1 /* $OpenBSD: w.c,v 1.67 2022/02/22 17:35:01 deraadt 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); 101 102 int 103 main(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 case '?': 152 default: 153 usage(wcmd); 154 } 155 argc -= optind; 156 argv += optind; 157 158 if (nflag == 0) { 159 if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1) 160 err(1, "pledge"); 161 } else { 162 if (pledge("stdio tty rpath ps vminfo", NULL) == -1) 163 err(1, "pledge"); 164 } 165 166 if (nlistf == NULL && memf == NULL) { 167 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES, 168 errbuf)) == NULL) 169 errx(1, "%s", errbuf); 170 } else { 171 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 172 errx(1, "%s", errbuf); 173 } 174 175 (void)time(&now); 176 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 177 err(1, "%s", _PATH_UTMP); 178 179 if (*argv) 180 sel_user = *argv; 181 182 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 183 if (utmp.ut_name[0] == '\0') 184 continue; 185 ++nusers; 186 if (wcmd == 0 || (sel_user && 187 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) 188 continue; 189 if ((ep = calloc(1, sizeof(*ep))) == NULL) 190 err(1, NULL); 191 *nextp = ep; 192 nextp = &(ep->next); 193 memcpy(&(ep->utmp), &utmp, sizeof(utmp)); 194 if (!(stp = ttystat(ep->utmp.ut_line))) 195 continue; 196 ep->tdev = stp->st_rdev; 197 198 /* 199 * If this is the console device, attempt to ascertain 200 * the true console device dev_t. 201 */ 202 if (ep->tdev == 0) { 203 int mib[2]; 204 size_t size; 205 206 mib[0] = CTL_KERN; 207 mib[1] = KERN_CONSDEV; 208 size = sizeof(dev_t); 209 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 210 } 211 212 if ((ep->idle = now - stp->st_atime) < 0) 213 ep->idle = 0; 214 } 215 (void)fclose(ut); 216 217 if (header || wcmd == 0) { 218 pr_header(&now, nusers); 219 if (wcmd == 0) 220 exit (0); 221 } 222 223 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT" 224 #define WUSED (sizeof(HEADER) - sizeof("WHAT")) 225 if (header) 226 (void)puts(HEADER); 227 228 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries); 229 if (kp == NULL) 230 errx(1, "%s", kvm_geterr(kd)); 231 232 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 233 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 234 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 235 ttywidth = 79; 236 else 237 ttywidth = ws.ws_col - 1; 238 argwidth = ttywidth - WUSED; 239 if (argwidth < 4) 240 argwidth = 8; 241 242 for (i = 0; i < nentries; i++, kp++) { 243 if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE)) 244 continue; 245 for (ep = ehead; ep != NULL; ep = ep->next) { 246 /* ftp is a special case. */ 247 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) { 248 char pidstr[UT_LINESIZE-2]; 249 pid_t fp; 250 251 (void)strncpy(pidstr, &ep->utmp.ut_line[3], 252 sizeof(pidstr) - 1); 253 pidstr[sizeof(pidstr) - 1] = '\0'; 254 fp = (pid_t)strtol(pidstr, NULL, 10); 255 if (kp->p_pid == fp) { 256 ep->kp = kp; 257 break; 258 } 259 } else if (ep->tdev == kp->p_tdev && 260 kp->p__pgid == kp->p_tpgid) { 261 /* 262 * Proc is in foreground of this terminal 263 */ 264 if (proc_compare(ep->kp, kp)) 265 ep->kp = kp; 266 break; 267 } 268 } 269 } 270 /* sort by idle time */ 271 if (sortidle && ehead != NULL) { 272 struct entry *from = ehead, *save; 273 274 ehead = NULL; 275 while (from != NULL) { 276 for (nextp = &ehead; 277 (*nextp) && from->idle >= (*nextp)->idle; 278 nextp = &(*nextp)->next) 279 continue; 280 save = from; 281 from = from->next; 282 save->next = *nextp; 283 *nextp = save; 284 } 285 } 286 287 if (!nflag) { 288 if (gethostname(domain, sizeof(domain)) == -1 || 289 (p = strchr(domain, '.')) == 0) 290 domain[0] = '\0'; 291 else { 292 domain[sizeof(domain) - 1] = '\0'; 293 memmove(domain, p, strlen(p) + 1); 294 } 295 } 296 297 for (ep = ehead; ep != NULL; ep = ep->next) { 298 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; 299 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) 300 if (p[i] == ':') { 301 x = &p[i]; 302 *x++ = '\0'; 303 break; 304 } 305 if (!nflag && inet_aton(p, &addr) && 306 (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) { 307 if (domain[0] != '\0') { 308 p = hp->h_name; 309 p += strlen(hp->h_name); 310 p -= strlen(domain); 311 if (p > hp->h_name && 312 strcasecmp(p, domain) == 0) 313 *p = '\0'; 314 } 315 p = hp->h_name; 316 } 317 if (x) { 318 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, 319 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); 320 p = buf; 321 } 322 (void)printf("%-*.*s %-2.2s %-*.*s ", 323 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name, 324 strncmp(ep->utmp.ut_line, "tty", 3) ? 325 ep->utmp.ut_line : ep->utmp.ut_line + 3, 326 HOST_WIDTH, HOST_WIDTH, *p ? p : "-"); 327 pr_attime(&ep->utmp.ut_time, &now); 328 pr_idle(ep->idle); 329 pr_args(ep->kp); 330 printf("\n"); 331 } 332 exit(0); 333 } 334 335 static void 336 fmt_putc(int c, int *leftp) 337 { 338 339 if (*leftp == 0) 340 return; 341 if (*leftp != -1) 342 *leftp -= 1; 343 putchar(c); 344 } 345 346 static void 347 fmt_puts(const char *s, int *leftp) 348 { 349 static char *v = NULL; 350 static size_t maxlen = 0; 351 size_t len; 352 353 if (*leftp == 0) 354 return; 355 len = strlen(s) * 4 + 1; 356 if (len > maxlen) { 357 free(v); 358 maxlen = 0; 359 if (len < getpagesize()) 360 len = getpagesize(); 361 v = malloc(len); 362 if (v == NULL) 363 return; 364 maxlen = len; 365 } 366 strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE); 367 if (*leftp != -1) { 368 len = strlen(v); 369 if (len > *leftp) { 370 v[*leftp] = '\0'; 371 *leftp = 0; 372 } else 373 *leftp -= len; 374 } 375 printf("%s", v); 376 } 377 378 379 static void 380 pr_args(struct kinfo_proc *kp) 381 { 382 char **argv, *str; 383 int left; 384 385 if (kp == NULL) 386 goto nothing; /* no matching process found */ 387 left = argwidth; 388 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */ 389 if (argv == NULL) 390 goto nothing; 391 392 if (*argv == NULL || **argv == '\0') { 393 /* Process has zeroed argv[0], display executable name. */ 394 fmt_putc('(', &left); 395 fmt_puts(kp->p_comm, &left); 396 fmt_putc(')', &left); 397 } 398 while (*argv) { 399 /* 400 * ftp argv[0] is in the following format: 401 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd) 402 */ 403 if (strncmp(*argv, "ftpd:", 5) == 0) { 404 if ((str = strchr(*argv + 5, ':')) != NULL) 405 str = strchr(str + 1, ':'); 406 if (str != NULL) { 407 if ((str[0] == ':') && 408 isspace((unsigned char)str[1])) 409 str += 2; 410 fmt_puts(str, &left); 411 } else 412 fmt_puts(*argv, &left); 413 } else 414 fmt_puts(*argv, &left); 415 argv++; 416 fmt_putc(' ', &left); 417 } 418 return; 419 nothing: 420 putchar('-'); 421 } 422 423 static void 424 pr_header(time_t *nowp, int nusers) 425 { 426 double avenrun[3]; 427 struct timespec boottime; 428 time_t uptime; 429 int days, hrs, i, mins; 430 char buf[256]; 431 432 /* 433 * Print time of day. 434 */ 435 (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp)); 436 buf[sizeof(buf) - 1] = '\0'; 437 (void)printf("%s ", buf); 438 439 /* 440 * Print how long system has been up. 441 */ 442 if (clock_gettime(CLOCK_BOOTTIME, &boottime) != -1) { 443 uptime = boottime.tv_sec; 444 if (uptime > 59) { 445 uptime += 30; 446 days = uptime / SECSPERDAY; 447 uptime %= SECSPERDAY; 448 hrs = uptime / SECSPERHOUR; 449 uptime %= SECSPERHOUR; 450 mins = uptime / 60; 451 (void)printf(" up"); 452 if (days > 0) 453 (void)printf(" %d day%s,", days, 454 days > 1 ? "s" : ""); 455 if (hrs > 0 && mins > 0) 456 (void)printf(" %2d:%02d,", hrs, mins); 457 else { 458 if (hrs > 0) 459 (void)printf(" %d hr%s,", 460 hrs, hrs > 1 ? "s" : ""); 461 if (mins > 0 || (days == 0 && hrs == 0)) 462 (void)printf(" %d min%s,", 463 mins, mins != 1 ? "s" : ""); 464 } 465 } else 466 printf(" %d secs,", (int)uptime); 467 } 468 469 /* Print number of users logged in to system */ 470 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : ""); 471 472 /* 473 * Print 1, 5, and 15 minute load averages. 474 */ 475 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) 476 (void)printf(", no load average information available\n"); 477 else { 478 (void)printf(", load averages:"); 479 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { 480 if (i > 0) 481 (void)printf(","); 482 (void)printf(" %.2f", avenrun[i]); 483 } 484 (void)printf("\n"); 485 } 486 } 487 488 static struct stat * 489 ttystat(char *line) 490 { 491 static struct stat sb; 492 char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE]; 493 494 /* Note, line may not be NUL-terminated */ 495 (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf)); 496 (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf)); 497 if (stat(ttybuf, &sb)) 498 return (NULL); 499 return (&sb); 500 } 501 502 static void 503 usage(int wcmd) 504 { 505 if (wcmd) 506 (void)fprintf(stderr, 507 "usage: w [-ahi] [-M core] [-N system] [user]\n"); 508 else 509 (void)fprintf(stderr, 510 "usage: uptime\n"); 511 exit (1); 512 } 513