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 */ 35 36 #include <sys/user.h> 37 38 #include <err.h> 39 #include <pwd.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <time.h> 43 #include <utmp.h> 44 #include <utmpx.h> 45 #include <unistd.h> 46 47 static void output(struct passwd *, struct lastlog *); 48 static void outputx(struct passwd *, struct lastlogx *); 49 static void usage(void); 50 51 int 52 main(int argc, char **argv) 53 { 54 int ch, i; 55 long offset; 56 FILE *fp; 57 struct passwd *passwd; 58 struct lastlog last; 59 struct lastlogx lastx; 60 61 while ((ch = getopt(argc, argv, "")) != -1) { 62 usage(); 63 } 64 65 if ((fp = fopen(_PATH_LASTLOG, "r")) == NULL) 66 err(1, "%s", _PATH_LASTLOG); 67 68 setpassent(1); /* Keep passwd file pointers open */ 69 70 /* Process usernames given on the command line. */ 71 if (argc > 1) { 72 for (i = 1; i < argc; ++i) { 73 if ((passwd = getpwnam(argv[i])) == NULL) { 74 warnx("user '%s' not found", argv[i]); 75 continue; 76 } 77 if ((getlastlogx(_PATH_LASTLOGX, passwd->pw_uid, 78 &lastx)) != NULL) { 79 outputx(passwd, &lastx); 80 goto done; 81 } 82 /* Calculate the offset into the lastlog file. */ 83 offset = (long)(passwd->pw_uid * sizeof(last)); 84 if (fseek(fp, offset, SEEK_SET)) { 85 warn("fseek error"); 86 continue; 87 } 88 if (fread(&last, sizeof(last), 1, fp) != 1) { 89 warnx("fread error on '%s'", passwd->pw_name); 90 clearerr(fp); 91 continue; 92 } 93 output(passwd, &last); 94 } 95 } 96 /* Read all lastlog entries, looking for active ones */ 97 else { 98 while ((passwd = getpwent()) != NULL) { 99 if ((getlastlogx(_PATH_LASTLOGX, passwd->pw_uid, 100 &lastx)) != NULL) { 101 if (lastx.ll_tv.tv_sec == 0) 102 continue; 103 outputx(passwd, &lastx); 104 } else { 105 offset = (long)(passwd->pw_uid * sizeof(last)); 106 107 if (fseek(fp, offset, SEEK_SET)) { 108 continue; 109 } 110 if (fread(&last, sizeof(last), 1, fp) != 1) { 111 continue; 112 } 113 if (last.ll_time == 0) 114 continue; 115 output(passwd, &last); 116 } 117 } 118 #if 0 119 for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) { 120 if (last.ll_time == 0) 121 continue; 122 if ((passwd = getpwuid((uid_t)i)) != NULL) 123 output(passwd, &last); 124 } 125 if (ferror(fp)) 126 warnx("fread error"); 127 #endif 128 } 129 130 done: 131 setpassent(0); /* Close passwd file pointers */ 132 133 fclose(fp); 134 exit(0); 135 } 136 137 /* Duplicate the output of last(1) */ 138 static void 139 output(struct passwd *p, struct lastlog *l) 140 { 141 printf("%-*.*s %-*.*s %-*.*s %s", 142 UT_NAMESIZE, UT_NAMESIZE, p->pw_name, 143 UT_LINESIZE+4, UT_LINESIZE+4, l->ll_line, 144 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host, 145 (l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n"); 146 } 147 148 static void 149 outputx(struct passwd *p, struct lastlogx *l) 150 { 151 printf("%-*.*s %-*.*s %-*.*s %s", 152 UT_NAMESIZE, UT_NAMESIZE, p->pw_name, 153 UT_LINESIZE+4, UT_LINESIZE+4, l->ll_line, 154 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host, 155 (l->ll_tv.tv_sec) ? ctime((&l->ll_tv.tv_sec)) : "Never logged in\n"); 156 } 157 158 static void 159 usage(void) 160 { 161 fprintf(stderr, "usage: lastlogin [user ...]\n"); 162 exit(1); 163 } 164