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DEFINITIONS
This source file includes following definitions.
- nbtlist_handler
- resolve_name_nbtlist_send
- resolve_name_nbtlist_recv
1 /*
2 Unix SMB/CIFS implementation.
3
4 nbt list of addresses name resolution module
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 /*
23 TODO: we should lower the timeout, and add retries for each name
24 */
25
26 #include "includes.h"
27 #include "libcli/composite/composite.h"
28 #include "system/network.h"
29 #include "lib/socket/socket.h"
30 #include "lib/socket/netif.h"
31 #include "librpc/gen_ndr/ndr_nbt.h"
32 #include "../libcli/nbt/libnbt.h"
33 #include "param/param.h"
34 #include "libcli/resolve/resolve.h"
35
36 struct nbtlist_state {
37 uint16_t flags;
38 uint16_t port;
39 struct nbt_name name;
40 struct nbt_name_socket *nbtsock;
41 int num_queries;
42 struct nbt_name_request **queries;
43 struct nbt_name_query *io_queries;
44 struct socket_address **addrs;
45 char **names;
46 struct interface *ifaces;
47 };
48
49 /*
50 handle events during nbtlist name resolution
51 */
52 static void nbtlist_handler(struct nbt_name_request *req)
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53 {
54 struct composite_context *c = talloc_get_type(req->async.private_data,
55 struct composite_context);
56 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
57 struct nbt_name_query *q;
58 int i;
59
60 for (i=0;i<state->num_queries;i++) {
61 if (req == state->queries[i]) break;
62 }
63
64 if (i == state->num_queries) {
65 /* not for us?! */
66 composite_error(c, NT_STATUS_INTERNAL_ERROR);
67 return;
68 }
69
70 q = &state->io_queries[i];
71
72 c->status = nbt_name_query_recv(req, state, q);
73
74 /* free the network resource directly */
75 talloc_free(state->nbtsock);
76 if (!composite_is_ok(c)) return;
77
78 if (q->out.num_addrs < 1) {
79 composite_error(c, NT_STATUS_UNEXPECTED_NETWORK_ERROR);
80 return;
81 }
82
83 state->addrs = talloc_array(state, struct socket_address *,
84 q->out.num_addrs + 1);
85 if (composite_nomem(state->addrs, c)) return;
86
87 state->names = talloc_array(state, char *, q->out.num_addrs + 1);
88 if (composite_nomem(state->names, c)) return;
89
90 for (i=0;i<q->out.num_addrs;i++) {
91 state->addrs[i] = socket_address_from_strings(state->addrs,
92 "ipv4",
93 q->out.reply_addrs[i],
94 state->port);
95 if (composite_nomem(state->addrs[i], c)) return;
96
97 state->names[i] = talloc_strdup(state->names, state->name.name);
98 if (composite_nomem(state->names[i], c)) return;
99 }
100 state->addrs[i] = NULL;
101 state->names[i] = NULL;
102
103 composite_done(c);
104 }
105
106 /*
107 nbtlist name resolution method - async send
108 */
109 struct composite_context *resolve_name_nbtlist_send(TALLOC_CTX *mem_ctx,
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110 struct tevent_context *event_ctx,
111 uint32_t flags,
112 uint16_t port,
113 struct nbt_name *name,
114 const char **address_list,
115 struct interface *ifaces,
116 uint16_t nbt_port,
117 int nbt_timeout,
118 bool broadcast,
119 bool wins_lookup)
120 {
121 struct composite_context *c;
122 struct nbtlist_state *state;
123 int i;
124
125 c = composite_create(mem_ctx, event_ctx);
126 if (c == NULL) return NULL;
127
128 if (flags & RESOLVE_NAME_FLAG_FORCE_DNS) {
129 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
130 return c;
131 }
132
133 if (strlen(name->name) > 15) {
134 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
135 return c;
136 }
137
138 state = talloc(c, struct nbtlist_state);
139 if (composite_nomem(state, c)) return c;
140 c->private_data = state;
141
142 state->flags = flags;
143 state->port = port;
144
145 c->status = nbt_name_dup(state, name, &state->name);
146 if (!composite_is_ok(c)) return c;
147
148 state->name.name = strupper_talloc(state, state->name.name);
149 if (composite_nomem(state->name.name, c)) return c;
150 if (state->name.scope) {
151 state->name.scope = strupper_talloc(state, state->name.scope);
152 if (composite_nomem(state->name.scope, c)) return c;
153 }
154
155 state->ifaces = talloc_reference(state, ifaces);
156
157 /*
158 * we can't push long names on the wire,
159 * so bail out here to give a useful error message
160 */
161 if (strlen(state->name.name) > 15) {
162 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND);
163 return c;
164 }
165
166 state->nbtsock = nbt_name_socket_init(state, event_ctx,
167 global_iconv_convenience);
168 if (composite_nomem(state->nbtsock, c)) return c;
169
170 /* count the address_list size */
171 for (i=0;address_list[i];i++) /* noop */ ;
172
173 state->num_queries = i;
174 state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries);
175 if (composite_nomem(state->io_queries, c)) return c;
176
177 state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries);
178 if (composite_nomem(state->queries, c)) return c;
179
180 for (i=0;i<state->num_queries;i++) {
181 state->io_queries[i].in.name = state->name;
182 state->io_queries[i].in.dest_addr = talloc_strdup(state->io_queries, address_list[i]);
183 state->io_queries[i].in.dest_port = nbt_port;
184 if (composite_nomem(state->io_queries[i].in.dest_addr, c)) return c;
185
186 state->io_queries[i].in.broadcast = broadcast;
187 state->io_queries[i].in.wins_lookup = wins_lookup;
188 state->io_queries[i].in.timeout = nbt_timeout;
189 state->io_queries[i].in.retries = 2;
190
191 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]);
192 if (composite_nomem(state->queries[i], c)) return c;
193
194 state->queries[i]->async.fn = nbtlist_handler;
195 state->queries[i]->async.private_data = c;
196 }
197
198 return c;
199 }
200
201 /*
202 nbt list of addresses name resolution method - recv side
203 */
204 NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c,
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205 TALLOC_CTX *mem_ctx,
206 struct socket_address ***addrs,
207 char ***names)
208 {
209 NTSTATUS status;
210
211 status = composite_wait(c);
212
213 if (NT_STATUS_IS_OK(status)) {
214 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state);
215 *addrs = talloc_steal(mem_ctx, state->addrs);
216 if (names) {
217 *names = talloc_steal(mem_ctx, state->names);
218 }
219 }
220
221 talloc_free(c);
222 return status;
223 }
224