Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 :
4 : send out a name registration request
5 :
6 : Copyright (C) Andrew Tridgell 2005
7 :
8 : This program is free software; you can redistribute it and/or modify
9 : it under the terms of the GNU General Public License as published by
10 : the Free Software Foundation; either version 3 of the License, or
11 : (at your option) any later version.
12 :
13 : This program is distributed in the hope that it will be useful,
14 : but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : GNU General Public License for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with this program. If not, see <http://www.gnu.org/licenses/>.
20 : */
21 :
22 : #include "includes.h"
23 : #include <tevent.h>
24 : #include "../libcli/nbt/libnbt.h"
25 : #include "../libcli/nbt/nbt_proto.h"
26 : #include "lib/socket/socket.h"
27 : #include "librpc/gen_ndr/ndr_nbt.h"
28 : #include "../lib/util/tevent_ntstatus.h"
29 :
30 : /*
31 : send a nbt name registration request
32 : */
33 1368 : struct nbt_name_request *nbt_name_register_send(struct nbt_name_socket *nbtsock,
34 : struct nbt_name_register *io)
35 : {
36 35 : struct nbt_name_request *req;
37 35 : struct nbt_name_packet *packet;
38 35 : struct socket_address *dest;
39 :
40 1368 : packet = talloc_zero(nbtsock, struct nbt_name_packet);
41 1368 : if (packet == NULL) return NULL;
42 :
43 1368 : packet->qdcount = 1;
44 1368 : packet->arcount = 1;
45 1368 : if (io->in.multi_homed) {
46 348 : packet->operation = NBT_OPCODE_MULTI_HOME_REG;
47 : } else {
48 1020 : packet->operation = NBT_OPCODE_REGISTER;
49 : }
50 1368 : if (io->in.broadcast) {
51 776 : packet->operation |= NBT_FLAG_BROADCAST;
52 : }
53 1368 : if (io->in.register_demand) {
54 386 : packet->operation |= NBT_FLAG_RECURSION_DESIRED;
55 : }
56 :
57 1368 : packet->questions = talloc_array(packet, struct nbt_name_question, 1);
58 1368 : if (packet->questions == NULL) goto failed;
59 :
60 1368 : packet->questions[0].name = io->in.name;
61 1368 : packet->questions[0].question_type = NBT_QTYPE_NETBIOS;
62 1368 : packet->questions[0].question_class = NBT_QCLASS_IP;
63 :
64 1368 : packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
65 1368 : if (packet->additional == NULL) goto failed;
66 :
67 1368 : packet->additional[0].name = io->in.name;
68 1368 : packet->additional[0].rr_type = NBT_QTYPE_NETBIOS;
69 1368 : packet->additional[0].rr_class = NBT_QCLASS_IP;
70 1368 : packet->additional[0].ttl = io->in.ttl;
71 1368 : packet->additional[0].rdata.netbios.length = 6;
72 1368 : packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
73 : struct nbt_rdata_address, 1);
74 1368 : if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
75 1368 : packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
76 2736 : packet->additional[0].rdata.netbios.addresses[0].ipaddr =
77 1368 : talloc_strdup(packet->additional, io->in.address);
78 1368 : if (packet->additional[0].rdata.netbios.addresses[0].ipaddr == NULL) goto failed;
79 :
80 1403 : dest = socket_address_from_strings(packet, nbtsock->sock->backend_name,
81 1368 : io->in.dest_addr, io->in.dest_port);
82 1368 : if (dest == NULL) goto failed;
83 1368 : req = nbt_name_request_send(nbtsock, nbtsock, dest, packet,
84 : io->in.timeout, io->in.retries, false);
85 1368 : if (req == NULL) goto failed;
86 :
87 1368 : talloc_free(packet);
88 1368 : return req;
89 :
90 0 : failed:
91 0 : talloc_free(packet);
92 0 : return NULL;
93 : }
94 :
95 : /*
96 : wait for a registration reply
97 : */
98 1368 : _PUBLIC_ NTSTATUS nbt_name_register_recv(struct nbt_name_request *req,
99 : TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
100 : {
101 35 : NTSTATUS status;
102 35 : struct nbt_name_packet *packet;
103 :
104 1368 : status = nbt_name_request_recv(req);
105 1368 : if (!NT_STATUS_IS_OK(status) ||
106 213 : req->num_replies == 0) {
107 1155 : talloc_free(req);
108 1155 : return status;
109 : }
110 :
111 213 : packet = req->replies[0].packet;
112 213 : io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
113 :
114 213 : if (packet->ancount != 1 ||
115 213 : packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
116 212 : packet->answers[0].rr_class != NBT_QCLASS_IP) {
117 0 : talloc_free(req);
118 0 : return NT_STATUS_INVALID_NETWORK_RESPONSE;
119 : }
120 :
121 213 : io->out.rcode = packet->operation & NBT_RCODE;
122 213 : io->out.name = packet->answers[0].name;
123 213 : if (packet->answers[0].rdata.netbios.length < 6) {
124 0 : talloc_free(req);
125 0 : return NT_STATUS_INVALID_NETWORK_RESPONSE;
126 : }
127 213 : io->out.reply_addr = talloc_steal(mem_ctx,
128 : packet->answers[0].rdata.netbios.addresses[0].ipaddr);
129 213 : talloc_steal(mem_ctx, io->out.name.name);
130 213 : talloc_steal(mem_ctx, io->out.name.scope);
131 :
132 213 : talloc_free(req);
133 :
134 213 : return NT_STATUS_OK;
135 : }
136 :
137 : /*
138 : synchronous name registration request
139 : */
140 68 : _PUBLIC_ NTSTATUS nbt_name_register(struct nbt_name_socket *nbtsock,
141 : TALLOC_CTX *mem_ctx, struct nbt_name_register *io)
142 : {
143 68 : struct nbt_name_request *req = nbt_name_register_send(nbtsock, io);
144 68 : return nbt_name_register_recv(req, mem_ctx, io);
145 : }
146 :
147 :
148 : /*
149 : a 4 step broadcast registration. 3 lots of name registration requests, followed by
150 : a name registration demand
151 : */
152 : struct nbt_name_register_bcast_state {
153 : struct nbt_name_socket *nbtsock;
154 : struct nbt_name_register io;
155 : };
156 :
157 : static void nbt_name_register_bcast_handler(struct nbt_name_request *subreq);
158 :
159 : /*
160 : the async send call for a 4 stage name registration
161 : */
162 389 : _PUBLIC_ struct tevent_req *nbt_name_register_bcast_send(TALLOC_CTX *mem_ctx,
163 : struct tevent_context *ev,
164 : struct nbt_name_socket *nbtsock,
165 : struct nbt_name_register_bcast *io)
166 : {
167 12 : struct tevent_req *req;
168 12 : struct nbt_name_register_bcast_state *state;
169 12 : struct nbt_name_request *subreq;
170 :
171 389 : req = tevent_req_create(mem_ctx, &state,
172 : struct nbt_name_register_bcast_state);
173 389 : if (req == NULL) {
174 0 : return NULL;
175 : }
176 :
177 389 : state->io.in.name = io->in.name;
178 389 : state->io.in.dest_addr = io->in.dest_addr;
179 389 : state->io.in.dest_port = io->in.dest_port;
180 389 : state->io.in.address = io->in.address;
181 389 : state->io.in.nb_flags = io->in.nb_flags;
182 389 : state->io.in.register_demand = false;
183 389 : state->io.in.broadcast = true;
184 389 : state->io.in.multi_homed = false;
185 389 : state->io.in.ttl = io->in.ttl;
186 389 : state->io.in.timeout = 1;
187 389 : state->io.in.retries = 2;
188 :
189 389 : state->nbtsock = nbtsock;
190 :
191 389 : subreq = nbt_name_register_send(nbtsock, &state->io);
192 389 : if (tevent_req_nomem(subreq, req)) {
193 0 : return tevent_req_post(req, ev);
194 : }
195 :
196 389 : subreq->async.fn = nbt_name_register_bcast_handler;
197 389 : subreq->async.private_data = req;
198 :
199 389 : return req;
200 : }
201 :
202 772 : static void nbt_name_register_bcast_handler(struct nbt_name_request *subreq)
203 : {
204 23 : struct tevent_req *req =
205 772 : talloc_get_type_abort(subreq->async.private_data,
206 : struct tevent_req);
207 23 : struct nbt_name_register_bcast_state *state =
208 772 : tevent_req_data(req,
209 : struct nbt_name_register_bcast_state);
210 23 : NTSTATUS status;
211 :
212 772 : status = nbt_name_register_recv(subreq, state, &state->io);
213 772 : if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
214 766 : if (state->io.in.register_demand == true) {
215 383 : tevent_req_done(req);
216 755 : return;
217 : }
218 :
219 : /* the registration timed out - good, send the demand */
220 383 : state->io.in.register_demand = true;
221 383 : state->io.in.retries = 0;
222 :
223 383 : subreq = nbt_name_register_send(state->nbtsock, &state->io);
224 383 : if (tevent_req_nomem(subreq, req)) {
225 0 : return;
226 : }
227 :
228 383 : subreq->async.fn = nbt_name_register_bcast_handler;
229 383 : subreq->async.private_data = req;
230 383 : return;
231 : }
232 :
233 6 : if (!NT_STATUS_IS_OK(status)) {
234 0 : tevent_req_nterror(req, status);
235 0 : return;
236 : }
237 :
238 6 : DEBUG(3,("Name registration conflict from %s for %s with ip %s - rcode %d\n",
239 : state->io.out.reply_from,
240 : nbt_name_string(state, &state->io.out.name),
241 : state->io.out.reply_addr,
242 : state->io.out.rcode));
243 :
244 6 : tevent_req_nterror(req, NT_STATUS_CONFLICTING_ADDRESSES);
245 : }
246 :
247 : /*
248 : broadcast 4 part name register - recv
249 : */
250 389 : _PUBLIC_ NTSTATUS nbt_name_register_bcast_recv(struct tevent_req *req)
251 : {
252 12 : NTSTATUS status;
253 :
254 389 : if (tevent_req_is_nterror(req, &status)) {
255 6 : tevent_req_received(req);
256 6 : return status;
257 : }
258 :
259 383 : tevent_req_received(req);
260 383 : return NT_STATUS_OK;
261 : }
262 :
263 : /*
264 : broadcast 4 part name register - sync interface
265 : */
266 0 : NTSTATUS nbt_name_register_bcast(struct nbt_name_socket *nbtsock,
267 : struct nbt_name_register_bcast *io)
268 : {
269 0 : TALLOC_CTX *frame = talloc_stackframe();
270 0 : struct tevent_context *ev;
271 0 : struct tevent_req *subreq;
272 0 : NTSTATUS status;
273 :
274 : /*
275 : * TODO: create a temporary event context
276 : */
277 0 : ev = nbtsock->event_ctx;
278 :
279 0 : subreq = nbt_name_register_bcast_send(frame, ev, nbtsock, io);
280 0 : if (subreq == NULL) {
281 0 : talloc_free(frame);
282 0 : return NT_STATUS_NO_MEMORY;
283 : }
284 :
285 0 : if (!tevent_req_poll(subreq, ev)) {
286 0 : status = map_nt_error_from_unix_common(errno);
287 0 : talloc_free(frame);
288 0 : return status;
289 : }
290 :
291 0 : status = nbt_name_register_bcast_recv(subreq);
292 0 : if (!NT_STATUS_IS_OK(status)) {
293 0 : talloc_free(frame);
294 0 : return status;
295 : }
296 :
297 0 : TALLOC_FREE(frame);
298 0 : return NT_STATUS_OK;
299 : }
300 :
301 :
302 : /*
303 : a wins name register with multiple WINS servers and multiple
304 : addresses to register. Try each WINS server in turn, until we get a
305 : reply for each address
306 : */
307 : struct nbt_name_register_wins_state {
308 : struct nbt_name_socket *nbtsock;
309 : struct nbt_name_register io;
310 : char **wins_servers;
311 : uint16_t wins_port;
312 : char **addresses;
313 : uint32_t address_idx;
314 : };
315 :
316 : static void nbt_name_register_wins_handler(struct nbt_name_request *subreq);
317 :
318 : /*
319 : the async send call for a multi-server WINS register
320 : */
321 418 : _PUBLIC_ struct tevent_req *nbt_name_register_wins_send(TALLOC_CTX *mem_ctx,
322 : struct tevent_context *ev,
323 : struct nbt_name_socket *nbtsock,
324 : struct nbt_name_register_wins *io)
325 : {
326 12 : struct tevent_req *req;
327 12 : struct nbt_name_register_wins_state *state;
328 12 : struct nbt_name_request *subreq;
329 :
330 418 : req = tevent_req_create(mem_ctx, &state,
331 : struct nbt_name_register_wins_state);
332 418 : if (req == NULL) {
333 0 : return NULL;
334 : }
335 :
336 418 : if (io->in.wins_servers == NULL) {
337 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
338 0 : return tevent_req_post(req, ev);
339 : }
340 :
341 418 : if (io->in.wins_servers[0] == NULL) {
342 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
343 0 : return tevent_req_post(req, ev);
344 : }
345 :
346 418 : if (io->in.addresses == NULL) {
347 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
348 0 : return tevent_req_post(req, ev);
349 : }
350 :
351 418 : if (io->in.addresses[0] == NULL) {
352 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
353 0 : return tevent_req_post(req, ev);
354 : }
355 :
356 418 : state->wins_port = io->in.wins_port;
357 418 : state->wins_servers = str_list_copy(state, io->in.wins_servers);
358 418 : if (tevent_req_nomem(state->wins_servers, req)) {
359 0 : return tevent_req_post(req, ev);
360 : }
361 :
362 418 : state->addresses = str_list_copy(state, io->in.addresses);
363 418 : if (tevent_req_nomem(state->addresses, req)) {
364 0 : return tevent_req_post(req, ev);
365 : }
366 :
367 418 : state->io.in.name = io->in.name;
368 418 : state->io.in.dest_addr = state->wins_servers[0];
369 418 : state->io.in.dest_port = state->wins_port;
370 418 : state->io.in.address = io->in.addresses[0];
371 418 : state->io.in.nb_flags = io->in.nb_flags;
372 418 : state->io.in.broadcast = false;
373 418 : state->io.in.register_demand = false;
374 418 : state->io.in.multi_homed = (io->in.nb_flags & NBT_NM_GROUP)?false:true;
375 418 : state->io.in.ttl = io->in.ttl;
376 418 : state->io.in.timeout = 3;
377 418 : state->io.in.retries = 2;
378 :
379 418 : state->nbtsock = nbtsock;
380 418 : state->address_idx = 0;
381 :
382 418 : subreq = nbt_name_register_send(nbtsock, &state->io);
383 418 : if (tevent_req_nomem(subreq, req)) {
384 0 : return tevent_req_post(req, ev);
385 : }
386 :
387 418 : subreq->async.fn = nbt_name_register_wins_handler;
388 418 : subreq->async.private_data = req;
389 :
390 418 : return req;
391 : }
392 :
393 : /*
394 : state handler for WINS multi-homed multi-server name register
395 : */
396 418 : static void nbt_name_register_wins_handler(struct nbt_name_request *subreq)
397 : {
398 12 : struct tevent_req *req =
399 418 : talloc_get_type_abort(subreq->async.private_data,
400 : struct tevent_req);
401 12 : struct nbt_name_register_wins_state *state =
402 418 : tevent_req_data(req,
403 : struct nbt_name_register_wins_state);
404 12 : NTSTATUS status;
405 :
406 418 : status = nbt_name_register_recv(subreq, state, &state->io);
407 418 : if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
408 : /* the register timed out - try the next WINS server */
409 0 : state->wins_servers++;
410 0 : if (state->wins_servers[0] == NULL) {
411 0 : tevent_req_nterror(req, status);
412 0 : return;
413 : }
414 :
415 0 : state->address_idx = 0;
416 0 : state->io.in.dest_addr = state->wins_servers[0];
417 0 : state->io.in.dest_port = state->wins_port;
418 0 : state->io.in.address = state->addresses[0];
419 :
420 0 : subreq = nbt_name_register_send(state->nbtsock, &state->io);
421 0 : if (tevent_req_nomem(subreq, req)) {
422 0 : return;
423 : }
424 :
425 0 : subreq->async.fn = nbt_name_register_wins_handler;
426 0 : subreq->async.private_data = req;
427 0 : return;
428 : }
429 :
430 418 : if (!NT_STATUS_IS_OK(status)) {
431 389 : tevent_req_nterror(req, status);
432 389 : return;
433 : }
434 :
435 29 : if (state->io.out.rcode == 0 &&
436 27 : state->addresses[state->address_idx+1] != NULL) {
437 : /* register our next address */
438 0 : state->io.in.address = state->addresses[++(state->address_idx)];
439 :
440 0 : subreq = nbt_name_register_send(state->nbtsock, &state->io);
441 0 : if (tevent_req_nomem(subreq, req)) {
442 0 : return;
443 : }
444 :
445 0 : subreq->async.fn = nbt_name_register_wins_handler;
446 0 : subreq->async.private_data = req;
447 0 : return;
448 : }
449 :
450 29 : tevent_req_done(req);
451 : }
452 :
453 : /*
454 : multi-homed WINS name register - recv side
455 : */
456 418 : _PUBLIC_ NTSTATUS nbt_name_register_wins_recv(struct tevent_req *req,
457 : TALLOC_CTX *mem_ctx,
458 : struct nbt_name_register_wins *io)
459 : {
460 12 : struct nbt_name_register_wins_state *state =
461 418 : tevent_req_data(req,
462 : struct nbt_name_register_wins_state);
463 12 : NTSTATUS status;
464 :
465 418 : if (tevent_req_is_nterror(req, &status)) {
466 389 : tevent_req_received(req);
467 389 : return status;
468 : }
469 :
470 29 : io->out.wins_server = talloc_move(mem_ctx, &state->wins_servers[0]);
471 29 : io->out.rcode = state->io.out.rcode;
472 :
473 29 : tevent_req_received(req);
474 29 : return NT_STATUS_OK;
475 : }
476 :
477 : /*
478 : multi-homed WINS register - sync interface
479 : */
480 29 : _PUBLIC_ NTSTATUS nbt_name_register_wins(struct nbt_name_socket *nbtsock,
481 : TALLOC_CTX *mem_ctx,
482 : struct nbt_name_register_wins *io)
483 : {
484 29 : TALLOC_CTX *frame = talloc_stackframe();
485 0 : struct tevent_context *ev;
486 0 : struct tevent_req *subreq;
487 0 : NTSTATUS status;
488 :
489 : /*
490 : * TODO: create a temporary event context
491 : */
492 29 : ev = nbtsock->event_ctx;
493 :
494 29 : subreq = nbt_name_register_wins_send(frame, ev, nbtsock, io);
495 29 : if (subreq == NULL) {
496 0 : talloc_free(frame);
497 0 : return NT_STATUS_NO_MEMORY;
498 : }
499 :
500 29 : if (!tevent_req_poll(subreq, ev)) {
501 0 : status = map_nt_error_from_unix_common(errno);
502 0 : talloc_free(frame);
503 0 : return status;
504 : }
505 :
506 29 : status = nbt_name_register_wins_recv(subreq, mem_ctx, io);
507 29 : if (!NT_STATUS_IS_OK(status)) {
508 0 : talloc_free(frame);
509 0 : return status;
510 : }
511 :
512 29 : TALLOC_FREE(frame);
513 29 : return NT_STATUS_OK;
514 : }
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