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
|
/*
libfakechroot -- fake chroot environment
Copyright (c) 2010, 2013 Piotr Roszatycki <dexter@debian.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <config.h>
#ifdef HAVE_READLINKAT
#define _ATFILE_SOURCE
#include <sys/types.h>
#include <stddef.h>
#include "libfakechroot.h"
wrapper(readlinkat, ssize_t, (int dirfd, const char * path, char * buf, size_t bufsiz))
{
int linksize;
char tmp[FAKECHROOT_PATH_MAX], *tmpptr;
const char *fakechroot_base = getenv("FAKECHROOT_BASE");
debug("readlinkat(%d, \"%s\", &buf, %zd)", dirfd, path, bufsiz);
expand_chroot_path_at(dirfd, path);
if ((linksize = nextcall(readlinkat)(dirfd, path, tmp, FAKECHROOT_PATH_MAX-1)) == -1) {
return -1;
}
tmp[linksize] = '\0';
if (fakechroot_base != NULL) {
tmpptr = strstr(tmp, fakechroot_base);
if (tmpptr != tmp) {
tmpptr = tmp;
}
else if (tmp[strlen(fakechroot_base)] == '\0') {
tmpptr = "/";
linksize = strlen(tmpptr);
}
else if (tmp[strlen(fakechroot_base)] == '/') {
tmpptr = tmp + strlen(fakechroot_base);
linksize -= strlen(fakechroot_base);
}
else {
tmpptr = tmp;
}
if (strlen(tmpptr) > bufsiz) {
linksize = bufsiz;
}
strncpy(buf, tmpptr, linksize);
}
else {
strncpy(buf, tmp, linksize);
}
return linksize;
}
#else
typedef int empty_translation_unit;
#endif
|