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/* packet-gsm_ipa.c
* Routines for packet dissection of ip.access GSM over IP
* Copyright 2009 by Harald Welte <laforge@gnumonks.org>
* Copyright 2009, 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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 <glib.h>
#include <epan/packet.h>
#include <epan/ipproto.h>
/* 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_MAX 0x20
#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)
{
gint remaining;
gint header_length = 3;
int offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPA");
col_clear(pinfo->cinfo, COL_INFO);
while ((remaining = 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"));
/*
* The IPA header is different depending on the transport protocol.
* With UDP there seems to be a fourth byte for the IPA header.
* We attempt to detect this by checking if the length from the
* header + four bytes of the IPA header equals the remaining size.
*/
if ((pinfo->ipproto == IP_PROTO_UDP) && (len + 4 == remaining)) {
header_length++;
}
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_ipa,
tvb, offset, len+header_length,
"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, 2, FALSE);
proto_tree_add_item(ipa_tree, hf_ipa_protocol,
tvb, offset+2, 1, FALSE);
}
next_tvb = tvb_new_subset(tvb, offset+header_length, len, len);
switch (msg_type) {
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;
default:
if (msg_type < ABISIP_RSL_MAX) {
/* hand this off to the standard A-bis RSL dissector */
call_dissector(sub_handles[SUB_RSL], next_tvb, pinfo, tree);
}
break;
}
offset += len + header_length;
}
}
void proto_register_ipa(void)
{
static hf_register_info hf[] = {
{&hf_ipa_data_len,
{"DataLen", "ipa.data_len",
FT_UINT16, 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);
}
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