summaryrefslogtreecommitdiff
path: root/source4/libcli/nbt/namerefresh.c
blob: 3114cb2b10028854cabc63502b95baeb1459886c (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
/* 
   Unix SMB/CIFS implementation.

   send out a name refresh request

   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 "libcli/nbt/libnbt.h"
#include "libcli/composite/composite.h"
#include "lib/socket/socket.h"
#include "param/param.h"

/*
  send a nbt name refresh request
*/
struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock,
					       struct nbt_name_refresh *io)
{
	struct nbt_name_request *req;
	struct nbt_name_packet *packet;
	struct socket_address *dest;

	packet = talloc_zero(nbtsock, struct nbt_name_packet);
	if (packet == NULL) return NULL;

	packet->qdcount = 1;
	packet->arcount = 1;
	packet->operation = NBT_OPCODE_REFRESH;
	if (io->in.broadcast) {
		packet->operation |= NBT_FLAG_BROADCAST;
	}

	packet->questions = talloc_array(packet, struct nbt_name_question, 1);
	if (packet->questions == NULL) goto failed;

	packet->questions[0].name           = io->in.name;
	packet->questions[0].question_type  = NBT_QTYPE_NETBIOS;
	packet->questions[0].question_class = NBT_QCLASS_IP;

	packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
	if (packet->additional == NULL) goto failed;

	packet->additional[0].name                   = io->in.name;
	packet->additional[0].rr_type                = NBT_QTYPE_NETBIOS;
	packet->additional[0].rr_class               = NBT_QCLASS_IP;
	packet->additional[0].ttl                    = io->in.ttl;
	packet->additional[0].rdata.netbios.length   = 6;
	packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
								     struct nbt_rdata_address, 1);
	if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
	packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
	packet->additional[0].rdata.netbios.addresses[0].ipaddr = 
		talloc_strdup(packet->additional, io->in.address);

	dest = socket_address_from_strings(nbtsock, 
					   nbtsock->sock->backend_name, 
					   io->in.dest_addr, lp_nbt_port(global_loadparm));
	if (dest == NULL) goto failed;
	req = nbt_name_request_send(nbtsock, dest, packet,
				    io->in.timeout, io->in.retries, False);
	if (req == NULL) goto failed;

	talloc_free(packet);
	return req;

failed:
	talloc_free(packet);
	return NULL;	
}

/*
  wait for a refresh reply
*/
NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req, 
			       TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
{
	NTSTATUS status;
	struct nbt_name_packet *packet;

	status = nbt_name_request_recv(req);
	if (!NT_STATUS_IS_OK(status) ||
	    req->num_replies == 0) {
		talloc_free(req);
		return status;
	}
	
	packet = req->replies[0].packet;
	io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);

	if (packet->ancount != 1 ||
	    packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
	    packet->answers[0].rr_class != NBT_QCLASS_IP) {
		talloc_free(req);
		return NT_STATUS_INVALID_NETWORK_RESPONSE;
	}

	io->out.rcode = packet->operation & NBT_RCODE;
	io->out.name = packet->answers[0].name;
	if (packet->answers[0].rdata.netbios.length < 6) {
		talloc_free(req);
		return NT_STATUS_INVALID_NETWORK_RESPONSE;
	}
	io->out.reply_addr = talloc_steal(mem_ctx, 
					  packet->answers[0].rdata.netbios.addresses[0].ipaddr);
	talloc_steal(mem_ctx, io->out.name.name);
	talloc_steal(mem_ctx, io->out.name.scope);

	talloc_free(req);

	return NT_STATUS_OK;
}

/*
  synchronous name refresh request
*/
NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock, 
			   TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
{
	struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
	return nbt_name_refresh_recv(req, mem_ctx, io);
}



/*
  a wins name refresh with multiple WINS servers and multiple
  addresses to refresh. Try each WINS server in turn, until we get a
  reply for each address
*/
struct refresh_wins_state {
	struct nbt_name_socket *nbtsock;
	struct nbt_name_refresh *io;
	const char **wins_servers;
	const char **addresses;
	int address_idx;
	struct nbt_name_request *req;
};


/*
  state handler for WINS multi-homed multi-server name refresh
*/
static void name_refresh_wins_handler(struct nbt_name_request *req)
{
	struct composite_context *c = talloc_get_type(req->async.private, 
						      struct composite_context);
	struct refresh_wins_state *state = talloc_get_type(c->private_data, 
							    struct refresh_wins_state);
	NTSTATUS status;

	status = nbt_name_refresh_recv(state->req, state, state->io);
	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
		/* the refresh timed out - try the next WINS server */
		state->wins_servers++;
		state->address_idx = 0;
		if (state->wins_servers[0] == NULL) {
			c->state = COMPOSITE_STATE_ERROR;
			c->status = status;
			goto done;
		}
		state->io->in.dest_addr = state->wins_servers[0];
		state->io->in.address   = state->addresses[0];
		state->req = nbt_name_refresh_send(state->nbtsock, state->io);
		if (state->req == NULL) {
			c->state = COMPOSITE_STATE_ERROR;
			c->status = NT_STATUS_NO_MEMORY;
		} else {
			state->req->async.fn      = name_refresh_wins_handler;
			state->req->async.private = c;
		}
	} else if (!NT_STATUS_IS_OK(status)) {
		c->state = COMPOSITE_STATE_ERROR;
		c->status = status;
	} else {
		if (state->io->out.rcode == 0 &&
		    state->addresses[state->address_idx+1] != NULL) {
			/* refresh our next address */
			state->io->in.address = state->addresses[++(state->address_idx)];
			state->req = nbt_name_refresh_send(state->nbtsock, state->io);
			if (state->req == NULL) {
				c->state = COMPOSITE_STATE_ERROR;
				c->status = NT_STATUS_NO_MEMORY;
			} else {
				state->req->async.fn      = name_refresh_wins_handler;
				state->req->async.private = c;
			}
		} else {
			c->state = COMPOSITE_STATE_DONE;
			c->status = NT_STATUS_OK;
		}
	}

done:
	if (c->state >= COMPOSITE_STATE_DONE &&
	    c->async.fn) {
		c->async.fn(c);
	}
}

/*
  the async send call for a multi-server WINS refresh
*/
struct composite_context *nbt_name_refresh_wins_send(struct nbt_name_socket *nbtsock,
						      struct nbt_name_refresh_wins *io)
{
	struct composite_context *c;
	struct refresh_wins_state *state;

	c = talloc_zero(nbtsock, struct composite_context);
	if (c == NULL) goto failed;

	state = talloc(c, struct refresh_wins_state);
	if (state == NULL) goto failed;

	state->io = talloc(state, struct nbt_name_refresh);
	if (state->io == NULL) goto failed;

	state->wins_servers = str_list_copy(state, io->in.wins_servers);
	if (state->wins_servers == NULL || 
	    state->wins_servers[0] == NULL) goto failed;

	state->addresses = str_list_copy(state, io->in.addresses);
	if (state->addresses == NULL || 
	    state->addresses[0] == NULL) goto failed;

	state->io->in.name            = io->in.name;
	state->io->in.dest_addr       = state->wins_servers[0];
	state->io->in.address         = io->in.addresses[0];
	state->io->in.nb_flags        = io->in.nb_flags;
	state->io->in.broadcast       = False;
	state->io->in.ttl             = io->in.ttl;
	state->io->in.timeout         = 2;
	state->io->in.retries         = 2;

	state->nbtsock     = nbtsock;
	state->address_idx = 0;

	state->req = nbt_name_refresh_send(nbtsock, state->io);
	if (state->req == NULL) goto failed;

	state->req->async.fn      = name_refresh_wins_handler;
	state->req->async.private = c;

	c->private_data	= state;
	c->state	= COMPOSITE_STATE_IN_PROGRESS;
	c->event_ctx	= nbtsock->event_ctx;

	return c;

failed:
	talloc_free(c);
	return NULL;
}

/*
  multi-homed WINS name refresh - recv side
*/
NTSTATUS nbt_name_refresh_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
				     struct nbt_name_refresh_wins *io)
{
	NTSTATUS status;
	status = composite_wait(c);
	if (NT_STATUS_IS_OK(status)) {
		struct refresh_wins_state *state = 
			talloc_get_type(c->private_data, struct refresh_wins_state);
		io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
		io->out.rcode = state->io->out.rcode;
	}
	talloc_free(c);
	return status;
}

/*
  multi-homed WINS refresh - sync interface
*/
NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
				TALLOC_CTX *mem_ctx,
				struct nbt_name_refresh_wins *io)
{
	struct composite_context *c = nbt_name_refresh_wins_send(nbtsock, io);
	return nbt_name_refresh_wins_recv(c, mem_ctx, io);
}