usr.bin/w/w.c

   1 /*-
   2  * Copyright (c) 1980, 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifndef lint
  39 static const char copyright[] =
  40 "@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif
  43
  44 #ifndef lint
  45 static const char sccsid[] = "@(#)w.c   8.4 (Berkeley) 4/16/94";
  46 #endif
  47
  48 /*
  49  * w - print system status (who and what)
  50  *
  51  * This program is similar to the systat command on Tenex/Tops 10/20
  52  *
  53  */
  54 #include <sys/param.h>
  55 #include <sys/time.h>
  56 #include <sys/stat.h>
  57 #include <sys/sysctl.h>
  58 #include <sys/proc.h>
  59 #include <sys/user.h>
  60 #include <sys/ioctl.h>
  61 #include <sys/socket.h>
  62 #include <sys/tty.h>
  63
  64 #include <machine/cpu.h>
  65 #include <netinet/in.h>
  66 #include <arpa/inet.h>
  67 #include <arpa/nameser.h>
  68
  69 #include <ctype.h>
  70 #include <err.h>
  71 #include <errno.h>
  72 #include <fcntl.h>
  73 #include <kvm.h>
  74 #include <langinfo.h>
  75 #include <libutil.h>
  76 #include <limits.h>
  77 #include <locale.h>
  78 #include <netdb.h>
  79 #include <nlist.h>
  80 #include <paths.h>
  81 #include <resolv.h>
  82 #include <stdio.h>
  83 #include <stdlib.h>
  84 #include <string.h>
  85 #include <timeconv.h>
  86 #include <unistd.h>
  87 #include <utmp.h>
  88 #include <vis.h>
  89
  90 #include "extern.h"
  91
  92 struct timeval  boottime;
  93 struct utmp     utmp;
  94 struct winsize  ws;
  95 kvm_t          *kd;
  96 time_t          now;            /* the current time of day */
  97 int             ttywidth;       /* width of tty */
  98 int             argwidth;       /* width of tty */
  99 int             header = 1;     /* true if -h flag: don't print heading */
 100 int             nflag;          /* true if -n flag: don't convert addrs */
 101 int             dflag;          /* true if -d flag: output debug info */
 102 int             sortidle;       /* sort by idle time */
 103 int             use_ampm;       /* use AM/PM time */
 104 int             use_comma;      /* use comma as floats separator */
 105 char          **sel_users;      /* login array of particular users selected */
 106
 107 /*
 108  * One of these per active utmp entry.
 109  */
 110 struct  entry {
 111         struct  entry *next;
 112         struct  utmp utmp;
 113         dev_t   tdev;                   /* dev_t of terminal */
 114         time_t  idle;                   /* idle time of terminal in seconds */
 115         struct  kinfo_proc *kp;         /* `most interesting' proc */
 116         char    *args;                  /* arg list of interesting process */
 117         struct  kinfo_proc *dkp;        /* debug option proc list */
 118 } *ep, *ehead = NULL, **nextp = &ehead;
 119
 120 #define debugproc(p) *((struct kinfo_proc **)&(p)->ki_udata)
 121
 122 /* W_DISPHOSTSIZE should not be greater than UT_HOSTSIZE */
 123 #define W_DISPHOSTSIZE  16
 124
 125 static void              pr_header(time_t *, int);
 126 static struct stat      *ttystat(char *, int);
 127 static void              usage(int);
 128 static int               this_is_uptime(const char *s);
 129
 130 char *fmt_argv(char **, char *, int);   /* ../../bin/ps/fmt.c */
 131
 132 int
 133 main(int argc, char *argv[])
 134 {
 135         struct kinfo_proc *kp;
 136         struct kinfo_proc *dkp;
 137         struct stat *stp;
 138         FILE *ut;
 139         time_t touched;
 140         int ch, i, nentries, nusers, wcmd, longidle, dropgid;
 141         const char *memf, *nlistf, *p;
 142         char *x_suffix;
 143         char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
 144         char fn[MAXHOSTNAMELEN];
 145         char *dot;
 146
 147         (void)setlocale(LC_ALL, "");
 148         use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
 149         use_comma = (*nl_langinfo(RADIXCHAR) != ',');
 150
 151         /* Are we w(1) or uptime(1)? */
 152         if (this_is_uptime(argv[0]) == 0) {
 153                 wcmd = 0;
 154                 p = "";
 155         } else {
 156                 wcmd = 1;
 157                 p = "dhiflM:N:nsuw";
 158         }
 159
 160         dropgid = 0;
 161         memf = nlistf = _PATH_DEVNULL;
 162         while ((ch = getopt(argc, argv, p)) != -1)
 163                 switch (ch) {
 164                 case 'd':
 165                         dflag = 1;
 166                         break;
 167                 case 'h':
 168                         header = 0;
 169                         break;
 170                 case 'i':
 171                         sortidle = 1;
 172                         break;
 173                 case 'M':
 174                         header = 0;
 175                         memf = optarg;
 176                         dropgid = 1;
 177                         break;
 178                 case 'N':
 179                         nlistf = optarg;
 180                         dropgid = 1;
 181                         break;
 182                 case 'n':
 183                         nflag = 1;
 184                         break;
 185                 case 'f': case 'l': case 's': case 'u': case 'w':
 186                         warnx("[-flsuw] no longer supported");
 187                         /* FALLTHROUGH */
 188                 case '?':
 189                 default:
 190                         usage(wcmd);
 191                 }
 192         argc -= optind;
 193         argv += optind;
 194
 195         if (!(_res.options & RES_INIT))
 196                 res_init();
 197         _res.retrans = 2;       /* resolver timeout to 2 seconds per try */
 198         _res.retry = 1;         /* only try once.. */
 199
 200         /*
 201          * Discard setgid privileges if not the running kernel so that bad
 202          * guys can't print interesting stuff from kernel memory.
 203          */
 204         if (dropgid)
 205                 setgid(getgid());
 206
 207         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 208                 errx(1, "%s", errbuf);
 209
 210         (void)time(&now);
 211         if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
 212                 err(1, "%s", _PATH_UTMP);
 213
 214         if (*argv)
 215                 sel_users = argv;
 216
 217         for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
 218                 if (utmp.ut_name[0] == '\0')
 219                         continue;
 220                 if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
 221                         continue;       /* corrupted record */
 222                 ++nusers;
 223                 if (wcmd == 0)
 224                         continue;
 225                 if (sel_users) {
 226                         int usermatch;
 227                         char **user;
 228
 229                         usermatch = 0;
 230                         for (user = sel_users; !usermatch && *user; user++)
 231                                 if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
 232                                         usermatch = 1;
 233                         if (!usermatch)
 234                                 continue;
 235                 }
 236                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 237                         errx(1, "calloc");
 238                 *nextp = ep;
 239                 nextp = &ep->next;
 240                 memmove(&ep->utmp, &utmp, sizeof(struct utmp));
 241                 ep->tdev = stp->st_rdev;
 242                 /*
 243                  * If this is the console device, attempt to ascertain
 244                  * the true console device dev_t.
 245                  */
 246                 if (ep->tdev == 0) {
 247                         size_t size;
 248
 249                         size = sizeof(dev_t);
 250                         (void)sysctlbyname("machdep.consdev", &ep->tdev, &size, NULL, 0);
 251                 }
 252                 touched = stp->st_atime;
 253                 if (touched < ep->utmp.ut_time) {
 254                         /* tty untouched since before login */
 255                         touched = ep->utmp.ut_time;
 256                 }
 257                 if ((ep->idle = now - touched) < 0)
 258                         ep->idle = 0;
 259         }
 260         (void)fclose(ut);
 261
 262         if (header || wcmd == 0) {
 263                 pr_header(&now, nusers);
 264                 if (wcmd == 0) {
 265                         (void)kvm_close(kd);
 266                         exit(0);
 267                 }
 268
 269 #define HEADER_USER             "USER"
 270 #define HEADER_TTY              "TTY"
 271 #define HEADER_FROM             "FROM"
 272 #define HEADER_LOGIN_IDLE       "LOGIN@  IDLE "
 273 #define HEADER_WHAT             "WHAT\n"
 274 #define WUSED  (UT_NAMESIZE + UT_LINESIZE + W_DISPHOSTSIZE + \
 275                 sizeof(HEADER_LOGIN_IDLE) + 3)  /* header width incl. spaces */
 276                 (void)printf("%-*.*s %-*.*s %-*.*s  %s",
 277                                 UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
 278                                 UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
 279                                 W_DISPHOSTSIZE, W_DISPHOSTSIZE, HEADER_FROM,
 280                                 HEADER_LOGIN_IDLE HEADER_WHAT);
 281         }
 282
 283         if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
 284                 err(1, "%s", kvm_geterr(kd));
 285         for (i = 0; i < nentries; i++, kp++) {
 286                 if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB)
 287                         continue;
 288                 for (ep = ehead; ep != NULL; ep = ep->next) {
 289                         if (ep->tdev == kp->ki_tdev) {
 290                                 /*
 291                                  * proc is associated with this terminal
 292                                  */
 293                                 if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
 294                                         /*
 295                                          * Proc is 'most interesting'
 296                                          */
 297                                         if (proc_compare(ep->kp, kp))
 298                                                 ep->kp = kp;
 299                                 }
 300                                 /*
 301                                  * Proc debug option info; add to debug
 302                                  * list using kinfo_proc ki_spare[0]
 303                                  * as next pointer; ptr to ptr avoids the
 304                                  * ptr = long assumption.
 305                                  */
 306                                 dkp = ep->dkp;
 307                                 ep->dkp = kp;
 308                                 debugproc(kp) = dkp;
 309                         }
 310                 }
 311         }
 312         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
 313              ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
 314              ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
 315                ttywidth = 79;
 316         else
 317                ttywidth = ws.ws_col - 1;
 318         argwidth = ttywidth - WUSED;
 319         if (argwidth < 4)
 320                 argwidth = 8;
 321         for (ep = ehead; ep != NULL; ep = ep->next) {
 322                 if (ep->kp == NULL) {
 323                         ep->args = strdup("-");
 324                         continue;
 325                 }
 326                 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
 327                     ep->kp->ki_comm, MAXCOMLEN);
 328                 if (ep->args == NULL)
 329                         err(1, NULL);
 330         }
 331         /* sort by idle time */
 332         if (sortidle && ehead != NULL) {
 333                 struct entry *from, *save;
 334
 335                 from = ehead;
 336                 ehead = NULL;
 337                 while (from != NULL) {
 338                         for (nextp = &ehead;
 339                             (*nextp) && from->idle >= (*nextp)->idle;
 340                             nextp = &(*nextp)->next)
 341                                 continue;
 342                         save = from;
 343                         from = from->next;
 344                         save->next = *nextp;
 345                         *nextp = save;
 346                 }
 347         }
 348
 349         for (ep = ehead; ep != NULL; ep = ep->next) {
 350                 char host_buf[UT_HOSTSIZE + 1];
 351                 struct sockaddr_storage ss;
 352                 struct sockaddr *sa = (struct sockaddr *)&ss;
 353                 struct sockaddr_in *lsin = (struct sockaddr_in *)&ss;
 354                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)&ss;
 355                 time_t t;
 356                 int isaddr;
 357
 358                 host_buf[UT_HOSTSIZE] = '\0';
 359                 strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
 360                 p = *host_buf ? host_buf : "-";
 361                 if ((x_suffix = strrchr(p, ':')) != NULL) {
 362                         if ((dot = strchr(x_suffix, '.')) != NULL &&
 363                             strchr(dot+1, '.') == NULL)
 364                                 *x_suffix++ = '\0';
 365                         else
 366                                 x_suffix = NULL;
 367                 }
 368                 if (!nflag) {
 369                         /* Attempt to change an IP address into a name */
 370                         isaddr = 0;
 371                         memset(&ss, '\0', sizeof(ss));
 372                         if (inet_pton(AF_INET6, p, &lsin6->sin6_addr) == 1) {
 373                                 lsin6->sin6_len = sizeof(*lsin6);
 374                                 lsin6->sin6_family = AF_INET6;
 375                                 isaddr = 1;
 376                         } else if (inet_pton(AF_INET, p, &lsin->sin_addr) == 1) {
 377                                 lsin->sin_len = sizeof(*lsin);
 378                                 lsin->sin_family = AF_INET;
 379                                 isaddr = 1;
 380                         }
 381                         if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
 382                             sa->sa_len) == HOSTNAME_FOUND)
 383                                 p = fn;
 384                 }
 385                 if (x_suffix) {
 386                         (void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
 387                         p = buf;
 388                 }
 389                 if (dflag) {
 390                         for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
 391                                 const char *ptr;
 392
 393                                 ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
 394                                     dkp->ki_comm, MAXCOMLEN);
 395                                 if (ptr == NULL)
 396                                         ptr = "-";
 397                                 (void)printf("\t\t%-9d %s\n",
 398                                     dkp->ki_pid, ptr);
 399                         }
 400                 }
 401                 (void)printf("%-*.*s %-*.*s %-*.*s ",
 402                     UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
 403                     UT_LINESIZE, UT_LINESIZE,
 404                     strncmp(ep->utmp.ut_line, "tty", 3) &&
 405                     strncmp(ep->utmp.ut_line, "cua", 3) ?
 406                     ep->utmp.ut_line : ep->utmp.ut_line + 3,
 407                     W_DISPHOSTSIZE, W_DISPHOSTSIZE, *p ? p : "-");
 408                 t = _time_to_time32(ep->utmp.ut_time);
 409                 pr_attime(&t, &now);
 410                 longidle = pr_idle(ep->idle);
 411                 (void)printf("%.*s\n", argwidth - longidle, ep->args);
 412         }
 413         (void)kvm_close(kd);
 414         exit(0);
 415 }
 416
 417 static void
 418 pr_header(time_t *nowp, int nusers)
 419 {
 420         double avenrun[3];
 421         time_t uptime;
 422         struct timespec tp;
 423         int days, hrs, i, mins, secs;
 424         char buf[256];
 425
 426         /*
 427          * Print time of day.
 428          */
 429         if (strftime(buf, sizeof(buf),
 430             use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)) != 0)
 431                 (void)printf("%s ", buf);
 432         /*
 433          * Print how long system has been up.
 434          */
 435         if (clock_gettime(CLOCK_MONOTONIC, &tp) != -1) {
 436                 uptime = tp.tv_sec;
 437                 if (uptime > 60)
 438                         uptime += 30;
 439                 days = uptime / 86400;
 440                 uptime %= 86400;
 441                 hrs = uptime / 3600;
 442                 uptime %= 3600;
 443                 mins = uptime / 60;
 444                 secs = uptime % 60;
 445                 (void)printf(" up");
 446                 if (days > 0)
 447                         (void)printf(" %d day%s,", days, days > 1 ? "s" : "");
 448                 if (hrs > 0 && mins > 0)
 449                         (void)printf(" %2d:%02d,", hrs, mins);
 450                 else if (hrs > 0)
 451                         (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
 452                 else if (mins > 0)
 453                         (void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
 454                 else
 455                         (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
 456         }
 457
 458         /* Print number of users logged in to system */
 459         (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
 460
 461         /*
 462          * Print 1, 5, and 15 minute load averages.
 463          */
 464         if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
 465                 (void)printf(", no load average information available\n");
 466         else {
 467                 (void)printf(", load averages:");
 468                 for (i = 0; i < (int)(sizeof(avenrun) / sizeof(avenrun[0])); i++) {
 469                         if (use_comma && i > 0)
 470                                 (void)printf(",");
 471                         (void)printf(" %.2f", avenrun[i]);
 472                 }
 473                 (void)printf("\n");
 474         }
 475 }
 476
 477 static struct stat *
 478 ttystat(char *line, int sz)
 479 {
 480         static struct stat sb;
 481         char ttybuf[MAXPATHLEN];
 482
 483         (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
 484         if (stat(ttybuf, &sb) == 0) {
 485                 return (&sb);
 486         } else
 487                 return (NULL);
 488 }
 489
 490 static void
 491 usage(int wcmd)
 492 {
 493         if (wcmd)
 494                 (void)fprintf(stderr,
 495                     "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
 496         else
 497                 (void)fprintf(stderr, "usage: uptime\n");
 498         exit(1);
 499 }
 500
 501 static int
 502 this_is_uptime(const char *s)
 503 {
 504         const char *u;
 505
 506         if ((u = strrchr(s, '/')) != NULL)
 507                 ++u;
 508         else
 509                 u = s;
 510         if (strcmp(u, "uptime") == 0)
 511                 return (0);
 512         return (-1);
 513 }