/* packet-sual.c * Routines for SUA light, a Siemens propriatary protocol * * Copyright 2001, Martin Held * Michael Tüxen * * $Id: packet-sual.c,v 1.6 2001/06/18 02:17:53 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from README.developer * * 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 #include #ifdef HAVE_SYS_TYPES_H # include #endif #ifdef HAVE_NETINET_IN_H # include #endif #include #include #ifdef NEED_SNPRINTF_H # include "snprintf.h" #endif #include "packet.h" #define SUAL_PAYLOAD_PROTO_ID 4 #define VERSION_LENGTH 1 #define SPARE_1_LENGTH 1 #define MESSAGE_TYPE_LENGTH 2 #define SUBSYSTEM_NUMBER_LENGTH 2 #define SPARE_2_LENGTH 2 #define MESSAGE_LENGTH_LENGTH 4 #define COMMON_HEADER_LENGTH (VERSION_LENGTH + SPARE_1_LENGTH + MESSAGE_TYPE_LENGTH + \ SUBSYSTEM_NUMBER_LENGTH + SPARE_2_LENGTH + MESSAGE_LENGTH_LENGTH) #define VERSION_OFFSET 0 #define SPARE_1_OFFSET (VERSION_OFFSET + VERSION_LENGTH) #define MESSAGE_TYPE_OFFSET (SPARE_1_OFFSET + SPARE_1_LENGTH) #define SUBSYSTEM_NUMBER_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH) #define SPARE_2_OFFSET (SUBSYSTEM_NUMBER_OFFSET + SUBSYSTEM_NUMBER_LENGTH) #define MESSAGE_LENGTH_OFFSET (SPARE_2_OFFSET + SPARE_2_LENGTH) /* SUAL message type coding */ #define SUAL_MSG_CLDT 0x0501 #define SUAL_MSG_CORE 0x0701 #define SUAL_MSG_COAK_CC 0x0702 #define SUAL_MSG_COAK_CREF 0x0712 #define SUAL_MSG_RELRE 0x0703 #define SUAL_MSG_RELCO 0x0704 #define SUAL_MSG_CODT 0x0707 #define SUAL_MSG_ERR 0x0000 static const value_string sual_message_type_values[] = { { SUAL_MSG_CLDT, "Connectionless Data Transfer (CLDT)"}, { SUAL_MSG_CORE, "Connection Request (CORE)"}, { SUAL_MSG_COAK_CC, "Connection Acknowledge (COAK_CC)"}, { SUAL_MSG_COAK_CREF, "Connection Acknowledge (COAK_CREF)"}, { SUAL_MSG_RELRE, "Release Request (RELRE)"}, { SUAL_MSG_RELCO, "Release Complete (RELCO)"}, { SUAL_MSG_CODT, "Connection Oriented Data Transfer (CODT)"}, { SUAL_MSG_ERR, "Error (ERR)"}, { 0, NULL}}; static const value_string sual_message_type_acro_values[] = { { SUAL_MSG_CLDT, "CLDT"}, { SUAL_MSG_CORE, "CORE"}, { SUAL_MSG_COAK_CC, "COAK_CC"}, { SUAL_MSG_COAK_CREF, "COAK_CREF"}, { SUAL_MSG_RELRE, "RELRE"}, { SUAL_MSG_RELCO, "RELCO"}, { SUAL_MSG_CODT, "CODT"}, { SUAL_MSG_ERR, "ERR"}, { 0, NULL}}; /* SUAL Error Codes */ #define SUAL_ERR_INVVERS 0x0001 #define SUAL_ERR_INVSTRID 0x0005 #define SUAL_ERR_INVMSGTYP 0x0006 static const value_string sual_error_code_values[] = { { SUAL_ERR_INVVERS, "Invalid Protocol Version"}, { SUAL_ERR_INVSTRID, "Invalid Stream Identifier"}, { SUAL_ERR_INVMSGTYP, "Invalid Message Type"}, { 0, NULL}}; /* Initialize the protocol and registered fields */ static int proto_sual = -1; static int hf_sual_version = -1; static int hf_sual_spare_1 = -1; static int hf_sual_message_type = -1; static int hf_sual_subsystem_number = -1; static int hf_sual_spare_2 = -1; static int hf_sual_message_length = -1; static int hf_sual_error_code = -1; /* Initialize the subtree pointers */ static gint ett_sual = -1; static dissector_table_t sual_dissector_table; static void dissect_sual_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo, proto_tree *sual_tree, guint16 *subsystem_number) { guint8 version, spare_1; guint16 message_type, spare_2; guint32 message_length; /* Extract the common header */ version = tvb_get_guint8(common_header_tvb, VERSION_OFFSET); spare_1 = tvb_get_guint8(common_header_tvb, SPARE_1_OFFSET); message_type = tvb_get_ntohs(common_header_tvb, MESSAGE_TYPE_OFFSET); *subsystem_number = tvb_get_ntohs(common_header_tvb, SUBSYSTEM_NUMBER_OFFSET); spare_2 = tvb_get_ntohs(common_header_tvb, SPARE_2_OFFSET); message_length = tvb_get_ntohl (common_header_tvb, MESSAGE_LENGTH_OFFSET); if (check_col(pinfo->fd, COL_INFO)) { col_append_str(pinfo->fd, COL_INFO, val_to_str(message_type, sual_message_type_acro_values, "Unknown")); col_append_str(pinfo->fd, COL_INFO, " "); }; if (sual_tree) { /* add the components of the common header to the protocol tree */ proto_tree_add_uint(sual_tree, hf_sual_version, common_header_tvb, VERSION_OFFSET, VERSION_LENGTH, version); proto_tree_add_uint(sual_tree, hf_sual_spare_1, common_header_tvb, SPARE_1_OFFSET, SPARE_1_LENGTH, spare_1); proto_tree_add_uint_format(sual_tree, hf_sual_message_type, common_header_tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH, message_type, "Message type: %u (%s)", message_type, val_to_str(message_type, sual_message_type_values, "Unknown")); proto_tree_add_uint(sual_tree, hf_sual_subsystem_number, common_header_tvb, SUBSYSTEM_NUMBER_OFFSET, SUBSYSTEM_NUMBER_LENGTH, *subsystem_number); proto_tree_add_uint(sual_tree, hf_sual_spare_2, common_header_tvb, SPARE_2_OFFSET, SPARE_2_LENGTH, spare_2); proto_tree_add_uint(sual_tree, hf_sual_message_length, common_header_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, message_length); }; } static void dissect_payload(tvbuff_t *payload_tvb, packet_info *pinfo, guint16 subsystem_number, proto_tree *sual_tree, proto_tree *tree) { guint payload_length = tvb_length(payload_tvb); /* do lookup with the subdissector table */ if ( ! dissector_try_port (sual_dissector_table, subsystem_number, payload_tvb, pinfo, tree)) { if (sual_tree) { proto_tree_add_text(sual_tree, payload_tvb, 0, payload_length, "Payload: %u byte%s", payload_length, plurality(payload_length, "", "s")); } } } static void dissect_error_payload(tvbuff_t *payload_tvb, proto_tree *sual_tree) { if (sual_tree) { proto_tree_add_item(sual_tree, hf_sual_error_code, payload_tvb, 0, 2, FALSE); } } static void dissect_sual_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *sual_tree, proto_tree *tree) { gint offset, payload_length; guint16 subsystem_number; guint16 message_type; tvbuff_t *common_header_tvb; tvbuff_t *payload_tvb; offset = 0; /* extract and process the common header */ common_header_tvb = tvb_new_subset(message_tvb, offset, COMMON_HEADER_LENGTH, COMMON_HEADER_LENGTH); message_type = tvb_get_ntohs(common_header_tvb, MESSAGE_TYPE_OFFSET); dissect_sual_common_header(common_header_tvb, pinfo, sual_tree, &subsystem_number); offset += COMMON_HEADER_LENGTH; payload_length = tvb_length(message_tvb) - COMMON_HEADER_LENGTH; if (payload_length != 0) { payload_tvb = tvb_new_subset(message_tvb, offset, payload_length, payload_length); if (message_type != SUAL_MSG_ERR) { dissect_payload(payload_tvb, pinfo, subsystem_number, sual_tree, tree); } else { dissect_error_payload(payload_tvb, sual_tree); } } } static void dissect_sual(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree) { proto_item *sual_item; proto_tree *sual_tree; /* make entry in the Protocol column on summary display */ if (check_col(pinfo->fd, COL_PROTOCOL)) col_set_str(pinfo->fd, COL_PROTOCOL, "SUAL"); /* In the interest of speed, if "tree" is NULL, don't do any work not necessary to generate protocol tree items. */ if (tree) { /* create the sual protocol tree */ sual_item = proto_tree_add_item(tree, proto_sual, message_tvb, 0, tvb_length(message_tvb), FALSE); sual_tree = proto_item_add_subtree(sual_item, ett_sual); } else { sual_tree = NULL; }; /* dissect the message */ dissect_sual_message(message_tvb, pinfo, sual_tree, tree); } /* Register the protocol with Ethereal */ void proto_register_sual(void) { /* Setup list of header fields */ static hf_register_info hf[] = { { &hf_sual_version, { "Version", "sual.version", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sual_spare_1, { "Spare", "sual.spare_1", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL } }, { &hf_sual_message_type, { "Message Type", "sual.message_type", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sual_subsystem_number, { "Subsystem number", "sual.subsystem_number", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sual_spare_2, { "Spare", "sual.spare_2", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sual_message_length, { "Message length", "sual.message_length", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_sual_error_code, { "Error Code", "sual.error_code", FT_UINT16, BASE_HEX, VALS(&sual_error_code_values), 0x0, "", HFILL } } }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_sual, }; /* Register the protocol name and description */ proto_sual = proto_register_protocol("SCCP user adaptation layer light", "SUAL", "sual"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_sual, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); /* subdissector code */ sual_dissector_table = register_dissector_table("sual.subsystem_number"); }; void proto_reg_handoff_sual(void) { dissector_add("sctp.ppi", SUAL_PAYLOAD_PROTO_ID, dissect_sual, proto_sual); }