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