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/* packet-tali.c
*
* Routines for Transport Adapter Layer Interface (TALI) version 1.0 dissection (RFC 3094)
*
* Copyright : 2004 Viorel Suman, <vsuman[AT]avmob.ro>
* In association with Avalanche Mobile BV, http://www.avmob.com
*
* Dissector of a TALI (Transport Adapter Layer Interface) version 1.0, as defined by the
* Tekelec (www.tekelec.com) in RFC 3094, http://www.ietf.org/rfc/rfc3094.txt
*
* $Id$
*
* Refer to the AUTHORS file or the AUTHORS section in the man page
* for contacting the author(s) of this file.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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 <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include "packet-tcp.h"
#define TALI_SYNC_LENGTH 4
#define TALI_OPCODE_LENGTH 4
#define TALI_MSU_LENGTH 2
#define TALI_HEADER_LENGTH TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH + TALI_MSU_LENGTH
#define TALI_SYNC "TALI"
#define TALI_TEST "test"
#define TALI_ALLO "allo"
#define TALI_PROH "proh"
#define TALI_PROA "proa"
#define TALI_MONI "moni"
#define TALI_MONA "mona"
#define TALI_SCCP "sccp"
#define TALI_ISOT "isot"
#define TALI_MTP3 "mtp3"
#define TALI_SAAL "saal"
/* Initialize the subtree pointers */
static gint ett_tali = -1;
static gint ett_tali_sync = -1;
static gint ett_tali_opcode = -1;
static gint ett_tali_msu_length = -1;
static int proto_tali = -1;
static dissector_handle_t tali_handle;
static dissector_table_t tali_dissector_table;
/* Initialize the protocol and registered fields */
static int hf_tali_sync_indicator = -1;
static int hf_tali_opcode_indicator = -1;
static int hf_tali_length_indicator = -1;
static dissector_handle_t data_handle;
/* Desegment TALI messages */
static gboolean tali_desegment = TRUE;
/* Code to actually dissect the packets */
static guint
get_tali_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
{
guint16 length;
length = tvb_get_letohs(tvb, offset + TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH);
return length+TALI_HEADER_LENGTH;
}
static void
dissect_tali_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
char opcode[TALI_OPCODE_LENGTH+1]; /* TALI opcode */
guint16 length; /* TALI length */
tvbuff_t *payload_tvb = NULL;
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *tali_item = NULL;
proto_tree *tali_tree = NULL;
tvb_memcpy(tvb, (guint8*)opcode, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH);
opcode[TALI_OPCODE_LENGTH] = '\0';
length = tvb_get_letohs(tvb, TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH);
/* Make entries in Protocol column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TALI");
if (check_col(pinfo->cinfo, COL_INFO)) {
col_set_str(pinfo->cinfo, COL_INFO, "");
col_append_fstr(pinfo->cinfo, COL_INFO, "[%s] packet, [%u] bytes in payload", opcode, length);
}
if (tree) {
/* create display subtree for the protocol */
tali_item = proto_tree_add_item(tree, proto_tali, tvb, 0, TALI_HEADER_LENGTH, ENC_NA);
tali_tree = proto_item_add_subtree(tali_item, ett_tali);
proto_tree_add_string(tali_tree, hf_tali_sync_indicator, tvb, 0, TALI_SYNC_LENGTH, TALI_SYNC);
proto_tree_add_string(tali_tree, hf_tali_opcode_indicator, tvb, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH, opcode);
proto_tree_add_uint(tali_tree, hf_tali_length_indicator, tvb, TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH, TALI_MSU_LENGTH, length);
}
if (length > 0) {
payload_tvb = tvb_new_subset_remaining(tvb, TALI_HEADER_LENGTH);
if (payload_tvb != NULL && !dissector_try_string(tali_dissector_table, opcode, payload_tvb, pinfo, tree)) {
call_dissector(data_handle, payload_tvb, pinfo, tree);
}
}
}
static void
dissect_tali(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
tcp_dissect_pdus(tvb, pinfo, tree, tali_desegment, TALI_HEADER_LENGTH,
get_tali_pdu_len, dissect_tali_pdu);
}
/*
* A 'heuristic dissector' that attemtps to establish whether we have
* a TALI MSU here.
* Only works when:
* the fixed header is there
* it is a 'well-known' operation
*/
static gboolean
dissect_tali_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
char opcode[TALI_OPCODE_LENGTH]; /* TALI opcode */
if (tvb_reported_length(tvb) < TALI_HEADER_LENGTH) /* Mandatory header */
return FALSE;
if (tvb_strneql(tvb, 0, TALI_SYNC, TALI_SYNC_LENGTH) != 0)
return FALSE;
tvb_memcpy(tvb, (guint8*)opcode, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH);
if (strncmp(opcode, TALI_TEST, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_ALLO, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_PROH, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_PROA, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_MONI, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_MONA, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_SCCP, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_ISOT, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_MTP3, TALI_OPCODE_LENGTH) != 0 &&
strncmp(opcode, TALI_SAAL, TALI_OPCODE_LENGTH) != 0)
return FALSE;
dissect_tali(tvb, pinfo, tree);
return TRUE;
}
void
proto_register_tali(void)
{
static hf_register_info hf[] = {
{ &hf_tali_sync_indicator,
{ "Sync", "tali.sync", FT_STRING, BASE_NONE, NULL, 0x00, "TALI SYNC", HFILL }},
{ &hf_tali_opcode_indicator,
{ "Opcode", "tali.opcode", FT_STRING, BASE_NONE, NULL, 0x00, "TALI Operation Code", HFILL }},
{ &hf_tali_length_indicator,
{ "Length", "tali.msu_length", FT_UINT16, BASE_DEC, NULL, 0x00, "TALI MSU Length", HFILL }}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_tali,
&ett_tali_sync,
&ett_tali_opcode,
&ett_tali_msu_length
};
module_t *tali_module;
/* Register the protocol name and description */
proto_tali = proto_register_protocol("Transport Adapter Layer Interface v1.0, RFC 3094", "TALI", "tali");
register_dissector("tali", dissect_tali, proto_tali);
tali_handle = create_dissector_handle(dissect_tali, proto_tali);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_tali, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
tali_dissector_table = register_dissector_table("tali.opcode", "Tali OPCODE", FT_STRING, BASE_NONE);
tali_module = prefs_register_protocol(proto_tali, NULL);
prefs_register_bool_preference(tali_module, "reassemble",
"Reassemble TALI messages spanning multiple TCP segments",
"Whether the TALI 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.",
&tali_desegment);
}
void
proto_reg_handoff_tali(void)
{
heur_dissector_add("tcp", dissect_tali_heur, proto_tali);
data_handle = find_dissector("data");
}
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