516 lines
12 KiB
C
516 lines
12 KiB
C
/*
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* Copyright (C) 2007 Martin Willi
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* Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "ike_config.h"
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#include <daemon.h>
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#include <hydra.h>
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#include <encoding/payloads/cp_payload.h>
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typedef struct private_ike_config_t private_ike_config_t;
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/**
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* Private members of a ike_config_t task.
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*/
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struct private_ike_config_t {
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/**
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* Public methods and task_t interface.
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*/
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ike_config_t public;
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/**
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* Assigned IKE_SA.
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*/
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ike_sa_t *ike_sa;
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/**
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* Are we the initiator?
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*/
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bool initiator;
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/**
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* Received list of virtual IPs, host_t*
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*/
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linked_list_t *vips;
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/**
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* list of attributes requested and its handler, entry_t
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*/
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linked_list_t *requested;
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};
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/**
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* Entry for a requested attribute and the requesting handler
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*/
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typedef struct {
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/** attribute requested */
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configuration_attribute_type_t type;
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/** handler requesting this attribute */
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attribute_handler_t *handler;
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} entry_t;
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/**
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* build INTERNAL_IPV4/6_ADDRESS attribute from virtual ip
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*/
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static configuration_attribute_t *build_vip(host_t *vip)
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{
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configuration_attribute_type_t type;
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chunk_t chunk, prefix;
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if (vip->get_family(vip) == AF_INET)
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{
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type = INTERNAL_IP4_ADDRESS;
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if (vip->is_anyaddr(vip))
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{
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chunk = chunk_empty;
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}
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else
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{
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chunk = vip->get_address(vip);
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}
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}
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else
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{
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type = INTERNAL_IP6_ADDRESS;
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if (vip->is_anyaddr(vip))
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{
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chunk = chunk_empty;
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}
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else
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{
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prefix = chunk_alloca(1);
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*prefix.ptr = 64;
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chunk = vip->get_address(vip);
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chunk = chunk_cata("cc", chunk, prefix);
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}
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}
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return configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE,
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type, chunk);
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}
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/**
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* Handle a received attribute as initiator
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*/
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static void handle_attribute(private_ike_config_t *this,
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configuration_attribute_t *ca)
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{
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attribute_handler_t *handler = NULL;
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enumerator_t *enumerator;
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entry_t *entry;
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/* find the handler which requested this attribute */
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enumerator = this->requested->create_enumerator(this->requested);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->type == ca->get_type(ca))
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{
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handler = entry->handler;
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this->requested->remove_at(this->requested, enumerator);
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free(entry);
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break;
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}
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}
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enumerator->destroy(enumerator);
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/* and pass it to the handle function */
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handler = hydra->attributes->handle(hydra->attributes,
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this->ike_sa->get_other_id(this->ike_sa), handler,
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ca->get_type(ca), ca->get_chunk(ca));
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if (handler)
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{
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this->ike_sa->add_configuration_attribute(this->ike_sa,
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handler, ca->get_type(ca), ca->get_chunk(ca));
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}
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}
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/**
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* process a single configuration attribute
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*/
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static void process_attribute(private_ike_config_t *this,
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configuration_attribute_t *ca)
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{
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host_t *ip;
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chunk_t addr;
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int family = AF_INET6;
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switch (ca->get_type(ca))
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{
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case INTERNAL_IP4_ADDRESS:
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family = AF_INET;
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/* fall */
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case INTERNAL_IP6_ADDRESS:
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{
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addr = ca->get_chunk(ca);
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if (addr.len == 0)
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{
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ip = host_create_any(family);
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}
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else
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{
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/* skip prefix byte in IPv6 payload*/
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if (family == AF_INET6)
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{
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addr.len--;
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}
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ip = host_create_from_chunk(family, addr, 0);
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}
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if (ip)
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{
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this->vips->insert_last(this->vips, ip);
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}
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break;
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}
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case INTERNAL_IP4_SERVER:
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case INTERNAL_IP6_SERVER:
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/* assume it's a Windows client if we see proprietary attributes */
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this->ike_sa->enable_extension(this->ike_sa, EXT_MS_WINDOWS);
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/* fall */
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default:
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{
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if (this->initiator)
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{
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handle_attribute(this, ca);
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}
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}
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}
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}
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/**
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* Scan for configuration payloads and attributes
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*/
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static void process_payloads(private_ike_config_t *this, message_t *message)
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{
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enumerator_t *enumerator, *attributes;
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payload_t *payload;
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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if (payload->get_type(payload) == CONFIGURATION)
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{
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cp_payload_t *cp = (cp_payload_t*)payload;
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configuration_attribute_t *ca;
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switch (cp->get_type(cp))
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{
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case CFG_REQUEST:
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case CFG_REPLY:
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{
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attributes = cp->create_attribute_enumerator(cp);
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while (attributes->enumerate(attributes, &ca))
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{
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DBG2(DBG_IKE, "processing %N attribute",
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configuration_attribute_type_names, ca->get_type(ca));
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process_attribute(this, ca);
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}
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attributes->destroy(attributes);
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break;
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}
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default:
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DBG1(DBG_IKE, "ignoring %N config payload",
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config_type_names, cp->get_type(cp));
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break;
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}
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}
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}
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enumerator->destroy(enumerator);
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}
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METHOD(task_t, build_i, status_t,
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private_ike_config_t *this, message_t *message)
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{
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if (message->get_message_id(message) == 1)
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{ /* in first IKE_AUTH only */
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cp_payload_t *cp = NULL;
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enumerator_t *enumerator;
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attribute_handler_t *handler;
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peer_cfg_t *config;
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configuration_attribute_type_t type;
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chunk_t data;
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linked_list_t *vips;
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host_t *host;
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vips = linked_list_create();
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/* reuse virtual IP if we already have one */
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enumerator = this->ike_sa->create_virtual_ip_enumerator(this->ike_sa,
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TRUE);
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while (enumerator->enumerate(enumerator, &host))
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{
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vips->insert_last(vips, host);
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}
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enumerator->destroy(enumerator);
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if (vips->get_count(vips) == 0)
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{
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config = this->ike_sa->get_peer_cfg(this->ike_sa);
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enumerator = config->create_virtual_ip_enumerator(config);
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while (enumerator->enumerate(enumerator, &host))
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{
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vips->insert_last(vips, host);
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}
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enumerator->destroy(enumerator);
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}
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if (vips->get_count(vips))
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{
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cp = cp_payload_create_type(CONFIGURATION, CFG_REQUEST);
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enumerator = vips->create_enumerator(vips);
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while (enumerator->enumerate(enumerator, &host))
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{
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cp->add_attribute(cp, build_vip(host));
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}
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enumerator->destroy(enumerator);
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}
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enumerator = hydra->attributes->create_initiator_enumerator(
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hydra->attributes,
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this->ike_sa->get_other_id(this->ike_sa), vips);
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while (enumerator->enumerate(enumerator, &handler, &type, &data))
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{
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configuration_attribute_t *ca;
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entry_t *entry;
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/* create configuration attribute */
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DBG2(DBG_IKE, "building %N attribute",
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configuration_attribute_type_names, type);
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ca = configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE,
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type, data);
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if (!cp)
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{
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cp = cp_payload_create_type(CONFIGURATION, CFG_REQUEST);
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}
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cp->add_attribute(cp, ca);
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/* save handler along with requested type */
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entry = malloc_thing(entry_t);
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entry->type = type;
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entry->handler = handler;
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this->requested->insert_last(this->requested, entry);
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}
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enumerator->destroy(enumerator);
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vips->destroy(vips);
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if (cp)
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{
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message->add_payload(message, (payload_t*)cp);
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}
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}
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return NEED_MORE;
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}
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METHOD(task_t, process_r, status_t,
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private_ike_config_t *this, message_t *message)
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{
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if (message->get_message_id(message) == 1)
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{ /* in first IKE_AUTH only */
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process_payloads(this, message);
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}
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return NEED_MORE;
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}
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METHOD(task_t, build_r, status_t,
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private_ike_config_t *this, message_t *message)
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{
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if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
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{ /* in last IKE_AUTH exchange */
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enumerator_t *enumerator;
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configuration_attribute_type_t type;
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chunk_t value;
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cp_payload_t *cp = NULL;
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peer_cfg_t *config;
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identification_t *id;
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linked_list_t *vips, *pools;
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host_t *requested;
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id = this->ike_sa->get_other_eap_id(this->ike_sa);
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config = this->ike_sa->get_peer_cfg(this->ike_sa);
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vips = linked_list_create();
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pools = linked_list_create();
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this->ike_sa->clear_virtual_ips(this->ike_sa, FALSE);
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enumerator = this->vips->create_enumerator(this->vips);
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while (enumerator->enumerate(enumerator, &requested))
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{
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enumerator_t *poolenum;
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char *pool;
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host_t *found = NULL;
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/* query all pools until we get an address */
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DBG1(DBG_IKE, "peer requested virtual IP %H", requested);
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poolenum = config->create_pool_enumerator(config);
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while (poolenum->enumerate(poolenum, &pool))
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{
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found = hydra->attributes->acquire_address(hydra->attributes,
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pool, id, requested);
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if (!found)
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{
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continue;
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}
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DBG1(DBG_IKE, "assigning virtual IP %H to peer '%Y'", found, id);
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this->ike_sa->add_virtual_ip(this->ike_sa, FALSE, found);
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if (!cp)
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{
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cp = cp_payload_create_type(CONFIGURATION, CFG_REPLY);
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}
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cp->add_attribute(cp, build_vip(found));
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/* use pool to request other attributes */
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if (pools->find_first(pools, NULL, (void**)&pool) == NOT_FOUND)
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{
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pools->insert_last(pools, pool);
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}
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vips->insert_last(vips, found);
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break;
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}
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poolenum->destroy(poolenum);
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if (!found)
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{
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DBG1(DBG_IKE, "no virtual IP found for %H requested by '%Y'",
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requested, id);
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}
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}
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enumerator->destroy(enumerator);
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if (this->vips->get_count(this->vips) && !vips->get_count(vips))
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{
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DBG1(DBG_IKE, "no virtual IP found, sending %N",
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notify_type_names, INTERNAL_ADDRESS_FAILURE);
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message->add_notify(message, FALSE, INTERNAL_ADDRESS_FAILURE,
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chunk_empty);
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vips->destroy_offset(vips, offsetof(host_t, destroy));
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pools->destroy(pools);
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return SUCCESS;
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}
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/* query registered providers for additional attributes to include */
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enumerator = hydra->attributes->create_responder_enumerator(
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hydra->attributes, pools, id, vips);
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while (enumerator->enumerate(enumerator, &type, &value))
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{
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if (!cp)
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{
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cp = cp_payload_create_type(CONFIGURATION, CFG_REPLY);
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}
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DBG2(DBG_IKE, "building %N attribute",
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configuration_attribute_type_names, type);
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cp->add_attribute(cp,
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configuration_attribute_create_chunk(CONFIGURATION_ATTRIBUTE,
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type, value));
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}
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enumerator->destroy(enumerator);
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vips->destroy_offset(vips, offsetof(host_t, destroy));
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pools->destroy(pools);
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if (cp)
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{
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message->add_payload(message, (payload_t*)cp);
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}
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return SUCCESS;
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}
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return NEED_MORE;
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}
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METHOD(task_t, process_i, status_t,
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private_ike_config_t *this, message_t *message)
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{
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if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
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{ /* in last IKE_AUTH exchange */
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enumerator_t *enumerator;
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host_t *host;
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process_payloads(this, message);
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this->ike_sa->clear_virtual_ips(this->ike_sa, TRUE);
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enumerator = this->vips->create_enumerator(this->vips);
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while (enumerator->enumerate(enumerator, &host))
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{
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if (!host->is_anyaddr(host))
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{
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this->ike_sa->add_virtual_ip(this->ike_sa, TRUE, host);
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}
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}
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enumerator->destroy(enumerator);
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return SUCCESS;
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}
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return NEED_MORE;
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}
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METHOD(task_t, get_type, task_type_t,
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private_ike_config_t *this)
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{
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return TASK_IKE_CONFIG;
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}
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METHOD(task_t, migrate, void,
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private_ike_config_t *this, ike_sa_t *ike_sa)
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{
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this->ike_sa = ike_sa;
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this->vips->destroy_offset(this->vips, offsetof(host_t, destroy));
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this->vips = linked_list_create();
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this->requested->destroy_function(this->requested, free);
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this->requested = linked_list_create();
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}
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METHOD(task_t, destroy, void,
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private_ike_config_t *this)
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{
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this->vips->destroy_offset(this->vips, offsetof(host_t, destroy));
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this->requested->destroy_function(this->requested, free);
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free(this);
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}
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/*
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* Described in header.
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*/
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ike_config_t *ike_config_create(ike_sa_t *ike_sa, bool initiator)
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{
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private_ike_config_t *this;
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INIT(this,
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.public = {
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.task = {
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.get_type = _get_type,
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.migrate = _migrate,
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.destroy = _destroy,
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},
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},
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.initiator = initiator,
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.ike_sa = ike_sa,
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.vips = linked_list_create(),
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.requested = linked_list_create(),
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);
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if (initiator)
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{
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this->public.task.build = _build_i;
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this->public.task.process = _process_i;
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}
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else
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{
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this->public.task.build = _build_r;
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this->public.task.process = _process_r;
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}
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return &this->public;
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}
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