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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
/*
Unix SMB/CIFS implementation.
routines for marshalling/unmarshalling basic types
Copyright (C) Andrew Tridgell 2003
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.
*/
#include "includes.h"
#define NDR_PULL_NEED_BYTES(ndr, n) do { \
if ((n) > ndr->data_size || ndr->offset + (n) > ndr->data_size) { \
return NT_STATUS_BUFFER_TOO_SMALL; \
} \
} while(0)
#define NDR_PULL_ALIGN(ndr, n) do { \
ndr->offset = (ndr->offset + (n-1)) & ~(n-1); \
if (ndr->offset >= ndr->data_size) { \
return NT_STATUS_BUFFER_TOO_SMALL; \
} \
} while(0)
/*
parse a u8
*/
NTSTATUS ndr_pull_u8(struct ndr_pull *ndr, uint8 *v)
{
NDR_PULL_NEED_BYTES(ndr, 1);
*v = CVAL(ndr->data, ndr->offset);
ndr->offset += 1;
return NT_STATUS_OK;
}
/*
parse a u16
*/
NTSTATUS ndr_pull_u16(struct ndr_pull *ndr, uint16 *v)
{
NDR_PULL_ALIGN(ndr, 2);
NDR_PULL_NEED_BYTES(ndr, 2);
if (ndr->flags & LIBNDR_FLAG_BIGENDIAN) {
*v = RSVAL(ndr->data, ndr->offset);
} else {
*v = SVAL(ndr->data, ndr->offset);
}
ndr->offset += 2;
return NT_STATUS_OK;
}
/*
parse a u32
*/
NTSTATUS ndr_pull_u32(struct ndr_pull *ndr, uint32 *v)
{
NDR_PULL_ALIGN(ndr, 4);
NDR_PULL_NEED_BYTES(ndr, 4);
if (ndr->flags & LIBNDR_FLAG_BIGENDIAN) {
*v = RIVAL(ndr->data, ndr->offset);
} else {
*v = IVAL(ndr->data, ndr->offset);
}
ndr->offset += 4;
return NT_STATUS_OK;
}
/*
pull a NTSTATUS
*/
NTSTATUS ndr_pull_status(struct ndr_pull *ndr, NTSTATUS *status)
{
uint32 v;
NDR_CHECK(ndr_pull_u32(ndr, &v));
*status = NT_STATUS(v);
return NT_STATUS_OK;
}
/*
parse a set of bytes
*/
NTSTATUS ndr_pull_bytes(struct ndr_pull *ndr, char *data, uint32 n)
{
NDR_PULL_NEED_BYTES(ndr, n);
memcpy(data, ndr->data + ndr->offset, n);
ndr->offset += n;
return NT_STATUS_OK;
}
/*
parse a GUID
*/
NTSTATUS ndr_pull_guid(struct ndr_pull *ndr, GUID *guid)
{
int i;
NDR_PULL_NEED_BYTES(ndr, GUID_SIZE);
for (i=0;i<GUID_SIZE;i++) {
guid->info[i] = CVAL(ndr->data, ndr->offset + i);
}
ndr->offset += i;
return NT_STATUS_OK;
}
#define NDR_PUSH_NEED_BYTES(ndr, n) NDR_CHECK(ndr_push_expand(ndr, ndr->offset+(n)))
#define NDR_PUSH_ALIGN(ndr, n) do { \
uint32 _pad = (ndr->offset & (n-1)); \
while (_pad--) NDR_CHECK(ndr_push_u8(ndr, 0)); \
} while(0)
/*
push a u8
*/
NTSTATUS ndr_push_u8(struct ndr_push *ndr, uint8 v)
{
NDR_PUSH_NEED_BYTES(ndr, 1);
SCVAL(ndr->data, ndr->offset, v);
ndr->offset += 1;
return NT_STATUS_OK;
}
/*
push a u16
*/
NTSTATUS ndr_push_u16(struct ndr_push *ndr, uint16 v)
{
NDR_PUSH_ALIGN(ndr, 2);
NDR_PUSH_NEED_BYTES(ndr, 2);
SSVAL(ndr->data, ndr->offset, v);
ndr->offset += 2;
return NT_STATUS_OK;
}
/*
push a u32
*/
NTSTATUS ndr_push_u32(struct ndr_push *ndr, uint32 v)
{
NDR_PUSH_ALIGN(ndr, 4);
NDR_PUSH_NEED_BYTES(ndr, 4);
SIVAL(ndr->data, ndr->offset, v);
ndr->offset += 4;
return NT_STATUS_OK;
}
/*
push some bytes
*/
NTSTATUS ndr_push_bytes(struct ndr_push *ndr, const char *data, uint32 n)
{
NDR_PUSH_NEED_BYTES(ndr, n);
memcpy(ndr->data + ndr->offset, data, n);
ndr->offset += n;
return NT_STATUS_OK;
}
/*
save the current position
*/
void ndr_push_save(struct ndr_push *ndr, struct ndr_push_save *save)
{
save->offset = ndr->offset;
}
/*
restore the position
*/
void ndr_push_restore(struct ndr_push *ndr, struct ndr_push_save *save)
{
ndr->offset = save->offset;
}
/*
this is used when a packet has a 4 byte length field. We remember the start position
and come back to it later to fill in the size
*/
NTSTATUS ndr_push_length4_start(struct ndr_push *ndr, struct ndr_push_save *save)
{
NDR_PUSH_ALIGN(ndr, 4);
ndr_push_save(ndr, save);
return ndr_push_u32(ndr, 0);
}
NTSTATUS ndr_push_length4_end(struct ndr_push *ndr, struct ndr_push_save *save)
{
struct ndr_push_save save2;
ndr_push_save(ndr, &save2);
ndr_push_restore(ndr, save);
NDR_CHECK(ndr_push_u32(ndr, save2.offset - ndr->offset));
ndr_push_restore(ndr, &save2);
return NT_STATUS_OK;
}
/*
push a 1 if a pointer is non-NULL, otherwise 0
*/
NTSTATUS ndr_push_ptr(struct ndr_push *ndr, const void *p)
{
return ndr_push_u32(ndr, p?1:0);
}
/*
push a comformant, variable ucs2 string onto the wire from a C string
*/
NTSTATUS ndr_push_unistr(struct ndr_push *ndr, const char *s)
{
char *ws;
ssize_t len;
len = push_ucs2_talloc(ndr->mem_ctx, (smb_ucs2_t **)&ws, s);
if (len == -1) {
return NT_STATUS_INVALID_PARAMETER;
}
NDR_CHECK(ndr_push_u32(ndr, len/2));
NDR_CHECK(ndr_push_u32(ndr, 0));
NDR_CHECK(ndr_push_u32(ndr, len/2));
NDR_CHECK(ndr_push_bytes(ndr, ws, len));
return NT_STATUS_OK;
}
/*
push a 4 byte offset pointer, remembering where we are so we can later fill
in the correct value
*/
NTSTATUS ndr_push_offset(struct ndr_push *ndr, struct ndr_push_save *ofs)
{
NDR_PUSH_ALIGN(ndr, 4);
ndr_push_save(ndr, ofs);
return ndr_push_u32(ndr, 0);
}
/*
fill in the correct offset in a saved offset pointer
the offset is taken relative to 'save'
*/
NTSTATUS ndr_push_offset_ptr(struct ndr_push *ndr,
struct ndr_push_save *ofs,
struct ndr_push_save *save)
{
struct ndr_push_save save2;
ndr_push_save(ndr, &save2);
ndr_push_restore(ndr, ofs);
NDR_CHECK(ndr_push_u32(ndr, save2.offset - save->offset));
ndr_push_restore(ndr, &save2);
return NT_STATUS_OK;
}
/*
push a GUID
*/
NTSTATUS ndr_push_guid(struct ndr_push *ndr, GUID *guid)
{
return ndr_push_bytes(ndr, guid->info, GUID_SIZE);
}
|
