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
|
/*
Unix SMB/CIFS implementation.
general name resolution interface
Copyright (C) Andrew Tridgell 2005
Copyright (C) Jelmer Vernooij 2007
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 "lib/events/events.h"
#include "libcli/composite/composite.h"
#include "libcli/resolve/resolve.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"
#include "system/network.h"
#include "util/dlinklist.h"
struct resolve_state {
struct resolve_context *ctx;
struct resolve_method *method;
struct nbt_name name;
struct composite_context *creq;
const char *reply_addr;
};
static struct composite_context *setup_next_method(struct composite_context *c);
struct resolve_context {
struct resolve_method {
resolve_name_send_fn send_fn;
resolve_name_recv_fn recv_fn;
void *privdata;
struct resolve_method *prev, *next;
} *methods;
};
/**
* Initialize a resolve context
*/
struct resolve_context *resolve_context_init(TALLOC_CTX *mem_ctx)
{
return talloc_zero(mem_ctx, struct resolve_context);
}
/**
* Add a resolve method
*/
bool resolve_context_add_method(struct resolve_context *ctx, resolve_name_send_fn send_fn,
resolve_name_recv_fn recv_fn, void *userdata)
{
struct resolve_method *method = talloc_zero(ctx, struct resolve_method);
if (method == NULL)
return false;
method->send_fn = send_fn;
method->recv_fn = recv_fn;
method->privdata = userdata;
DLIST_ADD_END(ctx->methods, method, struct resolve_method *);
return true;
}
/**
handle completion of one name resolve method
*/
static void resolve_handler(struct composite_context *creq)
{
struct composite_context *c = (struct composite_context *)creq->async.private_data;
struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
const struct resolve_method *method = state->method;
c->status = method->recv_fn(creq, state, &state->reply_addr);
if (!NT_STATUS_IS_OK(c->status)) {
state->method = state->method->next;
state->creq = setup_next_method(c);
if (state->creq != NULL) {
return;
}
}
if (!NT_STATUS_IS_OK(c->status)) {
c->state = COMPOSITE_STATE_ERROR;
} else {
c->state = COMPOSITE_STATE_DONE;
}
if (c->async.fn) {
c->async.fn(c);
}
}
static struct composite_context *setup_next_method(struct composite_context *c)
{
struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
struct composite_context *creq = NULL;
do {
if (state->method) {
creq = state->method->send_fn(c, c->event_ctx, state->method->privdata, &state->name);
}
if (creq == NULL && state->method) state->method = state->method->next;
} while (!creq && state->method);
if (creq) {
creq->async.fn = resolve_handler;
creq->async.private_data = c;
}
return creq;
}
/*
general name resolution - async send
*/
struct composite_context *resolve_name_send(struct resolve_context *ctx,
struct nbt_name *name,
struct event_context *event_ctx)
{
struct composite_context *c;
struct resolve_state *state;
if (ctx == NULL || event_ctx == NULL) {
return NULL;
}
c = composite_create(ctx, event_ctx);
if (c == NULL) return NULL;
if (composite_nomem(c->event_ctx, c)) return c;
state = talloc(c, struct resolve_state);
if (composite_nomem(state, c)) return c;
c->private_data = state;
c->status = nbt_name_dup(state, name, &state->name);
if (!composite_is_ok(c)) return c;
state->ctx = talloc_reference(state, ctx);
if (composite_nomem(state->ctx, c)) return c;
if (is_ipaddress(state->name.name) ||
strcasecmp(state->name.name, "localhost") == 0) {
struct in_addr ip = interpret_addr2(state->name.name);
state->reply_addr = talloc_strdup(state, inet_ntoa(ip));
if (composite_nomem(state->reply_addr, c)) return c;
composite_done(c);
return c;
}
state->method = ctx->methods;
if (state->method == NULL) {
composite_error(c, NT_STATUS_HOST_UNREACHABLE);
return c;
}
state->creq = setup_next_method(c);
if (composite_nomem(state->creq, c)) return c;
return c;
}
/*
general name resolution method - recv side
*/
NTSTATUS resolve_name_recv(struct composite_context *c,
TALLOC_CTX *mem_ctx, const char **reply_addr)
{
NTSTATUS status;
status = composite_wait(c);
if (NT_STATUS_IS_OK(status)) {
struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
*reply_addr = talloc_steal(mem_ctx, state->reply_addr);
}
talloc_free(c);
return status;
}
/*
general name resolution - sync call
*/
NTSTATUS resolve_name(struct resolve_context *ctx, struct nbt_name *name, TALLOC_CTX *mem_ctx, const char **reply_addr, struct event_context *ev)
{
struct composite_context *c = resolve_name_send(ctx, name, ev);
return resolve_name_recv(c, mem_ctx, reply_addr);
}
/* Initialise a struct nbt_name with a NULL scope */
void make_nbt_name(struct nbt_name *nbt, const char *name, int type)
{
nbt->name = name;
nbt->scope = NULL;
nbt->type = type;
}
/* Initialise a struct nbt_name with a NBT_NAME_CLIENT (0x00) name */
void make_nbt_name_client(struct nbt_name *nbt, const char *name)
{
make_nbt_name(nbt, name, NBT_NAME_CLIENT);
}
/* Initialise a struct nbt_name with a NBT_NAME_SERVER (0x20) name */
void make_nbt_name_server(struct nbt_name *nbt, const char *name)
{
make_nbt_name(nbt, name, NBT_NAME_SERVER);
}
|
