mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 13:07:55 +00:00
454 lines
14 KiB
C++
454 lines
14 KiB
C++
/*
|
|
* ZeroTier One - Network Virtualization Everywhere
|
|
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include "../version.h"
|
|
|
|
#include "Constants.hpp"
|
|
#include "Peer.hpp"
|
|
#include "Node.hpp"
|
|
#include "Switch.hpp"
|
|
#include "Network.hpp"
|
|
#include "SelfAwareness.hpp"
|
|
#include "Cluster.hpp"
|
|
#include "Packet.hpp"
|
|
|
|
#ifndef AF_MAX
|
|
#if AF_INET > AF_INET6
|
|
#define AF_MAX AF_INET
|
|
#else
|
|
#define AF_MAX AF_INET6
|
|
#endif
|
|
#endif
|
|
|
|
namespace ZeroTier {
|
|
|
|
// Used to send varying values for NAT keepalive
|
|
static uint32_t _natKeepaliveBuf = 0;
|
|
|
|
Peer::Peer(const RuntimeEnvironment *renv,const Identity &myIdentity,const Identity &peerIdentity) :
|
|
_lastReceive(0),
|
|
_lastUnicastFrame(0),
|
|
_lastMulticastFrame(0),
|
|
_lastDirectPathPushSent(0),
|
|
_lastDirectPathPushReceive(0),
|
|
_lastCredentialRequestSent(0),
|
|
_lastWhoisRequestReceived(0),
|
|
_lastEchoRequestReceived(0),
|
|
_lastComRequestReceived(0),
|
|
_lastComRequestSent(0),
|
|
_lastCredentialsReceived(0),
|
|
_lastTrustEstablishedPacketReceived(0),
|
|
RR(renv),
|
|
_remoteClusterOptimal4(0),
|
|
_vProto(0),
|
|
_vMajor(0),
|
|
_vMinor(0),
|
|
_vRevision(0),
|
|
_id(peerIdentity),
|
|
_numPaths(0),
|
|
_latency(0),
|
|
_directPathPushCutoffCount(0),
|
|
_credentialsCutoffCount(0)
|
|
{
|
|
memset(_remoteClusterOptimal6,0,sizeof(_remoteClusterOptimal6));
|
|
if (!myIdentity.agree(peerIdentity,_key,ZT_PEER_SECRET_KEY_LENGTH))
|
|
throw std::runtime_error("new peer identity key agreement failed");
|
|
}
|
|
|
|
void Peer::received(
|
|
const SharedPtr<Path> &path,
|
|
const unsigned int hops,
|
|
const uint64_t packetId,
|
|
const Packet::Verb verb,
|
|
const uint64_t inRePacketId,
|
|
const Packet::Verb inReVerb,
|
|
const bool trustEstablished)
|
|
{
|
|
const uint64_t now = RR->node->now();
|
|
|
|
#ifdef ZT_ENABLE_CLUSTER
|
|
bool suboptimalPath = false;
|
|
if ((RR->cluster)&&(hops == 0)) {
|
|
// Note: findBetterEndpoint() is first since we still want to check
|
|
// for a better endpoint even if we don't actually send a redirect.
|
|
InetAddress redirectTo;
|
|
if ( (verb != Packet::VERB_OK) && (verb != Packet::VERB_ERROR) && (verb != Packet::VERB_RENDEZVOUS) && (verb != Packet::VERB_PUSH_DIRECT_PATHS) && (RR->cluster->findBetterEndpoint(redirectTo,_id.address(),path->address(),false)) ) {
|
|
if (_vProto >= 5) {
|
|
// For newer peers we can send a more idiomatic verb: PUSH_DIRECT_PATHS.
|
|
Packet outp(_id.address(),RR->identity.address(),Packet::VERB_PUSH_DIRECT_PATHS);
|
|
outp.append((uint16_t)1); // count == 1
|
|
outp.append((uint8_t)ZT_PUSH_DIRECT_PATHS_FLAG_CLUSTER_REDIRECT); // flags: cluster redirect
|
|
outp.append((uint16_t)0); // no extensions
|
|
if (redirectTo.ss_family == AF_INET) {
|
|
outp.append((uint8_t)4);
|
|
outp.append((uint8_t)6);
|
|
outp.append(redirectTo.rawIpData(),4);
|
|
} else {
|
|
outp.append((uint8_t)6);
|
|
outp.append((uint8_t)18);
|
|
outp.append(redirectTo.rawIpData(),16);
|
|
}
|
|
outp.append((uint16_t)redirectTo.port());
|
|
outp.armor(_key,true);
|
|
path->send(RR,outp.data(),outp.size(),now);
|
|
} else {
|
|
// For older peers we use RENDEZVOUS to coax them into contacting us elsewhere.
|
|
Packet outp(_id.address(),RR->identity.address(),Packet::VERB_RENDEZVOUS);
|
|
outp.append((uint8_t)0); // no flags
|
|
RR->identity.address().appendTo(outp);
|
|
outp.append((uint16_t)redirectTo.port());
|
|
if (redirectTo.ss_family == AF_INET) {
|
|
outp.append((uint8_t)4);
|
|
outp.append(redirectTo.rawIpData(),4);
|
|
} else {
|
|
outp.append((uint8_t)16);
|
|
outp.append(redirectTo.rawIpData(),16);
|
|
}
|
|
outp.armor(_key,true);
|
|
path->send(RR,outp.data(),outp.size(),now);
|
|
}
|
|
suboptimalPath = true;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
_lastReceive = now;
|
|
if ((verb == Packet::VERB_FRAME)||(verb == Packet::VERB_EXT_FRAME))
|
|
_lastUnicastFrame = now;
|
|
else if (verb == Packet::VERB_MULTICAST_FRAME)
|
|
_lastMulticastFrame = now;
|
|
|
|
if (trustEstablished) {
|
|
_lastTrustEstablishedPacketReceived = now;
|
|
path->trustedPacketReceived(now);
|
|
}
|
|
|
|
if (hops == 0) {
|
|
bool pathIsConfirmed = false;
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if (_paths[p].path->address() == path->address()) {
|
|
_paths[p].lastReceive = now;
|
|
_paths[p].path = path; // local address may have changed!
|
|
#ifdef ZT_ENABLE_CLUSTER
|
|
_paths[p].localClusterSuboptimal = suboptimalPath;
|
|
#endif
|
|
pathIsConfirmed = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( (!pathIsConfirmed) && (RR->node->shouldUsePathForZeroTierTraffic(path->localAddress(),path->address())) ) {
|
|
if (verb == Packet::VERB_OK) {
|
|
Mutex::Lock _l(_paths_m);
|
|
|
|
// Since this is a new path, figure out where to put it (possibly replacing an old/dead one)
|
|
unsigned int slot;
|
|
if (_numPaths < ZT_MAX_PEER_NETWORK_PATHS) {
|
|
slot = _numPaths++;
|
|
} else {
|
|
// First try to replace the worst within the same address family, if possible
|
|
int worstSlot = -1;
|
|
uint64_t worstScore = 0xffffffffffffffffULL;
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if (_paths[p].path->address().ss_family == path->address().ss_family) {
|
|
const uint64_t s = _pathScore(p,now);
|
|
if (s < worstScore) {
|
|
worstScore = s;
|
|
worstSlot = (int)p;
|
|
}
|
|
}
|
|
}
|
|
if (worstSlot >= 0) {
|
|
slot = (unsigned int)worstSlot;
|
|
} else {
|
|
// If we can't find one with the same family, replace the worst of any family
|
|
slot = ZT_MAX_PEER_NETWORK_PATHS - 1;
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
const uint64_t s = _pathScore(p,now);
|
|
if (s < worstScore) {
|
|
worstScore = s;
|
|
slot = p;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
_paths[slot].lastReceive = now;
|
|
_paths[slot].path = path;
|
|
#ifdef ZT_ENABLE_CLUSTER
|
|
_paths[slot].localClusterSuboptimal = suboptimalPath;
|
|
if (RR->cluster)
|
|
RR->cluster->broadcastHavePeer(_id);
|
|
#endif
|
|
} else {
|
|
TRACE("got %s via unknown path %s(%s), confirming...",Packet::verbString(verb),_id.address().toString().c_str(),path->address().toString().c_str());
|
|
attemptToContactAt(path->localAddress(),path->address(),now);
|
|
path->sent(now);
|
|
}
|
|
}
|
|
} else if (trustEstablished) {
|
|
// Send PUSH_DIRECT_PATHS if hops>0 (relayed) and we have a trust relationship (common network membership)
|
|
#ifdef ZT_ENABLE_CLUSTER
|
|
// Cluster mode disables normal PUSH_DIRECT_PATHS in favor of cluster-based peer redirection
|
|
const bool haveCluster = (RR->cluster);
|
|
#else
|
|
const bool haveCluster = false;
|
|
#endif
|
|
if ( ((now - _lastDirectPathPushSent) >= ZT_DIRECT_PATH_PUSH_INTERVAL) && (!haveCluster) ) {
|
|
_lastDirectPathPushSent = now;
|
|
|
|
std::vector<InetAddress> pathsToPush;
|
|
|
|
std::vector<InetAddress> dps(RR->node->directPaths());
|
|
for(std::vector<InetAddress>::const_iterator i(dps.begin());i!=dps.end();++i)
|
|
pathsToPush.push_back(*i);
|
|
|
|
std::vector<InetAddress> sym(RR->sa->getSymmetricNatPredictions());
|
|
for(unsigned long i=0,added=0;i<sym.size();++i) {
|
|
InetAddress tmp(sym[(unsigned long)RR->node->prng() % sym.size()]);
|
|
if (std::find(pathsToPush.begin(),pathsToPush.end(),tmp) == pathsToPush.end()) {
|
|
pathsToPush.push_back(tmp);
|
|
if (++added >= ZT_PUSH_DIRECT_PATHS_MAX_PER_SCOPE_AND_FAMILY)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (pathsToPush.size() > 0) {
|
|
#ifdef ZT_TRACE
|
|
std::string ps;
|
|
for(std::vector<InetAddress>::const_iterator p(pathsToPush.begin());p!=pathsToPush.end();++p) {
|
|
if (ps.length() > 0)
|
|
ps.push_back(',');
|
|
ps.append(p->toString());
|
|
}
|
|
TRACE("pushing %u direct paths to %s: %s",(unsigned int)pathsToPush.size(),_id.address().toString().c_str(),ps.c_str());
|
|
#endif
|
|
|
|
std::vector<InetAddress>::const_iterator p(pathsToPush.begin());
|
|
while (p != pathsToPush.end()) {
|
|
Packet outp(_id.address(),RR->identity.address(),Packet::VERB_PUSH_DIRECT_PATHS);
|
|
outp.addSize(2); // leave room for count
|
|
|
|
unsigned int count = 0;
|
|
while ((p != pathsToPush.end())&&((outp.size() + 24) < 1200)) {
|
|
uint8_t addressType = 4;
|
|
switch(p->ss_family) {
|
|
case AF_INET:
|
|
break;
|
|
case AF_INET6:
|
|
addressType = 6;
|
|
break;
|
|
default: // we currently only push IP addresses
|
|
++p;
|
|
continue;
|
|
}
|
|
|
|
outp.append((uint8_t)0); // no flags
|
|
outp.append((uint16_t)0); // no extensions
|
|
outp.append(addressType);
|
|
outp.append((uint8_t)((addressType == 4) ? 6 : 18));
|
|
outp.append(p->rawIpData(),((addressType == 4) ? 4 : 16));
|
|
outp.append((uint16_t)p->port());
|
|
|
|
++count;
|
|
++p;
|
|
}
|
|
|
|
if (count) {
|
|
outp.setAt(ZT_PACKET_IDX_PAYLOAD,(uint16_t)count);
|
|
outp.armor(_key,true);
|
|
path->send(RR,outp.data(),outp.size(),now);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bool Peer::hasActivePathTo(uint64_t now,const InetAddress &addr) const
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if ( (_paths[p].path->address() == addr) && ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && (_paths[p].path->alive(now)) )
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool Peer::sendDirect(const void *data,unsigned int len,uint64_t now,bool forceEvenIfDead)
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
|
|
int bestp = -1;
|
|
uint64_t best = 0ULL;
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && (_paths[p].path->alive(now)||(forceEvenIfDead)) ) {
|
|
const uint64_t s = _pathScore(p,now);
|
|
if (s >= best) {
|
|
best = s;
|
|
bestp = (int)p;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (bestp >= 0) {
|
|
return _paths[bestp].path->send(RR,data,len,now);
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
SharedPtr<Path> Peer::getBestPath(uint64_t now,bool includeExpired)
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
|
|
int bestp = -1;
|
|
uint64_t best = 0ULL;
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) || (includeExpired) ) {
|
|
const uint64_t s = _pathScore(p,now);
|
|
if (s >= best) {
|
|
best = s;
|
|
bestp = (int)p;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (bestp >= 0) {
|
|
return _paths[bestp].path;
|
|
} else {
|
|
return SharedPtr<Path>();
|
|
}
|
|
}
|
|
|
|
void Peer::sendHELLO(const InetAddress &localAddr,const InetAddress &atAddress,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);
|
|
atAddress.serialize(outp);
|
|
outp.append((uint64_t)RR->topology->worldId());
|
|
outp.append((uint64_t)RR->topology->worldTimestamp());
|
|
RR->node->expectReplyTo(outp.packetId());
|
|
outp.armor(_key,false); // HELLO is sent in the clear
|
|
RR->node->putPacket(localAddr,atAddress,outp.data(),outp.size());
|
|
}
|
|
|
|
void Peer::attemptToContactAt(const InetAddress &localAddr,const InetAddress &atAddress,uint64_t now)
|
|
{
|
|
if ( (_vProto >= 5) && ( !((_vMajor == 1)&&(_vMinor == 1)&&(_vRevision == 0)) ) ) {
|
|
Packet outp(_id.address(),RR->identity.address(),Packet::VERB_ECHO);
|
|
RR->node->expectReplyTo(outp.packetId());
|
|
outp.armor(_key,true);
|
|
RR->node->putPacket(localAddr,atAddress,outp.data(),outp.size());
|
|
} else {
|
|
sendHELLO(localAddr,atAddress,now);
|
|
}
|
|
}
|
|
|
|
bool Peer::doPingAndKeepalive(uint64_t now,int inetAddressFamily)
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
|
|
int bestp = -1;
|
|
uint64_t best = 0ULL;
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && ((inetAddressFamily < 0)||((int)_paths[p].path->address().ss_family == inetAddressFamily)) ) {
|
|
const uint64_t s = _pathScore(p,now);
|
|
if (s >= best) {
|
|
best = s;
|
|
bestp = (int)p;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (bestp >= 0) {
|
|
if ((now - _paths[bestp].lastReceive) >= ZT_PEER_PING_PERIOD) {
|
|
attemptToContactAt(_paths[bestp].path->localAddress(),_paths[bestp].path->address(),now);
|
|
_paths[bestp].path->sent(now);
|
|
} else if (_paths[bestp].path->needsHeartbeat(now)) {
|
|
_natKeepaliveBuf += (uint32_t)((now * 0x9e3779b1) >> 1); // tumble this around to send constantly varying (meaningless) payloads
|
|
_paths[bestp].path->send(RR,&_natKeepaliveBuf,sizeof(_natKeepaliveBuf),now);
|
|
}
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool Peer::hasActiveDirectPath(uint64_t now) const
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if (((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION)&&(_paths[p].path->alive(now)))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void Peer::resetWithinScope(InetAddress::IpScope scope,int inetAddressFamily,uint64_t now)
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if ( (_paths[p].path->address().ss_family == inetAddressFamily) && (_paths[p].path->address().ipScope() == scope) ) {
|
|
attemptToContactAt(_paths[p].path->localAddress(),_paths[p].path->address(),now);
|
|
_paths[p].path->sent(now);
|
|
_paths[p].lastReceive = 0; // path will not be used unless it speaks again
|
|
}
|
|
}
|
|
}
|
|
|
|
void Peer::getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6) const
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
|
|
int bestp4 = -1,bestp6 = -1;
|
|
uint64_t best4 = 0ULL,best6 = 0ULL;
|
|
for(unsigned int p=0;p<_numPaths;++p) {
|
|
if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && (_paths[p].path->alive(now)) ) {
|
|
if (_paths[p].path->address().ss_family == AF_INET) {
|
|
const uint64_t s = _pathScore(p,now);
|
|
if (s >= best4) {
|
|
best4 = s;
|
|
bestp4 = (int)p;
|
|
}
|
|
} else if (_paths[p].path->address().ss_family == AF_INET6) {
|
|
const uint64_t s = _pathScore(p,now);
|
|
if (s >= best6) {
|
|
best6 = s;
|
|
bestp6 = (int)p;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (bestp4 >= 0)
|
|
v4 = _paths[bestp4].path->address();
|
|
if (bestp6 >= 0)
|
|
v6 = _paths[bestp6].path->address();
|
|
}
|
|
|
|
} // namespace ZeroTier
|