Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 :
4 : general name resolution interface
5 :
6 : Copyright (C) Andrew Tridgell 2005
7 : Copyright (C) Jelmer Vernooij 2007
8 :
9 : This program is free software; you can redistribute it and/or modify
10 : it under the terms of the GNU General Public License as published by
11 : the Free Software Foundation; either version 3 of the License, or
12 : (at your option) any later version.
13 :
14 : This program is distributed in the hope that it will be useful,
15 : but WITHOUT ANY WARRANTY; without even the implied warranty of
16 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 : GNU General Public License for more details.
18 :
19 : You should have received a copy of the GNU General Public License
20 : along with this program. If not, see <http://www.gnu.org/licenses/>.
21 : */
22 :
23 : #include "includes.h"
24 : #include "libcli/composite/composite.h"
25 : #include "libcli/resolve/resolve.h"
26 : #include "librpc/gen_ndr/ndr_nbt.h"
27 : #include "system/network.h"
28 : #include "lib/socket/socket.h"
29 : #include "../lib/util/dlinklist.h"
30 : #include "lib/tsocket/tsocket.h"
31 : #include "lib/util/util_net.h"
32 :
33 : #undef strcasecmp
34 :
35 : struct resolve_state {
36 : struct resolve_context *ctx;
37 : struct resolve_method *method;
38 : uint32_t flags;
39 : uint16_t port;
40 : struct nbt_name name;
41 : struct composite_context *creq;
42 : struct socket_address **addrs;
43 : char **names;
44 : };
45 :
46 : static struct composite_context *setup_next_method(struct composite_context *c);
47 :
48 :
49 : struct resolve_context {
50 : struct resolve_method {
51 : resolve_name_send_fn send_fn;
52 : resolve_name_recv_fn recv_fn;
53 : void *privdata;
54 : struct resolve_method *prev, *next;
55 : } *methods;
56 : };
57 :
58 : /**
59 : * Initialize a resolve context
60 : */
61 67913 : struct resolve_context *resolve_context_init(TALLOC_CTX *mem_ctx)
62 : {
63 67913 : return talloc_zero(mem_ctx, struct resolve_context);
64 : }
65 :
66 : /**
67 : * Add a resolve method
68 : */
69 270608 : bool resolve_context_add_method(struct resolve_context *ctx, resolve_name_send_fn send_fn,
70 : resolve_name_recv_fn recv_fn, void *userdata)
71 : {
72 270608 : struct resolve_method *method = talloc_zero(ctx, struct resolve_method);
73 :
74 270608 : if (method == NULL)
75 0 : return false;
76 :
77 270608 : method->send_fn = send_fn;
78 270608 : method->recv_fn = recv_fn;
79 270608 : method->privdata = userdata;
80 270608 : DLIST_ADD_END(ctx->methods, method);
81 265240 : return true;
82 : }
83 :
84 : /**
85 : handle completion of one name resolve method
86 : */
87 131328 : static void resolve_handler(struct composite_context *creq)
88 : {
89 131328 : struct composite_context *c = (struct composite_context *)creq->async.private_data;
90 131328 : struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
91 131328 : const struct resolve_method *method = state->method;
92 :
93 131328 : c->status = method->recv_fn(creq, state, &state->addrs, &state->names);
94 :
95 131328 : if (!NT_STATUS_IS_OK(c->status)) {
96 81983 : state->method = state->method->next;
97 81983 : state->creq = setup_next_method(c);
98 81983 : if (state->creq != NULL) {
99 75722 : return;
100 : }
101 : }
102 :
103 54342 : if (!NT_STATUS_IS_OK(c->status)) {
104 4997 : c->state = COMPOSITE_STATE_ERROR;
105 : } else {
106 49345 : c->state = COMPOSITE_STATE_DONE;
107 : }
108 54342 : if (c->async.fn) {
109 53925 : c->async.fn(c);
110 : }
111 : }
112 :
113 :
114 136325 : static struct composite_context *setup_next_method(struct composite_context *c)
115 : {
116 136325 : struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
117 136325 : struct composite_context *creq = NULL;
118 :
119 3786 : do {
120 173001 : if (state->method) {
121 168004 : creq = state->method->send_fn(c, c->event_ctx,
122 164218 : state->method->privdata,
123 : state->flags,
124 168004 : state->port,
125 : &state->name);
126 : }
127 173001 : if (creq == NULL && state->method) state->method = state->method->next;
128 :
129 173001 : } while (!creq && state->method);
130 :
131 136325 : if (creq) {
132 131328 : creq->async.fn = resolve_handler;
133 131328 : creq->async.private_data = c;
134 : }
135 :
136 136325 : return creq;
137 : }
138 :
139 : /*
140 : general name resolution - async send
141 : */
142 62398 : struct composite_context *resolve_name_all_send(struct resolve_context *ctx,
143 : TALLOC_CTX *mem_ctx,
144 : uint32_t flags, /* RESOLVE_NAME_FLAG_* */
145 : uint16_t port,
146 : struct nbt_name *name,
147 : struct tevent_context *event_ctx)
148 : {
149 1262 : struct composite_context *c;
150 1262 : struct resolve_state *state;
151 :
152 62398 : if (event_ctx == NULL) {
153 0 : return NULL;
154 : }
155 :
156 62398 : c = composite_create(mem_ctx, event_ctx);
157 62398 : if (c == NULL) return NULL;
158 :
159 62398 : if (composite_nomem(c->event_ctx, c)) return c;
160 :
161 62398 : state = talloc(c, struct resolve_state);
162 62398 : if (composite_nomem(state, c)) return c;
163 62398 : c->private_data = state;
164 :
165 62398 : state->flags = flags;
166 62398 : state->port = port;
167 :
168 62398 : c->status = nbt_name_dup(state, name, &state->name);
169 62398 : if (!composite_is_ok(c)) return c;
170 :
171 62398 : state->ctx = talloc_reference(state, ctx);
172 62398 : if (composite_nomem(state->ctx, c)) return c;
173 :
174 62398 : if (is_ipaddress(state->name.name) ||
175 54342 : strcasecmp(state->name.name, "localhost") == 0) {
176 8056 : state->addrs = talloc_array(state, struct socket_address *, 2);
177 8056 : if (composite_nomem(state->addrs, c)) return c;
178 8056 : state->addrs[0] = socket_address_from_strings(state->addrs, "ip",
179 : state->name.name, 0);
180 8056 : if (composite_nomem(state->addrs[0], c)) return c;
181 8056 : state->addrs[1] = NULL;
182 8056 : state->names = talloc_array(state, char *, 2);
183 8056 : if (composite_nomem(state->names, c)) return c;
184 8056 : state->names[0] = talloc_strdup(state->names, state->name.name);
185 8056 : if (composite_nomem(state->names[0], c)) return c;
186 8056 : state->names[1] = NULL;
187 8056 : composite_done(c);
188 8056 : return c;
189 : }
190 :
191 54342 : state->method = ctx->methods;
192 54342 : if (state->method == NULL) {
193 0 : composite_error(c, NT_STATUS_BAD_NETWORK_NAME);
194 0 : return c;
195 : }
196 54342 : state->creq = setup_next_method(c);
197 54342 : if (composite_nomem(state->creq, c)) return c;
198 :
199 53080 : return c;
200 : }
201 :
202 : /*
203 : general name resolution method - recv side
204 : */
205 62398 : NTSTATUS resolve_name_all_recv(struct composite_context *c,
206 : TALLOC_CTX *mem_ctx,
207 : struct socket_address ***addrs,
208 : char ***names)
209 : {
210 1262 : NTSTATUS status;
211 :
212 62398 : status = composite_wait(c);
213 :
214 62398 : if (NT_STATUS_IS_OK(status)) {
215 57401 : struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
216 57401 : *addrs = talloc_steal(mem_ctx, state->addrs);
217 57401 : if (names) {
218 0 : *names = talloc_steal(mem_ctx, state->names);
219 : }
220 : }
221 :
222 62398 : talloc_free(c);
223 62398 : return status;
224 : }
225 :
226 20037 : struct composite_context *resolve_name_ex_send(struct resolve_context *ctx,
227 : TALLOC_CTX *mem_ctx,
228 : uint32_t flags, /* RESOLVE_NAME_FLAG_* */
229 : uint16_t port,
230 : struct nbt_name *name,
231 : struct tevent_context *event_ctx)
232 : {
233 20037 : return resolve_name_all_send(ctx, mem_ctx, flags, port, name, event_ctx);
234 : }
235 :
236 16347 : struct composite_context *resolve_name_send(struct resolve_context *ctx,
237 : TALLOC_CTX *mem_ctx,
238 : struct nbt_name *name,
239 : struct tevent_context *event_ctx)
240 : {
241 16347 : return resolve_name_ex_send(ctx, mem_ctx, 0, 0, name, event_ctx);
242 : }
243 :
244 3474 : NTSTATUS resolve_name_recv(struct composite_context *c,
245 : TALLOC_CTX *mem_ctx,
246 : const char **reply_addr)
247 : {
248 36 : NTSTATUS status;
249 3474 : struct socket_address **addrs = NULL;
250 :
251 3474 : status = resolve_name_all_recv(c, mem_ctx, &addrs, NULL);
252 :
253 3474 : if (NT_STATUS_IS_OK(status)) {
254 3462 : struct tsocket_address *t_addr = socket_address_to_tsocket_address(addrs, addrs[0]);
255 3462 : if (!t_addr) {
256 0 : return NT_STATUS_NO_MEMORY;
257 : }
258 :
259 3462 : *reply_addr = tsocket_address_inet_addr_string(t_addr, mem_ctx);
260 3462 : talloc_free(addrs);
261 3462 : if (!*reply_addr) {
262 0 : return NT_STATUS_NO_MEMORY;
263 : }
264 : }
265 :
266 3474 : return status;
267 : }
268 :
269 : /*
270 : receive multiple responses from resolve_name_send()
271 : */
272 16563 : NTSTATUS resolve_name_multiple_recv(struct composite_context *c,
273 : TALLOC_CTX *mem_ctx,
274 : const char ***reply_addrs)
275 : {
276 242 : NTSTATUS status;
277 16563 : struct socket_address **addrs = NULL;
278 242 : int i;
279 :
280 16563 : status = resolve_name_all_recv(c, mem_ctx, &addrs, NULL);
281 16563 : NT_STATUS_NOT_OK_RETURN(status);
282 :
283 : /* count the addresses */
284 32807 : for (i=0; addrs[i]; i++) ;
285 :
286 11579 : *reply_addrs = talloc_array(mem_ctx, const char *, i+1);
287 11579 : NT_STATUS_HAVE_NO_MEMORY(*reply_addrs);
288 :
289 32807 : for (i=0; addrs[i]; i++) {
290 21228 : struct tsocket_address *t_addr = socket_address_to_tsocket_address(addrs, addrs[i]);
291 21228 : NT_STATUS_HAVE_NO_MEMORY(t_addr);
292 :
293 21228 : (*reply_addrs)[i] = tsocket_address_inet_addr_string(t_addr, *reply_addrs);
294 21228 : NT_STATUS_HAVE_NO_MEMORY((*reply_addrs)[i]);
295 : }
296 11579 : (*reply_addrs)[i] = NULL;
297 :
298 11579 : talloc_free(addrs);
299 :
300 11579 : return status;
301 : }
302 :
303 : /*
304 : general name resolution - sync call
305 : */
306 419 : NTSTATUS resolve_name_ex(struct resolve_context *ctx,
307 : uint32_t flags, /* RESOLVE_NAME_FLAG_* */
308 : uint16_t port,
309 : struct nbt_name *name,
310 : TALLOC_CTX *mem_ctx,
311 : const char **reply_addr,
312 : struct tevent_context *ev)
313 : {
314 419 : struct composite_context *c = resolve_name_ex_send(ctx, mem_ctx, flags, port, name, ev);
315 419 : return resolve_name_recv(c, mem_ctx, reply_addr);
316 : }
317 :
318 :
319 : /* Initialise a struct nbt_name with a NULL scope */
320 :
321 84463 : void make_nbt_name(struct nbt_name *nbt, const char *name, int type)
322 : {
323 84463 : nbt->name = name;
324 84463 : nbt->scope = NULL;
325 84463 : nbt->type = type;
326 84463 : }
327 :
328 : /* Initialise a struct nbt_name with a NBT_NAME_CLIENT (0x00) name */
329 :
330 22333 : void make_nbt_name_client(struct nbt_name *nbt, const char *name)
331 : {
332 22333 : make_nbt_name(nbt, name, NBT_NAME_CLIENT);
333 22333 : }
334 :
335 : /* Initialise a struct nbt_name with a NBT_NAME_SERVER (0x20) name */
336 :
337 58411 : void make_nbt_name_server(struct nbt_name *nbt, const char *name)
338 : {
339 58411 : make_nbt_name(nbt, name, NBT_NAME_SERVER);
340 58411 : }
341 :
342 :
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