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ZeroTierOne/node/IncomingPacket.cpp

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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 <string.h>
#include <stdlib.h>
#include "../version.h"
#include "Constants.hpp"
#include "Defaults.hpp"
#include "RuntimeEnvironment.hpp"
#include "IncomingPacket.hpp"
#include "Topology.hpp"
#include "Switch.hpp"
#include "Peer.hpp"
#include "NetworkController.hpp"
#include "SelfAwareness.hpp"
namespace ZeroTier {
bool IncomingPacket::tryDecode(const RuntimeEnvironment *RR)
{
try {
if ((cipher() == ZT_PROTO_CIPHER_SUITE__C25519_POLY1305_NONE)&&(verb() == Packet::VERB_HELLO)) {
// Unencrypted HELLOs are handled here since they are used to
// populate our identity cache in the first place. _doHELLO() is special
// in that it contains its own authentication logic.
return _doHELLO(RR);
}
SharedPtr<Peer> peer = RR->topology->getPeer(source());
if (peer) {
if (!dearmor(peer->key())) {
TRACE("dropped packet from %s(%s), MAC authentication failed (size: %u)",source().toString().c_str(),_remoteAddress.toString().c_str(),size());
return true;
}
if (!uncompress()) {
TRACE("dropped packet from %s(%s), compressed data invalid",source().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
//TRACE("<< %s from %s(%s)",Packet::verbString(verb()),source().toString().c_str(),_remoteAddress.toString().c_str());
switch(verb()) {
//case Packet::VERB_NOP:
default: // ignore unknown verbs, but if they pass auth check they are "received"
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),verb(),0,Packet::VERB_NOP);
return true;
case Packet::VERB_HELLO: return _doHELLO(RR);
case Packet::VERB_ERROR: return _doERROR(RR,peer);
case Packet::VERB_OK: return _doOK(RR,peer);
case Packet::VERB_WHOIS: return _doWHOIS(RR,peer);
case Packet::VERB_RENDEZVOUS: return _doRENDEZVOUS(RR,peer);
case Packet::VERB_FRAME: return _doFRAME(RR,peer);
case Packet::VERB_EXT_FRAME: return _doEXT_FRAME(RR,peer);
case Packet::VERB_MULTICAST_LIKE: return _doMULTICAST_LIKE(RR,peer);
case Packet::VERB_NETWORK_MEMBERSHIP_CERTIFICATE: return _doNETWORK_MEMBERSHIP_CERTIFICATE(RR,peer);
case Packet::VERB_NETWORK_CONFIG_REQUEST: return _doNETWORK_CONFIG_REQUEST(RR,peer);
case Packet::VERB_NETWORK_CONFIG_REFRESH: return _doNETWORK_CONFIG_REFRESH(RR,peer);
case Packet::VERB_MULTICAST_GATHER: return _doMULTICAST_GATHER(RR,peer);
case Packet::VERB_MULTICAST_FRAME: return _doMULTICAST_FRAME(RR,peer);
}
} else {
RR->sw->requestWhois(source());
return false;
}
} catch ( ... ) {
// Exceptions are more informatively caught in _do...() handlers but
// this outer try/catch will catch anything else odd.
TRACE("dropped ??? from %s(%s): unexpected exception in tryDecode()",source().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
}
bool IncomingPacket::_doERROR(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
const Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_ERROR_IDX_IN_RE_VERB];
const uint64_t inRePacketId = at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_IN_RE_PACKET_ID);
const Packet::ErrorCode errorCode = (Packet::ErrorCode)(*this)[ZT_PROTO_VERB_ERROR_IDX_ERROR_CODE];
//TRACE("ERROR %s from %s(%s) in-re %s",Packet::errorString(errorCode),source().toString().c_str(),_remoteAddress.toString().c_str(),Packet::verbString(inReVerb));
switch(errorCode) {
case Packet::ERROR_OBJ_NOT_FOUND:
if (inReVerb == Packet::VERB_WHOIS) {
if (RR->topology->isSupernode(peer->address()))
RR->sw->cancelWhoisRequest(Address(field(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH));
} else if (inReVerb == Packet::VERB_NETWORK_CONFIG_REQUEST) {
SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD)));
if ((network)&&(network->controller() == source()))
network->setNotFound();
}
break;
case Packet::ERROR_UNSUPPORTED_OPERATION:
if (inReVerb == Packet::VERB_NETWORK_CONFIG_REQUEST) {
SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD)));
if ((network)&&(network->controller() == source()))
network->setNotFound();
}
break;
case Packet::ERROR_IDENTITY_COLLISION:
if (RR->topology->isSupernode(peer->address()))
RR->node->postEvent(ZT1_EVENT_FATAL_ERROR_IDENTITY_COLLISION);
break;
case Packet::ERROR_NEED_MEMBERSHIP_CERTIFICATE: {
SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD)));
if (network) {
SharedPtr<NetworkConfig> nconf(network->config2());
if (nconf) {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_NETWORK_MEMBERSHIP_CERTIFICATE);
nconf->com().serialize(outp);
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
}
} break;
case Packet::ERROR_NETWORK_ACCESS_DENIED_: {
SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD)));
if ((network)&&(network->controller() == source()))
network->setAccessDenied();
} break;
case Packet::ERROR_UNWANTED_MULTICAST: {
// TODO: unsubscribe
} break;
default: break;
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_ERROR,inRePacketId,inReVerb);
} catch (std::exception &ex) {
TRACE("dropped ERROR from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped ERROR from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doHELLO(const RuntimeEnvironment *RR)
{
try {
const unsigned int protoVersion = (*this)[ZT_PROTO_VERB_HELLO_IDX_PROTOCOL_VERSION];
const unsigned int vMajor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MAJOR_VERSION];
const unsigned int vMinor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MINOR_VERSION];
const unsigned int vRevision = at<uint16_t>(ZT_PROTO_VERB_HELLO_IDX_REVISION);
const uint64_t timestamp = at<uint64_t>(ZT_PROTO_VERB_HELLO_IDX_TIMESTAMP);
Identity id;
unsigned int destAddrPtr = id.deserialize(*this,ZT_PROTO_VERB_HELLO_IDX_IDENTITY) + ZT_PROTO_VERB_HELLO_IDX_IDENTITY;
unsigned int destAddrType = ZT_PROTO_DEST_ADDRESS_TYPE_NONE;
if (destAddrPtr < size()) // ZeroTier One < 1.0.3 did not include this field
destAddrType = (*this)[destAddrPtr++];
InetAddress destAddr;
switch(destAddrType) {
case ZT_PROTO_DEST_ADDRESS_TYPE_IPV4:
destAddr.set(field(destAddrPtr,4),4,at<uint16_t>(destAddrPtr + 4));
break;
case ZT_PROTO_DEST_ADDRESS_TYPE_IPV6:
destAddr.set(field(destAddrPtr,16),16,at<uint16_t>(destAddrPtr + 16));
break;
}
if (source() != id.address()) {
TRACE("dropped HELLO from %s(%s): identity not for sending address",source().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
if (protoVersion < ZT_PROTO_VERSION_MIN) {
TRACE("dropped HELLO from %s(%s): protocol version too old",id.address().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
SharedPtr<Peer> peer(RR->topology->getPeer(id.address()));
if (peer) {
// We already have an identity with this address -- check for collisions
if (peer->identity() != id) {
// Identity is different from the one we already have -- address collision
unsigned char key[ZT_PEER_SECRET_KEY_LENGTH];
if (RR->identity.agree(id,key,ZT_PEER_SECRET_KEY_LENGTH)) {
if (dearmor(key)) { // ensure packet is authentic, otherwise drop
RR->node->postEvent(ZT1_EVENT_AUTHENTICATION_FAILURE,(const void *)&_remoteAddress);
TRACE("rejected HELLO from %s(%s): address already claimed",id.address().toString().c_str(),_remoteAddress.toString().c_str());
Packet outp(id.address(),RR->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)Packet::VERB_HELLO);
outp.append(packetId());
outp.append((unsigned char)Packet::ERROR_IDENTITY_COLLISION);
outp.armor(key,true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
} else {
RR->node->postEvent(ZT1_EVENT_AUTHENTICATION_FAILURE,(const void *)&_remoteAddress);
TRACE("rejected HELLO from %s(%s): packet failed authentication",id.address().toString().c_str(),_remoteAddress.toString().c_str());
}
} else {
RR->node->postEvent(ZT1_EVENT_AUTHENTICATION_FAILURE,(const void *)&_remoteAddress);
TRACE("rejected HELLO from %s(%s): key agreement failed",id.address().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
} else {
// Identity is the same as the one we already have -- check packet integrity
if (!dearmor(peer->key())) {
RR->node->postEvent(ZT1_EVENT_AUTHENTICATION_FAILURE,(const void *)&_remoteAddress);
TRACE("rejected HELLO from %s(%s): packet failed authentication",id.address().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
// Continue at // VALID
}
} else {
// We don't already have an identity with this address -- validate and learn it
if (!id.locallyValidate()) {
RR->node->postEvent(ZT1_EVENT_AUTHENTICATION_FAILURE,(const void *)&_remoteAddress);
TRACE("dropped HELLO from %s(%s): identity invalid",id.address().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
SharedPtr<Peer> newPeer(new Peer(RR->identity,id));
if (!dearmor(newPeer->key())) {
RR->node->postEvent(ZT1_EVENT_AUTHENTICATION_FAILURE,(const void *)&_remoteAddress);
TRACE("rejected HELLO from %s(%s): packet failed authentication",id.address().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
peer = RR->topology->addPeer(newPeer);
// Continue at // VALID
}
// VALID -- continues here
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_HELLO,0,Packet::VERB_NOP);
peer->setRemoteVersion(protoVersion,vMajor,vMinor,vRevision);
if (RR->topology->isSupernode(id.address())) {
RR->node->postNewerVersionIfNewer(vMajor,vMinor,vRevision);
RR->sa->iam(_remoteAddress,destAddr,true);
} else {
RR->sa->iam(_remoteAddress,destAddr,false);
}
Packet outp(id.address(),RR->identity.address(),Packet::VERB_OK);
outp.append((unsigned char)Packet::VERB_HELLO);
outp.append(packetId());
outp.append(timestamp);
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);
switch(_remoteAddress.ss_family) {
case AF_INET:
outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_IPV4);
outp.append(_remoteAddress.rawIpData(),4);
outp.append((uint16_t)_remoteAddress.port());
break;
case AF_INET6:
outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_IPV6);
outp.append(_remoteAddress.rawIpData(),16);
outp.append((uint16_t)_remoteAddress.port());
break;
default:
outp.append((unsigned char)ZT_PROTO_DEST_ADDRESS_TYPE_NONE);
break;
}
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
} catch (std::exception &ex) {
TRACE("dropped HELLO from %s(%s): %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped HELLO from %s(%s): unexpected exception",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doOK(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
const Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_OK_IDX_IN_RE_VERB];
const uint64_t inRePacketId = at<uint64_t>(ZT_PROTO_VERB_OK_IDX_IN_RE_PACKET_ID);
//TRACE("%s(%s): OK(%s)",source().toString().c_str(),_remoteAddress.toString().c_str(),Packet::verbString(inReVerb));
switch(inReVerb) {
case Packet::VERB_HELLO: {
const unsigned int latency = std::min((unsigned int)(RR->node->now() - at<uint64_t>(ZT_PROTO_VERB_HELLO__OK__IDX_TIMESTAMP)),(unsigned int)0xffff);
const unsigned int vProto = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_PROTOCOL_VERSION];
const unsigned int vMajor = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_MAJOR_VERSION];
const unsigned int vMinor = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_MINOR_VERSION];
const unsigned int vRevision = at<uint16_t>(ZT_PROTO_VERB_HELLO__OK__IDX_REVISION);
if (vProto < ZT_PROTO_VERSION_MIN) {
TRACE("%s(%s): OK(HELLO) dropped, protocol version too old",source().toString().c_str(),_remoteAddress.toString().c_str());
return true;
}
TRACE("%s(%s): OK(HELLO), version %u.%u.%u, latency %u",source().toString().c_str(),_remoteAddress.toString().c_str(),vMajor,vMinor,vRevision,latency);
peer->addDirectLatencyMeasurment(latency);
peer->setRemoteVersion(vProto,vMajor,vMinor,vRevision);
if (RR->topology->isSupernode(peer->address()))
RR->node->postNewerVersionIfNewer(vMajor,vMinor,vRevision);
} break;
case Packet::VERB_WHOIS: {
// Right now only supernodes are allowed to send OK(WHOIS) to prevent
// poisoning attacks. Further decentralization will require some other
// kind of trust mechanism.
if (RR->topology->isSupernode(peer->address())) {
const Identity id(*this,ZT_PROTO_VERB_WHOIS__OK__IDX_IDENTITY);
if (id.locallyValidate())
RR->sw->doAnythingWaitingForPeer(RR->topology->addPeer(SharedPtr<Peer>(new Peer(RR->identity,id))));
}
} break;
case Packet::VERB_NETWORK_CONFIG_REQUEST: {
const SharedPtr<Network> nw(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_NETWORK_ID)));
if ((nw)&&(nw->controller() == peer->address())) {
const unsigned int dictlen = at<uint16_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_DICT_LEN);
const std::string dict((const char *)field(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_DICT,dictlen),dictlen);
if (dict.length()) {
if (nw->setConfiguration(Dictionary(dict)) == 2) { // 2 == accepted and actually new
/* If this configuration was indeed new, we do another
* controller request with its revision. We do this in
* order to (a) tell the network controller we got it (it
* won't send a duplicate if ts == current), and (b)
* get another one if the controller is changing rapidly
* until we finally have the final version.
*
* Note that we don't do this for network controllers with
* versions <= 1.0.3, since those regenerate a new controller
* with a new revision every time. In that case this double
* confirmation would create a race condition. */
const SharedPtr<NetworkConfig> nc(nw->config2());
if ((peer->atLeastVersion(1,0,3))&&(nc)&&(nc->revision() > 0)) {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append((uint64_t)nw->id());
outp.append((uint16_t)0); // no meta-data
outp.append((uint64_t)nc->revision());
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
}
TRACE("got network configuration for network %.16llx from %s",(unsigned long long)nw->id(),source().toString().c_str());
}
}
} break;
case Packet::VERB_MULTICAST_GATHER: {
const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_NETWORK_ID);
const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_MAC,6),6),at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_ADI));
TRACE("%s(%s): OK(MULTICAST_GATHER) %.16llx/%s length %u",source().toString().c_str(),_remoteAddress.toString().c_str(),nwid,mg.toString().c_str(),size());
const unsigned int count = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 4);
RR->mc->addMultiple(RR->node->now(),nwid,mg,field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 6,count * 5),count,at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS));
} break;
case Packet::VERB_MULTICAST_FRAME: {
const unsigned int flags = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_FLAGS];
const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_NETWORK_ID);
const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_MAC,6),6),at<uint32_t>(ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_ADI));
//TRACE("%s(%s): OK(MULTICAST_FRAME) %.16llx/%s flags %.2x",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),nwid,mg.toString().c_str(),flags);
unsigned int offset = 0;
if ((flags & 0x01) != 0) {
// OK(MULTICAST_FRAME) includes certificate of membership update
CertificateOfMembership com;
offset += com.deserialize(*this,ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS);
SharedPtr<Network> network(RR->node->network(nwid));
if ((network)&&(com.hasRequiredFields()))
network->addMembershipCertificate(com,false);
}
if ((flags & 0x02) != 0) {
// OK(MULTICAST_FRAME) includes implicit gather results
offset += ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS;
unsigned int totalKnown = at<uint32_t>(offset); offset += 4;
unsigned int count = at<uint16_t>(offset); offset += 2;
RR->mc->addMultiple(RR->node->now(),nwid,mg,field(offset,count * 5),count,totalKnown);
}
} break;
default: break;
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_OK,inRePacketId,inReVerb);
} catch (std::exception &ex) {
TRACE("dropped OK from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped OK from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doWHOIS(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
if (payloadLength() == ZT_ADDRESS_LENGTH) {
const SharedPtr<Peer> queried(RR->topology->getPeer(Address(payload(),ZT_ADDRESS_LENGTH)));
if (queried) {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK);
outp.append((unsigned char)Packet::VERB_WHOIS);
outp.append(packetId());
queried->identity().serialize(outp,false);
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
} else {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)Packet::VERB_WHOIS);
outp.append(packetId());
outp.append((unsigned char)Packet::ERROR_OBJ_NOT_FOUND);
outp.append(payload(),ZT_ADDRESS_LENGTH);
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
} else {
TRACE("dropped WHOIS from %s(%s): missing or invalid address",source().toString().c_str(),_remoteAddress.toString().c_str());
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_WHOIS,0,Packet::VERB_NOP);
} catch ( ... ) {
TRACE("dropped WHOIS from %s(%s): unexpected exception",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doRENDEZVOUS(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
/*
* At the moment, we only obey RENDEZVOUS if it comes from a designated
* supernode. If relay offloading is implemented to scale the net, this
* will need reconsideration.
*
* The reason is that RENDEZVOUS could technically be used to cause a
* peer to send a weird encrypted UDP packet to an arbitrary IP:port.
* The sender of RENDEZVOUS has no control over the content of this
* packet, but it's still maybe something we want to not allow just
* anyone to order due to possible DDOS or network forensic implications.
* So if we diversify relays, we'll need some way of deciding whether the
* sender is someone we should trust with a RENDEZVOUS hint.
*/
if (RR->topology->isSupernode(peer->address())) {
const Address with(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ZTADDRESS,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
const SharedPtr<Peer> withPeer(RR->topology->getPeer(with));
if (withPeer) {
const unsigned int port = at<uint16_t>(ZT_PROTO_VERB_RENDEZVOUS_IDX_PORT);
const unsigned int addrlen = (*this)[ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRLEN];
if ((port > 0)&&((addrlen == 4)||(addrlen == 16))) {
InetAddress atAddr(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRESS,addrlen),addrlen,port);
TRACE("RENDEZVOUS from %s says %s might be at %s, starting NAT-t",peer->address().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_RENDEZVOUS,0,Packet::VERB_NOP);
RR->sw->contact(withPeer,atAddr,_linkDesperation);
} else {
TRACE("dropped corrupt RENDEZVOUS from %s(%s) (bad address or port)",peer->address().toString().c_str(),_remoteAddress.toString().c_str());
}
} else {
TRACE("ignored RENDEZVOUS from %s(%s) to meet unknown peer %s",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),with.toString().c_str());
}
} else {
TRACE("ignored RENDEZVOUS from %s(%s): source not supernode",peer->address().toString().c_str(),_remoteAddress.toString().c_str());
}
} catch (std::exception &ex) {
TRACE("dropped RENDEZVOUS from %s(%s): %s",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped RENDEZVOUS from %s(%s): unexpected exception",peer->address().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doFRAME(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
const SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID)));
if (network) {
if (size() > ZT_PROTO_VERB_FRAME_IDX_PAYLOAD) {
if (!network->isAllowed(peer->address())) {
TRACE("dropped FRAME from %s(%s): not a member of private network %.16llx",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),(unsigned long long)network->id());
_sendErrorNeedCertificate(RR,peer,network->id());
return true;
}
const unsigned int etherType = at<uint16_t>(ZT_PROTO_VERB_FRAME_IDX_ETHERTYPE);
if (!network->config()->permitsEtherType(etherType)) {
TRACE("dropped FRAME from %s(%s): ethertype %.4x not allowed on %.16llx",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),(unsigned int)etherType,(unsigned long long)network->id());
return true;
}
const unsigned int payloadLen = size() - ZT_PROTO_VERB_FRAME_IDX_PAYLOAD;
RR->node->putFrame(network->id(),MAC(peer->address(),network->id()),network->mac(),etherType,0,field(ZT_PROTO_VERB_FRAME_IDX_PAYLOAD,payloadLen),payloadLen);
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_FRAME,0,Packet::VERB_NOP);
} else {
TRACE("dropped FRAME from %s(%s): we are not connected to network %.16llx",source().toString().c_str(),_remoteAddress.toString().c_str(),at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID));
}
} catch (std::exception &ex) {
TRACE("dropped FRAME from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped FRAME from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doEXT_FRAME(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
SharedPtr<Network> network(RR->node->network(at<uint64_t>(ZT_PROTO_VERB_EXT_FRAME_IDX_NETWORK_ID)));
if (network) {
if (size() > ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD) {
const unsigned int flags = (*this)[ZT_PROTO_VERB_EXT_FRAME_IDX_FLAGS];
unsigned int comLen = 0;
if ((flags & 0x01) != 0) {
CertificateOfMembership com;
comLen = com.deserialize(*this,ZT_PROTO_VERB_EXT_FRAME_IDX_COM);
if (com.hasRequiredFields())
network->addMembershipCertificate(com,false);
}
if (!network->isAllowed(peer->address())) {
TRACE("dropped EXT_FRAME from %s(%s): not a member of private network %.16llx",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),network->id());
_sendErrorNeedCertificate(RR,peer,network->id());
return true;
}
// Everything after flags must be adjusted based on the length
// of the certificate, if there was one...
const unsigned int etherType = at<uint16_t>(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_ETHERTYPE);
if (!network->config()->permitsEtherType(etherType)) {
TRACE("dropped EXT_FRAME from %s(%s): ethertype %.4x not allowed on network %.16llx",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),(unsigned int)etherType,(unsigned long long)network->id());
return true;
}
const MAC to(field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_TO,ZT_PROTO_VERB_EXT_FRAME_LEN_TO),ZT_PROTO_VERB_EXT_FRAME_LEN_TO);
const MAC from(field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_FROM,ZT_PROTO_VERB_EXT_FRAME_LEN_FROM),ZT_PROTO_VERB_EXT_FRAME_LEN_FROM);
if (to.isMulticast()) {
TRACE("dropped EXT_FRAME from %s@%s(%s) to %s: destination is multicast, must use MULTICAST_FRAME",from.toString().c_str(),peer->address().toString().c_str(),_remoteAddress.toString().c_str(),to.toString().c_str());
return true;
}
if ((!from)||(from.isMulticast())||(from == network->mac())) {
TRACE("dropped EXT_FRAME from %s@%s(%s) to %s: invalid source MAC",from.toString().c_str(),peer->address().toString().c_str(),_remoteAddress.toString().c_str(),to.toString().c_str());
return true;
}
if (from != MAC(peer->address(),network->id())) {
if (network->permitsBridging(peer->address())) {
network->learnBridgeRoute(from,peer->address());
} else {
TRACE("dropped EXT_FRAME from %s@%s(%s) to %s: sender not allowed to bridge into %.16llx",from.toString().c_str(),peer->address().toString().c_str(),_remoteAddress.toString().c_str(),to.toString().c_str(),network->id());
return true;
}
}
if (to != network->mac()) {
if (!network->permitsBridging(RR->identity.address())) {
TRACE("dropped EXT_FRAME from %s@%s(%s) to %s: I cannot bridge to %.16llx or bridging disabled on network",from.toString().c_str(),peer->address().toString().c_str(),_remoteAddress.toString().c_str(),to.toString().c_str(),network->id());
return true;
}
}
const unsigned int payloadLen = size() - (comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD);
RR->node->putFrame(network->id(),from,to,etherType,0,field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD,payloadLen),payloadLen);
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP);
} else {
TRACE("dropped EXT_FRAME from %s(%s): we are not connected to network %.16llx",source().toString().c_str(),_remoteAddress.toString().c_str(),at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID));
}
} catch (std::exception &ex) {
TRACE("dropped EXT_FRAME from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped EXT_FRAME from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doMULTICAST_LIKE(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
const uint64_t now = RR->node->now();
// Iterate through 18-byte network,MAC,ADI tuples
for(unsigned int ptr=ZT_PACKET_IDX_PAYLOAD;ptr<size();ptr+=18)
RR->mc->add(now,at<uint64_t>(ptr),MulticastGroup(MAC(field(ptr + 8,6),6),at<uint32_t>(ptr + 14)),peer->address());
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_MULTICAST_LIKE,0,Packet::VERB_NOP);
} catch (std::exception &ex) {
TRACE("dropped MULTICAST_LIKE from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped MULTICAST_LIKE from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doNETWORK_MEMBERSHIP_CERTIFICATE(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
CertificateOfMembership com;
unsigned int ptr = ZT_PACKET_IDX_PAYLOAD;
while (ptr < size()) {
ptr += com.deserialize(*this,ptr);
if (com.hasRequiredFields()) {
SharedPtr<Network> network(RR->node->network(com.networkId()));
if (network)
network->addMembershipCertificate(com,false);
}
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_NETWORK_MEMBERSHIP_CERTIFICATE,0,Packet::VERB_NOP);
} catch (std::exception &ex) {
TRACE("dropped NETWORK_MEMBERSHIP_CERTIFICATE from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped NETWORK_MEMBERSHIP_CERTIFICATE from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doNETWORK_CONFIG_REQUEST(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_NETWORK_ID);
const unsigned int metaDataLength = at<uint16_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT_LEN);
const Dictionary metaData((const char *)field(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT,metaDataLength),metaDataLength);
const uint64_t haveRevision = ((ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT + metaDataLength + 8) <= size()) ? at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT + metaDataLength) : 0ULL;
const unsigned int h = hops();
const uint64_t pid = packetId();
peer->received(RR,_remoteAddress,_linkDesperation,h,pid,Packet::VERB_NETWORK_CONFIG_REQUEST,0,Packet::VERB_NOP);
if (RR->localNetworkController) {
Dictionary netconf;
switch(RR->localNetworkController->doNetworkConfigRequest((h > 0) ? InetAddress() : _remoteAddress,RR->identity,peer->identity(),nwid,metaData,haveRevision,netconf)) {
case NetworkController::NETCONF_QUERY_OK: {
const std::string netconfStr(netconf.toString());
if (netconfStr.length() > 0xffff) { // sanity check since field ix 16-bit
TRACE("NETWORK_CONFIG_REQUEST failed: internal error: netconf size %u is too large",(unsigned int)netconfStr.length());
} else {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK);
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append(pid);
outp.append(nwid);
outp.append((uint16_t)netconfStr.length());
outp.append(netconfStr.data(),netconfStr.length());
outp.compress();
if (outp.size() > ZT_PROTO_MAX_PACKET_LENGTH) {
TRACE("NETWORK_CONFIG_REQUEST failed: internal error: netconf size %u is too large",(unsigned int)netconfStr.length());
} else {
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
}
} break;
case NetworkController::NETCONF_QUERY_OK_BUT_NOT_NEWER: // nothing to do -- netconf has not changed
break;
case NetworkController::NETCONF_QUERY_OBJECT_NOT_FOUND: {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append(pid);
outp.append((unsigned char)Packet::ERROR_OBJ_NOT_FOUND);
outp.append(nwid);
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
} break;
case NetworkController::NETCONF_QUERY_ACCESS_DENIED: {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append(pid);
outp.append((unsigned char)Packet::ERROR_NETWORK_ACCESS_DENIED_);
outp.append(nwid);
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
} break;
case NetworkController::NETCONF_QUERY_INTERNAL_SERVER_ERROR:
TRACE("NETWORK_CONFIG_REQUEST failed: internal error: %s",netconf.get("error","(unknown)").c_str());
break;
default:
TRACE("NETWORK_CONFIG_REQUEST failed: invalid return value from NetworkController::doNetworkConfigRequest()");
break;
}
} else {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append(pid);
outp.append((unsigned char)Packet::ERROR_UNSUPPORTED_OPERATION);
outp.append(nwid);
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
} catch (std::exception &exc) {
TRACE("dropped NETWORK_CONFIG_REQUEST from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),exc.what());
} catch ( ... ) {
TRACE("dropped NETWORK_CONFIG_REQUEST from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doNETWORK_CONFIG_REFRESH(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
unsigned int ptr = ZT_PACKET_IDX_PAYLOAD;
while ((ptr + 8) <= size()) {
uint64_t nwid = at<uint64_t>(ptr);
SharedPtr<Network> nw(RR->node->network(nwid));
if ((nw)&&(peer->address() == nw->controller()))
nw->requestConfiguration();
ptr += 8;
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_NETWORK_CONFIG_REFRESH,0,Packet::VERB_NOP);
} catch (std::exception &exc) {
TRACE("dropped NETWORK_CONFIG_REFRESH from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),exc.what());
} catch ( ... ) {
TRACE("dropped NETWORK_CONFIG_REFRESH from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doMULTICAST_GATHER(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_NETWORK_ID);
const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_MAC,6),6),at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_ADI));
const unsigned int gatherLimit = at<uint32_t>(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_GATHER_LIMIT);
//TRACE("<<MC %s(%s) GATHER up to %u in %.16llx/%s",source().toString().c_str(),_remoteAddress.toString().c_str(),gatherLimit,nwid,mg.toString().c_str());
if (gatherLimit) {
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK);
outp.append((unsigned char)Packet::VERB_MULTICAST_GATHER);
outp.append(packetId());
outp.append(nwid);
mg.mac().appendTo(outp);
outp.append((uint32_t)mg.adi());
if (RR->mc->gather(peer->address(),nwid,mg,outp,gatherLimit)) {
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
}
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_MULTICAST_GATHER,0,Packet::VERB_NOP);
} catch (std::exception &exc) {
TRACE("dropped MULTICAST_GATHER from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),exc.what());
} catch ( ... ) {
TRACE("dropped MULTICAST_GATHER from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
bool IncomingPacket::_doMULTICAST_FRAME(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer)
{
try {
const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_NETWORK_ID);
const unsigned int flags = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FLAGS];
const SharedPtr<Network> network(RR->node->network(nwid));
if (network) {
// Offset -- size of optional fields added to position of later fields
unsigned int offset = 0;
if ((flags & 0x01) != 0) {
CertificateOfMembership com;
offset += com.deserialize(*this,ZT_PROTO_VERB_MULTICAST_FRAME_IDX_COM);
if (com.hasRequiredFields())
network->addMembershipCertificate(com,false);
}
// Check membership after we've read any included COM, since
// that cert might be what we needed.
if (!network->isAllowed(peer->address())) {
TRACE("dropped MULTICAST_FRAME from %s(%s): not a member of private network %.16llx",peer->address().toString().c_str(),_remoteAddress.toString().c_str(),(unsigned long long)network->id());
_sendErrorNeedCertificate(RR,peer,network->id());
return true;
}
unsigned int gatherLimit = 0;
if ((flags & 0x02) != 0) {
gatherLimit = at<uint32_t>(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_GATHER_LIMIT);
offset += 4;
}
MAC from;
if ((flags & 0x04) != 0) {
from.setTo(field(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SOURCE_MAC,6),6);
offset += 6;
} else {
from.fromAddress(peer->address(),nwid);
}
const MulticastGroup to(MAC(field(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DEST_MAC,6),6),at<uint32_t>(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DEST_ADI));
const unsigned int etherType = at<uint16_t>(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ETHERTYPE);
const unsigned int payloadLen = size() - (offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME);
//TRACE("<<MC FRAME %.16llx/%s from %s@%s flags %.2x length %u",nwid,to.toString().c_str(),from.toString().c_str(),peer->address().toString().c_str(),flags,payloadLen);
if ((payloadLen > 0)&&(payloadLen <= ZT_IF_MTU)) {
if (!to.mac().isMulticast()) {
TRACE("dropped MULTICAST_FRAME from %s@%s(%s) to %s: destination is unicast, must use FRAME or EXT_FRAME",from.toString().c_str(),peer->address().toString().c_str(),_remoteAddress.toString().c_str(),to.toString().c_str());
return true;
}
if ((!from)||(from.isMulticast())||(from == network->mac())) {
TRACE("dropped MULTICAST_FRAME from %s@%s(%s) to %s: invalid source MAC",from.toString().c_str(),peer->address().toString().c_str(),_remoteAddress.toString().c_str(),to.toString().c_str());
return true;
}
if (from != MAC(peer->address(),network->id())) {
if (network->permitsBridging(peer->address())) {
network->learnBridgeRoute(from,peer->address());
} else {
TRACE("dropped MULTICAST_FRAME from %s@%s(%s) to %s: sender not allowed to bridge into %.16llx",from.toString().c_str(),peer->address().toString().c_str(),_remoteAddress.toString().c_str(),to.toString().c_str(),network->id());
return true;
}
}
RR->node->putFrame(network->id(),from,to.mac(),etherType,0,field(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME,payloadLen),payloadLen);
}
if (gatherLimit) {
Packet outp(source(),RR->identity.address(),Packet::VERB_OK);
outp.append((unsigned char)Packet::VERB_MULTICAST_FRAME);
outp.append(packetId());
outp.append(nwid);
to.mac().appendTo(outp);
outp.append((uint32_t)to.adi());
outp.append((unsigned char)0x02); // flag 0x02 = contains gather results
if (RR->mc->gather(peer->address(),nwid,to,outp,gatherLimit)) {
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
}
} // else ignore -- not a member of this network
peer->received(RR,_remoteAddress,_linkDesperation,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP);
} catch (std::exception &exc) {
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),exc.what());
} catch ( ... ) {
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
}
return true;
}
void IncomingPacket::_sendErrorNeedCertificate(const RuntimeEnvironment *RR,const SharedPtr<Peer> &peer,uint64_t nwid)
{
Packet outp(source(),RR->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)verb());
outp.append(packetId());
outp.append((unsigned char)Packet::ERROR_NEED_MEMBERSHIP_CERTIFICATE);
outp.append(nwid);
outp.armor(peer->key(),true);
RR->node->putPacket(_remoteAddress,outp.data(),outp.size(),_linkDesperation);
}
} // namespace ZeroTier
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