1 /* $OpenBSD: w.c,v 1.70 2024/09/15 07:14:58 jsg Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1991, 1993, 1994 5 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * w - print system status (who and what) 34 * 35 * This program is similar to the systat command on Tenex/Tops 10/20 36 * 37 */ 38 #include <sys/time.h> 39 #include <sys/stat.h> 40 #include <sys/sysctl.h> 41 #include <sys/signal.h> 42 #include <sys/proc.h> 43 #include <sys/ioctl.h> 44 #include <sys/socket.h> 45 #include <sys/tty.h> 46 47 #include <netinet/in.h> 48 #include <arpa/inet.h> 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <kvm.h> 55 #include <netdb.h> 56 #include <nlist.h> 57 #include <paths.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 #include <limits.h> 63 #include <utmp.h> 64 #include <vis.h> 65 66 #include "extern.h" 67 68 struct utmp utmp; 69 struct winsize ws; 70 kvm_t *kd; 71 time_t now; /* the current time of day */ 72 int ttywidth; /* width of tty */ 73 int argwidth; /* width of tty */ 74 int header = 1; /* true if -h flag: don't print heading */ 75 int nflag = 1; /* true if -n flag: don't convert addrs */ 76 int sortidle; /* sort by idle time */ 77 char *sel_user; /* login of particular user selected */ 78 char domain[HOST_NAME_MAX+1]; 79 80 #define NAME_WIDTH 8 81 #define HOST_WIDTH 16 82 83 /* 84 * One of these per active utmp entry. 85 */ 86 struct entry { 87 struct entry *next; 88 struct utmp utmp; 89 dev_t tdev; /* dev_t of terminal */ 90 time_t idle; /* idle time of terminal in seconds */ 91 struct kinfo_proc *kp; /* `most interesting' proc */ 92 } *ep, *ehead = NULL, **nextp = &ehead; 93 94 static void fmt_putc(int, int *); 95 static void fmt_puts(const char *, int *); 96 static void pr_args(struct kinfo_proc *); 97 static void pr_header(time_t *, int); 98 static struct stat 99 *ttystat(char *); 100 static void usage(int); 101 static char *hostlookup(char *, char *); 102 103 int 104 main(int argc, char *argv[]) 105 { 106 extern char *__progname; 107 struct kinfo_proc *kp; 108 struct stat *stp; 109 FILE *ut; 110 int ch, i, nentries, nusers, wcmd; 111 char *memf, *nlistf, *p, *x; 112 char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX]; 113 114 /* Are we w(1) or uptime(1)? */ 115 p = __progname; 116 if (*p == '-') 117 p++; 118 if (p[0] == 'w' && p[1] == '\0') { 119 wcmd = 1; 120 p = "hiflM:N:asuw"; 121 } else if (!strcmp(p, "uptime")) { 122 wcmd = 0; 123 p = ""; 124 } else 125 errx(1, 126 "this program should be invoked only as \"w\" or \"uptime\""); 127 128 memf = nlistf = NULL; 129 while ((ch = getopt(argc, argv, p)) != -1) 130 switch (ch) { 131 case 'h': 132 header = 0; 133 break; 134 case 'i': 135 sortidle = 1; 136 break; 137 case 'M': 138 header = 0; 139 memf = optarg; 140 break; 141 case 'N': 142 nlistf = optarg; 143 break; 144 case 'a': 145 nflag = 0; 146 break; 147 case 'f': case 'l': case 's': case 'u': case 'w': 148 warnx("[-flsuw] no longer supported"); 149 /* FALLTHROUGH */ 150 default: 151 usage(wcmd); 152 } 153 argc -= optind; 154 argv += optind; 155 156 if (nflag == 0) { 157 if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1) 158 err(1, "pledge"); 159 } else { 160 if (pledge("stdio tty rpath ps vminfo", NULL) == -1) 161 err(1, "pledge"); 162 } 163 164 if (nlistf == NULL && memf == NULL) { 165 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES, 166 errbuf)) == NULL) 167 errx(1, "%s", errbuf); 168 } else { 169 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 170 errx(1, "%s", errbuf); 171 } 172 173 (void)time(&now); 174 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 175 err(1, "%s", _PATH_UTMP); 176 177 if (*argv) 178 sel_user = *argv; 179 180 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 181 if (utmp.ut_name[0] == '\0') 182 continue; 183 ++nusers; 184 if (wcmd == 0 || (sel_user && 185 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) 186 continue; 187 if ((ep = calloc(1, sizeof(*ep))) == NULL) 188 err(1, NULL); 189 *nextp = ep; 190 nextp = &(ep->next); 191 memcpy(&(ep->utmp), &utmp, sizeof(utmp)); 192 if (!(stp = ttystat(ep->utmp.ut_line))) 193 continue; 194 ep->tdev = stp->st_rdev; 195 196 /* 197 * If this is the console device, attempt to ascertain 198 * the true console device dev_t. 199 */ 200 if (ep->tdev == 0) { 201 int mib[2]; 202 size_t size; 203 204 mib[0] = CTL_KERN; 205 mib[1] = KERN_CONSDEV; 206 size = sizeof(dev_t); 207 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 208 } 209 210 if ((ep->idle = now - stp->st_atime) < 0) 211 ep->idle = 0; 212 } 213 (void)fclose(ut); 214 215 if (header || wcmd == 0) { 216 pr_header(&now, nusers); 217 if (wcmd == 0) 218 exit (0); 219 } 220 221 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT" 222 #define WUSED (sizeof(HEADER) - sizeof("WHAT")) 223 if (header) 224 (void)puts(HEADER); 225 226 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries); 227 if (kp == NULL) 228 errx(1, "%s", kvm_geterr(kd)); 229 230 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 231 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 232 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 233 ttywidth = 79; 234 else 235 ttywidth = ws.ws_col - 1; 236 argwidth = ttywidth - WUSED; 237 if (argwidth < 4) 238 argwidth = 8; 239 240 for (i = 0; i < nentries; i++, kp++) { 241 if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE)) 242 continue; 243 for (ep = ehead; ep != NULL; ep = ep->next) { 244 /* ftp is a special case. */ 245 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) { 246 char pidstr[UT_LINESIZE-2]; 247 pid_t fp; 248 249 (void)strncpy(pidstr, &ep->utmp.ut_line[3], 250 sizeof(pidstr) - 1); 251 pidstr[sizeof(pidstr) - 1] = '\0'; 252 fp = (pid_t)strtol(pidstr, NULL, 10); 253 if (kp->p_pid == fp) { 254 ep->kp = kp; 255 break; 256 } 257 } else if (ep->tdev == kp->p_tdev && 258 kp->p__pgid == kp->p_tpgid) { 259 /* 260 * Proc is in foreground of this terminal 261 */ 262 if (proc_compare(ep->kp, kp)) 263 ep->kp = kp; 264 break; 265 } 266 } 267 } 268 /* sort by idle time */ 269 if (sortidle && ehead != NULL) { 270 struct entry *from = ehead, *save; 271 272 ehead = NULL; 273 while (from != NULL) { 274 for (nextp = &ehead; 275 (*nextp) && from->idle >= (*nextp)->idle; 276 nextp = &(*nextp)->next) 277 continue; 278 save = from; 279 from = from->next; 280 save->next = *nextp; 281 *nextp = save; 282 } 283 } 284 285 if (!nflag) { 286 if (gethostname(domain, sizeof(domain)) == -1 || 287 (p = strchr(domain, '.')) == 0) 288 domain[0] = '\0'; 289 else { 290 domain[sizeof(domain) - 1] = '\0'; 291 memmove(domain, p, strlen(p) + 1); 292 } 293 } 294 295 for (ep = ehead; ep != NULL; ep = ep->next) { 296 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; 297 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) { 298 if (p[i] == ':') { 299 x = &p[i]; 300 *x++ = '\0'; 301 break; 302 } 303 } 304 305 if (x) { 306 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, 307 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); 308 p = buf; 309 } 310 311 if (!nflag) { 312 char *tmp; 313 314 if ((tmp = hostlookup(p, domain)) != NULL) 315 p = tmp; 316 } 317 318 (void)printf("%-*.*s %-2.2s %-*.*s ", 319 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name, 320 strncmp(ep->utmp.ut_line, "tty", 3) ? 321 ep->utmp.ut_line : ep->utmp.ut_line + 3, 322 HOST_WIDTH, HOST_WIDTH, *p ? p : "-"); 323 pr_attime(&ep->utmp.ut_time, &now); 324 pr_idle(ep->idle); 325 pr_args(ep->kp); 326 printf("\n"); 327 } 328 exit(0); 329 } 330 331 static void 332 fmt_putc(int c, int *leftp) 333 { 334 335 if (*leftp == 0) 336 return; 337 if (*leftp != -1) 338 *leftp -= 1; 339 putchar(c); 340 } 341 342 static void 343 fmt_puts(const char *s, int *leftp) 344 { 345 static char *v = NULL; 346 static size_t maxlen = 0; 347 size_t len; 348 349 if (*leftp == 0) 350 return; 351 len = strlen(s) * 4 + 1; 352 if (len > maxlen) { 353 free(v); 354 maxlen = 0; 355 if (len < getpagesize()) 356 len = getpagesize(); 357 v = malloc(len); 358 if (v == NULL) 359 return; 360 maxlen = len; 361 } 362 strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE); 363 if (*leftp != -1) { 364 len = strlen(v); 365 if (len > *leftp) { 366 v[*leftp] = '\0'; 367 *leftp = 0; 368 } else 369 *leftp -= len; 370 } 371 printf("%s", v); 372 } 373 374 375 static void 376 pr_args(struct kinfo_proc *kp) 377 { 378 char **argv, *str; 379 int left; 380 381 if (kp == NULL) 382 goto nothing; /* no matching process found */ 383 left = argwidth; 384 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */ 385 if (argv == NULL) 386 goto nothing; 387 388 if (*argv == NULL || **argv == '\0') { 389 /* Process has zeroed argv[0], display executable name. */ 390 fmt_putc('(', &left); 391 fmt_puts(kp->p_comm, &left); 392 fmt_putc(')', &left); 393 } 394 while (*argv) { 395 /* 396 * ftp argv[0] is in the following format: 397 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd) 398 */ 399 if (strncmp(*argv, "ftpd:", 5) == 0) { 400 if ((str = strchr(*argv + 5, ':')) != NULL) 401 str = strchr(str + 1, ':'); 402 if (str != NULL) { 403 if ((str[0] == ':') && 404 isspace((unsigned char)str[1])) 405 str += 2; 406 fmt_puts(str, &left); 407 } else 408 fmt_puts(*argv, &left); 409 } else 410 fmt_puts(*argv, &left); 411 argv++; 412 fmt_putc(' ', &left); 413 } 414 return; 415 nothing: 416 putchar('-'); 417 } 418 419 static void 420 pr_header(time_t *nowp, int nusers) 421 { 422 double avenrun[3]; 423 struct timespec boottime; 424 time_t uptime; 425 int days, hrs, i, mins; 426 char buf[256]; 427 428 /* 429 * Print time of day. 430 */ 431 (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp)); 432 buf[sizeof(buf) - 1] = '\0'; 433 (void)printf("%s ", buf); 434 435 /* 436 * Print how long system has been up. 437 */ 438 if (clock_gettime(CLOCK_BOOTTIME, &boottime) != -1) { 439 uptime = boottime.tv_sec; 440 if (uptime > 59) { 441 uptime += 30; 442 days = uptime / SECSPERDAY; 443 uptime %= SECSPERDAY; 444 hrs = uptime / SECSPERHOUR; 445 uptime %= SECSPERHOUR; 446 mins = uptime / 60; 447 (void)printf(" up"); 448 if (days > 0) 449 (void)printf(" %d day%s,", days, 450 days > 1 ? "s" : ""); 451 if (hrs > 0 && mins > 0) 452 (void)printf(" %2d:%02d,", hrs, mins); 453 else { 454 if (hrs > 0) 455 (void)printf(" %d hr%s,", 456 hrs, hrs > 1 ? "s" : ""); 457 if (mins > 0 || (days == 0 && hrs == 0)) 458 (void)printf(" %d min%s,", 459 mins, mins != 1 ? "s" : ""); 460 } 461 } else 462 printf(" %d secs,", (int)uptime); 463 } 464 465 /* Print number of users logged in to system */ 466 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : ""); 467 468 /* 469 * Print 1, 5, and 15 minute load averages. 470 */ 471 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) 472 (void)printf(", no load average information available\n"); 473 else { 474 (void)printf(", load averages:"); 475 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { 476 if (i > 0) 477 (void)printf(","); 478 (void)printf(" %.2f", avenrun[i]); 479 } 480 (void)printf("\n"); 481 } 482 } 483 484 static struct stat * 485 ttystat(char *line) 486 { 487 static struct stat sb; 488 char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE]; 489 490 /* Note, line may not be NUL-terminated */ 491 (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf)); 492 (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf)); 493 if (stat(ttybuf, &sb)) 494 return (NULL); 495 return (&sb); 496 } 497 498 static void 499 usage(int wcmd) 500 { 501 if (wcmd) 502 (void)fprintf(stderr, 503 "usage: w [-ahi] [-M core] [-N system] [user]\n"); 504 else 505 (void)fprintf(stderr, 506 "usage: uptime\n"); 507 exit (1); 508 } 509 510 static char* 511 hostlookup(char *host, char *domain) 512 { 513 static char buf[NI_MAXHOST]; 514 struct addrinfo hints, *res; 515 int error; 516 char *p; 517 518 memset(&hints, 0, sizeof(hints)); 519 if (getaddrinfo(host, NULL, &hints, &res) != 0) 520 return NULL; 521 522 error = getnameinfo(res->ai_addr, res->ai_addr->sa_len, buf, 523 sizeof(buf), NULL, 0, 0); 524 freeaddrinfo(res); 525 526 if (error) 527 return NULL; 528 529 if (domain[0] != '\0') { 530 p = buf; 531 p += strlen(buf); 532 p -= strlen(domain); 533 if (p > buf && strcasecmp(p, domain) == 0) 534 *p = '\0'; 535 } 536 return buf; 537 } 538