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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 30 * @(#)w.c 8.4 (Berkeley) 4/16/94 31 * $FreeBSD: src/usr.bin/w/w.c,v 1.38.2.6 2002/03/12 19:51:51 phantom Exp $ 32 */ 33 34 /* 35 * w - print system status (who and what) 36 * 37 * This program is similar to the systat command on Tenex/Tops 10/20 38 * 39 */ 40 #include <sys/user.h> 41 #include <sys/param.h> 42 #include <sys/time.h> 43 #include <sys/stat.h> 44 #include <sys/sysctl.h> 45 #include <sys/ioctl.h> 46 #include <sys/socket.h> 47 #include <sys/tty.h> 48 49 #include <machine/cpu.h> 50 #include <netinet/in.h> 51 #include <arpa/inet.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <fcntl.h> 57 #include <kvm.h> 58 #include <limits.h> 59 #include <langinfo.h> 60 #include <locale.h> 61 #include <netdb.h> 62 #include <nlist.h> 63 #include <paths.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <unistd.h> 68 #include <utmpx.h> 69 #include <vis.h> 70 71 #include <arpa/nameser.h> 72 #include <resolv.h> 73 74 #include "extern.h" 75 76 static struct winsize ws; 77 static kvm_t *kd; 78 static time_t now; /* the current time of day */ 79 static time_t then; 80 static int ttywidth; /* width of tty */ 81 static int argwidth; /* width of tty */ 82 static int header = 1; /* true if -h flag: don't print heading */ 83 static int nflag; /* true if -n flag: don't convert addrs */ 84 static int dflag; /* true if -d flag: output debug info */ 85 static int sortidle; /* sort by idle time */ 86 int use_ampm; /* use AM/PM time */ 87 static int use_comma; /* use comma as floats separator */ 88 static char **sel_users; /* login array of particular users selected */ 89 static char domain[MAXHOSTNAMELEN]; 90 static int maxname = 8, maxline = 3, maxhost = 16; 91 92 /* 93 * One of these per active utmpx entry. 94 */ 95 static struct entry { 96 struct entry *next; 97 char name[UTX_USERSIZE + 1]; 98 char line[UTX_LINESIZE + 1]; 99 char host[UTX_HOSTSIZE + 1]; 100 char type[2]; 101 struct timeval tv; 102 dev_t tdev; /* dev_t of terminal */ 103 time_t idle; /* idle time of terminal in seconds */ 104 struct kinfo_proc *kp; /* `most interesting' proc */ 105 char *args; /* arg list of interesting process */ 106 struct kinfo_proc *dkp; /* debug option proc list */ 107 pid_t pid; /* pid or ~0 if not known */ 108 } *ep, *ehead = NULL, **nextp = &ehead; 109 110 #define debugproc(p) *((struct kinfo_proc **)&(p)->kp_spare[0]) 111 112 static void pr_header(time_t *, int); 113 static struct stat *ttystat(char *, int); 114 static void process(struct entry *); 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 in_addr_t l; 127 int ch, i, nentries, nusers, wcmd, longidle, dropgid; 128 char *memf, *nlistf, *p, *x; 129 struct utmpx *utx; 130 char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX]; 131 132 (void)setlocale(LC_ALL, ""); 133 use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0'); 134 use_comma = (*nl_langinfo(RADIXCHAR) != ','); 135 136 /* Are we w(1) or uptime(1)? */ 137 if (this_is_uptime(argv[0]) == 0) { 138 wcmd = 0; 139 p = ""; 140 } else { 141 wcmd = 1; 142 p = "dhiflM:N:nsuw"; 143 } 144 145 dropgid = 0; 146 memf = nlistf = _PATH_DEVNULL; 147 while ((ch = getopt(argc, argv, p)) != -1) 148 switch (ch) { 149 case 'd': 150 dflag = 1; 151 break; 152 case 'h': 153 header = 0; 154 break; 155 case 'i': 156 sortidle = 1; 157 break; 158 case 'M': 159 header = 0; 160 memf = optarg; 161 dropgid = 1; 162 break; 163 case 'N': 164 nlistf = optarg; 165 dropgid = 1; 166 break; 167 case 'n': 168 nflag = 1; 169 break; 170 case 'f': case 'l': case 's': case 'u': case 'w': 171 warnx("[-flsuw] no longer supported"); 172 /* FALLTHROUGH */ 173 case '?': 174 default: 175 usage(wcmd); 176 } 177 argc -= optind; 178 argv += optind; 179 180 if (!(_res.options & RES_INIT)) 181 res_init(); 182 _res.retrans = 2; /* resolver timeout to 2 seconds per try */ 183 _res.retry = 1; /* only try once.. */ 184 185 /* 186 * Discard setgid privileges if not the running kernel so that bad 187 * guys can't print interesting stuff from kernel memory. 188 */ 189 if (dropgid) 190 setgid(getgid()); 191 192 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 193 errx(1, "%s", errbuf); 194 195 (void)time(&now); 196 setutxent(); 197 198 if (*argv) 199 sel_users = argv; 200 201 nusers = 0; 202 while ((utx = getutxent()) != NULL) { 203 if (utx->ut_type != USER_PROCESS) 204 continue; 205 ++nusers; 206 207 if (sel_users) { 208 int usermatch; 209 char **user; 210 211 usermatch = 0; 212 for (user = sel_users; !usermatch && *user; user++) 213 if (!strncmp(utx->ut_name, *user, UTX_USERSIZE)) 214 usermatch = 1; 215 if (!usermatch) 216 continue; 217 } 218 219 if ((ep = calloc(1, sizeof(struct entry))) == NULL) 220 err(1, NULL); 221 (void)memcpy(ep->name, utx->ut_name, sizeof(utx->ut_name)); 222 (void)memcpy(ep->line, utx->ut_line, sizeof(utx->ut_line)); 223 (void)memcpy(ep->host, utx->ut_host, sizeof(utx->ut_host)); 224 ep->name[sizeof(utx->ut_name)] = '\0'; 225 ep->line[sizeof(utx->ut_line)] = '\0'; 226 ep->host[sizeof(utx->ut_host)] = '\0'; 227 #if 1 228 /* XXX: Actually we don't support the utx->ut_ss stuff yet */ 229 if (!nflag || getnameinfo((struct sockaddr *)&utx->ut_ss, 230 utx->ut_ss.ss_len, ep->host, sizeof(ep->host), NULL, 0, 231 NI_NUMERICHOST) != 0) { 232 (void)memcpy(ep->host, utx->ut_host, 233 sizeof(utx->ut_host)); 234 ep->host[sizeof(utx->ut_host)] = '\0'; 235 } 236 #endif 237 ep->type[0] = 'x'; 238 ep->tv = utx->ut_tv; 239 ep->pid = utx->ut_pid; 240 241 *nextp = ep; 242 nextp = &(ep->next); 243 if (wcmd != 0) 244 process(ep); 245 } 246 endutxent(); 247 248 if (header || wcmd == 0) { 249 pr_header(&now, nusers); 250 if (wcmd == 0) { 251 (void)kvm_close(kd); 252 exit(0); 253 } 254 255 #define HEADER_USER "USER" 256 #define HEADER_TTY "TTY" 257 #define HEADER_FROM "FROM" 258 #define HEADER_LOGIN_IDLE "LOGIN@ IDLE " 259 #define HEADER_WHAT "WHAT\n" 260 #define WUSED (maxname + maxline + maxhost + \ 261 sizeof(HEADER_LOGIN_IDLE) + 3) /* header width incl. spaces */ 262 (void)printf("%-*.*s %-*.*s %-*.*s %s", 263 maxname, maxname, HEADER_USER, 264 maxline, maxline, HEADER_TTY, 265 maxhost, maxhost, HEADER_FROM, 266 HEADER_LOGIN_IDLE HEADER_WHAT); 267 } 268 269 if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL) 270 err(1, "%s", kvm_geterr(kd)); 271 for (i = 0; i < nentries; i++, kp++) { 272 /* 273 * login(1) is a special case. 274 */ 275 if (strcmp(kp->kp_comm, "login") == 0) 276 continue; 277 if (kp->kp_stat == SIDL || kp->kp_stat == SZOMB) 278 continue; 279 if (kp->kp_sid != kp->kp_tsid) 280 continue; 281 for (ep = ehead; ep != NULL; ep = ep->next) { 282 if (ep->tdev == kp->kp_tdev) { 283 /* 284 * proc is associated with this terminal 285 */ 286 if (ep->kp == NULL && kp->kp_pgid == kp->kp_tpgid) { 287 /* 288 * Proc is 'most interesting' 289 */ 290 if (proc_compare(ep->kp, kp)) 291 ep->kp = kp; 292 } 293 /* 294 * Proc debug option info; add to debug 295 * list using kinfo_proc kp_eproc.e_spare 296 * as next pointer; ptr to ptr avoids the 297 * ptr = long assumption. 298 */ 299 dkp = ep->dkp; 300 ep->dkp = kp; 301 debugproc(kp) = dkp; 302 } 303 if (ep->pid != 0 && ep->pid == kp->kp_pid) { 304 ep->kp = kp; 305 break; 306 } 307 } 308 } 309 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 310 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 311 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 312 ttywidth = 79; 313 else 314 ttywidth = ws.ws_col - 1; 315 argwidth = ttywidth - WUSED; 316 if (argwidth < 4) 317 argwidth = 8; 318 for (ep = ehead; ep != NULL; ep = ep->next) { 319 if (ep->kp == NULL) { 320 ep->args = "-"; 321 continue; 322 } 323 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth), 324 ep->kp->kp_comm, MAXCOMLEN); 325 if (ep->args == NULL) 326 err(1, NULL); 327 } 328 /* sort by idle time */ 329 if (sortidle && ehead != NULL) { 330 struct entry *from, *save; 331 332 from = ehead; 333 ehead = NULL; 334 while (from != NULL) { 335 for (nextp = &ehead; 336 (*nextp) && from->idle >= (*nextp)->idle; 337 nextp = &(*nextp)->next) 338 continue; 339 save = from; 340 from = from->next; 341 save->next = *nextp; 342 *nextp = save; 343 } 344 } else if (ehead != NULL) { 345 struct entry *from = ehead, *save; 346 347 ehead = NULL; 348 while (from != NULL) { 349 for (nextp = &ehead; 350 (*nextp) && strcmp(from->line, (*nextp)->line) > 0; 351 nextp = &(*nextp)->next) 352 continue; 353 save = from; 354 from = from->next; 355 save->next = *nextp; 356 *nextp = save; 357 } 358 } 359 360 if (!nflag) { 361 if (gethostname(domain, sizeof(domain)) < 0 || 362 (p = strchr(domain, '.')) == NULL) 363 domain[0] = '\0'; 364 else { 365 domain[sizeof(domain) - 1] = '\0'; 366 memmove(domain, p, strlen(p) + 1); 367 } 368 } 369 370 for (ep = ehead; ep != NULL; ep = ep->next) { 371 char host_buf[UTX_HOSTSIZE + 1]; 372 373 host_buf[UTX_HOSTSIZE] = '\0'; 374 strncpy(host_buf, ep->host, maxhost); 375 p = *host_buf ? host_buf : "-"; 376 if ((x = strchr(p, ':')) != NULL) 377 *x++ = '\0'; 378 if (!nflag && isdigit(*p) && 379 (l = inet_addr(p)) != INADDR_NONE && 380 (hp = gethostbyaddr(&l, sizeof(l), AF_INET))) { 381 if (domain[0] != '\0') { 382 p = hp->h_name; 383 p += strlen(hp->h_name); 384 p -= strlen(domain); 385 if (p > hp->h_name && 386 strcasecmp(p, domain) == 0) 387 *p = '\0'; 388 } 389 p = hp->h_name; 390 } 391 if (nflag && *p && strcmp(p, "-") && 392 inet_addr(p) == INADDR_NONE) { 393 hp = gethostbyname(p); 394 395 if (hp != NULL) { 396 struct in_addr in; 397 398 memmove(&in, hp->h_addr, sizeof(in)); 399 p = inet_ntoa(in); 400 } 401 } 402 if (x) { 403 (void)snprintf(buf, sizeof(buf), "%s:%s", p, x); 404 p = buf; 405 } 406 if (dflag) { 407 for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) { 408 char *ptr; 409 410 ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth), 411 dkp->kp_comm, MAXCOMLEN); 412 if (ptr == NULL) 413 ptr = "-"; 414 (void)printf("\t\t%-9d %s\n", 415 dkp->kp_pid, ptr); 416 } 417 } 418 (void)printf("%-*.*s %-*.*s %-*.*s ", 419 maxname, maxname, ep->name, 420 maxline, maxline, 421 strncmp(ep->line, "tty", 3) && 422 strncmp(ep->line, "cua", 3) ? 423 ep->line : ep->line + 3, 424 maxhost, maxhost, *p ? p : "-"); 425 then = (time_t)ep->tv.tv_sec; 426 pr_attime(&then, &now); 427 longidle = pr_idle(ep->idle); 428 (void)printf("%.*s\n", argwidth - longidle, ep->args); 429 } 430 (void)kvm_close(kd); 431 exit(0); 432 } 433 434 static void 435 pr_header(time_t *nowp, int nusers) 436 { 437 struct timespec boot_ts; 438 double avenrun[3]; 439 time_t uptime; 440 int days, hrs, i, mins, secs; 441 char buf[256]; 442 443 /* 444 * Print time of day. (use "AM"/"PM" for all locales) 445 */ 446 (void)strftime_l(buf, sizeof(buf) - 1, 447 use_ampm ? "%l:%M%p" : "%k:%M", 448 localtime(nowp), NULL); 449 buf[sizeof(buf) - 1] = '\0'; 450 (void)printf("%s ", buf); 451 452 /* 453 * Print how long system has been up. 454 * 455 * Use clock_gettime() rather than trying to calculate 456 * a realtime delta that would be subject to time and date 457 * changes. 458 */ 459 if (clock_gettime(CLOCK_UPTIME, &boot_ts) == 0) { 460 uptime = boot_ts.tv_sec; 461 if (uptime > 60) 462 uptime += 30; 463 days = uptime / 86400; 464 uptime %= 86400; 465 hrs = uptime / 3600; 466 uptime %= 3600; 467 mins = uptime / 60; 468 secs = uptime % 60; 469 (void)printf(" up"); 470 if (days > 0) 471 (void)printf(" %d day%s,", days, days > 1 ? "s" : ""); 472 if (hrs > 0 && mins > 0) 473 (void)printf(" %2d:%02d,", hrs, mins); 474 else if (hrs > 0) 475 (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : ""); 476 else if (mins > 0) 477 (void)printf(" %d min%s,", mins, mins > 1 ? "s" : ""); 478 else 479 (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : ""); 480 } 481 482 /* Print number of users logged in on system */ 483 (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s"); 484 485 /* 486 * Print 1, 5, and 15 minute load averages. 487 */ 488 if (getloadavg(avenrun, NELEM(avenrun)) == -1) 489 (void)printf(", no load average information available\n"); 490 else { 491 (void)printf(", load averages:"); 492 for (i = 0; i < (int)NELEM(avenrun); i++) { 493 if (use_comma && i > 0) 494 (void)printf(","); 495 (void)printf(" %.2f", avenrun[i]); 496 } 497 (void)printf("\n"); 498 } 499 } 500 501 static struct stat * 502 ttystat(char *line, int sz) 503 { 504 static struct stat sb; 505 char ttybuf[MAXPATHLEN]; 506 507 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line); 508 if (stat(ttybuf, &sb)) { 509 warn("%s", ttybuf); 510 return (NULL); 511 } 512 return (&sb); 513 } 514 515 static void 516 usage(int wcmd) 517 { 518 if (wcmd) 519 (void)fprintf(stderr, 520 "usage: w [-dhin] [-M core] [-N system] [user ...]\n"); 521 else 522 (void)fprintf(stderr, "usage: uptime\n"); 523 exit(1); 524 } 525 526 static int 527 this_is_uptime(const char *s) 528 { 529 const char *u; 530 531 if ((u = strrchr(s, '/')) != NULL) 532 ++u; 533 else 534 u = s; 535 if (strcmp(u, "uptime") == 0) 536 return (0); 537 return (-1); 538 } 539 540 static void 541 process(struct entry *ep) 542 { 543 struct stat *stp; 544 time_t touched; 545 int max; 546 547 if ((max = strlen(ep->name)) > maxname) 548 maxname = max; 549 if ((max = strlen(ep->line)) > maxline) 550 maxline = max; 551 if ((max = strlen(ep->host)) > maxhost) 552 maxhost = max; 553 554 ep->tdev = 0; 555 ep->idle = (time_t)-1; 556 557 if (!(stp = ttystat(ep->line, maxline))) 558 return; /* corrupted record */ 559 560 ep->tdev = stp->st_rdev; 561 #ifdef CPU_CONSDEV 562 /* 563 * If this is the console device, attempt to ascertain 564 * the true console device dev_t. 565 */ 566 if (ep->tdev == 0) { 567 int mib[2]; 568 size_t size; 569 570 mib[0] = CTL_MACHDEP; 571 mib[1] = CPU_CONSDEV; 572 size = sizeof(dev_t); 573 (void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 574 } 575 #endif 576 577 touched = stp->st_atime; 578 if (touched < ep->tv.tv_sec) { 579 /* tty untouched since before login */ 580 touched = ep->tv.tv_sec; 581 } 582 if ((ep->idle = now - touched) < 0) 583 ep->idle = 0; 584 } 585