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mirror of git://git.gnupg.org/gnupg.git synced 2024-12-23 10:29:58 +01:00
gnupg/kbx/keybox-file.c
Werner Koch b008274afd Nuked almost all trailing white space.
We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces.  In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much.  For future commits the pre-commit scripts
checks that this won't happen again.
2011-02-04 12:57:53 +01:00

162 lines
3.8 KiB
C

/* keybox-file.c - File operations
* Copyright (C) 2001, 2003 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include "keybox-defs.h"
#if !defined(HAVE_FTELLO) && !defined(ftello)
static off_t
ftello (FILE *stream)
{
long int off;
off = ftell (stream);
if (off == -1)
return (off_t)-1;
return off;
}
#endif /* !defined(HAVE_FTELLO) && !defined(ftello) */
/* Read a block at the current postion and return it in r_blob.
r_blob may be NULL to simply skip the current block */
int
_keybox_read_blob2 (KEYBOXBLOB *r_blob, FILE *fp, int *skipped_deleted)
{
unsigned char *image;
size_t imagelen = 0;
int c1, c2, c3, c4, type;
int rc;
off_t off;
*skipped_deleted = 0;
again:
*r_blob = NULL;
off = ftello (fp);
if (off == (off_t)-1)
return gpg_error_from_syserror ();
if ((c1 = getc (fp)) == EOF
|| (c2 = getc (fp)) == EOF
|| (c3 = getc (fp)) == EOF
|| (c4 = getc (fp)) == EOF
|| (type = getc (fp)) == EOF)
{
if ( c1 == EOF && !ferror (fp) )
return -1; /* eof */
if (!ferror (fp))
return gpg_error (GPG_ERR_TOO_SHORT);
return gpg_error_from_syserror ();
}
imagelen = (c1 << 24) | (c2 << 16) | (c3 << 8 ) | c4;
if (imagelen > 500000) /* Sanity check. */
return gpg_error (GPG_ERR_TOO_LARGE);
if (imagelen < 5)
return gpg_error (GPG_ERR_TOO_SHORT);
if (!type)
{
/* Special treatment for empty blobs. */
if (fseek (fp, imagelen-5, SEEK_CUR))
return gpg_error_from_syserror ();
*skipped_deleted = 1;
goto again;
}
image = xtrymalloc (imagelen);
if (!image)
return gpg_error_from_syserror ();
image[0] = c1; image[1] = c2; image[2] = c3; image[3] = c4; image[4] = type;
if (fread (image+5, imagelen-5, 1, fp) != 1)
{
gpg_error_t tmperr = gpg_error_from_syserror ();
xfree (image);
return tmperr;
}
rc = r_blob? _keybox_new_blob (r_blob, image, imagelen, off) : 0;
if (rc || !r_blob)
xfree (image);
return rc;
}
int
_keybox_read_blob (KEYBOXBLOB *r_blob, FILE *fp)
{
int dummy;
return _keybox_read_blob2 (r_blob, fp, &dummy);
}
/* Write the block to the current file position */
int
_keybox_write_blob (KEYBOXBLOB blob, FILE *fp)
{
const unsigned char *image;
size_t length;
image = _keybox_get_blob_image (blob, &length);
if (fwrite (image, length, 1, fp) != 1)
return gpg_error_from_syserror ();
return 0;
}
/* Write a fresh header type blob. */
int
_keybox_write_header_blob (FILE *fp)
{
unsigned char image[32];
u32 val;
memset (image, 0, sizeof image);
/* Length of this blob. */
image[3] = 32;
image[4] = BLOBTYPE_HEADER;
image[5] = 1; /* Version */
memcpy (image+8, "KBXf", 4);
val = time (NULL);
/* created_at and last maintenance run. */
image[16] = (val >> 24);
image[16+1] = (val >> 16);
image[16+2] = (val >> 8);
image[16+3] = (val );
image[20] = (val >> 24);
image[20+1] = (val >> 16);
image[20+2] = (val >> 8);
image[20+3] = (val );
if (fwrite (image, 32, 1, fp) != 1)
return gpg_error_from_syserror ();
return 0;
}