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// Copyright (C) 2014-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <asiolink/io_address.h>
#include <dhcpsrv/cfgmgr.h>
#include <dhcpsrv/parsers/host_reservation_parser.h>
#include <boost/foreach.hpp>
#include <boost/lexical_cast.hpp>
#include <string>
using namespace isc::asiolink;
using namespace isc::data;
namespace {
/// @brief Returns set of the supported parameters for DHCPv4.
///
/// This function returns the set of supported parameters for
/// host reservation in DHCPv4.
const std::set<std::string>& getSupportedParams4() {
static std::set<std::string> params_set;
if (params_set.empty()) {
const char* params[] = {
"duid", "hw-address", "hostname", "ip-address", NULL
};
for (int i = 0; params[i] != NULL; ++i) {
params_set.insert(std::string(params[i]));
}
}
return (params_set);
}
/// @brief Returns set of the supported parameters for DHCPv4.
///
/// This function returns the set of supported parameters for
/// host reservation in DHCPv6.
const std::set<std::string>& getSupportedParams6() {
static std::set<std::string> params_set;
if (params_set.empty()) {
const char* params[] = {
"duid", "hw-address", "hostname", "ip-addresses", "prefixes", NULL
};
for (int i = 0; params[i] != NULL; ++i) {
params_set.insert(std::string(params[i]));
}
}
return (params_set);
}
}
namespace isc {
namespace dhcp {
HostReservationParser::HostReservationParser(const SubnetID& subnet_id)
: DhcpConfigParser(), subnet_id_(subnet_id) {
}
void
HostReservationParser::build(isc::data::ConstElementPtr reservation_data) {
std::string identifier;
std::string identifier_name;
std::string hostname;
// Gather those parameters that are common for both IPv4 and IPv6
// reservations.
BOOST_FOREACH(ConfigPair element, reservation_data->mapValue()) {
try {
// Check if we support this parameter.
if (!isSupportedParameter(element.first)) {
isc_throw(DhcpConfigError, "unsupported configuration"
" parameter '" << element.first << "'");
}
if (element.first == "hw-address" || element.first == "duid") {
if (!identifier_name.empty()) {
isc_throw(DhcpConfigError, "the 'hw-address' and 'duid'"
" parameters are mutually exclusive");
}
identifier = element.second->stringValue();
identifier_name = element.first;
} else if (element.first == "hostname") {
hostname = element.second->stringValue();
}
} catch (const std::exception& ex) {
// Append line number where the error occurred.
isc_throw(DhcpConfigError, ex.what() << " ("
<< element.second->getPosition() << ")");
}
}
try {
// hw-address or duid is a must.
if (identifier_name.empty()) {
isc_throw(DhcpConfigError, "'hw-address' or 'duid' is a required"
" parameter for host reservation");
}
// Create a host object from the basic parameters we already parsed.
host_.reset(new Host(identifier, identifier_name, SubnetID(0),
SubnetID(0), IOAddress("0.0.0.0"), hostname));
} catch (const std::exception& ex) {
// Append line number where the error occurred.
isc_throw(DhcpConfigError, ex.what() << " ("
<< reservation_data->getPosition() << ")");
}
}
void
HostReservationParser::addHost(isc::data::ConstElementPtr reservation_data) {
try {
CfgMgr::instance().getStagingCfg()->getCfgHosts()->add(host_);
} catch (const std::exception& ex) {
// Append line number to the exception string.
isc_throw(DhcpConfigError, ex.what() << " ("
<< reservation_data->getPosition() << ")");
}
}
HostReservationParser4::HostReservationParser4(const SubnetID& subnet_id)
: HostReservationParser(subnet_id) {
}
void
HostReservationParser4::build(isc::data::ConstElementPtr reservation_data) {
HostReservationParser::build(reservation_data);
host_->setIPv4SubnetID(subnet_id_);
BOOST_FOREACH(ConfigPair element, reservation_data->mapValue()) {
try {
if (element.first == "ip-address") {
host_->setIPv4Reservation(IOAddress(element.second->
stringValue()));
}
}
catch (const std::exception& ex) {
// Append line number where the error occurred.
isc_throw(DhcpConfigError, ex.what() << " ("
<< reservation_data->getPosition() << ")");
}
}
addHost(reservation_data);
}
bool
HostReservationParser4::isSupportedParameter(const std::string& param_name) const {
return (getSupportedParams4().count(param_name) > 0);
}
HostReservationParser6::HostReservationParser6(const SubnetID& subnet_id)
: HostReservationParser(subnet_id) {
}
void
HostReservationParser6::build(isc::data::ConstElementPtr reservation_data) {
HostReservationParser::build(reservation_data);
host_->setIPv6SubnetID(subnet_id_);
BOOST_FOREACH(ConfigPair element, reservation_data->mapValue()) {
if (element.first == "ip-addresses" || element.first == "prefixes") {
BOOST_FOREACH(ConstElementPtr prefix_element,
element.second->listValue()) {
try {
// For the IPv6 address the prefix length is 128 and the
// value specified in the list is a reserved address.
IPv6Resrv::Type resrv_type = IPv6Resrv::TYPE_NA;
std::string prefix = prefix_element->stringValue();
uint8_t prefix_len = 128;
// If we're dealing with prefixes, instead of addresses,
// we will have to extract the prefix length from the value
// specified in the following format: 2001:db8:2000::/64.
if (element.first == "prefixes") {
// The slash is mandatory for prefixes. If there is no
// slash, return an error.
size_t len_pos = prefix.find('/');
if (len_pos == std::string::npos) {
isc_throw(DhcpConfigError, "prefix reservation"
" requires prefix length be specified"
" in '" << prefix << "'");
// If there is nothing after the slash, we should also
// report an error.
} else if (len_pos >= prefix.length() - 1) {
isc_throw(DhcpConfigError, "prefix '" << prefix
<< "' requires length after '/'");
}
// Convert the prefix length from the string to the
// number. Note, that we don't use the uint8_t type
// as the lexical cast would expect a chracter, e.g.
// 'a', instead of prefix length, e.g. '64'.
try {
prefix_len = boost::lexical_cast<
unsigned int>(prefix.substr(len_pos + 1));
} catch (const boost::bad_lexical_cast&) {
isc_throw(DhcpConfigError, "prefix length value '"
<< prefix.substr(len_pos + 1)
<< "' is invalid");
}
// Remove the slash character and the prefix length
// from the parsed value.
prefix.erase(len_pos);
// Finally, set the reservation type.
resrv_type = IPv6Resrv::TYPE_PD;
}
// Create a reservation for an address or prefix.
host_->addReservation(IPv6Resrv(resrv_type,
IOAddress(prefix),
prefix_len));
} catch (const std::exception& ex) {
// Append line number where the error occurred.
isc_throw(DhcpConfigError, ex.what() << " ("
<< prefix_element->getPosition() << ")");
}
}
}
}
// This may fail, but the addHost function will handle this on its own.
addHost(reservation_data);
}
bool
HostReservationParser6::isSupportedParameter(const std::string& param_name) const {
return (getSupportedParams6().count(param_name) > 0);
}
} // end of namespace isc::dhcp
} // end of namespace isc
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