1 /* $OpenBSD: w.c,v 1.64 2017/12/14 18:03:03 jasper 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/param.h> /* MAXCOMLEN */ 39 #include <sys/time.h> 40 #include <sys/stat.h> 41 #include <sys/sysctl.h> 42 #include <sys/signal.h> 43 #include <sys/proc.h> 44 #include <sys/ioctl.h> 45 #include <sys/socket.h> 46 #include <sys/tty.h> 47 48 #include <netinet/in.h> 49 #include <arpa/inet.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <kvm.h> 56 #include <netdb.h> 57 #include <nlist.h> 58 #include <paths.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 #include <limits.h> 64 #include <utmp.h> 65 #include <vis.h> 66 67 #include "extern.h" 68 69 struct timeval boottime; 70 struct utmp utmp; 71 struct winsize ws; 72 kvm_t *kd; 73 time_t now; /* the current time of day */ 74 int ttywidth; /* width of tty */ 75 int argwidth; /* width of tty */ 76 int header = 1; /* true if -h flag: don't print heading */ 77 int nflag = 1; /* true if -n flag: don't convert addrs */ 78 int sortidle; /* sort by idle time */ 79 char *sel_user; /* login of particular user selected */ 80 char domain[HOST_NAME_MAX+1]; 81 82 #define NAME_WIDTH 8 83 #define HOST_WIDTH 16 84 85 /* 86 * One of these per active utmp entry. 87 */ 88 struct entry { 89 struct entry *next; 90 struct utmp utmp; 91 dev_t tdev; /* dev_t of terminal */ 92 time_t idle; /* idle time of terminal in seconds */ 93 struct kinfo_proc *kp; /* `most interesting' proc */ 94 } *ep, *ehead = NULL, **nextp = &ehead; 95 96 static void fmt_putc(int, int *); 97 static void fmt_puts(const char *, int *); 98 static void pr_args(struct kinfo_proc *); 99 static void pr_header(time_t *, int); 100 static struct stat 101 *ttystat(char *); 102 static void usage(int); 103 104 int 105 main(int argc, char *argv[]) 106 { 107 extern char *__progname; 108 struct kinfo_proc *kp; 109 struct hostent *hp; 110 struct stat *stp; 111 FILE *ut; 112 struct in_addr addr; 113 int ch, i, nentries, nusers, wcmd; 114 char *memf, *nlistf, *p, *x; 115 char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX]; 116 117 /* Are we w(1) or uptime(1)? */ 118 p = __progname; 119 if (*p == '-') 120 p++; 121 if (p[0] == 'w' && p[1] == '\0') { 122 wcmd = 1; 123 p = "hiflM:N:asuw"; 124 } else if (!strcmp(p, "uptime")) { 125 wcmd = 0; 126 p = ""; 127 } else 128 errx(1, 129 "this program should be invoked only as \"w\" or \"uptime\""); 130 131 memf = nlistf = NULL; 132 while ((ch = getopt(argc, argv, p)) != -1) 133 switch (ch) { 134 case 'h': 135 header = 0; 136 break; 137 case 'i': 138 sortidle = 1; 139 break; 140 case 'M': 141 header = 0; 142 memf = optarg; 143 break; 144 case 'N': 145 nlistf = optarg; 146 break; 147 case 'a': 148 nflag = 0; 149 break; 150 case 'f': case 'l': case 's': case 'u': case 'w': 151 warnx("[-flsuw] no longer supported"); 152 /* FALLTHROUGH */ 153 case '?': 154 default: 155 usage(wcmd); 156 } 157 argc -= optind; 158 argv += optind; 159 160 if (nflag == 0) { 161 if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1) 162 err(1, "pledge"); 163 } else { 164 if (pledge("stdio tty rpath ps vminfo", NULL) == -1) 165 err(1, "pledge"); 166 } 167 168 if (nlistf == NULL && memf == NULL) { 169 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES, 170 errbuf)) == NULL) 171 errx(1, "%s", errbuf); 172 } else { 173 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 174 errx(1, "%s", errbuf); 175 } 176 177 (void)time(&now); 178 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 179 err(1, "%s", _PATH_UTMP); 180 181 if (*argv) 182 sel_user = *argv; 183 184 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 185 if (utmp.ut_name[0] == '\0') 186 continue; 187 ++nusers; 188 if (wcmd == 0 || (sel_user && 189 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) 190 continue; 191 if ((ep = calloc(1, sizeof(*ep))) == NULL) 192 err(1, NULL); 193 *nextp = ep; 194 nextp = &(ep->next); 195 memcpy(&(ep->utmp), &utmp, sizeof(utmp)); 196 if (!(stp = ttystat(ep->utmp.ut_line))) 197 continue; 198 ep->tdev = stp->st_rdev; 199 200 /* 201 * If this is the console device, attempt to ascertain 202 * the true console device dev_t. 203 */ 204 if (ep->tdev == 0) { 205 int mib[2]; 206 size_t size; 207 208 mib[0] = CTL_KERN; 209 mib[1] = KERN_CONSDEV; 210 size = sizeof(dev_t); 211 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 212 } 213 214 if ((ep->idle = now - stp->st_atime) < 0) 215 ep->idle = 0; 216 } 217 (void)fclose(ut); 218 219 if (header || wcmd == 0) { 220 pr_header(&now, nusers); 221 if (wcmd == 0) 222 exit (0); 223 } 224 225 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT" 226 #define WUSED (sizeof(HEADER) - sizeof("WHAT")) 227 if (header) 228 (void)puts(HEADER); 229 230 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries); 231 if (kp == NULL) 232 errx(1, "%s", kvm_geterr(kd)); 233 234 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 235 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 236 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 237 ttywidth = 79; 238 else 239 ttywidth = ws.ws_col - 1; 240 argwidth = ttywidth - WUSED; 241 if (argwidth < 4) 242 argwidth = 8; 243 244 for (i = 0; i < nentries; i++, kp++) { 245 if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE)) 246 continue; 247 for (ep = ehead; ep != NULL; ep = ep->next) { 248 /* ftp is a special case. */ 249 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) { 250 char pidstr[UT_LINESIZE-2]; 251 pid_t fp; 252 253 (void)strncpy(pidstr, &ep->utmp.ut_line[3], 254 sizeof(pidstr) - 1); 255 pidstr[sizeof(pidstr) - 1] = '\0'; 256 fp = (pid_t)strtol(pidstr, NULL, 10); 257 if (kp->p_pid == fp) { 258 ep->kp = kp; 259 break; 260 } 261 } else if (ep->tdev == kp->p_tdev && 262 kp->p__pgid == kp->p_tpgid) { 263 /* 264 * Proc is in foreground of this terminal 265 */ 266 if (proc_compare(ep->kp, kp)) 267 ep->kp = kp; 268 break; 269 } 270 } 271 } 272 /* sort by idle time */ 273 if (sortidle && ehead != NULL) { 274 struct entry *from = ehead, *save; 275 276 ehead = NULL; 277 while (from != NULL) { 278 for (nextp = &ehead; 279 (*nextp) && from->idle >= (*nextp)->idle; 280 nextp = &(*nextp)->next) 281 continue; 282 save = from; 283 from = from->next; 284 save->next = *nextp; 285 *nextp = save; 286 } 287 } 288 289 if (!nflag) { 290 if (gethostname(domain, sizeof(domain)) < 0 || 291 (p = strchr(domain, '.')) == 0) 292 domain[0] = '\0'; 293 else { 294 domain[sizeof(domain) - 1] = '\0'; 295 memmove(domain, p, strlen(p) + 1); 296 } 297 } 298 299 for (ep = ehead; ep != NULL; ep = ep->next) { 300 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; 301 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) 302 if (p[i] == ':') { 303 x = &p[i]; 304 *x++ = '\0'; 305 break; 306 } 307 if (!nflag && inet_aton(p, &addr) && 308 (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) { 309 if (domain[0] != '\0') { 310 p = hp->h_name; 311 p += strlen(hp->h_name); 312 p -= strlen(domain); 313 if (p > hp->h_name && 314 strcasecmp(p, domain) == 0) 315 *p = '\0'; 316 } 317 p = hp->h_name; 318 } 319 if (x) { 320 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, 321 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); 322 p = buf; 323 } 324 (void)printf("%-*.*s %-2.2s %-*.*s ", 325 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name, 326 strncmp(ep->utmp.ut_line, "tty", 3) ? 327 ep->utmp.ut_line : ep->utmp.ut_line + 3, 328 HOST_WIDTH, HOST_WIDTH, *p ? p : "-"); 329 pr_attime(&ep->utmp.ut_time, &now); 330 pr_idle(ep->idle); 331 pr_args(ep->kp); 332 printf("\n"); 333 } 334 exit(0); 335 } 336 337 static void 338 fmt_putc(int c, int *leftp) 339 { 340 341 if (*leftp == 0) 342 return; 343 if (*leftp != -1) 344 *leftp -= 1; 345 putchar(c); 346 } 347 348 static void 349 fmt_puts(const char *s, int *leftp) 350 { 351 static char *v = NULL; 352 static size_t maxlen = 0; 353 size_t len; 354 355 if (*leftp == 0) 356 return; 357 len = strlen(s) * 4 + 1; 358 if (len > maxlen) { 359 free(v); 360 maxlen = 0; 361 if (len < getpagesize()) 362 len = getpagesize(); 363 v = malloc(len); 364 if (v == NULL) 365 return; 366 maxlen = len; 367 } 368 strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE); 369 if (*leftp != -1) { 370 len = strlen(v); 371 if (len > *leftp) { 372 v[*leftp] = '\0'; 373 *leftp = 0; 374 } else 375 *leftp -= len; 376 } 377 printf("%s", v); 378 } 379 380 381 static void 382 pr_args(struct kinfo_proc *kp) 383 { 384 char **argv, *str; 385 int left; 386 387 if (kp == NULL) 388 goto nothing; /* no matching process found */ 389 left = argwidth; 390 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */ 391 if (argv == NULL) 392 goto nothing; 393 394 if (*argv == NULL || **argv == '\0') { 395 /* Process has zeroed argv[0], display executable name. */ 396 fmt_putc('(', &left); 397 fmt_puts(kp->p_comm, &left); 398 fmt_putc(')', &left); 399 } 400 while (*argv) { 401 /* 402 * ftp argv[0] is in the following format: 403 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd) 404 */ 405 if (strncmp(*argv, "ftpd:", 5) == 0) { 406 if ((str = strchr(*argv + 5, ':')) != NULL) 407 str = strchr(str + 1, ':'); 408 if (str != NULL) { 409 if ((str[0] == ':') && 410 isspace((unsigned char)str[1])) 411 str += 2; 412 fmt_puts(str, &left); 413 } else 414 fmt_puts(*argv, &left); 415 } else 416 fmt_puts(*argv, &left); 417 argv++; 418 fmt_putc(' ', &left); 419 } 420 return; 421 nothing: 422 putchar('-'); 423 } 424 425 static void 426 pr_header(time_t *nowp, int nusers) 427 { 428 double avenrun[3]; 429 time_t uptime; 430 int days, hrs, i, mins; 431 int mib[2]; 432 size_t size; 433 char buf[256]; 434 435 /* 436 * Print time of day. 437 */ 438 (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp)); 439 buf[sizeof(buf) - 1] = '\0'; 440 (void)printf("%s ", buf); 441 442 /* 443 * Print how long system has been up. 444 * (Found by getting "boottime" from the kernel) 445 */ 446 mib[0] = CTL_KERN; 447 mib[1] = KERN_BOOTTIME; 448 size = sizeof(boottime); 449 if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) { 450 uptime = now - boottime.tv_sec; 451 if (uptime > 59) { 452 uptime += 30; 453 days = uptime / SECSPERDAY; 454 uptime %= SECSPERDAY; 455 hrs = uptime / SECSPERHOUR; 456 uptime %= SECSPERHOUR; 457 mins = uptime / 60; 458 (void)printf(" up"); 459 if (days > 0) 460 (void)printf(" %d day%s,", days, 461 days > 1 ? "s" : ""); 462 if (hrs > 0 && mins > 0) 463 (void)printf(" %2d:%02d,", hrs, mins); 464 else { 465 if (hrs > 0) 466 (void)printf(" %d hr%s,", 467 hrs, hrs > 1 ? "s" : ""); 468 if (mins > 0 || (days == 0 && hrs == 0)) 469 (void)printf(" %d min%s,", 470 mins, mins != 1 ? "s" : ""); 471 } 472 } else 473 printf(" %d secs,", (int)uptime); 474 } 475 476 /* Print number of users logged in to system */ 477 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : ""); 478 479 /* 480 * Print 1, 5, and 15 minute load averages. 481 */ 482 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) 483 (void)printf(", no load average information available\n"); 484 else { 485 (void)printf(", load averages:"); 486 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { 487 if (i > 0) 488 (void)printf(","); 489 (void)printf(" %.2f", avenrun[i]); 490 } 491 (void)printf("\n"); 492 } 493 } 494 495 static struct stat * 496 ttystat(char *line) 497 { 498 static struct stat sb; 499 char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE]; 500 501 /* Note, line may not be NUL-terminated */ 502 (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf)); 503 (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf)); 504 if (stat(ttybuf, &sb)) 505 return (NULL); 506 return (&sb); 507 } 508 509 static void 510 usage(int wcmd) 511 { 512 if (wcmd) 513 (void)fprintf(stderr, 514 "usage: w [-ahi] [-M core] [-N system] [user]\n"); 515 else 516 (void)fprintf(stderr, 517 "usage: uptime\n"); 518 exit (1); 519 } 520