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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2015 ZeroTier, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Constants.hpp"
#include "SelfAwareness.hpp"
#include "RuntimeEnvironment.hpp"
#include "Node.hpp"
#include "Topology.hpp"
#include "Packet.hpp"
#include "Peer.hpp"
// Entry timeout -- make it fairly long since this is just to prevent stale buildup
#define ZT_SELFAWARENESS_ENTRY_TIMEOUT 3600000
namespace ZeroTier {
class _ResetWithinScope
{
public:
_ResetWithinScope(const RuntimeEnvironment *renv,uint64_t now,InetAddress::IpScope scope) :
RR(renv),
_now(now),
_scope(scope) {}
inline void operator()(Topology &t,const SharedPtr<Peer> &p)
{
if (p->resetWithinScope(RR,_scope,_now))
peersReset.push_back(p);
}
std::vector< SharedPtr<Peer> > peersReset;
private:
const RuntimeEnvironment *RR;
uint64_t _now;
InetAddress::IpScope _scope;
};
SelfAwareness::SelfAwareness(const RuntimeEnvironment *renv) :
RR(renv)
{
}
SelfAwareness::~SelfAwareness()
{
}
void SelfAwareness::iam(const Address &reporter,const InetAddress &reporterPhysicalAddress,const InetAddress &myPhysicalAddress,bool trusted,uint64_t now)
{
const InetAddress::IpScope scope = myPhysicalAddress.ipScope();
switch(scope) {
case InetAddress::IP_SCOPE_NONE:
case InetAddress::IP_SCOPE_LOOPBACK:
case InetAddress::IP_SCOPE_MULTICAST:
return;
case InetAddress::IP_SCOPE_GLOBAL:
if ((!trusted)||(scope != reporterPhysicalAddress.ipScope()))
return;
break;
default:
if (scope != reporterPhysicalAddress.ipScope())
return;
break;
}
Mutex::Lock _l(_phy_m);
PhySurfaceEntry &entry = _phy[PhySurfaceKey(reporter,scope)];
if ((now - entry.ts) >= ZT_SELFAWARENESS_ENTRY_TIMEOUT) {
entry.mySurface = myPhysicalAddress;
entry.ts = now;
TRACE("learned physical address %s for scope %u as seen from %s(%s) (replaced <null>)",myPhysicalAddress.toString().c_str(),(unsigned int)scope,reporter.toString().c_str(),reporterPhysicalAddress.toString().c_str());
} else if (entry.mySurface != myPhysicalAddress) {
entry.mySurface = myPhysicalAddress;
entry.ts = now;
TRACE("learned physical address %s for scope %u as seen from %s(%s) (replaced %s, resetting all in scope)",myPhysicalAddress.toString().c_str(),(unsigned int)scope,reporter.toString().c_str(),reporterPhysicalAddress.toString().c_str(),entry.mySurface.toString().c_str());
_ResetWithinScope rset(RR,now,(InetAddress::IpScope)scope);
RR->topology->eachPeer<_ResetWithinScope &>(rset);
// For all peers for whom we forgot an address, send a packet indirectly if
// they are still considered alive so that we will re-establish direct links.
SharedPtr<Peer> sn(RR->topology->getBestSupernode());
if (sn) {
Path *snp = sn->getBestPath(now);
if (snp) {
for(std::vector< SharedPtr<Peer> >::const_iterator p(rset.peersReset.begin());p!=rset.peersReset.end();++p) {
if ((*p)->alive(now)) {
TRACE("sending indirect NOP to %s via %s(%s) to re-establish link",(*p)->address().toString().c_str(),sn->address().toString().c_str(),snp->address().toString().c_str());
Packet outp((*p)->address(),RR->identity.address(),Packet::VERB_NOP);
outp.armor((*p)->key(),true);
snp->send(RR,outp.data(),outp.size(),now);
}
}
}
}
}
}
void SelfAwareness::clean(uint64_t now)
{
Mutex::Lock _l(_phy_m);
for(std::map< PhySurfaceKey,PhySurfaceEntry >::iterator p(_phy.begin());p!=_phy.end();) {
if ((now - p->second.ts) >= ZT_SELFAWARENESS_ENTRY_TIMEOUT)
_phy.erase(p++);
else ++p;
}
}
} // namespace ZeroTier
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