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// Copyright (C) 2011-2012, 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 <dhcp4/ctrl_dhcp4_srv.h>
#include <dhcp4/dhcp4_log.h>
#include <dhcpsrv/cfgmgr.h>
#include <log/logger_support.h>
#include <log/logger_manager.h>
#include <cfgrpt/config_report.h>
#include <boost/lexical_cast.hpp>
#include <iostream>
using namespace isc::dhcp;
using namespace std;
/// This file contains entry point (main() function) for standard DHCPv4 server
/// component of Kea software suite. It parses command-line arguments and
/// instantiates ControlledDhcpv4Srv class that is responsible for establishing
/// connection with msgq (receiving commands and configuration) and also
/// creating Dhcpv4 server object as well.
namespace {
const char* const DHCP4_NAME = "kea-dhcp4";
/// @brief Prints Kea Usage and exits
///
/// Note: This function never returns. It terminates the process.
void
usage() {
cerr << "Kea DHCPv4 server, version " << VERSION << endl;
cerr << endl;
cerr << "Usage: " << DHCP4_NAME
<< " -[v|V|W] [-d] [-c cfgfile] [-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 << " -p number: specify non-standard port number 1-65535 "
<< "(useful for testing only)" << endl;
exit(EXIT_FAILURE);
}
} // end of anonymous namespace
int
main(int argc, char* argv[]) {
int ch;
int port_number = DHCP4_SERVER_PORT; // The default. any other values are
// useful for testing only.
bool verbose_mode = false; // Should server be verbose?
// The standard config file
std::string config_file("");
while ((ch = getopt(argc, argv, "dvVWc:p:")) != -1) {
switch (ch) {
case 'd':
verbose_mode = true;
break;
case 'v':
cout << Dhcpv4Srv::getVersion(false) << endl;
return (EXIT_SUCCESS);
case 'V':
cout << Dhcpv4Srv::getVersion(true) << endl;
return (EXIT_SUCCESS);
case 'W':
cout << isc::detail::getConfigReport() << endl;
return (EXIT_SUCCESS);
case 'c': // config file
config_file = optarg;
break;
case 'p':
try {
port_number = boost::lexical_cast<int>(optarg);
} catch (const boost::bad_lexical_cast &) {
cerr << "Failed to parse port number: [" << optarg
<< "], 1-65535 allowed." << endl;
usage();
}
if (port_number <= 0 || port_number > 65535) {
cerr << "Failed to parse 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();
}
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.
CfgMgr::instance().setDefaultLoggerName(DHCP4_ROOT_LOGGER_NAME);
// Initialize logging. If verbose, we'll use maximum verbosity.
Daemon::loggerInit(DHCP4_ROOT_LOGGER_NAME, verbose_mode);
LOG_DEBUG(dhcp4_logger, DBG_DHCP4_START, DHCP4_START_INFO)
.arg(getpid()).arg(port_number).arg(verbose_mode ? "yes" : "no");
LOG_INFO(dhcp4_logger, DHCP4_STARTING).arg(VERSION);
// Create the server instance.
ControlledDhcpv4Srv server(port_number);
// Remember verbose-mode
server.setVerbose(verbose_mode);
// Create our PID file.
server.setProcName(DHCP4_NAME);
server.setConfigFile(config_file);
server.createPIDFile();
try {
// Initialize the server.
server.init(config_file);
} catch (const std::exception& ex) {
try {
// Let's log out what went wrong.
isc::log::LoggerManager log_manager;
log_manager.process();
LOG_ERROR(dhcp4_logger, DHCP4_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(dhcp4_logger, DHCP4_STARTED).arg(VERSION);
// And run the main loop of the server.
server.run();
LOG_INFO(dhcp4_logger, DHCP4_SHUTDOWN);
} catch (const isc::dhcp::DaemonPIDExists& ex) {
// First, we print the error on stderr (that should always work)
cerr << DHCP4_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)
LOG_FATAL(dhcp4_logger, DHCP4_ALREADY_RUNNING)
.arg(DHCP4_NAME).arg(ex.what());
ret = EXIT_FAILURE;
} catch (const std::exception& ex) {
// First, we print the error on stderr (that should always work)
cerr << DHCP4_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)
LOG_FATAL(dhcp4_logger, DHCP4_SERVER_FAILED).arg(ex.what());
ret = EXIT_FAILURE;
}
return (ret);
}
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