2 * at.c : Put file into atrun queue
3 * Copyright (C) 1993, 1994 Thomas Koenig
5 * Atrun & Atq modifications
6 * Copyright (C) 1993 David Parsons
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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
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.
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 $
36 #include <sys/param.h>
60 #include "parsetime.h"
69 #define ATJOB_DIR "/usr/spool/atjobs/"
73 #define LFILE ATJOB_DIR ".lockfile"
80 #define ALARMC 10 /* Number of seconds to wait for timeout */
85 enum { ATQ, ATRM, AT, BATCH, CAT }; /* what program we want to run */
87 /* File scope variables */
89 const char *no_export[] =
91 "TERM", "TERMCAP", "DISPLAY", "_"
93 static int send_mail = 0;
95 /* External variables */
96 uid_t real_uid, effective_uid;
97 gid_t real_gid, effective_gid;
99 extern char **environ;
101 char atfile[sizeof(ATJOB_DIR) + 14] = ATJOB_DIR;
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 */
108 /* Function declarations */
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 *);
121 /* Signal catching functions */
124 sigc(int signo __unused)
126 /* If the user presses ^C, remove the spool file and exit
139 alarmc(int signo __unused)
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));
150 /* Local functions */
155 /* Read in the current directory; the name will be overwritten on
158 static char *ptr = NULL;
159 static size_t size = SIZE;
162 if ((ptr = malloc(size)) == NULL)
163 errx(EXIT_FAILURE, "virtual memory exhausted");
168 panic("out of memory");
170 if (getcwd(ptr, size-1) != NULL)
174 perr("cannot get directory");
178 if ((ptr = malloc(size)) == NULL)
179 errx(EXIT_FAILURE, "virtual memory exhausted");
189 if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
190 if (fscanf(fid, "%5lx", &jobno) == 1) {
192 jobno = (1+jobno) % 0xfffff; /* 2^20 jobs enough? */
193 fprintf(fid, "%05lx\n", jobno);
200 else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
201 fprintf(fid, "%05lx\n", jobno = 1);
209 writefile(time_t runtimer, char queue)
211 /* This does most of the work if at or batch are invoked for writing a job.
214 char *ap, *ppos, *mailname;
215 struct passwd *pass_entry;
217 int fdes, lockdes, fd2;
219 struct sigaction act;
225 setlocale(LC_TIME, "");
227 /* Install the signal handler for SIGINT; terminate after removing the
228 * spool file if necessary
230 act.sa_handler = sigc;
231 sigemptyset(&(act.sa_mask));
234 sigaction(SIGINT, &act, NULL);
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.
244 if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
245 perr("cannot open lockfile " LFILE);
247 lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
250 act.sa_handler = alarmc;
251 sigemptyset(&(act.sa_mask));
254 /* Set an alarm so a timeout occurs after ALARMC seconds, in case
255 * something is seriously broken.
257 sigaction(SIGALRM, &act, NULL);
259 fcntl(lockdes, F_SETLKW, &lock);
262 if ((jobno = nextjob()) == EOF)
263 perr("cannot generate job number");
265 ppos = atfile + strlen(atfile);
266 snprintf(ppos, sizeof(atfile) - strlen(atfile), "%c%5lx%8lx", queue,
267 jobno, (unsigned long) (runtimer/60));
269 for(ap=ppos; *ap != '\0'; ap ++)
273 if (stat(atfile, &statbuf) != 0)
275 perr("cannot access " ATJOB_DIR);
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.
282 cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
283 if ((fdes = creat(atfile, O_WRONLY)) == -1)
284 perr("cannot create atjob file");
286 if ((fd2 = dup(fdes)) <0)
287 perr("error in dup() of job file");
289 if(fchown(fd2, real_uid, real_gid) != 0)
290 perr("cannot give away file");
294 /* We no longer need suid root; now we just need to be able to write
295 * to the directory, if necessary.
298 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
300 /* We've successfully created the file; let's set the flag so it
301 * gets removed in case of an interrupt or error.
305 /* Now we can release the lock, so other people can access it
307 lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
309 fcntl(lockdes, F_SETLKW, &lock);
312 if((fp = fdopen(fdes, "w")) == NULL)
313 panic("cannot reopen atjob file");
315 /* Get the userid to mail to, first by trying getlogin(),
316 * then from LOGNAME, finally from getpwuid().
318 mailname = getlogin();
319 if (mailname == NULL)
320 mailname = getenv("LOGNAME");
322 if ((mailname == NULL) || (mailname[0] == '\0')
323 || (strlen(mailname) >= MAXLOGNAME) || (getpwnam(mailname)==NULL))
325 pass_entry = getpwuid(real_uid);
326 if (pass_entry != NULL)
327 mailname = pass_entry->pw_name;
332 fpin = freopen(atinput, "r", stdin);
334 perr("cannot open input file");
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,
340 /* Write out the umask at the time of invocation
342 fprintf(fp, "umask %lo\n", (unsigned long) cmask);
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.
349 for (atenv= environ; *atenv != NULL; atenv++)
354 eqp = strchr(*atenv, '=');
360 for (i=0; i<sizeof(no_export)/sizeof(no_export[0]); i++)
363 && (strncmp(*atenv, no_export[i],
364 (size_t) (eqp-*atenv)) != 0);
371 fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
372 for(ap = eqp;*ap != '\0'; ap++)
375 fprintf(fp, "\"\n\"");
380 case '%': case '/': case '{': case '[':
381 case ']': case '=': case '}': case '@':
382 case '+': case '#': case ',': case '.':
383 case ':': case '-': case '_':
393 fputs("; export ", fp);
394 fwrite(*atenv, sizeof(char), eqp-*atenv -1, fp);
399 /* Cd to the directory at the time and write out all the
400 * commands the user supplies from stdin.
403 for (ap = cwdname(); *ap != '\0'; ap++)
406 fprintf(fp, "\"\n\"");
409 if (*ap != '/' && !isalnum(*ap))
415 /* Test cd's exit status: die if the original directory has been
416 * removed, become unreadable or whatever
418 fprintf(fp, " || {\n\t echo 'Execution directory "
419 "inaccessible' >&2\n\t exit 1\n}\n");
421 while((ch = getchar()) != EOF)
426 panic("output error");
429 panic("input error");
433 /* Set the x bit so that we're ready to start executing
436 if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
437 perr("cannot give away file");
442 char *timestr = timer2str(runtimer);
444 fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
445 fprintf(stderr, "Job %ld at %s\n", jobno, timestr);
450 in_job_list(long job, long *joblist, int len)
454 for (i = 0; i < len; i++)
455 if (job == joblist[i])
462 list_jobs(long *joblist, int len)
464 /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
465 * or everybody's if we are root
469 struct dirent *dirent;
478 setlocale(LC_TIME, "");
482 if (chdir(ATJOB_DIR) != 0)
483 perr("cannot change to " ATJOB_DIR);
485 if ((spool = opendir(".")) == NULL)
486 perr("cannot open " ATJOB_DIR);
488 /* Loop over every file in the directory
490 while((dirent = readdir(spool)) != NULL) {
491 if (stat(dirent->d_name, &buf) != 0)
492 perr("cannot stat in " ATJOB_DIR);
494 /* See it's a regular file and has its x bit turned on and
497 if (!S_ISREG(buf.st_mode)
498 || ((buf.st_uid != real_uid) && ! (real_uid == 0))
499 || !(S_IXUSR & buf.st_mode || atverify))
502 if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
505 /* If jobs are given, only list those jobs */
506 if (joblist && !in_job_list(jobno, joblist, len))
509 if (atqueue && (queue != atqueue))
513 runtimer = 60*(time_t) ctm;
514 timestr = timer2str(runtimer);
516 /* Look up owner's uid in password database file */
517 pw = getpwuid(buf.st_uid);
520 printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
523 printf("%s\t%-16s%c%s\t%ld\n",
525 pw ? pw->pw_name : "???",
527 (S_IXUSR & buf.st_mode) ? "":"(done)",
537 process_jobs(int argc, char **argv, int what)
539 /* Delete every argument (job - ID) given
544 struct dirent *dirent;
551 if (chdir(ATJOB_DIR) != 0)
552 perr("cannot change to " ATJOB_DIR);
554 if ((spool = opendir(".")) == NULL)
555 perr("cannot open " ATJOB_DIR);
559 /* Loop over every file in the directory
561 while((dirent = readdir(spool)) != NULL) {
564 if (stat(dirent->d_name, &buf) != 0)
565 perr("cannot stat in " ATJOB_DIR);
568 if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
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]);
580 if (unlink(dirent->d_name) != 0)
581 perr(dirent->d_name);
594 fp = fopen(dirent->d_name,"r");
599 perr("cannot open file");
601 while((ch = getc(fp)) != EOF) {
609 errx(EXIT_FAILURE, "internal error, process_jobs = %d",
618 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
621 ttime(const char *arg)
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
628 struct timeval tv[2];
634 if (gettimeofday(&tv[0], NULL))
635 panic("Cannot get current time");
637 /* Start with the current time. */
639 if ((t = localtime(&now)) == NULL)
641 /* [[CC]YY]MMDDhhmm[.SS] */
642 if ((p = strchr(arg, '.')) == NULL)
643 t->tm_sec = 0; /* Seconds defaults to 0. */
645 if (strlen(p + 1) != 2)
648 t->tm_sec = ATOI2(p);
652 switch(strlen(arg)) {
653 case 12: /* CCYYMMDDhhmm */
654 t->tm_year = ATOI2(arg);
658 case 10: /* YYMMDDhhmm */
660 yearset = ATOI2(arg);
661 t->tm_year += yearset;
663 yearset = ATOI2(arg);
664 t->tm_year = yearset + 2000;
666 t->tm_year -= 1900; /* Convert to UNIX time. */
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);
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)
686 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
689 /* The caller must free up the memory. */
691 timer2str(time_t runtimer)
697 timestr = malloc(TIMESIZE);
699 panic("out of memory");
701 runtime = *localtime(&runtimer);
702 rv = strftime(timestr, TIMESIZE, nl_langinfo(D_T_FMT), &runtime);
704 panic("TIMESIZE too low");
710 get_job_list(int argc, char *argv[], int *joblen)
719 if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
720 panic("out of memory");
722 for (i = 0; i < argc; i++) {
724 if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
725 ep == argv[i] || *ep != '\0' || errno)
726 panic("invalid job number");
735 main(int argc, char **argv)
738 char queue = DEFAULT_AT_QUEUE;
742 int program = AT; /* our default program */
743 const char *options = "q:f:t:rmvldbc"; /* default options for at */
753 /* Eat any leading paths
755 if ((pgm = strrchr(argv[0], '/')) == NULL)
762 /* find out what this program is supposed to do
764 if (strcmp(pgm, "atq") == 0) {
768 else if (strcmp(pgm, "atrm") == 0) {
772 else if (strcmp(pgm, "batch") == 0) {
777 /* process whatever options we can process
780 while ((c=getopt(argc, argv, options)) != -1)
782 case 'v': /* verify time settings */
786 case 'm': /* send mail when job is complete */
794 case 'q': /* specify queue */
795 if (strlen(optarg) > 1)
798 atqueue = queue = *optarg;
799 if (!(islower(queue)||isupper(queue)))
806 warnx("-d is deprecated; use -r instead");
807 /* fall through to 'r' */
820 timer = ttime(optarg);
848 /* end of options eating
851 /* select our program
853 if(!check_permission())
854 errx(EXIT_FAILURE, "you do not have permission to use this program");
858 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
861 joblist = get_job_list(argc - optind, argv + optind, &joblen);
862 list_jobs(joblist, joblen);
867 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
869 process_jobs(argc, argv, ATRM);
874 process_jobs(argc, argv, CAT);
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.
883 timer = parsetime(argc, argv);
887 struct tm *tm = localtime(&timer);
888 fprintf(stderr, "%s\n", asctime(tm));
890 writefile(timer, queue);
895 queue = toupper(queue);
897 queue = DEFAULT_BATCH_QUEUE;
900 timer = parsetime(argc, argv);
906 struct tm *tm = localtime(&timer);
907 fprintf(stderr, "%s\n", asctime(tm));
910 writefile(timer, queue);
914 panic("internal error");