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/* opensr.c
Open files for sending and receiving.
Copyright (C) 1991, 1992, 1993 Ian Lance Taylor
This file is part of the Taylor UUCP package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139.
*/
#include "uucp.h"
#include "uudefs.h"
#include "uuconf.h"
#include "system.h"
#include "sysdep.h"
#include <errno.h>
#if HAVE_TIME_H
#include <time.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#else
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#define O_WRONLY 1
#define O_RDWR 2
#endif
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
#ifndef FD_CLOEXEC
#define FD_CLOEXEC 1
#endif
#ifndef time
extern time_t time ();
#endif
/* Open a file to send to another system, and return the mode and
the size. */
openfile_t
esysdep_open_send (qsys, zfile, fcheck, zuser)
const struct uuconf_system *qsys;
const char *zfile;
boolean fcheck;
const char *zuser;
{
struct stat s;
openfile_t e;
int o;
if (fsysdep_directory (zfile))
{
ulog (LOG_ERROR, "%s: is a directory", zfile);
return EFILECLOSED;
}
#if USE_STDIO
e = fopen (zfile, BINREAD);
if (e == NULL)
{
ulog (LOG_ERROR, "fopen (%s): %s", zfile, strerror (errno));
return NULL;
}
o = fileno (e);
#else
e = open ((char *) zfile, O_RDONLY | O_NOCTTY, 0);
if (e == -1)
{
ulog (LOG_ERROR, "open (%s): %s", zfile, strerror (errno));
return -1;
}
o = e;
#endif
if (fcntl (o, F_SETFD, fcntl (o, F_GETFD, 0) | FD_CLOEXEC) < 0)
{
ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
(void) ffileclose (e);
return EFILECLOSED;
}
if (fstat (o, &s) == -1)
{
ulog (LOG_ERROR, "fstat: %s", strerror (errno));
s.st_mode = 0666;
}
/* We have to recheck the file permission, although we probably
checked it already, because otherwise there would be a window in
which somebody could change the contents of a symbolic link to
point to some file which was only readable by uucp. */
if (fcheck)
{
if (! fsuser_access (&s, R_OK, zuser))
{
ulog (LOG_ERROR, "%s: %s", zfile, strerror (EACCES));
(void) ffileclose (e);
return EFILECLOSED;
}
}
return e;
}
/* Get a temporary file name to receive into. We use the ztemp
argument to pick the file name, so that we restart the file if the
transmission is aborted. */
char *
zsysdep_receive_temp (qsys, zto, ztemp, frestart)
const struct uuconf_system *qsys;
const char *zto;
const char *ztemp;
boolean frestart;
{
if (frestart
&& ztemp != NULL
&& *ztemp == 'D'
&& strcmp (ztemp, "D.0") != 0)
return zsappend3 (".Temp", qsys->uuconf_zname, ztemp);
else
return zstemp_file (qsys);
}
/* The number of seconds in one week. We must cast to long for this
to be calculated correctly on a machine with 16 bit ints. */
#define SECS_PER_WEEK ((long) 7 * (long) 24 * (long) 60 * (long) 60)
/* Open a temporary file to receive into. This should, perhaps, check
that we have write permission on the receiving directory, but it
doesn't. */
openfile_t
esysdep_open_receive (qsys, zto, ztemp, zreceive, pcrestart)
const struct uuconf_system *qsys;
const char *zto;
const char *ztemp;
const char *zreceive;
long *pcrestart;
{
int o;
openfile_t e;
/* If we used the ztemp argument in zsysdep_receive_temp, above,
then we will have a name consistent across conversations. In
that case, we may have already received some portion of this
file. */
o = -1;
if (pcrestart != NULL)
*pcrestart = -1;
if (pcrestart != NULL
&& ztemp != NULL
&& *ztemp == 'D'
&& strcmp (ztemp, "D.0") != 0)
{
o = open ((char *) zreceive, O_WRONLY);
if (o >= 0)
{
struct stat s;
/* For safety, we insist on the file being less than 1 week
old. This can still catch people, unfortunately. I
don't know of any good solution to the problem of old
files hanging around. If anybody has a file they want
restarted, and they know about this issue, they can touch
it to bring it up to date. */
if (fstat (o, &s) < 0
|| s.st_mtime + SECS_PER_WEEK < time ((time_t *) NULL))
{
(void) close (o);
o = -1;
}
else
{
DEBUG_MESSAGE1 (DEBUG_SPOOLDIR,
"esysdep_open_receive: Reusing %s",
zreceive);
*pcrestart = (long) s.st_size;
}
}
}
if (o < 0)
o = creat ((char *) zreceive, IPRIVATE_FILE_MODE);
if (o < 0)
{
if (errno == ENOENT)
{
if (! fsysdep_make_dirs (zreceive, FALSE))
return EFILECLOSED;
o = creat ((char *) zreceive, IPRIVATE_FILE_MODE);
}
if (o < 0)
{
ulog (LOG_ERROR, "creat (%s): %s", zreceive, strerror (errno));
return EFILECLOSED;
}
}
if (fcntl (o, F_SETFD, fcntl (o, F_GETFD, 0) | FD_CLOEXEC) < 0)
{
ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
(void) close (o);
(void) remove (zreceive);
return EFILECLOSED;
}
#if USE_STDIO
e = fdopen (o, (char *) BINWRITE);
if (e == NULL)
{
ulog (LOG_ERROR, "fdopen (%s): %s", zreceive, strerror (errno));
(void) close (o);
(void) remove (zreceive);
return EFILECLOSED;
}
#else
e = o;
#endif
return e;
}
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