mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
377 lines
11 KiB
C++
377 lines
11 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2015 ZeroTier, Inc.
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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 "../version.h"
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#include "Constants.hpp"
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#include "Peer.hpp"
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#include "Node.hpp"
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#include "Switch.hpp"
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#include "Network.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(const Identity &myIdentity,const Identity &peerIdentity)
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throw(std::runtime_error) :
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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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_lastPathConfirmationSent(0),
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_lastDirectPathPush(0),
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_vMajor(0),
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_vMinor(0),
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_vRevision(0),
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_id(peerIdentity),
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_numPaths(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::received(
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const RuntimeEnvironment *RR,
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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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{
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const uint64_t now = RR->node->now();
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_lastReceive = now;
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if (!hops) {
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bool pathIsConfirmed = false;
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/* Learn new paths from direct (hops == 0) packets */
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{
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unsigned int np = _numPaths;
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for(unsigned int p=0;p<np;++p) {
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if (_paths[p].address() == remoteAddr) {
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_paths[p].received(now);
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pathIsConfirmed = true;
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break;
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}
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}
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if (!pathIsConfirmed) {
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if ((verb == Packet::VERB_OK)&&(inReVerb == Packet::VERB_HELLO)) {
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// Learn paths if they've been confirmed via a HELLO
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RemotePath *slot = (RemotePath *)0;
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if (np < ZT1_MAX_PEER_NETWORK_PATHS) {
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// Add new path
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slot = &(_paths[np++]);
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} else {
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// Replace oldest non-fixed path
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uint64_t slotLRmin = 0xffffffffffffffffULL;
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for(unsigned int p=0;p<ZT1_MAX_PEER_NETWORK_PATHS;++p) {
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if ((!_paths[p].fixed())&&(_paths[p].lastReceived() <= slotLRmin)) {
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slotLRmin = _paths[p].lastReceived();
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slot = &(_paths[p]);
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}
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}
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}
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if (slot) {
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*slot = RemotePath(remoteAddr,false);
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slot->received(now);
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_numPaths = np;
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pathIsConfirmed = true;
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}
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} else {
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/* If this path is not known, send a HELLO. We don't learn
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* paths without confirming that a bidirectional link is in
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* fact present, but any packet that decodes and authenticates
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* correctly is considered valid. */
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if ((now - _lastPathConfirmationSent) >= ZT_MIN_PATH_CONFIRMATION_INTERVAL) {
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_lastPathConfirmationSent = now;
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TRACE("got %s via unknown path %s(%s), confirming...",Packet::verbString(verb),_id.address().toString().c_str(),remoteAddr.toString().c_str());
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attemptToContactAt(RR,remoteAddr,now);
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}
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}
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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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* root servers and network controllers. */
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if ((pathIsConfirmed)&&((now - _lastAnnouncedTo) >= ((ZT_MULTICAST_LIKE_EXPIRE / 2) - 1000))) {
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_lastAnnouncedTo = now;
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const bool isRoot = RR->topology->isRoot(_id);
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Packet outp(_id.address(),RR->identity.address(),Packet::VERB_MULTICAST_LIKE);
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const std::vector< SharedPtr<Network> > networks(RR->node->allNetworks());
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for(std::vector< SharedPtr<Network> >::const_iterator n(networks.begin());n!=networks.end();++n) {
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if ( (isRoot) || ((*n)->isAllowed(_id.address())) ) {
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const std::vector<MulticastGroup> mgs((*n)->allMulticastGroups());
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for(std::vector<MulticastGroup>::const_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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RR->node->putPacket(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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RR->node->putPacket(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_MULTICAST_FRAME)
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_lastMulticastFrame = now;
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}
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RemotePath *Peer::getBestPath(uint64_t now)
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{
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RemotePath *bestPath = (RemotePath *)0;
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uint64_t lrMax = 0;
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int rank = 0;
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for(unsigned int p=0,np=_numPaths;p<np;++p) {
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if ( (_paths[p].active(now)) && ((_paths[p].lastReceived() >= lrMax)||(_paths[p].preferenceRank() >= rank)) ) {
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lrMax = _paths[p].lastReceived();
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rank = _paths[p].preferenceRank();
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bestPath = &(_paths[p]);
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}
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}
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return bestPath;
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}
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void Peer::attemptToContactAt(const RuntimeEnvironment *RR,const InetAddress &atAddress,uint64_t now)
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{
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Packet outp(_id.address(),RR->identity.address(),Packet::VERB_HELLO);
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outp.append((unsigned char)ZT_PROTO_VERSION);
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outp.append((unsigned char)ZEROTIER_ONE_VERSION_MAJOR);
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outp.append((unsigned char)ZEROTIER_ONE_VERSION_MINOR);
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outp.append((uint16_t)ZEROTIER_ONE_VERSION_REVISION);
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outp.append(now);
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RR->identity.serialize(outp,false);
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switch(atAddress.ss_family) {
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case AF_INET:
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outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_IPV4);
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outp.append(atAddress.rawIpData(),4);
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outp.append((uint16_t)atAddress.port());
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break;
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case AF_INET6:
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outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_IPV6);
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outp.append(atAddress.rawIpData(),16);
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outp.append((uint16_t)atAddress.port());
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break;
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default:
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outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_NONE);
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break;
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}
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outp.armor(_key,false); // HELLO is sent in the clear
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RR->node->putPacket(atAddress,outp.data(),outp.size());
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}
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void Peer::doPingAndKeepalive(const RuntimeEnvironment *RR,uint64_t now)
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{
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RemotePath *const bestPath = getBestPath(now);
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if ((bestPath)&&(bestPath->active(now))) {
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if ((now - bestPath->lastReceived()) >= ZT_PEER_DIRECT_PING_DELAY) {
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TRACE("PING %s(%s)",_id.address().toString().c_str(),bestPath->address().toString().c_str());
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attemptToContactAt(RR,bestPath->address(),now);
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bestPath->sent(now);
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} else if (((now - bestPath->lastSend()) >= ZT_NAT_KEEPALIVE_DELAY)&&(!bestPath->reliable())) {
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TRACE("NAT keepalive %s(%s)",_id.address().toString().c_str(),bestPath->address().toString().c_str());
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RR->node->putPacket(bestPath->address(),"",0);
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bestPath->sent(now);
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}
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}
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}
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void Peer::pushDirectPaths(const RuntimeEnvironment *RR,RemotePath *path,uint64_t now,bool force)
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{
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if ((((now - _lastDirectPathPush) >= ZT_DIRECT_PATH_PUSH_INTERVAL)||(force))) {
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_lastDirectPathPush = now;
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std::vector<Path> dps(RR->node->directPaths());
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TRACE("pushing %u direct paths (local interface addresses) to %s",(unsigned int)dps.size(),_id.address().toString().c_str());
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std::vector<Path>::const_iterator p(dps.begin());
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while (p != dps.end()) {
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Packet outp(_id.address(),RR->identity.address(),Packet::VERB_PUSH_DIRECT_PATHS);
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outp.addSize(2); // leave room for count
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unsigned int count = 0;
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while ((p != dps.end())&&((outp.size() + 24) < ZT_PROTO_MAX_PACKET_LENGTH)) {
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uint8_t addressType = 4;
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switch(p->address().ss_family) {
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case AF_INET:
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break;
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case AF_INET6:
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addressType = 6;
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break;
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default: // we currently only push IP addresses
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++p;
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continue;
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}
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uint8_t flags = 0;
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switch(p->trust()) {
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default:
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break;
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case Path::TRUST_PRIVACY:
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flags |= 0x04; // no encryption
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break;
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case Path::TRUST_ULTIMATE:
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flags |= (0x04 | 0x08); // no encryption, no authentication (redundant but go ahead and set both)
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break;
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}
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outp.append(flags);
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outp.append((uint16_t)0); // no extensions
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outp.append(addressType);
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outp.append((uint8_t)((addressType == 4) ? 6 : 18));
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outp.append(p->address().rawIpData(),((addressType == 4) ? 4 : 16));
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outp.append((uint16_t)p->address().port());
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++count;
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++p;
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}
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if (count) {
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outp.setAt(ZT_PACKET_IDX_PAYLOAD,(uint16_t)count);
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outp.armor(_key,true);
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path->send(RR,outp.data(),outp.size(),now);
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}
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}
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}
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}
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void Peer::addPath(const RemotePath &newp)
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{
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unsigned int np = _numPaths;
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for(unsigned int p=0;p<np;++p) {
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if (_paths[p].address() == newp.address()) {
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_paths[p].setFixed(newp.fixed());
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return;
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}
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}
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RemotePath *slot = (RemotePath *)0;
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if (np < ZT1_MAX_PEER_NETWORK_PATHS) {
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// Add new path
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slot = &(_paths[np++]);
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} else {
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// Replace oldest non-fixed path
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uint64_t slotLRmin = 0xffffffffffffffffULL;
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for(unsigned int p=0;p<ZT1_MAX_PEER_NETWORK_PATHS;++p) {
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if ((!_paths[p].fixed())&&(_paths[p].lastReceived() <= slotLRmin)) {
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slotLRmin = _paths[p].lastReceived();
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slot = &(_paths[p]);
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}
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}
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}
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if (slot) {
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*slot = newp;
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_numPaths = np;
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}
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}
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void Peer::clearPaths(bool fixedToo)
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{
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if (fixedToo) {
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_numPaths = 0;
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} else {
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unsigned int np = _numPaths;
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unsigned int x = 0;
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unsigned int y = 0;
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while (x < np) {
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if (_paths[x].fixed())
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_paths[y++] = _paths[x];
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++x;
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}
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_numPaths = y;
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}
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}
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bool Peer::resetWithinScope(const RuntimeEnvironment *RR,InetAddress::IpScope scope,uint64_t now)
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{
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unsigned int np = _numPaths;
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unsigned int x = 0;
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unsigned int y = 0;
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while (x < np) {
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if (_paths[x].address().ipScope() == scope) {
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if (_paths[x].fixed()) {
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attemptToContactAt(RR,_paths[x].address(),now);
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_paths[y++] = _paths[x]; // keep fixed paths
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}
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} else {
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_paths[y++] = _paths[x]; // keep paths not in this scope
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}
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++x;
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}
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_numPaths = y;
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return (y < np);
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}
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void Peer::getBestActiveAddresses(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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for(unsigned int p=0,np=_numPaths;p<np;++p) {
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if (_paths[p].active(now)) {
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uint64_t lr = _paths[p].lastReceived();
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if (lr) {
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if (_paths[p].address().isV4()) {
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if (lr >= bestV4) {
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bestV4 = lr;
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v4 = _paths[p].address();
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}
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} else if (_paths[p].address().isV6()) {
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if (lr >= bestV6) {
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bestV6 = lr;
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v6 = _paths[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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