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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/* vi: set sw=4 ts=4: */
/*
* deluser (remove lusers from the system ;) for TinyLogin
*
*
* Copyright (C) 1999 by Lineo, inc.
* Written by John Beppu <beppu@lineo.com>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "busybox.h"
#define PASSWD_FILE "/etc/passwd"
#define GROUP_FILE "/etc/group"
/* where to start and stop deletion */
typedef struct {
size_t start;
size_t stop;
} Bounds;
/* An interesting side-effect of boundary()'s
* implementation is that the first user (typically root)
* cannot be removed. Let's call it a feature. */
static Bounds boundary(const char *buffer, const char *login)
{
char needle[256];
char *start;
char *stop;
Bounds b;
snprintf(needle, 256, "\n%s", login);
needle[255] = 0;
start = strstr(buffer, needle);
if (!start) {
b.start = 0;
b.stop = 0;
return b;
}
start++;
stop = index(start, '\n'); /* index is a BSD-ism */
b.start = start - buffer;
b.stop = stop - buffer;
return b;
}
/* grep -v ^login (except it only deletes the first match) */
/* ...in fact, I think I'm going to simplify this later */
static int del_line_matching(char *login, char *filename)
{
char *buffer;
FILE *passwd;
size_t len;
Bounds b;
struct stat statbuf;
/* load into buffer */
passwd = fopen(filename, "r");
if (!passwd) {
return 1;
}
stat(filename, &statbuf);
len = statbuf.st_size;
buffer = (char *) malloc(len * sizeof(char));
if (!buffer) {
fclose(passwd);
return 1;
}
fread(buffer, len, sizeof(char), passwd);
fclose(passwd);
/* find the user to remove */
b = boundary(buffer, login);
if (b.stop == 0) {
free(buffer);
return 1;
}
/* write the file w/o the user */
passwd = fopen(filename, "w");
if (!passwd) {
return 1;
}
fwrite(buffer, (b.start - 1), sizeof(char), passwd);
fwrite(&buffer[b.stop], (len - b.stop), sizeof(char), passwd);
fclose(passwd);
return 0;
}
/* ________________________________________________________________________ */
int delgroup_main(int argc, char **argv)
{
/* int successful; */
int failure;
if (argc != 2) {
show_usage();
} else {
failure = del_line_matching(argv[1], GROUP_FILE);
#ifdef TLG_FEATURE_SHADOWPASSWDS
if (access(GSHADOW_FILE, W_OK) == 0) {
/* EDR the |= works if the error is not 0, so he had it wrong */
failure |= del_line_matching(argv[1], GSHADOW_FILE);
}
#endif /* TLG_FEATURE_SHADOWPASSWDS */
/* if (!successful) { */
if (failure) {
error_msg_and_die("%s: Group could not be removed\n", argv[1]);
}
}
return (EXIT_SUCCESS);
}
/* ________________________________________________________________________ */
int deluser_main(int argc, char **argv)
{
/* int successful; */
int failure;
if (argc != 2) {
show_usage();
} else {
failure = del_line_matching(argv[1], PASSWD_FILE);
/* if (!successful) { */
if (failure) {
error_msg_and_die("%s: User could not be removed from %s\n",
argv[1], PASSWD_FILE);
}
#ifdef TLG_FEATURE_SHADOWPASSWDS
failure = del_line_matching(argv[1], SHADOW_FILE);
/* if (!successful) { */
if (failure) {
error_msg_and_die("%s: User could not be removed from %s\n",
argv[1], SHADOW_FILE);
}
#endif /* TLG_FEATURE_SHADOWPASSWDS */
failure = del_line_matching(argv[1], GROUP_FILE);
/* if (!successful) { */
if (failure) {
error_msg_and_die("%s: User could not be removed from %s\n",
argv[1], GROUP_FILE);
}
}
return (EXIT_SUCCESS);
}
/* $Id: deluser.c,v 1.1 2001/08/21 16:18:59 andersen Exp $ */
|
