mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-22 06:17:48 +00:00
338 lines
12 KiB
C++
338 lines
12 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#include "Topology.hpp"
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#include "NodeConfig.hpp"
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namespace ZeroTier {
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#define ZT_KISSDB_HASH_TABLE_SIZE 131072
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#define ZT_KISSDB_KEY_SIZE ZT_ADDRESS_LENGTH
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#define ZT_KISSDB_VALUE_SIZE ZT_PEER_MAX_SERIALIZED_LENGTH
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Topology::Topology(const RuntimeEnvironment *renv,const char *dbpath)
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throw(std::runtime_error) :
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Thread(),
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_r(renv)
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{
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if (KISSDB_open(&_dbm,dbpath,KISSDB_OPEN_MODE_RWCREAT,ZT_KISSDB_HASH_TABLE_SIZE,ZT_KISSDB_KEY_SIZE,ZT_KISSDB_VALUE_SIZE)) {
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if (KISSDB_open(&_dbm,dbpath,KISSDB_OPEN_MODE_RWREPLACE,ZT_KISSDB_HASH_TABLE_SIZE,ZT_KISSDB_KEY_SIZE,ZT_KISSDB_VALUE_SIZE))
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throw std::runtime_error("unable to open peer database (rw/create)");
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}
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if ((_dbm.key_size != ZT_KISSDB_KEY_SIZE)||(_dbm.value_size != ZT_KISSDB_VALUE_SIZE)||(_dbm.hash_table_size != ZT_KISSDB_HASH_TABLE_SIZE)) {
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KISSDB_close(&_dbm);
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if (KISSDB_open(&_dbm,dbpath,KISSDB_OPEN_MODE_RWREPLACE,ZT_KISSDB_HASH_TABLE_SIZE,ZT_KISSDB_KEY_SIZE,ZT_KISSDB_VALUE_SIZE))
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throw std::runtime_error("unable to open peer database (recreate)");
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}
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Utils::lockDownFile(dbpath,false); // node.db caches secrets
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start();
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}
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Topology::~Topology()
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{
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{
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Mutex::Lock _l(_peerDeepVerifyJobs_m);
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_peerDeepVerifyJobs.push_back(_PeerDeepVerifyJob());
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_peerDeepVerifyJobs.back().type = _PeerDeepVerifyJob::CLEAN_CACHE;
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_peerDeepVerifyJobs.push_back(_PeerDeepVerifyJob());
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_peerDeepVerifyJobs.back().type = _PeerDeepVerifyJob::EXIT_THREAD;
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}
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_peerDeepVerifyJobs_c.signal();
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while (running())
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Thread::sleep(10); // wait for thread to terminate without join()
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KISSDB_close(&_dbm);
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}
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void Topology::setSupernodes(const std::map< Identity,std::vector<InetAddress> > &sn)
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{
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Mutex::Lock _l(_supernodes_m);
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_supernodes = sn;
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_supernodeAddresses.clear();
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_supernodePeers.clear();
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for(std::map< Identity,std::vector<InetAddress> >::const_iterator i(sn.begin());i!=sn.end();++i) {
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if (i->first != _r->identity) {
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SharedPtr<Peer> p(getPeer(i->first.address()));
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if ((!p)||(p->identity() != i->first)) {
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p = SharedPtr<Peer>(new Peer(_r->identity,i->first));
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_reallyAddPeer(p);
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}
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for(std::vector<InetAddress>::const_iterator j(i->second.begin());j!=i->second.end();++j)
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p->setPathAddress(*j,true);
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_supernodePeers.push_back(p);
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}
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_supernodeAddresses.insert(i->first.address());
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}
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}
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void Topology::addPeer(const SharedPtr<Peer> &candidate,void (*callback)(void *,const SharedPtr<Peer> &,Topology::PeerVerifyResult),void *arg)
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{
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if (candidate->address() != _r->identity.address()) {
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Mutex::Lock _l(_peerDeepVerifyJobs_m);
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_peerDeepVerifyJobs.push_back(_PeerDeepVerifyJob());
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_PeerDeepVerifyJob &job = _peerDeepVerifyJobs.back();
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job.callback = callback;
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job.arg = arg;
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job.candidate = candidate;
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job.type = _PeerDeepVerifyJob::VERIFY_PEER;
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_peerDeepVerifyJobs_c.signal();
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} else {
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TRACE("BUG: addPeer() caught and ignored attempt to add peer for self");
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if (callback)
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callback(arg,candidate,PEER_VERIFY_REJECTED_DUPLICATE_TRIAGED);
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}
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}
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SharedPtr<Peer> Topology::getPeer(const Address &zta)
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{
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if (zta == _r->identity.address()) {
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TRACE("BUG: ignored attempt to getPeer() for self, returned NULL");
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return SharedPtr<Peer>();
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}
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{
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Mutex::Lock _l(_activePeers_m);
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std::map< Address,SharedPtr<Peer> >::const_iterator ap(_activePeers.find(zta));
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if ((ap != _activePeers.end())&&(ap->second))
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return ap->second;
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}
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Buffer<ZT_KISSDB_VALUE_SIZE> b(ZT_KISSDB_VALUE_SIZE);
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_dbm_m.lock();
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if (!KISSDB_get(&_dbm,zta.data(),b.data())) {
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_dbm_m.unlock();
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SharedPtr<Peer> p(new Peer());
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try {
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p->deserialize(b,0);
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Mutex::Lock _l(_activePeers_m);
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_activePeers[zta] = p;
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return p;
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} catch ( ... ) {
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TRACE("unexpected exception deserializing peer %s from peerdb",zta.toString().c_str());
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return SharedPtr<Peer>();
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}
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} else _dbm_m.unlock();
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return SharedPtr<Peer>();
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}
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SharedPtr<Peer> Topology::getBestSupernode(const Address *avoid,unsigned int avoidCount) const
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{
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SharedPtr<Peer> bestSupernode;
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unsigned long bestSupernodeLatency = 0xffff;
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uint64_t now = Utils::now();
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Mutex::Lock _l(_supernodes_m);
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for(std::vector< SharedPtr<Peer> >::const_iterator sn=_supernodePeers.begin();sn!=_supernodePeers.end();) {
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for(unsigned int i=0;i<avoidCount;++i) {
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if (avoid[i] == (*sn)->address())
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goto skip_and_try_next_supernode;
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}
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if ((*sn)->hasActiveDirectPath(now)) { // only consider those that responded to pings
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unsigned int l = (*sn)->latency();
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if ((l)&&(l <= bestSupernodeLatency)) {
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bestSupernodeLatency = l;
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bestSupernode = *sn;
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}
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}
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skip_and_try_next_supernode:
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++sn;
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}
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if (bestSupernode)
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return bestSupernode;
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for(std::vector< SharedPtr<Peer> >::const_iterator sn=_supernodePeers.begin();sn!=_supernodePeers.end();++sn) {
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if ((*sn)->hasActiveDirectPath(now)) { // only consider those that responded to pings
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unsigned int l = (*sn)->latency();
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if ((l)&&(l <= bestSupernodeLatency)) {
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bestSupernodeLatency = l;
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bestSupernode = *sn;
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}
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}
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}
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if (bestSupernode)
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return bestSupernode;
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uint64_t bestSupernodeLastDirectReceive = 0;
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for(std::vector< SharedPtr<Peer> >::const_iterator sn=_supernodePeers.begin();sn!=_supernodePeers.end();++sn) {
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uint64_t l = (*sn)->lastDirectReceive();
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if (l > bestSupernodeLastDirectReceive) {
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bestSupernodeLastDirectReceive = l;
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bestSupernode = *sn;
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}
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}
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return bestSupernode;
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}
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void Topology::clean()
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{
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{
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Mutex::Lock _l(_peerDeepVerifyJobs_m);
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_peerDeepVerifyJobs.push_back(_PeerDeepVerifyJob());
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_peerDeepVerifyJobs.back().type = _PeerDeepVerifyJob::CLEAN_CACHE;
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}
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_peerDeepVerifyJobs_c.signal();
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}
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void Topology::main()
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throw()
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{
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for(;;) {
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_peerDeepVerifyJobs_m.lock();
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if (_peerDeepVerifyJobs.empty()) {
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_peerDeepVerifyJobs_m.unlock();
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_peerDeepVerifyJobs_c.wait();
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continue;
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}
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_PeerDeepVerifyJob job(_peerDeepVerifyJobs.front());
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_peerDeepVerifyJobs.pop_front();
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unsigned long queueRemaining = _peerDeepVerifyJobs.size();
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_peerDeepVerifyJobs_m.unlock();
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switch(job.type) {
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case _PeerDeepVerifyJob::VERIFY_PEER:
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/* TODO: We should really verify peers every time completely if this
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* is a supernode, perhaps deferring the expensive part for new
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* addresses. An attempt at claim jumping should also trigger a
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* short duration ban of the originating IP address in most cases,
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* since this means either malicious intent or broken software. */
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TRACE("verifying peer: %s",job.candidate->identity().address().toString().c_str());
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if ((job.candidate->identity())&&(!job.candidate->identity().address().isReserved())&&(job.candidate->identity().locallyValidate(false))) {
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// Peer passes sniff test, so check to see if we've already got
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// one with the same address.
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SharedPtr<Peer> existingPeer(getPeer(job.candidate->identity().address()));
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if (existingPeer) {
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if (existingPeer->identity() == job.candidate->identity()) {
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// It's an *exact* duplicate, so return the existing peer
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if (job.callback)
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job.callback(job.arg,existingPeer,PEER_VERIFY_ACCEPTED_ALREADY_HAVE);
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} else if (queueRemaining > 3) {
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/* Prevents a CPU hog DOS attack, while allowing a very unlikely kind of
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* DOS attack where someone knows someone else's address prior to their
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* registering it and claim-jumps them and then floods with bad identities
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* to hold their claim. Of the two, the latter would be infeasable
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* without already having cracked the target's machine in which case
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* the attacker has their private key anyway and can really steal their
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* identity. So why bother.*/
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TRACE("%s is duplicate, load too high, old won",job.candidate->identity().address().toString().c_str());
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if (job.callback)
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job.callback(job.arg,job.candidate,PEER_VERIFY_REJECTED_DUPLICATE_TRIAGED);
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} else {
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// It's different so deeply validate it first, then the
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// existing claimant, and toss the imposter. If both verify, the
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// one we already have wins.
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if (!job.candidate->identity().locallyValidate(true)) {
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LOG("Topology: IMPOSTER %s rejected",job.candidate->identity().address().toString().c_str());
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if (job.callback)
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job.callback(job.arg,job.candidate,PEER_VERIFY_REJECTED_INVALID_IDENTITY);
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} else if (!existingPeer->identity().locallyValidate(true)) {
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LOG("Topology: previous IMPOSTER %s displaced by valid identity!",job.candidate->identity().address().toString().c_str());
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_reallyAddPeer(job.candidate);
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if (job.callback)
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job.callback(job.arg,job.candidate,PEER_VERIFY_ACCEPTED_DISPLACED_INVALID_ADDRESS);
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} else {
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LOG("Topology: tie between apparently valid claims on %s, oldest won",job.candidate->identity().address().toString().c_str());
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if (job.callback)
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job.callback(job.arg,job.candidate,PEER_VERIFY_REJECTED_DUPLICATE);
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}
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}
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} else {
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TRACE("%s accepted as new",job.candidate->identity().address().toString().c_str());
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_reallyAddPeer(job.candidate);
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if (job.callback)
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job.callback(job.arg,job.candidate,PEER_VERIFY_ACCEPTED_NEW);
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}
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} else {
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TRACE("%s rejected, identity failed initial checks",job.candidate->identity().address().toString().c_str());
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if (job.callback)
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job.callback(job.arg,job.candidate,PEER_VERIFY_REJECTED_INVALID_IDENTITY);
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}
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break;
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case _PeerDeepVerifyJob::CLEAN_CACHE:
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TRACE("cleaning caches and flushing modified peers to disk...");
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{
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Mutex::Lock _l(_activePeers_m);
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for(std::map< Address,SharedPtr<Peer> >::iterator p(_activePeers.begin());p!=_activePeers.end();++p) {
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if (p->second->getAndResetDirty()) {
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try {
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Buffer<ZT_PEER_MAX_SERIALIZED_LENGTH> b;
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p->second->serialize(b);
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b.zeroUnused();
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_dbm_m.lock();
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if (KISSDB_put(&_dbm,p->second->identity().address().data(),b.data())) {
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TRACE("error writing %s to peer.db",p->second->identity().address().toString().c_str());
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}
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_dbm_m.unlock();
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} catch ( ... ) {
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TRACE("unexpected exception flushing %s to peer.db",p->second->identity().address().toString().c_str());
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}
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}
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}
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}
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break;
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case _PeerDeepVerifyJob::EXIT_THREAD:
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TRACE("thread terminating...");
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return;
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}
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}
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}
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void Topology::_reallyAddPeer(const SharedPtr<Peer> &p)
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{
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{
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Mutex::Lock _l(_activePeers_m);
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_activePeers[p->identity().address()] = p;
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}
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try {
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Buffer<ZT_PEER_MAX_SERIALIZED_LENGTH> b;
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p->serialize(b);
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b.zeroUnused();
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_dbm_m.lock();
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if (KISSDB_put(&_dbm,p->identity().address().data(),b.data())) {
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TRACE("error writing %s to peerdb",p->address().toString().c_str());
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} else p->getAndResetDirty();
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_dbm_m.unlock();
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} catch ( ... ) {
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TRACE("unexpected exception flushing to peerdb");
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}
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}
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} // namespace ZeroTier
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