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
|
/*
Unix SMB/CIFS implementation.
Copyright (C) Andrew Tridgell 2005
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
composite API helper functions
*/
#include "includes.h"
#include "lib/events/events.h"
#include "libcli/raw/libcliraw.h"
#include "libcli/smb2/smb2.h"
#include "libcli/composite/composite.h"
#include "lib/messaging/irpc.h"
#include "librpc/rpc/dcerpc.h"
#include "libcli/nbt/libnbt.h"
/*
create a new composite_context structure
and initialize it
*/
_PUBLIC_ struct composite_context *composite_create(TALLOC_CTX *mem_ctx,
struct event_context *ev)
{
struct composite_context *c;
c = talloc_zero(mem_ctx, struct composite_context);
if (!c) return NULL;
c->state = COMPOSITE_STATE_IN_PROGRESS;
c->event_ctx = ev;
return c;
}
/*
block until a composite function has completed, then return the status
*/
_PUBLIC_ NTSTATUS composite_wait(struct composite_context *c)
{
if (c == NULL) return NT_STATUS_NO_MEMORY;
c->used_wait = True;
while (c->state < COMPOSITE_STATE_DONE) {
if (event_loop_once(c->event_ctx) != 0) {
return NT_STATUS_UNSUCCESSFUL;
}
}
return c->status;
}
/*
* Some composite helpers that are handy if you write larger composite
* functions.
*/
_PUBLIC_ BOOL composite_is_ok(struct composite_context *ctx)
{
if (NT_STATUS_IS_OK(ctx->status)) {
return True;
}
ctx->state = COMPOSITE_STATE_ERROR;
if (ctx->async.fn != NULL) {
ctx->async.fn(ctx);
}
return False;
}
/*
callback from composite_done() and composite_error()
this is used to allow for a composite function to complete without
going through any state transitions. When that happens the caller
has had no opportunity to fill in the async callback fields
(ctx->async.fn and ctx->async.private) which means the usual way of
dealing with composite functions doesn't work. To cope with this,
we trigger a timer event that will happen then the event loop is
re-entered. This gives the caller a chance to setup the callback,
and allows the caller to ignore the fact that the composite
function completed early
*/
static void composite_trigger(struct event_context *ev, struct timed_event *te,
struct timeval t, void *ptr)
{
struct composite_context *c = talloc_get_type(ptr, struct composite_context);
if (c->async.fn) {
c->async.fn(c);
}
}
_PUBLIC_ void composite_error(struct composite_context *ctx, NTSTATUS status)
{
if (!ctx->used_wait && !ctx->async.fn) {
event_add_timed(ctx->event_ctx, ctx, timeval_zero(), composite_trigger, ctx);
}
ctx->status = status;
SMB_ASSERT(!composite_is_ok(ctx));
}
_PUBLIC_ BOOL composite_nomem(const void *p, struct composite_context *ctx)
{
if (p != NULL) {
return False;
}
composite_error(ctx, NT_STATUS_NO_MEMORY);
return True;
}
_PUBLIC_ void composite_done(struct composite_context *ctx)
{
if (!ctx->used_wait && !ctx->async.fn) {
event_add_timed(ctx->event_ctx, ctx, timeval_zero(), composite_trigger, ctx);
}
ctx->state = COMPOSITE_STATE_DONE;
if (ctx->async.fn != NULL) {
ctx->async.fn(ctx);
}
}
_PUBLIC_ void composite_continue(struct composite_context *ctx,
struct composite_context *new_ctx,
void (*continuation)(struct composite_context *),
void *private_data)
{
if (composite_nomem(new_ctx, ctx)) return;
new_ctx->async.fn = continuation;
new_ctx->async.private_data = private_data;
/* if we are setting up a continuation, and the context has
already finished, then we should run the callback with an
immediate event, otherwise we can be stuck forever */
if (new_ctx->state >= COMPOSITE_STATE_DONE && continuation) {
event_add_timed(new_ctx->event_ctx, new_ctx, timeval_zero(), composite_trigger, new_ctx);
}
}
_PUBLIC_ void composite_continue_rpc(struct composite_context *ctx,
struct rpc_request *new_req,
void (*continuation)(struct rpc_request *),
void *private_data)
{
if (composite_nomem(new_req, ctx)) return;
new_req->async.callback = continuation;
new_req->async.private_data = private_data;
}
_PUBLIC_ void composite_continue_irpc(struct composite_context *ctx,
struct irpc_request *new_req,
void (*continuation)(struct irpc_request *),
void *private_data)
{
if (composite_nomem(new_req, ctx)) return;
new_req->async.fn = continuation;
new_req->async.private = private_data;
}
_PUBLIC_ void composite_continue_smb(struct composite_context *ctx,
struct smbcli_request *new_req,
void (*continuation)(struct smbcli_request *),
void *private_data)
{
if (composite_nomem(new_req, ctx)) return;
new_req->async.fn = continuation;
new_req->async.private = private_data;
}
_PUBLIC_ void composite_continue_smb2(struct composite_context *ctx,
struct smb2_request *new_req,
void (*continuation)(struct smb2_request *),
void *private_data)
{
if (composite_nomem(new_req, ctx)) return;
new_req->async.fn = continuation;
new_req->async.private = private_data;
}
_PUBLIC_ void composite_continue_nbt(struct composite_context *ctx,
struct nbt_name_request *new_req,
void (*continuation)(struct nbt_name_request *),
void *private_data)
{
if (composite_nomem(new_req, ctx)) return;
new_req->async.fn = continuation;
new_req->async.private = private_data;
}
|
