1 /* $NetBSD: w.c,v 1.34 1999/11/29 11:15:13 pk 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)w.c 8.6 (Berkeley) 6/30/94"; 45 #else 46 __RCSID("$NetBSD: w.c,v 1.34 1999/11/29 11:15:13 pk Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * w - print system status (who and what) 52 * 53 * This program is similar to the systat command on Tenex/Tops 10/20 54 * 55 */ 56 #include <sys/param.h> 57 #include <sys/time.h> 58 #include <sys/stat.h> 59 #include <sys/sysctl.h> 60 #include <sys/proc.h> 61 #include <sys/user.h> 62 #include <sys/ioctl.h> 63 #include <sys/socket.h> 64 65 #include <netinet/in.h> 66 #include <arpa/inet.h> 67 68 #include <ctype.h> 69 #include <err.h> 70 #include <errno.h> 71 #include <fcntl.h> 72 #include <kvm.h> 73 #include <limits.h> 74 #include <netdb.h> 75 #include <nlist.h> 76 #include <paths.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <time.h> 81 #include <tzfile.h> 82 #include <unistd.h> 83 #include <utmp.h> 84 #include <vis.h> 85 86 #include "extern.h" 87 88 struct timeval boottime; 89 struct utmp utmp; 90 struct winsize ws; 91 kvm_t *kd; 92 time_t now; /* the current time of day */ 93 time_t uptime; /* time of last reboot & elapsed time since */ 94 int ttywidth; /* width of tty */ 95 int argwidth; /* width of tty */ 96 int header = 1; /* true if -h flag: don't print heading */ 97 int nflag; /* true if -n flag: don't convert addrs */ 98 int sortidle; /* sort bu idle time */ 99 char *sel_user; /* login of particular user selected */ 100 char domain[MAXHOSTNAMELEN + 1]; 101 102 /* 103 * One of these per active utmp entry. 104 */ 105 struct entry { 106 struct entry *next; 107 struct utmp utmp; 108 dev_t tdev; /* dev_t of terminal */ 109 time_t idle; /* idle time of terminal in seconds */ 110 struct kinfo_proc *kp; /* `most interesting' proc */ 111 } *ep, *ehead = NULL, **nextp = &ehead; 112 113 static void pr_args __P((struct kinfo_proc *)); 114 static void pr_header __P((time_t *, int)); 115 static struct stat 116 *ttystat __P((char *)); 117 static void usage __P((int)); 118 int main __P((int, char **)); 119 120 int 121 main(argc, argv) 122 int argc; 123 char **argv; 124 { 125 extern char *__progname; 126 struct kinfo_proc *kp; 127 struct hostent *hp; 128 struct stat *stp; 129 FILE *ut; 130 struct in_addr l; 131 int ch, i, nentries, nusers, wcmd; 132 gid_t egid = getegid(); 133 char *memf, *nlistf, *p, *x; 134 char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX]; 135 136 (void)setegid(getgid()); 137 138 /* Are we w(1) or uptime(1)? */ 139 p = __progname; 140 if (*p == '-') 141 p++; 142 if (*p == 'u') { 143 wcmd = 0; 144 p = ""; 145 } else { 146 wcmd = 1; 147 p = "hiflM:N:nsuw"; 148 } 149 150 memf = nlistf = NULL; 151 while ((ch = getopt(argc, argv, p)) != -1) 152 switch (ch) { 153 case 'h': 154 header = 0; 155 break; 156 case 'i': 157 sortidle = 1; 158 break; 159 case 'M': 160 header = 0; 161 memf = optarg; 162 break; 163 case 'N': 164 nlistf = optarg; 165 break; 166 case 'n': 167 nflag = 1; 168 break; 169 case 'f': case 'l': case 's': case 'u': case 'w': 170 warnx("[-flsuw] no longer supported"); 171 /* FALLTHROUGH */ 172 case '?': 173 default: 174 usage(wcmd); 175 } 176 argc -= optind; 177 argv += optind; 178 179 /* 180 * Discard setgid privileges. If not the running kernel, we toss 181 * them away totally so that bad guys can't print interesting stuff 182 * from kernel memory, otherwise switch back to kmem for the 183 * duration of the kvm_openfiles() call. 184 */ 185 if (nlistf != NULL || memf != NULL) 186 (void)setgid(getgid()); 187 else 188 (void)setegid(egid); 189 190 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 191 errx(1, "%s", errbuf); 192 193 /* get rid of it now anyway */ 194 if (nlistf == NULL && memf == NULL) 195 (void)setgid(getgid()); 196 197 (void)time(&now); 198 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 199 err(1, "%s", _PATH_UTMP); 200 201 if (*argv) 202 sel_user = *argv; 203 204 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 205 if (utmp.ut_name[0] == '\0') 206 continue; 207 ++nusers; 208 if (wcmd == 0 || (sel_user && 209 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) 210 continue; 211 if ((ep = calloc(1, sizeof(struct entry))) == NULL) 212 err(1, NULL); 213 *nextp = ep; 214 nextp = &(ep->next); 215 memmove(&(ep->utmp), &utmp, sizeof(struct utmp)); 216 if (!(stp = ttystat(ep->utmp.ut_line))) 217 continue; 218 ep->tdev = stp->st_rdev; 219 #ifdef CPU_CONSDEV 220 /* 221 * If this is the console device, attempt to ascertain 222 * the true console device dev_t. 223 */ 224 if (ep->tdev == 0) { 225 int mib[2]; 226 size_t size; 227 228 mib[0] = CTL_MACHDEP; 229 mib[1] = CPU_CONSDEV; 230 size = sizeof(dev_t); 231 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 232 } 233 #endif 234 if ((ep->idle = now - stp->st_atime) < 0) 235 ep->idle = 0; 236 } 237 (void)fclose(ut); 238 239 if (header || wcmd == 0) { 240 pr_header(&now, nusers); 241 if (wcmd == 0) 242 exit (0); 243 } 244 245 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT\n" 246 #define WUSED (sizeof (HEADER) - sizeof ("WHAT\n")) 247 (void)printf(HEADER); 248 249 if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL) 250 errx(1, "%s", kvm_geterr(kd)); 251 for (i = 0; i < nentries; i++, kp++) { 252 struct proc *p = &kp->kp_proc; 253 struct eproc *e; 254 255 if (p->p_stat == SIDL || p->p_stat == SZOMB) 256 continue; 257 e = &kp->kp_eproc; 258 for (ep = ehead; ep != NULL; ep = ep->next) { 259 if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) { 260 /* 261 * Proc is in foreground of this terminal 262 */ 263 if (proc_compare(&ep->kp->kp_proc, p)) 264 ep->kp = kp; 265 break; 266 } 267 } 268 } 269 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 270 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 271 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 272 ttywidth = 79; 273 else 274 ttywidth = ws.ws_col - 1; 275 argwidth = ttywidth - WUSED; 276 if (argwidth < 4) 277 argwidth = 8; 278 /* sort by idle time */ 279 if (sortidle && ehead != NULL) { 280 struct entry *from = ehead, *save; 281 282 ehead = NULL; 283 while (from != NULL) { 284 for (nextp = &ehead; 285 (*nextp) && from->idle >= (*nextp)->idle; 286 nextp = &(*nextp)->next) 287 continue; 288 save = from; 289 from = from->next; 290 save->next = *nextp; 291 *nextp = save; 292 } 293 } 294 295 if (!nflag) { 296 int rv; 297 298 rv = gethostname(domain, sizeof(domain)); 299 domain[sizeof(domain) - 1] = '\0'; 300 if (rv < 0 || (p = strchr(domain, '.')) == 0) 301 domain[0] = '\0'; 302 else 303 memmove(domain, p, strlen(p) + 1); 304 } 305 306 for (ep = ehead; ep != NULL; ep = ep->next) { 307 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; 308 for (x = p; x < p + UT_HOSTSIZE; x++) 309 if (*x == '\0' || *x == ':') 310 break; 311 if (x == p + UT_HOSTSIZE || *x != ':') 312 x = NULL; 313 else 314 *x++ = '\0'; 315 316 if (!nflag && inet_aton(p, &l) && 317 (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) { 318 if (domain[0] != '\0') { 319 p = hp->h_name; 320 p += strlen(hp->h_name); 321 p -= strlen(domain); 322 if (p > hp->h_name && strcmp(p, domain) == 0) 323 *p = '\0'; 324 } 325 p = hp->h_name; 326 } 327 if (x) { 328 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, 329 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); 330 p = buf; 331 } 332 (void)printf("%-*.*s %-2.2s %-*.*s ", 333 UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name, 334 (strncmp(ep->utmp.ut_line, "tty", 3) && 335 strncmp(ep->utmp.ut_line, "dty", 3)) ? 336 ep->utmp.ut_line : ep->utmp.ut_line + 3, 337 UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-"); 338 pr_attime(&ep->utmp.ut_time, &now); 339 pr_idle(ep->idle); 340 pr_args(ep->kp); 341 printf("\n"); 342 } 343 exit(0); 344 } 345 346 static void 347 pr_args(kp) 348 struct kinfo_proc *kp; 349 { 350 char **argv; 351 int left; 352 353 if (kp == 0) 354 goto nothing; 355 left = argwidth; 356 argv = kvm_getargv(kd, kp, argwidth); 357 if (argv == 0) 358 goto nothing; 359 while (*argv) { 360 fmt_puts(*argv, &left); 361 argv++; 362 fmt_putc(' ', &left); 363 } 364 return; 365 nothing: 366 putchar('-'); 367 } 368 369 static void 370 pr_header(nowp, nusers) 371 time_t *nowp; 372 int nusers; 373 { 374 double avenrun[3]; 375 time_t uptime; 376 int days, hrs, i, mins; 377 int mib[2]; 378 size_t size; 379 char buf[256]; 380 381 /* 382 * Print time of day. 383 * 384 * SCCS forces the string manipulation below, as it replaces 385 * %, M, and % in a character string with the file name. 386 */ 387 (void)strftime(buf, sizeof(buf), 388 __CONCAT("%l:%","M%p"), localtime(nowp)); 389 buf[sizeof(buf) - 1] = '\0'; 390 (void)printf("%s ", buf); 391 392 /* 393 * Print how long system has been up. 394 * (Found by looking getting "boottime" from the kernel) 395 */ 396 mib[0] = CTL_KERN; 397 mib[1] = KERN_BOOTTIME; 398 size = sizeof(boottime); 399 if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 && 400 boottime.tv_sec != 0) { 401 uptime = now - boottime.tv_sec; 402 uptime += 30; 403 if (uptime > SECSPERMIN) { 404 days = uptime / SECSPERDAY; 405 uptime %= SECSPERDAY; 406 hrs = uptime / SECSPERHOUR; 407 uptime %= SECSPERHOUR; 408 mins = uptime / SECSPERMIN; 409 (void)printf(" up"); 410 if (days > 0) 411 (void)printf(" %d day%s,", days, 412 days > 1 ? "s" : ""); 413 if (hrs > 0 && mins > 0) 414 (void)printf(" %2d:%02d,", hrs, mins); 415 else { 416 if (hrs > 0) 417 (void)printf(" %d hr%s,", 418 hrs, hrs > 1 ? "s" : ""); 419 if (mins > 0) 420 (void)printf(" %d min%s,", 421 mins, mins > 1 ? "s" : ""); 422 } 423 } 424 } 425 426 /* Print number of users logged in to system */ 427 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : ""); 428 429 /* 430 * Print 1, 5, and 15 minute load averages. 431 */ 432 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) 433 (void)printf(", no load average information available\n"); 434 else { 435 (void)printf(", load averages:"); 436 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { 437 if (i > 0) 438 (void)printf(","); 439 (void)printf(" %.2f", avenrun[i]); 440 } 441 (void)printf("\n"); 442 } 443 } 444 445 static struct stat * 446 ttystat(line) 447 char *line; 448 { 449 static struct stat sb; 450 char ttybuf[MAXPATHLEN]; 451 452 (void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line); 453 if (stat(ttybuf, &sb)) 454 return (NULL); 455 return (&sb); 456 } 457 458 static void 459 usage(wcmd) 460 int wcmd; 461 { 462 if (wcmd) 463 (void)fprintf(stderr, 464 "usage: w: [-hin] [-M core] [-N system] [user]\n"); 465 else 466 (void)fprintf(stderr, "uptime\n"); 467 exit(1); 468 } 469