1 /* $OpenBSD: logutmp.c,v 1.7 2003/07/07 03:18:11 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/socket.h> 34 #include <netinet/in.h> 35 #include <netinet/in_systm.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 #include "extern.h" 47 48 static int fd = -1; 49 static int topslot = -1; 50 51 /* 52 * Special versions of login()/logout() which hold the utmp file open, 53 * for use with ftpd. 54 */ 55 56 void 57 ftpd_login(struct utmp *ut) 58 { 59 struct utmp ubuf; 60 61 /* 62 * First, loop through /etc/ttys, if needed, to initialize the 63 * top of the tty slots, since ftpd has no tty. 64 */ 65 if (topslot < 0) { 66 topslot = 0; 67 while (getttyent() != (struct ttyent *)NULL) 68 topslot++; 69 } 70 if ((topslot < 0) || ((fd < 0) && 71 (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) < 0)) 72 return; 73 74 /* 75 * Now find a slot that's not in use... 76 */ 77 (void)lseek(fd, (off_t)(topslot * sizeof(struct utmp)), SEEK_SET); 78 79 while (1) { 80 if (read(fd, &ubuf, sizeof(struct utmp)) == 81 sizeof(struct utmp)) { 82 if (!ubuf.ut_name[0]) { 83 (void)lseek(fd, -(off_t)sizeof(struct utmp), 84 SEEK_CUR); 85 break; 86 } 87 topslot++; 88 } else { 89 (void)lseek(fd, (off_t)(topslot * 90 sizeof(struct utmp)), SEEK_SET); 91 break; 92 } 93 } 94 95 (void)write(fd, ut, sizeof(struct utmp)); 96 } 97 98 int 99 ftpd_logout(char *line) 100 { 101 struct utmp ut; 102 int rval; 103 104 rval = 0; 105 if (fd < 0) 106 return(rval); 107 108 (void)lseek(fd, 0, SEEK_SET); 109 110 while (read(fd, &ut, sizeof(struct utmp)) == sizeof(struct utmp)) { 111 if (!ut.ut_name[0] || 112 strncmp(ut.ut_line, line, UT_LINESIZE)) 113 continue; 114 bzero(ut.ut_name, UT_NAMESIZE); 115 bzero(ut.ut_host, UT_HOSTSIZE); 116 (void)time(&ut.ut_time); 117 (void)lseek(fd, -(off_t)sizeof(struct utmp), SEEK_CUR); 118 (void)write(fd, &ut, sizeof(struct utmp)); 119 rval = 1; 120 } 121 return(rval); 122 } 123