forked from osmocom/wireshark
cc36f0b931
the following: It is now possible to enable/disable a particular protocol decoding (i.e. the protocol dissector is void or not). When a protocol is disabled, it is displayed as Data and of course, all linked sub-protocols are disabled as well. Disabling a protocol could be interesting: - in case of buggy dissectors - in case of wrong heuristics - for performance reasons - to decode the data as another protocol (TODO) Currently (if I am not wrong), all dissectors but NFS can be disabled (and dissectors that do not register protocols :-) I do not like the way the RPC sub-dissectors are disabled (in the sub-dissectors) since this could be done in the RPC dissector itself, knowing the sub-protocol hfinfo entry (this is why, I've not modified the NFS one yet). Two functions are added in proto.c : gboolean proto_is_protocol_enabled(int n); void proto_set_decoding(int n, gboolean enabled); and two MACROs which can be used in dissectors: OLD_CHECK_DISPLAY_AS_DATA(index, pd, offset, fd, tree) CHECK_DISPLAY_AS_DATA(index, tvb, pinfo, tree) See also the XXX in proto_dlg.c and proto.c around the new functions. svn path=/trunk/; revision=2267
508 lines
13 KiB
C
508 lines
13 KiB
C
/* packet-isis-snp.c
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* Routines for decoding isis complete & partial SNP and their payload
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*
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* $Id: packet-isis-snp.c,v 1.7 2000/08/13 14:08:22 deniel 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@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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*
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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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#include "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 "packet-isis-lsp.h"
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#include "packet-isis-snp.h"
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/* csnp packets */
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static int proto_isis_csnp = -1;
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static int hf_isis_csnp_pdu_length = -1;
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static gint ett_isis_csnp = -1;
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static gint ett_isis_csnp_lsp_entries = -1;
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static gint ett_isis_csnp_authentication = -1;
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static gint ett_isis_csnp_clv_unknown = -1;
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/* psnp packets */
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static int proto_isis_psnp = -1;
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static int hf_isis_psnp_pdu_length = -1;
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static gint ett_isis_psnp = -1;
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static gint ett_isis_psnp_lsp_entries = -1;
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static gint ett_isis_psnp_authentication = -1;
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static gint ett_isis_psnp_clv_unknown = -1;
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static void dissect_snp_lsp_entries(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree );
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static void dissect_l1_snp_authentication_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree );
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static void dissect_l2_snp_authentication_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree );
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static const isis_clv_handle_t clv_l1_csnp_opts[] = {
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{
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ISIS_CLV_L1_CSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_csnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L1_CSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_csnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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ISIS_CLV_L1_CSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_csnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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static const isis_clv_handle_t clv_l2_csnp_opts[] = {
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{
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ISIS_CLV_L2_CSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_csnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L2_CSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_csnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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ISIS_CLV_L2_CSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_csnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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static const isis_clv_handle_t clv_l1_psnp_opts[] = {
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{
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ISIS_CLV_L1_PSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_psnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L1_PSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_psnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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ISIS_CLV_L1_PSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_psnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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static const isis_clv_handle_t clv_l2_psnp_opts[] = {
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{
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ISIS_CLV_L2_PSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_psnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L2_PSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_psnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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ISIS_CLV_L2_PSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_psnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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/*
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* Name: dissect_snp_lsp_entries()
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*
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* Description:
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* All the snp packets use a common payload format. We have up
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* to n entries (based on length), which are made of:
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* 2 : remaining life time
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* 8 : lsp id
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* 4 : sequence number
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* 2 : checksum
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*
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* Input:
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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of payload to decode.
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* int : length of IDs in packet.
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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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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static void
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dissect_snp_lsp_entries(const u_char *pd, int offset, guint length,
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int id_length, frame_data *fd, proto_tree *tree ) {
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while ( length > 0 ) {
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if ( length < 2+id_length+2+4+2 ) {
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isis_dissect_unknown(offset, length, tree, fd,
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"Short SNP header entry (%d vs %d)", length,
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2+id_length+2+4+2 );
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return;
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}
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proto_tree_add_text(tree, NullTVB, offset, 2, "Remaining life : %d",
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pntohs(&pd[offset]));
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length -= 2;
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offset += 2;
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isis_lsp_decode_lsp_id( "LSP ID ", tree, pd,
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offset, id_length);
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length -= id_length + 2;
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offset += id_length + 2;
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proto_tree_add_text(tree, NullTVB, offset, 4,
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"LSP Sequence Number : 0x%04x",
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pntohl(&pd[offset]));
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length -= 4;
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offset += 4;
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proto_tree_add_text(tree, NullTVB, offset, 2,
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"LSP checksum : 0x%02x",
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pntohs(&pd[offset]));
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length -= 2;
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offset += 2;
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}
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}
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/*
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* Name: isis_dissect_isis_csnp()
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*
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* Description:
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* Tear apart a L1 or L2 CSNP header and then call into payload dissect
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* to pull apart the lsp id payload.
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*
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* Input:
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* int : type (l1 csnp, l2 csnp)
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* int : header length of packet.
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* int : length of IDs in packet.
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* u_char * : packet data
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* int offset : our offset into packet data.
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* frame_data * : frame data
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* proto_tree * : protocol display tree to add to. May be NULL.
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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_isis_csnp(int type, int header_length, int id_length,
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const u_char *pd, int offset, frame_data *fd, proto_tree *tree){
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proto_item *ti;
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proto_tree *csnp_tree = NULL;
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int hlen;
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guint16 pdu_length;
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int len;
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OLD_CHECK_DISPLAY_AS_DATA(proto_isis_csnp, pd, offset, fd, tree);
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hlen = 2+id_length+1+id_length+2+id_length+2;
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if (!BYTES_ARE_IN_FRAME(offset, hlen)) {
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isis_dissect_unknown(offset, hlen, tree, fd,
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"not enough capture data for header (%d vs %d)",
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hlen, END_OF_FRAME);
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return;
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_isis_csnp, NullTVB,
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offset, END_OF_FRAME, FALSE);
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csnp_tree = proto_item_add_subtree(ti, ett_isis_csnp);
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}
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pdu_length = pntohs(&pd[offset]);
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if (tree) {
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proto_tree_add_uint(csnp_tree, hf_isis_csnp_pdu_length, NullTVB,
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offset, 2, pdu_length);
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}
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offset += 2;
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if (tree) {
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proto_tree_add_text(csnp_tree, NullTVB, offset, id_length + 1,
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"Source id : %s",
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print_system_id( pd + offset, id_length + 1 ) );
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}
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offset += id_length + 1;
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if (tree) {
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isis_lsp_decode_lsp_id( "Start LSP id ", csnp_tree, pd, offset,
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id_length );
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}
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offset += id_length + 2;
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if (tree) {
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isis_lsp_decode_lsp_id( "End LSP id ", csnp_tree, pd, offset,
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id_length );
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}
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offset += id_length + 2;
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len = pdu_length - header_length;
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if (len < 0) {
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return;
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}
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/* Call into payload dissector */
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if (type == ISIS_TYPE_L1_CSNP ) {
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isis_dissect_clvs ( clv_l1_csnp_opts, len, id_length, pd,
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offset, fd, csnp_tree, ett_isis_csnp_clv_unknown );
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} else {
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isis_dissect_clvs ( clv_l2_csnp_opts, len, id_length, pd,
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offset, fd, csnp_tree, ett_isis_csnp_clv_unknown );
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}
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}
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/*
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* Name: isis_dissect_isis_psnp()
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*
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* Description:
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* Tear apart a L1 or L2 PSNP header and then call into payload dissect
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* to pull apart the lsp id payload.
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*
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* Input:
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* int : type (l1 psnp, l2 psnp)
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* int : header length of packet.
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* int : length of IDs in packet.
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* u_char * : packet data
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* int offset : our offset into packet data.
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* frame_data * : frame data
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* proto_tree * : protocol display tree to add to. May be NULL.
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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_isis_psnp(int type, int header_length, int id_length,
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const u_char *pd, int offset, frame_data *fd, proto_tree *tree){
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proto_item *ti;
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proto_tree *psnp_tree = NULL;
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int hlen;
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guint16 pdu_length;
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int len;
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OLD_CHECK_DISPLAY_AS_DATA(proto_isis_psnp, pd, offset, fd, tree);
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hlen = 2+id_length+1;
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if (!BYTES_ARE_IN_FRAME(offset, hlen)) {
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isis_dissect_unknown(offset, hlen, tree, fd,
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"not enough capture data for header (%d vs %d)",
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hlen, END_OF_FRAME);
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return;
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_isis_psnp, NullTVB,
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offset, END_OF_FRAME, FALSE);
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psnp_tree = proto_item_add_subtree(ti, ett_isis_psnp);
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}
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pdu_length = pntohs(&pd[offset]);
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if (tree) {
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proto_tree_add_uint(psnp_tree, hf_isis_psnp_pdu_length, NullTVB,
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offset, 2, pdu_length);
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}
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offset += 2;
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if (tree) {
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proto_tree_add_text(psnp_tree, NullTVB, offset, id_length + 1,
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"Source id: %s",
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print_system_id( pd + offset, id_length + 1 ) );
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}
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offset += id_length + 1;
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len = pdu_length - header_length;
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if (len < 0) {
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isis_dissect_unknown(offset, header_length, tree, fd,
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"packet header length %d went beyond packet",
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header_length );
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return;
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}
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/* Call into payload dissector */
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if (type == ISIS_TYPE_L1_CSNP ) {
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isis_dissect_clvs ( clv_l1_csnp_opts, len, id_length, pd,
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offset, fd, psnp_tree, ett_isis_psnp_clv_unknown );
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} else {
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isis_dissect_clvs ( clv_l2_csnp_opts, len, id_length, pd,
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offset, fd, psnp_tree, ett_isis_psnp_clv_unknown );
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}
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}
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/*
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* Name: dissect_L1_snp_authentication_clv()
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*
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* Description:
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* Decode for a lsp packets authenticaion clv. Calls into the
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* clv common one. An auth inside a L1 SNP is a per area password
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*
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* Input:
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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* int : length of IDs in packet.
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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*
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* Output:
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* void, will modify proto_tree if not null.
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*/
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static void
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dissect_l1_snp_authentication_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree) {
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isis_dissect_authentication_clv(pd, offset, length, fd, tree,
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"Per area authentication" );
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}
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/*
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* Name: dissect_l2_authentication_clv()
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*
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* Description:
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* Decode for a lsp packets authenticaion clv. Calls into the
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* clv common one. An auth inside a L2 LSP is a per domain password
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*
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* Input:
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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* int : length of IDs in packet.
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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*
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* Output:
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* void, will modify proto_tree if not null.
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*/
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static void
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dissect_l2_snp_authentication_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree) {
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isis_dissect_authentication_clv(pd, offset, length, fd, tree,
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"Per domain authentication" );
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}
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/*
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* Name: proto_register_isis_csnp()
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*
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* Description:
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* Register our protocol sub-sets with protocol manager.
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* NOTE: this procedure is autolinked by the makefile process that
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* builds register.c
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*
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* Input:
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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of clv we are decoding
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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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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proto_register_isis_csnp(void) {
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static hf_register_info hf[] = {
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{ &hf_isis_csnp_pdu_length,
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{ "PDU length", "isis_csnp.pdu_length", FT_UINT16,
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BASE_DEC, NULL, 0x0, "" }},
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};
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static gint *ett[] = {
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&ett_isis_csnp,
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&ett_isis_csnp_lsp_entries,
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&ett_isis_csnp_authentication,
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&ett_isis_csnp_clv_unknown,
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};
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proto_isis_csnp = proto_register_protocol(PROTO_STRING_CSNP, "isis_csnp");
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proto_register_field_array(proto_isis_csnp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/*
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* Name: proto_register_isis_psnp()
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*
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* Description:
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* Register our protocol sub-sets with protocol manager.
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* NOTE: this procedure is autolinked by the makefile process that
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* builds register.c
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*
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* Input:
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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of clv we are decoding
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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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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proto_register_isis_psnp(void) {
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static hf_register_info hf[] = {
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{ &hf_isis_psnp_pdu_length,
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{ "PDU length", "isis_psnp.pdu_length", FT_UINT16,
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BASE_DEC, NULL, 0x0, "" }},
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};
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static gint *ett[] = {
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&ett_isis_psnp,
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&ett_isis_psnp_lsp_entries,
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&ett_isis_psnp_authentication,
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&ett_isis_psnp_clv_unknown,
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};
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proto_isis_psnp = proto_register_protocol(PROTO_STRING_PSNP, "isis_psnp");
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proto_register_field_array(proto_isis_psnp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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