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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31
  32 __FBSDID("$FreeBSD$");
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif
  39
  40 #ifndef lint
  41 static const char sccsid[] = "@(#)w.c   8.4 (Berkeley) 4/16/94";
  42 #endif
  43
  44 /*
  45  * w - print system status (who and what)
  46  *
  47  * This program is similar to the systat command on Tenex/Tops 10/20
  48  *
  49  */
  50 #include <sys/param.h>
  51 #include <sys/time.h>
  52 #include <sys/stat.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/proc.h>
  55 #include <sys/user.h>
  56 #include <sys/ioctl.h>
  57 #include <sys/sbuf.h>
  58 #include <sys/socket.h>
  59 #include <sys/tty.h>
  60 #include <sys/types.h>
  61
  62 #include <machine/cpu.h>
  63 #include <netinet/in.h>
  64 #include <arpa/inet.h>
  65 #include <arpa/nameser.h>
  66
  67 #include <ctype.h>
  68 #include <err.h>
  69 #include <errno.h>
  70 #include <fcntl.h>
  71 #include <kvm.h>
  72 #include <langinfo.h>
  73 #include <libgen.h>
  74 #include <libutil.h>
  75 #include <limits.h>
  76 #include <locale.h>
  77 #include <netdb.h>
  78 #include <nlist.h>
  79 #include <paths.h>
  80 #include <resolv.h>
  81 #include <stdio.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <timeconv.h>
  85 #include <unistd.h>
  86 #include <utmpx.h>
  87 #include <vis.h>
  88 #include <libxo/xo.h>
  89
  90 #include "extern.h"
  91
  92 static struct utmpx *utmp;
  93 static struct winsize ws;
  94 static kvm_t   *kd;
  95 static time_t   now;            /* the current time of day */
  96 static int      ttywidth;       /* width of tty */
  97 static int      argwidth;       /* width of tty */
  98 static int      header = 1;     /* true if -h flag: don't print heading */
  99 static int      nflag;          /* true if -n flag: don't convert addrs */
 100 static int      dflag;          /* true if -d flag: output debug info */
 101 static int      sortidle;       /* sort by idle time */
 102 int             use_ampm;       /* use AM/PM time */
 103 static int      use_comma;      /* use comma as floats separator */
 104 static char   **sel_users;      /* login array of particular users selected */
 105
 106 /*
 107  * One of these per active utmp entry.
 108  */
 109 static struct entry {
 110         struct  entry *next;
 111         struct  utmpx utmp;
 112         dev_t   tdev;                   /* dev_t of terminal */
 113         time_t  idle;                   /* idle time of terminal in seconds */
 114         struct  kinfo_proc *kp;         /* `most interesting' proc */
 115         char    *args;                  /* arg list of interesting process */
 116         struct  kinfo_proc *dkp;        /* debug option proc list */
 117 } *ep, *ehead = NULL, **nextp = &ehead;
 118
 119 #define debugproc(p) *(&((struct kinfo_proc *)p)->ki_udata)
 120
 121 #define W_DISPUSERSIZE  10
 122 #define W_DISPLINESIZE  8
 123 #define W_DISPHOSTSIZE  40
 124
 125 static void              pr_header(time_t *, int);
 126 static struct stat      *ttystat(char *);
 127 static void              usage(int);
 128
 129 char *fmt_argv(char **, char *, char *, size_t);        /* ../../bin/ps/fmt.c */
 130
 131 int
 132 main(int argc, char *argv[])
 133 {
 134         struct kinfo_proc *kp;
 135         struct kinfo_proc *dkp;
 136         struct stat *stp;
 137         time_t touched;
 138         int ch, i, nentries, nusers, wcmd, longidle, longattime;
 139         const char *memf, *nlistf, *p, *save_p;
 140         char *x_suffix;
 141         char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
 142         char fn[MAXHOSTNAMELEN];
 143         char *dot;
 144
 145         (void)setlocale(LC_ALL, "");
 146         use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
 147         use_comma = (*nl_langinfo(RADIXCHAR) != ',');
 148
 149         argc = xo_parse_args(argc, argv);
 150         if (argc < 0)
 151                 exit(1);
 152
 153         /* Are we w(1) or uptime(1)? */
 154         if (strcmp(basename(argv[0]), "uptime") == 0) {
 155                 wcmd = 0;
 156                 p = "";
 157         } else {
 158                 wcmd = 1;
 159                 p = "dhiflM:N:nsuw";
 160         }
 161
 162         memf = _PATH_DEVNULL;
 163         nlistf = NULL;
 164         while ((ch = getopt(argc, argv, p)) != -1)
 165                 switch (ch) {
 166                 case 'd':
 167                         dflag = 1;
 168                         break;
 169                 case 'h':
 170                         header = 0;
 171                         break;
 172                 case 'i':
 173                         sortidle = 1;
 174                         break;
 175                 case 'M':
 176                         header = 0;
 177                         memf = optarg;
 178                         break;
 179                 case 'N':
 180                         nlistf = optarg;
 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         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 201                 errx(1, "%s", errbuf);
 202
 203         (void)time(&now);
 204
 205         if (*argv)
 206                 sel_users = argv;
 207
 208         setutxent();
 209         for (nusers = 0; (utmp = getutxent()) != NULL;) {
 210                 if (utmp->ut_type != USER_PROCESS)
 211                         continue;
 212                 if (!(stp = ttystat(utmp->ut_line)))
 213                         continue;       /* corrupted record */
 214                 ++nusers;
 215                 if (wcmd == 0)
 216                         continue;
 217                 if (sel_users) {
 218                         int usermatch;
 219                         char **user;
 220
 221                         usermatch = 0;
 222                         for (user = sel_users; !usermatch && *user; user++)
 223                                 if (!strcmp(utmp->ut_user, *user))
 224                                         usermatch = 1;
 225                         if (!usermatch)
 226                                 continue;
 227                 }
 228                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 229                         errx(1, "calloc");
 230                 *nextp = ep;
 231                 nextp = &ep->next;
 232                 memmove(&ep->utmp, utmp, sizeof *utmp);
 233                 ep->tdev = stp->st_rdev;
 234                 /*
 235                  * If this is the console device, attempt to ascertain
 236                  * the true console device dev_t.
 237                  */
 238                 if (ep->tdev == 0) {
 239                         size_t size;
 240
 241                         size = sizeof(dev_t);
 242                         (void)sysctlbyname("machdep.consdev", &ep->tdev, &size, NULL, 0);
 243                 }
 244                 touched = stp->st_atime;
 245                 if (touched < ep->utmp.ut_tv.tv_sec) {
 246                         /* tty untouched since before login */
 247                         touched = ep->utmp.ut_tv.tv_sec;
 248                 }
 249                 if ((ep->idle = now - touched) < 0)
 250                         ep->idle = 0;
 251         }
 252         endutxent();
 253
 254         xo_open_container("uptime-information");
 255
 256         if (header || wcmd == 0) {
 257                 pr_header(&now, nusers);
 258                 if (wcmd == 0) {
 259                         xo_close_container("uptime-information");
 260                         xo_finish();
 261
 262                         (void)kvm_close(kd);
 263                         exit(0);
 264                 }
 265
 266 #define HEADER_USER             "USER"
 267 #define HEADER_TTY              "TTY"
 268 #define HEADER_FROM             "FROM"
 269 #define HEADER_LOGIN_IDLE       "LOGIN@  IDLE "
 270 #define HEADER_WHAT             "WHAT\n"
 271 #define WUSED  (W_DISPUSERSIZE + W_DISPLINESIZE + W_DISPHOSTSIZE + \
 272                 sizeof(HEADER_LOGIN_IDLE) + 3)  /* header width incl. spaces */
 273                 xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s}  {T:/%s}",
 274                                 W_DISPUSERSIZE, W_DISPUSERSIZE, HEADER_USER,
 275                                 W_DISPLINESIZE, W_DISPLINESIZE, HEADER_TTY,
 276                                 W_DISPHOSTSIZE, W_DISPHOSTSIZE, HEADER_FROM,
 277                                 HEADER_LOGIN_IDLE HEADER_WHAT);
 278         }
 279
 280         if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
 281                 err(1, "%s", kvm_geterr(kd));
 282         for (i = 0; i < nentries; i++, kp++) {
 283                 if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB ||
 284                     kp->ki_tdev == NODEV)
 285                         continue;
 286                 for (ep = ehead; ep != NULL; ep = ep->next) {
 287                         if (ep->tdev == kp->ki_tdev) {
 288                                 /*
 289                                  * proc is associated with this terminal
 290                                  */
 291                                 if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
 292                                         /*
 293                                          * Proc is 'most interesting'
 294                                          */
 295                                         if (proc_compare(ep->kp, kp))
 296                                                 ep->kp = kp;
 297                                 }
 298                                 /*
 299                                  * Proc debug option info; add to debug
 300                                  * list using kinfo_proc ki_spare[0]
 301                                  * as next pointer; ptr to ptr avoids the
 302                                  * ptr = long assumption.
 303                                  */
 304                                 dkp = ep->dkp;
 305                                 ep->dkp = kp;
 306                                 debugproc(kp) = dkp;
 307                         }
 308                 }
 309         }
 310         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
 311              ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
 312              ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
 313                ttywidth = 79;
 314         else
 315                ttywidth = ws.ws_col - 1;
 316         argwidth = ttywidth - WUSED;
 317         if (argwidth < 4)
 318                 argwidth = 8;
 319         for (ep = ehead; ep != NULL; ep = ep->next) {
 320                 if (ep->kp == NULL) {
 321                         ep->args = strdup("-");
 322                         continue;
 323                 }
 324                 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
 325                     ep->kp->ki_comm, NULL, MAXCOMLEN);
 326                 if (ep->args == NULL)
 327                         err(1, NULL);
 328         }
 329         /* sort by idle time */
 330         if (sortidle && ehead != NULL) {
 331                 struct entry *from, *save;
 332
 333                 from = ehead;
 334                 ehead = NULL;
 335                 while (from != NULL) {
 336                         for (nextp = &ehead;
 337                             (*nextp) && from->idle >= (*nextp)->idle;
 338                             nextp = &(*nextp)->next)
 339                                 continue;
 340                         save = from;
 341                         from = from->next;
 342                         save->next = *nextp;
 343                         *nextp = save;
 344                 }
 345         }
 346
 347         xo_open_container("user-table");
 348         xo_open_list("user-entry");
 349
 350         for (ep = ehead; ep != NULL; ep = ep->next) {
 351                 struct addrinfo hints, *res;
 352                 struct sockaddr_storage ss;
 353                 struct sockaddr *sa = (struct sockaddr *)&ss;
 354                 struct sockaddr_in *lsin = (struct sockaddr_in *)&ss;
 355                 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)&ss;
 356                 time_t t;
 357                 int isaddr;
 358
 359                 xo_open_instance("user-entry");
 360
 361                 save_p = p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
 362                 if ((x_suffix = strrchr(p, ':')) != NULL) {
 363                         if ((dot = strchr(x_suffix, '.')) != NULL &&
 364                             strchr(dot+1, '.') == NULL)
 365                                 *x_suffix++ = '\0';
 366                         else
 367                                 x_suffix = NULL;
 368                 }
 369
 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 (!nflag) {
 382                         /* Attempt to change an IP address into a name */
 383                         if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
 384                             sa->sa_len) == HOSTNAME_FOUND)
 385                                 p = fn;
 386                 } else if (!isaddr) {
 387                         /*
 388                          * If a host has only one A/AAAA RR, change a
 389                          * name into an IP address
 390                          */
 391                         memset(&hints, 0, sizeof(hints));
 392                         hints.ai_flags = AI_PASSIVE;
 393                         hints.ai_family = AF_UNSPEC;
 394                         hints.ai_socktype = SOCK_STREAM;
 395                         if (getaddrinfo(p, NULL, &hints, &res) == 0) {
 396                                 if (res->ai_next == NULL &&
 397                                     getnameinfo(res->ai_addr, res->ai_addrlen,
 398                                         fn, sizeof(fn), NULL, 0,
 399                                         NI_NUMERICHOST) == 0)
 400                                         p = fn;
 401                                 freeaddrinfo(res);
 402                         }
 403                 }
 404
 405                 if (x_suffix) {
 406                         (void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
 407                         p = buf;
 408                 }
 409                 if (dflag) {
 410                         xo_open_container("process-table");
 411                         xo_open_list("process-entry");
 412
 413                         for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
 414                                 const char *ptr;
 415
 416                                 ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
 417                                     dkp->ki_comm, NULL, MAXCOMLEN);
 418                                 if (ptr == NULL)
 419                                         ptr = "-";
 420                                 xo_open_instance("process-entry");
 421                                 xo_emit("\t\t{:process-id/%-9d/%d} {:command/%s}\n",
 422                                     dkp->ki_pid, ptr);
 423                                 xo_close_instance("process-entry");
 424                         }
 425                         xo_close_list("process-entry");
 426                         xo_close_container("process-table");
 427                 }
 428                 xo_emit("{:user/%-*.*s/%@**@s} {:tty/%-*.*s/%@**@s} ",
 429                         W_DISPUSERSIZE, W_DISPUSERSIZE, ep->utmp.ut_user,
 430                         W_DISPLINESIZE, W_DISPLINESIZE,
 431                         *ep->utmp.ut_line ?
 432                         (strncmp(ep->utmp.ut_line, "tty", 3) &&
 433                          strncmp(ep->utmp.ut_line, "cua", 3) ?
 434                          ep->utmp.ut_line : ep->utmp.ut_line + 3) : "-");
 435
 436                 if (save_p && save_p != p)
 437                     xo_attr("address", "%s", save_p);
 438                 xo_emit("{:from/%-*.*s/%@**@s} ",
 439                     W_DISPHOSTSIZE, W_DISPHOSTSIZE, *p ? p : "-");
 440                 t = ep->utmp.ut_tv.tv_sec;
 441                 longattime = pr_attime(&t, &now);
 442                 longidle = pr_idle(ep->idle);
 443                 xo_emit("{:command/%.*s/%@*@s}\n",
 444                     argwidth - longidle - longattime,
 445                     ep->args);
 446
 447                 xo_close_instance("user-entry");
 448         }
 449
 450         xo_close_list("user-entry");
 451         xo_close_container("user-table");
 452         xo_close_container("uptime-information");
 453         xo_finish();
 454
 455         (void)kvm_close(kd);
 456         exit(0);
 457 }
 458
 459 static void
 460 pr_header(time_t *nowp, int nusers)
 461 {
 462         double avenrun[3];
 463         time_t uptime;
 464         struct timespec tp;
 465         int days, hrs, i, mins, secs;
 466         char buf[256];
 467         struct sbuf *upbuf;
 468
 469         upbuf = sbuf_new_auto();
 470         /*
 471          * Print time of day.
 472          */
 473         if (strftime(buf, sizeof(buf),
 474             use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)) != 0)
 475                 xo_emit("{:time-of-day/%s} ", buf);
 476         /*
 477          * Print how long system has been up.
 478          */
 479         if (clock_gettime(CLOCK_UPTIME, &tp) != -1) {
 480                 uptime = tp.tv_sec;
 481                 if (uptime > 60)
 482                         uptime += 30;
 483                 days = uptime / 86400;
 484                 uptime %= 86400;
 485                 hrs = uptime / 3600;
 486                 uptime %= 3600;
 487                 mins = uptime / 60;
 488                 secs = uptime % 60;
 489                 xo_emit(" up");
 490                 xo_emit("{e:uptime/%lu}", (unsigned long) tp.tv_sec);
 491                 xo_emit("{e:days/%d}{e:hours/%d}{e:minutes/%d}{e:seconds/%d}", days, hrs, mins, secs);
 492
 493                 if (days > 0)
 494                         sbuf_printf(upbuf, " %d day%s,",
 495                                 days, days > 1 ? "s" : "");
 496                 if (hrs > 0 && mins > 0)
 497                         sbuf_printf(upbuf, " %2d:%02d,", hrs, mins);
 498                 else if (hrs > 0)
 499                         sbuf_printf(upbuf, " %d hr%s,",
 500                                 hrs, hrs > 1 ? "s" : "");
 501                 else if (mins > 0)
 502                         sbuf_printf(upbuf, " %d min%s,",
 503                                 mins, mins > 1 ? "s" : "");
 504                 else
 505                         sbuf_printf(upbuf, " %d sec%s,",
 506                                 secs, secs > 1 ? "s" : "");
 507                 if (sbuf_finish(upbuf) != 0)
 508                         xo_err(1, "Could not generate output");
 509                 xo_emit("{:uptime-human/%s}", sbuf_data(upbuf));
 510                 sbuf_delete(upbuf);
 511         }
 512
 513         /* Print number of users logged in to system */
 514         xo_emit(" {:users/%d} {Np:user,users}", nusers);
 515
 516         /*
 517          * Print 1, 5, and 15 minute load averages.
 518          */
 519         if (getloadavg(avenrun, nitems(avenrun)) == -1)
 520                 xo_emit(", no load average information available\n");
 521         else {
 522                 static const char *format[] = {
 523                     " {:load-average-1/%.2f}",
 524                     " {:load-average-5/%.2f}",
 525                     " {:load-average-15/%.2f}",
 526                 };
 527                 xo_emit(", load averages:");
 528                 for (i = 0; i < (int)(nitems(avenrun)); i++) {
 529                         if (use_comma && i > 0)
 530                                 xo_emit(",");
 531                         xo_emit(format[i], avenrun[i]);
 532                 }
 533                 xo_emit("\n");
 534         }
 535 }
 536
 537 static struct stat *
 538 ttystat(char *line)
 539 {
 540         static struct stat sb;
 541         char ttybuf[MAXPATHLEN];
 542
 543         (void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
 544         if (stat(ttybuf, &sb) == 0 && S_ISCHR(sb.st_mode)) {
 545                 return (&sb);
 546         } else
 547                 return (NULL);
 548 }
 549
 550 static void
 551 usage(int wcmd)
 552 {
 553         if (wcmd)
 554                 xo_error("usage: w [-dhin] [-M core] [-N system] [user ...]\n");
 555         else
 556                 xo_error("usage: uptime\n");
 557         xo_finish();
 558         exit(1);
 559 }