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/* packet-nbns.c
* Routines for NetBIOS Name Service packet disassembly
* Gilbert Ramirez <gram@verdict.uthscsa.edu>
*
* $Id: packet-nbns.c,v 1.1 1998/10/14 04:09:11 gram 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
#include <gtk/gtk.h>
#include <pcap.h>
#include <stdio.h>
#include <memory.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include "ethereal.h"
#include "packet.h"
/* Packet structure taken from RFC 1002. See also RFC 1001.
* The Samba source code, specifically nmblib.c, also helps a lot. */
struct nbns_header {
guint16 name_tran_id;
guint8 r;
guint8 opcode;
struct {
guint8 bcast;
guint8 recursion_available;
guint8 recursion_desired;
guint8 trunc;
guint8 authoritative;
} nm_flags;
guint8 rcode;
guint16 qdcount;
guint16 ancount;
guint16 nscount;
guint16 arcount;
};
void
dissect_nbns(const u_char *pd, int offset, frame_data *fd, GtkTree *tree)
{
GtkWidget *nbns_tree, *ti;
struct nbns_header header;
int nm_flags;
char *opcode[] = {
"Query",
"Unknown",
"Unknown",
"Unknown",
"Unknown",
"Registration",
"Release",
"Wait and Acknowledge",
"Refresh"
"Refresh(altcode)"
"Unknown",
"Unknown",
"Unknown",
"Unknown",
"Unknown",
"Multi-Homed Registration",
};
if (fd->win_info[COL_NUM]) {
/*strcpy(fd->win_info[COL_PROTOCOL], "NBNS (UDP)");*/
strcpy(fd->win_info[COL_PROTOCOL], "NBNS");
strcpy(fd->win_info[COL_INFO], "NetBIOS Name Service");
}
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, END_OF_FRAME,
"NetBIOS Name Service");
nbns_tree = gtk_tree_new();
add_subtree(ti, nbns_tree, ETT_NBNS);
/* This is taken from samba/source/nmlib.c, parse_nmb() */
header.name_tran_id = pntohs(&pd[offset]);
header.opcode = (pd[offset+2] >> 3) & 0xf;
header.r = (pd[offset+2] >> 7) & 1;
nm_flags = ((pd[offset+2] & 0x7) << 4) + (pd[offset+3] >> 4);
header.nm_flags.bcast = (nm_flags & 1) ? 1 : 0;
header.nm_flags.recursion_available = (nm_flags & 8) ? 1 : 0;
header.nm_flags.recursion_desired = (nm_flags & 0x10) ? 1 : 0;
header.nm_flags.trunc = (nm_flags & 0x20) ? 1 : 0;
header.nm_flags.authoritative = (nm_flags & 0x40) ? 1 : 0;
header.rcode = pd[offset+3] & 0xf;
header.qdcount = pletohs(&pd[offset+4]);
header.ancount = pletohs(&pd[offset+6]);
header.nscount = pletohs(&pd[offset+8]);
header.arcount = pletohs(&pd[offset+10]);
add_item_to_tree(nbns_tree, offset, 2, "Transaction ID: 0x%04X",
header.name_tran_id);
add_item_to_tree(nbns_tree, offset + 2, 1, "Type: %s",
header.r == 0 ? "Request" : "Response" );
if (header.opcode <= 15) {
add_item_to_tree(nbns_tree, offset + 2, 1, "Operation: %s (%d)",
opcode[header.opcode], header.opcode);
}
else {
add_item_to_tree(nbns_tree, offset + 2, 1, "Operation: Unknown (%d)",
header.opcode);
}
/* add_item_to_tree(nbns_tree, offset+2, 2, */
}
}
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