summaryrefslogtreecommitdiff
path: root/source3/namedbsubnet.c
blob: 367179b6c613c6b19a316d8fc401011c7f727cd8 (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
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   NBT netbios routines and daemon - version 2
   Copyright (C) Andrew Tridgell 1994-1996
   
   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.
   
   Revision History:

   14 jan 96: lkcl@pires.co.uk
   added multiple workgroup domain master support

   04 jul 96: lkcl@pires.co.uk
   created module namedbsubnet containing subnet database functions

*/

#include "includes.h"
#include "smb.h"

extern int ClientNMB;
extern int ClientDGRAM;

extern int DEBUGLEVEL;

extern struct in_addr ipgrp;
extern struct in_addr ipzero;

extern pstring myname;

BOOL updatedlists = True;
int updatecount = 0;

/* local interfaces structure */
extern struct interface *local_interfaces;

/* this is our domain/workgroup/server database */
struct subnet_record *subnetlist = NULL;

extern uint16 nb_type; /* samba's NetBIOS name type */

/****************************************************************************
  add a domain into the list
  **************************************************************************/
static void add_subnet(struct subnet_record *d)
{
  struct subnet_record *d2;

  if (!subnetlist)
  {
    subnetlist = d;
    d->prev = NULL;
    d->next = NULL;
    return;
  }

  for (d2 = subnetlist; d2->next; d2 = d2->next);

  d2->next = d;
  d->next = NULL;
  d->prev = d2;
}


/****************************************************************************
  find a subnet in the subnetlist 
  **************************************************************************/
struct subnet_record *find_subnet(struct in_addr bcast_ip)
{   
  struct subnet_record *d;
  struct in_addr wins_ip = ipgrp;
  
  /* search through subnet list for broadcast/netmask that matches
     the source ip address. a subnet 255.255.255.255 represents the
     WINS list. */
  
	for (d = subnetlist; d; d = d->next)
    {
        if (ip_equal(bcast_ip, wins_ip))
	    {
			if (ip_equal(bcast_ip, d->bcast_ip))
			{
				return d;
			}
        }
        else if (same_net(bcast_ip, d->bcast_ip, d->mask_ip))
	    {
			if (!ip_equal(d->bcast_ip, wins_ip))
			{
				return d;
			}
	    }
    }
  
	return (NULL);
}


/****************************************************************************
  finds the appropriate subnet structure. directed packets (non-bcast) are
  assumed to come from a point-to-point (P or M node), and so the subnet we
  return in this instance is the WINS 'pseudo-subnet' with ip 255.255.255.255
  ****************************************************************************/
struct subnet_record *find_req_subnet(struct in_addr ip, BOOL bcast)
{
  if (bcast)
  {
    /* identify the subnet the broadcast request came from */
    return find_subnet(*iface_bcast(ip));
  }
  /* find the subnet under the pseudo-ip of 255.255.255.255 */
  return find_subnet(ipgrp);
}


/****************************************************************************
  create a domain entry
  ****************************************************************************/
static struct subnet_record *make_subnet(struct in_addr bcast_ip, struct in_addr mask_ip)
{
  struct subnet_record *d;
  d = (struct subnet_record *)malloc(sizeof(*d));
  
  if (!d) return(NULL);
  
  bzero((char *)d,sizeof(*d));
  
  DEBUG(4, ("making subnet %s ", inet_ntoa(bcast_ip)));
  DEBUG(4, ("%s\n", inet_ntoa(mask_ip)));
  
  d->bcast_ip = bcast_ip;
  d->mask_ip  = mask_ip;
  d->workgrouplist = NULL;
  
  add_subnet(d);
  
  return d;
}


/****************************************************************************
  add the remote interfaces from lp_interfaces()
  to the netbios subnet database.
  ****************************************************************************/
void add_subnet_interfaces(void)
{
	struct interface *i;

	/* loop on all local interfaces */
	for (i = local_interfaces; i; i = i->next)
	{
		/* add the interface into our subnet database */
		if (!find_subnet(i->bcast))
		{
		  make_subnet(i->bcast,i->nmask);
		}
	}

	/* add the pseudo-ip interface for WINS: 255.255.255.255 */
	if (lp_wins_support() || (*lp_wins_server()))
    {
		struct in_addr wins_bcast = ipgrp;
		struct in_addr wins_nmask = ipzero;
		make_subnet(wins_bcast, wins_nmask);
    }
}



/****************************************************************************
  add the default workgroup into my domain
  **************************************************************************/
void add_my_subnets(char *group)
{
  struct interface *i;

  /* add or find domain on our local subnet, in the default workgroup */
  
  if (*group == '*') return;

	/* the coding choice is up to you, andrew: i can see why you don't want
       global access to the local_interfaces structure: so it can't get
       messed up! */
    for (i = local_interfaces; i; i = i->next)
    {
      add_subnet_entry(i->bcast,i->nmask,group, True, False);
    }
}


/****************************************************************************
  add a domain entry. creates a workgroup, if necessary, and adds the domain
  to the named a workgroup.
  ****************************************************************************/
struct subnet_record *add_subnet_entry(struct in_addr bcast_ip, 
				       struct in_addr mask_ip,
				       char *name, BOOL add, BOOL lmhosts)
{
  struct subnet_record *d;

  /* XXXX andrew: struct in_addr ip appears not to be referenced at all except
     in the DEBUG comment. i assume that the DEBUG comment below actually
     intends to refer to bcast_ip? i don't know.

  struct in_addr ip = ipgrp;

  */

  if (zero_ip(bcast_ip)) 
    bcast_ip = *iface_bcast(bcast_ip);
  
  /* add the domain into our domain database */
  if ((d = find_subnet(bcast_ip)) ||
      (d = make_subnet(bcast_ip, mask_ip)))
    {
      struct work_record *w = find_workgroupstruct(d, name, add);
      
      if (!w) return NULL;

      /* add WORKGROUP(1e) and WORKGROUP(00) entries into name database
	 or register with WINS server, if it's our workgroup */
      if (strequal(lp_workgroup(), name))
	{
	  add_my_name_entry(d,name,0x1e,nb_type|NB_ACTIVE|NB_GROUP);
	  add_my_name_entry(d,name,0x0 ,nb_type|NB_ACTIVE|NB_GROUP);
	}
      /* add samba server name to workgroup list. don't add
         lmhosts server entries to local interfaces */
      if (strequal(lp_workgroup(), name))
      {
	add_server_entry(d,w,myname,w->ServerType,0,lp_serverstring(),True);
        DEBUG(3,("Added server name entry %s at %s\n",
                  name,inet_ntoa(bcast_ip)));
      }
      
      return d;
    }
  return NULL;
}


/*******************************************************************
  write out browse.dat
  ******************************************************************/
void write_browse_list(time_t t)
{
  struct subnet_record *d;
  pstring fname,fnamenew;
  FILE *f;

  static time_t lasttime = 0;

  if (!lasttime) lasttime = t;
  if (!updatedlists || t - lasttime < 5) return;
  
  lasttime = t;
  updatedlists = False;
  updatecount++;
  
  dump_names();
  dump_workgroups();
  
  strcpy(fname,lp_lockdir());
  trim_string(fname,NULL,"/");
  strcat(fname,"/");
  strcat(fname,SERVER_LIST);
  strcpy(fnamenew,fname);
  strcat(fnamenew,".");
  
  f = fopen(fnamenew,"w");
  
  if (!f)
    {
      DEBUG(4,("Can't open %s - %s\n",fnamenew,strerror(errno)));
      return;
    }
  
  for (d = subnetlist; d ; d = d->next)
    {
      struct work_record *work;
      for (work = d->workgrouplist; work ; work = work->next)
	{
	  struct server_record *s;
	  for (s = work->serverlist; s ; s = s->next)
	    {
	      fstring tmp;
	      
	      /* don't list domains I don't have a master for */
	      if ((s->serv.type & SV_TYPE_DOMAIN_ENUM) && !s->serv.comment[0])
		{
		  continue;
		}
	      
	      /* output server details, plus what workgroup/domain
		 they're in. without the domain information, the
		 combined list of all servers in all workgroups gets
		 sent to anyone asking about any workgroup! */
	      
	      sprintf(tmp, "\"%s\"", s->serv.name);
	      fprintf(f, "%-25s ", tmp);
	      fprintf(f, "%08x ", s->serv.type);
	      sprintf(tmp, "\"%s\" ", s->serv.comment);
	      fprintf(f, "%-30s", tmp);
	      fprintf(f, "\"%s\"\n", work->work_group);
	    }
	}
    }
  
  fclose(f);
  unlink(fname);
  chmod(fnamenew,0644);
  rename(fnamenew,fname);   
  DEBUG(3,("Wrote browse list %s\n",fname));
}