at.tproj/at.c

   1 /*
   2  *  at.c : Put file into atrun queue
   3  *  Copyright (C) 1993, 1994 Thomas Koenig
   4  *
   5  *  Atrun & Atq modifications
   6  *  Copyright (C) 1993  David Parsons
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. The name of the author(s) may not be used to endorse or promote
  14  *    products derived from this software without specific prior written
  15  *    permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD: src/usr.bin/at/at.c,v 1.29 2002/07/22 11:32:16 robert Exp $");
  31
  32 #define _USE_BSD 1
  33
  34 /* System Headers */
  35
  36 #include <sys/param.h>
  37 #include <sys/stat.h>
  38 #include <sys/time.h>
  39 #include <sys/wait.h>
  40 #include <ctype.h>
  41 #include <dirent.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #ifndef __FreeBSD__
  46 #include <getopt.h>
  47 #endif
  48 #include <glob.h>
  49 #ifdef __FreeBSD__
  50 #include <locale.h>
  51 #endif
  52 #include <pwd.h>
  53 #include <signal.h>
  54 #include <stddef.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <time.h>
  59 #include <unistd.h>
  60
  61 #ifdef __APPLE__
  62 #include <get_compat.h>
  63 #else  /* !__APPLE */
  64 #define COMPAT_MODE(a,b) (1)
  65 #endif /* __APPLE__ */
  66
  67 /* Local headers */
  68
  69 #include "at.h"
  70 #include "panic.h"
  71 #include "parsetime.h"
  72 #include "pathnames.h"
  73 #include "perm.h"
  74
  75 #define MAIN
  76 #include "privs.h"
  77
  78 /* Macros */
  79
  80 #ifndef ATJOB_DIR
  81 #define ATJOB_DIR _PATH_ATJOBS
  82 #endif
  83
  84 #ifndef LFILE
  85 #define LFILE ATJOB_DIR ".lockfile"
  86 #endif
  87
  88 #ifndef ATJOB_MX
  89 #define ATJOB_MX 255
  90 #endif
  91
  92 #define ALARMC 10 /* Number of seconds to wait for timeout */
  93
  94 #define SIZE 255
  95 #define TIMESIZE 50
  96
  97 enum { ATQ, ATRM, AT, BATCH, CAT };     /* what program we want to run */
  98
  99 /* File scope variables */
 100
 101 const char *no_export[] =
 102 {
 103     "TERM", "TERMCAP", "DISPLAY", "_"
 104 } ;
 105 static int send_mail = 0;
 106
 107 /* External variables */
 108
 109 extern char **environ;
 110 int fcreated;
 111 char atfile[] = ATJOB_DIR "12345678901234";
 112
 113 char *atinput = (char*)0;       /* where to get input from */
 114 char atqueue = 0;               /* which queue to examine for jobs (atq) */
 115 char atverify = 0;              /* verify time instead of queuing job */
 116 char *namep;
 117 int posixly_correct;            /* Behave as per POSIX */
 118 /* http://www.opengroup.org/onlinepubs/009695399/utilities/at.html */
 119
 120 /* Function declarations */
 121
 122 static void sigc(int signo);
 123 static void alarmc(int signo);
 124 static char *cwdname(void);
 125 static void writefile(time_t runtimer, char queue);
 126 static void list_jobs(long *, int);
 127 static long nextjob(void);
 128 static time_t ttime(const char *arg);
 129 static int in_job_list(long, long *, int);
 130 static long *get_job_list(int, char *[], int *);
 131
 132 /* Signal catching functions */
 133
 134 static void sigc(int signo __unused)
 135 {
 136 /* If the user presses ^C, remove the spool file and exit
 137  */
 138     if (fcreated)
 139     {
 140         PRIV_START
 141             unlink(atfile);
 142         PRIV_END
 143     }
 144
 145     _exit(EXIT_FAILURE);
 146 }
 147
 148 static void alarmc(int signo __unused)
 149 {
 150     char buf[1024];
 151
 152     /* Time out after some seconds. */
 153     strlcpy(buf, namep, sizeof(buf));
 154     strlcat(buf, ": file locking timed out\n", sizeof(buf));
 155     write(STDERR_FILENO, buf, strlen(buf));
 156     sigc(0);
 157 }
 158
 159 /* Local functions */
 160
 161 static char *cwdname(void)
 162 {
 163 /* Read in the current directory; the name will be overwritten on
 164  * subsequent calls.
 165  */
 166     static char *ptr = NULL;
 167     static size_t size = SIZE;
 168
 169     if (ptr == NULL)
 170         if ((ptr = malloc(size)) == NULL)
 171             errx(EXIT_FAILURE, "virtual memory exhausted");
 172
 173     while (1)
 174     {
 175         if (ptr == NULL)
 176             panic("out of memory");
 177
 178         if (getcwd(ptr, size-1) != NULL)
 179             return ptr;
 180
 181         if (errno != ERANGE)
 182             perr("cannot get directory");
 183
 184         free (ptr);
 185         size += SIZE;
 186         if ((ptr = malloc(size)) == NULL)
 187             errx(EXIT_FAILURE, "virtual memory exhausted");
 188     }
 189 }
 190
 191 static long
 192 nextjob()
 193 {
 194     long jobno;
 195     FILE *fid;
 196
 197     if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != (FILE*)0) {
 198         if (fscanf(fid, "%5lx", &jobno) == 1) {
 199             rewind(fid);
 200             jobno = (1+jobno) % 0xfffff;        /* 2^20 jobs enough? */
 201             fprintf(fid, "%05lx\n", jobno);
 202         }
 203         else
 204             jobno = EOF;
 205         fclose(fid);
 206         return jobno;
 207     }
 208     else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != (FILE*)0) {
 209         fprintf(fid, "%05lx\n", jobno = 1);
 210         fclose(fid);
 211         return 1;
 212     }
 213     return EOF;
 214 }
 215
 216 static void
 217 writefile(time_t runtimer, char queue)
 218 {
 219 /* This does most of the work if at or batch are invoked for writing a job.
 220  */
 221     long jobno;
 222     char *ap, *ppos, *mailname;
 223     struct passwd *pass_entry;
 224     struct stat statbuf;
 225     int fdes, lockdes, fd2;
 226     FILE *fp, *fpin;
 227     struct sigaction act;
 228     char **atenv;
 229     int ch;
 230     mode_t cmask;
 231     struct flock lock;
 232
 233 #ifdef __FreeBSD__
 234     (void) setlocale(LC_TIME, "");
 235 #endif
 236
 237 /* Install the signal handler for SIGINT; terminate after removing the
 238  * spool file if necessary
 239  */
 240     act.sa_handler = sigc;
 241     sigemptyset(&(act.sa_mask));
 242     act.sa_flags = 0;
 243
 244     sigaction(SIGINT, &act, NULL);
 245
 246     ppos = atfile + strlen(ATJOB_DIR);
 247
 248     /* Loop over all possible file names for running something at this
 249      * particular time, see if a file is there; the first empty slot at any
 250      * particular time is used.  Lock the file LFILE first to make sure
 251      * we're alone when doing this.
 252      */
 253
 254     PRIV_START
 255
 256     if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
 257         perr("cannot open lockfile " LFILE);
 258
 259     lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
 260     lock.l_len = 0;
 261
 262     act.sa_handler = alarmc;
 263     sigemptyset(&(act.sa_mask));
 264     act.sa_flags = 0;
 265
 266     /* Set an alarm so a timeout occurs after ALARMC seconds, in case
 267      * something is seriously broken.
 268      */
 269     sigaction(SIGALRM, &act, NULL);
 270     alarm(ALARMC);
 271     fcntl(lockdes, F_SETLKW, &lock);
 272     alarm(0);
 273
 274     if ((jobno = nextjob()) == EOF)
 275         perr("cannot generate job number");
 276
 277     sprintf(ppos, "%c%5lx%8lx", queue,
 278             jobno, (unsigned long) (runtimer/60));
 279
 280     for(ap=ppos; *ap != '\0'; ap ++)
 281         if (*ap == ' ')
 282             *ap = '0';
 283
 284     if (stat(atfile, &statbuf) != 0)
 285         if (errno != ENOENT)
 286             perr("cannot access " ATJOB_DIR);
 287
 288     /* Create the file. The x bit is only going to be set after it has
 289      * been completely written out, to make sure it is not executed in the
 290      * meantime.  To make sure they do not get deleted, turn off their r
 291      * bit.  Yes, this is a kluge.
 292      */
 293     cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
 294     if ((fdes = creat(atfile, O_WRONLY)) == -1)
 295         perr("cannot create atjob file");
 296
 297     if ((fd2 = dup(fdes)) <0)
 298         perr("error in dup() of job file");
 299
 300     if(fchown(fd2, real_uid, real_gid) != 0)
 301         perr("cannot give away file");
 302
 303     PRIV_END
 304
 305     /* We no longer need suid root; now we just need to be able to write
 306      * to the directory, if necessary.
 307      */
 308
 309     REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 310
 311     /* We've successfully created the file; let's set the flag so it
 312      * gets removed in case of an interrupt or error.
 313      */
 314     fcreated = 1;
 315
 316     /* Now we can release the lock, so other people can access it
 317      */
 318     lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
 319     lock.l_len = 0;
 320     fcntl(lockdes, F_SETLKW, &lock);
 321     close(lockdes);
 322
 323     if((fp = fdopen(fdes, "w")) == NULL)
 324         panic("cannot reopen atjob file");
 325
 326     /* Get the userid to mail to, first by trying getlogin(),
 327      * then from LOGNAME, finally from getpwuid().
 328      */
 329     mailname = getlogin();
 330     if (mailname == NULL)
 331         mailname = getenv("LOGNAME");
 332
 333     if ((mailname == NULL) || (mailname[0] == '\0')
 334         || (strlen(mailname) >= MAXLOGNAME) || (getpwnam(mailname)==NULL))
 335     {
 336         pass_entry = getpwuid(real_uid);
 337         if (pass_entry != NULL)
 338             mailname = pass_entry->pw_name;
 339     }
 340
 341     if (atinput != (char *) NULL)
 342     {
 343         fpin = freopen(atinput, "r", stdin);
 344         if (fpin == NULL)
 345             perr("cannot open input file");
 346     }
 347     fprintf(fp, "#!/bin/sh\n# atrun uid=%ld gid=%ld\n# mail %.*s %d\n",
 348         (long) real_uid, (long) real_gid, MAXLOGNAME - 1, mailname,
 349         send_mail);
 350
 351     /* Write out the umask at the time of invocation
 352      */
 353     fprintf(fp, "umask %lo\n", (unsigned long) cmask);
 354
 355     /* Write out the environment. Anything that may look like a
 356      * special character to the shell is quoted, except for \n, which is
 357      * done with a pair of "'s.  Don't export the no_export list (such
 358      * as TERM or DISPLAY) because we don't want these.
 359      */
 360     for (atenv= environ; *atenv != NULL; atenv++)
 361     {
 362         int export = 1;
 363         char *eqp;
 364
 365         eqp = strchr(*atenv, '=');
 366         if (ap == NULL)
 367             eqp = *atenv;
 368         else
 369         {
 370             size_t i;
 371             for (i=0; i<sizeof(no_export)/sizeof(no_export[0]); i++)
 372             {
 373                 export = export
 374                     && (strncmp(*atenv, no_export[i],
 375                                 (size_t) (eqp-*atenv)) != 0);
 376             }
 377             eqp++;
 378         }
 379
 380         if (export)
 381         {
 382             fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
 383             for(ap = eqp;*ap != '\0'; ap++)
 384             {
 385                 if (*ap == '\n')
 386                     fprintf(fp, "\"\n\"");
 387                 else
 388                 {
 389                     if (!isalnum(*ap)) {
 390                         switch (*ap) {
 391                           case '%': case '/': case '{': case '[':
 392                           case ']': case '=': case '}': case '@':
 393                           case '+': case '#': case ',': case '.':
 394                           case ':': case '-': case '_':
 395                             break;
 396                           default:
 397                             fputc('\\', fp);
 398                             break;
 399                         }
 400                     }
 401                     fputc(*ap, fp);
 402                 }
 403             }
 404             fputs("; export ", fp);
 405             fwrite(*atenv, sizeof(char), eqp-*atenv -1, fp);
 406             fputc('\n', fp);
 407
 408         }
 409     }
 410     /* Cd to the directory at the time and write out all the
 411      * commands the user supplies from stdin.
 412      */
 413     fprintf(fp, "cd ");
 414     for (ap = cwdname(); *ap != '\0'; ap++)
 415     {
 416         if (*ap == '\n')
 417             fprintf(fp, "\"\n\"");
 418         else
 419         {
 420             if (*ap != '/' && !isalnum(*ap))
 421                 fputc('\\', fp);
 422
 423             fputc(*ap, fp);
 424         }
 425     }
 426     /* Test cd's exit status: die if the original directory has been
 427      * removed, become unreadable or whatever
 428      */
 429     fprintf(fp, " || {\n\t echo 'Execution directory "
 430                 "inaccessible' >&2\n\t exit 1\n}\n");
 431
 432     while((ch = getchar()) != EOF)
 433         fputc(ch, fp);
 434
 435     fprintf(fp, "\n");
 436     if (ferror(fp))
 437         panic("output error");
 438
 439     if (ferror(stdin))
 440         panic("input error");
 441
 442     fclose(fp);
 443
 444     /* Set the x bit so that we're ready to start executing
 445      */
 446
 447     if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
 448         perr("cannot give away file");
 449
 450     close(fd2);
 451     if (posixly_correct) {
 452         struct tm runtime;
 453         char timestr[TIMESIZE];
 454         runtime = *localtime(&runtimer);
 455         strftime(timestr, TIMESIZE, "%a %b %e %T %Y", &runtime);
 456         fprintf(stderr, "job %ld at %s\n", jobno, timestr);
 457     } else
 458         fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
 459 }
 460
 461 static int
 462 in_job_list(long job, long *joblist, int len)
 463 {
 464     int i;
 465
 466     for (i = 0; i < len; i++)
 467         if (job == joblist[i])
 468             return 1;
 469
 470     return 0;
 471 }
 472
 473 static void
 474 list_one_job(char *name, long *joblist, int len, int *first)
 475 {
 476     struct stat buf;
 477     struct tm runtime;
 478     unsigned long ctm;
 479     char queue;
 480     long jobno;
 481     time_t runtimer;
 482     char timestr[TIMESIZE];
 483
 484     if (stat(name, &buf) != 0)
 485         perr("cannot stat in " ATJOB_DIR);
 486
 487     /* See it's a regular file and has its x bit turned on and
 488      * is the user's
 489      */
 490     if (!S_ISREG(buf.st_mode)
 491         || ((buf.st_uid != real_uid) && ! (real_uid == 0))
 492         || !(S_IXUSR & buf.st_mode || atverify))
 493         return;
 494
 495     if(sscanf(name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
 496         return;
 497
 498     /* If jobs are given, only list those jobs */
 499     if (joblist && !in_job_list(jobno, joblist, len))
 500         return;
 501
 502     if (atqueue && (queue != atqueue))
 503         return;
 504
 505     runtimer = 60*(time_t) ctm;
 506     runtime = *localtime(&runtimer);
 507     strftime(timestr, TIMESIZE, "%a %b %e %T %Y", &runtime);
 508     if (*first) {
 509         if (!posixly_correct)
 510             printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
 511         *first=0;
 512     }
 513     if (posixly_correct)
 514         printf("%ld\t%s\n", jobno, timestr);
 515     else {
 516         struct passwd *pw = getpwuid(buf.st_uid);
 517
 518         printf("%s\t%s\t%c%s\t%s\n",
 519                timestr,
 520                pw ? pw->pw_name : "???",
 521                queue,
 522                (S_IXUSR & buf.st_mode) ? "":"(done)",
 523                name);
 524     }
 525 }
 526
 527 static void
 528 list_jobs(long *joblist, int len)
 529 {
 530     /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
 531      * or everybody's if we are root
 532      */
 533     DIR *spool;
 534     struct dirent *dirent;
 535     int first=1;
 536
 537 #ifdef __FreeBSD__
 538     (void) setlocale(LC_TIME, "");
 539 #endif
 540
 541     PRIV_START
 542
 543     if (chdir(ATJOB_DIR) != 0)
 544         perr("cannot change to " ATJOB_DIR);
 545
 546     if (joblist) {              /* Force order to match POSIX */
 547         char jobglob[32];
 548         glob_t g;
 549         int i;
 550
 551         sprintf(jobglob, "?%05lx*", joblist[0]);
 552         g.gl_offs = 0;
 553         glob(jobglob, GLOB_DOOFFS, NULL, &g);
 554         for (i = 1; i < len; i++) {
 555             sprintf(jobglob, "?%05lx*", joblist[i]);
 556             glob(jobglob, GLOB_DOOFFS | GLOB_APPEND, NULL, &g);
 557         }
 558         for (i = 0; i < g.gl_pathc; i++) {
 559             list_one_job(g.gl_pathv[i], joblist, len, &first);
 560         }
 561         globfree(&g);
 562     } else {
 563         if ((spool = opendir(".")) == NULL)
 564             perr("cannot open " ATJOB_DIR);
 565
 566         /*      Loop over every file in the directory
 567          */
 568         while((dirent = readdir(spool)) != NULL) {
 569            list_one_job(dirent->d_name, joblist, len, &first);
 570         }
 571         closedir(spool);
 572     }
 573     PRIV_END
 574 }
 575
 576 static void
 577 process_jobs(int argc, char **argv, int what)
 578 {
 579     /* Delete every argument (job - ID) given
 580      */
 581     int i;
 582     struct stat buf;
 583     DIR *spool;
 584     struct dirent *dirent;
 585     unsigned long ctm;
 586     char queue;
 587     long jobno;
 588
 589     PRIV_START
 590
 591     if (chdir(ATJOB_DIR) != 0)
 592         perr("cannot change to " ATJOB_DIR);
 593
 594     if ((spool = opendir(".")) == NULL)
 595         perr("cannot open " ATJOB_DIR);
 596
 597     PRIV_END
 598
 599     /*  Loop over every file in the directory
 600      */
 601     while((dirent = readdir(spool)) != NULL) {
 602
 603         PRIV_START
 604         if (stat(dirent->d_name, &buf) != 0)
 605             perr("cannot stat in " ATJOB_DIR);
 606         PRIV_END
 607
 608         if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
 609             continue;
 610
 611         for (i=optind; i < argc; i++) {
 612             if (atoi(argv[i]) == jobno || strcmp(argv[i], dirent->d_name)==0) {
 613                 if ((buf.st_uid != real_uid) && !(real_uid == 0))
 614                     errx(EXIT_FAILURE, "%s: not owner", argv[i]);
 615                 switch (what) {
 616                   case ATRM:
 617
 618                     PRIV_START
 619
 620                     if (unlink(dirent->d_name) != 0)
 621                         perr(dirent->d_name);
 622
 623                     PRIV_END
 624
 625                     break;
 626
 627                   case CAT:
 628                     {
 629                         FILE *fp;
 630                         int ch;
 631
 632                         PRIV_START
 633
 634                         fp = fopen(dirent->d_name,"r");
 635
 636                         PRIV_END
 637
 638                         if (!fp) {
 639                             perr("cannot open file");
 640                         }
 641                         while((ch = getc(fp)) != EOF) {
 642                             putchar(ch);
 643                         }
 644                     }
 645                     break;
 646
 647                   default:
 648                     errx(EXIT_FAILURE, "internal error, process_jobs = %d",
 649                         what);
 650                 }
 651             }
 652         }
 653     }
 654 } /* process_jobs */
 655
 656 #define ATOI2(ar)       ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
 657
 658 static time_t
 659 ttime(const char *arg)
 660 {
 661     /*
 662      * This is pretty much a copy of stime_arg1() from touch.c.  I changed
 663      * the return value and the argument list because it's more convenient
 664      * (IMO) to do everything in one place. - Joe Halpin
 665      */
 666     struct timeval tv[2];
 667     time_t now;
 668     struct tm *t;
 669     int yearset;
 670     char *p;
 671
 672     if (gettimeofday(&tv[0], NULL))
 673         panic("Cannot get current time");
 674
 675     /* Start with the current time. */
 676     now = tv[0].tv_sec;
 677     if ((t = localtime(&now)) == NULL)
 678         panic("localtime");
 679     /* [[CC]YY]MMDDhhmm[.SS] */
 680     if ((p = strchr(arg, '.')) == NULL)
 681         t->tm_sec = 0;          /* Seconds defaults to 0. */
 682     else {
 683         if (strlen(p + 1) != 2)
 684             goto terr;
 685         *p++ = '\0';
 686         t->tm_sec = ATOI2(p);
 687     }
 688
 689     yearset = 0;
 690     switch(strlen(arg)) {
 691     case 12:                    /* CCYYMMDDhhmm */
 692         t->tm_year = ATOI2(arg);
 693         t->tm_year *= 100;
 694         yearset = 1;
 695         /* FALLTHROUGH */
 696     case 10:                    /* YYMMDDhhmm */
 697         if (yearset) {
 698             yearset = ATOI2(arg);
 699             t->tm_year += yearset;
 700         } else {
 701             yearset = ATOI2(arg);
 702             t->tm_year = yearset + 2000;
 703         }
 704         t->tm_year -= 1900;     /* Convert to UNIX time. */
 705         /* FALLTHROUGH */
 706     case 8:                             /* MMDDhhmm */
 707         t->tm_mon = ATOI2(arg);
 708         --t->tm_mon;            /* Convert from 01-12 to 00-11 */
 709         t->tm_mday = ATOI2(arg);
 710         t->tm_hour = ATOI2(arg);
 711         t->tm_min = ATOI2(arg);
 712         break;
 713     default:
 714         goto terr;
 715     }
 716
 717     t->tm_isdst = -1;           /* Figure out DST. */
 718     tv[0].tv_sec = tv[1].tv_sec = mktime(t);
 719     if (tv[0].tv_sec != -1)
 720         return tv[0].tv_sec;
 721     else
 722 terr:
 723         panic(
 724            "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
 725 }
 726
 727 static long *
 728 get_job_list(int argc, char *argv[], int *joblen)
 729 {
 730     int i, len;
 731     long *joblist;
 732     char *ep;
 733
 734     joblist = NULL;
 735     len = argc;
 736     if (len > 0) {
 737         if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
 738             panic("out of memory");
 739
 740         for (i = 0; i < argc; i++) {
 741             errno = 0;
 742             if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
 743                 ep == argv[i] || *ep != '\0' || errno)
 744                 panic("invalid job number");
 745         }
 746     }
 747
 748     *joblen = len;
 749     return joblist;
 750 }
 751
 752 int
 753 main(int argc, char **argv)
 754 {
 755     int c;
 756     char queue = DEFAULT_AT_QUEUE;
 757     char queue_set = 0;
 758     char *pgm;
 759
 760     int program = AT;                   /* our default program */
 761     const char *options = "q:f:t:rmvldbc"; /* default options for at */
 762     time_t timer;
 763     long *joblist;
 764     int joblen;
 765
 766     posixly_correct = COMPAT_MODE("bin/at", "Unix2003");
 767     joblist = NULL;
 768     joblen = 0;
 769     timer = -1;
 770     RELINQUISH_PRIVS
 771
 772     /* Eat any leading paths
 773      */
 774     if ((pgm = strrchr(argv[0], '/')) == NULL)
 775         pgm = argv[0];
 776     else
 777         pgm++;
 778
 779     namep = pgm;
 780
 781     /* find out what this program is supposed to do
 782      */
 783     if (strcmp(pgm, "atq") == 0) {
 784         program = ATQ;
 785         options = "q:v";
 786     }
 787     else if (strcmp(pgm, "atrm") == 0) {
 788         program = ATRM;
 789         options = "";
 790     }
 791     else if (strcmp(pgm, "batch") == 0) {
 792         program = BATCH;
 793         options = "f:q:mv";
 794     }
 795
 796     /* process whatever options we can process
 797      */
 798     opterr=1;
 799     while ((c=getopt(argc, argv, options)) != -1)
 800         switch (c) {
 801         case 'v':   /* verify time settings */
 802             atverify = 1;
 803             break;
 804
 805         case 'm':   /* send mail when job is complete */
 806             send_mail = 1;
 807             break;
 808
 809         case 'f':
 810             atinput = optarg;
 811             break;
 812
 813         case 'q':    /* specify queue */
 814             if (strlen(optarg) > 1)
 815                 usage();
 816
 817             atqueue = queue = *optarg;
 818             if (!(islower(queue)||isupper(queue)))
 819                 usage();
 820
 821             queue_set = 1;
 822             break;
 823
 824         case 'd':
 825             warnx("-d is deprecated; use -r instead");
 826             /* fall through to 'r' */
 827
 828         case 'r':
 829             if (program != AT)
 830                 usage();
 831
 832             program = ATRM;
 833             options = "";
 834             break;
 835
 836         case 't':
 837             if (program != AT)
 838                 usage();
 839             timer = ttime(optarg);
 840             break;
 841
 842         case 'l':
 843             if (program != AT)
 844                 usage();
 845
 846             program = ATQ;
 847             options = "q:";
 848             break;
 849
 850         case 'b':
 851             if (program != AT)
 852                 usage();
 853
 854             program = BATCH;
 855             options = "f:q:mv";
 856             break;
 857
 858         case 'c':
 859             program = CAT;
 860             options = "";
 861             break;
 862
 863         default:
 864             usage();
 865             break;
 866         }
 867     /* end of options eating
 868      */
 869
 870     /* select our program
 871      */
 872     if(!check_permission())
 873         errx(EXIT_FAILURE, "you do not have permission to use this program");
 874     switch (program) {
 875     case ATQ:
 876
 877         REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 878
 879         if (queue_set == 0)
 880             joblist = get_job_list(argc - optind, argv + optind, &joblen);
 881         list_jobs(joblist, joblen);
 882         break;
 883
 884     case ATRM:
 885
 886         REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 887
 888         process_jobs(argc, argv, ATRM);
 889         break;
 890
 891     case CAT:
 892
 893         process_jobs(argc, argv, CAT);
 894         break;
 895
 896     case AT:
 897         /*
 898          * If timer is > -1, then the user gave the time with -t.  In that
 899          * case, it's already been set. If not, set it now.
 900          */
 901         if (timer == -1)
 902             timer = parsetime(argc, argv);
 903
 904         if (atverify)
 905         {
 906             struct tm *tm = localtime(&timer);
 907             fprintf(stderr, "%s\n", asctime(tm));
 908         }
 909         writefile(timer, queue);
 910         break;
 911
 912     case BATCH:
 913         if (queue_set)
 914             queue = toupper(queue);
 915         else
 916             queue = DEFAULT_BATCH_QUEUE;
 917
 918         if (argc > optind)
 919             timer = parsetime(argc, argv);
 920         else
 921             timer = time(NULL);
 922
 923         if (atverify)
 924         {
 925             struct tm *tm = localtime(&timer);
 926             fprintf(stderr, "%s\n", asctime(tm));
 927         }
 928
 929         writefile(timer, queue);
 930         break;
 931
 932     default:
 933         panic("internal error");
 934         break;
 935     }
 936     exit(EXIT_SUCCESS);
 937 }