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wireshark/packet-netbios.c

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/* packet-netbios.c
* Routines for NetBIOS protocol packet disassembly
* Jeff Foster <foste@woodward.com>
* Copyright 1999 Jeffrey C. Foster
*
* derived from the packet-nbns.c
*
* $Id: packet-netbios.c,v 1.14 2000/01/23 08:55:34 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "packet.h"
#include "packet-netbios.h"
/* Netbios command numbers */
#define NB_ADD_GROUP 0x00
#define NB_ADD_NAME 0x01
#define NB_NAME_IN_CONFLICT 0x02
#define NB_STATUS_QUERY 0x03
#define NB_TERMINATE_TRACE_R 0x07
#define NB_DATAGRAM 0x08
#define NB_DATAGRAM_BCAST 0x09
#define NB_NAME_QUERY 0x0a
#define NB_ADD_NAME_RESP 0x0d
#define NB_NAME_RESP 0x0e
#define NB_STATUS_RESP 0x0f
#define NB_TERMINATE_TRACE_LR 0x13
#define NB_DATA_ACK 0x14
#define NB_DATA_FIRST_MIDDLE 0x15
#define NB_DATA_ONLY_LAST 0x16
#define NB_SESSION_CONFIRM 0x17
#define NB_SESSION_END 0x18
#define NB_SESSION_INIT 0x19
#define NB_NO_RECEIVE 0x1a
#define NB_RECEIVE_OUTSTANDING 0x1b
#define NB_RECEIVE_CONTINUE 0x1c
#define NB_KEEP_ALIVE 0x1f
/* Offsets of fields in the NetBIOS header. */
#define NB_LENGTH 0
#define NB_DELIMITER 2
#define NB_COMMAND 4
#define NB_FLAGS 5
#define NB_DATA1 5
#define NB_RESYNC 6
#define NB_DATA2 6
#define NB_CALL_NAME_TYPE 7
#define NB_XMIT_CORL 8
#define NB_RESP_CORL 10
#define NB_RMT_SES 12
#define NB_LOCAL_SES 13
#define NB_RECVER_NAME 12
#define NB_SENDER_NAME 28
static int proto_netbios = -1;
static gint ett_netb = -1;
static gint ett_netb_name = -1;
static gint ett_netb_flags = -1;
static gint ett_netb_status = -1;
/* The strings for the station type, used by get_netbios_name function;
many of them came from the file "NetBIOS.txt" in the Zip archive at
http://www.net3group.com/ftp/browser.zip
*/
static const value_string name_type_vals[] = {
{0x00, "Workstation/Redirector"},
{0x01, "Browser"},
{0x02, "Workstation/Redirector"},
/* not sure what 0x02 is, I'm seeing alot of them however */
/* i'm seeing them with workstation/redirection host
announcements */
{0x03, "Messenger service/Main name"},
{0x05, "Forwarded name"},
{0x06, "RAS Server service"},
{0x1b, "PDC Domain name"},
{0x1c, "BDC Domain name"},
{0x1d, "Master Browser backup"},
{0x1e, "Browser Election Service"},
{0x1f, "Net DDE Service"},
{0x20, "Server service"},
{0x21, "RAS client service"},
{0x22, "Exchange Interchange (MSMail Connector)"},
{0x23, "Exchange Store"},
{0x24, "Exchange Directory"},
{0x2b, "Lotus Notes Server service"},
{0x30, "Modem sharing server service"},
{0x31, "Modem sharing client service"},
{0x43, "SMS Clients Remote Control"},
{0x44, "SMS Administrators Remote Control Tool"},
{0x45, "SMS Clients Remote Chat"},
{0x46, "SMS Clients Remote Transfer"},
{0x4c, "DEC Pathworks TCP/IP Service on Windows NT"},
{0x52, "DEC Pathworks TCP/IP Service on Windows NT"},
{0x6a, "Microsoft Exchange IMC"},
{0x87, "Microsoft Exchange MTA"},
{0xbe, "Network Monitor Agent"},
{0xbf, "Network Monitor Analyzer"},
{0x00, NULL}
};
/* See
http://www.s390.ibm.com/bookmgr-cgi/bookmgr.cmd/BOOKS/BK8P7001/CCONTENTS
and
http://ourworld.compuserve.com/homepages/TimothyDEvans/contents.htm
for information about the NetBIOS Frame Protocol (which is what this
module dissects). */
/* the strings for the command types */
static char *CommandName[] = {
"Add Group Name Query", /* 0x00 */
"Add Name Query", /* 0x01 */
"Name In Conflict", /* 0x02 */
"Status Query", /* 0x03 */
"Unknown",
"Unknown",
"Unknown",
"Terminate Trace", /* 0x07 */
"Datagram", /* 0x08 */
"Broadcast Datagram", /* 0x09 */
"Name Query", /* 0x0A */
"Unknown",
"Unknown",
"Add Name Response", /* 0x0D */
"Name Recognized", /* 0x0E */
"Status Response", /* 0x0F */
"Unknown",
"Unknown",
"Unknown",
"Terminate Trace", /* 0x13 */
"Data Ack", /* 0x14 */
"Data First Middle", /* 0x15 */
"Data Only Last", /* 0x16 */
"Session Confirm", /* 0x17 */
"Session End", /* 0x18 */
"Session Initialize", /* 0x19 */
"No Receive", /* 0x1a */
"Receive Outstanding", /* 0x1b */
"Receive Continue", /* 0x1c */
"Unknown",
"Unknown",
"Session Alive", /* 0x1f */
};
void capture_netbios(const u_char *pd, int offset, packet_counts *ld)
{
ld->netbios++;
}
int
process_netbios_name(const u_char *name_ptr, char *name_ret)
{
int i;
int name_type = *(name_ptr + NETBIOS_NAME_LEN - 1);
u_char name_char;
static const char hex_digits[16] = "0123456789abcdef";
for (i = 0; i < NETBIOS_NAME_LEN - 1; i++) {
name_char = *name_ptr++;
if (name_char >= ' ' && name_char <= '~')
*name_ret++ = name_char;
else {
/* It's not printable; show it as <XX>, where
XX is the value in hex. */
*name_ret++ = '<';
*name_ret++ = hex_digits[(name_char >> 4)];
*name_ret++ = hex_digits[(name_char & 0x0F)];
*name_ret++ = '>';
}
}
*name_ret = '\0';
return name_type;
}
int get_netbios_name(const u_char *pd, int offset, char *name_ret)
{/* Extract the name string and name type. Return the name string in */
/* name_ret and return the name_type. */
if (!BYTES_ARE_IN_FRAME(offset, NETBIOS_NAME_LEN)) {
/*
* Name goes past end of captured data in packet.
*/
return -1;
}
return process_netbios_name(&pd[offset], name_ret);
}
/*
* Get a string describing the type of a NetBIOS name.
*/
char *
netbios_name_type_descr(int name_type)
{
return val_to_str(name_type, name_type_vals, "Unknown");
}
gboolean netbios_add_name(char* label, const u_char *pd, int offset,
proto_tree *tree)
{/* add a name field display tree. Display the name and station type in sub-tree */
proto_tree *field_tree;
proto_item *tf;
char name_str[(NETBIOS_NAME_LEN - 1)*4 + 1];
int name_type;
char *name_type_str;
/* decode the name field */
name_type = get_netbios_name(pd, offset, name_str);
if (name_type < 0) {
/*
* Name goes past end of captured data in packet.
*/
return FALSE;
}
name_type_str = netbios_name_type_descr(name_type);
tf = proto_tree_add_text( tree, offset, NETBIOS_NAME_LEN,
"%s: %s<%02x> (%s)", label, name_str, name_type, name_type_str);
field_tree = proto_item_add_subtree( tf, ett_netb_name);
proto_tree_add_text( field_tree, offset, 15, "%s",
name_str);
proto_tree_add_text( field_tree, offset + 15, 1,
"0x%02x (%s)", name_type, name_type_str);
return TRUE;
}
static void netbios_data_first_middle_flags(const u_char *pd, proto_tree *tree,
int offset)
{
proto_tree *field_tree;
proto_item *tf;
guint flags = pd[offset];
/* decode the flag field for Data First Middle packet*/
tf = proto_tree_add_text(tree, offset, 1,
"Flags: 0x%02x", flags);
field_tree = proto_item_add_subtree(tf, ett_netb_flags);
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x08, 8,
"Acknowledge_included", "No Acknowledge_included"));
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x02, 8,
"No acknowledgement expected", "Acknowledgement expected"));
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x01, 8,
"RECEIVE_CONTINUE requested", "RECEIVE_CONTINUE not requested"));
}
static void netbios_data_only_flags(const u_char *pd, proto_tree *tree,
int offset)
{
proto_tree *field_tree;
proto_item *tf;
guint flags = pd[offset];
/* decode the flag field for Data Only Last packet*/
tf = proto_tree_add_text(tree, offset, 1,
"Flags: 0x%02x", flags);
field_tree = proto_item_add_subtree(tf, ett_netb_flags);
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x08, 8,
"ACKNOWLEDGE_INCLUDED", "No ACKNOWLEDGE_INCLUDED"));
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x04, 8,
"ACKNOWLEDGE_WITH_DATA_ALLOWED", "No ACKNOWLEDGE_WITH_DATA_ALLOWED"));
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x02, 8,
"No acknowledgement expected", "Acknowledgement expected"));
}
static void netbios_add_ses_confirm_flags(const u_char *pd, proto_tree *tree,
int offset)
{
proto_tree *field_tree;
proto_item *tf;
guint flags = pd[offset];
/* decode the flag field for Session Confirm packet */
tf = proto_tree_add_text(tree, offset, 1,
"Flags: 0x%02x", flags);
field_tree = proto_item_add_subtree( tf, ett_netb_flags);
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x80, 8,
"Can handle SEND.NO.ACK", "Can't handle SEND.NO.ACK"));
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x01, 8,
"NetBIOS 2.00 or higher", "NetBIOS 1.xx"));
}
static void netbios_add_session_init_flags(const u_char *pd, proto_tree *tree,
int offset)
{
proto_tree *field_tree;
proto_item *tf;
guint flags = pd[offset];
/* decode the flag field for Session Init packet */
tf = proto_tree_add_text(tree, offset, 1,
"Flags: 0x%02x", flags);
field_tree = proto_item_add_subtree(tf, ett_netb_flags);
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x80, 8,
"Can handle SEND.NO.ACK", "Can't handle SEND.NO.ACK"));
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_numeric_bitfield(flags, 0x0E, 8,
"Largest frame value = %u"));
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x01, 8,
"NetBIOS 2.00 or higher", "NetBIOS 1.xx"));
}
static void netbios_no_receive_flags(const u_char *pd, proto_tree *tree,
int offset)
{
proto_tree *field_tree;
proto_item *tf;
guint flags = pd[offset];
/* decode the flag field for No Receive packet*/
tf = proto_tree_add_text(tree, offset, 1,
"Flags: 0x%02x", flags);
if (flags & 0x02) {
field_tree = proto_item_add_subtree(tf, ett_netb_flags);
proto_tree_add_text(field_tree, offset, 1, "%s",
decode_boolean_bitfield(flags, 0x02, 8,
"SEND.NO.ACK data not received", NULL));
}
}
/************************************************************************/
/* */
/* The routines to display the netbios field values in the tree */
/* */
/************************************************************************/
static void nb_xmit_corrl(const u_char *pd, int offset, proto_tree *tree)
{/* display the transmit correlator */
proto_tree_add_text( tree, offset + NB_XMIT_CORL, 2,
"Transmit Correlator: 0x%04x", pletohs(&pd[offset + NB_XMIT_CORL]));
}
static void nb_resp_corrl(const u_char *pd, int offset, proto_tree *tree)
{/* display the response correlator */
proto_tree_add_text( tree, offset + NB_RESP_CORL, 2,
"Response Correlator: 0x%04x", pletohs(&pd[offset + NB_RESP_CORL]));
}
static void nb_call_name_type(const u_char *pd, int offset,
proto_tree *tree)
{/* display the call name type */
int name_type_value = pd[offset + NB_CALL_NAME_TYPE];
switch (name_type_value) {
case 0x00:
proto_tree_add_text( tree, offset + NB_CALL_NAME_TYPE, 1,
"Caller's Name Type: Unique name");
break;
case 0x01:
proto_tree_add_text( tree, offset + NB_CALL_NAME_TYPE, 1,
"Caller's Name Type: Group name");
break;
default:
proto_tree_add_text( tree, offset + NB_CALL_NAME_TYPE, 1,
"Caller's Name Type: 0x%02x (should be 0 or 1)",
name_type_value);
break;
}
}
static void nb_local_session(const u_char *pd, int offset,
proto_tree *tree)
{/* add the local session to tree */
proto_tree_add_text(tree, offset + NB_LOCAL_SES, 1,
"Local Session No.: 0x%02x", pd[offset + NB_LOCAL_SES]);
}
static void nb_remote_session(const u_char *pd, int offset,
proto_tree *tree)
{/* add the remote session to tree */
proto_tree_add_text(tree, offset + NB_RMT_SES, 1,
"Remote Session No.: 0x%02x", pd[offset + NB_RMT_SES]);
}
static void nb_data2(char *label, int len, const u_char *pd, int offset,
proto_tree *tree)
{/* add the DATA2 to tree with format string = label and length of len */
int value = (len == 1 ? pd[offset + NB_DATA2]
: pletohs(&pd[offset + NB_DATA2]));
proto_tree_add_text(tree, offset + NB_DATA2, len, label, value);
}
static void nb_resync_indicator(const u_char *pd, int offset,
proto_tree *tree)
{
guint16 resync_indicator = pletohs(&pd[offset + NB_DATA2]);
switch (resync_indicator) {
case 0x0000:
proto_tree_add_text(tree, offset + NB_DATA2, 2,
"Re-sync indicator: Not first Data First Middle following Receive Outstanding");
break;
case 0x0001:
proto_tree_add_text(tree, offset + NB_DATA2, 2,
"Re-sync indicator: First Data First Middle following Receive Outstanding");
break;
default:
proto_tree_add_text(tree, offset + NB_DATA2, 2,
"Re-sync indicator: 0x%04x", resync_indicator);
break;
}
}
/************************************************************************/
/* */
/* The routines called by the top level to handle individual commands */
/* */
/************************************************************************/
static void dissect_netb_unknown(const u_char *data_ptr, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle any unknow commands, do nothing */
/* dissect_data( data_ptr, offset + NB_COMMAND + 1, fd, tree); */
}
static void dissect_netb_add_group_name(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the ADD GROUP NAME QUERY command */
nb_resp_corrl(pd, offset, tree);
netbios_add_name("Group name to add", pd, offset + NB_SENDER_NAME,
tree);
}
static void dissect_netb_add_name(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the ADD NAME QUERY command */
nb_resp_corrl(pd, offset, tree);
netbios_add_name("Name to add", pd, offset + NB_SENDER_NAME, tree);
}
static void dissect_netb_name_in_conflict(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the NAME IN CONFLICT command */
if (!netbios_add_name("Name In Conflict", pd, offset + NB_RECVER_NAME,
tree))
return;
netbios_add_name("Sender's Name", pd, offset + NB_SENDER_NAME,
tree);
}
static void dissect_netb_status_query(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the STATUS QUERY command */
guint8 status_request = pd[offset + NB_DATA1];
switch (status_request) {
case 0:
proto_tree_add_text(tree, offset + NB_DATA1, 1,
"Status request: NetBIOS 1.x or 2.0");
break;
case 1:
proto_tree_add_text(tree, offset + NB_DATA1, 1,
"Status request: NetBIOS 2.1, initial status request");
break;
default:
proto_tree_add_text(tree, offset + NB_DATA1, 1,
"Status request: NetBIOS 2.1, %u names received so far",
status_request);
break;
}
nb_data2("Length of status buffer: %u", 2, pd, offset, tree);
nb_resp_corrl(pd, offset, tree);
if (!netbios_add_name("Receiver's Name", pd, offset + NB_RECVER_NAME,
tree))
return;
netbios_add_name("Sender's Name", pd, offset + NB_SENDER_NAME,
tree);
}
static u_char zeroes[10];
static void dissect_netb_datagram(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the DATAGRAM command */
if (!netbios_add_name("Receiver's Name", pd, offset + NB_RECVER_NAME,
tree))
return;
/* Weird. In some datagrams, this is 10 octets of 0, followed
by a MAC address.... */
if (memcmp(&pd[offset + NB_SENDER_NAME], zeroes, 10) == 0) {
proto_tree_add_text( tree, offset + NB_SENDER_NAME + 10, 6,
"Sender's MAC Address: %s",
ether_to_str(&pd[offset + NB_SENDER_NAME + 10]));
} else {
netbios_add_name("Sender's Name", pd, offset + NB_SENDER_NAME,
tree);
}
}
static void dissect_netb_datagram_bcast(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the DATAGRAM BROADCAST command */
/* We assume the same weirdness can happen here.... */
if (memcmp(&pd[offset + NB_SENDER_NAME], zeroes, 10) == 0) {
proto_tree_add_text( tree, offset + NB_SENDER_NAME + 10, 6,
"Sender's Node Address: %s",
ether_to_str(&pd[offset + NB_SENDER_NAME + 10]));
} else {
netbios_add_name("Sender's Name", pd, offset + NB_SENDER_NAME,
tree);
}
}
static void dissect_netb_name_query(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the NAME QUERY command */
guint8 local_session_number = pd[offset + NB_DATA2];
if (local_session_number == 0) {
proto_tree_add_text( tree, offset + NB_DATA2, 1,
"Local Session No.: 0 (FIND.NAME request)");
} else {
proto_tree_add_text( tree, offset + NB_DATA2, 1,
"Local Session No.: 0x%02x", local_session_number);
}
nb_call_name_type(pd, offset, tree);
nb_resp_corrl(pd, offset, tree);
if (!netbios_add_name("Query Name", pd, offset + NB_RECVER_NAME, tree))
return;
if (local_session_number != 0) {
netbios_add_name("Sender's Name", pd, offset + NB_SENDER_NAME,
tree);
}
}
static void dissect_netb_add_name_resp(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the ADD NAME RESPONSE command */
guint8 status = pd[offset + NB_DATA1];
guint16 name_type = pletohs(&pd[offset + NB_DATA2]);
switch (status) {
case 0:
proto_tree_add_text( tree, offset + NB_DATA1, 1,
"Status: Add name not in process");
break;
case 1:
proto_tree_add_text( tree, offset + NB_DATA1, 1,
"Status: Add name in process");
break;
default:
proto_tree_add_text( tree, offset + NB_DATA1, 1,
"Status: 0x%02x (should be 0 or 1)", status);
break;
}
switch (name_type) {
case 0:
proto_tree_add_text( tree, offset + NB_DATA2, 2,
"Name type: Unique name");
break;
case 1:
proto_tree_add_text( tree, offset + NB_DATA2, 2,
"Name type: Group name");
break;
default:
proto_tree_add_text( tree, offset + NB_DATA2, 2,
"Name type: 0x%04x (should be 0 or 1)", name_type);
break;
}
nb_xmit_corrl(pd, offset, tree);
if (!netbios_add_name("Name to be added", pd, offset + NB_RECVER_NAME,
tree))
return;
netbios_add_name("Name to be added", pd, offset + NB_SENDER_NAME,
tree);
}
static void dissect_netb_name_resp(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the NAME RECOGNIZED command */
guint8 local_session_number = pd[offset + NB_DATA2];
switch (local_session_number) {
case 0x00:
proto_tree_add_text( tree, offset + NB_DATA2, 1,
"State of name: No LISTEN pending, or FIND.NAME response");
break;
case 0xFF:
proto_tree_add_text( tree, offset + NB_DATA2, 1,
"State of name: LISTEN pending, but insufficient resources to establish session");
break;
default:
proto_tree_add_text( tree, offset + NB_DATA2, 1,
"Local Session No.: 0x%02x", local_session_number);
break;
}
nb_call_name_type(pd, offset, tree);
nb_xmit_corrl(pd, offset, tree);
if (local_session_number != 0x00 && local_session_number != 0xFF)
nb_resp_corrl(pd, offset, tree);
if (!netbios_add_name("Receiver's Name", pd, offset + NB_RECVER_NAME,
tree))
return;
if (local_session_number != 0x00 && local_session_number != 0xFF) {
netbios_add_name("Sender's Name", pd, offset + NB_SENDER_NAME,
tree);
}
}
static void dissect_netb_status_resp(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the STATUS RESPONSE command */
guint8 status_response = pd[offset + NB_DATA1];
proto_item *td2;
proto_tree *data2_tree;
guint16 data2;
nb_call_name_type(pd, offset, tree);
if (status_response == 0) {
proto_tree_add_text(tree, offset + NB_DATA1, 1,
"Status response: NetBIOS 1.x or 2.0");
} else {
proto_tree_add_text(tree, offset + NB_DATA1, 1,
"Status response: NetBIOS 2.1, %u names sent so far",
status_response);
}
data2 = pletohs(&pd[offset + NB_DATA2]);
td2 = proto_tree_add_text(tree, offset + NB_DATA2, 2, "Status: 0x04x",
data2);
data2_tree = proto_item_add_subtree(td2, ett_netb_status);
if (data2 & 0x8000) {
proto_tree_add_text(data2_tree, offset, 2, "%s",
decode_boolean_bitfield(data2, 0x8000, 8*2,
"Data length exceeds maximum frame size", NULL));
}
if (data2 & 0x4000) {
proto_tree_add_text(data2_tree, offset, 2, "%s",
decode_boolean_bitfield(data2, 0x4000, 8*2,
"Data length exceeds user's buffer", NULL));
}
proto_tree_add_text(data2_tree, offset, 2, "%s",
decode_numeric_bitfield(data2, 0x3FFF, 2*8,
"Status data length = %u"));
nb_xmit_corrl(pd, offset, tree);
if (!netbios_add_name("Receiver's Name", pd, offset + NB_RECVER_NAME,
tree))
return;
netbios_add_name("Sender's Name", pd, offset + NB_SENDER_NAME,
tree);
}
static void dissect_netb_data_ack(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the DATA ACK command */
nb_xmit_corrl(pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_data_first_middle(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the DATA FIRST MIDDLE command */
netbios_data_first_middle_flags(pd, tree, offset + NB_FLAGS);
nb_resync_indicator(pd, offset, tree);
nb_xmit_corrl(pd, offset, tree);
nb_resp_corrl(pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_data_only_last(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the DATA ONLY LAST command */
netbios_data_only_flags(pd, tree, offset + NB_FLAGS);
nb_resync_indicator(pd, offset, tree);
nb_xmit_corrl(pd, offset, tree);
nb_resp_corrl(pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_session_confirm(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the SESSION CONFIRM command */
netbios_add_ses_confirm_flags(pd, tree, offset + NB_FLAGS);
nb_data2("Max data recv size: %u", 2, pd, offset, tree);
nb_xmit_corrl(pd, offset, tree);
nb_resp_corrl(pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_session_end(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the SESSION END command */
guint16 termination_indicator = pletohs(&pd[offset + NB_DATA2]);
switch (termination_indicator) {
case 0x0000:
proto_tree_add_text( tree, offset + NB_DATA2, 2,
"Termination indicator: Normal session end");
break;
case 0x0001:
proto_tree_add_text( tree, offset + NB_DATA2, 2,
"Termination indicator: Abormal session end");
break;
default:
proto_tree_add_text( tree, offset + NB_DATA2, 2,
"Termination indicator: 0x%04x (should be 0x0000 or 0x0001)",
termination_indicator);
break;
}
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_session_init(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the SESSION INITIALIZE command */
netbios_add_session_init_flags(pd, tree, offset + NB_FLAGS);
nb_data2("Max data recv size: %u", 2, pd, offset, tree);
nb_resp_corrl(pd, offset, tree);
nb_xmit_corrl(pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_no_receive(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the NO RECEIVE command */
netbios_no_receive_flags(pd, tree, offset + NB_FLAGS);
nb_data2("Number of data bytes accepted: %u", 2, pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_receive_outstanding(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the RECEIVE OUTSTANDING command */
nb_data2("Number of data bytes accepted: %u", 2, pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
static void dissect_netb_receive_continue(const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{/* Handle the RECEIVE CONTINUE command */
nb_xmit_corrl(pd, offset, tree);
nb_remote_session(pd, offset, tree);
nb_local_session(pd, offset, tree);
}
/************************************************************************/
/* */
/* The table routines called by the top level to handle commands */
/* */
/************************************************************************/
void (*dissect_netb[])(const u_char *, int, frame_data *, proto_tree *) = {
dissect_netb_add_group_name, /* Add Group Name 0x00 */
dissect_netb_add_name, /* Add Name 0x01 */
dissect_netb_name_in_conflict,/* Name In Conflict 0x02 */
dissect_netb_status_query, /* Status Query 0x03 */
dissect_netb_unknown, /* unknown 0x04 */
dissect_netb_unknown, /* unknown 0x05 */
dissect_netb_unknown, /* unknown 0x06 */
dissect_netb_unknown, /* Terminate Trace 0x07 */
dissect_netb_datagram, /* Datagram 0x08 */
dissect_netb_datagram_bcast, /* Datagram Broadcast 0x09 */
dissect_netb_name_query, /* Name Query 0x0A */
dissect_netb_unknown, /* unknown 0x0B */
dissect_netb_unknown, /* unknown 0x0C */
dissect_netb_add_name_resp, /* Add Name Response 0x0D */
dissect_netb_name_resp, /* Name Recognized 0x0E */
dissect_netb_status_resp, /* Status Response 0x0F */
dissect_netb_unknown, /* unknown 0x10 */
dissect_netb_unknown, /* unknown 0x11 */
dissect_netb_unknown, /* unknown 0x12 */
dissect_netb_unknown, /* Terminate Trace 0x13 */
dissect_netb_data_ack, /* Data Ack 0x14 */
dissect_netb_data_first_middle,/* Data First Middle 0x15 */
dissect_netb_data_only_last, /* Data Only Last 0x16 */
dissect_netb_session_confirm, /* Session Confirm 0x17 */
dissect_netb_session_end, /* Session End 0x18 */
dissect_netb_session_init, /* Session Initialize 0x19 */
dissect_netb_no_receive, /* No Receive 0x1A */
dissect_netb_receive_outstanding,/* Receive Outstanding 0x1B */
dissect_netb_receive_continue,/* Receive Continue 0x1C */
dissect_netb_unknown, /* unknown 0x1D */
dissect_netb_unknown, /* unknown 0x1E */
dissect_netb_unknown, /* Session Alive 0x1f (nothing to do) */
};
void dissect_netbios(const u_char *pd, int offset, frame_data *fd,
proto_tree *tree)
{
proto_tree *netb_tree;
proto_item *ti;
guint16 hdr_len, command;
char name[(NETBIOS_NAME_LEN - 1)*4 + 1];
int name_type;
/* Find NetBIOS marker EFFF, this is done because I have seen an extra LLC */
/* byte on our network. This only checks for one extra LLC byte. */
if (( pd[offset + 2] != 0xff) || ( pd[offset + 3] != 0xef)){
++offset;
if (( pd[offset + 2] != 0xff)
|| ( pd[offset + 3] != 0xef)){
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "NetBIOS");
if (check_col(fd, COL_INFO)) /* print bad packet */
col_add_str(fd, COL_INFO, "Bad packet");
if (tree) {
ti = proto_tree_add_item(tree, proto_netbios,
offset, END_OF_FRAME, NULL);
netb_tree = proto_item_add_subtree(ti, ett_netb);
proto_tree_add_text( netb_tree, offset,
END_OF_FRAME, "Data (%u bytes)",
END_OF_FRAME);
}
return;
}
}
/* To do: check for runts, errs, etc. */
hdr_len = pletohs(&pd[offset + NB_LENGTH]);
command = pd[offset + NB_COMMAND];
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "NetBIOS");
if (check_col(fd, COL_INFO)) { /* print command name */
switch ( command ) {
case NB_NAME_QUERY:
name_type = get_netbios_name( pd, offset + 12, name);
col_add_fstr(fd, COL_INFO, "%s for %s<%02x>",
CommandName[ command], name, name_type);
break;
case NB_NAME_RESP:
name_type = get_netbios_name( pd, offset + 28, name);
col_add_fstr(fd, COL_INFO, "%s - %s<%02x>",
CommandName[ command], name, name_type);
break;
default:
if ( command < sizeof( dissect_netb)/ sizeof(void *))
col_add_fstr(fd, COL_INFO, "%s", CommandName[ command]);
else
col_add_fstr(fd, COL_INFO, "Unknown");
break;
}
}
if (tree) {
ti = proto_tree_add_item(tree, proto_netbios, offset, END_OF_FRAME, NULL);
netb_tree = proto_item_add_subtree(ti, ett_netb);
proto_tree_add_text(netb_tree, offset, 2,
"Header Length: %d", hdr_len);
proto_tree_add_text(netb_tree, offset + 2, 2,
"Delimiter: EFFF (NetBIOS)");
proto_tree_add_text(netb_tree, offset + NB_COMMAND, 1,
"Command: 0x%02x (%s)", command, CommandName[ command]);
/* if command in table range */
if ( command < sizeof( dissect_netb)/ sizeof(void *))
/* branch to handle commands */
(dissect_netb[ command])( pd, offset, fd,
netb_tree);
}
/* Test for SMB data */
if ( (END_OF_FRAME) > ( hdr_len + 4)){ /* if enough data */
offset += hdr_len; /* move past header */
if (( pd[offset + 0] == 0xff) && /* if SMB marker */
( pd[offset + 1] == 'S') &&
( pd[offset + 2] == 'M') &&
( pd[offset + 3] == 'B'))
/* decode SMB */
dissect_smb(pd, offset, fd, tree,
END_OF_FRAME - hdr_len);
}
/*$$$$ somewhere around here need to check for frame padding */
}
void proto_register_netbios(void)
{
static gint *ett[] = {
&ett_netb,
&ett_netb_name,
&ett_netb_flags,
&ett_netb_status,
};
proto_netbios = proto_register_protocol("NetBIOS", "netbios");
proto_register_subtree_array(ett, array_length(ett));
}
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