1 /* $OpenBSD: w.c,v 1.55 2014/07/04 05:58:31 guenther 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> 39 #include <sys/time.h> 40 #include <sys/stat.h> 41 #include <sys/sysctl.h> 42 #include <sys/proc.h> 43 #include <sys/ioctl.h> 44 #include <sys/socket.h> 45 #include <sys/tty.h> 46 47 #include <machine/cpu.h> 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 <tzfile.h> 63 #include <unistd.h> 64 #include <limits.h> 65 #include <utmp.h> 66 #include <vis.h> 67 68 #include "extern.h" 69 70 struct timeval boottime; 71 struct utmp utmp; 72 struct winsize ws; 73 kvm_t *kd; 74 time_t now; /* the current time of day */ 75 int ttywidth; /* width of tty */ 76 int argwidth; /* width of tty */ 77 int header = 1; /* true if -h flag: don't print heading */ 78 int nflag = 1; /* true if -n flag: don't convert addrs */ 79 int sortidle; /* sort by idle time */ 80 char *sel_user; /* login of particular user selected */ 81 char domain[MAXHOSTNAMELEN]; 82 83 #define NAME_WIDTH 8 84 #define HOST_WIDTH 16 85 86 /* 87 * One of these per active utmp entry. 88 */ 89 struct entry { 90 struct entry *next; 91 struct utmp utmp; 92 dev_t tdev; /* dev_t of terminal */ 93 time_t idle; /* idle time of terminal in seconds */ 94 struct kinfo_proc *kp; /* `most interesting' proc */ 95 } *ep, *ehead = NULL, **nextp = &ehead; 96 97 static void pr_args(struct kinfo_proc *); 98 static void pr_header(time_t *, int); 99 static struct stat 100 *ttystat(char *); 101 static void usage(int); 102 103 int 104 main(int argc, char *argv[]) 105 { 106 extern char *__progname; 107 struct kinfo_proc *kp; 108 struct hostent *hp; 109 struct stat *stp; 110 FILE *ut; 111 struct in_addr addr; 112 int ch, i, nentries, nusers, wcmd; 113 char *memf, *nlistf, *p, *x; 114 char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX]; 115 116 /* Are we w(1) or uptime(1)? */ 117 p = __progname; 118 if (*p == '-') 119 p++; 120 if (p[0] == 'w' && p[1] == '\0') { 121 wcmd = 1; 122 p = "hiflM:N:asuw"; 123 } else if (!strcmp(p, "uptime")) { 124 wcmd = 0; 125 p = ""; 126 } else 127 errx(1, 128 "this program should be invoked only as \"w\" or \"uptime\""); 129 130 memf = nlistf = NULL; 131 while ((ch = getopt(argc, argv, p)) != -1) 132 switch (ch) { 133 case 'h': 134 header = 0; 135 break; 136 case 'i': 137 sortidle = 1; 138 break; 139 case 'M': 140 header = 0; 141 memf = optarg; 142 break; 143 case 'N': 144 nlistf = optarg; 145 break; 146 case 'a': 147 nflag = 0; 148 break; 149 case 'f': case 'l': case 's': case 'u': case 'w': 150 warnx("[-flsuw] no longer supported"); 151 /* FALLTHROUGH */ 152 case '?': 153 default: 154 usage(wcmd); 155 } 156 argc -= optind; 157 argv += optind; 158 159 if (nlistf == NULL && memf == NULL) { 160 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES, 161 errbuf)) == NULL) 162 errx(1, "%s", errbuf); 163 } else { 164 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 165 errx(1, "%s", errbuf); 166 } 167 168 (void)time(&now); 169 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 170 err(1, "%s", _PATH_UTMP); 171 172 if (*argv) 173 sel_user = *argv; 174 175 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 176 if (utmp.ut_name[0] == '\0') 177 continue; 178 ++nusers; 179 if (wcmd == 0 || (sel_user && 180 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) 181 continue; 182 if ((ep = calloc(1, sizeof(*ep))) == NULL) 183 err(1, NULL); 184 *nextp = ep; 185 nextp = &(ep->next); 186 memcpy(&(ep->utmp), &utmp, sizeof(utmp)); 187 if (!(stp = ttystat(ep->utmp.ut_line))) 188 continue; 189 ep->tdev = stp->st_rdev; 190 191 /* 192 * If this is the console device, attempt to ascertain 193 * the true console device dev_t. 194 */ 195 if (ep->tdev == 0) { 196 int mib[2]; 197 size_t size; 198 199 mib[0] = CTL_KERN; 200 mib[1] = KERN_CONSDEV; 201 size = sizeof(dev_t); 202 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 203 } 204 205 if ((ep->idle = now - stp->st_atime) < 0) 206 ep->idle = 0; 207 } 208 (void)fclose(ut); 209 210 if (header || wcmd == 0) { 211 pr_header(&now, nusers); 212 if (wcmd == 0) 213 exit (0); 214 } 215 216 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT" 217 #define WUSED (sizeof(HEADER) - sizeof("WHAT")) 218 (void)puts(HEADER); 219 220 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries); 221 if (kp == NULL) 222 errx(1, "%s", kvm_geterr(kd)); 223 for (i = 0; i < nentries; i++, kp++) { 224 if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE)) 225 continue; 226 for (ep = ehead; ep != NULL; ep = ep->next) { 227 /* ftp is a special case. */ 228 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) { 229 char pidstr[UT_LINESIZE-2]; 230 pid_t fp; 231 232 (void)strncpy(pidstr, &ep->utmp.ut_line[3], 233 sizeof(pidstr) - 1); 234 pidstr[sizeof(pidstr) - 1] = '\0'; 235 fp = (pid_t)strtol(pidstr, NULL, 10); 236 if (kp->p_pid == fp) { 237 ep->kp = kp; 238 break; 239 } 240 } else if (ep->tdev == kp->p_tdev && 241 kp->p__pgid == kp->p_tpgid) { 242 /* 243 * Proc is in foreground of this terminal 244 */ 245 if (proc_compare(ep->kp, kp)) 246 ep->kp = kp; 247 break; 248 } 249 } 250 } 251 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 252 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 253 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 254 ttywidth = 79; 255 else 256 ttywidth = ws.ws_col - 1; 257 argwidth = ttywidth - WUSED; 258 if (argwidth < 4) 259 argwidth = 8; 260 /* sort by idle time */ 261 if (sortidle && ehead != NULL) { 262 struct entry *from = ehead, *save; 263 264 ehead = NULL; 265 while (from != NULL) { 266 for (nextp = &ehead; 267 (*nextp) && from->idle >= (*nextp)->idle; 268 nextp = &(*nextp)->next) 269 continue; 270 save = from; 271 from = from->next; 272 save->next = *nextp; 273 *nextp = save; 274 } 275 } 276 277 if (!nflag) { 278 if (gethostname(domain, sizeof(domain)) < 0 || 279 (p = strchr(domain, '.')) == 0) 280 domain[0] = '\0'; 281 else { 282 domain[sizeof(domain) - 1] = '\0'; 283 memmove(domain, p, strlen(p) + 1); 284 } 285 } 286 287 for (ep = ehead; ep != NULL; ep = ep->next) { 288 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; 289 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) 290 if (p[i] == ':') { 291 x = &p[i]; 292 *x++ = '\0'; 293 break; 294 } 295 if (!nflag && inet_aton(p, &addr) && 296 (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) { 297 if (domain[0] != '\0') { 298 p = hp->h_name; 299 p += strlen(hp->h_name); 300 p -= strlen(domain); 301 if (p > hp->h_name && 302 strcasecmp(p, domain) == 0) 303 *p = '\0'; 304 } 305 p = hp->h_name; 306 } 307 if (x) { 308 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, 309 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); 310 p = buf; 311 } 312 (void)printf("%-*.*s %-2.2s %-*.*s ", 313 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name, 314 strncmp(ep->utmp.ut_line, "tty", 3) ? 315 ep->utmp.ut_line : ep->utmp.ut_line + 3, 316 HOST_WIDTH, HOST_WIDTH, *p ? p : "-"); 317 pr_attime(&ep->utmp.ut_time, &now); 318 pr_idle(ep->idle); 319 pr_args(ep->kp); 320 printf("\n"); 321 } 322 exit(0); 323 } 324 325 static void 326 pr_args(struct kinfo_proc *kp) 327 { 328 char **argv, *str; 329 int left; 330 331 if (kp == NULL) 332 goto nothing; /* XXX - can this happen? */ 333 left = argwidth; 334 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */ 335 if (argv == NULL) 336 goto nothing; 337 338 if (*argv == NULL || **argv == '\0') { 339 /* Process has zeroed argv[0], display executable name. */ 340 fmt_putc('(', &left); 341 fmt_puts(kp->p_comm, &left); 342 fmt_putc(')', &left); 343 } 344 while (*argv) { 345 /* 346 * ftp argv[0] is in the following format: 347 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd) 348 */ 349 if (strncmp(*argv, "ftpd:", 5) == 0) { 350 if ((str = strchr(*argv + 5, ':')) != NULL) 351 str = strchr(str + 1, ':'); 352 if (str != NULL) { 353 if ((str[0] == ':') && 354 isspace((unsigned char)str[1])) 355 str += 2; 356 fmt_puts(str, &left); 357 } else 358 fmt_puts(*argv, &left); 359 } else 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(time_t *nowp, int nusers) 371 { 372 double avenrun[3]; 373 time_t uptime; 374 int days, hrs, i, mins; 375 int mib[2]; 376 size_t size; 377 char buf[256]; 378 379 /* 380 * Print time of day. 381 */ 382 (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp)); 383 buf[sizeof(buf) - 1] = '\0'; 384 (void)printf("%s ", buf); 385 386 /* 387 * Print how long system has been up. 388 * (Found by getting "boottime" from the kernel) 389 */ 390 mib[0] = CTL_KERN; 391 mib[1] = KERN_BOOTTIME; 392 size = sizeof(boottime); 393 if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) { 394 uptime = now - boottime.tv_sec; 395 if (uptime > 59) { 396 uptime += 30; 397 days = uptime / SECSPERDAY; 398 uptime %= SECSPERDAY; 399 hrs = uptime / SECSPERHOUR; 400 uptime %= SECSPERHOUR; 401 mins = uptime / SECSPERMIN; 402 (void)printf(" up"); 403 if (days > 0) 404 (void)printf(" %d day%s,", days, 405 days > 1 ? "s" : ""); 406 if (hrs > 0 && mins > 0) 407 (void)printf(" %2d:%02d,", hrs, mins); 408 else { 409 if (hrs > 0) 410 (void)printf(" %d hr%s,", 411 hrs, hrs > 1 ? "s" : ""); 412 if (mins > 0 || (days == 0 && hrs == 0)) 413 (void)printf(" %d min%s,", 414 mins, mins != 1 ? "s" : ""); 415 } 416 } else 417 printf(" %d secs,", (int)uptime); 418 } 419 420 /* Print number of users logged in to system */ 421 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : ""); 422 423 /* 424 * Print 1, 5, and 15 minute load averages. 425 */ 426 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1) 427 (void)printf(", no load average information available\n"); 428 else { 429 (void)printf(", load averages:"); 430 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) { 431 if (i > 0) 432 (void)printf(","); 433 (void)printf(" %.2f", avenrun[i]); 434 } 435 (void)printf("\n"); 436 } 437 } 438 439 static struct stat * 440 ttystat(char *line) 441 { 442 static struct stat sb; 443 char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE]; 444 445 /* Note, line may not be NUL-terminated */ 446 (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf)); 447 (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf)); 448 if (stat(ttybuf, &sb)) 449 return (NULL); 450 return (&sb); 451 } 452 453 static void 454 usage(int wcmd) 455 { 456 if (wcmd) 457 (void)fprintf(stderr, 458 "usage: w [-ahi] [-M core] [-N system] [user]\n"); 459 else 460 (void)fprintf(stderr, 461 "usage: uptime\n"); 462 exit (1); 463 } 464