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
|
/* tstout.c
Put together by Ian Lance Taylor <ian@airs.com>
This program is used to logout a program run by the tstuu program.
I needed this because on Ultrix 4.0 I can't get the uucp program
to run without invoking it via /bin/login and having it start up
as a shell. If I don't do it this way, it gets a SIGSEGV trap
for some reason. Most systems probably don't need to do things
this way. It will only work on BSD systems anyhow, I suspect.
The code for this comes from "UNIX Network Programming" by W.
Richard Stevens, Prentice-Hall 1990. Most of it is from 4.3BSD, as
noted in the comments.
This program must run suid to root.
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <utmp.h>
static int logout P((const char *zdev));
static void logwtmp P((const char *zdev, const char *zname,
const char *zhost));
int
main (argc, argv)
int argc;
char **argv;
{
char *z;
if (argc != 2
|| strncmp (argv[1], "/dev/", sizeof "/dev/" - 1) != 0)
{
fprintf (stderr, "Usage: tstout device\n");
exit (EXIT_FAILURE);
}
z = argv[1] + 5;
if (logout (z))
logwtmp (z, "", "");
chmod (argv[1], 0666);
chown (argv[1], 0, 0);
*z = 'p';
chmod (argv[1], 0666);
chown (argv[1], 0, 0);
exit (EXIT_SUCCESS);
}
/*
* Copyright (c) 1988 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)logout.c 5.2 (Berkeley) 2/17/89";
#endif /* LIBC_SCCS and not lint */
#define UTMPFILE "/etc/utmp"
/* 0 on failure, 1 on success */
static int
logout(line)
register const char *line;
{
register FILE *fp;
struct utmp ut;
int rval;
time_t time();
if (!(fp = fopen(UTMPFILE, "r+")))
return(0);
rval = 0;
while (fread((char *)&ut, sizeof(struct utmp), 1, fp) == 1) {
if (!ut.ut_name[0] ||
strncmp(ut.ut_line, line, sizeof(ut.ut_line)))
continue;
bzero(ut.ut_name, sizeof(ut.ut_name));
bzero(ut.ut_host, sizeof(ut.ut_host));
(void)time((time_t *)&ut.ut_time);
(void)fseek(fp, (long)-sizeof(struct utmp), L_INCR);
(void)fwrite((char *)&ut, sizeof(struct utmp), 1, fp);
(void)fseek(fp, (long)0, L_INCR);
rval = 1;
}
(void)fclose(fp);
return(rval);
}
/*
* Copyright (c) 1988 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)logwtmp.c 5.2 (Berkeley) 9/20/88";
#endif /* LIBC_SCCS and not lint */
#define WTMPFILE "/usr/adm/wtmp"
static void
logwtmp(line, name, host)
const char *line, *name, *host;
{
struct utmp ut;
struct stat buf;
int fd;
time_t time();
char *strncpy();
if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
return;
if (!fstat(fd, &buf)) {
(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
(void)time((time_t *)&ut.ut_time);
if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
sizeof(struct utmp))
(void)ftruncate(fd, buf.st_size);
}
(void)close(fd);
}
|
