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07250279e7
* passphrase.c: Don't check for __CYGWIN__, so it is treated as a unix-like system. * options.h, g10.c (main), textfilter.c (standard): Use new option --rfc2440-text to determine whether to filter "<space>\t\r\n" or just "\r\n" before canonicalizing text line endings. Default to "<space>\t\r\n".
248 lines
6.6 KiB
C
248 lines
6.6 KiB
C
/* textfilter.c
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* Copyright (C) 1998, 1999, 2000, 2001, 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 "errors.h"
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#include "iobuf.h"
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#include "memory.h"
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#include "util.h"
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#include "filter.h"
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#include "i18n.h"
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#include "options.h"
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#ifdef HAVE_DOSISH_SYSTEM
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#define LF "\r\n"
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#else
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#define LF "\n"
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#endif
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#define MAX_LINELEN 19995 /* a little bit smaller than in armor.c */
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/* to make sure that a warning is displayed while */
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/* creating a message */
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static unsigned
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len_without_trailing_chars( byte *line, unsigned len, const char *trimchars )
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{
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byte *p, *mark;
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unsigned n;
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for(mark=NULL, p=line, n=0; n < len; n++, p++ ) {
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if( strchr( trimchars, *p ) ) {
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if( !mark )
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mark = p;
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}
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else
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mark = NULL;
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}
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return mark? (mark - line) : len;
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}
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static int
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standard( text_filter_context_t *tfx, IOBUF a,
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byte *buf, size_t size, size_t *ret_len)
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{
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int rc=0;
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size_t len = 0;
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unsigned maxlen;
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assert( size > 10 );
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size -= 2; /* reserve 2 bytes to append CR,LF */
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while( !rc && len < size ) {
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int lf_seen;
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while( len < size && tfx->buffer_pos < tfx->buffer_len )
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buf[len++] = tfx->buffer[tfx->buffer_pos++];
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if( len >= size )
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continue;
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/* read the next line */
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maxlen = MAX_LINELEN;
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tfx->buffer_pos = 0;
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tfx->buffer_len = iobuf_read_line( a, &tfx->buffer,
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&tfx->buffer_size, &maxlen );
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if( !maxlen )
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tfx->truncated++;
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if( !tfx->buffer_len ) {
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if( !len )
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rc = -1; /* eof */
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break;
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}
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lf_seen = tfx->buffer[tfx->buffer_len-1] == '\n';
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/* The story behind this is that 2440 says that textmode
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hashes should canonicalize line endings to CRLF and remove
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spaces and tabs. 2440bis-12 says to just canonicalize to
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CRLF. 1.4.0 was released using the bis-12 behavior, but it
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was discovered that many mail clients do not canonicalize
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PGP/MIME signature text appropriately (and were relying on
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GnuPG to handle trailing spaces). So, we default to the
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2440 behavior, but use the 2440bis-12 behavior if the user
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specifies --no-rfc2440-text. The default will be changed
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at some point in the future when the mail clients have been
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upgraded. Aside from PGP/MIME and broken mail clients,
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this makes no difference to any signatures in the real
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world except for a textmode detached signature. PGP always
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used the 2440bis-12 behavior (ignoring 2440 itself), so
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this actually makes us compatible with PGP textmode
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detached signatures for the first time. */
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if(opt.rfc2440_text)
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tfx->buffer_len=trim_trailing_chars(tfx->buffer,tfx->buffer_len,
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" \t\r\n");
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else
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tfx->buffer_len=trim_trailing_chars(tfx->buffer,tfx->buffer_len,
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"\r\n");
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if( lf_seen ) {
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tfx->buffer[tfx->buffer_len++] = '\r';
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tfx->buffer[tfx->buffer_len++] = '\n';
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}
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}
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*ret_len = len;
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return rc;
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}
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/****************
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* The filter is used to make canonical text: Lines are terminated by
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* CR, LF, trailing white spaces are removed.
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*/
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int
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text_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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text_filter_context_t *tfx = opaque;
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int rc=0;
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if( control == IOBUFCTRL_UNDERFLOW ) {
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rc = standard( tfx, a, buf, size, ret_len );
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}
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else if( control == IOBUFCTRL_FREE ) {
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if( tfx->truncated )
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log_error(_("can't handle text lines longer than %d characters\n"),
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MAX_LINELEN );
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m_free( tfx->buffer );
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tfx->buffer = NULL;
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}
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else if( control == IOBUFCTRL_DESC )
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*(char**)buf = "text_filter";
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return rc;
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}
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/****************
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* Copy data from INP to OUT and do some escaping if requested.
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* md is updated as required by rfc2440
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*/
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int
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copy_clearsig_text( IOBUF out, IOBUF inp, MD_HANDLE md,
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int escape_dash, int escape_from, int pgp2mode )
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{
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unsigned maxlen;
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byte *buffer = NULL; /* malloced buffer */
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unsigned bufsize; /* and size of this buffer */
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unsigned n;
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int truncated = 0;
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int pending_lf = 0;
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if( !opt.pgp2_workarounds )
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pgp2mode = 0;
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if( !escape_dash )
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escape_from = 0;
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for(;;) {
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maxlen = MAX_LINELEN;
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n = iobuf_read_line( inp, &buffer, &bufsize, &maxlen );
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if( !maxlen )
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truncated++;
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if( !n )
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break; /* read_line has returned eof */
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/* update the message digest */
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if( escape_dash ) {
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if( pending_lf ) {
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md_putc( md, '\r' );
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md_putc( md, '\n' );
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}
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md_write( md, buffer,
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len_without_trailing_chars( buffer, n,
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pgp2mode? " \r\n":" \t\r\n"));
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}
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else
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md_write( md, buffer, n );
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pending_lf = buffer[n-1] == '\n';
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/* write the output */
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if( ( escape_dash && *buffer == '-')
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|| ( escape_from && n > 4 && !memcmp(buffer, "From ", 5 ) ) ) {
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iobuf_put( out, '-' );
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iobuf_put( out, ' ' );
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}
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#if 0 /*defined(HAVE_DOSISH_SYSTEM)*/
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/* We don't use this anymore because my interpretation of rfc2440 7.1
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* is that there is no conversion needed. If one decides to
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* clearsign a unix file on a DOS box he will get a mixed line endings.
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* If at some point it turns out, that a conversion is a nice feature
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* we can make an option out of it.
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*/
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/* make sure the lines do end in CR,LF */
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if( n > 1 && ( (buffer[n-2] == '\r' && buffer[n-1] == '\n' )
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|| (buffer[n-2] == '\n' && buffer[n-1] == '\r'))) {
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iobuf_write( out, buffer, n-2 );
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iobuf_put( out, '\r');
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iobuf_put( out, '\n');
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}
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else if( n && buffer[n-1] == '\n' ) {
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iobuf_write( out, buffer, n-1 );
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iobuf_put( out, '\r');
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iobuf_put( out, '\n');
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}
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else
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iobuf_write( out, buffer, n );
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#else
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iobuf_write( out, buffer, n );
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#endif
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}
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/* at eof */
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if( !pending_lf ) { /* make sure that the file ends with a LF */
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iobuf_writestr( out, LF );
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if( !escape_dash )
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md_putc( md, '\n' );
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}
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if( truncated )
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log_info(_("input line longer than %d characters\n"), MAX_LINELEN );
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return 0; /* okay */
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}
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