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
|
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2011-2015 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif /* HAVE_STDBOOL_H */
#include <string.h>
#include <limits.h>
#include <time.h>
#include <unistd.h>
#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_fatal.h"
#include "sudo_gettext.h"
#include "sudo_iolog.h"
#include "sudo_util.h"
/*
* Expand any escape sequences in inpath, returning the expanded path.
*/
bool
expand_iolog_path(const char *inpath, char *path, size_t pathlen,
const struct iolog_path_escape *escapes, void *closure)
{
char *dst, *pathend, tmpbuf[PATH_MAX];
const char *endbrace, *src;
bool strfit = false;
size_t len;
debug_decl(expand_iolog_path, SUDO_DEBUG_UTIL);
/* Collapse multiple leading slashes. */
while (inpath[0] == '/' && inpath[1] == '/')
inpath++;
pathend = path + pathlen;
for (src = inpath, dst = path; *src != '\0'; src++) {
if (src[0] == '%') {
if (src[1] == '{') {
endbrace = strchr(src + 2, '}');
if (endbrace != NULL) {
const struct iolog_path_escape *esc;
len = (size_t)(endbrace - src - 2);
for (esc = escapes; esc->name != NULL; esc++) {
if (strncmp(src + 2, esc->name, len) == 0 &&
esc->name[len] == '\0')
break;
}
if (esc->name != NULL) {
len = esc->copy_fn(dst, (size_t)(pathend - dst),
closure);
if (len >= (size_t)(pathend - dst))
goto bad;
dst += len;
src = endbrace;
continue;
}
}
} else if (src[1] == '%') {
/* Collapse %% -> % */
src++;
} else {
/* May need strftime() */
strfit = true;
}
}
/* Need at least 2 chars, including the NUL terminator. */
if (dst + 1 >= pathend)
goto bad;
*dst++ = *src;
}
/* Trim trailing slashes and NUL terminate. */
while (dst > path && dst[-1] == '/')
dst--;
*dst = '\0';
/* Expand strftime escapes as needed. */
if (strfit) {
time_t now;
struct tm *timeptr;
time(&now);
if ((timeptr = localtime(&now)) == NULL)
goto bad;
/* We only call strftime() on the current part of the buffer. */
tmpbuf[sizeof(tmpbuf) - 1] = '\0';
len = strftime(tmpbuf, sizeof(tmpbuf), path, timeptr);
if (len == 0 || tmpbuf[sizeof(tmpbuf) - 1] != '\0')
goto bad; /* strftime() failed, buf too small? */
if (len >= (size_t)(pathend - path))
goto bad; /* expanded buffer too big to fit. */
memcpy(path, tmpbuf, len);
dst = path + len;
*dst = '\0';
}
debug_return_bool(true);
bad:
debug_return_bool(false);
}
|
