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gnupg/g10/import.c

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/* import.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 <assert.h>
#include "options.h"
#include "packet.h"
#include "errors.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "trustdb.h"
#include "main.h"
static int read_block( IOBUF a, compress_filter_context_t *cfx,
PACKET **pending_pkt, KBNODE *ret_root );
static int import_one( const char *fname, KBNODE keyblock );
static int import_revoke_cert( const char *fname, KBNODE node );
static int chk_self_sigs( const char *fname, KBNODE keyblock,
PKT_public_cert *pkc, u32 *keyid );
static int delete_inv_parts( const char *fname, KBNODE keyblock, u32 *keyid );
static int merge_blocks( const char *fname, KBNODE keyblock_orig,
KBNODE keyblock, u32 *keyid, int *n_uids, int *n_sigs );
static int append_uid( KBNODE keyblock, KBNODE node, int *n_sigs,
const char *fname, u32 *keyid );
static int merge_sigs( KBNODE dst, KBNODE src, int *n_sigs,
const char *fname, u32 *keyid );
/****************
* Import the public keys from the given filename. Input may be armored.
* This function rejects alls keys which are not valid self signed on at
* least one userid. Only user ids which are self signed will be imported.
* Other signatures are not not checked.
*
* Actually this functtion does a merge. It works like this:
*
* - get the keyblock
* - check self-signatures and remove all userids and their signatures
* without/invalid self-signatures.
* - reject the keyblock, if we have no valid userid.
* - See wether we have this key already in one of our pubrings.
* If not, simply add it to the default keyring.
* - Compare the key and the self-signatures of the new and the one in
* our keyring. If they are differen something weird is going on;
* ask what to do.
* - See wether we have only non-self-signature on one user id; if not
* ask the user what to do.
* - compare the signatures: If we already have this signature, check
* that they compare okay; if not, issue a warning and ask the user.
* (consider to look at the timestamp and use the newest?)
* - Simply add the signature. Can't verify here because we may not have
* the signatures public key yet; verification is done when putting it
* into the trustdb, which is done automagically as soon as this pubkey
* is used.
* - Proceed with next signature.
*
* Key revocation certificates have a special handling.
*
*/
int
import_pubkeys( const char *fname )
{
armor_filter_context_t afx;
compress_filter_context_t cfx;
PACKET *pending_pkt = NULL;
IOBUF inp = NULL;
KBNODE keyblock;
int rc = 0;
memset( &afx, 0, sizeof afx);
memset( &cfx, 0, sizeof cfx);
/* open file */
inp = iobuf_open(fname);
if( !fname )
fname = "[stdin]";
if( !inp ) {
log_error("%s: can't open file: %s\n", fname, strerror(errno) );
return G10ERR_OPEN_FILE;
}
if( !opt.no_armor ) /* armored reading is not diabled */
iobuf_push_filter( inp, armor_filter, &afx );
while( !(rc = read_block( inp, &cfx, &pending_pkt, &keyblock) )) {
if( keyblock->pkt->pkttype == PKT_PUBLIC_CERT )
rc = import_one( fname, keyblock );
else if( keyblock->pkt->pkttype == PKT_SIGNATURE
&& keyblock->pkt->pkt.signature->sig_class == 0x20 )
rc = import_revoke_cert( fname, keyblock );
else
log_info("%s: skipping block of type %d\n",
fname, keyblock->pkt->pkttype );
release_kbnode(keyblock);
if( rc )
break;
}
if( rc == -1 )
rc = 0;
else if( rc )
log_error("%s: read error: %s\n", fname, g10_errstr(rc));
iobuf_close(inp);
return rc;
}
/****************
* Read the next keyblock from stream A, CFX is used to handle
* compressed keyblocks. PENDING_PKT should be initialzed to NULL
* and not chnaged form the caller.
* Retunr: 0 = okay, -1 no more blocks or another errorcode.
*/
static int
read_block( IOBUF a, compress_filter_context_t *cfx,
PACKET **pending_pkt, KBNODE *ret_root )
{
int rc;
PACKET *pkt;
KBNODE root = NULL;
int in_cert;
if( *pending_pkt ) {
root = new_kbnode( *pending_pkt );
*pending_pkt = NULL;
in_cert = 1;
}
else
in_cert = 0;
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
while( (rc=parse_packet(a, pkt)) != -1 ) {
if( rc ) { /* ignore errors */
if( rc != G10ERR_UNKNOWN_PACKET ) {
log_error("read_block: read error: %s\n", g10_errstr(rc) );
rc = G10ERR_INV_KEYRING;
goto ready;
}
free_packet( pkt );
init_packet(pkt);
continue;
}
if( !root && pkt->pkttype == PKT_SIGNATURE
&& pkt->pkt.signature->sig_class == 0x20 ) {
/* this is a revocation certificate which is handled
* in a special way */
root = new_kbnode( pkt );
pkt = NULL;
goto ready;
}
/* make a linked list of all packets */
switch( pkt->pkttype ) {
case PKT_COMPRESSED:
if( pkt->pkt.compressed->algorithm == 1 )
cfx->pgpmode = 1;
else if( pkt->pkt.compressed->algorithm != 2 ){
rc = G10ERR_COMPR_ALGO;
goto ready;
}
pkt->pkt.compressed->buf = NULL;
iobuf_push_filter( a, compress_filter, cfx );
free_packet( pkt );
init_packet(pkt);
break;
case PKT_PUBLIC_CERT:
case PKT_SECRET_CERT:
if( in_cert ) { /* store this packet */
*pending_pkt = pkt;
pkt = NULL;
goto ready;
}
in_cert = 1;
default:
if( in_cert ) {
if( !root )
root = new_kbnode( pkt );
else
add_kbnode( root, new_kbnode( pkt ) );
pkt = m_alloc( sizeof *pkt );
}
init_packet(pkt);
break;
}
}
ready:
if( rc == -1 && root )
rc = 0;
if( rc )
release_kbnode( root );
else
*ret_root = root;
free_packet( pkt );
m_free( pkt );
return rc;
}
/****************
* Try to import one keyblock. Return an error only in serious cases, but
* never for an invalid keyblock. It uses log_error to increase the
* internal errorcount, so that invalid input can be detected by programs
* which called g10.
*/
static int
import_one( const char *fname, KBNODE keyblock )
{
PKT_public_cert *pkc;
PKT_public_cert *pkc_orig;
KBNODE node, uidnode;
KBNODE keyblock_orig = NULL;
KBPOS kbpos;
u32 keyid[2];
int rc = 0;
/* get the key and print some infos about it */
node = find_kbnode( keyblock, PKT_PUBLIC_CERT );
if( !node ) {
log_error("%s: Oops; public key not found anymore!\n", fname);
return G10ERR_GENERAL; /* really serious */
}
pkc = node->pkt->pkt.public_cert;
keyid_from_pkc( pkc, keyid );
uidnode = find_next_kbnode( keyblock, PKT_USER_ID );
if( opt.verbose ) {
log_info("%s: pub %4u%c/%08lX %s ", fname,
nbits_from_pkc( pkc ),
pubkey_letter( pkc->pubkey_algo ),
(ulong)keyid[1], datestr_from_pkc(pkc) );
if( uidnode )
print_string( stderr, uidnode->pkt->pkt.user_id->name,
uidnode->pkt->pkt.user_id->len, 0 );
putc('\n', stderr);
}
if( !uidnode ) {
log_error("%s: No user id for key %08lX\n", fname, (ulong)keyid[1]);
return 0;
}
clear_kbnode_flags( keyblock );
rc = chk_self_sigs( fname, keyblock , pkc, keyid );
if( rc )
return rc== -1? 0:rc;
if( !delete_inv_parts( fname, keyblock, keyid ) ) {
log_info("%s: key %08lX, no valid user ids\n",
fname, (ulong)keyid[1]);
return 0;
}
/* do we have this key already in one of our pubrings ? */
pkc_orig = m_alloc_clear( sizeof *pkc_orig );
rc = get_pubkey( pkc_orig, keyid );
if( rc && rc != G10ERR_NO_PUBKEY ) {
log_error("%s: key %08lX, public key not found: %s\n",
fname, (ulong)keyid[1], g10_errstr(rc));
}
else if( rc ) { /* insert this key */
/* get default resource */
if( get_keyblock_handle( NULL, 0, &kbpos ) ) {
log_error("no default public keyring\n");
return G10ERR_GENERAL;
}
if( opt.verbose > 1 )
log_info("%s: writing to '%s'\n",
fname, keyblock_resource_name(&kbpos) );
if( (rc=lock_keyblock( &kbpos )) )
log_error("can't lock public keyring '%s': %s\n",
keyblock_resource_name(&kbpos), g10_errstr(rc) );
else if( (rc=insert_keyblock( &kbpos, keyblock )) )
log_error("%s: can't write to '%s': %s\n", fname,
keyblock_resource_name(&kbpos), g10_errstr(rc) );
unlock_keyblock( &kbpos );
/* we are ready */
log_info("%s: key %08lX imported\n", fname, (ulong)keyid[1]);
}
else { /* merge */
int n_uids, n_sigs;
/* Compare the original against the new key; just to be sure nothing
* weird is going on */
if( cmp_public_certs( pkc_orig, pkc ) ) {
log_error("%s: key %08lX, doesn't match our copy\n",
fname, (ulong)keyid[1]);
rc = G10ERR_GENERAL;
goto leave;
}
/* See wether we have only non-self-signature on one user id; if not
* ask the user what to do. <--- fixme */
/* now read the original keyblock */
rc = find_keyblock_bypkc( &kbpos, pkc_orig );
if( rc ) {
log_error("%s: key %08lX, can't locate original keyblock: %s\n",
fname, (ulong)keyid[1], g10_errstr(rc));
goto leave;
}
rc = read_keyblock( &kbpos, &keyblock_orig );
if( rc ) {
log_error("%s: key %08lX, can't read original keyblock: %s\n",
fname, (ulong)keyid[1], g10_errstr(rc));
goto leave;
}
/* and try to merge the block */
clear_kbnode_flags( keyblock_orig );
clear_kbnode_flags( keyblock );
n_uids = n_sigs = 0;
rc = merge_blocks( fname, keyblock_orig, keyblock,
keyid, &n_uids, &n_sigs );
if( rc )
goto leave;
if( n_uids || n_sigs ) { /* keyblock_orig has been updated; write */
if( opt.verbose > 1 )
log_info("%s: writing to '%s'\n",
fname, keyblock_resource_name(&kbpos) );
if( (rc=lock_keyblock( &kbpos )) )
log_error("can't lock public keyring '%s': %s\n",
keyblock_resource_name(&kbpos), g10_errstr(rc) );
else if( (rc=update_keyblock( &kbpos, keyblock )) )
log_error("%s: can't write to '%s': %s\n", fname,
keyblock_resource_name(&kbpos), g10_errstr(rc) );
unlock_keyblock( &kbpos );
/* we are ready */
if( n_uids == 1 )
log_info("%s: key %08lX, 1 new user-id\n",
fname, (ulong)keyid[1]);
else if( n_uids )
log_info("%s: key %08lX, %d new user-ids\n",
fname, (ulong)keyid[1], n_uids );
if( n_sigs == 1 )
log_info("%s: key %08lX, 1 new signature\n",
fname, (ulong)keyid[1]);
else if( n_sigs )
log_info("%s: key %08lX, %d new signatures\n",
fname, (ulong)keyid[1], n_sigs );
}
else
log_info("%s: key %08lX, not changed\n", fname, (ulong)keyid[1] );
}
leave:
release_kbnode( keyblock_orig );
free_public_cert( pkc_orig );
return rc;
}
/****************
* Import a revocation certificate, this is a single signature packet.
*/
static int
import_revoke_cert( const char *fname, KBNODE node )
{
PKT_public_cert *pkc=NULL;
KBNODE onode, keyblock = NULL;
KBPOS kbpos;
u32 keyid[2];
int rc = 0;
assert( !node->next );
assert( node->pkt->pkttype == PKT_SIGNATURE );
assert( node->pkt->pkt.signature->sig_class == 0x20 );
keyid[0] = node->pkt->pkt.signature->keyid[0];
keyid[1] = node->pkt->pkt.signature->keyid[1];
pkc = m_alloc_clear( sizeof *pkc );
rc = get_pubkey( pkc, keyid );
if( rc == G10ERR_NO_PUBKEY ) {
log_info("%s: key %08lX, no public key - "
"can't apply revocation certificate\n",
fname, (ulong)keyid[1]);
rc = 0;
goto leave;
}
else if( rc ) {
log_error("%s: key %08lX, public key not found: %s\n",
fname, (ulong)keyid[1], g10_errstr(rc));
goto leave;
}
/* read the original keyblock */
rc = find_keyblock_bypkc( &kbpos, pkc );
if( rc ) {
log_error("%s: key %08lX, can't locate original keyblock: %s\n",
fname, (ulong)keyid[1], g10_errstr(rc));
goto leave;
}
rc = read_keyblock( &kbpos, &keyblock );
if( rc ) {
log_error("%s: key %08lX, can't read original keyblock: %s\n",
fname, (ulong)keyid[1], g10_errstr(rc));
goto leave;
}
/* it is okay, that node is not in keyblock because
* check_key_signature works fine for sig_class 0x20 in this
* special case. */
rc = check_key_signature( keyblock, node, NULL);
if( rc ) {
log_error("%s: key %08lX, invalid revocation certificate"
": %s - rejected\n",
fname, (ulong)keyid[1], g10_errstr(rc));
}
/* check wether we already have this */
for(onode=keyblock->next; onode; onode=onode->next ) {
if( onode->pkt->pkttype == PKT_USER_ID )
break;
else if( onode->pkt->pkttype == PKT_SIGNATURE
&& onode->pkt->pkt.signature->sig_class == 0x20
&& keyid[0] == onode->pkt->pkt.signature->keyid[0]
&& keyid[1] == onode->pkt->pkt.signature->keyid[1] ) {
rc = 0;
goto leave; /* yes, we already know about it */
}
}
/* insert it */
insert_kbnode( keyblock, clone_kbnode(node), 0 );
/* and write the keyblock back */
if( opt.verbose > 1 )
log_info("%s: writing to '%s'\n",
fname, keyblock_resource_name(&kbpos) );
if( (rc=lock_keyblock( &kbpos )) )
log_error("can't lock public keyring '%s': %s\n",
keyblock_resource_name(&kbpos), g10_errstr(rc) );
else if( (rc=update_keyblock( &kbpos, keyblock )) )
log_error("%s: can't write to '%s': %s\n", fname,
keyblock_resource_name(&kbpos), g10_errstr(rc) );
unlock_keyblock( &kbpos );
/* we are ready */
log_info("%s: key %08lX, added revocation certificate\n",
fname, (ulong)keyid[1]);
leave:
release_kbnode( keyblock );
free_public_cert( pkc );
return rc;
}
/****************
* loop over the keyblock an check all self signatures.
* Mark all user-ids with a self-signature by setting flag bit 0.
* Mark all user-ids with an invalid self-signature by setting bit 1.
*/
static int
chk_self_sigs( const char *fname, KBNODE keyblock,
PKT_public_cert *pkc, u32 *keyid )
{
KBNODE n, unode;
PKT_signature *sig;
int rc;
for( n=keyblock; (n = find_next_kbnode(n, 0)); ) {
if( n->pkt->pkttype != PKT_SIGNATURE )
continue;
sig = n->pkt->pkt.signature;
if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1] ) {
unode = find_prev_kbnode( keyblock, n, PKT_USER_ID );
if( !unode ) {
log_error("%s: key %08lX, no user-id for signature\n",
fname, (ulong)keyid[1]);
return -1; /* the complete keyblock is invalid */
}
rc = check_key_signature( keyblock, n, NULL);
if( rc ) {
log_error("%s: key %08lX, invalid self-signature\n",
fname, (ulong)keyid[1]);
unode->flag |= 2; /* mark as invalid */
}
unode->flag |= 1; /* mark that user-id checked */
}
}
return 0;
}
/****************
* delete all parts which are invalidand those signatures whos
* public key algorithm is not availabe in this implemenation;
* but consider RSA as valid, because parse/build_packets knows
* about it.
* returns: true if at least one valid user-id is left over.
*/
static int
delete_inv_parts( const char *fname, KBNODE keyblock, u32 *keyid )
{
KBNODE node;
int nvalid=0, uid_seen=0;
for(node=keyblock->next; node; node = node->next ) {
if( node->pkt->pkttype == PKT_USER_ID ) {
uid_seen = 1;
if( (node->flag & 2) || !(node->flag & 1) ) {
if( opt.verbose ) {
log_info("%s: key %08lX, removed userid '",
fname, (ulong)keyid[1]);
print_string( stderr, node->pkt->pkt.user_id->name,
node->pkt->pkt.user_id->len, 0 );
fputs("'\n", stderr );
}
delete_kbnode( node ); /* the user-id */
/* and all following packets up to the next user-id */
while( node->next && node->next->pkt->pkttype != PKT_USER_ID ){
delete_kbnode( node->next );
node = node->next;
}
}
else
nvalid++;
}
else if( node->pkt->pkttype == PKT_SIGNATURE
&& check_pubkey_algo( node->pkt->pkt.signature->pubkey_algo)
&& node->pkt->pkt.signature->pubkey_algo != PUBKEY_ALGO_RSA )
delete_kbnode( node ); /* build_packet() can't handle this */
else if( node->pkt->pkttype == PKT_SIGNATURE
&& node->pkt->pkt.signature->sig_class == 0x20 ) {
if( uid_seen ) {
log_error("%s: key %08lX, revocation certificate at wrong "
"place - removed\n", fname, (ulong)keyid[1]);
delete_kbnode( node );
}
else {
int rc = check_key_signature( keyblock, node, NULL);
if( rc ) {
log_error("%s: key %08lX, invalid revocation certificate"
": %s - removed\n",
fname, (ulong)keyid[1], g10_errstr(rc));
delete_kbnode( node );
}
}
}
}
/* note: because keyblock is the public key, it is never marked
* for deletion and so keyblock cannot change */
commit_kbnode( &keyblock );
return nvalid;
}
/****************
* compare and merge the blocks
*
* o compare the signatures: If we already have this signature, check
* that they compare okay; if not, issue a warning and ask the user.
* FIXME: add the check, that we don` have duplicate signatures and the
* warning in cases that the old/new signatures don't match.
* o Simply add the signature. Can't verify here because we may not have
* the signatures public key yet; verification is done when putting it
* into the trustdb, which is done automagically as soon as this pubkey
* is used.
* Note: We indicate newly inserted packets with flag bit 0
*/
static int
merge_blocks( const char *fname, KBNODE keyblock_orig, KBNODE keyblock,
u32 *keyid, int *n_uids, int *n_sigs )
{
KBNODE onode, node;
int rc, found;
/* 1st: handle revocation certificates */
for(node=keyblock->next; node; node=node->next ) {
if( node->pkt->pkttype == PKT_USER_ID )
break;
else if( node->pkt->pkttype == PKT_SIGNATURE
&& node->pkt->pkt.signature->sig_class == 0x20 ) {
/* check wether we already have this */
found = 0;
for(onode=keyblock_orig->next; onode; onode=onode->next ) {
if( onode->pkt->pkttype == PKT_USER_ID )
break;
else if( onode->pkt->pkttype == PKT_SIGNATURE
&& onode->pkt->pkt.signature->sig_class == 0x20
&& node->pkt->pkt.signature->keyid[0]
== onode->pkt->pkt.signature->keyid[0]
&& node->pkt->pkt.signature->keyid[1]
== onode->pkt->pkt.signature->keyid[1] ) {
found = 1;
break;
}
}
if( !found ) {
KBNODE n2 = clone_kbnode(node);
insert_kbnode( keyblock_orig, n2, 0 );
n2->flag |= 1;
node->flag |= 1;
log_info("%s: key %08lX, added revocation certificate\n",
fname, (ulong)keyid[1]);
}
}
}
/* 2nd: try to merge new ones in */
for(onode=keyblock_orig->next; onode; onode=onode->next ) {
if( !(onode->flag & 1) && onode->pkt->pkttype == PKT_USER_ID) {
/* find the user id in the imported keyblock */
for(node=keyblock->next; node; node=node->next )
if( !(node->flag & 1)
&& node->pkt->pkttype == PKT_USER_ID
&& !cmp_user_ids( onode->pkt->pkt.user_id,
node->pkt->pkt.user_id ) )
break;
if( node ) { /* found: merge */
rc = merge_sigs( onode, node, n_sigs, fname, keyid );
if( rc )
return rc;
}
}
}
/* 3rd: add new user-ids */
for(node=keyblock->next; node; node=node->next ) {
if( !(node->flag & 1) && node->pkt->pkttype == PKT_USER_ID) {
/* do we have this in the original keyblock */
for(onode=keyblock_orig->next; onode; onode=onode->next )
if( !(onode->flag & 1)
&& onode->pkt->pkttype == PKT_USER_ID
&& cmp_user_ids( onode->pkt->pkt.user_id,
node->pkt->pkt.user_id ) )
break;
if( !node ) { /* this is a new user id: append */
rc = append_uid( keyblock_orig, node, n_sigs, fname, keyid);
if( rc )
return rc;
++*n_uids;
}
}
}
return 0;
}
/****************
* append the userid starting with NODE and all signatures to KEYBLOCK.
* Mark all new and copied packets by setting flag bit 0.
*/
static int
append_uid( KBNODE keyblock, KBNODE node, int *n_sigs,
const char *fname, u32 *keyid )
{
KBNODE n;
assert(node->pkt->pkttype == PKT_USER_ID );
/* at lease a self signature comes next to the user-id */
if( node->next->pkt->pkttype == PKT_USER_ID ) {
log_error("%s: key %08lX, our copy has no self-signature\n",
fname, (ulong)keyid[1]);
return G10ERR_GENERAL;
}
for( ;node && node->pkt->pkttype != PKT_USER_ID; node = node->next ) {
/* we add a clone to the original keyblock, because this
* one is released first */
n = clone_kbnode(node);
add_kbnode( keyblock, n );
node->flag |= 1;
n->flag |= 1;
if( n->pkt->pkttype == PKT_SIGNATURE )
++*n_sigs;
}
return 0;
}
/****************
* Merge the sigs from SRC onto DST. SRC and DST are both a PKT_USER_ID.
* (how should we handle comment packets here?)
*/
static int
merge_sigs( KBNODE dst, KBNODE src, int *n_sigs,
const char *fname, u32 *keyid )
{
KBNODE n, n2;
int found=0;
assert(dst->pkt->pkttype == PKT_USER_ID );
assert(src->pkt->pkttype == PKT_USER_ID );
/* at least a self signature comes next to the user-ids */
assert(src->next->pkt->pkttype != PKT_USER_ID );
if( dst->next->pkt->pkttype == PKT_USER_ID ) {
log_error("%s: key %08lX, our copy has no self-signature\n",
fname, (ulong)keyid[1]);
return 0;
}
for(n=src->next; n && n->pkt->pkttype != PKT_USER_ID; n = n->next ) {
if( n->pkt->pkttype != PKT_SIGNATURE )
continue;
found = 0;
for(n2=dst->next; n2 && n2->pkt->pkttype != PKT_USER_ID; n2 = n2->next)
if( n2->pkt->pkttype == PKT_SIGNATURE
&& n->pkt->pkt.signature->keyid[0]
== n2->pkt->pkt.signature->keyid[0]
&& n->pkt->pkt.signature->keyid[1]
== n2->pkt->pkt.signature->keyid[1] ) {
found++;
break;
}
if( found ) { /* we already have this signature */
/* Hmmm: should we compare the timestamp etc?
* but then we have first to see wether this signature is valid
* - or - simply add it in such a case and let trustdb logic
* decide wether to remove the old one
*/
continue;
}
/* This signature is new, append N to DST it.
* We add a clone to the original keyblock, because this
* one is released first */
n2 = clone_kbnode(n);
insert_kbnode( dst, n2, PKT_USER_ID );
n2->flag |= 1;
n->flag |= 1;
++*n_sigs;
}
return 0;
}
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