2 * Routines for NetBIOS-over-TCP packet disassembly (the name dates back
3 * to when it had only NBNS)
4 * Guy Harris <guy@alum.mit.edu>
6 * $Id: packet-nbns.c,v 1.80 2002/09/12 00:10:58 tpot Exp $
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@ethereal.com>
10 * Copyright 1998 Gerald Combs
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
35 #include <epan/packet.h>
36 #include "packet-dns.h"
37 #include "packet-netbios.h"
38 #include "packet-tcp.h"
39 #include "packet-frame.h"
42 static int proto_nbns = -1;
43 static int hf_nbns_flags = -1;
44 static int hf_nbns_flags_response = -1;
45 static int hf_nbns_flags_opcode = -1;
46 static int hf_nbns_flags_authoritative = -1;
47 static int hf_nbns_flags_truncated = -1;
48 static int hf_nbns_flags_recdesired = -1;
49 static int hf_nbns_flags_recavail = -1;
50 static int hf_nbns_flags_broadcast = -1;
51 static int hf_nbns_flags_rcode = -1;
52 static int hf_nbns_transaction_id = -1;
53 static int hf_nbns_count_questions = -1;
54 static int hf_nbns_count_answers = -1;
55 static int hf_nbns_count_auth_rr = -1;
56 static int hf_nbns_count_add_rr = -1;
58 static gint ett_nbns = -1;
59 static gint ett_nbns_qd = -1;
60 static gint ett_nbns_flags = -1;
61 static gint ett_nbns_nb_flags = -1;
62 static gint ett_nbns_name_flags = -1;
63 static gint ett_nbns_rr = -1;
64 static gint ett_nbns_qry = -1;
65 static gint ett_nbns_ans = -1;
67 static int proto_nbdgm = -1;
68 static int hf_nbdgm_type = -1;
69 static int hf_nbdgm_fragment = -1;
70 static int hf_nbdgm_first = -1;
71 static int hf_nbdgm_node_type = -1;
72 static int hf_nbdgm_datagram_id = -1;
73 static int hf_nbdgm_src_ip = -1;
74 static int hf_nbdgm_src_port = -1;
76 static gint ett_nbdgm = -1;
78 static int proto_nbss = -1;
79 static int hf_nbss_type = -1;
80 static int hf_nbss_flags = -1;
82 static gint ett_nbss = -1;
83 static gint ett_nbss_flags = -1;
85 /* desegmentation of NBSS over TCP */
86 static gboolean nbss_desegment = TRUE;
88 /* See RFC 1001 and 1002 for information on the first three, and see
90 http://www.cifs.com/specs/draft-leach-cifs-v1-spec-01.txt
92 Appendix B, and various messages on the CIFS mailing list such as
94 http://discuss.microsoft.com/SCRIPTS/WA-MSD.EXE?A2=ind9811A&L=cifs&P=R386
96 for information on the fourth. */
97 #define UDP_PORT_NBNS 137
98 #define UDP_PORT_NBDGM 138
99 #define TCP_PORT_NBSS 139
100 #define TCP_PORT_CIFS 445
102 /* Packet structure taken from RFC 1002. See also RFC 1001.
103 * Opcode, flags, and rcode treated as "flags", similarly to DNS,
104 * to make it easier to lift the dissection code from "packet-dns.c". */
106 /* Offsets of fields in the NBNS header. */
114 /* Length of NBNS header. */
115 #define NBNS_HDRLEN 12
118 #define T_NB 32 /* NetBIOS name service RR */
119 #define T_NBSTAT 33 /* NetBIOS node status RR */
121 /* Bit fields in the flags */
122 #define F_RESPONSE (1<<15) /* packet is response */
123 #define F_OPCODE (0xF<<11) /* query opcode */
124 #define OPCODE_SHIFT 11
125 #define F_AUTHORITATIVE (1<<10) /* response is authoritative */
126 #define F_TRUNCATED (1<<9) /* response is truncated */
127 #define F_RECDESIRED (1<<8) /* recursion desired */
128 #define F_RECAVAIL (1<<7) /* recursion available */
129 #define F_BROADCAST (1<<4) /* broadcast/multicast packet */
130 #define F_RCODE (0xF<<0) /* reply code */
132 static const true_false_string tfs_flags_response = {
133 "Message is a response",
137 static const true_false_string tfs_flags_authoritative = {
138 "Server is an authority for domain",
139 "Server is not an authority for domain"
142 static const true_false_string tfs_flags_truncated = {
143 "Message is truncated",
144 "Message is not truncated"
147 static const true_false_string tfs_flags_recdesired = {
148 "Do query recursively",
149 "Don't do query recursively"
152 static const true_false_string tfs_flags_recavail = {
153 "Server can do recursive queries",
154 "Server can't do recursive queries"
157 static const true_false_string tfs_flags_broadcast = {
159 "Not a broadcast packet"
163 #define OPCODE_QUERY 0 /* standard query */
164 #define OPCODE_REGISTRATION 5 /* registration */
165 #define OPCODE_RELEASE 6 /* release name */
166 #define OPCODE_WACK 7 /* wait for acknowledgement */
167 #define OPCODE_REFRESH 8 /* refresh registration */
168 #define OPCODE_REFRESHALT 9 /* refresh registration (alternate opcode) */
169 #define OPCODE_MHREGISTRATION 15 /* multi-homed registration */
171 static const value_string opcode_vals[] = {
172 { OPCODE_QUERY, "Name query" },
173 { OPCODE_REGISTRATION, "Registration" },
174 { OPCODE_RELEASE, "Release" },
175 { OPCODE_WACK, "Wait for acknowledgment" },
176 { OPCODE_REFRESH, "Refresh" },
177 { OPCODE_REFRESHALT, "Refresh (alternate opcode)" },
178 { OPCODE_MHREGISTRATION, "Multi-homed registration" },
183 #define RCODE_NOERROR 0
184 #define RCODE_FMTERROR 1
185 #define RCODE_SERVFAIL 2
186 #define RCODE_NAMEERROR 3
187 #define RCODE_NOTIMPL 4
188 #define RCODE_REFUSED 5
189 #define RCODE_ACTIVE 6
190 #define RCODE_CONFLICT 7
192 static const value_string rcode_vals[] = {
193 { RCODE_NOERROR, "No error" },
194 { RCODE_FMTERROR, "Request was invalidly formatted" },
195 { RCODE_SERVFAIL, "Server failure" },
196 { RCODE_NAMEERROR, "Requested name does not exist" },
197 { RCODE_NOTIMPL, "Request is not implemented" },
198 { RCODE_REFUSED, "Request was refused" },
199 { RCODE_ACTIVE, "Name is owned by another node" },
200 { RCODE_CONFLICT, "Name is in conflict" },
204 /* Values for the "NB_FLAGS" field of RR data. From RFC 1001 and 1002,
205 * except for NB_FLAGS_ONT_H_NODE, which was discovered by looking at
207 #define NB_FLAGS_ONT (3<<(15-2)) /* bits for node type */
208 #define NB_FLAGS_ONT_B_NODE (0<<(15-2)) /* B-mode node */
209 #define NB_FLAGS_ONT_P_NODE (1<<(15-2)) /* P-mode node */
210 #define NB_FLAGS_ONT_M_NODE (2<<(15-2)) /* M-mode node */
211 #define NB_FLAGS_ONT_H_NODE (3<<(15-2)) /* H-mode node */
213 #define NB_FLAGS_G (1<<(15-0)) /* group name */
215 /* Values for the "NAME_FLAGS" field of a NODE_NAME entry in T_NBSTAT
216 * RR data. From RFC 1001 and 1002, except for NAME_FLAGS_ONT_H_NODE,
217 * which was discovered by looking at packet traces. */
218 #define NAME_FLAGS_PRM (1<<(15-6)) /* name is permanent node name */
220 #define NAME_FLAGS_ACT (1<<(15-5)) /* name is active */
222 #define NAME_FLAGS_CNF (1<<(15-4)) /* name is in conflict */
224 #define NAME_FLAGS_DRG (1<<(15-3)) /* name is being deregistered */
226 #define NAME_FLAGS_ONT (3<<(15-2)) /* bits for node type */
227 #define NAME_FLAGS_ONT_B_NODE (0<<(15-2)) /* B-mode node */
228 #define NAME_FLAGS_ONT_P_NODE (1<<(15-2)) /* P-mode node */
229 #define NAME_FLAGS_ONT_M_NODE (2<<(15-2)) /* M-mode node */
231 #define NAME_FLAGS_G (1<<(15-0)) /* group name */
234 nbns_type_name (int type)
246 #define NBNAME_BUF_LEN 128
249 get_nbns_name(tvbuff_t *tvb, int offset, int nbns_data_offset,
250 char *name_ret, int *name_type_ret)
254 char nbname[NBNAME_BUF_LEN];
255 char *pname, *pnbname, cname, cnbname;
258 name_len = get_dns_name(tvb, offset, nbns_data_offset, name,
261 /* OK, now undo the first-level encoding. */
263 pnbname = &nbname[0];
265 /* Every two characters of the first level-encoded name
266 * turn into one character in the decoded name. */
269 break; /* no more characters */
271 break; /* scope ID follows */
272 if (cname < 'A' || cname > 'Z') {
275 "Illegal NetBIOS name (character not between A and Z in first-level encoding)");
279 cnbname = cname << 4;
283 if (cname == '\0' || cname == '.') {
284 /* No more characters in the name - but we're in
285 * the middle of a pair. Not legal. */
287 "Illegal NetBIOS name (odd number of bytes)");
290 if (cname < 'A' || cname > 'Z') {
293 "Illegal NetBIOS name (character not between A and Z in first-level encoding)");
300 /* Do we have room to store the character? */
301 if (pnbname < &nbname[NETBIOS_NAME_LEN]) {
302 /* Yes - store the character. */
306 /* We bump the pointer even if it's past the end of the
307 name, so we keep track of how long the name is. */
311 /* NetBIOS names are supposed to be exactly 16 bytes long. */
312 if (pnbname - nbname != NETBIOS_NAME_LEN) {
314 sprintf(nbname, "Illegal NetBIOS name (%ld bytes long)",
315 (long)(pnbname - nbname));
319 /* This one is; make its name printable. */
320 name_type = process_netbios_name(nbname, name_ret);
321 name_ret += strlen(name_ret);
322 sprintf(name_ret, "<%02x>", name_type);
325 /* We have a scope ID, starting at "pname"; append that to
326 * the decoded host name. */
327 strcpy(name_ret, pname);
329 if (name_type_ret != NULL)
330 *name_type_ret = name_type;
334 if (name_type_ret != NULL)
336 strcpy (name_ret, nbname);
342 get_nbns_name_type_class(tvbuff_t *tvb, int offset, int nbns_data_offset,
343 char *name_ret, int *name_len_ret, int *name_type_ret, int *type_ret,
350 name_len = get_nbns_name(tvb, offset, nbns_data_offset, name_ret,
354 type = tvb_get_ntohs(tvb, offset);
357 class = tvb_get_ntohs(tvb, offset);
361 *name_len_ret = name_len;
367 add_name_and_type(proto_tree *tree, tvbuff_t *tvb, int offset, int len,
368 char *tag, char *name, int name_type)
370 if (name_type != -1) {
371 proto_tree_add_text(tree, tvb, offset, len, "%s: %s (%s)",
372 tag, name, netbios_name_type_descr(name_type));
374 proto_tree_add_text(tree, tvb, offset, len, "%s: %s",
380 dissect_nbns_query(tvbuff_t *tvb, int offset, int nbns_data_offset,
381 column_info *cinfo, proto_tree *nbns_tree)
384 char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME];
396 data_start = data_offset = offset;
398 len = get_nbns_name_type_class(tvb, offset, nbns_data_offset, name,
399 &name_len, &name_type, &type, &class);
402 type_name = nbns_type_name(type);
403 class_name = dns_class_name(class);
406 col_append_fstr(cinfo, COL_INFO, " %s %s", type_name, name);
407 if (nbns_tree != NULL) {
408 tq = proto_tree_add_text(nbns_tree, tvb, offset, len,
409 "%s: type %s, class %s", name, type_name, class_name);
410 q_tree = proto_item_add_subtree(tq, ett_nbns_qd);
412 add_name_and_type(q_tree, tvb, offset, name_len, "Name", name,
416 proto_tree_add_text(q_tree, tvb, offset, 2, "Type: %s", type_name);
419 proto_tree_add_text(q_tree, tvb, offset, 2, "Class: %s", class_name);
423 return data_offset - data_start;
427 nbns_add_nbns_flags(column_info *cinfo, proto_tree *nbns_tree, tvbuff_t *tvb, int offset,
428 gushort flags, int is_wack)
432 proto_tree *field_tree;
435 opcode = (flags & F_OPCODE) >> OPCODE_SHIFT;
436 strcpy(buf, val_to_str(opcode, opcode_vals, "Unknown operation"));
437 if (flags & F_RESPONSE && !is_wack) {
438 strcat(buf, " response");
440 strcat(buf, val_to_str(flags & F_RCODE, rcode_vals,
443 if ((flags & F_RCODE) && check_col(cinfo, COL_INFO))
444 col_append_fstr(cinfo, COL_INFO, ", %s",
445 val_to_str(flags & F_RCODE, rcode_vals,
448 tf = proto_tree_add_uint_format(nbns_tree, hf_nbns_flags,
449 tvb, offset, 2, flags, "Flags: 0x%04x (%s)", flags, buf);
450 field_tree = proto_item_add_subtree(tf, ett_nbns_flags);
451 proto_tree_add_item(field_tree, hf_nbns_flags_response,
452 tvb, offset, 2, FALSE);
453 proto_tree_add_item(field_tree, hf_nbns_flags_opcode,
454 tvb, offset, 2, FALSE);
455 if (flags & F_RESPONSE) {
456 proto_tree_add_item(field_tree, hf_nbns_flags_authoritative,
457 tvb, offset, 2, FALSE);
459 proto_tree_add_item(field_tree, hf_nbns_flags_truncated,
460 tvb, offset, 2, FALSE);
461 proto_tree_add_item(field_tree, hf_nbns_flags_recdesired,
462 tvb, offset, 2, FALSE);
463 if (flags & F_RESPONSE) {
464 proto_tree_add_item(field_tree, hf_nbns_flags_recavail,
465 tvb, offset, 2, FALSE);
467 proto_tree_add_item(field_tree, hf_nbns_flags_broadcast,
468 tvb, offset, 2, FALSE);
469 if (flags & F_RESPONSE && !is_wack) {
470 proto_tree_add_item(field_tree, hf_nbns_flags_rcode,
471 tvb, offset, 2, FALSE);
476 nbns_add_nb_flags(proto_tree *rr_tree, tvbuff_t *tvb, int offset, gushort flags)
479 proto_tree *field_tree;
481 static const value_string nb_flags_ont_vals[] = {
482 { NB_FLAGS_ONT_B_NODE, "B-node" },
483 { NB_FLAGS_ONT_P_NODE, "P-node" },
484 { NB_FLAGS_ONT_M_NODE, "M-node" },
485 { NB_FLAGS_ONT_H_NODE, "H-node" },
489 strcpy(buf, val_to_str(flags & NB_FLAGS_ONT, nb_flags_ont_vals,
492 if (flags & NB_FLAGS_G)
493 strcat(buf, "group");
495 strcat(buf, "unique");
496 tf = proto_tree_add_text(rr_tree, tvb, offset, 2, "Flags: 0x%x (%s)", flags,
498 field_tree = proto_item_add_subtree(tf, ett_nbns_nb_flags);
499 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
500 decode_boolean_bitfield(flags, NB_FLAGS_G,
504 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
505 decode_enumerated_bitfield(flags, NB_FLAGS_ONT,
506 2*8, nb_flags_ont_vals, "%s"));
510 nbns_add_name_flags(proto_tree *rr_tree, tvbuff_t *tvb, int offset,
514 proto_item *field_tree;
516 static const value_string name_flags_ont_vals[] = {
517 { NAME_FLAGS_ONT_B_NODE, "B-node" },
518 { NAME_FLAGS_ONT_P_NODE, "P-node" },
519 { NAME_FLAGS_ONT_M_NODE, "M-node" },
523 strcpy(buf, val_to_str(flags & NAME_FLAGS_ONT, name_flags_ont_vals,
526 if (flags & NAME_FLAGS_G)
527 strcat(buf, "group");
529 strcat(buf, "unique");
530 if (flags & NAME_FLAGS_DRG)
531 strcat(buf, ", being deregistered");
532 if (flags & NAME_FLAGS_CNF)
533 strcat(buf, ", in conflict");
534 if (flags & NAME_FLAGS_ACT)
535 strcat(buf, ", active");
536 if (flags & NAME_FLAGS_PRM)
537 strcat(buf, ", permanent node name");
538 tf = proto_tree_add_text(rr_tree, tvb, offset, 2, "Name flags: 0x%x (%s)",
540 field_tree = proto_item_add_subtree(tf, ett_nbns_name_flags);
541 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
542 decode_boolean_bitfield(flags, NAME_FLAGS_G,
546 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
547 decode_enumerated_bitfield(flags, NAME_FLAGS_ONT,
548 2*8, name_flags_ont_vals, "%s"));
549 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
550 decode_boolean_bitfield(flags, NAME_FLAGS_DRG,
552 "Name is being deregistered",
553 "Name is not being deregistered"));
554 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
555 decode_boolean_bitfield(flags, NAME_FLAGS_CNF,
557 "Name is in conflict",
558 "Name is not in conflict"));
559 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
560 decode_boolean_bitfield(flags, NAME_FLAGS_ACT,
563 "Name is not active"));
564 proto_tree_add_text(field_tree, tvb, offset, 2, "%s",
565 decode_boolean_bitfield(flags, NAME_FLAGS_PRM,
567 "Permanent node name",
568 "Not permanent node name"));
572 dissect_nbns_answer(tvbuff_t *tvb, int offset, int nbns_data_offset,
573 column_info *cinfo, proto_tree *nbns_tree, int opcode)
576 char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME + 64];
591 char name_str[(NETBIOS_NAME_LEN - 1)*4 + 1];
593 char nbname[16+4+1]; /* 4 for [<last char>] */
596 data_start = data_offset = offset;
599 len = get_nbns_name_type_class(tvb, offset, nbns_data_offset, name,
600 &name_len, &name_type, &type, &class);
604 type_name = nbns_type_name(type);
605 class_name = dns_class_name(class);
607 ttl = tvb_get_ntohl(tvb, data_offset);
611 data_len = tvb_get_ntohs(tvb, data_offset);
616 case T_NB: /* "NB" record */
618 if (opcode != OPCODE_WACK) {
619 col_append_fstr(cinfo, COL_INFO, " %s %s",
621 ip_to_str(tvb_get_ptr(tvb, data_offset+2, 4)));
624 if (nbns_tree == NULL)
626 trr = proto_tree_add_text(nbns_tree, tvb, offset,
627 (data_offset - data_start) + data_len,
628 "%s: type %s, class %s",
629 name, type_name, class_name);
631 strcat(name, netbios_name_type_descr(name_type));
633 rr_tree = add_rr_to_tree(trr, ett_nbns_rr, tvb, offset, name,
634 name_len, type_name, class_name, ttl, data_len);
635 while (data_len > 0) {
636 if (opcode == OPCODE_WACK) {
637 /* WACK response. This doesn't contain the
638 * same type of RR data as other T_NB
641 proto_tree_add_text(rr_tree, tvb, cur_offset,
642 data_len, "(incomplete entry)");
645 flags = tvb_get_ntohs(tvb, cur_offset);
646 nbns_add_nbns_flags(cinfo, rr_tree, tvb, cur_offset,
652 proto_tree_add_text(rr_tree, tvb, cur_offset,
653 data_len, "(incomplete entry)");
656 flags = tvb_get_ntohs(tvb, cur_offset);
657 nbns_add_nb_flags(rr_tree, tvb, cur_offset,
663 proto_tree_add_text(rr_tree, tvb, cur_offset,
664 data_len, "(incomplete entry)");
667 proto_tree_add_text(rr_tree, tvb, cur_offset, 4,
669 ip_to_str(tvb_get_ptr(tvb, cur_offset, 4)));
676 case T_NBSTAT: /* "NBSTAT" record */
678 col_append_fstr(cinfo, COL_INFO, " %s", type_name);
679 if (nbns_tree == NULL)
681 trr = proto_tree_add_text(nbns_tree, tvb, offset,
682 (data_offset - data_start) + data_len,
683 "%s: type %s, class %s",
684 name, type_name, class_name);
685 rr_tree = add_rr_to_tree(trr, ett_nbns_rr, tvb, offset, name,
686 name_len, type_name, class_name, ttl, data_len);
688 proto_tree_add_text(rr_tree, tvb, cur_offset,
689 data_len, "(incomplete entry)");
692 num_names = tvb_get_guint8(tvb, cur_offset);
693 proto_tree_add_text(rr_tree, tvb, cur_offset, 1,
694 "Number of names: %u", num_names);
697 while (num_names != 0) {
698 if (data_len < NETBIOS_NAME_LEN) {
699 proto_tree_add_text(rr_tree, tvb, cur_offset,
700 data_len, "(incomplete entry)");
703 tvb_memcpy(tvb, (guint8 *)nbname, cur_offset,
705 name_type = process_netbios_name(nbname,
707 proto_tree_add_text(rr_tree, tvb, cur_offset,
708 NETBIOS_NAME_LEN, "Name: %s<%02x> (%s)",
710 netbios_name_type_descr(name_type));
711 cur_offset += NETBIOS_NAME_LEN;
712 data_len -= NETBIOS_NAME_LEN;
715 proto_tree_add_text(rr_tree, tvb, cur_offset,
716 data_len, "(incomplete entry)");
719 name_flags = tvb_get_ntohs(tvb, cur_offset);
720 nbns_add_name_flags(rr_tree, tvb, cur_offset,
729 proto_tree_add_text(rr_tree, tvb, cur_offset,
730 data_len, "(incomplete entry)");
733 proto_tree_add_text(rr_tree, tvb, cur_offset, 6,
735 ether_to_str(tvb_get_ptr(tvb, cur_offset, 6)));
740 proto_tree_add_text(rr_tree, tvb, cur_offset,
741 data_len, "(incomplete entry)");
744 proto_tree_add_text(rr_tree, tvb, cur_offset, 1,
745 "Jumpers: 0x%x", tvb_get_guint8(tvb, cur_offset));
750 proto_tree_add_text(rr_tree, tvb, cur_offset,
751 data_len, "(incomplete entry)");
754 proto_tree_add_text(rr_tree, tvb, cur_offset, 1,
755 "Test result: 0x%x", tvb_get_guint8(tvb, cur_offset));
760 proto_tree_add_text(rr_tree, tvb, cur_offset,
761 data_len, "(incomplete entry)");
764 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
765 "Version number: 0x%x", tvb_get_ntohs(tvb, cur_offset));
770 proto_tree_add_text(rr_tree, tvb, cur_offset,
771 data_len, "(incomplete entry)");
774 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
775 "Period of statistics: 0x%x",
776 tvb_get_ntohs(tvb, cur_offset));
781 proto_tree_add_text(rr_tree, tvb, cur_offset,
782 data_len, "(incomplete entry)");
785 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
786 "Number of CRCs: %u", tvb_get_ntohs(tvb, cur_offset));
791 proto_tree_add_text(rr_tree, tvb, cur_offset,
792 data_len, "(incomplete entry)");
795 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
796 "Number of alignment errors: %u",
797 tvb_get_ntohs(tvb, cur_offset));
802 proto_tree_add_text(rr_tree, tvb, cur_offset,
803 data_len, "(incomplete entry)");
806 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
807 "Number of collisions: %u", tvb_get_ntohs(tvb, cur_offset));
812 proto_tree_add_text(rr_tree, tvb, cur_offset,
813 data_len, "(incomplete entry)");
816 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
817 "Number of send aborts: %u", tvb_get_ntohs(tvb, cur_offset));
822 proto_tree_add_text(rr_tree, tvb, cur_offset,
823 data_len, "(incomplete entry)");
826 proto_tree_add_text(rr_tree, tvb, cur_offset, 4,
827 "Number of good sends: %u", tvb_get_ntohl(tvb, cur_offset));
832 proto_tree_add_text(rr_tree, tvb, cur_offset,
833 data_len, "(incomplete entry)");
836 proto_tree_add_text(rr_tree, tvb, cur_offset, 4,
837 "Number of good receives: %u",
838 tvb_get_ntohl(tvb, cur_offset));
843 proto_tree_add_text(rr_tree, tvb, cur_offset,
844 data_len, "(incomplete entry)");
847 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
848 "Number of retransmits: %u", tvb_get_ntohs(tvb, cur_offset));
853 proto_tree_add_text(rr_tree, tvb, cur_offset,
854 data_len, "(incomplete entry)");
857 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
858 "Number of no resource conditions: %u",
859 tvb_get_ntohs(tvb, cur_offset));
864 proto_tree_add_text(rr_tree, tvb, cur_offset,
865 data_len, "(incomplete entry)");
868 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
869 "Number of command blocks: %u",
870 tvb_get_ntohs(tvb, cur_offset));
875 proto_tree_add_text(rr_tree, tvb, cur_offset,
876 data_len, "(incomplete entry)");
879 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
880 "Number of pending sessions: %u",
881 tvb_get_ntohs(tvb, cur_offset));
886 proto_tree_add_text(rr_tree, tvb, cur_offset,
887 data_len, "(incomplete entry)");
890 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
891 "Max number of pending sessions: %u",
892 tvb_get_ntohs(tvb, cur_offset));
897 proto_tree_add_text(rr_tree, tvb, cur_offset,
898 data_len, "(incomplete entry)");
901 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
902 "Max total sessions possible: %u",
903 tvb_get_ntohs(tvb, cur_offset));
908 proto_tree_add_text(rr_tree, tvb, cur_offset,
909 data_len, "(incomplete entry)");
912 proto_tree_add_text(rr_tree, tvb, cur_offset, 2,
913 "Session data packet size: %u",
914 tvb_get_ntohs(tvb, cur_offset));
922 col_append_fstr(cinfo, COL_INFO, " %s", type_name);
923 if (nbns_tree == NULL)
925 trr = proto_tree_add_text(nbns_tree, tvb, offset,
926 (data_offset - data_start) + data_len,
927 "%s: type %s, class %s",
928 name, type_name, class_name);
929 rr_tree = add_rr_to_tree(trr, ett_nbns_rr, tvb, offset, name,
930 name_len, type_name, class_name, ttl, data_len);
931 proto_tree_add_text(rr_tree, tvb, cur_offset, data_len, "Data");
932 cur_offset += data_len;
936 return cur_offset - data_start;
940 dissect_query_records(tvbuff_t *tvb, int cur_off, int nbns_data_offset,
941 int count, column_info *cinfo, proto_tree *nbns_tree)
943 int start_off, add_off;
944 proto_tree *qatree = NULL;
945 proto_item *ti = NULL;
948 if (nbns_tree != NULL) {
949 ti = proto_tree_add_text(nbns_tree, tvb, start_off, -1, "Queries");
950 qatree = proto_item_add_subtree(ti, ett_nbns_qry);
952 while (count-- > 0) {
953 add_off = dissect_nbns_query(tvb, cur_off, nbns_data_offset,
958 proto_item_set_len(ti, cur_off - start_off);
960 return cur_off - start_off;
966 dissect_answer_records(tvbuff_t *tvb, int cur_off, int nbns_data_offset,
967 int count, column_info *cinfo, proto_tree *nbns_tree, int opcode,
970 int start_off, add_off;
971 proto_tree *qatree = NULL;
972 proto_item *ti = NULL;
975 if (nbns_tree != NULL) {
976 ti = proto_tree_add_text(nbns_tree, tvb, start_off, -1, name);
977 qatree = proto_item_add_subtree(ti, ett_nbns_ans);
979 while (count-- > 0) {
980 add_off = dissect_nbns_answer(tvb, cur_off, nbns_data_offset,
981 cinfo, qatree, opcode);
985 proto_item_set_len(ti, cur_off - start_off);
986 return cur_off - start_off;
990 dissect_nbns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
993 int nbns_data_offset;
995 proto_tree *nbns_tree = NULL;
997 guint16 id, flags, opcode, rcode, quest, ans, auth, add;
1000 nbns_data_offset = offset;
1002 if (check_col(pinfo->cinfo, COL_PROTOCOL))
1003 col_set_str(pinfo->cinfo, COL_PROTOCOL, "NBNS");
1004 if (check_col(pinfo->cinfo, COL_INFO))
1005 col_clear(pinfo->cinfo, COL_INFO);
1007 /* To do: check for runts, errs, etc. */
1008 id = tvb_get_ntohs(tvb, offset + NBNS_ID);
1009 flags = tvb_get_ntohs(tvb, offset + NBNS_FLAGS);
1010 opcode = (flags & F_OPCODE) >> OPCODE_SHIFT;
1011 rcode = (flags & F_RCODE);
1013 if (check_col(pinfo->cinfo, COL_INFO)) {
1014 col_add_fstr(pinfo->cinfo, COL_INFO, "%s%s",
1015 val_to_str(opcode, opcode_vals, "Unknown operation (%u)"),
1016 (flags & F_RESPONSE) ? " response" : "");
1017 cinfo = pinfo->cinfo;
1019 /* Set "cinfo" to NULL; we pass a NULL "cinfo" to the query
1020 and answer dissectors, as a way of saying that they
1021 shouldn't add stuff to the COL_INFO column (a call to
1022 "check_col(cinfo, COL_INFO)" is more expensive than
1023 a check that a pointer isn't NULL). */
1028 ti = proto_tree_add_item(tree, proto_nbns, tvb, offset, -1,
1030 nbns_tree = proto_item_add_subtree(ti, ett_nbns);
1032 proto_tree_add_uint(nbns_tree, hf_nbns_transaction_id, tvb,
1033 offset + NBNS_ID, 2, id);
1035 nbns_add_nbns_flags(pinfo->cinfo, nbns_tree, tvb, offset + NBNS_FLAGS,
1038 quest = tvb_get_ntohs(tvb, offset + NBNS_QUEST);
1040 proto_tree_add_uint(nbns_tree, hf_nbns_count_questions, tvb,
1041 offset + NBNS_QUEST, 2, quest);
1043 ans = tvb_get_ntohs(tvb, offset + NBNS_ANS);
1045 proto_tree_add_uint(nbns_tree, hf_nbns_count_answers, tvb,
1046 offset + NBNS_ANS, 2, ans);
1048 auth = tvb_get_ntohs(tvb, offset + NBNS_AUTH);
1050 proto_tree_add_uint(nbns_tree, hf_nbns_count_auth_rr, tvb,
1051 offset + NBNS_AUTH, 2, auth);
1053 add = tvb_get_ntohs(tvb, offset + NBNS_ADD);
1055 proto_tree_add_uint(nbns_tree, hf_nbns_count_add_rr, tvb,
1056 offset + NBNS_ADD, 2, add);
1059 cur_off = offset + NBNS_HDRLEN;
1062 /* If this is a response, don't add information about the
1063 queries to the summary, just add information about the
1065 cur_off += dissect_query_records(tvb, cur_off,
1066 nbns_data_offset, quest,
1067 (!(flags & F_RESPONSE) ? cinfo : NULL), nbns_tree);
1071 /* If this is a request, don't add information about the
1072 answers to the summary, just add information about the
1074 cur_off += dissect_answer_records(tvb, cur_off,
1075 nbns_data_offset, ans,
1076 ((flags & F_RESPONSE) ? cinfo : NULL), nbns_tree,
1081 /* Don't add information about the authoritative name
1082 servers, or the additional records, to the summary. */
1084 cur_off += dissect_answer_records(tvb, cur_off,
1086 auth, NULL, nbns_tree, opcode,
1087 "Authoritative nameservers");
1090 cur_off += dissect_answer_records(tvb, cur_off,
1092 add, NULL, nbns_tree, opcode,
1093 "Additional records");
1097 /* NetBIOS datagram packet, from RFC 1002, page 32 */
1098 struct nbdgm_header {
1109 /* For packets with data */
1113 /* For error packets */
1118 * NBDS message types.
1120 #define NBDS_DIRECT_UNIQUE 0x10
1121 #define NBDS_DIRECT_GROUP 0x11
1122 #define NBDS_BROADCAST 0x12
1123 #define NBDS_ERROR 0x13
1124 #define NBDS_QUERY_REQUEST 0x14
1125 #define NBDS_POS_QUERY_RESPONSE 0x15
1126 #define NBDS_NEG_QUERY_RESPONSE 0x16
1128 static const value_string nbds_msgtype_vals[] = {
1129 { NBDS_DIRECT_UNIQUE, "Direct_unique datagram" },
1130 { NBDS_DIRECT_GROUP, "Direct_group datagram" },
1131 { NBDS_BROADCAST, "Broadcast datagram" },
1132 { NBDS_ERROR, "Datagram error" },
1133 { NBDS_QUERY_REQUEST, "Datagram query request" },
1134 { NBDS_POS_QUERY_RESPONSE, "Datagram positive query response" },
1135 { NBDS_NEG_QUERY_RESPONSE, "Datagram negative query response" },
1139 static const true_false_string yesno = {
1144 static const value_string node_type_vals[] = {
1153 dissect_nbdgm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1156 proto_tree *nbdgm_tree = NULL;
1157 proto_item *ti = NULL;
1158 struct nbdgm_header header;
1163 static const value_string error_codes[] = {
1164 { 0x82, "Destination name not present" },
1165 { 0x83, "Invalid source name format" },
1166 { 0x84, "Invalid destination name format" },
1170 char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME];
1174 if (check_col(pinfo->cinfo, COL_PROTOCOL))
1175 col_set_str(pinfo->cinfo, COL_PROTOCOL, "NBDS");
1176 if (check_col(pinfo->cinfo, COL_INFO))
1177 col_clear(pinfo->cinfo, COL_INFO);
1179 header.msg_type = tvb_get_guint8(tvb, offset);
1181 flags = tvb_get_guint8(tvb, offset+1);
1182 header.flags.more = flags & 1;
1183 header.flags.first = (flags & 2) >> 1;
1184 header.flags.node_type = (flags & 12) >> 2;
1186 header.dgm_id = tvb_get_ntohs(tvb, offset+2);
1187 tvb_memcpy(tvb, (guint8 *)&header.src_ip, offset+4, 4);
1188 header.src_port = tvb_get_ntohs(tvb, offset+8);
1190 switch (header.msg_type) {
1192 case NBDS_DIRECT_UNIQUE:
1193 case NBDS_DIRECT_GROUP:
1194 case NBDS_BROADCAST:
1195 header.dgm_length = tvb_get_ntohs(tvb, offset+10);
1196 header.pkt_offset = tvb_get_ntohs(tvb, offset+12);
1200 header.error_code = tvb_get_ntohs(tvb, offset+10);
1204 message_index = header.msg_type - 0x0f;
1205 if (message_index < 1 || message_index > 8) {
1209 if (check_col(pinfo->cinfo, COL_INFO)) {
1210 col_add_str(pinfo->cinfo, COL_INFO,
1211 val_to_str(header.msg_type, nbds_msgtype_vals,
1212 "Unknown message type (0x%02X)"));
1216 ti = proto_tree_add_item(tree, proto_nbdgm, tvb, offset, -1,
1218 nbdgm_tree = proto_item_add_subtree(ti, ett_nbdgm);
1220 proto_tree_add_uint(nbdgm_tree, hf_nbdgm_type, tvb,
1223 proto_tree_add_boolean(nbdgm_tree, hf_nbdgm_fragment, tvb,
1226 proto_tree_add_boolean(nbdgm_tree, hf_nbdgm_first, tvb,
1228 header.flags.first);
1229 proto_tree_add_uint(nbdgm_tree, hf_nbdgm_node_type, tvb,
1231 header.flags.node_type);
1233 proto_tree_add_uint(nbdgm_tree, hf_nbdgm_datagram_id, tvb,
1234 offset+2, 2, header.dgm_id);
1235 proto_tree_add_ipv4(nbdgm_tree, hf_nbdgm_src_ip, tvb,
1236 offset+4, 4, header.src_ip);
1237 proto_tree_add_uint(nbdgm_tree, hf_nbdgm_src_port, tvb,
1238 offset+8, 2, header.src_port);
1244 switch (header.msg_type) {
1246 case NBDS_DIRECT_UNIQUE:
1247 case NBDS_DIRECT_GROUP:
1248 case NBDS_BROADCAST:
1250 proto_tree_add_text(nbdgm_tree, tvb, offset, 2,
1251 "Datagram length: %d bytes", header.dgm_length);
1252 proto_tree_add_text(nbdgm_tree, tvb, offset+2, 2,
1253 "Packet offset: %d bytes", header.pkt_offset);
1259 len = get_nbns_name(tvb, offset, offset, name, &name_type);
1262 add_name_and_type(nbdgm_tree, tvb, offset, len,
1263 "Source name", name, name_type);
1267 /* Destination name */
1268 len = get_nbns_name(tvb, offset, offset, name, &name_type);
1271 add_name_and_type(nbdgm_tree, tvb, offset, len,
1272 "Destination name", name, name_type);
1277 * Here we can pass the packet off to the next protocol.
1278 * Set the length of our top-level tree item to include
1281 * XXX - take the datagram length into account?
1283 proto_item_set_len(ti, offset);
1284 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
1285 dissect_netbios_payload(next_tvb, pinfo, tree);
1290 proto_tree_add_text(nbdgm_tree, tvb, offset, 1, "Error code: %s",
1291 val_to_str(header.error_code, error_codes, "Unknown (0x%x)"));
1294 proto_item_set_len(ti, offset);
1297 case NBDS_QUERY_REQUEST:
1298 case NBDS_POS_QUERY_RESPONSE:
1299 case NBDS_NEG_QUERY_RESPONSE:
1300 /* Destination name */
1301 len = get_nbns_name(tvb, offset, offset, name, &name_type);
1304 add_name_and_type(nbdgm_tree, tvb, offset, len,
1305 "Destination name", name, name_type);
1308 proto_item_set_len(ti, offset);
1314 * NetBIOS Session Service message types.
1316 #define SESSION_MESSAGE 0x00
1317 #define SESSION_REQUEST 0x81
1318 #define POSITIVE_SESSION_RESPONSE 0x82
1319 #define NEGATIVE_SESSION_RESPONSE 0x83
1320 #define RETARGET_SESSION_RESPONSE 0x84
1321 #define SESSION_KEEP_ALIVE 0x85
1323 static const value_string message_types[] = {
1324 { SESSION_MESSAGE, "Session message" },
1325 { SESSION_REQUEST, "Session request" },
1326 { POSITIVE_SESSION_RESPONSE, "Positive session response" },
1327 { NEGATIVE_SESSION_RESPONSE, "Negative session response" },
1328 { RETARGET_SESSION_RESPONSE, "Retarget session response" },
1329 { SESSION_KEEP_ALIVE, "Session keep-alive" },
1334 * NetBIOS Session Service flags.
1336 #define NBSS_FLAGS_E 0x1
1338 static const value_string error_codes[] = {
1339 { 0x80, "Not listening on called name" },
1340 { 0x81, "Not listening for called name" },
1341 { 0x82, "Called name not present" },
1342 { 0x83, "Called name present, but insufficient resources" },
1343 { 0x8F, "Unspecified error" },
1348 * Dissect a single NBSS packet (there may be more than one in a given
1351 * [ Hmmm, in my experience, I have never seen more than one NBSS in a
1352 * single segment, since they mostly contain SMBs which are essentially
1353 * a request response type protocol (RJS). ]
1355 * [ However, under heavy load with many requests multiplexed on one
1356 * session it is not unusual to see multiple requests in one TCP
1357 * segment. Unfortunately, in this case a single session message is
1358 * frequently split over multiple segments, which frustrates decoding
1362 dissect_nbss_packet(tvbuff_t *tvb, int offset, packet_info *pinfo,
1363 proto_tree *tree, int is_cifs)
1365 proto_tree *nbss_tree = NULL;
1366 proto_item *ti = NULL;
1367 proto_tree *field_tree;
1371 volatile int length;
1372 int length_remaining;
1374 char name[(NETBIOS_NAME_LEN - 1)*4 + MAXDNAME];
1378 const char *saved_proto;
1380 /* Desegmentation */
1381 length_remaining = tvb_length_remaining(tvb, offset);
1384 * Can we do reassembly?
1386 if (nbss_desegment && pinfo->can_desegment) {
1388 * Yes - is the NBSS header split across segment boundaries?
1390 if (length_remaining < 4) {
1392 * Yes. Tell our caller how many more bytes
1395 return -(4 - length_remaining);
1400 * Get the length of the NBSS message.
1404 length = tvb_get_ntoh24(tvb, offset + 1);
1406 flags = tvb_get_guint8(tvb, offset + 1);
1407 length = tvb_get_ntohs(tvb, offset + 2);
1408 if (flags & NBSS_FLAGS_E)
1413 * Can we do reassembly?
1415 if (nbss_desegment && pinfo->can_desegment) {
1417 * Yes - is the NBSS message split across segment boundaries?
1419 if (length_remaining < length + 4) {
1421 * Yes. Tell our caller how many more bytes
1424 return -((length + 4) - length_remaining);
1428 msg_type = tvb_get_guint8(tvb, offset);
1431 ti = proto_tree_add_item(tree, proto_nbss, tvb, offset, length + 4, FALSE);
1432 nbss_tree = proto_item_add_subtree(ti, ett_nbss);
1434 proto_tree_add_uint_format(nbss_tree, hf_nbss_type, tvb,
1438 val_to_str(msg_type, message_types,
1446 proto_tree_add_text(nbss_tree, tvb, offset, 3, "Length: %u", length);
1451 tf = proto_tree_add_uint(nbss_tree, hf_nbss_flags, tvb, offset, 1, flags);
1452 field_tree = proto_item_add_subtree(tf, ett_nbss_flags);
1453 proto_tree_add_text(field_tree, tvb, offset, 1, "%s",
1454 decode_boolean_bitfield(flags, NBSS_FLAGS_E,
1455 8, "Add 65536 to length", "Add 0 to length"));
1460 proto_tree_add_text(nbss_tree, tvb, offset, 2, "Length: %u", length);
1468 case SESSION_REQUEST:
1469 len = get_nbns_name(tvb, offset, offset, name, &name_type);
1471 add_name_and_type(nbss_tree, tvb, offset, len,
1472 "Called name", name, name_type);
1475 if (check_col(pinfo->cinfo, COL_INFO))
1476 col_append_fstr(pinfo->cinfo, COL_INFO, ", to %s ", name);
1478 len = get_nbns_name(tvb, offset, offset, name, &name_type);
1481 add_name_and_type(nbss_tree, tvb, offset, len,
1482 "Calling name", name, name_type);
1484 if (check_col(pinfo->cinfo, COL_INFO))
1485 col_append_fstr(pinfo->cinfo, COL_INFO, "from %s", name);
1489 case NEGATIVE_SESSION_RESPONSE:
1491 proto_tree_add_text(nbss_tree, tvb, offset, 1,
1493 val_to_str(tvb_get_guint8(tvb, offset),
1494 error_codes, "Unknown (%x)"));
1496 if (check_col(pinfo->cinfo, COL_INFO))
1497 col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
1498 val_to_str(tvb_get_guint8(tvb, offset),
1499 error_codes, "Unknown (%x)"));
1503 case RETARGET_SESSION_RESPONSE:
1505 proto_tree_add_text(nbss_tree, tvb, offset, 4,
1506 "Retarget IP address: %s",
1507 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1512 proto_tree_add_text(nbss_tree, tvb, offset, 2,
1513 "Retarget port: %u",
1514 tvb_get_ntohs(tvb, offset));
1518 case SESSION_MESSAGE:
1520 * Here we can pass the message off to the next protocol.
1521 * Set the length of our top-level tree item to include
1524 proto_item_set_len(ti, offset);
1525 len = tvb_length_remaining(tvb, offset);
1526 reported_len = tvb_reported_length_remaining(tvb, offset);
1529 if (reported_len > length)
1530 reported_len = length;
1532 next_tvb = tvb_new_subset(tvb, offset, len, reported_len);
1535 * Catch the ReportedBoundsError exception; if this
1536 * particular message happens to get a ReportedBoundsError
1537 * exception, that doesn't mean that we should stop
1538 * dissecting NetBIOS messages within this frame or chunk
1539 * of reassembled data.
1541 * If it gets a BoundsError, we can stop, as there's nothing
1542 * more to see, so we just re-throw it.
1544 saved_proto = pinfo->current_proto;
1546 dissect_netbios_payload(next_tvb, pinfo, tree);
1548 CATCH(BoundsError) {
1551 CATCH(ReportedBoundsError) {
1552 show_reported_bounds_error(tvb, pinfo, tree);
1553 pinfo->current_proto = saved_proto;
1563 dissect_nbss(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1565 struct tcpinfo *tcpinfo = pinfo->private_data;
1573 proto_tree *nbss_tree;
1576 if (check_col(pinfo->cinfo, COL_PROTOCOL))
1577 col_set_str(pinfo->cinfo, COL_PROTOCOL, "NBSS");
1578 if (check_col(pinfo->cinfo, COL_INFO))
1579 col_clear(pinfo->cinfo, COL_INFO);
1581 max_data = tvb_length(tvb);
1583 msg_type = tvb_get_guint8(tvb, offset);
1585 if (pinfo->match_port == TCP_PORT_CIFS) {
1587 * Windows 2000 CIFS clients can dispense completely
1588 * with the NETBIOS encapsulation and directly use CIFS
1589 * over TCP. As would be expected, the framing is
1590 * identical, except that the length is 24 bits instead
1591 * of 17. The only message types used are
1592 * SESSION_MESSAGE and SESSION_KEEP_ALIVE.
1600 * This might be a continuation of an earlier message.
1601 * (Yes, that might be true even if we're doing TCP reassembly,
1602 * as the first TCP segment in the capture might start in the
1603 * middle of an NBNS message.)
1607 * If this isn't reassembled data, check to see whether it
1608 * looks like a continuation of a message.
1609 * (If it is reassembled data, it shouldn't be a continuation,
1610 * as reassembly should've gathered the continuations together
1613 if (!tcpinfo->is_reassembled) {
1616 * Not enough data for an NBSS header; assume
1617 * it's a continuation of a message.
1619 * XXX - if there's not enough data, we should
1620 * attempt to reassemble the data, if the first byte
1621 * is a valid message type.
1627 * We have enough data for an NBSS header.
1628 * Get the flags and length of the message,
1629 * and see if they're sane.
1633 length = tvb_get_ntoh24(tvb, offset + 1);
1635 flags = tvb_get_guint8(tvb, offset + 1);
1636 length = tvb_get_ntohs(tvb, offset + 2);
1637 if (flags & NBSS_FLAGS_E)
1640 if ((flags & (~NBSS_FLAGS_E)) != 0) {
1642 * A bogus flag was set; assume it's a continuation.
1649 case SESSION_MESSAGE:
1651 * This is variable-length.
1652 * All we know is that it shouldn't be zero.
1653 * (XXX - can we get zero-length messages?
1654 * Not with SMB, but perhaps other NetBIOS-based
1655 * protocols have them.)
1661 case SESSION_REQUEST:
1663 * This is variable-length.
1664 * The names are DNS-encoded 32-byte values;
1665 * we need at least 2 bytes (one for each name;
1666 * actually, we should have more for the first
1667 * name, as there's no name preceding it so
1668 * there should be no compression), and we
1669 * shouldn't have more than 128 bytes (actually,
1670 * we shouldn't have that many).
1672 * XXX - actually, MacOS X 10.1 (yes, that's
1673 * redundant, but that's what Apple calls it,
1674 * not MacOS X.1) puts names longer than 16
1675 * characters into session request messages,
1676 * so we can have more than 32 bytes of
1677 * name value, so we can have more than 128
1680 if (length < 2 || length > 256)
1684 case POSITIVE_SESSION_RESPONSE:
1686 * This has no data, so the length must be zero.
1692 case NEGATIVE_SESSION_RESPONSE:
1694 * This has 1 byte of data.
1700 case RETARGET_SESSION_RESPONSE:
1702 * This has 6 bytes of data.
1708 case SESSION_KEEP_ALIVE:
1710 * This has no data, so the length must be zero.
1718 * Unknown message type; assume it's a continuation.
1724 if (check_col(pinfo->cinfo, COL_INFO)) {
1725 col_add_fstr(pinfo->cinfo, COL_INFO,
1726 val_to_str(msg_type, message_types, "Unknown (%02x)"));
1729 while (tvb_reported_length_remaining(tvb, offset) > 0) {
1730 len = dissect_nbss_packet(tvb, offset, pinfo, tree, is_cifs);
1733 * We need more data to dissect this, and
1734 * desegmentation is enabled. "-len" is the
1735 * number of additional bytes of data we need.
1737 * Tell the TCP dissector where the data for this
1738 * message starts in the data it handed us, and
1739 * how many more bytes we need, and return.
1741 pinfo->desegment_offset = offset;
1742 pinfo->desegment_len = -len;
1752 * It looks like a continuation.
1754 if (check_col(pinfo->cinfo, COL_INFO))
1755 col_add_fstr(pinfo->cinfo, COL_INFO, "NBSS Continuation Message");
1758 ti = proto_tree_add_item(tree, proto_nbss, tvb, 0, -1, FALSE);
1759 nbss_tree = proto_item_add_subtree(ti, ett_nbss);
1760 proto_tree_add_text(nbss_tree, tvb, 0, -1, "Continuation data");
1765 proto_register_nbt(void)
1768 static hf_register_info hf_nbns[] = {
1770 { "Flags", "nbns.flags",
1771 FT_UINT16, BASE_HEX, NULL, 0x0,
1773 { &hf_nbns_flags_response,
1774 { "Response", "nbns.flags.response",
1775 FT_BOOLEAN, 16, TFS(&tfs_flags_response), F_RESPONSE,
1776 "Is the message a response?", HFILL }},
1777 { &hf_nbns_flags_opcode,
1778 { "Opcode", "nbns.flags.opcode",
1779 FT_UINT16, BASE_DEC, VALS(opcode_vals), F_OPCODE,
1780 "Operation code", HFILL }},
1781 { &hf_nbns_flags_authoritative,
1782 { "Authoritative", "nbns.flags.authoritative",
1783 FT_BOOLEAN, 16, TFS(&tfs_flags_authoritative), F_AUTHORITATIVE,
1784 "Is the server is an authority for the domain?", HFILL }},
1785 { &hf_nbns_flags_truncated,
1786 { "Truncated", "nbns.flags.truncated",
1787 FT_BOOLEAN, 16, TFS(&tfs_flags_truncated), F_TRUNCATED,
1788 "Is the message truncated?", HFILL }},
1789 { &hf_nbns_flags_recdesired,
1790 { "Recursion desired", "nbns.flags.recdesired",
1791 FT_BOOLEAN, 16, TFS(&tfs_flags_recdesired), F_RECDESIRED,
1792 "Do query recursively?", HFILL }},
1793 { &hf_nbns_flags_recavail,
1794 { "Recursion available", "nbns.flags.recavail",
1795 FT_BOOLEAN, 16, TFS(&tfs_flags_recavail), F_RECAVAIL,
1796 "Can the server do recursive queries?", HFILL }},
1797 { &hf_nbns_flags_broadcast,
1798 { "Broadcast", "nbns.flags.broadcast",
1799 FT_BOOLEAN, 16, TFS(&tfs_flags_broadcast), F_BROADCAST,
1800 "Is this a broadcast packet?", HFILL }},
1801 { &hf_nbns_flags_rcode,
1802 { "Reply code", "nbns.flags.rcode",
1803 FT_UINT16, BASE_DEC, VALS(rcode_vals), F_RCODE,
1804 "Reply code", HFILL }},
1805 { &hf_nbns_transaction_id,
1806 { "Transaction ID", "nbns.id",
1807 FT_UINT16, BASE_HEX, NULL, 0x0,
1808 "Identification of transaction", HFILL }},
1809 { &hf_nbns_count_questions,
1810 { "Questions", "nbns.count.queries",
1811 FT_UINT16, BASE_DEC, NULL, 0x0,
1812 "Number of queries in packet", HFILL }},
1813 { &hf_nbns_count_answers,
1814 { "Answer RRs", "nbns.count.answers",
1815 FT_UINT16, BASE_DEC, NULL, 0x0,
1816 "Number of answers in packet", HFILL }},
1817 { &hf_nbns_count_auth_rr,
1818 { "Authority RRs", "nbns.count.auth_rr",
1819 FT_UINT16, BASE_DEC, NULL, 0x0,
1820 "Number of authoritative records in packet", HFILL }},
1821 { &hf_nbns_count_add_rr,
1822 { "Additional RRs", "nbns.count.add_rr",
1823 FT_UINT16, BASE_DEC, NULL, 0x0,
1824 "Number of additional records in packet", HFILL }}
1827 static hf_register_info hf_nbdgm[] = {
1829 { "Message Type", "nbdgm.type",
1830 FT_UINT8, BASE_DEC, VALS(nbds_msgtype_vals), 0x0,
1831 "NBDGM message type", HFILL }},
1832 { &hf_nbdgm_fragment,
1833 { "More fragments follow", "nbdgm.next",
1834 FT_BOOLEAN, BASE_NONE, TFS(&yesno), 0x0,
1835 "TRUE if more fragments follow", HFILL }},
1837 { "This is first fragment", "nbdgm.first",
1838 FT_BOOLEAN, BASE_NONE, TFS(&yesno), 0x0,
1839 "TRUE if first fragment", HFILL }},
1840 { &hf_nbdgm_node_type,
1841 { "Node Type", "nbdgm.node_type",
1842 FT_UINT8, BASE_DEC, VALS(node_type_vals), 0x0,
1843 "Node type", HFILL }},
1844 { &hf_nbdgm_datagram_id,
1845 { "Datagram ID", "nbdgm.dgram_id",
1846 FT_UINT16, BASE_HEX, NULL, 0x0,
1847 "Datagram identifier", HFILL }},
1849 { "Source IP", "nbdgm.src.ip",
1850 FT_IPv4, BASE_NONE, NULL, 0x0,
1851 "Source IPv4 address", HFILL }},
1852 { &hf_nbdgm_src_port,
1853 { "Source Port", "nbdgm.src.port",
1854 FT_UINT16, BASE_DEC, NULL, 0x0,
1855 "Source port", HFILL }}
1858 static hf_register_info hf_nbss[] = {
1860 { "Message Type", "nbss.type",
1861 FT_UINT8, BASE_DEC, NULL, 0x0,
1862 "NBSS message type", HFILL }},
1864 { "Flags", "nbss.flags",
1865 FT_UINT8, BASE_HEX, NULL, 0x0,
1866 "NBSS message flags", HFILL }}
1868 static gint *ett[] = {
1873 &ett_nbns_name_flags,
1881 module_t *nbss_module;
1883 proto_nbns = proto_register_protocol("NetBIOS Name Service", "NBNS", "nbns");
1884 proto_register_field_array(proto_nbns, hf_nbns, array_length(hf_nbns));
1886 proto_nbdgm = proto_register_protocol("NetBIOS Datagram Service",
1888 proto_register_field_array(proto_nbdgm, hf_nbdgm, array_length(hf_nbdgm));
1890 proto_nbss = proto_register_protocol("NetBIOS Session Service",
1892 proto_register_field_array(proto_nbss, hf_nbss, array_length(hf_nbss));
1894 proto_register_subtree_array(ett, array_length(ett));
1896 nbss_module = prefs_register_protocol(proto_nbss, NULL);
1897 prefs_register_bool_preference(nbss_module, "desegment_nbss_commands",
1898 "Desegment all NBSS packets spanning multiple TCP segments",
1899 "Whether NBSS dissector should desegment all packets spanning multiple TCP segments",
1904 proto_reg_handoff_nbt(void)
1906 dissector_handle_t nbns_handle, nbdgm_handle, nbss_handle;
1908 nbns_handle = create_dissector_handle(dissect_nbns, proto_nbns);
1909 dissector_add("udp.port", UDP_PORT_NBNS, nbns_handle);
1910 nbdgm_handle = create_dissector_handle(dissect_nbdgm, proto_nbdgm);
1911 dissector_add("udp.port", UDP_PORT_NBDGM, nbdgm_handle);
1912 nbss_handle = create_dissector_handle(dissect_nbss, proto_nbss);
1913 dissector_add("tcp.port", TCP_PORT_NBSS, nbss_handle);
1914 dissector_add("tcp.port", TCP_PORT_CIFS, nbss_handle);