mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 14:52:24 +00:00
286 lines
8.9 KiB
C++
286 lines
8.9 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2011-2014 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 "Constants.hpp"
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#include "Peer.hpp"
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#include "Switch.hpp"
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#include "Packet.hpp"
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#include "Network.hpp"
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#include "NodeConfig.hpp"
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#include "AntiRecursion.hpp"
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#include <algorithm>
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namespace ZeroTier {
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Peer::Peer() :
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_lastUsed(0),
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_lastReceive(0),
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_lastUnicastFrame(0),
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_lastMulticastFrame(0),
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__lastAnnouncedTo(0),
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_vMajor(0),
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_vMinor(0),
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_vRevision(0),
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_latency(0) {}
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Peer::Peer(const Identity &myIdentity,const Identity &peerIdentity)
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throw(std::runtime_error) :
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_id(peerIdentity),
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_lastUsed(0),
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_lastReceive(0),
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_lastUnicastFrame(0),
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_lastMulticastFrame(0),
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__lastAnnouncedTo(0),
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_vMajor(0),
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_vMinor(0),
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_vRevision(0),
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_latency(0)
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{
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if (!myIdentity.agree(peerIdentity,_key,ZT_PEER_SECRET_KEY_LENGTH))
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throw std::runtime_error("new peer identity key agreement failed");
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}
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void Peer::receive(
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const RuntimeEnvironment *RR,
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const SharedPtr<Socket> &fromSock,
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const InetAddress &remoteAddr,
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unsigned int hops,
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uint64_t packetId,
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Packet::Verb verb,
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uint64_t inRePacketId,
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Packet::Verb inReVerb,
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uint64_t now)
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{
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// Update system-wide last packet receive time
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*((const_cast<uint64_t *>(&(RR->timeOfLastPacketReceived)))) = now;
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Mutex::Lock _l(_lock);
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// Global last receive time regardless of path
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_lastReceive = now;
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if (!hops) {
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// Learn paths from direct packets (hops == 0)
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{
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bool havePath = false;
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for(std::vector<Path>::iterator p(_paths.begin());p!=_paths.end();++p) {
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if ((p->address() == remoteAddr)&&(p->tcp() == fromSock->tcp())) {
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p->received(now);
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havePath = true;
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break;
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}
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}
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if (!havePath) {
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Path::Type pt = Path::PATH_TYPE_UDP;
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switch(fromSock->type()) {
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case Socket::ZT_SOCKET_TYPE_TCP_IN:
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pt = Path::PATH_TYPE_TCP_IN;
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break;
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case Socket::ZT_SOCKET_TYPE_TCP_OUT:
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pt = Path::PATH_TYPE_TCP_OUT;
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break;
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default:
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break;
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}
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_paths.push_back(Path(remoteAddr,pt,false));
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_paths.back().received(now);
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}
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}
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/* Announce multicast groups of interest to direct peers if they are
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* considered authorized members of a given network. Also announce to
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* supernodes and network controllers. The other place this is done
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* is in rescanMulticastGroups() in Network, but that only sends something
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* if a network's multicast groups change. */
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if ((now - __lastAnnouncedTo) >= ((ZT_MULTICAST_LIKE_EXPIRE / 2) - 1000)) {
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__lastAnnouncedTo = now;
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Packet outp(_id.address(),RR->identity.address(),Packet::VERB_MULTICAST_LIKE);
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std::vector< SharedPtr<Network> > networks(RR->nc->networks());
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for(std::vector< SharedPtr<Network> >::iterator n(networks.begin());n!=networks.end();++n) {
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if ( ((*n)->isAllowed(_id.address())) || ((*n)->controller() == _id.address()) || (RR->topology->isSupernode(_id.address())) ) {
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std::set<MulticastGroup> mgs((*n)->multicastGroups());
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for(std::set<MulticastGroup>::iterator mg(mgs.begin());mg!=mgs.end();++mg) {
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if ((outp.size() + 18) > ZT_UDP_DEFAULT_PAYLOAD_MTU) {
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outp.armor(_key,true);
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fromSock->send(remoteAddr,outp.data(),outp.size());
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outp.reset(_id.address(),RR->identity.address(),Packet::VERB_MULTICAST_LIKE);
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}
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// network ID, MAC, ADI
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outp.append((uint64_t)(*n)->id());
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mg->mac().appendTo(outp);
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outp.append((uint32_t)mg->adi());
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}
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}
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}
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if (outp.size() > ZT_PROTO_MIN_PACKET_LENGTH) {
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outp.armor(_key,true);
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fromSock->send(remoteAddr,outp.data(),outp.size());
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}
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}
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}
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if ((verb == Packet::VERB_FRAME)||(verb == Packet::VERB_EXT_FRAME))
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_lastUnicastFrame = now;
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else if ((verb == Packet::VERB_P5_MULTICAST_FRAME)||(verb == Packet::VERB_MULTICAST_FRAME))
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_lastMulticastFrame = now;
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}
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Path::Type Peer::send(const RuntimeEnvironment *RR,const void *data,unsigned int len,uint64_t now)
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{
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Mutex::Lock _l(_lock);
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/* For sending ordinary packets, paths are divided into two categories:
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* "normal" and "TCP out." Normal includes UDP and incoming TCP. We want
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* to treat outbound TCP differently since if we use it it may end up
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* overriding UDP and UDP performs much better. We only want to initiate
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* TCP if it looks like UDP isn't available. */
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Path *bestNormalPath = (Path *)0;
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Path *bestTcpOutPath = (Path *)0;
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uint64_t bestNormalPathLastReceived = 0;
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uint64_t bestTcpOutPathLastReceived = 0;
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for(std::vector<Path>::iterator p(_paths.begin());p!=_paths.end();++p) {
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uint64_t lr = p->lastReceived();
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if (p->type() == Path::PATH_TYPE_TCP_OUT) {
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if (lr >= bestTcpOutPathLastReceived) {
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bestTcpOutPathLastReceived = lr;
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bestTcpOutPath = &(*p);
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}
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} else {
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if (lr >= bestNormalPathLastReceived) {
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bestNormalPathLastReceived = lr;
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bestNormalPath = &(*p);
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}
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}
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}
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Path *bestPath = (Path *)0;
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if (bestTcpOutPath) { // we have a TCP out path
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if (bestNormalPath) { // we have both paths, decide which to use
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if (RR->tcpTunnelingEnabled) { // TCP tunneling is enabled, so use normal path only if it looks alive
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if ((bestNormalPathLastReceived > RR->timeOfLastResynchronize)&&((now - bestNormalPathLastReceived) < ZT_PEER_PATH_ACTIVITY_TIMEOUT))
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bestPath = bestNormalPath;
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else bestPath = bestTcpOutPath;
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} else { // TCP tunneling is disabled, use normal path
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bestPath = bestNormalPath;
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}
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} else { // we only have a TCP_OUT path, so use it regardless
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bestPath = bestTcpOutPath;
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}
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} else { // we only have a normal path (or none at all, that case is caught below)
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bestPath = bestNormalPath;
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}
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if (!bestPath)
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return Path::PATH_TYPE_NULL;
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RR->antiRec->logOutgoingZT(data,len);
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if (RR->sm->send(bestPath->address(),bestPath->tcp(),bestPath->type() == Path::PATH_TYPE_TCP_OUT,data,len)) {
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bestPath->sent(now);
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return bestPath->type();
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}
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return Path::PATH_TYPE_NULL;
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}
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bool Peer::sendPing(const RuntimeEnvironment *RR,uint64_t now)
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{
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bool sent = false;
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SharedPtr<Peer> self(this);
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Mutex::Lock _l(_lock);
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/* Ping (and thus open) outbound TCP connections if we have no other options
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* or if the TCP tunneling master switch is enabled and pings have been
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* unanswered for ZT_TCP_TUNNEL_FAILOVER_TIMEOUT ms over normal channels. */
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uint64_t lastNormalPingSent = 0;
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uint64_t lastNormalReceive = 0;
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bool haveNormal = false;
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for(std::vector<Path>::const_iterator p(_paths.begin());p!=_paths.end();++p) {
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if (p->type() != Path::PATH_TYPE_TCP_OUT) {
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lastNormalPingSent = std::max(lastNormalPingSent,p->lastPing());
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lastNormalReceive = std::max(lastNormalReceive,p->lastReceived());
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haveNormal = true;
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}
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}
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const bool useTcpOut = ( (!haveNormal) || ( (RR->tcpTunnelingEnabled) && (lastNormalPingSent > RR->timeOfLastResynchronize) && (lastNormalPingSent > lastNormalReceive) && ((lastNormalPingSent - lastNormalReceive) >= ZT_TCP_TUNNEL_FAILOVER_TIMEOUT) ) );
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TRACE("PING %s (useTcpOut==%d)",_id.address().toString().c_str(),(int)useTcpOut);
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for(std::vector<Path>::iterator p(_paths.begin());p!=_paths.end();++p) {
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if ((useTcpOut)||(p->type() != Path::PATH_TYPE_TCP_OUT)) {
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p->pinged(now); // attempts to ping are logged whether they look successful or not
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if (RR->sw->sendHELLO(self,*p)) {
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p->sent(now);
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sent = true;
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}
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}
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}
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return sent;
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}
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void Peer::clean(uint64_t now)
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{
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Mutex::Lock _l(_lock);
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unsigned long i = 0,o = 0,l = (unsigned long)_paths.size();
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while (i != l) {
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if (_paths[i].active(now)) // active includes fixed
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_paths[o++] = _paths[i];
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++i;
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}
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_paths.resize(o);
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}
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void Peer::getBestActiveUdpPathAddresses(uint64_t now,InetAddress &v4,InetAddress &v6) const
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{
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uint64_t bestV4 = 0,bestV6 = 0;
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Mutex::Lock _l(_lock);
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for(std::vector<Path>::const_iterator p(_paths.begin());p!=_paths.end();++p) {
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if ((p->type() == Path::PATH_TYPE_UDP)&&(p->active(now))) {
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uint64_t lr = p->lastReceived();
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if (lr) {
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if (p->address().isV4()) {
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if (lr >= bestV4) {
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bestV4 = lr;
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v4 = p->address();
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}
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} else if (p->address().isV6()) {
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if (lr >= bestV6) {
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bestV6 = lr;
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v6 = p->address();
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}
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}
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}
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}
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}
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}
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} // namespace ZeroTier
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