blob: f69376b0196c38b6b8a7ae4e23fe47a133c458e4 (
plain)
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
|
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* access() euid/egid implementation
*/
#include <ast.h>
#include <errno.h>
#include <ls.h>
#include "FEATURE/eaccess"
#if _lib_eaccess
NoN(eaccess)
#else
#if defined(__EXPORT__)
#define extern __EXPORT__
#endif
extern int
eaccess(const char* path, register int flags)
{
#ifdef EFF_ONLY_OK
return access(path, flags|EFF_ONLY_OK);
#else
#if _lib_euidaccess
return euidaccess(path, flags);
#else
register int mode;
struct stat st;
static int init;
static uid_t ruid;
static uid_t euid;
static gid_t rgid;
static gid_t egid;
if (!init)
{
ruid = getuid();
euid = geteuid();
rgid = getgid();
egid = getegid();
init = (ruid == euid && rgid == egid) ? 1 : -1;
}
if (init > 0 || flags == F_OK)
return access(path, flags);
if (stat(path, &st))
return -1;
mode = 0;
if (euid == 0)
{
if (!S_ISREG(st.st_mode) || !(flags & X_OK) || (st.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
return 0;
goto nope;
}
else if (euid == st.st_uid)
{
if (flags & R_OK)
mode |= S_IRUSR;
if (flags & W_OK)
mode |= S_IWUSR;
if (flags & X_OK)
mode |= S_IXUSR;
}
else if (egid == st.st_gid)
{
#if _lib_getgroups
setgroup:
#endif
if (flags & R_OK)
mode |= S_IRGRP;
if (flags & W_OK)
mode |= S_IWGRP;
if (flags & X_OK)
mode |= S_IXGRP;
}
else
{
#if _lib_getgroups
register int n;
static int ngroups = -2;
static gid_t* groups;
if (ngroups == -2)
{
if ((ngroups = getgroups(0, (gid_t*)0)) <= 0)
ngroups = NGROUPS_MAX;
if (!(groups = newof(0, gid_t, ngroups + 1, 0)))
ngroups = -1;
else
ngroups = getgroups(ngroups, groups);
}
n = ngroups;
while (--n >= 0)
if (groups[n] == st.st_gid)
goto setgroup;
#endif
if (flags & R_OK)
mode |= S_IROTH;
if (flags & W_OK)
mode |= S_IWOTH;
if (flags & X_OK)
mode |= S_IXOTH;
}
if ((st.st_mode & mode) == mode)
return 0;
nope:
errno = EACCES;
return -1;
#endif
#endif
}
#endif
|
