/* packet-gsm_ipa.c * Routines for packet dissection of ip.access GSM over IP * Copyright 2009 by Harald Welte * Copyright 2009 by Holger Hans Peter Freyther * * $Id$ * * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include /* Initialize the protocol and registered fields */ static int proto_ipa = -1; static int proto_ipaccess = -1; static int hf_ipa_data_len = -1; static int hf_ipa_protocol = -1; static int hf_ipaccess_msgtype = -1; static int hf_ipaccess_attr_tag = -1; static int hf_ipaccess_attr_string = -1; /* Initialize the subtree pointers */ static gint ett_ipa = -1; static gint ett_ipaccess = -1; enum { SUB_OML, SUB_RSL, SUB_SCCP, /* SUB_IPACCESS, */ SUB_MAX }; static dissector_handle_t sub_handles[SUB_MAX]; #define TCP_PORT_ABISIP_PRIM 3002 #define TCP_PORT_ABISIP_SEC 3003 #define TCP_PORT_ABISIP_INST 3006 #define TCP_PORT_AIP_PRIM 5000 #define ABISIP_RSL 0x00 #define AIP_SCCP 0xfd #define ABISIP_IPACCESS 0xfe #define ABISIP_OML 0xff static const value_string ipa_protocol_vals[] = { { 0x00, "RSL" }, { 0xfd, "SCCP" }, { 0xfe, "IPA" }, { 0xff, "OML" }, { 0, NULL } }; static const value_string ipaccess_msgtype_vals[] = { { 0x00, "PING?" }, { 0x01, "PONG!" }, { 0x04, "IDENTITY REQUEST" }, { 0x05, "IDENTITY RESPONSE" }, { 0x06, "IDENTITY ACK" }, { 0x07, "IDENTITY NACK" }, { 0x08, "PROXY REQUEST" }, { 0x09, "PROXY ACK" }, { 0x0a, "PROXY NACK" }, { 0, NULL } }; static const value_string ipaccess_idtag_vals[] = { { 0x00, "Serial Number" }, { 0x01, "Unit Name" }, { 0x02, "Location" }, { 0x03, "Unit Type" }, { 0x04, "Equipment Version" }, { 0x05, "Software Version" }, { 0x06, "IP Address" }, { 0x07, "MAC Address" }, { 0x08, "Unit ID" }, { 0, NULL } }; static gint dissect_ipa_attr(tvbuff_t *tvb, int base_offs, proto_tree *tree) { guint8 len, attr_type; int offset = base_offs; while (tvb_reported_length_remaining(tvb, offset) > 0) { attr_type = tvb_get_guint8(tvb, offset); switch (attr_type) { case 0x00: /* a string prefixed by its length */ len = tvb_get_guint8(tvb, offset+1); proto_tree_add_item(tree, hf_ipaccess_attr_tag, tvb, offset+2, 1, FALSE); proto_tree_add_item(tree, hf_ipaccess_attr_string, tvb, offset+3, len-1, FALSE); break; case 0x01: /* a single-byte reqest for a certain attr */ len = 0; proto_tree_add_item(tree, hf_ipaccess_attr_tag, tvb, offset+1, 1, FALSE); break; default: len = 0; proto_tree_add_text(tree, tvb, offset+1, 1, "unknown attribute type 0x%02x", attr_type); break; }; offset += len + 2; }; return offset; } /* Dissect an ip.access specific message */ static gint dissect_ipaccess(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_item *ti; proto_tree *ipaccess_tree; guint8 msg_type; msg_type = tvb_get_guint8(tvb, 0); col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(msg_type, ipaccess_msgtype_vals, "unknown 0x%02x")); if (tree) { ti = proto_tree_add_item(tree, proto_ipaccess, tvb, 0, -1, FALSE); ipaccess_tree = proto_item_add_subtree(ti, ett_ipaccess); proto_tree_add_item(ipaccess_tree, hf_ipaccess_msgtype, tvb, 0, 1, FALSE); switch (msg_type) { case 4: case 5: dissect_ipa_attr(tvb, 1, ipaccess_tree); break; } } return 1; } /* Code to actually dissect the packets */ static void dissect_ipa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { int offset = 0; col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPA"); col_clear(pinfo->cinfo, COL_INFO); while (tvb_reported_length_remaining(tvb, offset) > 0) { proto_item *ti; proto_tree *ipa_tree; guint16 len, msg_type; tvbuff_t *next_tvb; len = tvb_get_ntohs(tvb, offset); msg_type = tvb_get_guint8(tvb, offset+2); col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(msg_type, ipa_protocol_vals, "unknown 0x%02x")); if (tree) { ti = proto_tree_add_protocol_format(tree, proto_ipa, tvb, offset, len+3, "IPA protocol ip.access, type: %s", val_to_str(msg_type, ipa_protocol_vals, "unknown 0x%02x")); ipa_tree = proto_item_add_subtree(ti, ett_ipa); proto_tree_add_item(ipa_tree, hf_ipa_data_len, tvb, offset+1, 1, FALSE); proto_tree_add_item(ipa_tree, hf_ipa_protocol, tvb, offset+2, 1, FALSE); } next_tvb = tvb_new_subset(tvb, offset+3, len, len); switch (msg_type) { case ABISIP_RSL: /* hand this off to the standard A-bis RSL dissector */ call_dissector(sub_handles[SUB_RSL], next_tvb, pinfo, tree); break; case ABISIP_OML: /* hand this off to the standard A-bis OML dissector */ if (sub_handles[SUB_OML]) call_dissector(sub_handles[SUB_OML], next_tvb, pinfo, tree); break; case ABISIP_IPACCESS: dissect_ipaccess(next_tvb, pinfo, tree); break; case AIP_SCCP: /* hand this off to the standard SCCP dissector */ call_dissector(sub_handles[SUB_SCCP], next_tvb, pinfo, tree); break; } offset += len + 3; } } void proto_register_ipa(void) { static hf_register_info hf[] = { {&hf_ipa_data_len, {"DataLen", "ipa.data_len", FT_UINT8, BASE_DEC, NULL, 0x0, "The length of the data (in bytes)", HFILL} }, {&hf_ipa_protocol, {"Protocol", "ipa.protocol", FT_UINT8, BASE_HEX, VALS(ipa_protocol_vals), 0x0, "The IPA Sub-Protocol", HFILL} }, }; static hf_register_info hf_ipa[] = { {&hf_ipaccess_msgtype, {"MessageType", "ipaccess.msg_type", FT_UINT8, BASE_HEX, VALS(ipaccess_msgtype_vals), 0x0, "Type of ip.access messsage", HFILL} }, {&hf_ipaccess_attr_tag, {"Tag", "ipaccess.attr_tag", FT_UINT8, BASE_HEX, VALS(ipaccess_idtag_vals), 0x0, "Attribute Tag", HFILL} }, {&hf_ipaccess_attr_string, {"String", "ipaccess.attr_string", FT_STRING, BASE_NONE, NULL, 0x0, "String attribute", HFILL} }, }; static gint *ett[] = { &ett_ipa, &ett_ipaccess, }; proto_ipa = proto_register_protocol("GSM over IP protocol as used by ip.access", "GSM over IP", "gsm_ipa"); proto_ipaccess = proto_register_protocol("GSM over IP ip.access CCM sub-protocol", "IPA", "ipaccess"); proto_register_field_array(proto_ipa, hf, array_length(hf)); proto_register_field_array(proto_ipaccess, hf_ipa, array_length(hf_ipa)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("gsm_ipa", dissect_ipa, proto_ipa); } void proto_reg_handoff_gsm_ipa(void) { dissector_handle_t ipa_handle; sub_handles[SUB_RSL] = find_dissector("gsm_abis_rsl"); sub_handles[SUB_OML] = find_dissector("gsm_abis_oml"); sub_handles[SUB_SCCP] = find_dissector("sccp"); ipa_handle = create_dissector_handle(dissect_ipa, proto_ipa); dissector_add("tcp.port", TCP_PORT_ABISIP_PRIM, ipa_handle); dissector_add("tcp.port", TCP_PORT_ABISIP_SEC, ipa_handle); dissector_add("tcp.port", TCP_PORT_ABISIP_INST, ipa_handle); dissector_add("tcp.port", TCP_PORT_AIP_PRIM, ipa_handle); dissector_add("udp.port", TCP_PORT_ABISIP_INST, ipa_handle); }