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/param.h> 30 #include <sys/types.h> 31 #include <sys/ioctl.h> 32 #include <sys/stat.h> 33 34 #include <err.h> 35 #include <errno.h> 36 #include <langinfo.h> 37 #include <limits.h> 38 #include <locale.h> 39 #include <paths.h> 40 #include <pwd.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <time.h> 45 #include <timeconv.h> 46 #include <unistd.h> 47 #include <utmpx.h> 48 49 static void heading(void); 50 static void process_utmp(void); 51 static void quick(void); 52 static void row(const struct utmpx *); 53 static int ttywidth(void); 54 static void usage(void); 55 static void whoami(void); 56 57 static int Hflag; /* Write column headings */ 58 static int aflag; /* Print all entries */ 59 static int bflag; /* Show date of the last reboot */ 60 static int mflag; /* Show info about current terminal */ 61 static int qflag; /* "Quick" mode */ 62 static int sflag; /* Show name, line, time */ 63 static int Tflag; /* Show terminal state */ 64 static int uflag; /* Show idle time */ 65 66 int 67 main(int argc, char *argv[]) 68 { 69 int ch; 70 71 setlocale(LC_TIME, ""); 72 73 while ((ch = getopt(argc, argv, "HTabmqsu")) != -1) { 74 switch (ch) { 75 case 'H': /* Write column headings */ 76 Hflag = 1; 77 break; 78 case 'T': /* Show terminal state */ 79 Tflag = 1; 80 break; 81 case 'a': /* Same as -bdlprtTu */ 82 aflag = bflag = Tflag = uflag = 1; 83 break; 84 case 'b': /* Show date of the last reboot */ 85 bflag = 1; 86 break; 87 case 'm': /* Show info about current terminal */ 88 mflag = 1; 89 break; 90 case 'q': /* "Quick" mode */ 91 qflag = 1; 92 break; 93 case 's': /* Show name, line, time */ 94 sflag = 1; 95 break; 96 case 'u': /* Show idle time */ 97 uflag = 1; 98 break; 99 default: 100 usage(); 101 /*NOTREACHED*/ 102 } 103 } 104 argc -= optind; 105 argv += optind; 106 107 if (argc >= 2 && strcmp(argv[0], "am") == 0 && 108 (strcmp(argv[1], "i") == 0 || strcmp(argv[1], "I") == 0)) { 109 /* "who am i" or "who am I", equivalent to -m */ 110 mflag = 1; 111 argc -= 2; 112 argv += 2; 113 } 114 if (argc > 1) 115 usage(); 116 117 if (*argv != NULL) { 118 if (setutxdb(UTXDB_ACTIVE, *argv) != 0) 119 err(1, "%s", *argv); 120 } 121 122 if (qflag) 123 quick(); 124 else { 125 if (sflag) 126 Tflag = uflag = 0; 127 if (Hflag) 128 heading(); 129 if (mflag) 130 whoami(); 131 else 132 process_utmp(); 133 } 134 135 endutxent(); 136 137 exit(0); 138 } 139 140 static void 141 usage(void) 142 { 143 144 fprintf(stderr, "usage: who [-abHmqsTu] [am I] [file]\n"); 145 exit(1); 146 } 147 148 static void 149 heading(void) 150 { 151 152 printf("%-16s ", "NAME"); 153 if (Tflag) 154 printf("S "); 155 printf("%-12s %-12s ", "LINE", "TIME"); 156 if (uflag) 157 printf("IDLE "); 158 printf("%-16s\n", "FROM"); 159 } 160 161 static void 162 row(const struct utmpx *ut) 163 { 164 char buf[80], tty[PATH_MAX]; 165 struct stat sb; 166 time_t idle, t; 167 static int d_first = -1; 168 struct tm *tm; 169 char state; 170 171 if (d_first < 0) 172 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 173 174 state = '?'; 175 idle = 0; 176 if (Tflag || uflag) { 177 snprintf(tty, sizeof(tty), "%s%s", _PATH_DEV, ut->ut_line); 178 if (stat(tty, &sb) == 0) { 179 state = sb.st_mode & (S_IWOTH|S_IWGRP) ? 180 '+' : '-'; 181 idle = time(NULL) - sb.st_mtime; 182 } 183 } 184 185 printf("%-16s ", ut->ut_user); 186 if (Tflag) 187 printf("%c ", state); 188 if (ut->ut_type == BOOT_TIME) 189 printf("%-12s ", "system boot"); 190 else 191 printf("%-12s ", ut->ut_line); 192 t = ut->ut_tv.tv_sec; 193 tm = localtime(&t); 194 strftime(buf, sizeof(buf), d_first ? "%e %b %R" : "%b %e %R", tm); 195 printf("%-*s ", 12, buf); 196 if (uflag) { 197 if (idle < 60) 198 printf(" . "); 199 else if (idle < 24 * 60 * 60) 200 printf("%02d:%02d ", (int)(idle / 60 / 60), 201 (int)(idle / 60 % 60)); 202 else 203 printf(" old "); 204 } 205 if (*ut->ut_host != '\0') 206 printf("(%s)", ut->ut_host); 207 putchar('\n'); 208 } 209 210 static int 211 ttystat(char *line) 212 { 213 struct stat sb; 214 char ttybuf[MAXPATHLEN]; 215 216 if (line == NULL) 217 return (0); 218 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line); 219 if (stat(ttybuf, &sb) == 0) { 220 return (0); 221 } else 222 return (-1); 223 } 224 225 static void 226 process_utmp(void) 227 { 228 struct utmpx *utx; 229 230 while ((utx = getutxent()) != NULL) { 231 if ((aflag || !bflag) && utx->ut_type == USER_PROCESS) { 232 if (ttystat(utx->ut_line) == 0) 233 row(utx); 234 } else if (bflag && utx->ut_type == BOOT_TIME) 235 row(utx); 236 } 237 } 238 239 static void 240 quick(void) 241 { 242 struct utmpx *utx; 243 int col, ncols, num; 244 245 ncols = ttywidth(); 246 col = num = 0; 247 while ((utx = getutxent()) != NULL) { 248 if (utx->ut_type != USER_PROCESS) 249 continue; 250 printf("%-16s", utx->ut_user); 251 if (++col < ncols / (16 + 1)) 252 putchar(' '); 253 else { 254 col = 0; 255 putchar('\n'); 256 } 257 num++; 258 } 259 if (col != 0) 260 putchar('\n'); 261 262 printf("# users = %d\n", num); 263 } 264 265 static void 266 whoami(void) 267 { 268 struct utmpx ut, *utx; 269 struct passwd *pwd; 270 const char *name, *tty; 271 272 if ((tty = ttyname(STDIN_FILENO)) == NULL) 273 tty = "tty??"; 274 else if (strncmp(tty, _PATH_DEV, sizeof _PATH_DEV - 1) == 0) 275 tty += sizeof _PATH_DEV - 1; 276 strlcpy(ut.ut_line, tty, sizeof ut.ut_line); 277 278 /* Search utmp for our tty, dump first matching record. */ 279 if ((utx = getutxline(&ut)) != NULL && utx->ut_type == USER_PROCESS) { 280 row(utx); 281 return; 282 } 283 284 /* Not found; fill the utmp structure with the information we have. */ 285 memset(&ut, 0, sizeof(ut)); 286 if ((pwd = getpwuid(getuid())) != NULL) 287 name = pwd->pw_name; 288 else 289 name = "?"; 290 strlcpy(ut.ut_user, name, sizeof ut.ut_user); 291 gettimeofday(&ut.ut_tv, NULL); 292 row(&ut); 293 } 294 295 static int 296 ttywidth(void) 297 { 298 struct winsize ws; 299 long width; 300 char *cols, *ep; 301 302 if ((cols = getenv("COLUMNS")) != NULL && *cols != '\0') { 303 errno = 0; 304 width = strtol(cols, &ep, 10); 305 if (errno || width <= 0 || width > INT_MAX || ep == cols || 306 *ep != '\0') 307 warnx("invalid COLUMNS environment variable ignored"); 308 else 309 return (width); 310 } 311 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) 312 return (ws.ws_col); 313 314 return (80); 315 } 316