1 /* 2 * Copyright (c) 1996 John M. Vinopal 3 * 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 for the NetBSD Project 16 * by John M. Vinopal. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $NetBSD: lastlogin.c,v 1.4 1998/02/03 04:45:35 perry Exp $ 33 * $FreeBSD: src/usr.sbin/lastlogin/lastlogin.c,v 1.2.2.2 2001/07/19 05:02:46 kris Exp $ 34 * $DragonFly: src/usr.sbin/lastlogin/lastlogin.c,v 1.5 2004/11/13 16:14:33 liamfoy Exp $ 35 */ 36 37 #include <sys/cdefs.h> 38 #include <sys/user.h> 39 40 #include <err.h> 41 #include <pwd.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <time.h> 45 #include <utmp.h> 46 #include <utmpx.h> 47 #include <unistd.h> 48 49 static void output(struct passwd *, struct lastlog *); 50 static void outputx(struct passwd *, struct lastlogx *); 51 static void usage(void); 52 53 int 54 main(int argc, char **argv) 55 { 56 int ch, i; 57 long offset; 58 FILE *fp; 59 struct passwd *passwd; 60 struct lastlog last; 61 struct lastlogx lastx; 62 63 while ((ch = getopt(argc, argv, "")) != -1) { 64 usage(); 65 } 66 67 if ((fp = fopen(_PATH_LASTLOG, "r")) == NULL) 68 err(1, "%s", _PATH_LASTLOG); 69 70 setpassent(1); /* Keep passwd file pointers open */ 71 72 /* Process usernames given on the command line. */ 73 if (argc > 1) { 74 for (i = 1; i < argc; ++i) { 75 if ((passwd = getpwnam(argv[i])) == NULL) { 76 warnx("user '%s' not found", argv[i]); 77 continue; 78 } 79 if ((getlastlogx(_PATH_LASTLOGX, passwd->pw_uid, 80 &lastx)) != NULL) { 81 outputx(passwd, &lastx); 82 goto done; 83 } 84 /* Calculate the offset into the lastlog file. */ 85 offset = (long)(passwd->pw_uid * sizeof(last)); 86 if (fseek(fp, offset, SEEK_SET)) { 87 warn("fseek error"); 88 continue; 89 } 90 if (fread(&last, sizeof(last), 1, fp) != 1) { 91 warnx("fread error on '%s'", passwd->pw_name); 92 clearerr(fp); 93 continue; 94 } 95 output(passwd, &last); 96 } 97 } 98 /* Read all lastlog entries, looking for active ones */ 99 else { 100 while ((passwd = getpwent()) != NULL) { 101 if ((getlastlogx(_PATH_LASTLOGX, passwd->pw_uid, 102 &lastx)) != NULL) { 103 if (lastx.ll_tv.tv_sec == 0) 104 continue; 105 outputx(passwd, &lastx); 106 } else { 107 offset = (long)(passwd->pw_uid * sizeof(last)); 108 109 if (fseek(fp, offset, SEEK_SET)) { 110 continue; 111 } 112 if (fread(&last, sizeof(last), 1, fp) != 1) { 113 continue; 114 } 115 if (last.ll_time == 0) 116 continue; 117 output(passwd, &last); 118 } 119 } 120 #if 0 121 for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) { 122 if (last.ll_time == 0) 123 continue; 124 if ((passwd = getpwuid((uid_t)i)) != NULL) 125 output(passwd, &last); 126 } 127 if (ferror(fp)) 128 warnx("fread error"); 129 #endif 130 } 131 132 done: 133 setpassent(0); /* Close passwd file pointers */ 134 135 fclose(fp); 136 exit(0); 137 } 138 139 /* Duplicate the output of last(1) */ 140 static void 141 output(struct passwd *p, struct lastlog *l) 142 { 143 printf("%-*.*s %-*.*s %-*.*s %s", 144 UT_NAMESIZE, UT_NAMESIZE, p->pw_name, 145 UT_LINESIZE+4, UT_LINESIZE+4, l->ll_line, 146 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host, 147 (l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n"); 148 } 149 150 static void 151 outputx(struct passwd *p, struct lastlogx *l) 152 { 153 printf("%-*.*s %-*.*s %-*.*s %s", 154 UT_NAMESIZE, UT_NAMESIZE, p->pw_name, 155 UT_LINESIZE+4, UT_LINESIZE+4, l->ll_line, 156 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host, 157 (l->ll_tv.tv_sec) ? ctime((&l->ll_tv.tv_sec)) : "Never logged in\n"); 158 } 159 160 static void 161 usage(void) 162 { 163 fprintf(stderr, "usage: lastlogin [user ...]\n"); 164 exit(1); 165 } 166