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/usr.bin/at/at.c

https://bitbucket.org/freebsd/freebsd-head/
C | 890 lines | 613 code | 155 blank | 122 comment | 176 complexity | 990f9f66d43fd13971d5e6ab21ca1039 MD5 | raw file
  1/* 
  2 *  at.c : Put file into atrun queue
  3 *  Copyright (C) 1993, 1994 Thomas Koenig
  4 *
  5 *  Atrun & Atq modifications
  6 *  Copyright (C) 1993  David Parsons
  7 *
  8 * Redistribution and use in source and binary forms, with or without
  9 * modification, are permitted provided that the following conditions
 10 * are met:
 11 * 1. Redistributions of source code must retain the above copyright
 12 *    notice, this list of conditions and the following disclaimer.
 13 * 2. The name of the author(s) may not be used to endorse or promote
 14 *    products derived from this software without specific prior written
 15 *    permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 20 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 24 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 27 */
 28
 29#include <sys/cdefs.h>
 30__FBSDID("$FreeBSD$");
 31
 32#define _USE_BSD 1
 33
 34/* System Headers */
 35
 36#include <sys/param.h>
 37#include <sys/stat.h>
 38#include <sys/time.h>
 39#include <sys/wait.h>
 40#include <ctype.h>
 41#include <dirent.h>
 42#include <err.h>
 43#include <errno.h>
 44#include <fcntl.h>
 45#ifndef __FreeBSD__
 46#include <getopt.h>
 47#endif
 48#ifdef __FreeBSD__
 49#include <locale.h>
 50#endif
 51#include <pwd.h>
 52#include <signal.h>
 53#include <stddef.h>
 54#include <stdio.h>
 55#include <stdlib.h>
 56#include <string.h>
 57#include <time.h>
 58#include <unistd.h>
 59
 60/* Local headers */
 61
 62#include "at.h"
 63#include "panic.h"
 64#include "parsetime.h"
 65#include "perm.h"
 66
 67#define MAIN
 68#include "privs.h"
 69
 70/* Macros */
 71
 72#ifndef ATJOB_DIR 
 73#define ATJOB_DIR "/usr/spool/atjobs/"
 74#endif
 75
 76#ifndef LFILE
 77#define LFILE ATJOB_DIR ".lockfile"
 78#endif
 79
 80#ifndef ATJOB_MX
 81#define ATJOB_MX 255
 82#endif
 83
 84#define ALARMC 10 /* Number of seconds to wait for timeout */
 85
 86#define SIZE 255
 87#define TIMESIZE 50
 88
 89enum { ATQ, ATRM, AT, BATCH, CAT };	/* what program we want to run */
 90
 91/* File scope variables */
 92
 93static const char *no_export[] = {
 94    "TERM", "TERMCAP", "DISPLAY", "_"
 95};
 96static int send_mail = 0;
 97static char *atinput = NULL;	/* where to get input from */
 98static char atqueue = 0;	/* which queue to examine for jobs (atq) */
 99
100/* External variables */
101
102extern char **environ;
103int fcreated;
104char atfile[] = ATJOB_DIR "12345678901234";
105char atverify = 0;		/* verify time instead of queuing job */
106char *namep;
107
108/* Function declarations */
109
110static void sigc(int signo);
111static void alarmc(int signo);
112static char *cwdname(void);
113static void writefile(time_t runtimer, char queue);
114static void list_jobs(long *, int);
115static long nextjob(void);
116static time_t ttime(const char *arg);
117static int in_job_list(long, long *, int);
118static long *get_job_list(int, char *[], int *);
119
120/* Signal catching functions */
121
122static void sigc(int signo __unused)
123{
124/* If the user presses ^C, remove the spool file and exit 
125 */
126    if (fcreated)
127    {
128	PRIV_START
129	    unlink(atfile);
130	PRIV_END
131    }
132
133    _exit(EXIT_FAILURE);
134}
135
136static void alarmc(int signo __unused)
137{
138    char buf[1024];
139
140    /* Time out after some seconds. */
141    strlcpy(buf, namep, sizeof(buf));
142    strlcat(buf, ": file locking timed out\n", sizeof(buf));
143    write(STDERR_FILENO, buf, strlen(buf));
144    sigc(0);
145}
146
147/* Local functions */
148
149static char *cwdname(void)
150{
151/* Read in the current directory; the name will be overwritten on
152 * subsequent calls.
153 */
154    static char *ptr = NULL;
155    static size_t size = SIZE;
156
157    if (ptr == NULL)
158	if ((ptr = malloc(size)) == NULL)
159	    errx(EXIT_FAILURE, "virtual memory exhausted");
160
161    while (1)
162    {
163	if (ptr == NULL)
164	    panic("out of memory");
165
166	if (getcwd(ptr, size-1) != NULL)
167	    return ptr;
168	
169	if (errno != ERANGE)
170	    perr("cannot get directory");
171	
172	free (ptr);
173	size += SIZE;
174	if ((ptr = malloc(size)) == NULL)
175	    errx(EXIT_FAILURE, "virtual memory exhausted");
176    }
177}
178
179static long
180nextjob(void)
181{
182    long jobno;
183    FILE *fid;
184
185    if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
186	if (fscanf(fid, "%5lx", &jobno) == 1) {
187	    rewind(fid);
188	    jobno = (1+jobno) % 0xfffff;	/* 2^20 jobs enough? */
189	    fprintf(fid, "%05lx\n", jobno);
190	}
191	else
192	    jobno = EOF;
193	fclose(fid);
194	return jobno;
195    }
196    else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
197	fprintf(fid, "%05lx\n", jobno = 1);
198	fclose(fid);
199	return 1;
200    }
201    return EOF;
202}
203
204static void
205writefile(time_t runtimer, char queue)
206{
207/* This does most of the work if at or batch are invoked for writing a job.
208 */
209    long jobno;
210    char *ap, *ppos, *mailname;
211    struct passwd *pass_entry;
212    struct stat statbuf;
213    int fdes, lockdes, fd2;
214    FILE *fp, *fpin;
215    struct sigaction act;
216    char **atenv;
217    int ch;
218    mode_t cmask;
219    struct flock lock;
220    
221#ifdef __FreeBSD__
222    (void) setlocale(LC_TIME, "");
223#endif
224
225/* Install the signal handler for SIGINT; terminate after removing the
226 * spool file if necessary
227 */
228    act.sa_handler = sigc;
229    sigemptyset(&(act.sa_mask));
230    act.sa_flags = 0;
231
232    sigaction(SIGINT, &act, NULL);
233
234    ppos = atfile + strlen(ATJOB_DIR);
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    sprintf(ppos, "%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 != (char *) 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<sizeof(no_export)/sizeof(no_export[0]); 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    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    struct stat buf;
535    DIR *spool;
536    struct dirent *dirent;
537    unsigned long ctm;
538    char queue;
539    long jobno;
540
541    PRIV_START
542
543    if (chdir(ATJOB_DIR) != 0)
544	perr("cannot change to " ATJOB_DIR);
545
546    if ((spool = opendir(".")) == NULL)
547	perr("cannot open " ATJOB_DIR);
548
549    PRIV_END
550
551    /*	Loop over every file in the directory 
552     */
553    while((dirent = readdir(spool)) != NULL) {
554
555	PRIV_START
556	if (stat(dirent->d_name, &buf) != 0)
557	    perr("cannot stat in " ATJOB_DIR);
558	PRIV_END
559
560	if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
561	    continue;
562
563	for (i=optind; i < argc; i++) {
564	    if (atoi(argv[i]) == jobno) {
565		if ((buf.st_uid != real_uid) && !(real_uid == 0))
566		    errx(EXIT_FAILURE, "%s: not owner", argv[i]);
567		switch (what) {
568		  case ATRM:
569
570		    PRIV_START
571
572		    if (unlink(dirent->d_name) != 0)
573		        perr(dirent->d_name);
574
575		    PRIV_END
576
577		    break;
578
579		  case CAT:
580		    {
581			FILE *fp;
582			int ch;
583
584			PRIV_START
585
586			fp = fopen(dirent->d_name,"r");
587
588			PRIV_END
589
590			if (!fp) {
591			    perr("cannot open file");
592			}
593			while((ch = getc(fp)) != EOF) {
594			    putchar(ch);
595			}
596			fclose(fp);
597		    }
598		    break;
599
600		  default:
601		    errx(EXIT_FAILURE, "internal error, process_jobs = %d",
602			what);
603	        }
604	    }
605	}
606    }
607    closedir(spool);
608} /* delete_jobs */
609
610#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
611
612static time_t
613ttime(const char *arg)
614{
615    /*
616     * This is pretty much a copy of stime_arg1() from touch.c.  I changed
617     * the return value and the argument list because it's more convenient
618     * (IMO) to do everything in one place. - Joe Halpin
619     */
620    struct timeval tv[2];
621    time_t now;
622    struct tm *t;
623    int yearset;
624    char *p;
625    
626    if (gettimeofday(&tv[0], NULL))
627	panic("Cannot get current time");
628    
629    /* Start with the current time. */
630    now = tv[0].tv_sec;
631    if ((t = localtime(&now)) == NULL)
632	panic("localtime");
633    /* [[CC]YY]MMDDhhmm[.SS] */
634    if ((p = strchr(arg, '.')) == NULL)
635	t->tm_sec = 0;		/* Seconds defaults to 0. */
636    else {
637	if (strlen(p + 1) != 2)
638	    goto terr;
639	*p++ = '\0';
640	t->tm_sec = ATOI2(p);
641    }
642    
643    yearset = 0;
644    switch(strlen(arg)) {
645    case 12:			/* CCYYMMDDhhmm */
646	t->tm_year = ATOI2(arg);
647	t->tm_year *= 100;
648	yearset = 1;
649	/* FALLTHROUGH */
650    case 10:			/* YYMMDDhhmm */
651	if (yearset) {
652	    yearset = ATOI2(arg);
653	    t->tm_year += yearset;
654	} else {
655	    yearset = ATOI2(arg);
656	    t->tm_year = yearset + 2000;
657	}
658	t->tm_year -= 1900;	/* Convert to UNIX time. */
659	/* FALLTHROUGH */
660    case 8:				/* MMDDhhmm */
661	t->tm_mon = ATOI2(arg);
662	--t->tm_mon;		/* Convert from 01-12 to 00-11 */
663	t->tm_mday = ATOI2(arg);
664	t->tm_hour = ATOI2(arg);
665	t->tm_min = ATOI2(arg);
666	break;
667    default:
668	goto terr;
669    }
670    
671    t->tm_isdst = -1;		/* Figure out DST. */
672    tv[0].tv_sec = tv[1].tv_sec = mktime(t);
673    if (tv[0].tv_sec != -1)
674	return tv[0].tv_sec;
675    else
676terr:
677	panic(
678	   "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
679}
680
681static long *
682get_job_list(int argc, char *argv[], int *joblen)
683{
684    int i, len;
685    long *joblist;
686    char *ep;
687
688    joblist = NULL;
689    len = argc;
690    if (len > 0) {
691	if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
692	    panic("out of memory");
693
694	for (i = 0; i < argc; i++) {
695	    errno = 0;
696	    if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
697		ep == argv[i] || *ep != '\0' || errno)
698		panic("invalid job number");
699	}
700    }
701
702    *joblen = len;
703    return joblist;
704}
705
706int
707main(int argc, char **argv)
708{
709    int c;
710    char queue = DEFAULT_AT_QUEUE;
711    char queue_set = 0;
712    char *pgm;
713
714    int program = AT;			/* our default program */
715    const char *options = "q:f:t:rmvldbc"; /* default options for at */
716    time_t timer;
717    long *joblist;
718    int joblen;
719
720    joblist = NULL;
721    joblen = 0;
722    timer = -1;
723    RELINQUISH_PRIVS
724
725    /* Eat any leading paths
726     */
727    if ((pgm = strrchr(argv[0], '/')) == NULL)
728	pgm = argv[0];
729    else
730        pgm++;
731
732    namep = pgm;
733
734    /* find out what this program is supposed to do
735     */
736    if (strcmp(pgm, "atq") == 0) {
737	program = ATQ;
738	options = "q:v";
739    }
740    else if (strcmp(pgm, "atrm") == 0) {
741	program = ATRM;
742	options = "";
743    }
744    else if (strcmp(pgm, "batch") == 0) {
745	program = BATCH;
746	options = "f:q:mv";
747    }
748
749    /* process whatever options we can process
750     */
751    opterr=1;
752    while ((c=getopt(argc, argv, options)) != -1)
753	switch (c) {
754	case 'v':   /* verify time settings */
755	    atverify = 1;
756	    break;
757
758	case 'm':   /* send mail when job is complete */
759	    send_mail = 1;
760	    break;
761
762	case 'f':
763	    atinput = optarg;
764	    break;
765	    
766	case 'q':    /* specify queue */
767	    if (strlen(optarg) > 1)
768		usage();
769
770	    atqueue = queue = *optarg;
771	    if (!(islower(queue)||isupper(queue)))
772		usage();
773
774	    queue_set = 1;
775	    break;
776
777	case 'd':
778	    warnx("-d is deprecated; use -r instead");
779	    /* fall through to 'r' */
780
781	case 'r':
782	    if (program != AT)
783		usage();
784
785	    program = ATRM;
786	    options = "";
787	    break;
788
789	case 't':
790	    if (program != AT)
791		usage();
792	    timer = ttime(optarg);
793	    break;
794
795	case 'l':
796	    if (program != AT)
797		usage();
798
799	    program = ATQ;
800	    options = "q:";
801	    break;
802
803	case 'b':
804	    if (program != AT)
805		usage();
806
807	    program = BATCH;
808	    options = "f:q:mv";
809	    break;
810
811	case 'c':
812	    program = CAT;
813	    options = "";
814	    break;
815
816	default:
817	    usage();
818	    break;
819	}
820    /* end of options eating
821     */
822
823    /* select our program
824     */
825    if(!check_permission())
826	errx(EXIT_FAILURE, "you do not have permission to use this program");
827    switch (program) {
828    case ATQ:
829
830	REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
831
832	if (queue_set == 0)
833	    joblist = get_job_list(argc - optind, argv + optind, &joblen);
834	list_jobs(joblist, joblen);
835	break;
836
837    case ATRM:
838
839	REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
840
841	process_jobs(argc, argv, ATRM);
842	break;
843
844    case CAT:
845
846	process_jobs(argc, argv, CAT);
847	break;
848
849    case AT:
850	/*
851	 * If timer is > -1, then the user gave the time with -t.  In that
852	 * case, it's already been set. If not, set it now.  
853	 */
854	if (timer == -1) 
855	    timer = parsetime(argc, argv);
856
857	if (atverify)
858	{
859	    struct tm *tm = localtime(&timer);
860	    fprintf(stderr, "%s\n", asctime(tm));
861	}
862	writefile(timer, queue);
863	break;
864
865    case BATCH:
866	if (queue_set)
867	    queue = toupper(queue);
868	else
869	    queue = DEFAULT_BATCH_QUEUE;
870
871	if (argc > optind)
872	    timer = parsetime(argc, argv);
873	else
874	    timer = time(NULL);
875	
876	if (atverify)
877	{
878	    struct tm *tm = localtime(&timer);
879	    fprintf(stderr, "%s\n", asctime(tm));
880	}
881
882        writefile(timer, queue);
883	break;
884
885    default:
886	panic("internal error");
887	break;
888    }
889    exit(EXIT_SUCCESS);
890}