1 /* 2 * Portions Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Portions Copyright (c) 1996, Jason Downs. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/types.h> 36 37 #include <fcntl.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <ttyent.h> 42 #include <unistd.h> 43 #include <utmp.h> 44 #include <util.h> 45 46 typedef struct utmp UTMP; 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 login(const UTMP *ut) 58 { 59 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(UTMP)), SEEK_SET); 78 79 while (1) { 80 if (read(fd, &ubuf, sizeof(UTMP)) == sizeof(UTMP)) { 81 if (!ubuf.ut_name[0]) { 82 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); 83 break; 84 } 85 topslot++; 86 } else { 87 (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), 88 SEEK_SET); 89 break; 90 } 91 } 92 93 (void)write(fd, ut, sizeof(UTMP)); 94 } 95 96 int 97 logout(const char *line) 98 { 99 UTMP ut; 100 int rval; 101 102 rval = 0; 103 if (fd < 0) 104 return(rval); 105 106 (void)lseek(fd, 0, SEEK_SET); 107 108 while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) { 109 if (!ut.ut_name[0] 110 || strncmp(ut.ut_line, line, UT_LINESIZE)) 111 continue; 112 memset(ut.ut_name, 0, UT_NAMESIZE); 113 memset(ut.ut_host, 0, UT_HOSTSIZE); 114 (void)time(&ut.ut_time); 115 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); 116 (void)write(fd, &ut, sizeof(UTMP)); 117 rval = 1; 118 } 119 return(rval); 120 } 121