1 /* $NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Michael Fischbein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #ifndef lint 40 static char copyright[] = 41 "@(#) Copyright (c) 1989, 1993\n\ 42 The Regents of the University of California. All rights reserved.\n"; 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93"; 48 #endif 49 static char rcsid[] = "$NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $"; 50 #endif /* not lint */ 51 52 #include <sys/types.h> 53 #include <sys/stat.h> 54 #include <pwd.h> 55 #include <utmp.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <stdlib.h> 59 #include <unistd.h> 60 #include <time.h> 61 #include <err.h> 62 63 void output __P((struct utmp *)); 64 void who_am_i __P((FILE *)); 65 void usage __P((void)); 66 int only_current_term; /* show info about the current terminal only */ 67 int show_term; /* show term state */ 68 int show_idle; /* show idle time */ 69 70 int 71 main(argc, argv) 72 int argc; 73 char **argv; 74 { 75 struct utmp usr; 76 FILE *ufp, *file(); 77 int c; 78 79 while ((c = getopt(argc, argv, "mTu")) != -1) { 80 switch (c) { 81 case 'm': 82 only_current_term = 1; 83 break; 84 case 'T': 85 show_term = 1; 86 break; 87 case 'u': 88 show_idle = 1; 89 break; 90 default: 91 usage(); 92 /* NOTREACHED */ 93 } 94 } 95 argc -= optind; 96 argv += optind; 97 98 if (chdir("/dev")) { 99 err(1, "cannot change directory to /dev"); 100 /* NOTREACHED */ 101 } 102 103 switch (argc) { 104 case 0: /* who */ 105 ufp = file(_PATH_UTMP); 106 107 if (only_current_term) { 108 who_am_i(ufp); 109 } else { 110 /* only entries with both name and line fields */ 111 while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) 112 if (*usr.ut_name && *usr.ut_line) 113 output(&usr); 114 } 115 break; 116 case 1: /* who utmp_file */ 117 ufp = file(*argv); 118 119 if (only_current_term) { 120 who_am_i(ufp); 121 } else { 122 /* all entries */ 123 while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) 124 output(&usr); 125 } 126 break; 127 case 2: /* who am i */ 128 ufp = file(_PATH_UTMP); 129 who_am_i(ufp); 130 break; 131 default: 132 usage(); 133 /* NOTREACHED */ 134 } 135 exit(0); 136 } 137 138 void 139 who_am_i(ufp) 140 FILE *ufp; 141 { 142 struct utmp usr; 143 struct passwd *pw; 144 register char *p; 145 char *t; 146 147 /* search through the utmp and find an entry for this tty */ 148 if (p = ttyname(0)) { 149 /* strip any directory component */ 150 if (t = rindex(p, '/')) 151 p = t + 1; 152 while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) 153 if (usr.ut_name && !strcmp(usr.ut_line, p)) { 154 output(&usr); 155 return; 156 } 157 /* well, at least we know what the tty is */ 158 (void)strncpy(usr.ut_line, p, UT_LINESIZE); 159 } else 160 (void)strcpy(usr.ut_line, "tty??"); 161 162 pw = getpwuid(getuid()); 163 (void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE); 164 (void)time(&usr.ut_time); 165 *usr.ut_host = '\0'; 166 output(&usr); 167 } 168 169 void 170 output(up) 171 struct utmp *up; 172 { 173 struct stat sb; 174 char line[sizeof (up->ut_line) + 1]; 175 char state; 176 static time_t now = 0; 177 time_t idle; 178 179 if (show_term || show_idle) { 180 if (now == 0) 181 time(&now); 182 183 strncpy (line, up->ut_line, sizeof (up->ut_line)); 184 line[sizeof (up->ut_line)] = '\0'; 185 186 if (stat(line, &sb) == 0) { 187 state = (sb.st_mode & 020) ? '+' : '-'; 188 idle = now - sb.st_atime; 189 } else { 190 state = '?'; 191 idle = 0; 192 } 193 194 } 195 196 (void)printf("%-*.*s ", UT_NAMESIZE, UT_NAMESIZE, up->ut_name); 197 198 if (show_term) { 199 (void)printf("%c ", state); 200 } 201 202 (void)printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, up->ut_line); 203 (void)printf("%.12s ", ctime(&up->ut_time) + 4); 204 205 if (show_idle) { 206 if (idle < 60) 207 (void)printf(" . "); 208 else if (idle < (24 * 60 * 60)) 209 (void)printf("%02d:%02d ", 210 (idle / (60 * 60)), 211 (idle % (60 * 60)) / 60); 212 else 213 (void)printf(" old "); 214 } 215 216 if (*up->ut_host) 217 printf("\t(%.*s)", UT_HOSTSIZE, up->ut_host); 218 (void)putchar('\n'); 219 } 220 221 FILE * 222 file(name) 223 char *name; 224 { 225 FILE *ufp; 226 227 if (!(ufp = fopen(name, "r"))) { 228 err(1, "%s", name); 229 /* NOTREACHED */ 230 } 231 return(ufp); 232 } 233 234 void 235 usage() 236 { 237 (void)fprintf(stderr, "usage: who [-mTu] [ file ]\n who am i\n"); 238 exit(1); 239 } 240