forked from osmocom/wireshark
![Gilbert Ramirez](/assets/img/avatar_default.png)
Also move ncp222.py, x11-fields, process-x11-fields.pl, make-reg-dotc, and make-reg-dotc.py. Adjust #include lines in files that include packet-*.h files. svn path=/trunk/; revision=11410
1545 lines
39 KiB
C
1545 lines
39 KiB
C
/*
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XXX all this offset>>3 and calculations of bytes in the tvb everytime
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we put something in the tree is just silly. should be replaced with some
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proper helper routines
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*/
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/* packet-per.c
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* Routines for dissection of ASN.1 Aligned PER
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* 2003 Ronnie Sahlberg
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*
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* $Id$
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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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#include <glib.h>
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#include <epan/packet.h>
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#include <stdio.h>
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#include <string.h>
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#include "prefs.h"
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#include "packet-per.h"
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static int proto_per = -1;
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static int hf_per_GeneralString_length = -1;
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static int hf_per_extension_bit = -1;
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static int hf_per_extension_present_bit = -1;
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static int hf_per_choice_extension = -1;
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static int hf_per_num_sequence_extensions = -1;
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static int hf_per_small_number_bit = -1;
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static int hf_per_optional_field_bit = -1;
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static int hf_per_sequence_of_length = -1;
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static int hf_per_object_identifier_length = -1;
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static int hf_per_open_type_length = -1;
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static int hf_per_octet_string_length = -1;
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static int hf_per_bit_string_length = -1;
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static gint ett_per_sequence_of_item = -1;
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/*
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#define DEBUG_ENTRY(x) \
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printf("#%d %s tvb:0x%08x\n",pinfo->fd->num,x,(int)tvb);
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*/
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#define DEBUG_ENTRY(x) \
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;
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/* whether the PER helpers should put the internal PER fields into the tree
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or not.
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*/
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static guint display_internal_per_fields = FALSE;
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static const true_false_string tfs_extension_present_bit = {
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"",
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""
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};
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static const true_false_string tfs_extension_bit = {
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"Extension bit is set",
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"Extension bit is clear"
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};
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static const true_false_string tfs_small_number_bit = {
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"The number is small, 0-63",
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"The number is large, >63"
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};
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static const true_false_string tfs_optional_field_bit = {
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"",
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""
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};
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/* 10.9 */
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/* this decodes and returns a length determinant according to 10.9 */
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guint32
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dissect_per_length_determinant(tvbuff_t *tvb, guint32 offset, packet_info *pinfo _U_, proto_tree *tree, int hf_index, guint32 *length)
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{
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guint8 byte;
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guint32 len;
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if(!length){
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length=&len;
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}
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/* byte aligned */
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if(offset&0x07){
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offset=(offset&0xfffffff8)+8;
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}
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byte=tvb_get_guint8(tvb, offset>>3);
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offset+=8;
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if((byte&0x80)==0){
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*length=byte;
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if(hf_index!=-1){
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proto_tree_add_uint(tree, hf_index, tvb, (offset>>3)-1, 1, *length);
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}
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return offset;
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}
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if((byte&0xc0)==0x80){
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*length=(byte&0x3f);
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*length=((*length)<<8)+tvb_get_guint8(tvb, offset>>3);
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offset+=8;
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if(hf_index!=-1){
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proto_tree_add_uint(tree, hf_index, tvb, (offset>>3)-2, 2, *length);
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}
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return offset;
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}
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PER_NOT_DECODED_YET("10.9.3.8.1");
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return offset;
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}
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/* 10.6 normally small non-negative whole number */
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static guint32
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dissect_per_normally_small_nonnegative_whole_number(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, guint32 *length)
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{
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gboolean small_number;
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guint32 len;
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DEBUG_ENTRY("dissect_per_normally_small_nonnegative_whole_number");
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if(!length){
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length=&len;
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}
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offset=dissect_per_boolean(tvb, offset, pinfo, tree, hf_per_small_number_bit, &small_number, NULL);
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if(!small_number){
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int i;
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/* 10.6.1 */
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*length=0;
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for(i=0;i<6;i++){
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offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &small_number, NULL);
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*length<<=1;
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if(small_number){
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*length|=1;
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}
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}
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if(hf_index!=-1){
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if((offset&0x07)<7){
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proto_tree_add_uint(tree, hf_index, tvb, (offset>>3)-1, 1, *length);
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} else {
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proto_tree_add_uint(tree, hf_index, tvb, (offset>>3), 1, *length);
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}
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}
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return offset;
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}
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/* 10.6.2 */
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offset=dissect_per_length_determinant(tvb, offset, pinfo, tree, hf_index, length);
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return offset;
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}
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/* this function reads a GeneralString */
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/* currently based on pure guesswork since RFC2833 didnt tell me much
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i guess that the PER encoding for this is a normally-small-whole-number
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followed by a ascii string.
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based on pure guesswork. it looks ok in the only capture i have where
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there is a 1 byte general string encoded
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*/
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guint32
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dissect_per_GeneralString(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index)
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{
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proto_tree *etr=NULL;
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guint32 length;
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if(display_internal_per_fields){
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etr=tree;
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}
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offset=dissect_per_length_determinant(tvb, offset, pinfo, etr, hf_per_GeneralString_length, &length);
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proto_tree_add_item(tree, hf_index, tvb, offset>>3, length, FALSE);
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offset+=length*8;
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return offset;
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}
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/* 19 this function dissects a sequence of */
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static guint32
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dissect_per_sequence_of_helper(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int (*func)(tvbuff_t *, int , packet_info *, proto_tree *), guint32 length)
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{
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guint32 i;
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DEBUG_ENTRY("dissect_per_sequence_of_helper");
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for(i=0;i<length;i++){
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guint32 lold_offset=offset;
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proto_item *litem;
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proto_tree *ltree;
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litem=proto_tree_add_text(tree, tvb, offset>>3, 0, "Item %d", i);
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ltree=proto_item_add_subtree(litem, ett_per_sequence_of_item);
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offset=(*func)(tvb, offset, pinfo, ltree);
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proto_item_set_len(litem, (offset>>3)!=(lold_offset>>3)?(offset>>3)-(lold_offset>>3):1);
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}
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return offset;
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}
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guint32
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dissect_per_sequence_of(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *parent_tree, int hf_index, gint ett_index, int (*func)(tvbuff_t *, int , packet_info *, proto_tree *))
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{
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proto_item *item;
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proto_tree *tree;
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guint32 old_offset=offset;
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guint32 length;
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proto_tree *etr = NULL;
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DEBUG_ENTRY("dissect_per_sequence_of");
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item=proto_tree_add_item(parent_tree, hf_index, tvb, offset>>3, 0, FALSE);
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tree=proto_item_add_subtree(item, ett_index);
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/* semi-constrained whole number for number of elements */
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/* each element encoded as 10.9 */
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if(display_internal_per_fields){
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etr=tree;
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}
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offset=dissect_per_length_determinant(tvb, offset, pinfo, etr, hf_per_sequence_of_length, &length);
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offset=dissect_per_sequence_of_helper(tvb, offset, pinfo, tree, func, length);
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proto_item_set_len(item, (offset>>3)!=(old_offset>>3)?(offset>>3)-(old_offset>>3):1);
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return offset;
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}
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/* dissect a constrained IA5String that consists of the full ASCII set,
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i.e. no FROM stuff limiting the alphabet
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*/
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guint32
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dissect_per_IA5String(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, int min_len, int max_len)
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{
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offset=dissect_per_octet_string(tvb, offset, pinfo, tree, hf_index, min_len, max_len, NULL, NULL);
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return offset;
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}
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/* XXX we dont do >64k length strings yet */
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guint32
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dissect_per_restricted_character_string(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, int min_len, int max_len, char *alphabet, int alphabet_length)
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{
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guint32 length;
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gboolean byte_aligned;
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static char str[1024];
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guint char_pos;
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int bits_per_char;
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guint32 old_offset;
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DEBUG_ENTRY("dissect_per_restricted_character_string");
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/* xx.x if the length is 0 bytes there will be no encoding */
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if(max_len==0){
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return offset;
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}
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if(min_len==-1){
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min_len=0;
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}
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/* xx.x */
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length=max_len;
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if(min_len!=max_len){
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proto_tree *etr = NULL;
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if(display_internal_per_fields){
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etr=tree;
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}
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offset=dissect_per_constrained_integer(tvb, offset, pinfo,
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etr, hf_per_octet_string_length, min_len, max_len,
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&length, NULL, FALSE);
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}
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/* xx.x if length is fixed or constrained to be less than or equal to
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two bytes, then it will not be byte aligned. */
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byte_aligned=TRUE;
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if((min_len==max_len)&&(max_len<=2)){
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byte_aligned=FALSE;
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}
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if(max_len<2){
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byte_aligned=FALSE;
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}
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if(!length){
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/* there is no string at all, so dont do any byte alignment */
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byte_aligned=FALSE;
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}
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if(byte_aligned){
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if(offset&0x07){
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offset=(offset&0xfffffff8)+8;
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}
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}
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if(length>=1024){
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PER_NOT_DECODED_YET("restricted char string too long");
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length=1024;
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}
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/* 27.5.2 depending of the alphabet length, find how many bits
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are used to encode each character */
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/* unaligned PER
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if(alphabet_length<=2){
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bits_per_char=1;
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} else if(alphabet_length<=4){
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bits_per_char=2;
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} else if(alphabet_length<=8){
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bits_per_char=3;
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} else if(alphabet_length<=16){
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bits_per_char=4;
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} else if(alphabet_length<=32){
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bits_per_char=5;
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} else if(alphabet_length<=64){
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bits_per_char=6;
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} else if(alphabet_length<=128){
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bits_per_char=7;
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} else {
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bits_per_char=8;
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}
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*/
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if(alphabet_length<=2){
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bits_per_char=1;
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} else if(alphabet_length<=4){
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bits_per_char=2;
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} else if(alphabet_length<=16){
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bits_per_char=4;
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} else {
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bits_per_char=8;
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}
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old_offset=offset;
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for(char_pos=0;char_pos<length;char_pos++){
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guchar val;
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int i;
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gboolean bit;
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val=0;
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for(i=0;i<bits_per_char;i++){
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offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &bit, NULL);
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val=(val<<1)|bit;
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}
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if (val >= alphabet_length)
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str[char_pos] = '?'; /* XXX - how to mark this? */
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else
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str[char_pos]=alphabet[val];
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}
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str[char_pos]=0;
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proto_tree_add_string(tree, hf_index, tvb, (old_offset>>3), (offset>>3)-(old_offset>>3), str);
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return offset;
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}
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guint32
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dissect_per_NumericString(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, int min_len, int max_len)
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{
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offset=dissect_per_restricted_character_string(tvb, offset, pinfo, tree, hf_index, min_len, max_len, " 0123456789", 11);
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return offset;
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}
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guint32
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dissect_per_PrintableString(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, int min_len, int max_len)
|
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{
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offset=dissect_per_restricted_character_string(tvb, offset, pinfo, tree, hf_index, min_len, max_len, " '()+,-.*0123456789:=?ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 74);
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return offset;
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}
|
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guint32
|
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dissect_per_BMPString(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, int min_len, int max_len)
|
|
{
|
|
guint32 length;
|
|
static char *str;
|
|
|
|
/* xx.x if the length is 0 bytes there will be no encoding */
|
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if(max_len==0){
|
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return offset;
|
|
}
|
|
|
|
|
|
if(min_len==-1){
|
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min_len=0;
|
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}
|
|
|
|
|
|
/* xx.x */
|
|
length=max_len;
|
|
if(min_len!=max_len){
|
|
proto_tree *etr = NULL;
|
|
|
|
if(display_internal_per_fields){
|
|
etr=tree;
|
|
}
|
|
offset=dissect_per_constrained_integer(tvb, offset, pinfo,
|
|
etr, hf_per_octet_string_length, min_len, max_len,
|
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&length, NULL, FALSE);
|
|
}
|
|
|
|
|
|
/* align to byte boundary */
|
|
if(offset&0x07){
|
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offset=(offset&0xfffffff8)+8;
|
|
}
|
|
|
|
if(length>=1024){
|
|
PER_NOT_DECODED_YET("BMPString too long");
|
|
length=1024;
|
|
}
|
|
|
|
str = tvb_fake_unicode(tvb, offset>>3, length, FALSE);
|
|
|
|
proto_tree_add_string(tree, hf_index, tvb, offset>>3, length*2, str);
|
|
|
|
offset+=(length<<3)*2;
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
/* this function dissects a constrained sequence of */
|
|
guint32
|
|
dissect_per_constrained_sequence_of(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *parent_tree, int hf_index, gint ett_index, int (*func)(tvbuff_t *, int , packet_info *, proto_tree *), int min_len, int max_len)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *tree;
|
|
guint32 old_offset=offset;
|
|
guint32 length;
|
|
|
|
|
|
DEBUG_ENTRY("dissect_per_constrained_sequence_of");
|
|
item=proto_tree_add_item(parent_tree, hf_index, tvb, offset>>3, 0, FALSE);
|
|
tree=proto_item_add_subtree(item, ett_index);
|
|
|
|
/* 19.5 if min==max and min,max<64k ==> no length determinant */
|
|
if((min_len==max_len) && (min_len<65536)){
|
|
length=min_len;
|
|
goto call_sohelper;
|
|
}
|
|
|
|
/* 19.6 ub>=64k or unset */
|
|
if(max_len>=65536){
|
|
guint32 old_offset=offset;
|
|
/* semi-constrained whole number for number of elements */
|
|
/* each element encoded as 10.9 */
|
|
offset=dissect_per_length_determinant(tvb, offset, pinfo, tree, -1, &length);
|
|
length+=min_len;
|
|
proto_tree_add_uint(tree, hf_per_sequence_of_length, tvb, old_offset>>3, (offset>>3)!=(old_offset>>3)?(offset>>3)-(old_offset>>3):1, length);
|
|
goto call_sohelper;
|
|
}
|
|
|
|
/* constrained whole number for number of elements */
|
|
offset=dissect_per_constrained_integer(tvb, offset, pinfo,
|
|
tree, hf_per_sequence_of_length, min_len, max_len,
|
|
&length, NULL, FALSE);
|
|
|
|
|
|
|
|
call_sohelper:
|
|
offset=dissect_per_sequence_of_helper(tvb, offset, pinfo, tree, func, length);
|
|
|
|
|
|
proto_item_set_len(item, (offset>>3)!=(old_offset>>3)?(offset>>3)-(old_offset>>3):1);
|
|
return offset;
|
|
}
|
|
|
|
/* this function dissects a constrained set of */
|
|
guint32
|
|
dissect_per_constrained_set_of(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *parent_tree, int hf_index, gint ett_index, int (*func)(tvbuff_t *, int , packet_info *, proto_tree *), int min_len, int max_len)
|
|
{
|
|
/* for basic-per a set-of is encoded in the same way as a sequence-of */
|
|
DEBUG_ENTRY("dissect_per_constrained_set_of");
|
|
offset=dissect_per_constrained_sequence_of(tvb, offset, pinfo, parent_tree, hf_index, ett_index, func, min_len, max_len);
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* this function dissects a set of */
|
|
guint32
|
|
dissect_per_set_of(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *parent_tree, int hf_index, gint ett_index, int (*func)(tvbuff_t *, int , packet_info *, proto_tree *))
|
|
{
|
|
/* for basic-per a set-of is encoded in the same way as a sequence-of */
|
|
DEBUG_ENTRY("dissect_per_set_of");
|
|
offset=dissect_per_sequence_of(tvb, offset, pinfo, parent_tree, hf_index, ett_index, func);
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* this function reads a OBJECT IDENTIFIER */
|
|
guint32
|
|
dissect_per_object_identifier(tvbuff_t *tvb, guint32 offset, packet_info *pinfo _U_, proto_tree *tree, int hf_index, char *value_string)
|
|
{
|
|
int i,count;
|
|
char str[256],*strp;
|
|
guint8 byte;
|
|
guint32 value;
|
|
proto_tree *etr=NULL;
|
|
|
|
DEBUG_ENTRY("dissect_per_object_identifier");
|
|
|
|
if(display_internal_per_fields){
|
|
etr=tree;
|
|
}
|
|
|
|
/* first byte is the count and it is byte aligned */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
count=tvb_get_guint8(tvb, offset>>3);
|
|
|
|
|
|
proto_tree_add_uint(etr, hf_per_object_identifier_length, tvb, offset>>3, 1, count);
|
|
offset+=8;
|
|
|
|
value=0;
|
|
for(i=0,strp=str;i<count;i++){
|
|
byte=tvb_get_guint8(tvb,offset>>3);
|
|
offset+=8;
|
|
|
|
if((strp-str)>200){
|
|
PER_NOT_DECODED_YET("too long octet_string");
|
|
/*XXX assert here */
|
|
return offset;
|
|
}
|
|
|
|
if(i==0){
|
|
/* the first byte contains the first two object identifier components */
|
|
if(byte<40){
|
|
strp+=sprintf(strp,"0.%d",byte);
|
|
} else if (byte<80){
|
|
strp+=sprintf(strp,"1.%d",byte-40);
|
|
} else {
|
|
strp+=sprintf(strp,"2.%d",byte-80);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
value=(value<<7)|(byte&0x7f);
|
|
if(byte&0x80){
|
|
continue;
|
|
}
|
|
|
|
strp+=sprintf(strp,".%d",value);
|
|
value=0;
|
|
}
|
|
*strp=0;
|
|
|
|
proto_tree_add_string(tree, hf_index, tvb, (offset>>3)-count, count, str);
|
|
|
|
if (value_string) {
|
|
strcpy(value_string, str);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* this function reads a single bit */
|
|
guint32
|
|
dissect_per_boolean(tvbuff_t *tvb, guint32 offset, packet_info *pinfo _U_, proto_tree *tree, int hf_index, gboolean *bool, proto_item **item)
|
|
{
|
|
guint8 ch, mask;
|
|
gboolean value;
|
|
header_field_info *hfi;
|
|
proto_item *it;
|
|
|
|
DEBUG_ENTRY("dissect_per_boolean");
|
|
|
|
ch=tvb_get_guint8(tvb, offset>>3);
|
|
mask=1<<(7-(offset&0x07));
|
|
if(ch&mask){
|
|
value=1;
|
|
} else {
|
|
value=0;
|
|
}
|
|
if(hf_index!=-1){
|
|
char str[256];
|
|
hfi = proto_registrar_get_nth(hf_index);
|
|
sprintf(str,"%s: %c%c%c%c %c%c%c%c %s",
|
|
hfi->name,
|
|
mask&0x80?'0'+value:'.',
|
|
mask&0x40?'0'+value:'.',
|
|
mask&0x20?'0'+value:'.',
|
|
mask&0x10?'0'+value:'.',
|
|
mask&0x08?'0'+value:'.',
|
|
mask&0x04?'0'+value:'.',
|
|
mask&0x02?'0'+value:'.',
|
|
mask&0x01?'0'+value:'.',
|
|
value?"True":"False"
|
|
);
|
|
it=proto_tree_add_boolean_format(tree, hf_index, tvb, offset>>3, 1, value, str);
|
|
if(item){
|
|
*item=it;
|
|
}
|
|
}
|
|
|
|
if(bool){
|
|
*bool=value;
|
|
}
|
|
return offset+1;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* we currently only handle integers up to 32 bits in length. */
|
|
guint32
|
|
dissect_per_integer(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, gint32 *value, proto_item **item)
|
|
{
|
|
guint32 i, length;
|
|
gint32 val;
|
|
proto_item *it=NULL;
|
|
|
|
/* 12.2.6 b */
|
|
offset=dissect_per_length_determinant(tvb, offset, pinfo, tree, -1, &length);
|
|
/* gassert here? */
|
|
if(length>4){
|
|
PER_NOT_DECODED_YET("too long integer");
|
|
length=4;
|
|
}
|
|
|
|
val=0;
|
|
for(i=0;i<length;i++){
|
|
if(i==0){
|
|
if(tvb_get_guint8(tvb, offset>>3)&0x80){
|
|
/* negative number */
|
|
val=0xffffffff;
|
|
} else {
|
|
/* positive number */
|
|
val=0;
|
|
}
|
|
}
|
|
val=(val<<8)|tvb_get_guint8(tvb,offset>>3);
|
|
offset+=8;
|
|
}
|
|
it=proto_tree_add_int(tree, hf_index, tvb, (offset>>3)-(length+1), length+1, val);
|
|
|
|
if(item){
|
|
*item=it;
|
|
}
|
|
if(value){
|
|
*value=val;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
/* this function reads a constrained integer with or without a
|
|
PER visible extension marker present
|
|
|
|
has_extension==TRUE would map to asn constructs such as:
|
|
rfc-number INTEGER (1..32768, ...)
|
|
while has_extension==FALSE would map to:
|
|
t35CountryCode INTEGER (0..255)
|
|
|
|
it only handles integers that fit inside a 32 bit integer
|
|
10.5.1 info only
|
|
10.5.2 info only
|
|
10.5.3 range=ub-lb+1
|
|
10.5.4 empty range
|
|
10.5.5 info only
|
|
10.5.6 unaligned version
|
|
10.5.7 aligned version
|
|
10.5.7.1 decoding of 0-255 1-8 bits
|
|
10.5.7.2 decoding og 0-256 8 bits
|
|
10.5.7.3 decoding of 0-65535 16 bits
|
|
10.5.7.4
|
|
*/
|
|
guint32
|
|
dissect_per_constrained_integer(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, guint32 min, guint32 max, guint32 *value, proto_item **item, gboolean has_extension)
|
|
{
|
|
proto_item *it=NULL;
|
|
guint32 range, val;
|
|
gint val_start, val_length;
|
|
nstime_t timeval;
|
|
header_field_info *hfi;
|
|
int num_bits;
|
|
int pad;
|
|
guint32 tmp;
|
|
|
|
DEBUG_ENTRY("dissect_per_constrained_integer");
|
|
if(has_extension){
|
|
gboolean extension_present;
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &extension_present, NULL);
|
|
if(extension_present){
|
|
offset=dissect_per_integer(tvb, offset, pinfo, tree,
|
|
hf_index,
|
|
NULL, NULL);
|
|
return offset;
|
|
}
|
|
}
|
|
|
|
hfi = proto_registrar_get_nth(hf_index);
|
|
|
|
/* 10.5.3 */
|
|
if((max-min)>65536){
|
|
/* just set range really big so it will fall through
|
|
to the bottom of the encoding */
|
|
range=1000000;
|
|
} else {
|
|
range=max-min+1;
|
|
}
|
|
|
|
num_bits=0;
|
|
pad=0;
|
|
val=0;
|
|
timeval.secs=val; timeval.nsecs=0;
|
|
/* 10.5.4 */
|
|
if(range==1){
|
|
val_start = offset>>3; val_length = 0;
|
|
val = min;
|
|
} else if(range<=255) {
|
|
/* 10.5.7.1 */
|
|
char str[256];
|
|
int i, bit, length;
|
|
|
|
length=1;
|
|
if(range<=2){
|
|
num_bits=1;
|
|
} else if(range<=4){
|
|
num_bits=2;
|
|
} else if(range<=8){
|
|
num_bits=3;
|
|
} else if(range<=16){
|
|
num_bits=4;
|
|
} else if(range<=32){
|
|
num_bits=5;
|
|
} else if(range<=64){
|
|
num_bits=6;
|
|
} else if(range<=128){
|
|
num_bits=7;
|
|
} else if(range<=256){
|
|
num_bits=8;
|
|
}
|
|
/* prepare the string */
|
|
sprintf(str, "%s: ", hfi->name);
|
|
for(bit=0;bit<((int)(offset&0x07));bit++){
|
|
if(bit&&(!(bit%4))){
|
|
strcat(str, " ");
|
|
}
|
|
strcat(str,".");
|
|
}
|
|
/* read the bits for the int */
|
|
for(i=0;i<num_bits;i++){
|
|
if(bit&&(!(bit%4))){
|
|
strcat(str, " ");
|
|
}
|
|
if(bit&&(!(bit%8))){
|
|
length+=1;
|
|
strcat(str, " ");
|
|
}
|
|
bit++;
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &tmp, NULL);
|
|
val<<=1;
|
|
if(tmp){
|
|
val|=tmp;
|
|
strcat(str, "1");
|
|
} else {
|
|
strcat(str, "0");
|
|
}
|
|
}
|
|
for(;bit%8;bit++){
|
|
if(bit&&(!(bit%4))){
|
|
strcat(str, " ");
|
|
}
|
|
strcat(str,".");
|
|
}
|
|
val_start = (offset-num_bits)>>3; val_length = length;
|
|
val+=min;
|
|
} else if(range==256){
|
|
/* 10.5.7.2 */
|
|
num_bits=8;
|
|
pad=7-(offset&0x07);
|
|
|
|
/* in the aligned case, align to byte boundary */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
val=tvb_get_guint8(tvb, offset>>3);
|
|
offset+=8;
|
|
|
|
val_start = (offset>>3)-1; val_length = 1;
|
|
val+=min;
|
|
} else if(range<=65536){
|
|
/* 10.5.7.3 */
|
|
num_bits=16;
|
|
pad=7-(offset&0x07);
|
|
|
|
/* in the aligned case, align to byte boundary */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
val=tvb_get_guint8(tvb, offset>>3);
|
|
val<<=8;
|
|
offset+=8;
|
|
val|=tvb_get_guint8(tvb, offset>>3);
|
|
offset+=8;
|
|
|
|
val_start = (offset>>3)-2; val_length = 2;
|
|
val+=min;
|
|
} else {
|
|
int i,num_bytes;
|
|
gboolean bit;
|
|
|
|
/* 10.5.7.4 */
|
|
/* 12.2.6 */
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &bit, NULL);
|
|
num_bytes=bit;
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &bit, NULL);
|
|
num_bytes=(num_bytes<<1)|bit;
|
|
|
|
num_bytes++; /* lower bound for length determinant is 1 */
|
|
|
|
/* byte aligned */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
val=0;
|
|
for(i=0;i<num_bytes;i++){
|
|
val=(val<<8)|tvb_get_guint8(tvb,offset>>3);
|
|
offset+=8;
|
|
}
|
|
val_start = (offset>>3)-(num_bytes+1); val_length = num_bytes+1;
|
|
val+=min;
|
|
}
|
|
|
|
timeval.secs = val;
|
|
if (IS_FT_UINT(hfi->type)) {
|
|
it = proto_tree_add_uint(tree, hf_index, tvb, val_start, val_length, val);
|
|
} else if (IS_FT_INT(hfi->type)) {
|
|
it = proto_tree_add_int(tree, hf_index, tvb, val_start, val_length, val);
|
|
} else if (IS_FT_TIME(hfi->type)) {
|
|
it = proto_tree_add_time(tree, hf_index, tvb, val_start, val_length, &timeval);
|
|
} else {
|
|
g_assert_not_reached();
|
|
}
|
|
if (item) *item = it;
|
|
if (value) *value = val;
|
|
return offset;}
|
|
|
|
/* this functions decodes a CHOICE
|
|
it can only handle CHOICE INDEX values that fits inside a 32 bit integer.
|
|
22.1
|
|
22.2
|
|
22.3
|
|
22.4
|
|
22.5
|
|
22.6 no extensions
|
|
22.7 extension marker == 0
|
|
22.8 extension marker == 1
|
|
*/
|
|
guint32
|
|
dissect_per_choice(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, gint ett_index, per_choice_t *choice, char *name, guint32 *value)
|
|
{
|
|
gboolean extension_present, extension_flag;
|
|
int extension_root_entries;
|
|
guint32 choice_index;
|
|
int i;
|
|
proto_item *it=NULL;
|
|
proto_tree *tr=NULL;
|
|
guint32 old_offset=offset;
|
|
int min_choice=INT_MAX;
|
|
int max_choice=-1;
|
|
|
|
DEBUG_ENTRY("dissect_per_choice");
|
|
|
|
it=proto_tree_add_text(tree, tvb, offset>>3, 0, name);
|
|
tr=proto_item_add_subtree(it, ett_index);
|
|
|
|
|
|
/* first check if there should be an extension bit for this CHOICE.
|
|
we do this by just checking the first choice arm
|
|
*/
|
|
if(choice[0].extension==ASN1_NO_EXTENSIONS){
|
|
extension_present=0;
|
|
} else {
|
|
proto_tree *etr=NULL;
|
|
|
|
if(display_internal_per_fields){
|
|
etr=tr;
|
|
}
|
|
extension_present=1;
|
|
/* will be placed called again below to place it in the tree */
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, etr, hf_per_extension_bit, &extension_flag, NULL);
|
|
}
|
|
|
|
/* count the number of entries in the extension_root */
|
|
extension_root_entries=0;
|
|
for(i=0;choice[i].name;i++){
|
|
switch(choice[i].extension){
|
|
case ASN1_NO_EXTENSIONS:
|
|
case ASN1_EXTENSION_ROOT:
|
|
if(choice[i].value<min_choice){
|
|
min_choice=choice[i].value;
|
|
}
|
|
if(choice[i].value>max_choice){
|
|
max_choice=choice[i].value;
|
|
}
|
|
extension_root_entries++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( (!extension_present)
|
|
|| (extension_present && (extension_flag==0)) ){
|
|
guint32 choice_offset=offset;
|
|
proto_tree *choicetree;
|
|
proto_item *choiceitem;
|
|
proto_tree *etr=NULL;
|
|
|
|
/* 22.6 */
|
|
/* 22.7 */
|
|
/*qqq make it similar to the section below instead */
|
|
offset=dissect_per_constrained_integer(tvb, offset, pinfo,
|
|
tr, hf_index, min_choice, max_choice,
|
|
&choice_index, &choiceitem, FALSE);
|
|
if(value){
|
|
*value=choice_index;
|
|
}
|
|
|
|
choicetree=proto_item_add_subtree(choiceitem, ett_index);
|
|
|
|
if(display_internal_per_fields){
|
|
etr=choicetree;
|
|
}
|
|
|
|
/* find and call the appropriate callback */
|
|
for(i=0;choice[i].name;i++){
|
|
if(choice[i].value==(int)choice_index){
|
|
if(choice[i].func){
|
|
offset=choice[i].func(tvb, offset, pinfo, choicetree);
|
|
break;
|
|
} else {
|
|
PER_NOT_DECODED_YET(choice[i].name);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
proto_item_set_len(choiceitem, (offset>>3)!=(choice_offset>>3)?(offset>>3)-(choice_offset>>3):1);
|
|
} else {
|
|
guint32 length;
|
|
int i, index;
|
|
guint32 choice_offset;
|
|
proto_tree *choicetree;
|
|
proto_item *choiceitem;
|
|
proto_tree *etr=NULL;
|
|
|
|
if(display_internal_per_fields){
|
|
etr=tr;
|
|
}
|
|
|
|
/* 22.8 */
|
|
offset=dissect_per_normally_small_nonnegative_whole_number(tvb, offset, pinfo, etr, hf_per_choice_extension, &choice_index);
|
|
offset=dissect_per_length_determinant(tvb, offset, pinfo, etr, hf_per_open_type_length, &length);
|
|
|
|
|
|
choice_offset=offset;
|
|
choiceitem=proto_tree_add_text(tr, tvb, offset>>3, 0, "Choice");
|
|
choicetree=proto_item_add_subtree(choiceitem, ett_index);
|
|
|
|
index=-1;
|
|
for(i=0;choice[i].name;i++){
|
|
if(choice[i].extension==ASN1_NOT_EXTENSION_ROOT){
|
|
if(!choice_index){
|
|
index=i;
|
|
break;
|
|
}
|
|
choice_index--;
|
|
}
|
|
}
|
|
|
|
if(index!=-1){
|
|
if(value){
|
|
*value=index;
|
|
}
|
|
}
|
|
|
|
if(index==-1){
|
|
/* if we dont know how to decode this one, just step offset to the next structure */
|
|
offset+=length*8;
|
|
PER_NOT_DECODED_YET("unknown choice extension");
|
|
} else {
|
|
guint32 new_offset;
|
|
|
|
proto_item_set_text(choiceitem, choice[index].name);
|
|
new_offset=choice[index].func(tvb, offset, pinfo, choicetree);
|
|
|
|
if((new_offset>(offset+(length*8)))||((new_offset+8)<(offset+length*8))){
|
|
printf("new_offset:%d offset:%d length*8:%d\n",new_offset,offset,length*8);
|
|
/* g_assert_not_reached();*/
|
|
}
|
|
|
|
offset+=length*8;
|
|
}
|
|
proto_item_set_len(choiceitem, (offset>>3)!=(choice_offset>>3)?(offset>>3)-(choice_offset>>3):1);
|
|
}
|
|
|
|
proto_item_set_len(it, (offset>>3)!=(old_offset>>3)?(offset>>3)-(old_offset>>3):1);
|
|
return offset;
|
|
}
|
|
|
|
|
|
static char *
|
|
index_get_optional_name(per_sequence_t *sequence, int index)
|
|
{
|
|
int i;
|
|
|
|
for(i=0;sequence[i].name;i++){
|
|
if((sequence[i].extension!=ASN1_NOT_EXTENSION_ROOT)&&(sequence[i].optional==ASN1_OPTIONAL)){
|
|
if(index==0){
|
|
return sequence[i].name;
|
|
}
|
|
index--;
|
|
}
|
|
}
|
|
return "<unknown type>";
|
|
}
|
|
|
|
static char *
|
|
index_get_extension_name(per_sequence_t *sequence, int index)
|
|
{
|
|
int i;
|
|
|
|
for(i=0;sequence[i].name;i++){
|
|
if(sequence[i].extension==ASN1_NOT_EXTENSION_ROOT){
|
|
if(index==0){
|
|
return sequence[i].name;
|
|
}
|
|
index--;
|
|
}
|
|
}
|
|
return "<unknown type>";
|
|
}
|
|
|
|
/* this functions decodes a SEQUENCE
|
|
it can only handle SEQUENCES with at most 32 DEFAULT or OPTIONAL fields
|
|
18.1 extension bit
|
|
18.2 optinal/default items in root
|
|
18.3 we ignore the case where n>64K
|
|
18.4 the root sequence
|
|
18.5
|
|
18.6
|
|
18.7
|
|
18.8
|
|
18.9
|
|
*/
|
|
guint32
|
|
dissect_per_sequence(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *parent_tree, int hf_index, gint ett_index, per_sequence_t *sequence)
|
|
{
|
|
gboolean extension_present, extension_flag, optional_field_flag;
|
|
proto_item *item;
|
|
proto_tree *tree;
|
|
guint32 old_offset=offset;
|
|
guint32 i, num_opts;
|
|
guint32 optional_mask;
|
|
|
|
|
|
DEBUG_ENTRY("dissect_per_sequence");
|
|
|
|
item=proto_tree_add_item(parent_tree, hf_index, tvb, offset>>3, 0, FALSE);
|
|
tree=proto_item_add_subtree(item, ett_index);
|
|
|
|
|
|
/* first check if there should be an extension bit for this CHOICE.
|
|
we do this by just checking the first choice arm
|
|
*/
|
|
/* 18.1 */
|
|
extension_flag=0;
|
|
if(sequence[0].extension==ASN1_NO_EXTENSIONS){
|
|
extension_present=0;
|
|
} else {
|
|
proto_tree *etr=NULL;
|
|
|
|
if(display_internal_per_fields){
|
|
etr=tree;
|
|
}
|
|
extension_present=1;
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, etr, hf_per_extension_bit, &extension_flag, NULL);
|
|
}
|
|
/* 18.2 */
|
|
num_opts=0;
|
|
for(i=0;sequence[i].name;i++){
|
|
if((sequence[i].extension!=ASN1_NOT_EXTENSION_ROOT)&&(sequence[i].optional==ASN1_OPTIONAL)){
|
|
num_opts++;
|
|
}
|
|
}
|
|
|
|
optional_mask=0;
|
|
for(i=0;i<num_opts;i++){
|
|
proto_item *it=NULL;
|
|
proto_tree *etr=NULL;
|
|
if(display_internal_per_fields){
|
|
etr=tree;
|
|
}
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, etr, hf_per_optional_field_bit, &optional_field_flag, &it);
|
|
optional_mask<<=1;
|
|
if(optional_field_flag){
|
|
optional_mask|=0x01;
|
|
}
|
|
if(it){
|
|
proto_item_append_text(it, " (%s %s present)",
|
|
index_get_optional_name(sequence, i),
|
|
optional_field_flag?"is":"is NOT"
|
|
);
|
|
}
|
|
}
|
|
|
|
|
|
/* 18.4 */
|
|
for(i=0;sequence[i].name;i++){
|
|
if( (sequence[i].extension==ASN1_NO_EXTENSIONS)
|
|
|| (sequence[i].extension==ASN1_EXTENSION_ROOT) ){
|
|
if(sequence[i].optional==ASN1_OPTIONAL){
|
|
gboolean is_present;
|
|
is_present=(1<<(num_opts-1))&optional_mask;
|
|
num_opts--;
|
|
if(!is_present){
|
|
continue;
|
|
}
|
|
}
|
|
if(sequence[i].func){
|
|
offset=sequence[i].func(tvb, offset, pinfo, tree);
|
|
} else {
|
|
PER_NOT_DECODED_YET(sequence[i].name);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
if(extension_flag){
|
|
gboolean extension_bit;
|
|
guint32 num_known_extensions;
|
|
guint32 num_extensions;
|
|
guint32 extension_mask;
|
|
proto_tree *etr=NULL;
|
|
proto_item *it=NULL;
|
|
|
|
if(display_internal_per_fields){
|
|
etr=tree;
|
|
}
|
|
|
|
offset=dissect_per_normally_small_nonnegative_whole_number(tvb, offset, pinfo, etr, hf_per_num_sequence_extensions, &num_extensions);
|
|
/* the X.691 standard is VERY unclear here.
|
|
there is no mention that the lower bound lb for this
|
|
(apparently) semiconstrained value is 1,
|
|
apart from the NOTE: comment in 18.8 that this value can
|
|
not be 0.
|
|
In my book, there is a semantic difference between having
|
|
a comment that says that the value can not be zero
|
|
and stating that the lb is 1.
|
|
I dont know if this is right or not but it makes
|
|
some of the very few captures I have decode properly.
|
|
|
|
It could also be that the captures I have are generated by
|
|
a broken implementation.
|
|
If this is wrong and you dont report it as a bug
|
|
then it wont get fixed!
|
|
*/
|
|
num_extensions+=1;
|
|
|
|
extension_mask=0;
|
|
for(i=0;i<num_extensions;i++){
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, etr, hf_per_extension_present_bit, &extension_bit, &it);
|
|
extension_mask=(extension_mask<<1)|extension_bit;
|
|
if(it){
|
|
proto_item_append_text(it, " (%s %s present)",
|
|
index_get_extension_name(sequence, i),
|
|
extension_bit?"is":"is NOT"
|
|
);
|
|
}
|
|
|
|
}
|
|
|
|
/* find how many extensions we know about */
|
|
num_known_extensions=0;
|
|
for(i=0;sequence[i].name;i++){
|
|
if(sequence[i].extension==ASN1_NOT_EXTENSION_ROOT){
|
|
num_known_extensions++;
|
|
}
|
|
}
|
|
|
|
/* decode the extensions one by one */
|
|
for(i=0;i<num_extensions;i++){
|
|
guint32 length;
|
|
guint32 new_offset;
|
|
guint32 extension_index;
|
|
guint32 j,k;
|
|
|
|
if(!((1L<<(num_extensions-1-i))&extension_mask)){
|
|
/* this extension is not encoded in this PDU */
|
|
continue;
|
|
}
|
|
|
|
offset=dissect_per_length_determinant(tvb, offset, pinfo, etr, hf_per_open_type_length, &length);
|
|
|
|
if(i>=num_known_extensions){
|
|
/* we dont know how to decode this extension */
|
|
offset+=length*8;
|
|
PER_NOT_DECODED_YET("unknown sequence extension");
|
|
continue;
|
|
}
|
|
|
|
extension_index=0;
|
|
for(j=0,k=0;sequence[j].name;j++){
|
|
if(sequence[j].extension==ASN1_NOT_EXTENSION_ROOT){
|
|
if(k==i){
|
|
extension_index=j;
|
|
break;
|
|
}
|
|
k++;
|
|
}
|
|
}
|
|
|
|
if(sequence[extension_index].func){
|
|
new_offset=sequence[extension_index].func(tvb, offset, pinfo, tree);
|
|
} else {
|
|
PER_NOT_DECODED_YET(sequence[extension_index].name);
|
|
}
|
|
offset+=length*8;
|
|
|
|
}
|
|
}
|
|
|
|
|
|
proto_item_set_len(item, (offset>>3)!=(old_offset>>3)?(offset>>3)-(old_offset>>3):1);
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
/* 15 Encoding the bitstring type
|
|
|
|
max_len or min_len == -1 means there is no lower/upper constraint
|
|
|
|
*/
|
|
guint32
|
|
dissect_per_bit_string(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, int min_len, int max_len)
|
|
{
|
|
guint32 length;
|
|
header_field_info *hfi;
|
|
|
|
hfi = (hf_index==-1) ? NULL : proto_registrar_get_nth(hf_index);
|
|
|
|
DEBUG_ENTRY("dissect_per_bit_string");
|
|
/* 15.8 if the length is 0 bytes there will be no encoding */
|
|
if(max_len==0) {
|
|
return offset;
|
|
}
|
|
|
|
if(min_len==-1) {
|
|
min_len=0;
|
|
}
|
|
|
|
/* 15.9 if length is fixed and less than or equal to sixteen bits*/
|
|
if((min_len==max_len)&&(max_len<=16)){
|
|
static char bytes[4];
|
|
int i;
|
|
guint32 old_offset=offset;
|
|
gboolean bit;
|
|
|
|
bytes[0]=bytes[1]=bytes[2]=0;
|
|
for(i=0;i<min_len;i++){
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &bit, NULL);
|
|
bytes[0]=(bytes[0]<<1)|bit;
|
|
}
|
|
if(min_len>8){
|
|
for(i=8;i<min_len;i++){
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &bit, NULL);
|
|
bytes[1]=(bytes[1]<<1)|bit;
|
|
}
|
|
if(min_len<16){
|
|
bytes[1]|=bytes[0]<<(min_len-8);
|
|
bytes[0]>>=16-min_len;
|
|
}
|
|
}
|
|
if (hfi) {
|
|
proto_tree_add_bytes(tree, hf_index, tvb, old_offset>>3, (min_len+7)/8+(offset&0x07)?1:0, bytes);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
|
|
/* 15.10 if length is fixed and less than to 64kbits*/
|
|
if((min_len==max_len)&&(min_len<65536)){
|
|
/* align to byte */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
if (hfi) {
|
|
proto_tree_add_item(tree, hf_index, tvb, offset>>3, (min_len+7)/8, FALSE);
|
|
}
|
|
offset+=min_len;
|
|
return offset;
|
|
}
|
|
|
|
/* 15.11 */
|
|
if(max_len>0){
|
|
proto_tree *etr = NULL;
|
|
|
|
if(display_internal_per_fields){
|
|
etr=tree;
|
|
}
|
|
offset=dissect_per_constrained_integer(tvb, offset, pinfo,
|
|
etr, hf_per_bit_string_length, min_len, max_len,
|
|
&length, NULL, FALSE);
|
|
} else {
|
|
offset=dissect_per_length_determinant(tvb, offset, pinfo, tree, hf_per_bit_string_length, &length);
|
|
}
|
|
if(length){
|
|
/* align to byte */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
if (hfi) {
|
|
proto_tree_add_item(tree, hf_index, tvb, offset>>3, (length+7)/8, FALSE);
|
|
}
|
|
}
|
|
offset+=length;
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
/* this fucntion dissects an OCTET STRING
|
|
16.1
|
|
16.2
|
|
16.3
|
|
16.4
|
|
16.5
|
|
16.6
|
|
16.7
|
|
16.8
|
|
|
|
max_len or min_len == -1 means there is no lower/upper constraint
|
|
|
|
hf_index can either be a FT_BYTES or an FT_STRING
|
|
*/
|
|
guint32
|
|
dissect_per_octet_string(tvbuff_t *tvb, guint32 offset, packet_info *pinfo, proto_tree *tree, int hf_index, int min_len, int max_len, guint32 *value_offset, guint32 *value_len)
|
|
{
|
|
proto_tree *etr = NULL;
|
|
proto_item *it = NULL;
|
|
gint val_start, val_length;
|
|
guint32 length;
|
|
header_field_info *hfi;
|
|
static char bytes[4];
|
|
char *pbytes = NULL;
|
|
|
|
hfi = (hf_index==-1) ? NULL : proto_registrar_get_nth(hf_index);
|
|
if (display_internal_per_fields) {
|
|
etr = tree;
|
|
}
|
|
|
|
DEBUG_ENTRY("dissect_per_octet_string");
|
|
|
|
if(min_len==-1){
|
|
min_len=0;
|
|
}
|
|
|
|
if (max_len==0) { /* 16.5 if the length is 0 bytes there will be no encoding */
|
|
val_start = offset>>3;
|
|
val_length = 0;
|
|
|
|
} else if((min_len==max_len)&&(max_len<=2)) { /* 16.6 if length is fixed and less than or equal to two bytes*/
|
|
guint32 i, old_offset=offset;
|
|
gboolean bit;
|
|
|
|
for(i=0;i<8;i++){
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &bit, NULL);
|
|
bytes[0]=(bytes[0]<<1)|bit;
|
|
}
|
|
if(min_len==2){
|
|
for(i=0;i<8;i++){
|
|
offset=dissect_per_boolean(tvb, offset, pinfo, tree, -1, &bit, NULL);
|
|
bytes[1]=(bytes[1]<<1)|bit;
|
|
}
|
|
}
|
|
bytes[min_len]=0;
|
|
pbytes = bytes;
|
|
val_start = old_offset>>3;
|
|
val_length = min_len+(offset&0x07)?1:0;
|
|
|
|
} else if ((min_len==max_len)&&(min_len<65536)) { /* 16.7 if length is fixed and less than to 64k*/
|
|
/* align to byte */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
val_start = offset>>3;
|
|
val_length = min_len;
|
|
offset+=min_len*8;
|
|
|
|
} else { /* 16.8 */
|
|
if(max_len>0) {
|
|
offset = dissect_per_constrained_integer(tvb, offset, pinfo, etr,
|
|
hf_per_octet_string_length, min_len, max_len,
|
|
&length, NULL, FALSE);
|
|
} else {
|
|
offset = dissect_per_length_determinant(tvb, offset, pinfo, etr,
|
|
hf_per_octet_string_length, &length);
|
|
}
|
|
|
|
if(length){
|
|
/* align to byte */
|
|
if(offset&0x07){
|
|
offset=(offset&0xfffffff8)+8;
|
|
}
|
|
}
|
|
val_start = offset>>3;
|
|
val_length = length;
|
|
offset+=length*8;
|
|
}
|
|
|
|
if (hfi) {
|
|
if (IS_FT_UINT(hfi->type)||IS_FT_INT(hfi->type)) {
|
|
if (IS_FT_UINT(hfi->type))
|
|
it = proto_tree_add_uint(tree, hf_index, tvb, val_start, val_length, val_length);
|
|
else
|
|
it = proto_tree_add_int(tree, hf_index, tvb, val_start, val_length, val_length);
|
|
proto_item_append_text(it, (val_length == 1) ? " octet" : " octets");
|
|
} else {
|
|
if (pbytes) {
|
|
if(IS_FT_STRING(hfi->type)){
|
|
proto_tree_add_string(tree, hf_index, tvb, val_start, val_length, pbytes);
|
|
} else if (hfi->type==FT_BYTES) {
|
|
proto_tree_add_bytes(tree, hf_index, tvb, val_start, val_length, pbytes);
|
|
} else {
|
|
g_assert_not_reached();
|
|
}
|
|
} else {
|
|
proto_tree_add_item(tree, hf_index, tvb, val_start, val_length, FALSE);
|
|
}
|
|
}
|
|
}
|
|
if (value_offset) *value_offset = val_start;
|
|
if (value_len) *value_len = val_length;
|
|
return offset;
|
|
}
|
|
|
|
|
|
|
|
void
|
|
proto_register_per(void)
|
|
{
|
|
static hf_register_info hf[] =
|
|
{
|
|
{ &hf_per_num_sequence_extensions,
|
|
{ "Number of Sequence Extensions", "per.num_sequence_extensions", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Number of extensions encoded in this sequence", HFILL }},
|
|
{ &hf_per_choice_extension,
|
|
{ "Choice Extension", "per.choice_extension", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Which extension of the Choice is encoded", HFILL }},
|
|
{ &hf_per_GeneralString_length,
|
|
{ "GeneralString Length", "per.generalstring_length", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Length of the GeneralString", HFILL }},
|
|
{ &hf_per_extension_bit,
|
|
{ "Extension Bit", "per.extension_bit", FT_BOOLEAN, 8,
|
|
TFS(&tfs_extension_bit), 0x01, "The extension bit of an aggregate", HFILL }},
|
|
{ &hf_per_extension_present_bit,
|
|
{ "Extension Present Bit", "per.extension_present_bit", FT_BOOLEAN, 8,
|
|
TFS(&tfs_extension_present_bit), 0x01, "Whether this optional extension is present or not", HFILL }},
|
|
{ &hf_per_small_number_bit,
|
|
{ "Small Number Bit", "per.small_number_bit", FT_BOOLEAN, 8,
|
|
TFS(&tfs_small_number_bit), 0x01, "The small number bit for a section 10.6 integer", HFILL }},
|
|
{ &hf_per_optional_field_bit,
|
|
{ "Optional Field Bit", "per.optional_field_bit", FT_BOOLEAN, 8,
|
|
TFS(&tfs_optional_field_bit), 0x01, "This bit specifies the presence/absence of an optional field", HFILL }},
|
|
{ &hf_per_sequence_of_length,
|
|
{ "Sequence-Of Length", "per.sequence_of_length", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Number of items in the Sequence Of", HFILL }},
|
|
{ &hf_per_object_identifier_length,
|
|
{ "Object Length", "per.object_length", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Length of the object identifier", HFILL }},
|
|
{ &hf_per_open_type_length,
|
|
{ "Open Type Length", "per.open_type_length", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Length of an open type encoding", HFILL }},
|
|
{ &hf_per_octet_string_length,
|
|
{ "Octet String Length", "per.octet_string_length", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Number of bytes in the Octet String", HFILL }},
|
|
{ &hf_per_bit_string_length,
|
|
{ "Bit String Length", "per.bit_string_length", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Number of bits in the Bit String", HFILL }},
|
|
};
|
|
|
|
static gint *ett[] =
|
|
{
|
|
&ett_per_sequence_of_item
|
|
};
|
|
module_t *per_module;
|
|
|
|
proto_per = proto_register_protocol("Packed Encoding Rules (ASN.1 X.691)", "PER", "per");
|
|
proto_register_field_array(proto_per, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
proto_set_cant_toggle(proto_per);
|
|
|
|
per_module = prefs_register_protocol(proto_per, NULL);
|
|
prefs_register_bool_preference(per_module, "display_internal_per_fields",
|
|
"Display the internal PER fields in the tree",
|
|
"Whether the dissector should put the internal PER data in the tree or if it should hide it",
|
|
&display_internal_per_fields);
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_per(void)
|
|
{
|
|
}
|
|
|