summaryrefslogtreecommitdiff
path: root/source3/libsmb/namequery.c
blob: 299145ceff7d55b22b689b9ed12c103d7d7ae25e (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
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   name query routines
   Copyright (C) Andrew Tridgell 1994-1998
   
   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"

extern pstring scope;
extern pstring global_myname;
extern int DEBUGLEVEL;

/* nmbd.c sets this to True. */
BOOL global_in_nmbd = False;

  static int name_trn_id = 0;

/****************************************************************************
interpret a node status response
****************************************************************************/
static void _interpret_node_status(char *p, char *master,char *rname)
{
  int numnames = CVAL(p,0);
  DEBUG(1,("received %d names\n",numnames));

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

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

      fstrcat(flags, (p[0] & 0x80) ? "<GROUP> " : "        ");
      if ((p[0] & 0x60) == 0x00) fstrcat(flags,"B ");
      if ((p[0] & 0x60) == 0x20) fstrcat(flags,"P ");
      if ((p[0] & 0x60) == 0x40) fstrcat(flags,"M ");
      if ((p[0] & 0x60) == 0x60) fstrcat(flags,"H ");
      if (p[0] & 0x10) fstrcat(flags,"<DEREGISTERING> ");
      if (p[0] & 0x08) fstrcat(flags,"<CONFLICT> ");
      if (p[0] & 0x04) fstrcat(flags,"<ACTIVE> ");
      if (p[0] & 0x02) fstrcat(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," ");
      }
      
      for (i = strlen( qname) ; --i >= 0 ; ) {
	if (!isprint((int)qname[i])) qname[i] = '.';
      }
      DEBUG(1,("\t%-15s <%02x> - %s\n",qname,type,flags));
      p+=2;
    }
  DEBUG(1,("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)(struct packet_struct *))
{
  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;
	int packet_type = NMB_PACKET;
	BOOL first_time = True;

	if (fd == -1)
	{
		retries = 1;
		packet_type = NMB_SOCK_PACKET;
		fd = get_nmb_sock();

		if (fd < 0)
		{
			return False;
		}
	}
  bzero((char *)&p,sizeof(p));

  if (!name_trn_id) name_trn_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) + 
    ((unsigned)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 = False;
  nmb->header.nm_flags.recursion_desired = False;
  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 = packet_type;

  GetTimeOfDay(&tval);

  while (1)
    {
      struct timeval tval2;
      GetTimeOfDay(&tval2);
      if (first_time || TvalDiff(&tval,&tval2) > retry_time)
	{
		first_time = False;
	if (!found && !send_packet(&p))
	{
		if (packet_type == NMB_SOCK_PACKET) close(fd);
	  return False;
	}
	GetTimeOfDay(&tval);
      }

      if ((p2=receive_packet(fd,packet_type,90)))
	{     
	  struct nmb_packet *nmb2 = &p2->packet.nmb;
      debug_nmb_packet(p2);

	  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;
	  }

	retries--;

	  _interpret_node_status(&nmb2->answers->rdata[0], master,rname);
	  free_packet(p2);
		if (packet_type == NMB_SOCK_PACKET) close(fd);
	  return(True);
	}
    }
  

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

if (packet_type == NMB_SOCK_PACKET) close(fd);
  return(False);
}


/****************************************************************************
  do a netbios name query to find someones IP
  returns an array of IP addresses or NULL if none
  *count will be set to the number of addresses returned
  ****************************************************************************/
struct in_addr *name_query(int fd,const char *name,int name_type, BOOL bcast,BOOL recurse,
         struct in_addr to_ip, int *count, void (*fn)(struct packet_struct *))
{
  BOOL found=False;
  int i, retries = 3;
  int retry_time = bcast?2000:2000;
  struct timeval tval;
  struct packet_struct p;
  struct packet_struct *p2;
  struct nmb_packet *nmb = &p.packet.nmb;
  struct in_addr *ip_list = NULL;
	BOOL packet_type = NMB_PACKET;
	BOOL first_send = True;

	if (fd == -1)
	{
		retries = 1;
		packet_type = NMB_SOCK_PACKET;
		fd = get_nmb_sock();

		if (fd < 0)
		{
			return NULL;
		}
	}

  bzero((char *)&p,sizeof(p));
  (*count) = 0;

  if (!name_trn_id) name_trn_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) + 
    ((unsigned)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 = False;
  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 = packet_type;

     GetTimeOfDay(&tval);

  while (retries >= 0)
  {
    struct timeval tval2;

    GetTimeOfDay(&tval2);
    if (first_send || TvalDiff(&tval,&tval2) > retry_time)
    {
	first_send = False;
      if (!found && !send_packet(&p))
	{
		if (packet_type == NMB_SOCK_PACKET) close(fd);
        return NULL;
	}
      GetTimeOfDay(&tval);
    }

    if ((p2=receive_packet(fd,packet_type,90)))
    {     
      struct nmb_packet *nmb2 = &p2->packet.nmb;
      debug_nmb_packet(p2);

      if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
          !nmb2->header.response)
      {
	DEBUG(10,("packet not for us (received %d, expected %d\n",
      nmb2->header.name_trn_id, nmb->header.name_trn_id));
        /* 
         * Its not for us - maybe deal with it later 
         * (put it on the queue?).
         */
        if (fn) 
          fn(p2);
        else
          free_packet(p2);

        continue;
      }
	  
	retries--;

      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;
      }

      ip_list = (struct in_addr *)Realloc(ip_list, sizeof(ip_list[0]) * 
                                          ((*count)+nmb2->answers->rdlength/6));
      if (ip_list)
      {
        DEBUG(fn?3:2,("Got a positive name query response from %s ( ",
              inet_ntoa(p2->ip)));
        for (i=0;i<nmb2->answers->rdlength/6;i++)
        {
          putip((char *)&ip_list[(*count)],&nmb2->answers->rdata[2+i*6]);
          DEBUG(fn?3:2,("%s ",inet_ntoa(ip_list[(*count)])));
          (*count)++;
        }
        DEBUG(fn?3:2,(")\n"));
      }

      found=True;
      retries=0;
      free_packet(p2);
      if (fn)
        break;

      if(found)
	{
        DEBUG(10,("returning OK\n"));
        break;
        }
    }
  }

	if (packet_type == NMB_SOCK_PACKET) close(fd);
  return ip_list;
}

/********************************************************
 Start parsing the lmhosts file.
*********************************************************/

FILE *startlmhosts(char *fname)
{
  FILE *fp = sys_fopen(fname,"r");
  if (!fp) {
    DEBUG(4,("startlmhosts: Can't open lmhosts file %s. Error was %s\n",
             fname, strerror(errno)));
    return NULL;
  }
  return fp;
}

/********************************************************
 Parse the next line in the lmhosts file.
*********************************************************/
BOOL getlmhostsent( FILE *fp, pstring name, int *name_type, struct in_addr *ipaddr)
{
  pstring line;

  while(!feof(fp) && !ferror(fp)) {
    pstring ip,flags,extra;
    char *ptr;
    int count = 0;

    *name_type = -1;

    if (!fgets_slash(line,sizeof(pstring),fp))
      continue;

    if (*line == '#')
      continue;

    pstrcpy(ip,"");
    pstrcpy(name,"");
    pstrcpy(flags,"");

    ptr = line;

    if (next_token(&ptr,ip   ,NULL,sizeof(ip)))
      ++count;
    if (next_token(&ptr,name ,NULL, sizeof(pstring)))
      ++count;
    if (next_token(&ptr,flags,NULL, sizeof(flags)))
      ++count;
    if (next_token(&ptr,extra,NULL, sizeof(extra)))
      ++count;

    if (count <= 0)
      continue;

    if (count > 0 && count < 2)
    {
      DEBUG(0,("getlmhostsent: Ill formed hosts line [%s]\n",line));
      continue;
    }

    if (count >= 4)
    {
      DEBUG(0,("getlmhostsent: too many columns in lmhosts file (obsolete syntax)\n"));
      continue;
    }

    DEBUG(4, ("getlmhostsent: lmhost entry: %s %s %s\n", ip, name, flags));

    if (strchr(flags,'G') || strchr(flags,'S'))
    {
      DEBUG(0,("getlmhostsent: group flag in lmhosts ignored (obsolete)\n"));
      continue;
    }

    *ipaddr = *interpret_addr2(ip);

    /* Extra feature. If the name ends in '#XX', where XX is a hex number,
       then only add that name type. */
    if((ptr = strchr(name, '#')) != NULL)
    {
      char *endptr;

      ptr++;
      *name_type = (int)strtol(ptr, &endptr,0);

      if(!*ptr || (endptr == ptr))
      {
        DEBUG(0,("getlmhostsent: invalid name %s containing '#'.\n", name));
        continue;
      }

      *(--ptr) = '\0'; /* Truncate at the '#' */
    }

    return True;
  }

  return False;
}

/********************************************************
 Finish parsing the lmhosts file.
*********************************************************/

void endlmhosts(FILE *fp)
{
  fclose(fp);
}



/********************************************************
resolve via "bcast" method
*********************************************************/
static BOOL resolve_bcast(const char *name, struct in_addr *return_ip, int name_type)
{
	int sock, i;
	
	/*
	 * "bcast" means do a broadcast lookup on all the local interfaces.
	 */

	DEBUG(3,("resolve_name: Attempting broadcast lookup for name %s<0x20>\n", name));

	sock = open_socket_in( SOCK_DGRAM, 0, 3,
			       interpret_addr(lp_socket_address()) );

	if (sock != -1) {
		struct in_addr *iplist = NULL;
		int count;
		int num_interfaces = iface_count();
		set_socket_options(sock,"SO_BROADCAST");
		/*
		 * Lookup the name on all the interfaces, return on
		 * the first successful match.
		 */
		for( i = 0; i < num_interfaces; i++) {
			struct in_addr sendto_ip;
			/* Done this way to fix compiler error on IRIX 5.x */
			sendto_ip = *iface_bcast(*iface_n_ip(i));
			iplist = name_query(sock, name, name_type, True, 
					    True, sendto_ip, &count, NULL);
			if(iplist != NULL) {
				*return_ip = iplist[0];
				free((char *)iplist);
				close(sock);
				return True;
			}
		}
		close(sock);
	}

	return False;
}



/********************************************************
resolve via "wins" method
*********************************************************/
static BOOL resolve_wins(const char *name, struct in_addr *return_ip, int name_type)
{
      int sock;
      struct in_addr wins_ip;
      BOOL wins_ismyip;

      /*
       * "wins" means do a unicast lookup to the WINS server.
       * Ignore if there is no WINS server specified or if the
       * WINS server is one of our interfaces (if we're being
       * called from within nmbd - we can't do this call as we
       * would then block).
       */

      DEBUG(3,("resolve_name: Attempting wins lookup for name %s<0x20>\n", name));

      if(!*lp_wins_server()) {
	      DEBUG(3,("resolve_name: WINS server resolution selected and no WINS server present.\n"));
	      return False;
      }

      wins_ip = *interpret_addr2(lp_wins_server());
      wins_ismyip = ismyip(wins_ip);

      if((wins_ismyip && !global_in_nmbd) || !wins_ismyip) {
	      sock = open_socket_in( SOCK_DGRAM, 0, 3,
				     interpret_addr(lp_socket_address()) );
	      
	      if (sock != -1) {
		      struct in_addr *iplist = NULL;
		      int count;
		      iplist = name_query(sock, name, name_type, False, 
					  True, wins_ip, &count, NULL);
		      if(iplist != NULL) {
			      *return_ip = iplist[0];
			      free((char *)iplist);
			      close(sock);
			      return True;
		      }
		      close(sock);
	      }
      }

      return False;
}


/********************************************************
resolve via "lmhosts" method
*********************************************************/
static BOOL resolve_lmhosts(const char *name, struct in_addr *return_ip, int name_type)
{
	/*
	 * "lmhosts" means parse the local lmhosts file.
	 */
	
	FILE *fp;
	pstring lmhost_name;
	int name_type2;

	DEBUG(3,("resolve_name: Attempting lmhosts lookup for name %s\n", name));

	fp = startlmhosts( LMHOSTSFILE );
	if(fp) {
		while (getlmhostsent(fp, lmhost_name, &name_type2, return_ip)) {
			if (strequal(name, lmhost_name) && 
			    name_type == name_type2) {
				endlmhosts(fp);
				return True; 
			}
		}
		endlmhosts(fp);
	}
	return False;
}


/********************************************************
resolve via "hosts" method
*********************************************************/
static BOOL resolve_hosts(const char *name, struct in_addr *return_ip)
{
	/*
	 * "host" means do a localhost, or dns lookup.
	 */
	struct hostent *hp;

	DEBUG(3,("resolve_name: Attempting host lookup for name %s\n", name));
	
	if (((hp = Get_Hostbyname(name)) != NULL) && (hp->h_addr != NULL)) {
		putip((char *)return_ip,(char *)hp->h_addr);
		return True;
	}
	return False;
}


/********************************************************
 Resolve a name into an IP address. Use this function if
 the string is either an IP address, DNS or host name
 or NetBIOS name. This uses the name switch in the
 smb.conf to determine the order of name resolution.
*********************************************************/
BOOL is_ip_address(const char *name)
{
  int i;
  for (i=0; name[i]; i++)
    if (!(isdigit((int)name[i]) || name[i] == '.'))
	return False;
   
  return True;
}

/********************************************************
 Resolve a name into an IP address. Use this function if
 the string is either an IP address, DNS or host name
 or NetBIOS name. This uses the name switch in the
 smb.conf to determine the order of name resolution.
*********************************************************/
BOOL resolve_name(const char *name, struct in_addr *return_ip, int name_type)
{
  pstring name_resolve_list;
  fstring tok;
  char *ptr;

  if (strcmp(name,"0.0.0.0") == 0) {
    return_ip->s_addr = 0;
    return True;
  }
  if (strcmp(name,"255.255.255.255") == 0) {
    return_ip->s_addr = 0xFFFFFFFF;
    return True;
  }
   
  /* if it's in the form of an IP address then get the lib to interpret it */
  if (is_ip_address(name)) {
    return_ip->s_addr = inet_addr(name);
    return True;
  }

  pstrcpy(name_resolve_list, lp_name_resolve_order());
  ptr = name_resolve_list;
  if (!ptr || !*ptr) ptr = "host";

  while (next_token(&ptr, tok, LIST_SEP, sizeof(tok))) {
	  if((strequal(tok, "host") || strequal(tok, "hosts"))) {
		  if (name_type == 0x20 && resolve_hosts(name, return_ip)) {
			  return True;
		  }
	  } else if(strequal( tok, "lmhosts")) {
		  if (resolve_lmhosts(name, return_ip, name_type)) {
			  return True;
		  }
	  } else if(strequal( tok, "wins")) {
		  /* don't resolve 1D via WINS */
		  if (name_type != 0x1D &&
		      resolve_wins(name, return_ip, name_type)) {
			  return True;
		  }
	  } else if(strequal( tok, "bcast")) {
		  if (resolve_bcast(name, return_ip, name_type)) {
			  return True;
		  }
	  } else {
		  DEBUG(0,("resolve_name: unknown name switch type %s\n", tok));
	  }
  }

  return False;
}

/********************************************************
 resolve a name of format \\server_name or \\ipaddress
 into a name.  also, cut the \\ from the front for us.
*********************************************************/
BOOL resolve_srv_name(const char* srv_name, fstring dest_host,
				struct in_addr *ip)
{
	BOOL ret;
	const char *sv_name = srv_name;

	DEBUG(10,("resolve_srv_name: %s\n", srv_name));

	if (srv_name == NULL || strequal("\\\\.", srv_name))
	{
		fstrcpy(dest_host, global_myname);
		ip = interpret_addr2("127.0.0.1");
		return True;
	}

	if (strnequal("\\\\", srv_name, 2))
	{
		sv_name = &srv_name[2];
	}

	fstrcpy(dest_host, sv_name);
	ret = resolve_name(dest_host, ip, 0x20);
	
	if (is_ip_address(dest_host))
	{
		fstrcpy(dest_host, "*SMBSERVER");
	}
	
	return ret;
}

/********************************************************
find the IP address of the master browser or DMB for a workgroup
*********************************************************/
BOOL find_master_ip(char *group, struct in_addr *master_ip)
{
	if (resolve_name(group, master_ip, 0x1D)) return True;

	return resolve_name(group, master_ip, 0x1B);
}