1 /* $NetBSD: logwtmp.c,v 1.16 2001/02/04 22:04:12 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 */ 36 37 38 #include <sys/cdefs.h> 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)logwtmp.c 8.1 (Berkeley) 6/4/93"; 42 #else 43 __RCSID("$NetBSD: logwtmp.c,v 1.16 2001/02/04 22:04:12 christos Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/types.h> 48 #include <sys/param.h> 49 #include <sys/time.h> 50 #include <sys/stat.h> 51 52 #include <fcntl.h> 53 #include <setjmp.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <string.h> 57 #include <time.h> 58 #include <unistd.h> 59 #include <utmp.h> 60 #include <util.h> 61 62 #ifdef KERBEROS5 63 #include <krb5/krb5.h> 64 #endif 65 66 #include "extern.h" 67 68 static int fd = -1; 69 70 /* 71 * Modified version of logwtmp that holds wtmp file open 72 * after first call, for use with ftp (which may chroot 73 * after login, but before logout). 74 */ 75 void 76 logwtmp(const char *line, const char *name, const char *host) 77 { 78 struct utmp ut; 79 struct stat buf; 80 81 if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0) 82 return; 83 if (fstat(fd, &buf) == 0) { 84 (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line)); 85 (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name)); 86 (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host)); 87 (void)time(&ut.ut_time); 88 if (write(fd, (char *)&ut, sizeof(struct utmp)) != 89 sizeof(struct utmp)) 90 (void)ftruncate(fd, buf.st_size); 91 } 92 } 93