1 /*- 2 * Copyright (c) 1980, 1991, 1993, 1994 3 * The Regents of the University of California. 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 by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)w.c 8.4 (Berkeley) 4/16/94 35 * $FreeBSD: src/usr.bin/w/w.c,v 1.38.2.6 2002/03/12 19:51:51 phantom Exp $ 36 * $DragonFly: src/usr.bin/w/w.c,v 1.7 2005/03/25 14:15:23 liamfoy Exp $ 37 */ 38 39 /* 40 * w - print system status (who and what) 41 * 42 * This program is similar to the systat command on Tenex/Tops 10/20 43 * 44 */ 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/stat.h> 48 #include <sys/sysctl.h> 49 #include <sys/user.h> 50 #include <sys/ioctl.h> 51 #include <sys/socket.h> 52 #include <sys/tty.h> 53 54 #include <machine/cpu.h> 55 #include <netinet/in.h> 56 #include <arpa/inet.h> 57 58 #include <ctype.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <kvm.h> 63 #include <limits.h> 64 #include <langinfo.h> 65 #include <locale.h> 66 #include <netdb.h> 67 #include <nlist.h> 68 #include <paths.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 #include <unistd.h> 73 #include <utmp.h> 74 #include <vis.h> 75 76 #include <arpa/nameser.h> 77 #include <resolv.h> 78 79 #include "extern.h" 80 81 struct timeval boottime; 82 struct utmp utmp; 83 struct winsize ws; 84 kvm_t *kd; 85 time_t now; /* the current time of day */ 86 time_t uptime; /* time of last reboot & elapsed time since */ 87 int ttywidth; /* width of tty */ 88 int argwidth; /* width of tty */ 89 int header = 1; /* true if -h flag: don't print heading */ 90 int nflag; /* true if -n flag: don't convert addrs */ 91 int dflag; /* true if -d flag: output debug info */ 92 int sortidle; /* sort by idle time */ 93 int use_ampm; /* use AM/PM time */ 94 int use_comma; /* use comma as floats separator */ 95 char **sel_users; /* login array of particular users selected */ 96 char domain[MAXHOSTNAMELEN]; 97 98 /* 99 * One of these per active utmp entry. 100 */ 101 struct entry { 102 struct entry *next; 103 struct utmp utmp; 104 dev_t tdev; /* dev_t of terminal */ 105 time_t idle; /* idle time of terminal in seconds */ 106 struct kinfo_proc *kp; /* `most interesting' proc */ 107 char *args; /* arg list of interesting process */ 108 struct kinfo_proc *dkp; /* debug option proc list */ 109 } *ep, *ehead = NULL, **nextp = &ehead; 110 111 #define debugproc(p) *((struct kinfo_proc **)&(p)->kp_eproc.e_spare[0]) 112 113 static void pr_header(time_t *, int); 114 static struct stat *ttystat(char *, int); 115 static void usage(int); 116 static int this_is_uptime(const char *s); 117 118 char *fmt_argv(char **, char *, int); /* ../../bin/ps/fmt.c */ 119 120 int 121 main(int argc, char **argv) 122 { 123 struct kinfo_proc *kp; 124 struct kinfo_proc *dkp; 125 struct hostent *hp; 126 struct stat *stp; 127 FILE *ut; 128 in_addr_t l; 129 time_t touched; 130 int ch, i, nentries, nusers, wcmd, longidle, dropgid; 131 char *memf, *nlistf, *p, *x; 132 char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX]; 133 134 (void)setlocale(LC_ALL, ""); 135 use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0'); 136 use_comma = (*nl_langinfo(RADIXCHAR) != ','); 137 138 /* Are we w(1) or uptime(1)? */ 139 if (this_is_uptime(argv[0]) == 0) { 140 wcmd = 0; 141 p = ""; 142 } else { 143 wcmd = 1; 144 p = "dhiflM:N:nsuw"; 145 } 146 147 dropgid = 0; 148 memf = nlistf = _PATH_DEVNULL; 149 while ((ch = getopt(argc, argv, p)) != -1) 150 switch (ch) { 151 case 'd': 152 dflag = 1; 153 break; 154 case 'h': 155 header = 0; 156 break; 157 case 'i': 158 sortidle = 1; 159 break; 160 case 'M': 161 header = 0; 162 memf = optarg; 163 dropgid = 1; 164 break; 165 case 'N': 166 nlistf = optarg; 167 dropgid = 1; 168 break; 169 case 'n': 170 nflag = 1; 171 break; 172 case 'f': case 'l': case 's': case 'u': case 'w': 173 warnx("[-flsuw] no longer supported"); 174 /* FALLTHROUGH */ 175 case '?': 176 default: 177 usage(wcmd); 178 } 179 argc -= optind; 180 argv += optind; 181 182 if (!(_res.options & RES_INIT)) 183 res_init(); 184 _res.retrans = 2; /* resolver timeout to 2 seconds per try */ 185 _res.retry = 1; /* only try once.. */ 186 187 /* 188 * Discard setgid privileges if not the running kernel so that bad 189 * guys can't print interesting stuff from kernel memory. 190 */ 191 if (dropgid) 192 setgid(getgid()); 193 194 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 195 errx(1, "%s", errbuf); 196 197 (void)time(&now); 198 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 199 err(1, "%s", _PATH_UTMP); 200 201 if (*argv) 202 sel_users = argv; 203 204 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 205 if (utmp.ut_name[0] == '\0') 206 continue; 207 if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE))) 208 continue; /* corrupted record */ 209 ++nusers; 210 if (wcmd == 0) 211 continue; 212 if (sel_users) { 213 int usermatch; 214 char **user; 215 216 usermatch = 0; 217 for (user = sel_users; !usermatch && *user; user++) 218 if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE)) 219 usermatch = 1; 220 if (!usermatch) 221 continue; 222 } 223 if ((ep = calloc(1, sizeof(struct entry))) == NULL) 224 errx(1, "calloc"); 225 *nextp = ep; 226 nextp = &ep->next; 227 memmove(&ep->utmp, &utmp, sizeof(struct utmp)); 228 ep->tdev = stp->st_rdev; 229 #ifdef CPU_CONSDEV 230 /* 231 * If this is the console device, attempt to ascertain 232 * the true console device dev_t. 233 */ 234 if (ep->tdev == 0) { 235 int mib[2]; 236 size_t size; 237 238 mib[0] = CTL_MACHDEP; 239 mib[1] = CPU_CONSDEV; 240 size = sizeof(dev_t); 241 (void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 242 } 243 #endif 244 touched = stp->st_atime; 245 if (touched < ep->utmp.ut_time) { 246 /* tty untouched since before login */ 247 touched = ep->utmp.ut_time; 248 } 249 if ((ep->idle = now - touched) < 0) 250 ep->idle = 0; 251 } 252 (void)fclose(ut); 253 254 if (header || wcmd == 0) { 255 pr_header(&now, nusers); 256 if (wcmd == 0) { 257 (void)kvm_close(kd); 258 exit(0); 259 } 260 261 #define HEADER_USER "USER" 262 #define HEADER_TTY "TTY" 263 #define HEADER_FROM "FROM" 264 #define HEADER_LOGIN_IDLE "LOGIN@ IDLE " 265 #define HEADER_WHAT "WHAT\n" 266 #define WUSED (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \ 267 sizeof(HEADER_LOGIN_IDLE) + 3) /* header width incl. spaces */ 268 (void)printf("%-*.*s %-*.*s %-*.*s %s", 269 UT_NAMESIZE, UT_NAMESIZE, HEADER_USER, 270 UT_LINESIZE, UT_LINESIZE, HEADER_TTY, 271 UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM, 272 HEADER_LOGIN_IDLE HEADER_WHAT); 273 } 274 275 if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL) 276 err(1, "%s", kvm_geterr(kd)); 277 for (i = 0; i < nentries; i++, kp++) { 278 struct proc *pr = &kp->kp_proc; 279 struct eproc *e; 280 281 if (pr->p_stat == SIDL || pr->p_stat == SZOMB) 282 continue; 283 e = &kp->kp_eproc; 284 for (ep = ehead; ep != NULL; ep = ep->next) { 285 if (ep->tdev == e->e_tdev) { 286 /* 287 * proc is associated with this terminal 288 */ 289 if (ep->kp == NULL && e->e_pgid == e->e_tpgid) { 290 /* 291 * Proc is 'most interesting' 292 */ 293 if (proc_compare(&ep->kp->kp_proc, pr)) 294 ep->kp = kp; 295 } 296 /* 297 * Proc debug option info; add to debug 298 * list using kinfo_proc kp_eproc.e_spare 299 * as next pointer; ptr to ptr avoids the 300 * ptr = long assumption. 301 */ 302 dkp = ep->dkp; 303 ep->dkp = kp; 304 debugproc(kp) = dkp; 305 } 306 } 307 } 308 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 309 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 310 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 311 ttywidth = 79; 312 else 313 ttywidth = ws.ws_col - 1; 314 argwidth = ttywidth - WUSED; 315 if (argwidth < 4) 316 argwidth = 8; 317 for (ep = ehead; ep != NULL; ep = ep->next) { 318 if (ep->kp == NULL) { 319 ep->args = "-"; 320 continue; 321 } 322 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth), 323 ep->kp->kp_thread.td_comm, MAXCOMLEN); 324 if (ep->args == NULL) 325 err(1, NULL); 326 } 327 /* sort by idle time */ 328 if (sortidle && ehead != NULL) { 329 struct entry *from, *save; 330 331 from = ehead; 332 ehead = NULL; 333 while (from != NULL) { 334 for (nextp = &ehead; 335 (*nextp) && from->idle >= (*nextp)->idle; 336 nextp = &(*nextp)->next) 337 continue; 338 save = from; 339 from = from->next; 340 save->next = *nextp; 341 *nextp = save; 342 } 343 } 344 345 if (!nflag) { 346 if (gethostname(domain, sizeof(domain)) < 0 || 347 (p = strchr(domain, '.')) == NULL) 348 domain[0] = '\0'; 349 else { 350 domain[sizeof(domain) - 1] = '\0'; 351 memmove(domain, p, strlen(p) + 1); 352 } 353 } 354 355 for (ep = ehead; ep != NULL; ep = ep->next) { 356 char host_buf[UT_HOSTSIZE + 1]; 357 358 host_buf[UT_HOSTSIZE] = '\0'; 359 strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE); 360 p = *host_buf ? host_buf : "-"; 361 if ((x = strchr(p, ':')) != NULL) 362 *x++ = '\0'; 363 if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 && 364 (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) { 365 if (domain[0] != '\0') { 366 p = hp->h_name; 367 p += strlen(hp->h_name); 368 p -= strlen(domain); 369 if (p > hp->h_name && 370 strcasecmp(p, domain) == 0) 371 *p = '\0'; 372 } 373 p = hp->h_name; 374 } 375 if (nflag && *p && strcmp(p, "-") && 376 inet_addr(p) == INADDR_NONE) { 377 hp = gethostbyname(p); 378 379 if (hp != NULL) { 380 struct in_addr in; 381 382 memmove(&in, hp->h_addr, sizeof(in)); 383 p = inet_ntoa(in); 384 } 385 } 386 if (x) { 387 (void)snprintf(buf, sizeof(buf), "%s:%s", p, x); 388 p = buf; 389 } 390 if (dflag) { 391 for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) { 392 char *ptr; 393 394 ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth), 395 dkp->kp_thread.td_comm, MAXCOMLEN); 396 if (ptr == NULL) 397 ptr = "-"; 398 (void)printf("\t\t%-9d %s\n", 399 dkp->kp_proc.p_pid, ptr); 400 } 401 } 402 (void)printf("%-*.*s %-*.*s %-*.*s ", 403 UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name, 404 UT_LINESIZE, UT_LINESIZE, 405 strncmp(ep->utmp.ut_line, "tty", 3) && 406 strncmp(ep->utmp.ut_line, "cua", 3) ? 407 ep->utmp.ut_line : ep->utmp.ut_line + 3, 408 UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-"); 409 pr_attime(&ep->utmp.ut_time, &now); 410 longidle = pr_idle(ep->idle); 411 (void)printf("%.*s\n", argwidth - longidle, ep->args); 412 } 413 (void)kvm_close(kd); 414 exit(0); 415 } 416 417 static void 418 pr_header(time_t *nowp, int nusers) 419 { 420 double avenrun[3]; 421 time_t uptime; 422 int days, hrs, i, mins, secs; 423 int mib[2]; 424 size_t size; 425 char buf[256]; 426 427 /* 428 * Print time of day. 429 */ 430 (void)strftime(buf, sizeof(buf) - 1, 431 use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)); 432 buf[sizeof(buf) - 1] = '\0'; 433 (void)printf("%s ", buf); 434 435 /* 436 * Print how long system has been up. 437 * (Found by looking at "boottime" from the kernel) 438 */ 439 mib[0] = CTL_KERN; 440 mib[1] = KERN_BOOTTIME; 441 size = sizeof(boottime); 442 if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 && 443 boottime.tv_sec != 0) { 444 uptime = now - boottime.tv_sec; 445 if (uptime > 60) 446 uptime += 30; 447 days = uptime / 86400; 448 uptime %= 86400; 449 hrs = uptime / 3600; 450 uptime %= 3600; 451 mins = uptime / 60; 452 secs = uptime % 60; 453 (void)printf(" up"); 454 if (days > 0) 455 (void)printf(" %d day%s,", days, days > 1 ? "s" : ""); 456 if (hrs > 0 && mins > 0) 457 (void)printf(" %2d:%02d,", hrs, mins); 458 else if (hrs > 0) 459 (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : ""); 460 else if (mins > 0) 461 (void)printf(" %d min%s,", mins, mins > 1 ? "s" : ""); 462 else 463 (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : ""); 464 } 465 466 /* Print number of users logged in on system */ 467 (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s"); 468 469 /* 470 * Print 1, 5, and 15 minute load averages. 471 */ 472 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) 473 (void)printf(", no load average information available\n"); 474 else { 475 (void)printf(", load averages:"); 476 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { 477 if (use_comma && i > 0) 478 (void)printf(","); 479 (void)printf(" %.2f", avenrun[i]); 480 } 481 (void)printf("\n"); 482 } 483 } 484 485 static struct stat * 486 ttystat(char *line, int sz) 487 { 488 static struct stat sb; 489 char ttybuf[MAXPATHLEN]; 490 491 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line); 492 if (stat(ttybuf, &sb)) { 493 warn("%s", ttybuf); 494 return (NULL); 495 } 496 return (&sb); 497 } 498 499 static void 500 usage(int wcmd) 501 { 502 if (wcmd) 503 (void)fprintf(stderr, 504 "usage: w [-dhin] [-M core] [-N system] [user ...]\n"); 505 else 506 (void)fprintf(stderr, "usage: uptime\n"); 507 exit(1); 508 } 509 510 static int 511 this_is_uptime(const char *s) 512 { 513 const char *u; 514 515 if ((u = strrchr(s, '/')) != NULL) 516 ++u; 517 else 518 u = s; 519 if (strcmp(u, "uptime") == 0) 520 return (0); 521 return (-1); 522 } 523