1 /* $OpenBSD: logutmp.c,v 1.14 2019/06/28 13:32:53 deraadt Exp $ */ 2 /* 3 * Portions Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * Portions Copyright (c) 1996, Jason Downs. 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/time.h> 34 #include <sys/socket.h> 35 #include <netinet/in.h> 36 #include <netinet/ip.h> 37 #include <netinet/tcp.h> 38 39 #include <fcntl.h> 40 #include <unistd.h> 41 #include <stdlib.h> 42 #include <utmp.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <ttyent.h> 46 47 #include "monitor.h" 48 #include "extern.h" 49 50 static int fd = -1; 51 static int topslot = -1; 52 53 /* 54 * Special versions of login()/logout() which hold the utmp file open, 55 * for use with ftpd. 56 */ 57 58 void 59 ftpd_login(struct utmp *ut) 60 { 61 struct utmp ubuf; 62 63 /* 64 * First, loop through /etc/ttys, if needed, to initialize the 65 * top of the tty slots, since ftpd has no tty. 66 */ 67 if (topslot < 0) { 68 topslot = 0; 69 while (getttyent() != (struct ttyent *)NULL) 70 topslot++; 71 } 72 if ((topslot < 0) || ((fd < 0) && 73 (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) == -1)) 74 return; 75 76 /* 77 * Now find a slot that's not in use... 78 */ 79 (void)lseek(fd, (off_t)topslot * sizeof(struct utmp), SEEK_SET); 80 81 while (1) { 82 if (read(fd, &ubuf, sizeof(struct utmp)) == 83 sizeof(struct utmp)) { 84 if (!ubuf.ut_name[0]) { 85 (void)lseek(fd, -(off_t)sizeof(struct utmp), 86 SEEK_CUR); 87 break; 88 } 89 topslot++; 90 } else { 91 (void)lseek(fd, (off_t)topslot * sizeof(struct utmp), 92 SEEK_SET); 93 break; 94 } 95 } 96 97 (void)write(fd, ut, sizeof(struct utmp)); 98 } 99 100 int 101 ftpd_logout(char *line) 102 { 103 struct timeval tv; 104 struct utmp ut; 105 int rval; 106 107 rval = 0; 108 if (fd < 0) 109 return(rval); 110 111 (void)lseek(fd, 0, SEEK_SET); 112 113 while (read(fd, &ut, sizeof(struct utmp)) == sizeof(struct utmp)) { 114 if (!ut.ut_name[0] || 115 strncmp(ut.ut_line, line, UT_LINESIZE)) 116 continue; 117 bzero(ut.ut_name, UT_NAMESIZE); 118 bzero(ut.ut_host, UT_HOSTSIZE); 119 gettimeofday(&tv, NULL); 120 ut.ut_time = tv.tv_sec; 121 (void)lseek(fd, -(off_t)sizeof(struct utmp), SEEK_CUR); 122 (void)write(fd, &ut, sizeof(struct utmp)); 123 rval = 1; 124 } 125 return(rval); 126 } 127