mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
314 lines
9.6 KiB
C++
314 lines
9.6 KiB
C++
/*
|
|
* 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 "../version.h"
|
|
|
|
#include "Constants.hpp"
|
|
#include "Peer.hpp"
|
|
#include "Node.hpp"
|
|
#include "Switch.hpp"
|
|
#include "Network.hpp"
|
|
#include "AntiRecursion.hpp"
|
|
|
|
#include <algorithm>
|
|
|
|
namespace ZeroTier {
|
|
|
|
Peer::Peer(const Identity &myIdentity,const Identity &peerIdentity)
|
|
throw(std::runtime_error) :
|
|
_lastUsed(0),
|
|
_lastReceive(0),
|
|
_lastUnicastFrame(0),
|
|
_lastMulticastFrame(0),
|
|
_lastAnnouncedTo(0),
|
|
_lastPathConfirmationSent(0),
|
|
_vMajor(0),
|
|
_vMinor(0),
|
|
_vRevision(0),
|
|
_id(peerIdentity),
|
|
_numPaths(0),
|
|
_latency(0)
|
|
{
|
|
if (!myIdentity.agree(peerIdentity,_key,ZT_PEER_SECRET_KEY_LENGTH))
|
|
throw std::runtime_error("new peer identity key agreement failed");
|
|
}
|
|
|
|
void Peer::received(
|
|
const RuntimeEnvironment *RR,
|
|
const InetAddress &remoteAddr,
|
|
int linkDesperation,
|
|
unsigned int hops,
|
|
uint64_t packetId,
|
|
Packet::Verb verb,
|
|
uint64_t inRePacketId,
|
|
Packet::Verb inReVerb)
|
|
{
|
|
const uint64_t now = RR->node->now();
|
|
_lastReceive = now;
|
|
|
|
if (!hops) {
|
|
bool pathIsConfirmed = false;
|
|
|
|
/* Learn new paths from direct (hops == 0) packets */
|
|
{
|
|
unsigned int np = _numPaths;
|
|
for(unsigned int p=0;p<np;++p) {
|
|
if (_paths[p].address() == remoteAddr) {
|
|
_paths[p].received(now,linkDesperation);
|
|
pathIsConfirmed = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!pathIsConfirmed) {
|
|
if ((verb == Packet::VERB_OK)&&(inReVerb == Packet::VERB_HELLO)) {
|
|
// Learn paths if they've been confirmed via a HELLO
|
|
Path *slot = (Path *)0;
|
|
if (np < ZT1_MAX_PEER_NETWORK_PATHS) {
|
|
// Add new path
|
|
slot = &(_paths[np++]);
|
|
} else {
|
|
// Replace oldest non-fixed path
|
|
uint64_t slotLRmin = 0xffffffffffffffffULL;
|
|
for(unsigned int p=0;p<ZT1_MAX_PEER_NETWORK_PATHS;++p) {
|
|
if ((!_paths[p].fixed())&&(_paths[p].lastReceived() <= slotLRmin)) {
|
|
slotLRmin = _paths[p].lastReceived();
|
|
slot = &(_paths[p]);
|
|
}
|
|
}
|
|
}
|
|
if (slot) {
|
|
slot->init(remoteAddr,false);
|
|
slot->received(now,linkDesperation);
|
|
_numPaths = np;
|
|
pathIsConfirmed = true;
|
|
}
|
|
} else {
|
|
/* If this path is not known, send a HELLO. We don't learn
|
|
* paths without confirming that a bidirectional link is in
|
|
* fact present, but any packet that decodes and authenticates
|
|
* correctly is considered valid. */
|
|
if ((now - _lastPathConfirmationSent) >= ZT_MIN_PATH_CONFIRMATION_INTERVAL) {
|
|
_lastPathConfirmationSent = now;
|
|
TRACE("got %s via unknown path %s(%s), confirming...",Packet::verbString(verb),_id.address().toString().c_str(),remoteAddr.toString().c_str());
|
|
attemptToContactAt(RR,remoteAddr,linkDesperation,now);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Announce multicast groups of interest to direct peers if they are
|
|
* considered authorized members of a given network. Also announce to
|
|
* supernodes and network controllers. */
|
|
if ((pathIsConfirmed)&&((now - _lastAnnouncedTo) >= ((ZT_MULTICAST_LIKE_EXPIRE / 2) - 1000))) {
|
|
_lastAnnouncedTo = now;
|
|
|
|
const bool isSupernode = RR->topology->isSupernode(_id.address());
|
|
|
|
Packet outp(_id.address(),RR->identity.address(),Packet::VERB_MULTICAST_LIKE);
|
|
const std::vector< SharedPtr<Network> > networks(RR->node->allNetworks());
|
|
for(std::vector< SharedPtr<Network> >::const_iterator n(networks.begin());n!=networks.end();++n) {
|
|
if ( (isSupernode) || ((*n)->isAllowed(_id.address())) ) {
|
|
const std::vector<MulticastGroup> mgs((*n)->allMulticastGroups());
|
|
for(std::vector<MulticastGroup>::const_iterator mg(mgs.begin());mg!=mgs.end();++mg) {
|
|
if ((outp.size() + 18) > ZT_UDP_DEFAULT_PAYLOAD_MTU) {
|
|
outp.armor(_key,true);
|
|
RR->node->putPacket(remoteAddr,outp.data(),outp.size(),linkDesperation);
|
|
outp.reset(_id.address(),RR->identity.address(),Packet::VERB_MULTICAST_LIKE);
|
|
}
|
|
|
|
// network ID, MAC, ADI
|
|
outp.append((uint64_t)(*n)->id());
|
|
mg->mac().appendTo(outp);
|
|
outp.append((uint32_t)mg->adi());
|
|
}
|
|
}
|
|
}
|
|
if (outp.size() > ZT_PROTO_MIN_PACKET_LENGTH) {
|
|
outp.armor(_key,true);
|
|
RR->node->putPacket(remoteAddr,outp.data(),outp.size(),linkDesperation);
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((verb == Packet::VERB_FRAME)||(verb == Packet::VERB_EXT_FRAME))
|
|
_lastUnicastFrame = now;
|
|
else if (verb == Packet::VERB_MULTICAST_FRAME)
|
|
_lastMulticastFrame = now;
|
|
}
|
|
|
|
void Peer::attemptToContactAt(const RuntimeEnvironment *RR,const InetAddress &atAddress,unsigned int linkDesperation,uint64_t now)
|
|
{
|
|
Packet outp(_id.address(),RR->identity.address(),Packet::VERB_HELLO);
|
|
outp.append((unsigned char)ZT_PROTO_VERSION);
|
|
outp.append((unsigned char)ZEROTIER_ONE_VERSION_MAJOR);
|
|
outp.append((unsigned char)ZEROTIER_ONE_VERSION_MINOR);
|
|
outp.append((uint16_t)ZEROTIER_ONE_VERSION_REVISION);
|
|
outp.append(now);
|
|
|
|
RR->identity.serialize(outp,false);
|
|
|
|
switch(atAddress.ss_family) {
|
|
case AF_INET:
|
|
outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_IPV4);
|
|
outp.append(atAddress.rawIpData(),4);
|
|
outp.append((uint16_t)atAddress.port());
|
|
break;
|
|
case AF_INET6:
|
|
outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_IPV6);
|
|
outp.append(atAddress.rawIpData(),16);
|
|
outp.append((uint16_t)atAddress.port());
|
|
break;
|
|
default:
|
|
outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_NONE);
|
|
break;
|
|
}
|
|
|
|
outp.armor(_key,false); // HELLO is sent in the clear
|
|
RR->node->putPacket(atAddress,outp.data(),outp.size(),linkDesperation);
|
|
}
|
|
|
|
void Peer::doPingAndKeepalive(const RuntimeEnvironment *RR,uint64_t now)
|
|
{
|
|
Path *const bestPath = getBestPath(now);
|
|
if ((bestPath)&&(bestPath->active(now))) {
|
|
const unsigned int desp = std::max(RR->node->coreDesperation(),bestPath->lastReceiveDesperation());
|
|
if ((now - bestPath->lastReceived()) >= ZT_PEER_DIRECT_PING_DELAY) {
|
|
TRACE("PING %s(%s) desperation == %u",_id.address().toString().c_str(),bestPath->address().toString().c_str(),desp);
|
|
attemptToContactAt(RR,bestPath->address(),desp,now);
|
|
bestPath->sent(now);
|
|
} else if ((now - bestPath->lastSend()) >= ZT_NAT_KEEPALIVE_DELAY) {
|
|
// We only do keepalive if desperation is zero right now, since higher
|
|
// desperation paths involve things like tunneling that do not need it.
|
|
if (desp == 0) {
|
|
TRACE("NAT keepalive %s(%s)",_id.address().toString().c_str(),bestPath->address().toString().c_str());
|
|
RR->node->putPacket(bestPath->address(),"",0,0);
|
|
bestPath->sent(now);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Peer::addPath(const Path &newp)
|
|
{
|
|
unsigned int np = _numPaths;
|
|
|
|
for(unsigned int p=0;p<np;++p) {
|
|
if (_paths[p].address() == newp.address()) {
|
|
_paths[p].setFixed(newp.fixed());
|
|
return;
|
|
}
|
|
}
|
|
|
|
Path *slot = (Path *)0;
|
|
if (np < ZT1_MAX_PEER_NETWORK_PATHS) {
|
|
// Add new path
|
|
slot = &(_paths[np++]);
|
|
} else {
|
|
// Replace oldest non-fixed path
|
|
uint64_t slotLRmin = 0xffffffffffffffffULL;
|
|
for(unsigned int p=0;p<ZT1_MAX_PEER_NETWORK_PATHS;++p) {
|
|
if ((!_paths[p].fixed())&&(_paths[p].lastReceived() <= slotLRmin)) {
|
|
slotLRmin = _paths[p].lastReceived();
|
|
slot = &(_paths[p]);
|
|
}
|
|
}
|
|
}
|
|
if (slot) {
|
|
*slot = newp;
|
|
_numPaths = np;
|
|
}
|
|
}
|
|
|
|
void Peer::clearPaths(bool fixedToo)
|
|
{
|
|
if (fixedToo) {
|
|
_numPaths = 0;
|
|
} else {
|
|
unsigned int np = _numPaths;
|
|
unsigned int x = 0;
|
|
unsigned int y = 0;
|
|
while (x < np) {
|
|
if (_paths[x].fixed())
|
|
_paths[y++] = _paths[x];
|
|
++x;
|
|
}
|
|
_numPaths = y;
|
|
}
|
|
}
|
|
|
|
void Peer::resetWithinScope(const RuntimeEnvironment *RR,InetAddress::IpScope scope,uint64_t now)
|
|
{
|
|
unsigned int np = _numPaths;
|
|
unsigned int x = 0;
|
|
unsigned int y = 0;
|
|
while (x < np) {
|
|
if (_paths[x].address().ipScope() == scope) {
|
|
if (_paths[x].fixed()) {
|
|
attemptToContactAt(RR,_paths[x].address(),_paths[x].lastReceiveDesperation(),now);
|
|
_paths[y++] = _paths[x]; // keep fixed paths
|
|
}
|
|
} else {
|
|
_paths[y++] = _paths[x]; // keep paths not in this scope
|
|
}
|
|
++x;
|
|
}
|
|
_numPaths = y;
|
|
|
|
if ((y < np)&&(alive(now))) {
|
|
// Try to re-establish direct connectivity to this peer if it's alive
|
|
// and we have forgotten paths to it.
|
|
Packet outp(_id.address(),RR->identity.address(),Packet::VERB_NOP);
|
|
RR->sw->send(outp,true);
|
|
}
|
|
}
|
|
|
|
void Peer::getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6,unsigned int maxDesperation) const
|
|
{
|
|
uint64_t bestV4 = 0,bestV6 = 0;
|
|
for(unsigned int p=0,np=_numPaths;p<np;++p) {
|
|
if ((_paths[p].active(now))&&(_paths[p].lastReceiveDesperation() <= maxDesperation)) {
|
|
uint64_t lr = _paths[p].lastReceived();
|
|
if (lr) {
|
|
if (_paths[p].address().isV4()) {
|
|
if (lr >= bestV4) {
|
|
bestV4 = lr;
|
|
v4 = _paths[p].address();
|
|
}
|
|
} else if (_paths[p].address().isV6()) {
|
|
if (lr >= bestV6) {
|
|
bestV6 = lr;
|
|
v6 = _paths[p].address();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace ZeroTier
|