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gnupg/g10/pipemode.c
Werner Koch c0c2c58054 Finished the bulk of changes for gnupg 1.9. This included switching 
to libgcrypt functions, using shared error codes from libgpg-error,
replacing the old functions we used to have in ../util by those in
../jnlib and ../common, renaming the malloc functions and a couple of
types.  Note, that not all changes are listed below becuause they are
too similar and done at far too many places.  As of today the code
builds using the current libgcrypt from CVS but it is very unlikely
that it actually works.
2003-06-18 19:56:13 +00:00

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/* pipemode.c - pipemode handler
* Copyright (C) 1998, 1990, 2000, 2001 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 "options.h"
#include "packet.h"
#include "errors.h"
#include "iobuf.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "main.h"
#include "status.h"
#include "filter.h"
#define CONTROL_PACKET_SPACE 30
#define FAKED_LITERAL_PACKET_SPACE (9+2+2)
enum pipemode_state_e {
STX_init = 0,
STX_wait_operation,
STX_begin,
STX_text,
STX_detached_signature,
STX_detached_signature_wait_text,
STX_signed_data,
STX_wait_init
};
struct pipemode_context_s {
enum pipemode_state_e state;
int operation;
int stop;
int block_mode;
UnarmorPump unarmor_ctx;
};
static size_t
make_control ( byte *buf, int code, int operation )
{
const byte *sesmark;
size_t sesmarklen, n=0;;
sesmark = get_session_marker( &sesmarklen );
if ( sesmarklen > 20 )
BUG();
buf[n++] = 0xff; /* new format, type 63, 1 length byte */
n++; /* length will fixed below */
memcpy(buf+n, sesmark, sesmarklen ); n+= sesmarklen;
buf[n++] = CTRLPKT_PIPEMODE;
buf[n++] = code;
buf[n++] = operation;
buf[1] = n-2;
return n;
}
static int
pipemode_filter( void *opaque, int control,
iobuf_t a, byte *buf, size_t *ret_len)
{
size_t size = *ret_len;
struct pipemode_context_s *stx = opaque;
int rc=0;
size_t n = 0;
int esc = 0;
if( control == IOBUFCTRL_UNDERFLOW ) {
*ret_len = 0;
/* reserve some space for one control packet */
if ( size <= CONTROL_PACKET_SPACE+FAKED_LITERAL_PACKET_SPACE )
BUG();
size -= CONTROL_PACKET_SPACE+FAKED_LITERAL_PACKET_SPACE;
if ( stx->block_mode ) {
/* reserve 2 bytes for the block length */
buf[n++] = 0;
buf[n++] = 0;
}
while ( n < size ) {
/* FIXME: we have to make sure that we have a large enough
* buffer for a control packet even after we already read
* something. The easest way to do this is probably by ungetting
* the control sequence and returning the buffer we have
* already assembled */
int c = iobuf_get (a);
if (c == -1) {
if ( stx->state != STX_init ) {
log_error ("EOF encountered at wrong state\n");
stx->stop = 1;
return -1;
}
break;
}
if ( esc ) {
switch (c) {
case '@':
if ( stx->state == STX_text ) {
buf[n++] = c;
break;
}
else if ( stx->state == STX_detached_signature ) {
esc = 0;
goto do_unarmor; /* not a very elegant solution */
}
else if ( stx->state == STX_detached_signature_wait_text) {
esc = 0;
break; /* just ignore it in this state */
}
log_error ("@@ not allowed in current state\n");
return -1;
case '<': /* begin of stream part */
if ( stx->state != STX_init ) {
log_error ("nested begin of stream\n");
stx->stop = 1;
return -1;
}
stx->state = STX_wait_operation;
stx->block_mode = 0;
unarmor_pump_release (stx->unarmor_ctx);
stx->unarmor_ctx = NULL;
break;
case '>': /* end of stream part */
if ( stx->state != STX_wait_init ) {
log_error ("invalid state for @>\n");
stx->stop = 1;
return -1;
}
stx->state = STX_init;
break;
case 'V': /* operation = verify */
case 'E': /* operation = encrypt */
case 'S': /* operation = sign */
case 'B': /* operation = detach sign */
case 'C': /* operation = clearsign */
case 'D': /* operation = decrypt */
if ( stx->state != STX_wait_operation ) {
log_error ("invalid state for operation code\n");
stx->stop = 1;
return -1;
}
stx->operation = c;
if ( stx->operation == 'B') {
stx->state = STX_detached_signature;
if ( !opt.no_armor )
stx->unarmor_ctx = unarmor_pump_new ();
}
else
stx->state = STX_begin;
n += make_control ( buf+n, 1, stx->operation );
/* must leave after a control packet */
goto leave;
case 't': /* plaintext text follows */
if ( stx->state == STX_detached_signature_wait_text )
stx->state = STX_detached_signature;
if ( stx->state == STX_detached_signature ) {
if ( stx->operation != 'B' ) {
log_error ("invalid operation for this state\n");
stx->stop = 1;
return -1;
}
stx->state = STX_signed_data;
n += make_control ( buf+n, 2, 'B' );
/* and now we fake a literal data packet much the same
* as in armor.c */
buf[n++] = 0xaf; /* old packet format, type 11,
var length */
buf[n++] = 0; /* set the length header */
buf[n++] = 6;
buf[n++] = 'b'; /* we ignore it anyway */
buf[n++] = 0; /* namelength */
memset(buf+n, 0, 4); /* timestamp */
n += 4;
/* and return now so that we are sure to have
* more space in the bufer for the next control
* packet */
stx->block_mode = 1;
goto leave2;
}
else {
log_error ("invalid state for @t\n");
stx->stop = 1;
return -1;
}
break;
case '.': /* ready */
if ( stx->state == STX_signed_data ) {
if (stx->block_mode) {
buf[0] = (n-2) >> 8;
buf[1] = (n-2);
if ( buf[0] || buf[1] ) {
/* end of blocks marker */
buf[n++] = 0;
buf[n++] = 0;
}
stx->block_mode = 0;
}
n += make_control ( buf+n, 3, 'B' );
}
else {
log_error ("invalid state for @.\n");
stx->stop = 1;
return -1;
}
stx->state = STX_wait_init;
goto leave;
default:
log_error ("invalid escape sequence 0x%02x in stream\n",
c);
stx->stop = 1;
return -1;
}
esc = 0;
}
else if (c == '@')
esc = 1;
else if (stx->unarmor_ctx) {
do_unarmor: /* used to handle a @@ */
c = unarmor_pump (stx->unarmor_ctx, c);
if ( !(c & ~255) )
buf[n++] = c;
else if ( c < 0 ) {
/* end of armor or error - we don't care becuase
the armor can be modified anyway. The unarmored
stuff should stand for itself. */
unarmor_pump_release (stx->unarmor_ctx);
stx->unarmor_ctx = NULL;
stx->state = STX_detached_signature_wait_text;
}
}
else if (stx->state == STX_detached_signature_wait_text)
; /* just wait */
else
buf[n++] = c;
}
leave:
if ( !n ) {
stx->stop = 1;
rc = -1; /* eof */
}
if ( stx->block_mode ) {
/* fixup the block length */
buf[0] = (n-2) >> 8;
buf[1] = (n-2);
}
leave2:
/*log_hexdump ("pipemode:", buf, n );*/
*ret_len = n;
}
else if( control == IOBUFCTRL_DESC )
*(char**)buf = "pipemode_filter";
return rc;
}
void
run_in_pipemode(void)
{
iobuf_t fp;
armor_filter_context_t afx;
struct pipemode_context_s stx;
int rc;
memset( &afx, 0, sizeof afx);
memset( &stx, 0, sizeof stx);
fp = iobuf_open("-");
iobuf_push_filter (fp, pipemode_filter, &stx );
do {
write_status (STATUS_BEGIN_STREAM);
rc = proc_packets( NULL, fp );
write_status (STATUS_END_STREAM);
} while ( !stx.stop );
}
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