1/* $OpenBSD: w.c,v 1.68 2022/12/04 23:50:50 cheloha 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 68struct utmp utmp; 69struct winsize ws; 70kvm_t *kd; 71time_t now; /* the current time of day */ 72int ttywidth; /* width of tty */ 73int argwidth; /* width of tty */ 74int header = 1; /* true if -h flag: don't print heading */ 75int nflag = 1; /* true if -n flag: don't convert addrs */ 76int sortidle; /* sort by idle time */ 77char *sel_user; /* login of particular user selected */ 78char 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 */ 86struct 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 94static void fmt_putc(int, int *); 95static void fmt_puts(const char *, int *); 96static void pr_args(struct kinfo_proc *); 97static void pr_header(time_t *, int); 98static struct stat 99 *ttystat(char *); 100static void usage(int); 101 102int 103main(int argc, char *argv[]) 104{ 105 extern char *__progname; 106 struct kinfo_proc *kp; 107 struct hostent *hp; 108 struct stat *stp; 109 FILE *ut; 110 struct in_addr addr; 111 int ch, i, nentries, nusers, wcmd; 112 char *memf, *nlistf, *p, *x; 113 char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX]; 114 115 /* Are we w(1) or uptime(1)? */ 116 p = __progname; 117 if (*p == '-') 118 p++; 119 if (p[0] == 'w' && p[1] == '\0') { 120 wcmd = 1; 121 p = "hiflM:N:asuw"; 122 } else if (!strcmp(p, "uptime")) { 123 wcmd = 0; 124 p = ""; 125 } else 126 errx(1, 127 "this program should be invoked only as \"w\" or \"uptime\""); 128 129 memf = nlistf = NULL; 130 while ((ch = getopt(argc, argv, p)) != -1) 131 switch (ch) { 132 case 'h': 133 header = 0; 134 break; 135 case 'i': 136 sortidle = 1; 137 break; 138 case 'M': 139 header = 0; 140 memf = optarg; 141 break; 142 case 'N': 143 nlistf = optarg; 144 break; 145 case 'a': 146 nflag = 0; 147 break; 148 case 'f': case 'l': case 's': case 'u': case 'w': 149 warnx("[-flsuw] no longer supported"); 150 /* FALLTHROUGH */ 151 default: 152 usage(wcmd); 153 } 154 argc -= optind; 155 argv += optind; 156 157 if (nflag == 0) { 158 if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1) 159 err(1, "pledge"); 160 } else { 161 if (pledge("stdio tty rpath ps vminfo", NULL) == -1) 162 err(1, "pledge"); 163 } 164 165 if (nlistf == NULL && memf == NULL) { 166 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES, 167 errbuf)) == NULL) 168 errx(1, "%s", errbuf); 169 } else { 170 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 171 errx(1, "%s", errbuf); 172 } 173 174 (void)time(&now); 175 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 176 err(1, "%s", _PATH_UTMP); 177 178 if (*argv) 179 sel_user = *argv; 180 181 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 182 if (utmp.ut_name[0] == '\0') 183 continue; 184 ++nusers; 185 if (wcmd == 0 || (sel_user && 186 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) 187 continue; 188 if ((ep = calloc(1, sizeof(*ep))) == NULL) 189 err(1, NULL); 190 *nextp = ep; 191 nextp = &(ep->next); 192 memcpy(&(ep->utmp), &utmp, sizeof(utmp)); 193 if (!(stp = ttystat(ep->utmp.ut_line))) 194 continue; 195 ep->tdev = stp->st_rdev; 196 197 /* 198 * If this is the console device, attempt to ascertain 199 * the true console device dev_t. 200 */ 201 if (ep->tdev == 0) { 202 int mib[2]; 203 size_t size; 204 205 mib[0] = CTL_KERN; 206 mib[1] = KERN_CONSDEV; 207 size = sizeof(dev_t); 208 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 209 } 210 211 if ((ep->idle = now - stp->st_atime) < 0) 212 ep->idle = 0; 213 } 214 (void)fclose(ut); 215 216 if (header || wcmd == 0) { 217 pr_header(&now, nusers); 218 if (wcmd == 0) 219 exit (0); 220 } 221 222#define HEADER "USER TTY FROM LOGIN@ IDLE WHAT" 223#define WUSED (sizeof(HEADER) - sizeof("WHAT")) 224 if (header) 225 (void)puts(HEADER); 226 227 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries); 228 if (kp == NULL) 229 errx(1, "%s", kvm_geterr(kd)); 230 231 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 232 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 233 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 234 ttywidth = 79; 235 else 236 ttywidth = ws.ws_col - 1; 237 argwidth = ttywidth - WUSED; 238 if (argwidth < 4) 239 argwidth = 8; 240 241 for (i = 0; i < nentries; i++, kp++) { 242 if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE)) 243 continue; 244 for (ep = ehead; ep != NULL; ep = ep->next) { 245 /* ftp is a special case. */ 246 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) { 247 char pidstr[UT_LINESIZE-2]; 248 pid_t fp; 249 250 (void)strncpy(pidstr, &ep->utmp.ut_line[3], 251 sizeof(pidstr) - 1); 252 pidstr[sizeof(pidstr) - 1] = '\0'; 253 fp = (pid_t)strtol(pidstr, NULL, 10); 254 if (kp->p_pid == fp) { 255 ep->kp = kp; 256 break; 257 } 258 } else if (ep->tdev == kp->p_tdev && 259 kp->p__pgid == kp->p_tpgid) { 260 /* 261 * Proc is in foreground of this terminal 262 */ 263 if (proc_compare(ep->kp, kp)) 264 ep->kp = kp; 265 break; 266 } 267 } 268 } 269 /* sort by idle time */ 270 if (sortidle && ehead != NULL) { 271 struct entry *from = ehead, *save; 272 273 ehead = NULL; 274 while (from != NULL) { 275 for (nextp = &ehead; 276 (*nextp) && from->idle >= (*nextp)->idle; 277 nextp = &(*nextp)->next) 278 continue; 279 save = from; 280 from = from->next; 281 save->next = *nextp; 282 *nextp = save; 283 } 284 } 285 286 if (!nflag) { 287 if (gethostname(domain, sizeof(domain)) == -1 || 288 (p = strchr(domain, '.')) == 0) 289 domain[0] = '\0'; 290 else { 291 domain[sizeof(domain) - 1] = '\0'; 292 memmove(domain, p, strlen(p) + 1); 293 } 294 } 295 296 for (ep = ehead; ep != NULL; ep = ep->next) { 297 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; 298 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) 299 if (p[i] == ':') { 300 x = &p[i]; 301 *x++ = '\0'; 302 break; 303 } 304 if (!nflag && inet_aton(p, &addr) && 305 (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) { 306 if (domain[0] != '\0') { 307 p = hp->h_name; 308 p += strlen(hp->h_name); 309 p -= strlen(domain); 310 if (p > hp->h_name && 311 strcasecmp(p, domain) == 0) 312 *p = '\0'; 313 } 314 p = hp->h_name; 315 } 316 if (x) { 317 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, 318 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); 319 p = buf; 320 } 321 (void)printf("%-*.*s %-2.2s %-*.*s ", 322 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name, 323 strncmp(ep->utmp.ut_line, "tty", 3) ? 324 ep->utmp.ut_line : ep->utmp.ut_line + 3, 325 HOST_WIDTH, HOST_WIDTH, *p ? p : "-"); 326 pr_attime(&ep->utmp.ut_time, &now); 327 pr_idle(ep->idle); 328 pr_args(ep->kp); 329 printf("\n"); 330 } 331 exit(0); 332} 333 334static void 335fmt_putc(int c, int *leftp) 336{ 337 338 if (*leftp == 0) 339 return; 340 if (*leftp != -1) 341 *leftp -= 1; 342 putchar(c); 343} 344 345static void 346fmt_puts(const char *s, int *leftp) 347{ 348 static char *v = NULL; 349 static size_t maxlen = 0; 350 size_t len; 351 352 if (*leftp == 0) 353 return; 354 len = strlen(s) * 4 + 1; 355 if (len > maxlen) { 356 free(v); 357 maxlen = 0; 358 if (len < getpagesize()) 359 len = getpagesize(); 360 v = malloc(len); 361 if (v == NULL) 362 return; 363 maxlen = len; 364 } 365 strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE); 366 if (*leftp != -1) { 367 len = strlen(v); 368 if (len > *leftp) { 369 v[*leftp] = '\0'; 370 *leftp = 0; 371 } else 372 *leftp -= len; 373 } 374 printf("%s", v); 375} 376 377 378static void 379pr_args(struct kinfo_proc *kp) 380{ 381 char **argv, *str; 382 int left; 383 384 if (kp == NULL) 385 goto nothing; /* no matching process found */ 386 left = argwidth; 387 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */ 388 if (argv == NULL) 389 goto nothing; 390 391 if (*argv == NULL || **argv == '\0') { 392 /* Process has zeroed argv[0], display executable name. */ 393 fmt_putc('(', &left); 394 fmt_puts(kp->p_comm, &left); 395 fmt_putc(')', &left); 396 } 397 while (*argv) { 398 /* 399 * ftp argv[0] is in the following format: 400 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd) 401 */ 402 if (strncmp(*argv, "ftpd:", 5) == 0) { 403 if ((str = strchr(*argv + 5, ':')) != NULL) 404 str = strchr(str + 1, ':'); 405 if (str != NULL) { 406 if ((str[0] == ':') && 407 isspace((unsigned char)str[1])) 408 str += 2; 409 fmt_puts(str, &left); 410 } else 411 fmt_puts(*argv, &left); 412 } else 413 fmt_puts(*argv, &left); 414 argv++; 415 fmt_putc(' ', &left); 416 } 417 return; 418nothing: 419 putchar('-'); 420} 421 422static void 423pr_header(time_t *nowp, int nusers) 424{ 425 double avenrun[3]; 426 struct timespec boottime; 427 time_t uptime; 428 int days, hrs, i, mins; 429 char buf[256]; 430 431 /* 432 * Print time of day. 433 */ 434 (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp)); 435 buf[sizeof(buf) - 1] = '\0'; 436 (void)printf("%s ", buf); 437 438 /* 439 * Print how long system has been up. 440 */ 441 if (clock_gettime(CLOCK_BOOTTIME, &boottime) != -1) { 442 uptime = boottime.tv_sec; 443 if (uptime > 59) { 444 uptime += 30; 445 days = uptime / SECSPERDAY; 446 uptime %= SECSPERDAY; 447 hrs = uptime / SECSPERHOUR; 448 uptime %= SECSPERHOUR; 449 mins = uptime / 60; 450 (void)printf(" up"); 451 if (days > 0) 452 (void)printf(" %d day%s,", days, 453 days > 1 ? "s" : ""); 454 if (hrs > 0 && mins > 0) 455 (void)printf(" %2d:%02d,", hrs, mins); 456 else { 457 if (hrs > 0) 458 (void)printf(" %d hr%s,", 459 hrs, hrs > 1 ? "s" : ""); 460 if (mins > 0 || (days == 0 && hrs == 0)) 461 (void)printf(" %d min%s,", 462 mins, mins != 1 ? "s" : ""); 463 } 464 } else 465 printf(" %d secs,", (int)uptime); 466 } 467 468 /* Print number of users logged in to system */ 469 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : ""); 470 471 /* 472 * Print 1, 5, and 15 minute load averages. 473 */ 474 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) 475 (void)printf(", no load average information available\n"); 476 else { 477 (void)printf(", load averages:"); 478 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { 479 if (i > 0) 480 (void)printf(","); 481 (void)printf(" %.2f", avenrun[i]); 482 } 483 (void)printf("\n"); 484 } 485} 486 487static struct stat * 488ttystat(char *line) 489{ 490 static struct stat sb; 491 char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE]; 492 493 /* Note, line may not be NUL-terminated */ 494 (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf)); 495 (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf)); 496 if (stat(ttybuf, &sb)) 497 return (NULL); 498 return (&sb); 499} 500 501static void 502usage(int wcmd) 503{ 504 if (wcmd) 505 (void)fprintf(stderr, 506 "usage: w [-ahi] [-M core] [-N system] [user]\n"); 507 else 508 (void)fprintf(stderr, 509 "usage: uptime\n"); 510 exit (1); 511} 512