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![Werner Koch](/assets/img/avatar_default.png)
-- We need to use es_fopen on Windows to cope with non-ascii file names. This is quite a large but fortunately straightforward change. At a very few places we keep using stdio (for example due to the use of popen). GnuPG-bug-id: 5098 Signed-off-by: Werner Koch <wk@gnupg.org>
191 lines
4.5 KiB
C
191 lines
4.5 KiB
C
/* keybox-file.c - File operations
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* Copyright (C) 2001, 2003 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include "keybox-defs.h"
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#define IMAGELEN_LIMIT (5*1024*1024)
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#if !defined(HAVE_FTELLO) && !defined(ftello)
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static off_t
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ftello (FILE *stream)
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{
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long int off;
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off = ftell (stream);
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if (off == -1)
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return (off_t)-1;
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return off;
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}
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#endif /* !defined(HAVE_FTELLO) && !defined(ftello) */
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/* Read a block at the current position and return it in R_BLOB.
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R_BLOB may be NULL to simply skip the current block. */
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int
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_keybox_read_blob (KEYBOXBLOB *r_blob, estream_t fp, int *skipped_deleted)
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{
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unsigned char *image;
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size_t imagelen = 0;
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int c1, c2, c3, c4, type;
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int rc;
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off_t off;
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if (skipped_deleted)
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*skipped_deleted = 0;
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again:
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if (r_blob)
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*r_blob = NULL;
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off = es_ftello (fp);
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if (off == (off_t)-1)
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return gpg_error_from_syserror ();
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if ((c1 = es_getc (fp)) == EOF
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|| (c2 = es_getc (fp)) == EOF
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|| (c3 = es_getc (fp)) == EOF
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|| (c4 = es_getc (fp)) == EOF
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|| (type = es_getc (fp)) == EOF)
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{
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if ( c1 == EOF && !es_ferror (fp) )
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return -1; /* eof */
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if (!es_ferror (fp))
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return gpg_error (GPG_ERR_TOO_SHORT);
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return gpg_error_from_syserror ();
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}
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imagelen = ((unsigned int) c1 << 24) | (c2 << 16) | (c3 << 8 ) | c4;
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if (imagelen < 5)
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return gpg_error (GPG_ERR_TOO_SHORT);
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if (!type)
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{
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/* Special treatment for empty blobs. */
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if (es_fseek (fp, imagelen-5, SEEK_CUR))
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return gpg_error_from_syserror ();
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if (skipped_deleted)
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*skipped_deleted = 1;
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goto again;
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}
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if (imagelen > IMAGELEN_LIMIT) /* Sanity check. */
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{
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/* Seek forward so that the caller may choose to ignore this
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record. */
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if (es_fseek (fp, imagelen-5, SEEK_CUR))
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return gpg_error_from_syserror ();
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return gpg_error (GPG_ERR_TOO_LARGE);
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}
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if (!r_blob)
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{
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/* This blob shall be skipped. */
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if (es_fseek (fp, imagelen-5, SEEK_CUR))
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return gpg_error_from_syserror ();
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return 0;
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}
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image = xtrymalloc (imagelen);
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if (!image)
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return gpg_error_from_syserror ();
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image[0] = c1; image[1] = c2; image[2] = c3; image[3] = c4; image[4] = type;
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if (es_fread (image+5, imagelen-5, 1, fp) != 1)
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{
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gpg_error_t tmperr = gpg_error_from_syserror ();
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xfree (image);
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return tmperr;
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}
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rc = _keybox_new_blob (r_blob, image, imagelen, off);
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if (rc)
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xfree (image);
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return rc;
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}
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/* Write the block to the current file position */
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int
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_keybox_write_blob (KEYBOXBLOB blob, estream_t fp, FILE *outfp)
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{
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const unsigned char *image;
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size_t length;
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image = _keybox_get_blob_image (blob, &length);
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if (length > IMAGELEN_LIMIT)
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return gpg_error (GPG_ERR_TOO_LARGE);
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if (fp)
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{
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if (es_fwrite (image, length, 1, fp) != 1)
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return gpg_error_from_syserror ();
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}
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else
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{
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if (fwrite (image, length, 1, outfp) != 1)
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return gpg_error_from_syserror ();
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}
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return 0;
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}
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/* Write a fresh header type blob. */
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gpg_error_t
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_keybox_write_header_blob (estream_t fp, int for_openpgp)
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{
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unsigned char image[32];
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u32 val;
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memset (image, 0, sizeof image);
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/* Length of this blob. */
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image[3] = 32;
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image[4] = KEYBOX_BLOBTYPE_HEADER;
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image[5] = 1; /* Version */
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if (for_openpgp)
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image[7] = 0x02; /* OpenPGP data may be available. */
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memcpy (image+8, "KBXf", 4);
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val = time (NULL);
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/* created_at and last maintenance run. */
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image[16] = (val >> 24);
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image[16+1] = (val >> 16);
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image[16+2] = (val >> 8);
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image[16+3] = (val );
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image[20] = (val >> 24);
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image[20+1] = (val >> 16);
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image[20+2] = (val >> 8);
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image[20+3] = (val );
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if (es_fwrite (image, 32, 1, fp) != 1)
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return gpg_error_from_syserror ();
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return 0;
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}
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