563 lines
12 KiB
C
563 lines
12 KiB
C
/*
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* at.c : Put file into atrun queue
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* Copyright (C) 1993 Thomas Koenig
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*
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* Atrun & Atq modifications
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* Copyright (C) 1993 David Parsons
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the author(s) may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _USE_BSD 1
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/* System Headers */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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/* Local headers */
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#include "at.h"
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#include "panic.h"
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#include "parsetime.h"
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#include "pathnames.h"
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#define MAIN
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#include "privs.h"
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/* Macros */
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#define ALARMC 10 /* Number of seconds to wait for timeout */
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#define SIZE 255
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#define TIMESIZE 50
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/* File scope variables */
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static char rcsid[] = "$Id: at.c,v 1.2 1993/12/06 04:10:42 cgd Exp $";
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char *no_export[] =
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{
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"TERM", "TERMCAP", "DISPLAY", "_"
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};
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static send_mail = 0;
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/* External variables */
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extern char **environ;
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int fcreated;
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char *namep;
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char atfile[FILENAME_MAX];
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char *atinput = (char *) 0; /* where to get input from */
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char atqueue = 0; /* which queue to examine for jobs (atq) */
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char atverify = 0; /* verify time instead of queuing job */
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/* Function declarations */
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static void sigc __P((int signo));
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static void alarmc __P((int signo));
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static char *cwdname __P((void));
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static void writefile __P((time_t runtimer, char queue));
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static void list_jobs __P((void));
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/* Signal catching functions */
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static void
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sigc(signo)
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int signo;
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{
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/* If the user presses ^C, remove the spool file and exit
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*/
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if (fcreated) {
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PRIV_START
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unlink(atfile);
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PRIV_END
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}
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exit(EXIT_FAILURE);
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}
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static void
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alarmc(signo)
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int signo;
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{
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/* Time out after some seconds
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*/
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panic("File locking timed out");
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}
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/* Local functions */
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static char *
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cwdname()
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{
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/* Read in the current directory; the name will be overwritten on
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* subsequent calls.
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*/
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static char *ptr = NULL;
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static size_t size = SIZE;
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if (ptr == NULL)
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ptr = (char *) malloc(size);
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while (1) {
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if (ptr == NULL)
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panic("Out of memory");
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if (getcwd(ptr, size - 1) != NULL)
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return ptr;
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if (errno != ERANGE)
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perr("Cannot get directory");
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free(ptr);
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size += SIZE;
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ptr = (char *) malloc(size);
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}
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}
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static void
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writefile(runtimer, queue)
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time_t runtimer;
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char queue;
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{
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/*
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* This does most of the work if at or batch are invoked for
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* writing a job.
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*/
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int i;
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char *ap, *ppos, *mailname;
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struct passwd *pass_entry;
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struct stat statbuf;
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int fdes, lockdes, fd2;
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FILE *fp, *fpin;
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struct sigaction act;
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char **atenv;
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int ch;
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mode_t cmask;
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struct flock lock;
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/*
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* Install the signal handler for SIGINT; terminate after removing the
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* spool file if necessary
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*/
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act.sa_handler = sigc;
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sigemptyset(&(act.sa_mask));
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act.sa_flags = 0;
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sigaction(SIGINT, &act, NULL);
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strcpy(atfile, _PATH_ATJOBS);
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ppos = atfile + strlen(_PATH_ATJOBS);
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/*
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* Loop over all possible file names for running something at this
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* particular time, see if a file is there; the first empty slot at
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* any particular time is used. Lock the file _PATH_LOCKFILE first
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* to make sure we're alone when doing this.
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*/
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PRIV_START
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if ((lockdes = open(_PATH_LOCKFILE, O_WRONLY | O_CREAT, 0600)) < 0)
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perr2("Cannot open lockfile ", _PATH_LOCKFILE);
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = 0;
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lock.l_len = 0;
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act.sa_handler = alarmc;
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sigemptyset(&(act.sa_mask));
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act.sa_flags = 0;
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/*
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* Set an alarm so a timeout occurs after ALARMC seconds, in case
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* something is seriously broken.
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*/
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sigaction(SIGALRM, &act, NULL);
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alarm(ALARMC);
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fcntl(lockdes, F_SETLKW, &lock);
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alarm(0);
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for (i = 0; i < AT_MAXJOBS; i++) {
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sprintf(ppos, "%c%8lx.%3x", queue,
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(unsigned long) (runtimer / 60), i);
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for (ap = ppos; *ap != '\0'; ap++)
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if (*ap == ' ')
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*ap = '0';
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if (stat(atfile, &statbuf) != 0) {
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if (errno == ENOENT)
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break;
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else
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perr2("Cannot access ", _PATH_ATJOBS);
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}
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} /* for */
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if (i >= AT_MAXJOBS)
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panic("Too many jobs already");
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/*
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* Create the file. The x bit is only going to be set after it has
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* been completely written out, to make sure it is not executed in
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* the meantime. To make sure they do not get deleted, turn off
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* their r bit. Yes, this is a kluge.
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*/
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cmask = umask(S_IRUSR | S_IWUSR | S_IXUSR);
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if ((fdes = creat(atfile, O_WRONLY)) == -1)
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perr("Cannot create atjob file");
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if ((fd2 = dup(fdes)) < 0)
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perr("Error in dup() of job file");
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if (fchown(fd2, real_uid, -1) != 0)
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perr("Cannot give away file");
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PRIV_END
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/*
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* We no longer need suid root; now we just need to be able to
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* write to the directory, if necessary.
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*/
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REDUCE_PRIV(0);
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/*
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* We've successfully created the file; let's set the flag so it
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* gets removed in case of an interrupt or error.
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*/
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fcreated = 1;
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/* Now we can release the lock, so other people can access it */
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lock.l_type = F_UNLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = 0;
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lock.l_len = 0;
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fcntl(lockdes, F_SETLKW, &lock);
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close(lockdes);
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if ((fp = fdopen(fdes, "w")) == NULL)
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panic("Cannot reopen atjob file");
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/*
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* Get the userid to mail to, first by trying getlogin(), which
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* reads /etc/utmp, then from LOGNAME, finally from getpwuid().
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*/
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mailname = getlogin();
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if (mailname == NULL)
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mailname = getenv("LOGNAME");
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if ((mailname == NULL) || (mailname[0] == '\0')
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|| (strlen(mailname) > 8)) {
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pass_entry = getpwuid(getuid());
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if (pass_entry != NULL)
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mailname = pass_entry->pw_name;
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}
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if (atinput != (char *) NULL) {
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fpin = freopen(atinput, "r", stdin);
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if (fpin == NULL)
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perr("Cannot open input file");
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}
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fprintf(fp, "#! /bin/sh\n# mail %8s %d\n", mailname, send_mail);
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/* Write out the umask at the time of invocation */
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fprintf(fp, "umask %lo\n", (unsigned long) cmask);
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/*
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* Write out the environment. Anything that may look like a special
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* character to the shell is quoted, except for \n, which is done
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* with a pair of "'s. Dont't export the no_export list (such as
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* TERM or DISPLAY) because we don't want these.
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*/
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for (atenv = environ; *atenv != NULL; atenv++) {
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int export = 1;
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char *eqp;
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eqp = strchr(*atenv, '=');
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if (ap == NULL)
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eqp = *atenv;
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else {
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int i;
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for (i = 0;i < sizeof(no_export) /
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sizeof(no_export[0]); i++) {
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export = export
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&& (strncmp(*atenv, no_export[i],
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(size_t) (eqp - *atenv)) != 0);
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}
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eqp++;
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}
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if (export) {
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fwrite(*atenv, sizeof(char), eqp - *atenv, fp);
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for (ap = eqp; *ap != '\0'; ap++) {
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if (*ap == '\n')
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fprintf(fp, "\"\n\"");
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else {
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if (!isalnum(*ap))
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fputc('\\', fp);
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fputc(*ap, fp);
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}
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}
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fputs("; export ", fp);
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fwrite(*atenv, sizeof(char), eqp - *atenv - 1, fp);
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fputc('\n', fp);
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}
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}
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/*
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* Cd to the directory at the time and write out all the commands
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* the user supplies from stdin.
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*/
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fprintf(fp, "cd %s\n", cwdname());
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while ((ch = getchar()) != EOF)
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fputc(ch, fp);
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fprintf(fp, "\n");
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if (ferror(fp))
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panic("Output error");
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if (ferror(stdin))
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panic("Input error");
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fclose(fp);
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/*
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* Set the x bit so that we're ready to start executing
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*/
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if (fchmod(fd2, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
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perr("Cannot give away file");
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close(fd2);
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fprintf(stderr, "Job %s will be executed using /bin/sh\n", ppos);
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}
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static void
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list_jobs()
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{
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/*
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* List all a user's jobs in the queue, by looping through
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* _PATH_ATJOBS, or everybody's if we are root
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*/
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struct passwd *pw;
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DIR *spool;
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struct dirent *dirent;
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struct stat buf;
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struct tm runtime;
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unsigned long ctm;
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char queue;
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time_t runtimer;
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char timestr[TIMESIZE];
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int first = 1;
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PRIV_START
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if (chdir(_PATH_ATJOBS) != 0)
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perr2("Cannot change to ", _PATH_ATJOBS);
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if ((spool = opendir(".")) == NULL)
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perr2("Cannot open ", _PATH_ATJOBS);
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/* Loop over every file in the directory */
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while ((dirent = readdir(spool)) != NULL) {
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if (stat(dirent->d_name, &buf) != 0)
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perr2("Cannot stat in ", _PATH_ATJOBS);
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/*
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* See it's a regular file and has its x bit turned on and
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* is the user's
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*/
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if (!S_ISREG(buf.st_mode)
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|| ((buf.st_uid != real_uid) && !(real_uid == 0))
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|| !(S_IXUSR & buf.st_mode || atverify))
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continue;
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if (sscanf(dirent->d_name, "%c%8lx", &queue, &ctm) != 2)
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continue;
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if (atqueue && (queue != atqueue))
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continue;
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runtimer = 60 * (time_t) ctm;
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runtime = *localtime(&runtimer);
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strftime(timestr, TIMESIZE, "%X %x", &runtime);
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if (first) {
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printf("Date\t\t\tOwner\tQueue\tJob#\n");
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first = 0;
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}
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pw = getpwuid(buf.st_uid);
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printf("%s\t%s\t%c%s\t%s\n",
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timestr,
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pw ? pw->pw_name : "???",
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queue,
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(S_IXUSR & buf.st_mode) ? "" : "(done)",
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dirent->d_name);
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}
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PRIV_END
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}
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static void
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delete_jobs(argc, argv)
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int argc;
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char **argv;
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{
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/* Delete every argument (job - ID) given */
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int i;
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struct stat buf;
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PRIV_START
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if (chdir(_PATH_ATJOBS) != 0)
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perr2("Cannot change to ", _PATH_ATJOBS);
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for (i = optind; i < argc; i++) {
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if (stat(argv[i], &buf) != 0)
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perr(argv[i]);
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if ((buf.st_uid != real_uid) && !(real_uid == 0)) {
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fprintf(stderr, "%s: Not owner\n", argv[i]);
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exit(EXIT_FAILURE);
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}
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if (unlink(argv[i]) != 0)
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perr(argv[i]);
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}
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PRIV_END
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} /* delete_jobs */
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/* Global functions */
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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int c;
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char queue = 'a';
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char *pgm;
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enum {
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ATQ, ATRM, AT, BATCH
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}; /* what program we want to run */
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int program = AT; /* our default program */
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char *options = "q:f:mv"; /* default options for at */
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time_t timer;
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RELINQUISH_PRIVS
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/* Eat any leading paths */
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if ((pgm = strrchr(argv[0], '/')) == NULL)
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pgm = argv[0];
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else
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pgm++;
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namep = pgm;
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/* find out what this program is supposed to do */
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if (strcmp(pgm, "atq") == 0) {
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program = ATQ;
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options = "q:v";
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} else if (strcmp(pgm, "atrm") == 0) {
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program = ATRM;
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options = "";
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} else if (strcmp(pgm, "batch") == 0) {
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program = BATCH;
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options = "f:mv";
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}
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/* process whatever options we can process */
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opterr = 1;
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while ((c = getopt(argc, argv, options)) != EOF)
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switch (c) {
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case 'v': /* verify time settings */
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atverify = 1;
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break;
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case 'm': /* send mail when job is complete */
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send_mail = 1;
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break;
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case 'f':
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atinput = optarg;
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break;
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case 'q': /* specify queue */
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if (strlen(optarg) > 1)
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usage();
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atqueue = queue = *optarg;
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if ((!islower(queue)) || (queue > 'l'))
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usage();
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break;
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default:
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usage();
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break;
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}
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/* end of options eating */
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/* select our program */
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switch (program) {
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case ATQ:
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REDUCE_PRIV(0);
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list_jobs();
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break;
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case ATRM:
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REDUCE_PRIV(0);
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delete_jobs(argc, argv);
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break;
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case AT:
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timer = parsetime(argc, argv);
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if (atverify) {
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struct tm *tm = localtime(&timer);
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fprintf(stderr, "%s\n", asctime(tm));
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}
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writefile(timer, queue);
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break;
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case BATCH:
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writefile(time(NULL), 'b');
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break;
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default:
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panic("Internal error");
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break;
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}
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exit(EXIT_SUCCESS);
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}
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