summaryrefslogtreecommitdiff
path: root/source4/nbt_server/wins/winsclient.c
blob: 3c599022d416e08c4a65cfd39b3b47e749792d1f (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
/* 
   Unix SMB/CIFS implementation.

   wins client name registration and refresh

   Copyright (C) Andrew Tridgell	2005
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "nbt_server/nbt_server.h"
#include "nbt_server/wins/winsserver.h"
#include "libcli/composite/composite.h"
#include "lib/events/events.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "smbd/service_task.h"

static void nbtd_wins_refresh_handler(struct composite_context *c);

/* we send WINS client requests using our primary network interface 
*/
static struct nbt_name_socket *wins_socket(struct nbtd_interface *iface)
{
	struct nbtd_server *nbtsrv = iface->nbtsrv;
	return nbtsrv->interfaces->nbtsock;
}


static void nbtd_wins_refresh(struct event_context *ev, struct timed_event *te,
			      struct timeval t, void *private_data);

/*
  retry a WINS name registration
*/
static void nbtd_wins_register_retry(struct event_context *ev, struct timed_event *te,
				     struct timeval t, void *private_data)
{
	struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
	nbtd_winsclient_register(iname);
}

/*
  start a timer to refresh this name
*/
static void nbtd_wins_start_refresh_timer(struct nbtd_iface_name *iname)
{
	uint32_t refresh_time;
	uint32_t max_refresh_time = lp_parm_int(-1, "nbtd", "max_refresh_time", 7200);

	refresh_time = MIN(max_refresh_time, iname->ttl/2);
	
	event_add_timed(iname->iface->nbtsrv->task->event_ctx, 
			iname, 
			timeval_add(&iname->registration_time, refresh_time, 0),
			nbtd_wins_refresh, iname);
}

/*
  called when a wins name refresh has completed
*/
static void nbtd_wins_refresh_handler(struct composite_context *c)
{
	NTSTATUS status;
	struct nbt_name_refresh_wins io;
	struct nbtd_iface_name *iname = talloc_get_type(c->async.private_data, 
							struct nbtd_iface_name);
	TALLOC_CTX *tmp_ctx = talloc_new(iname);

	status = nbt_name_refresh_wins_recv(c, tmp_ctx, &io);
	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
		/* our WINS server is dead - start registration over
		   from scratch */
		DEBUG(2,("Failed to refresh %s with WINS server %s\n",
			 nbt_name_string(tmp_ctx, &iname->name), iname->wins_server));
		talloc_free(tmp_ctx);
		nbtd_winsclient_register(iname);
		return;
	}

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1,("Name refresh failure with WINS for %s - %s\n", 
			 nbt_name_string(tmp_ctx, &iname->name), nt_errstr(status)));
		talloc_free(tmp_ctx);
		return;
	}

	if (io.out.rcode != 0) {
		DEBUG(1,("WINS server %s rejected name refresh of %s - %s\n", 
			 io.out.wins_server, nbt_name_string(tmp_ctx, &iname->name), 
			 nt_errstr(nbt_rcode_to_ntstatus(io.out.rcode))));
		iname->nb_flags |= NBT_NM_CONFLICT;
		talloc_free(tmp_ctx);
		return;
	}	

	DEBUG(4,("Refreshed name %s with WINS server %s\n",
		 nbt_name_string(tmp_ctx, &iname->name), iname->wins_server));
	/* success - start a periodic name refresh */
	iname->nb_flags |= NBT_NM_ACTIVE;
	if (iname->wins_server) {
		/*
		 * talloc_free() would generate a warning,
		 * so steal it into the tmp context
		 */
		talloc_steal(tmp_ctx, iname->wins_server);
	}
	iname->wins_server = talloc_steal(iname, io.out.wins_server);

	iname->registration_time = timeval_current();
	nbtd_wins_start_refresh_timer(iname);

	talloc_free(tmp_ctx);
}


/*
  refresh a WINS name registration
*/
static void nbtd_wins_refresh(struct event_context *ev, struct timed_event *te,
			      struct timeval t, void *private_data)
{
	struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
	struct nbtd_interface *iface = iname->iface;
	struct nbt_name_refresh_wins io;
	struct composite_context *c;
	TALLOC_CTX *tmp_ctx = talloc_new(iname);

	/* setup a wins name refresh request */
	io.in.name            = iname->name;
	io.in.wins_servers    = str_list_make(tmp_ctx, iname->wins_server, NULL);
	io.in.addresses       = nbtd_address_list(iface, tmp_ctx);
	io.in.nb_flags        = iname->nb_flags;
	io.in.ttl             = iname->ttl;

	if (!io.in.addresses) {
		talloc_free(tmp_ctx);
		return;
	}

	c = nbt_name_refresh_wins_send(wins_socket(iface), &io);
	if (c == NULL) {
		talloc_free(tmp_ctx);
		return;
	}
	talloc_steal(c, io.in.addresses);

	c->async.fn = nbtd_wins_refresh_handler;
	c->async.private_data = iname;

	talloc_free(tmp_ctx);
}


/*
  called when a wins name register has completed
*/
static void nbtd_wins_register_handler(struct composite_context *c)
{
	NTSTATUS status;
	struct nbt_name_register_wins io;
	struct nbtd_iface_name *iname = talloc_get_type(c->async.private_data, 
							struct nbtd_iface_name);
	TALLOC_CTX *tmp_ctx = talloc_new(iname);

	status = nbt_name_register_wins_recv(c, tmp_ctx, &io);
	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
		/* none of the WINS servers responded - try again 
		   periodically */
		int wins_retry_time = lp_parm_int(-1, "nbtd", "wins_retry", 300);
		event_add_timed(iname->iface->nbtsrv->task->event_ctx, 
				iname,
				timeval_current_ofs(wins_retry_time, 0),
				nbtd_wins_register_retry,
				iname);
		talloc_free(tmp_ctx);
		return;
	}

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1,("Name register failure with WINS for %s - %s\n", 
			 nbt_name_string(tmp_ctx, &iname->name), nt_errstr(status)));
		talloc_free(tmp_ctx);
		return;
	}	

	if (io.out.rcode != 0) {
		DEBUG(1,("WINS server %s rejected name register of %s - %s\n", 
			 io.out.wins_server, nbt_name_string(tmp_ctx, &iname->name), 
			 nt_errstr(nbt_rcode_to_ntstatus(io.out.rcode))));
		iname->nb_flags |= NBT_NM_CONFLICT;
		talloc_free(tmp_ctx);
		return;
	}	

	/* success - start a periodic name refresh */
	iname->nb_flags |= NBT_NM_ACTIVE;
	if (iname->wins_server) {
		/*
		 * talloc_free() would generate a warning,
		 * so steal it into the tmp context
		 */
		talloc_steal(tmp_ctx, iname->wins_server);
	}
	iname->wins_server = talloc_steal(iname, io.out.wins_server);

	iname->registration_time = timeval_current();
	nbtd_wins_start_refresh_timer(iname);

	DEBUG(3,("Registered %s with WINS server %s\n",
		 nbt_name_string(tmp_ctx, &iname->name), iname->wins_server));

	talloc_free(tmp_ctx);
}

/*
  register a name with our WINS servers
*/
void nbtd_winsclient_register(struct nbtd_iface_name *iname)
{
	struct nbtd_interface *iface = iname->iface;
	struct nbt_name_register_wins io;
	struct composite_context *c;

	/* setup a wins name register request */
	io.in.name            = iname->name;
	io.in.wins_servers    = lp_wins_server_list();
	io.in.addresses       = nbtd_address_list(iface, iname);
	io.in.nb_flags        = iname->nb_flags;
	io.in.ttl             = iname->ttl;

	if (!io.in.addresses) {
		return;
	}

	c = nbt_name_register_wins_send(wins_socket(iface), &io);
	if (c == NULL) {
		talloc_free(io.in.addresses);
		return;
	}
	talloc_steal(c, io.in.addresses);

	c->async.fn = nbtd_wins_register_handler;
	c->async.private_data = iname;
}