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+// Copyright (C) 2011-2023 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 <kea_version.h>
+
+#include <dhcp6/ctrl_dhcp6_srv.h>
+#include <dhcp6/dhcp6_log.h>
+#include <dhcp6/parser_context.h>
+#include <dhcp6/json_config_parser.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <exceptions/exceptions.h>
+#include <log/logger_support.h>
+#include <log/logger_manager.h>
+#include <log/output_option.h>
+#include <process/cfgrpt/config_report.h>
+#include <process/daemon.h>
+
+#include <boost/lexical_cast.hpp>
+
+#include <iostream>
+
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::process;
+using namespace std;
+
+/// This file contains entry point (main() function) for standard DHCPv6 server
+/// component of Kea software suite. It parses command-line arguments and
+/// instantiates ControlledDhcpv6Srv class that is responsible for establishing
+/// connection with msgq (receiving commands and configuration) and also
+/// creating Dhcpv6 server object as well.
+///
+/// For detailed explanation or relations between main(), ControlledDhcpv6Srv,
+/// Dhcpv6Srv and other classes, see \ref dhcpv6Session.
+
+namespace {
+
+const char* const DHCP6_NAME = "kea-dhcp6";
+
+/// @brief Prints Kea Usage and exits
+///
+/// Note: This function never returns. It terminates the process.
+void
+usage() {
+ cerr << "Kea DHCPv6 server, "
+ << "version " << VERSION
+ << " (" << PACKAGE_VERSION_TYPE << ")"
+ << endl;
+ cerr << endl;
+ cerr << "Usage: " << DHCP6_NAME
+ << " -[v|V|W] [-d] [-{c|t|T} cfgfile] [-p number] [-P number]" << endl;
+ cerr << " -v: print version number and exit" << endl;
+ cerr << " -V: print extended version and exit" << endl;
+ cerr << " -W: display the configuration report and exit" << endl;
+ cerr << " -d: debug mode with extra verbosity (former -v)" << endl;
+ cerr << " -c file: specify configuration file" << endl;
+ cerr << " -t file: check the configuration file syntax and exit" << endl;
+ cerr << " -T file: check the configuration file doing hooks load and extra "
+ << "checks and exit" << endl;
+ cerr << " -p number: specify non-standard server port number 1-65535 "
+ << "(useful for testing only)" << endl;
+ cerr << " -P number: specify non-standard client port number 1-65535 "
+ << "(useful for testing only)" << endl;
+ exit(EXIT_FAILURE);
+}
+} // namespace
+
+int
+main(int argc, char* argv[]) {
+ int ch;
+ // The default. Any other values are useful for testing only.
+ int server_port_number = DHCP6_SERVER_PORT;
+ // Not zero values are useful for testing only.
+ int client_port_number = 0;
+ bool verbose_mode = false; // Should server be verbose?
+ bool check_mode = false; // Check syntax
+ bool load_hooks = false; // Check hooks config
+
+ // The standard config file
+ std::string config_file("");
+
+ while ((ch = getopt(argc, argv, "dvVWc:p:P:t:T:")) != -1) {
+ switch (ch) {
+ case 'd':
+ verbose_mode = true;
+ break;
+
+ case 'v':
+ cout << Dhcpv6Srv::getVersion(false) << endl;
+ return (EXIT_SUCCESS);
+
+ case 'V':
+ cout << Dhcpv6Srv::getVersion(true) << endl;
+ return (EXIT_SUCCESS);
+
+ case 'W':
+ cout << isc::detail::getConfigReport() << endl;
+ return (EXIT_SUCCESS);
+
+ case 'T':
+ load_hooks = true;
+ check_mode = true;
+ config_file = optarg;
+ break;
+
+ case 't':
+ check_mode = true;
+ config_file = optarg;
+ break;
+
+ case 'c': // config file
+ config_file = optarg;
+ break;
+
+ case 'p': // server port number
+ try {
+ server_port_number = boost::lexical_cast<int>(optarg);
+ } catch (const boost::bad_lexical_cast &) {
+ cerr << "Failed to parse server port number: [" << optarg
+ << "], 1-65535 allowed." << endl;
+ usage();
+ }
+ if (server_port_number <= 0 || server_port_number > 65535) {
+ cerr << "Failed to parse server port number: [" << optarg
+ << "], 1-65535 allowed." << endl;
+ usage();
+ }
+ break;
+
+ case 'P': // client port number
+ try {
+ client_port_number = boost::lexical_cast<int>(optarg);
+ } catch (const boost::bad_lexical_cast &) {
+ cerr << "Failed to parse client port number: [" << optarg
+ << "], 1-65535 allowed." << endl;
+ usage();
+ }
+ if (client_port_number <= 0 || client_port_number > 65535) {
+ cerr << "Failed to parse client port number: [" << optarg
+ << "], 1-65535 allowed." << endl;
+ usage();
+ }
+ break;
+
+ default:
+ usage();
+ }
+ }
+
+ // Check for extraneous parameters.
+ if (argc > optind) {
+ usage();
+ }
+
+ // Configuration file is required.
+ if (config_file.empty()) {
+ cerr << "Configuration file not specified." << endl;
+ usage();
+ }
+
+ // This is the DHCPv6 server
+ CfgMgr::instance().setFamily(AF_INET6);
+
+ if (check_mode) {
+ try {
+ // We need to initialize logging, in case any error messages are to be printed.
+ // This is just a test, so we don't care about lockfile.
+ setenv("KEA_LOCKFILE_DIR", "none", 0);
+ Daemon::setDefaultLoggerName(DHCP6_ROOT_LOGGER_NAME);
+ Daemon::loggerInit(DHCP6_ROOT_LOGGER_NAME, verbose_mode);
+
+ // Check the syntax first.
+ Parser6Context parser;
+ ConstElementPtr json;
+ json = parser.parseFile(config_file, Parser6Context::PARSER_DHCP6);
+ if (!json) {
+ cerr << "No configuration found" << endl;
+ return (EXIT_FAILURE);
+ }
+ if (verbose_mode) {
+ cerr << "Syntax check OK" << endl;
+ }
+
+ // Check the logic next.
+ ConstElementPtr dhcp6 = json->get("Dhcp6");
+ if (!dhcp6) {
+ cerr << "Missing mandatory Dhcp6 element" << endl;
+ return (EXIT_FAILURE);
+ }
+ ControlledDhcpv6Srv server(0);
+ ConstElementPtr answer;
+
+ server.setProcName(DHCP6_NAME);
+
+ // Now we pass the Dhcp6 configuration to the server, but
+ // tell it to check the configuration only (check_only = true)
+ answer = configureDhcp6Server(server, dhcp6, true, load_hooks);
+
+ int status_code = 0;
+ answer = isc::config::parseAnswer(status_code, answer);
+ if (status_code == 0) {
+ return (EXIT_SUCCESS);
+ } else {
+ cerr << "Error encountered: " << answer->stringValue() << endl;
+ return (EXIT_FAILURE);
+ }
+ } catch (const std::exception& ex) {
+ cerr << "Syntax check failed with: " << ex.what() << endl;
+ }
+ return (EXIT_FAILURE);
+ }
+
+ int ret = EXIT_SUCCESS;
+ try {
+ // It is important that we set a default logger name because this name
+ // will be used when the user doesn't provide the logging configuration
+ // in the Kea configuration file.
+ Daemon::setDefaultLoggerName(DHCP6_ROOT_LOGGER_NAME);
+
+ // Initialize logging. If verbose, we'll use maximum verbosity.
+ Daemon::loggerInit(DHCP6_ROOT_LOGGER_NAME, verbose_mode);
+ LOG_DEBUG(dhcp6_logger, DBG_DHCP6_START, DHCP6_START_INFO)
+ .arg(getpid())
+ .arg(server_port_number)
+ .arg(client_port_number)
+ .arg(verbose_mode ? "yes" : "no");
+
+ LOG_INFO(dhcp6_logger, DHCP6_STARTING)
+ .arg(VERSION)
+ .arg(PACKAGE_VERSION_TYPE);
+
+ if (string(PACKAGE_VERSION_TYPE) == "development") {
+ LOG_WARN(dhcp6_logger, DHCP6_DEVELOPMENT_VERSION);
+ }
+
+ // Create the server instance.
+ ControlledDhcpv6Srv server(server_port_number, client_port_number);
+
+ // Remember verbose-mode
+ server.setVerbose(verbose_mode);
+
+ // Create our PID file.
+ server.setProcName(DHCP6_NAME);
+ server.setConfigFile(config_file);
+ server.createPIDFile();
+
+ try {
+ // Initialize the server.
+ server.init(config_file);
+ } catch (const std::exception& ex) {
+
+ // Let's log out what went wrong.
+ try {
+ // Log with the current logger, but only if it's not
+ // configured with console output so as to not log twice.
+ if (!dhcp6_logger.hasAppender(isc::log::OutputOption::DEST_CONSOLE)) {
+ LOG_ERROR(dhcp6_logger, DHCP6_INIT_FAIL).arg(ex.what());
+ }
+
+ // Log on the console as well.
+ isc::log::LoggerManager log_manager;
+ log_manager.process();
+ LOG_ERROR(dhcp6_logger, DHCP6_INIT_FAIL).arg(ex.what());
+ } catch (...) {
+ // The exception thrown during the initialization could
+ // originate from logger subsystem. Therefore LOG_ERROR()
+ // may fail as well.
+ cerr << "Failed to initialize server: " << ex.what() << endl;
+ }
+
+ return (EXIT_FAILURE);
+ }
+
+ // Tell the admin we are ready to process packets
+ LOG_INFO(dhcp6_logger, DHCP6_STARTED).arg(VERSION);
+
+ // And run the main loop of the server.
+ ret = server.run();
+
+ LOG_INFO(dhcp6_logger, DHCP6_SHUTDOWN);
+
+ } catch (const isc::process::DaemonPIDExists& ex) {
+ // First, we print the error on stderr (that should always work)
+ cerr << DHCP6_NAME << " already running? " << ex.what()
+ << endl;
+
+ // Let's also try to log it using logging system, but we're not
+ // sure if it's usable (the exception may have been thrown from
+ // the logger subsystem)
+ try {
+ LOG_FATAL(dhcp6_logger, DHCP6_ALREADY_RUNNING)
+ .arg(DHCP6_NAME).arg(ex.what());
+ } catch (...) {
+ // Already logged so ignore
+ }
+ ret = EXIT_FAILURE;
+ } catch (const std::exception& ex) {
+ // First, we print the error on stderr (that should always work)
+ cerr << DHCP6_NAME << ": Fatal error during start up: " << ex.what()
+ << endl;
+
+ // Let's also try to log it using logging system, but we're not
+ // sure if it's usable (the exception may have been thrown from
+ // the logger subsystem)
+ try {
+ LOG_FATAL(dhcp6_logger, DHCP6_SERVER_FAILED).arg(ex.what());
+ } catch (...) {
+ // Already logged so ignore
+ }
+ ret = EXIT_FAILURE;
+ } catch (...) {
+ cerr << DHCP6_NAME << ": Fatal error during start up"
+ << endl;
+ ret = EXIT_FAILURE;
+ }
+
+ return (ret);
+}
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