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/* ufopen.c
Open a file with the permissions of the invoking user.
Copyright (C) 1992, 1995 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 "sysdep.h"
#include "system.h"
#include <errno.h>
#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
/* Open a file with the permissions of the invoking user. Ignore the
fbinary argument since Unix has no distinction between text and
binary files. */
/*ARGSUSED*/
openfile_t
esysdep_user_fopen (zfile, frd, fbinary)
const char *zfile;
boolean frd;
boolean fbinary;
{
uid_t ieuid;
openfile_t e;
const char *zerr;
int o = 0;
if (! fsuser_perms (&ieuid))
return EFILECLOSED;
zerr = NULL;
#if USE_STDIO
e = fopen (zfile, frd ? "r" : "w");
if (e == NULL)
zerr = "fopen";
else
o = fileno (e);
#else
if (frd)
{
e = open ((char *) zfile, O_RDONLY | O_NOCTTY, 0);
zerr = "open";
}
else
{
e = creat ((char *) zfile, IPUBLIC_FILE_MODE);
zerr = "creat";
}
if (e >= 0)
{
o = e;
zerr = NULL;
}
#endif
if (! fsuucp_perms ((long) ieuid))
{
if (ffileisopen (e))
(void) ffileclose (e);
return EFILECLOSED;
}
if (zerr != NULL)
{
ulog (LOG_ERROR, "%s (%s): %s", zerr, zfile, strerror (errno));
#if ! HAVE_SETREUID
/* Are these error messages helpful or confusing? */
#if HAVE_SAVED_SETUID
if (errno == EACCES && getuid () == 0)
ulog (LOG_ERROR,
"The superuser may only transfer files that are readable by %s",
OWNER);
#else
if (errno == EACCES)
ulog (LOG_ERROR,
"You may only transfer files that are readable by %s", OWNER);
#endif
#endif /* ! HAVE_SETREUID */
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) ffileclose (e);
return EFILECLOSED;
}
return e;
}
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