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packet-nbns.c
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/* packet-nbns.c
* Routines for NetBIOS-over-TCP packet disassembly (the name dates back
* to when it had only NBNS)
* Gilbert Ramirez <gram@verdict.uthscsa.edu>
* Much stuff added by Guy Harris <guy@netapp.com>
*
* $Id: packet-nbns.c,v 1.30 1999/10/07 09:21:38 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-dns.h"
#include "packet-netbios.h"
#include "util.h"
static int proto_nbns = -1;
static int proto_nbdgm = -1;
static int proto_nbss = -1;
/* Packet structure taken from RFC 1002. See also RFC 1001.
* Opcode, flags, and rcode treated as "flags", similarly to DNS,
* to make it easier to lift the dissection code from "packet-dns.c". */
/* Offsets of fields in the NBNS header. */
#define NBNS_ID 0
#define NBNS_FLAGS 2
#define NBNS_QUEST 4
#define NBNS_ANS 6
#define NBNS_AUTH 8
#define NBNS_ADD 10
/* Length of NBNS header. */
#define NBNS_HDRLEN 12
/* type values */
#define T_NB 32 /* NetBIOS name service RR */
#define T_NBSTAT 33 /* NetBIOS node status RR */
/* Bit fields in the flags */
#define F_RESPONSE (1<<15) /* packet is response */
#define F_OPCODE (0xF<<11) /* query opcode */
#define F_AUTHORITATIVE (1<<10) /* response is authoritative */
#define F_TRUNCATED (1<<9) /* response is truncated */
#define F_RECDESIRED (1<<8) /* recursion desired */
#define F_RECAVAIL (1<<7) /* recursion available */
#define F_BROADCAST (1<<4) /* broadcast/multicast packet */
#define F_RCODE (0xF<<0) /* reply code */
/* Opcodes */
#define OPCODE_QUERY (0<<11) /* standard query */
#define OPCODE_REGISTRATION (5<<11) /* registration */
#define OPCODE_RELEASE (6<<11) /* release name */
#define OPCODE_WACK (7<<11) /* wait for acknowledgement */
#define OPCODE_REFRESH (8<<11) /* refresh registration */
#define OPCODE_REFRESHALT (9<<11) /* refresh registration (alternate opcode) */
#define OPCODE_MHREGISTRATION (15<<11) /* multi-homed registration */
/* Reply codes */
#define RCODE_NOERROR (0<<0)
#define RCODE_FMTERROR (1<<0)
#define RCODE_SERVFAIL (2<<0)
#define RCODE_NAMEERROR (3<<0)
#define RCODE_NOTIMPL (4<<0)
#define RCODE_REFUSED (5<<0)
#define RCODE_ACTIVE (6<<0)
#define RCODE_CONFLICT (7<<0)
/* Values for the "NB_FLAGS" field of RR data. From RFC 1001 and 1002,
* except for NB_FLAGS_ONT_H_NODE, which was discovered by looking at
* packet traces. */
#define NB_FLAGS_ONT (3<<(15-2)) /* bits for node type */
#define NB_FLAGS_ONT_B_NODE (0<<(15-2)) /* B-mode node */
#define NB_FLAGS_ONT_P_NODE (1<<(15-2)) /* P-mode node */
#define NB_FLAGS_ONT_M_NODE (2<<(15-2)) /* M-mode node */
#define NB_FLAGS_ONT_H_NODE (3<<(15-2)) /* H-mode node */
#define NB_FLAGS_G (1<<(15-0)) /* group name */
/* Values for the "NAME_FLAGS" field of a NODE_NAME entry in T_NBSTAT
* RR data. From RFC 1001 and 1002, except for NAME_FLAGS_ONT_H_NODE,
* which was discovered by looking at packet traces. */
#define NAME_FLAGS_PRM (1<<(15-6)) /* name is permanent node name */
#define NAME_FLAGS_ACT (1<<(15-5)) /* name is active */
#define NAME_FLAGS_CNF (1<<(15-4)) /* name is in conflict */
#define NAME_FLAGS_DRG (1<<(15-3)) /* name is being deregistered */
#define NAME_FLAGS_ONT (3<<(15-2)) /* bits for node type */
#define NAME_FLAGS_ONT_B_NODE (0<<(15-2)) /* B-mode node */
#define NAME_FLAGS_ONT_P_NODE (1<<(15-2)) /* P-mode node */
#define NAME_FLAGS_ONT_M_NODE (2<<(15-2)) /* M-mode node */
#define NAME_FLAGS_G (1<<(15-0)) /* group name */
static const value_string opcode_vals[] = {
{ OPCODE_QUERY, "Name query" },
{ OPCODE_REGISTRATION, "Registration" },
{ OPCODE_RELEASE, "Release" },
{ OPCODE_WACK, "Wait for acknowledgment" },
{ OPCODE_REFRESH, "Refresh" },
{ OPCODE_REFRESHALT, "Refresh (alternate opcode)" },
{ OPCODE_MHREGISTRATION, "Multi-homed registration" },
{ 0, NULL }
};
static char *
nbns_type_name (int type)
{
switch (type) {
case T_NB:
return "NB";
case T_NBSTAT:
return "NBSTAT";
}
return "unknown";
}
static int
get_nbns_name(const u_char *pd, int offset, int nbns_data_offset,
char *name_ret, int *name_type_ret)
{
int name_len;
char name[MAXDNAME];
char nbname[NETBIOS_NAME_LEN];
char *pname, *pnbname, cname, cnbname;
int name_type;
name_len = get_dns_name(pd, offset, nbns_data_offset, name,
sizeof(name));
/* OK, now undo the first-level encoding. */
pname = &name[0];
pnbname = &nbname[0];
for (;;) {
/* Every two characters of the first level-encoded name
* turn into one character in the decoded name. */
cname = *pname;
if (cname == '\0')
break; /* no more characters */
if (cname == '.')
break; /* scope ID follows */
if (cname < 'A' || cname > 'Z') {
/* Not legal. */
strcpy(nbname,
"Illegal NetBIOS name (character not between A and Z in first-level encoding)");
goto bad;
}
cname -= 'A';
cnbname = cname << 4;
pname++;
cname = *pname;
if (cname == '\0' || cname == '.') {
/* No more characters in the name - but we're in
* the middle of a pair. Not legal. */
strcpy(nbname,
"Illegal NetBIOS name (odd number of bytes)");
goto bad;
}
if (cname < 'A' || cname > 'Z') {
/* Not legal. */
strcpy(nbname,
"Illegal NetBIOS name (character not between A and Z in first-level encoding)");
goto bad;
}
cname -= 'A';
cnbname |= cname;
pname++;
/* Do we have room to store the character? */
if (pnbname < &nbname[NETBIOS_NAME_LEN]) {
/* Yes - store the character. */
*pnbname = cnbname;
}
/* We bump the pointer even if it's past the end of the
name, so we keep track of how long the name is. */
pnbname++;
}
/* NetBIOS names are supposed to be exactly 16 bytes long. */
if (pnbname - nbname != NETBIOS_NAME_LEN) {
/* It's not. */
sprintf(nbname, "Illegal NetBIOS name (%ld bytes long)",
(long)(pnbname - nbname));
goto bad;
}
/* This one is; make its name printable. */
name_type = process_netbios_name(nbname, name_ret);
name_ret += strlen(name_ret);
sprintf(name_ret, "<%02x>", name_type);
name_ret += 4;
if (cname == '.') {
/* We have a scope ID, starting at "pname"; append that to
* the decoded host name. */
strcpy(name_ret, pname);
}
if (name_type_ret != NULL)
*name_type_ret = name_type;
return name_len;
bad:
if (name_type_ret != NULL)
*name_type_ret = -1;
strcpy (name_ret, nbname);
return name_len;
}
static int
get_nbns_name_type_class(const u_char *pd, int offset, int nbns_data_offset,
char *name_ret, int *name_len_ret, int *name_type_ret, int *type_ret,
int *class_ret)
{
int name_len;
int type;
int class;
name_len = get_nbns_name(pd, offset, nbns_data_offset, name_ret,
name_type_ret);
offset += name_len;
if (!BYTES_ARE_IN_FRAME(offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return -1;
}
type = pntohs(&pd[offset]);
offset += 2;
if (!BYTES_ARE_IN_FRAME(offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return -1;
}
class = pntohs(&pd[offset]);
*type_ret = type;
*class_ret = class;
*name_len_ret = name_len;
return name_len + 4;
}
static void
add_name_and_type(proto_tree *tree, int offset, int len, char *tag,
char *name, int name_type)
{
if (name_type != -1) {
proto_tree_add_text(tree, offset, len, "%s: %s (%s)",
tag, name, netbios_name_type_descr(name_type));
} else {
proto_tree_add_text(tree, offset, len, "%s: %s",
tag, name);
}
}
static int
dissect_nbns_query(const u_char *pd, int offset, int nbns_data_offset,
proto_tree *nbns_tree)
{
int len;
char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME];
int name_len;
int name_type;
int type;
int class;
char *class_name;
char *type_name;
const u_char *dptr;
const u_char *data_start;
proto_tree *q_tree;
proto_item *tq;
data_start = dptr = pd + offset;
len = get_nbns_name_type_class(pd, offset, nbns_data_offset, name,
&name_len, &name_type, &type, &class);
if (len < 0) {
/* We ran past the end of the data in the packet. */
return 0;
}
dptr += len;
type_name = nbns_type_name(type);
class_name = dns_class_name(class);
tq = proto_tree_add_text(nbns_tree, offset, len, "%s: type %s, class %s",
name, type_name, class_name);
q_tree = proto_item_add_subtree(tq, ETT_NBNS_QD);
add_name_and_type(q_tree, offset, name_len, "Name", name, name_type);
offset += name_len;
proto_tree_add_text(q_tree, offset, 2, "Type: %s", type_name);
offset += 2;
proto_tree_add_text(q_tree, offset, 2, "Class: %s", class_name);
offset += 2;
return dptr - data_start;
}
static void
nbns_add_nbns_flags(proto_tree *nbns_tree, int offset, u_short flags,
int is_wack)
{
char buf[128+1];
proto_tree *field_tree;
proto_item *tf;
static const value_string rcode_vals[] = {
{ RCODE_NOERROR, "No error" },
{ RCODE_FMTERROR, "Request was invalidly formatted" },
{ RCODE_SERVFAIL, "Server failure" },
{ RCODE_NAMEERROR, "Requested name does not exist" },
{ RCODE_NOTIMPL, "Request is not implemented" },
{ RCODE_REFUSED, "Request was refused" },
{ RCODE_ACTIVE, "Name is owned by another node" },
{ RCODE_CONFLICT, "Name is in conflict" },
{ 0, NULL }
};
strcpy(buf, val_to_str(flags & F_OPCODE, opcode_vals,
"Unknown operation"));
if (flags & F_RESPONSE && !is_wack) {
strcat(buf, " response");
strcat(buf, ", ");
strcat(buf, val_to_str(flags & F_RCODE, rcode_vals,
"Unknown error"));
}
tf = proto_tree_add_text(nbns_tree, offset, 2,
"Flags: 0x%04x (%s)", flags, buf);
field_tree = proto_item_add_subtree(tf, ETT_NBNS_FLAGS);
proto_tree_add_text(field_tree, offset, 2, "%s",
decode_boolean_bitfield(flags, F_RESPONSE,
2*8, "Response", "Query"));
proto_tree_add_text(field_tree, offset, 2, "%s",
decode_enumerated_bitfield(flags, F_OPCODE,
2*8, opcode_vals, "%s"));
if (flags & F_RESPONSE) {
proto_tree_add_text(field_tree, offset, 2,
"%s",
decode_boolean_bitfield(flags, F_AUTHORITATIVE,
2*8,
"Server is an authority for domain",
"Server isn't an authority for domain"));
}
proto_tree_add_text(field_tree, offset, 2, "%s",
decode_boolean_bitfield(flags, F_TRUNCATED,
2*8,
"Message is truncated",
"Message is not truncated"));
proto_tree_add_text(field_tree, offset, 2, "%s",
decode_boolean_bitfield(flags, F_RECDESIRED,
2*8,
"Do query recursively",
"Don't do query recursively"));
if (flags & F_RESPONSE) {
proto_tree_add_text(field_tree, offset, 2,
"%s",
decode_boolean_bitfield(flags, F_RECAVAIL,
2*8,
"Server can do recursive queries",
"Server can't do recursive queries"));
}
proto_tree_add_text(field_tree, offset, 2, "%s",
decode_boolean_bitfield(flags, F_BROADCAST,
2*8,
"Broadcast packet",
"Not a broadcast packet"));
if (flags & F_RESPONSE && !is_wack) {
proto_tree_add_text(field_tree, offset, 2,
"%s",
decode_enumerated_bitfield(flags, F_RCODE,
2*8,
rcode_vals, "%s"));
}
}
static void
nbns_add_nb_flags(proto_tree *rr_tree, int offset, u_short 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, 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, offset, 2, "%s",
decode_boolean_bitfield(flags, NB_FLAGS_G,
2*8,
"Group name",
"Unique name"));
proto_tree_add_text(field_tree, 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, int offset, u_short 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, 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, offset, 2, "%s",
decode_boolean_bitfield(flags, NAME_FLAGS_G,
2*8,
"Group name",
"Unique name"));
proto_tree_add_text(field_tree, offset, 2, "%s",
decode_enumerated_bitfield(flags, NAME_FLAGS_ONT,
2*8, name_flags_ont_vals, "%s"));
proto_tree_add_text(field_tree, 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, 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, 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, offset, 2, "%s",
decode_boolean_bitfield(flags, NAME_FLAGS_PRM,
2*8,
"Permanent node name",
"Not permanent node name"));
}
static int
dissect_nbns_answer(const u_char *pd, int offset, int nbns_data_offset,
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;
const u_char *dptr;
int cur_offset;
const u_char *data_start;
u_int ttl;
u_short data_len;
u_short flags;
proto_tree *rr_tree;
proto_item *trr;
char name_str[(NETBIOS_NAME_LEN - 1)*4 + 1];
data_start = dptr = pd + offset;
cur_offset = offset;
len = get_nbns_name_type_class(pd, offset, nbns_data_offset, name,
&name_len, &name_type, &type, &class);
if (len < 0) {
/* We ran past the end of the data in the packet. */
return 0;
}
dptr += len;
cur_offset += len;
type_name = nbns_type_name(type);
class_name = dns_class_name(class);
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
ttl = pntohl(dptr);
dptr += 4;
cur_offset += 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured data in the packet. */
return 0;
}
data_len = pntohs(dptr);
dptr += 2;
cur_offset += 2;
switch (type) {
case T_NB: /* "NB" record */
trr = proto_tree_add_text(nbns_tree, offset,
(dptr - 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, 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 (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
flags = pntohs(dptr);
dptr += 2;
nbns_add_nbns_flags(rr_tree, cur_offset,
flags, 1);
cur_offset += 2;
data_len -= 2;
} else {
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
flags = pntohs(dptr);
dptr += 2;
nbns_add_nb_flags(rr_tree, cur_offset, flags);
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 4) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 4,
"Addr: %s",
ip_to_str((guint8 *)dptr));
dptr += 4;
cur_offset += 4;
data_len -= 4;
}
}
break;
case T_NBSTAT: /* "NBSTAT" record */
{
u_int num_names;
char nbname[16+4+1]; /* 4 for [<last char>] */
u_short name_flags;
trr = proto_tree_add_text(nbns_tree, offset,
(dptr - data_start) + data_len,
"%s: type %s, class %s",
name, type_name, class_name);
rr_tree = add_rr_to_tree(trr, ETT_NBNS_RR, offset, name,
name_len, type_name, class_name, ttl, data_len);
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 1) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
num_names = *dptr;
dptr += 1;
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of names: %u", num_names);
cur_offset += 1;
while (num_names != 0) {
if (!BYTES_ARE_IN_FRAME(cur_offset, NETBIOS_NAME_LEN)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < NETBIOS_NAME_LEN) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
goto out;
}
memcpy(nbname, dptr, NETBIOS_NAME_LEN);
dptr += NETBIOS_NAME_LEN;
name_type = process_netbios_name(nbname,
name_str);
proto_tree_add_text(rr_tree, 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 (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
goto out;
}
name_flags = pntohs(dptr);
dptr += 2;
nbns_add_name_flags(rr_tree, cur_offset, name_flags);
cur_offset += 2;
data_len -= 2;
num_names--;
}
if (!BYTES_ARE_IN_FRAME(cur_offset, 6)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 6) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 6,
"Unit ID: %s",
ether_to_str((guint8 *)dptr));
dptr += 6;
cur_offset += 6;
data_len -= 6;
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 1) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 1,
"Jumpers: 0x%x", *dptr);
dptr += 1;
cur_offset += 1;
data_len -= 1;
if (!BYTES_ARE_IN_FRAME(cur_offset, 1)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 1) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 1,
"Test result: 0x%x", *dptr);
dptr += 1;
cur_offset += 1;
data_len -= 1;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Version number: 0x%x", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Period of statistics: 0x%x", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of CRCs: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of alignment errors: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of collisions: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of send aborts: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 4) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 4,
"Number of good sends: %u", pntohl(dptr));
dptr += 4;
cur_offset += 4;
data_len -= 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 4)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 4) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 4,
"Number of good receives: %u", pntohl(dptr));
dptr += 4;
cur_offset += 4;
data_len -= 4;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of retransmits: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of no resource conditions: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of command blocks: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Number of pending sessions: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Max number of pending sessions: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Max total sessions possible: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
if (!BYTES_ARE_IN_FRAME(cur_offset, 2)) {
/* We ran past the end of the captured
data in the packet. */
return 0;
}
if (data_len < 2) {
proto_tree_add_text(rr_tree, cur_offset,
data_len, "(incomplete entry)");
break;
}
proto_tree_add_text(rr_tree, cur_offset, 2,
"Session data packet size: %u", pntohs(dptr));
dptr += 2;
cur_offset += 2;
data_len -= 2;
}
out:
break;
default:
trr = proto_tree_add_text(nbns_tree, offset,
(dptr - data_start) + data_len,
"%s: type %s, class %s",
name, type_name, class_name);
rr_tree = add_rr_to_tree(trr, ETT_NBNS_RR, offset, name,
name_len, type_name, class_name, ttl, data_len);
proto_tree_add_text(rr_tree, cur_offset, data_len, "Data");
break;
}
dptr += data_len;
return dptr - data_start;