forked from osmocom/wireshark
f331077a60
while this should improve performance by unmeasurably little it does have the sideeffect that once we finish the rewrite tcp analysis might actually work and work well even for tcp over tcp tunnelling. this also means that if you include packet-tcp.h you also need to include emem.h . svn path=/trunk/; revision=17681
226 lines
7.7 KiB
C
226 lines
7.7 KiB
C
/* packet-tali.c
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*
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* Routines for Transport Adapter Layer Interface (TALI) version 1.0 dissection (RFC 3094)
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*
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* Copyright : 2004 Viorel Suman, <vsuman[AT]avmob.ro>
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* In association with Avalanche Mobile BV, http://www.avmob.com
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*
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* Dissector of a TALI (Transport Adapter Layer Interface) version 1.0, as defined by the
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* Tekelec (www.tekelec.com) in RFC 3094, http://www.ietf.org/rfc/rfc3094.txt
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*
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* $Id$
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*
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* Refer to the AUTHORS file or the AUTHORS section in the man page
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* for contacting the author(s) of this file.
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/emem.h>
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#include "packet-tcp.h"
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#define TALI_SYNC_LENGTH 4
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#define TALI_OPCODE_LENGTH 4
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#define TALI_MSU_LENGTH 2
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#define TALI_HEADER_LENGTH TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH + TALI_MSU_LENGTH
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#define TALI_SYNC "TALI"
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#define TALI_TEST "test"
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#define TALI_ALLO "allo"
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#define TALI_PROH "proh"
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#define TALI_PROA "proa"
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#define TALI_MONI "moni"
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#define TALI_MONA "mona"
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#define TALI_SCCP "sccp"
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#define TALI_ISOT "isot"
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#define TALI_MTP3 "mtp3"
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#define TALI_SAAL "saal"
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/* Initialize the subtree pointers */
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static gint ett_tali = -1;
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static gint ett_tali_sync = -1;
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static gint ett_tali_opcode = -1;
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static gint ett_tali_msu_length = -1;
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static int proto_tali = -1;
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static dissector_handle_t tali_handle;
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static dissector_table_t tali_dissector_table;
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/* Initialize the protocol and registered fields */
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static int hf_tali_sync_indicator = -1;
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static int hf_tali_opcode_indicator = -1;
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static int hf_tali_length_indicator = -1;
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static dissector_handle_t data_handle;
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/* Desegment TALI messages */
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static gboolean tali_desegment = TRUE;
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/* Code to actually dissect the packets */
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static guint
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get_tali_pdu_len(tvbuff_t *tvb, int offset)
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{
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guint16 length;
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length = tvb_get_letohs(tvb, offset + TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH);
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return length+TALI_HEADER_LENGTH;
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}
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static void
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dissect_tali_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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char opcode[TALI_OPCODE_LENGTH+1]; /* TALI opcode */
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guint16 length; /* TALI length */
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tvbuff_t *payload_tvb = NULL;
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *tali_item = NULL;
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proto_tree *tali_tree = NULL;
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tvb_memcpy(tvb, opcode, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH);
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opcode[TALI_OPCODE_LENGTH] = '\0';
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length = tvb_get_letohs(tvb, TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH);
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/* Make entries in Protocol column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TALI");
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_set_str(pinfo->cinfo, COL_INFO, "");
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col_append_fstr(pinfo->cinfo, COL_INFO, "[%s] packet, [%u] bytes in payload", opcode, length);
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}
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if (tree) {
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/* create display subtree for the protocol */
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tali_item = proto_tree_add_item(tree, proto_tali, tvb, 0, TALI_HEADER_LENGTH, TRUE);
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tali_tree = proto_item_add_subtree(tali_item, ett_tali);
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proto_tree_add_string(tali_tree, hf_tali_sync_indicator, tvb, 0, TALI_SYNC_LENGTH, TALI_SYNC);
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proto_tree_add_string(tali_tree, hf_tali_opcode_indicator, tvb, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH, opcode);
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proto_tree_add_uint(tali_tree, hf_tali_length_indicator, tvb, TALI_SYNC_LENGTH + TALI_OPCODE_LENGTH, TALI_MSU_LENGTH, length);
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}
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if (length > 0) {
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payload_tvb = tvb_new_subset(tvb, TALI_HEADER_LENGTH, -1, -1);
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if (payload_tvb != NULL && !dissector_try_string(tali_dissector_table, opcode, payload_tvb, pinfo, tree)) {
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call_dissector(data_handle, payload_tvb, pinfo, tree);
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}
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}
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}
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static void
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dissect_tali(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, tali_desegment, TALI_HEADER_LENGTH,
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get_tali_pdu_len, dissect_tali_pdu);
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}
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/*
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* A 'heuristic dissector' that attemtps to establish whether we have
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* a TALI MSU here.
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* Only works when:
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* the fixed header is there
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* it is a 'well-known' operation
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*/
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static gboolean
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dissect_tali_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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char sync[TALI_SYNC_LENGTH]; /* TALI sync */
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char opcode[TALI_OPCODE_LENGTH]; /* TALI opcode */
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if (tvb_reported_length(tvb) < TALI_HEADER_LENGTH) /* Mandatory header */
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return FALSE;
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tvb_memcpy(tvb, sync, 0, TALI_SYNC_LENGTH);
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if (strncmp(sync, TALI_SYNC, TALI_SYNC_LENGTH) != 0)
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return FALSE;
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tvb_memcpy(tvb, opcode, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH);
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if (strncmp(opcode, TALI_TEST, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_ALLO, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_PROH, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_PROA, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_MONI, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_MONA, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_SCCP, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_ISOT, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_MTP3, TALI_OPCODE_LENGTH) != 0 &&
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strncmp(opcode, TALI_SAAL, TALI_OPCODE_LENGTH) != 0)
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return FALSE;
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dissect_tali(tvb, pinfo, tree);
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return TRUE;
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}
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void
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proto_register_tali(void)
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{
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static hf_register_info hf[] = {
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{ &hf_tali_sync_indicator,
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{ "Sync", "tali.sync", FT_STRING, BASE_NONE, NULL, 0x00, "TALI SYNC", HFILL }},
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{ &hf_tali_opcode_indicator,
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{ "Opcode", "tali.opcode", FT_STRING, BASE_NONE, NULL, 0x00, "TALI Operation Code", HFILL }},
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{ &hf_tali_length_indicator,
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{ "Length", "tali.msu_length", FT_UINT16, BASE_DEC, NULL, 0x00, "TALI MSU Length", HFILL }}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_tali,
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&ett_tali_sync,
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&ett_tali_opcode,
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&ett_tali_msu_length
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};
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module_t *tali_module;
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/* Register the protocol name and description */
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proto_tali = proto_register_protocol("Transport Adapter Layer Interface v1.0, RFC 3094", "TALI", "tali");
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register_dissector("tali", dissect_tali, proto_tali);
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tali_handle = create_dissector_handle(dissect_tali, proto_tali);
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_tali, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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tali_dissector_table = register_dissector_table("tali.opcode", "Tali OPCODE", FT_STRING, BASE_NONE);
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tali_module = prefs_register_protocol(proto_tali, NULL);
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prefs_register_bool_preference(tali_module, "reassemble",
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"Reassemble TALI messages spanning multiple TCP segments",
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"Whether the TALI dissector should reassemble messages spanning multiple TCP segments."
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" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&tali_desegment);
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}
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void
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proto_reg_handoff_tali(void)
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{
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heur_dissector_add("tcp", dissect_tali_heur, proto_tali);
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data_handle = find_dissector("data");
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}
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