1 /* $OpenBSD: logout.c,v 1.7 2004/05/28 07:03:47 deraadt Exp $ */ 2 /* 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 32 /* from: static char sccsid[] = "@(#)logout.c 8.1 (Berkeley) 6/4/93"; */ 33 static const char rcsid[] = "$Id: logout.c,v 1.7 2004/05/28 07:03:47 deraadt Exp $"; 34 #endif /* LIBC_SCCS and not lint */ 35 36 #include <sys/types.h> 37 #include <sys/time.h> 38 39 #include <fcntl.h> 40 #include <utmp.h> 41 #include <unistd.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "util.h" 46 47 typedef struct utmp UTMP; 48 49 int 50 logout(const char *line) 51 { 52 int fd, rval; 53 UTMP ut; 54 55 if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0) 56 return(0); 57 rval = 0; 58 while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) { 59 if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE)) 60 continue; 61 bzero(ut.ut_name, UT_NAMESIZE); 62 bzero(ut.ut_host, UT_HOSTSIZE); 63 (void)time(&ut.ut_time); 64 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); 65 (void)write(fd, &ut, sizeof(UTMP)); 66 rval = 1; 67 } 68 (void)close(fd); 69 return(rval); 70 } 71