mirror of git://git.gnupg.org/gnupg.git
369 lines
7.6 KiB
C
369 lines
7.6 KiB
C
/* mdfilter.c - filter data and calculate a message digest
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* Copyright (C) 1998, 1999, 2000, 2001 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <npth.h>
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#include "gpg.h"
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#include "../common/status.h"
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#include "../common/iobuf.h"
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#include "../common/util.h"
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#include "filter.h"
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/****************
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* This filter is used to collect a message digest
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*/
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int
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md_filter( void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len)
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{
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size_t size = *ret_len;
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md_filter_context_t *mfx = opaque;
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int i, rc=0;
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if( control == IOBUFCTRL_UNDERFLOW ) {
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if( mfx->maxbuf_size && size > mfx->maxbuf_size )
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size = mfx->maxbuf_size;
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i = iobuf_read( a, buf, size );
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if( i == -1 ) i = 0;
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if( i ) {
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gcry_md_write(mfx->md, buf, i );
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if( mfx->md2 )
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gcry_md_write(mfx->md2, buf, i );
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}
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else
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rc = -1; /* eof */
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*ret_len = i;
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}
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else if( control == IOBUFCTRL_DESC )
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mem2str (buf, "md_filter", *ret_len);
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return rc;
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}
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void
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free_md_filter_context( md_filter_context_t *mfx )
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{
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gcry_md_close(mfx->md);
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gcry_md_close(mfx->md2);
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mfx->md = NULL;
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mfx->md2 = NULL;
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mfx->maxbuf_size = 0;
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}
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/****************
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* Threaded implementation for hashing.
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*/
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struct md_thd_filter_context {
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gcry_md_hd_t md;
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npth_t thd;
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/**/
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npth_mutex_t mutex;
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npth_cond_t cond;
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size_t bufsize;
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unsigned int produce : 1;
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unsigned int consume : 1;
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ssize_t written0;
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ssize_t written1;
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unsigned char buf[1];
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};
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static void
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lock_md (struct md_thd_filter_context *mfx)
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{
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int rc = npth_mutex_lock (&mfx->mutex);
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if (rc)
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log_fatal ("%s: failed to acquire mutex: %s\n", __func__,
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gpg_strerror (gpg_error_from_errno (rc)));
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}
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static void
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unlock_md (struct md_thd_filter_context * mfx)
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{
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int rc = npth_mutex_unlock (&mfx->mutex);
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if (rc)
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log_fatal ("%s: failed to release mutex: %s\n", __func__,
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gpg_strerror (gpg_error_from_errno (rc)));
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}
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static int
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get_buffer_to_hash (struct md_thd_filter_context *mfx,
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unsigned char **r_buf, size_t *r_len)
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{
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int rc = 0;
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lock_md (mfx);
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if ((mfx->consume == 0 && mfx->written0 < 0)
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|| (mfx->consume != 0 && mfx->written1 < 0))
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{
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rc = npth_cond_wait (&mfx->cond, &mfx->mutex);
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if (rc)
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{
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unlock_md (mfx);
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return -1;
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}
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}
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if (mfx->consume == 0)
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{
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*r_buf = mfx->buf;
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*r_len = mfx->written0;
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}
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else
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{
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*r_buf = mfx->buf + mfx->bufsize;
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*r_len = mfx->written1;
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}
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unlock_md (mfx);
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return 0;
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}
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static int
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put_buffer_to_recv (struct md_thd_filter_context *mfx)
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{
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int rc = 0;
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lock_md (mfx);
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if (mfx->consume == 0)
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{
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mfx->written0 = -1;
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mfx->consume = 1;
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}
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else
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{
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mfx->written1 = -1;
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mfx->consume = 0;
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}
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rc = npth_cond_signal (&mfx->cond);
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if (rc)
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{
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unlock_md (mfx);
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return -1;
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}
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unlock_md (mfx);
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return 0;
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}
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static int
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get_buffer_to_fill (struct md_thd_filter_context *mfx,
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unsigned char **r_buf, size_t len)
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{
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lock_md (mfx);
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if (len > mfx->bufsize)
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{
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unlock_md (mfx);
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return GPG_ERR_BUFFER_TOO_SHORT;
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}
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if ((mfx->produce == 0 && mfx->written0 >= 0)
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|| (mfx->produce != 0 && mfx->written1 >= 0))
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{
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int rc = npth_cond_wait (&mfx->cond, &mfx->mutex);
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if (rc)
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{
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unlock_md (mfx);
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return gpg_error_from_errno (rc);
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}
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}
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if (mfx->produce == 0)
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*r_buf = mfx->buf;
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else
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*r_buf = mfx->buf + mfx->bufsize;
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unlock_md (mfx);
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return 0;
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}
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static int
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put_buffer_to_send (struct md_thd_filter_context *mfx, size_t len)
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{
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int rc;
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lock_md (mfx);
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if (mfx->produce == 0)
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{
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mfx->written0 = len;
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mfx->produce = 1;
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}
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else
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{
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mfx->written1 = len;
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mfx->produce = 0;
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}
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rc = npth_cond_signal (&mfx->cond);
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if (rc)
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{
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unlock_md (mfx);
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return gpg_error_from_errno (rc);
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}
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unlock_md (mfx);
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/* Yield to the md_thread to let it compute the hash in parallel */
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npth_usleep (0);
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return 0;
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}
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static void *
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md_thread (void *arg)
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{
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struct md_thd_filter_context *mfx = arg;
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while (1)
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{
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unsigned char *buf;
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size_t len;
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if (get_buffer_to_hash (mfx, &buf, &len) < 0)
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/* Error */
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return NULL;
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if (len == 0)
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break;
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npth_unprotect ();
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gcry_md_write (mfx->md, buf, len);
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npth_protect ();
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if (put_buffer_to_recv (mfx) < 0)
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/* Error */
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return NULL;
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}
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return NULL;
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}
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int
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md_thd_filter (void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len)
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{
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size_t size = *ret_len;
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struct md_thd_filter_context **r_mfx = opaque;
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struct md_thd_filter_context *mfx = *r_mfx;
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int rc=0;
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if (control == IOBUFCTRL_INIT)
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{
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npth_attr_t tattr;
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size_t n;
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n = 2 * iobuf_set_buffer_size (0) * 1024;
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mfx = xtrymalloc (n + offsetof (struct md_thd_filter_context, buf));
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if (!mfx)
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return gpg_error_from_syserror ();
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*r_mfx = mfx;
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mfx->bufsize = n / 2;
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mfx->consume = mfx->produce = 0;
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mfx->written0 = -1;
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mfx->written1 = -1;
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rc = npth_mutex_init (&mfx->mutex, NULL);
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if (rc)
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{
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return gpg_error_from_errno (rc);
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}
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rc = npth_cond_init (&mfx->cond, NULL);
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if (rc)
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{
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npth_mutex_destroy (&mfx->mutex);
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return gpg_error_from_errno (rc);
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}
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rc = npth_attr_init (&tattr);
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if (rc)
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{
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npth_cond_destroy (&mfx->cond);
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npth_mutex_destroy (&mfx->mutex);
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return gpg_error_from_errno (rc);
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}
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npth_attr_setdetachstate (&tattr, NPTH_CREATE_JOINABLE);
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rc = npth_create (&mfx->thd, &tattr, md_thread, mfx);
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if (rc)
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{
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npth_cond_destroy (&mfx->cond);
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npth_mutex_destroy (&mfx->mutex);
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npth_attr_destroy (&tattr);
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return gpg_error_from_errno (rc);
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}
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npth_attr_destroy (&tattr);
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}
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else if (control == IOBUFCTRL_UNDERFLOW)
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{
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int i;
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unsigned char *md_buf = NULL;
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i = iobuf_read (a, buf, size);
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if (i == -1)
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i = 0;
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rc = get_buffer_to_fill (mfx, &md_buf, i);
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if (rc)
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return rc;
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if (i)
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memcpy (md_buf, buf, i);
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rc = put_buffer_to_send (mfx, i);
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if (rc)
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return rc;
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if (i == 0)
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{
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npth_join (mfx->thd, NULL);
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rc = -1; /* eof */
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}
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*ret_len = i;
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}
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else if (control == IOBUFCTRL_FREE)
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{
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npth_cond_destroy (&mfx->cond);
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npth_mutex_destroy (&mfx->mutex);
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xfree (mfx);
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*r_mfx = NULL;
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}
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else if (control == IOBUFCTRL_DESC)
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mem2str (buf, "md_thd_filter", *ret_len);
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return rc;
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}
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void
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md_thd_filter_set_md (struct md_thd_filter_context *mfx, gcry_md_hd_t md)
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{
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mfx->md = md;
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}
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