removed isakmpd

1 files changed, 0 insertions, 1799 deletions

diff --git a/keyexchange/isakmpd-20041012/exchange.c b/keyexchange/isakmpd-20041012/exchange.c
deleted file mode 100644
index 1c4ef1f..0000000
--- a/keyexchange/isakmpd-20041012/exchange.c
+++ /dev/null
@@ -1,1799 +0,0 @@
-/* $OpenBSD: exchange.c,v 1.104 2004/09/17 13:53:08 ho Exp $	 */
-/* $EOM: exchange.c,v 1.143 2000/12/04 00:02:25 angelos Exp $	 */
-
-/*
- * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist.  All rights reserved.
- * Copyright (c) 1999, 2001 Angelos D. Keromytis.  All rights reserved.
- * Copyright (c) 1999, 2000, 2002 Håkan Olsson.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/*
- * This code was written under funding by Ericsson Radio Systems.
- */
-
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "sysdep.h"
-
-#include "cert.h"
-#include "conf.h"
-#include "connection.h"
-#include "constants.h"
-#include "cookie.h"
-#include "crypto.h"
-#include "doi.h"
-#include "exchange.h"
-#include "ipsec_num.h"
-#include "isakmp.h"
-#ifdef USE_ISAKMP_CFG
-#include "isakmp_cfg.h"
-#endif
-#include "libcrypto.h"
-#include "log.h"
-#include "message.h"
-#include "timer.h"
-#include "transport.h"
-#include "ipsec.h"
-#include "sa.h"
-#include "util.h"
-#include "key.h"
-
-/* Initial number of bits from the cookies used as hash.  */
-#define INITIAL_BUCKET_BITS 6
-
-/*
- * Don't try to use more bits than this as a hash.
- * We only XOR 16 bits so going above that means changing the code below
- * too.
- */
-#define MAX_BUCKET_BITS 16
-
-#ifdef USE_DEBUG
-static void     exchange_dump(char *, struct exchange *);
-#endif
-static void     exchange_free_aux(void *);
-#if 0
-static void     exchange_resize(void);
-#endif
-static struct exchange *exchange_lookup_active(char *, int);
-
-static
-LIST_HEAD(exchange_list, exchange) *exchange_tab;
-
-/* Works both as a maximum index and a mask.  */
-static int      bucket_mask;
-
-/*
- * Validation scripts used to test messages for correct content of
- * payloads depending on the exchange type.
- */
-int16_t script_base[] = {
-	ISAKMP_PAYLOAD_SA,	/* Initiator -> responder.  */
-	ISAKMP_PAYLOAD_NONCE,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_SA,	/* Responder -> initiator.  */
-	ISAKMP_PAYLOAD_NONCE,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_KEY_EXCH,	/* Initiator -> responder.  */
-	ISAKMP_PAYLOAD_ID,
-	EXCHANGE_SCRIPT_AUTH,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_KEY_EXCH,	/* Responder -> initiator.  */
-	ISAKMP_PAYLOAD_ID,
-	EXCHANGE_SCRIPT_AUTH,
-	EXCHANGE_SCRIPT_END
-};
-
-int16_t script_identity_protection[] = {
-	ISAKMP_PAYLOAD_SA,	/* Initiator -> responder.  */
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_SA,	/* Responder -> initiator.  */
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_KEY_EXCH,	/* Initiator -> responder.  */
-	ISAKMP_PAYLOAD_NONCE,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_KEY_EXCH,	/* Responder -> initiator.  */
-	ISAKMP_PAYLOAD_NONCE,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_ID,	/* Initiator -> responder.  */
-	EXCHANGE_SCRIPT_AUTH,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_ID,	/* Responder -> initiator.  */
-	EXCHANGE_SCRIPT_AUTH,
-	EXCHANGE_SCRIPT_END
-};
-
-int16_t script_authentication_only[] = {
-	ISAKMP_PAYLOAD_SA,	/* Initiator -> responder.  */
-	ISAKMP_PAYLOAD_NONCE,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_SA,	/* Responder -> initiator.  */
-	ISAKMP_PAYLOAD_NONCE,
-	ISAKMP_PAYLOAD_ID,
-	EXCHANGE_SCRIPT_AUTH,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_ID,	/* Initiator -> responder.  */
-	EXCHANGE_SCRIPT_AUTH,
-	EXCHANGE_SCRIPT_END
-};
-
-#ifdef USE_AGGRESSIVE
-int16_t script_aggressive[] = {
-	ISAKMP_PAYLOAD_SA,	/* Initiator -> responder.  */
-	ISAKMP_PAYLOAD_KEY_EXCH,
-	ISAKMP_PAYLOAD_NONCE,
-	ISAKMP_PAYLOAD_ID,
-	EXCHANGE_SCRIPT_SWITCH,
-	ISAKMP_PAYLOAD_SA,	/* Responder -> initiator.  */
-	ISAKMP_PAYLOAD_KEY_EXCH,
-	ISAKMP_PAYLOAD_NONCE,
-	ISAKMP_PAYLOAD_ID,
-	EXCHANGE_SCRIPT_AUTH,
-	EXCHANGE_SCRIPT_SWITCH,
-	EXCHANGE_SCRIPT_AUTH,	/* Initiator -> responder.  */
-	EXCHANGE_SCRIPT_END
-};
-#endif				/* USE_AGGRESSIVE */
-
-int16_t script_informational[] = {
-	EXCHANGE_SCRIPT_INFO,	/* Initiator -> responder.  */
-	EXCHANGE_SCRIPT_END
-};
-
-/*
- * Check what exchange SA is negotiated with and return a suitable validation
- * script.
- */
-int16_t *
-exchange_script(struct exchange *exchange)
-{
-	switch (exchange->type) {
-	case ISAKMP_EXCH_BASE:
-		return script_base;
-	case ISAKMP_EXCH_ID_PROT:
-		return script_identity_protection;
-	case ISAKMP_EXCH_AUTH_ONLY:
-		return script_authentication_only;
-#ifdef USE_AGGRESSIVE
-	case ISAKMP_EXCH_AGGRESSIVE:
-		return script_aggressive;
-#endif
-	case ISAKMP_EXCH_INFO:
-		return script_informational;
-#ifdef USE_ISAKMP_CFG
-	case ISAKMP_EXCH_TRANSACTION:
-		return script_transaction;
-#endif
-	default:
-		if (exchange->type >= ISAKMP_EXCH_DOI_MIN &&
-		    exchange->type <= ISAKMP_EXCH_DOI_MAX)
-			return exchange->doi->exchange_script(exchange->type);
-	}
-	return 0;
-}
-
-/*
- * Validate the message MSG's contents wrt what payloads the exchange type
- * requires at this point in the dialogoue.  Return -1 if the validation fails,
- * 0 if it succeeds and the script is not finished and 1 if it's ready.
- */
-static int
-exchange_validate(struct message *msg)
-{
-	struct exchange *exchange = msg->exchange;
-	int16_t		*pc = exchange->exch_pc;
-
-	while (*pc != EXCHANGE_SCRIPT_END && *pc != EXCHANGE_SCRIPT_SWITCH) {
-		LOG_DBG((LOG_EXCHANGE, 90,
-		    "exchange_validate: checking for required %s",
-		    *pc >= ISAKMP_PAYLOAD_NONE
-		    ? constant_name(isakmp_payload_cst, *pc)
-		    : constant_name(exchange_script_cst, *pc)));
-
-		/* Check for existence of the required payloads.  */
-		if ((*pc > 0 && !payload_first(msg, *pc))
-		    || (*pc == EXCHANGE_SCRIPT_AUTH
-		    && !payload_first(msg, ISAKMP_PAYLOAD_HASH)
-		    && !payload_first(msg, ISAKMP_PAYLOAD_SIG))
-		    || (*pc == EXCHANGE_SCRIPT_INFO
-		    && ((!payload_first(msg, ISAKMP_PAYLOAD_NOTIFY)
-		    && !payload_first(msg, ISAKMP_PAYLOAD_DELETE))
-		    || (payload_first(msg, ISAKMP_PAYLOAD_DELETE)
-		    && !payload_first(msg, ISAKMP_PAYLOAD_HASH))))) {
-			/* Missing payload.  */
-			LOG_DBG((LOG_MESSAGE, 70,
-			    "exchange_validate: msg %p requires missing %s",
-			    msg, *pc >= ISAKMP_PAYLOAD_NONE
-			    ? constant_name(isakmp_payload_cst, *pc)
-			    : constant_name(exchange_script_cst, *pc)));
-			return -1;
-		}
-		pc++;
-	}
-	if (*pc == EXCHANGE_SCRIPT_END)
-		/* Cleanup.  */
-		return 1;
-
-	return 0;
-}
-
-/* Feed unhandled payloads to the DOI for handling. Help for exchange_run(). */
-static void
-exchange_handle_leftover_payloads(struct message *msg)
-{
-	struct exchange *exchange = msg->exchange;
-	struct doi	*doi = exchange->doi;
-	struct payload	*p;
-	int	i;
-
-	for (i = ISAKMP_PAYLOAD_SA; i < payload_index_max; i++) {
-		if (i == ISAKMP_PAYLOAD_PROPOSAL ||
-		    i == ISAKMP_PAYLOAD_TRANSFORM)
-			continue;
-		for (p = payload_first(msg, i); p;
-		     p = TAILQ_NEXT(p, link)) {
-			if (p->flags & PL_MARK)
-				continue;
-			if (!doi->handle_leftover_payload ||
-			    doi->handle_leftover_payload(msg, i, p))
-				LOG_DBG((LOG_EXCHANGE, 10,
-				    "exchange_run: unexpected payload %s",
-				    constant_name(isakmp_payload_cst, i)));
-		}
-	}
-}
-
-/*
- * Run the exchange script from a point given by the "program counter"
- * upto either the script's end or a transmittal of a message.  If we are
- * at the point of a reception of a message, that message should be handed
- * in here in the MSG argument.  Otherwise we are the initiator and should
- * expect MSG to be a half-cooked message without payloads.
- */
-void
-exchange_run(struct message *msg)
-{
-	struct exchange *exchange = msg->exchange;
-	struct doi	*doi = exchange->doi;
-	int             (*handler)(struct message *) = exchange->initiator ?
-	    doi->initiator : doi->responder;
-	int              done = 0;
-
-	while (!done) {
-		/*
-	         * It's our turn if we're either the initiator on an even step,
-	         * or the responder on an odd step of the dialogue.
-	         */
-		if (exchange->initiator ^ (exchange->step % 2)) {
-			done = 1;
-			if (exchange->step)
-				msg = message_alloc_reply(msg);
-			message_setup_header(msg, exchange->type, 0,
-			    exchange->message_id);
-			if (handler(msg)) {
-				/*
-				 * This can happen when transient starvation
-				 * of memory occurs.
-				 * XXX The peer's retransmit ought to
-				 * kick-start this exchange again.  If he's
-				 * stopped retransmitting he's likely dropped
-				 * the SA at his side so we need to do that
-				 * too, i.e.  implement automatic SA teardown
-				 * after a certain amount of inactivity.
-			         */
-				log_print("exchange_run: doi->%s (%p) failed",
-				    exchange->initiator ? "initiator" :
-				    "responder", msg);
-				message_free(msg);
-				return;
-			}
-			switch (exchange_validate(msg)) {
-			case 1:
-				/*
-				 * The last message of a multi-message
-				 * exchange should not be retransmitted other
-				 * than "on-demand", i.e. if we see
-				 * retransmits of the last message of the peer
-				 * later.
-			         */
-				msg->flags |= MSG_LAST;
-				if (exchange->step > 0) {
-					if (exchange->last_sent)
-						message_free(exchange->last_sent);
-					exchange->last_sent = msg;
-				}
-				/*
-				 * After we physically have sent our last
-				 * message we need to do SA-specific
-				 * finalization, like telling our application
-				 * the SA is ready to be used, or issuing a
-				 * CONNECTED notify if we set the COMMIT bit.
-			         */
-				message_register_post_send(msg,
-				    exchange_finalize);
-
-				/* Fallthrough.  */
-
-			case 0:
-				/* XXX error handling.  */
-				message_send(msg);
-				break;
-
-			default:
-				log_print("exchange_run: exchange_validate "
-				    "failed, DOI error");
-				exchange_free(exchange);
-				message_free(msg);
-				return;
-			}
-		} else {
-			done = exchange_validate(msg);
-			switch (done) {
-			case 0:
-			case 1:
-				/* Feed the message to the DOI.  */
-				if (handler(msg)) {
-					/*
-				         * Trust the peer to retransmit.
-					 * XXX We have to implement SA aging
-					 * with automatic teardown.
-				         */
-					message_free(msg);
-					return;
-				}
-				/*
-				 * Go over the yet unhandled payloads and feed
-				 * them to DOI for handling.
-			         */
-				exchange_handle_leftover_payloads(msg);
-
-				/*
-				 * We have advanced the state.  If we have
-				 * been processing an incoming message, record
-				 * that message as the one to do duplication
-				 * tests against.
-			         */
-				if (exchange->last_received)
-					message_free(exchange->last_received);
-				exchange->last_received = msg;
-				if (exchange->flags & EXCHANGE_FLAG_ENCRYPT)
-					crypto_update_iv(exchange->keystate);
-
-				if (done) {
-					exchange_finalize(msg);
-					return;
-				}
-				break;
-
-			case -1:
-				log_print("exchange_run: exchange_validate "
-				    "failed");
-				/*
-				 * XXX Is this the best error notification
-				 * type?
-				 */
-				message_drop(msg,
-				    ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1, 1);
-				return;
-			}
-		}
-
-		LOG_DBG((LOG_EXCHANGE, 40,
-		    "exchange_run: exchange %p finished step %d, advancing...",
-		    exchange, exchange->step));
-		exchange->step++;
-		while (*exchange->exch_pc != EXCHANGE_SCRIPT_SWITCH
-		    && *exchange->exch_pc != EXCHANGE_SCRIPT_END)
-			exchange->exch_pc++;
-		exchange->exch_pc++;
-	}
-}
-
-void
-exchange_init(void)
-{
-	int	i;
-
-	bucket_mask = (1 << INITIAL_BUCKET_BITS) - 1;
-	exchange_tab = malloc((bucket_mask + 1) *
-	    sizeof(struct exchange_list));
-	if (!exchange_tab)
-		log_fatal("exchange_init: out of memory");
-	for (i = 0; i <= bucket_mask; i++)
-		LIST_INIT(&exchange_tab[i]);
-}
-
-#if 0
-/* XXX Currently unused.  */
-static void
-exchange_resize(void)
-{
-	struct exchange_list *new_tab;
-	int	new_mask = (bucket_mask + 1) * 2 - 1;
-	int	i;
-
-	new_tab = realloc(exchange_tab,
-	    (new_mask + 1) * sizeof(struct exchange_list));
-	if (!new_tab)
-		return;
-	for (i = bucket_mask + 1; i <= new_mask; i++)
-		LIST_INIT(&new_tab[i]);
-	bucket_mask = new_mask;
-	/* XXX Rehash existing entries.  */
-}
-#endif
-
-/* Lookup a phase 1 exchange out of just the initiator cookie.  */
-struct exchange *
-exchange_lookup_from_icookie(u_int8_t * cookie)
-{
-	struct exchange *exchange;
-	int	i;
-
-	for (i = 0; i <= bucket_mask; i++)
-		for (exchange = LIST_FIRST(&exchange_tab[i]); exchange;
-		     exchange = LIST_NEXT(exchange, link))
-			if (memcmp(exchange->cookies, cookie,
-			    ISAKMP_HDR_ICOOKIE_LEN) == 0 &&
-			    exchange->phase == 1)
-				return exchange;
-	return 0;
-}
-
-/* Lookup an exchange out of the name and phase.  */
-struct exchange *
-exchange_lookup_by_name(char *name, int phase)
-{
-	struct exchange *exchange;
-	int	i;
-
-	/* If we search for nothing, we will find nothing.  */
-	if (!name)
-		return 0;
-
-	for (i = 0; i <= bucket_mask; i++)
-		for (exchange = LIST_FIRST(&exchange_tab[i]); exchange;
-		     exchange = LIST_NEXT(exchange, link)) {
-			LOG_DBG((LOG_EXCHANGE, 90,
-			    "exchange_lookup_by_name: %s == %s && %d == %d?",
-			    name, exchange->name ? exchange->name :
-			    "<unnamed>", phase, exchange->phase));
-
-			/*
-			 * Match by name, but don't select finished exchanges,
-			 * i.e where MSG_LAST are set in last_sent msg.
-			 */
-			if (exchange->name &&
-			    strcasecmp(exchange->name, name) == 0 &&
-			    exchange->phase == phase &&
-			    (!exchange->last_sent ||
-				(exchange->last_sent->flags & MSG_LAST) == 0))
-				return exchange;
-		}
-	return 0;
-}
-
-/* Lookup an exchange out of the name, phase and step > 1.  */
-static struct exchange *
-exchange_lookup_active(char *name, int phase)
-{
-	struct exchange *exchange;
-	int	i;
-
-	/* XXX Almost identical to exchange_lookup_by_name.  */
-
-	if (!name)
-		return 0;
-
-	for (i = 0; i <= bucket_mask; i++)
-		for (exchange = LIST_FIRST(&exchange_tab[i]); exchange;
-		    exchange = LIST_NEXT(exchange, link)) {
-			LOG_DBG((LOG_EXCHANGE, 90,
-			    "exchange_lookup_active: %s == %s && %d == %d?",
-			    name, exchange->name ? exchange->name :
-			    "<unnamed>", phase, exchange->phase));
-			if (exchange->name &&
-			    strcasecmp(exchange->name, name) == 0 &&
-			    exchange->phase == phase) {
-				if (exchange->step > 1)
-					return exchange;
-				else
-					LOG_DBG((LOG_EXCHANGE, 80,
-					    "exchange_lookup_active: avoided "
-					    "early (pre-step 1) exchange %p",
-					    exchange));
-			}
-		}
-	return 0;
-}
-
-static void
-exchange_enter(struct exchange *exchange)
-{
-	u_int16_t	bucket = 0;
-	u_int8_t       *cp;
-	int             i;
-
-	/* XXX We might resize if we are crossing a certain threshold */
-
-	for (i = 0; i < ISAKMP_HDR_COOKIES_LEN; i += 2) {
-		cp = exchange->cookies + i;
-		/* Doing it this way avoids alignment problems.  */
-		bucket ^= cp[0] | cp[1] << 8;
-	}
-	for (i = 0; i < ISAKMP_HDR_MESSAGE_ID_LEN; i += 2) {
-		cp = exchange->message_id + i;
-		/* Doing it this way avoids alignment problems.  */
-		bucket ^= cp[0] | cp[1] << 8;
-	}
-	bucket &= bucket_mask;
-	LIST_INSERT_HEAD(&exchange_tab[bucket], exchange, link);
-}
-
-/*
- * Lookup the exchange given by the header fields MSG.  PHASE2 is false when
- * looking for phase 1 exchanges and true otherwise.
- */
-struct exchange *
-exchange_lookup(u_int8_t *msg, int phase2)
-{
-	struct exchange *exchange;
-	u_int16_t       bucket = 0;
-	u_int8_t       *cp;
-	int             i;
-
-	/*
-         * We use the cookies to get bits to use as an index into exchange_tab,
-	 * as at least one (our cookie) is a good hash, xoring all the bits,
-	 * 16 at a time, and then masking, should do.  Doing it this way means
-	 * we can validate cookies very fast thus delimiting the effects of
-	 * "Denial of service"-attacks using packet flooding.
-         */
-	for (i = 0; i < ISAKMP_HDR_COOKIES_LEN; i += 2) {
-		cp = msg + ISAKMP_HDR_COOKIES_OFF + i;
-		/* Doing it this way avoids alignment problems.  */
-		bucket ^= cp[0] | cp[1] << 8;
-	}
-	if (phase2)
-		for (i = 0; i < ISAKMP_HDR_MESSAGE_ID_LEN; i += 2) {
-			cp = msg + ISAKMP_HDR_MESSAGE_ID_OFF + i;
-			/* Doing it this way avoids alignment problems.  */
-			bucket ^= cp[0] | cp[1] << 8;
-		}
-	bucket &= bucket_mask;
-	for (exchange = LIST_FIRST(&exchange_tab[bucket]);
-	    exchange && (memcmp(msg + ISAKMP_HDR_COOKIES_OFF,
-		exchange->cookies, ISAKMP_HDR_COOKIES_LEN) != 0 ||
-		(phase2 && memcmp(msg + ISAKMP_HDR_MESSAGE_ID_OFF,
-		    exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN) != 0) ||
-		(!phase2 && !zero_test(msg + ISAKMP_HDR_MESSAGE_ID_OFF,
-		    ISAKMP_HDR_MESSAGE_ID_LEN)));
-	     exchange = LIST_NEXT(exchange, link))
-		;
-
-	return exchange;
-}
-
-/*
- * Create a phase PHASE exchange where INITIATOR denotes our role.  DOI
- * is the domain of interpretation identifier and TYPE tells what exchange
- * type to use per either the DOI document or the ISAKMP spec proper.
- * NSA tells how many SAs we should pre-allocate, and should be zero
- * when we have the responder role.
- */
-static struct exchange *
-exchange_create(int phase, int initiator, int doi, int type)
-{
-	struct exchange *exchange;
-	struct timeval	 expiration;
-	int	delta;
-
-	/*
-         * We want the exchange zeroed for exchange_free to be able to find
-         * out what fields have been filled-in.
-         */
-	exchange = calloc(1, sizeof *exchange);
-	if (!exchange) {
-		log_error("exchange_create: calloc (1, %lu) failed",
-		    (unsigned long)sizeof *exchange);
-		return 0;
-	}
-	exchange->phase = phase;
-	exchange->step = 0;
-	exchange->initiator = initiator;
-	memset(exchange->cookies, 0, ISAKMP_HDR_COOKIES_LEN);
-	memset(exchange->message_id, 0, ISAKMP_HDR_MESSAGE_ID_LEN);
-	exchange->doi = doi_lookup(doi);
-	exchange->type = type;
-	exchange->policy_id = -1;
-	exchange->exch_pc = exchange_script(exchange);
-	exchange->last_sent = exchange->last_received = 0;
-	TAILQ_INIT(&exchange->sa_list);
-	TAILQ_INIT(&exchange->aca_list);
-
-	/* Allocate the DOI-specific structure and initialize it to zeroes.  */
-	if (exchange->doi->exchange_size) {
-		exchange->data = calloc(1, exchange->doi->exchange_size);
-		if (!exchange->data) {
-			log_error("exchange_create: calloc (1, %lu) failed",
-			    (unsigned long)exchange->doi->exchange_size);
-			exchange_free(exchange);
-			return 0;
-		}
-	}
-	gettimeofday(&expiration, 0);
-	delta = conf_get_num("General", "Exchange-max-time",
-	    EXCHANGE_MAX_TIME);
-	expiration.tv_sec += delta;
-	exchange->death = timer_add_event("exchange_free_aux",
-	    exchange_free_aux, exchange, &expiration);
-	if (!exchange->death) {
-		/* If we don't give up we might start leaking...  */
-		exchange_free_aux(exchange);
-		return 0;
-	}
-	return exchange;
-}
-
-struct exchange_finalization_node {
-	void	(*first)(struct exchange *, void *, int);
-	void	*first_arg;
-	void	(*second)(struct exchange *, void *, int);
-	void	*second_arg;
-};
-
-/* Run the finalization functions of ARG.  */
-static void
-exchange_run_finalizations(struct exchange *exchange, void *arg, int fail)
-{
-	struct exchange_finalization_node *node = arg;
-
-	node->first(exchange, node->first_arg, fail);
-	node->second(exchange, node->second_arg, fail);
-	free(node);
-}
-
-/*
- * Add a finalization function FINALIZE with argument ARG to the tail
- * of the finalization function list of EXCHANGE.
- */
-static void
-exchange_add_finalization(struct exchange *exchange,
-    void (*finalize)(struct exchange *, void *, int), void *arg)
-{
-	struct exchange_finalization_node *node;
-
-	if (!finalize)
-		return;
-
-	if (!exchange->finalize) {
-		exchange->finalize = finalize;
-		exchange->finalize_arg = arg;
-		return;
-	}
-	node = malloc(sizeof *node);
-	if (!node) {
-		log_error("exchange_add_finalization: malloc (%lu) failed",
-		    (unsigned long)sizeof *node);
-		free(arg);
-		return;
-	}
-	node->first = exchange->finalize;
-	node->first_arg = exchange->finalize_arg;
-	node->second = finalize;
-	node->second_arg = arg;
-	exchange->finalize = exchange_run_finalizations;
-	exchange->finalize_arg = node;
-}
-
-#ifdef USE_ISAKMP_CFG
-static void
-exchange_establish_transaction(struct exchange *exchange, void *arg, int fail)
-{
-	/* Establish a TRANSACTION exchange.  */
-	struct exchange_finalization_node *node =
-	    (struct exchange_finalization_node *)arg;
-	struct sa *isakmp_sa = sa_lookup_by_name((char *) node->second_arg, 1);
-
-	if (isakmp_sa && !fail)
-		exchange_establish_p2(isakmp_sa, ISAKMP_EXCH_TRANSACTION, 0, 0,
-		    node->first, node->first_arg);
-
-	free(node);
-}
-#endif				/* USE_ISAKMP_CFG */
-
-/* Establish a phase 1 exchange.  */
-void
-exchange_establish_p1(struct transport *t, u_int8_t type, u_int32_t doi,
-    char *name, void *args, void (*finalize)(struct exchange *, void *, int),
-    void *arg)
-{
-	struct exchange		*exchange;
-	struct message		*msg;
-#ifdef USE_ISAKMP_CFG
-	struct conf_list	*flags;
-	struct conf_list_node	*flag;
-#endif
-	char	*tag = 0;
-	char	*str;
-
-	if (name) {
-		/* If no exchange type given, fetch from the configuration.  */
-		if (type == 0) {
-			/*
-			 * XXX Similar code can be found in
-			 * exchange_setup_p1.  Share?
-			 */
-
-			/* Find out our phase 1 mode.  */
-			tag = conf_get_str(name, "Configuration");
-			if (!tag) {
-				/* Use default setting.  */
-				tag = CONF_DFLT_TAG_PHASE1_CONFIG;
-			}
-			/* Figure out the DOI.  XXX Factor out?  */
-			str = conf_get_str(tag, "DOI");
-			if (!str || strcasecmp(str, "IPSEC") == 0)
-				doi = IPSEC_DOI_IPSEC;
-			else if (strcasecmp(str, "ISAKMP") == 0)
-				doi = ISAKMP_DOI_ISAKMP;
-			else {
-				log_print("exchange_establish_p1: "
-				    "DOI \"%s\" unsupported", str);
-				return;
-			}
-
-			/* What exchange type do we want?  */
-			str = conf_get_str(tag, "EXCHANGE_TYPE");
-			if (!str) {
-				log_print("exchange_establish_p1: "
-				    "no \"EXCHANGE_TYPE\" tag in [%s] section",
-				    tag);
-				return;
-			}
-			type = constant_value(isakmp_exch_cst, str);
-			if (!type) {
-				log_print("exchange_setup_p1: "
-				    "unknown exchange type %s", str);
-				return;
-			}
-		}
-	}
-	exchange = exchange_create(1, 1, doi, type);
-	if (!exchange) {
-		/* XXX Do something here?  */
-		return;
-	}
-	if (name) {
-		exchange->name = strdup(name);
-		if (!exchange->name) {
-			log_error("exchange_establish_p1: "
-			    "strdup (\"%s\") failed", name);
-			exchange_free(exchange);
-			return;
-		}
-	}
-	exchange->policy = name ? conf_get_str(name, "Configuration") : 0;
-	if (!exchange->policy && name)
-		exchange->policy = CONF_DFLT_TAG_PHASE1_CONFIG;
-
-#ifdef USE_ISAKMP_CFG
-	if (name && (flags = conf_get_list(name, "Flags")) != NULL) {
-		for (flag = TAILQ_FIRST(&flags->fields); flag;
-		    flag = TAILQ_NEXT(flag, link))
-			if (strcasecmp(flag->field, "ikecfg") == 0) {
-				struct exchange_finalization_node *node;
-
-				node = calloc(1, (unsigned long)sizeof *node);
-				if (!node) {
-					log_print("exchange_establish_p1: "
-					    "calloc (1, %lu) failed",
-					    (unsigned long)sizeof(*node));
-					exchange_free(exchange);
-					return;
-				}
-				/*
-				 * Insert this finalization inbetween
-				 * the original.
-				 */
-				node->first = finalize;
-				node->first_arg = arg;
-				node->second_arg = name;
-				exchange_add_finalization(exchange,
-				    exchange_establish_transaction,
-				    node);
-				finalize = 0;
-			}
-		conf_free_list(flags);
-	}
-#endif				/* USE_ISAKMP_CFG */
-
-	exchange_add_finalization(exchange, finalize, arg);
-	cookie_gen(t, exchange, exchange->cookies, ISAKMP_HDR_ICOOKIE_LEN);
-	exchange_enter(exchange);
-#ifdef USE_DEBUG
-	exchange_dump("exchange_establish_p1", exchange);
-#endif
-
-	msg = message_alloc(t, 0, ISAKMP_HDR_SZ);
-	if (!msg) {
-		log_print("exchange_establish_p1: message_alloc () failed");
-		exchange_free(exchange);
-		return;
-	}
-	msg->exchange = exchange;
-
-	/* Do not create SA for an information or transaction exchange. */
-	if (exchange->type != ISAKMP_EXCH_INFO
-	    && exchange->type != ISAKMP_EXCH_TRANSACTION) {
-		/*
-		 * Don't install a transport into this SA as it will be an
-		 * INADDR_ANY address in the local end, which is not good at
-		 * all.  Let the reply packet install the transport instead.
-	         */
-		sa_create(exchange, 0);
-		msg->isakmp_sa = TAILQ_FIRST(&exchange->sa_list);
-		if (!msg->isakmp_sa) {
-			/* XXX Do something more here?  */
-			message_free(msg);
-			exchange_free(exchange);
-			return;
-		}
-		sa_reference(msg->isakmp_sa);
-	}
-	msg->extra = args;
-
-	exchange_run(msg);
-}
-
-/* Establish a phase 2 exchange.  XXX With just one SA for now.  */
-void
-exchange_establish_p2(struct sa *isakmp_sa, u_int8_t type, char *name,
-    void *args, void (*finalize)(struct exchange *, void *, int), void *arg)
-{
-	struct exchange *exchange;
-	struct message	*msg;
-	u_int32_t        doi = ISAKMP_DOI_ISAKMP;
-	u_int32_t        seq = 0;
-	int              i;
-	char		*tag, *str;
-
-	if (isakmp_sa)
-		doi = isakmp_sa->doi->id;
-
-	if (name) {
-		/* Find out our phase 2 modes.  */
-		tag = conf_get_str(name, "Configuration");
-		if (!tag) {
-			log_print("exchange_establish_p2: "
-			    "no configuration for peer \"%s\"", name);
-			return;
-		}
-		seq = (u_int32_t)conf_get_num(name, "Acquire-ID", 0);
-
-		/* Figure out the DOI.  */
-		str = conf_get_str(tag, "DOI");
-		if (!str || strcasecmp(str, "IPSEC") == 0)
-			doi = IPSEC_DOI_IPSEC;
-		else if (strcasecmp(str, "ISAKMP") == 0)
-			doi = ISAKMP_DOI_ISAKMP;
-		else {
-			log_print("exchange_establish_p2: "
-			    "DOI \"%s\" unsupported", str);
-			return;
-		}
-
-		/* What exchange type do we want?  */
-		if (!type) {
-			str = conf_get_str(tag, "EXCHANGE_TYPE");
-			if (!str) {
-				log_print("exchange_establish_p2: "
-				    "no \"EXCHANGE_TYPE\" tag in [%s] section",
-				    tag);
-				return;
-			}
-			/* XXX IKE dependent.  */
-			type = constant_value(ike_exch_cst, str);
-			if (!type) {
-				log_print("exchange_establish_p2: unknown "
-				    "exchange type %s", str);
-				return;
-			}
-		}
-	}
-	exchange = exchange_create(2, 1, doi, type);
-	if (!exchange) {
-		/* XXX Do something here?  */
-		return;
-	}
-	if (name) {
-		exchange->name = strdup(name);
-		if (!exchange->name) {
-			log_error("exchange_establish_p2: "
-			    "strdup (\"%s\") failed", name);
-			exchange_free(exchange);
-			return;
-		}
-	}
-	exchange->policy = name ? conf_get_str(name, "Configuration") : 0;
-	exchange->finalize = finalize;
-	exchange->finalize_arg = arg;
-	exchange->seq = seq;
-	memcpy(exchange->cookies, isakmp_sa->cookies, ISAKMP_HDR_COOKIES_LEN);
-	getrandom(exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN);
-	exchange->flags |= EXCHANGE_FLAG_ENCRYPT;
-#if defined (USE_NAT_TRAVERSAL)
-	if (isakmp_sa->flags & SA_FLAG_NAT_T_ENABLE)
-		exchange->flags |= EXCHANGE_FLAG_NAT_T_ENABLE;
-	if (isakmp_sa->flags & SA_FLAG_NAT_T_KEEPALIVE)
-		exchange->flags |= EXCHANGE_FLAG_NAT_T_KEEPALIVE;
-#endif
-	exchange_enter(exchange);
-#ifdef USE_DEBUG
-	exchange_dump("exchange_establish_p2", exchange);
-#endif
-
-	/*
-         * Do not create SA's for informational exchanges.
-         * XXX How to handle new group mode?
-         */
-	if (exchange->type != ISAKMP_EXCH_INFO &&
-	    exchange->type != ISAKMP_EXCH_TRANSACTION) {
-		/* XXX Number of SAs should come from the args structure.  */
-		for (i = 0; i < 1; i++)
-			if (sa_create(exchange, isakmp_sa->transport)) {
-				exchange_free(exchange);
-				return;
-			}
-	}
-	msg = message_alloc(isakmp_sa->transport, 0, ISAKMP_HDR_SZ);
-	msg->isakmp_sa = isakmp_sa;
-	sa_reference(isakmp_sa);
-
-	msg->extra = args;
-
-	/* This needs to be done late or else get_keystate won't work right. */
-	msg->exchange = exchange;
-
-	exchange_run(msg);
-}
-
-/* Out of an incoming phase 1 message, setup an exchange.  */
-struct exchange *
-exchange_setup_p1(struct message *msg, u_int32_t doi)
-{
-	struct transport	*t = msg->transport;
-	struct exchange		*exchange;
-	struct sockaddr		*dst;
-#ifdef USE_ISAKMP_CFG
-	struct conf_list	*flags;
-	struct conf_list_node	*flag;
-#endif
-	char		*name = 0, *policy = 0, *str;
-	u_int32_t        want_doi;
-	u_int8_t         type;
-
-	/* XXX Similar code can be found in exchange_establish_p1.  Share?  */
-
-	/*
-	 * Unless this is an informational exchange, look up our policy for
-	 * this peer.
-         */
-	type = GET_ISAKMP_HDR_EXCH_TYPE(msg->iov[0].iov_base);
-	if (type != ISAKMP_EXCH_INFO) {
-		/*
-	         * Find out our inbound phase 1 mode.
-	         */
-		t->vtbl->get_dst(t, &dst);
-		if (sockaddr2text(dst, &str, 0) == -1)
-			return 0;
-		name = conf_get_str("Phase 1", str);
-		free(str);
-		if (name) {
-			/*
-			 * If another phase 1 exchange is ongoing don't bother
-			 * returning the call. However, we will need to
-			 * continue responding if our phase 1 exchange is
-			 * still waiting for step 1 (i.e still half-open).
-		         */
-			if (exchange_lookup_active(name, 1))
-				return 0;
-		} else {
-			name = conf_get_str("Phase 1", "Default");
-			if (!name) {
-				log_print("exchange_setup_p1: no \"Default\" "
-				    "tag in [Phase 1] section");
-				return 0;
-			}
-		}
-
-		policy = conf_get_str(name, "Configuration");
-		if (!policy)
-			policy = CONF_DFLT_TAG_PHASE1_CONFIG;
-
-		/* Figure out the DOI.  */
-		str = conf_get_str(policy, "DOI");
-		if (!str || strcasecmp(str, "IPSEC") == 0)
-			want_doi = IPSEC_DOI_IPSEC;
-		else if (strcasecmp(str, "ISAKMP") == 0)
-			want_doi = ISAKMP_DOI_ISAKMP;
-		else {
-			log_print("exchange_setup_p1: "
-			    "DOI \"%s\" unsupported", str);
-			return 0;
-		}
-		if (want_doi != doi) {
-			/* XXX Should I tell what DOI I got?  */
-			log_print("exchange_setup_p1: expected %s DOI", str);
-			return 0;
-		}
-		/* What exchange type do we want?  */
-		str = conf_get_str(policy, "EXCHANGE_TYPE");
-		if (!str) {
-			log_print("exchange_setup_p1: no \"EXCHANGE_TYPE\" "
-			    "tag in [%s] section", policy);
-			return 0;
-		}
-		type = constant_value(isakmp_exch_cst, str);
-		if (!type) {
-			log_print("exchange_setup_p1: "
-			    "unknown exchange type %s", str);
-			return 0;
-		}
-		if (type != GET_ISAKMP_HDR_EXCH_TYPE(msg->iov[0].iov_base)) {
-			log_print("exchange_setup_p1: "
-			    "expected exchange type %s got %s", str,
-			    constant_name(isakmp_exch_cst,
-				GET_ISAKMP_HDR_EXCH_TYPE(msg->iov[0].iov_base)));
-			return 0;
-		}
-	}
-	exchange = exchange_create(1, 0, doi, type);
-	if (!exchange)
-		return 0;
-
-	exchange->name = name ? strdup(name) : 0;
-	if (name && !exchange->name) {
-		log_error("exchange_setup_p1: strdup (\"%s\") failed", name);
-		exchange_free(exchange);
-		return 0;
-	}
-	exchange->policy = policy;
-
-#ifdef USE_ISAKMP_CFG
-	if (name && (flags = conf_get_list(name, "Flags")) != NULL) {
-		for (flag = TAILQ_FIRST(&flags->fields); flag;
-		     flag = TAILQ_NEXT(flag, link))
-			if (strcasecmp(flag->field, "ikecfg") == 0) {
-				struct exchange_finalization_node *node;
-
-				node = calloc(1, (unsigned long)sizeof *node);
-				if (!node) {
-					log_print("exchange_establish_p1: "
-					    "calloc (1, %lu) failed",
-					    (unsigned long)sizeof(*node));
-					exchange_free(exchange);
-					return 0;
-				}
-				/*
-				 * Insert this finalization inbetween
-				 * the original.
-				 */
-				node->first = 0;
-				node->first_arg = 0;
-				node->second_arg = name;
-				exchange_add_finalization(exchange,
-				    exchange_establish_transaction,
-				    node);
-			}
-		conf_free_list(flags);
-	}
-#endif
-
-	cookie_gen(msg->transport, exchange, exchange->cookies +
-	    ISAKMP_HDR_ICOOKIE_LEN, ISAKMP_HDR_RCOOKIE_LEN);
-	GET_ISAKMP_HDR_ICOOKIE(msg->iov[0].iov_base, exchange->cookies);
-	exchange_enter(exchange);
-#ifdef USE_DEBUG
-	exchange_dump("exchange_setup_p1", exchange);
-#endif
-	return exchange;
-}
-
-/* Out of an incoming phase 2 message, setup an exchange.  */
-struct exchange *
-exchange_setup_p2(struct message *msg, u_int8_t doi)
-{
-	struct exchange *exchange;
-	u_int8_t	*buf = msg->iov[0].iov_base;
-
-	exchange = exchange_create(2, 0, doi, GET_ISAKMP_HDR_EXCH_TYPE(buf));
-	if (!exchange)
-		return 0;
-	GET_ISAKMP_HDR_ICOOKIE(buf, exchange->cookies);
-	GET_ISAKMP_HDR_RCOOKIE(buf,
-	    exchange->cookies + ISAKMP_HDR_ICOOKIE_LEN);
-	GET_ISAKMP_HDR_MESSAGE_ID(buf, exchange->message_id);
-#if defined (USE_NAT_TRAVERSAL)
-	if (msg->isakmp_sa->flags & SA_FLAG_NAT_T_ENABLE)
-		exchange->flags |= EXCHANGE_FLAG_NAT_T_ENABLE;
-	if (msg->isakmp_sa->flags & SA_FLAG_NAT_T_KEEPALIVE)
-		exchange->flags |= EXCHANGE_FLAG_NAT_T_KEEPALIVE;
-#endif
-	exchange_enter(exchange);
-#ifdef USE_DEBUG
-	exchange_dump("exchange_setup_p2", exchange);
-#endif
-	return exchange;
-}
-
-/* Dump interesting data about an exchange.  */
-static void
-exchange_dump_real(char *header, struct exchange *exchange, int class,
-    int level)
-{
-	struct sa	*sa;
-	char             buf[LOG_SIZE];
-	/* Don't risk overflowing the final log buffer.  */
-	size_t           bufsize_max = LOG_SIZE - strlen(header) - 32;
-
-	LOG_DBG((class, level,
-	    "%s: %p %s %s policy %s phase %d doi %d exchange %d step %d",
-	    header, exchange, exchange->name ? exchange->name : "<unnamed>",
-	    exchange->policy ? exchange->policy : "<no policy>",
-	    exchange->initiator ? "initiator" : "responder", exchange->phase,
-	    exchange->doi->id, exchange->type, exchange->step));
-	LOG_DBG((class, level, "%s: icookie %08x%08x rcookie %08x%08x", header,
-	    decode_32(exchange->cookies), decode_32(exchange->cookies + 4),
-	    decode_32(exchange->cookies + 8),
-	    decode_32(exchange->cookies + 12)));
-
-	/* Include phase 2 SA list for this exchange */
-	if (exchange->phase == 2) {
-		snprintf(buf, bufsize_max, "sa_list ");
-		for (sa = TAILQ_FIRST(&exchange->sa_list);
-		    sa && strlen(buf) < bufsize_max; sa = TAILQ_NEXT(sa, next))
-			snprintf(buf + strlen(buf), bufsize_max - strlen(buf),
-			    "%p ", sa);
-		if (sa)
-			strlcat(buf, "...", bufsize_max);
-	} else
-		buf[0] = '\0';
-
-	LOG_DBG((class, level, "%s: msgid %08x %s", header,
-	    decode_32(exchange->message_id), buf));
-}
-
-#ifdef USE_DEBUG
-static void
-exchange_dump(char *header, struct exchange *exchange)
-{
-	exchange_dump_real(header, exchange, LOG_EXCHANGE, 10);
-}
-#endif
-
-void
-exchange_report(void)
-{
-	struct exchange	*exchange;
-	int	i;
-
-	for (i = 0; i <= bucket_mask; i++)
-		for (exchange = LIST_FIRST(&exchange_tab[i]); exchange;
-		    exchange = LIST_NEXT(exchange, link))
-			exchange_dump_real("exchange_report", exchange,
-			    LOG_REPORT, 0);
-}
-
-/*
- * Release all resources this exchange is using *except* for the "death"
- * event.  When removing an exchange from the expiration handler that event
- * will be dealt with therein instead.
- */
-static void
-exchange_free_aux(void *v_exch)
-{
-	struct exchange		*exchange = v_exch;
-	struct sa		*sa, *next_sa;
-	struct cert_handler	*handler;
-
-	LOG_DBG((LOG_EXCHANGE, 80, "exchange_free_aux: freeing exchange %p",
-	    exchange));
-
-	if (exchange->last_received)
-		message_free(exchange->last_received);
-	if (exchange->last_sent)
-		message_free(exchange->last_sent);
-	if (exchange->in_transit &&
-	    exchange->in_transit != exchange->last_sent)
-		message_free(exchange->in_transit);
-	if (exchange->nonce_i)
-		free(exchange->nonce_i);
-	if (exchange->nonce_r)
-		free(exchange->nonce_r);
-	if (exchange->id_i)
-		free(exchange->id_i);
-	if (exchange->id_r)
-		free(exchange->id_r);
-	if (exchange->keystate)
-		free(exchange->keystate);
-	if (exchange->doi && exchange->doi->free_exchange_data)
-		exchange->doi->free_exchange_data(exchange->data);
-	if (exchange->data)
-		free(exchange->data);
-	if (exchange->name)
-		free(exchange->name);
-	if (exchange->recv_cert) {
-		handler = cert_get(exchange->recv_certtype);
-		if (handler)
-			handler->cert_free(exchange->recv_cert);
-	}
-	if (exchange->sent_cert) {
-		handler = cert_get(exchange->sent_certtype);
-		if (handler)
-			handler->cert_free(exchange->sent_cert);
-	}
-	if (exchange->recv_key)
-		key_free(exchange->recv_keytype, ISAKMP_KEYTYPE_PUBLIC,
-		    exchange->recv_key);
-	if (exchange->keynote_key)
-		free(exchange->keynote_key);	/* This is just a string */
-
-#if defined (POLICY) || defined (KEYNOTE)
-	if (exchange->policy_id != -1)
-		kn_close(exchange->policy_id);
-#endif
-
-	exchange_free_aca_list(exchange);
-	LIST_REMOVE(exchange, link);
-
-	/* Tell potential finalize routine we never got there.  */
-	if (exchange->finalize)
-		exchange->finalize(exchange, exchange->finalize_arg, 1);
-
-	/* Remove any SAs that have not been disassociated from us.  */
-	for (sa = TAILQ_FIRST(&exchange->sa_list); sa; sa = next_sa) {
-		next_sa = TAILQ_NEXT(sa, next);
-		/* One for the reference in exchange->sa_list.  */
-		sa_release(sa);
-		/* And two more for the expiration and SA linked list.  */
-		sa_free(sa);
-	}
-
-	free(exchange);
-}
-
-/* Release all resources this exchange is using.  */
-void
-exchange_free(struct exchange *exchange)
-{
-	if (exchange->death)
-		timer_remove_event(exchange->death);
-	exchange_free_aux(exchange);
-}
-
-/*
- * Upgrade the phase 1 exchange and its ISAKMP SA with the rcookie of our
- * peer (found in his recently sent message MSG).
- */
-void
-exchange_upgrade_p1(struct message *msg)
-{
-	struct exchange *exchange = msg->exchange;
-
-	LIST_REMOVE(exchange, link);
-	GET_ISAKMP_HDR_RCOOKIE(msg->iov[0].iov_base, exchange->cookies +
-	    ISAKMP_HDR_ICOOKIE_LEN);
-	exchange_enter(exchange);
-	sa_isakmp_upgrade(msg);
-}
-
-static int
-exchange_check_old_sa(struct sa *sa, void *v_arg)
-{
-	struct sa	*new_sa = v_arg;
-	char		 res1[1024];
-
-	if (sa == new_sa || !sa->name || !(sa->flags & SA_FLAG_READY) ||
-	    (sa->flags & SA_FLAG_REPLACED))
-		return 0;
-
-	if (sa->phase != new_sa->phase || new_sa->name == 0 ||
-	    strcasecmp(sa->name, new_sa->name))
-		return 0;
-
-	if (sa->initiator)
-		strlcpy(res1, ipsec_decode_ids("%s %s", sa->id_i, sa->id_i_len,
-		    sa->id_r, sa->id_r_len, 0), sizeof res1);
-	else
-		strlcpy(res1, ipsec_decode_ids("%s %s", sa->id_r, sa->id_r_len,
-		    sa->id_i, sa->id_i_len, 0), sizeof res1);
-
-	LOG_DBG((LOG_EXCHANGE, 30,
-	    "checking whether new SA replaces existing SA with IDs %s", res1));
-
-	if (new_sa->initiator)
-		return strcasecmp(res1, ipsec_decode_ids("%s %s", new_sa->id_i,
-		    new_sa->id_i_len, new_sa->id_r, new_sa->id_r_len, 0)) == 0;
-	else
-		return strcasecmp(res1, ipsec_decode_ids("%s %s", new_sa->id_r,
-		    new_sa->id_r_len, new_sa->id_i, new_sa->id_i_len, 0)) == 0;
-}
-
-void
-exchange_finalize(struct message *msg)
-{
-	struct exchange		*exchange = msg->exchange;
-	struct sa		*sa, *old_sa;
-	struct proto		*proto;
-	struct conf_list	*attrs;
-	struct conf_list_node	*attr;
-	struct cert_handler	*handler;
-	int	 i;
-	char	*id_doi, *id_trp;
-
-#ifdef USE_DEBUG
-	exchange_dump("exchange_finalize", exchange);
-#endif
-
-	/* Copy the ID from phase 1 to exchange or phase 2 SA.  */
-	if (msg->isakmp_sa) {
-		if (exchange->id_i && exchange->id_r) {
-			ipsec_clone_id(&msg->isakmp_sa->id_i,
-			    &msg->isakmp_sa->id_i_len, exchange->id_i,
-			    exchange->id_i_len);
-			ipsec_clone_id(&msg->isakmp_sa->id_r,
-			    &msg->isakmp_sa->id_r_len, exchange->id_r,
-			    exchange->id_r_len);
-		} else if (msg->isakmp_sa->id_i && msg->isakmp_sa->id_r) {
-			ipsec_clone_id(&exchange->id_i, &exchange->id_i_len,
-			    msg->isakmp_sa->id_i, msg->isakmp_sa->id_i_len);
-			ipsec_clone_id(&exchange->id_r, &exchange->id_r_len,
-			    msg->isakmp_sa->id_r, msg->isakmp_sa->id_r_len);
-		}
-	}
-	/*
-         * Walk over all the SAs and noting them as ready.  If we set the
-         * COMMIT bit, tell the peer each SA is connected.
-         *
-         * XXX The decision should really be based on if a SA was installed
-         * successfully.
-         */
-	for (sa = TAILQ_FIRST(&exchange->sa_list); sa;
-	    sa = TAILQ_NEXT(sa, next)) {
-		/* Move over the name to the SA.  */
-		sa->name = exchange->name ? strdup(exchange->name) : 0;
-
-		if (exchange->flags & EXCHANGE_FLAG_I_COMMITTED) {
-			for (proto = TAILQ_FIRST(&sa->protos); proto;
-			    proto = TAILQ_NEXT(proto, link))
-				for (i = 0; i < 2; i++)
-					message_send_notification(exchange->last_received,
-					    msg->isakmp_sa,
-					    ISAKMP_NOTIFY_STATUS_CONNECTED,
-					    proto, i);
-		}
-		/*
-		 * Locate any old SAs and mark them replaced
-		 * (SA_FLAG_REPLACED).
-		 */
-		sa->initiator = exchange->initiator;
-		while ((old_sa = sa_find(exchange_check_old_sa, sa)) != 0)
-			sa_mark_replaced(old_sa);
-
-		/* Setup the SA flags.  */
-		sa->flags |= SA_FLAG_READY;
-		if (exchange->name) {
-			attrs = conf_get_list(exchange->name, "Flags");
-			if (attrs) {
-				for (attr = TAILQ_FIRST(&attrs->fields); attr;
-				    attr = TAILQ_NEXT(attr, link))
-					sa->flags |= sa_flag(attr->field);
-				conf_free_list(attrs);
-			}
-			/* 'Connections' should stay alive.  */
-			if (connection_exist(exchange->name)) {
-				sa->flags |= SA_FLAG_STAYALIVE;
-
-				/*
-				 * ISAKMP SA of this connection should also
-				 * stay alive.
-				 */
-				if (exchange->phase == 2 && msg->isakmp_sa)
-					msg->isakmp_sa->flags |=
-					    SA_FLAG_STAYALIVE;
-			}
-		}
-		sa->seq = exchange->seq;
-		sa->exch_type = exchange->type;
-	}
-
-	/*
-	 * If this was an phase 1 SA negotiation, save the keystate in the
-	 * ISAKMP SA structure for future initialization of phase 2 exchanges'
-	 * keystates.  Also save the Phase 1 ID and authentication
-	 * information.
-         */
-	if (exchange->phase == 1 && msg->isakmp_sa) {
-		msg->isakmp_sa->keystate = exchange->keystate;
-		exchange->keystate = 0;
-
-		msg->isakmp_sa->recv_certtype = exchange->recv_certtype;
-		msg->isakmp_sa->sent_certtype = exchange->sent_certtype;
-		msg->isakmp_sa->recv_keytype = exchange->recv_keytype;
-		msg->isakmp_sa->recv_key = exchange->recv_key;
-		msg->isakmp_sa->keynote_key = exchange->keynote_key;
-		/* Reset.  */
-		exchange->recv_key = 0;
-		exchange->keynote_key = 0;
-		msg->isakmp_sa->policy_id = exchange->policy_id;
-		exchange->policy_id = -1;
-		msg->isakmp_sa->initiator = exchange->initiator;
-
-		if (exchange->recv_certtype && exchange->recv_cert) {
-			handler = cert_get(exchange->recv_certtype);
-			if (handler)
-				msg->isakmp_sa->recv_cert =
-				    handler->cert_dup(exchange->recv_cert);
-		}
-		if (exchange->sent_certtype) {
-			handler = cert_get(exchange->sent_certtype);
-			if (handler)
-				msg->isakmp_sa->sent_cert =
-				    handler->cert_dup(exchange->sent_cert);
-		}
-		if (exchange->doi)
-			id_doi = exchange->doi->decode_ids(
-			    "initiator id %s, responder id %s",
-			    exchange->id_i, exchange->id_i_len,
-			    exchange->id_r, exchange->id_r_len, 0);
-		else
-			id_doi = "<no doi>";
-
-		if (msg->isakmp_sa->transport)
-			id_trp =
-			    msg->isakmp_sa->transport->vtbl->decode_ids(msg->isakmp_sa->transport);
-		else
-			id_trp = "<no transport>";
-
-#if defined (USE_NAT_TRAVERSAL)
-		if (exchange->flags & EXCHANGE_FLAG_NAT_T_ENABLE)
-			msg->isakmp_sa->flags |= SA_FLAG_NAT_T_ENABLE;
-		if (exchange->flags & EXCHANGE_FLAG_NAT_T_KEEPALIVE)
-			msg->isakmp_sa->flags |= SA_FLAG_NAT_T_KEEPALIVE;
-#endif
-
-		LOG_DBG((LOG_EXCHANGE, 10,
-		    "exchange_finalize: phase 1 done: %s, %s", id_doi,
-		    id_trp));
-
-		log_verbose("isakmpd: phase 1 done: %s, %s", id_doi, id_trp);
-	}
-	exchange->doi->finalize_exchange(msg);
-	if (exchange->finalize)
-		exchange->finalize(exchange, exchange->finalize_arg, 0);
-	exchange->finalize = 0;
-
-	/*
-         * There is no reason to keep the SAs connected to us anymore, in fact
-         * it can hurt us if we have short lifetimes on the SAs and we try
-         * to call exchange_report, where the SA list will be walked and
-         * references to freed SAs can occur.
-         */
-	while (TAILQ_FIRST(&exchange->sa_list)) {
-		sa = TAILQ_FIRST(&exchange->sa_list);
-
-		if (exchange->id_i && exchange->id_r) {
-			ipsec_clone_id(&sa->id_i, &sa->id_i_len,
-			    exchange->id_i, exchange->id_i_len);
-			ipsec_clone_id(&sa->id_r, &sa->id_r_len,
-			    exchange->id_r, exchange->id_r_len);
-		}
-		TAILQ_REMOVE(&exchange->sa_list, sa, next);
-		sa_release(sa);
-	}
-
-	/* If we have nothing to retransmit we can safely remove ourselves.  */
-	if (!exchange->last_sent)
-		exchange_free(exchange);
-}
-
-/* Stash a nonce into the exchange data.  */
-static int
-exchange_nonce(struct exchange *exchange, int peer, size_t nonce_sz,
-    u_int8_t *buf)
-{
-	u_int8_t      **nonce;
-	size_t         *nonce_len;
-	int		initiator = exchange->initiator ^ peer;
-	char            header[32];
-
-	nonce = initiator ? &exchange->nonce_i : &exchange->nonce_r;
-	nonce_len =
-	    initiator ? &exchange->nonce_i_len : &exchange->nonce_r_len;
-	*nonce_len = nonce_sz;
-	*nonce = malloc(nonce_sz);
-	if (!*nonce) {
-		log_error("exchange_nonce: malloc (%lu) failed",
-		    (unsigned long)nonce_sz);
-		return -1;
-	}
-	memcpy(*nonce, buf, nonce_sz);
-	snprintf(header, sizeof header, "exchange_nonce: NONCE_%c",
-	    initiator ? 'i' : 'r');
-	LOG_DBG_BUF((LOG_EXCHANGE, 80, header, *nonce, nonce_sz));
-	return 0;
-}
-
-/* Generate our NONCE.  */
-int
-exchange_gen_nonce(struct message *msg, size_t nonce_sz)
-{
-	struct exchange *exchange = msg->exchange;
-	u_int8_t	*buf;
-
-	buf = malloc(ISAKMP_NONCE_SZ + nonce_sz);
-	if (!buf) {
-		log_error("exchange_gen_nonce: malloc (%lu) failed",
-		    ISAKMP_NONCE_SZ + (unsigned long)nonce_sz);
-		return -1;
-	}
-	getrandom(buf + ISAKMP_NONCE_DATA_OFF, nonce_sz);
-	if (message_add_payload(msg, ISAKMP_PAYLOAD_NONCE, buf,
-	    ISAKMP_NONCE_SZ + nonce_sz, 1)) {
-		free(buf);
-		return -1;
-	}
-	return exchange_nonce(exchange, 0, nonce_sz,
-	    buf + ISAKMP_NONCE_DATA_OFF);
-}
-
-/* Save the peer's NONCE.  */
-int
-exchange_save_nonce(struct message *msg)
-{
-	struct payload	*noncep;
-	struct exchange *exchange = msg->exchange;
-
-	noncep = payload_first(msg, ISAKMP_PAYLOAD_NONCE);
-	noncep->flags |= PL_MARK;
-	return exchange_nonce(exchange, 1, GET_ISAKMP_GEN_LENGTH(noncep->p) -
-	    ISAKMP_NONCE_DATA_OFF, noncep->p + ISAKMP_NONCE_DATA_OFF);
-}
-
-/* Save the peer's CERT REQuests.  */
-int
-exchange_save_certreq(struct message *msg)
-{
-	struct payload	*cp = payload_first(msg, ISAKMP_PAYLOAD_CERT_REQ);
-	struct exchange	*exchange = msg->exchange;
-	struct certreq_aca *aca;
-
-	for (; cp; cp = TAILQ_NEXT(cp, link)) {
-		cp->flags |= PL_MARK;
-		aca = certreq_decode(GET_ISAKMP_CERTREQ_TYPE(cp->p), cp->p +
-		    ISAKMP_CERTREQ_AUTHORITY_OFF, GET_ISAKMP_GEN_LENGTH(cp->p)
-		    - ISAKMP_CERTREQ_AUTHORITY_OFF);
-		if (aca)
-			TAILQ_INSERT_TAIL(&exchange->aca_list, aca, link);
-	}
-
-	return 0;
-}
-
-/* Free the list of pending CERTREQs.  */
-void
-exchange_free_aca_list(struct exchange *exchange)
-{
-	struct certreq_aca *aca;
-
-	for (aca = TAILQ_FIRST(&exchange->aca_list); aca;
-	    aca = TAILQ_FIRST(&exchange->aca_list)) {
-		if (aca->data) {
-			if (aca->handler)
-				aca->handler->free_aca(aca->data);
-			free(aca->data);
-		}
-		TAILQ_REMOVE(&exchange->aca_list, aca, link);
-		free(aca);
-	}
-}
-
-/* Obtain certificates from acceptable certification authority.  */
-int
-exchange_add_certs(struct message *msg)
-{
-	struct exchange *exchange = msg->exchange;
-	struct certreq_aca *aca;
-	u_int8_t       *cert = 0, *new_cert = 0;
-	u_int32_t       certlen;
-	u_int8_t       *id;
-	size_t          id_len;
-
-	id = exchange->initiator ? exchange->id_r : exchange->id_i;
-	id_len = exchange->initiator ? exchange->id_r_len : exchange->id_i_len;
-
-	/*
-         * Without IDs we cannot handle this yet. Keep the aca_list around for
-         * a later step/retry to see if we got the ID by then.
-         * Note: A 'return -1' breaks X509-auth interop in the responder case
-         *       with some IPsec clients that send CERTREQs early (such as
-	 *       the SSH Sentinel).
-         */
-	if (!id)
-		return 0;
-
-	for (aca = TAILQ_FIRST(&exchange->aca_list); aca;
-	    aca = TAILQ_NEXT(aca, link)) {
-		/* XXX? If we can not satisfy a CERTREQ we drop the message. */
-		if (!aca->handler->cert_obtain(id, id_len, aca->data, &cert,
-		    &certlen)) {
-			log_print("exchange_add_certs: could not obtain cert "
-			    "for a type %d cert request", aca->id);
-			if (cert)
-				free(cert);
-			return -1;
-		}
-		new_cert = realloc(cert, ISAKMP_CERT_SZ + certlen);
-		if (!new_cert) {
-			log_error("exchange_add_certs: realloc (%p, %d) "
-			    "failed", cert, ISAKMP_CERT_SZ + certlen);
-			if (cert)
-				free(cert);
-			return -1;
-		}
-		cert = new_cert;
-		memmove(cert + ISAKMP_CERT_DATA_OFF, cert, certlen);
-		SET_ISAKMP_CERT_ENCODING(cert, aca->id);
-		if (message_add_payload(msg, ISAKMP_PAYLOAD_CERT, cert,
-		    ISAKMP_CERT_SZ + certlen, 1)) {
-			free(cert);
-			return -1;
-		}
-	}
-
-	/* We dont need the CERT REQs any more, they are answered.  */
-	exchange_free_aca_list(exchange);
-
-	return 0;
-}
-
-static void
-exchange_establish_finalize(struct exchange *exchange, void *arg, int fail)
-{
-	char	*name = arg;
-
-	LOG_DBG((LOG_EXCHANGE, 20, "exchange_establish_finalize: "
-	    "finalizing exchange %p with arg %p (%s) & fail = %d",
-	    exchange, arg, name ? name : "<unnamed>", fail));
-
-	if (!fail)
-		exchange_establish(name, 0, 0);
-	free(name);
-}
-
-/*
- * Establish an exchange named NAME, and record the FINALIZE function
- * taking ARG as an argument to be run after the exchange is ready.
- */
-void
-exchange_establish(char *name, void (*finalize)(struct exchange *, void *,
-    int), void *arg)
-{
-	struct transport	*transport;
-	struct sa		*isakmp_sa;
-	struct exchange		*exchange;
-	int	 phase;
-	char	*trpt, *peer;
-
-	phase = conf_get_num(name, "Phase", 0);
-
-	/*
-	 * First of all, never try to establish anything if another exchange
-	 * of the same kind is running.
-         */
-	exchange = exchange_lookup_by_name(name, phase);
-	if (exchange) {
-		LOG_DBG((LOG_EXCHANGE, 40,
-		    "exchange_establish: %s exchange already exists as %p",
-		    name, exchange));
-		exchange_add_finalization(exchange, finalize, arg);
-		return;
-	}
-	switch (phase) {
-	case 1:
-		trpt = conf_get_str(name, "Transport");
-		if (!trpt) {
-			/* Phase 1 transport defaults to "udp".  */
-			trpt = ISAKMP_DEFAULT_TRANSPORT;
-		}
-		transport = transport_create(trpt, name);
-		if (!transport) {
-			log_print("exchange_establish: transport \"%s\" for "
-			    "peer \"%s\" could not be created", trpt, name);
-			return;
-		}
-		exchange_establish_p1(transport, 0, 0, name, 0, finalize, arg);
-		break;
-
-	case 2:
-		peer = conf_get_str(name, "ISAKMP-peer");
-		if (!peer) {
-			log_print("exchange_establish: No ISAKMP-peer given "
-			    "for \"%s\"", name);
-			return;
-		}
-		isakmp_sa = sa_lookup_by_name(peer, 1);
-		if (!isakmp_sa) {
-			name = strdup(name);
-			if (!name) {
-				log_error("exchange_establish: "
-				    "strdup (\"%s\") failed", name);
-				return;
-			}
-			if (conf_get_num(peer, "Phase", 0) != 1) {
-				log_print("exchange_establish: "
-				    "[%s]:ISAKMP-peer's (%s) phase is not 1",
-				    name, peer);
-				return;
-			}
-			/*
-			 * XXX We're losing information here (what the
-			 * original finalize routine was. As a result, if an
-			 * exchange does not manage to get through, there may
-			 * be application-specific information that won't get
-			 * cleaned up, since no error signalling will be done.
-			 * This is the case with dynamic SAs and PFKEY.
-		         */
-			exchange_establish(peer, exchange_establish_finalize,
-			    name);
-			exchange = exchange_lookup_by_name(peer, 1);
-			/*
-			 * If the exchange was correctly initialized, add the
-			 * original finalization routine; otherwise, call it
-			 * directly.
-		         */
-			if (exchange)
-				exchange_add_finalization(exchange, finalize,
-				    arg);
-			else
-				finalize(0, arg, 1);	/* Indicate failure */
-			return;
-		} else
-			exchange_establish_p2(isakmp_sa, 0, name, 0, finalize,
-			    arg);
-		break;
-
-	default:
-		log_print("exchange_establish: "
-		    "peer \"%s\" does not have a correct phase (%d)",
-		    name, phase);
-		break;
-	}
-}