96c217f2dc
svn path=/trunk/; revision=7194
789 lines
19 KiB
C
789 lines
19 KiB
C
/* packet-dcerpc-nt.c
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* Routines for DCERPC over SMB packet disassembly
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* Copyright 2001-2003, Tim Potter <tpot@samba.org>
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*
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* $Id: packet-dcerpc-nt.c,v 1.69 2003/02/25 02:04:56 tpot Exp $
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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 "packet-dcerpc.h"
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#include "packet-dcerpc-nt.h"
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#include "smb.h"
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#include "packet-smb-common.h" /* for dissect_smb_64bit_time() */
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/*
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* This file contains helper routines that are used by the DCERPC over SMB
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* dissectors for ethereal.
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*/
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/* Parse some common RPC structures */
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gint ett_nt_unicode_string = -1; /* FIXME: make static */
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/* Dissect a counted string as a callback to dissect_ndr_pointer_cb() */
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static int hf_nt_cs_len = -1;
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static int hf_nt_cs_size = -1;
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int
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dissect_ndr_counted_string_cb(tvbuff_t *tvb, int offset,
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packet_info *pinfo, proto_tree *tree,
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char *drep, int hf_index,
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dcerpc_callback_fnct_t *callback,
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void *callback_args)
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{
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dcerpc_info *di = pinfo->private_data;
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guint16 len, size;
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/* Structure starts with short, but is aligned for longs */
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ALIGN_TO_4_BYTES;
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if (di->conformant_run)
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return offset;
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/*
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struct {
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short len;
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short size;
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[size_is(size/2), length_is(len/2), ptr] unsigned short *string;
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} UNICODE_STRING;
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*/
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offset = dissect_ndr_uint16(tvb, offset, pinfo, tree, drep,
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hf_nt_cs_len, &len);
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offset = dissect_ndr_uint16(tvb, offset, pinfo, tree, drep,
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hf_nt_cs_size, &size);
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offset = dissect_ndr_pointer_cb(tvb, offset, pinfo, tree, drep,
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dissect_ndr_wchar_cvstring, NDR_POINTER_UNIQUE,
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"Character Array", hf_index, callback, callback_args);
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return offset;
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}
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static gint ett_nt_counted_string = -1;
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static int
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dissect_ndr_counted_string_helper(tvbuff_t *tvb, int offset,
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packet_info *pinfo, proto_tree *tree,
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char *drep, int hf_index, int levels,
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gboolean add_subtree)
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{
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proto_item *item;
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proto_tree *subtree = tree;
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if (add_subtree) {
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item = proto_tree_add_text(
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tree, tvb, offset, 0,
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proto_registrar_get_name(hf_index));
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subtree = proto_item_add_subtree(item, ett_nt_counted_string);
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}
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/*
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* Add 2 levels, so that the string gets attached to the
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* "Character Array" top-level item and to the top-level item
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* added above.
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*/
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return dissect_ndr_counted_string_cb(
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tvb, offset, pinfo, subtree, drep, hf_index,
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cb_str_postprocess, GINT_TO_POINTER(2 + levels));
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}
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/* Dissect a counted string in-line. */
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int
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dissect_ndr_counted_string(tvbuff_t *tvb, int offset,
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packet_info *pinfo, proto_tree *tree,
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char *drep, int hf_index, int levels)
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{
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return dissect_ndr_counted_string_helper(
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tvb, offset, pinfo, tree, drep, hf_index, levels, TRUE);
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}
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/* Dissect a counted string as a callback to dissect_ndr_pointer().
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This doesn't add a adds a proto item and subtreee for the string as
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the pointer dissection already creates one. */
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int
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dissect_ndr_counted_string_ptr(tvbuff_t *tvb, int offset,
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packet_info *pinfo, proto_tree *tree,
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char *drep)
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{
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dcerpc_info *di = pinfo->private_data;
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return dissect_ndr_counted_string_helper(
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tvb, offset, pinfo, tree, drep, di->hf_index, 0, FALSE);
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}
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/* Dissect a counted byte_array as a callback to dissect_ndr_pointer_cb() */
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static gint ett_nt_counted_byte_array = -1;
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/* Dissect a counted byte array in-line. */
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int
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dissect_ndr_counted_byte_array(tvbuff_t *tvb, int offset,
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packet_info *pinfo, proto_tree *tree,
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char *drep, int hf_index)
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{
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dcerpc_info *di = pinfo->private_data;
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proto_item *item;
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proto_tree *subtree;
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guint16 len, size;
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/* Structure starts with short, but is aligned for longs */
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ALIGN_TO_4_BYTES;
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if (di->conformant_run)
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return offset;
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item = proto_tree_add_text(tree, tvb, offset, 0,
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proto_registrar_get_name(hf_index));
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subtree = proto_item_add_subtree(item, ett_nt_counted_byte_array);
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/*
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struct {
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short len;
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short size;
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[size_is(size), length_is(len), ptr] unsigned char *string;
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} WHATEVER_THIS_IS_CALLED;
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*/
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offset = dissect_ndr_uint16(tvb, offset, pinfo, subtree, drep,
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hf_nt_cs_len, &len);
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offset = dissect_ndr_uint16(tvb, offset, pinfo, subtree, drep,
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hf_nt_cs_size, &size);
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offset = dissect_ndr_pointer(tvb, offset, pinfo, subtree, drep,
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dissect_ndr_char_cvstring, NDR_POINTER_UNIQUE,
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"Byte Array", hf_index);
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return offset;
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}
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/* This function is used to dissect a DCERPC encoded 64 bit time value.
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XXX it should be fixed both here and in dissect_smb_64bit_time so
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it can handle both BIG and LITTLE endian encodings
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*/
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int
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dissect_ndr_nt_NTTIME (tvbuff_t *tvb, int offset,
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packet_info *pinfo, proto_tree *tree,
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char *drep _U_, int hf_index)
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{
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dcerpc_info *di;
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di=pinfo->private_data;
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if(di->conformant_run){
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/*just a run to handle conformant arrays, nothing to dissect */
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return offset;
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}
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ALIGN_TO_4_BYTES;
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offset = dissect_smb_64bit_time(tvb, tree, offset, hf_index);
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return offset;
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}
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/* Define this symbol to display warnings about request/response and
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policy handle hash table collisions. This happens when a packet with
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the same conversation, smb fid and dcerpc call id occurs. I think this
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is due to a bug in the dcerpc/smb fragment reassembly code. */
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#undef DEBUG_HASH_COLL
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/*
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* Policy handle hashing
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*/
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typedef struct {
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guint8 policy_hnd[20];
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} pol_hash_key;
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typedef struct {
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guint32 open_frame, close_frame; /* Frame numbers for open/close */
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char *name; /* Name of policy handle */
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} pol_hash_value;
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#define POL_HASH_INIT_COUNT 100
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static GHashTable *pol_hash;
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static GMemChunk *pol_hash_key_chunk;
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static GMemChunk *pol_hash_value_chunk;
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/* Hash function */
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static guint pol_hash_fn(gconstpointer k)
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{
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const pol_hash_key *key = (const pol_hash_key *)k;
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/* Bytes 4-7 of the policy handle are a timestamp so should make a
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reasonable hash value */
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return key->policy_hnd[4] + (key->policy_hnd[5] << 8) +
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(key->policy_hnd[6] << 16) + (key->policy_hnd[7] << 24);
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}
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/* Return true if a policy handle is all zeros */
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static gboolean is_null_pol(e_ctx_hnd *policy_hnd)
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{
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static guint8 null_policy_hnd[20];
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return memcmp(policy_hnd, null_policy_hnd, 20) == 0;
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}
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/* Hash compare function */
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static gint pol_hash_compare(gconstpointer k1, gconstpointer k2)
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{
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const pol_hash_key *key1 = (const pol_hash_key *)k1;
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const pol_hash_key *key2 = (const pol_hash_key *)k2;
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return memcmp(key1->policy_hnd, key2->policy_hnd,
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sizeof(key1->policy_hnd)) == 0;
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}
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/* Store the open and close frame numbers of a policy handle */
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void dcerpc_smb_store_pol_pkts(e_ctx_hnd *policy_hnd, guint32 open_frame,
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guint32 close_frame)
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{
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pol_hash_key *key;
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pol_hash_value *value;
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if (is_null_pol(policy_hnd) || (open_frame == 0 && close_frame == 0))
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return;
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/* Look up existing value */
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key = g_mem_chunk_alloc(pol_hash_key_chunk);
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memcpy(&key->policy_hnd, policy_hnd, sizeof(key->policy_hnd));
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if ((value = g_hash_table_lookup(pol_hash, key))) {
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/* Update existing value */
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if (open_frame) {
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#ifdef DEBUG_HASH_COLL
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if (value->open_frame != open_frame)
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g_warning("dcerpc_smb: pol_hash open frame collision %d/%d\n", value->open_frame, open_frame);
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#endif
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value->open_frame = open_frame;
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}
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if (close_frame) {
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#ifdef DEBUG_HASH_COLL
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if (value->close_frame != close_frame)
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g_warning("dcerpc_smb: pol_hash close frame collision %d/%d\n", value->close_frame, close_frame);
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#endif
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value->close_frame = close_frame;
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}
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return;
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}
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/* Create a new value */
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value = g_mem_chunk_alloc(pol_hash_value_chunk);
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value->open_frame = open_frame;
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value->close_frame = close_frame;
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value->name = NULL;
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g_hash_table_insert(pol_hash, key, value);
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}
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/* Store a text string with a policy handle */
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void dcerpc_smb_store_pol_name(e_ctx_hnd *policy_hnd, char *name)
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{
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pol_hash_key *key;
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pol_hash_value *value;
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if (is_null_pol(policy_hnd))
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return;
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/* Look up existing value */
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key = g_mem_chunk_alloc(pol_hash_key_chunk);
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memcpy(&key->policy_hnd, policy_hnd, sizeof(key->policy_hnd));
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if ((value = g_hash_table_lookup(pol_hash, key))) {
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/* Update existing value */
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if (value->name && name) {
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#ifdef DEBUG_HASH_COLL
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if (strcmp(value->name, name) != 0)
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g_warning("dcerpc_smb: pol_hash name collision %s/%s\n", value->name, name);
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#endif
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free(value->name);
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}
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value->name = strdup(name);
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return;
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}
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/* Create a new value */
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value = g_mem_chunk_alloc(pol_hash_value_chunk);
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value->open_frame = 0;
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value->close_frame = 0;
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if (name)
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value->name = strdup(name);
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else
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value->name = strdup("<UNKNOWN>");
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g_hash_table_insert(pol_hash, key, value);
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}
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/* Retrieve a policy handle */
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gboolean dcerpc_smb_fetch_pol(e_ctx_hnd *policy_hnd, char **name,
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guint32 *open_frame, guint32 *close_frame)
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{
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pol_hash_key key;
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pol_hash_value *value;
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/* Prevent uninitialised return vars */
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if (name)
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*name = NULL;
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if (open_frame)
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*open_frame = 0;
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if (close_frame)
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*close_frame = 0;
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/* Look up existing value */
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memcpy(&key.policy_hnd, policy_hnd, sizeof(key.policy_hnd));
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value = g_hash_table_lookup(pol_hash, &key);
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/* Return name and frame numbers */
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if (value) {
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if (name)
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*name = value->name;
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if (open_frame)
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*open_frame = value->open_frame;
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if (close_frame)
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*close_frame = value->close_frame;
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}
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return value != NULL;
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}
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/* Iterator to free a policy handle key/value pair */
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static void free_pol_keyvalue(gpointer key _U_, gpointer value,
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gpointer user_data _U_)
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{
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pol_hash_value *pol_value = (pol_hash_value *)value;
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/* Free user data */
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if (pol_value->name) {
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free(pol_value->name);
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pol_value->name = NULL;
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}
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}
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/* Initialise policy handle hash */
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static void init_pol_hash(void)
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{
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/* Initialise memory chunks */
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if (pol_hash_key_chunk)
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g_mem_chunk_destroy(pol_hash_key_chunk);
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pol_hash_key_chunk = g_mem_chunk_new(
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"Policy handle hash keys", sizeof(pol_hash_key),
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POL_HASH_INIT_COUNT * sizeof(pol_hash_key), G_ALLOC_ONLY);
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if (pol_hash_value_chunk)
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g_mem_chunk_destroy(pol_hash_value_chunk);
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pol_hash_value_chunk = g_mem_chunk_new(
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"Policy handle hash values", sizeof(pol_hash_value),
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POL_HASH_INIT_COUNT * sizeof(pol_hash_value), G_ALLOC_ONLY);
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/* Initialise hash table */
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if (pol_hash) {
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g_hash_table_foreach(pol_hash, free_pol_keyvalue, NULL);
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g_hash_table_destroy(pol_hash);
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}
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pol_hash = g_hash_table_new(pol_hash_fn, pol_hash_compare);
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}
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/* Check if there is unparsed data remaining in a frame and display an
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error. I guess this could be made into an exception like the malformed
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frame exception. For the DCERPC over SMB dissectors a long frame
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indicates a bug in a dissector. */
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void dcerpc_smb_check_long_frame(tvbuff_t *tvb, int offset,
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packet_info *pinfo, proto_tree *tree)
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{
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if (tvb_length_remaining(tvb, offset) != 0) {
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proto_tree_add_text(
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tree, tvb, offset, tvb_length_remaining(tvb, offset),
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"[Long frame (%d bytes): SPOOLSS]",
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tvb_length_remaining(tvb, offset));
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if (check_col(pinfo->cinfo, COL_INFO))
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"[Long frame (%d bytes): SPOOLSS]",
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tvb_length_remaining(tvb, offset));
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}
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}
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/* Dissect a NT status code */
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int
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dissect_ntstatus(tvbuff_t *tvb, gint offset, packet_info *pinfo,
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proto_tree *tree, char *drep,
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int hfindex, guint32 *pdata)
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{
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guint32 status;
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offset = dissect_ndr_uint32(tvb, offset, pinfo, tree, drep,
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hfindex, &status);
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if (status != 0 && check_col(pinfo->cinfo, COL_INFO))
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col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
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val_to_str(status, NT_errors,
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"Unknown error 0x%08x"));
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if (pdata)
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*pdata = status;
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return offset;
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}
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|
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/* Dissect a DOS status code */
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|
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int
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dissect_doserror(tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
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proto_tree *tree, char *drep,
|
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int hfindex, guint32 *pdata)
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{
|
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guint32 status;
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|
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offset = dissect_ndr_uint32(tvb, offset, pinfo, tree, drep,
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hfindex, &status);
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|
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if (status != 0 && check_col(pinfo->cinfo, COL_INFO))
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col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
|
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val_to_str(status, DOS_errors,
|
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"Unknown error 0x%08x"));
|
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if (pdata)
|
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*pdata = status;
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|
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return offset;
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}
|
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|
|
/* Dissect a NT policy handle */
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|
|
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static int hf_nt_policy_open_frame = -1;
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static int hf_nt_policy_close_frame = -1;
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static gint ett_nt_policy_hnd = -1;
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int
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dissect_nt_policy_hnd(tvbuff_t *tvb, gint offset, packet_info *pinfo,
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proto_tree *tree, char *drep, int hfindex,
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e_ctx_hnd *pdata, gboolean is_open, gboolean is_close)
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{
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proto_item *item;
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proto_tree *subtree;
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e_ctx_hnd hnd;
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guint32 open_frame = 0, close_frame = 0;
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char *name;
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int old_offset = offset;
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/* Add to proto tree */
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item = proto_tree_add_text(tree, tvb, offset, sizeof(e_ctx_hnd),
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"Policy Handle");
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subtree = proto_item_add_subtree(item, ett_nt_policy_hnd);
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offset = dissect_ndr_ctx_hnd(tvb, offset, pinfo, subtree, drep,
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hfindex, &hnd);
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/* Store request/reply information */
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dcerpc_smb_store_pol_pkts(&hnd, 0, is_close ? pinfo->fd->num : 0);
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dcerpc_smb_store_pol_pkts(&hnd, is_open ? pinfo->fd->num: 0, 0);
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/* Insert request/reply information if known */
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if (dcerpc_smb_fetch_pol(&hnd, &name, &open_frame, &close_frame)) {
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if (open_frame)
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proto_tree_add_uint(
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subtree, hf_nt_policy_open_frame, tvb,
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old_offset, sizeof(e_ctx_hnd), open_frame);
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if (close_frame)
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proto_tree_add_uint(
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subtree, hf_nt_policy_close_frame, tvb,
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old_offset, sizeof(e_ctx_hnd), close_frame);
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if (name != NULL)
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proto_item_append_text(item, ": %s", name);
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}
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if (pdata)
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*pdata = hnd;
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return offset;
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}
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/* Some helper routines to dissect a range of uint8 characters. I don't
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think these are "official" NDR representations and are probably specific
|
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to NT so for the moment they're put here instead of in packet-dcerpc.c
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and packet-dcerpc-ndr.c. */
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int
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dissect_dcerpc_uint8s(tvbuff_t *tvb, gint offset, packet_info *pinfo _U_,
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proto_tree *tree, char *drep, int hfindex,
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int length, const guint8 **pdata)
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{
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const guint8 *data;
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data = (const guint8 *)tvb_get_ptr(tvb, offset, length);
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if (tree) {
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proto_tree_add_item (tree, hfindex, tvb, offset, length, (drep[0] & 0x10));
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}
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if (pdata)
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*pdata = data;
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return offset + length;
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}
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|
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int
|
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dissect_ndr_uint8s(tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
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proto_tree *tree, char *drep,
|
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int hfindex, int length, const guint8 **pdata)
|
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{
|
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dcerpc_info *di;
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|
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di=pinfo->private_data;
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if(di->conformant_run){
|
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/* just a run to handle conformant arrays, no scalars to dissect */
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return offset;
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}
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|
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/* no alignment needed */
|
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return dissect_dcerpc_uint8s(tvb, offset, pinfo,
|
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tree, drep, hfindex, length, pdata);
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}
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|
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int
|
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dissect_dcerpc_uint16s(tvbuff_t *tvb, gint offset, packet_info *pinfo _U_,
|
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proto_tree *tree, char *drep, int hfindex,
|
|
int length)
|
|
{
|
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if (tree) {
|
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proto_tree_add_item (tree, hfindex, tvb, offset, length * 2, (drep[0] & 0x10));
|
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}
|
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|
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return offset + length * 2;
|
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}
|
|
|
|
int
|
|
dissect_ndr_uint16s(tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree, char *drep,
|
|
int hfindex, int length)
|
|
{
|
|
dcerpc_info *di;
|
|
|
|
di=pinfo->private_data;
|
|
if(di->conformant_run){
|
|
/* just a run to handle conformant arrays, no scalars to dissect */
|
|
return offset;
|
|
}
|
|
|
|
if (offset % 2)
|
|
offset++;
|
|
|
|
return dissect_dcerpc_uint16s(tvb, offset, pinfo,
|
|
tree, drep, hfindex, length);
|
|
}
|
|
|
|
/*
|
|
* Helper routines for dissecting NDR strings
|
|
*/
|
|
|
|
void cb_str_postprocess(packet_info *pinfo, proto_tree *tree _U_,
|
|
proto_item *item, tvbuff_t *tvb,
|
|
int start_offset, int end_offset,
|
|
void *callback_args)
|
|
{
|
|
gint options = GPOINTER_TO_INT(callback_args);
|
|
gint levels = CB_STR_ITEM_LEVELS(options);
|
|
char *s;
|
|
|
|
/* Align start_offset on 4-byte boundary. */
|
|
|
|
if (start_offset % 4)
|
|
start_offset += 4 - (start_offset % 4);
|
|
|
|
/* Get string value */
|
|
|
|
if ((end_offset - start_offset) <= 12)
|
|
return; /* XXX: Use unistr2 dissector instead? */
|
|
|
|
s = tvb_fake_unicode(
|
|
tvb, start_offset + 12, (end_offset - start_offset - 12) / 2,
|
|
TRUE);
|
|
|
|
/* Append string to COL_INFO */
|
|
|
|
if (options & CB_STR_COL_INFO) {
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", s);
|
|
}
|
|
|
|
/* Append string to upper-level proto_items */
|
|
|
|
if (levels > 0 && item && s && s[0]) {
|
|
proto_item_append_text(item, ": %s", s);
|
|
item = item->parent;
|
|
levels--;
|
|
if (levels > 0) {
|
|
proto_item_append_text(item, ": %s", s);
|
|
item = item->parent;
|
|
levels--;
|
|
while (levels > 0) {
|
|
proto_item_append_text(item, " %s", s);
|
|
item = item->parent;
|
|
levels--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Save string to dcv->private_data */
|
|
|
|
if (options & CB_STR_SAVE) {
|
|
dcerpc_info *di = (dcerpc_info *)pinfo->private_data;
|
|
dcerpc_call_value *dcv = (dcerpc_call_value *)di->call_data;
|
|
|
|
dcv->private_data = g_strdup(s);
|
|
}
|
|
|
|
g_free(s);
|
|
}
|
|
|
|
/* Dissect a pointer to a NDR string and append the string value to the
|
|
proto_item. */
|
|
|
|
int dissect_ndr_str_pointer_item(tvbuff_t *tvb, gint offset,
|
|
packet_info *pinfo, proto_tree *tree,
|
|
char *drep, int type, char *text,
|
|
int hf_index, int levels)
|
|
{
|
|
return dissect_ndr_pointer_cb(
|
|
tvb, offset, pinfo, tree, drep,
|
|
dissect_ndr_wchar_cvstring, type, text, hf_index,
|
|
cb_str_postprocess, GINT_TO_POINTER(levels + 1));
|
|
}
|
|
|
|
/*
|
|
* Register ett/hf values and perform DCERPC over SMB specific
|
|
* initialisation.
|
|
*/
|
|
void dcerpc_smb_init(int proto_dcerpc)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
|
|
/* String handling */
|
|
|
|
{ &hf_nt_cs_size,
|
|
{ "Size", "nt.str.size", FT_UINT16, BASE_DEC,
|
|
NULL, 0x0, "Size of string in short integers",
|
|
HFILL }},
|
|
|
|
{ &hf_nt_cs_len,
|
|
{ "Length", "nt.str.len", FT_UINT16, BASE_DEC,
|
|
NULL, 0x0, "Length of string in short integers",
|
|
HFILL }},
|
|
|
|
/* Policy handles */
|
|
|
|
{ &hf_nt_policy_open_frame,
|
|
{ "Frame handle opened", "dcerpc.nt.open_frame",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Frame handle opened", HFILL }},
|
|
|
|
{ &hf_nt_policy_close_frame,
|
|
{ "Frame handle close", "dcerpc.nt.close_frame",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Frame handle closed", HFILL }},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_nt_unicode_string,
|
|
&ett_nt_counted_string,
|
|
&ett_nt_counted_byte_array,
|
|
&ett_nt_policy_hnd,
|
|
};
|
|
|
|
/* Register ett's and hf's */
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
proto_register_field_array(proto_dcerpc, hf, array_length(hf));
|
|
|
|
/* Initialise policy handle hash */
|
|
|
|
init_pol_hash();
|
|
}
|