osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/packet-teredo.c

268 lines
8.2 KiB
C
Raw Blame History

/* packet-teredo.c v.1.0
* Routines for TEREDO packet disassembly
* draft-huitema-v6ops-teredo-00.txt
* Windows XP Teredo
*
* Copyright 2003, Ragi BEJJANI - 6WIND - <ragi.bejjani@6wind.com>
* Copyright 2003, Vincent JARDIN - 6WIND - <vincent.jardin@6wind.com>
*
* $Id: packet-teredo.c,v 1.4 2003/12/29 00:19:00 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/resolv.h>
#include "ipproto.h"
#include "prefs.h"
#include "packet-ip.h"
#include "tap.h"
#define UDP_PORT_TERREDO 3544
static int teredo_tap = -1;
static int proto_teredo = -1;
static int hf_teredo_orgheader = -1;
static int hf_teredo_authheader = -1;
static int hf_teredo_orgport = -1;
static int hf_teredo_orgaddr = -1;
static gint ett_teredo = -1;
typedef struct {
guint16 th_indtyp;
guint8 th_cidlen;
guint8 th_authdlen;
guint8 th_nonce[8];
guint8 th_conf;
guint8 th_ip_v_hl;
guint16 th_header;
guint16 th_orgport;
guint32 th_iporgaddr;
} e_teredohdr;
/* Place TEREDO summary in proto tree */
static gboolean teredo_summary_in_tree = TRUE;
static dissector_table_t teredo_dissector_table;
/*static heur_dissector_list_t heur_subdissector_list;*/
static dissector_handle_t data_handle;
/* Determine if there is a sub-dissector and call it. This has been */
/* separated into a stand alone routine to other protocol dissectors */
/* can call to it, ie. socks */
static void
decode_teredo_ports(tvbuff_t *tvb, int offset, packet_info *pinfo,proto_tree *tree, int th_header)
{
tvbuff_t *next_tvb;
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
if (dissector_try_port(teredo_dissector_table, th_header, next_tvb, pinfo, tree))
return;
call_dissector(data_handle,next_tvb, pinfo, tree);
}
static void
dissect_teredo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *teredo_tree;
proto_item *ti;
int offset = 0;
static e_teredohdr teredohstruct[4], *teredoh;
static int teredoh_count = 0;
proto_item *to;
proto_tree *teredo_origin_tree;
teredoh_count++;
if(teredoh_count>=4){
teredoh_count=0;
}
teredoh = &teredohstruct[teredoh_count];
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TEREDO");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
teredoh->th_header = tvb_get_ntohs(tvb, offset);
teredoh->th_ip_v_hl = tvb_get_guint8(tvb, offset);
teredoh->th_indtyp = 0;
if ( (teredoh->th_header)== 1 ) {
teredoh->th_indtyp = teredoh->th_header;
teredoh->th_cidlen = tvb_get_guint8(tvb,offset+2); /*Authentication header octet*/
teredoh->th_authdlen = tvb_get_guint8(tvb,offset+3);
tvb_memcpy(tvb,teredoh->th_nonce,offset+4,sizeof teredoh->th_nonce);
teredoh->th_conf = tvb_get_guint8(tvb,offset+12);
/*Skip over Authentication Header (fixed length-no authentication)*/
offset+=13;
teredoh->th_header = tvb_get_ntohs(tvb, offset);
teredoh->th_ip_v_hl = tvb_get_guint8(tvb, offset);
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO,
"Teredo : Tunneling IPv6 over UDP through NATs");
proto_tree_add_uint_hidden(tree, hf_teredo_authheader, tvb, offset-13, 2, teredoh->th_indtyp);
if (teredo_summary_in_tree) {
if (teredoh->th_header!=0) {
ti = proto_tree_add_protocol_format(tree, proto_teredo, tvb, offset-13, 13,
"TEREDO with Authentication encapsulation");
}
} else {
ti = proto_tree_add_item(tree, proto_teredo, tvb, offset, 13, FALSE);
}
}
if ( (teredoh->th_header)== 0 ) {
teredoh->th_orgport=tvb_get_ntohs(tvb, offset+2);
tvb_memcpy(tvb, (guint8 *)&teredoh->th_iporgaddr, offset + 4, 4);
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO,
"Teredo : Tunneling IPv6 over UDP through NATs");
if (tree) {
if (teredo_summary_in_tree) {
if (teredoh->th_indtyp==1){
to = proto_tree_add_protocol_format(tree, proto_teredo, tvb, offset-13, 13+8,
"TEREDO with Authentication and Origin Indicator encapsulation");
teredo_tree = proto_item_add_subtree(to, ett_teredo);
proto_tree_add_protocol_format(teredo_tree,proto_teredo, tvb,offset-13, 13,
"Authentication encapsulation");
ti = proto_tree_add_protocol_format(teredo_tree, proto_teredo, tvb, offset, 8,
"Origin indicator encapsulation") ;
} else {
ti = proto_tree_add_protocol_format(tree, proto_teredo, tvb, offset, 8,
"TEREDO with Origin indicator encapsulation");
}
} else {
ti = proto_tree_add_item(tree, proto_teredo, tvb, offset, 8, FALSE);
}
teredo_origin_tree = proto_item_add_subtree(ti, ett_teredo);
proto_tree_add_uint_format(teredo_origin_tree, hf_teredo_orgheader, tvb, offset, 2,
teredoh->th_header,
"Teredo Origin encapsulation header: 0x%04x",
(teredoh->th_header));
proto_tree_add_uint_format(teredo_origin_tree, hf_teredo_orgport, tvb, offset + 2, 2,
teredoh->th_orgport,
"Origin port: %u",
((teredoh->th_orgport)^(0xFFFF)));
proto_tree_add_ipv4_format(teredo_origin_tree, hf_teredo_orgaddr, tvb, offset + 4, 4,
teredoh->th_iporgaddr,
"Origin address: %s",
get_hostname((teredoh->th_iporgaddr)^(0xFFFFFFFF)));
proto_tree_add_uint_hidden(teredo_origin_tree, hf_teredo_orgheader, tvb, offset, 2,
teredoh->th_header);
proto_tree_add_uint_hidden(teredo_origin_tree, hf_teredo_orgport, tvb, offset+2, 2,
((teredoh->th_orgport)^(0xFFFF)));
proto_tree_add_ipv4_hidden(teredo_origin_tree, hf_teredo_orgaddr, tvb, offset + 4, 4,
((teredoh->th_iporgaddr)^(0xFFFFFFFF)));
};
offset+=8; /*Skip over Origin Header*/
};
if ( (hi_nibble(teredoh->th_ip_v_hl) == 6)
&& ((teredoh->th_indtyp) != 1) ) { /* checking if the first 4 bits = 6 */
if (tree) {
if (teredo_summary_in_tree) {
ti = proto_tree_add_protocol_format(tree, proto_teredo, tvb, offset, 0,"TEREDO simple encapsulation ");
}
}
offset+=0;
}
decode_teredo_ports(tvb, offset, pinfo, tree, teredoh->th_header /* , teredoh->th_orgport*/);
tap_queue_packet(teredo_tap, pinfo, teredoh);
}
void
proto_register_teredo(void)
{
static hf_register_info hf[] = {
{ &hf_teredo_authheader,
{ "Teredo Authentication packet Header","teredo.authheader", FT_UINT16, BASE_DEC, NULL, 0x0,"", HFILL }},
{ &hf_teredo_orgheader,
{ "Teredo Origin encapsulation header","teredo.orgheader", FT_UINT16, BASE_DEC, NULL, 0x0,"", HFILL }},
{ &hf_teredo_orgport,
{ "Origin Port", "teredo.orgport", FT_UINT16, BASE_DEC, NULL, 0x0,"", HFILL }},
{ &hf_teredo_orgaddr,
{ "Origin IPv4 address","teredo.orgaddr", FT_IPv4, BASE_NONE, NULL, 0x0,"", HFILL }},
};
static gint *ett[] = {
&ett_teredo,
};
proto_teredo = proto_register_protocol("TEREDO Tunneling IPv6 over UDP through NATs",
"TEREDO", "teredo");
proto_register_field_array(proto_teredo, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* subdissector code */
teredo_dissector_table = register_dissector_table("teredo","TEREDO ", FT_UINT16, BASE_DEC);
/* register_heur_dissector_list("teredo.heur", &heur_subdissector_list); */
}
void
proto_reg_handoff_teredo(void)
{
dissector_handle_t teredo_handle;
teredo_handle = create_dissector_handle(dissect_teredo, proto_teredo);
data_handle = find_dissector("ipv6");
teredo_tap = register_tap("teredo");
dissector_add("udp.port", UDP_PORT_TERREDO, teredo_handle);
}
View Git Blame Copy Permalink