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  * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)w.c      8.4 (Berkeley) 4/16/94
  35  * $FreeBSD: src/usr.bin/w/w.c,v 1.38.2.6 2002/03/12 19:51:51 phantom Exp $
  36  * $DragonFly: src/usr.bin/w/w.c,v 1.10 2007/02/18 16:15:24 corecode Exp $
  37  */
  38
  39 /*
  40  * w - print system status (who and what)
  41  *
  42  * This program is similar to the systat command on Tenex/Tops 10/20
  43  *
  44  */
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <sys/stat.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/user.h>
  50 #include <sys/ioctl.h>
  51 #include <sys/socket.h>
  52 #include <sys/tty.h>
  53
  54 #include <machine/cpu.h>
  55 #include <netinet/in.h>
  56 #include <arpa/inet.h>
  57
  58 #include <ctype.h>
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <fcntl.h>
  62 #include <kvm.h>
  63 #include <limits.h>
  64 #include <langinfo.h>
  65 #include <locale.h>
  66 #include <netdb.h>
  67 #include <nlist.h>
  68 #include <paths.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <unistd.h>
  73 #include <utmp.h>
  74 #include <vis.h>
  75
  76 #include <arpa/nameser.h>
  77 #include <resolv.h>
  78
  79 #include "extern.h"
  80
  81 struct timeval  boottime;
  82 struct utmp     utmp;
  83 struct winsize  ws;
  84 kvm_t          *kd;
  85 time_t          now;            /* the current time of day */
  86 time_t          uptime;         /* time of last reboot & elapsed time since */
  87 int             ttywidth;       /* width of tty */
  88 int             argwidth;       /* width of tty */
  89 int             header = 1;     /* true if -h flag: don't print heading */
  90 int             nflag;          /* true if -n flag: don't convert addrs */
  91 int             dflag;          /* true if -d flag: output debug info */
  92 int             sortidle;       /* sort by idle time */
  93 int             use_ampm;       /* use AM/PM time */
  94 int             use_comma;      /* use comma as floats separator */
  95 char          **sel_users;      /* login array of particular users selected */
  96 char            domain[MAXHOSTNAMELEN];
  97
  98 /*
  99  * One of these per active utmp entry.
 100  */
 101 struct  entry {
 102         struct  entry *next;
 103         struct  utmp utmp;
 104         dev_t   tdev;                   /* dev_t of terminal */
 105         time_t  idle;                   /* idle time of terminal in seconds */
 106         struct  kinfo_proc *kp;         /* `most interesting' proc */
 107         char    *args;                  /* arg list of interesting process */
 108         struct  kinfo_proc *dkp;        /* debug option proc list */
 109 } *ep, *ehead = NULL, **nextp = &ehead;
 110
 111 #define debugproc(p) *((struct kinfo_proc **)&(p)->kp_spare[0])
 112
 113 static void              pr_header(time_t *, int);
 114 static struct stat      *ttystat(char *, int);
 115 static void              usage(int);
 116 static int               this_is_uptime(const char *s);
 117
 118 char *fmt_argv(char **, char *, int);   /* ../../bin/ps/fmt.c */
 119
 120 int
 121 main(int argc, char **argv)
 122 {
 123         struct kinfo_proc *kp;
 124         struct kinfo_proc *dkp;
 125         struct hostent *hp;
 126         struct stat *stp;
 127         FILE *ut;
 128         in_addr_t l;
 129         time_t touched;
 130         int ch, i, nentries, nusers, wcmd, longidle, dropgid;
 131         char *memf, *nlistf, *p, *x;
 132         char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
 133
 134         (void)setlocale(LC_ALL, "");
 135         use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
 136         use_comma = (*nl_langinfo(RADIXCHAR) != ',');
 137
 138         /* Are we w(1) or uptime(1)? */
 139         if (this_is_uptime(argv[0]) == 0) {
 140                 wcmd = 0;
 141                 p = "";
 142         } else {
 143                 wcmd = 1;
 144                 p = "dhiflM:N:nsuw";
 145         }
 146
 147         dropgid = 0;
 148         memf = nlistf = _PATH_DEVNULL;
 149         while ((ch = getopt(argc, argv, p)) != -1)
 150                 switch (ch) {
 151                 case 'd':
 152                         dflag = 1;
 153                         break;
 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                         dropgid = 1;
 164                         break;
 165                 case 'N':
 166                         nlistf = optarg;
 167                         dropgid = 1;
 168                         break;
 169                 case 'n':
 170                         nflag = 1;
 171                         break;
 172                 case 'f': case 'l': case 's': case 'u': case 'w':
 173                         warnx("[-flsuw] no longer supported");
 174                         /* FALLTHROUGH */
 175                 case '?':
 176                 default:
 177                         usage(wcmd);
 178                 }
 179         argc -= optind;
 180         argv += optind;
 181
 182         if (!(_res.options & RES_INIT))
 183                 res_init();
 184         _res.retrans = 2;       /* resolver timeout to 2 seconds per try */
 185         _res.retry = 1;         /* only try once.. */
 186
 187         /*
 188          * Discard setgid privileges if not the running kernel so that bad
 189          * guys can't print interesting stuff from kernel memory.
 190          */
 191         if (dropgid)
 192                 setgid(getgid());
 193
 194         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 195                 errx(1, "%s", errbuf);
 196
 197         (void)time(&now);
 198         if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
 199                 err(1, "%s", _PATH_UTMP);
 200
 201         if (*argv)
 202                 sel_users = argv;
 203
 204         for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
 205                 if (utmp.ut_name[0] == '\0')
 206                         continue;
 207                 if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
 208                         continue;       /* corrupted record */
 209                 ++nusers;
 210                 if (wcmd == 0)
 211                         continue;
 212                 if (sel_users) {
 213                         int usermatch;
 214                         char **user;
 215
 216                         usermatch = 0;
 217                         for (user = sel_users; !usermatch && *user; user++)
 218                                 if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
 219                                         usermatch = 1;
 220                         if (!usermatch)
 221                                 continue;
 222                 }
 223                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 224                         errx(1, "calloc");
 225                 *nextp = ep;
 226                 nextp = &ep->next;
 227                 memmove(&ep->utmp, &utmp, sizeof(struct utmp));
 228                 ep->tdev = stp->st_rdev;
 229 #ifdef CPU_CONSDEV
 230                 /*
 231                  * If this is the console device, attempt to ascertain
 232                  * the true console device dev_t.
 233                  */
 234                 if (ep->tdev == 0) {
 235                         int mib[2];
 236                         size_t size;
 237
 238                         mib[0] = CTL_MACHDEP;
 239                         mib[1] = CPU_CONSDEV;
 240                         size = sizeof(dev_t);
 241                         (void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
 242                 }
 243 #endif
 244                 touched = stp->st_atime;
 245                 if (touched < ep->utmp.ut_time) {
 246                         /* tty untouched since before login */
 247                         touched = ep->utmp.ut_time;
 248                 }
 249                 if ((ep->idle = now - touched) < 0)
 250                         ep->idle = 0;
 251         }
 252         (void)fclose(ut);
 253
 254         if (header || wcmd == 0) {
 255                 pr_header(&now, nusers);
 256                 if (wcmd == 0) {
 257                         (void)kvm_close(kd);
 258                         exit(0);
 259                 }
 260
 261 #define HEADER_USER             "USER"
 262 #define HEADER_TTY              "TTY"
 263 #define HEADER_FROM             "FROM"
 264 #define HEADER_LOGIN_IDLE       "LOGIN@  IDLE "
 265 #define HEADER_WHAT             "WHAT\n"
 266 #define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
 267                 sizeof(HEADER_LOGIN_IDLE) + 3)  /* header width incl. spaces */
 268                 (void)printf("%-*.*s %-*.*s %-*.*s  %s",
 269                                 UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
 270                                 UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
 271                                 UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
 272                                 HEADER_LOGIN_IDLE HEADER_WHAT);
 273         }
 274
 275         if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
 276                 err(1, "%s", kvm_geterr(kd));
 277         for (i = 0; i < nentries; i++, kp++) {
 278                 if (kp->kp_stat == SIDL || kp->kp_stat == SZOMB)
 279                         continue;
 280                 for (ep = ehead; ep != NULL; ep = ep->next) {
 281                         if (ep->tdev == kp->kp_tdev) {
 282                                 /*
 283                                  * proc is associated with this terminal
 284                                  */
 285                                 if (ep->kp == NULL && kp->kp_pgid == kp->kp_tpgid) {
 286                                         /*
 287                                          * Proc is 'most interesting'
 288                                          */
 289                                         if (proc_compare(ep->kp, kp))
 290                                                 ep->kp = kp;
 291                                 }
 292                                 /*
 293                                  * Proc debug option info; add to debug
 294                                  * list using kinfo_proc kp_eproc.e_spare
 295                                  * as next pointer; ptr to ptr avoids the
 296                                  * ptr = long assumption.
 297                                  */
 298                                 dkp = ep->dkp;
 299                                 ep->dkp = kp;
 300                                 debugproc(kp) = dkp;
 301                         }
 302                 }
 303         }
 304         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
 305              ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
 306              ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
 307                ttywidth = 79;
 308         else
 309                ttywidth = ws.ws_col - 1;
 310         argwidth = ttywidth - WUSED;
 311         if (argwidth < 4)
 312                 argwidth = 8;
 313         for (ep = ehead; ep != NULL; ep = ep->next) {
 314                 if (ep->kp == NULL) {
 315                         ep->args = "-";
 316                         continue;
 317                 }
 318                 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
 319                     ep->kp->kp_comm, MAXCOMLEN);
 320                 if (ep->args == NULL)
 321                         err(1, NULL);
 322         }
 323         /* sort by idle time */
 324         if (sortidle && ehead != NULL) {
 325                 struct entry *from, *save;
 326
 327                 from = ehead;
 328                 ehead = NULL;
 329                 while (from != NULL) {
 330                         for (nextp = &ehead;
 331                             (*nextp) && from->idle >= (*nextp)->idle;
 332                             nextp = &(*nextp)->next)
 333                                 continue;
 334                         save = from;
 335                         from = from->next;
 336                         save->next = *nextp;
 337                         *nextp = save;
 338                 }
 339         }
 340
 341         if (!nflag) {
 342                 if (gethostname(domain, sizeof(domain)) < 0 ||
 343                     (p = strchr(domain, '.')) == NULL)
 344                         domain[0] = '\0';
 345                 else {
 346                         domain[sizeof(domain) - 1] = '\0';
 347                         memmove(domain, p, strlen(p) + 1);
 348                 }
 349         }
 350
 351         for (ep = ehead; ep != NULL; ep = ep->next) {
 352                 char host_buf[UT_HOSTSIZE + 1];
 353
 354                 host_buf[UT_HOSTSIZE] = '\0';
 355                 strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
 356                 p = *host_buf ? host_buf : "-";
 357                 if ((x = strchr(p, ':')) != NULL)
 358                         *x++ = '\0';
 359                 if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
 360                     (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
 361                         if (domain[0] != '\0') {
 362                                 p = hp->h_name;
 363                                 p += strlen(hp->h_name);
 364                                 p -= strlen(domain);
 365                                 if (p > hp->h_name &&
 366                                     strcasecmp(p, domain) == 0)
 367                                         *p = '\0';
 368                         }
 369                         p = hp->h_name;
 370                 }
 371                 if (nflag && *p && strcmp(p, "-") &&
 372                     inet_addr(p) == INADDR_NONE) {
 373                         hp = gethostbyname(p);
 374
 375                         if (hp != NULL) {
 376                                 struct in_addr in;
 377
 378                                 memmove(&in, hp->h_addr, sizeof(in));
 379                                 p = inet_ntoa(in);
 380                         }
 381                 }
 382                 if (x) {
 383                         (void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
 384                         p = buf;
 385                 }
 386                 if (dflag) {
 387                         for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
 388                                 char *ptr;
 389
 390                                 ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
 391                                     dkp->kp_comm, MAXCOMLEN);
 392                                 if (ptr == NULL)
 393                                         ptr = "-";
 394                                 (void)printf("\t\t%-9d %s\n",
 395                                     dkp->kp_pid, ptr);
 396                         }
 397                 }
 398                 (void)printf("%-*.*s %-*.*s %-*.*s ",
 399                     UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
 400                     UT_LINESIZE, UT_LINESIZE,
 401                     strncmp(ep->utmp.ut_line, "tty", 3) &&
 402                     strncmp(ep->utmp.ut_line, "cua", 3) ?
 403                     ep->utmp.ut_line : ep->utmp.ut_line + 3,
 404                     UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
 405                 pr_attime(&ep->utmp.ut_time, &now);
 406                 longidle = pr_idle(ep->idle);
 407                 (void)printf("%.*s\n", argwidth - longidle, ep->args);
 408         }
 409         (void)kvm_close(kd);
 410         exit(0);
 411 }
 412
 413 static void
 414 pr_header(time_t *nowp, int nusers)
 415 {
 416         double avenrun[3];
 417         time_t uptime;
 418         int days, hrs, i, mins, secs;
 419         int mib[2];
 420         size_t size;
 421         char buf[256];
 422
 423         /*
 424          * Print time of day.
 425          */
 426         (void)strftime(buf, sizeof(buf) - 1,
 427                        use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp));
 428         buf[sizeof(buf) - 1] = '\0';
 429         (void)printf("%s ", buf);
 430
 431         /*
 432          * Print how long system has been up.
 433          * (Found by looking at "boottime" from the kernel)
 434          */
 435         mib[0] = CTL_KERN;
 436         mib[1] = KERN_BOOTTIME;
 437         size = sizeof(boottime);
 438         if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
 439             boottime.tv_sec != 0) {
 440                 uptime = now - boottime.tv_sec;
 441                 if (uptime > 60)
 442                         uptime += 30;
 443                 days = uptime / 86400;
 444                 uptime %= 86400;
 445                 hrs = uptime / 3600;
 446                 uptime %= 3600;
 447                 mins = uptime / 60;
 448                 secs = uptime % 60;
 449                 (void)printf(" up");
 450                 if (days > 0)
 451                         (void)printf(" %d day%s,", days, days > 1 ? "s" : "");
 452                 if (hrs > 0 && mins > 0)
 453                         (void)printf(" %2d:%02d,", hrs, mins);
 454                 else if (hrs > 0)
 455                         (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
 456                 else if (mins > 0)
 457                         (void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
 458                 else
 459                         (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
 460         }
 461
 462         /* Print number of users logged in on system */
 463         (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
 464
 465         /*
 466          * Print 1, 5, and 15 minute load averages.
 467          */
 468         if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
 469                 (void)printf(", no load average information available\n");
 470         else {
 471                 (void)printf(", load averages:");
 472                 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
 473                         if (use_comma && i > 0)
 474                                 (void)printf(",");
 475                         (void)printf(" %.2f", avenrun[i]);
 476                 }
 477                 (void)printf("\n");
 478         }
 479 }
 480
 481 static struct stat *
 482 ttystat(char *line, int sz)
 483 {
 484         static struct stat sb;
 485         char ttybuf[MAXPATHLEN];
 486
 487         (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
 488         if (stat(ttybuf, &sb)) {
 489                 warn("%s", ttybuf);
 490                 return (NULL);
 491         }
 492         return (&sb);
 493 }
 494
 495 static void
 496 usage(int wcmd)
 497 {
 498         if (wcmd)
 499                 (void)fprintf(stderr,
 500                     "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
 501         else
 502                 (void)fprintf(stderr, "usage: uptime\n");
 503         exit(1);
 504 }
 505
 506 static int
 507 this_is_uptime(const char *s)
 508 {
 509         const char *u;
 510
 511         if ((u = strrchr(s, '/')) != NULL)
 512                 ++u;
 513         else
 514                 u = s;
 515         if (strcmp(u, "uptime") == 0)
 516                 return (0);
 517         return (-1);
 518 }