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 39 #include <err.h> 40 #include <pwd.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <time.h> 44 #include <utmp.h> 45 #include <unistd.h> 46 47 static void output(struct passwd *, struct lastlog *); 48 static void usage(void); 49 50 int 51 main(int argc, char **argv) 52 { 53 int ch, i; 54 FILE *fp; 55 struct passwd *passwd; 56 struct lastlog last; 57 58 while ((ch = getopt(argc, argv, "")) != -1) { 59 usage(); 60 } 61 62 if ((fp = fopen(_PATH_LASTLOG, "r")) == NULL) 63 err(1, "%s", _PATH_LASTLOG); 64 65 setpassent(1); /* Keep passwd file pointers open */ 66 67 /* Process usernames given on the command line. */ 68 if (argc > 1) { 69 long offset; 70 for (i = 1; i < argc; ++i) { 71 if ((passwd = getpwnam(argv[i])) == NULL) { 72 warnx("user '%s' not found", argv[i]); 73 continue; 74 } 75 /* Calculate the offset into the lastlog file. */ 76 offset = (long)(passwd->pw_uid * sizeof(last)); 77 if (fseek(fp, offset, SEEK_SET)) { 78 warn("fseek error"); 79 continue; 80 } 81 if (fread(&last, sizeof(last), 1, fp) != 1) { 82 warnx("fread error on '%s'", passwd->pw_name); 83 clearerr(fp); 84 continue; 85 } 86 output(passwd, &last); 87 } 88 } 89 /* Read all lastlog entries, looking for active ones */ 90 else { 91 for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) { 92 if (last.ll_time == 0) 93 continue; 94 if ((passwd = getpwuid((uid_t)i)) != NULL) 95 output(passwd, &last); 96 } 97 if (ferror(fp)) 98 warnx("fread error"); 99 } 100 101 setpassent(0); /* Close passwd file pointers */ 102 103 fclose(fp); 104 exit(0); 105 } 106 107 /* Duplicate the output of last(1) */ 108 static void 109 output(struct passwd *p, struct lastlog *l) 110 { 111 printf("%-*.*s %-*.*s %-*.*s %s", 112 UT_NAMESIZE, UT_NAMESIZE, p->pw_name, 113 UT_LINESIZE, UT_LINESIZE, l->ll_line, 114 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host, 115 (l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n"); 116 } 117 118 static void 119 usage(void) 120 { 121 fprintf(stderr, "usage: lastlogin [user ...]\n"); 122 exit(1); 123 } 124