1 /* $NetBSD: who.c,v 1.8 1999/07/17 16:41:44 christos 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 #include <sys/cdefs.h> 40 #ifndef lint 41 __COPYRIGHT( 42 "@(#) Copyright (c) 1989, 1993\n\ 43 The Regents of the University of California. All rights reserved.\n"); 44 #endif /* not lint */ 45 46 #ifndef lint 47 #if 0 48 static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93"; 49 #endif 50 __RCSID("$NetBSD: who.c,v 1.8 1999/07/17 16:41:44 christos Exp $"); 51 #endif /* not lint */ 52 53 #include <sys/types.h> 54 #include <sys/stat.h> 55 #include <err.h> 56 #include <locale.h> 57 #include <pwd.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <time.h> 62 #include <unistd.h> 63 #include <utmp.h> 64 65 void output __P((struct utmp *)); 66 void output_labels __P((void)); 67 void who_am_i __P((FILE *)); 68 FILE *file __P((char *)); 69 void usage __P((void)); 70 71 int show_term; /* show term state */ 72 int show_idle; /* show idle time */ 73 74 int main __P((int, char **)); 75 76 int 77 main(argc, argv) 78 int argc; 79 char **argv; 80 { 81 struct utmp usr; 82 FILE *ufp; 83 int c, only_current_term, show_labels; 84 85 setlocale(LC_ALL, ""); 86 87 only_current_term = show_term = show_idle = show_labels = 0; 88 while ((c = getopt(argc, argv, "mTuH")) != -1) { 89 switch (c) { 90 case 'm': 91 only_current_term = 1; 92 break; 93 case 'T': 94 show_term = 1; 95 break; 96 case 'u': 97 show_idle = 1; 98 break; 99 case 'H': 100 show_labels = 1; 101 break; 102 default: 103 usage(); 104 /* NOTREACHED */ 105 } 106 } 107 argc -= optind; 108 argv += optind; 109 110 if (chdir("/dev")) { 111 err(1, "cannot change directory to /dev"); 112 /* NOTREACHED */ 113 } 114 115 if (show_labels) 116 output_labels(); 117 118 switch (argc) { 119 case 0: /* who */ 120 ufp = file(_PATH_UTMP); 121 122 if (only_current_term) { 123 who_am_i(ufp); 124 } else { 125 /* only entries with both name and line fields */ 126 while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) 127 if (*usr.ut_name && *usr.ut_line) 128 output(&usr); 129 } 130 break; 131 case 1: /* who utmp_file */ 132 ufp = file(*argv); 133 134 if (only_current_term) { 135 who_am_i(ufp); 136 } else { 137 /* all entries */ 138 while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) 139 output(&usr); 140 } 141 break; 142 case 2: /* who am i */ 143 ufp = file(_PATH_UTMP); 144 who_am_i(ufp); 145 break; 146 default: 147 usage(); 148 /* NOTREACHED */ 149 } 150 exit(0); 151 } 152 153 void 154 who_am_i(ufp) 155 FILE *ufp; 156 { 157 struct utmp usr; 158 struct passwd *pw; 159 char *p; 160 char *t; 161 162 /* search through the utmp and find an entry for this tty */ 163 if ((p = ttyname(0)) != NULL) { 164 /* strip any directory component */ 165 if ((t = strrchr(p, '/')) != NULL) 166 p = t + 1; 167 while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) 168 if (usr.ut_name[0] != '\0' && 169 !strcmp(usr.ut_line, p)) { 170 output(&usr); 171 return; 172 } 173 /* well, at least we know what the tty is */ 174 (void)strncpy(usr.ut_line, p, UT_LINESIZE); 175 } else 176 (void)strcpy(usr.ut_line, "tty??"); 177 178 pw = getpwuid(getuid()); 179 (void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE); 180 (void)time(&usr.ut_time); 181 *usr.ut_host = '\0'; 182 output(&usr); 183 } 184 185 void 186 output(up) 187 struct utmp *up; 188 { 189 struct stat sb; 190 char line[sizeof (up->ut_line) + 1]; 191 char state; 192 static time_t now = 0; 193 time_t idle; 194 195 state = '?'; 196 idle = 0; 197 198 if (show_term || show_idle) { 199 if (now == 0) 200 time(&now); 201 202 strncpy(line, up->ut_line, sizeof (up->ut_line)); 203 line[sizeof (up->ut_line)] = '\0'; 204 205 if (stat(line, &sb) == 0) { 206 state = (sb.st_mode & 020) ? '+' : '-'; 207 idle = now - sb.st_atime; 208 } 209 210 } 211 212 (void)printf("%-*.*s ", (int)UT_NAMESIZE, (int)UT_NAMESIZE, up->ut_name); 213 214 if (show_term) { 215 (void)printf("%c ", state); 216 } 217 218 (void)printf("%-*.*s ", (int)UT_LINESIZE, (int)UT_LINESIZE, up->ut_line); 219 (void)printf("%.12s ", ctime(&up->ut_time) + 4); 220 221 if (show_idle) { 222 if (idle < 60) 223 (void)printf(" . "); 224 else if (idle < (24 * 60 * 60)) 225 (void)printf("%02ld:%02ld ", 226 (long)(idle / (60 * 60)), 227 (long)(idle % (60 * 60)) / 60); 228 else 229 (void)printf(" old "); 230 } 231 232 if (*up->ut_host) 233 printf("\t(%.*s)", (int)UT_HOSTSIZE, up->ut_host); 234 (void)putchar('\n'); 235 } 236 237 void 238 output_labels() 239 { 240 (void)printf("%-*.*s ", (int)UT_NAMESIZE, (int)UT_NAMESIZE, "USER"); 241 242 if (show_term) 243 (void)printf("S "); 244 245 (void)printf("%-*.*s ", (int)UT_LINESIZE, (int)UT_LINESIZE, "LINE"); 246 (void)printf("WHEN "); 247 248 if (show_idle) 249 (void)printf("IDLE "); 250 251 (void)printf("\t%.*s", (int)UT_HOSTSIZE, "FROM"); 252 253 (void)putchar('\n'); 254 } 255 256 FILE * 257 file(name) 258 char *name; 259 { 260 FILE *ufp; 261 262 if (!(ufp = fopen(name, "r"))) { 263 err(1, "%s", name); 264 /* NOTREACHED */ 265 } 266 return (ufp); 267 } 268 269 void 270 usage() 271 { 272 (void)fprintf(stderr, "usage: who [-mTuH] [ file ]\n who am i\n"); 273 exit(1); 274 } 275