2015121deb
<sys/stat.h> for the declaration of struct timeval (sys/stat.h> only needs timespecs even when its POSIX support is not turned on, so it shouldn't declare timevals). Fixed some #include messes.
847 lines
18 KiB
C
847 lines
18 KiB
C
/*
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* at.c : Put file into atrun queue
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* Copyright (C) 1993, 1994 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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*
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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(S) 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define _USE_BSD 1
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/* System Headers */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.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 <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifndef __FreeBSD__
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#include <getopt.h>
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#endif
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#ifdef __FreeBSD__
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#include <locale.h>
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#endif
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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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#include <utmp.h>
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#if (MAXLOGNAME-1) > UT_NAMESIZE
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#define LOGNAMESIZE UT_NAMESIZE
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#else
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#define LOGNAMESIZE (MAXLOGNAME-1)
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#endif
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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 "perm.h"
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#define MAIN
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#include "privs.h"
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/* Macros */
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#ifndef ATJOB_DIR
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#define ATJOB_DIR "/usr/spool/atjobs/"
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#endif
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#ifndef LFILE
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#define LFILE ATJOB_DIR ".lockfile"
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#endif
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#ifndef ATJOB_MX
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#define ATJOB_MX 255
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#endif
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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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enum { ATQ, ATRM, AT, BATCH, CAT }; /* what program we want to run */
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/* File scope variables */
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const char *no_export[] =
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{
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"TERM", "TERMCAP", "DISPLAY", "_"
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} ;
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static int 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 atfile[] = ATJOB_DIR "12345678901234";
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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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char *namep;
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/* Function declarations */
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static void sigc(int signo);
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static void alarmc(int signo);
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static char *cwdname(void);
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static void writefile(time_t runtimer, char queue);
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static void list_jobs(void);
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static long nextjob(void);
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static time_t ttime(const char *arg);
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/* Signal catching functions */
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static void sigc(int signo __unused)
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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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{
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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 alarmc(int signo __unused)
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{
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char buf[1024];
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/* Time out after some seconds. */
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strlcpy(buf, namep, sizeof(buf));
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strlcat(buf, ": file locking timed out\n", sizeof(buf));
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write(STDERR_FILENO, buf, strlen(buf));
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sigc(0);
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}
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/* Local functions */
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static char *cwdname(void)
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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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if ((ptr = malloc(size)) == NULL)
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errx(EXIT_FAILURE, "virtual memory exhausted");
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while (1)
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{
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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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if ((ptr = malloc(size)) == NULL)
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errx(EXIT_FAILURE, "virtual memory exhausted");
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}
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}
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static long
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nextjob()
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{
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long jobno;
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FILE *fid;
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if ((fid = fopen(ATJOB_DIR ".SEQ", "r+")) != (FILE*)0) {
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if (fscanf(fid, "%5lx", &jobno) == 1) {
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rewind(fid);
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jobno = (1+jobno) % 0xfffff; /* 2^20 jobs enough? */
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fprintf(fid, "%05lx\n", jobno);
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}
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else
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jobno = EOF;
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fclose(fid);
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return jobno;
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}
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else if ((fid = fopen(ATJOB_DIR ".SEQ", "w")) != (FILE*)0) {
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fprintf(fid, "%05lx\n", jobno = 1);
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fclose(fid);
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return 1;
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}
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return EOF;
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}
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static void
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writefile(time_t runtimer, char queue)
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{
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/* This does most of the work if at or batch are invoked for writing a job.
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*/
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long jobno;
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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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#ifdef __FreeBSD__
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(void) setlocale(LC_TIME, "");
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#endif
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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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ppos = atfile + strlen(ATJOB_DIR);
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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 any
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* particular time is used. Lock the file LFILE first to make sure
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* we're alone when doing this.
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*/
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PRIV_START
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if ((lockdes = open(LFILE, O_WRONLY | O_CREAT, S_IWUSR | S_IRUSR)) < 0)
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perr("cannot open lockfile " LFILE);
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lock.l_type = F_WRLCK; lock.l_whence = SEEK_SET; 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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/* 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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if ((jobno = nextjob()) == EOF)
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perr("cannot generate job number");
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sprintf(ppos, "%c%5lx%8lx", queue,
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jobno, (unsigned long) (runtimer/60));
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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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perr("cannot access " ATJOB_DIR);
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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 the
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* meantime. To make sure they do not get deleted, turn off their r
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* 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, real_gid) != 0)
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perr("cannot give away file");
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PRIV_END
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/* We no longer need suid root; now we just need to be able to write
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* to the directory, if necessary.
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*/
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REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
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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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*/
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lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; 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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/* Get the userid to mail to, first by trying getlogin(), which reads
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* /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) > LOGNAMESIZE) || (getpwnam(mailname)==NULL))
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{
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pass_entry = getpwuid(real_uid);
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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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{
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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# atrun uid=%ld gid=%ld\n# mail %*s %d\n",
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(long) real_uid, (long) real_gid, LOGNAMESIZE, mailname, send_mail);
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/* Write out the umask at the time of invocation
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*/
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fprintf(fp, "umask %lo\n", (unsigned long) cmask);
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/* Write out the environment. Anything that may look like a
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* special character to the shell is quoted, except for \n, which is
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* done with a pair of "'s. Don't export the no_export list (such
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* as 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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{
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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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{
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size_t i;
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for (i=0; i<sizeof(no_export)/sizeof(no_export[0]); i++)
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{
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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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{
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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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{
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if (*ap == '\n')
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fprintf(fp, "\"\n\"");
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else
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{
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if (!isalnum(*ap)) {
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switch (*ap) {
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case '%': case '/': case '{': case '[':
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case ']': case '=': case '}': case '@':
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case '+': case '#': case ',': case '.':
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case ':': case '-': case '_':
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break;
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default:
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fputc('\\', fp);
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break;
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}
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}
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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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/* Cd to the directory at the time and write out all the
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* commands the user supplies from stdin.
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*/
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fprintf(fp, "cd ");
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for (ap = cwdname(); *ap != '\0'; ap++)
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{
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if (*ap == '\n')
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fprintf(fp, "\"\n\"");
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else
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{
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if (*ap != '/' && !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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/* Test cd's exit status: die if the original directory has been
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* removed, become unreadable or whatever
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*/
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fprintf(fp, " || {\n\t echo 'Execution directory "
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"inaccessible' >&2\n\t exit 1\n}\n");
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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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/* 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 %ld will be executed using /bin/sh\n", jobno);
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}
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static void
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list_jobs()
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{
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/* List all a user's jobs in the queue, by looping through ATJOB_DIR,
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* 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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long jobno;
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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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#ifdef __FreeBSD__
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(void) setlocale(LC_TIME, "");
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#endif
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PRIV_START
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if (chdir(ATJOB_DIR) != 0)
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perr("cannot change to " ATJOB_DIR);
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if ((spool = opendir(".")) == NULL)
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perr("cannot open " ATJOB_DIR);
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/* Loop over every file in the directory
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*/
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while((dirent = readdir(spool)) != NULL) {
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if (stat(dirent->d_name, &buf) != 0)
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perr("cannot stat in " ATJOB_DIR);
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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%5lx%8lx", &queue, &jobno, &ctm)!=3)
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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, "%+", &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%ld\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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jobno);
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}
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PRIV_END
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}
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static void
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process_jobs(int argc, char **argv, int what)
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{
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/* Delete every argument (job - ID) given
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*/
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int i;
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struct stat buf;
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DIR *spool;
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struct dirent *dirent;
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unsigned long ctm;
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char queue;
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long jobno;
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PRIV_START
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if (chdir(ATJOB_DIR) != 0)
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perr("cannot change to " ATJOB_DIR);
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if ((spool = opendir(".")) == NULL)
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perr("cannot open " ATJOB_DIR);
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PRIV_END
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/* Loop over every file in the directory
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*/
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while((dirent = readdir(spool)) != NULL) {
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PRIV_START
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if (stat(dirent->d_name, &buf) != 0)
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perr("cannot stat in " ATJOB_DIR);
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PRIV_END
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|
|
if(sscanf(dirent->d_name, "%c%5lx%8lx", &queue, &jobno, &ctm)!=3)
|
|
continue;
|
|
|
|
for (i=optind; i < argc; i++) {
|
|
if (atoi(argv[i]) == jobno) {
|
|
if ((buf.st_uid != real_uid) && !(real_uid == 0))
|
|
errx(EXIT_FAILURE, "%s: not owner", argv[i]);
|
|
switch (what) {
|
|
case ATRM:
|
|
|
|
PRIV_START
|
|
|
|
if (unlink(dirent->d_name) != 0)
|
|
perr(dirent->d_name);
|
|
|
|
PRIV_END
|
|
|
|
break;
|
|
|
|
case CAT:
|
|
{
|
|
FILE *fp;
|
|
int ch;
|
|
|
|
PRIV_START
|
|
|
|
fp = fopen(dirent->d_name,"r");
|
|
|
|
PRIV_END
|
|
|
|
if (!fp) {
|
|
perr("cannot open file");
|
|
}
|
|
while((ch = getc(fp)) != EOF) {
|
|
putchar(ch);
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
errx(EXIT_FAILURE, "internal error, process_jobs = %d",
|
|
what);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} /* delete_jobs */
|
|
|
|
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
|
|
|
|
static time_t
|
|
ttime(const char *arg)
|
|
{
|
|
/*
|
|
* This is pretty much a copy of stime_arg1() from touch.c. I changed
|
|
* the return value and the argument list because it's more convenient
|
|
* (IMO) to do everything in one place. - Joe Halpin
|
|
*/
|
|
struct timeval tv[2];
|
|
time_t now;
|
|
struct tm *t;
|
|
int yearset;
|
|
char *p;
|
|
|
|
if (gettimeofday(&tv[0], NULL))
|
|
panic("Cannot get current time");
|
|
|
|
/* Start with the current time. */
|
|
now = tv[0].tv_sec;
|
|
if ((t = localtime(&now)) == NULL)
|
|
panic("localtime");
|
|
/* [[CC]YY]MMDDhhmm[.SS] */
|
|
if ((p = strchr(arg, '.')) == NULL)
|
|
t->tm_sec = 0; /* Seconds defaults to 0. */
|
|
else {
|
|
if (strlen(p + 1) != 2)
|
|
goto terr;
|
|
*p++ = '\0';
|
|
t->tm_sec = ATOI2(p);
|
|
}
|
|
|
|
yearset = 0;
|
|
switch(strlen(arg)) {
|
|
case 12: /* CCYYMMDDhhmm */
|
|
t->tm_year = ATOI2(arg);
|
|
t->tm_year *= 100;
|
|
yearset = 1;
|
|
/* FALLTHROUGH */
|
|
case 10: /* YYMMDDhhmm */
|
|
if (yearset) {
|
|
yearset = ATOI2(arg);
|
|
t->tm_year += yearset;
|
|
} else {
|
|
yearset = ATOI2(arg);
|
|
t->tm_year = yearset + 2000;
|
|
}
|
|
t->tm_year -= 1900; /* Convert to UNIX time. */
|
|
/* FALLTHROUGH */
|
|
case 8: /* MMDDhhmm */
|
|
t->tm_mon = ATOI2(arg);
|
|
--t->tm_mon; /* Convert from 01-12 to 00-11 */
|
|
t->tm_mday = ATOI2(arg);
|
|
t->tm_hour = ATOI2(arg);
|
|
t->tm_min = ATOI2(arg);
|
|
break;
|
|
default:
|
|
goto terr;
|
|
}
|
|
|
|
t->tm_isdst = -1; /* Figure out DST. */
|
|
tv[0].tv_sec = tv[1].tv_sec = mktime(t);
|
|
if (tv[0].tv_sec != -1)
|
|
return tv[0].tv_sec;
|
|
else
|
|
terr:
|
|
panic(
|
|
"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int c;
|
|
char queue = DEFAULT_AT_QUEUE;
|
|
char queue_set = 0;
|
|
char *pgm;
|
|
|
|
int program = AT; /* our default program */
|
|
const char *options = "q:f:t:rmvldbc"; /* default options for at */
|
|
time_t timer;
|
|
|
|
timer = -1;
|
|
RELINQUISH_PRIVS
|
|
|
|
/* Eat any leading paths
|
|
*/
|
|
if ((pgm = strrchr(argv[0], '/')) == NULL)
|
|
pgm = argv[0];
|
|
else
|
|
pgm++;
|
|
|
|
namep = pgm;
|
|
|
|
/* find out what this program is supposed to do
|
|
*/
|
|
if (strcmp(pgm, "atq") == 0) {
|
|
program = ATQ;
|
|
options = "q:v";
|
|
}
|
|
else if (strcmp(pgm, "atrm") == 0) {
|
|
program = ATRM;
|
|
options = "";
|
|
}
|
|
else if (strcmp(pgm, "batch") == 0) {
|
|
program = BATCH;
|
|
options = "f:q:mv";
|
|
}
|
|
|
|
/* process whatever options we can process
|
|
*/
|
|
opterr=1;
|
|
while ((c=getopt(argc, argv, options)) != -1)
|
|
switch (c) {
|
|
case 'v': /* verify time settings */
|
|
atverify = 1;
|
|
break;
|
|
|
|
case 'm': /* send mail when job is complete */
|
|
send_mail = 1;
|
|
break;
|
|
|
|
case 'f':
|
|
atinput = optarg;
|
|
break;
|
|
|
|
case 'q': /* specify queue */
|
|
if (strlen(optarg) > 1)
|
|
usage();
|
|
|
|
atqueue = queue = *optarg;
|
|
if (!(islower(queue)||isupper(queue)))
|
|
usage();
|
|
|
|
queue_set = 1;
|
|
break;
|
|
|
|
case 'd':
|
|
warnx("-d is deprecated; use -r instead");
|
|
/* fall through to 'r' */
|
|
|
|
case 'r':
|
|
if (program != AT)
|
|
usage();
|
|
|
|
program = ATRM;
|
|
options = "";
|
|
break;
|
|
|
|
case 't':
|
|
if (program != AT)
|
|
usage();
|
|
timer = ttime(optarg);
|
|
break;
|
|
|
|
case 'l':
|
|
if (program != AT)
|
|
usage();
|
|
|
|
program = ATQ;
|
|
options = "q:v";
|
|
break;
|
|
|
|
case 'b':
|
|
if (program != AT)
|
|
usage();
|
|
|
|
program = BATCH;
|
|
options = "f:q:mv";
|
|
break;
|
|
|
|
case 'c':
|
|
program = CAT;
|
|
options = "";
|
|
break;
|
|
|
|
default:
|
|
usage();
|
|
break;
|
|
}
|
|
/* end of options eating
|
|
*/
|
|
|
|
/* select our program
|
|
*/
|
|
if(!check_permission())
|
|
errx(EXIT_FAILURE, "you do not have permission to use this program");
|
|
switch (program) {
|
|
case ATQ:
|
|
|
|
REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
|
|
|
|
list_jobs();
|
|
break;
|
|
|
|
case ATRM:
|
|
|
|
REDUCE_PRIV(DAEMON_UID, DAEMON_GID)
|
|
|
|
process_jobs(argc, argv, ATRM);
|
|
break;
|
|
|
|
case CAT:
|
|
|
|
process_jobs(argc, argv, CAT);
|
|
break;
|
|
|
|
case AT:
|
|
/*
|
|
* If timer is > -1, then the user gave the time with -t. In that
|
|
* case, it's already been set. If not, set it now.
|
|
*/
|
|
if (timer == -1)
|
|
timer = parsetime(argc, argv);
|
|
|
|
if (atverify)
|
|
{
|
|
struct tm *tm = localtime(&timer);
|
|
fprintf(stderr, "%s\n", asctime(tm));
|
|
}
|
|
writefile(timer, queue);
|
|
break;
|
|
|
|
case BATCH:
|
|
if (queue_set)
|
|
queue = toupper(queue);
|
|
else
|
|
queue = DEFAULT_BATCH_QUEUE;
|
|
|
|
if (argc > optind)
|
|
timer = parsetime(argc, argv);
|
|
else
|
|
timer = time(NULL);
|
|
|
|
if (atverify)
|
|
{
|
|
struct tm *tm = localtime(&timer);
|
|
fprintf(stderr, "%s\n", asctime(tm));
|
|
}
|
|
|
|
writefile(timer, queue);
|
|
break;
|
|
|
|
default:
|
|
panic("internal error");
|
|
break;
|
|
}
|
|
exit(EXIT_SUCCESS);
|
|
}
|