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