2 * at.c : Put file into atrun queue
4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
6 * Copyright (C) 1993, 1994 Thomas Koenig
8 * Atrun & Atq modifications
9 * Copyright (C) 1993 David Parsons
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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
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.
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
67 #include "parsetime.h"
76 #define ATJOB_DIR "/usr/spool/atjobs/"
80 #define LFILE ATJOB_DIR ".lockfile"
87 #define ALARMC 10 /* Number of seconds to wait for timeout */
92 enum { ATQ, ATRM, AT, BATCH, CAT }; /* what program we want to run */
94 /* File scope variables */
96 static const char *no_export[] = {
97 "TERM", "TERMCAP", "DISPLAY", "_"
99 static int send_mail = 0;
100 static char *atinput = NULL; /* where to get input from */
101 static char atqueue = 0; /* which queue to examine for jobs (atq) */
103 /* External variables */
105 extern char **environ;
107 char atfile[] = ATJOB_DIR "12345678901234";
108 char atverify = 0; /* verify time instead of queuing job */
111 /* Function declarations */
113 static void sigc(int signo);
114 static void alarmc(int signo);
115 static char *cwdname(void);
116 static void writefile(time_t runtimer, char queue);
117 static void list_jobs(long *, int);
118 static long nextjob(void);
119 static time_t ttime(const char *arg);
120 static int in_job_list(long, long *, int);
121 static long *get_job_list(int, char *[], int *);
123 /* Signal catching functions */
125 static void sigc(int signo __unused)
127 /* If the user presses ^C, remove the spool file and exit
139 static void 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 */
152 static char *cwdname(void)
154 /* Read in the current directory; the name will be overwritten on
157 static char *ptr = NULL;
158 static size_t size = SIZE;
161 if ((ptr = malloc(size)) == NULL)
162 errx(EXIT_FAILURE, "virtual memory exhausted");
167 panic("out of memory");
169 if (getcwd(ptr, size-1) != NULL)
173 perr("cannot get directory");
177 if ((ptr = malloc(size)) == NULL)
178 errx(EXIT_FAILURE, "virtual memory exhausted");
188 if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
189 if (fscanf(fid, "%5lx", &jobno) == 1) {
191 jobno = (1+jobno) % 0xfffff; /* 2^20 jobs enough? */
192 fprintf(fid, "%05lx\n", jobno);
199 else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
200 fprintf(fid, "%05lx\n", jobno = 1);
208 writefile(time_t runtimer, char queue)
210 /* This does most of the work if at or batch are invoked for writing a job.
213 char *ap, *ppos, *mailname;
214 struct passwd *pass_entry;
216 int fdes, lockdes, fd2;
218 struct sigaction act;
225 (void) setlocale(LC_TIME, "");
228 /* Install the signal handler for SIGINT; terminate after removing the
229 * spool file if necessary
231 act.sa_handler = sigc;
232 sigemptyset(&(act.sa_mask));
235 sigaction(SIGINT, &act, NULL);
237 ppos = atfile + strlen(ATJOB_DIR);
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.
247 if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
248 perr("cannot open lockfile " LFILE);
250 lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
253 act.sa_handler = alarmc;
254 sigemptyset(&(act.sa_mask));
257 /* Set an alarm so a timeout occurs after ALARMC seconds, in case
258 * something is seriously broken.
260 sigaction(SIGALRM, &act, NULL);
262 fcntl(lockdes, F_SETLKW, &lock);
265 if ((jobno = nextjob()) == EOF)
266 perr("cannot generate job number");
268 sprintf(ppos, "%c%5lx%8lx", queue,
269 jobno, (unsigned long) (runtimer/60));
271 for(ap=ppos; *ap != '\0'; ap ++)
275 if (stat(atfile, &statbuf) != 0)
277 perr("cannot access " ATJOB_DIR);
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.
284 cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
285 if ((fdes = creat(atfile, O_WRONLY)) == -1)
286 perr("cannot create atjob file");
288 if ((fd2 = dup(fdes)) <0)
289 perr("error in dup() of job file");
291 if(fchown(fd2, real_uid, real_gid) != 0)
292 perr("cannot give away file");
296 /* We no longer need suid root; now we just need to be able to write
297 * to the directory, if necessary.
300 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
302 /* We've successfully created the file; let's set the flag so it
303 * gets removed in case of an interrupt or error.
307 /* Now we can release the lock, so other people can access it
309 lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
311 fcntl(lockdes, F_SETLKW, &lock);
314 if((fp = fdopen(fdes, "w")) == NULL)
315 panic("cannot reopen atjob file");
317 /* Get the userid to mail to, first by trying getlogin(),
318 * then from LOGNAME, finally from getpwuid().
320 mailname = getlogin();
321 if (mailname == NULL)
322 mailname = getenv("LOGNAME");
324 if ((mailname == NULL) || (mailname[0] == '\0')
325 || (strlen(mailname) >= MAXLOGNAME) || (getpwnam(mailname)==NULL))
327 pass_entry = getpwuid(real_uid);
328 if (pass_entry != NULL)
329 mailname = pass_entry->pw_name;
332 if (atinput != (char *) NULL)
334 fpin = freopen(atinput, "r", stdin);
336 perr("cannot open input file");
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,
342 /* Write out the umask at the time of invocation
344 fprintf(fp, "umask %lo\n", (unsigned long) cmask);
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.
351 for (atenv= environ; *atenv != NULL; atenv++)
356 eqp = strchr(*atenv, '=');
362 for (i = 0; i < nitems(no_export); i++)
365 && (strncmp(*atenv, no_export[i],
366 (size_t) (eqp-*atenv)) != 0);
373 (void)fputs("export ", fp);
374 fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
375 for(ap = eqp;*ap != '\0'; ap++)
378 fprintf(fp, "\"\n\"");
383 case '%': case '/': case '{': case '[':
384 case ']': case '=': case '}': case '@':
385 case '+': case '#': case ',': case '.':
386 case ':': case '-': case '_':
400 /* Cd to the directory at the time and write out all the
401 * commands the user supplies from stdin.
404 for (ap = cwdname(); *ap != '\0'; ap++)
407 fprintf(fp, "\"\n\"");
410 if (*ap != '/' && !isalnum(*ap))
416 /* Test cd's exit status: die if the original directory has been
417 * removed, become unreadable or whatever
419 fprintf(fp, " || {\n\t echo 'Execution directory "
420 "inaccessible' >&2\n\t exit 1\n}\n");
422 while((ch = getchar()) != EOF)
427 panic("output error");
430 panic("input error");
434 /* Set the x bit so that we're ready to start executing
437 if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
438 perr("cannot give away file");
441 fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
445 in_job_list(long job, long *joblist, int len)
449 for (i = 0; i < len; i++)
450 if (job == joblist[i])
457 list_jobs(long *joblist, int len)
459 /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
460 * or everybody's if we are root
464 struct dirent *dirent;
471 char timestr[TIMESIZE];
475 (void) setlocale(LC_TIME, "");
480 if (chdir(ATJOB_DIR) != 0)
481 perr("cannot change to " ATJOB_DIR);
483 if ((spool = opendir(".")) == NULL)
484 perr("cannot open " ATJOB_DIR);
486 /* Loop over every file in the directory
488 while((dirent = readdir(spool)) != NULL) {
489 if (stat(dirent->d_name, &buf) != 0)
490 perr("cannot stat in " ATJOB_DIR);
492 /* See it's a regular file and has its x bit turned on and
495 if (!S_ISREG(buf.st_mode)
496 || ((buf.st_uid != real_uid) && ! (real_uid == 0))
497 || !(S_IXUSR & buf.st_mode || atverify))
500 if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
503 /* If jobs are given, only list those jobs */
504 if (joblist && !in_job_list(jobno, joblist, len))
507 if (atqueue && (queue != atqueue))
510 runtimer = 60*(time_t) ctm;
511 runtime = *localtime(&runtimer);
512 strftime(timestr, TIMESIZE, "%+", &runtime);
514 printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
517 pw = getpwuid(buf.st_uid);
519 printf("%s\t%-16s%c%s\t%ld\n",
521 pw ? pw->pw_name : "???",
523 (S_IXUSR & buf.st_mode) ? "":"(done)",
531 process_jobs(int argc, char **argv, int what)
533 /* Delete every argument (job - ID) given
542 struct dirent *dirent;
547 nofJobs = argc - optind;
552 if (chdir(ATJOB_DIR) != 0)
553 perr("cannot change to " ATJOB_DIR);
555 if ((spool = opendir(".")) == NULL)
556 perr("cannot open " ATJOB_DIR);
560 /* Loop over every file in the directory
562 while((dirent = readdir(spool)) != NULL) {
565 rc = stat(dirent->d_name, &buf);
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.
574 if (statErrno == ENOENT)
577 perr("cannot stat in " ATJOB_DIR);
580 if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
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]);
592 if (unlink(dirent->d_name) != 0)
593 perr(dirent->d_name);
606 fp = fopen(dirent->d_name,"r");
611 perr("cannot open file");
613 while((ch = getc(fp)) != EOF) {
621 errx(EXIT_FAILURE, "internal error, process_jobs = %d",
625 /* All arguments have been processed
627 if (++nofDone == nofJobs)
636 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
639 ttime(const char *arg)
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
646 struct timeval tv[2];
652 if (gettimeofday(&tv[0], NULL))
653 panic("Cannot get current time");
655 /* Start with the current time. */
657 if ((t = localtime(&now)) == NULL)
659 /* [[CC]YY]MMDDhhmm[.SS] */
660 if ((p = strchr(arg, '.')) == NULL)
661 t->tm_sec = 0; /* Seconds defaults to 0. */
663 if (strlen(p + 1) != 2)
666 t->tm_sec = ATOI2(p);
670 switch(strlen(arg)) {
671 case 12: /* CCYYMMDDhhmm */
672 t->tm_year = ATOI2(arg);
676 case 10: /* YYMMDDhhmm */
678 yearset = ATOI2(arg);
679 t->tm_year += yearset;
681 yearset = ATOI2(arg);
682 t->tm_year = yearset + 2000;
684 t->tm_year -= 1900; /* Convert to UNIX time. */
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);
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)
704 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
708 get_job_list(int argc, char *argv[], int *joblen)
717 if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
718 panic("out of memory");
720 for (i = 0; i < argc; i++) {
722 if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
723 ep == argv[i] || *ep != '\0' || errno)
724 panic("invalid job number");
733 main(int argc, char **argv)
736 char queue = DEFAULT_AT_QUEUE;
740 int program = AT; /* our default program */
741 const char *options = "q:f:t:rmvldbc"; /* default options for at */
751 /* Eat any leading paths
753 if ((pgm = strrchr(argv[0], '/')) == NULL)
760 /* find out what this program is supposed to do
762 if (strcmp(pgm, "atq") == 0) {
766 else if (strcmp(pgm, "atrm") == 0) {
770 else if (strcmp(pgm, "batch") == 0) {
775 /* process whatever options we can process
778 while ((c=getopt(argc, argv, options)) != -1)
780 case 'v': /* verify time settings */
784 case 'm': /* send mail when job is complete */
792 case 'q': /* specify queue */
793 if (strlen(optarg) > 1)
796 atqueue = queue = *optarg;
797 if (!(islower(queue)||isupper(queue)))
804 warnx("-d is deprecated; use -r instead");
805 /* fall through to 'r' */
818 timer = ttime(optarg);
846 /* end of options eating
849 /* select our program
851 if(!check_permission())
852 errx(EXIT_FAILURE, "you do not have permission to use this program");
856 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
859 joblist = get_job_list(argc - optind, argv + optind, &joblen);
860 list_jobs(joblist, joblen);
865 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
867 process_jobs(argc, argv, ATRM);
872 process_jobs(argc, argv, CAT);
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.
881 timer = parsetime(argc, argv);
885 struct tm *tm = localtime(&timer);
886 fprintf(stderr, "%s\n", asctime(tm));
888 writefile(timer, queue);
893 queue = toupper(queue);
895 queue = DEFAULT_BATCH_QUEUE;
898 timer = parsetime(argc, argv);
904 struct tm *tm = localtime(&timer);
905 fprintf(stderr, "%s\n", asctime(tm));
908 writefile(timer, queue);
912 panic("internal error");