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/* 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);
}
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