w/w.c

   1 /*      $NetBSD: w.c,v 1.30 1998/07/06 07:50:20 mrg 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 1.30 1998/07/06 07:50:20 mrg 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 <machine/cpu.h>
  66 #include <netinet/in.h>
  67 #include <arpa/inet.h>
  68
  69 #include <ctype.h>
  70 #include <err.h>
  71 #include <errno.h>
  72 #include <fcntl.h>
  73 #include <kvm.h>
  74 #include <limits.h>
  75 #include <netdb.h>
  76 #include <nlist.h>
  77 #include <paths.h>
  78 #include <stdio.h>
  79 #include <stdlib.h>
  80 #include <string.h>
  81 #include <time.h>
  82 #include <tzfile.h>
  83 #include <unistd.h>
  84 #include <utmp.h>
  85 #include <vis.h>
  86
  87 #include "extern.h"
  88
  89 struct timeval  boottime;
  90 struct utmp     utmp;
  91 struct winsize  ws;
  92 kvm_t          *kd;
  93 time_t          now;            /* the current time of day */
  94 time_t          uptime;         /* time of last reboot & elapsed time since */
  95 int             ttywidth;       /* width of tty */
  96 int             argwidth;       /* width of tty */
  97 int             header = 1;     /* true if -h flag: don't print heading */
  98 int             nflag;          /* true if -n flag: don't convert addrs */
  99 int             sortidle;       /* sort bu idle time */
 100 char           *sel_user;       /* login of particular user selected */
 101 char            domain[MAXHOSTNAMELEN + 1];
 102
 103 /*
 104  * One of these per active utmp entry.
 105  */
 106 struct  entry {
 107         struct  entry *next;
 108         struct  utmp utmp;
 109         dev_t   tdev;           /* dev_t of terminal */
 110         time_t  idle;           /* idle time of terminal in seconds */
 111         struct  kinfo_proc *kp; /* `most interesting' proc */
 112 } *ep, *ehead = NULL, **nextp = &ehead;
 113
 114 static void      pr_args __P((struct kinfo_proc *));
 115 static void      pr_header __P((time_t *, int));
 116 static struct stat
 117                 *ttystat __P((char *));
 118 static void      usage __P((int));
 119 int     main __P((int, char **));
 120
 121 int
 122 main(argc, argv)
 123         int argc;
 124         char **argv;
 125 {
 126         extern char *__progname;
 127         struct kinfo_proc *kp;
 128         struct hostent *hp;
 129         struct stat *stp;
 130         FILE *ut;
 131         struct in_addr l;
 132         int ch, i, nentries, nusers, wcmd;
 133         gid_t egid = getegid();
 134         char *memf, *nlistf, *p, *x;
 135         char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
 136
 137         (void)setegid(getgid());
 138
 139         /* Are we w(1) or uptime(1)? */
 140         p = __progname;
 141         if (*p == '-')
 142                 p++;
 143         if (*p == 'u') {
 144                 wcmd = 0;
 145                 p = "";
 146         } else {
 147                 wcmd = 1;
 148                 p = "hiflM:N:nsuw";
 149         }
 150
 151         memf = nlistf = NULL;
 152         while ((ch = getopt(argc, argv, p)) != -1)
 153                 switch (ch) {
 154                 case 'h':
 155                         header = 0;
 156                         break;
 157                 case 'i':
 158                         sortidle = 1;
 159                         break;
 160                 case 'M':
 161                         header = 0;
 162                         memf = optarg;
 163                         break;
 164                 case 'N':
 165                         nlistf = optarg;
 166                         break;
 167                 case 'n':
 168                         nflag = 1;
 169                         break;
 170                 case 'f': case 'l': case 's': case 'u': case 'w':
 171                         warnx("[-flsuw] no longer supported");
 172                         /* FALLTHROUGH */
 173                 case '?':
 174                 default:
 175                         usage(wcmd);
 176                 }
 177         argc -= optind;
 178         argv += optind;
 179
 180         /*
 181          * Discard setgid privileges.  If not the running kernel, we toss
 182          * them away totally so that bad guys can't print interesting stuff
 183          * from kernel memory, otherwise switch back to kmem for the
 184          * duration of the kvm_openfiles() call.
 185          */
 186         if (nlistf != NULL || memf != NULL)
 187                 (void)setgid(getgid());
 188         else
 189                 (void)setegid(egid);
 190
 191         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 192                 errx(1, "%s", errbuf);
 193
 194         /* get rid of it now anyway */
 195         if (nlistf == NULL && memf == NULL)
 196                 (void)setgid(getgid());
 197
 198         (void)time(&now);
 199         if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
 200                 err(1, "%s", _PATH_UTMP);
 201
 202         if (*argv)
 203                 sel_user = *argv;
 204
 205         for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
 206                 if (utmp.ut_name[0] == '\0')
 207                         continue;
 208                 ++nusers;
 209                 if (wcmd == 0 || (sel_user &&
 210                     strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
 211                         continue;
 212                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 213                         err(1, "%s", "");
 214                 *nextp = ep;
 215                 nextp = &(ep->next);
 216                 memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
 217                 if (!(stp = ttystat(ep->utmp.ut_line)))
 218                         continue;
 219                 ep->tdev = stp->st_rdev;
 220 #ifdef CPU_CONSDEV
 221                 /*
 222                  * If this is the console device, attempt to ascertain
 223                  * the true console device dev_t.
 224                  */
 225                 if (ep->tdev == 0) {
 226                         int mib[2];
 227                         size_t size;
 228
 229                         mib[0] = CTL_MACHDEP;
 230                         mib[1] = CPU_CONSDEV;
 231                         size = sizeof(dev_t);
 232                         (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
 233                 }
 234 #endif
 235                 if ((ep->idle = now - stp->st_atime) < 0)
 236                         ep->idle = 0;
 237         }
 238         (void)fclose(ut);
 239
 240         if (header || wcmd == 0) {
 241                 pr_header(&now, nusers);
 242                 if (wcmd == 0)
 243                         exit (0);
 244         }
 245
 246 #define HEADER  "USER    TTY FROM              LOGIN@  IDLE WHAT\n"
 247 #define WUSED   (sizeof (HEADER) - sizeof ("WHAT\n"))
 248         (void)printf(HEADER);
 249
 250         if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
 251                 errx(1, "%s", kvm_geterr(kd));
 252         for (i = 0; i < nentries; i++, kp++) {
 253 #ifdef __APPLE__
 254                 struct proc *p = (struct proc *)&kp->kp_proc;
 255 #else
 256                 struct proc *p = &kp->kp_proc;
 257 #endif
 258                 struct eproc *e;
 259
 260                 if (p->p_stat == SIDL || p->p_stat == SZOMB)
 261                         continue;
 262                 e = &kp->kp_eproc;
 263                 for (ep = ehead; ep != NULL; ep = ep->next) {
 264                         if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) {
 265                                 /*
 266                                  * Proc is in foreground of this terminal
 267                                  */
 268 #ifdef __APPLE__
 269                                 if (proc_compare((struct proc *)&ep->kp->kp_proc, p))
 270 #else
 271                                 if (proc_compare(&ep->kp->kp_proc, p))
 272 #endif
 273                                         ep->kp = kp;
 274                                 break;
 275                         }
 276                 }
 277         }
 278         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
 279              ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
 280              ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
 281                ttywidth = 79;
 282         else
 283                ttywidth = ws.ws_col - 1;
 284         argwidth = ttywidth - WUSED;
 285         if (argwidth < 4)
 286                 argwidth = 8;
 287         /* sort by idle time */
 288         if (sortidle && ehead != NULL) {
 289                 struct entry *from = ehead, *save;
 290
 291                 ehead = NULL;
 292                 while (from != NULL) {
 293                         for (nextp = &ehead;
 294                             (*nextp) && from->idle >= (*nextp)->idle;
 295                             nextp = &(*nextp)->next)
 296                                 continue;
 297                         save = from;
 298                         from = from->next;
 299                         save->next = *nextp;
 300                         *nextp = save;
 301                 }
 302         }
 303
 304         if (!nflag) {
 305                 int     rv;
 306
 307                 rv = gethostname(domain, sizeof(domain));
 308                 domain[sizeof(domain) - 1] = '\0';
 309                 if (rv < 0 || (p = strchr(domain, '.')) == 0)
 310                         domain[0] = '\0';
 311                 else
 312                         memmove(domain, p, strlen(p) + 1);
 313         }
 314
 315         for (ep = ehead; ep != NULL; ep = ep->next) {
 316                 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
 317                 for (x = p; x < p + UT_HOSTSIZE; x++)
 318                         if (*x == '\0' || *x == ':')
 319                                 break;
 320                 if (x == p + UT_HOSTSIZE || *x != ':')
 321                         x = NULL;
 322                 else
 323                         *x++ = '\0';
 324
 325                 if (!nflag && inet_aton(p, &l) &&
 326                     (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
 327                         if (domain[0] != '\0') {
 328                                 p = hp->h_name;
 329                                 p += strlen(hp->h_name);
 330                                 p -= strlen(domain);
 331                                 if (p > hp->h_name && strcmp(p, domain) == 0)
 332                                         *p = '\0';
 333                         }
 334                         p = hp->h_name;
 335                 }
 336                 if (x) {
 337                         (void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
 338                             (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x);
 339                         p = buf;
 340                 }
 341                 (void)printf("%-*.*s %-2.2s %-*.*s ",
 342                     UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
 343                     strncmp(ep->utmp.ut_line, "tty", 3) ?
 344                     ep->utmp.ut_line : ep->utmp.ut_line + 3,
 345                     UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
 346                 pr_attime(&ep->utmp.ut_time, &now);
 347                 pr_idle(ep->idle);
 348                 pr_args(ep->kp);
 349                 printf("\n");
 350         }
 351         exit(0);
 352 }
 353
 354 static void
 355 pr_args(kp)
 356         struct kinfo_proc *kp;
 357 {
 358         char **argv;
 359         int left;
 360
 361         if (kp == 0)
 362                 goto nothing;
 363         left = argwidth;
 364         argv = kvm_getargv(kd, kp, argwidth);
 365         if (argv == 0)
 366                 goto nothing;
 367         while (*argv) {
 368                 fmt_puts(*argv, &left);
 369                 argv++;
 370                 fmt_putc(' ', &left);
 371         }
 372         return;
 373 nothing:
 374         putchar('-');
 375 }
 376
 377 static void
 378 pr_header(nowp, nusers)
 379         time_t *nowp;
 380         int nusers;
 381 {
 382         double avenrun[3];
 383         time_t uptime;
 384         int days, hrs, i, mins;
 385         int mib[2];
 386         size_t size;
 387         char buf[256];
 388
 389         /*
 390          * Print time of day.
 391          *
 392          * SCCS forces the string manipulation below, as it replaces
 393          * %, M, and % in a character string with the file name.
 394          */
 395         (void)strftime(buf, sizeof(buf),
 396             __CONCAT("%l:%","M%p"), localtime(nowp));
 397         buf[sizeof(buf) - 1] = '\0';
 398         (void)printf("%s ", buf);
 399
 400         /*
 401          * Print how long system has been up.
 402          * (Found by looking getting "boottime" from the kernel)
 403          */
 404         mib[0] = CTL_KERN;
 405         mib[1] = KERN_BOOTTIME;
 406         size = sizeof(boottime);
 407         if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
 408             boottime.tv_sec != 0) {
 409                 uptime = now - boottime.tv_sec;
 410                 uptime += 30;
 411                 if (uptime > SECSPERMIN) {
 412                         days = uptime / SECSPERDAY;
 413                         uptime %= SECSPERDAY;
 414                         hrs = uptime / SECSPERHOUR;
 415                         uptime %= SECSPERHOUR;
 416                         mins = uptime / SECSPERMIN;
 417                         (void)printf(" up");
 418                         if (days > 0)
 419                                 (void)printf(" %d day%s,", days,
 420                                     days > 1 ? "s" : "");
 421                         if (hrs > 0 && mins > 0)
 422                                 (void)printf(" %2d:%02d,", hrs, mins);
 423                         else {
 424                                 if (hrs > 0)
 425                                         (void)printf(" %d hr%s,",
 426                                             hrs, hrs > 1 ? "s" : "");
 427                                 if (mins > 0)
 428                                         (void)printf(" %d min%s,",
 429                                             mins, mins > 1 ? "s" : "");
 430                         }
 431                 }
 432         }
 433
 434         /* Print number of users logged in to system */
 435         (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
 436
 437         /*
 438          * Print 1, 5, and 15 minute load averages.
 439          */
 440         if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
 441                 (void)printf(", no load average information available\n");
 442         else {
 443                 (void)printf(", load averages:");
 444                 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
 445                         if (i > 0)
 446                                 (void)printf(",");
 447                         (void)printf(" %.2f", avenrun[i]);
 448                 }
 449                 (void)printf("\n");
 450         }
 451 }
 452
 453 static struct stat *
 454 ttystat(line)
 455         char *line;
 456 {
 457         static struct stat sb;
 458         char ttybuf[MAXPATHLEN];
 459
 460         (void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
 461         if (stat(ttybuf, &sb))
 462                 return (NULL);
 463         return (&sb);
 464 }
 465
 466 static void
 467 usage(wcmd)
 468         int wcmd;
 469 {
 470         if (wcmd)
 471                 (void)fprintf(stderr,
 472                     "usage: w: [-hin] [-M core] [-N system] [user]\n");
 473         else
 474                 (void)fprintf(stderr, "uptime\n");
 475         exit(1);
 476 }