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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 <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 <string>
#include <iostream>
#include <boost/foreach.hpp>
#include <asiolink/asiolink.h>
#include <exceptions/exceptions.h>
#include <util/io/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 <xfr/xfrout_client.h>
#include <auth/change_user.h>
#include <auth/common.h>
#include <resolver/spec_config.h>
#include <resolver/resolver.h>
#include <cache/resolver_cache.h>
#include <nsas/nameserver_address_store.h>
#include <log/dummylog.h>
using namespace std;
using namespace isc::cc;
using namespace isc::config;
using namespace isc::data;
using isc::log::dlog;
using namespace 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();
if (command == "print_message") {
cout << args << endl;
/* let's add that message to our answer as well */
answer = createAnswer(0, args);
} else if (command == "shutdown") {
io_service.stop();
}
return (answer);
}
void
usage() {
cerr << "Usage: b10-resolver [-u user] [-v]" << endl;
cerr << "\t-u: change process UID to the specified user" << endl;
cerr << "\t-v: verbose output" << endl;
exit(1);
}
} // end of anonymous namespace
int
main(int argc, char* argv[]) {
isc::log::dprefix = "b10-resolver";
int ch;
const char* uid = NULL;
while ((ch = getopt(argc, argv, "u:v")) != -1) {
switch (ch) {
case 'u':
uid = optarg;
break;
case 'v':
isc::log::denabled = true;
break;
case '?':
default:
usage();
}
}
if (argc - optind > 0) {
usage();
}
if (isc::log::denabled) { // Show the command line
string cmdline("Command line:");
for (int i = 0; i < argc; ++ i) {
cmdline = cmdline + " " + argv[i];
}
dlog(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());
dlog("Server created.");
SimpleCallback* checkin = resolver->getCheckinProvider();
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, checkin, lookup, answer);
resolver->setDNSService(dns_service);
dlog("IOService created.");
cc_session = new Session(io_service.get_io_service());
dlog("Configuration session channel created.");
config_session = new ModuleCCSession(specfile, *cc_session,
my_config_handler,
my_command_handler);
dlog("Configuration channel established.");
// FIXME: This does not belong here, but inside Boss
if (uid != NULL) {
changeUser(uid);
}
resolver->setConfigSession(config_session);
dlog("Config loaded");
dlog("Server started.");
io_service.run();
} catch (const std::exception& ex) {
dlog(string("Server failed: ") + ex.what(),true);
ret = 1;
}
delete config_session;
delete cc_session;
return (ret);
}
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