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// Copyright (C) 2009 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#include <config.h>
#include <resolver/spec_config.h>
#include <resolver/resolver.h>
#include "resolver_log.h"
#include "common.h"
#include <asiodns/asiodns.h>
#include <asiolink/asiolink.h>
#include <exceptions/exceptions.h>
#include <util/buffer.h>
#include <dns/rcode.h>
#include <dns/message.h>
#include <dns/messagerenderer.h>
#include <cc/session.h>
#include <cc/data.h>
#include <config/ccsession.h>
#include <server_common/socket_request.h>
#include <xfr/xfrout_client.h>
#include <auth/common.h>
#include <cache/resolver_cache.h>
#include <nsas/nameserver_address_store.h>
#include <log/logger_support.h>
#include <log/logger_level.h>
#include "resolver_log.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string>
#include <iostream>
#include <boost/foreach.hpp>
using namespace std;
using namespace isc::cc;
using namespace isc::config;
using namespace isc::data;
using namespace isc::asiodns;
using namespace isc::asiolink;
namespace {
static const string PROGRAM = "Resolver";
IOService io_service;
static boost::shared_ptr<Resolver> resolver;
ConstElementPtr
my_config_handler(ConstElementPtr new_config) {
return (resolver->updateConfig(new_config));
}
ConstElementPtr
my_command_handler(const string& command, ConstElementPtr args) {
ConstElementPtr answer = createAnswer();
try {
if (command == "print_message") {
LOG_INFO(resolver_logger, RESOLVER_PRINT_COMMAND).arg(args);
/* let's add that message to our answer as well */
answer = createAnswer(0, args);
} else if (command == "shutdown") {
// Is the pid argument provided?
if (args && args->contains("pid")) {
// If it is, we check it is the same as our PID
const int pid(args->get("pid")->intValue());
const pid_t my_pid(getpid());
if (my_pid != pid) {
// It is not for us (this is expected, see auth/command.cc
// and the ShutdownCommand there).
return (answer);
}
}
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT,
RESOLVER_SHUTDOWN_RECEIVED);
io_service.stop();
}
return (answer);
} catch (const std::exception& e) {
return (createAnswer(1, e.what()));
}
}
void
usage() {
cerr << "Usage: b10-resolver [-u user] [-v]" << endl;
cerr << "\t-v: verbose output" << endl;
exit(1);
}
} // end of anonymous namespace
int
main(int argc, char* argv[]) {
bool verbose = false;
int ch;
while ((ch = getopt(argc, argv, "u:v")) != -1) {
switch (ch) {
case 'v':
verbose = true;
break;
case '?':
default:
usage();
}
}
if (argc - optind > 0) {
usage();
}
// Until proper logging comes along, initialize the logging with the
// temporary initLogger() code. If verbose, we'll use maximum verbosity.
isc::log::initLogger(RESOLVER_NAME,
(verbose ? isc::log::DEBUG : isc::log::INFO),
isc::log::MAX_DEBUG_LEVEL, NULL, true);
// Print the starting message
string cmdline = argv[0];
for (int i = 1; i < argc; ++ i) {
cmdline = cmdline + " " + argv[i];
}
LOG_INFO(resolver_logger, RESOLVER_STARTING).arg(cmdline);
int ret = 0;
Session* cc_session = NULL;
ModuleCCSession* config_session = NULL;
try {
string specfile;
if (getenv("B10_FROM_BUILD")) {
specfile = string(getenv("B10_FROM_BUILD")) +
"/src/bin/resolver/resolver.spec";
} else {
specfile = string(RESOLVER_SPECFILE_LOCATION);
}
resolver = boost::shared_ptr<Resolver>(new Resolver());
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_CREATED);
DNSLookup* lookup = resolver->getDNSLookupProvider();
DNSAnswer* answer = resolver->getDNSAnswerProvider();
isc::nsas::NameserverAddressStore nsas(resolver);
resolver->setNameserverAddressStore(nsas);
isc::cache::ResolverCache cache;
resolver->setCache(cache);
// TODO priming query, remove root from direct
// Fake a priming query result here (TODO2 how to flag non-expiry?)
// propagation to runningquery. And check for forwarder mode?
isc::dns::QuestionPtr root_question(new isc::dns::Question(
isc::dns::Name("."),
isc::dns::RRClass::IN(),
isc::dns::RRType::NS()));
isc::dns::RRsetPtr root_ns_rrset(new isc::dns::RRset(isc::dns::Name("."),
isc::dns::RRClass::IN(),
isc::dns::RRType::NS(),
isc::dns::RRTTL(8888)));
root_ns_rrset->addRdata(isc::dns::rdata::createRdata(isc::dns::RRType::NS(),
isc::dns::RRClass::IN(),
"l.root-servers.net."));
isc::dns::RRsetPtr root_a_rrset(new isc::dns::RRset(isc::dns::Name("l.root-servers.net"),
isc::dns::RRClass::IN(),
isc::dns::RRType::A(),
isc::dns::RRTTL(8888)));
root_a_rrset->addRdata(isc::dns::rdata::createRdata(isc::dns::RRType::A(),
isc::dns::RRClass::IN(),
"199.7.83.42"));
isc::dns::RRsetPtr root_aaaa_rrset(new isc::dns::RRset(isc::dns::Name("l.root-servers.net"),
isc::dns::RRClass::IN(),
isc::dns::RRType::AAAA(),
isc::dns::RRTTL(8888)));
root_aaaa_rrset->addRdata(isc::dns::rdata::createRdata(isc::dns::RRType::AAAA(),
isc::dns::RRClass::IN(),
"2001:500:3::42"));
isc::dns::MessagePtr priming_result(new isc::dns::Message(isc::dns::Message::RENDER));
priming_result->setRcode(isc::dns::Rcode::NOERROR());
priming_result->addQuestion(root_question);
priming_result->addRRset(isc::dns::Message::SECTION_ANSWER, root_ns_rrset);
priming_result->addRRset(isc::dns::Message::SECTION_ADDITIONAL, root_a_rrset);
priming_result->addRRset(isc::dns::Message::SECTION_ADDITIONAL, root_aaaa_rrset);
cache.update(*priming_result);
cache.update(root_ns_rrset);
cache.update(root_a_rrset);
cache.update(root_aaaa_rrset);
DNSService dns_service(io_service, lookup, answer);
resolver->setDNSService(dns_service);
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_SERVICE_CREATED);
cc_session = new Session(io_service.get_io_service());
isc::server_common::initSocketRequestor(*cc_session, RESOLVER_NAME);
// We delay starting listening to new commands/config just before we
// go into the main loop. See auth/main.cc for the rationale.
config_session = new ModuleCCSession(specfile, *cc_session,
my_config_handler,
my_command_handler, false);
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_CONFIG_CHANNEL);
resolver->setConfigSession(config_session);
// Install all initial configurations. If loading configuration
// fails, it will be logged, but we start the server anyway, giving
// the user a second chance to correct the configuration.
// By setting the 'startup' parameter to true, we ensure most of
// the default configuration will be installed even if listen_on
// fails.
resolver->updateConfig(config_session->getFullConfig(), true);
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_CONFIG_LOADED);
// Now start asynchronous read.
config_session->start();
LOG_INFO(resolver_logger, RESOLVER_STARTED);
io_service.run();
} catch (const std::exception& ex) {
LOG_FATAL(resolver_logger, RESOLVER_FAILED).arg(ex.what());
ret = 1;
}
delete config_session;
delete cc_session;
LOG_INFO(resolver_logger, RESOLVER_SHUTDOWN);
return (ret);
}
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