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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);
- }
-