usr.sbin/ac/ac.c

   1 /*
   2  *      Copyright (c) 1994 Christopher G. Demetriou.
   3  *      @(#)Copyright (c) 1994, Simon J. Gerraty.
   4  *
   5  *      This is free software.  It comes with NO WARRANTY.
   6  *      Permission to use, modify and distribute this source code
   7  *      is granted subject to the following conditions.
   8  *      1/ that the above copyright notice and this notice
   9  *      are preserved in all copies and that due credit be given
  10  *      to the author.
  11  *      2/ that any changes to this code are clearly commented
  12  *      as such so that the author does not get blamed for bugs
  13  *      other than his own.
  14  *
  15  * $FreeBSD: src/usr.sbin/ac/ac.c,v 1.14.2.2 2002/03/12 19:55:04 phantom Exp $
  16  */
  17
  18 #include <sys/types.h>
  19 #include <sys/file.h>
  20 #include <sys/time.h>
  21 #include <err.h>
  22 #include <errno.h>
  23 #include <langinfo.h>
  24 #include <locale.h>
  25 #include <pwd.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <utmp.h>
  31
  32 /*
  33  * this is for our list of currently logged in sessions
  34  */
  35 struct utmp_list {
  36         struct utmp_list *next;
  37         struct utmp usr;
  38 };
  39
  40 /*
  41  * this is for our list of users that are accumulating time.
  42  */
  43 struct user_list {
  44         struct user_list *next;
  45         char    name[UT_NAMESIZE+1];
  46         time_t  secs;
  47 };
  48
  49 /*
  50  * this is for chosing whether to ignore a login
  51  */
  52 struct tty_list {
  53         struct tty_list *next;
  54         char    name[UT_LINESIZE+3];
  55         int     len;
  56         int     ret;
  57 };
  58
  59 /*
  60  * globals - yes yuk
  61  */
  62 #ifdef CONSOLE_TTY
  63 static char     *Console = CONSOLE_TTY;
  64 #endif
  65 static time_t   Total = 0;
  66 static time_t   FirstTime = 0;
  67 static int      Flags = 0;
  68 static struct user_list *Users = NULL;
  69 static struct tty_list *Ttys = NULL;
  70
  71 #define NEW(type) (type *)malloc(sizeof(type))
  72
  73 #define AC_W    1                               /* not _PATH_WTMP */
  74 #define AC_D    2                               /* daily totals (ignore -p) */
  75 #define AC_P    4                               /* per-user totals */
  76 #define AC_U    8                               /* specified users only */
  77 #define AC_T    16                              /* specified ttys only */
  78
  79 #ifdef DEBUG
  80 static int Debug = 0;
  81 #endif
  82
  83 static int              ac(FILE *);
  84 static struct tty_list  *add_tty(char *);
  85 static int              do_tty(char *);
  86 static FILE             *file(const char *);
  87 static struct utmp_list *log_in(struct utmp_list *, struct utmp *);
  88 static struct utmp_list *log_out(struct utmp_list *, struct utmp *);
  89 #ifdef CONSOLE_TTY
  90 static int              on_console(struct utmp_list *);
  91 #endif
  92 static void             show(const char *, time_t);
  93 static void             show_today(struct user_list *, struct utmp_list *,
  94                             time_t);
  95 static void             show_users(struct user_list *);
  96 static struct user_list *update_user(struct user_list *, char *, time_t);
  97 static void             usage(void) __dead2;
  98
  99 /*
 100  * open wtmp or die
 101  */
 102 static FILE *
 103 file(const char *name)
 104 {
 105         FILE *fp;
 106
 107         if ((fp = fopen(name, "r")) == NULL)
 108                 err(1, "%s", name);
 109         /* in case we want to discriminate */
 110         if (strcmp(_PATH_WTMP, name))
 111                 Flags |= AC_W;
 112         return fp;
 113 }
 114
 115 static struct tty_list *
 116 add_tty(char *name)
 117 {
 118         struct tty_list *tp;
 119         char *rcp;
 120
 121         Flags |= AC_T;
 122
 123         if ((tp = NEW(struct tty_list)) == NULL)
 124                 errx(1, "malloc failed");
 125         tp->len = 0;                            /* full match */
 126         tp->ret = 1;                            /* do if match */
 127         if (*name == '!') {                     /* don't do if match */
 128                 tp->ret = 0;
 129                 name++;
 130         }
 131         strncpy(tp->name, name, sizeof(tp->name) - 1);
 132         tp->name[sizeof(tp->name) - 1] = '\0';
 133         if ((rcp = strchr(tp->name, '*')) != NULL) {    /* wild card */
 134                 *rcp = '\0';
 135                 tp->len = strlen(tp->name);     /* match len bytes only */
 136         }
 137         tp->next = Ttys;
 138         Ttys = tp;
 139         return Ttys;
 140 }
 141
 142 /*
 143  * should we process the named tty?
 144  */
 145 static int
 146 do_tty(char *name)
 147 {
 148         struct tty_list *tp;
 149         int def_ret = 0;
 150
 151         for (tp = Ttys; tp != NULL; tp = tp->next) {
 152                 if (tp->ret == 0)               /* specific don't */
 153                         def_ret = 1;            /* default do */
 154                 if (tp->len != 0) {
 155                         if (strncmp(name, tp->name, tp->len) == 0)
 156                                 return tp->ret;
 157                 } else {
 158                         if (strncmp(name, tp->name, sizeof(tp->name)) == 0)
 159                                 return tp->ret;
 160                 }
 161         }
 162         return def_ret;
 163 }
 164
 165 #ifdef CONSOLE_TTY
 166 /*
 167  * is someone logged in on Console?
 168  */
 169 static int
 170 on_console(struct utmp_list *head)
 171 {
 172         struct utmp_list *up;
 173
 174         for (up = head; up; up = up->next) {
 175                 if (strncmp(up->usr.ut_line, Console,
 176                     sizeof(up->usr.ut_line)) == 0)
 177                         return 1;
 178         }
 179         return 0;
 180 }
 181 #endif
 182
 183 /*
 184  * update user's login time
 185  */
 186 static struct user_list *
 187 update_user(struct user_list *head, char *name, time_t secs)
 188 {
 189         struct user_list *up;
 190
 191         for (up = head; up != NULL; up = up->next) {
 192                 if (strncmp(up->name, name, UT_NAMESIZE) == 0) {
 193                         up->secs += secs;
 194                         Total += secs;
 195                         return head;
 196                 }
 197         }
 198         /*
 199          * not found so add new user unless specified users only
 200          */
 201         if (Flags & AC_U)
 202                 return head;
 203
 204         if ((up = NEW(struct user_list)) == NULL)
 205                 errx(1, "malloc failed");
 206         up->next = head;
 207         strncpy(up->name, name, sizeof(up->name) - 1);
 208         up->name[sizeof(up->name) - 1] = '\0';  /* paranoid! */
 209         up->secs = secs;
 210         Total += secs;
 211         return up;
 212 }
 213
 214 int
 215 main(int argc, char **argv)
 216 {
 217         FILE *fp;
 218         int c;
 219
 220         setlocale(LC_TIME, "");
 221
 222         fp = NULL;
 223         while ((c = getopt(argc, argv, "Dc:dpt:w:")) != -1) {
 224                 switch (c) {
 225 #ifdef DEBUG
 226                 case 'D':
 227                         Debug++;
 228                         break;
 229 #endif
 230                 case 'c':
 231 #ifdef CONSOLE_TTY
 232                         Console = optarg;
 233 #else
 234                         usage();                /* XXX */
 235 #endif
 236                         break;
 237                 case 'd':
 238                         Flags |= AC_D;
 239                         break;
 240                 case 'p':
 241                         Flags |= AC_P;
 242                         break;
 243                 case 't':                       /* only do specified ttys */
 244                         add_tty(optarg);
 245                         break;
 246                 case 'w':
 247                         fp = file(optarg);
 248                         break;
 249                 case '?':
 250                 default:
 251                         usage();
 252                         break;
 253                 }
 254         }
 255         if (optind < argc) {
 256                 /*
 257                  * initialize user list
 258                  */
 259                 for (; optind < argc; optind++) {
 260                         Users = update_user(Users, argv[optind], 0L);
 261                 }
 262                 Flags |= AC_U;                  /* freeze user list */
 263         }
 264         if (Flags & AC_D)
 265                 Flags &= ~AC_P;
 266         if (fp == NULL) {
 267                 /*
 268                  * if _PATH_WTMP does not exist, exit quietly
 269                  */
 270                 if (access(_PATH_WTMP, 0) != 0 && errno == ENOENT)
 271                         return 0;
 272
 273                 fp = file(_PATH_WTMP);
 274         }
 275         ac(fp);
 276
 277         return 0;
 278 }
 279
 280 /*
 281  * print login time in decimal hours
 282  */
 283 static void
 284 show(const char *name, time_t secs)
 285 {
 286         printf("\t%-*s %8.2f\n", UT_NAMESIZE, name,
 287             ((double)secs / 3600));
 288 }
 289
 290 static void
 291 show_users(struct user_list *list)
 292 {
 293         struct user_list *lp;
 294
 295         for (lp = list; lp; lp = lp->next)
 296                 show(lp->name, lp->secs);
 297 }
 298
 299 /*
 300  * print total login time for 24hr period in decimal hours
 301  */
 302 static void
 303 show_today(struct user_list *users, struct utmp_list *logins, time_t secs)
 304 {
 305         struct user_list *up;
 306         struct utmp_list *lp;
 307         char date[64];
 308         time_t yesterday = secs - 1;
 309         static int d_first = -1;
 310
 311         if (d_first < 0)
 312                 d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 313         strftime(date, sizeof(date),
 314                        d_first ? "%e %b  total" : "%b %e  total",
 315                        localtime(&yesterday));
 316
 317         /* restore the missing second */
 318         yesterday++;
 319
 320         for (lp = logins; lp != NULL; lp = lp->next) {
 321                 secs = yesterday - lp->usr.ut_time;
 322                 Users = update_user(Users, lp->usr.ut_name, secs);
 323                 lp->usr.ut_time = yesterday;    /* as if they just logged in */
 324         }
 325         secs = 0;
 326         for (up = users; up != NULL; up = up->next) {
 327                 secs += up->secs;
 328                 up->secs = 0;                   /* for next day */
 329         }
 330         if (secs)
 331                 printf("%s %11.2f\n", date, ((double)secs / 3600));
 332 }
 333
 334 /*
 335  * log a user out and update their times.
 336  * if ut_line is "~", we log all users out as the system has
 337  * been shut down.
 338  */
 339 static struct utmp_list *
 340 log_out(struct utmp_list *head, struct utmp *up)
 341 {
 342         struct utmp_list *lp, *lp2, *tlp;
 343         time_t secs;
 344
 345         for (lp = head, lp2 = NULL; lp != NULL; )
 346                 if (*up->ut_line == '~' || strncmp(lp->usr.ut_line, up->ut_line,
 347                     sizeof(up->ut_line)) == 0) {
 348                         secs = up->ut_time - lp->usr.ut_time;
 349                         Users = update_user(Users, lp->usr.ut_name, secs);
 350 #ifdef DEBUG
 351                         if (Debug)
 352                                 printf("%-.*s %-.*s: %-.*s logged out (%2d:%02d:%02d)\n",
 353                                     19, ctime(&up->ut_time),
 354                                     sizeof(lp->usr.ut_line), lp->usr.ut_line,
 355                                     sizeof(lp->usr.ut_name), lp->usr.ut_name,
 356                                     secs / 3600, (secs % 3600) / 60, secs % 60);
 357 #endif
 358                         /*
 359                          * now lose it
 360                          */
 361                         tlp = lp;
 362                         lp = lp->next;
 363                         if (tlp == head)
 364                                 head = lp;
 365                         else if (lp2 != NULL)
 366                                 lp2->next = lp;
 367                         free(tlp);
 368                 } else {
 369                         lp2 = lp;
 370                         lp = lp->next;
 371                 }
 372         return head;
 373 }
 374
 375
 376 /*
 377  * if do_tty says ok, login a user
 378  */
 379 static struct utmp_list *
 380 log_in(struct utmp_list *head, struct utmp *up)
 381 {
 382         struct utmp_list *lp;
 383
 384         /*
 385          * this could be a login. if we're not dealing with
 386          * the console name, say it is.
 387          *
 388          * If we are, and if ut_host==":0.0" we know that it
 389          * isn't a real login. _But_ if we have not yet recorded
 390          * someone being logged in on Console - due to the wtmp
 391          * file starting after they logged in, we'll pretend they
 392          * logged in, at the start of the wtmp file.
 393          */
 394
 395 #ifdef CONSOLE_TTY
 396         if (up->ut_host[0] == ':') {
 397                 /*
 398                  * SunOS 4.0.2 does not treat ":0.0" as special but we
 399                  * do.
 400                  */
 401                 if (on_console(head))
 402                         return head;
 403                 /*
 404                  * ok, no recorded login, so they were here when wtmp
 405                  * started!  Adjust ut_time!
 406                  */
 407                 up->ut_time = FirstTime;
 408                 /*
 409                  * this allows us to pick the right logout
 410                  */
 411                 strncpy(up->ut_line, Console, sizeof(up->ut_line) - 1);
 412                 up->ut_line[sizeof(up->ut_line) - 1] = '\0'; /* paranoid! */
 413         }
 414 #endif
 415         /*
 416          * If we are doing specified ttys only, we ignore
 417          * anything else.
 418          */
 419         if (Flags & AC_T)
 420                 if (!do_tty(up->ut_line))
 421                         return head;
 422
 423         /*
 424          * go ahead and log them in
 425          */
 426         if ((lp = NEW(struct utmp_list)) == NULL)
 427                 errx(1, "malloc failed");
 428         lp->next = head;
 429         head = lp;
 430         memmove((char *)&lp->usr, (char *)up, sizeof(struct utmp));
 431 #ifdef DEBUG
 432         if (Debug) {
 433                 printf("%-.*s %-.*s: %-.*s logged in", 19,
 434                     ctime(&lp->usr.ut_time), sizeof(up->ut_line),
 435                        up->ut_line, sizeof(up->ut_name), up->ut_name);
 436                 if (*up->ut_host)
 437                         printf(" (%-.*s)", sizeof(up->ut_host), up->ut_host);
 438                 putchar('\n');
 439         }
 440 #endif
 441         return head;
 442 }
 443
 444 static int
 445 ac(FILE *fp)
 446 {
 447         struct utmp_list *lp, *head = NULL;
 448         struct utmp usr;
 449         struct tm *ltm;
 450         time_t secs;
 451         int day = -1;
 452
 453         secs = 0;
 454
 455         while (fread((char *)&usr, sizeof(usr), 1, fp) == 1) {
 456                 if (!FirstTime)
 457                         FirstTime = usr.ut_time;
 458                 if (Flags & AC_D) {
 459                         ltm = localtime(&usr.ut_time);
 460                         if (day >= 0 && day != ltm->tm_yday) {
 461                                 day = ltm->tm_yday;
 462                                 /*
 463                                  * print yesterday's total
 464                                  */
 465                                 secs = usr.ut_time;
 466                                 secs -= ltm->tm_sec;
 467                                 secs -= 60 * ltm->tm_min;
 468                                 secs -= 3600 * ltm->tm_hour;
 469                                 show_today(Users, head, secs);
 470                         } else
 471                                 day = ltm->tm_yday;
 472                 }
 473                 switch(*usr.ut_line) {
 474                 case '|':
 475                         secs = usr.ut_time;
 476                         break;
 477                 case '{':
 478                         secs -= usr.ut_time;
 479                         /*
 480                          * adjust time for those logged in
 481                          */
 482                         for (lp = head; lp != NULL; lp = lp->next)
 483                                 lp->usr.ut_time -= secs;
 484                         break;
 485                 case '~':                       /* reboot or shutdown */
 486                         head = log_out(head, &usr);
 487                         FirstTime = usr.ut_time; /* shouldn't be needed */
 488                         break;
 489                 default:
 490                         /*
 491                          * if they came in on tty[p-sP-S]*, then it is only
 492                          * a login session if the ut_host field is non-empty
 493                          */
 494                         if (*usr.ut_name) {
 495                                 if (strncmp(usr.ut_line, "tty", 3) != 0 ||
 496                                     strchr("pqrsPQRS", usr.ut_line[3]) == 0 ||
 497                                     *usr.ut_host != '\0')
 498                                         head = log_in(head, &usr);
 499                         } else
 500                                 head = log_out(head, &usr);
 501                         break;
 502                 }
 503         }
 504         fclose(fp);
 505         if (!(Flags & AC_W))
 506                 usr.ut_time = time(NULL);
 507         strcpy(usr.ut_line, "~");
 508
 509         if (Flags & AC_D) {
 510                 ltm = localtime(&usr.ut_time);
 511                 if (day >= 0 && day != ltm->tm_yday) {
 512                         /*
 513                          * print yesterday's total
 514                          */
 515                         secs = usr.ut_time;
 516                         secs -= ltm->tm_sec;
 517                         secs -= 60 * ltm->tm_min;
 518                         secs -= 3600 * ltm->tm_hour;
 519                         show_today(Users, head, secs);
 520                 }
 521         }
 522         /*
 523          * anyone still logged in gets time up to now
 524          */
 525         head = log_out(head, &usr);
 526
 527         if (Flags & AC_D)
 528                 show_today(Users, head, time(NULL));
 529         else {
 530                 if (Flags & AC_P)
 531                         show_users(Users);
 532                 show("total", Total);
 533         }
 534         return 0;
 535 }
 536
 537 static void
 538 usage(void)
 539 {
 540         fprintf(stderr,
 541 #ifdef CONSOLE_TTY
 542             "ac [-dp] [-c console] [-t tty] [-w wtmp] [users ...]\n");
 543 #else
 544             "ac [-dp] [-t tty] [-w wtmp] [users ...]\n");
 545 #endif
 546         exit(1);
 547 }