![Guy Harris](/assets/img/avatar_default.png)
Use the "tree_id" argument to "isis_dissect_mt_clv()" for the 2-byte MT IDs, and arrange that the two hf_ values passed as that argument actually be defined for protocol fields. Fix the loop in "isis_dissect_mt_clv()" so that it actually catches an odd byte at the end (i.e., loop until there is data at all, not until there is 1 or fewer bytes), and put that odd byte, if it exists, into the tree as a 1-byte text item, not a 2-byte text item. svn path=/trunk/; revision=5113
532 lines
13 KiB
C
532 lines
13 KiB
C
/* packet-isis-clv.c
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* Common CLV decode routines.
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*
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* $Id: packet-isis-clv.c,v 1.19 2002/04/07 23:39:00 guy Exp $
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* Stuart Stanley <stuarts@mxmail.net>
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include <epan/packet.h>
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#include "packet-osi.h"
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#include "packet-isis.h"
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#include "packet-isis-clv.h"
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#include "nlpid.h"
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/*
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* Name: isis_dissect_area_address_clv()
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*
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* Description:
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* Take an area address CLV and display it pieces. An area address
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* CLV is n, x byte hex strings.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of clv we are decoding
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_area_address_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int length)
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{
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char *sbuf;
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int mylen;
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while ( length > 0 ) {
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mylen = tvb_get_guint8(tvb, offset);
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length--;
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if (length<=0) {
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isis_dissect_unknown(tvb, tree, offset,
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"short address (no length for payload)");
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return;
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}
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if ( mylen > length) {
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isis_dissect_unknown(tvb, tree, offset,
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"short address, packet say %d, we have %d left",
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mylen, length );
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return;
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}
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/*
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* Lets turn the area address into "standard" 0000.0000.etc
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* format string.
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*/
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/* sbuf = isis_address_to_string ( tvb, offset + 1, mylen );*/
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sbuf = print_nsap_net( tvb_get_ptr(tvb, offset + 1, mylen), mylen );
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/* and spit it out */
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if ( tree ) {
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proto_tree_add_text ( tree, tvb, offset, mylen + 1,
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"Area address (%d): %s", mylen, sbuf );
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}
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offset += mylen + 1;
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length -= mylen; /* length already adjusted for len fld*/
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}
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}
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/*
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* Name: isis_dissect_authentication_clv()
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*
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* Description:
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* Take apart the CLV that hold authentication information. This
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* is currently 1 octet auth type (which must be 1) and then
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* the clear text password.
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*
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* An ISIS password has different meaning depending where it
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* is found. Thus we support a passed in prefix string to
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* use to name this.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of clv we are decoding
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* char * : Password meaning
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int length, char *meaning)
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{
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u_char pw_type;
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char sbuf[300]; /* 255 + header info area */
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char *s = sbuf;
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int auth_unsupported;
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if ( length <= 0 ) {
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return;
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}
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pw_type = tvb_get_guint8(tvb, offset);
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offset += 1;
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length--;
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auth_unsupported = FALSE;
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switch (pw_type) {
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case 1:
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s += sprintf ( s, "clear text (1), password (length %d) = ", length );
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if ( length > 0 ) {
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strncpy(s, tvb_get_ptr(tvb, offset, length), length);
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s[length] = 0;
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} else {
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strcat(s, "no clear-text password found!!!" );
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}
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break;
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case 54:
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s += sprintf ( s, "hmac-md5 (54), password (length %d) = ", length );
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if ( length == 16 ) {
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s += sprintf ( s, "0x%02x", tvb_get_guint8(tvb, offset) );
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offset += 1;
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length--;
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while (length > 0) {
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s += sprintf ( s, "%02x", tvb_get_guint8(tvb, offset) );
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offset += 1;
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length--;
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}
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s = 0;
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} else {
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strcat(s, "illegal hmac-md5 digest format (must be 16 bytes)" );
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}
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break;
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default:
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s += sprintf ( s, "type 0x%02x (0x%02x): ", pw_type, length );
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auth_unsupported=TRUE;
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break;
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}
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proto_tree_add_text ( tree, tvb, offset - 1, length + 1,
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"%s %s", meaning, sbuf );
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if ( auth_unsupported ) {
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isis_dissect_unknown(tvb, tree, offset,
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"Unknown authentication type" );
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}
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}
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/*
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* Name: isis_dissect_hostname_clv()
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*
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* Description:
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* dump the hostname information found in TLV 137
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* pls note that the hostname is not null terminated
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of clv we are decoding
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_hostname_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int length)
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{
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if ( !tree ) return; /* nothing to do! */
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if ( length == 0 ) {
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proto_tree_add_text ( tree, tvb, offset, length,
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"Hostname: --none--" );
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} else {
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proto_tree_add_text ( tree, tvb, offset, length,
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"Hostname: %.*s", length,
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tvb_get_ptr(tvb, offset, length) );
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}
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}
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void
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isis_dissect_mt_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int length,
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int tree_id)
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{
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guint16 mt_block;
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char mt_desc[60];
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while (length>0) {
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/* length can only be a multiple of 2, otherwise there is
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something broken -> so decode down until length is 1 */
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if (length!=1) {
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/* fetch two bytes */
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mt_block=tvb_get_ntohs(tvb, offset);
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/* mask out the lower 12 bits */
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switch(mt_block&0x0fff) {
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case 0:
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strcpy(mt_desc,"IPv4 unicast");
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break;
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case 1:
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strcpy(mt_desc,"In-Band Management");
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break;
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case 2:
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strcpy(mt_desc,"IPv6 unicast");
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break;
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case 3:
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strcpy(mt_desc,"Multicast");
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break;
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case 4095:
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strcpy(mt_desc,"Development, Experimental or Proprietary");
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break;
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default:
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strcpy(mt_desc,"Reserved for IETF Consensus");
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break;
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}
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proto_tree_add_uint_format ( tree, tree_id, tvb, offset, 2,
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mt_block,
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"%s Topology (0x%03x)%s%s",
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mt_desc,
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mt_block&0xfff,
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(mt_block&0x8000) ? "" : ", no sub-TLVs present",
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(mt_block&0x4000) ? ", ATT bit set" : "" );
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} else {
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proto_tree_add_text ( tree, tvb, offset, 1,
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"malformed MT-ID");
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break;
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}
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length=length-2;
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offset=offset+2;
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}
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}
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/*
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* Name: isis_dissect_ip_int_clv()
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*
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* Description:
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* Take apart the CLV that lists all the IP interfaces. The
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* meaning of which is slightly different for the different base packet
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* types, but the display is not different. What we have is n ip
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* addresses, plain and simple.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of clv we are decoding
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* int : tree id to use for proto tree.
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_ip_int_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int length, int tree_id)
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{
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if ( length <= 0 ) {
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return;
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}
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while ( length > 0 ) {
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if ( length < 4 ) {
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isis_dissect_unknown(tvb, tree, offset,
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"Short ip interface address (%d vs 4)",length );
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return;
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}
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if ( tree ) {
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proto_tree_add_item(tree, tree_id, tvb, offset, 4, FALSE);
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}
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offset += 4;
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length -= 4;
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}
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}
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/*
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* Name: isis_dissect_ipv6_int_clv()
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*
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* Description:
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* Take apart the CLV that lists all the IPv6 interfaces. The
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* meaning of which is slightly different for the different base packet
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* types, but the display is not different. What we have is n ip
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* addresses, plain and simple.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of clv we are decoding
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* int : tree id to use for proto tree.
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_ipv6_int_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int length, int tree_id)
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{
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guint8 addr [16];
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if ( length <= 0 ) {
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return;
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}
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while ( length > 0 ) {
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if ( length < 16 ) {
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isis_dissect_unknown(tvb, tree, offset,
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"Short IPv6 interface address (%d vs 16)",length );
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return;
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}
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tvb_memcpy(tvb, addr, offset, sizeof(addr));
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if ( tree ) {
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proto_tree_add_ipv6(tree, tree_id, tvb, offset, 16, addr);
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}
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offset += 16;
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length -= 16;
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}
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}
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/*
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* Name: isis_dissect_te_router_id_clv()
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*
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* Description:
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* Display the Traffic Engineering Router ID TLV #134.
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* This TLV is like the IP Interface TLV, except that
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* only _one_ IP address is present
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of clv we are decoding
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* int : tree id to use for proto tree.
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_te_router_id_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int length, int tree_id)
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{
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if ( length <= 0 ) {
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return;
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}
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if ( length != 4 ) {
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isis_dissect_unknown(tvb, tree, offset,
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"malformed Traffic Engineering Router ID (%d vs 4)",length );
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return;
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}
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if ( tree ) {
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proto_tree_add_item(tree, tree_id, tvb, offset, 4, FALSE);
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}
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}
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/*
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* Name: isis_dissect_nlpid_clv()
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*
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* Description:
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* Take apart a NLPID packet and display it. The NLPID (for intergrated
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* ISIS, contains n network layer protocol IDs that the box supports.
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* Our display buffer we use is upto 255 entries, 6 bytes per (0x00, )
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* plus 1 for zero termination. We just just 256*6 for simplicity.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of clv we are decoding
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_nlpid_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int length)
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{
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char sbuf[256*6];
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char *s = sbuf;
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int hlen = length;
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int old_offset = offset;
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if ( !tree ) return; /* nothing to do! */
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while ( length-- > 0 ) {
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if (s != sbuf ) {
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s += sprintf ( s, ", " );
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}
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s += sprintf ( s, "%s (0x%02x)",
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val_to_str(tvb_get_guint8(tvb, offset), nlpid_vals,
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"Unknown"), tvb_get_guint8(tvb, offset));
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offset++;
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}
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if ( hlen == 0 ) {
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sprintf ( sbuf, "--none--" );
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}
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proto_tree_add_text ( tree, tvb, old_offset, hlen,
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"NLPID(s): %s", sbuf );
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}
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/*
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* Name: isis_dissect_clvs()
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*
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* Description:
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* Dispatch routine to shred all the CLVs in a packet. We just
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* walk through the clv entries in the packet. For each one, we
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* search the passed in valid clv's for this protocol (opts) for
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* a matching code. If found, we add to the display tree and
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* then call the dissector. If it is not, we just post an
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* "unknown" clv entry using the passed in unknown clv tree id.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* isis_clv_handle_t * : NULL dissector terminated array of codes
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* and handlers (along with tree text and tree id's).
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* int : length of CLV area.
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* int : length of IDs in packet.
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* int : unknown clv tree id
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_clvs(tvbuff_t *tvb, proto_tree *tree, int offset,
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const isis_clv_handle_t *opts, int len, int id_length,
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int unknown_tree_id)
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{
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guint8 code;
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guint8 length;
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int q;
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proto_item *ti;
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proto_tree *clv_tree;
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char sbuf[255];
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int adj;
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while ( len > 0 ) {
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code = tvb_get_guint8(tvb, offset);
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offset += 1;
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length = tvb_get_guint8(tvb, offset);
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offset += 1;
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adj = (sizeof(code) + sizeof(length) + length);
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len -= adj;
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if ( len < 0 ) {
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isis_dissect_unknown(tvb, tree, offset,
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"Short CLV header (%d vs %d)",
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adj, len + adj );
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return;
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}
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q = 0;
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while ((opts[q].dissect != NULL )&&( opts[q].optcode != code )){
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q++;
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}
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if ( opts[q].dissect ) {
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if (tree) {
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/* adjust by 2 for code/len octets */
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snprintf ( sbuf, sizeof(sbuf), "%s (%d)",
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opts[q].tree_text, length );
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ti = proto_tree_add_text(tree, tvb, offset - 2,
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length + 2, sbuf);
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clv_tree = proto_item_add_subtree(ti,
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*opts[q].tree_id );
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} else {
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clv_tree = NULL;
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}
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opts[q].dissect(tvb, clv_tree, offset,
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id_length, length);
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} else {
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if (tree) {
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snprintf ( sbuf, sizeof(sbuf),
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"Unknown code (%d:%d)", code, length );
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ti = proto_tree_add_text(tree, tvb, offset - 2,
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length + 2, sbuf);
|
|
clv_tree = proto_item_add_subtree(ti,
|
|
unknown_tree_id );
|
|
} else {
|
|
clv_tree = NULL;
|
|
}
|
|
}
|
|
offset += length;
|
|
}
|
|
}
|
|
|