forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
The preferences are still supported for backwards compatibility, but the heuristic_protos file has final say on the "preference" to enable/disable a heuristic dissector. Also add parameter to heur_dissector_add() for the "default" enable/disable of a heuristic dissector. With this parameter, a few more (presumably weak) heuristic dissectors have been "registered" but of course default to being disabled. Change-Id: I51bebb2146ef3fbb8418d4f5c7f2cb2b58003a22 Reviewed-on: https://code.wireshark.org/review/9610 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Roland Knall <rknall@gmail.com> Reviewed-by: Hadriel Kaplan <hadrielk@yahoo.com> Reviewed-by: Michael Mann <mmann78@netscape.net>
423 lines
11 KiB
C
423 lines
11 KiB
C
/* packet-teredo.c v.1.0
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* Routines for Teredo packets disassembly
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* draft-huitema-v6ops-teredo-02.txt
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*
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* Copyright 2003, Ragi BEJJANI - 6WIND - <ragi.bejjani@6wind.com>
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* Copyright 2003, Vincent JARDIN - 6WIND - <vincent.jardin@6wind.com>
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* Copyright 2004, Remi DENIS-COURMONT
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/tap.h>
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#define UDP_PORT_TEREDO 3544
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void proto_reg_handoff_teredo(void);
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void proto_register_teredo(void);
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static int teredo_tap = -1;
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static int proto_teredo = -1;
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static int hf_teredo_auth = -1;
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static int hf_teredo_auth_idlen = -1;
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static int hf_teredo_auth_aulen = -1;
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static int hf_teredo_auth_id = -1;
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static int hf_teredo_auth_value = -1;
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static int hf_teredo_auth_nonce = -1;
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static int hf_teredo_auth_conf = -1;
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static int hf_teredo_orig = -1;
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static int hf_teredo_orig_port = -1;
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static int hf_teredo_orig_addr = -1;
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static gint ett_teredo = -1;
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static gint ett_teredo_auth = -1, ett_teredo_orig = -1;
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typedef struct {
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guint16 th_indtyp;
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guint8 th_cidlen;
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guint8 th_authdlen;
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guint8 th_nonce[8];
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guint8 th_conf;
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guint8 th_ip_v_hl;
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guint16 th_header;
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guint16 th_orgport;
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guint32 th_iporgaddr;
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} e_teredohdr;
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static dissector_table_t teredo_dissector_table;
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/*static heur_dissector_list_t heur_subdissector_list;*/
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static dissector_handle_t data_handle;
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static int
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parse_teredo_auth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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int offset, e_teredohdr *teredoh)
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{
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guint idlen, aulen;
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col_append_sep_str (pinfo->cinfo, COL_INFO, ", ",
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"Authentication header");
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teredoh->th_indtyp = 1;
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offset += 2;
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idlen = tvb_get_guint8(tvb, offset);
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teredoh->th_cidlen = idlen;
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offset++;
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aulen = tvb_get_guint8(tvb, offset);
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teredoh->th_authdlen = aulen;
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offset++;
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if (tree) {
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proto_item *ti;
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ti = proto_tree_add_item(tree, hf_teredo_auth, tvb, offset-4,
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13 + idlen + aulen, ENC_NA);
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tree = proto_item_add_subtree(ti, ett_teredo_auth);
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proto_tree_add_item(tree, hf_teredo_auth_idlen, tvb,
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offset - 2, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_teredo_auth_aulen, tvb,
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offset - 1, 1, ENC_BIG_ENDIAN);
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/* idlen is usually zero */
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if (idlen) {
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proto_tree_add_item(tree, hf_teredo_auth_id, tvb,
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offset, idlen, ENC_NA);
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offset += idlen;
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}
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/* aulen is usually zero */
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if (aulen) {
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proto_tree_add_item(tree, hf_teredo_auth_value, tvb,
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offset, aulen, ENC_NA);
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offset += aulen;
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}
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proto_tree_add_item(tree, hf_teredo_auth_nonce, tvb,
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offset, 8, ENC_NA);
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offset += 8;
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proto_tree_add_item(tree, hf_teredo_auth_conf, tvb,
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offset, 1, ENC_NA);
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offset++;
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}
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else
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offset += idlen + aulen + 9;
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tvb_memcpy(tvb, teredoh->th_nonce, offset - 9, 8);
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teredoh->th_conf = tvb_get_guint8(tvb, offset - 1);
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return offset;
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}
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static int
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parse_teredo_orig(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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int offset, e_teredohdr *teredoh)
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{
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proto_item *ti = NULL;
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col_append_sep_str (pinfo->cinfo, COL_INFO, ", ",
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"Origin indication");
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if (tree) {
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ti = proto_tree_add_item(tree, hf_teredo_orig, tvb, offset,
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8, ENC_NA);
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tree = proto_item_add_subtree(ti, ett_teredo_orig);
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}
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offset += 2;
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teredoh->th_orgport = tvb_get_ntohs(tvb, offset);
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if (tree) {
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/*
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* The "usual arithmetic conversions" will convert
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* "teredoh->th_orgport" to an "int" (because all
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* "unsigned short" values will fit in an "int"),
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* which will zero-extend it. This means that
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* complementing it will turn all the zeroes in
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* the upper 16 bits into ones; we just want the
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* lower 16 bits (containing the port number)
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* complemented, with the result zero-extended.
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*
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* That's what the cast is for.
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*/
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proto_tree_add_uint(tree, hf_teredo_orig_port, tvb,
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offset, 2,
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(guint16)~teredoh->th_orgport);
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}
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offset += 2;
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teredoh->th_iporgaddr = tvb_get_ipv4(tvb, offset);
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if (tree) {
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proto_tree_add_ipv4(tree, hf_teredo_orig_addr, tvb,
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offset, 4, ~teredoh->th_iporgaddr);
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}
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offset += 4;
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return offset;
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}
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/* Determine if there is a sub-dissector and call it. This has been */
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/* separated into a stand alone routine to other protocol dissectors */
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/* can call to it, ie. socks */
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static void
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decode_teredo_ports(tvbuff_t *tvb, int offset, packet_info *pinfo,proto_tree *tree, int th_header)
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{
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tvbuff_t *next_tvb;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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if (dissector_try_uint(teredo_dissector_table, th_header, next_tvb, pinfo, tree))
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return;
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call_dissector(data_handle,next_tvb, pinfo, tree);
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}
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static void
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dissect_teredo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *teredo_tree;
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proto_item *ti;
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int offset = 0;
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static e_teredohdr teredohstruct[4], *teredoh;
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static int teredoh_count = 0;
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teredoh_count++;
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if(teredoh_count>=4){
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teredoh_count=0;
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}
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teredoh = &teredohstruct[teredoh_count];
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Teredo");
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_teredo, tvb, 0, -1, ENC_NA);
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teredo_tree = proto_item_add_subtree(ti, ett_teredo);
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}
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else
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teredo_tree = NULL;
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teredoh->th_header = tvb_get_ntohs(tvb, offset);
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if (teredoh->th_header == 1) {
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offset = parse_teredo_auth(tvb, pinfo, teredo_tree,
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offset, teredoh);
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teredoh->th_header = tvb_get_ntohs(tvb, offset);
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}
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else
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teredoh->th_indtyp = 0;
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if ( teredoh->th_header == 0 ) {
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offset = parse_teredo_orig(tvb, pinfo, teredo_tree,
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offset, teredoh);
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}
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teredoh->th_ip_v_hl = tvb_get_guint8(tvb, offset);
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decode_teredo_ports(tvb, offset, pinfo, tree, teredoh->th_header /* , teredoh->th_orgport*/);
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tap_queue_packet(teredo_tap, pinfo, teredoh);
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}
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static gboolean
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dissect_teredo_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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guint16 val;
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int offset = 0;
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if (tvb_captured_length_remaining(tvb, offset) < 40)
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return FALSE;
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val = tvb_get_ntohs(tvb, offset);
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if (val == 1) /* possible auth header */
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{
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guint8 idlen, aulen;
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offset += 2;
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idlen = tvb_get_guint8(tvb, offset);
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offset++;
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aulen = tvb_get_guint8(tvb, offset);
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offset += 10;
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if (tvb_captured_length_remaining(tvb, offset) < idlen + aulen + 40)
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return FALSE;
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offset += idlen + aulen;
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val = tvb_get_ntohs(tvb, offset);
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}
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if (val == 0) /* origin indication */
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{
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offset += 8;
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if (tvb_captured_length_remaining(tvb, offset) < 40)
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return FALSE;
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val = tvb_get_ntohs(tvb, offset);
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}
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/*
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* We have to check upper-layer packet a little bit otherwise we will
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* match -almost- *ANY* packet.
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* These checks are in the Teredo specification by the way.
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* Unfortunately, that will cause false-negative if the snaplen is too
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* short to get the packet entirely.
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*/
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if ((val >> 12) == 6) /* IPv6 header */
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{
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/* checks IPv6 payload length */
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val = tvb_get_ntohs(tvb, offset + 4);
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offset += 40;
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if (val > 65467)
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return FALSE; /* length too big for Teredo */
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if (tvb_reported_length_remaining(tvb, offset) != val)
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return FALSE; /* length mismatch */
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dissect_teredo (tvb, pinfo, tree);
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return TRUE;
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}
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return FALSE; /* not an IPv6 packet */
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}
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void
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proto_register_teredo(void)
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{
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static hf_register_info hf[] = {
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/* Authentication header */
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{ &hf_teredo_auth,
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{ "Teredo Authentication header", "teredo.auth",
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FT_NONE, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_teredo_auth_idlen,
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{ "Client identifier length", "teredo.auth.idlen",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Client identifier length (ID-len)", HFILL }},
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{ &hf_teredo_auth_aulen,
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{ "Authentication value length", "teredo.auth.aulen",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Authentication value length (AU-len)", HFILL }},
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{ &hf_teredo_auth_id,
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{ "Client identifier", "teredo.auth.id",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Client identifier (ID)", HFILL }},
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{ &hf_teredo_auth_value,
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{ "Authentication value", "teredo.auth.value",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Authentication value (hash)", HFILL }},
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{ &hf_teredo_auth_nonce,
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{ "Nonce value", "teredo.auth.nonce",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Nonce value prevents spoofing Teredo server.",
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HFILL }},
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{ &hf_teredo_auth_conf,
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{ "Confirmation byte", "teredo.auth.conf",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Confirmation byte is zero upon successful authentication.",
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HFILL }},
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/* Origin indication */
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{ &hf_teredo_orig,
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{ "Teredo Origin Indication header", "teredo.orig",
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FT_NONE, BASE_NONE, NULL, 0x0,
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"Teredo Origin Indication", HFILL }},
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{ &hf_teredo_orig_port,
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{ "Origin UDP port", "teredo.orig.port",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_teredo_orig_addr,
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{ "Origin IPv4 address", "teredo.orig.addr",
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FT_IPv4, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_teredo, &ett_teredo_auth, &ett_teredo_orig
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};
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module_t *teredo_module;
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proto_teredo = proto_register_protocol(
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"Teredo IPv6 over UDP tunneling", "Teredo", "teredo");
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proto_register_field_array(proto_teredo, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* subdissector code */
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teredo_dissector_table = register_dissector_table("teredo","Teredo ", FT_UINT16, BASE_DEC);
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teredo_module = prefs_register_protocol(proto_teredo, NULL);
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prefs_register_obsolete_preference(teredo_module, "heuristic_teredo");
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}
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void
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proto_reg_handoff_teredo(void)
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{
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dissector_handle_t teredo_handle;
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teredo_handle = create_dissector_handle(dissect_teredo, proto_teredo);
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data_handle = find_dissector("ipv6");
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teredo_tap = register_tap("teredo");
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dissector_add_uint("udp.port", UDP_PORT_TEREDO, teredo_handle);
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heur_dissector_add("udp", dissect_teredo_heur, "Teredo over UDP", "teredo_udp", proto_teredo, HEURISTIC_DISABLE);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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