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wireshark/packet-stun.c

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/* packet-stun.c
* Routines for Simple Traversal of UDP Through NAT dissection
* Copyright 2003, Shiang-Ming Huang <smhuang@pcs.csie.nctu.edu.tw>
*
* $Id: packet-stun.c,v 1.4 2004/01/04 20:44:50 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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.
*
* Please refer to RFC 3489 for protocol detail.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include <epan/packet.h>
/* Initialize the protocol and registered fields */
static int proto_stun = -1;
static int hf_stun_type = -1; /* STUN message header */
static int hf_stun_length = -1;
static int hf_stun_id = -1;
static int hf_stun_att = -1;
static int stun_att_type = -1; /* STUN attribute fields */
static int stun_att_length = -1;
static int stun_att_value = -1;
static int stun_att_family = -1;
static int stun_att_ip = -1;
static int stun_att_port = -1;
static int stun_att_change_ip = -1;
static int stun_att_change_port = -1;
static int stun_att_unknown = -1;
static int stun_att_error_class = -1;
static int stun_att_error_number = -1;
static int stun_att_error_reason = -1;
/* Message Types */
#define BINDING_REQUEST 0x0001
#define BINDING_RESPONSE 0x0101
#define BINDING_ERROR_RESPONSE 0x0111
#define SHARED_SECRET_REQUEST 0x0002
#define SHARED_SECRET_RESPONSE 0x0102
#define SHARED_SECRET_ERROR_RESPONSE 0x1112
/* Attribute Types */
#define MAPPED_ADDRESS 0x0001
#define RESPONSE_ADDRESS 0x0002
#define CHANGE_REQUEST 0x0003
#define SOURCE_ADDRESS 0x0004
#define CHANGED_ADDRESS 0x0005
#define USERNAME 0x0006
#define PASSWORD 0x0007
#define MESSAGE_INTEGRITY 0x0008
#define ERROR_CODE 0x0009
#define UNKNOWN_ATTRIBUTES 0x000a
#define REFLECTED_FROM 0x000b
/* Initialize the subtree pointers */
static gint ett_stun = -1;
static gint ett_stun_att = -1;
#define UDP_PORT_STUN 3478
#define TCP_PORT_STUN 3478
#define STUN_HDR_LEN 20 /* STUN message header length */
#define ATTR_HDR_LEN 4 /* STUN attribute header length */
static const true_false_string set_flag = {
"SET",
"NOT SET"
};
static const value_string messages[] = {
{BINDING_REQUEST, "Binding Request"},
{BINDING_RESPONSE, "Binding Response"},
{BINDING_ERROR_RESPONSE, "Binding Error Response"},
{SHARED_SECRET_REQUEST, "Shared Secret Request"},
{SHARED_SECRET_RESPONSE, "Shared Secret Response"},
{SHARED_SECRET_ERROR_RESPONSE, "Shared Secret Error Response"},
{0x00, NULL}
};
static const value_string attributes[] = {
{MAPPED_ADDRESS, "MAPPED-ADDRESS"},
{RESPONSE_ADDRESS, "RESPONSE-ADDRESS"},
{CHANGE_REQUEST, "CHANGE-REQUEST"},
{SOURCE_ADDRESS, "SOURCE-ADDRESS"},
{CHANGED_ADDRESS, "CHANGED-ADDRESS"},
{USERNAME, "USERNAME"},
{PASSWORD, "PASSWORD"},
{MESSAGE_INTEGRITY, "MESSAGE-INTEGRITY"},
{ERROR_CODE, "ERROR-CODE"},
{REFLECTED_FROM, "REFLECTED-FROM"},
{0x00, NULL}
};
static const value_string attributes_family[] = {
{0x0001, "IPv4"},
{0x00, NULL}
};
static int
dissect_stun(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_item *ta;
proto_tree *stun_tree;
proto_tree *att_tree;
guint16 att_type;
guint16 att_length;
guint16 offset;
/*
* First check if the frame is really meant for us.
*/
/* First, make sure we have enough data to do the check. */
if (!tvb_bytes_exist(tvb, 0, STUN_HDR_LEN))
return 0;
att_type = tvb_get_ntohs(tvb, 0);
/* check if message type is correct */
if( (att_type != BINDING_REQUEST) &&
(att_type != BINDING_RESPONSE) &&
(att_type != BINDING_ERROR_RESPONSE) &&
(att_type != SHARED_SECRET_REQUEST) &&
(att_type != SHARED_SECRET_RESPONSE) &&
(att_type != SHARED_SECRET_ERROR_RESPONSE)
)
return 0;
att_length = tvb_get_ntohs(tvb, 2);
/* check if payload enough */
if (!tvb_bytes_exist(tvb, 0, STUN_HDR_LEN+att_length))
return 0;
if(tvb_bytes_exist(tvb, 0, STUN_HDR_LEN+att_length+1))
return 0;
/* The message seems to be a valid STUN message! */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "STUN");
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
col_add_fstr(pinfo->cinfo, COL_INFO, "Message : %s",
(att_type==BINDING_REQUEST)?"Binding Request":
(att_type==BINDING_RESPONSE)?"Binding Response":
(att_type==BINDING_ERROR_RESPONSE)?"Binding Error Response":
(att_type==SHARED_SECRET_REQUEST)?"Shared Secret Request":
(att_type==SHARED_SECRET_RESPONSE)?"Shared Secret Response":
(att_type==SHARED_SECRET_ERROR_RESPONSE)?"Shared Secret Error Response":"UNKNOWN"
);
}
if (tree) {
ti = proto_tree_add_item(tree, proto_stun, tvb, 0, -1, FALSE);
stun_tree = proto_item_add_subtree(ti, ett_stun);
proto_tree_add_item(stun_tree, hf_stun_type, tvb, 0, 2, FALSE);
proto_tree_add_item(stun_tree, hf_stun_length, tvb, 2, 2, FALSE);
proto_tree_add_item(stun_tree, hf_stun_id, tvb, 4, 16, FALSE);
ta = proto_tree_add_item(stun_tree, hf_stun_att, tvb, STUN_HDR_LEN, -1, FALSE);
att_tree = proto_item_add_subtree(ta, ett_stun_att);
offset = STUN_HDR_LEN;
while(1){
if( !tvb_bytes_exist(tvb, offset, ATTR_HDR_LEN) ) /* no data anymore */
break;
att_type = tvb_get_ntohs(tvb, offset); /* Type field in attribute header */
att_length = tvb_get_ntohs(tvb, offset+2); /* Length field in attribute header */
switch( att_type ){
case MAPPED_ADDRESS:
case RESPONSE_ADDRESS:
case SOURCE_ADDRESS:
case CHANGED_ADDRESS:
case REFLECTED_FROM:
proto_tree_add_item(att_tree, stun_att_type, tvb, offset, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_length, tvb, offset+2, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_family, tvb, offset+5, 1, FALSE);
proto_tree_add_item(att_tree, stun_att_port, tvb, offset+6, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_ip, tvb, offset+8, 4, FALSE);
offset = offset+(ATTR_HDR_LEN+att_length);
break;
case CHANGE_REQUEST:
proto_tree_add_item(att_tree, stun_att_type, tvb, offset, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_length, tvb, offset+2, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_change_ip, tvb, offset+4, 4, FALSE);
proto_tree_add_item(att_tree, stun_att_change_port, tvb, offset+4, 4, FALSE);
offset = offset+(ATTR_HDR_LEN+att_length);
break;
case USERNAME:
case PASSWORD:
case MESSAGE_INTEGRITY:
proto_tree_add_item(att_tree, stun_att_type, tvb, offset, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_length, tvb, offset+2, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_value, tvb, offset+4, att_length, FALSE);
offset = offset+(ATTR_HDR_LEN+att_length);
break;
case ERROR_CODE:
proto_tree_add_item(att_tree, stun_att_type, tvb, offset, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_length, tvb, offset+2, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_error_class, tvb, offset+6, 1, FALSE);
proto_tree_add_item(att_tree, stun_att_error_number, tvb, offset+7, 1, FALSE);
proto_tree_add_item(att_tree, stun_att_error_reason, tvb, offset+8, (att_length-4), FALSE);
offset = offset+(ATTR_HDR_LEN+att_length);
break;
case UNKNOWN_ATTRIBUTES:
proto_tree_add_item(att_tree, stun_att_type, tvb, offset, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_length, tvb, offset+2, 2, FALSE);
offset = offset + ATTR_HDR_LEN;
while(tvb_bytes_exist(tvb, offset, 4)){ /* UNKNOWN-ATTRIBUTES is 4 bytes aligned */
proto_tree_add_item(att_tree, stun_att_unknown, tvb, offset, 2, FALSE);
proto_tree_add_item(att_tree, stun_att_unknown, tvb, offset+2, 2, FALSE);
offset = offset + 4;
}
break;
default:
return tvb_length(tvb);
}
}
}
return tvb_length(tvb);
}
static gboolean
dissect_stun_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
if (dissect_stun(tvb, pinfo, tree) == 0)
return FALSE;
return TRUE;
}
void
proto_register_stun(void)
{
static hf_register_info hf[] = {
{ &hf_stun_type,
{ "Message Type", "stun.type", FT_UINT16,
BASE_HEX, VALS(messages), 0x0, "", HFILL }
},
{ &hf_stun_length,
{ "Message Length", "stun.length", FT_UINT16,
BASE_HEX, NULL, 0x0, "", HFILL }
},
{ &hf_stun_id,
{ "Message Transaction ID", "stun.id", FT_BYTES,
BASE_HEX, NULL, 0x0, "", HFILL }
},
{ &hf_stun_att,
{ "Attributes", "stun.att", FT_NONE,
0, NULL, 0x0, "", HFILL }
},
/* ////////////////////////////////////// */
{ &stun_att_type,
{ "Attribute Type", "stun.att.type", FT_UINT16,
BASE_HEX, VALS(attributes), 0x0, "", HFILL }
},
{ &stun_att_length,
{ "Attribute Length", "stun.att.length", FT_UINT16,
BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &stun_att_value,
{ "Value", "stun.att.value", FT_BYTES,
BASE_HEX, NULL, 0x0, "", HFILL }
},
{ &stun_att_family,
{ "Protocol Family", "stun.att.family", FT_UINT16,
BASE_HEX, VALS(attributes_family), 0x0, "", HFILL }
},
{ &stun_att_ip,
{ "IP", "stun.att.ip", FT_IPv4,
BASE_NONE, NULL, 0x0, "", HFILL }
},
{ &stun_att_port,
{ "Port", "stun.att.port", FT_UINT16,
BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &stun_att_change_ip,
{ "Change IP","stun.att.change.ip", FT_BOOLEAN,
16, TFS(&set_flag), 0x0004, "", HFILL}
},
{ &stun_att_change_port,
{ "Change Port","stun.att.change.port", FT_BOOLEAN,
16, TFS(&set_flag), 0x0002, "", HFILL}
},
{ &stun_att_unknown,
{ "Unknown Attribute","stun.att.unknown", FT_UINT16,
BASE_HEX, NULL, 0x0, "", HFILL}
},
{ &stun_att_error_class,
{ "Error Class","stun.att.error.class", FT_UINT8,
BASE_DEC, NULL, 0x07, "", HFILL}
},
{ &stun_att_error_number,
{ "Error Code","stun.att.error", FT_UINT8,
BASE_DEC, NULL, 0x0, "", HFILL}
},
{ &stun_att_error_reason,
{ "Error Reason Phase","stun.att.error.reason", FT_STRING,
BASE_NONE, NULL, 0x0, "", HFILL}
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_stun,
&ett_stun_att,
};
/* Register the protocol name and description */
proto_stun = proto_register_protocol("Simple Traversal of UDP Through NAT",
"STUN", "stun");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_stun, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_stun(void)
{
dissector_handle_t stun_handle;
stun_handle = new_create_dissector_handle(dissect_stun, proto_stun);
dissector_add("tcp.port", TCP_PORT_STUN, stun_handle);
dissector_add("udp.port", UDP_PORT_STUN, stun_handle);
heur_dissector_add("udp", dissect_stun_heur, proto_stun);
heur_dissector_add("tcp", dissect_stun_heur, proto_stun);
}
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