/* packet-tali.c * * Routines for Transport Adapter Layer Interface (TALI) version 1.0 dissection (RFC 3094) * * Copyright : 2004 Viorel Suman, * 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 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include #include #include #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, void *data _U_) { 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"); }