1 /**
2 * xrdp: A Remote Desktop Protocol server.
3 *
4 * Copyright (C) 2021 Matt Burt
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *
18 * Enforce stream primitive checking
19 */
20
21 #if defined(HAVE_CONFIG_H)
22 #include <config_ac.h>
23 #endif
24
25 #include <stdlib.h>
26
27 #include "arch.h"
28 #include "parse.h"
29 #include "log.h"
30
31 void
parser_stream_overflow_check(const struct stream * s,int n,int is_out,const char * file,int line)32 parser_stream_overflow_check(const struct stream *s, int n, int is_out,
33 const char *file, int line)
34 {
35 /* Sanity checks */
36 if (n < 0)
37 {
38 LOG(LOG_LEVEL_ALWAYS, "%s:%d "
39 "stream primitive called with negative n=%d",
40 file, line, n);
41 abort();
42 }
43
44 if (is_out)
45 {
46 /* Output overflow */
47 if (!s_check_rem_out(s, n))
48 {
49 LOG(LOG_LEVEL_ALWAYS, "%s:%d Stream output buffer overflow. "
50 "Size=%d, pos=%d, requested=%d", file, line,
51 s->size, (int)(s->p - s->data), n);
52 abort();
53 }
54 }
55 else
56 {
57 /* Input overflow */
58 if (!s_check_rem(s, n))
59 {
60 LOG(LOG_LEVEL_ALWAYS, "%s:%d Stream input buffer overflow. "
61 "Max=%d, pos=%d, requested=%d", file, line,
62 (int)(s->end - s->data), (int)(s->p - s->data), n);
63 abort();
64 }
65 }
66 }
67