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mastercommunicator.cc
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/*
PowerDNS Versatile Database Driven Nameserver
Copyright (C) 2002-2011 PowerDNS.COM BV
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation;
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "packetcache.hh"
#include "utility.hh"
#include <errno.h>
#include "communicator.hh"
#include <set>
#include <boost/utility.hpp>
#include <boost/foreach.hpp>
#include "dnsbackend.hh"
#include "ueberbackend.hh"
#include "packethandler.hh"
#include "nameserver.hh"
#include "resolver.hh"
#include "logger.hh"
#include "dns.hh"
#include "arguments.hh"
#include "session.hh"
#include "packetcache.hh"
#include <boost/lexical_cast.hpp>
#include "namespaces.hh"
void CommunicatorClass::queueNotifyDomain(const string &domain, DNSBackend *B)
{
bool hasQueuedItem=false;
set<string> ips;
FindNS fns;
DNSResourceRecord rr;
set<string> nsset;
B->lookup(QType(QType::NS),domain);
while(B->get(rr))
nsset.insert(rr.content);
for(set<string>::const_iterator j=nsset.begin();j!=nsset.end();++j) {
vector<string> nsips=fns.lookup(*j, B);
if(nsips.empty())
L<<Logger::Warning<<"Unable to queue notification of domain '"<<domain<<"': nameservers do not resolve!"<<endl;
for(vector<string>::const_iterator k=nsips.begin();k!=nsips.end();++k)
ips.insert(*k);
}
// make calls to d_nq.add(domain, ip);
for(set<string>::const_iterator j=ips.begin();j!=ips.end();++j) {
L<<Logger::Warning<<"Queued notification of domain '"<<domain<<"' to "<<*j<<endl;
d_nq.add(domain,*j);
hasQueuedItem=true;
}
set<string>alsoNotify;
B->alsoNotifies(domain, &alsoNotify);
for(set<string>::const_iterator j=alsoNotify.begin();j!=alsoNotify.end();++j) {
L<<Logger::Warning<<"Queued also-notification of domain '"<<domain<<"' to "<<*j<<endl;
d_nq.add(domain,*j);
hasQueuedItem=true;
}
if (!hasQueuedItem)
L<<Logger::Warning<<"Request to queue notification for domain '"<<domain<<"' was processed, but no nameservers or also-notify's found. Not notifying!"<<endl;
}
bool CommunicatorClass::notifyDomain(const string &domain)
{
DomainInfo di;
PacketHandler P;
if(!P.getBackend()->getDomainInfo(domain, di)) {
L<<Logger::Error<<"No such domain '"<<domain<<"' in our database"<<endl;
return false;
}
queueNotifyDomain(domain, P.getBackend());
// call backend and tell them we sent out the notification - even though that is premature
di.backend->setNotified(di.id, di.serial);
return true;
}
void NotificationQueue::dump()
{
cerr<<"Waiting for notification responses: "<<endl;
BOOST_FOREACH(NotificationRequest& nr, d_nqueue) {
cerr<<nr.domain<<", "<<nr.ip<<endl;
}
}
void CommunicatorClass::masterUpdateCheck(PacketHandler *P)
{
if(!::arg().mustDo("master"))
return;
UeberBackend *B=dynamic_cast<UeberBackend *>(P->getBackend());
vector<DomainInfo> cmdomains;
B->getUpdatedMasters(&cmdomains);
if(cmdomains.empty()) {
if(d_masterschanged)
L<<Logger::Warning<<"No master domains need notifications"<<endl;
d_masterschanged=false;
}
else {
d_masterschanged=true;
L<<Logger::Error<<cmdomains.size()<<" domain"<<(cmdomains.size()>1 ? "s" : "")<<" for which we are master need"<<
(cmdomains.size()>1 ? "" : "s")<<
" notifications"<<endl;
}
// figure out A records of everybody needing notification
// do this via the FindNS class, d_fns
for(vector<DomainInfo>::const_iterator i=cmdomains.begin();i!=cmdomains.end();++i) {
extern PacketCache PC;
PC.purge(i->zone); // fixes cvstrac ticket #30
queueNotifyDomain(i->zone,P->getBackend());
i->backend->setNotified(i->id,i->serial);
}
}
time_t CommunicatorClass::doNotifications()
{
ComboAddress from;
Utility::socklen_t fromlen=sizeof(from);
char buffer[1500];
int size, sock;
// receive incoming notifications on the nonblocking socket and take them off the list
while(waitFor2Data(d_nsock4, d_nsock6, 0, 0, &sock) > 0) {
size=recvfrom(sock,buffer,sizeof(buffer),0,(struct sockaddr *)&from,&fromlen);
if(size < 0)
break;
DNSPacket p;
p.setRemote(&from);
if(p.parse(buffer,size)<0) {
L<<Logger::Warning<<"Unable to parse SOA notification answer from "<<p.getRemote()<<endl;
continue;
}
if(p.d.rcode)
L<<Logger::Warning<<"Received unsuccessful notification report for '"<<p.qdomain<<"' from "<<from.toStringWithPort()<<", rcode: "<<p.d.rcode<<endl;
if(d_nq.removeIf(from.toStringWithPort(), p.d.id, p.qdomain))
L<<Logger::Warning<<"Removed from notification list: '"<<p.qdomain<<"' to "<<from.toStringWithPort()<< (p.d.rcode ? "" : " (was acknowledged)")<<endl;
else {
L<<Logger::Warning<<"Received spurious notify answer for '"<<p.qdomain<<"' from "<< from.toStringWithPort()<<endl;
//d_nq.dump();
}
}
// send out possible new notifications
string domain, ip;
uint16_t id;
bool purged;
while(d_nq.getOne(domain, ip, &id, purged)) {
if(!purged) {
try {
ComboAddress remote(ip, 53); // default to 53
if((d_nsock6 < 0 && remote.sin4.sin_family == AF_INET6) ||
(d_nsock4 < 0 && remote.sin4.sin_family == AF_INET))
continue; // don't try to notify what we can't!
if(d_preventSelfNotification && AddressIsUs(remote))
continue;
sendNotification(remote.sin4.sin_family == AF_INET ? d_nsock4 : d_nsock6, domain, remote, id);
drillHole(domain, ip);
}
catch(ResolverException &re) {
L<<Logger::Error<<"Error trying to resolve '"+ip+"' for notifying '"+domain+"' to server: "+re.reason<<endl;
}
}
else
L<<Logger::Error<<Logger::NTLog<<"Notification for "<<domain<<" to "<<ip<<" failed after retries"<<endl;
}
return d_nq.earliest();
}
void CommunicatorClass::sendNotification(int sock, const string& domain, const ComboAddress& remote, uint16_t id)
{
vector<uint8_t> packet;
DNSPacketWriter pw(packet, domain, QType::SOA, 1, Opcode::Notify);
pw.getHeader()->id = id;
pw.getHeader()->aa = true;
if(sendto(sock, &packet[0], packet.size(), 0, (struct sockaddr*)(&remote), remote.getSocklen()) < 0) {
throw ResolverException("Unable to send notify to "+remote.toStringWithPort()+": "+stringerror());
}
}
void CommunicatorClass::drillHole(const string &domain, const string &ip)
{
Lock l(&d_holelock);
d_holes[make_pair(domain,ip)]=time(0);
}
bool CommunicatorClass::justNotified(const string &domain, const string &ip)
{
Lock l(&d_holelock);
if(d_holes.find(make_pair(domain,ip))==d_holes.end()) // no hole
return false;
if(d_holes[make_pair(domain,ip)]>time(0)-900) // recent hole
return true;
// do we want to purge this? XXX FIXME
return false;
}
void CommunicatorClass::makeNotifySockets()
{
d_nsock4 = makeQuerySocket(ComboAddress(::arg()["query-local-address"]), true);
if(!::arg()["query-local-address6"].empty())
d_nsock6 = makeQuerySocket(ComboAddress(::arg()["query-local-address6"]), true);
else
d_nsock6 = -1;
}
void CommunicatorClass::notify(const string &domain, const string &ip)
{
d_nq.add(domain, ip);
d_any_sem.post();
}