forked from osmocom/wireshark
1927 lines
54 KiB
C
1927 lines
54 KiB
C
/* packet-nbns.c
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* Routines for NetBIOS-over-TCP packet disassembly (the name dates back
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* to when it had only NBNS)
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* Guy Harris <guy@alum.mit.edu>
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*
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* $Id: packet-nbns.c,v 1.83 2004/02/24 09:40:38 sahlberg 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 <stdio.h>
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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 "packet-dns.h"
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#include "packet-netbios.h"
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#include "packet-tcp.h"
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#include "packet-frame.h"
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#include "prefs.h"
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static int proto_nbns = -1;
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static int hf_nbns_flags = -1;
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static int hf_nbns_flags_response = -1;
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static int hf_nbns_flags_opcode = -1;
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static int hf_nbns_flags_authoritative = -1;
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static int hf_nbns_flags_truncated = -1;
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static int hf_nbns_flags_recdesired = -1;
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static int hf_nbns_flags_recavail = -1;
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static int hf_nbns_flags_broadcast = -1;
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static int hf_nbns_flags_rcode = -1;
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static int hf_nbns_transaction_id = -1;
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static int hf_nbns_count_questions = -1;
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static int hf_nbns_count_answers = -1;
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static int hf_nbns_count_auth_rr = -1;
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static int hf_nbns_count_add_rr = -1;
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static gint ett_nbns = -1;
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static gint ett_nbns_qd = -1;
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static gint ett_nbns_flags = -1;
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static gint ett_nbns_nb_flags = -1;
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static gint ett_nbns_name_flags = -1;
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static gint ett_nbns_rr = -1;
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static gint ett_nbns_qry = -1;
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static gint ett_nbns_ans = -1;
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static int proto_nbdgm = -1;
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static int hf_nbdgm_type = -1;
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static int hf_nbdgm_fragment = -1;
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static int hf_nbdgm_first = -1;
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static int hf_nbdgm_node_type = -1;
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static int hf_nbdgm_datagram_id = -1;
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static int hf_nbdgm_src_ip = -1;
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static int hf_nbdgm_src_port = -1;
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static gint ett_nbdgm = -1;
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static int proto_nbss = -1;
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static int hf_nbss_type = -1;
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static int hf_nbss_flags = -1;
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static gint ett_nbss = -1;
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static gint ett_nbss_flags = -1;
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/* desegmentation of NBSS over TCP */
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static gboolean nbss_desegment = TRUE;
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/* See RFC 1001 and 1002 for information on the first three, and see
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http://www.cifs.com/specs/draft-leach-cifs-v1-spec-01.txt
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Appendix B, and various messages on the CIFS mailing list such as
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http://discuss.microsoft.com/SCRIPTS/WA-MSD.EXE?A2=ind9811A&L=cifs&P=R386
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for information on the fourth. */
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#define UDP_PORT_NBNS 137
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#define UDP_PORT_NBDGM 138
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#define TCP_PORT_NBSS 139
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#define TCP_PORT_CIFS 445
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/* Packet structure taken from RFC 1002. See also RFC 1001.
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* Opcode, flags, and rcode treated as "flags", similarly to DNS,
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* to make it easier to lift the dissection code from "packet-dns.c". */
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/* Offsets of fields in the NBNS header. */
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#define NBNS_ID 0
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#define NBNS_FLAGS 2
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#define NBNS_QUEST 4
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#define NBNS_ANS 6
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#define NBNS_AUTH 8
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#define NBNS_ADD 10
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/* Length of NBNS header. */
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#define NBNS_HDRLEN 12
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/* type values */
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#define T_NB 32 /* NetBIOS name service RR */
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#define T_NBSTAT 33 /* NetBIOS node status RR */
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/* Bit fields in the flags */
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#define F_RESPONSE (1<<15) /* packet is response */
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#define F_OPCODE (0xF<<11) /* query opcode */
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#define OPCODE_SHIFT 11
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#define F_AUTHORITATIVE (1<<10) /* response is authoritative */
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#define F_TRUNCATED (1<<9) /* response is truncated */
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#define F_RECDESIRED (1<<8) /* recursion desired */
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#define F_RECAVAIL (1<<7) /* recursion available */
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#define F_BROADCAST (1<<4) /* broadcast/multicast packet */
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#define F_RCODE (0xF<<0) /* reply code */
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static const true_false_string tfs_flags_response = {
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"Message is a response",
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"Message is a query"
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};
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static const true_false_string tfs_flags_authoritative = {
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"Server is an authority for domain",
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"Server is not an authority for domain"
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};
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static const true_false_string tfs_flags_truncated = {
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"Message is truncated",
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"Message is not truncated"
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};
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static const true_false_string tfs_flags_recdesired = {
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"Do query recursively",
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"Don't do query recursively"
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};
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static const true_false_string tfs_flags_recavail = {
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"Server can do recursive queries",
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"Server can't do recursive queries"
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};
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static const true_false_string tfs_flags_broadcast = {
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"Broadcast packet",
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"Not a broadcast packet"
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};
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/* Opcodes */
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#define OPCODE_QUERY 0 /* standard query */
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#define OPCODE_REGISTRATION 5 /* registration */
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#define OPCODE_RELEASE 6 /* release name */
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#define OPCODE_WACK 7 /* wait for acknowledgement */
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#define OPCODE_REFRESH 8 /* refresh registration */
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#define OPCODE_REFRESHALT 9 /* refresh registration (alternate opcode) */
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#define OPCODE_MHREGISTRATION 15 /* multi-homed registration */
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static const value_string opcode_vals[] = {
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{ OPCODE_QUERY, "Name query" },
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{ OPCODE_REGISTRATION, "Registration" },
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{ OPCODE_RELEASE, "Release" },
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{ OPCODE_WACK, "Wait for acknowledgment" },
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{ OPCODE_REFRESH, "Refresh" },
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{ OPCODE_REFRESHALT, "Refresh (alternate opcode)" },
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{ OPCODE_MHREGISTRATION, "Multi-homed registration" },
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{ 0, NULL }
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};
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/* Reply codes */
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#define RCODE_NOERROR 0
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#define RCODE_FMTERROR 1
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#define RCODE_SERVFAIL 2
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#define RCODE_NAMEERROR 3
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#define RCODE_NOTIMPL 4
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#define RCODE_REFUSED 5
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#define RCODE_ACTIVE 6
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#define RCODE_CONFLICT 7
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static const value_string rcode_vals[] = {
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{ RCODE_NOERROR, "No error" },
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{ RCODE_FMTERROR, "Request was invalidly formatted" },
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{ RCODE_SERVFAIL, "Server failure" },
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{ RCODE_NAMEERROR, "Requested name does not exist" },
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{ RCODE_NOTIMPL, "Request is not implemented" },
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{ RCODE_REFUSED, "Request was refused" },
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{ RCODE_ACTIVE, "Name is owned by another node" },
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{ RCODE_CONFLICT, "Name is in conflict" },
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{ 0, NULL }
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};
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/* Values for the "NB_FLAGS" field of RR data. From RFC 1001 and 1002,
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* except for NB_FLAGS_ONT_H_NODE, which was discovered by looking at
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* packet traces. */
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#define NB_FLAGS_ONT (3<<(15-2)) /* bits for node type */
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#define NB_FLAGS_ONT_B_NODE (0<<(15-2)) /* B-mode node */
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#define NB_FLAGS_ONT_P_NODE (1<<(15-2)) /* P-mode node */
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#define NB_FLAGS_ONT_M_NODE (2<<(15-2)) /* M-mode node */
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#define NB_FLAGS_ONT_H_NODE (3<<(15-2)) /* H-mode node */
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#define NB_FLAGS_G (1<<(15-0)) /* group name */
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/* Values for the "NAME_FLAGS" field of a NODE_NAME entry in T_NBSTAT
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* RR data. From RFC 1001 and 1002, except for NAME_FLAGS_ONT_H_NODE,
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* which was discovered by looking at packet traces. */
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#define NAME_FLAGS_PRM (1<<(15-6)) /* name is permanent node name */
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#define NAME_FLAGS_ACT (1<<(15-5)) /* name is active */
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#define NAME_FLAGS_CNF (1<<(15-4)) /* name is in conflict */
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#define NAME_FLAGS_DRG (1<<(15-3)) /* name is being deregistered */
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#define NAME_FLAGS_ONT (3<<(15-2)) /* bits for node type */
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#define NAME_FLAGS_ONT_B_NODE (0<<(15-2)) /* B-mode node */
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#define NAME_FLAGS_ONT_P_NODE (1<<(15-2)) /* P-mode node */
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#define NAME_FLAGS_ONT_M_NODE (2<<(15-2)) /* M-mode node */
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#define NAME_FLAGS_G (1<<(15-0)) /* group name */
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static char *
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nbns_type_name (int type)
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{
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switch (type) {
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case T_NB:
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return "NB";
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case T_NBSTAT:
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return "NBSTAT";
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}
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return "unknown";
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}
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#define NBNAME_BUF_LEN 128
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static int
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get_nbns_name(tvbuff_t *tvb, int offset, int nbns_data_offset,
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char *name_ret, int *name_type_ret)
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{
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int name_len;
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char name[MAXDNAME];
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char nbname[NBNAME_BUF_LEN];
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char *pname, *pnbname, cname, cnbname;
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int name_type;
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name_len = get_dns_name(tvb, offset, nbns_data_offset, name,
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sizeof(name));
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/* OK, now undo the first-level encoding. */
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pname = &name[0];
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pnbname = &nbname[0];
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for (;;) {
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/* Every two characters of the first level-encoded name
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* turn into one character in the decoded name. */
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cname = *pname;
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if (cname == '\0')
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break; /* no more characters */
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if (cname == '.')
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break; /* scope ID follows */
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if (cname < 'A' || cname > 'Z') {
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/* Not legal. */
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strcpy(nbname,
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"Illegal NetBIOS name (character not between A and Z in first-level encoding)");
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goto bad;
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}
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cname -= 'A';
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cnbname = cname << 4;
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pname++;
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cname = *pname;
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if (cname == '\0' || cname == '.') {
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/* No more characters in the name - but we're in
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* the middle of a pair. Not legal. */
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strcpy(nbname,
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"Illegal NetBIOS name (odd number of bytes)");
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goto bad;
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}
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if (cname < 'A' || cname > 'Z') {
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/* Not legal. */
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strcpy(nbname,
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"Illegal NetBIOS name (character not between A and Z in first-level encoding)");
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goto bad;
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}
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cname -= 'A';
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cnbname |= cname;
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pname++;
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/* Do we have room to store the character? */
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if (pnbname < &nbname[NETBIOS_NAME_LEN]) {
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/* Yes - store the character. */
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*pnbname = cnbname;
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}
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/* We bump the pointer even if it's past the end of the
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name, so we keep track of how long the name is. */
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pnbname++;
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}
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/* NetBIOS names are supposed to be exactly 16 bytes long. */
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if (pnbname - nbname != NETBIOS_NAME_LEN) {
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/* It's not. */
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sprintf(nbname, "Illegal NetBIOS name (%ld bytes long)",
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(long)(pnbname - nbname));
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goto bad;
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}
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/* This one is; make its name printable. */
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name_type = process_netbios_name(nbname, name_ret);
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name_ret += strlen(name_ret);
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sprintf(name_ret, "<%02x>", name_type);
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name_ret += 4;
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if (cname == '.') {
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/* We have a scope ID, starting at "pname"; append that to
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* the decoded host name. */
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strcpy(name_ret, pname);
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}
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if (name_type_ret != NULL)
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*name_type_ret = name_type;
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return name_len;
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bad:
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if (name_type_ret != NULL)
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*name_type_ret = -1;
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strcpy (name_ret, nbname);
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return name_len;
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}
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static int
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get_nbns_name_type_class(tvbuff_t *tvb, int offset, int nbns_data_offset,
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char *name_ret, int *name_len_ret, int *name_type_ret, int *type_ret,
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int *class_ret)
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{
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int name_len;
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int type;
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int class;
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name_len = get_nbns_name(tvb, offset, nbns_data_offset, name_ret,
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name_type_ret);
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offset += name_len;
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type = tvb_get_ntohs(tvb, offset);
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offset += 2;
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class = tvb_get_ntohs(tvb, offset);
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*type_ret = type;
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*class_ret = class;
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*name_len_ret = name_len;
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return name_len + 4;
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}
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static void
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add_name_and_type(proto_tree *tree, tvbuff_t *tvb, int offset, int len,
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char *tag, char *name, int name_type)
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{
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if (name_type != -1) {
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proto_tree_add_text(tree, tvb, offset, len, "%s: %s (%s)",
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tag, name, netbios_name_type_descr(name_type));
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} else {
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proto_tree_add_text(tree, tvb, offset, len, "%s: %s",
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tag, name);
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}
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}
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static int
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dissect_nbns_query(tvbuff_t *tvb, int offset, int nbns_data_offset,
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column_info *cinfo, proto_tree *nbns_tree)
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{
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int len;
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char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME];
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int name_len;
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int name_type;
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int type;
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int class;
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char *class_name;
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char *type_name;
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int data_offset;
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int data_start;
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proto_tree *q_tree;
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proto_item *tq;
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data_start = data_offset = offset;
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len = get_nbns_name_type_class(tvb, offset, nbns_data_offset, name,
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&name_len, &name_type, &type, &class);
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data_offset += len;
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type_name = nbns_type_name(type);
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class_name = dns_class_name(class);
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if (cinfo != NULL)
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col_append_fstr(cinfo, COL_INFO, " %s %s", type_name, name);
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if (nbns_tree != NULL) {
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tq = proto_tree_add_text(nbns_tree, tvb, offset, len,
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"%s: type %s, class %s", name, type_name, class_name);
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q_tree = proto_item_add_subtree(tq, ett_nbns_qd);
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add_name_and_type(q_tree, tvb, offset, name_len, "Name", name,
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name_type);
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offset += name_len;
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proto_tree_add_text(q_tree, tvb, offset, 2, "Type: %s", type_name);
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offset += 2;
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proto_tree_add_text(q_tree, tvb, offset, 2, "Class: %s", class_name);
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offset += 2;
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}
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return data_offset - data_start;
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}
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|
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static void
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nbns_add_nbns_flags(column_info *cinfo, proto_tree *nbns_tree, tvbuff_t *tvb, int offset,
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gushort flags, int is_wack)
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{
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char buf[128+1];
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guint16 opcode;
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proto_tree *field_tree;
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proto_item *tf;
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opcode = (guint16) ((flags & F_OPCODE) >> OPCODE_SHIFT);
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strcpy(buf, val_to_str(opcode, opcode_vals, "Unknown operation"));
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if (flags & F_RESPONSE && !is_wack) {
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strcat(buf, " response");
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strcat(buf, ", ");
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strcat(buf, val_to_str(flags & F_RCODE, rcode_vals,
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"Unknown error"));
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if ((flags & F_RCODE) && check_col(cinfo, COL_INFO))
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col_append_fstr(cinfo, COL_INFO, ", %s",
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val_to_str(flags & F_RCODE, rcode_vals,
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"Unknown error"));
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}
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tf = proto_tree_add_uint_format(nbns_tree, hf_nbns_flags,
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tvb, offset, 2, flags, "Flags: 0x%04x (%s)", flags, buf);
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field_tree = proto_item_add_subtree(tf, ett_nbns_flags);
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proto_tree_add_item(field_tree, hf_nbns_flags_response,
|
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tvb, offset, 2, FALSE);
|
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proto_tree_add_item(field_tree, hf_nbns_flags_opcode,
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tvb, offset, 2, FALSE);
|
|
if (flags & F_RESPONSE) {
|
|
proto_tree_add_item(field_tree, hf_nbns_flags_authoritative,
|
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tvb, offset, 2, FALSE);
|
|
}
|
|
proto_tree_add_item(field_tree, hf_nbns_flags_truncated,
|
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tvb, offset, 2, FALSE);
|
|
proto_tree_add_item(field_tree, hf_nbns_flags_recdesired,
|
|
tvb, offset, 2, FALSE);
|
|
if (flags & F_RESPONSE) {
|
|
proto_tree_add_item(field_tree, hf_nbns_flags_recavail,
|
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tvb, offset, 2, FALSE);
|
|
}
|
|
proto_tree_add_item(field_tree, hf_nbns_flags_broadcast,
|
|
tvb, offset, 2, FALSE);
|
|
if (flags & F_RESPONSE && !is_wack) {
|
|
proto_tree_add_item(field_tree, hf_nbns_flags_rcode,
|
|
tvb, offset, 2, FALSE);
|
|
}
|
|
}
|
|
|
|
static void
|
|
nbns_add_nb_flags(proto_tree *rr_tree, tvbuff_t *tvb, int offset, gushort flags)
|
|
{
|
|
char buf[128+1];
|
|
proto_tree *field_tree;
|
|
proto_item *tf;
|
|
static const value_string nb_flags_ont_vals[] = {
|
|
{ NB_FLAGS_ONT_B_NODE, "B-node" },
|
|
{ NB_FLAGS_ONT_P_NODE, "P-node" },
|
|
{ NB_FLAGS_ONT_M_NODE, "M-node" },
|
|
{ NB_FLAGS_ONT_H_NODE, "H-node" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
strcpy(buf, val_to_str(flags & NB_FLAGS_ONT, nb_flags_ont_vals,
|
|
"Unknown"));
|
|
strcat(buf, ", ");
|
|
if (flags & NB_FLAGS_G)
|
|
strcat(buf, "group");
|
|
else
|
|
strcat(buf, "unique");
|
|
tf = proto_tree_add_text(rr_tree, tvb, offset, 2, "Flags: 0x%x (%s)", flags,
|
|
buf);
|
|
field_tree = proto_item_add_subtree(tf, ett_nbns_nb_flags);
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, NB_FLAGS_G,
|
|
2*8,
|
|
"Group name",
|
|
"Unique name"));
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_enumerated_bitfield(flags, NB_FLAGS_ONT,
|
|
2*8, nb_flags_ont_vals, "%s"));
|
|
}
|
|
|
|
static void
|
|
nbns_add_name_flags(proto_tree *rr_tree, tvbuff_t *tvb, int offset,
|
|
gushort flags)
|
|
{
|
|
char buf[128+1];
|
|
proto_item *field_tree;
|
|
proto_item *tf;
|
|
static const value_string name_flags_ont_vals[] = {
|
|
{ NAME_FLAGS_ONT_B_NODE, "B-node" },
|
|
{ NAME_FLAGS_ONT_P_NODE, "P-node" },
|
|
{ NAME_FLAGS_ONT_M_NODE, "M-node" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
strcpy(buf, val_to_str(flags & NAME_FLAGS_ONT, name_flags_ont_vals,
|
|
"Unknown"));
|
|
strcat(buf, ", ");
|
|
if (flags & NAME_FLAGS_G)
|
|
strcat(buf, "group");
|
|
else
|
|
strcat(buf, "unique");
|
|
if (flags & NAME_FLAGS_DRG)
|
|
strcat(buf, ", being deregistered");
|
|
if (flags & NAME_FLAGS_CNF)
|
|
strcat(buf, ", in conflict");
|
|
if (flags & NAME_FLAGS_ACT)
|
|
strcat(buf, ", active");
|
|
if (flags & NAME_FLAGS_PRM)
|
|
strcat(buf, ", permanent node name");
|
|
tf = proto_tree_add_text(rr_tree, tvb, offset, 2, "Name flags: 0x%x (%s)",
|
|
flags, buf);
|
|
field_tree = proto_item_add_subtree(tf, ett_nbns_name_flags);
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, NAME_FLAGS_G,
|
|
2*8,
|
|
"Group name",
|
|
"Unique name"));
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_enumerated_bitfield(flags, NAME_FLAGS_ONT,
|
|
2*8, name_flags_ont_vals, "%s"));
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, NAME_FLAGS_DRG,
|
|
2*8,
|
|
"Name is being deregistered",
|
|
"Name is not being deregistered"));
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, NAME_FLAGS_CNF,
|
|
2*8,
|
|
"Name is in conflict",
|
|
"Name is not in conflict"));
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, NAME_FLAGS_ACT,
|
|
2*8,
|
|
"Name is active",
|
|
"Name is not active"));
|
|
proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
|
|
decode_boolean_bitfield(flags, NAME_FLAGS_PRM,
|
|
2*8,
|
|
"Permanent node name",
|
|
"Not permanent node name"));
|
|
}
|
|
|
|
static int
|
|
dissect_nbns_answer(tvbuff_t *tvb, int offset, int nbns_data_offset,
|
|
column_info *cinfo, proto_tree *nbns_tree, int opcode)
|
|
{
|
|
int len;
|
|
char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME + 64];
|
|
int name_len;
|
|
int name_type;
|
|
int type;
|
|
int class;
|
|
char *class_name;
|
|
char *type_name;
|
|
int data_offset;
|
|
int cur_offset;
|
|
int data_start;
|
|
guint ttl;
|
|
gushort data_len;
|
|
gushort flags;
|
|
proto_tree *rr_tree;
|
|
proto_item *trr;
|
|
char name_str[(NETBIOS_NAME_LEN - 1)*4 + 1];
|
|
guint num_names;
|
|
char nbname[16+4+1]; /* 4 for [<last char>] */
|
|
gushort name_flags;
|
|
|
|
data_start = data_offset = offset;
|
|
cur_offset = offset;
|
|
|
|
len = get_nbns_name_type_class(tvb, offset, nbns_data_offset, name,
|
|
&name_len, &name_type, &type, &class);
|
|
data_offset += len;
|
|
cur_offset += len;
|
|
|
|
type_name = nbns_type_name(type);
|
|
class_name = dns_class_name(class);
|
|
|
|
ttl = tvb_get_ntohl(tvb, data_offset);
|
|
data_offset += 4;
|
|
cur_offset += 4;
|
|
|
|
data_len = tvb_get_ntohs(tvb, data_offset);
|
|
data_offset += 2;
|
|
cur_offset += 2;
|
|
|
|
switch (type) {
|
|
case T_NB: /* "NB" record */
|
|
if (cinfo != NULL) {
|
|
if (opcode != OPCODE_WACK) {
|
|
col_append_fstr(cinfo, COL_INFO, " %s %s",
|
|
type_name,
|
|
ip_to_str(tvb_get_ptr(tvb, data_offset+2, 4)));
|
|
}
|
|
}
|
|
if (nbns_tree == NULL)
|
|
break;
|
|
trr = proto_tree_add_text(nbns_tree, tvb, offset,
|
|
(data_offset - data_start) + data_len,
|
|
"%s: type %s, class %s",
|
|
name, type_name, class_name);
|
|
strcat(name, " (");
|
|
strcat(name, netbios_name_type_descr(name_type));
|
|
strcat(name, ")");
|
|
rr_tree = add_rr_to_tree(trr, ett_nbns_rr, tvb, offset, name,
|
|
name_len, type_name, class_name, ttl, data_len);
|
|
while (data_len > 0) {
|
|
if (opcode == OPCODE_WACK) {
|
|
/* WACK response. This doesn't contain the
|
|
* same type of RR data as other T_NB
|
|
* responses. */
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
flags = tvb_get_ntohs(tvb, cur_offset);
|
|
nbns_add_nbns_flags(cinfo, rr_tree, tvb, cur_offset,
|
|
flags, 1);
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
} else {
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
flags = tvb_get_ntohs(tvb, cur_offset);
|
|
nbns_add_nb_flags(rr_tree, tvb, cur_offset,
|
|
flags);
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 4) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 4,
|
|
"Addr: %s",
|
|
ip_to_str(tvb_get_ptr(tvb, cur_offset, 4)));
|
|
cur_offset += 4;
|
|
data_len -= 4;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case T_NBSTAT: /* "NBSTAT" record */
|
|
if (cinfo != NULL)
|
|
col_append_fstr(cinfo, COL_INFO, " %s", type_name);
|
|
if (nbns_tree == NULL)
|
|
break;
|
|
trr = proto_tree_add_text(nbns_tree, tvb, offset,
|
|
(data_offset - data_start) + data_len,
|
|
"%s: type %s, class %s",
|
|
name, type_name, class_name);
|
|
rr_tree = add_rr_to_tree(trr, ett_nbns_rr, tvb, offset, name,
|
|
name_len, type_name, class_name, ttl, data_len);
|
|
if (data_len < 1) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
num_names = tvb_get_guint8(tvb, cur_offset);
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 1,
|
|
"Number of names: %u", num_names);
|
|
cur_offset += 1;
|
|
|
|
while (num_names != 0) {
|
|
if (data_len < NETBIOS_NAME_LEN) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
goto out;
|
|
}
|
|
tvb_memcpy(tvb, (guint8 *)nbname, cur_offset,
|
|
NETBIOS_NAME_LEN);
|
|
name_type = process_netbios_name(nbname,
|
|
name_str);
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
NETBIOS_NAME_LEN, "Name: %s<%02x> (%s)",
|
|
name_str, name_type,
|
|
netbios_name_type_descr(name_type));
|
|
cur_offset += NETBIOS_NAME_LEN;
|
|
data_len -= NETBIOS_NAME_LEN;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
goto out;
|
|
}
|
|
name_flags = tvb_get_ntohs(tvb, cur_offset);
|
|
nbns_add_name_flags(rr_tree, tvb, cur_offset,
|
|
name_flags);
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
num_names--;
|
|
}
|
|
|
|
if (data_len < 6) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 6,
|
|
"Unit ID: %s",
|
|
ether_to_str(tvb_get_ptr(tvb, cur_offset, 6)));
|
|
cur_offset += 6;
|
|
data_len -= 6;
|
|
|
|
if (data_len < 1) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 1,
|
|
"Jumpers: 0x%x", tvb_get_guint8(tvb, cur_offset));
|
|
cur_offset += 1;
|
|
data_len -= 1;
|
|
|
|
if (data_len < 1) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 1,
|
|
"Test result: 0x%x", tvb_get_guint8(tvb, cur_offset));
|
|
cur_offset += 1;
|
|
data_len -= 1;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Version number: 0x%x", tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Period of statistics: 0x%x",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of CRCs: %u", tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of alignment errors: %u",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of collisions: %u", tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of send aborts: %u", tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 4) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 4,
|
|
"Number of good sends: %u", tvb_get_ntohl(tvb, cur_offset));
|
|
cur_offset += 4;
|
|
data_len -= 4;
|
|
|
|
if (data_len < 4) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 4,
|
|
"Number of good receives: %u",
|
|
tvb_get_ntohl(tvb, cur_offset));
|
|
cur_offset += 4;
|
|
data_len -= 4;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of retransmits: %u", tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of no resource conditions: %u",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of command blocks: %u",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Number of pending sessions: %u",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Max number of pending sessions: %u",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Max total sessions possible: %u",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
|
|
if (data_len < 2) {
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset,
|
|
data_len, "(incomplete entry)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
|
|
"Session data packet size: %u",
|
|
tvb_get_ntohs(tvb, cur_offset));
|
|
cur_offset += 2;
|
|
data_len -= 2;
|
|
out:
|
|
break;
|
|
|
|
default:
|
|
if (cinfo != NULL)
|
|
col_append_fstr(cinfo, COL_INFO, " %s", type_name);
|
|
if (nbns_tree == NULL)
|
|
break;
|
|
trr = proto_tree_add_text(nbns_tree, tvb, offset,
|
|
(data_offset - data_start) + data_len,
|
|
"%s: type %s, class %s",
|
|
name, type_name, class_name);
|
|
rr_tree = add_rr_to_tree(trr, ett_nbns_rr, tvb, offset, name,
|
|
name_len, type_name, class_name, ttl, data_len);
|
|
proto_tree_add_text(rr_tree, tvb, cur_offset, data_len, "Data");
|
|
cur_offset += data_len;
|
|
break;
|
|
}
|
|
|
|
return cur_offset - data_start;
|
|
}
|
|
|
|
static int
|
|
dissect_query_records(tvbuff_t *tvb, int cur_off, int nbns_data_offset,
|
|
int count, column_info *cinfo, proto_tree *nbns_tree)
|
|
{
|
|
int start_off, add_off;
|
|
proto_tree *qatree = NULL;
|
|
proto_item *ti = NULL;
|
|
|
|
start_off = cur_off;
|
|
if (nbns_tree != NULL) {
|
|
ti = proto_tree_add_text(nbns_tree, tvb, start_off, -1, "Queries");
|
|
qatree = proto_item_add_subtree(ti, ett_nbns_qry);
|
|
}
|
|
while (count-- > 0) {
|
|
add_off = dissect_nbns_query(tvb, cur_off, nbns_data_offset,
|
|
cinfo, qatree);
|
|
cur_off += add_off;
|
|
}
|
|
if (ti != NULL)
|
|
proto_item_set_len(ti, cur_off - start_off);
|
|
|
|
return cur_off - start_off;
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
dissect_answer_records(tvbuff_t *tvb, int cur_off, int nbns_data_offset,
|
|
int count, column_info *cinfo, proto_tree *nbns_tree, int opcode,
|
|
char *name)
|
|
{
|
|
int start_off, add_off;
|
|
proto_tree *qatree = NULL;
|
|
proto_item *ti = NULL;
|
|
|
|
start_off = cur_off;
|
|
if (nbns_tree != NULL) {
|
|
ti = proto_tree_add_text(nbns_tree, tvb, start_off, -1, name);
|
|
qatree = proto_item_add_subtree(ti, ett_nbns_ans);
|
|
}
|
|
while (count-- > 0) {
|
|
add_off = dissect_nbns_answer(tvb, cur_off, nbns_data_offset,
|
|
cinfo, qatree, opcode);
|
|
cur_off += add_off;
|
|
}
|
|
if (ti != NULL)
|
|
proto_item_set_len(ti, cur_off - start_off);
|
|
return cur_off - start_off;
|
|
}
|
|
|
|
static void
|
|
dissect_nbns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int offset = 0;
|
|
int nbns_data_offset;
|
|
column_info *cinfo;
|
|
proto_tree *nbns_tree = NULL;
|
|
proto_item *ti;
|
|
guint16 id, flags, opcode, rcode, quest, ans, auth, add;
|
|
int cur_off;
|
|
|
|
nbns_data_offset = offset;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NBNS");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
/* To do: check for runts, errs, etc. */
|
|
id = tvb_get_ntohs(tvb, offset + NBNS_ID);
|
|
flags = tvb_get_ntohs(tvb, offset + NBNS_FLAGS);
|
|
opcode = (guint16) ((flags & F_OPCODE) >> OPCODE_SHIFT);
|
|
rcode = (guint16) (flags & F_RCODE);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s%s",
|
|
val_to_str(opcode, opcode_vals, "Unknown operation (%u)"),
|
|
(flags & F_RESPONSE) ? " response" : "");
|
|
cinfo = pinfo->cinfo;
|
|
} else {
|
|
/* Set "cinfo" to NULL; we pass a NULL "cinfo" to the query
|
|
and answer dissectors, as a way of saying that they
|
|
shouldn't add stuff to the COL_INFO column (a call to
|
|
"check_col(cinfo, COL_INFO)" is more expensive than
|
|
a check that a pointer isn't NULL). */
|
|
cinfo = NULL;
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_nbns, tvb, offset, -1,
|
|
FALSE);
|
|
nbns_tree = proto_item_add_subtree(ti, ett_nbns);
|
|
|
|
proto_tree_add_uint(nbns_tree, hf_nbns_transaction_id, tvb,
|
|
offset + NBNS_ID, 2, id);
|
|
|
|
nbns_add_nbns_flags(pinfo->cinfo, nbns_tree, tvb, offset + NBNS_FLAGS,
|
|
flags, 0);
|
|
}
|
|
quest = tvb_get_ntohs(tvb, offset + NBNS_QUEST);
|
|
if (tree) {
|
|
proto_tree_add_uint(nbns_tree, hf_nbns_count_questions, tvb,
|
|
offset + NBNS_QUEST, 2, quest);
|
|
}
|
|
ans = tvb_get_ntohs(tvb, offset + NBNS_ANS);
|
|
if (tree) {
|
|
proto_tree_add_uint(nbns_tree, hf_nbns_count_answers, tvb,
|
|
offset + NBNS_ANS, 2, ans);
|
|
}
|
|
auth = tvb_get_ntohs(tvb, offset + NBNS_AUTH);
|
|
if (tree) {
|
|
proto_tree_add_uint(nbns_tree, hf_nbns_count_auth_rr, tvb,
|
|
offset + NBNS_AUTH, 2, auth);
|
|
}
|
|
add = tvb_get_ntohs(tvb, offset + NBNS_ADD);
|
|
if (tree) {
|
|
proto_tree_add_uint(nbns_tree, hf_nbns_count_add_rr, tvb,
|
|
offset + NBNS_ADD, 2, add);
|
|
}
|
|
|
|
cur_off = offset + NBNS_HDRLEN;
|
|
|
|
if (quest > 0) {
|
|
/* If this is a response, don't add information about the
|
|
queries to the summary, just add information about the
|
|
answers. */
|
|
cur_off += dissect_query_records(tvb, cur_off,
|
|
nbns_data_offset, quest,
|
|
(!(flags & F_RESPONSE) ? cinfo : NULL), nbns_tree);
|
|
}
|
|
|
|
if (ans > 0) {
|
|
/* If this is a request, don't add information about the
|
|
answers to the summary, just add information about the
|
|
queries. */
|
|
cur_off += dissect_answer_records(tvb, cur_off,
|
|
nbns_data_offset, ans,
|
|
((flags & F_RESPONSE) ? cinfo : NULL), nbns_tree,
|
|
opcode, "Answers");
|
|
}
|
|
|
|
if (tree) {
|
|
/* Don't add information about the authoritative name
|
|
servers, or the additional records, to the summary. */
|
|
if (auth > 0)
|
|
cur_off += dissect_answer_records(tvb, cur_off,
|
|
nbns_data_offset,
|
|
auth, NULL, nbns_tree, opcode,
|
|
"Authoritative nameservers");
|
|
|
|
if (add > 0)
|
|
cur_off += dissect_answer_records(tvb, cur_off,
|
|
nbns_data_offset,
|
|
add, NULL, nbns_tree, opcode,
|
|
"Additional records");
|
|
}
|
|
}
|
|
|
|
/* NetBIOS datagram packet, from RFC 1002, page 32 */
|
|
struct nbdgm_header {
|
|
guint8 msg_type;
|
|
struct {
|
|
guint8 more;
|
|
guint8 first;
|
|
guint8 node_type;
|
|
} flags;
|
|
guint16 dgm_id;
|
|
guint32 src_ip;
|
|
guint16 src_port;
|
|
|
|
/* For packets with data */
|
|
guint16 dgm_length;
|
|
guint16 pkt_offset;
|
|
|
|
/* For error packets */
|
|
guint8 error_code;
|
|
};
|
|
|
|
/*
|
|
* NBDS message types.
|
|
*/
|
|
#define NBDS_DIRECT_UNIQUE 0x10
|
|
#define NBDS_DIRECT_GROUP 0x11
|
|
#define NBDS_BROADCAST 0x12
|
|
#define NBDS_ERROR 0x13
|
|
#define NBDS_QUERY_REQUEST 0x14
|
|
#define NBDS_POS_QUERY_RESPONSE 0x15
|
|
#define NBDS_NEG_QUERY_RESPONSE 0x16
|
|
|
|
static const value_string nbds_msgtype_vals[] = {
|
|
{ NBDS_DIRECT_UNIQUE, "Direct_unique datagram" },
|
|
{ NBDS_DIRECT_GROUP, "Direct_group datagram" },
|
|
{ NBDS_BROADCAST, "Broadcast datagram" },
|
|
{ NBDS_ERROR, "Datagram error" },
|
|
{ NBDS_QUERY_REQUEST, "Datagram query request" },
|
|
{ NBDS_POS_QUERY_RESPONSE, "Datagram positive query response" },
|
|
{ NBDS_NEG_QUERY_RESPONSE, "Datagram negative query response" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const true_false_string yesno = {
|
|
"Yes",
|
|
"No"
|
|
};
|
|
|
|
static const value_string node_type_vals[] = {
|
|
{ 0, "B node" },
|
|
{ 1, "P node" },
|
|
{ 2, "M node" },
|
|
{ 3, "NBDD" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_nbdgm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int offset = 0;
|
|
proto_tree *nbdgm_tree = NULL;
|
|
proto_item *ti = NULL;
|
|
struct nbdgm_header header;
|
|
int flags;
|
|
int message_index;
|
|
tvbuff_t *next_tvb;
|
|
|
|
static const value_string error_codes[] = {
|
|
{ 0x82, "Destination name not present" },
|
|
{ 0x83, "Invalid source name format" },
|
|
{ 0x84, "Invalid destination name format" },
|
|
{ 0x00, NULL }
|
|
};
|
|
|
|
char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME];
|
|
int name_type;
|
|
int len;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NBDS");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
header.msg_type = tvb_get_guint8(tvb, offset);
|
|
|
|
flags = tvb_get_guint8(tvb, offset+1);
|
|
header.flags.more = flags & 1;
|
|
header.flags.first = (flags & 2) >> 1;
|
|
header.flags.node_type = (flags & 12) >> 2;
|
|
|
|
header.dgm_id = tvb_get_ntohs(tvb, offset+2);
|
|
tvb_memcpy(tvb, (guint8 *)&header.src_ip, offset+4, 4);
|
|
header.src_port = tvb_get_ntohs(tvb, offset+8);
|
|
|
|
switch (header.msg_type) {
|
|
|
|
case NBDS_DIRECT_UNIQUE:
|
|
case NBDS_DIRECT_GROUP:
|
|
case NBDS_BROADCAST:
|
|
header.dgm_length = tvb_get_ntohs(tvb, offset+10);
|
|
header.pkt_offset = tvb_get_ntohs(tvb, offset+12);
|
|
break;
|
|
|
|
case NBDS_ERROR:
|
|
header.error_code = tvb_get_guint8(tvb, offset+10);
|
|
break;
|
|
}
|
|
|
|
message_index = header.msg_type - 0x0f;
|
|
if (message_index < 1 || message_index > 8) {
|
|
message_index = 0;
|
|
}
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(header.msg_type, nbds_msgtype_vals,
|
|
"Unknown message type (0x%02X)"));
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_nbdgm, tvb, offset, -1,
|
|
FALSE);
|
|
nbdgm_tree = proto_item_add_subtree(ti, ett_nbdgm);
|
|
|
|
proto_tree_add_uint(nbdgm_tree, hf_nbdgm_type, tvb,
|
|
offset, 1,
|
|
header.msg_type);
|
|
proto_tree_add_boolean(nbdgm_tree, hf_nbdgm_fragment, tvb,
|
|
offset+1, 1,
|
|
header.flags.more);
|
|
proto_tree_add_boolean(nbdgm_tree, hf_nbdgm_first, tvb,
|
|
offset+1, 1,
|
|
header.flags.first);
|
|
proto_tree_add_uint(nbdgm_tree, hf_nbdgm_node_type, tvb,
|
|
offset+1, 1,
|
|
header.flags.node_type);
|
|
|
|
proto_tree_add_uint(nbdgm_tree, hf_nbdgm_datagram_id, tvb,
|
|
offset+2, 2, header.dgm_id);
|
|
proto_tree_add_ipv4(nbdgm_tree, hf_nbdgm_src_ip, tvb,
|
|
offset+4, 4, header.src_ip);
|
|
proto_tree_add_uint(nbdgm_tree, hf_nbdgm_src_port, tvb,
|
|
offset+8, 2, header.src_port);
|
|
|
|
}
|
|
|
|
offset += 10;
|
|
|
|
switch (header.msg_type) {
|
|
|
|
case NBDS_DIRECT_UNIQUE:
|
|
case NBDS_DIRECT_GROUP:
|
|
case NBDS_BROADCAST:
|
|
if (tree) {
|
|
proto_tree_add_text(nbdgm_tree, tvb, offset, 2,
|
|
"Datagram length: %d bytes", header.dgm_length);
|
|
proto_tree_add_text(nbdgm_tree, tvb, offset+2, 2,
|
|
"Packet offset: %d bytes", header.pkt_offset);
|
|
}
|
|
|
|
offset += 4;
|
|
|
|
/* Source name */
|
|
len = get_nbns_name(tvb, offset, offset, name, &name_type);
|
|
|
|
if (tree) {
|
|
add_name_and_type(nbdgm_tree, tvb, offset, len,
|
|
"Source name", name, name_type);
|
|
}
|
|
offset += len;
|
|
|
|
/* Destination name */
|
|
len = get_nbns_name(tvb, offset, offset, name, &name_type);
|
|
|
|
if (tree) {
|
|
add_name_and_type(nbdgm_tree, tvb, offset, len,
|
|
"Destination name", name, name_type);
|
|
}
|
|
offset += len;
|
|
|
|
/*
|
|
* Here we can pass the packet off to the next protocol.
|
|
* Set the length of our top-level tree item to include
|
|
* only our stuff.
|
|
*
|
|
* XXX - take the datagram length into account?
|
|
*/
|
|
proto_item_set_len(ti, offset);
|
|
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
dissect_netbios_payload(next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case NBDS_ERROR:
|
|
if (tree) {
|
|
proto_tree_add_text(nbdgm_tree, tvb, offset, 1, "Error code: %s",
|
|
val_to_str(header.error_code, error_codes, "Unknown (0x%x)"));
|
|
}
|
|
offset += 1;
|
|
proto_item_set_len(ti, offset);
|
|
break;
|
|
|
|
case NBDS_QUERY_REQUEST:
|
|
case NBDS_POS_QUERY_RESPONSE:
|
|
case NBDS_NEG_QUERY_RESPONSE:
|
|
/* Destination name */
|
|
len = get_nbns_name(tvb, offset, offset, name, &name_type);
|
|
|
|
if (tree) {
|
|
add_name_and_type(nbdgm_tree, tvb, offset, len,
|
|
"Destination name", name, name_type);
|
|
}
|
|
offset += len;
|
|
proto_item_set_len(ti, offset);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* NetBIOS Session Service message types.
|
|
*/
|
|
#define SESSION_MESSAGE 0x00
|
|
#define SESSION_REQUEST 0x81
|
|
#define POSITIVE_SESSION_RESPONSE 0x82
|
|
#define NEGATIVE_SESSION_RESPONSE 0x83
|
|
#define RETARGET_SESSION_RESPONSE 0x84
|
|
#define SESSION_KEEP_ALIVE 0x85
|
|
|
|
static const value_string message_types[] = {
|
|
{ SESSION_MESSAGE, "Session message" },
|
|
{ SESSION_REQUEST, "Session request" },
|
|
{ POSITIVE_SESSION_RESPONSE, "Positive session response" },
|
|
{ NEGATIVE_SESSION_RESPONSE, "Negative session response" },
|
|
{ RETARGET_SESSION_RESPONSE, "Retarget session response" },
|
|
{ SESSION_KEEP_ALIVE, "Session keep-alive" },
|
|
{ 0x0, NULL }
|
|
};
|
|
|
|
/*
|
|
* NetBIOS Session Service flags.
|
|
*/
|
|
#define NBSS_FLAGS_E 0x1
|
|
|
|
static const value_string error_codes[] = {
|
|
{ 0x80, "Not listening on called name" },
|
|
{ 0x81, "Not listening for called name" },
|
|
{ 0x82, "Called name not present" },
|
|
{ 0x83, "Called name present, but insufficient resources" },
|
|
{ 0x8F, "Unspecified error" },
|
|
{ 0x0, NULL }
|
|
};
|
|
|
|
/*
|
|
* Dissect a single NBSS packet (there may be more than one in a given
|
|
* TCP segment).
|
|
*
|
|
* [ Hmmm, in my experience, I have never seen more than one NBSS in a
|
|
* single segment, since they mostly contain SMBs which are essentially
|
|
* a request response type protocol (RJS). ]
|
|
*
|
|
* [ However, under heavy load with many requests multiplexed on one
|
|
* session it is not unusual to see multiple requests in one TCP
|
|
* segment. Unfortunately, in this case a single session message is
|
|
* frequently split over multiple segments, which frustrates decoding
|
|
* (MMM). ]
|
|
*/
|
|
static int
|
|
dissect_nbss_packet(tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, int is_cifs)
|
|
{
|
|
proto_tree *nbss_tree = NULL;
|
|
proto_item *ti = NULL;
|
|
proto_tree *field_tree;
|
|
proto_item *tf;
|
|
guint8 msg_type;
|
|
guint8 flags;
|
|
volatile int length;
|
|
int length_remaining;
|
|
int len;
|
|
char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME];
|
|
int name_type;
|
|
gint reported_len;
|
|
tvbuff_t *next_tvb;
|
|
const char *saved_proto;
|
|
|
|
/* Desegmentation */
|
|
length_remaining = tvb_length_remaining(tvb, offset);
|
|
|
|
/*
|
|
* Can we do reassembly?
|
|
*/
|
|
if (nbss_desegment && pinfo->can_desegment) {
|
|
/*
|
|
* Yes - is the NBSS header split across segment boundaries?
|
|
*/
|
|
if (length_remaining < 4) {
|
|
/*
|
|
* Yes. Tell our caller how many more bytes
|
|
* we need.
|
|
*/
|
|
return -(4 - length_remaining);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the length of the NBSS message.
|
|
*/
|
|
if (is_cifs) {
|
|
flags = 0;
|
|
length = tvb_get_ntoh24(tvb, offset + 1);
|
|
} else {
|
|
flags = tvb_get_guint8(tvb, offset + 1);
|
|
length = tvb_get_ntohs(tvb, offset + 2);
|
|
if (flags & NBSS_FLAGS_E)
|
|
length += 65536;
|
|
}
|
|
|
|
/* give a hint to TCP where the next PDU starts
|
|
* so that it can attempt to find it in case it starts
|
|
* somewhere in the middle of a segment.
|
|
*/
|
|
if(!pinfo->fd->flags.visited){
|
|
if((length+4)>tvb_reported_length_remaining(tvb, offset)){
|
|
pinfo->want_pdu_tracking=2;
|
|
pinfo->bytes_until_next_pdu=(length+4)-tvb_reported_length_remaining(tvb, offset);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Can we do reassembly?
|
|
*/
|
|
if (nbss_desegment && pinfo->can_desegment) {
|
|
/*
|
|
* Yes - is the NBSS message split across segment boundaries?
|
|
*/
|
|
if (length_remaining < length + 4) {
|
|
/*
|
|
* Yes. Tell our caller how many more bytes
|
|
* we need.
|
|
*/
|
|
return -((length + 4) - length_remaining);
|
|
}
|
|
}
|
|
|
|
msg_type = tvb_get_guint8(tvb, offset);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_nbss, tvb, offset, length + 4, FALSE);
|
|
nbss_tree = proto_item_add_subtree(ti, ett_nbss);
|
|
|
|
proto_tree_add_uint_format(nbss_tree, hf_nbss_type, tvb,
|
|
offset, 1,
|
|
msg_type,
|
|
"Message Type: %s",
|
|
val_to_str(msg_type, message_types,
|
|
"Unknown (%x)"));
|
|
}
|
|
|
|
offset += 1;
|
|
|
|
if (is_cifs) {
|
|
if (tree) {
|
|
proto_tree_add_text(nbss_tree, tvb, offset, 3, "Length: %u", length);
|
|
}
|
|
offset += 3;
|
|
} else {
|
|
if (tree) {
|
|
tf = proto_tree_add_uint(nbss_tree, hf_nbss_flags, tvb, offset, 1, flags);
|
|
field_tree = proto_item_add_subtree(tf, ett_nbss_flags);
|
|
proto_tree_add_text(field_tree, tvb, offset, 1, "%s",
|
|
decode_boolean_bitfield(flags, NBSS_FLAGS_E,
|
|
8, "Add 65536 to length", "Add 0 to length"));
|
|
}
|
|
offset += 1;
|
|
|
|
if (tree) {
|
|
proto_tree_add_text(nbss_tree, tvb, offset, 2, "Length: %u", length);
|
|
}
|
|
|
|
offset += 2;
|
|
}
|
|
|
|
switch (msg_type) {
|
|
|
|
case SESSION_REQUEST:
|
|
len = get_nbns_name(tvb, offset, offset, name, &name_type);
|
|
if (tree)
|
|
add_name_and_type(nbss_tree, tvb, offset, len,
|
|
"Called name", name, name_type);
|
|
offset += len;
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", to %s ", name);
|
|
|
|
len = get_nbns_name(tvb, offset, offset, name, &name_type);
|
|
|
|
if (tree)
|
|
add_name_and_type(nbss_tree, tvb, offset, len,
|
|
"Calling name", name, name_type);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "from %s", name);
|
|
|
|
break;
|
|
|
|
case NEGATIVE_SESSION_RESPONSE:
|
|
if (tree)
|
|
proto_tree_add_text(nbss_tree, tvb, offset, 1,
|
|
"Error code: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset),
|
|
error_codes, "Unknown (%x)"));
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset),
|
|
error_codes, "Unknown (%x)"));
|
|
|
|
break;
|
|
|
|
case RETARGET_SESSION_RESPONSE:
|
|
if (tree)
|
|
proto_tree_add_text(nbss_tree, tvb, offset, 4,
|
|
"Retarget IP address: %s",
|
|
ip_to_str(tvb_get_ptr(tvb, offset, 4)));
|
|
|
|
offset += 4;
|
|
|
|
if (tree)
|
|
proto_tree_add_text(nbss_tree, tvb, offset, 2,
|
|
"Retarget port: %u",
|
|
tvb_get_ntohs(tvb, offset));
|
|
|
|
break;
|
|
|
|
case SESSION_MESSAGE:
|
|
/*
|
|
* Here we can pass the message off to the next protocol.
|
|
* Set the length of our top-level tree item to include
|
|
* only our stuff.
|
|
*/
|
|
proto_item_set_len(ti, offset);
|
|
len = tvb_length_remaining(tvb, offset);
|
|
reported_len = tvb_reported_length_remaining(tvb, offset);
|
|
if (len > length)
|
|
len = length;
|
|
if (reported_len > length)
|
|
reported_len = length;
|
|
|
|
next_tvb = tvb_new_subset(tvb, offset, len, reported_len);
|
|
|
|
/*
|
|
* Catch the ReportedBoundsError exception; if this
|
|
* particular message happens to get a ReportedBoundsError
|
|
* exception, that doesn't mean that we should stop
|
|
* dissecting NetBIOS messages within this frame or chunk
|
|
* of reassembled data.
|
|
*
|
|
* If it gets a BoundsError, we can stop, as there's nothing
|
|
* more to see, so we just re-throw it.
|
|
*/
|
|
saved_proto = pinfo->current_proto;
|
|
TRY {
|
|
dissect_netbios_payload(next_tvb, pinfo, tree);
|
|
}
|
|
CATCH(BoundsError) {
|
|
RETHROW;
|
|
}
|
|
CATCH(ReportedBoundsError) {
|
|
show_reported_bounds_error(tvb, pinfo, tree);
|
|
pinfo->current_proto = saved_proto;
|
|
}
|
|
ENDTRY;
|
|
break;
|
|
|
|
}
|
|
return length + 4;
|
|
}
|
|
|
|
static void
|
|
dissect_nbss(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
struct tcpinfo *tcpinfo = pinfo->private_data;
|
|
int offset = 0;
|
|
int max_data;
|
|
guint8 msg_type;
|
|
guint8 flags;
|
|
guint32 length;
|
|
int len;
|
|
gboolean is_cifs;
|
|
proto_tree *nbss_tree;
|
|
proto_item *ti;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NBSS");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
max_data = tvb_length(tvb);
|
|
|
|
msg_type = tvb_get_guint8(tvb, offset);
|
|
|
|
if (pinfo->match_port == TCP_PORT_CIFS) {
|
|
/*
|
|
* Windows 2000 CIFS clients can dispense completely
|
|
* with the NETBIOS encapsulation and directly use CIFS
|
|
* over TCP. As would be expected, the framing is
|
|
* identical, except that the length is 24 bits instead
|
|
* of 17. The only message types used are
|
|
* SESSION_MESSAGE and SESSION_KEEP_ALIVE.
|
|
*/
|
|
is_cifs = TRUE;
|
|
} else {
|
|
is_cifs = FALSE;
|
|
}
|
|
|
|
/*
|
|
* This might be a continuation of an earlier message.
|
|
* (Yes, that might be true even if we're doing TCP reassembly,
|
|
* as the first TCP segment in the capture might start in the
|
|
* middle of an NBNS message.)
|
|
*/
|
|
|
|
/*
|
|
* If this isn't reassembled data, check to see whether it
|
|
* looks like a continuation of a message.
|
|
* (If it is reassembled data, it shouldn't be a continuation,
|
|
* as reassembly should've gathered the continuations together
|
|
* into a message.)
|
|
*/
|
|
if (!tcpinfo->is_reassembled) {
|
|
if (max_data < 4) {
|
|
/*
|
|
* Not enough data for an NBSS header; assume
|
|
* it's a continuation of a message.
|
|
*
|
|
* XXX - if there's not enough data, we should
|
|
* attempt to reassemble the data, if the first byte
|
|
* is a valid message type.
|
|
*/
|
|
goto continuation;
|
|
}
|
|
|
|
/*
|
|
* We have enough data for an NBSS header.
|
|
* Get the flags and length of the message,
|
|
* and see if they're sane.
|
|
*/
|
|
if (is_cifs) {
|
|
flags = 0;
|
|
length = tvb_get_ntoh24(tvb, offset + 1);
|
|
} else {
|
|
flags = tvb_get_guint8(tvb, offset + 1);
|
|
length = tvb_get_ntohs(tvb, offset + 2);
|
|
if (flags & NBSS_FLAGS_E)
|
|
length += 65536;
|
|
}
|
|
if ((flags & (~NBSS_FLAGS_E)) != 0) {
|
|
/*
|
|
* A bogus flag was set; assume it's a continuation.
|
|
*/
|
|
goto continuation;
|
|
}
|
|
|
|
switch (msg_type) {
|
|
|
|
case SESSION_MESSAGE:
|
|
/*
|
|
* This is variable-length.
|
|
* All we know is that it shouldn't be zero.
|
|
* (XXX - can we get zero-length messages?
|
|
* Not with SMB, but perhaps other NetBIOS-based
|
|
* protocols have them.)
|
|
*/
|
|
if (length == 0)
|
|
goto continuation;
|
|
break;
|
|
|
|
case SESSION_REQUEST:
|
|
/*
|
|
* This is variable-length.
|
|
* The names are DNS-encoded 32-byte values;
|
|
* we need at least 2 bytes (one for each name;
|
|
* actually, we should have more for the first
|
|
* name, as there's no name preceding it so
|
|
* there should be no compression), and we
|
|
* shouldn't have more than 128 bytes (actually,
|
|
* we shouldn't have that many).
|
|
*
|
|
* XXX - actually, MacOS X 10.1 (yes, that's
|
|
* redundant, but that's what Apple calls it,
|
|
* not MacOS X.1) puts names longer than 16
|
|
* characters into session request messages,
|
|
* so we can have more than 32 bytes of
|
|
* name value, so we can have more than 128
|
|
* bytes of data.
|
|
*/
|
|
if (length < 2 || length > 256)
|
|
goto continuation;
|
|
break;
|
|
|
|
case POSITIVE_SESSION_RESPONSE:
|
|
/*
|
|
* This has no data, so the length must be zero.
|
|
*/
|
|
if (length != 0)
|
|
goto continuation;
|
|
break;
|
|
|
|
case NEGATIVE_SESSION_RESPONSE:
|
|
/*
|
|
* This has 1 byte of data.
|
|
*/
|
|
if (length != 1)
|
|
goto continuation;
|
|
break;
|
|
|
|
case RETARGET_SESSION_RESPONSE:
|
|
/*
|
|
* This has 6 bytes of data.
|
|
*/
|
|
if (length != 6)
|
|
goto continuation;
|
|
break;
|
|
|
|
case SESSION_KEEP_ALIVE:
|
|
/*
|
|
* This has no data, so the length must be zero.
|
|
*/
|
|
if (length != 0)
|
|
goto continuation;
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* Unknown message type; assume it's a continuation.
|
|
*/
|
|
goto continuation;
|
|
}
|
|
}
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
val_to_str(msg_type, message_types, "Unknown (%02x)"));
|
|
}
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
len = dissect_nbss_packet(tvb, offset, pinfo, tree, is_cifs);
|
|
if (len < 0) {
|
|
/*
|
|
* We need more data to dissect this, and
|
|
* desegmentation is enabled. "-len" is the
|
|
* number of additional bytes of data we need.
|
|
*
|
|
* Tell the TCP dissector where the data for this
|
|
* message starts in the data it handed us, and
|
|
* how many more bytes we need, and return.
|
|
*/
|
|
pinfo->desegment_offset = offset;
|
|
pinfo->desegment_len = -len;
|
|
return;
|
|
}
|
|
offset += len;
|
|
}
|
|
|
|
return;
|
|
|
|
continuation:
|
|
/*
|
|
* It looks like a continuation.
|
|
*/
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "NBSS Continuation Message");
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_nbss, tvb, 0, -1, FALSE);
|
|
nbss_tree = proto_item_add_subtree(ti, ett_nbss);
|
|
proto_tree_add_text(nbss_tree, tvb, 0, -1, "Continuation data");
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_nbt(void)
|
|
{
|
|
|
|
static hf_register_info hf_nbns[] = {
|
|
{ &hf_nbns_flags,
|
|
{ "Flags", "nbns.flags",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }},
|
|
{ &hf_nbns_flags_response,
|
|
{ "Response", "nbns.flags.response",
|
|
FT_BOOLEAN, 16, TFS(&tfs_flags_response), F_RESPONSE,
|
|
"Is the message a response?", HFILL }},
|
|
{ &hf_nbns_flags_opcode,
|
|
{ "Opcode", "nbns.flags.opcode",
|
|
FT_UINT16, BASE_DEC, VALS(opcode_vals), F_OPCODE,
|
|
"Operation code", HFILL }},
|
|
{ &hf_nbns_flags_authoritative,
|
|
{ "Authoritative", "nbns.flags.authoritative",
|
|
FT_BOOLEAN, 16, TFS(&tfs_flags_authoritative), F_AUTHORITATIVE,
|
|
"Is the server is an authority for the domain?", HFILL }},
|
|
{ &hf_nbns_flags_truncated,
|
|
{ "Truncated", "nbns.flags.truncated",
|
|
FT_BOOLEAN, 16, TFS(&tfs_flags_truncated), F_TRUNCATED,
|
|
"Is the message truncated?", HFILL }},
|
|
{ &hf_nbns_flags_recdesired,
|
|
{ "Recursion desired", "nbns.flags.recdesired",
|
|
FT_BOOLEAN, 16, TFS(&tfs_flags_recdesired), F_RECDESIRED,
|
|
"Do query recursively?", HFILL }},
|
|
{ &hf_nbns_flags_recavail,
|
|
{ "Recursion available", "nbns.flags.recavail",
|
|
FT_BOOLEAN, 16, TFS(&tfs_flags_recavail), F_RECAVAIL,
|
|
"Can the server do recursive queries?", HFILL }},
|
|
{ &hf_nbns_flags_broadcast,
|
|
{ "Broadcast", "nbns.flags.broadcast",
|
|
FT_BOOLEAN, 16, TFS(&tfs_flags_broadcast), F_BROADCAST,
|
|
"Is this a broadcast packet?", HFILL }},
|
|
{ &hf_nbns_flags_rcode,
|
|
{ "Reply code", "nbns.flags.rcode",
|
|
FT_UINT16, BASE_DEC, VALS(rcode_vals), F_RCODE,
|
|
"Reply code", HFILL }},
|
|
{ &hf_nbns_transaction_id,
|
|
{ "Transaction ID", "nbns.id",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"Identification of transaction", HFILL }},
|
|
{ &hf_nbns_count_questions,
|
|
{ "Questions", "nbns.count.queries",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of queries in packet", HFILL }},
|
|
{ &hf_nbns_count_answers,
|
|
{ "Answer RRs", "nbns.count.answers",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of answers in packet", HFILL }},
|
|
{ &hf_nbns_count_auth_rr,
|
|
{ "Authority RRs", "nbns.count.auth_rr",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of authoritative records in packet", HFILL }},
|
|
{ &hf_nbns_count_add_rr,
|
|
{ "Additional RRs", "nbns.count.add_rr",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of additional records in packet", HFILL }}
|
|
};
|
|
|
|
static hf_register_info hf_nbdgm[] = {
|
|
{ &hf_nbdgm_type,
|
|
{ "Message Type", "nbdgm.type",
|
|
FT_UINT8, BASE_DEC, VALS(nbds_msgtype_vals), 0x0,
|
|
"NBDGM message type", HFILL }},
|
|
{ &hf_nbdgm_fragment,
|
|
{ "More fragments follow", "nbdgm.next",
|
|
FT_BOOLEAN, BASE_NONE, TFS(&yesno), 0x0,
|
|
"TRUE if more fragments follow", HFILL }},
|
|
{ &hf_nbdgm_first,
|
|
{ "This is first fragment", "nbdgm.first",
|
|
FT_BOOLEAN, BASE_NONE, TFS(&yesno), 0x0,
|
|
"TRUE if first fragment", HFILL }},
|
|
{ &hf_nbdgm_node_type,
|
|
{ "Node Type", "nbdgm.node_type",
|
|
FT_UINT8, BASE_DEC, VALS(node_type_vals), 0x0,
|
|
"Node type", HFILL }},
|
|
{ &hf_nbdgm_datagram_id,
|
|
{ "Datagram ID", "nbdgm.dgram_id",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"Datagram identifier", HFILL }},
|
|
{ &hf_nbdgm_src_ip,
|
|
{ "Source IP", "nbdgm.src.ip",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
"Source IPv4 address", HFILL }},
|
|
{ &hf_nbdgm_src_port,
|
|
{ "Source Port", "nbdgm.src.port",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Source port", HFILL }}
|
|
};
|
|
|
|
static hf_register_info hf_nbss[] = {
|
|
{ &hf_nbss_type,
|
|
{ "Message Type", "nbss.type",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"NBSS message type", HFILL }},
|
|
{ &hf_nbss_flags,
|
|
{ "Flags", "nbss.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
"NBSS message flags", HFILL }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_nbns,
|
|
&ett_nbns_qd,
|
|
&ett_nbns_flags,
|
|
&ett_nbns_nb_flags,
|
|
&ett_nbns_name_flags,
|
|
&ett_nbns_rr,
|
|
&ett_nbns_qry,
|
|
&ett_nbns_ans,
|
|
&ett_nbdgm,
|
|
&ett_nbss,
|
|
&ett_nbss_flags,
|
|
};
|
|
module_t *nbss_module;
|
|
|
|
proto_nbns = proto_register_protocol("NetBIOS Name Service", "NBNS", "nbns");
|
|
proto_register_field_array(proto_nbns, hf_nbns, array_length(hf_nbns));
|
|
|
|
proto_nbdgm = proto_register_protocol("NetBIOS Datagram Service",
|
|
"NBDS", "nbdgm");
|
|
proto_register_field_array(proto_nbdgm, hf_nbdgm, array_length(hf_nbdgm));
|
|
|
|
proto_nbss = proto_register_protocol("NetBIOS Session Service",
|
|
"NBSS", "nbss");
|
|
proto_register_field_array(proto_nbss, hf_nbss, array_length(hf_nbss));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
nbss_module = prefs_register_protocol(proto_nbss, NULL);
|
|
prefs_register_bool_preference(nbss_module, "desegment_nbss_commands",
|
|
"Desegment all NBSS packets spanning multiple TCP segments",
|
|
"Whether NBSS dissector should desegment all packets spanning multiple TCP segments",
|
|
&nbss_desegment);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_nbt(void)
|
|
{
|
|
dissector_handle_t nbns_handle, nbdgm_handle, nbss_handle;
|
|
|
|
nbns_handle = create_dissector_handle(dissect_nbns, proto_nbns);
|
|
dissector_add("udp.port", UDP_PORT_NBNS, nbns_handle);
|
|
nbdgm_handle = create_dissector_handle(dissect_nbdgm, proto_nbdgm);
|
|
dissector_add("udp.port", UDP_PORT_NBDGM, nbdgm_handle);
|
|
nbss_handle = create_dissector_handle(dissect_nbss, proto_nbss);
|
|
dissector_add("tcp.port", TCP_PORT_NBSS, nbss_handle);
|
|
dissector_add("tcp.port", TCP_PORT_CIFS, nbss_handle);
|
|
}
|