mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 13:07:55 +00:00
b6248c7cb7
In addition to a lot of Windows port work that isn't finished yet (and doesn't affect the *nix platforms at all), this version contains quite a bit of multicast cleanup and code simplification. I also pulled rate limits for now, as it seems to be causing problems. More testing on the testnet is going to be needed.
676 lines
30 KiB
C++
676 lines
30 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 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 "RuntimeEnvironment.hpp"
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#include "Topology.hpp"
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#include "PacketDecoder.hpp"
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#include "Switch.hpp"
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#include "Peer.hpp"
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#include "NodeConfig.hpp"
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#include "Filter.hpp"
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#include "Service.hpp"
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/*
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* The big picture:
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*
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* tryDecode() gets called for a given fully-assembled packet until it returns
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* true or the packet's time to live has been exceeded. The state machine must
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* therefore be re-entrant if it ever returns false. Take care here!
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*
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* Stylistic note:
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*
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* There's a lot of unnecessary if nesting. It's mostly to allow TRACE to
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* print informative messages on every possible reason something gets
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* rejected or fails.
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*/
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namespace ZeroTier {
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bool PacketDecoder::tryDecode(const RuntimeEnvironment *_r)
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throw(std::out_of_range,std::runtime_error)
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{
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if ((!encrypted())&&(verb() == Packet::VERB_HELLO)) {
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// Unencrypted HELLOs are handled here since they are used to
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// populate our identity cache in the first place. Thus we might get
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// a HELLO for someone for whom we don't have a Peer record.
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TRACE("HELLO from %s(%s)",source().toString().c_str(),_remoteAddress.toString().c_str());
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return _doHELLO(_r);
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}
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SharedPtr<Peer> peer = _r->topology->getPeer(source());
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if (peer) {
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// Resume saved state?
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if (_step == DECODE_WAITING_FOR_MULTICAST_FRAME_ORIGINAL_SENDER_LOOKUP) {
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// In this state we have already authenticated and decrypted the
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// packet and are waiting for the lookup of the original sender
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// for a multicast frame. So check to see if we've got it.
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return _doMULTICAST_FRAME(_r,peer);
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}
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// No saved state? Verify MAC before we proceed.
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if (!hmacVerify(peer->macKey())) {
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TRACE("dropped packet from %s(%s), HMAC authentication failed (size: %u)",source().toString().c_str(),_remoteAddress.toString().c_str(),size());
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return true;
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}
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// If MAC authentication passed, decrypt and uncompress
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if (encrypted()) {
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decrypt(peer->cryptKey());
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} else {
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// Unencrypted is tolerated in case we want to run this on
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// devices where squeezing out cycles matters. HMAC is
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// what's really important. But log it in debug to catch any
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// packets being mistakenly sent in the clear.
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TRACE("ODD: %s from %s(%s) wasn't encrypted",Packet::verbString(verb()),source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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if (!uncompress()) {
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TRACE("dropped packet from %s(%s), compressed data invalid",source().toString().c_str(),_remoteAddress.toString().c_str());
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return true;
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}
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Packet::Verb v = verb();
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// Once a packet is determined to be basically valid, it can be used
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// to passively learn a new network path to the sending peer. It
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// also results in statistics updates.
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peer->onReceive(_r,_localPort,_remoteAddress,hops(),v,Utils::now());
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switch(v) {
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case Packet::VERB_NOP:
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TRACE("NOP from %s(%s)",source().toString().c_str(),_remoteAddress.toString().c_str());
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return true;
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case Packet::VERB_HELLO:
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return _doHELLO(_r);
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case Packet::VERB_ERROR:
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return _doERROR(_r,peer);
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case Packet::VERB_OK:
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return _doOK(_r,peer);
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case Packet::VERB_WHOIS:
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return _doWHOIS(_r,peer);
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case Packet::VERB_RENDEZVOUS:
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return _doRENDEZVOUS(_r,peer);
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case Packet::VERB_FRAME:
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return _doFRAME(_r,peer);
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case Packet::VERB_MULTICAST_LIKE:
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return _doMULTICAST_LIKE(_r,peer);
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case Packet::VERB_MULTICAST_FRAME:
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return _doMULTICAST_FRAME(_r,peer);
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case Packet::VERB_NETWORK_MEMBERSHIP_CERTIFICATE:
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return _doNETWORK_MEMBERSHIP_CERTIFICATE(_r,peer);
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case Packet::VERB_NETWORK_CONFIG_REQUEST:
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return _doNETWORK_CONFIG_REQUEST(_r,peer);
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case Packet::VERB_NETWORK_CONFIG_REFRESH:
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return _doNETWORK_CONFIG_REFRESH(_r,peer);
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default:
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// This might be something from a new or old version of the protocol.
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// Technically it passed HMAC so the packet is still valid, but we
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// ignore it.
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TRACE("ignored unrecognized verb %.2x from %s(%s)",(unsigned int)v,source().toString().c_str(),_remoteAddress.toString().c_str());
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return true;
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}
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} else {
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_step = DECODE_WAITING_FOR_SENDER_LOOKUP; // should already be this...
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_r->sw->requestWhois(source());
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return false;
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}
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}
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void PacketDecoder::_CBaddPeerFromHello(void *arg,const SharedPtr<Peer> &p,Topology::PeerVerifyResult result)
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{
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_CBaddPeerFromHello_Data *req = (_CBaddPeerFromHello_Data *)arg;
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const RuntimeEnvironment *_r = req->renv;
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try {
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switch(result) {
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case Topology::PEER_VERIFY_ACCEPTED_NEW:
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case Topology::PEER_VERIFY_ACCEPTED_ALREADY_HAVE:
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case Topology::PEER_VERIFY_ACCEPTED_DISPLACED_INVALID_ADDRESS: {
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_r->sw->doAnythingWaitingForPeer(p);
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Packet outp(req->source,_r->identity.address(),Packet::VERB_OK);
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outp.append((unsigned char)Packet::VERB_HELLO);
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outp.append(req->helloPacketId);
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outp.append(req->helloTimestamp);
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outp.encrypt(p->cryptKey());
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outp.hmacSet(p->macKey());
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_r->demarc->send(req->localPort,req->remoteAddress,outp.data(),outp.size(),-1);
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} break;
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case Topology::PEER_VERIFY_REJECTED_INVALID_IDENTITY: {
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Packet outp(req->source,_r->identity.address(),Packet::VERB_ERROR);
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outp.append((unsigned char)Packet::VERB_HELLO);
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outp.append(req->helloPacketId);
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outp.append((unsigned char)Packet::ERROR_IDENTITY_INVALID);
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outp.encrypt(p->cryptKey());
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outp.hmacSet(p->macKey());
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_r->demarc->send(req->localPort,req->remoteAddress,outp.data(),outp.size(),-1);
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} break;
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case Topology::PEER_VERIFY_REJECTED_DUPLICATE:
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case Topology::PEER_VERIFY_REJECTED_DUPLICATE_TRIAGED: {
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Packet outp(req->source,_r->identity.address(),Packet::VERB_ERROR);
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outp.append((unsigned char)Packet::VERB_HELLO);
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outp.append(req->helloPacketId);
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outp.append((unsigned char)Packet::ERROR_IDENTITY_COLLISION);
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outp.encrypt(p->cryptKey());
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outp.hmacSet(p->macKey());
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_r->demarc->send(req->localPort,req->remoteAddress,outp.data(),outp.size(),-1);
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} break;
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}
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} catch ( ... ) {
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TRACE("unexpected exception in addPeer() result callback for peer received via HELLO");
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}
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delete req;
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}
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void PacketDecoder::_CBaddPeerFromWhois(void *arg,const SharedPtr<Peer> &p,Topology::PeerVerifyResult result)
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{
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const RuntimeEnvironment *_r = (const RuntimeEnvironment *)arg;
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try {
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switch(result) {
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case Topology::PEER_VERIFY_ACCEPTED_NEW:
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case Topology::PEER_VERIFY_ACCEPTED_ALREADY_HAVE:
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case Topology::PEER_VERIFY_ACCEPTED_DISPLACED_INVALID_ADDRESS:
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_r->sw->doAnythingWaitingForPeer(p);
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break;
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default:
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break;
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}
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} catch ( ... ) {
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TRACE("unexpected exception in addPeer() result callback for peer received via OK(WHOIS)");
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}
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}
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bool PacketDecoder::_doERROR(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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#ifdef ZT_TRACE
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Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_ERROR_IDX_IN_RE_VERB];
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Packet::ErrorCode errorCode = (Packet::ErrorCode)(*this)[ZT_PROTO_VERB_ERROR_IDX_ERROR_CODE];
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TRACE("ERROR %s from %s(%s) in-re %s",Packet::errorString(errorCode),source().toString().c_str(),_remoteAddress.toString().c_str(),Packet::verbString(inReVerb));
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#endif
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// TODO (sorta):
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// The fact is that the protocol works fine without error handling.
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// The only error that really needs to be handled here is duplicate
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// identity collision, which if it comes from a supernode should cause
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// us to restart and regenerate a new identity.
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} catch (std::exception &ex) {
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TRACE("dropped ERROR from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped ERROR from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doHELLO(const RuntimeEnvironment *_r)
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{
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try {
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//unsigned int protoVersion = (*this)[ZT_PROTO_VERB_HELLO_IDX_PROTOCOL_VERSION];
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unsigned int vMajor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MAJOR_VERSION];
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unsigned int vMinor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MINOR_VERSION];
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unsigned int vRevision = at<uint16_t>(ZT_PROTO_VERB_HELLO_IDX_REVISION);
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uint64_t timestamp = at<uint64_t>(ZT_PROTO_VERB_HELLO_IDX_TIMESTAMP);
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Identity id(*this,ZT_PROTO_VERB_HELLO_IDX_IDENTITY);
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// Initial sniff test for valid addressing and that this is indeed the
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// submitter's identity.
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if ((id.address().isReserved())||(id.address() != source())) {
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#ifdef ZT_TRACE
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if (id.address().isReserved()) {
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TRACE("dropped HELLO from %s(%s): identity has reserved address",source().toString().c_str(),_remoteAddress.toString().c_str());
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} else {
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TRACE("dropped HELLO from %s(%s): identity is not for sender of packet (HELLO is a self-announcement)",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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#endif
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return true;
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}
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// Is this a HELLO for a peer we already know? If so just update its
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// packet receive stats and send an OK.
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SharedPtr<Peer> existingPeer(_r->topology->getPeer(id.address()));
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if ((existingPeer)&&(existingPeer->identity() == id)) {
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existingPeer->onReceive(_r,_localPort,_remoteAddress,hops(),Packet::VERB_HELLO,Utils::now());
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existingPeer->setRemoteVersion(vMajor,vMinor,vRevision);
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Packet outp(source(),_r->identity.address(),Packet::VERB_OK);
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outp.append((unsigned char)Packet::VERB_HELLO);
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outp.append(packetId());
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outp.append(timestamp);
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outp.encrypt(existingPeer->cryptKey());
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outp.hmacSet(existingPeer->macKey());
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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return true;
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}
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SharedPtr<Peer> candidate(new Peer(_r->identity,id));
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candidate->setPathAddress(_remoteAddress,false);
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_CBaddPeerFromHello_Data *arg = new _CBaddPeerFromHello_Data;
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arg->renv = _r;
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arg->source = source();
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arg->remoteAddress = _remoteAddress;
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arg->localPort = _localPort;
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arg->vMajor = vMajor;
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arg->vMinor = vMinor;
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arg->vRevision = vRevision;
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arg->helloPacketId = packetId();
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arg->helloTimestamp = timestamp;
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_r->topology->addPeer(candidate,&PacketDecoder::_CBaddPeerFromHello,arg);
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} catch (std::exception &ex) {
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TRACE("dropped HELLO from %s(%s): %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped HELLO from %s(%s): unexpected exception",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doOK(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_OK_IDX_IN_RE_VERB];
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switch(inReVerb) {
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case Packet::VERB_HELLO: {
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// OK from HELLO permits computation of latency.
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unsigned int latency = std::min((unsigned int)(Utils::now() - at<uint64_t>(ZT_PROTO_VERB_HELLO__OK__IDX_TIMESTAMP)),(unsigned int)0xffff);
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TRACE("%s(%s): OK(HELLO), latency: %u",source().toString().c_str(),_remoteAddress.toString().c_str(),latency);
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peer->setLatency(_remoteAddress,latency);
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} break;
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case Packet::VERB_WHOIS: {
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TRACE("%s(%s): OK(%s)",source().toString().c_str(),_remoteAddress.toString().c_str(),Packet::verbString(inReVerb));
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if (_r->topology->isSupernode(source())) {
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// Right now, only supernodes are queried for WHOIS so we only
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// accept OK(WHOIS) from supernodes. Otherwise peers could
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// potentially cache-poison.
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_r->topology->addPeer(SharedPtr<Peer>(new Peer(_r->identity,Identity(*this,ZT_PROTO_VERB_WHOIS__OK__IDX_IDENTITY))),&PacketDecoder::_CBaddPeerFromWhois,const_cast<void *>((const void *)_r));
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}
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} break;
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case Packet::VERB_NETWORK_CONFIG_REQUEST: {
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SharedPtr<Network> nw(_r->nc->network(at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_NETWORK_ID)));
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if ((nw)&&(nw->controller() == source())) {
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// OK(NETWORK_CONFIG_REQUEST) is only accepted from a network's
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// controller.
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unsigned int dictlen = at<uint16_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_DICT_LEN);
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std::string dict((const char *)field(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_DICT,dictlen),dictlen);
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if (dict.length()) {
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Network::Config netconf(dict);
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if ((netconf.networkId() == nw->id())&&(netconf.peerAddress() == _r->identity.address())) { // sanity check
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LOG("got network configuration for network %.16llx from %s",(unsigned long long)nw->id(),source().toString().c_str());
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nw->setConfiguration(netconf);
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}
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}
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}
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} break;
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default:
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//TRACE("%s(%s): OK(%s)",source().toString().c_str(),_remoteAddress.toString().c_str(),Packet::verbString(inReVerb));
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break;
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}
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} catch (std::exception &ex) {
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TRACE("dropped OK from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped OK from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doWHOIS(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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if (payloadLength() == ZT_ADDRESS_LENGTH) {
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SharedPtr<Peer> p(_r->topology->getPeer(Address(payload(),ZT_ADDRESS_LENGTH)));
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if (p) {
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Packet outp(source(),_r->identity.address(),Packet::VERB_OK);
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outp.append((unsigned char)Packet::VERB_WHOIS);
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outp.append(packetId());
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p->identity().serialize(outp,false);
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outp.encrypt(peer->cryptKey());
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outp.hmacSet(peer->macKey());
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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TRACE("sent WHOIS response to %s for %s",source().toString().c_str(),Address(payload(),ZT_ADDRESS_LENGTH).toString().c_str());
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} else {
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Packet outp(source(),_r->identity.address(),Packet::VERB_ERROR);
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outp.append((unsigned char)Packet::VERB_WHOIS);
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outp.append(packetId());
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outp.append((unsigned char)Packet::ERROR_OBJ_NOT_FOUND);
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outp.append(payload(),ZT_ADDRESS_LENGTH);
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outp.encrypt(peer->cryptKey());
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outp.hmacSet(peer->macKey());
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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TRACE("sent WHOIS ERROR to %s for %s (not found)",source().toString().c_str(),Address(payload(),ZT_ADDRESS_LENGTH).toString().c_str());
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}
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} else {
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TRACE("dropped WHOIS from %s(%s): missing or invalid address",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doRENDEZVOUS(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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/*
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* At the moment, we only obey RENDEZVOUS if it comes from a designated
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* supernode. If relay offloading is implemented to scale the net, this
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* will need reconsideration.
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*
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* The reason is that RENDEZVOUS could technically be used to cause a
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* peer to send a weird encrypted UDP packet to an arbitrary IP:port.
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* The sender of RENDEZVOUS has no control over the content of this
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* packet, but it's still maybe something we want to not allow just
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* anyone to order due to possible DDOS or network forensic implications.
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* So if we diversify relays, we'll need some way of deciding whether the
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* sender is someone we should trust with a RENDEZVOUS hint.
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*/
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if (_r->topology->isSupernode(source())) {
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Address with(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ZTADDRESS,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
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SharedPtr<Peer> withPeer(_r->topology->getPeer(with));
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if (withPeer) {
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unsigned int port = at<uint16_t>(ZT_PROTO_VERB_RENDEZVOUS_IDX_PORT);
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unsigned int addrlen = (*this)[ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRLEN];
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if ((port > 0)&&((addrlen == 4)||(addrlen == 16))) {
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InetAddress atAddr(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRESS,addrlen),addrlen,port);
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TRACE("RENDEZVOUS from %s says %s might be at %s, starting NAT-t",source().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
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|
_r->sw->contact(withPeer,atAddr);
|
|
} else {
|
|
TRACE("dropped corrupt RENDEZVOUS from %s(%s) (bad address or port)",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
} else {
|
|
TRACE("ignored RENDEZVOUS from %s(%s) to meet unknown peer %s",source().toString().c_str(),_remoteAddress.toString().c_str(),with.toString().c_str());
|
|
}
|
|
} else {
|
|
TRACE("ignored RENDEZVOUS from %s(%s): source not supernode",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
} catch (std::exception &ex) {
|
|
TRACE("dropped RENDEZVOUS from %s(%s): %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
|
|
} catch ( ... ) {
|
|
TRACE("dropped RENDEZVOUS from %s(%s): unexpected exception",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool PacketDecoder::_doFRAME(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
SharedPtr<Network> network(_r->nc->network(at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID)));
|
|
if (network) {
|
|
if (network->isAllowed(source())) {
|
|
unsigned int etherType = at<uint16_t>(ZT_PROTO_VERB_FRAME_IDX_ETHERTYPE);
|
|
if ((etherType != ZT_ETHERTYPE_ARP)&&(etherType != ZT_ETHERTYPE_IPV4)&&(etherType != ZT_ETHERTYPE_IPV6)) {
|
|
TRACE("dropped FRAME from %s: unsupported ethertype",source().toString().c_str());
|
|
} else if (size() > ZT_PROTO_VERB_FRAME_IDX_PAYLOAD) {
|
|
network->tap().put(source().toMAC(),network->tap().mac(),etherType,data() + ZT_PROTO_VERB_FRAME_IDX_PAYLOAD,size() - ZT_PROTO_VERB_FRAME_IDX_PAYLOAD);
|
|
}
|
|
} else {
|
|
TRACE("dropped FRAME from %s(%s): not a member of closed network %llu",source().toString().c_str(),_remoteAddress.toString().c_str(),network->id());
|
|
}
|
|
} else {
|
|
TRACE("dropped FRAME from %s(%s): network %llu unknown",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 PacketDecoder::_doMULTICAST_LIKE(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
unsigned int ptr = ZT_PACKET_IDX_PAYLOAD;
|
|
unsigned int numAccepted = 0;
|
|
uint64_t now = Utils::now();
|
|
|
|
// Iterate through 18-byte network,MAC,ADI tuples:
|
|
while ((ptr + 18) <= size()) {
|
|
uint64_t nwid = at<uint64_t>(ptr); ptr += 8;
|
|
SharedPtr<Network> network(_r->nc->network(nwid));
|
|
if ((network)&&(network->isAllowed(source()))) {
|
|
MAC mac(field(ptr,6)); ptr += 6;
|
|
uint32_t adi = at<uint32_t>(ptr); ptr += 4;
|
|
//TRACE("peer %s likes multicast group %s:%.8lx on network %llu",source().toString().c_str(),mac.toString().c_str(),(unsigned long)adi,nwid);
|
|
_r->multicaster->likesMulticastGroup(nwid,MulticastGroup(mac,adi),source(),now);
|
|
++numAccepted;
|
|
} else ptr += 10;
|
|
}
|
|
|
|
Packet outp(source(),_r->identity.address(),Packet::VERB_OK);
|
|
outp.append((unsigned char)Packet::VERB_MULTICAST_LIKE);
|
|
outp.append(packetId());
|
|
outp.append((uint16_t)numAccepted);
|
|
outp.encrypt(peer->cryptKey());
|
|
outp.hmacSet(peer->macKey());
|
|
_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
|
|
} 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 PacketDecoder::_doMULTICAST_FRAME(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
SharedPtr<Network> network(_r->nc->network(at<uint64_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_NETWORK_ID)));
|
|
if ((network)&&(network->isAllowed(source()))) {
|
|
Address originalSubmitterAddress(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SUBMITTER_ADDRESS,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
|
|
|
|
if (originalSubmitterAddress.isReserved()) {
|
|
TRACE("dropped MULTICAST_FRAME from original submitter %s, received from %s(%s): invalid original submitter address",originalSubmitterAddress.toString().c_str(),source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
if (originalSubmitterAddress == _r->identity.address()) {
|
|
TRACE("dropped MULTICAST_FRAME from original submitter %s, received from %s(%s): boomerang!",originalSubmitterAddress.toString().c_str(),source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
|
|
SharedPtr<Peer> originalSubmitter(_r->topology->getPeer(originalSubmitterAddress));
|
|
if (!originalSubmitter) {
|
|
TRACE("requesting WHOIS on original multicast frame submitter %s",originalSubmitterAddress.toString().c_str());
|
|
_r->sw->requestWhois(originalSubmitterAddress);
|
|
_step = DECODE_WAITING_FOR_MULTICAST_FRAME_ORIGINAL_SENDER_LOOKUP;
|
|
return false; // try again if/when we get OK(WHOIS)
|
|
}
|
|
|
|
MAC fromMac(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SOURCE_MAC,6));
|
|
MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DESTINATION_MAC,6)),at<uint32_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ADI));
|
|
unsigned int hops = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_HOP_COUNT];
|
|
unsigned int etherType = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ETHERTYPE);
|
|
unsigned int datalen = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PAYLOAD_LENGTH);
|
|
unsigned int signaturelen = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SIGNATURE_LENGTH);
|
|
unsigned char *dataAndSignature = field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PAYLOAD,datalen + signaturelen);
|
|
|
|
if (!Multicaster::verifyMulticastPacket(originalSubmitter->identity(),network->id(),fromMac,mg,etherType,dataAndSignature,datalen,dataAndSignature + datalen,signaturelen)) {
|
|
LOG("dropped MULTICAST_FRAME from original submitter %s, received from %s(%s): FAILED SIGNATURE CHECK (spoofed original submitter?)",originalSubmitterAddress.toString().c_str(),source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
|
|
if (++hops >= ZT_MULTICAST_PROPAGATION_DEPTH) {
|
|
TRACE("dropped MULTICAST_FRAME from original submitter %s, received from %s(%s): max depth reached",originalSubmitterAddress.toString().c_str(),source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
|
|
uint64_t mccrc = Multicaster::computeMulticastDedupCrc(network->id(),fromMac,mg,etherType,dataAndSignature,datalen);
|
|
uint64_t now = Utils::now();
|
|
bool isDuplicate = _r->multicaster->checkDuplicate(mccrc,now);
|
|
|
|
if (!isDuplicate) {
|
|
//if (network->multicastRateGate(originalSubmitterAddress,datalen)) {
|
|
network->tap().put(fromMac,mg.mac(),etherType,dataAndSignature,datalen);
|
|
//} else {
|
|
// TRACE("dropped MULTICAST_FRAME from original submitter %s, received from %s(%s): sender rate limit exceeded",originalSubmitterAddress.toString().c_str(),source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
// return true;
|
|
//}
|
|
|
|
/* It's important that we do this *after* rate limit checking,
|
|
* otherwise supernodes could be used to execute a flood by
|
|
* first bouncing a multicast off a supernode and then flooding
|
|
* it with retransmits. */
|
|
_r->multicaster->addToDedupHistory(mccrc,now);
|
|
}
|
|
|
|
Address upstream(source()); // save this since we might mangle it below
|
|
Multicaster::MulticastBloomFilter bloom(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_BLOOM_FILTER,ZT_PROTO_VERB_MULTICAST_FRAME_BLOOM_FILTER_SIZE_BYTES));
|
|
SharedPtr<Peer> propPeers[ZT_MULTICAST_PROPAGATION_BREADTH];
|
|
unsigned int np = 0;
|
|
|
|
if (_r->topology->amSupernode()) {
|
|
/* Supernodes behave differently here from ordinary nodes, as their
|
|
* role in the network is to bridge gaps between unconnected islands
|
|
* in a multicast propagation graph. Instead of using the ordinary
|
|
* multicast peer picker, supernodes propagate to random unvisited
|
|
* peers. They will also repeatedly propagate duplicate multicasts to
|
|
* new peers, while regular nodes simply discard them. This allows
|
|
* such gaps to be bridged more than once by ping-ponging off the
|
|
* same supernode -- a simple way to implement this without requiring
|
|
* that supernodes maintain a lot of state at the cost of a small
|
|
* amount of bandwidth. */
|
|
np = _r->multicaster->pickRandomPropagationPeers(
|
|
*(_r->prng),
|
|
*(_r->topology),
|
|
network->id(),
|
|
mg,
|
|
originalSubmitterAddress,
|
|
upstream,
|
|
bloom,
|
|
ZT_MULTICAST_PROPAGATION_BREADTH,
|
|
propPeers,
|
|
now);
|
|
} else if (isDuplicate) {
|
|
TRACE("dropped MULTICAST_FRAME from original submitter %s, received from %s(%s): duplicate",originalSubmitterAddress.toString().c_str(),source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
} else {
|
|
/* Regular peers only propagate non-duplicate packets, and do so
|
|
* according to ordinary propagation priority rules. */
|
|
np = _r->multicaster->pickSocialPropagationPeers(
|
|
*(_r->prng),
|
|
*(_r->topology),
|
|
network->id(),
|
|
mg,
|
|
originalSubmitterAddress,
|
|
upstream,
|
|
bloom,
|
|
ZT_MULTICAST_PROPAGATION_BREADTH,
|
|
propPeers,
|
|
now);
|
|
}
|
|
|
|
/* Re-use *this* packet to repeat it to our propagation
|
|
* recipients, which invalidates its current contents and
|
|
* state. */
|
|
|
|
if (np) {
|
|
setSource(_r->identity.address());
|
|
(*this)[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_HOP_COUNT] = hops;
|
|
memcpy(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_BLOOM_FILTER,ZT_PROTO_VERB_MULTICAST_FRAME_BLOOM_FILTER_SIZE_BYTES),bloom.data(),ZT_PROTO_VERB_MULTICAST_FRAME_BLOOM_FILTER_SIZE_BYTES);
|
|
compress();
|
|
for(unsigned int i=0;i<np;++i) {
|
|
newInitializationVector();
|
|
setDestination(propPeers[i]->address());
|
|
_r->sw->send(*this,true);
|
|
}
|
|
}
|
|
|
|
/* Just to be safe, return true here to terminate processing as we
|
|
* have thoroughly destroyed our state by doing the above. */
|
|
return true;
|
|
} else {
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): network %.16llx unknown or sender not allowed",source().toString().c_str(),_remoteAddress.toString().c_str(),(unsigned long long)network->id());
|
|
}
|
|
} catch (std::exception &ex) {
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
|
|
} catch ( ... ) {
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool PacketDecoder::_doNETWORK_MEMBERSHIP_CERTIFICATE(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
// TODO: not implemented yet, will be needed for private networks.
|
|
|
|
return true;
|
|
}
|
|
|
|
bool PacketDecoder::_doNETWORK_CONFIG_REQUEST(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_NETWORK_ID);
|
|
#ifndef __WINDOWS__
|
|
if (_r->netconfService) {
|
|
char tmp[128];
|
|
unsigned int dictLen = at<uint16_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT_LEN);
|
|
|
|
Dictionary request;
|
|
if (dictLen)
|
|
request["meta"] = std::string((const char *)field(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT,dictLen),dictLen);
|
|
request["type"] = "netconf-request";
|
|
request["peerId"] = peer->identity().toString(false);
|
|
sprintf(tmp,"%llx",(unsigned long long)nwid);
|
|
request["nwid"] = tmp;
|
|
sprintf(tmp,"%llx",(unsigned long long)packetId());
|
|
request["requestId"] = tmp;
|
|
//TRACE("to netconf:\n%s",request.toString().c_str());
|
|
_r->netconfService->send(request);
|
|
} else {
|
|
#endif // !__WINDOWS__
|
|
Packet outp(source(),_r->identity.address(),Packet::VERB_ERROR);
|
|
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
|
|
outp.append(packetId());
|
|
outp.append((unsigned char)Packet::ERROR_UNSUPPORTED_OPERATION);
|
|
outp.append(nwid);
|
|
outp.encrypt(peer->cryptKey());
|
|
outp.hmacSet(peer->macKey());
|
|
_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
|
|
#ifndef __WINDOWS__
|
|
}
|
|
#endif // !__WINDOWS__
|
|
} 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 PacketDecoder::_doNETWORK_CONFIG_REFRESH(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REFRESH_IDX_NETWORK_ID);
|
|
SharedPtr<Network> nw(_r->nc->network(nwid));
|
|
if ((nw)&&(source() == nw->controller())) // only respond to requests from controller
|
|
nw->requestConfiguration();
|
|
} 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;
|
|
}
|
|
|
|
} // namespace ZeroTier
|