xref: /dragonfly/usr.bin/at/at.c (revision d50f9ae3)
1 /*
2  *  at.c : Put file into atrun queue
3  *  Copyright (C) 1993, 1994 Thomas Koenig
4  *
5  *  Atrun & Atq modifications
6  *  Copyright (C) 1993  David Parsons
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. The name of the author(s) may not be used to endorse or promote
14  *    products derived from this software without specific prior written
15  *    permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  * $FreeBSD: src/usr.bin/at/at.c,v 1.30 2007/09/21 01:55:11 kevlo Exp $
29  */
30 
31 #define _USE_BSD 1
32 
33 /* System Headers */
34 
35 #include <sys/param.h>
36 #include <sys/stat.h>
37 #include <sys/time.h>
38 #include <sys/wait.h>
39 #include <ctype.h>
40 #include <dirent.h>
41 #include <err.h>
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <langinfo.h>
45 #include <locale.h>
46 #include <pwd.h>
47 #include <signal.h>
48 #include <stddef.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <time.h>
53 #include <unistd.h>
54 
55 /* Local headers */
56 
57 #include "at.h"
58 #include "panic.h"
59 #include "parsetime.h"
60 #include "perm.h"
61 
62 #define MAIN
63 #include "privs.h"
64 
65 /* Macros */
66 
67 #ifndef ATJOB_DIR
68 #define ATJOB_DIR "/usr/spool/atjobs/"
69 #endif
70 
71 #ifndef LFILE
72 #define LFILE ATJOB_DIR ".lockfile"
73 #endif
74 
75 #ifndef ATJOB_MX
76 #define ATJOB_MX 255
77 #endif
78 
79 #define ALARMC 10 /* Number of seconds to wait for timeout */
80 
81 #define SIZE 255
82 #define TIMESIZE 50
83 
84 enum { ATQ, ATRM, AT, BATCH, CAT };	/* what program we want to run */
85 
86 /* File scope variables */
87 
88 static const char *no_export[] =
89 {
90     "TERM", "TERMCAP", "DISPLAY", "_"
91 };
92 static int send_mail = 0;
93 
94 /* External variables */
95 uid_t real_uid, effective_uid;
96 gid_t real_gid, effective_gid;
97 
98 extern char **environ;
99 int fcreated;
100 char atfile[sizeof(ATJOB_DIR) + 14] = ATJOB_DIR;
101 
102 static char *atinput = NULL;	/* where to get input from */
103 static char atqueue = 0;	/* which queue to examine for jobs (atq) */
104 char atverify = 0;		/* verify time instead of queuing job */
105 char *namep;
106 
107 /* Function declarations */
108 
109 static void sigc(int signo);
110 static void alarmc(int signo);
111 static char *cwdname(void);
112 static void writefile(time_t runtimer, char queue);
113 static void list_jobs(long *, int);
114 static long nextjob(void);
115 static time_t ttime(const char *arg);
116 static char * timer2str(time_t runtimer);
117 static int in_job_list(long, long *, int);
118 static long *get_job_list(int, char *[], int *);
119 
120 /* Signal catching functions */
121 
122 static void
sigc(int signo __unused)123 sigc(int signo __unused)
124 {
125 /* If the user presses ^C, remove the spool file and exit
126  */
127     if (fcreated)
128     {
129 	PRIV_START
130 	    unlink(atfile);
131 	PRIV_END
132     }
133 
134     _exit(EXIT_FAILURE);
135 }
136 
137 static void
alarmc(int signo __unused)138 alarmc(int signo __unused)
139 {
140     char buf[1024];
141 
142     /* Time out after some seconds. */
143     strlcpy(buf, namep, sizeof(buf));
144     strlcat(buf, ": file locking timed out\n", sizeof(buf));
145     write(STDERR_FILENO, buf, strlen(buf));
146     sigc(0);
147 }
148 
149 /* Local functions */
150 
151 static char *
cwdname(void)152 cwdname(void)
153 {
154 /* Read in the current directory; the name will be overwritten on
155  * subsequent calls.
156  */
157     static char *ptr = NULL;
158     static size_t size = SIZE;
159 
160     if (ptr == NULL)
161 	if ((ptr = malloc(size)) == NULL)
162 	    errx(EXIT_FAILURE, "virtual memory exhausted");
163 
164     while (1)
165     {
166 	if (ptr == NULL)
167 	    panic("out of memory");
168 
169 	if (getcwd(ptr, size-1) != NULL)
170 	    return ptr;
171 
172 	if (errno != ERANGE)
173 	    perr("cannot get directory");
174 
175 	free (ptr);
176 	size += SIZE;
177 	if ((ptr = malloc(size)) == NULL)
178 	    errx(EXIT_FAILURE, "virtual memory exhausted");
179     }
180 }
181 
182 static long
nextjob(void)183 nextjob(void)
184 {
185     long jobno;
186     FILE *fid;
187 
188     if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
189 	if (fscanf(fid, "%5lx", &jobno) == 1) {
190 	    rewind(fid);
191 	    jobno = (1+jobno) % 0xfffff;	/* 2^20 jobs enough? */
192 	    fprintf(fid, "%05lx\n", jobno);
193 	}
194 	else
195 	    jobno = EOF;
196 	fclose(fid);
197 	return jobno;
198     }
199     else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
200 	fprintf(fid, "%05lx\n", jobno = 1);
201 	fclose(fid);
202 	return 1;
203     }
204     return EOF;
205 }
206 
207 static void
writefile(time_t runtimer,char queue)208 writefile(time_t runtimer, char queue)
209 {
210 /* This does most of the work if at or batch are invoked for writing a job.
211  */
212     long jobno;
213     char *ap, *ppos, *mailname;
214     struct passwd *pass_entry;
215     struct stat statbuf;
216     int fdes, lockdes, fd2;
217     FILE *fp, *fpin;
218     struct sigaction act;
219     char **atenv;
220     int ch;
221     mode_t cmask;
222     struct flock lock;
223 
224     setlocale(LC_TIME, "");
225 
226 /* Install the signal handler for SIGINT; terminate after removing the
227  * spool file if necessary
228  */
229     act.sa_handler = sigc;
230     sigemptyset(&(act.sa_mask));
231     act.sa_flags = 0;
232 
233     sigaction(SIGINT, &act, NULL);
234 
235     /* Loop over all possible file names for running something at this
236      * particular time, see if a file is there; the first empty slot at any
237      * particular time is used.  Lock the file LFILE first to make sure
238      * we're alone when doing this.
239      */
240 
241     PRIV_START
242 
243     if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
244 	perr("cannot open lockfile " LFILE);
245 
246     lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
247     lock.l_len = 0;
248 
249     act.sa_handler = alarmc;
250     sigemptyset(&(act.sa_mask));
251     act.sa_flags = 0;
252 
253     /* Set an alarm so a timeout occurs after ALARMC seconds, in case
254      * something is seriously broken.
255      */
256     sigaction(SIGALRM, &act, NULL);
257     alarm(ALARMC);
258     fcntl(lockdes, F_SETLKW, &lock);
259     alarm(0);
260 
261     if ((jobno = nextjob()) == EOF)
262 	perr("cannot generate job number");
263 
264     ppos = atfile + strlen(atfile);
265     snprintf(ppos, sizeof(atfile) - strlen(atfile), "%c%5lx%8lx", queue,
266 	     jobno, (unsigned long) (runtimer/60));
267 
268     for(ap=ppos; *ap != '\0'; ap ++)
269 	if (*ap == ' ')
270 	    *ap = '0';
271 
272     if (stat(atfile, &statbuf) != 0)
273 	if (errno != ENOENT)
274 	    perr("cannot access " ATJOB_DIR);
275 
276     /* Create the file. The x bit is only going to be set after it has
277      * been completely written out, to make sure it is not executed in the
278      * meantime.  To make sure they do not get deleted, turn off their r
279      * bit.  Yes, this is a kluge.
280      */
281     cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
282     if ((fdes = creat(atfile, O_WRONLY)) == -1)
283 	perr("cannot create atjob file");
284 
285     if ((fd2 = dup(fdes)) <0)
286 	perr("error in dup() of job file");
287 
288     if(fchown(fd2, real_uid, real_gid) != 0)
289 	perr("cannot give away file");
290 
291     PRIV_END
292 
293     /* We no longer need suid root; now we just need to be able to write
294      * to the directory, if necessary.
295      */
296 
297     REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
298 
299     /* We've successfully created the file; let's set the flag so it
300      * gets removed in case of an interrupt or error.
301      */
302     fcreated = 1;
303 
304     /* Now we can release the lock, so other people can access it
305      */
306     lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
307     lock.l_len = 0;
308     fcntl(lockdes, F_SETLKW, &lock);
309     close(lockdes);
310 
311     if((fp = fdopen(fdes, "w")) == NULL)
312 	panic("cannot reopen atjob file");
313 
314     /* Get the userid to mail to, first by trying getlogin(),
315      * then from LOGNAME, finally from getpwuid().
316      */
317     mailname = getlogin();
318     if (mailname == NULL)
319 	mailname = getenv("LOGNAME");
320 
321     if ((mailname == NULL) || (mailname[0] == '\0')
322 	|| (strlen(mailname) >= MAXLOGNAME) || (getpwnam(mailname)==NULL))
323     {
324 	pass_entry = getpwuid(real_uid);
325 	if (pass_entry != NULL)
326 	    mailname = pass_entry->pw_name;
327     }
328 
329     if (atinput != NULL)
330     {
331 	fpin = freopen(atinput, "r", stdin);
332 	if (fpin == NULL)
333 	    perr("cannot open input file");
334     }
335     fprintf(fp, "#!/bin/sh\n# atrun uid=%ld gid=%ld\n# mail %*s %d\n",
336 	(long) real_uid, (long) real_gid, MAXLOGNAME - 1, mailname,
337 	send_mail);
338 
339     /* Write out the umask at the time of invocation
340      */
341     fprintf(fp, "umask %lo\n", (unsigned long) cmask);
342 
343     /* Write out the environment. Anything that may look like a
344      * special character to the shell is quoted, except for \n, which is
345      * done with a pair of "'s.  Don't export the no_export list (such
346      * as TERM or DISPLAY) because we don't want these.
347      */
348     for (atenv= environ; *atenv != NULL; atenv++)
349     {
350 	int export = 1;
351 	char *eqp;
352 
353 	eqp = strchr(*atenv, '=');
354 	if (ap == NULL)
355 	    eqp = *atenv;
356 	else
357 	{
358 	    size_t i;
359 	    for (i=0; i<NELEM(no_export); i++)
360 	    {
361 		export = export
362 		    && (strncmp(*atenv, no_export[i],
363 				(size_t) (eqp-*atenv)) != 0);
364 	    }
365 	    eqp++;
366 	}
367 
368 	if (export)
369 	{
370 	    fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
371 	    for(ap = eqp;*ap != '\0'; ap++)
372 	    {
373 		if (*ap == '\n')
374 		    fprintf(fp, "\"\n\"");
375 		else
376 		{
377 		    if (!isalnum(*ap)) {
378 			switch (*ap) {
379 			  case '%': case '/': case '{': case '[':
380 			  case ']': case '=': case '}': case '@':
381 			  case '+': case '#': case ',': case '.':
382 			  case ':': case '-': case '_':
383 			    break;
384 			  default:
385 			    fputc('\\', fp);
386 			    break;
387 			}
388 		    }
389 		    fputc(*ap, fp);
390 		}
391 	    }
392 	    fputs("; export ", fp);
393 	    fwrite(*atenv, sizeof(char), eqp-*atenv -1, fp);
394 	    fputc('\n', fp);
395 
396 	}
397     }
398     /* Cd to the directory at the time and write out all the
399      * commands the user supplies from stdin.
400      */
401     fprintf(fp, "cd ");
402     for (ap = cwdname(); *ap != '\0'; ap++)
403     {
404 	if (*ap == '\n')
405 	    fprintf(fp, "\"\n\"");
406 	else
407 	{
408 	    if (*ap != '/' && !isalnum(*ap))
409 		fputc('\\', fp);
410 
411 	    fputc(*ap, fp);
412 	}
413     }
414     /* Test cd's exit status: die if the original directory has been
415      * removed, become unreadable or whatever
416      */
417     fprintf(fp, " || {\n\t echo 'Execution directory "
418 	        "inaccessible' >&2\n\t exit 1\n}\n");
419 
420     while((ch = getchar()) != EOF)
421 	fputc(ch, fp);
422 
423     fprintf(fp, "\n");
424     if (ferror(fp))
425 	panic("output error");
426 
427     if (ferror(stdin))
428 	panic("input error");
429 
430     fclose(fp);
431 
432     /* Set the x bit so that we're ready to start executing
433      */
434 
435     if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
436 	perr("cannot give away file");
437 
438     close(fd2);
439 
440     /* Print output. */
441     char *timestr = timer2str(runtimer);
442 
443     fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
444     fprintf(stderr, "Job %ld at %s\n", jobno, timestr);
445     free(timestr);
446 }
447 
448 static int
in_job_list(long job,long * joblist,int len)449 in_job_list(long job, long *joblist, int len)
450 {
451     int i;
452 
453     for (i = 0; i < len; i++)
454 	if (job == joblist[i])
455 	    return 1;
456 
457     return 0;
458 }
459 
460 static void
list_jobs(long * joblist,int len)461 list_jobs(long *joblist, int len)
462 {
463     /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
464      * or everybody's if we are root
465      */
466     struct passwd *pw;
467     DIR *spool;
468     struct dirent *dirent;
469     struct stat buf;
470     unsigned long ctm;
471     char queue;
472     long jobno;
473     time_t runtimer;
474     char *timestr;
475     int first=1;
476 
477     setlocale(LC_TIME, "");
478 
479     PRIV_START
480 
481     if (chdir(ATJOB_DIR) != 0)
482 	perr("cannot change to " ATJOB_DIR);
483 
484     if ((spool = opendir(".")) == NULL)
485 	perr("cannot open " ATJOB_DIR);
486 
487     /*	Loop over every file in the directory
488      */
489     while((dirent = readdir(spool)) != NULL) {
490 	if (stat(dirent->d_name, &buf) != 0)
491 	    perr("cannot stat in " ATJOB_DIR);
492 
493 	/* See it's a regular file and has its x bit turned on and
494          * is the user's
495          */
496 	if (!S_ISREG(buf.st_mode)
497 	    || ((buf.st_uid != real_uid) && ! (real_uid == 0))
498 	    || !(S_IXUSR & buf.st_mode || atverify))
499 	    continue;
500 
501 	if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
502 	    continue;
503 
504 	/* If jobs are given, only list those jobs */
505 	if (joblist && !in_job_list(jobno, joblist, len))
506 	    continue;
507 
508 	if (atqueue && (queue != atqueue))
509 	    continue;
510 
511 	/* Get datetime */
512         runtimer = 60*(time_t) ctm;
513         timestr = timer2str(runtimer);
514 
515 	/* Look up owner's uid in password database file */
516 	pw = getpwuid(buf.st_uid);
517 
518         if (first) {
519 		printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
520 		first=0;
521         }
522 	printf("%s\t%-16s%c%s\t%ld\n",
523 	       timestr,
524 	       pw ? pw->pw_name : "???",
525 	       queue,
526 	       (S_IXUSR & buf.st_mode) ? "":"(done)",
527 	       jobno);
528 	free(timestr);
529     }
530     closedir(spool);
531 
532     PRIV_END
533 }
534 
535 static void
process_jobs(int argc,char ** argv,int what)536 process_jobs(int argc, char **argv, int what)
537 {
538     /* Delete every argument (job - ID) given
539      */
540     int i;
541     struct stat buf;
542     DIR *spool;
543     struct dirent *dirent;
544     unsigned long ctm;
545     char queue;
546     long jobno;
547 
548     PRIV_START
549 
550     if (chdir(ATJOB_DIR) != 0)
551 	perr("cannot change to " ATJOB_DIR);
552 
553     if ((spool = opendir(".")) == NULL)
554 	perr("cannot open " ATJOB_DIR);
555 
556     PRIV_END
557 
558     /*	Loop over every file in the directory
559      */
560     while((dirent = readdir(spool)) != NULL) {
561 
562 	PRIV_START
563 	if (stat(dirent->d_name, &buf) != 0)
564 	    perr("cannot stat in " ATJOB_DIR);
565 	PRIV_END
566 
567 	if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
568 	    continue;
569 
570 	for (i=optind; i < argc; i++) {
571 	    if (atoi(argv[i]) == jobno) {
572 		if ((buf.st_uid != real_uid) && !(real_uid == 0))
573 		    errx(EXIT_FAILURE, "%s: not owner", argv[i]);
574 		switch (what) {
575 		  case ATRM:
576 
577 		    PRIV_START
578 
579 		    if (unlink(dirent->d_name) != 0)
580 		        perr(dirent->d_name);
581 
582 		    PRIV_END
583 
584 		    break;
585 
586 		  case CAT:
587 		    {
588 			FILE *fp;
589 			int ch;
590 
591 			PRIV_START
592 
593 			fp = fopen(dirent->d_name,"r");
594 
595 			PRIV_END
596 
597 			if (!fp) {
598 			    perr("cannot open file");
599 			}
600 			while((ch = getc(fp)) != EOF) {
601 			    putchar(ch);
602 			}
603 			fclose(fp);
604 		    }
605 		    break;
606 
607 		  default:
608 		    errx(EXIT_FAILURE, "internal error, process_jobs = %d",
609 			what);
610 	        }
611 	    }
612 	}
613     }
614     closedir(spool);
615 } /* delete_jobs */
616 
617 #define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
618 
619 static time_t
ttime(const char * arg)620 ttime(const char *arg)
621 {
622     /*
623      * This is pretty much a copy of stime_arg1() from touch.c.  I changed
624      * the return value and the argument list because it's more convenient
625      * (IMO) to do everything in one place. - Joe Halpin
626      */
627     struct timeval tv[2];
628     time_t now;
629     struct tm *t;
630     int yearset;
631     char *p;
632 
633     if (gettimeofday(&tv[0], NULL))
634 	panic("Cannot get current time");
635 
636     /* Start with the current time. */
637     now = tv[0].tv_sec;
638     if ((t = localtime(&now)) == NULL)
639 	panic("localtime");
640     /* [[CC]YY]MMDDhhmm[.SS] */
641     if ((p = strchr(arg, '.')) == NULL)
642 	t->tm_sec = 0;		/* Seconds defaults to 0. */
643     else {
644 	if (strlen(p + 1) != 2)
645 	    goto terr;
646 	*p++ = '\0';
647 	t->tm_sec = ATOI2(p);
648     }
649 
650     yearset = 0;
651     switch(strlen(arg)) {
652     case 12:			/* CCYYMMDDhhmm */
653 	t->tm_year = ATOI2(arg);
654 	t->tm_year *= 100;
655 	yearset = 1;
656 	/* FALLTHROUGH */
657     case 10:			/* YYMMDDhhmm */
658 	if (yearset) {
659 	    yearset = ATOI2(arg);
660 	    t->tm_year += yearset;
661 	} else {
662 	    yearset = ATOI2(arg);
663 	    t->tm_year = yearset + 2000;
664 	}
665 	t->tm_year -= 1900;	/* Convert to UNIX time. */
666 	/* FALLTHROUGH */
667     case 8:				/* MMDDhhmm */
668 	t->tm_mon = ATOI2(arg);
669 	--t->tm_mon;		/* Convert from 01-12 to 00-11 */
670 	t->tm_mday = ATOI2(arg);
671 	t->tm_hour = ATOI2(arg);
672 	t->tm_min = ATOI2(arg);
673 	break;
674     default:
675 	goto terr;
676     }
677 
678     t->tm_isdst = -1;		/* Figure out DST. */
679     tv[0].tv_sec = tv[1].tv_sec = mktime(t);
680     if (tv[0].tv_sec != -1)
681 	return tv[0].tv_sec;
682     else
683 terr:
684 	panic(
685 	   "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
686 }
687 
688 /* The caller must free up the memory. */
689 static char *
timer2str(time_t runtimer)690 timer2str(time_t runtimer)
691 {
692 	struct tm runtime;
693 	char *timestr;
694 	size_t rv;
695 
696 	timestr = malloc(TIMESIZE);
697 	if (timestr == NULL)
698 		panic("out of memory");
699 
700 	runtime = *localtime(&runtimer);
701 	rv = strftime(timestr, TIMESIZE, nl_langinfo(D_T_FMT), &runtime);
702 	if (rv == 0)
703 		panic("TIMESIZE too low");
704 
705 	return (timestr);
706 }
707 
708 static long *
get_job_list(int argc,char * argv[],int * joblen)709 get_job_list(int argc, char *argv[], int *joblen)
710 {
711     int i, len;
712     long *joblist;
713     char *ep;
714 
715     joblist = NULL;
716     len = argc;
717     if (len > 0) {
718 	if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
719 	    panic("out of memory");
720 
721 	for (i = 0; i < argc; i++) {
722 	    errno = 0;
723 	    if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
724 		ep == argv[i] || *ep != '\0' || errno)
725 		panic("invalid job number");
726 	}
727     }
728 
729     *joblen = len;
730     return joblist;
731 }
732 
733 int
main(int argc,char ** argv)734 main(int argc, char **argv)
735 {
736     int c;
737     char queue = DEFAULT_AT_QUEUE;
738     char queue_set = 0;
739     char *pgm;
740 
741     int program = AT;			/* our default program */
742     const char *options = "q:f:t:rmvldbc"; /* default options for at */
743     time_t timer;
744     long *joblist;
745     int joblen;
746 
747     joblist = NULL;
748     joblen = 0;
749     timer = -1;
750     RELINQUISH_PRIVS
751 
752     /* Eat any leading paths
753      */
754     if ((pgm = strrchr(argv[0], '/')) == NULL)
755 	pgm = argv[0];
756     else
757         pgm++;
758 
759     namep = pgm;
760 
761     /* find out what this program is supposed to do
762      */
763     if (strcmp(pgm, "atq") == 0) {
764 	program = ATQ;
765 	options = "q:v";
766     }
767     else if (strcmp(pgm, "atrm") == 0) {
768 	program = ATRM;
769 	options = "";
770     }
771     else if (strcmp(pgm, "batch") == 0) {
772 	program = BATCH;
773 	options = "f:q:mv";
774     }
775 
776     /* process whatever options we can process
777      */
778     opterr=1;
779     while ((c=getopt(argc, argv, options)) != -1)
780 	switch (c) {
781 	case 'v':   /* verify time settings */
782 	    atverify = 1;
783 	    break;
784 
785 	case 'm':   /* send mail when job is complete */
786 	    send_mail = 1;
787 	    break;
788 
789 	case 'f':
790 	    atinput = optarg;
791 	    break;
792 
793 	case 'q':    /* specify queue */
794 	    if (strlen(optarg) > 1)
795 		usage();
796 
797 	    atqueue = queue = *optarg;
798 	    if (!(islower(queue)||isupper(queue)))
799 		usage();
800 
801 	    queue_set = 1;
802 	    break;
803 
804 	case 'd':
805 	    warnx("-d is deprecated; use -r instead");
806 	    /* FALLTHROUGH */
807 
808 	case 'r':
809 	    if (program != AT)
810 		usage();
811 
812 	    program = ATRM;
813 	    options = "";
814 	    break;
815 
816 	case 't':
817 	    if (program != AT)
818 		usage();
819 	    timer = ttime(optarg);
820 	    break;
821 
822 	case 'l':
823 	    if (program != AT)
824 		usage();
825 
826 	    program = ATQ;
827 	    options = "q:";
828 	    break;
829 
830 	case 'b':
831 	    if (program != AT)
832 		usage();
833 
834 	    program = BATCH;
835 	    options = "f:q:mv";
836 	    break;
837 
838 	case 'c':
839 	    program = CAT;
840 	    options = "";
841 	    break;
842 
843 	default:
844 	    usage();
845 	    break;
846 	}
847     /* end of options eating
848      */
849 
850     /* select our program
851      */
852     if(!check_permission())
853 	errx(EXIT_FAILURE, "you do not have permission to use this program");
854     switch (program) {
855     case ATQ:
856 
857 	REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
858 
859 	if (queue_set == 0)
860 	    joblist = get_job_list(argc - optind, argv + optind, &joblen);
861 	list_jobs(joblist, joblen);
862 	break;
863 
864     case ATRM:
865 
866 	REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
867 
868 	process_jobs(argc, argv, ATRM);
869 	break;
870 
871     case CAT:
872 
873 	process_jobs(argc, argv, CAT);
874 	break;
875 
876     case AT:
877 	/*
878 	 * If timer is > -1, then the user gave the time with -t.  In that
879 	 * case, it's already been set. If not, set it now.
880 	 */
881 	if (timer == -1)
882 	    timer = parsetime(argc, argv);
883 
884 	if (atverify)
885 	{
886 	    struct tm *tm = localtime(&timer);
887 	    fprintf(stderr, "%s\n", asctime(tm));
888 	}
889 	writefile(timer, queue);
890 	break;
891 
892     case BATCH:
893 	if (queue_set)
894 	    queue = toupper(queue);
895 	else
896 	    queue = DEFAULT_BATCH_QUEUE;
897 
898 	if (argc > optind)
899 	    timer = parsetime(argc, argv);
900 	else
901 	    timer = time(NULL);
902 
903 	if (atverify)
904 	{
905 	    struct tm *tm = localtime(&timer);
906 	    fprintf(stderr, "%s\n", asctime(tm));
907 	}
908 
909         writefile(timer, queue);
910 	break;
911 
912     default:
913 	panic("internal error");
914 	break;
915     }
916     exit(EXIT_SUCCESS);
917 }
918