mirror of
git://git.gnupg.org/gnupg.git
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483 lines
12 KiB
C
483 lines
12 KiB
C
/* plaintext.c - process plaintext packets
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003,
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* 2004 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 2 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, 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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*/
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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 <assert.h>
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#include <sys/types.h>
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#ifdef HAVE_DOSISH_SYSTEM
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#include <fcntl.h> /* for setmode() */
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#endif
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#include "util.h"
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#include "memory.h"
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#include "options.h"
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#include "packet.h"
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#include "ttyio.h"
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#include "filter.h"
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#include "main.h"
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#include "status.h"
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#include "i18n.h"
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/****************
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* Handle a plaintext packet. If MFX is not NULL, update the MDs
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* Note: we should use the filter stuff here, but we have to add some
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* easy mimic to set a read limit, so we calculate only the
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* bytes from the plaintext.
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*/
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int
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handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx,
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int nooutput, int clearsig )
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{
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char *fname = NULL;
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FILE *fp = NULL;
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static off_t count=0;
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int rc = 0;
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int c;
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int convert = (pt->mode == 't' || pt->mode == 'u');
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/* Let people know what the plaintext info is. This allows the
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receiving program to try and do something different based on
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the format code (say, recode UTF-8 to local). */
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if(!nooutput && is_status_enabled())
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{
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char status[20];
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sprintf(status,"%X %lu ",(byte)pt->mode,(ulong)pt->timestamp);
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write_status_text_and_buffer(STATUS_PLAINTEXT,
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status,pt->name,pt->namelen,0);
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if(!pt->is_partial)
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{
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sprintf(status,"%lu",(ulong)pt->len);
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write_status_text(STATUS_PLAINTEXT_LENGTH,status);
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}
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}
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/* create the filename as C string */
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if( nooutput )
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;
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else if( opt.outfile ) {
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fname = m_alloc( strlen( opt.outfile ) + 1);
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strcpy(fname, opt.outfile );
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}
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else if( pt->namelen == 8 && !memcmp( pt->name, "_CONSOLE", 8 ) ) {
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log_info(_("data not saved; use option \"--output\" to save it\n"));
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nooutput = 1;
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}
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else if( !opt.use_embedded_filename ) {
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fname = make_outfile_name( iobuf_get_real_fname(pt->buf) );
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if( !fname )
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fname = ask_outfile_name( pt->name, pt->namelen );
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if( !fname ) {
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rc = G10ERR_CREATE_FILE;
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goto leave;
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}
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}
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else {
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fname = make_printable_string( pt->name, pt->namelen, 0 );
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}
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if( nooutput )
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;
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else if( !*fname || (*fname=='-' && !fname[1])) {
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/* no filename or "-" given; write to stdout */
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fp = stdout;
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#ifdef HAVE_DOSISH_SYSTEM
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setmode ( fileno(fp) , O_BINARY );
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#endif
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}
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else {
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while( !overwrite_filep (fname) ) {
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char *tmp = ask_outfile_name (NULL, 0);
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if ( !tmp || !*tmp ) {
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m_free (tmp);
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rc = G10ERR_CREATE_FILE;
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goto leave;
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}
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m_free (fname);
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fname = tmp;
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}
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}
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if( fp || nooutput )
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;
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else if( !(fp = fopen(fname,"wb")) ) {
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log_error(_("error creating `%s': %s\n"), fname, strerror(errno) );
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rc = G10ERR_CREATE_FILE;
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#ifdef __riscos__
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if (errno == 106)
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log_info("perhaps the output file has the same name as the input file?\n");
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#endif /* __riscos__ */
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goto leave;
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}
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if( !pt->is_partial ) {
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/* we have an actual length (which might be zero). */
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assert( !clearsig );
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if( convert ) { /* text mode */
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for( ; pt->len; pt->len-- ) {
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if( (c = iobuf_get(pt->buf)) == -1 ) {
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log_error("Problem reading source (%u bytes remaining)\n",
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(unsigned)pt->len);
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rc = G10ERR_READ_FILE;
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goto leave;
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}
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if( mfx->md )
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md_putc(mfx->md, c );
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#ifndef HAVE_DOSISH_SYSTEM
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if( c == '\r' ) /* convert to native line ending */
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continue; /* fixme: this hack might be too simple */
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#endif
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if( fp )
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{
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if(opt.max_output && (++count)>opt.max_output)
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{
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log_error("Error writing to `%s': %s\n",
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fname,"exceeded --max-output limit\n");
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rc = G10ERR_WRITE_FILE;
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goto leave;
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}
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else if( putc( c, fp ) == EOF )
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{
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log_error("Error writing to `%s': %s\n",
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fname, strerror(errno) );
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rc = G10ERR_WRITE_FILE;
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goto leave;
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}
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}
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}
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}
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else { /* binary mode */
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byte *buffer = m_alloc( 32768 );
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while( pt->len ) {
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int len = pt->len > 32768 ? 32768 : pt->len;
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len = iobuf_read( pt->buf, buffer, len );
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if( len == -1 ) {
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log_error("Problem reading source (%u bytes remaining)\n",
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(unsigned)pt->len);
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rc = G10ERR_READ_FILE;
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m_free( buffer );
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goto leave;
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}
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if( mfx->md )
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md_write( mfx->md, buffer, len );
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if( fp )
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{
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if(opt.max_output && (count+=len)>opt.max_output)
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{
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log_error("Error writing to `%s': %s\n",
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fname,"exceeded --max-output limit\n");
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rc = G10ERR_WRITE_FILE;
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m_free( buffer );
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goto leave;
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}
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else if( fwrite( buffer, 1, len, fp ) != len )
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{
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log_error("Error writing to `%s': %s\n",
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fname, strerror(errno) );
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rc = G10ERR_WRITE_FILE;
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m_free( buffer );
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goto leave;
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}
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}
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pt->len -= len;
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}
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m_free( buffer );
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}
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}
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else if( !clearsig ) {
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if( convert ) { /* text mode */
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while( (c = iobuf_get(pt->buf)) != -1 ) {
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if( mfx->md )
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md_putc(mfx->md, c );
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#ifndef HAVE_DOSISH_SYSTEM
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if( convert && c == '\r' )
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continue; /* fixme: this hack might be too simple */
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#endif
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if( fp )
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{
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if(opt.max_output && (++count)>opt.max_output)
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{
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log_error("Error writing to `%s': %s\n",
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fname,"exceeded --max-output limit\n");
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rc = G10ERR_WRITE_FILE;
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goto leave;
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}
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else if( putc( c, fp ) == EOF )
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{
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log_error("Error writing to `%s': %s\n",
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fname, strerror(errno) );
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rc = G10ERR_WRITE_FILE;
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goto leave;
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}
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}
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}
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}
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else { /* binary mode */
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byte *buffer = m_alloc( 32768 );
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int eof;
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for( eof=0; !eof; ) {
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/* Why do we check for len < 32768:
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* If we won't, we would practically read 2 EOFs but
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* the first one has already popped the block_filter
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* off and therefore we don't catch the boundary.
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* So, always assume EOF if iobuf_read returns less bytes
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* then requested */
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int len = iobuf_read( pt->buf, buffer, 32768 );
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if( len == -1 )
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break;
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if( len < 32768 )
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eof = 1;
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if( mfx->md )
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md_write( mfx->md, buffer, len );
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if( fp )
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{
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if(opt.max_output && (count+=len)>opt.max_output)
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{
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log_error("Error writing to `%s': %s\n",
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fname,"exceeded --max-output limit\n");
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rc = G10ERR_WRITE_FILE;
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m_free( buffer );
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goto leave;
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}
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else if( fwrite( buffer, 1, len, fp ) != len ) {
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log_error("Error writing to `%s': %s\n",
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fname, strerror(errno) );
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rc = G10ERR_WRITE_FILE;
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m_free( buffer );
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goto leave;
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}
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}
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}
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m_free( buffer );
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}
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pt->buf = NULL;
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}
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else { /* clear text signature - don't hash the last cr,lf */
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int state = 0;
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while( (c = iobuf_get(pt->buf)) != -1 ) {
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if( fp )
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{
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if(opt.max_output && (++count)>opt.max_output)
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{
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log_error("Error writing to `%s': %s\n",
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fname,"exceeded --max-output limit\n");
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rc = G10ERR_WRITE_FILE;
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goto leave;
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}
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else if( putc( c, fp ) == EOF )
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{
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log_error("Error writing to `%s': %s\n",
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fname, strerror(errno) );
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rc = G10ERR_WRITE_FILE;
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goto leave;
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}
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}
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if( !mfx->md )
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continue;
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if( state == 2 ) {
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md_putc(mfx->md, '\r' );
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md_putc(mfx->md, '\n' );
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state = 0;
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}
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if( !state ) {
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if( c == '\r' )
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state = 1;
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else if( c == '\n' )
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state = 2;
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else
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md_putc(mfx->md, c );
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}
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else if( state == 1 ) {
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if( c == '\n' )
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state = 2;
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else {
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md_putc(mfx->md, '\r' );
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if( c == '\r' )
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state = 1;
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else {
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state = 0;
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md_putc(mfx->md, c );
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}
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}
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}
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}
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pt->buf = NULL;
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}
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if( fp && fp != stdout && fclose(fp) ) {
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log_error("Error closing `%s': %s\n", fname, strerror(errno) );
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fp = NULL;
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rc = G10ERR_WRITE_FILE;
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goto leave;
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}
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fp = NULL;
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leave:
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if( fp && fp != stdout )
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fclose(fp);
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m_free(fname);
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return rc;
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}
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static void
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do_hash( MD_HANDLE md, MD_HANDLE md2, IOBUF fp, int textmode )
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{
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text_filter_context_t tfx;
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int c;
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if( textmode ) {
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memset( &tfx, 0, sizeof tfx);
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iobuf_push_filter( fp, text_filter, &tfx );
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}
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if( md2 ) { /* work around a strange behaviour in pgp2 */
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/* It seems that at least PGP5 converts a single CR to a CR,LF too */
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int lc = -1;
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while( (c = iobuf_get(fp)) != -1 ) {
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if( c == '\n' && lc == '\r' )
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md_putc(md2, c);
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else if( c == '\n' ) {
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md_putc(md2, '\r');
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md_putc(md2, c);
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}
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else if( c != '\n' && lc == '\r' ) {
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md_putc(md2, '\n');
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md_putc(md2, c);
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}
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else
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md_putc(md2, c);
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if( md )
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md_putc(md, c );
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lc = c;
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}
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}
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else {
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while( (c = iobuf_get(fp)) != -1 ) {
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if( md )
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md_putc(md, c );
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}
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}
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}
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/****************
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* Ask for the detached datafile and calculate the digest from it.
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* INFILE is the name of the input file.
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*/
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int
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ask_for_detached_datafile( MD_HANDLE md, MD_HANDLE md2,
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const char *inname, int textmode )
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{
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progress_filter_context_t pfx;
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char *answer = NULL;
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IOBUF fp;
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int rc = 0;
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fp = open_sigfile( inname, &pfx ); /* open default file */
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if( !fp && !opt.batch ) {
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int any=0;
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tty_printf(_("Detached signature.\n"));
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do {
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m_free(answer);
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answer = cpr_get("detached_signature.filename",
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_("Please enter name of data file: "));
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cpr_kill_prompt();
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if( any && !*answer ) {
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rc = G10ERR_READ_FILE;
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goto leave;
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}
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fp = iobuf_open(answer);
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if( !fp && errno == ENOENT ) {
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tty_printf("No such file, try again or hit enter to quit.\n");
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any++;
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}
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else if( !fp ) {
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log_error("can't open `%s': %s\n", answer, strerror(errno) );
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rc = G10ERR_READ_FILE;
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goto leave;
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}
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} while( !fp );
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}
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if( !fp ) {
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if( opt.verbose )
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log_info(_("reading stdin ...\n"));
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fp = iobuf_open( NULL );
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assert(fp);
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}
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do_hash( md, md2, fp, textmode );
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iobuf_close(fp);
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leave:
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m_free(answer);
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return rc;
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}
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/****************
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* Hash the given files and append the hash to hash context md.
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* If FILES is NULL, hash stdin.
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*/
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int
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hash_datafiles( MD_HANDLE md, MD_HANDLE md2, STRLIST files,
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const char *sigfilename, int textmode )
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{
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progress_filter_context_t pfx;
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IOBUF fp;
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STRLIST sl;
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if( !files ) {
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/* check whether we can open the signed material */
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fp = open_sigfile( sigfilename, &pfx );
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if( fp ) {
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do_hash( md, md2, fp, textmode );
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iobuf_close(fp);
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return 0;
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}
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log_error (_("no signed data\n"));
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return G10ERR_OPEN_FILE;
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}
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for (sl=files; sl; sl = sl->next ) {
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fp = iobuf_open( sl->d );
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if( !fp ) {
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log_error(_("can't open signed data `%s'\n"),
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print_fname_stdin(sl->d));
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return G10ERR_OPEN_FILE;
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}
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handle_progress (&pfx, fp, sl->d);
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do_hash( md, md2, fp, textmode );
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iobuf_close(fp);
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}
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return 0;
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}
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