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wireshark/packet-iax2.c

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/*
* packet-iax2.c
*
* Routines for IAX2 packet disassembly
* By Alastair Maw <asterisk@almaw.com>
* Copyright 2003 Alastair Maw
*
* IAX2 is a VoIP protocol for the open source PBX Asterisk. Please see
* http://www.asterisk.org for more information.
*
* $Id: packet-iax2.c,v 1.8 2004/06/30 18:47:27 ulfl Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. This program is distributed in the hope
* that it will be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details. You
* should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <epan/circuit.h>
#include <epan/packet.h>
#include <epan/to_str.h>
#include "packet-iax2.h"
#include "iax2_codec_type.h"
#define IAX2_PORT 4569
#define PROTO_TAG_IAX2 "IAX2"
/* #define DEBUG_HASHING */
/* Ethereal ID of the IAX2 protocol */
static int proto_iax2 = -1;
/* The following hf_* variables are used to hold the ethereal IDs of
* our header fields; they are filled out when we call
* proto_register_field_array() in proto_register_iax2()
*/
static int hf_iax2_packet_type = -1;
static int hf_iax2_retransmission = -1;
static int hf_iax2_scallno = -1;
static int hf_iax2_dcallno = -1;
static int hf_iax2_ts = -1;
static int hf_iax2_minits = -1;
static int hf_iax2_minividts = -1;
static int hf_iax2_minividmarker = -1;
static int hf_iax2_oseqno = -1;
static int hf_iax2_iseqno = -1;
static int hf_iax2_type = -1;
static int hf_iax2_csub = -1;
static int hf_iax2_cmd_csub = -1;
static int hf_iax2_iax_csub = -1;
static int hf_iax2_voice_csub = -1;
static int hf_iax2_voice_codec = -1;
static int hf_iax2_video_csub = -1;
static int hf_iax2_video_codec = -1;
static int hf_iax2_marker = -1;
static int hf_iax2_cap_g723_1 = -1;
static int hf_iax2_cap_gsm = -1;
static int hf_iax2_cap_ulaw = -1;
static int hf_iax2_cap_alaw = -1;
static int hf_iax2_cap_g726 = -1;
static int hf_iax2_cap_adpcm = -1;
static int hf_iax2_cap_slinear = -1;
static int hf_iax2_cap_lpc10 = -1;
static int hf_iax2_cap_g729a = -1;
static int hf_iax2_cap_speex = -1;
static int hf_iax2_cap_ilbc = -1;
static int hf_iax2_cap_jpeg = -1;
static int hf_iax2_cap_png = -1;
static int hf_iax2_cap_h261 = -1;
static int hf_iax2_cap_h263 = -1;
static int hf_IAX_IE_APPARENTADDR_SINFAMILY = -1;
static int hf_IAX_IE_APPARENTADDR_SINPORT = -1;
static int hf_IAX_IE_APPARENTADDR_SINADDR = -1;
static int hf_IAX_IE_APPARENTADDR_SINZERO = -1;
static int hf_IAX_IE_CALLED_NUMBER = -1;
static int hf_IAX_IE_CALLING_NUMBER = -1;
static int hf_IAX_IE_CALLING_ANI = -1;
static int hf_IAX_IE_CALLING_NAME = -1;
static int hf_IAX_IE_CALLED_CONTEXT = -1;
static int hf_IAX_IE_USERNAME = -1;
static int hf_IAX_IE_PASSWORD = -1;
static int hf_IAX_IE_CAPABILITY = -1;
static int hf_IAX_IE_FORMAT = -1;
static int hf_IAX_IE_LANGUAGE = -1;
static int hf_IAX_IE_VERSION = -1;
static int hf_IAX_IE_ADSICPE = -1;
static int hf_IAX_IE_DNID = -1;
static int hf_IAX_IE_AUTHMETHODS = -1;
static int hf_IAX_IE_CHALLENGE = -1;
static int hf_IAX_IE_MD5_RESULT = -1;
static int hf_IAX_IE_RSA_RESULT = -1;
static int hf_IAX_IE_REFRESH = -1;
static int hf_IAX_IE_DPSTATUS = -1;
static int hf_IAX_IE_CALLNO = -1;
static int hf_IAX_IE_CAUSE = -1;
static int hf_IAX_IE_IAX_UNKNOWN = -1;
static int hf_IAX_IE_MSGCOUNT = -1;
static int hf_IAX_IE_AUTOANSWER = -1;
static int hf_IAX_IE_MUSICONHOLD = -1;
static int hf_IAX_IE_TRANSFERID = -1;
static int hf_IAX_IE_RDNIS = -1;
static int hf_IAX_IE_DATAFORMAT = -1;
static int hf_IAX_IE_UNKNOWN_BYTE = -1;
static int hf_IAX_IE_UNKNOWN_I16 = -1;
static int hf_IAX_IE_UNKNOWN_I32 = -1;
static int hf_IAX_IE_UNKNOWN_BYTES = -1;
/* These are the ids of the subtrees that we may be creating */
static gint ett_iax2 = -1;
static gint ett_iax2_full_mini_subtree = -1;
static gint ett_iax2_type = -1; /* Frame-type specific subtree */
static gint ett_iax2_ie = -1; /* single IE */
static gint ett_iax2_codecs = -1; /* capabilities IE */
static gint ett_iax2_ies_apparent_addr = -1; /* apparent address IE */
static dissector_handle_t data_handle;
/* data-call subdissectors, AST_DATAFORMAT_* */
static dissector_table_t iax2_dataformat_dissector_table;
/* voice/video call subdissectors, AST_FORMAT_* */
static dissector_table_t iax2_codec_dissector_table;
/* IAX2 Full-frame types */
static const value_string iax_frame_types[] = {
{0, "(0?)"},
{1, "DTMF"},
{2, "Voice"},
{3, "Video"},
{4, "Control"},
{5, "NULL"},
{6, "IAX"},
{7, "Text"},
{8, "Image"},
{0,NULL}
};
/* Subclasses for IAX packets */
static const value_string iax_iax_subclasses[] = {
{0, "(0?)"},
{1, "NEW"},
{2, "PING"},
{3, "PONG"},
{4, "ACK"},
{5, "HANGUP"},
{6, "REJECT"},
{7, "ACCEPT"},
{8, "AUTHREQ"},
{9, "AUTHREP"},
{10, "INVAL"},
{11, "LAGRQ"},
{12, "LAGRP"},
{13, "REGREQ"},
{14, "REGAUTH"},
{15, "REGACK"},
{16, "REGREJ"},
{17, "REGREL"},
{18, "VNAK"},
{19, "DPREQ"},
{20, "DPREP"},
{21, "DIAL"},
{22, "TXREQ"},
{23, "TXCNT"},
{24, "TXACC"},
{25, "TXREADY"},
{26, "TXREL"},
{27, "TXREJ"},
{28, "QUELCH"},
{29, "UNQULCH"},
{30, "POKE"},
{31, "PAGE"},
{32, "MWI"},
{33, "UNSUPPORTED"},
{34, "TRANSFER"},
{0,NULL}
};
/* Subclassess for Control packets */
static const value_string iax_cmd_subclasses[] = {
{0, "(0?)"},
{1, "HANGUP"},
{2, "RING"},
{3, "RINGING"},
{4, "ANSWER"},
{5, "BUSY"},
{6, "TKOFFHK"},
{7, "OFFHOOK"},
{0xFF, "stop sounds"}, /* sent by app_dial, and not much else */
{0,NULL}
};
/* Information elements */
static const value_string iax_ies_type[] = {
{IAX_IE_CALLED_NUMBER, "Number/extension being called"},
{IAX_IE_CALLING_NUMBER, "Calling number"},
{IAX_IE_CALLING_ANI, "Calling number ANI for billing"},
{IAX_IE_CALLING_NAME, "Name of caller"},
{IAX_IE_CALLED_CONTEXT, "Context for number"},
{IAX_IE_USERNAME, "Username (peer or user) for authentication"},
{IAX_IE_PASSWORD, "Password for authentication"},
{IAX_IE_CAPABILITY, "Actual codec capability"},
{IAX_IE_FORMAT, "Desired codec format"},
{IAX_IE_LANGUAGE, "Desired language"},
{IAX_IE_VERSION, "Protocol version"},
{IAX_IE_ADSICPE, "CPE ADSI capability"},
{IAX_IE_DNID, "Originally dialed DNID"},
{IAX_IE_AUTHMETHODS, "Authentication method(s)"},
{IAX_IE_CHALLENGE, "Challenge data for MD5/RSA"},
{IAX_IE_MD5_RESULT, "MD5 challenge result"},
{IAX_IE_RSA_RESULT, "RSA challenge result"},
{IAX_IE_APPARENT_ADDR, "Apparent address of peer"},
{IAX_IE_REFRESH, "When to refresh registration"},
{IAX_IE_DPSTATUS, "Dialplan status"},
{IAX_IE_CALLNO, "Call number of peer"},
{IAX_IE_CAUSE, "Cause"},
{IAX_IE_IAX_UNKNOWN, "Unknown IAX command"},
{IAX_IE_MSGCOUNT, "How many messages waiting"},
{IAX_IE_AUTOANSWER, "Request auto-answering"},
{IAX_IE_MUSICONHOLD, "Request musiconhold with QUELCH"},
{IAX_IE_TRANSFERID, "Transfer Request Identifier"},
{IAX_IE_RDNIS, "Referring DNIS"},
{IAX_IE_PROVISIONING, "Provisioning info"},
{IAX_IE_AESPROVISIONING, "AES Provisioning info"},
{IAX_IE_DATETIME,"Date/Time"},
{IAX_IE_DATAFORMAT, "Data call format"},
{0,NULL}
};
static const value_string codec_types[] = {
{AST_FORMAT_G723_1, "G.723.1 compression"},
{AST_FORMAT_GSM, "GSM compression"},
{AST_FORMAT_ULAW, "Raw mu-law data (G.711)"},
{AST_FORMAT_ALAW, "Raw A-law data (G.711)"},
{AST_FORMAT_G726, "ADPCM (G.726, 32kbps)"},
{AST_FORMAT_ADPCM, "ADPCM (IMA)"},
{AST_FORMAT_SLINEAR, "Raw 16-bit Signed Linear (8000 Hz) PCM"},
{AST_FORMAT_LPC10, "LPC10, 180 samples/frame"},
{AST_FORMAT_G729A, "G.729a Audio"},
{AST_FORMAT_SPEEX, "SpeeX Free Compression"},
{AST_FORMAT_ILBC, "iLBC Free Compression"},
{AST_FORMAT_JPEG, "JPEG Images"},
{AST_FORMAT_PNG, "PNG Images"},
{AST_FORMAT_H261, "H.261 Video"},
{AST_FORMAT_H263, "H.263 Video"},
{0,NULL}
};
static const value_string iax_dataformats[] = {
{AST_DATAFORMAT_NULL, "N/A (analogue call?)"},
{AST_DATAFORMAT_V110, "ITU-T V.110 rate adaption"},
{AST_DATAFORMAT_H223_H245,"ITU-T H.223/H.245"},
{0,NULL}
};
typedef enum {
IAX2_MINI_VOICE_PACKET,
IAX2_FULL_PACKET,
IAX2_MINI_VIDEO_PACKET,
IAX2_META_PACKET
} packet_type;
static const value_string iax_packet_types[] = {
{IAX2_FULL_PACKET, "Full packet"},
{IAX2_MINI_VOICE_PACKET, "Mini voice packet"},
{IAX2_MINI_VIDEO_PACKET, "Mini video packet"},
{IAX2_META_PACKET, "Meta packet"},
{0,NULL}
};
/* ************************************************************************* */
/* In order to track IAX calls, we have a hash table which maps
* {addr,port type,port,call} to a unique circuit id.
*
* Each call has two such circuits associated with it (a forward and a
* reverse circuit, where 'forward' is defined as the direction the NEW
* packet went in), and we maintain an iax_call_data structure for each
* call, attached to both circuits with circuit_add_proto_data.
*
* Because {addr,port type,port,call} quadruplets can be reused
* (Asterisk reuses call numbers), circuit ids aren't unique to
* individual calls and we treat NEW packets somewhat specially. When we
* get such a packet, we see if there are any calls with a matching
* circuit id, and make sure that its circuits are marked as ended
* before that packet.
*
* A second complication is that we only know one quadruplet at the time
* the NEW packet is processed: there is therefore cunningness in
* iax_lookup_circuit_details() to look for replies to NEW packets and
* create the reverse circuit.
*/
/* start with a hash of {addr,port type,port,call}->{id} */
typedef struct {
address addr;
port_type ptype;
guint32 port;
guint32 callno;
} iax_circuit_key;
/* tables */
static GHashTable *iax_circuit_hashtab = NULL;
static GMemChunk *iax_circuit_keys = NULL;
static GMemChunk *iax_circuit_vals = NULL;
static guint circuitcount = 0;
/* the number of keys and values to reserve space for in each memory chunk.
We assume we won't be tracking many calls at once so this is quite low.
*/
#define IAX_INIT_PACKET_COUNT 10
#ifdef DEBUG_HASHING
static gchar *key_to_str( const iax_circuit_key *key )
{
static int i=0;
static gchar *strp, str[3][80];
i++;
if(i>=3){
i=0;
}
strp=str[i];
/* why doesn't address_to_str take a const pointer?
cast the warnings into oblivion. */
sprintf(strp,"{%s:%i,%i}",
address_to_str((address *)&key->addr),
key->port,
key->callno);
return strp;
}
#endif
/* Hash Functions */
static gint iax_circuit_equal(gconstpointer v, gconstpointer w)
{
const iax_circuit_key *v1 = (const iax_circuit_key *)v;
const iax_circuit_key *v2 = (const iax_circuit_key *)w;
gint result;
result = ( ADDRESSES_EQUAL(&(v1->addr), &(v2->addr)) &&
v1->ptype == v2->ptype &&
v1->port == v2->port &&
v1->callno== v2->callno);
#ifdef DEBUG_HASHING
g_message( "+++ Comparing for equality: %s, %s: %u",key_to_str(v1), key_to_str(v2), result);
#endif
return result;;
}
static guint iax_circuit_hash (gconstpointer v)
{
const iax_circuit_key *key = (const iax_circuit_key *)v;
guint hash_val;
int i;
hash_val = 0;
for (i = 0; i < key->addr.len; i++)
hash_val += (guint)(key->addr.data[i]);
hash_val += (guint)(key->ptype);
hash_val += (guint)(key->port);
hash_val += (guint)(key->callno);
#ifdef DEBUG_HASHING
g_message( "+++ Hashing key: %s, result %#x", key_to_str(key), hash_val );
#endif
return (guint) hash_val;
}
static guint iax_circuit_lookup(const address *address,
port_type ptype,
guint32 port,
guint32 callno)
{
iax_circuit_key key;
guint32 *circuit_id_p;
key.addr = *address;
key.ptype = ptype;
key.port = port;
key.callno = callno;
#ifdef DEBUG_HASHING
g_message( "+++ looking up key: %s", key_to_str(&key));
#endif
circuit_id_p = g_hash_table_lookup( iax_circuit_hashtab, &key);
if( ! circuit_id_p ) {
iax_circuit_key *new_key;
new_key = g_mem_chunk_alloc(iax_circuit_keys);
COPY_ADDRESS(&new_key->addr, address);
new_key->ptype = ptype;
new_key->port = port;
new_key->callno = callno;
circuit_id_p = g_mem_chunk_alloc(iax_circuit_vals);
*circuit_id_p = ++circuitcount;
g_hash_table_insert(iax_circuit_hashtab, new_key, circuit_id_p);
}
#ifdef DEBUG_HASHING
g_message( "+++ Id: %u", *circuit_id_p );
#endif
return *circuit_id_p;
}
/* ************************************************************************* */
/* This is our per-call data structure, which is attached to both the
* forward and reverse circuits.
*/
typedef struct iax_call_data {
/* For this data, src and dst are relative to the original direction under
which this call is stored. Obviously if the reversed flag is set true by
iax_find_call, src and dst are reversed relative to the direction the
actual source and destination of the data.
if the codec changes mid-call, we update it here; because we store a codec
number with each packet too, we handle going back to earlier packets
without problem.
*/
iax_dataformat_t dataformat;
guint32 src_codec, dst_codec;
guint32 src_vformat, dst_vformat;
guint forward_circuit_id;
guint reverse_circuit_id;
guint callno;
} iax_call_data;
static guint callcount = 0;
static GMemChunk *iax_call_datas = NULL;
static void iax_init_hash( void )
{
if (iax_circuit_hashtab)
g_hash_table_destroy(iax_circuit_hashtab);
if (iax_circuit_keys)
g_mem_chunk_destroy(iax_circuit_keys);
if (iax_circuit_vals)
g_mem_chunk_destroy(iax_circuit_vals);
if (iax_call_datas)
g_mem_chunk_destroy(iax_call_datas);
iax_circuit_hashtab = g_hash_table_new(iax_circuit_hash, iax_circuit_equal);
iax_circuit_keys = g_mem_chunk_create(iax_circuit_key,
2*IAX_INIT_PACKET_COUNT,
G_ALLOC_ONLY);
iax_circuit_vals = g_mem_chunk_create(iax_circuit_key,
2*IAX_INIT_PACKET_COUNT,
G_ALLOC_ONLY);
iax_call_datas = g_mem_chunk_create(iax_call_data,
IAX_INIT_PACKET_COUNT,
G_ALLOC_ONLY);
circuitcount = 0;
callcount = 0;
}
static iax_call_data *iax_lookup_circuit_details_from_dest( guint src_circuit_id,
guint dst_circuit_id,
guint framenum,
gboolean *reversed_p,
circuit_t **circuit_p)
{
circuit_t *dst_circuit;
iax_call_data * iax_call;
gboolean reversed = FALSE;
dst_circuit = find_circuit( CT_IAX2,
dst_circuit_id,
framenum );
if( !dst_circuit ) {
#ifdef DEBUG_HASHING
g_message( "++ destination circuit not found, must have missed NEW packet" );
#endif
return NULL;
}
#ifdef DEBUG_HASHING
g_message( "++ found destination circuit" );
#endif
iax_call = (iax_call_data *)circuit_get_proto_data(dst_circuit,proto_iax2);
/* there's no way we can create a CT_IAX2 circuit without adding
iax call data to it; assert this */
g_assert(iax_call);
if( dst_circuit_id == iax_call -> forward_circuit_id ) {
#ifdef DEBUG_HASHING
g_message( "++ destination circuit matches forward_circuit_id of call, "
"therefore packet is reversed" );
#endif
reversed = TRUE;
if( iax_call -> reverse_circuit_id == 0 ) {
circuit_t *rev_circuit;
/* we are going in the reverse direction, and this call
doesn't have a reverse circuit associated with it.
create one now. */
#ifdef DEBUG_HASHING
g_message( "++ reverse_circuit_id of call is zero, need to create a "
"new reverse circuit for this call" );
#endif
iax_call -> reverse_circuit_id = src_circuit_id;
rev_circuit = circuit_new(CT_IAX2,
src_circuit_id,
framenum );
circuit_add_proto_data(rev_circuit, proto_iax2, iax_call);
/* we should have already set up a subdissector for the forward
* circuit. we'll need to copy it to the reverse circuit. */
circuit_set_dissector(rev_circuit, circuit_get_dissector(dst_circuit));
#ifdef DEBUG_HASHING
g_message( "++ done" );
#endif
} else if( iax_call -> reverse_circuit_id != src_circuit_id ) {
g_warning( "IAX Packet %u from circuit ids %u->%u"
"conflicts with earlier call with circuit ids %u->%u",
framenum,
src_circuit_id,dst_circuit_id,
iax_call->forward_circuit_id,
iax_call->reverse_circuit_id);
return NULL;
}
} else if ( dst_circuit_id == iax_call -> reverse_circuit_id ) {
#ifdef DEBUG_HASHING
g_message( "++ destination circuit matches reverse_circuit_id of call, "
"therefore packet is forward" );
#endif
reversed = FALSE;
if( iax_call -> forward_circuit_id != src_circuit_id ) {
g_warning( "IAX Packet %u from circuit ids %u->%u"
"conflicts with earlier call with circuit ids %u->%u",
framenum,
src_circuit_id,dst_circuit_id,
iax_call->forward_circuit_id,
iax_call->reverse_circuit_id);
return NULL;
}
} else {
g_assert_not_reached();
}
if( circuit_p ) {
/* by now we've created a new circuit if one was necessary, or
bailed out if it looks like a conflict, and we should be able
to look up the source circuit without issue */
*circuit_p = find_circuit( CT_IAX2,
src_circuit_id,
framenum );
g_assert(*circuit_p);
}
if( reversed_p )
*reversed_p = reversed;
return iax_call;
}
/* looks up a circuit_t and an iax_call for this packet */
static iax_call_data *iax_lookup_circuit_details( packet_info *pinfo,
guint32 scallno,
guint32 dcallno,
gboolean *reversed_p,
circuit_t **circuit_p)
{
gboolean reversed = FALSE;
iax_call_data *iax_call = NULL;
guint src_circuit_id;
circuit_t *src_circuit = NULL;
#ifdef DEBUG_HASHING
g_message( "++ iax_lookup_circuit_details: Looking up circuit for frame %u, "
"from {%s:%u:%u} to {%s:%u:%u}", pinfo->fd->num,
address_to_str(&pinfo->src),pinfo->srcport,scallno,
address_to_str(&pinfo->dst),pinfo->destport,dcallno);
#endif
src_circuit_id = iax_circuit_lookup(&pinfo->src,pinfo->ptype,
pinfo->srcport,scallno);
/* the most reliable indicator of call is the destination callno, if
we have one */
if( dcallno != 0 ) {
guint dst_circuit_id;
#ifdef DEBUG_HASHING
g_message( "++ dcallno non-zero, looking up destination circuit" );
#endif
dst_circuit_id = iax_circuit_lookup(&pinfo->dst,pinfo->ptype,
pinfo->destport,dcallno);
iax_call = iax_lookup_circuit_details_from_dest(src_circuit_id, dst_circuit_id, pinfo->fd->num, &reversed, &src_circuit);
} else {
/* in all other circumstances, the source circuit should already
* exist: its absense indicates that we missed the all-important NEW
* packet.
*/
src_circuit = find_circuit( CT_IAX2,
src_circuit_id,
pinfo->fd->num );
if( src_circuit ) {
iax_call = (iax_call_data *)circuit_get_proto_data(src_circuit,proto_iax2);
/* there's no way we can create a CT_IAX2 circuit without adding
iax call data to it; assert this */
g_assert(iax_call);
if( src_circuit_id == iax_call -> forward_circuit_id )
reversed = FALSE;
else if ( src_circuit_id == iax_call -> reverse_circuit_id )
reversed = TRUE;
else {
/* there's also no way we can attach an iax_call_data to a circuit
without the circuit being either the forward or reverse circuit
for that call; assert this too.
*/
g_assert_not_reached();
}
}
}
if(src_circuit && iax_call) {
/* info for subdissectors. We always pass on the forward circuit,
* and steal the p2p_dir flag to indicate the direction */
pinfo -> ctype = CT_IAX2;
pinfo -> circuit_id = (guint32)iax_call->forward_circuit_id;
pinfo -> p2p_dir = reversed?P2P_DIR_RECV:P2P_DIR_SENT;
}
if(reversed_p)
*reversed_p = reversed;
if(circuit_p)
*circuit_p = src_circuit;
#ifdef DEBUG_HASHING
if( iax_call ) {
g_message( "++ Found call for packet: id %u, reversed=%c", iax_call->callno, reversed?'1':'0' );
} else {
g_message( "++ Call not found. Must have missed the NEW packet?" );
}
#endif
return iax_call;
}
/* handles a NEW packet by creating a new iax call and forward circuit.
the reverse circuit is not created until the ACK is received and
is created by iax_lookup_circuit_details. */
static iax_call_data *iax_new_circuit_details( packet_info *pinfo,
guint32 scallno,
circuit_t **circuit_p)
{
circuit_t *circuit;
iax_call_data *call;
guint circuit_id;
#ifdef DEBUG_HASHING
g_message( "+ new_circuit: Handling NEW packet, frame %u", pinfo->fd->num );
#endif
circuit_id = iax_circuit_lookup(&pinfo->src,pinfo->ptype,
pinfo->srcport,scallno);
circuit = circuit_new(CT_IAX2,
circuit_id,
pinfo->fd->num );
call = g_mem_chunk_alloc(iax_call_datas);
call -> dataformat = 0;
call -> src_codec = 0;
call -> dst_codec = 0;
call -> forward_circuit_id = circuit_id;
call -> reverse_circuit_id = 0;
call -> callno = ++callcount;
#ifdef DEBUG_HASHING
g_message( "+ new_circuit: Added new circuit for new call %u", call -> callno );
#endif
circuit_add_proto_data( circuit, proto_iax2, call );
if( circuit_p )
*circuit_p = circuit;
return call;
}
/* ************************************************************************* */
/* per-packet data */
typedef struct iax_packet_data {
iax_call_data *call_data;
guint32 codec;
} iax_packet_data;
static GMemChunk *iax_packets = NULL;
static iax_packet_data *iax_new_packet_data(iax_call_data *call)
{
iax_packet_data *p = g_mem_chunk_alloc(iax_packets);
p->call_data=call;
p->codec=0;
return p;
}
/* ************************************************************************* */
static guint32 dissect_fullpacket (tvbuff_t * tvb, guint32 offset,
guint16 scallno,
packet_info * pinfo,
proto_tree * iax2_tree,
proto_tree * main_tree);
static guint32 dissect_minipacket (tvbuff_t * tvb, guint32 offset,
guint16 scallno,
packet_info * pinfo,
proto_tree * iax2_tree,
proto_tree * main_tree);
static guint32 dissect_minivideopacket (tvbuff_t * tvb, guint32 offset,
guint16 scallno,
packet_info * pinfo,
proto_tree * iax2_tree,
proto_tree * main_tree);
static void dissect_payload(tvbuff_t *tvb, guint32 offset,
packet_info *pinfo, proto_tree *tree,
guint32 ts, gboolean video,
iax_packet_data *iax_packet);
static void
dissect_iax2 (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
proto_item *iax2_item = NULL;
proto_tree *iax2_tree = NULL;
proto_tree *full_mini_subtree = NULL;
guint32 offset = 0, len;
guint16 scallno = 0;
guint16 stmp;
packet_type type;
/* set up the protocol and info fields in the summary pane */
if (check_col (pinfo->cinfo, COL_PROTOCOL))
{
col_set_str (pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_IAX2);
}
if (check_col (pinfo->cinfo, COL_INFO))
{
col_clear (pinfo->cinfo, COL_INFO);
}
/* add the 'iax2' tree to the main tree */
if (tree)
{
iax2_item = proto_tree_add_item (tree, proto_iax2, tvb, offset, -1, FALSE);
iax2_tree = proto_item_add_subtree (iax2_item, ett_iax2);
}
stmp = tvb_get_ntohs(tvb, offset);
if( stmp == 0 ) {
/* starting with 0x0000 indicates either a mini video packet or a 'meta'
* packet, whatever that means */
offset+=2;
stmp = tvb_get_ntohs(tvb, offset);
if( stmp & 0x8000 ) {
/* mini video packet */
type = IAX2_MINI_VIDEO_PACKET;
scallno = stmp & 0x7FFF;
offset += 2;
}
else {
type = IAX2_META_PACKET;
}
} else {
/* The source call/fullpacket flag is common to both mini and full packets */
scallno = tvb_get_ntohs(tvb, offset);
offset += 2;
if( scallno & 0x8000 )
type = IAX2_FULL_PACKET;
else {
type = IAX2_MINI_VOICE_PACKET;
}
scallno &= 0x7FFF;
}
if( tree ) {
proto_item *full_mini_base;
full_mini_base = proto_tree_add_uint(iax2_tree, hf_iax2_packet_type, tvb, 0, offset, type);
full_mini_subtree = proto_item_add_subtree(full_mini_base, ett_iax2_full_mini_subtree);
if( scallno != 0 )
proto_tree_add_item (full_mini_subtree, hf_iax2_scallno, tvb, offset-2, 2, FALSE);
}
switch( type ) {
case IAX2_FULL_PACKET:
len = dissect_fullpacket( tvb, offset, scallno, pinfo, full_mini_subtree, tree );
break;
case IAX2_MINI_VOICE_PACKET:
len = dissect_minipacket( tvb, offset, scallno, pinfo, full_mini_subtree, tree );
break;
case IAX2_MINI_VIDEO_PACKET:
len = dissect_minivideopacket( tvb, offset, scallno, pinfo, full_mini_subtree, tree );
break;
case IAX2_META_PACKET:
/* not implemented yet */
len = 0;
break;
default:
len = 0;
}
/* update the 'length' of the main IAX2 header field so that it covers just the headers,
not the audio data. */
proto_item_set_len(iax2_item, len);
}
/* dissect the information elements in an IAX frame. Returns the updated offset */
static guint32 dissect_ies (tvbuff_t * tvb, guint32 offset,
proto_tree * iax_tree,
iax_call_data *iax_call_data )
{
proto_tree *sockaddr_tree = NULL;
proto_item *sockaddr_item = 0;
while (offset < tvb_reported_length (tvb)) {
int ies_type = tvb_get_guint8(tvb, offset);
int ies_len = tvb_get_guint8(tvb, offset + 1);
if( iax_tree ) {
proto_item *ti;
proto_tree *ies_tree;
ti = proto_tree_add_text(iax_tree, tvb, offset, ies_len+2,
"Information Element: %s (0x%02X)",
val_to_str(ies_type, iax_ies_type,
"Unknown information element"),
ies_type);
ies_tree = proto_item_add_subtree(ti, ett_iax2_ie);
proto_tree_add_text(ies_tree, tvb, offset, 1, "IE id: %s (0x%02X)",
val_to_str(ies_type, iax_ies_type, "Unknown"),
ies_type);
proto_tree_add_text(ies_tree, tvb, offset+1, 1, "Length: %u",ies_len);
switch (ies_type) {
case IAX_IE_CALLED_NUMBER:
proto_tree_add_item (ies_tree, hf_IAX_IE_CALLED_NUMBER, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_CALLING_NUMBER:
proto_tree_add_item (ies_tree, hf_IAX_IE_CALLING_NUMBER,
tvb, offset + 2, ies_len, FALSE);
break;
case IAX_IE_CALLING_ANI:
proto_tree_add_item (ies_tree, hf_IAX_IE_CALLING_ANI, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_CALLING_NAME:
proto_tree_add_item (ies_tree, hf_IAX_IE_CALLING_NAME, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_CALLED_CONTEXT:
proto_tree_add_item (ies_tree, hf_IAX_IE_CALLED_CONTEXT,
tvb, offset + 2, ies_len, FALSE);
break;
case IAX_IE_USERNAME:
proto_tree_add_item (ies_tree, hf_IAX_IE_USERNAME, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_PASSWORD:
proto_tree_add_item (ies_tree, hf_IAX_IE_PASSWORD, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_LANGUAGE:
proto_tree_add_item (ies_tree, hf_IAX_IE_LANGUAGE, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_DNID:
proto_tree_add_item (ies_tree, hf_IAX_IE_DNID, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_CHALLENGE:
proto_tree_add_item (ies_tree, hf_IAX_IE_CHALLENGE, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_MD5_RESULT:
proto_tree_add_item (ies_tree, hf_IAX_IE_MD5_RESULT, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_RSA_RESULT:
proto_tree_add_item (ies_tree, hf_IAX_IE_RSA_RESULT, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_RDNIS:
proto_tree_add_item (ies_tree, hf_IAX_IE_RDNIS, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_CAPABILITY:
{
proto_tree *codec_tree;
proto_item *codec_base;
codec_base =
proto_tree_add_item (ies_tree, hf_IAX_IE_CAPABILITY,
tvb, offset + 2, ies_len, FALSE);
codec_tree =
proto_item_add_subtree (codec_base, ett_iax2_codecs);
proto_tree_add_item(codec_tree, hf_iax2_cap_g723_1, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_gsm, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_ulaw, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_alaw, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_g726, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_adpcm, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_slinear, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_lpc10, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_g729a, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_speex, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_ilbc, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_jpeg, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_png, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_h261, tvb, offset + 2, ies_len, FALSE );
proto_tree_add_item(codec_tree, hf_iax2_cap_h263, tvb, offset + 2, ies_len, FALSE );
break;
}
case IAX_IE_FORMAT:
proto_tree_add_item (ies_tree, hf_IAX_IE_FORMAT, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_VERSION:
proto_tree_add_item (ies_tree, hf_IAX_IE_VERSION, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_ADSICPE:
proto_tree_add_item (ies_tree, hf_IAX_IE_ADSICPE, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_AUTHMETHODS:
proto_tree_add_item (ies_tree, hf_IAX_IE_AUTHMETHODS, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_APPARENT_ADDR:
sockaddr_item = proto_tree_add_text(ies_tree, tvb, offset + 2, 16, "Apparent Address");
sockaddr_tree = proto_item_add_subtree(sockaddr_item, ett_iax2_ies_apparent_addr);
proto_tree_add_item(sockaddr_tree, hf_IAX_IE_APPARENTADDR_SINADDR, tvb, offset + 6, 4, FALSE);
proto_tree_add_item(sockaddr_tree, hf_IAX_IE_APPARENTADDR_SINPORT, tvb, offset + 4, 2, FALSE);
break;
case IAX_IE_REFRESH:
proto_tree_add_item (ies_tree, hf_IAX_IE_REFRESH, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_DPSTATUS:
proto_tree_add_item (ies_tree, hf_IAX_IE_DPSTATUS, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_CALLNO:
proto_tree_add_item (ies_tree, hf_IAX_IE_CALLNO, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_CAUSE:
proto_tree_add_item (ies_tree, hf_IAX_IE_CAUSE, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_IAX_UNKNOWN:
proto_tree_add_item (ies_tree, hf_IAX_IE_IAX_UNKNOWN, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_MSGCOUNT:
proto_tree_add_item (ies_tree, hf_IAX_IE_MSGCOUNT, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_AUTOANSWER:
proto_tree_add_item (ies_tree, hf_IAX_IE_AUTOANSWER, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_MUSICONHOLD:
proto_tree_add_item (ies_tree, hf_IAX_IE_MUSICONHOLD, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_TRANSFERID:
proto_tree_add_item (ies_tree, hf_IAX_IE_TRANSFERID, tvb,
offset + 2, ies_len, FALSE);
break;
case IAX_IE_DATAFORMAT:
proto_tree_add_item (ies_tree, hf_IAX_IE_DATAFORMAT, tvb,
offset + 2, ies_len, FALSE);
if( iax_call_data )
iax_call_data -> dataformat = tvb_get_ntohl(tvb, offset+2);
break;
default:
{
switch(ies_len) {
case 1:
proto_tree_add_item( ies_tree, hf_IAX_IE_UNKNOWN_BYTE, tvb, offset+2, ies_len, FALSE );
break;
case 2:
proto_tree_add_item( ies_tree, hf_IAX_IE_UNKNOWN_I16, tvb, offset+2, ies_len, FALSE );
break;
case 4:
proto_tree_add_item( ies_tree, hf_IAX_IE_UNKNOWN_I32, tvb, offset+2, ies_len, FALSE );
break;
default:
proto_tree_add_item( ies_tree, hf_IAX_IE_UNKNOWN_BYTES, tvb, offset+2, ies_len, FALSE );
}
}
}
}
offset += ies_len + 2;
}
return offset;
}
static guint32 uncompress_subclass(guint8 csub)
{
/* If the SC_LOG flag is set, return 2^csub otherwise csub */
if (csub & 0x80) {
/* special case for 'compressed' -1 */
if (csub == 0xff)
return (guint32)-1;
else
return 1 << (csub & 0x1F);
}
else
return (guint32)csub;
}
static guint32
dissect_fullpacket (tvbuff_t * tvb, guint32 offset,
guint16 scallno,
packet_info * pinfo, proto_tree * iax2_tree,
proto_tree * main_tree)
{
guint32 retransmission = 0;
guint16 dcallno;
guint32 ts;
guint8 type;
guint8 csub;
guint32 codec;
proto_tree *packet_type_tree = NULL;
iax_call_data *iax_call;
iax_packet_data *iax_packet;
gboolean reversed;
gboolean rtp_marker;
circuit_t *circuit;
/*
* remove the top bit for retransmission detection
*/
dcallno = tvb_get_ntohs(tvb, offset);
retransmission = dcallno & 0x8000;
dcallno = dcallno & 0x7FFF;
ts = tvb_get_ntohl(tvb, offset+2);
type = tvb_get_guint8(tvb, offset + 8);
csub = tvb_get_guint8(tvb, offset + 9);
/* see if we've seen this packet before */
iax_packet = (iax_packet_data *)p_get_proto_data(pinfo->fd,proto_iax2);
if( !iax_packet ) {
/* if not, find or create an iax_call info structure for this IAX session. */
if( type == AST_FRAME_IAX && csub == IAX_COMMAND_NEW ) {
/* NEW packets start a new call */
iax_call = iax_new_circuit_details(pinfo,scallno,&circuit);
reversed = FALSE;
} else {
iax_call = iax_lookup_circuit_details(pinfo, scallno, dcallno,
&reversed, &circuit);
}
iax_packet = iax_new_packet_data(iax_call);
p_add_proto_data(pinfo->fd,proto_iax2,iax_packet);
} else {
iax_call = iax_packet->call_data;
}
if( iax2_tree ) {
proto_item *packet_type_base;
proto_tree_add_item (iax2_tree, hf_iax2_dcallno, tvb, offset, 2, FALSE );
proto_tree_add_boolean(iax2_tree, hf_iax2_retransmission, tvb, offset, 2, FALSE );
proto_tree_add_uint (iax2_tree, hf_iax2_ts, tvb, offset+2, 4, ts);
proto_tree_add_item (iax2_tree, hf_iax2_oseqno, tvb, offset+6, 1,
FALSE);
proto_tree_add_item (iax2_tree, hf_iax2_iseqno, tvb, offset+7, 1,
FALSE);
packet_type_base = proto_tree_add_uint (iax2_tree, hf_iax2_type, tvb,
offset+8, 1, type);
/* add the type-specific subtree */
packet_type_tree = proto_item_add_subtree (packet_type_base, ett_iax2_type);
}
/* add frame type to info line */
if (check_col (pinfo->cinfo, COL_INFO)) {
col_add_fstr (pinfo->cinfo, COL_INFO, "%s, source call# %d, timestamp %ums",
val_to_str (type, iax_frame_types, "Unknown (0x%02x)"),
scallno, ts);
}
switch( type ) {
case AST_FRAME_IAX:
/* add the subclass */
proto_tree_add_uint (packet_type_tree, hf_iax2_iax_csub, tvb,
offset+9, 1, csub);
offset += 10;
if (check_col (pinfo->cinfo, COL_INFO))
col_append_fstr (pinfo->cinfo, COL_INFO, " %s",
val_to_str (csub, iax_iax_subclasses, "unknown (0x%02x)"));
if (offset < tvb_reported_length (tvb)) {
offset += dissect_ies(tvb, offset, packet_type_tree, iax_call);
}
if( csub == IAX_COMMAND_NEW && circuit && iax_call ) {
/* if this is a data call, set up a subdissector for the circuit */
dissector_handle_t s;
s = dissector_get_port_handle(iax2_dataformat_dissector_table, iax_call -> dataformat );
circuit_set_dissector( circuit, s );
}
break;
case AST_FRAME_DTMF:
proto_tree_add_text (packet_type_tree, tvb, offset+9, 1, "DTMF digit: %c", csub);
offset += 10;
if (check_col (pinfo->cinfo, COL_INFO))
col_append_fstr (pinfo->cinfo, COL_INFO, " digit %c", csub );
break;
case AST_FRAME_CONTROL:
/* add the subclass */
proto_tree_add_uint (packet_type_tree, hf_iax2_cmd_csub, tvb,
offset+9, 1, csub);
offset += 10;
if (check_col (pinfo->cinfo, COL_INFO))
col_append_fstr (pinfo->cinfo, COL_INFO, " %s",
val_to_str (csub, iax_cmd_subclasses, "unknown (0x%02x)"));
break;
case AST_FRAME_VOICE:
/* add the codec */
iax_packet -> codec = codec = uncompress_subclass(csub);
if( packet_type_tree ) {
proto_tree_add_item (packet_type_tree, hf_iax2_voice_csub, tvb, offset+9, 1, FALSE);
proto_tree_add_uint (packet_type_tree, hf_iax2_voice_codec, tvb, offset+9, 1, codec);
}
offset += 10;
if( iax_call ) {
if( reversed ) {
iax_call->dst_codec = codec;
} else {
iax_call->src_codec = codec;
}
}
dissect_payload(tvb, offset, pinfo, main_tree, ts, FALSE,iax_packet);
break;
case AST_FRAME_VIDEO:
/* bit 6 of the csub is used to represent the rtp 'marker' bit */
rtp_marker = csub & 0x40 ? TRUE:FALSE;
iax_packet -> codec = codec = uncompress_subclass((guint8) (csub & ~40));
if( packet_type_tree ) {
proto_tree_add_item (packet_type_tree, hf_iax2_video_csub, tvb, offset+9, 1, FALSE);
proto_tree_add_item (packet_type_tree, hf_iax2_marker, tvb, offset+9, 1, FALSE);
proto_tree_add_uint (packet_type_tree, hf_iax2_video_codec, tvb, offset+9, 1, codec);
}
offset += 10;
if( iax_call ) {
if( reversed ) {
iax_call->dst_vformat = codec;
} else {
iax_call->src_vformat = codec;
}
}
if( rtp_marker && check_col (pinfo->cinfo, COL_INFO))
col_append_fstr (pinfo->cinfo, COL_INFO, ", Mark" );
dissect_payload(tvb, offset, pinfo, main_tree, ts, TRUE, iax_packet);
break;
default:
proto_tree_add_uint (packet_type_tree, hf_iax2_csub, tvb, offset+9,
1, csub);
offset += 10;
if (check_col (pinfo->cinfo, COL_INFO))
col_append_fstr (pinfo->cinfo, COL_INFO, " subclass %d", csub );
break;
}
return offset;
}
static iax_packet_data *iax2_get_packet_data_for_minipacket(packet_info * pinfo,
guint16 scallno,
gboolean video)
{
/* see if we've seen this packet before */
iax_packet_data *p = (iax_packet_data *)p_get_proto_data(pinfo->fd,proto_iax2);
if( !p ) {
/* if not, find or create an iax_call info structure for this IAX session. */
gboolean reversed;
circuit_t *circuit;
iax_call_data *iax_call;
iax_call = iax_lookup_circuit_details(pinfo, scallno, 0, &reversed, &circuit);
p = iax_new_packet_data(iax_call);
p_add_proto_data(pinfo->fd,proto_iax2,p);
/* set the codec for this frame to be whatever the last full frame used */
if( video )
p->codec = reversed ? iax_call -> dst_vformat : iax_call -> src_vformat;
else
p->codec = reversed ? iax_call -> dst_codec : iax_call -> src_codec;
}
return p;
}
static guint32 dissect_minivideopacket (tvbuff_t * tvb, guint32 offset,
guint16 scallno, packet_info * pinfo,
proto_tree * iax2_tree, proto_tree *main_tree)
{
guint32 ts;
iax_packet_data *iax_packet;
gboolean rtp_marker;
ts = tvb_get_ntohs(tvb, offset);
/* bit 15 of the ts is used to represent the rtp 'marker' bit */
rtp_marker = ts & 0x8000 ? TRUE:FALSE;
ts &= ~0x8000;
if( iax2_tree ) {
proto_tree_add_item (iax2_tree, hf_iax2_minividts, tvb, offset, 2, FALSE);
proto_tree_add_item (iax2_tree, hf_iax2_minividmarker, tvb, offset, 2, FALSE);
}
offset += 2;
iax_packet = iax2_get_packet_data_for_minipacket(pinfo, scallno, TRUE);
if (check_col (pinfo->cinfo, COL_INFO))
col_add_fstr (pinfo->cinfo, COL_INFO,
"Mini video packet, source call# %d, timestamp %ums%s",
scallno, ts, rtp_marker?", Mark":"");
dissect_payload(tvb, offset, pinfo, main_tree, ts, TRUE, iax_packet);
return offset;
}
static guint32
dissect_minipacket (tvbuff_t * tvb, guint32 offset, guint16 scallno, packet_info * pinfo, proto_tree * iax2_tree,
proto_tree *main_tree)
{
guint32 ts;
iax_packet_data *iax_packet;
ts = tvb_get_ntohs(tvb, offset);
iax_packet = iax2_get_packet_data_for_minipacket(pinfo, scallno, FALSE);
proto_tree_add_uint (iax2_tree, hf_iax2_minits, tvb, offset, 2,
ts);
offset += 2;
if (check_col (pinfo->cinfo, COL_INFO))
col_add_fstr (pinfo->cinfo, COL_INFO,
"Mini packet, source call# %d, timestamp %ums",
scallno, ts);
/* XXX fix the timestamp logic */
dissect_payload(tvb, offset, pinfo, main_tree, ts, FALSE, iax_packet);
return offset;
}
static void dissect_payload(tvbuff_t *tvb, guint32 offset,
packet_info *pinfo, proto_tree *tree,
guint32 ts, gboolean video,
iax_packet_data *iax_packet)
{
gboolean out_of_order = FALSE;
tvbuff_t *sub_tvb;
guint32 codec = iax_packet -> codec;
iax_call_data *iax_call = iax_packet -> call_data;
/* keep compiler quiet */
ts = ts;
if( offset >= tvb_reported_length (tvb)) {
if (check_col (pinfo->cinfo, COL_INFO))
col_append_fstr (pinfo->cinfo, COL_INFO, ", empty frame" );
return;
}
sub_tvb = tvb_new_subset(tvb, offset, -1, -1 );
/* XXX shouldn't pass through out-of-order packets. */
if (check_col (pinfo->cinfo, COL_INFO)) {
if( !video && iax_call && iax_call -> dataformat != 0 ) {
col_append_fstr (pinfo->cinfo, COL_INFO, ", data, format %s",
val_to_str (iax_call -> dataformat,
iax_dataformats, "unknown (0x%02x)"));
if( out_of_order )
col_append_fstr (pinfo->cinfo, COL_INFO, " (out-of-order packet)");
} else {
col_append_fstr (pinfo->cinfo, COL_INFO, ", %s",
val_to_str (codec, codec_types, "unknown (0x%02x)"));
}
}
/* pass the rest of the block to a subdissector */
if( !video && try_circuit_dissector(pinfo->ctype, pinfo->circuit_id, pinfo->fd->num,
sub_tvb, pinfo, tree))
return;
if( codec != 0 && dissector_try_port(iax2_codec_dissector_table, codec, sub_tvb, pinfo, tree ))
return;
/* we don't know how to dissect our data: dissect it as data */
call_dissector(data_handle,sub_tvb, pinfo, tree);
}
/*
* Init routines
*/
/* called at the start of a capture. We should clear out our static, per-capture
* data.
*/
static void
iax_init_protocol(void)
{
iax_init_hash();
if (iax_packets)
g_mem_chunk_destroy(iax_packets);
iax_packets = g_mem_chunk_create(iax_packet_data,128,G_ALLOC_ONLY);
}
void
proto_register_iax2 (void)
{
/* we use this for displaying which codecs are supported */
static const true_false_string supported_strings = {
"Supported",
"Not supported"
};
/* A header field is something you can search/filter on.
*
* We create a structure to register our fields. It consists of an
* array of hf_register_info structures, each of which are of the format
* {&(field id), {name, abbrev, type, display, strings, bitmask, blurb, HFILL}}.
*/
static hf_register_info hf[] = {
{&hf_iax2_packet_type,
{"Packet type", "iax2.type", FT_UINT8, BASE_DEC, VALS(iax_packet_types), 0,
"Full/minivoice/minivideo/meta packet",
HFILL}},
{&hf_iax2_scallno,
{"Source call", "iax2.src_call", FT_UINT16, BASE_DEC, NULL, 0x7FFF,
"src_call holds the number of this call at the packet source pbx",
HFILL}},
/* FIXME could this be turned into a FRAMENUM field? */
{&hf_iax2_dcallno,
{"Destination call", "iax2.dst_call", FT_UINT16, BASE_DEC, NULL, 0x7FFF,
"dst_call holds the number of this call at the packet destination",
HFILL}},
{&hf_iax2_retransmission,
{"Retransmission", "iax2.retransmission", FT_BOOLEAN, 16,
NULL, 0x8000,
"retransmission is set if this packet is a retransmission of an earlier "
"failed packet", HFILL}},
{&hf_iax2_ts,
{"Timestamp", "iax2.timestamp", FT_UINT32, BASE_DEC, NULL, 0x0,
"timestamp is the time, in ms after the start of this call, at which "
"this packet was transmitted",
HFILL}},
{&hf_iax2_minits,
{"Timestamp", "iax2.timestamp", FT_UINT16, BASE_DEC, NULL, 0x0,
"timestamp is the time, in ms after the start of this call, at which "
"this packet was transmitted",
HFILL}},
{&hf_iax2_minividts,
{"Timestamp", "iax2.timestamp", FT_UINT16, BASE_DEC, NULL, 0x7FFF,
"timestamp is the time, in ms after the start of this call, at which "
"this packet was transmitted",
HFILL}},
{&hf_iax2_minividmarker,
{"Marker", "iax2.video.marker", FT_UINT16, BASE_DEC, NULL, 0x8000,
"RTP end-of-frame marker",
HFILL}},
{&hf_iax2_oseqno,
{"Outbound seq.no.", "iax2.oseqno", FT_UINT16, BASE_DEC, NULL,
0x0,
"oseqno is the sequence no of this packet. The first packet has "
"oseqno==0, and subsequent packets increment the oseqno by 1",
HFILL}},
{&hf_iax2_iseqno,
{"Inbound seq.no.", "iax2.iseqno", FT_UINT16, BASE_DEC, NULL, 0x0,
"iseqno is the sequence no of the last successfully recieved packet",
HFILL}},
{&hf_iax2_type,
{"Type", "iax2.type", FT_UINT8, BASE_DEC, VALS (iax_frame_types),
0x0,
"For full IAX2 frames, type is the type of frame",
HFILL}},
{&hf_iax2_csub,
{"Sub-class", "iax2.subclass", FT_UINT8, BASE_DEC, NULL, 0x0,
"subclass",
HFILL}},
{&hf_iax2_cmd_csub,
{"Control subclass", "iax2.control.subclass", FT_UINT8, BASE_DEC,
VALS (iax_cmd_subclasses), 0x0,
"This gives the command number for a Control packet.", HFILL}},
{&hf_iax2_iax_csub,
{"IAX type", "iax2.iax.subclass", FT_UINT8, BASE_DEC,
VALS (iax_iax_subclasses),
0x0,
"IAX type gives the command number for IAX signalling packets", HFILL}},
{&hf_iax2_voice_csub,
{"Sub-class", "iax2.voice.subclass", FT_UINT8, BASE_DEC, NULL, 0x0,
"subclass",
HFILL}},
{&hf_iax2_voice_codec,
{"CODEC", "iax2.voice.codec", FT_UINT32, BASE_HEX, VALS (codec_types),
0x0,
"CODEC gives the codec used to encode audio data", HFILL}},
{&hf_iax2_video_csub,
{"Subclass (compressed codec no)", "iax2.video.subclass", FT_UINT8, BASE_DEC, NULL, 0xBF,
"Subclass (compressed codec no)",
HFILL}},
{&hf_iax2_marker,
{"Marker", "iax2.video.marker", FT_BOOLEAN, 8, NULL, 0x40,
"RTP end-of-frame marker",
HFILL}},
{&hf_iax2_video_codec,
{"CODEC", "iax2.video.codec", FT_UINT32, BASE_HEX, VALS (codec_types), 0,
"The codec used to encode video data", HFILL}},
/*
* Decoding for the ies
*/
{&hf_IAX_IE_APPARENTADDR_SINFAMILY,
{"Family", "iax2.iax.app_addr.sinfamily", FT_UINT16, BASE_DEC, NULL, 0, "Family", HFILL }},
{&hf_IAX_IE_APPARENTADDR_SINPORT,
{"Port", "iax2.iax.app_addr.sinport", FT_UINT16, BASE_DEC, NULL, 0, "Port", HFILL }},
{&hf_IAX_IE_APPARENTADDR_SINADDR,
{"Address", "iax2.iax.app_addr.sinaddr", FT_IPv4, BASE_HEX, NULL, 0, "Address", HFILL }},
{&hf_IAX_IE_APPARENTADDR_SINZERO,
{"Zero", "iax2.iax.app_addr.sinzero", FT_BYTES, BASE_HEX, NULL, 0, "Zero", HFILL }},
{&hf_IAX_IE_CALLED_NUMBER,
{"Number/extension being called", "iax2.iax.called_number",
FT_STRING,
BASE_NONE, NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_CALLING_NUMBER,
{"Calling number", "iax2.iax.calling_number", FT_STRING,
BASE_NONE, NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_CALLING_ANI,
{"Calling number ANI for billing", "iax2.iax.calling_ani",
FT_STRING,
BASE_NONE, NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_CALLING_NAME,
{"Name of caller", "iax2.iax.calling_name", FT_STRING, BASE_NONE,
NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_CALLED_CONTEXT,
{"Context for number", "iax2.iax.called_context", FT_STRING,
BASE_NONE,
NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_USERNAME,
{"Username (peer or user) for authentication",
"iax2.iax.username",
FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_PASSWORD,
{"Password for authentication", "iax2.iax.password", FT_STRING,
BASE_NONE, NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_CAPABILITY,
{"Actual codec capability", "iax2.iax.capability", FT_UINT32,
BASE_HEX,
NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_FORMAT,
{"Desired codec format", "iax2.iax.format", FT_UINT32, BASE_HEX,
VALS (codec_types), 0x0, "", HFILL}},
{&hf_IAX_IE_LANGUAGE,
{"Desired language", "iax2.iax.language", FT_STRING, BASE_NONE,
NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_VERSION,
{"Protocol version", "iax2.iax.version", FT_UINT16, BASE_HEX, NULL,
0x0,
"", HFILL}},
{&hf_IAX_IE_ADSICPE,
{"CPE ADSI capability", "iax2.iax.cpe_adsi", FT_UINT16, BASE_HEX,
NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_DNID,
{"Originally dialed DNID", "iax2.iax.dnid", FT_STRING, BASE_NONE,
NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_AUTHMETHODS,
{"Authentication method(s)", "iax2.iax.auth.methods", FT_UINT16,
BASE_HEX,
NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_CHALLENGE,
{"Challenge data for MD5/RSA", "iax2.iax.auth.challenge",
FT_STRING,
BASE_NONE, NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_MD5_RESULT,
{"MD5 challenge result", "iax2.iax.auth.md5", FT_STRING,
BASE_NONE, NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_RSA_RESULT,
{"RSA challenge result", "iax2.iax.auth.rsa", FT_STRING,
BASE_NONE, NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_REFRESH,
{"When to refresh registration", "iax2.iax.refresh", FT_INT16,
BASE_DEC,
NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_DPSTATUS,
{"Dialplan status", "iax2.iax.dialplan_status", FT_UINT16,
BASE_HEX, NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_CALLNO,
{"Call number of peer", "iax2.iax.call_no", FT_INT16, BASE_DEC,
NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_CAUSE,
{"Cause", "iax2.iax.cause", FT_STRING, BASE_NONE, NULL, 0x0, "",
HFILL}},
{&hf_IAX_IE_IAX_UNKNOWN,
{"Unknown IAX command", "iax2.iax.iax_unknown", FT_BYTES,
BASE_HEX, NULL,
0x0, "", HFILL}},
{&hf_IAX_IE_MSGCOUNT,
{"How many messages waiting", "iax2.iax.msg_count", FT_INT16,
BASE_DEC,
NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_AUTOANSWER,
{"Request auto-answering", "iax2.iax.autoanswer", FT_NONE,
BASE_NONE,
NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_MUSICONHOLD,
{"Request musiconhold with QUELCH", "iax2.iax.moh", FT_NONE,
BASE_NONE,
NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_TRANSFERID,
{"Transfer Request Identifier", "iax2.iax.transferid", FT_UINT32,
BASE_HEX, NULL, 0x0, "", HFILL}},
{&hf_IAX_IE_RDNIS,
{"Referring DNIS", "iax2.iax.rdnis", FT_STRING, BASE_NONE, NULL,
0x0, "",
HFILL}},
{&hf_IAX_IE_DATAFORMAT,
{"Data call format", "iax2.iax.dataformat", FT_UINT32, BASE_HEX,
VALS(iax_dataformats), 0x0, "", HFILL}},
{&hf_IAX_IE_UNKNOWN_BYTE,
{"data", "iax2.iax.unknowndata", FT_UINT8, BASE_HEX, NULL,
0x0, "Raw data for unknown IEs",
HFILL}},
{&hf_IAX_IE_UNKNOWN_I16,
{"data", "iax2.iax.unknowndata", FT_UINT16, BASE_HEX, NULL,
0x0, "Raw data for unknown IEs",
HFILL}},
{&hf_IAX_IE_UNKNOWN_I32,
{"data", "iax2.iax.unknowndata", FT_UINT32, BASE_HEX, NULL,
0x0, "Raw data for unknown IEs",
HFILL}},
{&hf_IAX_IE_UNKNOWN_BYTES,
{"data", "iax2.iax.unknowndata", FT_BYTES, BASE_NONE, NULL,
0x0, "Raw data for unknown IEs",
HFILL}},
/* capablilites */
{&hf_iax2_cap_g723_1,
{"G.723.1 compression", "iax2.cap.g723_1", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_G723_1,
"G.723.1 compression", HFILL }},
{&hf_iax2_cap_gsm,
{"GSM compression", "iax2.cap.gsm", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_GSM,
"GSM compression", HFILL }},
{&hf_iax2_cap_ulaw,
{"Raw mu-law data (G.711)", "iax2.cap.ulaw",FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_ULAW,
"Raw mu-law data (G.711)", HFILL }},
{&hf_iax2_cap_alaw,
{"Raw A-law data (G.711)", "iax2.cap.alaw",FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_ALAW,
"Raw A-law data (G.711)", HFILL }},
{&hf_iax2_cap_g726,
{"G.726 compression", "iax2.cap.g726",FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_G726,
"G.726 compression", HFILL }},
{&hf_iax2_cap_adpcm,
{"ADPCM", "iax2.cap.adpcm", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_ADPCM,
"ADPCM", HFILL }},
{&hf_iax2_cap_slinear,
{"Raw 16-bit Signed Linear (8000 Hz) PCM", "iax2.cap.slinear",
FT_BOOLEAN, 32, TFS(&supported_strings), AST_FORMAT_SLINEAR,
"Raw 16-bit Signed Linear (8000 Hz) PCM", HFILL }},
{&hf_iax2_cap_lpc10,
{"LPC10, 180 samples/frame", "iax2.cap.lpc10", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_LPC10,
"LPC10, 180 samples/frame", HFILL }},
{&hf_iax2_cap_g729a,
{"G.729a Audio", "iax2.cap.g729a", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_G729A,
"G.729a Audio", HFILL }},
{&hf_iax2_cap_speex,
{"SPEEX Audio", "iax2.cap.speex", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_SPEEX,
"SPEEX Audio", HFILL }},
{&hf_iax2_cap_ilbc,
{"iLBC Free compressed Audio", "iax2.cap.ilbc", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_ILBC,
"iLBC Free compressed Audio", HFILL }},
{&hf_iax2_cap_jpeg,
{"JPEG images", "iax2.cap.jpeg", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_JPEG,
"JPEG images", HFILL }},
{&hf_iax2_cap_png,
{"PNG images", "iax2.cap.png", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_PNG,
"PNG images", HFILL }},
{&hf_iax2_cap_h261,
{"H.261 video", "iax2.cap.h261", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_H261,
"H.261 video", HFILL }},
{&hf_iax2_cap_h263,
{"H.263 video", "iax2.cap.h263", FT_BOOLEAN, 32,
TFS(&supported_strings), AST_FORMAT_H263,
"H.263 video", HFILL }}
};
static gint *ett[] = {
&ett_iax2,
&ett_iax2_full_mini_subtree,
&ett_iax2_type,
&ett_iax2_ie,
&ett_iax2_codecs,
&ett_iax2_ies_apparent_addr
};
proto_iax2 =
proto_register_protocol ("Inter-Asterisk eXchange v2", "IAX2", "iax2");
proto_register_field_array (proto_iax2, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
register_dissector("iax2", dissect_iax2, proto_iax2);
iax2_codec_dissector_table = register_dissector_table(
"iax2.codec","IAX codec number", FT_UINT32, BASE_HEX);
iax2_dataformat_dissector_table = register_dissector_table(
"iax2.dataformat","IAX dataformat number", FT_UINT32, BASE_HEX);
/* register our init routine to be called at the start of a capture,
to clear out our hash tables etc */
register_init_routine(&iax_init_protocol);
}
void
proto_reg_handoff_iax2 (void)
{
dissector_add("udp.port", IAX2_PORT, find_dissector("iax2"));
dissector_add("iax2.dataformat", AST_DATAFORMAT_V110, find_dissector("v110"));
data_handle = find_dissector("data");
}
/*
* This sets up the indentation style for this file in emacs.
*
* Local Variables:
* c-basic-offset: 2
* End:
*/
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