trustdb.c
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trustdb.c
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	/* trustdb.c
	* Copyright (C) 1998 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 <ctype.h>
	#include <assert.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <unistd.h>

	#include "errors.h"
	#include "iobuf.h"
	#include "keydb.h"
	#include "memory.h"
	#include "util.h"
	#include "trustdb.h"
	#include "options.h"
	#include "packet.h"
	#include "main.h"
	#include "i18n.h"
	#include "tdbio.h"


	#if MAX_FINGERPRINT_LEN > 20
	#error Must change structure of trustdb
	#endif

	typedef struct local_id_info *LOCAL_ID_INFO;
	struct local_id_info {
	LOCAL_ID_INFO next;
	ulong lid;
	unsigned flag;
	};


	typedef struct trust_info TRUST_INFO;
	struct trust_info {
	ulong lid;
	unsigned trust;
	};


	typedef struct trust_seg_list *TRUST_SEG_LIST;
	struct trust_seg_list {
	TRUST_SEG_LIST next;
	int nseg; /* number of segmens */
	int dup;
	TRUST_INFO seg[1]; /* segment list */
	};


	typedef struct {
	TRUST_SEG_LIST tsl;
	int index;
	} ENUM_TRUST_WEB_CONTEXT;


	static int walk_sigrecs( SIGREC_CONTEXT *c, int create );

	static LOCAL_ID_INFO *new_lid_table(void);
	static void release_lid_table( LOCAL_ID_INFO *tbl );
	static int ins_lid_table_item( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag );
	static int qry_lid_table_flag( LOCAL_ID_INFO tbl, ulong lid, unsigned flag );
	static void upd_lid_table_flag( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag );

	static void print_user_id( const char text, u32 keyid );
	static int do_list_path( TRUST_INFO *stack, int depth, int max_depth,
	LOCAL_ID_INFO lids, TRUST_SEG_LIST tslist );
	static int update_sigs_by_lid( ulong lid );

	static int list_sigs( ulong pubkey_id );
	static int propagate_trust( TRUST_SEG_LIST tslist );
	static int do_check( TRUSTREC drec, unsigned trustlevel );


	/* a table used to keep track of ultimately trusted keys
	* which are the ones from our secrings */
	static LOCAL_ID_INFO *ultikey_table;

	static ulong last_trust_web_key;
	static TRUST_SEG_LIST last_trust_web_tslist;


	#define HEXTOBIN(a) ( (a) >= '0' && (a) <= '9' ? ((a)-'0') : \
	(a) >= 'A' && (a) <= 'F' ? ((a)-'A'+10) : ((a)-'a'+10))

	/**********************************************
	*********** list helpers *****************
	**********************************************/

	static LOCAL_ID_INFO *
	new_lid_table(void)
	{
	return m_alloc_clear( 16 * sizeof(LOCAL_ID_INFO));
	}

	static void
	release_lid_table( LOCAL_ID_INFO *tbl )
	{
	LOCAL_ID_INFO a, a2;
	int i;

	for(i=0; i < 16; i++ ) {
	for(a=tbl[i]; a; a = a2 ) {
	a2 = a->next;
	m_free(a);
	}
	}
	m_free(tbl);
	}

	/****************
	* Add a new item to the table or return 1 if we already have this item
	* fixme: maybe it's a good idea to take items from an unused item list.
	*/
	static int
	ins_lid_table_item( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag )
	{
	LOCAL_ID_INFO a;

	for( a = tbl[lid & 0x0f]; a; a = a->next )
	if( a->lid == lid )
	return 1;
	a = m_alloc( sizeof *a );
	a->lid = lid;
	a->flag = flag;
	a->next = tbl[lid & 0x0f];
	tbl[lid & 0x0f] = a;
	return 0;
	}

	static int
	qry_lid_table_flag( LOCAL_ID_INFO tbl, ulong lid, unsigned flag )
	{
	LOCAL_ID_INFO a;

	for( a = tbl[lid & 0x0f]; a; a = a->next )
	if( a->lid == lid ) {
	if( flag )
	*flag = a->flag;
	return 0;
	}
	return -1;
	}

	static void
	upd_lid_table_flag( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag )
	{
	LOCAL_ID_INFO a;

	for( a = tbl[lid & 0x0f]; a; a = a->next )
	if( a->lid == lid ) {
	a->flag = flag;
	return;
	}
	BUG();
	}

	/****************
	* If we do not have a local_id in a signature packet, find the owner of
	* the signature packet in our trustdb or insert them into the trustdb
	*/
	static int
	set_signature_packets_lid( PKT_signature *sig )
	{
	PKT_public_key pk = m_alloc_clear( sizeof pk );
	TRUSTREC rec;
	int rc;

	rc = get_pubkey( pk, sig->keyid );
	if( rc)
	goto leave;
	if( !pk->local_id ) {
	rc = tdbio_search_dir_bypk( pk, &rec );
	if( rc == -1 )
	rc = insert_trust_record( pk );
	if( rc )
	goto leave;
	}
	sig->local_id = pk->local_id;

	leave:
	free_public_key( pk );
	return rc;
	}



	/****************
	* Return the keyid from the primary key identified by LID.
	*/
	int
	keyid_from_lid( ulong lid, u32 *keyid )
	{
	TRUSTREC rec;
	int rc;

	rc = tdbio_read_record( lid, &rec, RECTYPE_DIR );
	if( rc ) {
	log_error("error reading dir record for LID %lu: %s\n",
	lid, g10_errstr(rc));
	return G10ERR_TRUSTDB;
	}
	if( !rec.r.dir.keylist ) {
	log_error("no primary key for LID %lu\n", lid );
	return G10ERR_TRUSTDB;
	}
	rc = tdbio_read_record( rec.r.dir.keylist, &rec, RECTYPE_KEY );
	if( rc ) {
	log_error("error reading primary key for LID %lu: %s\n",
	lid, g10_errstr(rc));
	return G10ERR_TRUSTDB;
	}
	keyid_from_fingerprint( rec.r.key.fingerprint, rec.r.key.fingerprint_len,
	keyid );

	return 0;
	}

	/****************
	* Walk through the signatures of a public key.
	* The caller must provide a context structure, with all fields set
	* to zero, but the local_id field set to the requested key;
	* This function does not change this field. On return the context
	* is filled with the local-id of the signature and the signature flag.
	* No fields should be changed (clearing all fields and setting
	* pubkeyid is okay to continue with an other pubkey)
	* Returns: 0 - okay, -1 for eof (no more sigs) or any other errorcode
	*/
	static int
	walk_sigrecs( SIGREC_CONTEXT *c, int create )
	{
	int rc=0;
	TRUSTREC *r;
	ulong rnum;

	if( c->ctl.eof )
	return -1;
	r = &c->ctl.rec;
	if( !c->ctl.init_done ) {
	c->ctl.init_done = 1;
	rc = tdbio_read_record( c->lid, r, RECTYPE_DIR );
	if( rc ) {
	log_error("LID %lu: error reading dir record: %s\n",
	c->lid, g10_errstr(rc));
	return rc;
	}
	c->ctl.nextuid = r->r.dir.uidlist;
	/* force a read (what a bad bad hack) */
	c->ctl.index = SIGS_PER_RECORD;
	r->r.sig.next = 0;
	}

	/* need a loop to skip over deleted sigs */
	do {
	if( c->ctl.index >= SIGS_PER_RECORD ) { /* read the record */
	rnum = r->r.sig.next;
	if( !rnum && c->ctl.nextuid ) { /* read next uid record */
	rc = tdbio_read_record( c->ctl.nextuid, r, RECTYPE_UID );
	if( rc ) {
	log_error("error reading next uidrec: %s\n",
	g10_errstr(rc));
	c->ctl.eof = 1;
	return rc;
	}
	if( !r->r.uid.siglist && create ) {
	rc = update_sigs_by_lid( c->lid );
	if( rc ) {
	if( rc == G10ERR_BAD_CERT )
	rc = -1; /* maybe no selfsignature */
	if( rc != -1 )
	log_info("LID %lu: "
	"error building sigs on the fly: %s\n",
	c->lid, g10_errstr(rc) );
	c->ctl.eof = 1;
	return rc;
	}
	rc = tdbio_read_record( c->ctl.nextuid, r, RECTYPE_UID );
	if( rc ) {
	log_error("LID %lu: error re-reading uid record: %s\n",
	c->lid, g10_errstr(rc));
	return rc;
	}
	}
	c->ctl.nextuid = r->r.uid.next;
	rnum = r->r.uid.siglist;
	}
	if( !rnum ) {
	c->ctl.eof = 1;
	return -1; /* return eof */
	}
	rc = tdbio_read_record( rnum, r, RECTYPE_SIG );
	if( rc ) {
	log_error(_("error reading sigrec: %s\n"), g10_errstr(rc));
	c->ctl.eof = 1;
	return rc;
	}
	if( r->r.sig.lid != c->lid ) {
	log_error(_("chained sigrec %lu has a wrong owner\n"), rnum );
	c->ctl.eof = 1;
	return G10ERR_TRUSTDB;
	}
	c->ctl.index = 0;
	}
	} while( !r->r.sig.sig[c->ctl.index++].lid );

	c->sig_lid = r->r.sig.sig[c->ctl.index-1].lid;
	c->sig_flag = r->r.sig.sig[c->ctl.index-1].flag;
	return 0;
	}




	/***********************************************
	*********** Trust stuff ****************
	***********************************************/


	/****************
	* Verify that all our public keys are in the trustDB.
	*/
	static int
	verify_own_keys()
	{
	int rc;
	void *enum_context = NULL;
	PKT_secret_key sk = m_alloc_clear( sizeof sk );
	PKT_public_key pk = m_alloc_clear( sizeof pk );
	u32 keyid[2];

	while( !(rc=enum_secret_keys( &enum_context, sk, 0 ) ) ) {
	keyid_from_sk( sk, keyid );

	if( DBG_TRUST )
	log_debug("key %08lX: checking secret key\n", (ulong)keyid[1] );

	/* see whether we can access the public key of this secret key */
	memset( pk, 0, sizeof *pk );
	rc = get_pubkey( pk, keyid );
	if( rc ) {
	log_error(_("key %08lX: secret key without public key\n"),
	(ulong)keyid[1] );
	goto leave;
	}
	if( cmp_public_secret_key( pk, sk ) ) {
	log_error(_("key %08lX: secret and public key don't match\n"),
	(ulong)keyid[1] );
	rc = G10ERR_GENERAL;
	goto leave;
	}

	/* make sure that the pubkey is in the trustdb */
	rc = query_trust_record( pk );
	if( rc == -1 ) { /* put it into the trustdb */
	rc = insert_trust_record( pk );
	if( rc ) {
	log_error(_("key %08lX: can't put it into the trustdb\n"),
	(ulong)keyid[1] );
	goto leave;
	}
	}
	else if( rc ) {
	log_error(_("key %08lX: query record failed\n"), (ulong)keyid[1] );
	goto leave;

	}

	if( DBG_TRUST )
	log_debug("key %08lX.%lu: stored into ultikey_table\n",
	(ulong)keyid[1], pk->local_id );
	if( ins_lid_table_item( ultikey_table, pk->local_id, 0 ) )
	log_error(_("key %08lX: already in ultikey_table\n"),
	(ulong)keyid[1]);

	release_secret_key_parts( sk );
	release_public_key_parts( pk );
	}
	if( rc != -1 )
	log_error(_("enum_secret_keys failed: %s\n"), g10_errstr(rc) );
	else
	rc = 0;

	leave:
	free_secret_key( sk );
	free_public_key( pk );
	return rc;
	}


	static void
	print_user_id( const char text, u32 keyid )
	{
	char *p;
	size_t n;

	p = get_user_id( keyid, &n );
	if( *text ) {
	fputs( text, stdout);
	putchar(' ');
	}
	putchar('\"');
	print_string( stdout, p, n, 0 );
	putchar('\"');
	putchar('\n');
	m_free(p);
	}

	static void
	print_keyid( FILE *fp, ulong lid )
	{
	u32 ki[2];
	if( keyid_from_lid( lid, ki ) )
	fprintf(fp, "????????.%lu", lid );
	else
	fprintf(fp, "%08lX.%lu", (ulong)ki[1], lid );
	}

	static void
	print_trust( FILE *fp, unsigned trust )
	{
	int c;
	switch( trust ) {
	case TRUST_UNKNOWN: c = 'o'; break;
	case TRUST_EXPIRED: c = 'e'; break;
	case TRUST_UNDEFINED: c = 'q'; break;
	case TRUST_NEVER: c = 'n'; break;
	case TRUST_MARGINAL: c = 'm'; break;
	case TRUST_FULLY: c = 'f'; break;
	case TRUST_ULTIMATE: c = 'u'; break;
	default: fprintf(fp, "%02x", trust ); return;
	}
	putc(c, fp);
	}

	/* (a non-recursive algorithm would be easier) */
	static int
	do_list_sigs( ulong root, ulong pubkey, int depth,
	LOCAL_ID_INFO lids, unsigned lineno )
	{
	SIGREC_CONTEXT sx;
	int rc;
	u32 keyid[2];

	memset( &sx, 0, sizeof sx );
	sx.lid = pubkey;
	for(;;) {
	rc = walk_sigrecs( &sx, 0 );
	if( rc )
	break;
	rc = keyid_from_lid( sx.sig_lid, keyid );
	if( rc ) {
	printf("%6u: %s????????.%lu:%02x\n", lineno, depth*4, "",
	sx.sig_lid, sx.sig_flag );
	++*lineno;
	}
	else {
	printf("%6u: %s%08lX.%lu:%02x ", lineno, depth*4, "",
	(ulong)keyid[1], sx.sig_lid, sx.sig_flag );
	/* check whether we already checked this pubkey */
	if( !qry_lid_table_flag( ultikey_table, sx.sig_lid, NULL ) ) {
	print_user_id("[ultimately trusted]", keyid);
	++*lineno;
	}
	else if( sx.sig_lid == pubkey ) {
	printf("[self-signature]\n");
	++*lineno;
	}
	else if( sx.sig_lid == root ) {
	printf("[closed]\n");
	++*lineno;
	}
	else if( ins_lid_table_item( lids, sx.sig_lid, *lineno ) ) {
	unsigned refline;
	qry_lid_table_flag( lids, sx.sig_lid, &refline );
	printf("[see line %u]\n", refline);
	++*lineno;
	}
	else if( depth+1 >= MAX_LIST_SIGS_DEPTH ) {
	print_user_id( "[too deeply nested]", keyid );
	++*lineno;
	}
	else {
	print_user_id( "", keyid );
	++*lineno;
	rc = do_list_sigs( root, sx.sig_lid, depth+1, lids, lineno );
	if( rc )
	break;
	}
	}
	}
	return rc==-1? 0 : rc;
	}

	/****************
	* List all signatures of a public key
	*/
	static int
	list_sigs( ulong pubkey_id )
	{
	int rc;
	u32 keyid[2];
	LOCAL_ID_INFO *lids;
	unsigned lineno = 1;

	rc = keyid_from_lid( pubkey_id, keyid );
	if( rc )
	return rc;
	printf("Signatures of %08lX.%lu ", (ulong)keyid[1], pubkey_id );
	print_user_id("", keyid);
	printf("----------------------\n");

	lids = new_lid_table();
	rc = do_list_sigs( pubkey_id, pubkey_id, 0, lids, &lineno );
	putchar('\n');
	release_lid_table(lids);
	return rc;
	}

	/****************
	* List all records of a public key
	*/
	static int
	list_records( ulong lid )
	{
	int rc;
	TRUSTREC dr, ur, rec;
	ulong recno;

	rc = tdbio_read_record( lid, &dr, RECTYPE_DIR );
	if( rc ) {
	log_error("lid %lu: read dir record failed: %s\n", lid, g10_errstr(rc));
	return rc;
	}
	tdbio_dump_record( &dr, stdout );

	for( recno=dr.r.dir.keylist; recno; recno = rec.r.key.next ) {
	rc = tdbio_read_record( recno, &rec, RECTYPE_KEY );
	if( rc ) {
	log_error("lid %lu: read key record failed: %s\n",
	lid, g10_errstr(rc));
	return rc;
	}
	tdbio_dump_record( &rec, stdout );
	}

	for( recno=dr.r.dir.uidlist; recno; recno = ur.r.uid.next ) {
	rc = tdbio_read_record( recno, &ur, RECTYPE_UID );
	if( rc ) {
	log_error("lid %lu: read uid record failed: %s\n",
	lid, g10_errstr(rc));
	return rc;
	}
	tdbio_dump_record( &ur, stdout );
	/* preference records */
	for(recno=ur.r.uid.prefrec; recno; recno = rec.r.pref.next ) {
	rc = tdbio_read_record( recno, &rec, RECTYPE_PREF );
	if( rc ) {
	log_error("lid %lu: read pref record failed: %s\n",
	lid, g10_errstr(rc));
	return rc;
	}
	tdbio_dump_record( &rec, stdout );
	}
	/* sig records */
	for(recno=ur.r.uid.siglist; recno; recno = rec.r.sig.next ) {
	rc = tdbio_read_record( recno, &rec, RECTYPE_SIG );
	if( rc ) {
	log_error("lid %lu: read sig record failed: %s\n",
	lid, g10_errstr(rc));
	return rc;
	}
	tdbio_dump_record( &rec, stdout );
	}
	}

	/* add cache record dump here */



	return rc;
	}



	/****************
	* Function to collect all trustpaths
	*/
	static int
	do_list_path( TRUST_INFO *stack, int depth, int max_depth,
	LOCAL_ID_INFO lids, TRUST_SEG_LIST tslist )
	{
	SIGREC_CONTEXT sx;
	unsigned last_depth;
	int rc;

	assert(depth);

	/printf("%2lu/%d: scrutinizig\n", stack[depth-1], depth);/
	if( depth >= max_depth \|\| depth >= MAX_LIST_SIGS_DEPTH-1 ) {
	/printf("%2lu/%d: too deeply nested\n", stack[depth-1], depth);/
	return 0;
	}
	memset( &sx, 0, sizeof sx );
	sx.lid = stack[depth-1].lid;
	/* loop over all signatures. If we do not have any, try to create them */
	while( !(rc = walk_sigrecs( &sx, 1 )) ) {
	TRUST_SEG_LIST tsl, t2, tl;
	int i;

	stack[depth].lid = sx.sig_lid;
	stack[depth].trust = 0;
	if( qry_lid_table_flag( lids, sx.sig_lid, &last_depth) ) {
	/printf("%2lu/%d: marked\n", sx.sig_lid, depth );/
	ins_lid_table_item( lids, sx.sig_lid, depth);
	last_depth = depth;
	}
	else if( depth < last_depth ) {
	/printf("%2lu/%d: last_depth=%u - updated\n", sx.sig_lid, depth, last_depth);/
	last_depth = depth;
	upd_lid_table_flag( lids, sx.sig_lid, depth);
	}

	if( last_depth < depth )
	/printf("%2lu/%d: already visited\n", sx.sig_lid, depth)/;
	else if( !qry_lid_table_flag( ultikey_table, sx.sig_lid, NULL ) ) {
	/* found end of path; store it, ordered by path length */
	tsl = m_alloc( sizeof tsl + depthsizeof(TRUST_INFO) );
	tsl->nseg = depth+1;
	tsl->dup = 0;
	for(i=0; i <= depth; i++ )
	tsl->seg[i] = stack[i];
	for(t2=*tslist,tl=NULL; t2; tl=t2, t2 = t2->next )
	if( depth < t2->nseg )
	break;
	if( !tl ) {
	tsl->next = t2;
	*tslist = tsl;
	}
	else {
	tsl->next = t2;
	tl->next = tsl;
	}
	/putchar('.'); fflush(stdout);/
	/printf("%2lu/%d: found\n", sx.sig_lid, depth);/
	}
	else {
	rc = do_list_path( stack, depth+1, max_depth, lids, tslist);
	if( rc && rc != -1 )
	break;
	}
	}
	return rc==-1? 0 : rc;
	}


	/****************
	* find the uid record given the uid packet and the dir-record.
	* Returns: 0 = found
	* -1 = No such uid-record
	* or other error
	*/
	static int
	find_urec( TRUSTREC dir, PKT_user_id uid, TRUSTREC *urec )
	{
	byte nhash[20];
	ulong recno;
	int rc;

	assert(dir->rectype == RECTYPE_DIR );
	rmd160_hash_buffer( nhash, uid->name, uid->len );
	for( recno=dir->r.dir.uidlist; recno; recno = urec->r.uid.next ) {
	rc = tdbio_read_record( recno, urec, RECTYPE_UID );
	if( rc )
	return rc == -1 ? G10ERR_READ_FILE : rc;
	if( !memcmp( nhash, urec->r.uid.namehash, 20 ) )
	return 0;
	}

	return -1;
	}


	/****************
	* Test whether zthe signature lid is already in the (in mem) list.
	* Returns: True if it is a duplicate
	*/
	static int
	test_dupsig( TRUSTREC *rec, ulong lid )
	{
	int i;
	ulong alid;

	for( ; rec; rec = rec->next ) {
	for(i=0; i < SIGS_PER_RECORD && (alid = rec->r.sig.sig[i].lid); i++ )
	if( alid == lid )
	return 1;
	}
	return 0;
	}


	/****************
	* release the sigrec from the uidlist
	*/
	static void
	rel_uidsigs( TRUSTREC *urec )
	{
	TRUSTREC r2, rec;
	assert( urec->rectype == RECTYPE_UID );

	for(rec=urec->next ; rec; rec = r2 ) {
	assert( rec->rectype == RECTYPE_SIG );
	r2 = rec->next;
	m_free( rec );
	}
	urec->next = NULL;
	}

	static int
	no_selfsig_del( ulong lid, u32 keyid, TRUSTREC urec )
	{
	int rc;

	log_error("key %08lX.%lu, uid %02X%02X: "
	"no self-signature - user id removed\n",
	(ulong)keyid[1], lid, urec->r.uid.namehash[18],
	urec->r.uid.namehash[19] );
	rel_uidsigs( urec );
	rc = tdbio_delete_uidrec( lid, urec->recnum );
	if( rc )
	log_error("no_selfsig_del: delete_uid %lu failed: %s\n",
	lid, g10_errstr(rc) );
	return rc;
	}

	/****************
	* Write the signature records from the in-mem list at urec
	* (The sequence of signatures does not matter)
	*/
	static int
	write_sigs_from_urec( ulong lid, u32 keyid, TRUSTREC urec )
	{
	int rc;
	TRUSTREC *rec, srec;
	ulong nextrecno;
	ulong recno;

	nextrecno = urec->r.uid.siglist;
	urec->r.uid.siglist = 0; /* end of list marker */
	for( rec = urec->next; rec; rec = rec->next ) {
	assert( rec->rectype == RECTYPE_SIG );
	if( nextrecno ) { /* read the sig record, so it can be reused */
	rc = tdbio_read_record( nextrecno, &srec, RECTYPE_SIG );
	if( rc ) {
	log_error("write_sig_from_urec: read sigrecno %lu failed: %s\n",
	nextrecno, g10_errstr(rc) );
	return rc;
	}
	recno = nextrecno;
	nextrecno = srec.r.sig.next;
	}
	else
	recno = tdbio_new_recnum();

	/* link together (the sequence of signatures does not matter) */
	rec->r.sig.next = urec->r.uid.siglist;
	urec->r.uid.siglist = recno;
	rec->r.sig.lid = lid;
	/* and write */
	rec->recnum = recno;
	rc = tdbio_write_record( rec );
	if( rc ) {
	log_error("write_sig_from_urec: write sigrecno %lu failed: %s\n",
	recno, g10_errstr(rc) );
	return rc;
	}
	}

	/* write the urec back */
	rc = tdbio_write_record( urec );
	if( rc ) {
	log_error("write_sig_from_urec: write urec %lu failed: %s\n",
	urec->recnum, g10_errstr(rc) );
	return rc;
	}

	/* delete remaining old sigrecords */
	while( nextrecno ) {
	rc = tdbio_read_record( nextrecno, &srec, RECTYPE_SIG );
	if( rc ) {
	log_error("write_sig_from_urec: read sigrecno %lu failed: %s\n",
	nextrecno, g10_errstr(rc) );
	return rc;
	}
	rc = tdbio_delete_record( nextrecno );
	if( rc ) {
	log_error("write_sig_from_urec: delete old %lu failed: %s\n",
	nextrecno, g10_errstr(rc) );
	return rc;

	}
	nextrecno = srec.r.sig.next;
	}

	return rc;
	}

	/****************
	* If we do not have sigrecs for the given key, build them and write them
	* to the trustdb
	*/
	static int
	update_sigs( TRUSTREC *dir )
	{
	TRUSTREC *rec, krec;
	TRUSTREC urec;
	TRUSTREC *sigrec_list;
	KBNODE keyblock = NULL;
	KBNODE node;
	int i, sigidx, have_urec ;
	ulong lid = dir->r.dir.lid;
	u32 keyid[2];
	int miskey=0;
	int rc=0;

	if( DBG_TRUST )
	log_debug("update_sigs for %lu\n", lid );

	if( (rc=tdbio_read_record( dir->r.dir.keylist, &krec, RECTYPE_KEY )) ) {
	log_error("update_sigs: can't read primary key for %lu\n", lid);
	goto leave;
	}
	rc = get_keyblock_byfprint( &keyblock, krec.r.key.fingerprint,
	krec.r.key.fingerprint_len );
	if( rc ) {
	log_error( "update_sigs: keyblock for %lu not found: %s\n",
	lid, g10_errstr(rc) );
	goto leave;
	}

	/* check all key signatures */
	assert( keyblock->pkt->pkttype == PKT_PUBLIC_KEY );
	have_urec = 0;
	sigrec_list = NULL;
	sigidx = 0;
	for( node=keyblock; node; node = node->next ) {
	if( node->pkt->pkttype == PKT_PUBLIC_KEY )
	keyid_from_pk( node->pkt->pkt.public_key, keyid );
	else if( node->pkt->pkttype == PKT_USER_ID ) {
	if( have_urec && !(urec.mark & 1) ) {
	if( (rc = no_selfsig_del(lid, keyid, &urec )) )
	goto leave;
	have_urec = 0;
	}
	if( have_urec ) {
	rc = write_sigs_from_urec( lid, keyid, &urec );
	if( rc )
	goto leave;
	rel_uidsigs( &urec );
	}
	rc = find_urec( dir, node->pkt->pkt.user_id, &urec );
	urec.next = NULL;
	urec.mark = 0;
	have_urec = sigidx = 0;
	if( rc == -1 ) {
	log_info("update_sigs: new user id for %lu\n", lid );
	/* fixme: we should add the new user id here */
	}
	else if( rc ) {
	log_error("update_sigs: find_urec %lu failed: %s\n",
	lid, g10_errstr(rc) );
	goto leave;
	}
	else
	have_urec = 1;
	}
	else if( have_urec && node->pkt->pkttype == PKT_SIGNATURE ) {
	PKT_signature *sig = node->pkt->pkt.signature;

	if( (sig->sig_class&~3) == 0x10 ) {
	rc = check_key_signature( keyblock, node, &i );
	if( rc == G10ERR_NO_PUBKEY ) {
	log_info("key %08lX.%lu, uid %02X%02X: "
	"no public key for signature %08lX\n",
	(ulong)keyid[1], lid, urec.r.uid.namehash[18],
	urec.r.uid.namehash[19], (ulong)sig->keyid[1] );
	miskey = 1;
	}
	else if( rc )
	log_error("key %08lX.%lu, uid %02X%02X: "
	"invalid %ssignature: %s\n",
	(ulong)keyid[1], lid, urec.r.uid.namehash[18],
	urec.r.uid.namehash[19],
	i?"self-":"",g10_errstr(rc));
	else if( i ) /* mark that we have a valid selfsignature */
	urec.mark \|= 1;
	else if( (rc = set_signature_packets_lid( sig )) )
	log_error("key %08lX.%lu, uid %02X%02X: "
	"can't get LID of signer: %s\n",
	(ulong)keyid[1], lid, urec.r.uid.namehash[18],
	urec.r.uid.namehash[19], g10_errstr(rc));
	else if( !test_dupsig( urec.next, sig->local_id ) ) {
	/* put the valid signature into a list */
	rec = urec.next;
	if( !rec \|\| sigidx == SIGS_PER_RECORD ) {
	rec = m_alloc_clear( sizeof *rec );
	rec->rectype = RECTYPE_SIG;
	rec->next = urec.next;
	urec.next = rec;
	sigidx = 0;
	}
	rec->r.sig.sig[sigidx].lid = sig->local_id;
	rec->r.sig.sig[sigidx].flag = 0;
	sigidx++;
	if( DBG_TRUST )
	log_debug("key %08lX.%lu, uid %02X%02X: "
	"signed by LID %lu\n",
	(ulong)keyid[1], lid, urec.r.uid.namehash[18],
	urec.r.uid.namehash[19], sig->local_id);
	}
	else if( DBG_TRUST )
	log_debug("key %08lX.%lu, uid %02X%02X: "
	"duplicate signature by LID %lu\n",
	(ulong)keyid[1], lid, urec.r.uid.namehash[18],
	urec.r.uid.namehash[19], sig->local_id );
	rc = 0;
	}
	else {
	/* fixme: handle other sig classes here */
	/* FIXME: Revocations!!! */
	}
	}
	}
	if( have_urec && !(urec.mark & 1) ) {
	if( (rc = no_selfsig_del(lid, keyid, &urec )) )
	goto leave;
	have_urec = 0;
	}
	if( have_urec ) {
	rc = write_sigs_from_urec( lid, keyid, &urec );
	if( rc )
	goto leave;
	rel_uidsigs( &urec );
	}
	dir->r.dir.dirflags \|= DIRF_CHECKED;
	if( miskey )
	dir->r.dir.dirflags \|= DIRF_MISKEY;
	else
	dir->r.dir.dirflags &= ~DIRF_MISKEY;
	rc = tdbio_write_record( dir );
	if( rc ) {
	log_error("update_sigs: write dir record failed: %s\n", g10_errstr(rc));
	return rc;
	}

	leave:
	/* fixme: need more cleanup in case of an error */
	release_kbnode( keyblock );
	if( DBG_TRUST )
	log_debug("update_sigs for %lu: %s\n", lid, g10_errstr(rc) );
	return rc;
	}


	static int
	update_sigs_by_lid( ulong lid )
	{
	int rc;
	TRUSTREC rec;

	rc = tdbio_read_record( lid, &rec, RECTYPE_DIR );
	if( rc ) {
	log_error("LID %lu: error reading dir record: %s\n",
	lid, g10_errstr(rc));
	return rc;
	}
	if( !(rec.r.dir.dirflags & DIRF_CHECKED) )
	rc = update_sigs( &rec );
	return rc;
	}

	/****************
	* Make a list of trust paths
	*/
	static int
	make_tsl( ulong lid, TRUST_SEG_LIST *ret_tslist )
	{
	int i, rc;
	LOCAL_ID_INFO *lids = new_lid_table();
	TRUST_INFO stack[MAX_LIST_SIGS_DEPTH];
	TRUST_SEG_LIST tsl, tslist;
	int max_depth = 4;

	tslist = *ret_tslist = NULL;

	if( !qry_lid_table_flag( ultikey_table, lid, NULL ) ) {
	tslist = m_alloc( sizeof *tslist );
	tslist->nseg = 1;
	tslist->dup = 0;
	tslist->seg[0].lid = lid;
	tslist->seg[0].trust = 0;
	tslist->next = NULL;
	rc = 0;
	}
	else {
	stack[0].lid = lid;
	stack[0].trust = 0;
	rc = do_list_path( stack, 1, max_depth, lids, &tslist );
	}
	if( !rc ) { /* wipe out duplicates */
	LOCAL_ID_INFO *work = new_lid_table();
	for( tsl=tslist; tsl; tsl = tsl->next ) {
	for(i=1; i < tsl->nseg-1; i++ ) {
	if( ins_lid_table_item( work, tsl->seg[i].lid, 0 ) ) {
	tsl->dup = 1; /* mark as duplicate */
	break;
	}
	}
	}
	release_lid_table(work);
	*ret_tslist = tslist;
	}
	else
	; /* FIXME: release tslist */
	release_lid_table(lids);
	return rc;
	}


	/****************
	* Given a trust segment list tslist, walk over all paths and fill in
	* the trust information for each segment. What this function does is
	* to assign a trustvalue to the first segment (which is the requested key)
	* of each path.
	*
	* FIXME: We have to do more thinking here. e.g. we should never increase
	* the trust value.
	*
	* Do not do it for duplicates.
	*/
	static int
	propagate_trust( TRUST_SEG_LIST tslist )
	{
	int i, rc;
	unsigned trust, tr;
	TRUST_SEG_LIST tsl;

	for(tsl = tslist; tsl; tsl = tsl->next ) {
	if( tsl->dup )
	continue;
	assert( tsl->nseg );
	/* the last segment is always an ultimately trusted one, so we can
	* assign a fully trust to the next one */
	i = tsl->nseg-1;
	tsl->seg[i].trust = TRUST_ULTIMATE;
	trust = TRUST_FULLY;
	for(i-- ; i >= 0; i-- ) {
	tsl->seg[i].trust = trust;
	if( i > 0 ) {
	/* get the trust of this pubkey */
	rc = get_ownertrust( tsl->seg[i].lid, &tr );
	if( rc )
	return rc;
	if( tr < trust )
	trust = tr;
	}
	}
	}
	return 0;
	}


	/****************
	* we have the pubkey record and all needed informations are in the trustdb
	* but nothing more is known.
	* (this function may re-read the dir record dr)
	*/
	static int
	do_check( TRUSTREC dr, unsigned trustlevel )
	{
	int i, rc=0;
	TRUST_SEG_LIST tsl, tsl2, tslist;
	int marginal, fully;
	int fully_needed = opt.completes_needed;
	int marginal_needed = opt.marginals_needed;
	unsigned tflags = 0;

	assert( fully_needed > 0 && marginal_needed > 1 );


	*trustlevel = TRUST_UNDEFINED;

	if( !dr->r.dir.keylist ) {
	log_error("Ooops, no keys\n");
	return G10ERR_TRUSTDB;
	}
	if( !dr->r.dir.uidlist ) {
	log_error("Ooops, no user ids\n");
	return G10ERR_TRUSTDB;
	}

	/* did we already check the signatures */
	if( !(dr->r.dir.dirflags & DIRF_CHECKED) ) /* no - do it now */
	rc = update_sigs( dr );

	if( dr->r.dir.dirflags & DIRF_REVOKED )
	tflags \|= TRUST_FLAG_REVOKED;

	#if 0
	if( !rc && !dr->r.dir.siglist ) {
	/* We do not have any signatures; check whether it is one of our
	* secret keys */
	if( !qry_lid_table_flag( ultikey_table, dr->r.dir.lid, NULL ) )
	*trustlevel = tflags \| TRUST_ULTIMATE;
	return 0;
	}
	#endif
	if( rc )
	return rc; /* error while looking for sigrec or building sigrecs */

	/* fixme: take it from the cache if it is valid */

	/* Make a list of all possible trust-paths */
	rc = make_tsl( dr->r.dir.lid, &tslist );
	if( rc )
	return rc;
	rc = propagate_trust( tslist );
	if( rc )
	return rc;
	for(tsl = tslist; tsl; tsl = tsl->next ) {
	if( tsl->dup )
	continue;

	if( opt.verbose ) {
	log_info("trust path:" );
	for(i=0; i < tsl->nseg; i++ ) {
	putc(' ',stderr);
	print_keyid( stderr, tsl->seg[i].lid );
	putc(':',stderr);
	print_trust( stderr, tsl->seg[i].trust );
	}
	putc('\n',stderr);
	}
	}

	/* and see whether there is a trusted path.
	* We only have to look at the first segment, because
	* propagate_trust has investigated all other segments */
	marginal = fully = 0;
	for(tsl = tslist; tsl; tsl = tsl->next ) {
	if( tsl->dup )
	continue;
	if( tsl->seg[0].trust == TRUST_ULTIMATE ) {
	trustlevel = tflags \| TRUST_ULTIMATE; / our own key */
	break;
	}
	if( tsl->seg[0].trust == TRUST_FULLY ) {
	marginal++;
	fully++;
	}
	else if( tsl->seg[0].trust == TRUST_MARGINAL )
	marginal++;

	if( fully >= fully_needed ) {
	*trustlevel = tflags \| TRUST_FULLY;
	break;
	}
	}
	if( !tsl && marginal >= marginal_needed )
	*trustlevel = tflags \| TRUST_MARGINAL;

	/* cache the tslist */
	if( last_trust_web_key ) {
	for( tsl = last_trust_web_tslist; tsl; tsl = tsl2 ) {
	tsl2 = tsl->next;
	m_free(tsl);
	}
	}
	last_trust_web_key = dr->r.dir.lid;
	last_trust_web_tslist = tslist;
	return 0;
	}


	/***********************************************
	************** API **********************
	***********************************************/

	/****************
	* Perform some checks over the trustdb
	* level 0: only open the db
	* 1: used for initial program startup
	*/
	int
	init_trustdb( int level, const char *dbname )
	{
	int rc=0;

	if( !ultikey_table )
	ultikey_table = new_lid_table();

	if( !level \|\| level==1 ) {
	rc = tdbio_set_dbname( dbname, !!level );
	if( rc )
	return rc;
	if( !level )
	return 0;

	/* verify that our own keys are in the trustDB
	* or move them to the trustdb. */
	rc = verify_own_keys();

	/* should we check whether there is no other ultimately trusted
	* key in the database? */

	}
	else
	BUG();

	return rc;
	}


	void
	list_trustdb( const char *username )
	{
	TRUSTREC rec;

	if( username && *username == '#' ) {
	int rc;
	ulong lid = atoi(username+1);

	if( (rc = list_records( lid)) )
	log_error("user '%s' read problem: %s\n", username, g10_errstr(rc));
	else if( (rc = list_sigs( lid )) )
	log_error("user '%s' list problem: %s\n", username, g10_errstr(rc));
	}
	else if( username ) {
	PKT_public_key pk = m_alloc_clear( sizeof pk );
	int rc;

	if( (rc = get_pubkey_byname( pk, username )) )
	log_error("user '%s' not found: %s\n", username, g10_errstr(rc) );
	else if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 )
	log_error("problem finding '%s' in trustdb: %s\n",
	username, g10_errstr(rc));
	else if( rc == -1 )
	log_error("user '%s' not in trustdb\n", username);
	else if( (rc = list_records( pk->local_id)) )
	log_error("user '%s' read problem: %s\n", username, g10_errstr(rc));
	else if( (rc = list_sigs( pk->local_id )) )
	log_error("user '%s' list problem: %s\n", username, g10_errstr(rc));
	free_public_key( pk );
	}
	else {
	ulong recnum;
	int i;

	printf("TrustDB: %s\n", tdbio_get_dbname() );
	for(i=9+strlen(tdbio_get_dbname()); i > 0; i-- )
	putchar('-');
	putchar('\n');
	for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ )
	tdbio_dump_record( &rec, stdout );
	}
	}

	/****************
	* Print a list of all defined owner trust value.
	*/
	void
	export_ownertrust()
	{
	TRUSTREC rec;
	TRUSTREC rec2;
	ulong recnum;
	int i;
	byte *p;
	int rc;

	for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ ) {
	if( rec.rectype == RECTYPE_DIR ) {
	if( !rec.r.dir.keylist ) {
	log_error("Oops; directory record w/o primary key\n");
	continue;
	}
	if( !rec.r.dir.ownertrust )
	continue;
	rc = tdbio_read_record( rec.r.dir.keylist, &rec2, RECTYPE_KEY);
	if( rc ) {
	log_error("error reading key record: %s\n", g10_errstr(rc));
	continue;
	}
	p = rec2.r.key.fingerprint;
	for(i=0; i < rec2.r.key.fingerprint_len; i++, p++ )
	printf("%02X", *p );
	printf(":%u:\n", (unsigned)rec.r.dir.ownertrust );
	}
	}
	}


	void
	import_ownertrust( const char *fname )
	{
	FILE *fp;
	int is_stdin=0;
	char line[256];
	char *p;
	size_t n, fprlen;
	unsigned otrust;

	if( !fname \|\| (*fname == '-' && !fname[1]) ) {
	fp = stdin;
	fname = "[stdin]";
	is_stdin = 1;
	}
	else if( !(fp = fopen( fname, "r" )) ) {
	log_error_f(fname, _("can't open file: %s\n"), strerror(errno) );
	return;
	}

	while( fgets( line, DIM(line)-1, fp ) ) {
	TRUSTREC rec;
	int rc;

	if( !line \|\| line == '#' )
	continue;
	n = strlen(line);
	if( line[n-1] != '\n' ) {
	log_error_f(fname, "line to long\n" );
	break; /* can't continue */
	}
	for(p = line; p && p != ':' ; p++ )
	if( !isxdigit(*p) )
	break;
	if( *p != ':' ) {
	log_error_f(fname, "error: missing colon\n" );
	continue;
	}
	fprlen = p - line;
	if( fprlen != 32 && fprlen != 40 ) {
	log_error_f(fname, "error: invalid fingerprint\n" );
	continue;
	}
	if( sscanf(p, ":%u:", &otrust ) != 1 ) {
	log_error_f(fname, "error: no otrust value\n" );
	continue;
	}
	if( !otrust )
	continue; /* no otrust defined - no need to update or insert */
	/* convert the ascii fingerprint to binary */
	for(p=line, fprlen=0; *p != ':'; p += 2 )
	line[fprlen++] = HEXTOBIN(p[0]) * 16 + HEXTOBIN(p[1]);
	line[fprlen] = 0;

	repeat:
	rc = tdbio_search_dir_byfpr( line, fprlen, 0, &rec );
	if( !rc ) { /* found: update */
	if( rec.r.dir.ownertrust )
	log_info("LID %lu: changing trust from %u to %u\n",
	rec.r.dir.lid, rec.r.dir.ownertrust, otrust );
	else
	log_info("LID %lu: setting trust to %u\n",
	rec.r.dir.lid, otrust );
	rec.r.dir.ownertrust = otrust;
	rc = tdbio_write_record( &rec );
	if( rc )
	log_error_f(fname, "error updating otrust: %s\n",
	g10_errstr(rc));
	}
	else if( rc == -1 ) { /* not found; get the key from the ring */
	PKT_public_key pk = m_alloc_clear( sizeof pk );

	log_info_f(fname, "key not in trustdb, searching ring.\n");
	rc = get_pubkey_byfprint( pk, line, fprlen );
	if( rc )
	log_info_f(fname, "key not in ring: %s\n", g10_errstr(rc));
	else {
	rc = query_trust_record( pk ); /* only as assertion */
	if( rc != -1 )
	log_error_f(fname, "Oops: key is now in trustdb???\n");
	else {
	rc = insert_trust_record( pk );
	if( !rc )
	goto repeat; /* update the ownertrust */
	log_error_f(fname, "insert trust record failed: %s\n",
	g10_errstr(rc) );
	}
	}
	}
	else /* error */
	log_error_f(fname, "error finding dir record: %s\n",
	g10_errstr(rc));
	}
	if( ferror(fp) )
	log_error_f(fname, _("read error: %s\n"), strerror(errno) );
	if( !is_stdin )
	fclose(fp);
	}


	void
	list_trust_path( int max_depth, const char *username )
	{
	int rc;
	int wipe=0;
	int i;
	TRUSTREC rec;
	PKT_public_key pk = m_alloc_clear( sizeof pk );

	if( max_depth < 0 ) {
	wipe = 1;
	max_depth = -max_depth;
	}

	if( (rc = get_pubkey_byname( pk, username )) )
	log_error("user '%s' not found: %s\n", username, g10_errstr(rc) );
	else if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 )
	log_error("problem finding '%s' in trustdb: %s\n",
	username, g10_errstr(rc));
	else if( rc == -1 ) {
	log_info("user '%s' not in trustdb - inserting\n", username);
	rc = insert_trust_record( pk );
	if( rc )
	log_error("failed to put '%s' into trustdb: %s\n", username, g10_errstr(rc));
	else {
	assert( pk->local_id );
	}
	}

	if( !rc ) {
	TRUST_SEG_LIST tsl, tslist = NULL;

	if( !qry_lid_table_flag( ultikey_table, pk->local_id, NULL ) ) {
	tslist = m_alloc( sizeof *tslist );
	tslist->nseg = 1;
	tslist->dup = 0;
	tslist->seg[0].lid = pk->local_id;
	tslist->seg[0].trust = 0;
	tslist->next = NULL;
	rc = 0;
	}
	else {
	LOCAL_ID_INFO *lids = new_lid_table();
	TRUST_INFO stack[MAX_LIST_SIGS_DEPTH];

	stack[0].lid = pk->local_id;
	stack[0].trust = 0;
	rc = do_list_path( stack, 1, max_depth, lids, &tslist );
	if( wipe ) { /* wipe out duplicates */
	LOCAL_ID_INFO *work;

	work = new_lid_table();
	for( tsl=tslist; tsl; tsl = tsl->next ) {
	for(i=1; i < tsl->nseg-1; i++ ) {
	if( ins_lid_table_item( work, tsl->seg[i].lid, 0 ) ) {
	tsl->dup = 1; /* mark as duplicate */
	break;
	}
	}
	}
	release_lid_table(work);
	}
	release_lid_table(lids);
	}
	if( rc )
	log_error("user '%s' list problem: %s\n", username, g10_errstr(rc));
	rc = propagate_trust( tslist );
	if( rc )
	log_error("user '%s' trust problem: %s\n", username, g10_errstr(rc));
	for(tsl = tslist; tsl; tsl = tsl->next ) {
	int i;

	if( tsl->dup )
	continue;
	printf("trust path:" );
	for(i=0; i < tsl->nseg; i++ ) {
	putc(' ',stdout);
	print_keyid( stdout, tsl->seg[i].lid );
	putc(':',stdout);
	print_trust( stdout, tsl->seg[i].trust );
	}
	putchar('\n');
	}
	}

	free_public_key( pk );
	}


	/****************
	* Check the complete trustdb or only the entries for the given username
	*/
	void
	check_trustdb( const char *username )
	{
	TRUSTREC rec;
	int rc;

	if( username && *username == '#' ) {
	int rc;
	ulong lid = atoi(username+1);

	if( (rc = update_sigs_by_lid( lid )) )
	log_error("lid %lu: check failed: %s\n",
	lid, g10_errstr(rc));
	else
	log_info("lid %lu: checked: %s\n", lid, g10_errstr(rc));
	}
	else if( username ) {
	PKT_public_key pk = m_alloc_clear( sizeof pk );

	if( (rc = get_pubkey_byname( pk, username )) )
	log_error("user '%s' not found: %s\n", username, g10_errstr(rc) );
	else if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 )
	log_error("problem finding '%s' in trustdb: %s\n",
	username, g10_errstr(rc));
	else if( rc == -1 )
	log_error("user '%s' not in trustdb\n", username);
	else if( (rc = update_sigs( &rec )) )
	log_error("lid %lu: check failed: %s\n",
	rec.recnum, g10_errstr(rc));
	else
	log_info("lid %lu: checked: %s\n", rec.recnum, g10_errstr(rc));
	free_public_key( pk );
	}
	else {
	ulong recnum;

	for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ ) {
	if( rec.rectype == RECTYPE_DIR ) {
	rc = update_sigs( &rec );
	if( rc )
	log_error("lid %lu: check failed: %s\n",
	recnum, g10_errstr(rc) );
	else
	log_info("lid %lu: checked\n", recnum );
	}
	}
	}
	}

	/****************
	* Get the trustlevel for this PK.
	* Note: This does not ask any questions
	* Returns: 0 okay of an errorcode
	*
	* It operates this way:
	* locate the pk in the trustdb
	* found:
	* Do we have a valid cache record for it?
	* yes: return trustlevel from cache
	* no: make a cache record and all the other stuff
	* not found:
	* try to insert the pubkey into the trustdb and check again
	*
	* Problems: How do we get the complete keyblock to check that the
	* cache record is actually valid? Think we need a clever
	* cache in getkey.c to keep track of this stuff. Maybe it
	* is not necessary to check this if we use a local pubring. Hmmmm.
	*/
	int
	check_trust( PKT_public_key pk, unsigned r_trustlevel )
	{
	TRUSTREC rec;
	unsigned trustlevel = TRUST_UNKNOWN;
	int rc=0;
	u32 cur_time;
	u32 keyid[2];


	keyid_from_pk( pk, keyid );

	/* get the pubkey record */
	if( pk->local_id ) {
	if( tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ) ) {
	log_error("check_trust: read dir record failed\n");
	return G10ERR_TRUSTDB;
	}
	}
	else { /* no local_id: scan the trustdb */
	if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 ) {
	log_error("check_trust: search dir record failed: %s\n",
	g10_errstr(rc));
	return rc;
	}
	else if( rc == -1 ) { /* not found - insert */
	rc = insert_trust_record( pk );
	if( rc ) {
	log_error(_("key %08lX: insert trust record failed: %s\n"),
	keyid[1], g10_errstr(rc));
	goto leave;
	}
	log_info(_("key %08lX.%lu: inserted into trustdb\n"),
	keyid[1], pk->local_id );
	/* and re-read the dir record */
	if( tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ) ) {
	log_error("check_trust: reread dir record failed\n");
	return G10ERR_TRUSTDB;
	}
	}
	}
	cur_time = make_timestamp();
	if( pk->timestamp > cur_time ) {
	log_info(_("key %08lX.%lu: created in future "
	"(time warp or clock problem)\n"),
	keyid[1], pk->local_id );
	return G10ERR_TIME_CONFLICT;
	}

	if( pk->valid_days && add_days_to_timestamp(pk->timestamp,
	pk->valid_days) < cur_time ) {
	log_info(_("key %08lX.%lu: expired at %s\n"),
	keyid[1], pk->local_id,
	asctimestamp( add_days_to_timestamp(pk->timestamp,
	pk->valid_days)));
	trustlevel = TRUST_EXPIRED;
	}
	else {
	rc = do_check( &rec, &trustlevel );
	if( rc ) {
	log_error(_("key %08lX.%lu: trust check failed: %s\n"),
	keyid[1], pk->local_id, g10_errstr(rc));
	return rc;
	}
	}


	leave:
	if( DBG_TRUST )
	log_debug("check_trust() returns trustlevel %04x.\n", trustlevel);
	*r_trustlevel = trustlevel;
	return 0;
	}


	int
	query_trust_info( PKT_public_key *pk )
	{
	unsigned trustlevel;
	int c;

	if( check_trust( pk, &trustlevel ) )
	return '?';
	if( trustlevel & TRUST_FLAG_REVOKED )
	return 'r';
	switch( (trustlevel & TRUST_MASK) ) {
	case TRUST_UNKNOWN: c = 'o'; break;
	case TRUST_EXPIRED: c = 'e'; break;
	case TRUST_UNDEFINED: c = 'q'; break;
	case TRUST_NEVER: c = 'n'; break;
	case TRUST_MARGINAL: c = 'm'; break;
	case TRUST_FULLY: c = 'f'; break;
	case TRUST_ULTIMATE: c = 'u'; break;
	default: BUG();
	}
	return c;
	}



	/****************
	* Enumerate all keys, which are needed to build all trust paths for
	* the given key. This function does not return the key itself or
	* the ultimate key.
	*
	* 1) create a void pointer and initialize it to NULL
	* 2) pass this void pointer by reference to this function.
	* Set lid to the key you want to enumerate and pass it by reference.
	* 3) call this function as long as it does not return -1
	* to indicate EOF. LID does contain the next key used to build the web
	* 4) Always call this function a last time with LID set to NULL,
	* so that it can free its context.
	*/
	int
	enum_trust_web( void *context, ulong lid )
	{
	ENUM_TRUST_WEB_CONTEXT c = context;

	if( !c ) { /* make a new context */
	c = m_alloc_clear( sizeof *c );
	*context = c;
	if( *lid == last_trust_web_key && last_trust_web_tslist )
	c->tsl = last_trust_web_tslist;
	else {
	TRUST_SEG_LIST tsl, tsl2, tslist;
	int rc;

	rc = make_tsl( *lid, &tslist );
	if( rc ) {
	log_error("failed to build the TSL\n");
	return rc;
	}
	/* cache the tslist, so that we do not need to free it */
	if( last_trust_web_key ) {
	for( tsl = last_trust_web_tslist; tsl; tsl = tsl2 ) {
	tsl2 = tsl->next;
	m_free(tsl);
	}
	}
	last_trust_web_key = *lid;
	last_trust_web_tslist = tslist;
	c->tsl = last_trust_web_tslist;
	}
	c->index = 1;
	}

	if( !lid ) { /* free the context */
	m_free( c );
	*context = NULL;
	return 0;
	}

	while( c->tsl ) {
	if( !c->tsl->dup && c->index < c->tsl->nseg-1 ) {
	*lid = c->tsl->seg[c->index].lid;
	c->index++;
	return 0;
	}
	c->index = 1;
	c->tsl = c->tsl->next;
	}
	return -1; /* eof */
	}


	/****************
	* Return the assigned ownertrust value for the given LID
	*/
	int
	get_ownertrust( ulong lid, unsigned *r_otrust )
	{
	TRUSTREC rec;

	if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
	log_error("get_ownertrust: read dir record failed\n");
	return G10ERR_TRUSTDB;
	}
	if( r_otrust )
	*r_otrust = rec.r.dir.ownertrust;
	return 0;
	}

	int
	get_ownertrust_info( ulong lid )
	{
	unsigned otrust;
	int c;

	if( get_ownertrust( lid, &otrust ) )
	return '?';
	switch( (otrust & TRUST_MASK) ) {
	case TRUST_NEVER: c = 'n'; break;
	case TRUST_MARGINAL: c = 'm'; break;
	case TRUST_FULLY: c = 'f'; break;
	case TRUST_ULTIMATE: c = 'u'; break;
	default: c = '-'; break;
	}
	return c;
	}


	byte *
	get_pref_data( ulong lid, const byte namehash, size_t ret_n )
	{
	TRUSTREC rec;
	ulong recno;
	int rc;

	if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
	log_error("get_pref_data: read dir record failed\n");
	return NULL;
	}

	for( recno=rec.r.dir.uidlist; recno; recno = rec.r.uid.next ) {
	rc = tdbio_read_record( recno, &rec, RECTYPE_UID );
	if( rc ) {
	log_error("get_pref_data: read uid record failed: %s\n",
	g10_errstr(rc));
	return NULL;
	}
	if( rec.r.uid.prefrec
	&& ( !namehash \|\| !memcmp(namehash, rec.r.uid.namehash, 20) )) {
	byte *buf;
	/* found the correct one or the first one */
	rc = tdbio_read_record( rec.r.uid.prefrec, &rec, RECTYPE_PREF );
	if( rc ) {
	log_error("get_pref_data: read pref record failed: %s\n",
	g10_errstr(rc));
	return NULL;
	}
	if( rec.r.pref.next )
	log_info("warning: can't yet handle long pref records\n");
	buf = m_alloc( ITEMS_PER_PREF_RECORD );
	memcpy( buf, rec.r.pref.data, ITEMS_PER_PREF_RECORD );
	*ret_n = ITEMS_PER_PREF_RECORD;
	return buf;
	}
	}
	return NULL;
	}



	/****************
	* Check whether the algorithm is in one of the pref records
	*/
	int
	is_algo_in_prefs( ulong lid, int preftype, int algo )
	{
	TRUSTREC rec;
	ulong recno;
	int i, rc;
	byte *pref;

	if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
	log_error("is_algo_in_prefs: read dir record failed\n");
	return 0;
	}

	for( recno=rec.r.dir.uidlist; recno; recno = rec.r.uid.next ) {
	rc = tdbio_read_record( recno, &rec, RECTYPE_UID );
	if( rc ) {
	log_error("is_algo_in_prefs: read uid record failed: %s\n",
	g10_errstr(rc));
	return 0;
	}
	if( rec.r.uid.prefrec ) {
	rc = tdbio_read_record( rec.r.uid.prefrec, &rec, RECTYPE_PREF );
	if( rc ) {
	log_error("is_algo_in_prefs: read pref record failed: %s\n",
	g10_errstr(rc));
	return 0;
	}
	if( rec.r.pref.next )
	log_info("warning: can't yet handle long pref records\n");
	pref = rec.r.pref.data;
	for(i=0; i+1 < ITEMS_PER_PREF_RECORD; i+=2 ) {
	if( pref[i] == preftype && pref[i+1] == algo )
	return 1;
	}
	}
	}
	return 0;
	}


	/****************
	* This function simply looks for the key in the trustdb
	* and makes sure that pk->local_id is set to the coreect value.
	* Return: 0 = found
	* -1 = not found
	* other = error
	*/
	int
	query_trust_record( PKT_public_key *pk )
	{
	TRUSTREC rec;
	int rc=0;

	if( pk->local_id ) {
	if( tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ) ) {
	log_error("query_trust_record: read record failed\n");
	return G10ERR_TRUSTDB;
	}
	}
	else { /* no local_id: scan the trustdb */
	if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 ) {
	log_error("query_trust_record: search_record failed: %s\n",
	g10_errstr(rc));
	return rc;
	}
	}
	return rc;
	}


	int
	clear_trust_checked_flag( PKT_public_key *pk )
	{
	TRUSTREC rec;
	int rc;

	if( !pk->local_id ) {
	query_trust_record( pk );
	if( !pk->local_id )
	log_bug("clear_trust_checked_flag: Still no LID\n");
	}

	if( (rc=tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ))) {
	log_error("clear_trust_checked_flag: read record failed: %s\n",
	g10_errstr(rc));
	return rc;
	}

	if( !(rec.r.dir.dirflags & DIRF_CHECKED) )
	return 0;

	/* reset the flag */
	rec.r.dir.dirflags &= ~DIRF_CHECKED;
	rc = tdbio_write_record( &rec );
	if( rc ) {
	log_error("clear_trust_checked_flag: write dir record failed: %s\n",
	g10_errstr(rc));
	return rc;
	}
	return 0;
	}


	/****************
	* helper function for insert_trust_record()
	*/
	static void
	rel_mem_uidnode( u32 keyid, int err, TRUSTREC rec )
	{
	TRUSTREC r, r2;

	if( err )
	log_error("key %08lX, uid %02X%02X: invalid user id - removed\n",
	(ulong)keyid[1], rec->r.uid.namehash[18], rec->r.uid.namehash[19] );
	for(r=rec->help_pref; r; r = r2 ) {
	r2 = r->next;
	m_free(r);
	}

	m_free(rec);
	}


	/****************
	* Insert a trust record into the TrustDB
	* This function fails if this record already exists.
	*
	* We build everything we can do at this point. We cannot build
	* the sig records, because their LIDs are needed and we may not have them.
	*/
	int
	insert_trust_record( PKT_public_key *orig_pk )
	{
	TRUSTREC dirrec, rec, rec2;
	TRUSTREC keylist_head, keylist_tail, keylist;
	TRUSTREC uidlist_head, uidlist_tail, uidlist;
	KBNODE keyblock = NULL;
	KBNODE node;
	u32 keyid[2]; /* of primary key */
	byte *fingerprint;
	size_t fingerlen;
	int rc = 0;

	keylist_head = NULL; keylist_tail = &keylist_head; keylist = NULL;
	uidlist_head = NULL; uidlist_tail = &uidlist_head; uidlist = NULL;

	/* prepare dir record */
	memset( &dirrec, 0, sizeof dirrec );
	dirrec.rectype = RECTYPE_DIR;

	if( orig_pk->local_id )
	log_bug("pk->local_id=%lu\n", (ulong)orig_pk->local_id );

	fingerprint = fingerprint_from_pk( orig_pk, NULL, &fingerlen );

	/* fixme: assert that we do not have this record.
	* we can do this by searching for the primary keyid
	*/

	/* get the keyblock which has the key */
	rc = get_keyblock_byfprint( &keyblock, fingerprint, fingerlen );
	if( rc ) { /* that should never happen */
	log_error( "insert_trust_record: keyblock not found: %s\n",
	g10_errstr(rc) );
	goto leave;
	}

	/* build data structure as linked lists in memory */
	keyid[0] = keyid[1] = 0;
	for( node=keyblock; node; node = node->next ) {
	if( node->pkt->pkttype == PKT_PUBLIC_KEY
	\|\| node->pkt->pkttype == PKT_PUBLIC_SUBKEY ) {
	PKT_public_key *pk = node->pkt->pkt.public_key;

	if( node->pkt->pkttype == PKT_PUBLIC_KEY ) {
	if( keylist_head )
	BUG(); /* more than one primary key */
	keyid_from_pk( pk, keyid );
	}
	fingerprint = fingerprint_from_pk( pk, NULL, &fingerlen );
	rec = m_alloc_clear( sizeof *rec );
	rec->rectype = RECTYPE_KEY;
	rec->r.key.pubkey_algo = pk->pubkey_algo;
	rec->r.key.fingerprint_len = fingerlen;
	memcpy(rec->r.key.fingerprint, fingerprint, fingerlen );

	*keylist_tail = rec; keylist_tail = &rec->next;
	}
	else if( node->pkt->pkttype == PKT_USER_ID ) {
	PKT_user_id *uid = node->pkt->pkt.user_id;

	rec = m_alloc_clear( sizeof *rec );
	rec->rectype = RECTYPE_UID;
	rmd160_hash_buffer( rec->r.uid.namehash, uid->name, uid->len );

	uidlist = rec;
	*uidlist_tail = rec; uidlist_tail = &rec->next;
	}
	else if( node->pkt->pkttype == PKT_SIGNATURE ) {
	PKT_signature *sig = node->pkt->pkt.signature;

	if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1]
	&& (node->pkt->pkt.signature->sig_class&~3) == 0x10 ) {
	/* must verify this selfsignature here, so that we can
	* build the preference record and validate the uid record
	*/
	if( !uidlist ) {
	log_error("key %08lX: self-signature without user id\n",
	(ulong)keyid[1] );
	}
	else if( (rc = check_key_signature( keyblock, node, NULL ))) {
	log_error("key %08lX, uid %02X%02X: "
	"invalid self-signature: %s\n",
	(ulong)keyid[1], uidlist->r.uid.namehash[18],
	uidlist->r.uid.namehash[19], g10_errstr(rc) );
	rc = 0;
	}
	else { /* build the prefrecord */
	static struct {
	sigsubpkttype_t subpkttype;
	int preftype;
	} prefs[] = {
	{ SIGSUBPKT_PREF_SYM, PREFTYPE_SYM },
	{ SIGSUBPKT_PREF_HASH, PREFTYPE_HASH },
	{ SIGSUBPKT_PREF_COMPR, PREFTYPE_COMPR },
	{ 0, 0 }
	};
	const byte *s;
	size_t n;
	int k, i;
	assert(uidlist);
	assert(!uidlist->help_pref);
	uidlist->mark \|= 1; /* mark valid */

	i = 0;
	for(k=0; prefs[k].subpkttype; k++ ) {
	s = parse_sig_subpkt2( sig, prefs[k].subpkttype, &n );
	if( s ) {
	while( n ) {
	if( !i \|\| i >= ITEMS_PER_PREF_RECORD ) {
	rec = m_alloc_clear( sizeof *rec );
	rec->rectype = RECTYPE_PREF;
	rec->next = uidlist->help_pref;
	uidlist->help_pref = rec;
	i = 0;
	}
	rec->r.pref.data[i++] = prefs[k].preftype;
	rec->r.pref.data[i++] = *s++;
	n--;
	}
	}
	}
	}
	}
	else if( 0 /* is revocation sig etc */ ) {
	/* handle it here */
	}
	else { /* not a selfsignature */
	}
	}
	}

	/* delete all invalid marked userids and their preferences and sigs */
	/* (ugly code - I know) */
	while( (rec=uidlist_head) && !(rec->mark & 1) ) {
	uidlist_head = rec->next;
	rel_mem_uidnode(keyid, 1, rec);
	}
	for( ; rec; rec = rec->next ) {
	if( rec->next && !(rec->next->mark & 1) ) {
	TRUSTREC *r = rec->next;
	rec->next = r->next;
	rel_mem_uidnode(keyid, 1, r);
	}
	}

	/* check that we have at least one userid */
	if( !uidlist_head ) {
	log_error("key %08lX: no user ids - rejected\n", (ulong)keyid[1] );
	rc = G10ERR_BAD_CERT;
	goto leave;
	}

	/* insert the record numbers to build the real (on disk) list */
	/* fixme: should start a transaction here */
	dirrec.recnum = tdbio_new_recnum();
	dirrec.r.dir.lid = dirrec.recnum;
	/* (list of keys) */
	for(rec=keylist_head; rec; rec = rec->next ) {
	rec->r.key.lid = dirrec.recnum;
	rec->recnum = tdbio_new_recnum();
	}
	for(rec=keylist_head; rec; rec = rec->next )
	rec->r.key.next = rec->next? rec->next->recnum : 0;
	dirrec.r.dir.keylist = keylist_head->recnum;
	/* (list of user ids) */
	for(rec=uidlist_head; rec; rec = rec->next ) {
	rec->r.uid.lid = dirrec.recnum;
	rec->recnum = tdbio_new_recnum();
	/* (preference records) */
	if( rec->help_pref ) {
	for( rec2 = rec->help_pref; rec2; rec2 = rec2->next ) {
	rec2->r.pref.lid = dirrec.recnum;
	rec2->recnum = tdbio_new_recnum();
	}
	for( rec2 = rec->help_pref; rec2->next; rec2 = rec2->next )
	rec2->next->r.pref.next = rec2->recnum;
	rec->r.uid.prefrec = rec2->recnum;
	}
	}
	for(rec=uidlist_head; rec; rec = rec->next )
	rec->r.uid.next = rec->next? rec->next->recnum : 0;
	dirrec.r.dir.uidlist = uidlist_head->recnum;

	/* write all records */
	for(rec=keylist_head; rec; rec = rec->next ) {
	assert( rec->rectype == RECTYPE_KEY );
	if( tdbio_write_record( rec ) ) {
	log_error("writing key record failed\n");
	rc = G10ERR_TRUSTDB;
	goto leave;
	}
	}
	for(rec=uidlist_head; rec; rec = rec->next ) {
	assert( rec->rectype == RECTYPE_UID );
	if( tdbio_write_record( rec ) ) {
	log_error("writing uid record failed\n");
	rc = G10ERR_TRUSTDB;
	goto leave;
	}
	for( rec2=rec->help_pref; rec2; rec2 = rec2->next ) {
	assert( rec2->rectype == RECTYPE_PREF );
	if( tdbio_write_record( rec2 ) ) {
	log_error("writing pref record failed\n");
	rc = G10ERR_TRUSTDB;
	goto leave;
	}
	}
	}
	if( tdbio_write_record( &dirrec ) ) {
	log_error("writing dir record failed\n");
	return G10ERR_TRUSTDB;
	}

	/* and store the LID */
	orig_pk->local_id = dirrec.r.dir.lid;
	for( node=keyblock; node; node = node->next ) {
	if( node->pkt->pkttype == PKT_PUBLIC_KEY
	\|\| node->pkt->pkttype == PKT_PUBLIC_SUBKEY ) {
	PKT_public_key *pk = node->pkt->pkt.public_key;
	pk->local_id = dirrec.r.dir.lid;
	}
	else if( node->pkt->pkttype == PKT_SIGNATURE ) {
	PKT_signature *sig = node->pkt->pkt.signature;
	sig->local_id = dirrec.r.dir.lid;
	}
	}


	leave:
	for(rec=uidlist_head; rec; rec = rec2 ) {
	rec2 = rec->next;
	rel_mem_uidnode(NULL, 0, rec );
	}
	for(rec=keylist_head; rec; rec = rec2 ) {
	rec2 = rec->next;
	m_free(rec);
	}

	return rc;
	}


	int
	update_ownertrust( ulong lid, unsigned new_trust )
	{
	TRUSTREC rec;

	if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
	log_error("update_ownertrust: read dir failed\n");
	return G10ERR_TRUSTDB;
	}
	rec.r.dir.ownertrust = new_trust;
	if( tdbio_write_record( &rec ) ) {
	log_error("update_ownertrust: write failed\n");
	return G10ERR_TRUSTDB;
	}
	return 0;
	}

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