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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- The author of the program may be contacted at ian@airs.com or
- c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
- */
-
- #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;
- }
-