summaryrefslogtreecommitdiff
path: root/source3/libsmb/nmblib.c
blob: 67432271737449f2cbec713e3296976e561a78a5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   NBT netbios library routines
   Copyright (C) Andrew Tridgell 1994-1995
   
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
   
*/

#include "includes.h"
#include "nameserv.h"

extern int DEBUGLEVEL;

int num_good_sends=0;
int  num_good_receives=0;
static uint16 name_trn_id = 0;
BOOL CanRecurse = True;
extern pstring scope;

/*******************************************************************
  handle "compressed" name pointers
  ******************************************************************/
static BOOL handle_name_ptrs(unsigned char *ubuf,int *offset,int length,
			     BOOL *got_pointer,int *ret)
{
  int loop_count=0;

  while ((ubuf[*offset] & 0xC0) == 0xC0) {
    if (!*got_pointer) (*ret) += 2;
    (*got_pointer)=True;
    (*offset) = ((ubuf[*offset] & ~0xC0)<<8) | ubuf[(*offset)+1];
    if (loop_count++ == 10 || (*offset) < 0 || (*offset)>(length-2)) {
      return(False);
    }
  }
  return(True);
}

/*******************************************************************
  parse a nmb name from "compressed" format to something readable
  return the space taken by the name, or 0 if the name is invalid
  ******************************************************************/
static int parse_nmb_name(char *inbuf,int offset,int length,
			  struct nmb_name *name)
{
  int m,n=0;
  unsigned char *ubuf = (unsigned char *)inbuf;
  int ret = 0;
  BOOL got_pointer=False;

  if (length - offset < 2) return(0);  

  /* handle initial name pointers */
  if (!handle_name_ptrs(ubuf,&offset,length,&got_pointer,&ret)) return(0);
  
  m = ubuf[offset];

  if (!m) return(0);
  if ((m & 0xC0) || offset+m+2 > length) return(0);

  bzero((char *)name,sizeof(*name));

  /* the "compressed" part */
  if (!got_pointer) ret += m + 2;
  offset++;
  while (m) {
    unsigned char c1,c2;
    c1 = ubuf[offset++]-'A';
    c2 = ubuf[offset++]-'A';
    if ((c1 & 0xF0) || (c2 & 0xF0)) return(0);
    name->name[n++] = (c1<<4) | c2;
    m -= 2;
  }
  name->name[n] = 0;

  if (n==16) {
    /* parse out the name type, 
       its always in the 16th byte of the name */
    name->name_type = name->name[15];
  
    /* remove trailing spaces */
    name->name[15] = 0;
    n = 14;
    while (n && name->name[n]==' ') name->name[n--] = 0;  
  }

  /* now the domain parts (if any) */
  n = 0;
  while ((m=ubuf[offset])) {
    /* we can have pointers within the domain part as well */
    if (!handle_name_ptrs(ubuf,&offset,length,&got_pointer,&ret)) return(0);

    if (!got_pointer) ret += m+1;
    if (n) name->scope[n++] = '.';
    if (m+2+offset>length || n+m+1>sizeof(name->scope)) return(0);
    offset++;
    while (m--) name->scope[n++] = (char)ubuf[offset++];
  }
  name->scope[n++] = 0;  

  return(ret);
}


/*******************************************************************
  put a compressed nmb name into a buffer. return the length of the
  compressed name

  compressed names are really weird. The "compression" doubles the
  size. The idea is that it also means that compressed names conform
  to the doman name system. See RFC1002.
  ******************************************************************/
static int put_nmb_name(char *buf,int offset,struct nmb_name *name)
{
  int ret,m;
  fstring buf1;
  char *p;

  if (name->name[0] == '*') {
    /* special case for wildcard name */
    bzero(buf1,20);
    buf1[0] = '*';
  } else {
    sprintf(buf1,"%-15.15s%c",name->name,name->name_type);
  }

  buf[offset] = 0x20;

  ret = 34;

  for (m=0;m<16;m++) {
    buf[offset+1+2*m] = 'A' + ((buf1[m]>>4)&0xF);
    buf[offset+2+2*m] = 'A' + (buf1[m]&0xF);
  }
  offset += 33;

  buf[offset] = 0;

  if (name->scope[0]) {
    /* XXXX this scope handling needs testing */
    ret += strlen(name->scope) + 1;
    strcpy(&buf[offset+1],name->scope);  
  
    p = &buf[offset+1];
    while ((p = strchr(p,'.'))) {
      buf[offset] = PTR_DIFF(p,&buf[offset]);
      offset += buf[offset];
      p = &buf[offset+1];
    }
    buf[offset] = strlen(&buf[offset+1]);
  }

  return(ret);
}

/*******************************************************************
  useful for debugging messages
  ******************************************************************/
char *namestr(struct nmb_name *n)
{
  static int i=0;
  static fstring ret[4];
  char *p = ret[i];

  if (!n->scope[0])
    sprintf(p,"%s(%x)",n->name,n->name_type);
  else
    sprintf(p,"%s(%x).%s",n->name,n->name_type,n->scope);

  i = (i+1)%4;
  return(p);
}

/*******************************************************************
  allocate are parse some resource records
  ******************************************************************/
static BOOL parse_alloc_res_rec(char *inbuf,int *offset,int length,
				struct res_rec **recs,
				int count)
{
  int i;
  *recs = (struct res_rec *)malloc(sizeof(**recs)*count);
  if (!*recs) return(False);

  bzero(*recs,sizeof(**recs)*count);

  for (i=0;i<count;i++) {
    int l = parse_nmb_name(inbuf,*offset,length,&(*recs)[i].rr_name);
    (*offset) += l;
    if (!l || (*offset)+10 > length) {
      free(*recs);
      return(False);
    }
    (*recs)[i].rr_type = RSVAL(inbuf,(*offset));
    (*recs)[i].rr_class = RSVAL(inbuf,(*offset)+2);
    (*recs)[i].ttl = RIVAL(inbuf,(*offset)+4);
    (*recs)[i].rdlength = RSVAL(inbuf,(*offset)+8);
    (*offset) += 10;
    if ((*recs)[i].rdlength>sizeof((*recs)[i].rdata) || 
	(*offset)+(*recs)[i].rdlength > length) {
      free(*recs);
      return(False);
    }
    memcpy((*recs)[i].rdata,inbuf+(*offset),(*recs)[i].rdlength);
    (*offset) += (*recs)[i].rdlength;    
  }
  return(True);
}

/*******************************************************************
  put a resource record into a packet
  ******************************************************************/
static int put_res_rec(char *buf,int offset,struct res_rec *recs,int count)
{
  int ret=0;
  int i;

  for (i=0;i<count;i++) {
    int l = put_nmb_name(buf,offset,&recs[i].rr_name);
    offset += l;
    ret += l;
    RSSVAL(buf,offset,recs[i].rr_type);
    RSSVAL(buf,offset+2,recs[i].rr_class);
    RSIVAL(buf,offset+4,recs[i].ttl);
    RSSVAL(buf,offset+8,recs[i].rdlength);
    memcpy(buf+offset+10,recs[i].rdata,recs[i].rdlength);
    offset += 10+recs[i].rdlength;
    ret += 10+recs[i].rdlength;
  }

  return(ret);
}

/*******************************************************************
  parse a dgram packet. Return False if the packet can't be parsed 
  or is invalid for some reason, True otherwise 

  this is documented in section 4.4.1 of RFC1002
  ******************************************************************/
static BOOL parse_dgram(char *inbuf,int length,struct dgram_packet *dgram)
{
  int offset;
  int flags;

  bzero((char *)dgram,sizeof(*dgram));

  if (length < 14) return(False);

  dgram->header.msg_type = CVAL(inbuf,0);
  flags = CVAL(inbuf,1);
  dgram->header.flags.node_type = (enum node_type)((flags>>2)&3);
  if (flags & 1) dgram->header.flags.more = True;
  if (flags & 2) dgram->header.flags.first = True;
  dgram->header.dgm_id = RSVAL(inbuf,2);
  putip((char *)&dgram->header.source_ip,inbuf+4);
  dgram->header.source_port = RSVAL(inbuf,8);
  dgram->header.dgm_length = RSVAL(inbuf,10);
  dgram->header.packet_offset = RSVAL(inbuf,12);

  offset = 14;

  if (dgram->header.msg_type == 0x10 ||
      dgram->header.msg_type == 0x11 ||
      dgram->header.msg_type == 0x12) {      
    offset += parse_nmb_name(inbuf,offset,length,&dgram->source_name);
    offset += parse_nmb_name(inbuf,offset,length,&dgram->dest_name);
  }

  if (offset >= length || (length-offset > sizeof(dgram->data))) 
    return(False);

  dgram->datasize = length-offset;
  memcpy(dgram->data,inbuf+offset,dgram->datasize);

  return(True);
}


/*******************************************************************
  parse a nmb packet. Return False if the packet can't be parsed 
  or is invalid for some reason, True otherwise 
  ******************************************************************/
static BOOL parse_nmb(char *inbuf,int length,struct nmb_packet *nmb)
{
  int nm_flags,offset;

  bzero((char *)nmb,sizeof(*nmb));

  if (length < 12) return(False);

  /* parse the header */
  nmb->header.name_trn_id = RSVAL(inbuf,0);
  nmb->header.opcode = (CVAL(inbuf,2) >> 3) & 0xF;
  nmb->header.response = ((CVAL(inbuf,2)>>7)&1)?True:False;
  nm_flags = ((CVAL(inbuf,2) & 0x7) << 4) + (CVAL(inbuf,3)>>4);
  nmb->header.nm_flags.bcast = (nm_flags&1)?True:False;
  nmb->header.nm_flags.recursion_available = (nm_flags&8)?True:False;
  nmb->header.nm_flags.recursion_desired = (nm_flags&0x10)?True:False;
  nmb->header.nm_flags.trunc = (nm_flags&0x20)?True:False;
  nmb->header.nm_flags.authoritative = (nm_flags&0x40)?True:False;
  nmb->header.rcode = CVAL(inbuf,3) & 0xF;
  nmb->header.qdcount = RSVAL(inbuf,4);
  nmb->header.ancount = RSVAL(inbuf,6);
  nmb->header.nscount = RSVAL(inbuf,8);
  nmb->header.arcount = RSVAL(inbuf,10);
  
  if (nmb->header.qdcount) {
    offset = parse_nmb_name(inbuf,12,length,&nmb->question.question_name);
    if (!offset) return(False);

    if (length - (12+offset) < 4) return(False);
    nmb->question.question_type = RSVAL(inbuf,12+offset);
    nmb->question.question_class = RSVAL(inbuf,12+offset+2);

    offset += 12+4;
  } else {
    offset = 12;
  }

  /* and any resource records */
  if (nmb->header.ancount && 
      !parse_alloc_res_rec(inbuf,&offset,length,&nmb->answers,
			   nmb->header.ancount))
    return(False);

  if (nmb->header.nscount && 
      !parse_alloc_res_rec(inbuf,&offset,length,&nmb->nsrecs,
			   nmb->header.nscount))
    return(False);
  
  if (nmb->header.arcount && 
      !parse_alloc_res_rec(inbuf,&offset,length,&nmb->additional,
			   nmb->header.arcount))
    return(False);

  return(True);
}

/*******************************************************************
  free up any resources associated with an nmb packet
  ******************************************************************/
void free_nmb_packet(struct nmb_packet *nmb)
{  
  if (nmb->answers) free(nmb->answers);
  if (nmb->nsrecs) free(nmb->nsrecs);
  if (nmb->additional) free(nmb->additional);
}

/*******************************************************************
  free up any resources associated with a packet
  ******************************************************************/
void free_packet(struct packet_struct *packet)
{  
  if (packet->packet_type == NMB_PACKET)
    free_nmb_packet(&packet->packet.nmb);
  free(packet);
}

/*******************************************************************
  read a packet from a socket and parse it, returning a packet ready
  to be used or put on the queue. This assumes a UDP socket
  ******************************************************************/
struct packet_struct *read_packet(int fd,enum packet_type packet_type)
{
  extern struct in_addr lastip;
  extern int lastport;
  struct packet_struct *packet;
  char buf[MAX_DGRAM_SIZE];
  int length;
  BOOL ok=False;

  length = read_udp_socket(fd,buf,sizeof(buf));
  if (length < MIN_DGRAM_SIZE) return(NULL);

  packet = (struct packet_struct *)malloc(sizeof(*packet));
  if (!packet) return(NULL);

  packet->next = NULL;
  packet->prev = NULL;
  packet->ip = lastip;
  packet->port = lastport;
  packet->fd = fd;
  packet->timestamp = time(NULL);
  packet->packet_type = packet_type;
  switch (packet_type) 
    {
    case NMB_PACKET:
      ok = parse_nmb(buf,length,&packet->packet.nmb);
      break;

    case DGRAM_PACKET:
      ok = parse_dgram(buf,length,&packet->packet.dgram);
      break;
    }
  if (!ok) {
    free(packet);
    return(NULL);
  }

  num_good_receives++;

  DEBUG(4,("%s received a packet of len %d from (%s) port %d\n",
	   timestring(),length,inet_ntoa(packet->ip),packet->port));

  return(packet);
}
					 

/*******************************************************************
  send a udp packet on a already open socket
  ******************************************************************/
static BOOL send_udp(int fd,char *buf,int len,struct in_addr ip,int port)
{
  BOOL ret;
  struct sockaddr_in sock_out;

  /* set the address and port */
  bzero((char *)&sock_out,sizeof(sock_out));
  putip((char *)&sock_out.sin_addr,(char *)&ip);
  sock_out.sin_port = htons( port );
  sock_out.sin_family = AF_INET;
  
  DEBUG(4,("%s sending a packet of len %d to (%s) on port %d\n",
	   timestring(),len,inet_ntoa(ip),port));
	
  ret = (sendto(fd,buf,len,0,(struct sockaddr *)&sock_out,
		sizeof(sock_out)) >= 0);

  if (!ret)
    DEBUG(0,("Packet send failed to %s(%d) ERRNO=%s\n",
	     inet_ntoa(ip),port,strerror(errno)));

  if (ret)
    num_good_sends++;

  return(ret);
}

/*******************************************************************
  build a dgram packet ready for sending

  XXXX This currently doesn't handle packets too big for one
  datagram. It should split them and use the packet_offset, more and
  first flags to handle the fragmentation. Yuck.
  ******************************************************************/
static int build_dgram(char *buf,struct packet_struct *p)
{
  struct dgram_packet *dgram = &p->packet.dgram;
  unsigned char *ubuf = (unsigned char *)buf;
  int offset=0;

  /* put in the header */
  ubuf[0] = dgram->header.msg_type;
  ubuf[1] = (((int)dgram->header.flags.node_type)<<2);
  if (dgram->header.flags.more) ubuf[1] |= 1;
  if (dgram->header.flags.first) ubuf[1] |= 2;
  RSSVAL(ubuf,2,dgram->header.dgm_id);
  putip(ubuf+4,(char *)&dgram->header.source_ip);
  RSSVAL(ubuf,8,dgram->header.source_port);
  RSSVAL(ubuf,12,dgram->header.packet_offset);

  offset = 14;

  if (dgram->header.msg_type == 0x10 ||
      dgram->header.msg_type == 0x11 ||
      dgram->header.msg_type == 0x12) {      
    offset += put_nmb_name((char *)ubuf,offset,&dgram->source_name);
    offset += put_nmb_name((char *)ubuf,offset,&dgram->dest_name);
  }

  memcpy(ubuf+offset,dgram->data,dgram->datasize);
  offset += dgram->datasize;

  /* automatically set the dgm_length */
  dgram->header.dgm_length = offset;
  RSSVAL(ubuf,10,dgram->header.dgm_length); 

  return(offset);
}

/*******************************************************************
  build a nmb name
  ******************************************************************/
void make_nmb_name(struct nmb_name *n,char *name,int type,char *this_scope)
{
  strcpy(n->name,name);
  strupper(n->name);
  n->name_type = type;
  strcpy(n->scope,this_scope);
}


/*******************************************************************
  build a nmb packet ready for sending

  XXXX this currently relies on not being passed something that expands
  to a packet too big for the buffer. Eventually this should be
  changed to set the trunc bit so the receiver can request the rest
  via tcp (when that becomes supported)
  ******************************************************************/
static int build_nmb(char *buf,struct packet_struct *p)
{
  struct nmb_packet *nmb = &p->packet.nmb;
  unsigned char *ubuf = (unsigned char *)buf;
  int offset=0;

  /* put in the header */
  RSSVAL(ubuf,offset,nmb->header.name_trn_id);
  ubuf[offset+2] = (nmb->header.opcode & 0xF) << 3;
  if (nmb->header.response) ubuf[offset+2] |= (1<<7);
  if (nmb->header.nm_flags.authoritative) ubuf[offset+2] |= 0x4;
  if (nmb->header.nm_flags.trunc) ubuf[offset+2] |= 0x2;
  if (nmb->header.nm_flags.recursion_desired) ubuf[offset+2] |= 0x1;
  if (nmb->header.nm_flags.recursion_available) ubuf[offset+3] |= 0x80;
  if (nmb->header.nm_flags.bcast) ubuf[offset+3] |= 0x10;
  ubuf[offset+3] |= (nmb->header.rcode & 0xF);
  RSSVAL(ubuf,offset+4,nmb->header.qdcount);
  RSSVAL(ubuf,offset+6,nmb->header.ancount);
  RSSVAL(ubuf,offset+8,nmb->header.nscount);
  RSSVAL(ubuf,offset+10,nmb->header.arcount);
  
  offset += 12;
  if (nmb->header.qdcount) {
    /* XXXX this doesn't handle a qdcount of > 1 */
    offset += put_nmb_name((char *)ubuf,offset,&nmb->question.question_name);
    RSSVAL(ubuf,offset,nmb->question.question_type);
    RSSVAL(ubuf,offset+2,nmb->question.question_class);
    offset += 4;
  }

  if (nmb->header.ancount)
    offset += put_res_rec((char *)ubuf,offset,nmb->answers,
			  nmb->header.ancount);

  if (nmb->header.nscount)
    offset += put_res_rec((char *)ubuf,offset,nmb->nsrecs,
			  nmb->header.nscount);

  if (nmb->header.arcount)
    offset += put_res_rec((char *)ubuf,offset,nmb->additional,
			  nmb->header.arcount);  

  return(offset);
}


/*******************************************************************
  send a packet_struct
  ******************************************************************/
BOOL send_packet(struct packet_struct *p)
{
  char buf[1024];
  int len=0;

  bzero(buf,sizeof(buf));

  switch (p->packet_type) 
    {
    case NMB_PACKET:
      len = build_nmb(buf,p);
      break;

    case DGRAM_PACKET:
      len = build_dgram(buf,p);
      break;
    }

  if (!len) return(False);

  return(send_udp(p->fd,buf,len,p->ip,p->port));
}

/****************************************************************************
  receive a packet with timeout on a open UDP filedescriptor
  The timeout is in milliseconds
  ***************************************************************************/
struct packet_struct *receive_packet(int fd,enum packet_type type,int t)
{
  fd_set fds;
  struct timeval timeout;

  FD_ZERO(&fds);
  FD_SET(fd,&fds);
  timeout.tv_sec = t/1000;
  timeout.tv_usec = 1000*(t%1000);

  sys_select(&fds,&timeout);

  if (FD_ISSET(fd,&fds)) 
    return(read_packet(fd,type));

  return(NULL);
}


/****************************************************************************
interpret a node status response
****************************************************************************/
static void interpret_node_status(char *p, char *master,char *rname)
{
  int level = (master||rname)?4:0;
  int numnames = CVAL(p,0);
  DEBUG(level,("received %d names\n",numnames));

  if (rname) *rname = 0;
  if (master) *master = 0;

  p += 1;
  while (numnames--)
    {
      char qname[17];
      int type;
      fstring flags;
      *flags = 0;
      StrnCpy(qname,p,15);
      type = CVAL(p,15);
      p += 16;

      if (p[0] & 0x80) strcat(flags,"<GROUP> ");
      if ((p[0] & 0x60) == 0) strcat(flags,"B ");
      if ((p[0] & 0x60) == 1) strcat(flags,"P ");
      if ((p[0] & 0x60) == 2) strcat(flags,"M ");
      if ((p[0] & 0x60) == 3) strcat(flags,"_ ");
      if (p[0] & 0x10) strcat(flags,"<DEREGISTERING> ");
      if (p[0] & 0x08) strcat(flags,"<CONFLICT> ");
      if (p[0] & 0x04) strcat(flags,"<ACTIVE> ");
      if (p[0] & 0x02) strcat(flags,"<PERMANENT> ");

      if (master && !*master && type == 0x1d) {
	StrnCpy(master,qname,15);
	trim_string(master,NULL," ");
      }

      if (rname && !*rname && type == 0x20 && !(p[0]&0x80)) {
	StrnCpy(rname,qname,15);
	trim_string(rname,NULL," ");
      }
      
      DEBUG(level,("\t%s (type=0x%x)\t%s\n",qname,type,flags));
      p+=2;
    }
  DEBUG(level,("num_good_sends=%d num_good_receives=%d\n",
	       IVAL(p,20),IVAL(p,24)));
}


/****************************************************************************
  do a netbios name status query on a host

  the "master" parameter is a hack used for finding workgroups.
  **************************************************************************/
BOOL name_status(int fd,char *name,int name_type,BOOL recurse,
		 struct in_addr to_ip,char *master,char *rname,
		 void (*fn)())
{
  BOOL found=False;
  int retries = 2;
  int retry_time = 5000;
  struct timeval tval;
  struct packet_struct p;
  struct packet_struct *p2;
  struct nmb_packet *nmb = &p.packet.nmb;

  bzero((char *)&p,sizeof(p));

  if (!name_trn_id) name_trn_id = (time(NULL)%(unsigned)0x7FFF) + 
    (getpid()%(unsigned)100);
  name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;

  nmb->header.name_trn_id = name_trn_id;
  nmb->header.opcode = 0;
  nmb->header.response = False;
  nmb->header.nm_flags.bcast = False;
  nmb->header.nm_flags.recursion_available = CanRecurse;
  nmb->header.nm_flags.recursion_desired = recurse;
  nmb->header.nm_flags.trunc = False;
  nmb->header.nm_flags.authoritative = False;
  nmb->header.rcode = 0;
  nmb->header.qdcount = 1;
  nmb->header.ancount = 0;
  nmb->header.nscount = 0;
  nmb->header.arcount = 0;

  make_nmb_name(&nmb->question.question_name,name,name_type,scope);

  nmb->question.question_type = 0x21;
  nmb->question.question_class = 0x1;

  p.ip = to_ip;
  p.port = NMB_PORT;
  p.fd = fd;
  p.timestamp = time(NULL);
  p.packet_type = NMB_PACKET;

  GetTimeOfDay(&tval);

  if (!send_packet(&p)) 
    return(False);

  retries--;

  while (1)
    {
      struct timeval tval2;
      GetTimeOfDay(&tval2);
      if (TvalDiff(&tval,&tval2) > retry_time) {
	if (!retries) break;
	if (!found && !send_packet(&p))
	  return False;
	GetTimeOfDay(&tval);
	retries--;
      }

      if ((p2=receive_packet(fd,NMB_PACKET,90)))
	{     
	  struct nmb_packet *nmb2 = &p2->packet.nmb;
	  if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
	      !nmb2->header.response) {
	    /* its not for us - maybe deal with it later */
	    if (fn) 
	      fn(p2);
	    else
	      free_packet(p2);
	    continue;
	  }
	  
	  if (nmb2->header.opcode != 0 ||
	      nmb2->header.nm_flags.bcast ||
	      nmb2->header.rcode ||
	      !nmb2->header.ancount ||
	      nmb2->answers->rr_type != 0x21) {
	    /* XXXX what do we do with this? could be a redirect, but
	       we'll discard it for the moment */
	    free_packet(p2);
	    continue;
	  }

	  interpret_node_status(&nmb2->answers->rdata[0], master,rname);
	  free_packet(p2);
	  return(True);
	}
    }
  

  DEBUG(0,("No status response (this is not unusual)\n"));

  return(False);
}


/****************************************************************************
  do a netbios name query to find someones IP
  ****************************************************************************/
BOOL name_query(int fd,char *name,int name_type, 
		BOOL bcast,BOOL recurse,
		struct in_addr to_ip, struct in_addr *ip,void (*fn)())
{
  BOOL found=False;
  int retries = 3;
  int retry_time = bcast?250:2000;
  struct timeval tval;
  struct packet_struct p;
  struct packet_struct *p2;
  struct nmb_packet *nmb = &p.packet.nmb;

  bzero((char *)&p,sizeof(p));

  if (!name_trn_id) name_trn_id = (time(NULL)%(unsigned)0x7FFF) + 
    (getpid()%(unsigned)100);
  name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;

  nmb->header.name_trn_id = name_trn_id;
  nmb->header.opcode = 0;
  nmb->header.response = False;
  nmb->header.nm_flags.bcast = bcast;
  nmb->header.nm_flags.recursion_available = CanRecurse;
  nmb->header.nm_flags.recursion_desired = recurse;
  nmb->header.nm_flags.trunc = False;
  nmb->header.nm_flags.authoritative = False;
  nmb->header.rcode = 0;
  nmb->header.qdcount = 1;
  nmb->header.ancount = 0;
  nmb->header.nscount = 0;
  nmb->header.arcount = 0;

  make_nmb_name(&nmb->question.question_name,name,name_type,scope);

  nmb->question.question_type = 0x20;
  nmb->question.question_class = 0x1;

  p.ip = to_ip;
  p.port = NMB_PORT;
  p.fd = fd;
  p.timestamp = time(NULL);
  p.packet_type = NMB_PACKET;

  GetTimeOfDay(&tval);

  if (!send_packet(&p)) 
    return(False);

  retries--;

  while (1)
    {
      struct timeval tval2;
      GetTimeOfDay(&tval2);
      if (TvalDiff(&tval,&tval2) > retry_time) {
	if (!retries) break;
	if (!found && !send_packet(&p))
	  return False;
	GetTimeOfDay(&tval);
	retries--;
      }

      if ((p2=receive_packet(fd,NMB_PACKET,90)))
	{     
	  struct nmb_packet *nmb2 = &p2->packet.nmb;
	  if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
	      !nmb2->header.response) {
	    /* its not for us - maybe deal with it later 
	       (put it on the queue?) */
	    if (fn) 
	      fn(p2);
	    else
	      free_packet(p2);
	    continue;
	  }
	  
	  if (nmb2->header.opcode != 0 ||
	      nmb2->header.nm_flags.bcast ||
	      nmb2->header.rcode ||
	      !nmb2->header.ancount) {
	    /* XXXX what do we do with this? could be a redirect, but
	       we'll discard it for the moment */
	    free_packet(p2);
	    continue;
	  }

	  if (ip) {
	    putip((char *)ip,&nmb2->answers->rdata[2]);
	    DEBUG(fn?3:2,("Got a positive name query response from %s",
			  inet_ntoa(p2->ip)));
	    DEBUG(fn?3:2,(" (%s)\n",inet_ntoa(*ip)));
	  }
	  found=True; retries=0;
	  free_packet(p2);
	  if (fn) break;
	}
    }

  return(found);
}


/****************************************************************************
  construct and send a netbios DGRAM

  Note that this currently sends all answers to port 138. thats the
  wrong things to do! I should send to the requestors port. XXX
  **************************************************************************/
BOOL send_mailslot_reply(char *mailslot,int fd,char *buf,int len,
			 char *srcname,char *dstname,
			 int src_type,int dest_type,
			 struct in_addr dest_ip,
			 struct in_addr src_ip)
{
  struct packet_struct p;
  struct dgram_packet *dgram = &p.packet.dgram;
  char *ptr,*p2;
  char tmp[4];

  bzero((char *)&p,sizeof(p));

  dgram->header.msg_type = 0x11; /* DIRECT GROUP DATAGRAM */
  dgram->header.flags.node_type = M_NODE;
  dgram->header.flags.first = True;
  dgram->header.flags.more = False;
  dgram->header.dgm_id = name_trn_id++;
  dgram->header.source_ip = src_ip;
  dgram->header.source_port = DGRAM_PORT;
  dgram->header.dgm_length = 0; /* let build_dgram() handle this */
  dgram->header.packet_offset = 0;
  
  make_nmb_name(&dgram->source_name,srcname,src_type,scope);
  make_nmb_name(&dgram->dest_name,dstname,dest_type,scope);

  ptr = &dgram->data[0];

  /* now setup the smb part */
  ptr -= 4; /* XXX ugliness because of handling of tcp SMB length */
  memcpy(tmp,ptr,4);
  set_message(ptr,17,17 + len,True);
  memcpy(ptr,tmp,4);

  CVAL(ptr,smb_com) = SMBtrans;
  SSVAL(ptr,smb_vwv1,len);
  SSVAL(ptr,smb_vwv11,len);
  SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  SSVAL(ptr,smb_vwv13,3);
  SSVAL(ptr,smb_vwv14,1);
  SSVAL(ptr,smb_vwv15,1);
  SSVAL(ptr,smb_vwv16,2);
  p2 = smb_buf(ptr);
  strcpy(p2,mailslot);
  p2 = skip_string(p2,1);

  memcpy(p2,buf,len);
  p2 += len;

  dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length */

  p.ip = dest_ip;
  p.port = DGRAM_PORT;
  p.fd = fd;
  p.timestamp = time(NULL);
  p.packet_type = DGRAM_PACKET;

  return(send_packet(&p));
}