usr.bin/at/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  * $FreeBSD: src/usr.bin/at/at.c,v 1.30 2007/09/21 01:55:11 kevlo Exp $
  29  */
  30
  31 #define _USE_BSD 1
  32
  33 /* System Headers */
  34
  35 #include <sys/param.h>
  36 #include <sys/stat.h>
  37 #include <sys/time.h>
  38 #include <sys/wait.h>
  39 #include <ctype.h>
  40 #include <dirent.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <langinfo.h>
  45 #include <locale.h>
  46 #include <pwd.h>
  47 #include <signal.h>
  48 #include <stddef.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <time.h>
  53 #include <unistd.h>
  54
  55 /* Local headers */
  56
  57 #include "at.h"
  58 #include "panic.h"
  59 #include "parsetime.h"
  60 #include "perm.h"
  61
  62 #define MAIN
  63 #include "privs.h"
  64
  65 /* Macros */
  66
  67 #ifndef ATJOB_DIR
  68 #define ATJOB_DIR "/usr/spool/atjobs/"
  69 #endif
  70
  71 #ifndef LFILE
  72 #define LFILE ATJOB_DIR ".lockfile"
  73 #endif
  74
  75 #ifndef ATJOB_MX
  76 #define ATJOB_MX 255
  77 #endif
  78
  79 #define ALARMC 10 /* Number of seconds to wait for timeout */
  80
  81 #define SIZE 255
  82 #define TIMESIZE 50
  83
  84 enum { ATQ, ATRM, AT, BATCH, CAT };     /* what program we want to run */
  85
  86 /* File scope variables */
  87
  88 const char *no_export[] =
  89 {
  90     "TERM", "TERMCAP", "DISPLAY", "_"
  91 } ;
  92 static int send_mail = 0;
  93
  94 /* External variables */
  95 uid_t real_uid, effective_uid;
  96 gid_t real_gid, effective_gid;
  97
  98 extern char **environ;
  99 int fcreated;
 100 char atfile[sizeof(ATJOB_DIR) + 14] = ATJOB_DIR;
 101
 102 char *atinput = NULL;           /* where to get input from */
 103 char atqueue = 0;               /* which queue to examine for jobs (atq) */
 104 char atverify = 0;              /* verify time instead of queuing job */
 105 char *namep;
 106
 107 /* Function declarations */
 108
 109 static void sigc(int signo);
 110 static void alarmc(int signo);
 111 static char *cwdname(void);
 112 static void writefile(time_t runtimer, char queue);
 113 static void list_jobs(long *, int);
 114 static long nextjob(void);
 115 static time_t ttime(const char *arg);
 116 static char * timer2str(time_t runtimer);
 117 static int in_job_list(long, long *, int);
 118 static long *get_job_list(int, char *[], int *);
 119
 120 /* Signal catching functions */
 121
 122 static void
 123 sigc(int signo __unused)
 124 {
 125 /* If the user presses ^C, remove the spool file and exit
 126  */
 127     if (fcreated)
 128     {
 129         PRIV_START
 130             unlink(atfile);
 131         PRIV_END
 132     }
 133
 134     _exit(EXIT_FAILURE);
 135 }
 136
 137 static void
 138 alarmc(int signo __unused)
 139 {
 140     char buf[1024];
 141
 142     /* Time out after some seconds. */
 143     strlcpy(buf, namep, sizeof(buf));
 144     strlcat(buf, ": file locking timed out\n", sizeof(buf));
 145     write(STDERR_FILENO, buf, strlen(buf));
 146     sigc(0);
 147 }
 148
 149 /* Local functions */
 150
 151 static char *
 152 cwdname(void)
 153 {
 154 /* Read in the current directory; the name will be overwritten on
 155  * subsequent calls.
 156  */
 157     static char *ptr = NULL;
 158     static size_t size = SIZE;
 159
 160     if (ptr == NULL)
 161         if ((ptr = malloc(size)) == NULL)
 162             errx(EXIT_FAILURE, "virtual memory exhausted");
 163
 164     while (1)
 165     {
 166         if (ptr == NULL)
 167             panic("out of memory");
 168
 169         if (getcwd(ptr, size-1) != NULL)
 170             return ptr;
 171
 172         if (errno != ERANGE)
 173             perr("cannot get directory");
 174
 175         free (ptr);
 176         size += SIZE;
 177         if ((ptr = malloc(size)) == NULL)
 178             errx(EXIT_FAILURE, "virtual memory exhausted");
 179     }
 180 }
 181
 182 static long
 183 nextjob(void)
 184 {
 185     long jobno;
 186     FILE *fid;
 187
 188     if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
 189         if (fscanf(fid, "%5lx", &jobno) == 1) {
 190             rewind(fid);
 191             jobno = (1+jobno) % 0xfffff;        /* 2^20 jobs enough? */
 192             fprintf(fid, "%05lx\n", jobno);
 193         }
 194         else
 195             jobno = EOF;
 196         fclose(fid);
 197         return jobno;
 198     }
 199     else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
 200         fprintf(fid, "%05lx\n", jobno = 1);
 201         fclose(fid);
 202         return 1;
 203     }
 204     return EOF;
 205 }
 206
 207 static void
 208 writefile(time_t runtimer, char queue)
 209 {
 210 /* This does most of the work if at or batch are invoked for writing a job.
 211  */
 212     long jobno;
 213     char *ap, *ppos, *mailname;
 214     struct passwd *pass_entry;
 215     struct stat statbuf;
 216     int fdes, lockdes, fd2;
 217     FILE *fp, *fpin;
 218     struct sigaction act;
 219     char **atenv;
 220     int ch;
 221     mode_t cmask;
 222     struct flock lock;
 223
 224     setlocale(LC_TIME, "");
 225
 226 /* Install the signal handler for SIGINT; terminate after removing the
 227  * spool file if necessary
 228  */
 229     act.sa_handler = sigc;
 230     sigemptyset(&(act.sa_mask));
 231     act.sa_flags = 0;
 232
 233     sigaction(SIGINT, &act, NULL);
 234
 235     /* Loop over all possible file names for running something at this
 236      * particular time, see if a file is there; the first empty slot at any
 237      * particular time is used.  Lock the file LFILE first to make sure
 238      * we're alone when doing this.
 239      */
 240
 241     PRIV_START
 242
 243     if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
 244         perr("cannot open lockfile " LFILE);
 245
 246     lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
 247     lock.l_len = 0;
 248
 249     act.sa_handler = alarmc;
 250     sigemptyset(&(act.sa_mask));
 251     act.sa_flags = 0;
 252
 253     /* Set an alarm so a timeout occurs after ALARMC seconds, in case
 254      * something is seriously broken.
 255      */
 256     sigaction(SIGALRM, &act, NULL);
 257     alarm(ALARMC);
 258     fcntl(lockdes, F_SETLKW, &lock);
 259     alarm(0);
 260
 261     if ((jobno = nextjob()) == EOF)
 262         perr("cannot generate job number");
 263
 264     ppos = atfile + strlen(atfile);
 265     snprintf(ppos, sizeof(atfile) - strlen(atfile), "%c%5lx%8lx", queue,
 266              jobno, (unsigned long) (runtimer/60));
 267
 268     for(ap=ppos; *ap != '\0'; ap ++)
 269         if (*ap == ' ')
 270             *ap = '0';
 271
 272     if (stat(atfile, &statbuf) != 0)
 273         if (errno != ENOENT)
 274             perr("cannot access " ATJOB_DIR);
 275
 276     /* Create the file. The x bit is only going to be set after it has
 277      * been completely written out, to make sure it is not executed in the
 278      * meantime.  To make sure they do not get deleted, turn off their r
 279      * bit.  Yes, this is a kluge.
 280      */
 281     cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
 282     if ((fdes = creat(atfile, O_WRONLY)) == -1)
 283         perr("cannot create atjob file");
 284
 285     if ((fd2 = dup(fdes)) <0)
 286         perr("error in dup() of job file");
 287
 288     if(fchown(fd2, real_uid, real_gid) != 0)
 289         perr("cannot give away file");
 290
 291     PRIV_END
 292
 293     /* We no longer need suid root; now we just need to be able to write
 294      * to the directory, if necessary.
 295      */
 296
 297     REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 298
 299     /* We've successfully created the file; let's set the flag so it
 300      * gets removed in case of an interrupt or error.
 301      */
 302     fcreated = 1;
 303
 304     /* Now we can release the lock, so other people can access it
 305      */
 306     lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
 307     lock.l_len = 0;
 308     fcntl(lockdes, F_SETLKW, &lock);
 309     close(lockdes);
 310
 311     if((fp = fdopen(fdes, "w")) == NULL)
 312         panic("cannot reopen atjob file");
 313
 314     /* Get the userid to mail to, first by trying getlogin(),
 315      * then from LOGNAME, finally from getpwuid().
 316      */
 317     mailname = getlogin();
 318     if (mailname == NULL)
 319         mailname = getenv("LOGNAME");
 320
 321     if ((mailname == NULL) || (mailname[0] == '\0')
 322         || (strlen(mailname) >= MAXLOGNAME) || (getpwnam(mailname)==NULL))
 323     {
 324         pass_entry = getpwuid(real_uid);
 325         if (pass_entry != NULL)
 326             mailname = pass_entry->pw_name;
 327     }
 328
 329     if (atinput != NULL)
 330     {
 331         fpin = freopen(atinput, "r", stdin);
 332         if (fpin == NULL)
 333             perr("cannot open input file");
 334     }
 335     fprintf(fp, "#!/bin/sh\n# atrun uid=%ld gid=%ld\n# mail %*s %d\n",
 336         (long) real_uid, (long) real_gid, MAXLOGNAME - 1, mailname,
 337         send_mail);
 338
 339     /* Write out the umask at the time of invocation
 340      */
 341     fprintf(fp, "umask %lo\n", (unsigned long) cmask);
 342
 343     /* Write out the environment. Anything that may look like a
 344      * special character to the shell is quoted, except for \n, which is
 345      * done with a pair of "'s.  Don't export the no_export list (such
 346      * as TERM or DISPLAY) because we don't want these.
 347      */
 348     for (atenv= environ; *atenv != NULL; atenv++)
 349     {
 350         int export = 1;
 351         char *eqp;
 352
 353         eqp = strchr(*atenv, '=');
 354         if (ap == NULL)
 355             eqp = *atenv;
 356         else
 357         {
 358             size_t i;
 359             for (i=0; i<NELEM(no_export); i++)
 360             {
 361                 export = export
 362                     && (strncmp(*atenv, no_export[i],
 363                                 (size_t) (eqp-*atenv)) != 0);
 364             }
 365             eqp++;
 366         }
 367
 368         if (export)
 369         {
 370             fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
 371             for(ap = eqp;*ap != '\0'; ap++)
 372             {
 373                 if (*ap == '\n')
 374                     fprintf(fp, "\"\n\"");
 375                 else
 376                 {
 377                     if (!isalnum(*ap)) {
 378                         switch (*ap) {
 379                           case '%': case '/': case '{': case '[':
 380                           case ']': case '=': case '}': case '@':
 381                           case '+': case '#': case ',': case '.':
 382                           case ':': case '-': case '_':
 383                             break;
 384                           default:
 385                             fputc('\\', fp);
 386                             break;
 387                         }
 388                     }
 389                     fputc(*ap, fp);
 390                 }
 391             }
 392             fputs("; export ", fp);
 393             fwrite(*atenv, sizeof(char), eqp-*atenv -1, fp);
 394             fputc('\n', fp);
 395
 396         }
 397     }
 398     /* Cd to the directory at the time and write out all the
 399      * commands the user supplies from stdin.
 400      */
 401     fprintf(fp, "cd ");
 402     for (ap = cwdname(); *ap != '\0'; ap++)
 403     {
 404         if (*ap == '\n')
 405             fprintf(fp, "\"\n\"");
 406         else
 407         {
 408             if (*ap != '/' && !isalnum(*ap))
 409                 fputc('\\', fp);
 410
 411             fputc(*ap, fp);
 412         }
 413     }
 414     /* Test cd's exit status: die if the original directory has been
 415      * removed, become unreadable or whatever
 416      */
 417     fprintf(fp, " || {\n\t echo 'Execution directory "
 418                 "inaccessible' >&2\n\t exit 1\n}\n");
 419
 420     while((ch = getchar()) != EOF)
 421         fputc(ch, fp);
 422
 423     fprintf(fp, "\n");
 424     if (ferror(fp))
 425         panic("output error");
 426
 427     if (ferror(stdin))
 428         panic("input error");
 429
 430     fclose(fp);
 431
 432     /* Set the x bit so that we're ready to start executing
 433      */
 434
 435     if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
 436         perr("cannot give away file");
 437
 438     close(fd2);
 439
 440     /* Print output. */
 441     char *timestr = timer2str(runtimer);
 442
 443     fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
 444     fprintf(stderr, "Job %ld at %s\n", jobno, timestr);
 445     free(timestr);
 446 }
 447
 448 static int
 449 in_job_list(long job, long *joblist, int len)
 450 {
 451     int i;
 452
 453     for (i = 0; i < len; i++)
 454         if (job == joblist[i])
 455             return 1;
 456
 457     return 0;
 458 }
 459
 460 static void
 461 list_jobs(long *joblist, int len)
 462 {
 463     /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
 464      * or everybody's if we are root
 465      */
 466     struct passwd *pw;
 467     DIR *spool;
 468     struct dirent *dirent;
 469     struct stat buf;
 470     unsigned long ctm;
 471     char queue;
 472     long jobno;
 473     time_t runtimer;
 474     char *timestr;
 475     int first=1;
 476
 477     setlocale(LC_TIME, "");
 478
 479     PRIV_START
 480
 481     if (chdir(ATJOB_DIR) != 0)
 482         perr("cannot change to " ATJOB_DIR);
 483
 484     if ((spool = opendir(".")) == NULL)
 485         perr("cannot open " ATJOB_DIR);
 486
 487     /*  Loop over every file in the directory
 488      */
 489     while((dirent = readdir(spool)) != NULL) {
 490         if (stat(dirent->d_name, &buf) != 0)
 491             perr("cannot stat in " ATJOB_DIR);
 492
 493         /* See it's a regular file and has its x bit turned on and
 494          * is the user's
 495          */
 496         if (!S_ISREG(buf.st_mode)
 497             || ((buf.st_uid != real_uid) && ! (real_uid == 0))
 498             || !(S_IXUSR & buf.st_mode || atverify))
 499             continue;
 500
 501         if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
 502             continue;
 503
 504         /* If jobs are given, only list those jobs */
 505         if (joblist && !in_job_list(jobno, joblist, len))
 506             continue;
 507
 508         if (atqueue && (queue != atqueue))
 509             continue;
 510
 511         /* Get datetime */
 512         runtimer = 60*(time_t) ctm;
 513         timestr = timer2str(runtimer);
 514
 515         /* Look up owner's uid in password database file */
 516         pw = getpwuid(buf.st_uid);
 517
 518         if (first) {
 519                 printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
 520                 first=0;
 521         }
 522         printf("%s\t%-16s%c%s\t%ld\n",
 523                timestr,
 524                pw ? pw->pw_name : "???",
 525                queue,
 526                (S_IXUSR & buf.st_mode) ? "":"(done)",
 527                jobno);
 528         free(timestr);
 529     }
 530     closedir(spool);
 531
 532     PRIV_END
 533 }
 534
 535 static void
 536 process_jobs(int argc, char **argv, int what)
 537 {
 538     /* Delete every argument (job - ID) given
 539      */
 540     int i;
 541     struct stat buf;
 542     DIR *spool;
 543     struct dirent *dirent;
 544     unsigned long ctm;
 545     char queue;
 546     long jobno;
 547
 548     PRIV_START
 549
 550     if (chdir(ATJOB_DIR) != 0)
 551         perr("cannot change to " ATJOB_DIR);
 552
 553     if ((spool = opendir(".")) == NULL)
 554         perr("cannot open " ATJOB_DIR);
 555
 556     PRIV_END
 557
 558     /*  Loop over every file in the directory
 559      */
 560     while((dirent = readdir(spool)) != NULL) {
 561
 562         PRIV_START
 563         if (stat(dirent->d_name, &buf) != 0)
 564             perr("cannot stat in " ATJOB_DIR);
 565         PRIV_END
 566
 567         if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
 568             continue;
 569
 570         for (i=optind; i < argc; i++) {
 571             if (atoi(argv[i]) == jobno) {
 572                 if ((buf.st_uid != real_uid) && !(real_uid == 0))
 573                     errx(EXIT_FAILURE, "%s: not owner", argv[i]);
 574                 switch (what) {
 575                   case ATRM:
 576
 577                     PRIV_START
 578
 579                     if (unlink(dirent->d_name) != 0)
 580                         perr(dirent->d_name);
 581
 582                     PRIV_END
 583
 584                     break;
 585
 586                   case CAT:
 587                     {
 588                         FILE *fp;
 589                         int ch;
 590
 591                         PRIV_START
 592
 593                         fp = fopen(dirent->d_name,"r");
 594
 595                         PRIV_END
 596
 597                         if (!fp) {
 598                             perr("cannot open file");
 599                         }
 600                         while((ch = getc(fp)) != EOF) {
 601                             putchar(ch);
 602                         }
 603                         fclose(fp);
 604                     }
 605                     break;
 606
 607                   default:
 608                     errx(EXIT_FAILURE, "internal error, process_jobs = %d",
 609                         what);
 610                 }
 611             }
 612         }
 613     }
 614     closedir(spool);
 615 } /* delete_jobs */
 616
 617 #define ATOI2(ar)       ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
 618
 619 static time_t
 620 ttime(const char *arg)
 621 {
 622     /*
 623      * This is pretty much a copy of stime_arg1() from touch.c.  I changed
 624      * the return value and the argument list because it's more convenient
 625      * (IMO) to do everything in one place. - Joe Halpin
 626      */
 627     struct timeval tv[2];
 628     time_t now;
 629     struct tm *t;
 630     int yearset;
 631     char *p;
 632
 633     if (gettimeofday(&tv[0], NULL))
 634         panic("Cannot get current time");
 635
 636     /* Start with the current time. */
 637     now = tv[0].tv_sec;
 638     if ((t = localtime(&now)) == NULL)
 639         panic("localtime");
 640     /* [[CC]YY]MMDDhhmm[.SS] */
 641     if ((p = strchr(arg, '.')) == NULL)
 642         t->tm_sec = 0;          /* Seconds defaults to 0. */
 643     else {
 644         if (strlen(p + 1) != 2)
 645             goto terr;
 646         *p++ = '\0';
 647         t->tm_sec = ATOI2(p);
 648     }
 649
 650     yearset = 0;
 651     switch(strlen(arg)) {
 652     case 12:                    /* CCYYMMDDhhmm */
 653         t->tm_year = ATOI2(arg);
 654         t->tm_year *= 100;
 655         yearset = 1;
 656         /* FALLTHROUGH */
 657     case 10:                    /* YYMMDDhhmm */
 658         if (yearset) {
 659             yearset = ATOI2(arg);
 660             t->tm_year += yearset;
 661         } else {
 662             yearset = ATOI2(arg);
 663             t->tm_year = yearset + 2000;
 664         }
 665         t->tm_year -= 1900;     /* Convert to UNIX time. */
 666         /* FALLTHROUGH */
 667     case 8:                             /* MMDDhhmm */
 668         t->tm_mon = ATOI2(arg);
 669         --t->tm_mon;            /* Convert from 01-12 to 00-11 */
 670         t->tm_mday = ATOI2(arg);
 671         t->tm_hour = ATOI2(arg);
 672         t->tm_min = ATOI2(arg);
 673         break;
 674     default:
 675         goto terr;
 676     }
 677
 678     t->tm_isdst = -1;           /* Figure out DST. */
 679     tv[0].tv_sec = tv[1].tv_sec = mktime(t);
 680     if (tv[0].tv_sec != -1)
 681         return tv[0].tv_sec;
 682     else
 683 terr:
 684         panic(
 685            "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
 686 }
 687
 688 /* The caller must free up the memory. */
 689 static char *
 690 timer2str(time_t runtimer)
 691 {
 692         struct tm runtime;
 693         char *timestr;
 694         size_t rv;
 695
 696         timestr = malloc(TIMESIZE);
 697         if (timestr == NULL)
 698                 panic("out of memory");
 699
 700         runtime = *localtime(&runtimer);
 701         rv = strftime(timestr, TIMESIZE, nl_langinfo(D_T_FMT), &runtime);
 702         if (rv == 0)
 703                 panic("TIMESIZE too low");
 704
 705         return (timestr);
 706 }
 707
 708 static long *
 709 get_job_list(int argc, char *argv[], int *joblen)
 710 {
 711     int i, len;
 712     long *joblist;
 713     char *ep;
 714
 715     joblist = NULL;
 716     len = argc;
 717     if (len > 0) {
 718         if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
 719             panic("out of memory");
 720
 721         for (i = 0; i < argc; i++) {
 722             errno = 0;
 723             if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
 724                 ep == argv[i] || *ep != '\0' || errno)
 725                 panic("invalid job number");
 726         }
 727     }
 728
 729     *joblen = len;
 730     return joblist;
 731 }
 732
 733 int
 734 main(int argc, char **argv)
 735 {
 736     int c;
 737     char queue = DEFAULT_AT_QUEUE;
 738     char queue_set = 0;
 739     char *pgm;
 740
 741     int program = AT;                   /* our default program */
 742     const char *options = "q:f:t:rmvldbc"; /* default options for at */
 743     time_t timer;
 744     long *joblist;
 745     int joblen;
 746
 747     joblist = NULL;
 748     joblen = 0;
 749     timer = -1;
 750     RELINQUISH_PRIVS
 751
 752     /* Eat any leading paths
 753      */
 754     if ((pgm = strrchr(argv[0], '/')) == NULL)
 755         pgm = argv[0];
 756     else
 757         pgm++;
 758
 759     namep = pgm;
 760
 761     /* find out what this program is supposed to do
 762      */
 763     if (strcmp(pgm, "atq") == 0) {
 764         program = ATQ;
 765         options = "q:v";
 766     }
 767     else if (strcmp(pgm, "atrm") == 0) {
 768         program = ATRM;
 769         options = "";
 770     }
 771     else if (strcmp(pgm, "batch") == 0) {
 772         program = BATCH;
 773         options = "f:q:mv";
 774     }
 775
 776     /* process whatever options we can process
 777      */
 778     opterr=1;
 779     while ((c=getopt(argc, argv, options)) != -1)
 780         switch (c) {
 781         case 'v':   /* verify time settings */
 782             atverify = 1;
 783             break;
 784
 785         case 'm':   /* send mail when job is complete */
 786             send_mail = 1;
 787             break;
 788
 789         case 'f':
 790             atinput = optarg;
 791             break;
 792
 793         case 'q':    /* specify queue */
 794             if (strlen(optarg) > 1)
 795                 usage();
 796
 797             atqueue = queue = *optarg;
 798             if (!(islower(queue)||isupper(queue)))
 799                 usage();
 800
 801             queue_set = 1;
 802             break;
 803
 804         case 'd':
 805             warnx("-d is deprecated; use -r instead");
 806             /* FALLTHROUGH */
 807
 808         case 'r':
 809             if (program != AT)
 810                 usage();
 811
 812             program = ATRM;
 813             options = "";
 814             break;
 815
 816         case 't':
 817             if (program != AT)
 818                 usage();
 819             timer = ttime(optarg);
 820             break;
 821
 822         case 'l':
 823             if (program != AT)
 824                 usage();
 825
 826             program = ATQ;
 827             options = "q:";
 828             break;
 829
 830         case 'b':
 831             if (program != AT)
 832                 usage();
 833
 834             program = BATCH;
 835             options = "f:q:mv";
 836             break;
 837
 838         case 'c':
 839             program = CAT;
 840             options = "";
 841             break;
 842
 843         default:
 844             usage();
 845             break;
 846         }
 847     /* end of options eating
 848      */
 849
 850     /* select our program
 851      */
 852     if(!check_permission())
 853         errx(EXIT_FAILURE, "you do not have permission to use this program");
 854     switch (program) {
 855     case ATQ:
 856
 857         REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 858
 859         if (queue_set == 0)
 860             joblist = get_job_list(argc - optind, argv + optind, &joblen);
 861         list_jobs(joblist, joblen);
 862         break;
 863
 864     case ATRM:
 865
 866         REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 867
 868         process_jobs(argc, argv, ATRM);
 869         break;
 870
 871     case CAT:
 872
 873         process_jobs(argc, argv, CAT);
 874         break;
 875
 876     case AT:
 877         /*
 878          * If timer is > -1, then the user gave the time with -t.  In that
 879          * case, it's already been set. If not, set it now.
 880          */
 881         if (timer == -1)
 882             timer = parsetime(argc, argv);
 883
 884         if (atverify)
 885         {
 886             struct tm *tm = localtime(&timer);
 887             fprintf(stderr, "%s\n", asctime(tm));
 888         }
 889         writefile(timer, queue);
 890         break;
 891
 892     case BATCH:
 893         if (queue_set)
 894             queue = toupper(queue);
 895         else
 896             queue = DEFAULT_BATCH_QUEUE;
 897
 898         if (argc > optind)
 899             timer = parsetime(argc, argv);
 900         else
 901             timer = time(NULL);
 902
 903         if (atverify)
 904         {
 905             struct tm *tm = localtime(&timer);
 906             fprintf(stderr, "%s\n", asctime(tm));
 907         }
 908
 909         writefile(timer, queue);
 910         break;
 911
 912     default:
 913         panic("internal error");
 914         break;
 915     }
 916     exit(EXIT_SUCCESS);
 917 }