1 /* $OpenBSD: logwtmp.c,v 1.9 2004/11/28 20:24:51 deraadt Exp $ */ 2 /* $NetBSD: logwtmp.c,v 1.4 1995/04/11 02:44:58 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 */ 33 34 #ifndef lint 35 #if 0 36 static const char sccsid[] = "@(#)logwtmp.c 8.1 (Berkeley) 6/4/93"; 37 #else 38 static const char rcsid[] = 39 "$OpenBSD: logwtmp.c,v 1.9 2004/11/28 20:24:51 deraadt Exp $"; 40 #endif 41 #endif /* not lint */ 42 43 #include <sys/types.h> 44 #include <sys/time.h> 45 #include <sys/stat.h> 46 47 #include <fcntl.h> 48 #include <utmp.h> 49 #include <unistd.h> 50 #include <stdio.h> 51 #include <string.h> 52 53 #include <netinet/in.h> 54 #include "extern.h" 55 56 static int fd = -1; 57 58 /* 59 * Modified version of logwtmp that holds wtmp file open 60 * after first call, for use with ftp (which may chroot 61 * after login, but before logout). 62 */ 63 void 64 ftpdlogwtmp(char *line, char *name, char *host) 65 { 66 struct timeval tv; 67 struct stat buf; 68 struct utmp ut; 69 70 if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0) 71 return; 72 if (fstat(fd, &buf) == 0) { 73 (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line)); 74 (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name)); 75 (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host)); 76 gettimeofday(&tv, NULL); 77 ut.ut_time = tv.tv_sec; 78 if (write(fd, (char *)&ut, sizeof(struct utmp)) != 79 sizeof(struct utmp)) 80 (void)ftruncate(fd, buf.st_size); 81 } 82 } 83