![Bill Meier](/assets/img/avatar_default.png)
This fixes a major memory leak in the NCP dissector caused by the fact that "in recent versions of GLib" (>= 2.10 ?) g_mem_chunk_destroy doesn't actually free up the mem_chunk memory. Note that there still appears to be one or more smaller memory leaks somehow associated with NCP dissection. Example: A 40M capture file with mostly NCP frames which resulted in a memory usage increase of about 20M each time the file was reloaded now results in a 400K-800K memory usage increase each time the file is reloaded. (If NCP dissection is disabled, there is minimal memory expansion each time the file is reloaded). svn path=/trunk/; revision=30481
1125 lines
43 KiB
C
1125 lines
43 KiB
C
/* packet-ncp.c
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* Routines for NetWare Core Protocol
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* Gilbert Ramirez <gram@alumni.rice.edu>
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* Modified to allow NCP over TCP/IP decodes by James Coe <jammer@cin.net>
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* Modified to decode server op-lock, packet signature,
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* & NDS packets by Greg Morris <gmorris@novell.com>
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*
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* Portions Copyright (c) by Gilbert Ramirez 2000-2002
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* Portions Copyright (c) by James Coe 2000-2002
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* Portions Copyright (c) Novell, Inc. 2000-2003
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2000 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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/* XXX:
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ToDo: Find and fix possible memory leak(s):
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Example:
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A 40M capture file with mostly NCP frames results
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in a 400K-800K memory usage increase each time the file is reloaded.
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(If the NCP dissection is disabled, there is minimal memory usage
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increase each time the file is reloaded).
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/emem.h>
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#include <epan/prefs.h>
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#include "packet-ipx.h"
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#include "packet-tcp.h"
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#include "packet-ncp-int.h"
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#include <epan/reassemble.h>
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#include <epan/conversation.h>
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#include <epan/tap.h>
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int proto_ncp = -1;
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static int hf_ncp_ip_ver = -1;
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static int hf_ncp_ip_length = -1;
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static int hf_ncp_ip_rplybufsize = -1;
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static int hf_ncp_ip_sig = -1;
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static int hf_ncp_ip_packetsig = -1;
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static int hf_ncp_type = -1;
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static int hf_ncp_seq = -1;
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static int hf_ncp_connection = -1;
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static int hf_ncp_task = -1;
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static int hf_ncp_stream_type = -1;
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static int hf_ncp_system_flags = -1;
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static int hf_ncp_system_flags_abt = -1;
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static int hf_ncp_system_flags_eob = -1;
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static int hf_ncp_system_flags_sys = -1;
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static int hf_ncp_system_flags_bsy = -1;
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static int hf_ncp_system_flags_lst = -1;
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static int hf_ncp_src_connection = -1;
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static int hf_ncp_dst_connection = -1;
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static int hf_ncp_packet_seqno = -1;
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static int hf_ncp_delay_time = -1;
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static int hf_ncp_burst_seqno = -1;
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static int hf_ncp_ack_seqno = -1;
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static int hf_ncp_burst_len = -1;
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static int hf_ncp_burst_offset = -1;
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static int hf_ncp_data_offset = -1;
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static int hf_ncp_data_bytes = -1;
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static int hf_ncp_missing_fraglist_count = -1;
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static int hf_ncp_missing_data_offset = -1;
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static int hf_ncp_missing_data_count = -1;
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static int hf_ncp_oplock_flag = -1;
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static int hf_ncp_oplock_handle = -1;
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static int hf_ncp_completion_code = -1;
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static int hf_ncp_connection_status = -1;
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static int hf_ncp_slot = -1;
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static int hf_ncp_control_code = -1;
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static int hf_ncp_fragment_handle = -1;
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static int hf_lip_echo = -1;
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static int hf_ncp_burst_command = -1;
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static int hf_ncp_burst_file_handle = -1;
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static int hf_ncp_burst_reserved = -1;
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gint ett_ncp = -1;
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gint ett_nds = -1;
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gint ett_nds_segments = -1;
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gint ett_nds_segment = -1;
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static gint ett_ncp_system_flags = -1;
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static struct novell_tap ncp_tap;
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struct ncp_common_header header;
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struct ncp_common_header *ncp_hdr;
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/* Tables for reassembly of fragments. */
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GHashTable *nds_fragment_table = NULL;
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GHashTable *nds_reassembled_table = NULL;
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dissector_handle_t nds_data_handle;
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/* desegmentation of NCP over TCP */
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static gboolean ncp_desegment = TRUE;
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static dissector_handle_t data_handle;
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#define TCP_PORT_NCP 524
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#define UDP_PORT_NCP 524
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#define NCP_RQST_HDR_LENGTH 7
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#define NCP_RPLY_HDR_LENGTH 8
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/* These are the header structures to handle NCP over IP */
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#define NCPIP_RQST 0x446d6454 /* "DmdT" */
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#define NCPIP_RPLY 0x744e6350 /* "tNcP" */
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struct ncp_ip_header {
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guint32 signature;
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guint32 length;
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};
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/* This header only appears on NCP over IP request packets */
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struct ncp_ip_rqhdr {
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guint32 version;
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guint32 rplybufsize;
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};
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static const value_string ncp_ip_signature[] = {
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{ NCPIP_RQST, "Demand Transport (Request)" },
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{ NCPIP_RPLY, "Transport is NCP (Reply)" },
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{ 0, NULL },
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};
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static const value_string burst_command[] = {
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{ 0x01000000, "Burst Read" },
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{ 0x02000000, "Burst Write" },
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{ 0, NULL },
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};
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/* The information in this module comes from:
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NetWare LAN Analysis, Second Edition
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Laura A. Chappell and Dan E. Hakes
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(c) 1994 Novell, Inc.
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Novell Press, San Jose.
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ISBN: 0-7821-1362-1
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And from the ncpfs source code by Volker Lendecke
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And:
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Programmer's Guide to the NetWare Core Protocol
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Steve Conner & Diane Conner
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(c) 1996 by Steve Conner & Diane Conner
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Published by Annabooks, San Diego, California
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ISBN: 0-929392-31-0
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And:
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http:developer.novell.com
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NCP documentation
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*/
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static const value_string ncp_type_vals[] = {
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{ NCP_ALLOCATE_SLOT, "Create a service connection" },
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{ NCP_SERVICE_REQUEST, "Service request" },
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{ NCP_SERVICE_REPLY, "Service reply" },
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{ NCP_WATCHDOG, "Watchdog" },
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{ NCP_DEALLOCATE_SLOT, "Destroy service connection" },
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{ NCP_BROADCAST_SLOT, "Server Broadcast" },
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{ NCP_BURST_MODE_XFER, "Burst mode transfer" },
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{ NCP_POSITIVE_ACK, "Request being processed" },
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{ NCP_LIP_ECHO, "Large Internet Packet Echo" },
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{ 0, NULL }
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};
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static const value_string ncp_oplock_vals[] = {
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{ 0x21, "Message Waiting" },
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{ 0x24, "Clear Op-lock" },
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{ 0, NULL }
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};
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/* Conversation Struct so we can detect NCP server sessions */
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typedef struct {
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conversation_t *conversation;
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guint32 nwconnection;
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guint8 nwtask;
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} mncp_rhash_key;
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/* Store the packet number for the start of the NCP session.
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* Note sessions are defined as
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* NCP Connection + NCP Task == Unique NCP server session
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* It is normal for multiple sessions per connection to exist
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* These are normally different applications running on multi-tasking
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* Operating Systems.
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*/
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typedef struct {
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guint32 session_start_packet_num;
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} mncp_rhash_value;
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static GHashTable *mncp_rhash = NULL;
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/* Hash Functions */
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static gint
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mncp_equal(gconstpointer v, gconstpointer v2)
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{
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const mncp_rhash_key *val1 = (const mncp_rhash_key*)v;
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const mncp_rhash_key *val2 = (const mncp_rhash_key*)v2;
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if (val1->conversation == val2->conversation && val1->nwconnection == val2->nwconnection && val1->nwtask == val2->nwtask) {
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return 1;
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}
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return 0;
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}
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static guint
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mncp_hash(gconstpointer v)
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{
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const mncp_rhash_key *mncp_key = (const mncp_rhash_key*)v;
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return GPOINTER_TO_UINT(mncp_key->conversation)+mncp_key->nwconnection+mncp_key->nwtask;
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}
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/* Initializes the hash table each time a new
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* file is loaded or re-loaded in wireshark */
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static void
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mncp_init_protocol(void)
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{
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if (mncp_rhash)
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g_hash_table_destroy(mncp_rhash);
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mncp_rhash = g_hash_table_new(mncp_hash, mncp_equal);
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}
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/* After the sequential run, we don't need the ncp_request hash and keys
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* anymore; the lookups have already been done and the vital info
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* saved in the reply-packets' private_data in the frame_data struct. */
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static void
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mncp_postseq_cleanup(void)
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{
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}
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static mncp_rhash_value*
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mncp_hash_insert(conversation_t *conversation, guint32 nwconnection, guint8 nwtask, packet_info *pinfo)
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{
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mncp_rhash_key *key;
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mncp_rhash_value *value;
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/* Now remember the request, so we can find it if we later
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a reply to it. Track by conversation, connection, and task number.
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in NetWare these values determine each unique session */
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key = se_alloc(sizeof(mncp_rhash_key));
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key->conversation = conversation;
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key->nwconnection = nwconnection;
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key->nwtask = nwtask;
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value = se_alloc(sizeof(mncp_rhash_value));
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g_hash_table_insert(mncp_rhash, key, value);
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if (ncp_echo_conn && nwconnection != 65535) {
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expert_add_info_format(pinfo, NULL, PI_RESPONSE_CODE, PI_CHAT, "Detected New Server Session. Connection %d, Task %d", nwconnection, nwtask);
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value->session_start_packet_num = pinfo->fd->num;
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}
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return value;
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}
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/* Returns the ncp_rec*, or NULL if not found. */
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static mncp_rhash_value*
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mncp_hash_lookup(conversation_t *conversation, guint32 nwconnection, guint8 nwtask)
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{
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mncp_rhash_key key;
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key.conversation = conversation;
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key.nwconnection = nwconnection;
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key.nwtask = nwtask;
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return g_hash_table_lookup(mncp_rhash, &key);
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}
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/*
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* Burst packet system flags.
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*/
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#define ABT 0x04 /* Abort request */
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#define BSY 0x08 /* Server Busy */
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#define EOB 0x10 /* End of burst */
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#define LST 0x40 /* Include Fragment List */
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#define SYS 0x80 /* System packet */
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static void
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dissect_ncp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean is_tcp)
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{
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proto_tree *ncp_tree = NULL;
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proto_item *ti;
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struct ncp_ip_header ncpiph;
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struct ncp_ip_rqhdr ncpiphrq;
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guint16 ncp_burst_seqno, ncp_ack_seqno;
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guint16 flags = 0;
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proto_tree *flags_tree = NULL;
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int hdr_offset = 0;
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int commhdr = 0;
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int offset = 0;
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gint length_remaining;
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tvbuff_t *next_tvb;
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guint32 testvar = 0, ncp_burst_command, burst_len, burst_off, burst_file;
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guint8 subfunction;
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guint32 nw_connection = 0, data_offset;
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guint16 data_len = 0;
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guint16 missing_fraglist_count = 0;
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mncp_rhash_value *request_value = NULL;
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conversation_t *conversation;
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proto_item *expert_item;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "NCP");
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col_clear(pinfo->cinfo, COL_INFO);
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hdr_offset = 0;
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ncp_hdr = &header;
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commhdr = hdr_offset;
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ti = proto_tree_add_item(tree, proto_ncp, tvb, 0, -1, FALSE);
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ncp_tree = proto_item_add_subtree(ti, ett_ncp);
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if (is_tcp) {
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if (tvb_get_ntohl(tvb, hdr_offset) != NCPIP_RQST && tvb_get_ntohl(tvb, hdr_offset) != NCPIP_RPLY)
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commhdr += 1;
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/* Get NCPIP Header data */
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ncpiph.signature = tvb_get_ntohl(tvb, commhdr);
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proto_tree_add_uint(ncp_tree, hf_ncp_ip_sig, tvb, commhdr, 4, ncpiph.signature);
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ncpiph.length = (0x7fffffff & tvb_get_ntohl(tvb, commhdr+4));
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proto_tree_add_uint(ncp_tree, hf_ncp_ip_length, tvb, commhdr+4, 4, ncpiph.length);
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commhdr += 8;
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if (ncpiph.signature == NCPIP_RQST) {
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ncpiphrq.version = tvb_get_ntohl(tvb, commhdr);
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proto_tree_add_uint(ncp_tree, hf_ncp_ip_ver, tvb, commhdr, 4, ncpiphrq.version);
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commhdr += 4;
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ncpiphrq.rplybufsize = tvb_get_ntohl(tvb, commhdr);
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proto_tree_add_uint(ncp_tree, hf_ncp_ip_rplybufsize, tvb, commhdr, 4, ncpiphrq.rplybufsize);
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commhdr += 4;
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}
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/* Check to see if this is a valid offset, otherwise increment for packet signature */
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if (match_strval(tvb_get_ntohs(tvb, commhdr), ncp_type_vals)==NULL) {
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/* Check to see if we have a valid type after packet signature length */
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if (match_strval(tvb_get_ntohs(tvb, commhdr+8), ncp_type_vals)!=NULL) {
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proto_tree_add_item(ncp_tree, hf_ncp_ip_packetsig, tvb, commhdr, 8, FALSE);
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commhdr += 8;
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}
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}
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} else {
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/* Initialize this structure, we use it below */
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memset(&ncpiph, 0, sizeof(ncpiph));
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}
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header.type = tvb_get_ntohs(tvb, commhdr);
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header.sequence = tvb_get_guint8(tvb, commhdr+2);
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header.conn_low = tvb_get_guint8(tvb, commhdr+3);
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header.task = tvb_get_guint8(tvb, commhdr+4);
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header.conn_high = tvb_get_guint8(tvb, commhdr+5);
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proto_tree_add_uint(ncp_tree, hf_ncp_type, tvb, commhdr, 2, header.type);
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nw_connection = (header.conn_high*256)+header.conn_low;
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/* Ok, we need to track the conversation so that we can
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* determine if a new server session is occuring for this
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* connection.
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*/
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conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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PT_NCP, (guint32) pinfo->srcport, (guint32) pinfo->destport,
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0);
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if ((ncpiph.length & 0x80000000) || ncpiph.signature == NCPIP_RPLY) {
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/* First time through we will record the initial connection and task
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* values
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*/
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if (!pinfo->fd->flags.visited) {
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if (conversation != NULL) {
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/* find the record telling us the
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* request made that caused this
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* reply
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*/
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request_value = mncp_hash_lookup(conversation, nw_connection, header.task);
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/* if for some reason we have no
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* conversation in our hash, create
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* one */
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if (request_value == NULL) {
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request_value = mncp_hash_insert(conversation, nw_connection, header.task, pinfo);
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}
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} else {
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/* It's not part of any conversation
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* - create a new one.
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*/
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conversation = conversation_new(pinfo->fd->num, &pinfo->src,
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&pinfo->dst, PT_NCP, (guint32) pinfo->srcport, (guint32) pinfo->destport, 0);
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request_value = mncp_hash_insert(conversation, nw_connection, header.task, pinfo);
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}
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/* If this is a request packet then we
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* might have a new task
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*/
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if (ncpiph.signature == NCPIP_RPLY) {
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/* Now on reply packets we have to
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* use the state of the original
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* request packet, so look up the
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* request value and check the task number
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*/
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request_value = mncp_hash_lookup(conversation, nw_connection, header.task);
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}
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} else {
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/* Get request value data */
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request_value = mncp_hash_lookup(conversation, nw_connection, header.task);
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if (request_value) {
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if ((request_value->session_start_packet_num == pinfo->fd->num) && ncp_echo_conn)
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{
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expert_add_info_format(pinfo, NULL, PI_RESPONSE_CODE, PI_CHAT, "Detected New Server Session. Connection %d, Task %d", nw_connection, header.task);
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}
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}
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}
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} else {
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if (!pinfo->fd->flags.visited) {
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if (conversation != NULL) {
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/* find the record telling us the
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* request made that caused this
|
|
* reply
|
|
*/
|
|
request_value = mncp_hash_lookup(conversation, nw_connection, header.task);
|
|
/* if for some reason we have no
|
|
* conversation in our hash, create
|
|
* one */
|
|
if (request_value == NULL) {
|
|
request_value = mncp_hash_insert(conversation, nw_connection, header.task, pinfo);
|
|
}
|
|
} else {
|
|
/* It's not part of any conversation
|
|
* - create a new one.
|
|
*/
|
|
conversation = conversation_new(pinfo->fd->num, &pinfo->src,
|
|
&pinfo->dst, PT_NCP, (guint32) pinfo->srcport, (guint32) pinfo->destport, 0);
|
|
request_value = mncp_hash_insert(conversation, nw_connection, header.task, pinfo);
|
|
}
|
|
/* find the record telling us the request
|
|
* made that caused this reply
|
|
*/
|
|
} else {
|
|
request_value = mncp_hash_lookup(conversation, nw_connection, header.task);
|
|
if (request_value) {
|
|
if ((request_value->session_start_packet_num == pinfo->fd->num) && ncp_echo_conn)
|
|
{
|
|
expert_add_info_format(pinfo, NULL, PI_RESPONSE_CODE, PI_CHAT, "Detected New Server Session. Connection %d, Task %d", nw_connection, header.task);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
tap_queue_packet(ncp_tap.hdr, pinfo, ncp_hdr);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(header.type, ncp_type_vals, "Unknown type (0x%04x)"));
|
|
}
|
|
|
|
/*
|
|
* Process the packet-type-specific header.
|
|
*/
|
|
switch (header.type) {
|
|
|
|
case NCP_BROADCAST_SLOT: /* Server Broadcast */
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_seq, tvb, commhdr + 2, 1, header.sequence);
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_connection,tvb, commhdr + 3, 3, nw_connection);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_task, tvb, commhdr + 4, 1, FALSE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_oplock_flag, tvb, commhdr + 9, 1, tvb_get_guint8(tvb, commhdr+9));
|
|
proto_tree_add_item(ncp_tree, hf_ncp_oplock_handle, tvb, commhdr + 10, 4, FALSE);
|
|
if ((tvb_get_guint8(tvb, commhdr+9)==0x24) && ncp_echo_file)
|
|
{
|
|
expert_add_info_format(pinfo, NULL, PI_RESPONSE_CODE, PI_CHAT, "Server requesting station to clear oplock on handle - %08x", tvb_get_ntohl(tvb, commhdr+10));
|
|
}
|
|
break;
|
|
|
|
case NCP_LIP_ECHO: /* Lip Echo Packet */
|
|
proto_tree_add_item(ncp_tree, hf_lip_echo, tvb, commhdr, 13, FALSE);
|
|
break;
|
|
|
|
case NCP_BURST_MODE_XFER: /* Packet Burst Packet */
|
|
/*
|
|
* XXX - we should keep track of whether there's a burst
|
|
* outstanding on a connection and, if not, treat the
|
|
* beginning of the data as a burst header.
|
|
*
|
|
* The burst header contains:
|
|
*
|
|
* 4 bytes of little-endian function number:
|
|
* 1 = read, 2 = write;
|
|
*
|
|
* 4 bytes of file handle;
|
|
*
|
|
* 8 reserved bytes;
|
|
*
|
|
* 4 bytes of big-endian file offset;
|
|
*
|
|
* 4 bytes of big-endian byte count.
|
|
*
|
|
* The data follows for a burst write operation.
|
|
*
|
|
* The first packet of a burst read reply contains:
|
|
*
|
|
* 4 bytes of little-endian result code:
|
|
* 0: No error
|
|
* 1: Initial error
|
|
* 2: I/O error
|
|
* 3: No data read;
|
|
*
|
|
* 4 bytes of returned byte count (big-endian?).
|
|
*
|
|
* The data follows.
|
|
*
|
|
* Each burst of a write request is responded to with a
|
|
* burst packet with a 2-byte little-endian result code:
|
|
*
|
|
* 0: Write successful
|
|
* 4: Write error
|
|
*/
|
|
flags = tvb_get_guint8(tvb, commhdr + 2);
|
|
|
|
ti = proto_tree_add_uint(ncp_tree, hf_ncp_system_flags,
|
|
tvb, commhdr + 2, 1, flags);
|
|
flags_tree = proto_item_add_subtree(ti, ett_ncp_system_flags);
|
|
|
|
proto_tree_add_item(flags_tree, hf_ncp_system_flags_abt,
|
|
tvb, commhdr + 2, 1, FALSE);
|
|
if (flags & ABT) {
|
|
proto_item_append_text(ti, " ABT");
|
|
}
|
|
flags&=(~( ABT ));
|
|
|
|
proto_tree_add_item(flags_tree, hf_ncp_system_flags_bsy,
|
|
tvb, commhdr + 2, 1, FALSE);
|
|
if (flags & BSY) {
|
|
proto_item_append_text(ti, " BSY");
|
|
}
|
|
flags&=(~( BSY ));
|
|
|
|
proto_tree_add_item(flags_tree, hf_ncp_system_flags_eob,
|
|
tvb, commhdr + 2, 1, FALSE);
|
|
if (flags & EOB) {
|
|
proto_item_append_text(ti, " EOB");
|
|
}
|
|
flags&=(~( EOB ));
|
|
|
|
proto_tree_add_item(flags_tree, hf_ncp_system_flags_lst,
|
|
tvb, commhdr + 2, 1, FALSE);
|
|
if (flags & LST) {
|
|
proto_item_append_text(ti, " LST");
|
|
}
|
|
flags&=(~( LST ));
|
|
|
|
proto_tree_add_item(flags_tree, hf_ncp_system_flags_sys,
|
|
tvb, commhdr + 2, 1, FALSE);
|
|
if (flags & SYS) {
|
|
proto_item_append_text(ti, " SYS");
|
|
}
|
|
flags&=(~( SYS ));
|
|
|
|
|
|
proto_tree_add_item(ncp_tree, hf_ncp_stream_type,
|
|
tvb, commhdr + 3, 1, FALSE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_src_connection,
|
|
tvb, commhdr + 4, 4, FALSE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_dst_connection,
|
|
tvb, commhdr + 8, 4, FALSE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_packet_seqno,
|
|
tvb, commhdr + 12, 4, FALSE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_delay_time,
|
|
tvb, commhdr + 16, 4, FALSE);
|
|
ncp_burst_seqno = tvb_get_ntohs(tvb, commhdr+20);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_burst_seqno,
|
|
tvb, commhdr + 20, 2, FALSE);
|
|
ncp_ack_seqno = tvb_get_ntohs(tvb, commhdr+22);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_ack_seqno,
|
|
tvb, commhdr + 22, 2, FALSE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_burst_len,
|
|
tvb, commhdr + 24, 4, FALSE);
|
|
data_offset = tvb_get_ntohl(tvb, commhdr + 28);
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_data_offset,
|
|
tvb, commhdr + 28, 4, data_offset);
|
|
data_len = tvb_get_ntohs(tvb, commhdr + 32);
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_data_bytes,
|
|
tvb, commhdr + 32, 2, data_len);
|
|
missing_fraglist_count = tvb_get_ntohs(tvb, commhdr + 34);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_missing_fraglist_count,
|
|
tvb, commhdr + 34, 2, FALSE);
|
|
offset = commhdr + 36;
|
|
if (!(flags & SYS) && ncp_burst_seqno == ncp_ack_seqno &&
|
|
data_offset == 0) {
|
|
/*
|
|
* This is either a Burst Read or Burst Write
|
|
* command. The data length includes the burst
|
|
* mode header, plus any data in the command
|
|
* (there shouldn't be any in a read, but there
|
|
* might be some in a write).
|
|
*/
|
|
if (data_len < 4)
|
|
return;
|
|
ncp_burst_command = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_burst_command,
|
|
tvb, offset, 4, FALSE);
|
|
offset += 4;
|
|
data_len -= 4;
|
|
|
|
if (data_len < 4)
|
|
return;
|
|
burst_file = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_burst_file_handle,
|
|
tvb, offset, 4, FALSE);
|
|
offset += 4;
|
|
data_len -= 4;
|
|
|
|
if (data_len < 8)
|
|
return;
|
|
proto_tree_add_item(ncp_tree, hf_ncp_burst_reserved,
|
|
tvb, offset, 8, FALSE);
|
|
offset += 8;
|
|
data_len -= 8;
|
|
|
|
if (data_len < 4)
|
|
return;
|
|
burst_off = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_burst_offset,
|
|
tvb, offset, 4, burst_off);
|
|
offset += 4;
|
|
data_len -= 4;
|
|
|
|
if (data_len < 4)
|
|
return;
|
|
burst_len = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_burst_len,
|
|
tvb, offset, 4, burst_len);
|
|
offset += 4;
|
|
data_len -= 4;
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s %d bytes starting at offset %d in file 0x%08x",
|
|
val_to_str(ncp_burst_command,
|
|
burst_command, "Unknown (0x%08x)"),
|
|
burst_len, burst_off, burst_file);
|
|
}
|
|
break;
|
|
} else {
|
|
if (tvb_get_guint8(tvb, commhdr + 2) & 0x10) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, "End of Burst");
|
|
}
|
|
}
|
|
break;
|
|
|
|
case NCP_ALLOCATE_SLOT: /* Allocate Slot Request */
|
|
length_remaining = tvb_length_remaining(tvb, commhdr + 4);
|
|
if (length_remaining > 4) {
|
|
testvar = tvb_get_ntohl(tvb, commhdr+4);
|
|
if (testvar == 0x4c495020) {
|
|
proto_tree_add_item(ncp_tree, hf_lip_echo, tvb, commhdr+4, 13, FALSE);
|
|
break;
|
|
}
|
|
}
|
|
/* otherwise fall through */
|
|
|
|
case NCP_POSITIVE_ACK: /* Positive Acknowledgement */
|
|
case NCP_SERVICE_REQUEST: /* Server NCP Request */
|
|
case NCP_SERVICE_REPLY: /* Server NCP Reply */
|
|
case NCP_WATCHDOG: /* Watchdog Packet */
|
|
case NCP_DEALLOCATE_SLOT: /* Deallocate Slot Request */
|
|
default:
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_seq, tvb, commhdr + 2, 1, header.sequence);
|
|
proto_tree_add_uint(ncp_tree, hf_ncp_connection,tvb, commhdr + 3, 3, nw_connection);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_task, tvb, commhdr + 4, 1, FALSE);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Process the packet body.
|
|
*/
|
|
switch (header.type) {
|
|
|
|
case NCP_ALLOCATE_SLOT: /* Allocate Slot Request */
|
|
length_remaining = tvb_length_remaining(tvb, commhdr + 4);
|
|
if (length_remaining > 4) {
|
|
testvar = tvb_get_ntohl(tvb, commhdr+4);
|
|
if (testvar == 0x4c495020) {
|
|
proto_tree_add_text(ncp_tree, tvb, commhdr, -1,
|
|
"Lip Echo Packet");
|
|
/*break;*/
|
|
}
|
|
}
|
|
next_tvb = tvb_new_subset_remaining(tvb, commhdr);
|
|
dissect_ncp_request(next_tvb, pinfo, nw_connection,
|
|
header.sequence, header.type, ncp_tree);
|
|
break;
|
|
|
|
case NCP_DEALLOCATE_SLOT: /* Deallocate Slot Request */
|
|
next_tvb = tvb_new_subset_remaining(tvb, commhdr);
|
|
dissect_ncp_request(next_tvb, pinfo, nw_connection,
|
|
header.sequence, header.type, ncp_tree);
|
|
break;
|
|
|
|
case NCP_SERVICE_REQUEST: /* Server NCP Request */
|
|
case NCP_BROADCAST_SLOT: /* Server Broadcast Packet */
|
|
next_tvb = tvb_new_subset_remaining(tvb, commhdr);
|
|
if (tvb_get_guint8(tvb, commhdr+6) == 0x68) {
|
|
subfunction = tvb_get_guint8(tvb, commhdr+7);
|
|
switch (subfunction) {
|
|
|
|
case 0x02: /* NDS Frag Packet to decode */
|
|
dissect_nds_request(next_tvb, pinfo,
|
|
nw_connection, header.sequence,
|
|
header.type, ncp_tree);
|
|
break;
|
|
|
|
case 0x01: /* NDS Ping */
|
|
dissect_ping_req(next_tvb, pinfo,
|
|
nw_connection, header.sequence,
|
|
header.type, ncp_tree);
|
|
break;
|
|
|
|
default:
|
|
dissect_ncp_request(next_tvb, pinfo,
|
|
nw_connection, header.sequence,
|
|
header.type, ncp_tree);
|
|
break;
|
|
}
|
|
} else {
|
|
dissect_ncp_request(next_tvb, pinfo, nw_connection,
|
|
header.sequence, header.type, ncp_tree);
|
|
}
|
|
break;
|
|
|
|
case NCP_SERVICE_REPLY: /* Server NCP Reply */
|
|
next_tvb = tvb_new_subset_remaining(tvb, commhdr);
|
|
nds_defrag(next_tvb, pinfo, nw_connection, header.sequence,
|
|
header.type, ncp_tree, &ncp_tap);
|
|
break;
|
|
|
|
case NCP_POSITIVE_ACK: /* Positive Acknowledgement */
|
|
/*
|
|
* XXX - this used to call "nds_defrag()", which would
|
|
* clear out "frags". Was that the right thing to
|
|
* do?
|
|
*/
|
|
next_tvb = tvb_new_subset_remaining(tvb, commhdr);
|
|
dissect_ncp_reply(next_tvb, pinfo, nw_connection,
|
|
header.sequence, header.type, ncp_tree, &ncp_tap);
|
|
break;
|
|
|
|
case NCP_WATCHDOG: /* Watchdog Packet */
|
|
/*
|
|
* XXX - should the completion code be interpreted as
|
|
* it is in "packet-ncp2222.inc"? If so, this
|
|
* packet should be handled by "dissect_ncp_reply()".
|
|
*/
|
|
proto_tree_add_item(ncp_tree, hf_ncp_completion_code,
|
|
tvb, commhdr + 6, 1, TRUE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_connection_status,
|
|
tvb, commhdr + 7, 1, TRUE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_slot,
|
|
tvb, commhdr + 8, 1, TRUE);
|
|
proto_tree_add_item(ncp_tree, hf_ncp_control_code,
|
|
tvb, commhdr + 9, 1, TRUE);
|
|
/*
|
|
* Display the rest of the packet as data.
|
|
*/
|
|
if (tvb_offset_exists(tvb, commhdr + 10)) {
|
|
call_dissector(data_handle,
|
|
tvb_new_subset_remaining(tvb, commhdr + 10),
|
|
pinfo, ncp_tree);
|
|
}
|
|
break;
|
|
|
|
case NCP_BURST_MODE_XFER: /* Packet Burst Packet */
|
|
if (flags & SYS) {
|
|
/*
|
|
* System packet; show missing fragments if there
|
|
* are any.
|
|
*/
|
|
while (missing_fraglist_count != 0) {
|
|
proto_tree_add_item(ncp_tree, hf_ncp_missing_data_offset,
|
|
tvb, offset, 4, FALSE);
|
|
offset += 4;
|
|
proto_tree_add_item(ncp_tree, hf_ncp_missing_data_count,
|
|
tvb, offset, 2, FALSE);
|
|
offset += 2;
|
|
missing_fraglist_count--;
|
|
}
|
|
} else {
|
|
/*
|
|
* XXX - do this by using -1 and -1 as the length
|
|
* arguments to "tvb_new_subset()" and then calling
|
|
* "tvb_set_reported_length()"? That'll throw an
|
|
* exception if "data_len" goes past the reported
|
|
* length of the packet, but that's arguably a
|
|
* feature in this case.
|
|
*/
|
|
length_remaining = tvb_length_remaining(tvb, offset);
|
|
if (length_remaining > data_len)
|
|
length_remaining = data_len;
|
|
if (data_len != 0) {
|
|
call_dissector(data_handle,
|
|
tvb_new_subset(tvb, offset,
|
|
length_remaining, data_len),
|
|
pinfo, ncp_tree);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case NCP_LIP_ECHO: /* LIP Echo Packet */
|
|
proto_tree_add_text(ncp_tree, tvb, commhdr, -1,
|
|
"Lip Echo Packet");
|
|
break;
|
|
|
|
default:
|
|
expert_item = proto_tree_add_text(ncp_tree, tvb, commhdr + 6, -1,
|
|
"%s packets not supported yet",
|
|
val_to_str(header.type, ncp_type_vals,
|
|
"Unknown type (0x%04x)"));
|
|
if (ncp_echo_err) {
|
|
expert_add_info_format(pinfo, expert_item, PI_UNDECODED, PI_NOTE, "%s packets not supported yet", val_to_str(header.type, ncp_type_vals,
|
|
"Unknown type (0x%04x)"));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_ncp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_ncp_common(tvb, pinfo, tree, FALSE);
|
|
}
|
|
|
|
static guint
|
|
get_ncp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
|
|
{
|
|
guint32 signature;
|
|
|
|
/*
|
|
* Check the NCP-over-TCP header signature, to make sure it's there.
|
|
* If it's not there, we cannot trust the next 4 bytes to be a
|
|
* packet length+"has signature" flag, so we just say the length is
|
|
* "what remains in the packet".
|
|
*/
|
|
signature = tvb_get_ntohl(tvb, offset);
|
|
if (signature != NCPIP_RQST && signature != NCPIP_RPLY)
|
|
return tvb_length_remaining(tvb, offset);
|
|
|
|
/*
|
|
* Get the length of the NCP-over-TCP packet. Strip off the "has
|
|
* signature" flag.
|
|
*/
|
|
|
|
return tvb_get_ntohl(tvb, offset + 4) & 0x7fffffff;
|
|
}
|
|
|
|
static void
|
|
dissect_ncp_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_ncp_common(tvb, pinfo, tree, TRUE);
|
|
}
|
|
|
|
static void
|
|
dissect_ncp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
tcp_dissect_pdus(tvb, pinfo, tree, ncp_desegment, 8, get_ncp_pdu_len,
|
|
dissect_ncp_tcp_pdu);
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}
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void
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proto_register_ncp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_ncp_ip_sig,
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{ "NCP over IP signature", "ncp.ip.signature",
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FT_UINT32, BASE_HEX, VALS(ncp_ip_signature), 0x0,
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NULL, HFILL }},
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{ &hf_ncp_ip_length,
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{ "NCP over IP length", "ncp.ip.length",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_ip_ver,
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{ "NCP over IP Version", "ncp.ip.version",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_ip_rplybufsize,
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{ "NCP over IP Reply Buffer Size", "ncp.ip.replybufsize",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_ip_packetsig,
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{ "NCP over IP Packet Signature", "ncp.ip.packetsig",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_type,
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{ "Type", "ncp.type",
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FT_UINT16, BASE_HEX, VALS(ncp_type_vals), 0x0,
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"NCP message type", HFILL }},
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{ &hf_ncp_seq,
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{ "Sequence Number", "ncp.seq",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_connection,
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{ "Connection Number", "ncp.connection",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_task,
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{ "Task Number", "ncp.task",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_oplock_flag,
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{ "Broadcast Message Flag", "ncp.msg_flag",
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FT_UINT8, BASE_HEX, VALS(ncp_oplock_vals), 0x0,
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NULL, HFILL }},
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{ &hf_ncp_oplock_handle,
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{ "File Handle", "ncp.oplock_handle",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_stream_type,
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{ "Stream Type", "ncp.stream_type",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"Type of burst", HFILL }},
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{ &hf_ncp_system_flags,
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{ "System Flags", "ncp.system_flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_system_flags_abt,
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{ "ABT", "ncp.system_flags.abt",
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FT_BOOLEAN, 8, NULL, ABT,
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"Is this an abort request?", HFILL }},
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{ &hf_ncp_system_flags_eob,
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{ "EOB", "ncp.system_flags.eob",
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FT_BOOLEAN, 8, NULL, EOB,
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"Is this the last packet of the burst?", HFILL }},
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{ &hf_ncp_system_flags_sys,
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{ "SYS", "ncp.system_flags.sys",
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FT_BOOLEAN, 8, NULL, SYS,
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"Is this a system packet?", HFILL }},
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{ &hf_ncp_system_flags_bsy,
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{ "BSY", "ncp.system_flags.bsy",
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FT_BOOLEAN, 8, NULL, BSY,
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"Is the server busy?", HFILL }},
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{ &hf_ncp_system_flags_lst,
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{ "LST", "ncp.system_flags.lst",
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FT_BOOLEAN, 8, NULL, LST,
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"Return Fragment List?", HFILL }},
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{ &hf_ncp_src_connection,
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{ "Source Connection ID", "ncp.src_connection",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"The workstation's connection identification number", HFILL }},
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{ &hf_ncp_dst_connection,
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{ "Destination Connection ID", "ncp.dst_connection",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"The server's connection identification number", HFILL }},
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{ &hf_ncp_packet_seqno,
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{ "Packet Sequence Number", "ncp.packet_seqno",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Sequence number of this packet in a burst", HFILL }},
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{ &hf_ncp_delay_time,
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{ "Delay Time", "ncp.delay_time", /* in 100 us increments */
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Delay time between consecutive packet sends (100 us increments)", HFILL }},
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{ &hf_ncp_burst_seqno,
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{ "Burst Sequence Number", "ncp.burst_seqno",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Sequence number of this packet in the burst", HFILL }},
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{ &hf_ncp_ack_seqno,
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{ "ACK Sequence Number", "ncp.ack_seqno",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Next expected burst sequence number", HFILL }},
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{ &hf_ncp_burst_len,
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{ "Burst Length", "ncp.burst_len",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Total length of data in this burst", HFILL }},
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{ &hf_ncp_burst_offset,
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{ "Burst Offset", "ncp.burst_offset",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Offset of data in the burst", HFILL }},
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{ &hf_ncp_data_offset,
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{ "Data Offset", "ncp.data_offset",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Offset of this packet", HFILL }},
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{ &hf_ncp_data_bytes,
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{ "Data Bytes", "ncp.data_bytes",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Number of data bytes in this packet", HFILL }},
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{ &hf_ncp_missing_fraglist_count,
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{ "Missing Fragment List Count", "ncp.missing_fraglist_count",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Number of missing fragments reported", HFILL }},
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{ &hf_ncp_missing_data_offset,
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{ "Missing Data Offset", "ncp.missing_data_offset",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Offset of beginning of missing data", HFILL }},
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{ &hf_ncp_missing_data_count,
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{ "Missing Data Count", "ncp.missing_data_count",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Number of bytes of missing data", HFILL }},
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|
{ &hf_ncp_completion_code,
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|
{ "Completion Code", "ncp.completion_code",
|
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FT_UINT8, BASE_DEC, NULL, 0x0,
|
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NULL, HFILL }},
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|
{ &hf_ncp_connection_status,
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{ "Connection Status", "ncp.connection_status",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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|
{ &hf_ncp_slot,
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|
{ "Slot", "ncp.slot",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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|
{ &hf_ncp_control_code,
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|
{ "Control Code", "ncp.control_code",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_ncp_fragment_handle,
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{ "Fragment Handle", "ncp.fragger_hndl",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_lip_echo,
|
|
{ "Large Internet Packet Echo", "ncp.lip_echo",
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FT_STRING, BASE_NONE, NULL, 0x0,
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|
NULL, HFILL }},
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|
{ &hf_ncp_burst_command,
|
|
{ "Burst Command", "ncp.burst_command",
|
|
FT_UINT32, BASE_HEX, VALS(burst_command), 0x0,
|
|
"Packet Burst Command", HFILL }},
|
|
{ &hf_ncp_burst_file_handle,
|
|
{ "Burst File Handle", "ncp.file_handle",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"Packet Burst File Handle", HFILL }},
|
|
{ &hf_ncp_burst_reserved,
|
|
{ "Reserved", "ncp.burst_reserved",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_ncp,
|
|
&ett_ncp_system_flags,
|
|
&ett_nds,
|
|
&ett_nds_segments,
|
|
&ett_nds_segment,
|
|
};
|
|
module_t *ncp_module;
|
|
|
|
proto_ncp = proto_register_protocol("NetWare Core Protocol", "NCP", "ncp");
|
|
proto_register_field_array(proto_ncp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
ncp_module = prefs_register_protocol(proto_ncp, NULL);
|
|
prefs_register_obsolete_preference(ncp_module, "initial_hash_size");
|
|
prefs_register_bool_preference(ncp_module, "desegment",
|
|
"Reassemble NCP-over-TCP messages spanning multiple TCP segments",
|
|
"Whether the NCP dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&ncp_desegment);
|
|
prefs_register_bool_preference(ncp_module, "defragment_nds",
|
|
"Reassemble fragmented NDS messages spanning multiple reply packets",
|
|
"Whether the NCP dissector should defragment NDS messages spanning multiple reply packets.",
|
|
&nds_defragment);
|
|
prefs_register_bool_preference(ncp_module, "newstyle",
|
|
"Dissect New Netware Information Structure",
|
|
"Dissect the NetWare Information Structure as NetWare 5.x or higher or as older NetWare 3.x.",
|
|
&ncp_newstyle);
|
|
prefs_register_bool_preference(ncp_module, "eid_2_expert",
|
|
"Expert: EID to Name lookups?",
|
|
"Whether the NCP dissector should echo the NDS Entry ID to name resolves to the expert table.",
|
|
&nds_echo_eid);
|
|
prefs_register_bool_preference(ncp_module, "connection_2_expert",
|
|
"Expert: NCP Connections?",
|
|
"Whether the NCP dissector should echo NCP connection information to the expert table.",
|
|
&ncp_echo_conn);
|
|
prefs_register_bool_preference(ncp_module, "error_2_expert",
|
|
"Expert: NCP Errors?",
|
|
"Whether the NCP dissector should echo protocol errors to the expert table.",
|
|
&ncp_echo_err);
|
|
prefs_register_bool_preference(ncp_module, "server_2_expert",
|
|
"Expert: Server Information?",
|
|
"Whether the NCP dissector should echo server information to the expert table.",
|
|
&ncp_echo_server);
|
|
prefs_register_bool_preference(ncp_module, "file_2_expert",
|
|
"Expert: File Information?",
|
|
"Whether the NCP dissector should echo file open/close/oplock information to the expert table.",
|
|
&ncp_echo_file);
|
|
register_init_routine(&mncp_init_protocol);
|
|
ncp_tap.stat=register_tap("ncp_srt");
|
|
ncp_tap.hdr=register_tap("ncp_hdr");
|
|
register_postseq_cleanup_routine(&mncp_postseq_cleanup);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ncp(void)
|
|
{
|
|
dissector_handle_t ncp_handle;
|
|
dissector_handle_t ncp_tcp_handle;
|
|
|
|
ncp_handle = create_dissector_handle(dissect_ncp, proto_ncp);
|
|
ncp_tcp_handle = create_dissector_handle(dissect_ncp_tcp, proto_ncp);
|
|
dissector_add("tcp.port", TCP_PORT_NCP, ncp_tcp_handle);
|
|
dissector_add("udp.port", UDP_PORT_NCP, ncp_handle);
|
|
dissector_add("ipx.packet_type", IPX_PACKET_TYPE_NCP, ncp_handle);
|
|
dissector_add("ipx.socket", IPX_SOCKET_NCP, ncp_handle);
|
|
|
|
data_handle = find_dissector("data");
|
|
}
|