diff options
Diffstat (limited to 'src/bin/dhcp4/json_config_parser.cc')
| -rw-r--r-- | src/bin/dhcp4/json_config_parser.cc | 836 |
1 files changed, 836 insertions, 0 deletions
diff --git a/src/bin/dhcp4/json_config_parser.cc b/src/bin/dhcp4/json_config_parser.cc new file mode 100644 index 0000000..4816fcc --- /dev/null +++ b/src/bin/dhcp4/json_config_parser.cc @@ -0,0 +1,836 @@ +// Copyright (C) 2012-2022 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 <cc/command_interpreter.h> +#include <config/command_mgr.h> +#include <database/dbaccess_parser.h> +#include <database/backend_selector.h> +#include <database/server_selector.h> +#include <dhcp4/dhcp4_log.h> +#include <dhcp4/dhcp4_srv.h> +#include <dhcp4/json_config_parser.h> +#include <dhcp/libdhcp++.h> +#include <dhcp/option_definition.h> +#include <dhcpsrv/cb_ctl_dhcp4.h> +#include <dhcpsrv/cfg_option.h> +#include <dhcpsrv/cfgmgr.h> +#include <dhcpsrv/config_backend_dhcp4_mgr.h> +#include <dhcpsrv/db_type.h> +#include <dhcpsrv/parsers/client_class_def_parser.h> +#include <dhcpsrv/parsers/dhcp_parsers.h> +#include <dhcpsrv/parsers/expiration_config_parser.h> +#include <dhcpsrv/parsers/host_reservation_parser.h> +#include <dhcpsrv/parsers/host_reservations_list_parser.h> +#include <dhcpsrv/parsers/ifaces_config_parser.h> +#include <dhcpsrv/parsers/multi_threading_config_parser.h> +#include <dhcpsrv/parsers/option_data_parser.h> +#include <dhcpsrv/parsers/dhcp_queue_control_parser.h> +#include <dhcpsrv/parsers/simple_parser4.h> +#include <dhcpsrv/parsers/shared_networks_list_parser.h> +#include <dhcpsrv/parsers/sanity_checks_parser.h> +#include <dhcpsrv/host_data_source_factory.h> +#include <dhcpsrv/timer_mgr.h> +#include <hooks/hooks_manager.h> +#include <hooks/hooks_parser.h> +#include <process/config_ctl_parser.h> +#include <util/encode/hex.h> +#include <util/multi_threading_mgr.h> +#include <util/strutil.h> + +#include <boost/algorithm/string.hpp> +#include <boost/foreach.hpp> +#include <boost/lexical_cast.hpp> + +#include <iomanip> +#include <iostream> +#include <limits> +#include <map> +#include <netinet/in.h> +#include <vector> + +using namespace std; +using namespace isc; +using namespace isc::data; +using namespace isc::dhcp; +using namespace isc::asiolink; +using namespace isc::hooks; +using namespace isc::process; +using namespace isc::config; +using namespace isc::util; + +namespace { + +/// @brief Parser that takes care of global DHCPv4 parameters and utility +/// functions that work on global level. +/// +/// This class is a collection of utility method that either handle +/// global parameters (see @ref parse), or conducts operations on +/// global level (see @ref sanityChecks and @ref copySubnets4). +/// +/// See @ref parse method for a list of supported parameters. +class Dhcp4ConfigParser : public isc::data::SimpleParser { +public: + + /// @brief Sets global parameters in staging configuration + /// + /// @param global global configuration scope + /// @param cfg Server configuration (parsed parameters will be stored here) + /// + /// Currently this method sets the following global parameters: + /// + /// - echo-client-id + /// - decline-probation-period + /// - dhcp4o6-port + /// - user-context + /// + /// @throw DhcpConfigError if parameters are missing or + /// or having incorrect values. + void parse(const SrvConfigPtr& cfg, const ConstElementPtr& global) { + + // Set whether v4 server is supposed to echo back client-id + // (yes = RFC6842 compatible, no = backward compatibility) + bool echo_client_id = getBoolean(global, "echo-client-id"); + cfg->setEchoClientId(echo_client_id); + + // Set the probation period for decline handling. + uint32_t probation_period = + getUint32(global, "decline-probation-period"); + cfg->setDeclinePeriod(probation_period); + + // Set the DHCPv4-over-DHCPv6 interserver port. + uint16_t dhcp4o6_port = getUint16(global, "dhcp4o6-port"); + cfg->setDhcp4o6Port(dhcp4o6_port); + + // Set the global user context. + ConstElementPtr user_context = global->get("user-context"); + if (user_context) { + cfg->setContext(user_context); + } + + // Set the server's logical name + std::string server_tag = getString(global, "server-tag"); + cfg->setServerTag(server_tag); + } + + /// @brief Sets global parameters before other parameters are parsed. + /// + /// This method sets selected global parameters before other parameters + /// are parsed. This is important when the behavior of the parsers + /// run later depends on these global parameters. + /// + /// Currently this method sets the following global parameters: + /// - ip-reservations-unique + /// + /// @param global global configuration scope + /// @param cfg Server configuration (parsed parameters will be stored here) + void parseEarly(const SrvConfigPtr& cfg, const ConstElementPtr& global) { + // Set ip-reservations-unique flag. + bool ip_reservations_unique = getBoolean(global, "ip-reservations-unique"); + cfg->setIPReservationsUnique(ip_reservations_unique); + } + + /// @brief Copies subnets from shared networks to regular subnets container + /// + /// @param from pointer to shared networks container (copy from here) + /// @param dest pointer to cfg subnets4 (copy to here) + /// @throw BadValue if any pointer is missing + /// @throw DhcpConfigError if there are duplicates (or other subnet defects) + void + copySubnets4(const CfgSubnets4Ptr& dest, const CfgSharedNetworks4Ptr& from) { + + if (!dest || !from) { + isc_throw(BadValue, "Unable to copy subnets: at least one pointer is null"); + } + + const SharedNetwork4Collection* networks = from->getAll(); + if (!networks) { + // Nothing to copy. Technically, it should return a pointer to empty + // container, but let's handle null pointer as well. + return; + } + + // Let's go through all the networks one by one + for (auto net = networks->begin(); net != networks->end(); ++net) { + + // For each network go through all the subnets in it. + const Subnet4SimpleCollection* subnets = (*net)->getAllSubnets(); + if (!subnets) { + // Shared network without subnets it weird, but we decided to + // accept such configurations. + continue; + } + + // For each subnet, add it to a list of regular subnets. + for (auto subnet = subnets->begin(); subnet != subnets->end(); ++subnet) { + dest->add(*subnet); + } + } + } + + /// @brief Conducts global sanity checks + /// + /// This method is very simple now, but more sanity checks are expected + /// in the future. + /// + /// @param cfg - the parsed structure + /// @param global global Dhcp4 scope + /// @throw DhcpConfigError in case of issues found + void + sanityChecks(const SrvConfigPtr& cfg, const ConstElementPtr& global) { + + /// Global lifetime sanity checks + cfg->sanityChecksLifetime("valid-lifetime"); + + /// Shared network sanity checks + const SharedNetwork4Collection* networks = cfg->getCfgSharedNetworks4()->getAll(); + if (networks) { + sharedNetworksSanityChecks(*networks, global->get("shared-networks")); + } + } + + /// @brief Sanity checks for shared networks + /// + /// This method verifies if there are no issues with shared networks. + /// @param networks pointer to shared networks being checked + /// @param json shared-networks element + /// @throw DhcpConfigError if issues are encountered + void + sharedNetworksSanityChecks(const SharedNetwork4Collection& networks, + ConstElementPtr json) { + + /// @todo: in case of errors, use json to extract line numbers. + if (!json) { + // No json? That means that the shared-networks was never specified + // in the config. + return; + } + + // Used for names uniqueness checks. + std::set<string> names; + + // Let's go through all the networks one by one + for (auto net = networks.begin(); net != networks.end(); ++net) { + string txt; + + // Let's check if all subnets have either the same interface + // or don't have the interface specified at all. + bool authoritative = (*net)->getAuthoritative(); + string iface = (*net)->getIface(); + + const Subnet4SimpleCollection* subnets = (*net)->getAllSubnets(); + if (subnets) { + // For each subnet, add it to a list of regular subnets. + for (auto subnet = subnets->begin(); subnet != subnets->end(); ++subnet) { + if ((*subnet)->getAuthoritative() != authoritative) { + isc_throw(DhcpConfigError, "Subnet " << boolalpha + << (*subnet)->toText() + << " has different authoritative setting " + << (*subnet)->getAuthoritative() + << " than the shared-network itself: " + << authoritative); + } + + if (iface.empty()) { + iface = (*subnet)->getIface(); + continue; + } + + if ((*subnet)->getIface().empty()) { + continue; + } + + if ((*subnet)->getIface() != iface) { + isc_throw(DhcpConfigError, "Subnet " << (*subnet)->toText() + << " has specified interface " << (*subnet)->getIface() + << ", but earlier subnet in the same shared-network" + << " or the shared-network itself used " << iface); + } + + // Let's collect the subnets in case we later find out the + // subnet doesn't have a mandatory name. + txt += (*subnet)->toText() + " "; + } + } + + // Next, let's check name of the shared network. + if ((*net)->getName().empty()) { + isc_throw(DhcpConfigError, "Shared-network with subnets " + << txt << " is missing mandatory 'name' parameter"); + } + + // Is it unique? + if (names.find((*net)->getName()) != names.end()) { + isc_throw(DhcpConfigError, "A shared-network with " + "name " << (*net)->getName() << " defined twice."); + } + names.insert((*net)->getName()); + + } + } +}; + +} // anonymous namespace + +namespace isc { +namespace dhcp { + +/// @brief Initialize the command channel based on the staging configuration +/// +/// Only close the current channel, if the new channel configuration is +/// different. This avoids disconnecting a client and hence not sending them +/// a command result, unless they specifically alter the channel configuration. +/// In that case the user simply has to accept they'll be disconnected. +/// +void configureCommandChannel() { + // Get new socket configuration. + ConstElementPtr sock_cfg = + CfgMgr::instance().getStagingCfg()->getControlSocketInfo(); + + // Get current socket configuration. + ConstElementPtr current_sock_cfg = + CfgMgr::instance().getCurrentCfg()->getControlSocketInfo(); + + // Determine if the socket configuration has changed. It has if + // both old and new configuration is specified but respective + // data elements aren't equal. + bool sock_changed = (sock_cfg && current_sock_cfg && + !sock_cfg->equals(*current_sock_cfg)); + + // If the previous or new socket configuration doesn't exist or + // the new configuration differs from the old configuration we + // close the existing socket and open a new socket as appropriate. + // Note that closing an existing socket means the client will not + // receive the configuration result. + if (!sock_cfg || !current_sock_cfg || sock_changed) { + // Close the existing socket (if any). + isc::config::CommandMgr::instance().closeCommandSocket(); + + if (sock_cfg) { + // This will create a control socket and install the external + // socket in IfaceMgr. That socket will be monitored when + // Dhcp4Srv::receivePacket() calls IfaceMgr::receive4() and + // callback in CommandMgr will be called, if necessary. + isc::config::CommandMgr::instance().openCommandSocket(sock_cfg); + } + } +} + +isc::data::ConstElementPtr +configureDhcp4Server(Dhcpv4Srv& server, isc::data::ConstElementPtr config_set, + bool check_only) { + if (!config_set) { + ConstElementPtr answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, + string("Can't parse NULL config")); + return (answer); + } + + LOG_DEBUG(dhcp4_logger, DBG_DHCP4_COMMAND, DHCP4_CONFIG_START) + .arg(server.redactConfig(config_set)->str()); + + // Before starting any subnet operations, let's reset the subnet-id counter, + // so newly recreated configuration starts with first subnet-id equal 1. + Subnet::resetSubnetID(); + + // Close DHCP sockets and remove any existing timers. + if (!check_only) { + IfaceMgr::instance().closeSockets(); + TimerMgr::instance()->unregisterTimers(); + server.discardPackets(); + server.getCBControl()->reset(); + } + + // Revert any runtime option definitions configured so far and not committed. + LibDHCP::revertRuntimeOptionDefs(); + // Let's set empty container in case a user hasn't specified any configuration + // for option definitions. This is equivalent to committing empty container. + LibDHCP::setRuntimeOptionDefs(OptionDefSpaceContainer()); + + // Print the list of known backends. + HostDataSourceFactory::printRegistered(); + + // Answer will hold the result. + ConstElementPtr answer; + // Rollback informs whether error occurred and original data + // have to be restored to global storages. + bool rollback = false; + // Global parameter name in case of an error. + string parameter_name; + ElementPtr mutable_cfg; + SrvConfigPtr srv_config; + try { + // Get the staging configuration. + srv_config = CfgMgr::instance().getStagingCfg(); + + // This is a way to convert ConstElementPtr to ElementPtr. + // We need a config that can be edited, because we will insert + // default values and will insert derived values as well. + mutable_cfg = boost::const_pointer_cast<Element>(config_set); + + // Relocate dhcp-ddns parameters that have moved to global scope. + // Rule is that a global value overrides the dhcp-ddns value, so + // we need to do this before we apply global defaults. + // Note this is done for backward compatibility. + srv_config->moveDdnsParams(mutable_cfg); + + // Move from reservation mode to new reservations flags. + // @todo add warning + BaseNetworkParser::moveReservationMode(mutable_cfg); + + // Set all default values if not specified by the user. + SimpleParser4::setAllDefaults(mutable_cfg); + + // And now derive (inherit) global parameters to subnets, if not specified. + SimpleParser4::deriveParameters(mutable_cfg); + + // In principle we could have the following code structured as a series + // of long if else if clauses. That would give a marginal performance + // boost, but would make the code less readable. We had serious issues + // with the parser code debugability, so I decided to keep it as a + // series of independent ifs. + + // This parser is used in several places. + Dhcp4ConfigParser global_parser; + + // Apply global options in the staging config, e.g. ip-reservations-unique + global_parser.parseEarly(srv_config, mutable_cfg); + + // We need definitions first + ConstElementPtr option_defs = mutable_cfg->get("option-def"); + if (option_defs) { + parameter_name = "option-def"; + OptionDefListParser parser(AF_INET); + CfgOptionDefPtr cfg_option_def = srv_config->getCfgOptionDef(); + parser.parse(cfg_option_def, option_defs); + } + + ConstElementPtr option_datas = mutable_cfg->get("option-data"); + if (option_datas) { + parameter_name = "option-data"; + OptionDataListParser parser(AF_INET); + CfgOptionPtr cfg_option = srv_config->getCfgOption(); + parser.parse(cfg_option, option_datas); + } + + ConstElementPtr control_socket = mutable_cfg->get("control-socket"); + if (control_socket) { + parameter_name = "control-socket"; + ControlSocketParser parser; + parser.parse(*srv_config, control_socket); + } + + ConstElementPtr multi_threading = mutable_cfg->get("multi-threading"); + if (multi_threading) { + parameter_name = "multi-threading"; + MultiThreadingConfigParser parser; + parser.parse(*srv_config, multi_threading); + } + + /// depends on "multi-threading" being enabled, so it must come after. + ConstElementPtr queue_control = mutable_cfg->get("dhcp-queue-control"); + if (queue_control) { + parameter_name = "dhcp-queue-control"; + DHCPQueueControlParser parser; + srv_config->setDHCPQueueControl(parser.parse(queue_control)); + } + + /// depends on "multi-threading" being enabled, so it must come after. + ConstElementPtr reservations_lookup_first = mutable_cfg->get("reservations-lookup-first"); + if (reservations_lookup_first) { + parameter_name = "reservations-lookup-first"; + if (MultiThreadingMgr::instance().getMode()) { + LOG_WARN(dhcp4_logger, DHCP4_RESERVATIONS_LOOKUP_FIRST_ENABLED); + } + srv_config->setReservationsLookupFirst(reservations_lookup_first->boolValue()); + } + + ConstElementPtr hr_identifiers = + mutable_cfg->get("host-reservation-identifiers"); + if (hr_identifiers) { + parameter_name = "host-reservation-identifiers"; + HostReservationIdsParser4 parser; + parser.parse(hr_identifiers); + } + + ConstElementPtr ifaces_config = mutable_cfg->get("interfaces-config"); + if (ifaces_config) { + parameter_name = "interfaces-config"; + IfacesConfigParser parser(AF_INET, check_only); + CfgIfacePtr cfg_iface = srv_config->getCfgIface(); + parser.parse(cfg_iface, ifaces_config); + } + + ConstElementPtr sanity_checks = mutable_cfg->get("sanity-checks"); + if (sanity_checks) { + parameter_name = "sanity-checks"; + SanityChecksParser parser; + parser.parse(*srv_config, sanity_checks); + } + + ConstElementPtr expiration_cfg = + mutable_cfg->get("expired-leases-processing"); + if (expiration_cfg) { + parameter_name = "expired-leases-processing"; + ExpirationConfigParser parser; + parser.parse(expiration_cfg); + } + + // The hooks-libraries configuration must be parsed after parsing + // multi-threading configuration so that libraries are checked + // for multi-threading compatibility. + ConstElementPtr hooks_libraries = mutable_cfg->get("hooks-libraries"); + if (hooks_libraries) { + parameter_name = "hooks-libraries"; + HooksLibrariesParser hooks_parser; + HooksConfig& libraries = srv_config->getHooksConfig(); + hooks_parser.parse(libraries, hooks_libraries); + libraries.verifyLibraries(hooks_libraries->getPosition()); + } + + // D2 client configuration. + D2ClientConfigPtr d2_client_cfg; + + // Legacy DhcpConfigParser stuff below. + ConstElementPtr dhcp_ddns = mutable_cfg->get("dhcp-ddns"); + if (dhcp_ddns) { + parameter_name = "dhcp-ddns"; + // Apply defaults + D2ClientConfigParser::setAllDefaults(dhcp_ddns); + D2ClientConfigParser parser; + d2_client_cfg = parser.parse(dhcp_ddns); + } + + ConstElementPtr client_classes = mutable_cfg->get("client-classes"); + if (client_classes) { + parameter_name = "client-classes"; + ClientClassDefListParser parser; + ClientClassDictionaryPtr dictionary = + parser.parse(client_classes, AF_INET); + srv_config->setClientClassDictionary(dictionary); + } + + // Please move at the end when migration will be finished. + ConstElementPtr lease_database = mutable_cfg->get("lease-database"); + if (lease_database) { + parameter_name = "lease-database"; + db::DbAccessParser parser; + std::string access_string; + parser.parse(access_string, lease_database); + CfgDbAccessPtr cfg_db_access = srv_config->getCfgDbAccess(); + cfg_db_access->setLeaseDbAccessString(access_string); + } + + ConstElementPtr hosts_database = mutable_cfg->get("hosts-database"); + if (hosts_database) { + parameter_name = "hosts-database"; + db::DbAccessParser parser; + std::string access_string; + parser.parse(access_string, hosts_database); + CfgDbAccessPtr cfg_db_access = srv_config->getCfgDbAccess(); + cfg_db_access->setHostDbAccessString(access_string); + } + + ConstElementPtr hosts_databases = mutable_cfg->get("hosts-databases"); + if (hosts_databases) { + parameter_name = "hosts-databases"; + CfgDbAccessPtr cfg_db_access = srv_config->getCfgDbAccess(); + for (auto it : hosts_databases->listValue()) { + db::DbAccessParser parser; + std::string access_string; + parser.parse(access_string, it); + cfg_db_access->setHostDbAccessString(access_string); + } + } + + // Keep relative orders of shared networks and subnets. + ConstElementPtr shared_networks = mutable_cfg->get("shared-networks"); + if (shared_networks) { + parameter_name = "shared-networks"; + /// We need to create instance of SharedNetworks4ListParser + /// and parse the list of the shared networks into the + /// CfgSharedNetworks4 object. One additional step is then to + /// add subnets from the CfgSharedNetworks4 into CfgSubnets4 + /// as well. + SharedNetworks4ListParser parser; + CfgSharedNetworks4Ptr cfg = srv_config->getCfgSharedNetworks4(); + parser.parse(cfg, shared_networks); + + // We also need to put the subnets it contains into normal + // subnets list. + global_parser.copySubnets4(srv_config->getCfgSubnets4(), cfg); + } + + ConstElementPtr subnet4 = mutable_cfg->get("subnet4"); + if (subnet4) { + parameter_name = "subnet4"; + Subnets4ListConfigParser subnets_parser; + // parse() returns number of subnets parsed. We may log it one day. + subnets_parser.parse(srv_config, subnet4); + } + + ConstElementPtr reservations = mutable_cfg->get("reservations"); + if (reservations) { + parameter_name = "reservations"; + HostCollection hosts; + HostReservationsListParser<HostReservationParser4> parser; + parser.parse(SUBNET_ID_GLOBAL, reservations, hosts); + for (auto h = hosts.begin(); h != hosts.end(); ++h) { + srv_config->getCfgHosts()->add(*h); + } + } + + ConstElementPtr config_control = mutable_cfg->get("config-control"); + if (config_control) { + parameter_name = "config-control"; + ConfigControlParser parser; + ConfigControlInfoPtr config_ctl_info = parser.parse(config_control); + CfgMgr::instance().getStagingCfg()->setConfigControlInfo(config_ctl_info); + } + + ConstElementPtr compatibility = mutable_cfg->get("compatibility"); + if (compatibility) { + for (auto kv : compatibility->mapValue()) { + if (kv.first == "lenient-option-parsing") { + CfgMgr::instance().getStagingCfg()->setLenientOptionParsing( + kv.second->boolValue()); + } + } + } + + // Make parsers grouping. + ConfigPair config_pair; + const std::map<std::string, ConstElementPtr>& values_map = + mutable_cfg->mapValue(); + + BOOST_FOREACH(config_pair, values_map) { + + parameter_name = config_pair.first; + + // These are converted to SimpleParser and are handled already above. + if ((config_pair.first == "option-def") || + (config_pair.first == "option-data") || + (config_pair.first == "control-socket") || + (config_pair.first == "multi-threading") || + (config_pair.first == "dhcp-queue-control") || + (config_pair.first == "host-reservation-identifiers") || + (config_pair.first == "interfaces-config") || + (config_pair.first == "sanity-checks") || + (config_pair.first == "expired-leases-processing") || + (config_pair.first == "hooks-libraries") || + (config_pair.first == "dhcp-ddns") || + (config_pair.first == "client-classes") || + (config_pair.first == "lease-database") || + (config_pair.first == "hosts-database") || + (config_pair.first == "hosts-databases") || + (config_pair.first == "subnet4") || + (config_pair.first == "shared-networks") || + (config_pair.first == "reservations") || + (config_pair.first == "config-control") || + (config_pair.first == "loggers") || + (config_pair.first == "compatibility")) { + continue; + } + + // As of Kea 1.6.0 we have two ways of inheriting the global parameters. + // The old method is used in JSON configuration parsers when the global + // parameters are derived into the subnets and shared networks and are + // being treated as explicitly specified. The new way used by the config + // backend is the dynamic inheritance whereby each subnet and shared + // network uses a callback function to return global parameter if it + // is not specified at lower level. This callback uses configured globals. + // We deliberately include both default and explicitly specified globals + // so as the callback can access the appropriate global values regardless + // whether they are set to a default or other value. + if ( (config_pair.first == "renew-timer") || + (config_pair.first == "rebind-timer") || + (config_pair.first == "valid-lifetime") || + (config_pair.first == "min-valid-lifetime") || + (config_pair.first == "max-valid-lifetime") || + (config_pair.first == "decline-probation-period") || + (config_pair.first == "dhcp4o6-port") || + (config_pair.first == "echo-client-id") || + (config_pair.first == "match-client-id") || + (config_pair.first == "authoritative") || + (config_pair.first == "next-server") || + (config_pair.first == "server-hostname") || + (config_pair.first == "boot-file-name") || + (config_pair.first == "server-tag") || + (config_pair.first == "reservation-mode") || + (config_pair.first == "reservations-global") || + (config_pair.first == "reservations-in-subnet") || + (config_pair.first == "reservations-out-of-pool") || + (config_pair.first == "calculate-tee-times") || + (config_pair.first == "t1-percent") || + (config_pair.first == "t2-percent") || + (config_pair.first == "cache-threshold") || + (config_pair.first == "cache-max-age") || + (config_pair.first == "hostname-char-set") || + (config_pair.first == "hostname-char-replacement") || + (config_pair.first == "ddns-send-updates") || + (config_pair.first == "ddns-override-no-update") || + (config_pair.first == "ddns-override-client-update") || + (config_pair.first == "ddns-replace-client-name") || + (config_pair.first == "ddns-generated-prefix") || + (config_pair.first == "ddns-qualifying-suffix") || + (config_pair.first == "ddns-update-on-renew") || + (config_pair.first == "ddns-use-conflict-resolution") || + (config_pair.first == "store-extended-info") || + (config_pair.first == "statistic-default-sample-count") || + (config_pair.first == "statistic-default-sample-age") || + (config_pair.first == "early-global-reservations-lookup") || + (config_pair.first == "ip-reservations-unique") || + (config_pair.first == "reservations-lookup-first") || + (config_pair.first == "parked-packet-limit")) { + CfgMgr::instance().getStagingCfg()->addConfiguredGlobal(config_pair.first, + config_pair.second); + continue; + } + + // Nothing to configure for the user-context. + if (config_pair.first == "user-context") { + continue; + } + + // If we got here, no code handled this parameter, so we bail out. + isc_throw(DhcpConfigError, + "unsupported global configuration parameter: " << config_pair.first + << " (" << config_pair.second->getPosition() << ")"); + } + + // Reset parameter name. + parameter_name = "<post parsing>"; + + // Apply global options in the staging config. + global_parser.parse(srv_config, mutable_cfg); + + // This method conducts final sanity checks and tweaks. In particular, + // it checks that there is no conflict between plain subnets and those + // defined as part of shared networks. + global_parser.sanityChecks(srv_config, mutable_cfg); + + // Validate D2 client configuration. + if (!d2_client_cfg) { + d2_client_cfg.reset(new D2ClientConfig()); + } + d2_client_cfg->validateContents(); + srv_config->setD2ClientConfig(d2_client_cfg); + } catch (const isc::Exception& ex) { + LOG_ERROR(dhcp4_logger, DHCP4_PARSER_FAIL) + .arg(parameter_name).arg(ex.what()); + answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, ex.what()); + + // An error occurred, so make sure that we restore original data. + rollback = true; + } catch (...) { + // For things like bad_cast in boost::lexical_cast + LOG_ERROR(dhcp4_logger, DHCP4_PARSER_EXCEPTION).arg(parameter_name); + answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, "undefined configuration" + " processing error"); + + // An error occurred, so make sure that we restore original data. + rollback = true; + } + + if (check_only) { + rollback = true; + if (!answer) { + answer = isc::config::createAnswer(CONTROL_RESULT_SUCCESS, + "Configuration seems sane. Control-socket, hook-libraries, and D2 " + "configuration were sanity checked, but not applied."); + } + } + + // So far so good, there was no parsing error so let's commit the + // configuration. This will add created subnets and option values into + // the server's configuration. + // This operation should be exception safe but let's make sure. + if (!rollback) { + try { + + // Setup the command channel. + configureCommandChannel(); + + // No need to commit interface names as this is handled by the + // CfgMgr::commit() function. + + // Apply the staged D2ClientConfig, used to be done by parser commit + D2ClientConfigPtr cfg; + cfg = CfgMgr::instance().getStagingCfg()->getD2ClientConfig(); + CfgMgr::instance().setD2ClientConfig(cfg); + + // This occurs last as if it succeeds, there is no easy way to + // revert it. As a result, the failure to commit a subsequent + // change causes problems when trying to roll back. + HooksManager::prepareUnloadLibraries(); + static_cast<void>(HooksManager::unloadLibraries()); + const HooksConfig& libraries = + CfgMgr::instance().getStagingCfg()->getHooksConfig(); + libraries.loadLibraries(); + } catch (const isc::Exception& ex) { + LOG_ERROR(dhcp4_logger, DHCP4_PARSER_COMMIT_FAIL).arg(ex.what()); + answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, ex.what()); + + // An error occurred, so make sure to restore the original data. + rollback = true; + } catch (...) { + // For things like bad_cast in boost::lexical_cast + LOG_ERROR(dhcp4_logger, DHCP4_PARSER_COMMIT_EXCEPTION); + answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, "undefined configuration" + " parsing error"); + + // An error occurred, so make sure to restore the original data. + rollback = true; + } + } + + // Moved from the commit block to add the config backend indication. + if (!rollback) { + try { + + // If there are config backends, fetch and merge into staging config + server.getCBControl()->databaseConfigFetch(srv_config, + CBControlDHCPv4::FetchMode::FETCH_ALL); + } catch (const isc::Exception& ex) { + std::ostringstream err; + err << "during update from config backend database: " << ex.what(); + LOG_ERROR(dhcp4_logger, DHCP4_PARSER_COMMIT_FAIL).arg(err.str()); + answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, err.str()); + + // An error occurred, so make sure to restore the original data. + rollback = true; + } catch (...) { + // For things like bad_cast in boost::lexical_cast + std::ostringstream err; + err << "during update from config backend database: " + << "undefined configuration parsing error"; + LOG_ERROR(dhcp4_logger, DHCP4_PARSER_COMMIT_FAIL).arg(err.str()); + answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, err.str()); + + // An error occurred, so make sure to restore the original data. + rollback = true; + } + } + + // Rollback changes as the configuration parsing failed. + if (rollback) { + // Revert to original configuration of runtime option definitions + // in the libdhcp++. + LibDHCP::revertRuntimeOptionDefs(); + return (answer); + } + + LOG_INFO(dhcp4_logger, DHCP4_CONFIG_COMPLETE) + .arg(CfgMgr::instance().getStagingCfg()-> + getConfigSummary(SrvConfig::CFGSEL_ALL4)); + + // Everything was fine. Configuration is successful. + answer = isc::config::createAnswer(CONTROL_RESULT_SUCCESS, "Configuration successful."); + return (answer); +} + +} // namespace dhcp +} // namespace isc |