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plaintext.c
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/* plaintext.c - process an plaintext packet
* Copyright (C) 1998, 1999 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "util.h"
#include "memory.h"
#include "options.h"
#include "packet.h"
#include "ttyio.h"
#include "filter.h"
#include "main.h"
#include "status.h"
#include "i18n.h"
/****************
* Handle a plaintext packet. If MFX is not NULL, update the MDs
* Note: we should use the filter stuff here, but we have to add some
* easy mimic to set a read limit, so we calculate only the
* bytes from the plaintext.
*/
int
handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx,
int nooutput, int clearsig )
{
char *fname = NULL;
FILE *fp = NULL;
int rc = 0;
int c;
int convert = pt->mode == 't';
/* create the filename as C string */
if( nooutput )
;
else if( opt.outfile ) {
fname = m_alloc( strlen( opt.outfile ) + 1);
strcpy(fname, opt.outfile );
}
else if( pt->namelen == 8 && !memcmp( pt->name, "_CONSOLE", 8 ) ) {
log_info(_("data not saved; use option \"--output\" to save it\n"));
nooutput = 1;
}
else {
fname = m_alloc( pt->namelen +1 );
memcpy( fname, pt->name, pt->namelen );
fname[pt->namelen] = 0;
}
if( nooutput )
;
else if( !*fname || (*fname=='-' && !fname[1])) {
/* no filename or "-" given; write to stdout */
fp = stdout;
}
else if( !overwrite_filep( fname ) ) {
rc = G10ERR_CREATE_FILE;
goto leave;
}
if( fp || nooutput )
;
else if( !(fp = fopen(fname,"wb")) ) {
log_error("Error creating `%s': %s\n", fname, strerror(errno) );
rc = G10ERR_CREATE_FILE;
goto leave;
}
if( pt->len ) {
assert( !clearsig );
for( ; pt->len; pt->len-- ) {
if( (c = iobuf_get(pt->buf)) == -1 ) {
log_error("Problem reading source (%u bytes remaining)\n",
(unsigned)pt->len);
rc = G10ERR_READ_FILE;
goto leave;
}
if( mfx->md )
md_putc(mfx->md, c );
if( convert && c == '\r' )
continue; /* fixme: this hack might be too simple */
if( fp ) {
if( putc( c, fp ) == EOF ) {
log_error("Error writing to `%s': %s\n",
fname, strerror(errno) );
rc = G10ERR_WRITE_FILE;
goto leave;
}
}
}
}
else if( !clearsig ) {
while( (c = iobuf_get(pt->buf)) != -1 ) {
if( mfx->md )
md_putc(mfx->md, c );
if( convert && c == '\r' )
continue; /* fixme: this hack might be too simple */
if( fp ) {
if( putc( c, fp ) == EOF ) {
log_error("Error writing to `%s': %s\n",
fname, strerror(errno) );
rc = G10ERR_WRITE_FILE;
goto leave;
}
}
}
pt->buf = NULL;
}
else { /* clear text signature - don't hash the last cr,lf */
int state = 0;
while( (c = iobuf_get(pt->buf)) != -1 ) {
if( fp ) {
if( putc( c, fp ) == EOF ) {
log_error("Error writing to `%s': %s\n",
fname, strerror(errno) );
rc = G10ERR_WRITE_FILE;
goto leave;
}
}
if( !mfx->md )
continue;
if( state == 2 ) {
md_putc(mfx->md, '\r' );
md_putc(mfx->md, '\n' );
state = 0;
}
if( !state ) {
if( c == '\r' )
state = 1;
else
md_putc(mfx->md, c );
}
else if( state == 1 ) {
if( c == '\n' )
state = 2;
else {
md_putc(mfx->md, '\r' );
if( c == '\r' )
state = 1;
else {
state = 0;
md_putc(mfx->md, c );
}
}
}
}
pt->buf = NULL;
}
if( fp && fp != stdout && fclose(fp) ) {
log_error("Error closing `%s': %s\n", fname, strerror(errno) );
fp = NULL;
rc = G10ERR_WRITE_FILE;
goto leave;
}
fp = NULL;
leave:
if( fp && fp != stdout )
fclose(fp);
m_free(fname);
return rc;
}
/****************
* Ask for the detached datafile and calculate the digest from it.
* INFILE is the name of the input file.
*/
int
ask_for_detached_datafile( md_filter_context_t *mfx, const char *inname )
{
char *answer = NULL;
IOBUF fp;
int rc = 0;
int c;
fp = open_sigfile( inname ); /* open default file */
if( !fp && !opt.batch ) {
int any=0;
tty_printf("Detached signature.\n");
do {
m_free(answer);
answer = cpr_get("detached_signature.filename",
_("Please enter name of data file: "));
cpr_kill_prompt();
if( any && !*answer ) {
rc = G10ERR_READ_FILE;
goto leave;
}
fp = iobuf_open(answer);
if( !fp && errno == ENOENT ) {
tty_printf("No such file, try again or hit enter to quit.\n");
any++;
}
else if( !fp ) {
log_error("can't open `%s': %s\n", answer, strerror(errno) );
rc = G10ERR_READ_FILE;
goto leave;
}
} while( !fp );
}
if( !fp ) {
if( opt.verbose )
log_info(_("reading stdin ...\n"));
while( (c = getchar()) != EOF ) {
if( mfx->md )
md_putc(mfx->md, c );
}
}
else {
while( (c = iobuf_get(fp)) != -1 ) {
if( mfx->md )
md_putc(mfx->md, c );
}
iobuf_close(fp);
}
leave:
m_free(answer);
return rc;
}
static void
do_hash( MD_HANDLE md, IOBUF fp, int textmode )
{
text_filter_context_t tfx;
int c;
if( textmode ) {
memset( &tfx, 0, sizeof tfx);
iobuf_push_filter( fp, text_filter, &tfx );
}
while( (c = iobuf_get(fp)) != -1 )
md_putc(md, c );
}
/****************
* Hash the given files and append the hash to hash context md.
* If FILES is NULL, hash stdin.
*/
int
hash_datafiles( MD_HANDLE md, STRLIST files,
const char *sigfilename, int textmode )
{
IOBUF fp;
STRLIST sl=NULL;
if( !files ) {
/* check whether we can open the signed material */
fp = open_sigfile( sigfilename );
if( fp ) {
do_hash( md, fp, textmode );
iobuf_close(fp);
return 0;
}
/* no we can't (no sigfile) - read signed stuff from stdin */
add_to_strlist( &sl, "-");
}
else
sl = files;
for( ; sl; sl = sl->next ) {
fp = iobuf_open( sl->d );
if( !fp ) {
log_error(_("can't open signed data `%s'\n"),
print_fname_stdin(sl->d));
if( !files )
free_strlist(sl);
return G10ERR_OPEN_FILE;
}
do_hash( md, fp, textmode );
iobuf_close(fp);
}
if( !files )
free_strlist(sl);
return 0;
}

File Metadata

Mime Type
text/x-c
Expires
Sat, Apr 25, 2:48 PM (1 d, 7 h)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
b6/67/99b8f68a5838932e4e7997db441e

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