1/*-
2 *  at.c : Put file into atrun queue
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 *  Copyright (C) 1993, 1994 Thomas Koenig
7 *
8 *  Atrun & Atq modifications
9 *  Copyright (C) 1993  David Parsons
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. The name of the author(s) may not be used to endorse or promote
17 *    products derived from this software without specific prior written
18 *    permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#define _USE_BSD 1
34
35/* System Headers */
36
37#include <sys/param.h>
38#include <sys/stat.h>
39#include <sys/time.h>
40#include <sys/wait.h>
41#include <ctype.h>
42#include <dirent.h>
43#include <err.h>
44#include <errno.h>
45#include <fcntl.h>
46#ifndef __FreeBSD__
47#include <getopt.h>
48#endif
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/* Local headers */
62
63#include "at.h"
64#include "panic.h"
65#include "parsetime.h"
66#include "perm.h"
67
68#define MAIN
69#include "privs.h"
70
71/* Macros */
72
73#ifndef ATJOB_DIR
74#define ATJOB_DIR "/usr/spool/atjobs/"
75#endif
76
77#ifndef LFILE
78#define LFILE ATJOB_DIR ".lockfile"
79#endif
80
81#ifndef ATJOB_MX
82#define ATJOB_MX 255
83#endif
84
85#define ALARMC 10 /* Number of seconds to wait for timeout */
86
87#define SIZE 255
88#define TIMESIZE 50
89
90enum { ATQ, ATRM, AT, BATCH, CAT };	/* what program we want to run */
91
92/* File scope variables */
93
94static const char *no_export[] = {
95    "TERM", "TERMCAP", "DISPLAY", "_"
96};
97static int send_mail = 0;
98static char *atinput = NULL;	/* where to get input from */
99static char atqueue = 0;	/* which queue to examine for jobs (atq) */
100
101/* External variables */
102
103extern char **environ;
104int fcreated;
105char atfile[] = ATJOB_DIR "12345678901234";
106char atverify = 0;		/* verify time instead of queuing job */
107char *namep;
108
109/* Function declarations */
110
111static void sigc(int signo);
112static void alarmc(int signo);
113static char *cwdname(void);
114static void writefile(time_t runtimer, char queue);
115static void list_jobs(long *, int);
116static long nextjob(void);
117static time_t ttime(const char *arg);
118static int in_job_list(long, long *, int);
119static long *get_job_list(int, char *[], int *);
120
121/* Signal catching functions */
122
123static void 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
137static void alarmc(int signo __unused)
138{
139    char buf[1024];
140
141    /* Time out after some seconds. */
142    strlcpy(buf, namep, sizeof(buf));
143    strlcat(buf, ": file locking timed out\n", sizeof(buf));
144    write(STDERR_FILENO, buf, strlen(buf));
145    sigc(0);
146}
147
148/* Local functions */
149
150static char *cwdname(void)
151{
152/* Read in the current directory; the name will be overwritten on
153 * subsequent calls.
154 */
155    static char *ptr = NULL;
156    static size_t size = SIZE;
157
158    if (ptr == NULL)
159	if ((ptr = malloc(size)) == NULL)
160	    errx(EXIT_FAILURE, "virtual memory exhausted");
161
162    while (1)
163    {
164	if (ptr == NULL)
165	    panic("out of memory");
166
167	if (getcwd(ptr, size-1) != NULL)
168	    return ptr;
169
170	if (errno != ERANGE)
171	    perr("cannot get directory");
172
173	free (ptr);
174	size += SIZE;
175	if ((ptr = malloc(size)) == NULL)
176	    errx(EXIT_FAILURE, "virtual memory exhausted");
177    }
178}
179
180static long
181nextjob(void)
182{
183    long jobno;
184    FILE *fid;
185
186    if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
187	if (fscanf(fid, "%5lx", &jobno) == 1) {
188	    rewind(fid);
189	    jobno = (1+jobno) % 0xfffff;	/* 2^20 jobs enough? */
190	    fprintf(fid, "%05lx\n", jobno);
191	}
192	else
193	    jobno = EOF;
194	fclose(fid);
195	return jobno;
196    }
197    else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
198	fprintf(fid, "%05lx\n", jobno = 1);
199	fclose(fid);
200	return 1;
201    }
202    return EOF;
203}
204
205static void
206writefile(time_t runtimer, char queue)
207{
208/* This does most of the work if at or batch are invoked for writing a job.
209 */
210    long jobno;
211    char *ap, *ppos, *mailname;
212    struct passwd *pass_entry;
213    struct stat statbuf;
214    int fdes, lockdes, fd2;
215    FILE *fp, *fpin;
216    struct sigaction act;
217    char **atenv;
218    int ch;
219    mode_t cmask;
220    struct flock lock;
221
222#ifdef __FreeBSD__
223    (void) setlocale(LC_TIME, "");
224#endif
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    ppos = atfile + strlen(ATJOB_DIR);
236
237    /* Loop over all possible file names for running something at this
238     * particular time, see if a file is there; the first empty slot at any
239     * particular time is used.  Lock the file LFILE first to make sure
240     * we're alone when doing this.
241     */
242
243    PRIV_START
244
245    if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
246	perr("cannot open lockfile " LFILE);
247
248    lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
249    lock.l_len = 0;
250
251    act.sa_handler = alarmc;
252    sigemptyset(&(act.sa_mask));
253    act.sa_flags = 0;
254
255    /* Set an alarm so a timeout occurs after ALARMC seconds, in case
256     * something is seriously broken.
257     */
258    sigaction(SIGALRM, &act, NULL);
259    alarm(ALARMC);
260    fcntl(lockdes, F_SETLKW, &lock);
261    alarm(0);
262
263    if ((jobno = nextjob()) == EOF)
264	perr("cannot generate job number");
265
266    sprintf(ppos, "%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 != (char *) 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 (eqp == NULL)
356	    eqp = *atenv;
357	else
358	{
359	    size_t i;
360	    for (i = 0; i < nitems(no_export); 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	    (void)fputs("export ", fp);
372	    fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
373	    for(ap = eqp;*ap != '\0'; ap++)
374	    {
375		if (*ap == '\n')
376		    fprintf(fp, "\"\n\"");
377		else
378		{
379		    if (!isalnum(*ap)) {
380			switch (*ap) {
381			  case '%': case '/': case '{': case '[':
382			  case ']': case '=': case '}': case '@':
383			  case '+': case '#': case ',': case '.':
384			  case ':': case '-': case '_':
385			    break;
386			  default:
387			    fputc('\\', fp);
388			    break;
389			}
390		    }
391		    fputc(*ap, fp);
392		}
393	    }
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    fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
440}
441
442static int
443in_job_list(long job, long *joblist, int len)
444{
445    int i;
446
447    for (i = 0; i < len; i++)
448	if (job == joblist[i])
449	    return 1;
450
451    return 0;
452}
453
454static void
455list_jobs(long *joblist, int len)
456{
457    /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
458     * or everybody's if we are root
459     */
460    struct passwd *pw;
461    DIR *spool;
462    struct dirent *dirent;
463    struct stat buf;
464    struct tm runtime;
465    unsigned long ctm;
466    char queue;
467    long jobno;
468    time_t runtimer;
469    char timestr[TIMESIZE];
470    int first=1;
471
472#ifdef __FreeBSD__
473    (void) setlocale(LC_TIME, "");
474#endif
475
476    PRIV_START
477
478    if (chdir(ATJOB_DIR) != 0)
479	perr("cannot change to " ATJOB_DIR);
480
481    if ((spool = opendir(".")) == NULL)
482	perr("cannot open " ATJOB_DIR);
483
484    /*	Loop over every file in the directory
485     */
486    while((dirent = readdir(spool)) != NULL) {
487	if (stat(dirent->d_name, &buf) != 0)
488	    perr("cannot stat in " ATJOB_DIR);
489
490	/* See it's a regular file and has its x bit turned on and
491         * is the user's
492         */
493	if (!S_ISREG(buf.st_mode)
494	    || ((buf.st_uid != real_uid) && ! (real_uid == 0))
495	    || !(S_IXUSR & buf.st_mode || atverify))
496	    continue;
497
498	if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
499	    continue;
500
501	/* If jobs are given, only list those jobs */
502	if (joblist && !in_job_list(jobno, joblist, len))
503	    continue;
504
505	if (atqueue && (queue != atqueue))
506	    continue;
507
508	runtimer = 60*(time_t) ctm;
509	runtime = *localtime(&runtimer);
510	strftime(timestr, TIMESIZE, "%+", &runtime);
511	if (first) {
512	    printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
513	    first=0;
514	}
515	pw = getpwuid(buf.st_uid);
516
517	printf("%s\t%-16s%c%s\t%ld\n",
518	       timestr,
519	       pw ? pw->pw_name : "???",
520	       queue,
521	       (S_IXUSR & buf.st_mode) ? "":"(done)",
522	       jobno);
523    }
524    PRIV_END
525    closedir(spool);
526}
527
528static void
529process_jobs(int argc, char **argv, int what)
530{
531    /* Delete every argument (job - ID) given
532     */
533    int i;
534    int rc;
535    int nofJobs;
536    int nofDone;
537    int statErrno;
538    struct stat buf;
539    DIR *spool;
540    struct dirent *dirent;
541    unsigned long ctm;
542    char queue;
543    long jobno;
544
545    nofJobs = argc - optind;
546    nofDone = 0;
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	rc = stat(dirent->d_name, &buf);
564	statErrno = errno;
565	PRIV_END
566	/* There's a race condition between readdir above and stat here:
567	 * another atrm process could have removed the file from the spool
568	 * directory under our nose. If this happens, stat will set errno to
569	 * ENOENT, which we shouldn't treat as fatal.
570	 */
571	if (rc != 0) {
572	    if (statErrno == ENOENT)
573		continue;
574	    else
575		perr("cannot stat in " ATJOB_DIR);
576	}
577
578	if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
579	    continue;
580
581	for (i=optind; i < argc; i++) {
582	    if (atoi(argv[i]) == jobno) {
583		if ((buf.st_uid != real_uid) && !(real_uid == 0))
584		    errx(EXIT_FAILURE, "%s: not owner", argv[i]);
585		switch (what) {
586		  case ATRM:
587
588		    PRIV_START
589
590		    if (unlink(dirent->d_name) != 0)
591		        perr(dirent->d_name);
592
593		    PRIV_END
594
595		    break;
596
597		  case CAT:
598		    {
599			FILE *fp;
600			int ch;
601
602			PRIV_START
603
604			fp = fopen(dirent->d_name,"r");
605
606			PRIV_END
607
608			if (!fp) {
609			    perr("cannot open file");
610			}
611			while((ch = getc(fp)) != EOF) {
612			    putchar(ch);
613			}
614			fclose(fp);
615		    }
616		    break;
617
618		  default:
619		    errx(EXIT_FAILURE, "internal error, process_jobs = %d",
620			what);
621	        }
622
623		/* All arguments have been processed
624		 */
625		if (++nofDone == nofJobs)
626		    goto end;
627	    }
628	}
629    }
630end:
631    closedir(spool);
632} /* delete_jobs */
633
634#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
635
636static time_t
637ttime(const char *arg)
638{
639    /*
640     * This is pretty much a copy of stime_arg1() from touch.c.  I changed
641     * the return value and the argument list because it's more convenient
642     * (IMO) to do everything in one place. - Joe Halpin
643     */
644    struct timeval tv[2];
645    time_t now;
646    struct tm *t;
647    int yearset;
648    char *p;
649
650    if (gettimeofday(&tv[0], NULL))
651	panic("Cannot get current time");
652
653    /* Start with the current time. */
654    now = tv[0].tv_sec;
655    if ((t = localtime(&now)) == NULL)
656	panic("localtime");
657    /* [[CC]YY]MMDDhhmm[.SS] */
658    if ((p = strchr(arg, '.')) == NULL)
659	t->tm_sec = 0;		/* Seconds defaults to 0. */
660    else {
661	if (strlen(p + 1) != 2)
662	    goto terr;
663	*p++ = '\0';
664	t->tm_sec = ATOI2(p);
665    }
666
667    yearset = 0;
668    switch(strlen(arg)) {
669    case 12:			/* CCYYMMDDhhmm */
670	t->tm_year = ATOI2(arg);
671	t->tm_year *= 100;
672	yearset = 1;
673	/* FALLTHROUGH */
674    case 10:			/* YYMMDDhhmm */
675	if (yearset) {
676	    yearset = ATOI2(arg);
677	    t->tm_year += yearset;
678	} else {
679	    yearset = ATOI2(arg);
680	    t->tm_year = yearset + 2000;
681	}
682	t->tm_year -= 1900;	/* Convert to UNIX time. */
683	/* FALLTHROUGH */
684    case 8:				/* MMDDhhmm */
685	t->tm_mon = ATOI2(arg);
686	--t->tm_mon;		/* Convert from 01-12 to 00-11 */
687	t->tm_mday = ATOI2(arg);
688	t->tm_hour = ATOI2(arg);
689	t->tm_min = ATOI2(arg);
690	break;
691    default:
692	goto terr;
693    }
694
695    t->tm_isdst = -1;		/* Figure out DST. */
696    tv[0].tv_sec = tv[1].tv_sec = mktime(t);
697    if (tv[0].tv_sec != -1)
698	return tv[0].tv_sec;
699    else
700terr:
701	panic(
702	   "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
703}
704
705static long *
706get_job_list(int argc, char *argv[], int *joblen)
707{
708    int i, len;
709    long *joblist;
710    char *ep;
711
712    joblist = NULL;
713    len = argc;
714    if (len > 0) {
715	if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
716	    panic("out of memory");
717
718	for (i = 0; i < argc; i++) {
719	    errno = 0;
720	    if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
721		ep == argv[i] || *ep != '\0' || errno)
722		panic("invalid job number");
723	}
724    }
725
726    *joblen = len;
727    return joblist;
728}
729
730int
731main(int argc, char **argv)
732{
733    int c;
734    char queue = DEFAULT_AT_QUEUE;
735    char queue_set = 0;
736    char *pgm;
737
738    int program = AT;			/* our default program */
739    const char *options = "q:f:t:rmvldbc"; /* default options for at */
740    time_t timer;
741    long *joblist;
742    int joblen;
743
744    joblist = NULL;
745    joblen = 0;
746    timer = -1;
747    RELINQUISH_PRIVS
748
749    /* Eat any leading paths
750     */
751    if ((pgm = strrchr(argv[0], '/')) == NULL)
752	pgm = argv[0];
753    else
754        pgm++;
755
756    namep = pgm;
757
758    /* find out what this program is supposed to do
759     */
760    if (strcmp(pgm, "atq") == 0) {
761	program = ATQ;
762	options = "q:v";
763    }
764    else if (strcmp(pgm, "atrm") == 0) {
765	program = ATRM;
766	options = "";
767    }
768    else if (strcmp(pgm, "batch") == 0) {
769	program = BATCH;
770	options = "f:q:mv";
771    }
772
773    /* process whatever options we can process
774     */
775    opterr=1;
776    while ((c=getopt(argc, argv, options)) != -1)
777	switch (c) {
778	case 'v':   /* verify time settings */
779	    atverify = 1;
780	    break;
781
782	case 'm':   /* send mail when job is complete */
783	    send_mail = 1;
784	    break;
785
786	case 'f':
787	    atinput = optarg;
788	    break;
789
790	case 'q':    /* specify queue */
791	    if (strlen(optarg) > 1)
792		usage();
793
794	    atqueue = queue = *optarg;
795	    if (!(islower(queue)||isupper(queue)))
796		usage();
797
798	    queue_set = 1;
799	    break;
800
801	case 'd':
802	    warnx("-d is deprecated; use -r instead");
803	    /* fall through to 'r' */
804
805	case 'r':
806	    if (program != AT)
807		usage();
808
809	    program = ATRM;
810	    options = "";
811	    break;
812
813	case 't':
814	    if (program != AT)
815		usage();
816	    timer = ttime(optarg);
817	    break;
818
819	case 'l':
820	    if (program != AT)
821		usage();
822
823	    program = ATQ;
824	    options = "q:";
825	    break;
826
827	case 'b':
828	    if (program != AT)
829		usage();
830
831	    program = BATCH;
832	    options = "f:q:mv";
833	    break;
834
835	case 'c':
836	    program = CAT;
837	    options = "";
838	    break;
839
840	default:
841	    usage();
842	    break;
843	}
844    /* end of options eating
845     */
846
847    /* select our program
848     */
849    if(!check_permission())
850	errx(EXIT_FAILURE, "you do not have permission to use this program");
851    switch (program) {
852    case ATQ:
853
854	REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
855
856	if (queue_set == 0)
857	    joblist = get_job_list(argc - optind, argv + optind, &joblen);
858	list_jobs(joblist, joblen);
859	break;
860
861    case ATRM:
862
863	REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
864
865	process_jobs(argc, argv, ATRM);
866	break;
867
868    case CAT:
869
870	process_jobs(argc, argv, CAT);
871	break;
872
873    case AT:
874	/*
875	 * If timer is > -1, then the user gave the time with -t.  In that
876	 * case, it's already been set. If not, set it now.
877	 */
878	if (timer == -1)
879	    timer = parsetime(argc, argv);
880
881	if (atverify)
882	{
883	    struct tm *tm = localtime(&timer);
884	    fprintf(stderr, "%s\n", asctime(tm));
885	}
886	writefile(timer, queue);
887	break;
888
889    case BATCH:
890	if (queue_set)
891	    queue = toupper(queue);
892	else
893	    queue = DEFAULT_BATCH_QUEUE;
894
895	if (argc > optind)
896	    timer = parsetime(argc, argv);
897	else
898	    timer = time(NULL);
899
900	if (atverify)
901	{
902	    struct tm *tm = localtime(&timer);
903	    fprintf(stderr, "%s\n", asctime(tm));
904	}
905
906        writefile(timer, queue);
907	break;
908
909    default:
910	panic("internal error");
911	break;
912    }
913    exit(EXIT_SUCCESS);
914}
915