forked from osmocom/wireshark
227 lines
7.4 KiB
C
227 lines
7.4 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, https://www.ietf.org/rfc/rfc3094
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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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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.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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void proto_reg_handoff_tali(void);
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void proto_register_tali(void);
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static int proto_tali = -1;
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static int hf_tali_length_indicator = -1;
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static int hf_tali_opcode_indicator = -1;
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static int hf_tali_sync_indicator = -1;
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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 dissector_table_t tali_dissector_table;
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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(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
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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 int
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dissect_tali_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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char *opcode; /* 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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opcode = (char *) tvb_get_string_enc(pinfo->pool, tvb, TALI_SYNC_LENGTH, TALI_OPCODE_LENGTH, ENC_ASCII|ENC_NA);
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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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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TALI");
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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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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, ENC_NA);
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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_remaining(tvb, TALI_HEADER_LENGTH);
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if (payload_tvb != NULL && !dissector_try_string(tali_dissector_table, opcode, payload_tvb, pinfo, tree, NULL)) {
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call_data_dissector(payload_tvb, pinfo, tree);
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}
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}
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return tvb_captured_length(tvb);
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}
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static int
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dissect_tali(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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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, data);
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return tvb_captured_length(tvb);
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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, void *data)
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{
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char opcode[TALI_OPCODE_LENGTH]; /* TALI opcode */
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/*
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* If we don't have at least TALI_HEADER_LENGTH bytes worth of captured
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* data (i.e., available to look at), we can't determine whether this
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* looks like a TALI packet or not. We must use tvb_captured_length()
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* because the data must be present in the capture, not sliced off due
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* to the snapshot length specified for the capture.
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*/
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if (tvb_captured_length(tvb) < TALI_HEADER_LENGTH) /* Mandatory header */
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return FALSE;
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if (tvb_strneql(tvb, 0, TALI_SYNC, TALI_SYNC_LENGTH) != 0)
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return FALSE;
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tvb_memcpy(tvb, (guint8*)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, data);
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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",
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FT_STRING, BASE_NONE, NULL, 0x00,
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"TALI SYNC", HFILL }
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},
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{ &hf_tali_opcode_indicator,
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{ "Opcode", "tali.opcode",
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FT_STRING, BASE_NONE, NULL, 0x00,
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"TALI Operation Code", HFILL }
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},
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{ &hf_tali_length_indicator,
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{ "Length", "tali.msu_length",
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FT_UINT16, BASE_DEC, NULL, 0x00,
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"TALI MSU Length", HFILL }
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},
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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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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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register_dissector("tali", dissect_tali, proto_tali);
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tali_dissector_table = register_dissector_table("tali.opcode", "Tali OPCODE", proto_tali, 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, "Tali over TCP", "tali_tcp", proto_tali, HEURISTIC_ENABLE);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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