logwtmp.c revision 31329
1/* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35#if 0 36static char sccsid[] = "@(#)logwtmp.c 8.1 (Berkeley) 6/4/93"; 37#endif 38static const char rcsid[] = 39 "$Id$"; 40#endif /* not lint */ 41 42#include <sys/types.h> 43#include <sys/stat.h> 44#include <netinet/in.h> 45#include <arpa/inet.h> 46 47#include <fcntl.h> 48#include <time.h> 49#include <netdb.h> 50#include <utmp.h> 51#include <unistd.h> 52#include <stdio.h> 53#include <string.h> 54#include "extern.h" 55 56static 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 */ 63void 64ftpd_logwtmp(line, name, host) 65 char *line, *name, *host; 66{ 67 struct utmp ut; 68 struct stat buf; 69 70 if (strlen(host) > UT_HOSTSIZE) { 71 struct hostent *hp = gethostbyname(host); 72 73 if (hp != NULL) { 74 struct in_addr in; 75 76 memmove(&in, hp->h_addr, sizeof(in)); 77 host = inet_ntoa(in); 78 } else 79 host = "invalid hostname"; 80 } 81 82 if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0) 83 return; 84 if (fstat(fd, &buf) == 0) { 85 (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line)); 86 (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name)); 87 (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host)); 88 (void)time(&ut.ut_time); 89 if (write(fd, (char *)&ut, sizeof(struct utmp)) != 90 sizeof(struct utmp)) 91 (void)ftruncate(fd, buf.st_size); 92 } 93} 94