRING)
break;
iStringLength = tvb_get_ntohs(tvb, offset+2+iPropLength+1);
if (remain < 2+iPropLength+3+iStringLength)
break;
return tvb_get_string_enc(wmem_packet_scope(), tvb, offset+2+iPropLength+3, iStringLength, ENC_ASCII);
}
itemlen = rtmpt_get_amf_length(tvb, offset+2+iPropLength, pi);
if (itemlen == 0)
break;
offset += 2+iPropLength+itemlen;
remain -= 2+iPropLength+itemlen;
}
}
}
return NULL;
}
static uint32_t
rtmpt_get_amf_txid(tvbuff_t *tvb, int offset, proto_item* pi)
{
uint32_t remain = tvb_reported_length_remaining(tvb, offset);
if (remain > 0) {
uint32_t itemlen = rtmpt_get_amf_length(tvb, offset, pi);
if (itemlen == 0 || remain < itemlen)
return 0;
offset += itemlen;
remain -= itemlen;
}
if (remain >= 9) {
uint8_t iObjType = tvb_get_uint8(tvb, offset);
if (iObjType == AMF0_NUMBER) {
return (uint32_t)tvb_get_ntohieee_double(tvb, offset+1);
}
}
return 0;
}
/* Generate a useful description for various packet types */
static char *
rtmpt_get_packet_desc(tvbuff_t *tvb, uint32_t offset, proto_item* pi, uint32_t remain, rtmpt_conv_t *rconv, int cdir,
rtmpt_packet_t *tp, bool *deschasopcode)
{
if (tp->cmd == RTMPT_TYPE_CHUNK_SIZE || tp->cmd == RTMPT_TYPE_ABORT_MESSAGE ||
tp->cmd == RTMPT_TYPE_ACKNOWLEDGEMENT || tp->cmd == RTMPT_TYPE_WINDOW) {
if (tp->len >= 4 && remain >= 4) {
*deschasopcode = true;
return wmem_strdup_printf(wmem_packet_scope(), "%s %d",
val_to_str(tp->cmd, rtmpt_opcode_vals, "Unknown (0x%01x)"),
tvb_get_ntohl(tvb, offset));
}
} else if (tp->cmd == RTMPT_TYPE_PEER_BANDWIDTH) {
if (tp->len >= 5 && remain >= 5) {
*deschasopcode = true;
return wmem_strdup_printf(wmem_packet_scope(), "%s %d,%s",
val_to_str(tp->cmd, rtmpt_opcode_vals, "Unknown (0x%01x)"),
tvb_get_ntohl(tvb, offset),
val_to_str(tvb_get_uint8(tvb, offset+4), rtmpt_limit_vals, "Unknown (%d)"));
}
} else if (tp->cmd == RTMPT_TYPE_UCM) {
uint16_t iUCM = -1;
const char *sFunc;
const char *sParam = "";
if (tp->len < 2 || remain < 2)
return NULL;
iUCM = tvb_get_ntohs(tvb, offset);
sFunc = try_val_to_str(iUCM, rtmpt_ucm_vals);
if (sFunc == NULL) {
*deschasopcode = true;
sFunc = wmem_strdup_printf(wmem_packet_scope(), "User Control Message 0x%01x", iUCM);
}
if (iUCM == RTMPT_UCM_STREAM_BEGIN || iUCM == RTMPT_UCM_STREAM_EOF ||
iUCM == RTMPT_UCM_STREAM_DRY || iUCM == RTMPT_UCM_STREAM_ISRECORDED) {
if (tp->len >= 6 && remain >= 6) {
sParam = wmem_strdup_printf(wmem_packet_scope(), " %d", tvb_get_ntohl(tvb, offset+2));
}
} else if (iUCM == RTMPT_UCM_SET_BUFFER) {
if (tp->len >= 10 && remain >= 10) {
sParam = wmem_strdup_printf(wmem_packet_scope(), " %d,%dms",
tvb_get_ntohl(tvb, offset+2),
tvb_get_ntohl(tvb, offset+6));
}
}
return wmem_strdup_printf(wmem_packet_scope(), "%s%s", sFunc, sParam);
} else if (tp->cmd == RTMPT_TYPE_COMMAND_AMF0 || tp->cmd == RTMPT_TYPE_COMMAND_AMF3 ||
tp->cmd == RTMPT_TYPE_DATA_AMF0 || tp->cmd == RTMPT_TYPE_DATA_AMF3) {
uint32_t slen = 0;
uint32_t soff = 0;
char *sFunc = NULL;
char *sParam = NULL;
if (tp->cmd == RTMPT_TYPE_COMMAND_AMF3 || tp->cmd == RTMPT_TYPE_DATA_AMF3) {
soff = 1;
}
if (tp->len >= 3+soff && remain >= 3+soff) {
slen = tvb_get_ntohs(tvb, offset+1+soff);
}
if (slen > 0) {
sFunc = tvb_get_string_enc(wmem_packet_scope(), tvb, offset+3+soff, slen, ENC_ASCII);
ws_debug("got function call '%s'", sFunc);
if (strcmp(sFunc, "connect") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 2, "app");
} else if (strcmp(sFunc, "play") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, NULL);
} else if (strcmp(sFunc, "play2") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, "streamName");
} else if (strcmp(sFunc, "releaseStream") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, NULL);
} else if (strcmp(sFunc, "FCPublish") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, NULL);
} else if (strcmp(sFunc, "publish") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, NULL);
} else if (strcmp(sFunc, "onStatus") == 0) {
if (tp->cmd == RTMPT_TYPE_COMMAND_AMF0 || tp->cmd == RTMPT_TYPE_COMMAND_AMF3) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, "code");
} else {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 1, "code");
}
} else if (strcmp(sFunc, "onPlayStatus") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 1, "code");
} else if (strcmp(sFunc, "_result") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, "code");
tp->isresponse = true;
} else if (strcmp(sFunc, "_error") == 0) {
sParam = rtmpt_get_amf_param(tvb, offset+soff, pi, 3, "code");
tp->isresponse = true;
}
if (tp->txid != 0 && tp->otherframe == 0) {
tp->otherframe = GPOINTER_TO_INT(wmem_tree_lookup32(rconv->txids[cdir^1], tp->txid));
if (tp->otherframe) {
ws_debug("got otherframe=%d", tp->otherframe);
}
}
}
if (sFunc) {
if (sParam) {
return wmem_strdup_printf(wmem_packet_scope(), "%s('%s')", sFunc, sParam);
} else {
return wmem_strdup_printf(wmem_packet_scope(), "%s()", sFunc);
}
}
}
return NULL;
}
/* Tree dissection helpers for various packet body forms */
static void
dissect_rtmpt_body_scm(tvbuff_t *tvb, int offset, proto_tree *rtmpt_tree, unsigned scm)
{
switch (scm) {
case RTMPT_TYPE_CHUNK_SIZE:
proto_tree_add_item(rtmpt_tree, hf_rtmpt_scm_chunksize, tvb, offset, 4, ENC_BIG_ENDIAN);
break;
case RTMPT_TYPE_ABORT_MESSAGE:
proto_tree_add_item(rtmpt_tree, hf_rtmpt_scm_csid, tvb, offset, 4, ENC_BIG_ENDIAN);
break;
case RTMPT_TYPE_ACKNOWLEDGEMENT:
proto_tree_add_item(rtmpt_tree, hf_rtmpt_scm_seq, tvb, offset, 4, ENC_BIG_ENDIAN);
break;
case RTMPT_TYPE_UCM:
proto_tree_add_item(rtmpt_tree, hf_rtmpt_ucm_eventtype, tvb, offset, 2, ENC_BIG_ENDIAN);
break;
case RTMPT_TYPE_WINDOW:
proto_tree_add_item(rtmpt_tree, hf_rtmpt_scm_was, tvb, offset, 4, ENC_BIG_ENDIAN);
break;
case RTMPT_TYPE_PEER_BANDWIDTH:
proto_tree_add_item(rtmpt_tree, hf_rtmpt_scm_was, tvb, offset, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(rtmpt_tree, hf_rtmpt_scm_limittype, tvb, offset+4, 1, ENC_BIG_ENDIAN);
break;
}
}
static int
dissect_amf0_value_type(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, bool *amf3_encoding, proto_item *parent_ti);
/*
* A "property list" is a sequence of name/value pairs, terminated by
* and "end of object" indicator. AMF0 "object"s and "ECMA array"s
* are encoded as property lists.
*/
static int
// NOLINTNEXTLINE(misc-no-recursion)
dissect_amf0_property_list(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, unsigned *countp, bool *amf3_encoding)
{
proto_item *prop_ti;
proto_tree *prop_tree;
proto_tree *name_tree;
unsigned iStringLength;
char *iStringValue;
unsigned count = 0;
/*
* XXX - at least as I read "3.1 AVM+ Type Marker" in the AMF0
* specification, the AVM+ Type Marker only affects "the following
* Object". For now, we have a single "AMF3 encoding" flag, and
* set it when we see the type marker, and never clear it.
*/
for (;;) {
/* UTF-8: property name */
iStringLength = tvb_get_ntohs(tvb, offset);
if (iStringLength == 0 &&
tvb_get_uint8(tvb, offset + 2) == AMF0_END_OF_OBJECT)
break;
count++;
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, offset + 2, iStringLength, ENC_ASCII);
prop_tree = proto_tree_add_subtree_format(tree, tvb, offset, -1,
ett_amf_property, &prop_ti, "Property '%s'",
iStringValue);
name_tree = proto_tree_add_subtree_format(prop_tree, tvb,
offset, 2+iStringLength,
ett_amf_string, NULL, "Name: %s", iStringValue);
proto_tree_add_uint(name_tree, hf_amf_stringlength, tvb, offset, 2, iStringLength);
offset += 2;
proto_tree_add_item(name_tree, hf_amf_string, tvb, offset, iStringLength, ENC_UTF_8);
offset += iStringLength;
/* value-type: property value */
offset = dissect_amf0_value_type(tvb, pinfo, offset, prop_tree, amf3_encoding, prop_ti);
proto_item_set_end(prop_ti, tvb, offset);
}
proto_tree_add_item(tree, hf_amf_end_of_object_marker, tvb, offset, 3, ENC_NA);
offset += 3;
*countp = count;
return offset;
}
static int
// NOLINTNEXTLINE(misc-no-recursion)
dissect_amf0_value_type(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, bool *amf3_encoding, proto_item *parent_ti)
{
uint8_t iObjType;
proto_item *ti;
proto_tree *val_tree;
int iValueOffset = offset;
uint32_t iIntegerValue;
double iDoubleValue;
bool iBooleanValue;
unsigned iStringLength;
char *iStringValue;
unsigned iArrayLength;
unsigned i;
nstime_t t;
int64_t iInteger64Value;
unsigned count;
iObjType = tvb_get_uint8(tvb, offset);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " %s",
val_to_str_const(iObjType, amf0_type_vals, "Unknown"));
switch (iObjType) {
case AMF0_OBJECT:
/*
* For object types, make the top-level protocol tree
* item a field for that type.
*/
ti = proto_tree_add_item(tree, hf_amf_object, tvb, offset, -1, ENC_NA);
val_tree = proto_item_add_subtree(ti, ett_amf_value);
break;
case AMF0_ECMA_ARRAY:
/*
* For ECMA array types, make the top-level protocol tree
* item a field for that type.
*/
ti = proto_tree_add_item(tree, hf_amf_ecmaarray, tvb, offset, -1, ENC_NA);
val_tree = proto_item_add_subtree(ti, ett_amf_value);
break;
case AMF0_STRICT_ARRAY:
/*
* For strict array types, make the top-level protocol tree
* item a field for that type.
*/
ti = proto_tree_add_item(tree, hf_amf_strictarray, tvb, offset, -1, ENC_NA);
val_tree = proto_item_add_subtree(ti, ett_amf_value);
break;
default:
/*
* For all other types, make it just a text item; the
* field for that type will be used for the value.
*/
val_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_amf_value, &ti,
val_to_str_const(iObjType, amf0_type_vals, "Unknown"));
break;
}
proto_tree_add_uint(val_tree, hf_amf_amf0_type, tvb, iValueOffset, 1, iObjType);
iValueOffset++;
increment_dissection_depth(pinfo);
switch (iObjType) {
case AMF0_NUMBER:
iDoubleValue = tvb_get_ntohieee_double(tvb, iValueOffset);
proto_tree_add_double(val_tree, hf_amf_number, tvb, iValueOffset, 8, iDoubleValue);
iValueOffset += 8;
proto_item_append_text(ti, " %." G_STRINGIFY(DBL_DIG) "g", iDoubleValue);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " %." G_STRINGIFY(DBL_DIG) "g", iDoubleValue);
break;
case AMF0_BOOLEAN:
iBooleanValue = tvb_get_uint8(tvb, iValueOffset);
proto_tree_add_boolean(val_tree, hf_amf_boolean, tvb, iValueOffset, 1, iBooleanValue);
iValueOffset += 1;
proto_item_append_text(ti, iBooleanValue ? " true" : " false");
if (parent_ti != NULL)
proto_item_append_text(parent_ti, iBooleanValue ? " true" : " false");
break;
case AMF0_STRING:
iStringLength = tvb_get_ntohs(tvb, iValueOffset);
proto_tree_add_uint(val_tree, hf_amf_stringlength, tvb, iValueOffset, 2, iStringLength);
iValueOffset += 2;
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset, iStringLength, ENC_UTF_8|ENC_NA);
if (iStringLength != 0)
proto_tree_add_string(val_tree, hf_amf_string, tvb, iValueOffset, iStringLength, iStringValue);
iValueOffset += iStringLength;
proto_item_append_text(ti, " '%s'", iStringValue);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " '%s'", iStringValue);
break;
case AMF0_OBJECT:
iValueOffset = dissect_amf0_property_list(tvb, pinfo, iValueOffset, val_tree, &count, amf3_encoding);
proto_item_append_text(ti, " (%u items)", count);
break;
case AMF0_NULL:
case AMF0_UNDEFINED:
break;
case AMF0_REFERENCE:
iIntegerValue = tvb_get_ntohs(tvb, iValueOffset);
proto_tree_add_uint(val_tree, hf_amf_object_reference, tvb, iValueOffset, 2, iIntegerValue);
iValueOffset += 2;
proto_item_append_text(ti, " %d", iIntegerValue);
break;
case AMF0_ECMA_ARRAY:
/*
* Counted list type, with end marker. The count appears to be
* more of a hint than a rule, and is sometimes sent as 0 or
* invalid.
*
* Basically the same as OBJECT but with the extra count field.
* There being many strange encoders/metadata injectors out
* there, sometimes you see a valid count and no end marker.
* Figuring out which you've got for a deeply nested structure
* is non-trivial.
*/
iArrayLength = tvb_get_ntohl(tvb, iValueOffset);
proto_tree_add_uint(val_tree, hf_amf_arraylength, tvb, iValueOffset, 4, iArrayLength);
iValueOffset += 4;
iValueOffset = dissect_amf0_property_list(tvb, pinfo, iValueOffset, val_tree, &count, amf3_encoding);
proto_item_append_text(ti, " (%u items)", count);
break;
case AMF0_END_OF_OBJECT:
proto_tree_add_item(tree, hf_amf_end_of_object_marker, tvb, iValueOffset, 3, ENC_NA);
iValueOffset += 3;
break;
case AMF0_STRICT_ARRAY:
/*
* Counted list type, without end marker. Number of values
* is determined by count, values are assumed to form a
* [0..N-1] numbered array and are presented as plain AMF
* types, not OBJECT or ECMA_ARRAY style named properties.
*/
iArrayLength = tvb_get_ntohl(tvb, iValueOffset);
proto_tree_add_uint(val_tree, hf_amf_arraylength, tvb, iValueOffset, 4, iArrayLength);
iValueOffset += 4;
for (i = 0; i < iArrayLength; i++)
iValueOffset = dissect_amf0_value_type(tvb, pinfo, iValueOffset, val_tree, amf3_encoding, NULL);
proto_item_append_text(ti, " (%u items)", iArrayLength);
break;
case AMF0_DATE:
iDoubleValue = tvb_get_ntohieee_double(tvb, iValueOffset);
t.secs = (time_t)(iDoubleValue/1000);
t.nsecs = (int)((iDoubleValue - 1000*(double)t.secs) * 1000000);
proto_tree_add_time(val_tree, hf_amf_date, tvb, iValueOffset, 8, &t);
iValueOffset += 8;
proto_item_append_text(ti, " %s", abs_time_to_str(pinfo->pool, &t, ABSOLUTE_TIME_LOCAL, true));
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " %s", abs_time_to_str(pinfo->pool, &t, ABSOLUTE_TIME_LOCAL, true));
/* time-zone */
iValueOffset += 2;
break;
case AMF0_LONG_STRING:
case AMF0_XML: /* same representation */
iStringLength = tvb_get_ntohl(tvb, iValueOffset);
proto_tree_add_uint(val_tree, hf_amf_stringlength, tvb, iValueOffset, 2, iStringLength);
iValueOffset += 4;
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset, iStringLength, ENC_UTF_8|ENC_NA);
if (iStringLength != 0)
proto_tree_add_string(val_tree, (iObjType == AMF0_XML) ? hf_amf_xml_doc : hf_amf_longstring, tvb, iValueOffset, iStringLength, iStringValue);
iValueOffset += iStringLength;
proto_item_append_text(ti, " '%s'", iStringValue);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " '%s'", iStringValue);
break;
case AMF0_UNSUPPORTED:
break;
case AMF0_TYPED_OBJECT:
/* class-name */
iStringLength = tvb_get_ntohs(tvb, iValueOffset);
proto_tree_add_uint(val_tree, hf_amf_stringlength, tvb, iValueOffset, 2, iStringLength);
iValueOffset += 2;
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset, iStringLength, ENC_UTF_8|ENC_NA);
proto_tree_add_string(val_tree, hf_amf_string, tvb, iValueOffset, iStringLength, iStringValue);
iValueOffset += iStringLength;
iValueOffset = dissect_amf0_property_list(tvb, pinfo, iValueOffset, val_tree, &count, amf3_encoding);
break;
case AMF0_AMF3_MARKER:
*amf3_encoding = true;
break;
case AMF0_INT64:
iInteger64Value = tvb_get_ntoh64(tvb, iValueOffset);
proto_tree_add_int64(val_tree, hf_amf_int64, tvb, iValueOffset, 8, iInteger64Value);
iValueOffset += 8;
proto_item_append_text(ti," %" PRId64, iInteger64Value);
if (parent_ti != NULL)
proto_item_append_text(parent_ti," %" PRId64, iInteger64Value);
break;
default:
/*
* If we can't determine the length, don't carry on;
* just skip to the end of the tvbuff.
*/
iValueOffset = tvb_reported_length(tvb);
break;
}
decrement_dissection_depth(pinfo);
proto_item_set_end(ti, tvb, iValueOffset);
return iValueOffset;
}
static uint32_t
amf_get_u29(tvbuff_t *tvb, int offset, unsigned *lenp)
{
unsigned len = 0;
uint8_t iByte;
uint32_t iValue;
iByte = tvb_get_uint8(tvb, offset);
iValue = (iByte & 0x7F);
offset++;
len++;
if (!(iByte & 0x80)) {
/* 1 byte value */
*lenp = len;
return iValue;
}
iByte = tvb_get_uint8(tvb, offset);
iValue = (iValue << 7) | (iByte & 0x7F);
offset++;
len++;
if (!(iByte & 0x80)) {
/* 2 byte value */
*lenp = len;
return iValue;
}
iByte = tvb_get_uint8(tvb, offset);
iValue = (iValue << 7) | (iByte & 0x7F);
offset++;
len++;
if (!(iByte & 0x80)) {
/* 3 byte value */
*lenp = len;
return iValue;
}
iByte = tvb_get_uint8(tvb, offset);
iValue = (iValue << 8) | iByte;
len++;
*lenp = len;
return iValue;
}
static int
// NOLINTNEXTLINE(misc-no-recursion)
dissect_amf3_value_type(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, proto_item *parent_ti)
{
uint8_t iObjType;
proto_item *ti;
proto_tree *val_tree;
int iValueOffset = offset;
unsigned iValueLength;
uint32_t iIntegerValue;
double iDoubleValue;
unsigned iStringLength;
char *iStringValue;
unsigned iArrayLength;
proto_item *subval_ti;
proto_tree *subval_tree;
unsigned i;
bool iTypeIsDynamic;
unsigned iTraitCount;
proto_item *traits_ti;
proto_tree *traits_tree;
proto_tree *name_tree;
proto_tree *member_tree;
uint8_t *iByteArrayValue;
iObjType = tvb_get_uint8(tvb, offset);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " %s",
val_to_str_const(iObjType, amf3_type_vals, "Unknown"));
switch (iObjType) {
case AMF3_ARRAY:
/*
* For array types, make the top-level protocol tree
* item a field for that type.
*/
ti = proto_tree_add_item(tree, hf_amf_array, tvb, offset, -1, ENC_NA);
val_tree = proto_item_add_subtree(ti, ett_amf_value);
break;
case AMF3_OBJECT:
/*
* For object types, make the top-level protocol tree
* item a field for that type.
*/
ti = proto_tree_add_item(tree, hf_amf_object, tvb, offset, -1, ENC_NA);
val_tree = proto_item_add_subtree(ti, ett_amf_value);
break;
default:
/*
* For all other types, make it just a text item; the
* field for that type will be used for the value.
*/
val_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_amf_value, &ti,
val_to_str_const(iObjType, amf3_type_vals, "Unknown"));
break;
}
proto_tree_add_uint(val_tree, hf_amf_amf3_type, tvb, iValueOffset, 1, iObjType);
iValueOffset++;
increment_dissection_depth(pinfo);
switch (iObjType) {
case AMF3_UNDEFINED:
case AMF3_NULL:
break;
case AMF3_FALSE:
proto_tree_add_boolean(val_tree, hf_amf_boolean, tvb, 0, 0, false);
proto_item_append_text(ti, " false");
break;
case AMF3_TRUE:
proto_tree_add_boolean(val_tree, hf_amf_boolean, tvb, 0, 0, true);
proto_item_append_text(ti, " true");
break;
case AMF3_INTEGER:
/* XXX - signed or unsigned? */
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
proto_tree_add_uint(val_tree, hf_amf_integer, tvb, iValueOffset, iValueLength, iIntegerValue);
proto_item_append_text(ti, " %u", iIntegerValue);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " %u", iIntegerValue);
iValueOffset += iValueLength;
break;
case AMF3_DOUBLE:
iDoubleValue = tvb_get_ntohieee_double(tvb, iValueOffset);
proto_tree_add_double(val_tree, hf_amf_number, tvb, iValueOffset, 8, iDoubleValue);
iValueOffset += 8;
proto_item_append_text(ti, " %." G_STRINGIFY(DBL_DIG) "g", iDoubleValue);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " %." G_STRINGIFY(DBL_DIG) "g", iDoubleValue);
break;
case AMF3_STRING:
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/* the upper 28 bits of the integer value is a string length */
iStringLength = iIntegerValue >> 1;
proto_tree_add_uint(val_tree, hf_amf_stringlength, tvb, iValueOffset, iValueLength, iStringLength);
iValueOffset += iValueLength;
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset, iStringLength, ENC_UTF_8|ENC_NA);
if (iStringLength != 0)
proto_tree_add_string(val_tree, hf_amf_string, tvb, iValueOffset, iStringLength, iStringValue);
iValueOffset += iStringLength;
proto_item_append_text(ti, " '%s'", iStringValue);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " '%s'", iStringValue);
} else {
/* the upper 28 bits of the integer value are a string reference index */
proto_tree_add_uint(val_tree, hf_amf_string_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
iValueOffset += iValueLength;
proto_item_append_text(ti, " reference %u", iIntegerValue >> 1);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " reference %u", iIntegerValue >> 1);
}
break;
case AMF3_DATE:
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/*
* The upper 28 bits of the integer value are
* ignored; what follows is a double
* containing milliseconds since the Epoch.
*/
nstime_t t;
iValueOffset += iValueLength;
iDoubleValue = tvb_get_ntohieee_double(tvb, iValueOffset);
t.secs = (time_t)(iDoubleValue/1000);
t.nsecs = (int)((iDoubleValue - 1000*(double)t.secs) * 1000000);
proto_tree_add_time(val_tree, hf_amf_date, tvb, iValueOffset, 8, &t);
iValueOffset += 8;
proto_item_append_text(ti, "%s", abs_time_to_str(pinfo->pool, &t, ABSOLUTE_TIME_LOCAL, true));
if (parent_ti != NULL)
proto_item_append_text(parent_ti, "%s", abs_time_to_str(pinfo->pool, &t, ABSOLUTE_TIME_LOCAL, true));
} else {
/* the upper 28 bits of the integer value are an object reference index */
proto_tree_add_uint(val_tree, hf_amf_object_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
iValueOffset += iValueLength;
proto_item_append_text(ti, " object reference %u", iIntegerValue >> 1);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " object reference %u", iIntegerValue >> 1);
}
break;
case AMF3_ARRAY:
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/*
* The upper 28 bits of the integer value are
* a count of the number of elements in
* the dense portion of the array.
*/
iArrayLength = iIntegerValue >> 1;
proto_tree_add_uint(val_tree, hf_amf_arraydenselength, tvb, iValueOffset, iValueLength, iArrayLength);
iValueOffset += iValueLength;
/*
* The AMF3 spec bit on the Array type is slightly
* confusingly written, but seems to be saying that
* the associative portion of the array follows the
* size of the dense portion of the array, and the
* dense portion of the array follows the associative
* portion.
*
* Dissect the associative portion.
*/
for (;;) {
/* Fetch the name */
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/* the upper 28 bits of the integer value is a string length */
iStringLength = iIntegerValue >> 1;
if (iStringLength == 0) {
/* null name marks the end of the associative part */
proto_tree_add_item(val_tree, hf_amf_end_of_associative_part, tvb, iValueOffset, iValueLength, ENC_NA);
iValueOffset += iValueLength;
break;
}
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset+iValueLength, iStringLength, ENC_UTF_8|ENC_NA);
subval_tree = proto_tree_add_subtree(val_tree, tvb, iValueOffset, iStringLength,
ett_amf_array_element, &subval_ti, iStringValue);
proto_tree_add_uint(subval_tree, hf_amf_stringlength, tvb, iValueOffset, iValueLength, iStringLength);
iValueOffset += iValueLength;
proto_tree_add_string(subval_tree, hf_amf_string, tvb, iValueOffset, iStringLength, iStringValue);
} else {
/* the upper 28 bits of the integer value are a string reference index */
subval_tree = proto_tree_add_subtree_format(val_tree, tvb, iValueOffset, iValueLength,
ett_amf_array_element, &subval_ti, "Reference %u:", iIntegerValue >> 1);
proto_tree_add_uint(subval_tree, hf_amf_string_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
}
/* Fetch the value */
iObjType = tvb_get_uint8(tvb, offset);
proto_item_append_text(subval_ti, "%s",
val_to_str_const(iObjType, amf3_type_vals, "Unknown"));
iValueOffset = dissect_amf3_value_type(tvb, pinfo, iValueOffset, subval_tree, subval_ti);
}
/*
* Dissect the dense portion.
*/
for (i = 0; i < iArrayLength; i++)
iValueOffset = dissect_amf3_value_type(tvb, pinfo, iValueOffset, val_tree, NULL);
proto_item_set_end(ti, tvb, iValueOffset);
} else {
/* the upper 28 bits of the integer value are an object reference index */
proto_tree_add_uint(val_tree, hf_amf_object_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
proto_item_append_text(ti, " reference %u", iIntegerValue >> 1);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " reference %u", iIntegerValue >> 1);
}
break;
case AMF3_OBJECT:
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
if (iIntegerValue & 0x00000002) {
if (iIntegerValue & 0x00000004) {
/*
* U29O-traits-ext; the rest of
* iIntegerValue is not significant,
* and, worse, we have idea what
* follows the class name, or even
* how many bytes follow the class
* name - that's by convention between
* the client and server.
*/
iValueOffset += iValueLength;
} else {
/*
* U29O-traits; the 0x00000008 bit
* specifies whether the type is
* dynamic.
*/
iTypeIsDynamic = (iIntegerValue & 0x00000008) ? true : false;
iTraitCount = iIntegerValue >> 4;
proto_tree_add_uint(val_tree, hf_amf_traitcount, tvb, iValueOffset, iValueLength, iTraitCount);
iValueOffset += iValueLength;
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/* the upper 28 bits of the integer value is a string length */
iStringLength = iIntegerValue >> 1;
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset+iValueLength, iStringLength, ENC_UTF_8|ENC_NA);
traits_tree = proto_tree_add_subtree_format(val_tree, tvb, iValueOffset, -1,
ett_amf_traits, &traits_ti, "Traits for class %s (%u member names)", iStringValue, iTraitCount);
name_tree = proto_tree_add_subtree_format(traits_tree, tvb,
iValueOffset,
iValueLength+iStringLength,
ett_amf_string, NULL, "Class name: %s",
iStringValue);
proto_tree_add_uint(name_tree, hf_amf_classnamelength, tvb, iValueOffset, iValueLength, iStringLength);
iValueOffset += iValueLength;
proto_tree_add_string(name_tree, hf_amf_classname, tvb, iValueOffset, iStringLength, iStringValue);
iValueOffset += iStringLength;
} else {
/* the upper 28 bits of the integer value are a string reference index */
traits_tree = proto_tree_add_subtree_format(val_tree, tvb, iValueOffset, iValueLength,
ett_amf_traits, &traits_ti, "Traits for class (reference %u for name)", iIntegerValue >> 1);
proto_tree_add_uint(traits_tree, hf_amf_string_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
iValueOffset += iValueLength;
}
for (i = 0; i < iTraitCount; i++) {
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/* the upper 28 bits of the integer value is a string length */
iStringLength = iIntegerValue >> 1;
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset+iValueLength, iStringLength, ENC_UTF_8|ENC_NA);
member_tree = proto_tree_add_subtree_format(traits_tree, tvb, iValueOffset, iValueLength+iStringLength,
ett_amf_trait_member, NULL, "Member '%s'", iStringValue);
proto_tree_add_uint(member_tree, hf_amf_membernamelength, tvb, iValueOffset, iValueLength, iStringLength);
iValueOffset += iValueLength;
proto_tree_add_string(member_tree, hf_amf_membername, tvb, iValueOffset, iStringLength, iStringValue);
iValueOffset += iStringLength;
} else {
/* the upper 28 bits of the integer value are a string reference index */
proto_tree_add_uint(traits_tree, hf_amf_string_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
iValueOffset += iValueLength;
}
}
for (i = 0; i < iTraitCount; i++)
iValueOffset = dissect_amf3_value_type(tvb, pinfo, iValueOffset, traits_tree, NULL);
if (iTypeIsDynamic) {
for (;;) {
/* Fetch the name */
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/* the upper 28 bits of the integer value is a string length */
iStringLength = iIntegerValue >> 1;
if (iStringLength == 0) {
/* null name marks the end of the associative part */
proto_tree_add_item(traits_tree, hf_amf_end_of_dynamic_members, tvb, iValueOffset, iValueLength, ENC_NA);
iValueOffset += iValueLength;
break;
}
iStringValue = tvb_get_string_enc(pinfo->pool, tvb, iValueOffset+iValueLength, iStringLength, ENC_UTF_8|ENC_NA);
subval_tree = proto_tree_add_subtree_format(traits_tree, tvb, iValueOffset, -1,
ett_amf_array_element, &subval_ti, "%s:", iStringValue);
name_tree = proto_tree_add_subtree_format(subval_tree, tvb,
iValueOffset,
iValueLength+iStringLength,
ett_amf_string, NULL, "Member name: %s",
iStringValue);
proto_tree_add_uint(name_tree, hf_amf_membernamelength, tvb, iValueOffset, iValueLength, iStringLength);
iValueOffset += iValueLength;
proto_tree_add_string(name_tree, hf_amf_membername, tvb, iValueOffset, iStringLength, iStringValue);
iValueOffset += iStringLength;
} else {
/* the upper 28 bits of the integer value are a string reference index */
subval_tree = proto_tree_add_subtree_format(traits_tree, tvb, iValueOffset, iValueLength,
ett_amf_array_element, &subval_ti, "Reference %u:", iIntegerValue >> 1);
proto_tree_add_uint(subval_tree, hf_amf_string_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
iValueOffset += iValueLength;
}
/* Fetch the value */
iValueOffset = dissect_amf3_value_type(tvb, pinfo, iValueOffset, subval_tree, subval_ti);
proto_item_set_end(subval_ti, tvb, iValueOffset);
}
}
proto_item_set_end(traits_ti, tvb, iValueOffset);
}
} else {
/*
* U29O-traits-ref; the upper 27 bits of
* the integer value are a traits reference
* index.
*/
proto_tree_add_uint(val_tree, hf_amf_trait_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 2);
iValueOffset += iValueLength;
}
} else {
/*
* U29O-ref; the upper 28 bits of the integer value
* are an object reference index.
*/
proto_tree_add_uint(val_tree, hf_amf_object_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
proto_item_append_text(ti, " reference %u", iIntegerValue >> 1);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " reference %u", iIntegerValue >> 1);
}
break;
case AMF3_XML:
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/*
* The upper 28 bits of the integer value are
* a count of the number of bytes in the
* XML string.
*/
iStringLength = iIntegerValue >> 1;
proto_tree_add_uint(val_tree, hf_amf_xmllength, tvb, iValueOffset, iValueLength, iStringLength);
iValueOffset += iValueLength;
proto_tree_add_item(val_tree, hf_amf_xml, tvb, iValueOffset, iStringLength, ENC_UTF_8);
} else {
/* the upper 28 bits of the integer value are a string reference index */
proto_tree_add_uint(val_tree, hf_amf_object_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
proto_item_append_text(ti, " reference %u", iIntegerValue >> 1);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " reference %u", iIntegerValue >> 1);
}
break;
case AMF3_BYTEARRAY:
iIntegerValue = amf_get_u29(tvb, iValueOffset, &iValueLength);
if (iIntegerValue & 0x00000001) {
/*
* The upper 28 bits of the integer value are
* a count of the number of bytes in the
* byte array.
*/
iArrayLength = iIntegerValue >> 1;
proto_tree_add_uint(val_tree, hf_amf_bytearraylength, tvb, iValueOffset, iValueLength, iArrayLength);
iValueOffset += iValueLength;
iByteArrayValue = (uint8_t *)tvb_memdup(pinfo->pool, tvb, iValueOffset, iArrayLength);
proto_tree_add_bytes(val_tree, hf_amf_bytearray, tvb, iValueOffset, iArrayLength, iByteArrayValue);
proto_item_append_text(ti, " %s", bytes_to_str(pinfo->pool, iByteArrayValue, iArrayLength));
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " %s", bytes_to_str(pinfo->pool, iByteArrayValue, iArrayLength));
} else {
/* the upper 28 bits of the integer value are a object reference index */
proto_tree_add_uint(val_tree, hf_amf_object_reference, tvb, iValueOffset, iValueLength, iIntegerValue >> 1);
proto_item_append_text(ti, " reference %u", iIntegerValue >> 1);
if (parent_ti != NULL)
proto_item_append_text(parent_ti, " reference %u", iIntegerValue >> 1);
}
break;
default:
/*
* If we can't determine the length, don't carry on;
* just skip to the end of the tvbuff.
*/
iValueOffset = tvb_reported_length(tvb);
break;
}
decrement_dissection_depth(pinfo);
proto_item_set_end(ti, tvb, iValueOffset);
return iValueOffset;
}
static int
dissect_rtmpt_body_command(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *rtmpt_tree, bool amf3)
{
bool amf3_encoding = false;
if (amf3) {
/* Looks like for the AMF3 variants we get a 0 byte here,
* followed by AMF0 encoding - I've never seen actual AMF3
* encoding used, which is completely different. I speculate
* that if the byte is AMF0_AMF3_MARKER then the rest
* will be in AMF3. For now, assume AMF0 only. */
offset++;
}
while (tvb_reported_length_remaining(tvb, offset) > 0)
{
if (amf3_encoding)
offset = dissect_amf3_value_type(tvb, pinfo, offset, rtmpt_tree, NULL);
else
offset = dissect_amf0_value_type(tvb, pinfo, offset, rtmpt_tree, &amf3_encoding, NULL);
}
return offset;
}
static void
dissect_rtmpt_body_audio(tvbuff_t *tvb, int offset, proto_tree *rtmpt_tree)
{
uint8_t iCtl;
uint8_t iAudioMultitrackCtl;
uint8_t iAudioTrackId;
uint32_t iAudioTrackLength;
proto_item *ai;
proto_tree *at;
bool isAudioMultitrack = false;
bool isOneTrack = false;
bool isManyTracksManyCodecs = false;
bool processAudioBody = true;
iCtl = tvb_get_uint8(tvb, offset);
if ((iCtl & RTMPT_IS_EX_AUDIO_HEADER) == RTMPT_IS_EX_AUDIO_HEADER) {
ai = proto_tree_add_uint_format(rtmpt_tree, hf_rtmpt_audio_packet_type, tvb, offset, 1, iCtl,
"Control: 0x%02x (%s)", iCtl,
val_to_str_const((iCtl & 0xf), rtmpt_audio_packet_types, "Reserved audio packet type"));
at = proto_item_add_subtree(ai, ett_rtmpt_audio_control);
proto_tree_add_uint(at, hf_rtmpt_audio_is_ex_header, tvb, offset, 1, iCtl);
proto_tree_add_uint(at, hf_rtmpt_audio_packet_type, tvb, offset, 1, iCtl);
offset += 1;
isAudioMultitrack = (iCtl & 0xf) == RTMPT_IS_AUDIO_MULTITRACK;
if (isAudioMultitrack) {
iAudioMultitrackCtl = tvb_get_uint8(tvb, offset);
ai = proto_tree_add_uint_format(rtmpt_tree, hf_rtmpt_audio_multitrack_control, tvb, offset, 1, iAudioMultitrackCtl,
"Audio Multitrack Control: 0x%02x (%s %s)", iAudioMultitrackCtl,
val_to_str_const((iAudioMultitrackCtl & 0x0f), rtmpt_av_multitrack_types, "Reserved av multitrack type"),
val_to_str_const((iAudioMultitrackCtl & 0xf0) >> 4, rtmpt_audio_packet_types, "Reserved audio packet type"));
at = proto_item_add_subtree(ai, ett_rtmpt_audio_multitrack_control);
proto_tree_add_uint(at, hf_rtmpt_audio_multitrack_packet_type, tvb, offset, 1, iAudioMultitrackCtl);
proto_tree_add_uint(at, hf_rtmpt_audio_multitrack_type, tvb, offset, 1, iAudioMultitrackCtl);
offset += 1;
isOneTrack = (iAudioMultitrackCtl & 0x0f) == RTMPT_IS_ONETRACK;
isManyTracksManyCodecs = (iAudioMultitrackCtl & 0x0f) == RTMPT_IS_MANYTRACKSMANYCODECS;
if (!isManyTracksManyCodecs) {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_audio_fourcc, tvb, offset, 4, ENC_ASCII);
offset += 4;
}
} else {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_audio_fourcc, tvb, offset, 4, ENC_ASCII);
offset += 4;
}
while(processAudioBody && tvb_reported_length_remaining(tvb, offset) > 0) {
if (isAudioMultitrack) {
iAudioTrackId = tvb_get_uint8(tvb, offset);
ai = proto_tree_add_uint(rtmpt_tree, hf_rtmpt_audio_track_id, tvb, offset, 1, iAudioTrackId);
at = proto_item_add_subtree(ai, ett_rtmpt_audio_multitrack_track);
offset += 1;
if (isManyTracksManyCodecs) {
proto_tree_add_item(at, hf_rtmpt_audio_fourcc, tvb, offset, 4, ENC_ASCII);
offset += 4;
}
if (!isOneTrack) {
iAudioTrackLength = tvb_get_uint24(tvb, offset, ENC_BIG_ENDIAN);
proto_tree_add_uint(at, hf_rtmpt_audio_track_length, tvb, offset, 3, iAudioTrackLength);
offset += 3;
proto_tree_add_item(at, hf_rtmpt_audio_data, tvb, offset, -1, ENC_NA);
offset += iAudioTrackLength;
} else {
proto_tree_add_item(at, hf_rtmpt_audio_data, tvb, offset, -1, ENC_NA);
processAudioBody = false;
}
} else {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_audio_data, tvb, offset, -1, ENC_NA);
processAudioBody = false;
}
}
} else {
ai = proto_tree_add_uint_format(rtmpt_tree, hf_rtmpt_audio_control, tvb, offset, 1, iCtl,
"Control: 0x%02x (%s %s %s %s)", iCtl,
val_to_str_const((iCtl & 0xf0) >> 4, rtmpt_audio_codecs, "Unknown codec"),
val_to_str_const((iCtl & 0x0c) >> 2, rtmpt_audio_rates, "Unknown rate"),
val_to_str_const((iCtl & 0x02) >> 1, rtmpt_audio_sizes, "Unknown sample size"),
val_to_str_const(iCtl & 0x01, rtmpt_audio_types, "Unknown channel count"));
at = proto_item_add_subtree(ai, ett_rtmpt_audio_control);
proto_tree_add_uint(at, hf_rtmpt_audio_format, tvb, offset, 1, iCtl);
proto_tree_add_uint(at, hf_rtmpt_audio_rate, tvb, offset, 1, iCtl);
proto_tree_add_uint(at, hf_rtmpt_audio_size, tvb, offset, 1, iCtl);
proto_tree_add_uint(at, hf_rtmpt_audio_type, tvb, offset, 1, iCtl);
proto_tree_add_item(rtmpt_tree, hf_rtmpt_audio_data, tvb, offset + 1, -1, ENC_NA);
}
}
static void
dissect_rtmpt_body_video(tvbuff_t *tvb, int offset, proto_tree *rtmpt_tree)
{
uint8_t iCtl;
uint8_t iMultitrackCtl;
uint8_t iVideoFrameType;
uint8_t iVideoPacketType;
uint8_t iAvMultitrackType;
uint32_t iVideoTrackLength;
proto_item *vi;
proto_tree *vt;
bool isVideoMultitrack = false;
bool isOneTrack = false;
bool isManyTracksManyCodecs = false;
bool processVideoBody = true;
iCtl = tvb_get_uint8(tvb, offset);
iVideoFrameType = (iCtl & 0x70) >> 4;
/*
* https://veovera.org/docs/enhanced/enhanced-rtmp-v2.pdf
*/
if (iCtl & RTMPT_IS_EX_VIDEO_HEADER) {
iVideoPacketType = iCtl & 0x0f;
isVideoMultitrack = iVideoPacketType == RTMPT_IS_VIDEO_MULTITRACK;
vi = proto_tree_add_uint_format(rtmpt_tree, hf_rtmpt_video_control, tvb, offset, 1, iCtl,
"Control: 0x%02x (%s %s)", iCtl,
val_to_str_const(iVideoFrameType, rtmpt_video_types, "Reserved frame type"),
val_to_str_const(iVideoPacketType, rtmpt_video_packet_types, "Reserved packet type"));
vt = proto_item_add_subtree(vi, ett_rtmpt_video_control);
proto_tree_add_item(vt, hf_rtmpt_video_is_ex_header, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(vt, hf_rtmpt_video_type, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(vt, hf_rtmpt_video_packet_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
if (iVideoPacketType != RTMPT_IS_PACKET_TYPE_METADATA && iVideoFrameType == RTMPT_IS_FRAME_TYPE_COMMAND) {
proto_tree_add_item(vt, hf_rtmpt_video_command, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
processVideoBody = false;
} else if (isVideoMultitrack) {
iMultitrackCtl = tvb_get_uint8(tvb, offset);
iAvMultitrackType = (iMultitrackCtl >> 4) & 0xf;
vi = proto_tree_add_uint_format(rtmpt_tree, hf_rtmpt_video_multitrack_control, tvb, offset, 1, iMultitrackCtl,
"Video Multitrack Control: 0x%02x (%s %s)", iMultitrackCtl,
val_to_str_const(iAvMultitrackType, rtmpt_av_multitrack_types, "Reserved av multitrack type"),
val_to_str_const(iMultitrackCtl & 0xf, rtmpt_video_packet_types, "Reserved video packet type"));
vt = proto_item_add_subtree(vi, ett_rtmpt_video_multitrack_control);
proto_tree_add_item(vt, hf_rtmpt_video_multitrack_type, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(vt, hf_rtmpt_video_multitrack_packet_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
isOneTrack = (iAvMultitrackType & 0x0f) == RTMPT_IS_ONETRACK;
isManyTracksManyCodecs = (iAvMultitrackType & 0x0f) == RTMPT_IS_MANYTRACKSMANYCODECS;
if (!isManyTracksManyCodecs) {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_video_fourcc, tvb, offset, 4, ENC_ASCII);
offset += 4;
}
} else {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_video_fourcc, tvb, offset, 4, ENC_ASCII);
offset += 4;
}
while (processVideoBody && tvb_reported_length_remaining(tvb, offset) > 0){
if (isVideoMultitrack) {
vi = proto_tree_add_item(rtmpt_tree, hf_rtmpt_video_track_id, tvb, offset, 1, ENC_BIG_ENDIAN);
vt = proto_item_add_subtree(vi, ett_rtmpt_video_multitrack_track);
if (isManyTracksManyCodecs) {
proto_tree_add_item(vt, hf_rtmpt_video_fourcc, tvb, offset, 4, ENC_ASCII);
offset += 4;
}
offset += 1;
if (!isOneTrack) {
iVideoTrackLength = tvb_get_uint24(tvb, offset, ENC_BIG_ENDIAN);
proto_tree_add_item(vt, hf_rtmpt_video_track_length, tvb, offset, 3, ENC_BIG_ENDIAN);
offset += 3;
proto_tree_add_item(vt, hf_rtmpt_video_data, tvb, offset, iVideoTrackLength, ENC_NA);
offset += iVideoTrackLength;
} else {
proto_tree_add_item(vt, hf_rtmpt_video_data, tvb, offset, -1, ENC_NA);
processVideoBody = false;
}
} else {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_video_data, tvb, offset, -1, ENC_NA);
processVideoBody = false;
}
}
} else {
vi = proto_tree_add_uint_format(rtmpt_tree, hf_rtmpt_video_control, tvb, offset, 1, iCtl,
"Control: 0x%02x (%s %s)", iCtl,
val_to_str_const(iVideoFrameType, rtmpt_video_types, "Reserved frame type"),
val_to_str_const(iCtl & 0x0f, rtmpt_video_codecs, "Unknown codec"));
vt = proto_item_add_subtree(vi, ett_rtmpt_video_control);
proto_tree_add_item(vt, hf_rtmpt_video_type, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(vt, hf_rtmpt_video_format, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
if (iVideoFrameType == RTMPT_IS_FRAME_TYPE_COMMAND) {
proto_tree_add_item(vt, hf_rtmpt_video_command, tvb, offset, 1, ENC_BIG_ENDIAN);
} else {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_video_data, tvb, offset, -1, ENC_NA);
}
}
}
static void
dissect_rtmpt_body_aggregate(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *rtmpt_tree)
{
proto_tree *tag_tree;
proto_tree *data_tree;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
uint8_t iTagType;
unsigned iDataSize;
iTagType = tvb_get_uint8(tvb, offset + 0);
iDataSize = tvb_get_ntoh24(tvb, offset + 1);
tag_tree = proto_tree_add_subtree(rtmpt_tree, tvb, offset, 11+iDataSize+4, ett_rtmpt_tag, NULL,
val_to_str_const(iTagType, rtmpt_tag_vals, "Unknown Tag"));
proto_tree_add_item(tag_tree, hf_rtmpt_tag_type, tvb, offset+0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tag_tree, hf_rtmpt_tag_datasize, tvb, offset+1, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(tag_tree, hf_rtmpt_tag_timestamp, tvb, offset+4, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(tag_tree, hf_rtmpt_tag_ets, tvb, offset+7, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tag_tree, hf_rtmpt_tag_streamid, tvb, offset+8, 3, ENC_BIG_ENDIAN);
data_tree = proto_tree_add_subtree(tag_tree, tvb, offset+11, iDataSize, ett_rtmpt_tag_data, NULL, "Data");
switch (iTagType) {
case 8:
dissect_rtmpt_body_audio(tvb, offset + 11, data_tree);
break;
case 9:
dissect_rtmpt_body_video(tvb, offset + 11, data_tree);
break;
case 18:
dissect_rtmpt_body_command(tvb, pinfo, offset + 11, data_tree, false);
break;
default:
break;
}
proto_tree_add_item(tag_tree, hf_rtmpt_tag_tagsize, tvb, offset+11+iDataSize, 4, ENC_BIG_ENDIAN);
offset += 11 + iDataSize + 4;
}
}
/* The main dissector for unchunked packets */
static void
dissect_rtmpt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, rtmpt_conv_t *rconv, int cdir, rtmpt_packet_t *tp)
{
int offset = 0;
char *sDesc = NULL;
bool deschasopcode = false;
bool haveETS = false;
uint32_t iBodyOffset = 0;
uint32_t iBodyRemain = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTMP");
ws_debug("Dissect: frame=%u visited=%d len=%d tree=%p",
pinfo->num, pinfo->fd->visited,
tvb_reported_length_remaining(tvb, offset), tree);
/* Clear any previous data in Info column (RTMP packets are protected by a "fence") */
col_clear(pinfo->cinfo, COL_INFO);
if (tvb_reported_length_remaining(tvb, offset) < 1) return;
if (tp->id <= RTMPT_ID_MAX) {
if (tp->fmt < 3
&& tvb_reported_length_remaining(tvb, offset) >= tp->bhlen+3
&& tvb_get_ntoh24(tvb, offset+tp->bhlen) == 0xffffff) {
haveETS = true;
}
iBodyOffset = offset + tp->bhlen + tp->mhlen;
iBodyRemain = tvb_reported_length_remaining(tvb, iBodyOffset);
if (tp->cmd == RTMPT_TYPE_CHUNK_SIZE && tp->len >= 4 && iBodyRemain >= 4) {
int32_t newchunksize = tvb_get_ntohl(tvb, iBodyOffset);
if (newchunksize > 0) {
wmem_tree_insert32(rconv->chunksize[cdir], tp->lastseq, GINT_TO_POINTER(newchunksize));
}
}
if (tp->cmd == RTMPT_TYPE_COMMAND_AMF0 || tp->cmd == RTMPT_TYPE_COMMAND_AMF3 ||
tp->cmd == RTMPT_TYPE_DATA_AMF0 || tp->cmd == RTMPT_TYPE_DATA_AMF3) {
uint32_t soff = 0;
if (tp->cmd == RTMPT_TYPE_COMMAND_AMF3 || tp->cmd == RTMPT_TYPE_DATA_AMF3) {
soff = 1;
}
tp->txid = rtmpt_get_amf_txid(tvb, iBodyOffset+soff, tree);
if (tp->txid != 0 && !PINFO_FD_VISITED(pinfo)) {
ws_debug("got txid=%d", tp->txid);
wmem_tree_insert32(rconv->txids[cdir], tp->txid, GINT_TO_POINTER(pinfo->num));
}
}
} else if (tp->id == RTMPT_TYPE_HANDSHAKE_2 || tp->id == RTMPT_TYPE_HANDSHAKE_3) {
uint32_t newchunksize = RTMPT_INITIAL_CHUNK_SIZE;
wmem_tree_insert32(rconv->chunksize[cdir], tp->lastseq, GINT_TO_POINTER(newchunksize));
}
if (tp->id <= RTMPT_ID_MAX)
{
sDesc = rtmpt_get_packet_desc(tvb, iBodyOffset, tree, iBodyRemain, rconv, cdir, tp, &deschasopcode);
}
if (tp->id>RTMPT_ID_MAX) {
col_append_sep_str(pinfo->cinfo, COL_INFO, "|",
val_to_str(tp->id, rtmpt_handshake_vals, "Unknown (0x%01x)"));
col_set_fence(pinfo->cinfo, COL_INFO);
} else if (sDesc) {
col_append_sep_str(pinfo->cinfo, COL_INFO, "|", sDesc);
col_set_fence(pinfo->cinfo, COL_INFO);
} else {
col_append_sep_str(pinfo->cinfo, COL_INFO, "|",
val_to_str(tp->cmd, rtmpt_opcode_vals, "Unknown (0x%01x)"));
col_set_fence(pinfo->cinfo, COL_INFO);
}
if (tree)
{
proto_tree *rtmpt_tree = NULL;
proto_tree *rtmptroot_tree = NULL;
proto_item *ti;
ti = proto_tree_add_item(tree, proto_rtmpt, tvb, offset, -1, ENC_NA);
if (tp->id > RTMPT_ID_MAX) {
/* Dissect handshake */
proto_item_append_text(ti, " (%s)",
val_to_str(tp->id, rtmpt_handshake_vals, "Unknown (0x%01x)"));
rtmptroot_tree = proto_item_add_subtree(ti, ett_rtmpt);
rtmpt_tree = proto_tree_add_subtree(rtmptroot_tree, tvb, offset, -1, ett_rtmpt_handshake, NULL,
val_to_str(tp->id, rtmpt_handshake_vals, "Unknown (0x%01x)"));
if (tp->id == RTMPT_TYPE_HANDSHAKE_1)
{
proto_tree_add_item(rtmpt_tree, hf_rtmpt_handshake_c0, tvb, 0, 1, ENC_NA);
proto_tree_add_item(rtmpt_tree, hf_rtmpt_handshake_c1, tvb, 1, 1536, ENC_NA);
}
else if (tp->id == RTMPT_TYPE_HANDSHAKE_2)
{
proto_tree_add_item(rtmpt_tree, hf_rtmpt_handshake_s0, tvb, 0, 1, ENC_NA);
proto_tree_add_item(rtmpt_tree, hf_rtmpt_handshake_s1, tvb, 1, 1536, ENC_NA);
proto_tree_add_item(rtmpt_tree, hf_rtmpt_handshake_s2, tvb, 1537, 1536, ENC_NA);
}
else if (tp->id == RTMPT_TYPE_HANDSHAKE_3)
{
proto_tree_add_item(rtmpt_tree, hf_rtmpt_handshake_c2, tvb, 0, 1536, ENC_NA);
}
return;
}
if (sDesc && deschasopcode) {
proto_item_append_text(ti, " (%s)", sDesc);
} else if (sDesc) {
proto_item_append_text(ti, " (%s %s)",
val_to_str(tp->cmd, rtmpt_opcode_vals, "Unknown (0x%01x)"), sDesc);
} else {
proto_item_append_text(ti, " (%s)",
val_to_str(tp->cmd, rtmpt_opcode_vals, "Unknown (0x%01x)"));
}
rtmptroot_tree = proto_item_add_subtree(ti, ett_rtmpt);
/* Function call/response matching */
if (tp->otherframe != 0) {
proto_tree_add_uint(rtmptroot_tree,
tp->isresponse ? hf_rtmpt_function_response : hf_rtmpt_function_call,
tvb, offset, tp->bhlen+tp->mhlen+tp->len,
tp->otherframe);
}
/* Dissect header fields */
rtmpt_tree = proto_tree_add_subtree(rtmptroot_tree, tvb, offset, tp->bhlen+tp->mhlen, ett_rtmpt_header, NULL, RTMPT_TEXT_RTMP_HEADER);
/* proto_item_append_text(ti, " (%s)", val_to_str(tp->cmd, rtmpt_opcode_vals, "Unknown (0x%01x)")); */
if (tp->fmt <= 3) proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_format, tvb, offset + 0, 1, ENC_BIG_ENDIAN);
if (tp->fmt <= 3) proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_csid, tvb, offset + 0, tp->bhlen, ENC_BIG_ENDIAN);
if (tp->fmt <= 2) {
if (tp->fmt > 0) {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_timestamp_delta, tvb, offset + tp->bhlen, 3, ENC_BIG_ENDIAN);
} else {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_timestamp, tvb, offset + tp->bhlen, 3, ENC_BIG_ENDIAN);
}
if (haveETS) {
proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_ets, tvb, offset + tp->bhlen + tp->mhlen - 4, 4, ENC_BIG_ENDIAN);
}
}
if ((tp->fmt>0 && !haveETS) || tp->fmt == 3) {
proto_tree_add_uint_format_value(rtmpt_tree, hf_rtmpt_header_timestamp, tvb, offset + tp->bhlen, 0, tp->ts, "%d (calculated)", tp->ts);
}
if (tp->fmt <= 1) proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_body_size, tvb, offset + tp->bhlen + 3, 3, ENC_BIG_ENDIAN);
if (tp->fmt <= 1) proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_typeid, tvb, offset + tp->bhlen + 6, 1, ENC_BIG_ENDIAN);
if (tp->fmt <= 0) proto_tree_add_item(rtmpt_tree, hf_rtmpt_header_streamid, tvb, offset + tp->bhlen + 7, 4, ENC_LITTLE_ENDIAN);
/* Dissect body */
if (tp->len == 0) return;
offset = iBodyOffset;
rtmpt_tree = proto_tree_add_subtree(rtmptroot_tree, tvb, offset, -1, ett_rtmpt_body, NULL, RTMPT_TEXT_RTMP_BODY);
switch (tp->cmd) {
case RTMPT_TYPE_CHUNK_SIZE:
case RTMPT_TYPE_ABORT_MESSAGE:
case RTMPT_TYPE_ACKNOWLEDGEMENT:
case RTMPT_TYPE_UCM:
case RTMPT_TYPE_WINDOW:
case RTMPT_TYPE_PEER_BANDWIDTH:
dissect_rtmpt_body_scm(tvb, offset, rtmpt_tree, tp->cmd);
break;
case RTMPT_TYPE_COMMAND_AMF0:
case RTMPT_TYPE_DATA_AMF0:
dissect_rtmpt_body_command(tvb, pinfo, offset, rtmpt_tree, false);
break;
case RTMPT_TYPE_COMMAND_AMF3:
case RTMPT_TYPE_DATA_AMF3:
dissect_rtmpt_body_command(tvb, pinfo, offset, rtmpt_tree, true);
break;
case RTMPT_TYPE_AUDIO_DATA:
dissect_rtmpt_body_audio(tvb, offset, rtmpt_tree);
break;
case RTMPT_TYPE_VIDEO_DATA:
dissect_rtmpt_body_video(tvb, offset, rtmpt_tree);
break;
case RTMPT_TYPE_AGGREGATE:
dissect_rtmpt_body_aggregate(tvb, pinfo, offset, rtmpt_tree);
break;
}
}
}
/* Unchunk a data stream into individual RTMP packets */
static void
dissect_rtmpt_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, rtmpt_conv_t *rconv, int cdir, uint32_t seq, uint32_t lastackseq)
{
int offset = 0;
int remain;
int want;
uint8_t header_type;
int basic_hlen;
int message_hlen;
uint32_t id;
uint32_t ts = 0;
uint32_t tsd = 0;
int body_len;
uint8_t cmd;
uint32_t src;
int chunk_size;
rtmpt_frag_t *tf;
rtmpt_id_t *ti;
rtmpt_packet_t *tp;
tvbuff_t *pktbuf;
remain = tvb_reported_length(tvb);
if (!remain)
return;
ws_debug("Segment: cdir=%d seq=%d-%d", cdir, seq, seq+remain-1);
if (pinfo->fd->visited) {
/* Already done the work, so just dump the existing state */
/* XXX: If there's bogus sequence numbers and the
* tcp.analyze_sequence_numbers pref is true, we can't actually
* assume that we processed this frame the first time around,
* since the TCP dissector might not have given it to us.
*/
wmem_stack_t *packets;
/* List all RTMP packets terminating in this TCP segment, from end to beginning */
packets = wmem_stack_new(pinfo->pool);
wmem_stack_push(packets, 0);
tp = (rtmpt_packet_t *)wmem_tree_lookup32_le(rconv->packets[cdir], seq+remain-1);
while (tp && GE_SEQ(tp->lastseq, seq)) {
/* Sequence numbers can wrap around (especially with
* tcp.relative_sequence_numbers false), so use the
* wrap around aware comparison from packet-tcp.h
*/
wmem_stack_push(packets, tp);
if (tp->seq == 0) {
// reached first segment.
/* XXX: Assuming tcp.relative_sequence_numbers
* is true, that is, since on TCP we just
* reuse the sequence numbers from tcpinfo.
*/
break;
}
if (tp->seq > tp->lastseq) {
/* XXX: There are some problems with sequence
* numbers that wraparound in the middle of
* a segment and using wmem_tree_lookup32_le
* below. Break out here to guarantee that there
* is a limit to the tree lookups and we don't
* have infinite loops. Really a lot of this
* code should be rewritten to deal with
* sequence numbers that wrap around (especially
* (SYN packets with altered sequence numbers
* and out of order packets.)
*/
break;
}
tp = (rtmpt_packet_t *)wmem_tree_lookup32_le(rconv->packets[cdir], tp->seq-1);
}
/* Dissect the generated list in reverse order (beginning to end) */
while ((tp=(rtmpt_packet_t *)wmem_stack_pop(packets)) != NULL) {
if (tp->resident) {
pktbuf = tvb_new_child_real_data(tvb, tp->data.p, tp->have, tp->have);
add_new_data_source(pinfo, pktbuf, "Unchunked RTMP");
} else {
pktbuf = tvb_new_subset_length(tvb, tp->data.offset, tp->have);
}
dissect_rtmpt(pktbuf, pinfo, tree, rconv, cdir, tp);
}
return;
}
while (remain>0) {
tf = NULL;
ti = NULL;
tp = NULL;
/* Check for outstanding fragmented headers/chunks first */
if (offset == 0) {
tf = (rtmpt_frag_t *)wmem_tree_lookup32_le(rconv->frags[cdir], seq+offset-1);
if (tf) {
/* May need to reassemble cross-TCP-segment fragments */
ws_noisy(" tf seq=%d lseq=%d h=%d l=%d", tf->seq, tf->lastseq, tf->have, tf->len);
if (tf->have >= tf->len || seq+offset < tf->seq || seq+offset > tf->lastseq+tf->len-tf->have) {
tf = NULL;
} else if (!tf->ishdr) {
ti = (rtmpt_id_t *)wmem_tree_lookup32(rconv->ids[cdir], tf->saved.id);
if (ti) {
tp = (rtmpt_packet_t *)wmem_tree_lookup32_le(ti->packets, seq+offset-1);
}
if (tp && tp->chunkwant) {
goto unchunk;
}
tf = NULL;
ti = NULL;
tp = NULL;
}
if (tf) {
/* The preceding segment contained an incomplete chunk header */
want = tf->len - tf->have;
if (remain<want)
want = remain;
tvb_memcpy(tvb, tf->saved.d+tf->have, offset, want);
id = tf->saved.d[0];
header_type = (id>>6) & 3;
basic_hlen = rtmpt_basic_header_length(id);
if ((header_type < 3) && (tf->have < (basic_hlen+3)) && (tf->have+want >= (basic_hlen+3))) {
if (pntoh24(tf->saved.d+basic_hlen) == 0xffffff) {
tf->len += 4;
}
}
tf->have += want;
tf->lastseq = seq+want-1;
remain -= want;
offset += want;
if (tf->have < tf->len) {
return;
}
}
}
}
if (!tf) {
/* No preceding data, get header data starting at current position */
id = tvb_get_uint8(tvb, offset);
if (id == RTMPT_MAGIC && seq+offset == RTMPT_HANDSHAKE_OFFSET_1) {
header_type = 4;
basic_hlen = 1;
message_hlen = 0;
id = lastackseq == 1 ? RTMPT_TYPE_HANDSHAKE_1 : RTMPT_TYPE_HANDSHAKE_2;
} else if (seq+offset == RTMPT_HANDSHAKE_OFFSET_2) {
header_type = 4;
basic_hlen = 0;
message_hlen = 0;
id = RTMPT_TYPE_HANDSHAKE_3;
} else {
header_type = (id>>6) & 3;
basic_hlen = rtmpt_basic_header_length(id);
message_hlen = rtmpt_message_header_length(id);
if ((header_type < 3) && (remain >= (basic_hlen+3))) {
if (tvb_get_ntoh24(tvb, offset+basic_hlen) == 0xffffff) {
message_hlen += 4;
}
}
if (remain < (basic_hlen+message_hlen)) {
/* Ran out of packet mid-header, save and try again next time */
tf = wmem_new(wmem_file_scope(), rtmpt_frag_t);
tf->ishdr = 1;
tf->seq = seq + offset;
tf->lastseq = tf->seq + remain - 1;
tf->len = basic_hlen + message_hlen;
tvb_memcpy(tvb, tf->saved.d, offset, remain);
tf->have = remain;
wmem_tree_insert32(rconv->frags[cdir], seq+offset, tf);
return;
}
id = id & 0x3f;
if (id == 0)
id = tvb_get_uint8(tvb, offset+1) + 64;
else if (id == 1)
id = tvb_get_letohs(tvb, offset+1) + 64;
}
} else {
/* Use reassembled header data */
id = tf->saved.d[0];
header_type = (id>>6) & 3;
basic_hlen = rtmpt_basic_header_length(id);
message_hlen = tf->len - basic_hlen;
id = id & 0x3f;
if (id == 0)
id = tf->saved.d[1] + 64;
else if (id == 1)
id = pletoh16(tf->saved.d+1) + 64;
}
/* Calculate header values, defaulting from previous packets with same id */
if (id <= RTMPT_ID_MAX)
ti = (rtmpt_id_t *)wmem_tree_lookup32(rconv->ids[cdir], id);
if (ti)
tp = (rtmpt_packet_t *)wmem_tree_lookup32_le(ti->packets, seq+offset-1);
if (header_type == 0)
src = tf ? pntoh32(tf->saved.d+basic_hlen+7) : tvb_get_ntohl(tvb, offset+basic_hlen+7);
else if (ti)
src = ti->src;
else src = 0;
if (header_type < 2)
cmd = tf ? tf->saved.d[basic_hlen+6] : tvb_get_uint8(tvb, offset+basic_hlen+6);
else if (ti)
cmd = ti->cmd;
else
cmd = 0;
/* Calculate chunk_size now as a last-resort default payload length */
if (id > RTMPT_ID_MAX) {
if (id == RTMPT_TYPE_HANDSHAKE_1)
chunk_size = body_len = 1536;
else if (id == RTMPT_TYPE_HANDSHAKE_2)
chunk_size = body_len = 3072;
else /* if (id == RTMPT_TYPE_HANDSHAKE_3) */
chunk_size = body_len = 1536;
} else {
chunk_size = GPOINTER_TO_INT(wmem_tree_lookup32_le(rconv->chunksize[cdir], seq+offset-1));
if (!chunk_size) {
chunk_size = ((int)rtmpt_default_chunk_size > 0) ? rtmpt_default_chunk_size : INT_MAX;
}
if (header_type < 2)
body_len = tf ? pntoh24(tf->saved.d+basic_hlen+3) : tvb_get_ntoh24(tvb, offset+basic_hlen+3);
else if (ti)
body_len = ti->len;
else
body_len = chunk_size;
}
if (!ti || !tp || header_type<3 || tp->have == tp->want || tp->chunkhave != tp->chunkwant) {
/* Start a new packet if:
* no previous packet with same id
* not a short 1-byte header
* previous packet with same id was complete
* previous incomplete chunk not handled by fragment handler
*/
ws_noisy("New packet cdir=%d seq=%d ti=%p tp=%p header_type=%d header_len=%d id=%d tph=%d tpw=%d len=%d cs=%d",
cdir, seq+offset,
ti, tp, header_type, basic_hlen+message_hlen, id, tp?tp->have:0, tp?tp->want:0, body_len, chunk_size);
if (!ti) {
ti = wmem_new(wmem_file_scope(), rtmpt_id_t);
ti->packets = wmem_tree_new(wmem_file_scope());
ti->ts = 0;
ti->tsd = 0;
wmem_tree_insert32(rconv->ids[cdir], id, ti);
}
if (header_type == 0) {
ts = tf ? pntoh24(tf->saved.d+basic_hlen) : tvb_get_ntoh24(tvb, offset+basic_hlen);
if (ts == 0xffffff) {
ts = tf ? pntoh32(tf->saved.d+basic_hlen+11) : tvb_get_ntohl(tvb, offset+basic_hlen+11);
}
tsd = ts - ti->ts;
} else if (header_type < 3) {
tsd = tf ? pntoh24(tf->saved.d+basic_hlen) : tvb_get_ntoh24(tvb, offset+basic_hlen);
if (tsd == 0xffffff) {
ts = tf ? pntoh32(tf->saved.d+basic_hlen+message_hlen-4) : tvb_get_ntohl(tvb, offset+basic_hlen+message_hlen-4);
tsd = ti->tsd; /* questionable */
} else {
ts = ti->ts + tsd;
}
} else {
ts = ti->ts + ti->tsd;
tsd = ti->tsd;
}
/* create a new packet structure */
tp = wmem_new(wmem_file_scope(), rtmpt_packet_t);
tp->seq = tp->lastseq = tf ? tf->seq : seq+offset;
tp->have = 0;
tp->want = basic_hlen + message_hlen + body_len;
tp->chunkwant = 0;
tp->chunkhave = 0;
tp->bhlen = basic_hlen;
tp->mhlen = message_hlen;
tp->fmt = header_type;
tp->id = id;
tp->ts = ts;
tp->len = body_len;
if (id > RTMPT_ID_MAX)
tp->cmd = id;
else
tp->cmd = cmd & 0x7f;
tp->src = src;
tp->txid = 0;
tp->isresponse = false;
tp->otherframe = 0;
tp->frames = wmem_list_new(wmem_file_scope());
wmem_list_prepend(tp->frames, GUINT_TO_POINTER(pinfo->num));
/* Save the header information for future defaulting needs */
ti->ts = ts;
ti->tsd = tsd;
ti->len = body_len;
ti->cmd = cmd;
ti->src = src;
/* store against the id only until unchunking is complete */
wmem_tree_insert32(ti->packets, tp->seq, tp);
if (!tf && body_len <= chunk_size && tp->want <= remain) {
/* The easy case - a whole packet contiguous and fully within this segment */
tp->resident = false;
tp->data.offset = offset;
tp->lastseq = seq+offset+tp->want-1;
tp->have = tp->want;
wmem_tree_insert32(rconv->packets[cdir], tp->lastseq, tp);
pktbuf = tvb_new_subset_length(tvb, tp->data.offset, tp->have);
dissect_rtmpt(pktbuf, pinfo, tree, rconv, cdir, tp);
offset += tp->want;
remain -= tp->want;
continue;
} else {
/* Some more reassembly required */
tp->resident = true;
/* tp->want is how much data we think we want.
* If it's a really big number, we don't want
* to allocate it all at once, due to memory
* exhaustion on fuzzed data (#6898).
* RTMPT_INIT_ALLOC_SIZE should always be larger
* than basic_hlen + message_hlen.
*/
tp->alloc = MIN(tp->want, RTMPT_INIT_ALLOC_SIZE);
tp->data.p = (uint8_t *)wmem_alloc(wmem_file_scope(), tp->alloc);
if (tf && tf->ishdr) {
memcpy(tp->data.p, tf->saved.d, tf->len);
} else {
tvb_memcpy(tvb, tp->data.p, offset, basic_hlen+message_hlen);
offset += basic_hlen + message_hlen;
remain -= basic_hlen + message_hlen;
}
tp->lastseq = seq+offset-1;
tp->have = basic_hlen + message_hlen;
if (tp->have == tp->want) {
wmem_tree_insert32(rconv->packets[cdir], tp->lastseq, tp);
pktbuf = tvb_new_child_real_data(tvb, tp->data.p, tp->have, tp->have);
add_new_data_source(pinfo, pktbuf, "Unchunked RTMP");
dissect_rtmpt(pktbuf, pinfo, tree, rconv, cdir, tp);
continue;
}
tp->chunkwant = chunk_size;
if (tp->chunkwant > tp->want-tp->have)
tp->chunkwant = tp->want - tp->have;
}
} else {
if (header_type == 3 && tp->resident && tp->have > tp->bhlen + 3
&& pntoh24(tp->data.p+tp->bhlen) == 0xffffff) {
/* Header type 3 resends the extended time stamp if the last message on the chunk
* stream had an extended timestamp.
* See: https://gitlab.com/wireshark/wireshark/-/issues/15718
*/
message_hlen += 4;
}
ws_noisy("Old packet cdir=%d seq=%d ti=%p tp=%p header_len=%d id=%d tph=%d tpw=%d len=%d cs=%d",
cdir, seq+offset,
ti, tp, basic_hlen+message_hlen, id, tp?tp->have:0, tp?tp->want:0, body_len, chunk_size);
tp->chunkwant = chunk_size;
if (tp->chunkwant > tp->want-tp->have)
tp->chunkwant = tp->want - tp->have;
offset += basic_hlen + message_hlen;
remain -= basic_hlen + message_hlen;
}
tf = NULL;
/* Last case to deal with is unchunking the packet body */
unchunk:
want = tp->chunkwant - tp->chunkhave;
if (want > remain)
want = remain;
ws_noisy(" cw=%d ch=%d r=%d w=%d", tp->chunkwant, tp->chunkhave, remain, want);
/* message length is a 3 byte number, never overflows an int */
if (tp->alloc < tp->have + want) {
/* tp->want - how much data is supposedly in the entire
* unchunked packet, according to the header. Up to a
* 24-bit integer. Actually allocating this amount can
* cause memory exhaustion on fuzzed data.
* want - how much more data we are going to copy from the
* current tvbuff. No more than necessary to finish the
* current chunk, or what's actually in the tvbuff.
* Allocating this amount shouldn't cause memory exhaustion
* because it's present in the frame.
*
* We should have calculated those values so that the
* following assertion is true.
*/
DISSECTOR_ASSERT_CMPINT(tp->have + want, <=, tp->want);
tp->alloc = MAX(tp->alloc*2, tp->have + want);
tp->alloc = MIN(tp->alloc, tp->want);
tp->data.p = wmem_realloc(wmem_file_scope(), tp->data.p, tp->alloc);
}
tvb_memcpy(tvb, tp->data.p+tp->have, offset, want);
wmem_list_frame_t *frame_head = wmem_list_head(tp->frames);
if (wmem_list_frame_data(frame_head) != GUINT_TO_POINTER(pinfo->num)) {
wmem_list_prepend(tp->frames, GUINT_TO_POINTER(pinfo->num));
}
if (tf) {
tf->have += want;
tf->lastseq = seq+offset+want-1;
}
tp->lastseq = seq+offset+want-1;
tp->have += want;
tp->chunkhave += want;
offset += want;
remain -= want;
if (tp->chunkhave == tp->chunkwant) {
/* Chunk is complete - wait for next header */
tp->chunkhave = 0;
tp->chunkwant = 0;
}
if (tp->have == tp->want) {
/* Whole packet is complete */
wmem_tree_insert32(rconv->packets[cdir], tp->lastseq, tp);
wmem_list_foreach(tp->frames, rtmpt_packet_mark_depended, pinfo->fd);
pktbuf = tvb_new_child_real_data(tvb, tp->data.p, tp->have, tp->have);
add_new_data_source(pinfo, pktbuf, "Unchunked RTMP");
dissect_rtmpt(pktbuf, pinfo, tree, rconv, cdir, tp);
} else if (tp->chunkhave < tp->chunkwant) {
/* Chunk is split across segment boundary */
rtmpt_frag_t *tf2 = wmem_new(wmem_file_scope(), rtmpt_frag_t);
tf2->ishdr = 0;
tf2->seq = seq + offset - want;
tf2->lastseq = tf2->seq + remain - 1 + want;
tf2->have = tp->chunkhave;
tf2->len = tp->chunkwant;
tf2->saved.id = tp->id;
ws_noisy(" inserting tf @ %d", seq+offset-want-1);
wmem_tree_insert32(rconv->frags[cdir], seq+offset-want-1, tf2);
}
}
}
static rtmpt_conv_t *
rtmpt_init_rconv(conversation_t *conv)
{
rtmpt_conv_t *rconv = wmem_new(wmem_file_scope(), rtmpt_conv_t);
conversation_add_proto_data(conv, proto_rtmpt, rconv);
rconv->seqs[0] = wmem_tree_new(wmem_file_scope());
rconv->seqs[1] = wmem_tree_new(wmem_file_scope());
rconv->frags[0] = wmem_tree_new(wmem_file_scope());
rconv->frags[1] = wmem_tree_new(wmem_file_scope());
rconv->ids[0] = wmem_tree_new(wmem_file_scope());
rconv->ids[1] = wmem_tree_new(wmem_file_scope());
rconv->packets[0] = wmem_tree_new(wmem_file_scope());
rconv->packets[1] = wmem_tree_new(wmem_file_scope());
rconv->chunksize[0] = wmem_tree_new(wmem_file_scope());
rconv->chunksize[1] = wmem_tree_new(wmem_file_scope());
rconv->txids[0] = wmem_tree_new(wmem_file_scope());
rconv->txids[1] = wmem_tree_new(wmem_file_scope());
return rconv;
}
static int
dissect_rtmpt_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
conversation_t *conv;
rtmpt_conv_t *rconv;
int cdir;
struct tcpinfo *tcpinfo;
/* Reject the packet if data is NULL */
if (data == NULL) {
return 0;
}
tcpinfo = (struct tcpinfo*)data;
conv = find_or_create_conversation(pinfo);
rconv = (rtmpt_conv_t*)conversation_get_proto_data(conv, proto_rtmpt);
if (!rconv) {
rconv = rtmpt_init_rconv(conv);
}
cdir = (addresses_equal(conversation_key_addr1(conv->key_ptr), &pinfo->src) &&
addresses_equal(conversation_key_addr2(conv->key_ptr), &pinfo->dst) &&
conversation_key_port1(conv->key_ptr) == pinfo->srcport &&
conversation_key_port2(conv->key_ptr) == pinfo->destport) ? 0 : 1;
dissect_rtmpt_common(tvb, pinfo, tree, rconv, cdir, tcpinfo->seq, tcpinfo->lastackseq);
return tvb_reported_length(tvb);
}
static int
dissect_rtmpt_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
conversation_t *conv;
rtmpt_conv_t *rconv;
int cdir;
uint32_t seq;
uint32_t lastackseq;
uint32_t offset;
int remain;
offset = 0;
remain = tvb_reported_length_remaining(tvb, 0);
/*
* Request flow:
*
* POST /open/1
* request body is a single non-RTMP byte
* response contains a client ID <cid> followed by NL
* POST /send/<cid>/<seq>
* <seq> starts at 0 after open and increments on each
* subsequent post
* request body is pure RTMP data
* response is a single non-RTMP byte followed by RTMP data
* POST /idle/<cid>/<seq>
* request contains a single non-RTMP byte
* response is a single non-RTMP byte followed by RTMP data
* POST /close/<cid>/<seq>
* request and response contain a single non-RTMP byte
*
* Ideally here we'd know:
*
* 1) Whether this is was a HTTP request or response
* (this gives us cdir directly)
* 2) The requested URL (for both cases)
* (this tells us the type of framing bytes present,
* so whether there are any real bytes present). We
* could also use the client ID to identify the
* conversation, since each POST is likely to be on
* a different TCP connection, and there could be
* multiple simultaneous sessions from a single
* client (which we don't deal with here.)
*
* As it is, we currently have to just guess, and are
* likely easily confused.
*/
cdir = pinfo->srcport == pinfo->match_uint;
if (cdir) {
conv = find_conversation(pinfo->num, &pinfo->dst, &pinfo->src, conversation_pt_to_conversation_type(pinfo->ptype), 0, pinfo->srcport, 0);
if (!conv) {
ws_debug("RTMPT new conversation");
conv = conversation_new(pinfo->num, &pinfo->dst, &pinfo->src, conversation_pt_to_conversation_type(pinfo->ptype), 0, pinfo->srcport, 0);
}
} else {
conv = find_conversation(pinfo->num, &pinfo->src, &pinfo->dst, conversation_pt_to_conversation_type(pinfo->ptype), 0, pinfo->destport, 0);
if (!conv) {
ws_debug("RTMPT new conversation");
conv = conversation_new(pinfo->num, &pinfo->src, &pinfo->dst, conversation_pt_to_conversation_type(pinfo->ptype), 0, pinfo->destport, 0);
}
}
rconv = (rtmpt_conv_t*)conversation_get_proto_data(conv, proto_rtmpt);
if (!rconv) {
rconv = rtmpt_init_rconv(conv);
}
/* Work out a TCP-like sequence numbers for the tunneled data stream.
* If we've seen the packet before we'll have stored the seq of our
* last byte against the frame number - since we know how big we are
* we can work out the seq of our first byte. If this is the first
* time, we use the stored seq of the last byte of the previous frame
* plus one. If there is no previous frame then we must be at seq=1!
* (This is per-conversation and per-direction, of course.) */
lastackseq = GPOINTER_TO_INT(wmem_tree_lookup32_le(rconv->seqs[cdir ^ 1], pinfo->num))+1;
if (cdir == 1 && lastackseq < 2 && remain == 17) {
/* Session startup: the client makes an /open/ request and
* the server responds with a 16 bytes client
* identifier followed by a newline */
offset += 17;
remain -= 17;
} else if (cdir || remain == 1) {
/* All other server responses start with one byte which
* is not part of the RTMP stream. Client /idle/ requests
* contain a single byte also not part of the stream. We
* must discard these */
offset++;
remain--;
}
seq = GPOINTER_TO_INT(wmem_tree_lookup32(rconv->seqs[cdir], pinfo->num));
if (seq == 0) {
seq = GPOINTER_TO_INT(wmem_tree_lookup32_le(rconv->seqs[cdir], pinfo->num));
seq += remain;
wmem_tree_insert32(rconv->seqs[cdir], pinfo->num, GINT_TO_POINTER(seq));
}
seq -= remain-1;
ws_debug("RTMPT f=%d cdir=%d seq=%d lastackseq=%d len=%d", pinfo->num, cdir, seq, lastackseq, remain);
if (remain < 1)
return offset;
if (offset > 0) {
tvbuff_t *tvbrtmp = tvb_new_subset_length(tvb, offset, remain);
dissect_rtmpt_common(tvbrtmp, pinfo, tree, rconv, cdir, seq, lastackseq);
} else {
dissect_rtmpt_common(tvb, pinfo, tree, rconv, cdir, seq, lastackseq);
}
return tvb_captured_length(tvb);
}
static bool
dissect_rtmpt_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
conversation_t *conversation;
if (tvb_reported_length(tvb) >= 12)
{
/* To avoid a too high rate of false positive, this heuristics only matches the protocol
from the first server response packet and not from the client request packets before.
Therefore it is necessary to a "Decode as" to properly decode the first packets */
struct tcpinfo *tcpinfo = (struct tcpinfo *)data;
if (tcpinfo->lastackseq == RTMPT_HANDSHAKE_OFFSET_2
&& tcpinfo->seq == RTMPT_HANDSHAKE_OFFSET_1
&& tvb_get_uint8(tvb, 0) == RTMPT_MAGIC)
{
/* Register this dissector for this conversation */
conversation = find_or_create_conversation(pinfo);
conversation_set_dissector(conversation, rtmpt_tcp_handle);
/* Dissect the packet */
dissect_rtmpt_tcp(tvb, pinfo, tree, data);
return true;
}
}
return false;
}
static int
dissect_amf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *amf_tree, *headers_tree, *messages_tree;
int offset;
unsigned header_count, message_count, i;
unsigned string_length;
unsigned header_length, message_length;
bool amf3_encoding = false;
/*
* XXX - is "application/x-amf" just AMF3?
*/
ti = proto_tree_add_item(tree, proto_amf, tvb, 0, -1, ENC_NA);
amf_tree = proto_item_add_subtree(ti, ett_amf);
offset = 0;
proto_tree_add_item(amf_tree, hf_amf_version, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
header_count = tvb_get_ntohs(tvb, offset);
proto_tree_add_item(amf_tree, hf_amf_header_count, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
if (header_count != 0) {
headers_tree = proto_tree_add_subtree(amf_tree, tvb, offset, -1, ett_amf_headers, NULL, "Headers");
for (i = 0; i < header_count; i++) {
string_length = tvb_get_ntohs(tvb, offset);
proto_tree_add_item(headers_tree, hf_amf_header_name, tvb, offset, 2, ENC_UTF_8|ENC_BIG_ENDIAN);
offset += 2 + string_length;
proto_tree_add_item(headers_tree, hf_amf_header_must_understand, tvb, offset, 1, ENC_NA);
offset += 1;
header_length = tvb_get_ntohl(tvb, offset);
if (header_length == 0xFFFFFFFF)
proto_tree_add_uint_format_value(headers_tree, hf_amf_header_length, tvb, offset, 4, header_length, "Unknown");
else
proto_tree_add_item(headers_tree, hf_amf_header_length, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
if (amf3_encoding)
offset = dissect_amf3_value_type(tvb, pinfo, offset, headers_tree, NULL);
else
offset = dissect_amf0_value_type(tvb, pinfo, offset, headers_tree, &amf3_encoding, NULL);
}
}
message_count = tvb_get_ntohs(tvb, offset);
proto_tree_add_item(amf_tree, hf_amf_message_count, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
if (message_count != 0) {
messages_tree = proto_tree_add_subtree(amf_tree, tvb, offset, -1, ett_amf_messages, NULL, "Messages");
for (i = 0; i < message_count; i++) {
string_length = tvb_get_ntohs(tvb, offset);
proto_tree_add_item(messages_tree, hf_amf_message_target_uri, tvb, offset, 2, ENC_UTF_8|ENC_BIG_ENDIAN);
offset += 2 + string_length;
string_length = tvb_get_ntohs(tvb, offset);
proto_tree_add_item(messages_tree, hf_amf_message_response_uri, tvb, offset, 2, ENC_UTF_8|ENC_BIG_ENDIAN);
offset += 2 + string_length;
message_length = tvb_get_ntohl(tvb, offset);
if (message_length == 0xFFFFFFFF)
proto_tree_add_uint_format_value(messages_tree, hf_amf_message_length, tvb, offset, 4, message_length, "Unknown");
else
proto_tree_add_item(messages_tree, hf_amf_message_length, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
offset = dissect_rtmpt_body_command(tvb, pinfo, offset, messages_tree, false);
}
}
return tvb_captured_length(tvb);
}
void
proto_register_rtmpt(void)
{
static hf_register_info hf[] = {
/* RTMP Handshake data */
{ &hf_rtmpt_handshake_c0,
{ "Protocol version", "rtmpt.handshake.c0", FT_BYTES, BASE_NONE,
NULL, 0x0, "RTMPT Handshake C0", HFILL }},
{ &hf_rtmpt_handshake_s0,
{ "Protocol version", "rtmpt.handshake.s0", FT_BYTES, BASE_NONE,
NULL, 0x0, "RTMPT Handshake S0", HFILL }},
{ &hf_rtmpt_handshake_c1,
{ "Handshake data", "rtmpt.handshake.c1", FT_BYTES, BASE_NONE,
NULL, 0x0, "RTMPT Handshake C1", HFILL }},
{ &hf_rtmpt_handshake_s1,
{ "Handshake data", "rtmpt.handshake.s1", FT_BYTES, BASE_NONE,
NULL, 0x0, "RTMPT Handshake S1", HFILL }},
{ &hf_rtmpt_handshake_c2,
{ "Handshake data", "rtmpt.handshake.c2", FT_BYTES, BASE_NONE,
NULL, 0x0, "RTMPT Handshake C2", HFILL }},
{ &hf_rtmpt_handshake_s2,
{ "Handshake data", "rtmpt.handshake.s2", FT_BYTES, BASE_NONE,
NULL, 0x0, "RTMPT Handshake S2", HFILL }},
/* RTMP chunk/packet header */
{ &hf_rtmpt_header_format,
{ "Format", "rtmpt.header.format", FT_UINT8, BASE_DEC,
NULL, 0xC0, "RTMPT Basic Header format", HFILL }},
{ &hf_rtmpt_header_csid,
{ "Chunk Stream ID", "rtmpt.header.csid", FT_UINT8, BASE_DEC,
NULL, 0x3F, "RTMPT Basic Header chunk stream ID", HFILL }},
{ &hf_rtmpt_header_timestamp,
{ "Timestamp", "rtmpt.header.timestamp", FT_UINT24, BASE_DEC,
NULL, 0x0, "RTMPT Message Header timestamp", HFILL }},
{ &hf_rtmpt_header_timestamp_delta,
{ "Timestamp delta", "rtmpt.header.timestampdelta", FT_UINT24, BASE_DEC,
NULL, 0x0, "RTMPT Message Header timestamp delta", HFILL }},
{ &hf_rtmpt_header_body_size,
{ "Body size", "rtmpt.header.bodysize", FT_UINT24, BASE_DEC,
NULL, 0x0, "RTMPT Message Header body size", HFILL }},
{ &hf_rtmpt_header_typeid,
{ "Type ID", "rtmpt.header.typeid", FT_UINT8, BASE_HEX,
VALS(rtmpt_opcode_vals), 0x0, "RTMPT Message Header type ID", HFILL }},
{ &hf_rtmpt_header_streamid,
{ "Stream ID", "rtmpt.header.streamid", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT Header stream ID", HFILL }},
{ &hf_rtmpt_header_ets,
{ "Extended timestamp", "rtmpt.header.ets", FT_UINT24, BASE_DEC,
NULL, 0x0, "RTMPT Message Header extended timestamp", HFILL }},
/* Stream Control Messages */
{ &hf_rtmpt_scm_chunksize,
{ "Chunk size", "rtmpt.scm.chunksize", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT SCM chunk size", HFILL }},
{ &hf_rtmpt_scm_csid,
{ "Chunk stream ID", "rtmpt.scm.csid", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT SCM chunk stream ID", HFILL }},
{ &hf_rtmpt_scm_seq,
{ "Sequence number", "rtmpt.scm.seq", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT SCM acknowledgement sequence number", HFILL }},
{ &hf_rtmpt_scm_was,
{ "Window acknowledgement size", "rtmpt.scm.was", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT SCM window acknowledgement size", HFILL }},
{ &hf_rtmpt_scm_limittype,
{ "Limit type", "rtmpt.scm.limittype", FT_UINT8, BASE_DEC,
VALS(rtmpt_limit_vals), 0x0, "RTMPT SCM window acknowledgement size", HFILL }},
/* User Control Messages */
{ &hf_rtmpt_ucm_eventtype,
{ "Event type", "rtmpt.ucm.eventtype", FT_UINT16, BASE_DEC,
VALS(rtmpt_ucm_vals), 0x0, "RTMPT UCM event type", HFILL }},
/* Frame links */
{ &hf_rtmpt_function_call,
{ "Response to this call in frame", "rtmpt.function.call", FT_FRAMENUM, BASE_NONE,
NULL, 0x0, "RTMPT function call", HFILL }},
{ &hf_rtmpt_function_response,
{ "Call for this response in frame", "rtmpt.function.response", FT_FRAMENUM, BASE_NONE,
NULL, 0x0, "RTMPT function response", HFILL }},
/* Audio packets */
{ &hf_rtmpt_audio_control,
{ "Control", "rtmpt.audio.control", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_rtmpt_audio_is_ex_header,
{ "IsExAudioHeader", "rtmpt.audio.is_ex_header", FT_UINT8, BASE_DEC,
NULL, 0x90, "RTMPT IsExHeader flag introduced in enhanced RTMP", HFILL } },
{ &hf_rtmpt_audio_multitrack_control,
{ "Audio multitrack control", "rtmpt.audio.multitrack.control", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL } },
{ &hf_rtmpt_audio_multitrack_type,
{ "Audio multitrack type", "rtmpt.audio.multitrack.type", FT_UINT8, BASE_HEX,
VALS(rtmpt_av_multitrack_types), 0x0f, NULL, HFILL } },
{ &hf_rtmpt_audio_multitrack_packet_type,
{ "Audio multitrack packet type", "rtmpt.audio.multitrack.track.packet_type", FT_UINT8, BASE_HEX,
VALS(rtmpt_audio_packet_types), 0xf0, NULL, HFILL } },
{ &hf_rtmpt_audio_packet_type,
{ "Audio packet type", "rtmpt.audio.packet_type", FT_UINT8, BASE_HEX,
VALS(rtmpt_audio_packet_types), 0x0f, NULL, HFILL } },
{ &hf_rtmpt_audio_fourcc,
{ "FourCC", "rtmpt.audio.fourcc", FT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL } },
{ &hf_rtmpt_audio_track_id,
{ "Track ID", "rtmpt.audio.multitrack.track.id", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL } },
{ &hf_rtmpt_audio_track_length,
{ "Track length", "rtmpt.audio.multitrack.track.length", FT_UINT24, BASE_DEC,
NULL, 0x0, NULL, HFILL } },
{ &hf_rtmpt_audio_format,
{ "Format", "rtmpt.audio.format", FT_UINT8, BASE_DEC,
VALS(rtmpt_audio_codecs), 0xf0, NULL, HFILL }},
{ &hf_rtmpt_audio_rate,
{ "Sample rate", "rtmpt.audio.rate", FT_UINT8, BASE_DEC,
VALS(rtmpt_audio_rates), 0x0c, NULL, HFILL }},
{ &hf_rtmpt_audio_size,
{ "Sample size", "rtmpt.audio.size", FT_UINT8, BASE_DEC,
VALS(rtmpt_audio_sizes), 0x02, NULL, HFILL }},
{ &hf_rtmpt_audio_type,
{ "Channels", "rtmpt.audio.type", FT_UINT8, BASE_DEC,
VALS(rtmpt_audio_types), 0x01, NULL, HFILL }},
{ &hf_rtmpt_audio_data,
{ "Audio data", "rtmpt.audio.data", FT_BYTES, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
/* Video packets */
{ &hf_rtmpt_video_control,
{ "Control", "rtmpt.video.control", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_rtmpt_video_multitrack_control,
{ "Video multitrack control", "rtmpt.video.multitrack.control", FT_UINT8, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_rtmpt_video_is_ex_header,
{ "IsExVideoHeader", "rtmpt.video.is_ex_header", FT_UINT8, BASE_DEC,
NULL, 0x80, "RTMPT IsExHeader flag introduced in enhanced RTMP", HFILL }},
{ &hf_rtmpt_video_type,
{ "Video type", "rtmpt.video.type", FT_UINT8, BASE_DEC,
VALS(rtmpt_video_types), 0x70, NULL, HFILL }},
{ &hf_rtmpt_video_command,
{ "Video command", "rtmpt.video.command", FT_UINT8, BASE_DEC,
VALS(rtmpt_video_commands), 0x0, NULL, HFILL}},
{ &hf_rtmpt_video_format,
{ "Format", "rtmpt.video.format", FT_UINT8, BASE_DEC,
VALS(rtmpt_video_codecs), 0x0f, NULL, HFILL }},
{ &hf_rtmpt_video_packet_type,
{ "Video packet type", "rtmpt.video.packet_type", FT_UINT8, BASE_DEC,
VALS(rtmpt_video_packet_types), 0x0f, NULL, HFILL }},
{ &hf_rtmpt_video_multitrack_type,
{ "Video multitrack type", "rtmpt.video.multitrack.type", FT_UINT8, BASE_DEC,
VALS(rtmpt_av_multitrack_types), 0xf0, NULL, HFILL } },
{ &hf_rtmpt_video_multitrack_packet_type,
{ "Video multitrack packet type", "rtmpt.video.multitrack.packet_type", FT_UINT8, BASE_DEC,
VALS(rtmpt_video_packet_types), 0x0f, NULL, HFILL } },
{ &hf_rtmpt_video_fourcc,
{ "FourCC", "rtmpt.video.fourcc", FT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_rtmpt_video_track_id,
{ "Track ID", "rtmpt.video.multitrack.track.id", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL } },
{ &hf_rtmpt_video_track_length,
{ "Track length", "rtmpt.video.multitrack.track.length", FT_UINT24, BASE_DEC,
NULL, 0x0, NULL, HFILL } },
{ &hf_rtmpt_video_data,
{ "Video data", "rtmpt.video.data", FT_BYTES, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
/* Aggregate packets */
{ &hf_rtmpt_tag_type,
{ "Type", "rtmpt.tag.type", FT_UINT8, BASE_DEC,
VALS(rtmpt_tag_vals), 0x0, "RTMPT Aggregate tag type", HFILL }},
{ &hf_rtmpt_tag_datasize,
{ "Data size", "rtmpt.tag.datasize", FT_UINT24, BASE_DEC,
NULL, 0x0, "RTMPT Aggregate tag data size", HFILL }},
{ &hf_rtmpt_tag_timestamp,
{ "Timestamp", "rtmpt.tag.timestamp", FT_UINT24, BASE_DEC,
NULL, 0x0, "RTMPT Aggregate tag timestamp", HFILL }},
{ &hf_rtmpt_tag_ets,
{ "Timestamp Extended", "rtmpt.tag.ets", FT_UINT8, BASE_DEC,
NULL, 0x0, "RTMPT Aggregate tag timestamp extended", HFILL }},
{ &hf_rtmpt_tag_streamid,
{ "Stream ID", "rtmpt.tag.streamid", FT_UINT24, BASE_DEC,
NULL, 0x0, "RTMPT Aggregate tag stream ID", HFILL }},
{ &hf_rtmpt_tag_tagsize,
{ "Previous tag size", "rtmpt.tag.tagsize", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT Aggregate previous tag size", HFILL }}
};
static int *ett[] = {
&ett_rtmpt,
&ett_rtmpt_handshake,
&ett_rtmpt_header,
&ett_rtmpt_body,
&ett_rtmpt_ucm,
&ett_rtmpt_audio_control,
&ett_rtmpt_video_control,
&ett_rtmpt_audio_multitrack_control,
&ett_rtmpt_audio_multitrack_track,
&ett_rtmpt_video_multitrack_control,
&ett_rtmpt_video_multitrack_track,
&ett_rtmpt_tag,
&ett_rtmpt_tag_data
};
module_t *rtmpt_module;
proto_rtmpt = proto_register_protocol("Real Time Messaging Protocol", "RTMPT", "rtmpt");
proto_register_field_array(proto_rtmpt, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
rtmpt_tcp_handle = register_dissector("rtmpt.tcp", dissect_rtmpt_tcp, proto_rtmpt);
rtmpt_http_handle = register_dissector("rtmpt.http", dissect_rtmpt_http, proto_rtmpt);
rtmpt_module = prefs_register_protocol(proto_rtmpt, NULL);
/* XXX: This desegment preference doesn't do anything */
prefs_register_bool_preference(rtmpt_module, "desegment",
"Reassemble RTMPT messages spanning multiple TCP segments",
"Whether the RTMPT dissector should reassemble messages spanning multiple TCP segments."
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\""
" in the TCP protocol settings.",
&rtmpt_desegment);
prefs_register_obsolete_preference(rtmpt_module, "max_packet_size");
prefs_register_uint_preference(rtmpt_module, "default_chunk_size",
"Default chunk size",
"Chunk size to use for connections where the initial handshake is missing,"
" i.e. are already in progress at the beginning of the capture file.",
10, &rtmpt_default_chunk_size);
}
void
proto_register_amf(void)
{
static hf_register_info hf[] = {
{ &hf_amf_version,
{ "AMF version", "amf.version", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_header_count,
{ "Header count", "amf.header_count", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_header_name,
{ "Name", "amf.header.name", FT_UINT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_header_must_understand,
{ "Must understand", "amf.header.must_understand", FT_BOOLEAN, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_header_length,
{ "Length", "amf.header.length", FT_UINT32, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
#if 0
{ &hf_amf_header_value_type,
{ "Value type", "amf.header.value_type", FT_UINT32, BASE_HEX,
VALS(rtmpt_type_vals), 0x0, NULL, HFILL }},
#endif
{ &hf_amf_message_count,
{ "Message count", "amf.message_count", FT_UINT16, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_message_target_uri,
{ "Target URI", "amf.message.target_uri", FT_UINT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_message_response_uri,
{ "Response URI", "amf.message.response_uri", FT_UINT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_message_length,
{ "Length", "amf.message.length", FT_UINT32, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
/* AMF basic types */
{ &hf_amf_amf0_type,
{ "AMF0 type", "amf.amf0_type", FT_UINT8, BASE_HEX,
VALS(amf0_type_vals), 0x0, NULL, HFILL }},
{ &hf_amf_amf3_type,
{ "AMF3 type", "amf.amf3_type", FT_UINT8, BASE_HEX,
VALS(amf3_type_vals), 0x0, NULL, HFILL }},
{ &hf_amf_number,
{ "Number", "amf.number", FT_DOUBLE, BASE_NONE,
NULL, 0x0, "AMF number", HFILL }},
{ &hf_amf_integer,
{ "Integer", "amf.integer", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT AMF3 integer", HFILL }},
{ &hf_amf_boolean,
{ "Boolean", "amf.boolean", FT_BOOLEAN, BASE_NONE,
NULL, 0x0, "AMF boolean", HFILL }},
{ &hf_amf_stringlength,
{ "String length", "amf.stringlength", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF string length", HFILL }},
{ &hf_amf_string,
{ "String", "amf.string", FT_STRING, BASE_NONE,
NULL, 0x0, "AMF string", HFILL }},
{ &hf_amf_string_reference,
{ "String reference", "amf.string_reference", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT AMF3 string reference", HFILL }},
{ &hf_amf_object_reference,
{ "Object reference", "amf.object_reference", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF object reference", HFILL }},
{ &hf_amf_date,
{ "Date", "amf.date", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
NULL, 0x0, "AMF date", HFILL }},
#if 0
{ &hf_amf_longstringlength,
{ "String length", "amf.longstringlength", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF long string length", HFILL }},
#endif
{ &hf_amf_longstring,
{ "Long string", "amf.longstring", FT_STRING, BASE_NONE,
NULL, 0x0, "AMF long string", HFILL }},
{ &hf_amf_xml_doc,
{ "XML document", "amf.xml_doc", FT_STRING, BASE_NONE,
NULL, 0x0, "AMF XML document", HFILL }},
{ &hf_amf_xmllength,
{ "XML text length", "amf.xmllength", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF E4X XML length", HFILL }},
{ &hf_amf_xml,
{ "XML", "amf.xml", FT_STRING, BASE_NONE,
NULL, 0x0, "AMF E4X XML", HFILL }},
{ &hf_amf_int64,
{ "Int64", "amf.int64", FT_INT64, BASE_DEC,
NULL, 0x0, "AMF int64", HFILL }},
{ &hf_amf_bytearraylength,
{ "ByteArray length", "amf.bytearraylength", FT_UINT32, BASE_DEC,
NULL, 0x0, "RTMPT AMF3 ByteArray length", HFILL }},
{ &hf_amf_bytearray,
{ "ByteArray", "amf.bytearray", FT_BYTES, BASE_NONE,
NULL, 0x0, "RTMPT AMF3 ByteArray", HFILL }},
/* AMF object types and subfields of the object types */
{ &hf_amf_object,
{ "Object", "amf.object", FT_NONE, BASE_NONE,
NULL, 0x0, "AMF object", HFILL }},
{ &hf_amf_traitcount,
{ "Trait count", "amf.traitcount", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF count of traits for an object", HFILL }},
{ &hf_amf_classnamelength,
{ "Class name length", "amf.classnamelength", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF class name length", HFILL }},
{ &hf_amf_classname,
{ "Class name", "amf.classname", FT_STRING, BASE_NONE,
NULL, 0x0, "AMF class name", HFILL }},
{ &hf_amf_membernamelength,
{ "Member name length", "amf.membernamelength", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF member name length", HFILL }},
{ &hf_amf_membername,
{ "Member name", "amf.membername", FT_STRING, BASE_NONE,
NULL, 0x0, "AMF member name", HFILL }},
{ &hf_amf_trait_reference,
{ "Trait reference", "amf.trait_reference", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF trait reference", HFILL }},
{ &hf_amf_ecmaarray,
{ "ECMA array", "amf.ecmaarray", FT_NONE, BASE_NONE,
NULL, 0x0, "AMF ECMA array", HFILL }},
{ &hf_amf_strictarray,
{ "Strict array", "amf.strictarray", FT_NONE, BASE_NONE,
NULL, 0x0, "AMF strict array", HFILL }},
{ &hf_amf_array,
{ "Array", "amf.array", FT_NONE, BASE_NONE,
NULL, 0x0, "RTMPT AMF3 array", HFILL }},
{ &hf_amf_arraylength,
{ "Array length", "amf.arraylength", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF array length", HFILL }},
{ &hf_amf_arraydenselength,
{ "Length of dense portion", "amf.arraydenselength", FT_UINT32, BASE_DEC,
NULL, 0x0, "AMF length of dense portion of array", HFILL }},
{ &hf_amf_end_of_object_marker,
{ "End Of Object Marker", "amf.end_of_object_marker", FT_NONE, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_end_of_associative_part,
{ "End of associative part", "amf.end_of_associative_part", FT_NONE, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_amf_end_of_dynamic_members,
{ "End Of dynamic members", "amf.end_of_dynamic_members", FT_NONE, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
};
static ei_register_info ei[] = {
{ &ei_amf_loop, { "amf.loop", PI_MALFORMED, PI_ERROR, "Loop in AMF dissection", EXPFILL }}
};
static int *ett[] = {
&ett_amf,
&ett_amf_headers,
&ett_amf_messages,
&ett_amf_value,
&ett_amf_property,
&ett_amf_string,
&ett_amf_array_element,
&ett_amf_traits,
&ett_amf_trait_member,
};
expert_module_t* expert_amf;
proto_amf = proto_register_protocol("Action Message Format", "AMF", "amf");
proto_register_field_array(proto_amf, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_amf = expert_register_protocol(proto_amf);
expert_register_field_array(expert_amf, ei, array_length(ei));
amf_handle = register_dissector("amf", dissect_amf, proto_amf);
}
void
proto_reg_handoff_rtmpt(void)
{
heur_dissector_add("tcp", dissect_rtmpt_heur, "RTMPT over TCP", "rtmpt_tcp", proto_rtmpt, HEURISTIC_DISABLE);
dissector_add_uint_with_preference("tcp.port", RTMP_PORT, rtmpt_tcp_handle);
dissector_add_string("media_type", "application/x-fcs", rtmpt_http_handle);
dissector_add_string("media_type", "application/x-amf", amf_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=8 tabstop=8 expandtab:
* :indentSize=8:tabSize=8:noTabs=true:
*/
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