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.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
64 #include "parsetime.h"
73 #define ATJOB_DIR "/usr/spool/atjobs/"
77 #define LFILE ATJOB_DIR ".lockfile"
84 #define ALARMC 10 /* Number of seconds to wait for timeout */
89 enum { ATQ, ATRM, AT, BATCH, CAT }; /* what program we want to run */
91 /* File scope variables */
93 const char *no_export[] =
95 "TERM", "TERMCAP", "DISPLAY", "_"
97 static int send_mail = 0;
99 /* External variables */
101 extern char **environ;
103 char atfile[] = ATJOB_DIR "12345678901234";
105 char *atinput = (char*)0; /* where to get input from */
106 char atqueue = 0; /* which queue to examine for jobs (atq) */
107 char atverify = 0; /* verify time instead of queuing job */
110 /* Function declarations */
112 static void sigc(int signo);
113 static void alarmc(int signo);
114 static char *cwdname(void);
115 static void writefile(time_t runtimer, char queue);
116 static void list_jobs(long *, int);
117 static long nextjob(void);
118 static time_t ttime(const char *arg);
119 static int in_job_list(long, long *, int);
120 static long *get_job_list(int, char *[], int *);
122 /* Signal catching functions */
124 static void sigc(int signo __unused)
126 /* If the user presses ^C, remove the spool file and exit
138 static void alarmc(int signo __unused)
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));
149 /* Local functions */
151 static char *cwdname(void)
153 /* Read in the current directory; the name will be overwritten on
156 static char *ptr = NULL;
157 static size_t size = SIZE;
160 if ((ptr = malloc(size)) == NULL)
161 errx(EXIT_FAILURE, "virtual memory exhausted");
166 panic("out of memory");
168 if (getcwd(ptr, size-1) != NULL)
172 perr("cannot get directory");
176 if ((ptr = malloc(size)) == NULL)
177 errx(EXIT_FAILURE, "virtual memory exhausted");
187 if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != NULL) {
188 if (fscanf(fid, "%5lx", &jobno) == 1) {
190 jobno = (1+jobno) % 0xfffff; /* 2^20 jobs enough? */
191 fprintf(fid, "%05lx\n", jobno);
198 else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != NULL) {
199 fprintf(fid, "%05lx\n", jobno = 1);
207 writefile(time_t runtimer, char queue)
209 /* This does most of the work if at or batch are invoked for writing a job.
212 char *ap, *ppos, *mailname;
213 struct passwd *pass_entry;
215 int fdes, lockdes, fd2;
217 struct sigaction act;
224 (void) 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 ppos = atfile + strlen(ATJOB_DIR);
238 /* Loop over all possible file names for running something at this
239 * particular time, see if a file is there; the first empty slot at any
240 * particular time is used. Lock the file LFILE first to make sure
241 * we're alone when doing this.
246 if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
247 perr("cannot open lockfile " LFILE);
249 lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
252 act.sa_handler = alarmc;
253 sigemptyset(&(act.sa_mask));
256 /* Set an alarm so a timeout occurs after ALARMC seconds, in case
257 * something is seriously broken.
259 sigaction(SIGALRM, &act, NULL);
261 fcntl(lockdes, F_SETLKW, &lock);
264 if ((jobno = nextjob()) == EOF)
265 perr("cannot generate job number");
267 sprintf(ppos, "%c%5lx%8lx", queue,
268 jobno, (unsigned long) (runtimer/60));
270 for(ap=ppos; *ap != '\0'; ap ++)
274 if (stat(atfile, &statbuf) != 0)
276 perr("cannot access " ATJOB_DIR);
278 /* Create the file. The x bit is only going to be set after it has
279 * been completely written out, to make sure it is not executed in the
280 * meantime. To make sure they do not get deleted, turn off their r
281 * bit. Yes, this is a kluge.
283 cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
284 if ((fdes = creat(atfile, O_WRONLY)) == -1)
285 perr("cannot create atjob file");
287 if ((fd2 = dup(fdes)) <0)
288 perr("error in dup() of job file");
290 if(fchown(fd2, real_uid, real_gid) != 0)
291 perr("cannot give away file");
295 /* We no longer need suid root; now we just need to be able to write
296 * to the directory, if necessary.
299 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
301 /* We've successfully created the file; let's set the flag so it
302 * gets removed in case of an interrupt or error.
306 /* Now we can release the lock, so other people can access it
308 lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; lock.l_start = 0;
310 fcntl(lockdes, F_SETLKW, &lock);
313 if((fp = fdopen(fdes, "w")) == NULL)
314 panic("cannot reopen atjob file");
316 /* Get the userid to mail to, first by trying getlogin(),
317 * then from LOGNAME, finally from getpwuid().
319 mailname = getlogin();
320 if (mailname == NULL)
321 mailname = getenv("LOGNAME");
323 if ((mailname == NULL) || (mailname[0] == '\0')
324 || (strlen(mailname) >= MAXLOGNAME) || (getpwnam(mailname)==NULL))
326 pass_entry = getpwuid(real_uid);
327 if (pass_entry != NULL)
328 mailname = pass_entry->pw_name;
331 if (atinput != (char *) NULL)
333 fpin = freopen(atinput, "r", stdin);
335 perr("cannot open input file");
337 fprintf(fp, "#!/bin/sh\n# atrun uid=%ld gid=%ld\n# mail %*s %d\n",
338 (long) real_uid, (long) real_gid, MAXLOGNAME - 1, mailname,
341 /* Write out the umask at the time of invocation
343 fprintf(fp, "umask %lo\n", (unsigned long) cmask);
345 /* Write out the environment. Anything that may look like a
346 * special character to the shell is quoted, except for \n, which is
347 * done with a pair of "'s. Don't export the no_export list (such
348 * as TERM or DISPLAY) because we don't want these.
350 for (atenv= environ; *atenv != NULL; atenv++)
355 eqp = strchr(*atenv, '=');
361 for (i=0; i<sizeof(no_export)/sizeof(no_export[0]); i++)
364 && (strncmp(*atenv, no_export[i],
365 (size_t) (eqp-*atenv)) != 0);
372 (void)fputs("export ", fp);
373 fwrite(*atenv, sizeof(char), eqp-*atenv, fp);
374 for(ap = eqp;*ap != '\0'; ap++)
377 fprintf(fp, "\"\n\"");
382 case '%': case '/': case '{': case '[':
383 case ']': case '=': case '}': case '@':
384 case '+': case '#': case ',': case '.':
385 case ':': case '-': case '_':
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");
440 fprintf(stderr, "Job %ld will be executed using /bin/sh\n", jobno);
444 in_job_list(long job, long *joblist, int len)
448 for (i = 0; i < len; i++)
449 if (job == joblist[i])
456 list_jobs(long *joblist, int len)
458 /* List all a user's jobs in the queue, by looping through ATJOB_DIR,
459 * or everybody's if we are root
463 struct dirent *dirent;
470 char timestr[TIMESIZE];
474 (void) setlocale(LC_TIME, "");
479 if (chdir(ATJOB_DIR) != 0)
480 perr("cannot change to " ATJOB_DIR);
482 if ((spool = opendir(".")) == NULL)
483 perr("cannot open " ATJOB_DIR);
485 /* Loop over every file in the directory
487 while((dirent = readdir(spool)) != NULL) {
488 if (stat(dirent->d_name, &buf) != 0)
489 perr("cannot stat in " ATJOB_DIR);
491 /* See it's a regular file and has its x bit turned on and
494 if (!S_ISREG(buf.st_mode)
495 || ((buf.st_uid != real_uid) && ! (real_uid == 0))
496 || !(S_IXUSR & buf.st_mode || atverify))
499 if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
502 /* If jobs are given, only list those jobs */
503 if (joblist && !in_job_list(jobno, joblist, len))
506 if (atqueue && (queue != atqueue))
509 runtimer = 60*(time_t) ctm;
510 runtime = *localtime(&runtimer);
511 strftime(timestr, TIMESIZE, "%+", &runtime);
513 printf("Date\t\t\t\tOwner\t\tQueue\tJob#\n");
516 pw = getpwuid(buf.st_uid);
518 printf("%s\t%-16s%c%s\t%ld\n",
520 pw ? pw->pw_name : "???",
522 (S_IXUSR & buf.st_mode) ? "":"(done)",
530 process_jobs(int argc, char **argv, int what)
532 /* Delete every argument (job - ID) given
541 struct dirent *dirent;
546 nofJobs = argc - optind;
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 rc = stat(dirent->d_name, &buf);
567 /* There's a race condition between readdir above and stat here:
568 * another atrm process could have removed the file from the spool
569 * directory under our nose. If this happens, stat will set errno to
570 * ENOENT, which we shouldn't treat as fatal.
573 if (statErrno == ENOENT)
576 perr("cannot stat in " ATJOB_DIR);
579 if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
582 for (i=optind; i < argc; i++) {
583 if (atoi(argv[i]) == jobno) {
584 if ((buf.st_uid != real_uid) && !(real_uid == 0))
585 errx(EXIT_FAILURE, "%s: not owner", argv[i]);
591 if (unlink(dirent->d_name) != 0)
592 perr(dirent->d_name);
605 fp = fopen(dirent->d_name,"r");
610 perr("cannot open file");
612 while((ch = getc(fp)) != EOF) {
620 errx(EXIT_FAILURE, "internal error, process_jobs = %d",
624 /* All arguments have been processed
626 if (++nofDone == nofJobs)
635 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
638 ttime(const char *arg)
641 * This is pretty much a copy of stime_arg1() from touch.c. I changed
642 * the return value and the argument list because it's more convenient
643 * (IMO) to do everything in one place. - Joe Halpin
645 struct timeval tv[2];
651 if (gettimeofday(&tv[0], NULL))
652 panic("Cannot get current time");
654 /* Start with the current time. */
656 if ((t = localtime(&now)) == NULL)
658 /* [[CC]YY]MMDDhhmm[.SS] */
659 if ((p = strchr(arg, '.')) == NULL)
660 t->tm_sec = 0; /* Seconds defaults to 0. */
662 if (strlen(p + 1) != 2)
665 t->tm_sec = ATOI2(p);
669 switch(strlen(arg)) {
670 case 12: /* CCYYMMDDhhmm */
671 t->tm_year = ATOI2(arg);
675 case 10: /* YYMMDDhhmm */
677 yearset = ATOI2(arg);
678 t->tm_year += yearset;
680 yearset = ATOI2(arg);
681 t->tm_year = yearset + 2000;
683 t->tm_year -= 1900; /* Convert to UNIX time. */
685 case 8: /* MMDDhhmm */
686 t->tm_mon = ATOI2(arg);
687 --t->tm_mon; /* Convert from 01-12 to 00-11 */
688 t->tm_mday = ATOI2(arg);
689 t->tm_hour = ATOI2(arg);
690 t->tm_min = ATOI2(arg);
696 t->tm_isdst = -1; /* Figure out DST. */
697 tv[0].tv_sec = tv[1].tv_sec = mktime(t);
698 if (tv[0].tv_sec != -1)
703 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
707 get_job_list(int argc, char *argv[], int *joblen)
716 if ((joblist = malloc(len * sizeof(*joblist))) == NULL)
717 panic("out of memory");
719 for (i = 0; i < argc; i++) {
721 if ((joblist[i] = strtol(argv[i], &ep, 10)) < 0 ||
722 ep == argv[i] || *ep != '\0' || errno)
723 panic("invalid job number");
732 main(int argc, char **argv)
735 char queue = DEFAULT_AT_QUEUE;
739 int program = AT; /* our default program */
740 const char *options = "q:f:t:rmvldbc"; /* default options for at */
750 /* Eat any leading paths
752 if ((pgm = strrchr(argv[0], '/')) == NULL)
759 /* find out what this program is supposed to do
761 if (strcmp(pgm, "atq") == 0) {
765 else if (strcmp(pgm, "atrm") == 0) {
769 else if (strcmp(pgm, "batch") == 0) {
774 /* process whatever options we can process
777 while ((c=getopt(argc, argv, options)) != -1)
779 case 'v': /* verify time settings */
783 case 'm': /* send mail when job is complete */
791 case 'q': /* specify queue */
792 if (strlen(optarg) > 1)
795 atqueue = queue = *optarg;
796 if (!(islower(queue)||isupper(queue)))
803 warnx("-d is deprecated; use -r instead");
804 /* fall through to 'r' */
817 timer = ttime(optarg);
845 /* end of options eating
848 /* select our program
850 if(!check_permission())
851 errx(EXIT_FAILURE, "you do not have permission to use this program");
855 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
858 joblist = get_job_list(argc - optind, argv + optind, &joblen);
859 list_jobs(joblist, joblen);
864 REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
866 process_jobs(argc, argv, ATRM);
871 process_jobs(argc, argv, CAT);
876 * If timer is > -1, then the user gave the time with -t. In that
877 * case, it's already been set. If not, set it now.
880 timer = parsetime(argc, argv);
884 struct tm *tm = localtime(&timer);
885 fprintf(stderr, "%s\n", asctime(tm));
887 writefile(timer, queue);
892 queue = toupper(queue);
894 queue = DEFAULT_BATCH_QUEUE;
897 timer = parsetime(argc, argv);
903 struct tm *tm = localtime(&timer);
904 fprintf(stderr, "%s\n", asctime(tm));
907 writefile(timer, queue);
911 panic("internal error");