Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 :
4 : send out a name refresh 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 "lib/util/tevent_ntstatus.h"
28 :
29 : /*
30 : send a nbt name refresh request
31 : */
32 31 : struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock,
33 : struct nbt_name_refresh *io)
34 : {
35 : struct nbt_name_request *req;
36 : struct nbt_name_packet *packet;
37 : struct socket_address *dest;
38 :
39 31 : packet = talloc_zero(nbtsock, struct nbt_name_packet);
40 31 : if (packet == NULL) return NULL;
41 :
42 31 : packet->qdcount = 1;
43 31 : packet->arcount = 1;
44 31 : packet->operation = NBT_OPCODE_REFRESH;
45 31 : if (io->in.broadcast) {
46 0 : packet->operation |= NBT_FLAG_BROADCAST;
47 : }
48 :
49 31 : packet->questions = talloc_array(packet, struct nbt_name_question, 1);
50 31 : if (packet->questions == NULL) goto failed;
51 :
52 31 : packet->questions[0].name = io->in.name;
53 31 : packet->questions[0].question_type = NBT_QTYPE_NETBIOS;
54 31 : packet->questions[0].question_class = NBT_QCLASS_IP;
55 :
56 31 : packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
57 31 : if (packet->additional == NULL) goto failed;
58 :
59 31 : packet->additional[0].name = io->in.name;
60 31 : packet->additional[0].rr_type = NBT_QTYPE_NETBIOS;
61 31 : packet->additional[0].rr_class = NBT_QCLASS_IP;
62 31 : packet->additional[0].ttl = io->in.ttl;
63 31 : packet->additional[0].rdata.netbios.length = 6;
64 31 : packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
65 : struct nbt_rdata_address, 1);
66 31 : if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
67 31 : packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
68 62 : packet->additional[0].rdata.netbios.addresses[0].ipaddr =
69 62 : talloc_strdup(packet->additional, io->in.address);
70 :
71 62 : dest = socket_address_from_strings(nbtsock,
72 31 : nbtsock->sock->backend_name,
73 31 : io->in.dest_addr, io->in.dest_port);
74 31 : if (dest == NULL) goto failed;
75 31 : req = nbt_name_request_send(nbtsock, nbtsock, dest, packet,
76 : io->in.timeout, io->in.retries, false);
77 31 : if (req == NULL) goto failed;
78 :
79 31 : talloc_free(packet);
80 31 : return req;
81 :
82 0 : failed:
83 0 : talloc_free(packet);
84 0 : return NULL;
85 : }
86 :
87 : /*
88 : wait for a refresh reply
89 : */
90 31 : _PUBLIC_ NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req,
91 : TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
92 : {
93 : NTSTATUS status;
94 : struct nbt_name_packet *packet;
95 :
96 31 : status = nbt_name_request_recv(req);
97 62 : if (!NT_STATUS_IS_OK(status) ||
98 31 : req->num_replies == 0) {
99 0 : talloc_free(req);
100 0 : return status;
101 : }
102 :
103 31 : packet = req->replies[0].packet;
104 31 : io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
105 :
106 62 : if (packet->ancount != 1 ||
107 62 : packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
108 31 : packet->answers[0].rr_class != NBT_QCLASS_IP) {
109 0 : talloc_free(req);
110 0 : return NT_STATUS_INVALID_NETWORK_RESPONSE;
111 : }
112 :
113 31 : io->out.rcode = packet->operation & NBT_RCODE;
114 31 : io->out.name = packet->answers[0].name;
115 31 : if (packet->answers[0].rdata.netbios.length < 6) {
116 0 : talloc_free(req);
117 0 : return NT_STATUS_INVALID_NETWORK_RESPONSE;
118 : }
119 31 : io->out.reply_addr = talloc_steal(mem_ctx,
120 : packet->answers[0].rdata.netbios.addresses[0].ipaddr);
121 31 : talloc_steal(mem_ctx, io->out.name.name);
122 31 : talloc_steal(mem_ctx, io->out.name.scope);
123 :
124 31 : talloc_free(req);
125 :
126 31 : return NT_STATUS_OK;
127 : }
128 :
129 : /*
130 : synchronous name refresh request
131 : */
132 1 : _PUBLIC_ NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock,
133 : TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
134 : {
135 1 : struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
136 1 : return nbt_name_refresh_recv(req, mem_ctx, io);
137 : }
138 :
139 :
140 :
141 : /**
142 : a wins name refresh with multiple WINS servers and multiple
143 : addresses to refresh. Try each WINS server in turn, until we get a
144 : reply for each address
145 : */
146 : struct nbt_name_refresh_wins_state {
147 : struct nbt_name_socket *nbtsock;
148 : struct nbt_name_refresh *io;
149 : char **wins_servers;
150 : uint16_t wins_port;
151 : char **addresses;
152 : int address_idx;
153 : };
154 :
155 : static void nbt_name_refresh_wins_handler(struct nbt_name_request *subreq);
156 :
157 : /**
158 : the async send call for a multi-server WINS refresh
159 : */
160 30 : _PUBLIC_ struct tevent_req *nbt_name_refresh_wins_send(TALLOC_CTX *mem_ctx,
161 : struct tevent_context *ev,
162 : struct nbt_name_socket *nbtsock,
163 : struct nbt_name_refresh_wins *io)
164 : {
165 : struct tevent_req *req;
166 : struct nbt_name_refresh_wins_state *state;
167 : struct nbt_name_request *subreq;
168 :
169 30 : req = tevent_req_create(mem_ctx, &state,
170 : struct nbt_name_refresh_wins_state);
171 30 : if (req == NULL) {
172 0 : return NULL;
173 : }
174 :
175 30 : state->io = talloc(state, struct nbt_name_refresh);
176 30 : if (tevent_req_nomem(state->io, req)) {
177 0 : return tevent_req_post(req, ev);
178 : }
179 :
180 30 : if (io->in.wins_servers == NULL) {
181 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
182 0 : return tevent_req_post(req, ev);
183 : }
184 :
185 30 : if (io->in.wins_servers[0] == NULL) {
186 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
187 0 : return tevent_req_post(req, ev);
188 : }
189 :
190 30 : if (io->in.addresses == NULL) {
191 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
192 0 : return tevent_req_post(req, ev);
193 : }
194 :
195 30 : if (io->in.addresses[0] == NULL) {
196 0 : tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
197 0 : return tevent_req_post(req, ev);
198 : }
199 :
200 30 : state->wins_port = io->in.wins_port;
201 30 : state->wins_servers = str_list_copy(state, io->in.wins_servers);
202 30 : if (tevent_req_nomem(state->wins_servers, req)) {
203 0 : return tevent_req_post(req, ev);
204 : }
205 :
206 30 : state->addresses = str_list_copy(state, io->in.addresses);
207 30 : if (tevent_req_nomem(state->addresses, req)) {
208 0 : return tevent_req_post(req, ev);
209 : }
210 :
211 30 : state->io->in.name = io->in.name;
212 30 : state->io->in.dest_addr = state->wins_servers[0];
213 30 : state->io->in.dest_port = state->wins_port;
214 30 : state->io->in.address = io->in.addresses[0];
215 30 : state->io->in.nb_flags = io->in.nb_flags;
216 30 : state->io->in.broadcast = false;
217 30 : state->io->in.ttl = io->in.ttl;
218 30 : state->io->in.timeout = 2;
219 30 : state->io->in.retries = 2;
220 :
221 30 : state->nbtsock = nbtsock;
222 30 : state->address_idx = 0;
223 :
224 30 : subreq = nbt_name_refresh_send(nbtsock, state->io);
225 30 : if (tevent_req_nomem(subreq, req)) {
226 0 : return tevent_req_post(req, ev);
227 : }
228 :
229 30 : subreq->async.fn = nbt_name_refresh_wins_handler;
230 30 : subreq->async.private_data = req;
231 :
232 30 : return req;
233 : }
234 :
235 30 : static void nbt_name_refresh_wins_handler(struct nbt_name_request *subreq)
236 : {
237 30 : struct tevent_req *req =
238 30 : talloc_get_type_abort(subreq->async.private_data,
239 : struct tevent_req);
240 30 : struct nbt_name_refresh_wins_state *state =
241 30 : tevent_req_data(req,
242 : struct nbt_name_refresh_wins_state);
243 : NTSTATUS status;
244 :
245 30 : status = nbt_name_refresh_recv(subreq, state, state->io);
246 30 : if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
247 : /* the refresh timed out - try the next WINS server */
248 0 : state->wins_servers++;
249 0 : if (state->wins_servers[0] == NULL) {
250 0 : tevent_req_nterror(req, status);
251 0 : return;
252 : }
253 :
254 0 : state->address_idx = 0;
255 0 : state->io->in.dest_addr = state->wins_servers[0];
256 0 : state->io->in.dest_port = state->wins_port;
257 0 : state->io->in.address = state->addresses[0];
258 :
259 0 : subreq = nbt_name_refresh_send(state->nbtsock, state->io);
260 0 : if (tevent_req_nomem(subreq, req)) {
261 0 : return;
262 : }
263 0 : subreq->async.fn = nbt_name_refresh_wins_handler;
264 0 : subreq->async.private_data = req;
265 30 : } else if (!NT_STATUS_IS_OK(status)) {
266 0 : tevent_req_nterror(req, status);
267 0 : return;
268 : }
269 :
270 60 : if (state->io->out.rcode == 0 &&
271 30 : state->addresses[state->address_idx+1] != NULL) {
272 : /* refresh our next address */
273 0 : state->io->in.address = state->addresses[++(state->address_idx)];
274 0 : subreq = nbt_name_refresh_send(state->nbtsock, state->io);
275 0 : if (tevent_req_nomem(subreq, req)) {
276 0 : return;
277 : }
278 0 : subreq->async.fn = nbt_name_refresh_wins_handler;
279 0 : subreq->async.private_data = req;
280 0 : return;
281 : }
282 :
283 30 : tevent_req_done(req);
284 : }
285 :
286 : /*
287 : multi-homed WINS name refresh - recv side
288 : */
289 30 : _PUBLIC_ NTSTATUS nbt_name_refresh_wins_recv(struct tevent_req *req,
290 : TALLOC_CTX *mem_ctx,
291 : struct nbt_name_refresh_wins *io)
292 : {
293 30 : struct nbt_name_refresh_wins_state *state =
294 30 : tevent_req_data(req,
295 : struct nbt_name_refresh_wins_state);
296 : NTSTATUS status;
297 :
298 30 : if (tevent_req_is_nterror(req, &status)) {
299 0 : tevent_req_received(req);
300 0 : return status;
301 : }
302 :
303 30 : io->out.wins_server = talloc_move(mem_ctx, &state->wins_servers[0]);
304 30 : io->out.rcode = state->io->out.rcode;
305 :
306 30 : tevent_req_received(req);
307 30 : return NT_STATUS_OK;
308 : }
309 :
310 : /*
311 : multi-homed WINS refresh - sync interface
312 : */
313 30 : _PUBLIC_ NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
314 : TALLOC_CTX *mem_ctx,
315 : struct nbt_name_refresh_wins *io)
316 : {
317 30 : TALLOC_CTX *frame = talloc_stackframe();
318 : struct tevent_context *ev;
319 : struct tevent_req *subreq;
320 : NTSTATUS status;
321 :
322 : /*
323 : * TODO: create a temporary event context
324 : */
325 30 : ev = nbtsock->event_ctx;
326 :
327 30 : subreq = nbt_name_refresh_wins_send(frame, ev, nbtsock, io);
328 30 : if (subreq == NULL) {
329 0 : talloc_free(frame);
330 0 : return NT_STATUS_NO_MEMORY;
331 : }
332 :
333 30 : if (!tevent_req_poll(subreq, ev)) {
334 0 : status = map_nt_error_from_unix_common(errno);
335 0 : talloc_free(frame);
336 0 : return status;
337 : }
338 :
339 30 : status = nbt_name_refresh_wins_recv(subreq, mem_ctx, io);
340 30 : if (!NT_STATUS_IS_OK(status)) {
341 0 : talloc_free(frame);
342 0 : return status;
343 : }
344 :
345 30 : TALLOC_FREE(frame);
346 30 : return NT_STATUS_OK;
347 : }
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