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. 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  * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)w.c      8.4 (Berkeley) 4/16/94
  31  * $FreeBSD: src/usr.bin/w/w.c,v 1.38.2.6 2002/03/12 19:51:51 phantom Exp $
  32  */
  33
  34 /*
  35  * w - print system status (who and what)
  36  *
  37  * This program is similar to the systat command on Tenex/Tops 10/20
  38  *
  39  */
  40 #include <sys/user.h>
  41 #include <sys/param.h>
  42 #include <sys/time.h>
  43 #include <sys/stat.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/ioctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/tty.h>
  48
  49 #include <machine/cpu.h>
  50 #include <netinet/in.h>
  51 #include <arpa/inet.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #include <kvm.h>
  58 #include <limits.h>
  59 #include <langinfo.h>
  60 #include <locale.h>
  61 #include <netdb.h>
  62 #include <nlist.h>
  63 #include <paths.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68 #include <utmpx.h>
  69 #include <vis.h>
  70
  71 #include <arpa/nameser.h>
  72 #include <resolv.h>
  73
  74 #include "extern.h"
  75
  76 static struct winsize   ws;
  77 static kvm_t    *kd;
  78 static time_t   now;            /* the current time of day */
  79 static time_t   then;
  80 static int      ttywidth;       /* width of tty */
  81 static int      argwidth;       /* width of tty */
  82 static int      header = 1;     /* true if -h flag: don't print heading */
  83 static int      nflag;          /* true if -n flag: don't convert addrs */
  84 static int      dflag;          /* true if -d flag: output debug info */
  85 static int      sortidle;       /* sort by idle time */
  86 int             use_ampm;       /* use AM/PM time */
  87 static int      use_comma;      /* use comma as floats separator */
  88 static char     **sel_users;    /* login array of particular users selected */
  89 static char     domain[MAXHOSTNAMELEN];
  90 static int      maxname = 8, maxline = 3, maxhost = 16;
  91
  92 struct kplist {
  93         struct kplist *next;
  94         struct kinfo_proc *kp;
  95 };
  96
  97 /*
  98  * One of these per active utmpx entry.
  99  */
 100 static struct entry {
 101         struct  entry *next;
 102         char    name[UTX_USERSIZE + 1];
 103         char    line[UTX_LINESIZE + 1];
 104         char    host[UTX_HOSTSIZE + 1];
 105         char    type[2];
 106         struct timeval tv;
 107         dev_t   tdev;                   /* dev_t of terminal */
 108         time_t  idle;                   /* idle time of terminal in seconds */
 109         struct  kinfo_proc *kp;         /* `most interesting' proc */
 110         char    *args;                  /* arg list of interesting process */
 111         struct  kplist *list;           /* debug option proc list */
 112         pid_t   pid;                    /* pid or ~0 if not known */
 113 } *ep, *ehead = NULL, **nextp = &ehead;
 114
 115 static void              pr_header(time_t *, int);
 116 static struct stat      *ttystat(char *, int);
 117 static void              process(struct entry *);
 118 static void              usage(int);
 119 static int               this_is_uptime(const char *s);
 120
 121 char *fmt_argv(char **, char *, int);   /* ../../bin/ps/fmt.c */
 122
 123 int
 124 main(int argc, char **argv)
 125 {
 126         struct kinfo_proc *kp;
 127         struct kplist *scan;
 128         struct hostent *hp;
 129         in_addr_t l;
 130         int ch, i, nentries, nusers, wcmd, longidle, dropgid;
 131         char *memf, *nlistf, *p, *x;
 132         struct utmpx *utx;
 133         char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
 134
 135         (void)setlocale(LC_ALL, "");
 136         use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
 137         use_comma = (*nl_langinfo(RADIXCHAR) != ',');
 138
 139         /* Are we w(1) or uptime(1)? */
 140         if (this_is_uptime(argv[0]) == 0) {
 141                 wcmd = 0;
 142                 p = "";
 143         } else {
 144                 wcmd = 1;
 145                 p = "dhiflM:N:nsuw";
 146         }
 147
 148         dropgid = 0;
 149         memf = nlistf = _PATH_DEVNULL;
 150         while ((ch = getopt(argc, argv, p)) != -1)
 151                 switch (ch) {
 152                 case 'd':
 153                         dflag = 1;
 154                         break;
 155                 case 'h':
 156                         header = 0;
 157                         break;
 158                 case 'i':
 159                         sortidle = 1;
 160                         break;
 161                 case 'M':
 162                         header = 0;
 163                         memf = optarg;
 164                         dropgid = 1;
 165                         break;
 166                 case 'N':
 167                         nlistf = optarg;
 168                         dropgid = 1;
 169                         break;
 170                 case 'n':
 171                         nflag = 1;
 172                         break;
 173                 case 'f': case 'l': case 's': case 'u': case 'w':
 174                         warnx("[-flsuw] no longer supported");
 175                         /* FALLTHROUGH */
 176                 case '?':
 177                 default:
 178                         usage(wcmd);
 179                 }
 180         argc -= optind;
 181         argv += optind;
 182
 183         if (!(_res.options & RES_INIT))
 184                 res_init();
 185         _res.retrans = 2;       /* resolver timeout to 2 seconds per try */
 186         _res.retry = 1;         /* only try once.. */
 187
 188         /*
 189          * Discard setgid privileges if not the running kernel so that bad
 190          * guys can't print interesting stuff from kernel memory.
 191          */
 192         if (dropgid)
 193                 setgid(getgid());
 194
 195         if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
 196                 errx(1, "%s", errbuf);
 197
 198         (void)time(&now);
 199         setutxent();
 200
 201         if (*argv)
 202                 sel_users = argv;
 203
 204         nusers = 0;
 205         while ((utx = getutxent()) != NULL) {
 206                 if (utx->ut_type != USER_PROCESS)
 207                         continue;
 208                 ++nusers;
 209
 210                 if (sel_users) {
 211                         int usermatch;
 212                         char **user;
 213
 214                         usermatch = 0;
 215                         for (user = sel_users; !usermatch && *user; user++)
 216                                 if (!strncmp(utx->ut_name, *user, UTX_USERSIZE))
 217                                         usermatch = 1;
 218                         if (!usermatch)
 219                                 continue;
 220                 }
 221
 222                 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
 223                         err(1, NULL);
 224                 (void)memcpy(ep->name, utx->ut_name, sizeof(utx->ut_name));
 225                 (void)memcpy(ep->line, utx->ut_line, sizeof(utx->ut_line));
 226                 (void)memcpy(ep->host, utx->ut_host, sizeof(utx->ut_host));
 227                 ep->name[sizeof(utx->ut_name)] = '\0';
 228                 ep->line[sizeof(utx->ut_line)] = '\0';
 229                 ep->host[sizeof(utx->ut_host)] = '\0';
 230 #if 1
 231                 /* XXX: Actually we don't support the utx->ut_ss stuff yet */
 232                 if (!nflag || getnameinfo((struct sockaddr *)&utx->ut_ss,
 233                     utx->ut_ss.ss_len, ep->host, sizeof(ep->host), NULL, 0,
 234                     NI_NUMERICHOST) != 0) {
 235                         (void)memcpy(ep->host, utx->ut_host,
 236                             sizeof(utx->ut_host));
 237                         ep->host[sizeof(utx->ut_host)] = '\0';
 238                 }
 239 #endif
 240                 ep->type[0] = 'x';
 241                 ep->tv = utx->ut_tv;
 242                 ep->pid = utx->ut_pid;
 243
 244                 *nextp = ep;
 245                 nextp = &(ep->next);
 246                 if (wcmd != 0)
 247                         process(ep);
 248         }
 249         endutxent();
 250
 251         if (header || wcmd == 0) {
 252                 pr_header(&now, nusers);
 253                 if (wcmd == 0) {
 254                         (void)kvm_close(kd);
 255                         exit(0);
 256                 }
 257
 258 #define HEADER_USER             "USER"
 259 #define HEADER_TTY              "TTY"
 260 #define HEADER_FROM             "FROM"
 261 #define HEADER_LOGIN_IDLE       "LOGIN@  IDLE "
 262 #define HEADER_WHAT             "WHAT\n"
 263 #define WUSED  (maxname + maxline + maxhost + \
 264                 sizeof(HEADER_LOGIN_IDLE) + 3)  /* header width incl. spaces */
 265                 (void)printf("%-*.*s %-*.*s %-*.*s  %s",
 266                                 maxname, maxname, HEADER_USER,
 267                                 maxline, maxline, HEADER_TTY,
 268                                 maxhost, maxhost, HEADER_FROM,
 269                                 HEADER_LOGIN_IDLE HEADER_WHAT);
 270         }
 271
 272         if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
 273                 err(1, "%s", kvm_geterr(kd));
 274         for (i = 0; i < nentries; i++, kp++) {
 275                 /*
 276                  * login(1) is a special case.
 277                  */
 278                 if (strcmp(kp->kp_comm, "login") == 0)
 279                         continue;
 280                 if (kp->kp_stat == SIDL || kp->kp_stat == SZOMB)
 281                         continue;
 282                 if (kp->kp_sid != kp->kp_tsid)
 283                         continue;
 284                 for (ep = ehead; ep != NULL; ep = ep->next) {
 285                         if (ep->tdev == kp->kp_tdev) {
 286                                 /*
 287                                  * proc is associated with this terminal
 288                                  */
 289                                 if (ep->kp == NULL &&
 290                                     kp->kp_pgid == kp->kp_tpgid)
 291                                 {
 292                                         /*
 293                                          * Proc is 'most interesting'
 294                                          */
 295                                         if (proc_compare(ep->kp, kp))
 296                                                 ep->kp = kp;
 297                                 }
 298                                 /*
 299                                  * Retain list of kinfo_proc's for -d
 300                                  * option.
 301                                  */
 302                                 scan = malloc(sizeof(*scan));
 303                                 scan->kp = kp;
 304                                 scan->next = ep->list;
 305                                 ep->list = scan;
 306                         }
 307                         if (ep->pid != 0 && ep->pid == kp->kp_pid) {
 308                                 ep->kp = kp;
 309                                 break;
 310                         }
 311                 }
 312         }
 313         if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
 314              ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
 315              ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
 316                ttywidth = 79;
 317         else
 318                ttywidth = ws.ws_col - 1;
 319         argwidth = ttywidth - WUSED;
 320         if (argwidth < 4)
 321                 argwidth = 8;
 322         for (ep = ehead; ep != NULL; ep = ep->next) {
 323                 if (ep->kp == NULL) {
 324                         ep->args = "-";
 325                         continue;
 326                 }
 327                 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
 328                     ep->kp->kp_comm, MAXCOMLEN);
 329                 if (ep->args == NULL)
 330                         err(1, NULL);
 331         }
 332         /* sort by idle time */
 333         if (sortidle && ehead != NULL) {
 334                 struct entry *from, *save;
 335
 336                 from = ehead;
 337                 ehead = NULL;
 338                 while (from != NULL) {
 339                         for (nextp = &ehead;
 340                             (*nextp) && from->idle >= (*nextp)->idle;
 341                             nextp = &(*nextp)->next)
 342                                 continue;
 343                         save = from;
 344                         from = from->next;
 345                         save->next = *nextp;
 346                         *nextp = save;
 347                 }
 348         } else if (ehead != NULL) {
 349                 struct entry *from = ehead, *save;
 350
 351                 ehead = NULL;
 352                 while (from != NULL) {
 353                         for (nextp = &ehead;
 354                             (*nextp) && strcmp(from->line, (*nextp)->line) > 0;
 355                             nextp = &(*nextp)->next)
 356                                 continue;
 357                         save = from;
 358                         from = from->next;
 359                         save->next = *nextp;
 360                         *nextp = save;
 361                 }
 362         }
 363
 364         if (!nflag) {
 365                 if (gethostname(domain, sizeof(domain)) < 0 ||
 366                     (p = strchr(domain, '.')) == NULL)
 367                         domain[0] = '\0';
 368                 else {
 369                         domain[sizeof(domain) - 1] = '\0';
 370                         memmove(domain, p, strlen(p) + 1);
 371                 }
 372         }
 373
 374         for (ep = ehead; ep != NULL; ep = ep->next) {
 375                 char host_buf[UTX_HOSTSIZE + 1];
 376
 377                 host_buf[UTX_HOSTSIZE] = '\0';
 378                 strncpy(host_buf, ep->host, maxhost);
 379                 p = *host_buf ? host_buf : "-";
 380                 if ((x = strchr(p, ':')) != NULL)
 381                         *x++ = '\0';
 382                 if (!nflag && isdigit(*p) &&
 383                     (l = inet_addr(p)) != INADDR_NONE &&
 384                     (hp = gethostbyaddr(&l, sizeof(l), AF_INET))) {
 385                         if (domain[0] != '\0') {
 386                                 p = hp->h_name;
 387                                 p += strlen(hp->h_name);
 388                                 p -= strlen(domain);
 389                                 if (p > hp->h_name &&
 390                                     strcasecmp(p, domain) == 0)
 391                                         *p = '\0';
 392                         }
 393                         p = hp->h_name;
 394                 }
 395                 if (nflag && *p && strcmp(p, "-") &&
 396                     inet_addr(p) == INADDR_NONE) {
 397                         hp = gethostbyname(p);
 398
 399                         if (hp != NULL) {
 400                                 struct in_addr in;
 401
 402                                 memmove(&in, hp->h_addr, sizeof(in));
 403                                 p = inet_ntoa(in);
 404                         }
 405                 }
 406                 if (x) {
 407                         (void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
 408                         p = buf;
 409                 }
 410                 if (dflag) {
 411                         for (scan = ep->list; scan; scan = scan->next) {
 412                                 char *ptr;
 413
 414                                 ptr = fmt_argv(kvm_getargv(kd, scan->kp,
 415                                                            argwidth),
 416                                                scan->kp->kp_comm,
 417                                                MAXCOMLEN);
 418                                 if (ptr == NULL)
 419                                         ptr = "-";
 420                                 printf("\t\t%-9d %s\n", scan->kp->kp_pid, ptr);
 421                         }
 422                 }
 423                 (void)printf("%-*.*s %-*.*s %-*.*s ",
 424                     maxname, maxname, ep->name,
 425                     maxline, maxline,
 426                     strncmp(ep->line, "tty", 3) &&
 427                     strncmp(ep->line, "cua", 3) ?
 428                     ep->line : ep->line + 3,
 429                     maxhost, maxhost, *p ? p : "-");
 430                 then = (time_t)ep->tv.tv_sec;
 431                 pr_attime(&then, &now);
 432                 longidle = pr_idle(ep->idle);
 433                 (void)printf("%.*s\n", argwidth - longidle, ep->args);
 434         }
 435         (void)kvm_close(kd);
 436         exit(0);
 437 }
 438
 439 static void
 440 pr_header(time_t *nowp, int nusers)
 441 {
 442         struct timespec boot_ts;
 443         double avenrun[3];
 444         time_t uptime;
 445         int days, hrs, i, mins, secs;
 446         char buf[256];
 447
 448         /*
 449          * Print time of day. (use "AM"/"PM" for all locales)
 450          */
 451         (void)strftime_l(buf, sizeof(buf) - 1,
 452                        use_ampm ? "%l:%M%p" : "%k:%M",
 453                        localtime(nowp), NULL);
 454         buf[sizeof(buf) - 1] = '\0';
 455         (void)printf("%s ", buf);
 456
 457         /*
 458          * Print how long system has been up.
 459          *
 460          * Use clock_gettime() rather than trying to calculate
 461          * a realtime delta that would be subject to time and date
 462          * changes.
 463          */
 464         if (clock_gettime(CLOCK_UPTIME, &boot_ts) == 0) {
 465                 uptime = boot_ts.tv_sec;
 466                 if (uptime > 60)
 467                         uptime += 30;
 468                 days = uptime / 86400;
 469                 uptime %= 86400;
 470                 hrs = uptime / 3600;
 471                 uptime %= 3600;
 472                 mins = uptime / 60;
 473                 secs = uptime % 60;
 474                 (void)printf(" up");
 475                 if (days > 0)
 476                         (void)printf(" %d day%s,", days, days > 1 ? "s" : "");
 477                 if (hrs > 0 && mins > 0)
 478                         (void)printf(" %2d:%02d,", hrs, mins);
 479                 else if (hrs > 0)
 480                         (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
 481                 else if (mins > 0)
 482                         (void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
 483                 else
 484                         (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
 485         }
 486
 487         /* Print number of users logged in on system */
 488         (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
 489
 490         /*
 491          * Print 1, 5, and 15 minute load averages.
 492          */
 493         if (getloadavg(avenrun, NELEM(avenrun)) == -1)
 494                 (void)printf(", no load average information available\n");
 495         else {
 496                 (void)printf(", load averages:");
 497                 for (i = 0; i < (int)NELEM(avenrun); i++) {
 498                         if (use_comma && i > 0)
 499                                 (void)printf(",");
 500                         (void)printf(" %.2f", avenrun[i]);
 501                 }
 502                 (void)printf("\n");
 503         }
 504 }
 505
 506 static struct stat *
 507 ttystat(char *line, int sz)
 508 {
 509         static struct stat sb;
 510         char ttybuf[MAXPATHLEN];
 511
 512         (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
 513         if (stat(ttybuf, &sb)) {
 514                 warn("%s", ttybuf);
 515                 return (NULL);
 516         }
 517         return (&sb);
 518 }
 519
 520 static void
 521 usage(int wcmd)
 522 {
 523         if (wcmd)
 524                 (void)fprintf(stderr,
 525                     "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
 526         else
 527                 (void)fprintf(stderr, "usage: uptime\n");
 528         exit(1);
 529 }
 530
 531 static int
 532 this_is_uptime(const char *s)
 533 {
 534         const char *u;
 535
 536         if ((u = strrchr(s, '/')) != NULL)
 537                 ++u;
 538         else
 539                 u = s;
 540         if (strcmp(u, "uptime") == 0)
 541                 return (0);
 542         return (-1);
 543 }
 544
 545 static void
 546 process(struct entry *ep)
 547 {
 548         struct stat *stp;
 549         time_t touched;
 550         int max;
 551
 552         if ((max = strlen(ep->name)) > maxname)
 553                 maxname = max;
 554         if ((max = strlen(ep->line)) > maxline)
 555                 maxline = max;
 556         if ((max = strlen(ep->host)) > maxhost)
 557                 maxhost = max;
 558
 559         ep->tdev = 0;
 560         ep->idle = (time_t)-1;
 561
 562         if (!(stp = ttystat(ep->line, maxline)))
 563                 return; /* corrupted record */
 564
 565         ep->tdev = stp->st_rdev;
 566 #ifdef CPU_CONSDEV
 567         /*
 568          * If this is the console device, attempt to ascertain
 569          * the true console device dev_t.
 570          */
 571         if (ep->tdev == 0) {
 572                 int mib[2];
 573                 size_t size;
 574
 575                 mib[0] = CTL_MACHDEP;
 576                 mib[1] = CPU_CONSDEV;
 577                 size = sizeof(dev_t);
 578                 (void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
 579         }
 580 #endif
 581
 582         touched = stp->st_atime;
 583         if (touched < ep->tv.tv_sec) {
 584                 /* tty untouched since before login */
 585                 touched = ep->tv.tv_sec;
 586         }
 587         if ((ep->idle = now - touched) < 0)
 588                 ep->idle = 0;
 589 }