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
|
/*
* klibc_fixups.c - very simple implementation of stuff missing in klibc
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004 Kay Sievers <kay@vrfy.org>
*
* 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 version 2 of the License.
*
* 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.
*
*/
#ifdef __KLIBC__
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/types.h>
#include "klibc_fixups.h"
#include "logging.h"
#define PW_FILE "/etc/passwd"
#define GR_FILE "/etc/group"
#define UTMP_FILE "/var/run/utmp"
/* return the id of a passwd style line, selected by the users name */
static unsigned long get_id_by_name(const char *uname, const char *dbfile)
{
unsigned long id = -1;
FILE *file;
char buf[255];
char *pos;
char *name;
char *idstr;
char *tail;
file = fopen(dbfile, "r");
if (file == NULL) {
dbg("unable to open file '%s'", dbfile);
return -1;
}
while (1) {
pos = fgets(buf, sizeof(buf), file);
if (pos == NULL)
break;
/* get name */
name = strsep(&pos, ":");
if (name == NULL)
continue;
/* skip pass */
if (strsep(&pos, ":") == NULL)
continue;
/* get id */
idstr = strsep(&pos, ":");
if (idstr == NULL)
continue;
if (strcmp(uname, name) == 0) {
id = strtoul(idstr, &tail, 10);
if (tail[0] != '\0')
id = -1;
else
dbg("id for '%s' is '%li'", name, id);
break;
}
}
fclose(file);
return id;
}
struct passwd *getpwnam(const char *name)
{
static struct passwd pw;
memset(&pw, 0x00, sizeof(struct passwd));
pw.pw_uid = (uid_t) get_id_by_name(name, PW_FILE);
if (pw.pw_uid < 0)
return NULL;
else
return &pw;
}
struct group *getgrnam(const char *name)
{
static struct group gr;
memset(&gr, 0x00, sizeof(struct group));
gr.gr_gid = (gid_t) get_id_by_name(name, GR_FILE);
if (gr.gr_gid < 0)
return NULL;
else
return &gr;
}
int ufd = -1;
void setutent()
{
if (ufd < 0)
ufd = open(UTMP_FILE, O_RDONLY);
fcntl(ufd, F_SETFD, FD_CLOEXEC);
lseek(ufd, 0, SEEK_SET);
}
void endutent() {
if (ufd < 0)
return;
close(ufd);
ufd = -1;
}
struct utmp *getutent(void)
{
static struct utmp utmp;
int retval;
if (ufd < 0) {
setutent();
if (ufd < 0)
return NULL;
}
retval = read(ufd, &utmp, sizeof(struct utmp));
if (retval < 1)
return NULL;
return &utmp;
}
#endif
|
