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 1.4 2003/11/16 15:17:36 eirikn 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 const char *logfile = _PATH_LASTLOG; 48 49 int main(int, char **); 50 static void output(struct passwd *, struct lastlog *); 51 static void usage(void); 52 53 int 54 main(int argc, char **argv) 55 { 56 int ch, i; 57 FILE *fp; 58 struct passwd *passwd; 59 struct lastlog last; 60 61 while ((ch = getopt(argc, argv, "")) != -1) { 62 usage(); 63 } 64 65 fp = fopen(logfile, "r"); 66 if (fp == NULL) 67 err(1, "%s", logfile); 68 69 setpassent(1); /* Keep passwd file pointers open */ 70 71 /* Process usernames given on the command line. */ 72 if (argc > 1) { 73 long offset; 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 /* Calculate the offset into the lastlog file. */ 80 offset = (long)(passwd->pw_uid * sizeof(last)); 81 if (fseek(fp, offset, SEEK_SET)) { 82 warn("fseek error"); 83 continue; 84 } 85 if (fread(&last, sizeof(last), 1, fp) != 1) { 86 warnx("fread error on '%s'", passwd->pw_name); 87 clearerr(fp); 88 continue; 89 } 90 output(passwd, &last); 91 } 92 } 93 /* Read all lastlog entries, looking for active ones */ 94 else { 95 for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) { 96 if (last.ll_time == 0) 97 continue; 98 if ((passwd = getpwuid((uid_t)i)) != NULL) 99 output(passwd, &last); 100 } 101 if (ferror(fp)) 102 warnx("fread error"); 103 } 104 105 setpassent(0); /* Close passwd file pointers */ 106 107 fclose(fp); 108 exit(0); 109 } 110 111 /* Duplicate the output of last(1) */ 112 static void 113 output(struct passwd *p, struct lastlog *l) 114 { 115 printf("%-*.*s %-*.*s %-*.*s %s", 116 UT_NAMESIZE, UT_NAMESIZE, p->pw_name, 117 UT_LINESIZE, UT_LINESIZE, l->ll_line, 118 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host, 119 (l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n"); 120 } 121 122 static void 123 usage(void) 124 { 125 fprintf(stderr, "usage: lastlogin [user ...]\n"); 126 exit(1); 127 } 128