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 1.3 2003/11/03 19:31:38 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(argc, argv) 55 int argc; 56 char *argv[]; 57 { 58 int ch, i; 59 FILE *fp; 60 struct passwd *passwd; 61 struct lastlog last; 62 63 while ((ch = getopt(argc, argv, "")) != -1) { 64 usage(); 65 } 66 67 fp = fopen(logfile, "r"); 68 if (fp == NULL) 69 err(1, "%s", logfile); 70 71 setpassent(1); /* Keep passwd file pointers open */ 72 73 /* Process usernames given on the command line. */ 74 if (argc > 1) { 75 long offset; 76 for (i = 1; i < argc; ++i) { 77 if ((passwd = getpwnam(argv[i])) == NULL) { 78 warnx("user '%s' not found", argv[i]); 79 continue; 80 } 81 /* Calculate the offset into the lastlog file. */ 82 offset = (long)(passwd->pw_uid * sizeof(last)); 83 if (fseek(fp, offset, SEEK_SET)) { 84 warn("fseek error"); 85 continue; 86 } 87 if (fread(&last, sizeof(last), 1, fp) != 1) { 88 warnx("fread error on '%s'", passwd->pw_name); 89 clearerr(fp); 90 continue; 91 } 92 output(passwd, &last); 93 } 94 } 95 /* Read all lastlog entries, looking for active ones */ 96 else { 97 for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) { 98 if (last.ll_time == 0) 99 continue; 100 if ((passwd = getpwuid((uid_t)i)) != NULL) 101 output(passwd, &last); 102 } 103 if (ferror(fp)) 104 warnx("fread error"); 105 } 106 107 setpassent(0); /* Close passwd file pointers */ 108 109 fclose(fp); 110 exit(0); 111 } 112 113 /* Duplicate the output of last(1) */ 114 static void 115 output(p, l) 116 struct passwd *p; 117 struct lastlog *l; 118 { 119 printf("%-*.*s %-*.*s %-*.*s %s", 120 UT_NAMESIZE, UT_NAMESIZE, p->pw_name, 121 UT_LINESIZE, UT_LINESIZE, l->ll_line, 122 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host, 123 (l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n"); 124 } 125 126 static void 127 usage() 128 { 129 fprintf(stderr, "usage: lastlogin [user ...]\n"); 130 exit(1); 131 } 132