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/*
* Copyright (C) 2011-2012 Reto Guadagnini
* Hochschule fuer Technik Rapperswil
*
* This program 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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.
*/
#include <unbound.h>
#include <errno.h>
#include <ldns/ldns.h>
#include <string.h>
#include <library.h>
#include <utils/debug.h>
#include "unbound_resolver.h"
#include "unbound_response.h"
/* DNS resolver configuration and DNSSEC trust anchors */
#define RESOLV_CONF_FILE "/etc/resolv.conf"
#define TRUST_ANCHOR_FILE IPSEC_CONFDIR "/ipsec.d/dnssec.keys"
typedef struct private_resolver_t private_resolver_t;
/**
* private data of a unbound_resolver_t object.
*/
struct private_resolver_t {
/**
* Public data
*/
resolver_t public;
/**
* private unbound resolver handle (unbound context)
*/
struct ub_ctx *ctx;
};
/**
* query method implementation
*/
METHOD(resolver_t, query, resolver_response_t*,
private_resolver_t *this, char *domain, rr_class_t rr_class,
rr_type_t rr_type)
{
unbound_response_t *response = NULL;
struct ub_result *result = NULL;
int ub_retval;
ub_retval = ub_resolve(this->ctx, domain, rr_type, rr_class, &result);
if (ub_retval)
{
DBG1(DBG_LIB, "unbound resolver error: %s", ub_strerror(ub_retval));
ub_resolve_free(result);
return NULL;
}
response = unbound_response_create_frm_libub_response(result);
if (!response)
{
DBG1(DBG_LIB, "unbound resolver failed to create response");
ub_resolve_free(result);
return NULL;
}
ub_resolve_free(result);
return (resolver_response_t*)response;
}
/**
* destroy method implementation
*/
METHOD(resolver_t, destroy, void,
private_resolver_t *this)
{
ub_ctx_delete(this->ctx);
free(this);
}
/*
* Described in header.
*/
resolver_t *unbound_resolver_create(void)
{
private_resolver_t *this;
int ub_retval = 0;
char *resolv_conf, *trust_anchors, *dlv_anchors;
resolv_conf = lib->settings->get_str(lib->settings,
"libstrongswan.plugins.unbound.resolv_conf",
RESOLV_CONF_FILE);
trust_anchors = lib->settings->get_str(lib->settings,
"libstrongswan.plugins.unbound.trust_anchors",
TRUST_ANCHOR_FILE);
dlv_anchors = lib->settings->get_str(lib->settings,
"libstrongswan.plugins.unbound.dlv_anchors",
NULL);
INIT(this,
.public = {
.query = _query,
.destroy = _destroy,
},
);
this->ctx = ub_ctx_create();
if (!this->ctx)
{
DBG1(DBG_LIB, "failed to create unbound resolver context");
destroy(this);
return NULL;
}
DBG2(DBG_CFG, "loading unbound resolver config from '%s'", resolv_conf);
ub_retval = ub_ctx_resolvconf(this->ctx, resolv_conf);
if (ub_retval)
{
DBG1(DBG_CFG, "failed to read the resolver config: %s (%s)",
ub_strerror(ub_retval), strerror(errno));
destroy(this);
return NULL;
}
DBG2(DBG_CFG, "loading unbound trust anchors from '%s'", trust_anchors);
ub_retval = ub_ctx_add_ta_file(this->ctx, trust_anchors);
if (ub_retval)
{
DBG1(DBG_CFG, "failed to load trust anchors: %s (%s)",
ub_strerror(ub_retval), strerror(errno));
}
if (dlv_anchors)
{
DBG2(DBG_CFG, "loading trusted keys for DLV from '%s'", dlv_anchors);
ub_retval = ub_ctx_set_option(this->ctx, "dlv-anchor-file:",
dlv_anchors);
if (ub_retval)
{
DBG1(DBG_CFG, "failed to load trusted keys for DLV: %s (%s)",
ub_strerror(ub_retval), strerror(errno));
}
}
return &this->public;
}
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