136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/* ufopen.c
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Open a file with the permissions of the invoking user.
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Copyright (C) 1992, 1995 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
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*/
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#include "uucp.h"
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#include "uudefs.h"
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#include "sysdep.h"
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#include "system.h"
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#include <errno.h>
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#else
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#if HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#define O_WRONLY 1
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#define O_RDWR 2
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#endif
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#ifndef O_NOCTTY
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#define O_NOCTTY 0
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#endif
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#ifndef FD_CLOEXEC
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#define FD_CLOEXEC 1
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#endif
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/* Open a file with the permissions of the invoking user. Ignore the
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fbinary argument since Unix has no distinction between text and
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binary files. */
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/*ARGSUSED*/
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openfile_t
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esysdep_user_fopen (zfile, frd, fbinary)
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const char *zfile;
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boolean frd;
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boolean fbinary;
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{
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uid_t ieuid;
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openfile_t e;
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const char *zerr;
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int o = 0;
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if (! fsuser_perms (&ieuid))
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return EFILECLOSED;
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zerr = NULL;
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#if USE_STDIO
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e = fopen (zfile, frd ? "r" : "w");
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if (e == NULL)
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zerr = "fopen";
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else
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o = fileno (e);
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#else
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if (frd)
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{
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e = open ((char *) zfile, O_RDONLY | O_NOCTTY, 0);
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zerr = "open";
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}
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else
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{
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e = creat ((char *) zfile, IPUBLIC_FILE_MODE);
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zerr = "creat";
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}
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if (e >= 0)
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{
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o = e;
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zerr = NULL;
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}
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#endif
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if (! fsuucp_perms ((long) ieuid))
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{
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if (ffileisopen (e))
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(void) ffileclose (e);
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return EFILECLOSED;
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}
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if (zerr != NULL)
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{
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ulog (LOG_ERROR, "%s (%s): %s", zerr, zfile, strerror (errno));
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#if ! HAVE_SETREUID
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/* Are these error messages helpful or confusing? */
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#if HAVE_SAVED_SETUID
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if (errno == EACCES && getuid () == 0)
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ulog (LOG_ERROR,
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"The superuser may only transfer files that are readable by %s",
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OWNER);
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#else
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if (errno == EACCES)
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ulog (LOG_ERROR,
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"You may only transfer files that are readable by %s", OWNER);
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#endif
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#endif /* ! HAVE_SETREUID */
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return EFILECLOSED;
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}
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if (fcntl (o, F_SETFD, fcntl (o, F_GETFD, 0) | FD_CLOEXEC) < 0)
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{
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ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
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(void) ffileclose (e);
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return EFILECLOSED;
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}
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return e;
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}
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