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  * $DragonFly: src/usr.bin/at/at.c,v 1.9 2007/09/22 20:22:51 pavalos Exp $
  30  */
  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 #include <langinfo.h>
  46 #include <locale.h>
  47 #include <pwd.h>
  48 #include <signal.h>
  49 #include <stddef.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <time.h>
  54 #include <unistd.h>
  55
  56 /* Local headers */
  57
  58 #include "at.h"
  59 #include "panic.h"
  60 #include "parsetime.h"
  61 #include "perm.h"
  62
  63 #define MAIN
  64 #include "privs.h"
  65
  66 /* Macros */
  67
  68 #ifndef ATJOB_DIR
  69 #define ATJOB_DIR "/usr/spool/atjobs/"
  70 #endif
  71
  72 #ifndef LFILE
  73 #define LFILE ATJOB_DIR ".lockfile"
  74 #endif
  75
  76 #ifndef ATJOB_MX
  77 #define ATJOB_MX 255
  78 #endif
  79
  80 #define ALARMC 10 /* Number of seconds to wait for timeout */
  81
  82 #define SIZE 255
  83 #define TIMESIZE 50
  84
  85 enum { ATQ, ATRM, AT, BATCH, CAT };     /* what program we want to run */
  86
  87 /* File scope variables */
  88
  89 const char *no_export[] =
  90 {
  91     "TERM", "TERMCAP", "DISPLAY", "_"
  92 } ;
  93 static int send_mail = 0;
  94
  95 /* External variables */
  96 uid_t real_uid, effective_uid;
  97 gid_t real_gid, effective_gid;
  98
  99 extern char **environ;
 100 int fcreated;
 101 char atfile[sizeof(ATJOB_DIR) + 14] = ATJOB_DIR;
 102
 103 char *atinput = NULL;           /* where to get input from */
 104 char atqueue = 0;               /* which queue to examine for jobs (atq) */
 105 char atverify = 0;              /* verify time instead of queuing job */
 106 char *namep;
 107
 108 /* Function declarations */
 109
 110 static void sigc(int signo);
 111 static void alarmc(int signo);
 112 static char *cwdname(void);
 113 static void writefile(time_t runtimer, char queue);
 114 static void list_jobs(long *, int);
 115 static long nextjob(void);
 116 static time_t ttime(const char *arg);
 117 static char * timer2str(time_t runtimer);
 118 static int in_job_list(long, long *, int);
 119 static long *get_job_list(int, char *[], int *);
 120
 121 /* Signal catching functions */
 122
 123 static void
 124 sigc(int signo __unused)
 125 {
 126 /* If the user presses ^C, remove the spool file and exit
 127  */
 128     if (fcreated)
 129     {
 130         PRIV_START
 131             unlink(atfile);
 132         PRIV_END
 133     }
 134
 135     _exit(EXIT_FAILURE);
 136 }
 137
 138 static void
 139 alarmc(int signo __unused)
 140 {
 141     char buf[1024];
 142
 143     /* Time out after some seconds. */
 144     strlcpy(buf, namep, sizeof(buf));
 145     strlcat(buf, ": file locking timed out\n", sizeof(buf));
 146     write(STDERR_FILENO, buf, strlen(buf));
 147     sigc(0);
 148 }
 149
 150 /* Local functions */
 151
 152 static char *
 153 cwdname(void)
 154 {
 155 /* Read in the current directory; the name will be overwritten on
 156  * subsequent calls.
 157  */
 158     static char *ptr = NULL;
 159     static size_t size = SIZE;
 160
 161     if (ptr == NULL)
 162         if ((ptr = malloc(size)) == NULL)
 163             errx(EXIT_FAILURE, "virtual memory exhausted");
 164
 165     while (1)
 166     {
 167         if (ptr == NULL)
 168             panic("out of memory");
 169
 170         if (getcwd(ptr, size-1) != NULL)
 171             return ptr;
 172
 173         if (errno != ERANGE)
 174             perr("cannot get directory");
 175
 176         free (ptr);
 177         size += SIZE;
 178         if ((ptr = malloc(size)) == NULL)
 179             errx(EXIT_FAILURE, "virtual memory exhausted");
 180     }
 181 }
 182
 183 static long
 184 nextjob(void)
 185 {
 186     long jobno;
 187     FILE *fid;
 188
 189     if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
 190         if (fscanf(fid, "%5lx", &jobno) == 1) {
 191             rewind(fid);
 192             jobno = (1+jobno) % 0xfffff;        /* 2^20 jobs enough? */
 193             fprintf(fid, "%05lx\n", jobno);
 194         }
 195         else
 196             jobno = EOF;
 197         fclose(fid);
 198         return jobno;
 199     }
 200     else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
 201         fprintf(fid, "%05lx\n", jobno = 1);
 202         fclose(fid);
 203         return 1;
 204     }
 205     return EOF;
 206 }
 207
 208 static void
 209 writefile(time_t runtimer, char queue)
 210 {
 211 /* This does most of the work if at or batch are invoked for writing a job.
 212  */
 213     long jobno;
 214     char *ap, *ppos, *mailname;
 215     struct passwd *pass_entry;
 216     struct stat statbuf;
 217     int fdes, lockdes, fd2;
 218     FILE *fp, *fpin;
 219     struct sigaction act;
 220     char **atenv;
 221     int ch;
 222     mode_t cmask;
 223     struct flock lock;
 224
 225     setlocale(LC_TIME, "");
 226
 227 /* Install the signal handler for SIGINT; terminate after removing the
 228  * spool file if necessary
 229  */
 230     act.sa_handler = sigc;
 231     sigemptyset(&(act.sa_mask));
 232     act.sa_flags = 0;
 233
 234     sigaction(SIGINT, &act, NULL);
 235
 236     /* Loop over all possible file names for running something at this
 237      * particular time, see if a file is there; the first empty slot at any
 238      * particular time is used.  Lock the file LFILE first to make sure
 239      * we're alone when doing this.
 240      */
 241
 242     PRIV_START
 243
 244     if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
 245         perr("cannot open lockfile " LFILE);
 246
 247     lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
 248     lock.l_len = 0;
 249
 250     act.sa_handler = alarmc;
 251     sigemptyset(&(act.sa_mask));
 252     act.sa_flags = 0;
 253
 254     /* Set an alarm so a timeout occurs after ALARMC seconds, in case
 255      * something is seriously broken.
 256      */
 257     sigaction(SIGALRM, &act, NULL);
 258     alarm(ALARMC);
 259     fcntl(lockdes, F_SETLKW, &lock);
 260     alarm(0);
 261
 262     if ((jobno = nextjob()) == EOF)
 263         perr("cannot generate job number");
 264
 265     ppos = atfile + strlen(atfile);
 266     snprintf(ppos, sizeof(atfile) - strlen(atfile), "%c%5lx%8lx", queue,
 267              jobno, (unsigned long) (runtimer/60));
 268
 269     for(ap=ppos; *ap != '\0'; ap ++)
 270         if (*ap == ' ')
 271             *ap = '0';
 272
 273     if (stat(atfile, &statbuf) != 0)
 274         if (errno != ENOENT)
 275             perr("cannot access " ATJOB_DIR);
 276
 277     /* Create the file. The x bit is only going to be set after it has
 278      * been completely written out, to make sure it is not executed in the
 279      * meantime.  To make sure they do not get deleted, turn off their r
 280      * bit.  Yes, this is a kluge.
 281      */
 282     cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
 283     if ((fdes = creat(atfile, O_WRONLY)) == -1)
 284         perr("cannot create atjob file");
 285
 286     if ((fd2 = dup(fdes)) <0)
 287         perr("error in dup() of job file");
 288
 289     if(fchown(fd2, real_uid, real_gid) != 0)
 290         perr("cannot give away file");
 291
 292     PRIV_END
 293
 294     /* We no longer need suid root; now we just need to be able to write
 295      * to the directory, if necessary.
 296      */
 297
 298     REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 299
 300     /* We've successfully created the file; let's set the flag so it
 301      * gets removed in case of an interrupt or error.
 302      */
 303     fcreated = 1;
 304
 305     /* Now we can release the lock, so other people can access it
 306      */
 307     lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
 308     lock.l_len = 0;
 309     fcntl(lockdes, F_SETLKW, &lock);
 310     close(lockdes);
 311
 312     if((fp = fdopen(fdes, "w")) == NULL)
 313         panic("cannot reopen atjob file");
 314
 315     /* Get the userid to mail to, first by trying getlogin(),
 316      * then from LOGNAME, finally from getpwuid().
 317      */
 318     mailname = getlogin();
 319     if (mailname == NULL)
 320         mailname = getenv("LOGNAME");
 321
 322     if ((mailname == NULL) || (mailname[0] == '\0')
 323         || (strlen(mailname) >= MAXLOGNAME) || (getpwnam(mailname)==NULL))
 324     {
 325         pass_entry = getpwuid(real_uid);
 326         if (pass_entry != NULL)
 327             mailname = pass_entry->pw_name;
 328     }
 329
 330     if (atinput != NULL)
 331     {
 332         fpin = freopen(atinput, "r", stdin);
 333         if (fpin == NULL)
 334             perr("cannot open input file");
 335     }
 336     fprintf(fp, "#!/bin/sh\n# atrun uid=%ld gid=%ld\n# mail %*s %d\n",
 337         (long) real_uid, (long) real_gid, MAXLOGNAME - 1, mailname,
 338         send_mail);
 339
 340     /* Write out the umask at the time of invocation
 341      */
 342     fprintf(fp, "umask %lo\n", (unsigned long) cmask);
 343
 344     /* Write out the environment. Anything that may look like a
 345      * special character to the shell is quoted, except for \n, which is
 346      * done with a pair of "'s.  Don't export the no_export list (such
 347      * as TERM or DISPLAY) because we don't want these.
 348      */
 349     for (atenv= environ; *atenv != NULL; atenv++)
 350     {
 351         int export = 1;
 352         char *eqp;
 353
 354         eqp = strchr(*atenv, '=');
 355         if (ap == NULL)
 356             eqp = *atenv;
 357         else
 358         {
 359             size_t i;
 360             for (i=0; i<sizeof(no_export)/sizeof(no_export[0]); i++)
 361             {
 362                 export = export
 363                     && (strncmp(*atenv, no_export[i],
 364                                 (size_t) (eqp-*atenv)) != 0);
 365             }
 366             eqp++;
 367         }
 368
 369         if (export)
 370         {
 371             fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
 372             for(ap = eqp;*ap != '\0'; ap++)
 373             {
 374                 if (*ap == '\n')
 375                     fprintf(fp, "\"\n\"");
 376                 else
 377                 {
 378                     if (!isalnum(*ap)) {
 379                         switch (*ap) {
 380                           case '%': case '/': case '{': case '[':
 381                           case ']': case '=': case '}': case '@':
 382                           case '+': case '#': case ',': case '.':
 383                           case ':': case '-': case '_':
 384                             break;
 385                           default:
 386                             fputc('\\', fp);
 387                             break;
 388                         }
 389                     }
 390                     fputc(*ap, fp);
 391                 }
 392             }
 393             fputs("; export ", fp);
 394             fwrite(*atenv, sizeof(char), eqp-*atenv -1, fp);
 395             fputc('\n', fp);
 396
 397         }
 398     }
 399     /* Cd to the directory at the time and write out all the
 400      * commands the user supplies from stdin.
 401      */
 402     fprintf(fp, "cd ");
 403     for (ap = cwdname(); *ap != '\0'; ap++)
 404     {
 405         if (*ap == '\n')
 406             fprintf(fp, "\"\n\"");
 407         else
 408         {
 409             if (*ap != '/' && !isalnum(*ap))
 410                 fputc('\\', fp);
 411
 412             fputc(*ap, fp);
 413         }
 414     }
 415     /* Test cd's exit status: die if the original directory has been
 416      * removed, become unreadable or whatever
 417      */
 418     fprintf(fp, " || {\n\t echo 'Execution directory "
 419                 "inaccessible' >&2\n\t exit 1\n}\n");
 420
 421     while((ch = getchar()) != EOF)
 422         fputc(ch, fp);
 423
 424     fprintf(fp, "\n");
 425     if (ferror(fp))
 426         panic("output error");
 427
 428     if (ferror(stdin))
 429         panic("input error");
 430
 431     fclose(fp);
 432
 433     /* Set the x bit so that we're ready to start executing
 434      */
 435
 436     if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
 437         perr("cannot give away file");
 438
 439     close(fd2);
 440
 441     /* Print output. */
 442     char *timestr = timer2str(runtimer);
 443
 444     fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
 445     fprintf(stderr, "Job %ld at %s\n", jobno, timestr);
 446     free(timestr);
 447 }
 448
 449 static int
 450 in_job_list(long job, long *joblist, int len)
 451 {
 452     int i;
 453
 454     for (i = 0; i < len; i++)
 455         if (job == joblist[i])
 456             return 1;
 457
 458     return 0;
 459 }
 460
 461 static void
 462 list_jobs(long *joblist, int len)
 463 {
 464     /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
 465      * or everybody's if we are root
 466      */
 467     struct passwd *pw;
 468     DIR *spool;
 469     struct dirent *dirent;
 470     struct stat buf;
 471     unsigned long ctm;
 472     char queue;
 473     long jobno;
 474     time_t runtimer;
 475     char *timestr;
 476     int first=1;
 477
 478     setlocale(LC_TIME, "");
 479
 480     PRIV_START
 481
 482     if (chdir(ATJOB_DIR) != 0)
 483         perr("cannot change to " ATJOB_DIR);
 484
 485     if ((spool = opendir(".")) == NULL)
 486         perr("cannot open " ATJOB_DIR);
 487
 488     /*  Loop over every file in the directory
 489      */
 490     while((dirent = readdir(spool)) != NULL) {
 491         if (stat(dirent->d_name, &buf) != 0)
 492             perr("cannot stat in " ATJOB_DIR);
 493
 494         /* See it's a regular file and has its x bit turned on and
 495          * is the user's
 496          */
 497         if (!S_ISREG(buf.st_mode)
 498             || ((buf.st_uid != real_uid) && ! (real_uid == 0))
 499             || !(S_IXUSR & buf.st_mode || atverify))
 500             continue;
 501
 502         if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
 503             continue;
 504
 505         /* If jobs are given, only list those jobs */
 506         if (joblist && !in_job_list(jobno, joblist, len))
 507             continue;
 508
 509         if (atqueue && (queue != atqueue))
 510             continue;
 511
 512         /* Get datetime */
 513         runtimer = 60*(time_t) ctm;
 514         timestr = timer2str(runtimer);
 515
 516         /* Look up owner's uid in password database file */
 517         pw = getpwuid(buf.st_uid);
 518
 519         if (first) {
 520                 printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
 521                 first=0;
 522         }
 523         printf("%s\t%-16s%c%s\t%ld\n",
 524                timestr,
 525                pw ? pw->pw_name : "???",
 526                queue,
 527                (S_IXUSR & buf.st_mode) ? "":"(done)",
 528                jobno);
 529         free(timestr);
 530     }
 531     closedir(spool);
 532
 533     PRIV_END
 534 }
 535
 536 static void
 537 process_jobs(int argc, char **argv, int what)
 538 {
 539     /* Delete every argument (job - ID) given
 540      */
 541     int i;
 542     struct stat buf;
 543     DIR *spool;
 544     struct dirent *dirent;
 545     unsigned long ctm;
 546     char queue;
 547     long jobno;
 548
 549     PRIV_START
 550
 551     if (chdir(ATJOB_DIR) != 0)
 552         perr("cannot change to " ATJOB_DIR);
 553
 554     if ((spool = opendir(".")) == NULL)
 555         perr("cannot open " ATJOB_DIR);
 556
 557     PRIV_END
 558
 559     /*  Loop over every file in the directory
 560      */
 561     while((dirent = readdir(spool)) != NULL) {
 562
 563         PRIV_START
 564         if (stat(dirent->d_name, &buf) != 0)
 565             perr("cannot stat in " ATJOB_DIR);
 566         PRIV_END
 567
 568         if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
 569             continue;
 570
 571         for (i=optind; i < argc; i++) {
 572             if (atoi(argv[i]) == jobno) {
 573                 if ((buf.st_uid != real_uid) && !(real_uid == 0))
 574                     errx(EXIT_FAILURE, "%s: not owner", argv[i]);
 575                 switch (what) {
 576                   case ATRM:
 577
 578                     PRIV_START
 579
 580                     if (unlink(dirent->d_name) != 0)
 581                         perr(dirent->d_name);
 582
 583                     PRIV_END
 584
 585                     break;
 586
 587                   case CAT:
 588                     {
 589                         FILE *fp;
 590                         int ch;
 591
 592                         PRIV_START
 593
 594                         fp = fopen(dirent->d_name,"r");
 595
 596                         PRIV_END
 597
 598                         if (!fp) {
 599                             perr("cannot open file");
 600                         }
 601                         while((ch = getc(fp)) != EOF) {
 602                             putchar(ch);
 603                         }
 604                         fclose(fp);
 605                     }
 606                     break;
 607
 608                   default:
 609                     errx(EXIT_FAILURE, "internal error, process_jobs = %d",
 610                         what);
 611                 }
 612             }
 613         }
 614     }
 615     closedir(spool);
 616 } /* delete_jobs */
 617
 618 #define ATOI2(ar)       ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
 619
 620 static time_t
 621 ttime(const char *arg)
 622 {
 623     /*
 624      * This is pretty much a copy of stime_arg1() from touch.c.  I changed
 625      * the return value and the argument list because it's more convenient
 626      * (IMO) to do everything in one place. - Joe Halpin
 627      */
 628     struct timeval tv[2];
 629     time_t now;
 630     struct tm *t;
 631     int yearset;
 632     char *p;
 633
 634     if (gettimeofday(&tv[0], NULL))
 635         panic("Cannot get current time");
 636
 637     /* Start with the current time. */
 638     now = tv[0].tv_sec;
 639     if ((t = localtime(&now)) == NULL)
 640         panic("localtime");
 641     /* [[CC]YY]MMDDhhmm[.SS] */
 642     if ((p = strchr(arg, '.')) == NULL)
 643         t->tm_sec = 0;          /* Seconds defaults to 0. */
 644     else {
 645         if (strlen(p + 1) != 2)
 646             goto terr;
 647         *p++ = '\0';
 648         t->tm_sec = ATOI2(p);
 649     }
 650
 651     yearset = 0;
 652     switch(strlen(arg)) {
 653     case 12:                    /* CCYYMMDDhhmm */
 654         t->tm_year = ATOI2(arg);
 655         t->tm_year *= 100;
 656         yearset = 1;
 657         /* FALLTHROUGH */
 658     case 10:                    /* YYMMDDhhmm */
 659         if (yearset) {
 660             yearset = ATOI2(arg);
 661             t->tm_year += yearset;
 662         } else {
 663             yearset = ATOI2(arg);
 664             t->tm_year = yearset + 2000;
 665         }
 666         t->tm_year -= 1900;     /* Convert to UNIX time. */
 667         /* FALLTHROUGH */
 668     case 8:                             /* MMDDhhmm */
 669         t->tm_mon = ATOI2(arg);
 670         --t->tm_mon;            /* Convert from 01-12 to 00-11 */
 671         t->tm_mday = ATOI2(arg);
 672         t->tm_hour = ATOI2(arg);
 673         t->tm_min = ATOI2(arg);
 674         break;
 675     default:
 676         goto terr;
 677     }
 678
 679     t->tm_isdst = -1;           /* Figure out DST. */
 680     tv[0].tv_sec = tv[1].tv_sec = mktime(t);
 681     if (tv[0].tv_sec != -1)
 682         return tv[0].tv_sec;
 683     else
 684 terr:
 685         panic(
 686            "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
 687 }
 688
 689 /* The caller must free up the memory. */
 690 static char *
 691 timer2str(time_t runtimer)
 692 {
 693         struct tm runtime;
 694         char *timestr;
 695         size_t rv;
 696
 697         timestr = malloc(TIMESIZE);
 698         if (timestr == NULL)
 699                 panic("out of memory");
 700
 701         runtime = *localtime(&runtimer);
 702         rv = strftime(timestr, TIMESIZE, nl_langinfo(D_T_FMT), &runtime);
 703         if (rv == 0)
 704                 panic("TIMESIZE too low");
 705
 706         return (timestr);
 707 }
 708
 709 static long *
 710 get_job_list(int argc, char *argv[], int *joblen)
 711 {
 712     int i, len;
 713     long *joblist;
 714     char *ep;
 715
 716     joblist = NULL;
 717     len = argc;
 718     if (len > 0) {
 719         if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
 720             panic("out of memory");
 721
 722         for (i = 0; i < argc; i++) {
 723             errno = 0;
 724             if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
 725                 ep == argv[i] || *ep != '\0' || errno)
 726                 panic("invalid job number");
 727         }
 728     }
 729
 730     *joblen = len;
 731     return joblist;
 732 }
 733
 734 int
 735 main(int argc, char **argv)
 736 {
 737     int c;
 738     char queue = DEFAULT_AT_QUEUE;
 739     char queue_set = 0;
 740     char *pgm;
 741
 742     int program = AT;                   /* our default program */
 743     const char *options = "q:f:t:rmvldbc"; /* default options for at */
 744     time_t timer;
 745     long *joblist;
 746     int joblen;
 747
 748     joblist = NULL;
 749     joblen = 0;
 750     timer = -1;
 751     RELINQUISH_PRIVS
 752
 753     /* Eat any leading paths
 754      */
 755     if ((pgm = strrchr(argv[0], '/')) == NULL)
 756         pgm = argv[0];
 757     else
 758         pgm++;
 759
 760     namep = pgm;
 761
 762     /* find out what this program is supposed to do
 763      */
 764     if (strcmp(pgm, "atq") == 0) {
 765         program = ATQ;
 766         options = "q:v";
 767     }
 768     else if (strcmp(pgm, "atrm") == 0) {
 769         program = ATRM;
 770         options = "";
 771     }
 772     else if (strcmp(pgm, "batch") == 0) {
 773         program = BATCH;
 774         options = "f:q:mv";
 775     }
 776
 777     /* process whatever options we can process
 778      */
 779     opterr=1;
 780     while ((c=getopt(argc, argv, options)) != -1)
 781         switch (c) {
 782         case 'v':   /* verify time settings */
 783             atverify = 1;
 784             break;
 785
 786         case 'm':   /* send mail when job is complete */
 787             send_mail = 1;
 788             break;
 789
 790         case 'f':
 791             atinput = optarg;
 792             break;
 793
 794         case 'q':    /* specify queue */
 795             if (strlen(optarg) > 1)
 796                 usage();
 797
 798             atqueue = queue = *optarg;
 799             if (!(islower(queue)||isupper(queue)))
 800                 usage();
 801
 802             queue_set = 1;
 803             break;
 804
 805         case 'd':
 806             warnx("-d is deprecated; use -r instead");
 807             /* fall through to 'r' */
 808
 809         case 'r':
 810             if (program != AT)
 811                 usage();
 812
 813             program = ATRM;
 814             options = "";
 815             break;
 816
 817         case 't':
 818             if (program != AT)
 819                 usage();
 820             timer = ttime(optarg);
 821             break;
 822
 823         case 'l':
 824             if (program != AT)
 825                 usage();
 826
 827             program = ATQ;
 828             options = "q:";
 829             break;
 830
 831         case 'b':
 832             if (program != AT)
 833                 usage();
 834
 835             program = BATCH;
 836             options = "f:q:mv";
 837             break;
 838
 839         case 'c':
 840             program = CAT;
 841             options = "";
 842             break;
 843
 844         default:
 845             usage();
 846             break;
 847         }
 848     /* end of options eating
 849      */
 850
 851     /* select our program
 852      */
 853     if(!check_permission())
 854         errx(EXIT_FAILURE, "you do not have permission to use this program");
 855     switch (program) {
 856     case ATQ:
 857
 858         REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 859
 860         if (queue_set == 0)
 861             joblist = get_job_list(argc - optind, argv + optind, &joblen);
 862         list_jobs(joblist, joblen);
 863         break;
 864
 865     case ATRM:
 866
 867         REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
 868
 869         process_jobs(argc, argv, ATRM);
 870         break;
 871
 872     case CAT:
 873
 874         process_jobs(argc, argv, CAT);
 875         break;
 876
 877     case AT:
 878         /*
 879          * If timer is > -1, then the user gave the time with -t.  In that
 880          * case, it's already been set. If not, set it now.
 881          */
 882         if (timer == -1)
 883             timer = parsetime(argc, argv);
 884
 885         if (atverify)
 886         {
 887             struct tm *tm = localtime(&timer);
 888             fprintf(stderr, "%s\n", asctime(tm));
 889         }
 890         writefile(timer, queue);
 891         break;
 892
 893     case BATCH:
 894         if (queue_set)
 895             queue = toupper(queue);
 896         else
 897             queue = DEFAULT_BATCH_QUEUE;
 898
 899         if (argc > optind)
 900             timer = parsetime(argc, argv);
 901         else
 902             timer = time(NULL);
 903
 904         if (atverify)
 905         {
 906             struct tm *tm = localtime(&timer);
 907             fprintf(stderr, "%s\n", asctime(tm));
 908         }
 909
 910         writefile(timer, queue);
 911         break;
 912
 913     default:
 914         panic("internal error");
 915         break;
 916     }
 917     exit(EXIT_SUCCESS);
 918 }