1 /* 2 * Portions 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Portions Copyright (c) 1996, Jason Downs. All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 42 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS 43 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 44 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 45 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, 46 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 47 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 48 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 49 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 */ 54 55 #include <sys/types.h> 56 #include <sys/param.h> 57 58 #include <fcntl.h> 59 #include <setjmp.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <ttyent.h> 64 #include <unistd.h> 65 #include <utmp.h> 66 #ifdef SUPPORT_UTMPX 67 #include <utmpx.h> 68 #endif 69 #include <util.h> 70 71 #include "extern.h" 72 73 typedef struct utmp UTMP; 74 75 static int fd = -1; 76 static int topslot = -1; 77 78 /* 79 * Special versions of login()/logout() which hold the utmp file open, 80 * for use with ftpd. 81 */ 82 83 void 84 ftpd_login(const struct utmp *ut) 85 { 86 UTMP ubuf; 87 88 /* 89 * First, loop through /etc/ttys, if needed, to initialize the 90 * top of the tty slots, since ftpd has no tty. 91 */ 92 if (topslot < 0) { 93 topslot = 0; 94 while (getttyent() != (struct ttyent *)NULL) 95 topslot++; 96 } 97 if ((topslot < 0) || ((fd < 0) 98 && (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) < 0)) 99 return; 100 101 /* 102 * Now find a slot that's not in use... 103 */ 104 (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET); 105 106 while (1) { 107 if (read(fd, &ubuf, sizeof(UTMP)) == sizeof(UTMP)) { 108 if (!ubuf.ut_name[0]) { 109 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); 110 break; 111 } 112 topslot++; 113 } else { 114 (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), 115 SEEK_SET); 116 break; 117 } 118 } 119 120 (void)write(fd, ut, sizeof(UTMP)); 121 } 122 123 int 124 ftpd_logout(const char *line) 125 { 126 UTMP ut; 127 int rval; 128 129 rval = 0; 130 if (fd < 0) 131 return(rval); 132 133 (void)lseek(fd, 0, SEEK_SET); 134 135 while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) { 136 if (!ut.ut_name[0] 137 || strncmp(ut.ut_line, line, UT_LINESIZE)) 138 continue; 139 memset(ut.ut_name, 0, UT_NAMESIZE); 140 memset(ut.ut_host, 0, UT_HOSTSIZE); 141 (void)time(&ut.ut_time); 142 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); 143 (void)write(fd, &ut, sizeof(UTMP)); 144 rval = 1; 145 } 146 return(rval); 147 } 148 149 #ifdef SUPPORT_UTMPX 150 /* 151 * special version of loginx which updates utmpx only. 152 */ 153 void 154 ftpd_loginx(const struct utmpx *ut) 155 { 156 (void)pututxline(ut); 157 } 158 #endif 159