1 /* $OpenBSD: w.c,v 1.50 2011/07/28 10:14:00 kettenis 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/user.h> 44 #include <sys/ioctl.h> 45 #include <sys/socket.h> 46 #include <sys/tty.h> 47 48 #include <machine/cpu.h> 49 #include <netinet/in.h> 50 #include <arpa/inet.h> 51 52 #include <ctype.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <kvm.h> 57 #include <netdb.h> 58 #include <nlist.h> 59 #include <paths.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <tzfile.h> 64 #include <unistd.h> 65 #include <limits.h> 66 #include <utmp.h> 67 #include <vis.h> 68 69 #include "extern.h" 70 71 struct timeval boottime; 72 struct utmp utmp; 73 struct winsize ws; 74 kvm_t *kd; 75 time_t now; /* the current time of day */ 76 int ttywidth; /* width of tty */ 77 int argwidth; /* width of tty */ 78 int header = 1; /* true if -h flag: don't print heading */ 79 int nflag = 1; /* true if -n flag: don't convert addrs */ 80 int sortidle; /* sort by idle time */ 81 char *sel_user; /* login of particular user selected */ 82 char domain[MAXHOSTNAMELEN]; 83 84 #define NAME_WIDTH 8 85 #define HOST_WIDTH 16 86 87 /* 88 * One of these per active utmp entry. 89 */ 90 struct entry { 91 struct entry *next; 92 struct utmp utmp; 93 dev_t tdev; /* dev_t of terminal */ 94 time_t idle; /* idle time of terminal in seconds */ 95 struct kinfo_proc *kp; /* `most interesting' proc */ 96 } *ep, *ehead = NULL, **nextp = &ehead; 97 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[MAXHOSTNAMELEN], 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 (nlistf == NULL && memf == NULL) { 161 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES, 162 errbuf)) == NULL) 163 errx(1, "%s", errbuf); 164 } else { 165 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL) 166 errx(1, "%s", errbuf); 167 } 168 169 (void)time(&now); 170 if ((ut = fopen(_PATH_UTMP, "r")) == NULL) 171 err(1, "%s", _PATH_UTMP); 172 173 if (*argv) 174 sel_user = *argv; 175 176 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) { 177 if (utmp.ut_name[0] == '\0') 178 continue; 179 ++nusers; 180 if (wcmd == 0 || (sel_user && 181 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0)) 182 continue; 183 if ((ep = calloc(1, sizeof(*ep))) == NULL) 184 err(1, NULL); 185 *nextp = ep; 186 nextp = &(ep->next); 187 memcpy(&(ep->utmp), &utmp, sizeof(utmp)); 188 if (!(stp = ttystat(ep->utmp.ut_line))) 189 continue; 190 ep->tdev = stp->st_rdev; 191 192 /* 193 * If this is the console device, attempt to ascertain 194 * the true console device dev_t. 195 */ 196 if (ep->tdev == 0) { 197 int mib[2]; 198 size_t size; 199 200 mib[0] = CTL_KERN; 201 mib[1] = KERN_CONSDEV; 202 size = sizeof(dev_t); 203 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0); 204 } 205 206 if ((ep->idle = now - stp->st_atime) < 0) 207 ep->idle = 0; 208 } 209 (void)fclose(ut); 210 211 if (header || wcmd == 0) { 212 pr_header(&now, nusers); 213 if (wcmd == 0) 214 exit (0); 215 } 216 217 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT" 218 #define WUSED (sizeof(HEADER) - sizeof("WHAT")) 219 (void)puts(HEADER); 220 221 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries); 222 if (kp == NULL) 223 errx(1, "%s", kvm_geterr(kd)); 224 for (i = 0; i < nentries; i++, kp++) { 225 if (kp->p_stat == SIDL || kp->p_stat == SZOMB) 226 continue; 227 for (ep = ehead; ep != NULL; ep = ep->next) { 228 /* ftp is a special case. */ 229 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) { 230 char pidstr[UT_LINESIZE-2]; 231 pid_t fp; 232 233 (void)strncpy(pidstr, &ep->utmp.ut_line[3], 234 sizeof(pidstr) - 1); 235 pidstr[sizeof(pidstr) - 1] = '\0'; 236 fp = (pid_t)strtol(pidstr, NULL, 10); 237 if (kp->p_pid == fp) { 238 ep->kp = kp; 239 break; 240 } 241 } else if (ep->tdev == kp->p_tdev && 242 kp->p__pgid == kp->p_tpgid) { 243 /* 244 * Proc is in foreground of this terminal 245 */ 246 if (proc_compare(ep->kp, kp)) 247 ep->kp = kp; 248 break; 249 } 250 } 251 } 252 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 && 253 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 && 254 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0) 255 ttywidth = 79; 256 else 257 ttywidth = ws.ws_col - 1; 258 argwidth = ttywidth - WUSED; 259 if (argwidth < 4) 260 argwidth = 8; 261 /* sort by idle time */ 262 if (sortidle && ehead != NULL) { 263 struct entry *from = ehead, *save; 264 265 ehead = NULL; 266 while (from != NULL) { 267 for (nextp = &ehead; 268 (*nextp) && from->idle >= (*nextp)->idle; 269 nextp = &(*nextp)->next) 270 continue; 271 save = from; 272 from = from->next; 273 save->next = *nextp; 274 *nextp = save; 275 } 276 } 277 278 if (!nflag) { 279 if (gethostname(domain, sizeof(domain)) < 0 || 280 (p = strchr(domain, '.')) == 0) 281 domain[0] = '\0'; 282 else { 283 domain[sizeof(domain) - 1] = '\0'; 284 memmove(domain, p, strlen(p) + 1); 285 } 286 } 287 288 for (ep = ehead; ep != NULL; ep = ep->next) { 289 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-"; 290 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) 291 if (p[i] == ':') { 292 x = &p[i]; 293 *x++ = '\0'; 294 break; 295 } 296 if (!nflag && inet_aton(p, &addr) && 297 (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) { 298 if (domain[0] != '\0') { 299 p = hp->h_name; 300 p += strlen(hp->h_name); 301 p -= strlen(domain); 302 if (p > hp->h_name && 303 strcasecmp(p, domain) == 0) 304 *p = '\0'; 305 } 306 p = hp->h_name; 307 } 308 if (x) { 309 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p, 310 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x); 311 p = buf; 312 } 313 (void)printf("%-*.*s %-2.2s %-*.*s ", 314 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name, 315 strncmp(ep->utmp.ut_line, "tty", 3) ? 316 ep->utmp.ut_line : ep->utmp.ut_line + 3, 317 HOST_WIDTH, HOST_WIDTH, *p ? p : "-"); 318 pr_attime(&ep->utmp.ut_time, &now); 319 pr_idle(ep->idle); 320 pr_args(ep->kp); 321 printf("\n"); 322 } 323 exit(0); 324 } 325 326 static void 327 pr_args(struct kinfo_proc *kp) 328 { 329 char **argv, *str; 330 int left; 331 332 if (kp == NULL) 333 goto nothing; /* XXX - can this happen? */ 334 left = argwidth; 335 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */ 336 if (argv == NULL) 337 goto nothing; 338 339 if (*argv == NULL || **argv == '\0') { 340 /* Process has zeroed argv[0], display executable name. */ 341 fmt_putc('(', &left); 342 fmt_puts(kp->p_comm, &left); 343 fmt_putc(')', &left); 344 } 345 while (*argv) { 346 /* 347 * ftp argv[0] is in the following format: 348 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd) 349 */ 350 if (strncmp(*argv, "ftpd:", 5) == 0) { 351 if ((str = strchr(*argv + 5, ':')) != NULL) 352 str = strchr(str + 1, ':'); 353 if (str != NULL) { 354 if ((str[0] == ':') && isspace(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 looking 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,", 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