1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002 Tim J. Robbins. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/types.h> 32 #include <sys/ioctl.h> 33 #include <sys/stat.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <langinfo.h> 38 #include <limits.h> 39 #include <locale.h> 40 #include <paths.h> 41 #include <pwd.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <time.h> 46 #include <timeconv.h> 47 #include <unistd.h> 48 #include <utmpx.h> 49 50 static void heading(void); 51 static void process_utmp(void); 52 static void quick(void); 53 static void row(const struct utmpx *); 54 static int ttywidth(void); 55 static void usage(void); 56 static void whoami(void); 57 58 static int Hflag; /* Write column headings */ 59 static int aflag; /* Print all entries */ 60 static int bflag; /* Show date of the last reboot */ 61 static int mflag; /* Show info about current terminal */ 62 static int qflag; /* "Quick" mode */ 63 static int sflag; /* Show name, line, time */ 64 static int Tflag; /* Show terminal state */ 65 static int uflag; /* Show idle time */ 66 67 int 68 main(int argc, char *argv[]) 69 { 70 int ch; 71 72 setlocale(LC_TIME, ""); 73 74 while ((ch = getopt(argc, argv, "HTabmqsu")) != -1) { 75 switch (ch) { 76 case 'H': /* Write column headings */ 77 Hflag = 1; 78 break; 79 case 'T': /* Show terminal state */ 80 Tflag = 1; 81 break; 82 case 'a': /* Same as -bdlprtTu */ 83 aflag = bflag = Tflag = uflag = 1; 84 break; 85 case 'b': /* Show date of the last reboot */ 86 bflag = 1; 87 break; 88 case 'm': /* Show info about current terminal */ 89 mflag = 1; 90 break; 91 case 'q': /* "Quick" mode */ 92 qflag = 1; 93 break; 94 case 's': /* Show name, line, time */ 95 sflag = 1; 96 break; 97 case 'u': /* Show idle time */ 98 uflag = 1; 99 break; 100 default: 101 usage(); 102 /*NOTREACHED*/ 103 } 104 } 105 argc -= optind; 106 argv += optind; 107 108 if (argc >= 2 && strcmp(argv[0], "am") == 0 && 109 (strcmp(argv[1], "i") == 0 || strcmp(argv[1], "I") == 0)) { 110 /* "who am i" or "who am I", equivalent to -m */ 111 mflag = 1; 112 argc -= 2; 113 argv += 2; 114 } 115 if (argc > 1) 116 usage(); 117 118 if (*argv != NULL) { 119 if (setutxdb(UTXDB_ACTIVE, *argv) != 0) 120 err(1, "%s", *argv); 121 } 122 123 if (qflag) 124 quick(); 125 else { 126 if (sflag) 127 Tflag = uflag = 0; 128 if (Hflag) 129 heading(); 130 if (mflag) 131 whoami(); 132 else 133 process_utmp(); 134 } 135 136 endutxent(); 137 138 exit(0); 139 } 140 141 static void 142 usage(void) 143 { 144 145 fprintf(stderr, "usage: who [-abHmqsTu] [am I] [file]\n"); 146 exit(1); 147 } 148 149 static void 150 heading(void) 151 { 152 153 printf("%-16s ", "NAME"); 154 if (Tflag) 155 printf("S "); 156 printf("%-12s %-12s ", "LINE", "TIME"); 157 if (uflag) 158 printf("IDLE "); 159 printf("%-16s\n", "FROM"); 160 } 161 162 static void 163 row(const struct utmpx *ut) 164 { 165 char buf[80], tty[PATH_MAX]; 166 struct stat sb; 167 time_t idle, t; 168 static int d_first = -1; 169 struct tm *tm; 170 char state; 171 172 if (d_first < 0) 173 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 174 175 state = '?'; 176 idle = 0; 177 if (Tflag || uflag) { 178 snprintf(tty, sizeof(tty), "%s%s", _PATH_DEV, ut->ut_line); 179 if (stat(tty, &sb) == 0) { 180 state = sb.st_mode & (S_IWOTH|S_IWGRP) ? 181 '+' : '-'; 182 idle = time(NULL) - sb.st_mtime; 183 } 184 } 185 186 printf("%-16s ", ut->ut_user); 187 if (Tflag) 188 printf("%c ", state); 189 if (ut->ut_type == BOOT_TIME) 190 printf("%-12s ", "system boot"); 191 else 192 printf("%-12s ", ut->ut_line); 193 t = ut->ut_tv.tv_sec; 194 tm = localtime(&t); 195 strftime(buf, sizeof(buf), d_first ? "%e %b %R" : "%b %e %R", tm); 196 printf("%-*s ", 12, buf); 197 if (uflag) { 198 if (idle < 60) 199 printf(" . "); 200 else if (idle < 24 * 60 * 60) 201 printf("%02d:%02d ", (int)(idle / 60 / 60), 202 (int)(idle / 60 % 60)); 203 else 204 printf(" old "); 205 } 206 if (*ut->ut_host != '\0') 207 printf("(%s)", ut->ut_host); 208 putchar('\n'); 209 } 210 211 static int 212 ttystat(char *line) 213 { 214 struct stat sb; 215 char ttybuf[MAXPATHLEN]; 216 217 if (line == NULL) 218 return (0); 219 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); 220 if (stat(ttybuf, &sb) == 0) { 221 return (0); 222 } else 223 return (-1); 224 } 225 226 static void 227 process_utmp(void) 228 { 229 struct utmpx *utx; 230 231 while ((utx = getutxent()) != NULL) { 232 if ((aflag || !bflag) && utx->ut_type == USER_PROCESS) { 233 if (ttystat(utx->ut_line) == 0) 234 row(utx); 235 } else if (bflag && utx->ut_type == BOOT_TIME) 236 row(utx); 237 } 238 } 239 240 static void 241 quick(void) 242 { 243 struct utmpx *utx; 244 int col, ncols, num; 245 246 ncols = ttywidth(); 247 col = num = 0; 248 while ((utx = getutxent()) != NULL) { 249 if (utx->ut_type != USER_PROCESS) 250 continue; 251 printf("%-16s", utx->ut_user); 252 if (++col < ncols / (16 + 1)) 253 putchar(' '); 254 else { 255 col = 0; 256 putchar('\n'); 257 } 258 num++; 259 } 260 if (col != 0) 261 putchar('\n'); 262 263 printf("# users = %d\n", num); 264 } 265 266 static void 267 whoami(void) 268 { 269 struct utmpx ut, *utx; 270 struct passwd *pwd; 271 const char *name, *tty; 272 273 if ((tty = ttyname(STDIN_FILENO)) == NULL) 274 tty = "tty??"; 275 else if (strncmp(tty, _PATH_DEV, sizeof _PATH_DEV - 1) == 0) 276 tty += sizeof _PATH_DEV - 1; 277 strlcpy(ut.ut_line, tty, sizeof ut.ut_line); 278 279 /* Search utmp for our tty, dump first matching record. */ 280 if ((utx = getutxline(&ut)) != NULL && utx->ut_type == USER_PROCESS) { 281 row(utx); 282 return; 283 } 284 285 /* Not found; fill the utmp structure with the information we have. */ 286 memset(&ut, 0, sizeof(ut)); 287 if ((pwd = getpwuid(getuid())) != NULL) 288 name = pwd->pw_name; 289 else 290 name = "?"; 291 strlcpy(ut.ut_user, name, sizeof ut.ut_user); 292 gettimeofday(&ut.ut_tv, NULL); 293 row(&ut); 294 } 295 296 static int 297 ttywidth(void) 298 { 299 struct winsize ws; 300 long width; 301 char *cols, *ep; 302 303 if ((cols = getenv("COLUMNS")) != NULL && *cols != '\0') { 304 errno = 0; 305 width = strtol(cols, &ep, 10); 306 if (errno || width <= 0 || width > INT_MAX || ep == cols || 307 *ep != '\0') 308 warnx("invalid COLUMNS environment variable ignored"); 309 else 310 return (width); 311 } 312 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) 313 return (ws.ws_col); 314 315 return (80); 316 } 317