void FlowWriter::flush(PacketWriter& writer,UInt64 stage,UInt8 flags,bool header,BinaryReader& reader,UInt16 size) {
if(_stageAck==0 && header)
flags |= MESSAGE_HEADER;
if(size==0)
flags |= MESSAGE_ABANDONMENT;
if(_closed && _messages.size()==1) // On LAST message
flags |= MESSAGE_END;
// TRACE("FlowWriter %u stage %u",id,stage);
writer.write8(flags);
if(header) {
writer.write7BitLongValue(id);
writer.write7BitLongValue(stage);
writer.write7BitLongValue(stage-_stageAck);
// signature
if(_stageAck==0) {
writer.writeString8(signature);
// No write this in the case where it's a new flow!
if(flowId>0) {
writer.write8(1+Util::Get7BitValueSize(flowId)); // following size
writer.write8(0x0a); // Unknown!
writer.write7BitLongValue(flowId);
}
writer.write8(0); // marker of end for this part
}
}
if(size>0) {
reader.readRaw(writer.begin()+writer.position(),size);
writer.next(size);
}
}
// TODO make perhaps a FlowHandshake
UInt8 Handshake::handshakeHandler(UInt8 id,PacketReader& request,PacketWriter& response) {
switch(id){
case 0x30: {
request.read8(); // passer un caractere (boite dans boite)
UInt8 epdLen = request.read8()-1;
UInt8 type = request.read8();
string epd;
request.readRaw(epdLen,epd);
string tag;
request.readRaw(16,tag);
response.writeString8(tag);
// UDP hole punching
if(type == 0x0f)
return _gateway.p2pHandshake(tag,response,peer().address,(const UInt8*)epd.c_str());
if(type == 0x0a){
/// Handshake
// RESPONSE 38
// New Cookie
char cookie[65];
RandomInputStream ris;
ris.read(cookie,64);
cookie[64]='\0';
response.write8(64);
response.writeRaw(cookie,64);
_cookies[cookie] = new Cookie(epd);
// instance id (certificat in the middle)
response.writeRaw(_certificat,sizeof(_certificat));
return 0x70;
} else {
ERROR("Unkown handshake first way with '%02x' type",type);
}
break;
}
case 0x38: {
_farId = request.read32();
string cookie;
request.readRaw(request.read8(),cookie);
map<string,Cookie*>::iterator itCookie = _cookies.find(cookie.c_str());
if(itCookie==_cookies.end()) {
ERROR("Handshake cookie '%s' unknown",cookie.c_str());
return 0;
}
request.read8(); // why 0x81?
// signature
string farSignature;
request.readString8(farSignature); // 81 02 1D 02 stable
// farPubKeyPart
UInt8 farPubKeyPart[128];
request.readRaw((char*)farPubKeyPart,sizeof(farPubKeyPart));
string farCertificat;
request.readString8(farCertificat);
// peerId = SHA256(farSignature+farPubKey)
string temp(farSignature);
temp.append((char*)farPubKeyPart,sizeof(farPubKeyPart));
EVP_Digest(temp.c_str(),temp.size(),(UInt8*)peer().id,NULL,EVP_sha256(),NULL);
// Compute Diffie-Hellman secret
UInt8 pubKey[128];
UInt8 sharedSecret[128];
RTMFP::EndDiffieHellman(RTMFP::BeginDiffieHellman(pubKey),farPubKeyPart,sharedSecret);
// Compute Keys
UInt8 requestKey[AES_KEY_SIZE];
UInt8 responseKey[AES_KEY_SIZE];
RTMFP::ComputeAsymetricKeys(sharedSecret,pubKey,_signature,farCertificat,requestKey,responseKey);
// RESPONSE
Util::UnpackUrl(itCookie->second->queryUrl,(string&)peer().path,(map<string,string>&)peer().parameters);
response << _gateway.createSession(_farId,peer(),requestKey,responseKey);
response.write8(0x81);
response.writeString8(_signature);
response.writeRaw((char*)pubKey,sizeof(pubKey));
response.write8(0x58);
// remove cookie
_cookies.erase(itCookie);
// db_add_public(s); // TODO
return 0x78;
}
default:
ERROR("Unkown handshake packet id '%02x'",id);
}
return 0;
}
UInt8 Handshake::handshakeHandler(UInt8 id,PacketReader& request,PacketWriter& response) {
switch(id){
case 0x30: {
request.read8(); // passer un caractere (boite dans boite)
UInt8 epdLen = request.read8()-1;
UInt8 type = request.read8();
string epd;
request.readRaw(epdLen,epd);
string tag;
request.readRaw(16,tag);
response.writeString8(tag);
if(type == 0x0f)
return _gateway.p2pHandshake(tag,response,peer.address,(const UInt8*)epd.c_str());
if(type == 0x0a){
/// Handshake
HelloAttempt& attempt = helloAttempt<HelloAttempt>(tag);
if(edges().size()>0 && (_invoker.edgesAttemptsBeforeFallback==0 || attempt.count <_invoker.edgesAttemptsBeforeFallback)) {
if(_invoker.edgesAttemptsBeforeFallback>0) {
try {
URI uri(epd);
response.writeAddress(SocketAddress(uri.getHost(),uri.getPort()),false); // TODO check with true!
} catch(Exception& ex) {
ERROR("Parsing %s URL problem in hello attempt : %s",epd.c_str(),ex.displayText().c_str());
}
}
map<int,list<Edge*> > edgesSortedByCount;
map<string,Edge*>::const_iterator it;
for(it=edges().begin();it!=edges().end();++it)
edgesSortedByCount[it->second->count].push_back(it->second);
UInt8 count=0;
map<int,list<Edge*> >::const_iterator it2;
for(it2=edgesSortedByCount.begin();it2!=edgesSortedByCount.end();++it2) {
list<Edge*>::const_iterator it3;
for(it3=it2->second.begin();it3!=it2->second.end();++it3) {
response.writeAddress((*it3)->address,false);
if((++count)==6) // 6 redirections maximum
break;
}
if(it3!=it2->second.end())
break;
}
return 0x71;
}
if(edges().size()>0)
WARN("After %u hello attempts, impossible to connect to edges. Edges are busy? or unreachable?",_invoker.edgesAttemptsBeforeFallback);
// New Cookie
createCookie(response,attempt,tag,epd);
// instance id (certificat in the middle)
response.writeRaw(_certificat,sizeof(_certificat));
return 0x70;
} else
ERROR("Unkown handshake first way with '%02x' type",type);
break;
}
case 0x39:
case 0x38: {
(UInt32&)farId = request.read32();
if(request.read7BitLongValue()!=COOKIE_SIZE) {
ERROR("Bad handshake cookie '%s': its size should be 64 bytes",Util::FormatHex(request.current(),COOKIE_SIZE).c_str());
return 0;
}
map<const UInt8*,Cookie*,CompareCookies>::iterator itCookie = _cookies.find(request.current());
if(itCookie==_cookies.end()) {
if(id!=0x39) {
ERROR("Handshake cookie '%s' unknown",Util::FormatHex(request.current(),COOKIE_SIZE).c_str());
return 0;
}
Cookie* pCookie = new Cookie();
UInt32 pos = request.position();
request.readRaw((UInt8*)pCookie->value,COOKIE_SIZE);
request >> (string&)pCookie->queryUrl;
request.reset(pos);
itCookie = _cookies.insert(pair<const UInt8*,Cookie*>(pCookie->value,pCookie)).first;
}
Cookie& cookie(*itCookie->second);
if(cookie.id==0) {
UInt8 decryptKey[AES_KEY_SIZE];UInt8* pDecryptKey=&decryptKey[0];
UInt8 encryptKey[AES_KEY_SIZE];UInt8* pEncryptKey=&encryptKey[0];
if(id==0x38) {
request.next(COOKIE_SIZE);
size_t size = (size_t)request.read7BitLongValue();
// peerId = SHA256(farPubKey)
EVP_Digest(request.current(),size,(UInt8*)peer.id,NULL,EVP_sha256(),NULL);
vector<UInt8> publicKey(request.read7BitValue()-2);
request.next(2); // unknown
request.readRaw(&publicKey[0],publicKey.size());
size = request.read7BitValue();
cookie.computeKeys(&publicKey[0],publicKey.size(),request.current(),(UInt16)size,decryptKey,encryptKey);
} else {
// edge
pDecryptKey=NULL;
pEncryptKey=NULL;
memcpy((UInt8*)peer.id,request.current(),ID_SIZE);
request.next(COOKIE_SIZE);
request.next(request.read7BitEncoded());
}
// Fill peer infos
Util::UnpackUrl(cookie.queryUrl,(string&)peer.path,(map<string,string>&)peer.properties);
// RESPONSE
Session& session = _gateway.createSession(farId,peer,pDecryptKey,pEncryptKey,cookie);
(UInt32&)cookie.id = session.id;
string address;
if(id==0x39) {
// Session by edge
session.flags |= SESSION_BY_EDGE;
Edge* pEdge = _invoker.edges(peer.address);
if(!pEdge)
ERROR("Edge session creation by an unknown server edge %s",peer.address.toString().c_str())
else
pEdge->addSession(session);
request >> address;
} else // Session direct
address = session.peer.address.toString();
session.peer.addresses.clear();
session.peer.addresses.push_back(address);
cookie.write();
} else
UInt8 Handshake::handshakeHandler(UInt8 id,PacketReader& request,PacketWriter& response) {
switch(id){
case 0x30: {
request.read8(); // passer un caractere (boite dans boite)
UInt8 epdLen = request.read8()-1;
UInt8 type = request.read8();
string epd;
request.readRaw(epdLen,epd);
string tag;
request.readRaw(16,tag);
response.writeString8(tag);
if(type == 0x0f)
return _gateway.p2pHandshake(tag,response,peer.address,(const UInt8*)epd.c_str());
if(type == 0x0a){
/// Handshake
HelloAttempt& attempt = helloAttempt<HelloAttempt>(tag);
// Fill peer infos
UInt16 port;
string host;
Util::UnpackUrl(epd,host,port,(string&)peer.path,(map<string,string>&)peer.properties);
set<string> addresses;
peer.onHandshake(attempt.count+1,addresses);
if(!addresses.empty()) {
set<string>::iterator it;
for(it=addresses.begin();it!=addresses.end();++it) {
try {
if((*it)=="again")
((string&)*it).assign(format("%s:%hu",host,port));
SocketAddress address(*it);
response.writeAddress(address,it==addresses.begin());
} catch(Exception& ex) {
ERROR("Bad redirection address %s in hello attempt, %s",(*it)=="again" ? epd.c_str() : (*it).c_str(),ex.displayText().c_str());
}
}
return 0x71;
}
// New Cookie
createCookie(response,attempt,tag,epd);
// instance id (certificat in the middle)
response.writeRaw(_certificat,sizeof(_certificat));
return 0x70;
} else
ERROR("Unkown handshake first way with '%02x' type",type);
break;
}
case 0x38: {
(UInt32&)farId = request.read32();
if(request.read7BitLongValue()!=COOKIE_SIZE) {
ERROR("Bad handshake cookie '%s': its size should be 64 bytes",Util::FormatHex(request.current(),COOKIE_SIZE).c_str());
return 0;
}
map<const UInt8*,Cookie*,CompareCookies>::iterator itCookie = _cookies.find(request.current());
if(itCookie==_cookies.end()) {
WARN("Cookie %s unknown, maybe already connected (udpBuffer congested?)",Util::FormatHex(request.current(),COOKIE_SIZE).c_str());
return 0;
}
Cookie& cookie(*itCookie->second);
(SocketAddress&)cookie.peerAddress = peer.address;
if(cookie.farId==0) {
((UInt32&)cookie.farId) = farId;
request.next(COOKIE_SIZE);
size_t size = (size_t)request.read7BitLongValue();
// peerId = SHA256(farPubKey)
EVP_Digest(request.current(),size,(UInt8*)cookie.peerId,NULL,EVP_sha256(),NULL);
cookie.initiatorKey().resize(request.read7BitValue()-2);
request.next(2); // unknown
request.readRaw(&cookie.initiatorKey()[0],cookie.initiatorKey().size());
cookie.initiatorNonce().resize(request.read7BitValue());
request.readRaw(&cookie.initiatorNonce()[0],cookie.initiatorNonce().size());
cookie.computeKeys();
} else if(cookie.id>0) {
// Repeat cookie reponse!
cookie.read(response);
return 0x78;
} // else Keys are computing (multi-thread)
break;
}
default:
ERROR("Unkown handshake packet id %u",id);
}
return 0;
}
UInt8 RTMFPHandshake::handshakeHandler(UInt8 id,PacketReader& request,PacketWriter& response) {
switch(id){
case 0x30: {
request.next(1);
UInt8 epdLen = request.read8()-1;
UInt8 type = request.read8();
string epd;
request.readRaw(epdLen,epd);
string tag;
request.readRaw(16,tag);
response.writeString8(tag);
if(type == 0x0f) {
const UInt8* peerId = (const UInt8*)epd.c_str();
RTMFPSession* pSessionWanted = _sessions.find<RTMFPSession>(peerId);
if(pSessionWanted) {
if(pSessionWanted->failed())
return 0x00; // TODO no way in RTMFP to tell "died!"
/// Udp hole punching
UInt32 times = attempt(tag);
RTMFPSession* pSession(NULL);
if(times > 0 || peer.address.host() == pSessionWanted->peer.address.host())
pSession = _sessions.find<RTMFPSession>(peer.address);
pSessionWanted->p2pHandshake(tag,peer.address,times,pSession);
RTMFP::WriteAddress(response,pSessionWanted->peer.address, RTMFP::ADDRESS_PUBLIC);
DEBUG("P2P address initiator exchange, ",pSessionWanted->peer.address.toString());
for(const SocketAddress& address : pSessionWanted->peer.localAddresses) {
RTMFP::WriteAddress(response,address, RTMFP::ADDRESS_LOCAL);
DEBUG("P2P address initiator exchange, ",address.toString());
}
// add the turn address (RelayServer) if possible and required
if (pSession && times>0) {
UInt8 timesBeforeTurn(0);
if(pSession->peer.parameters().getNumber("timesBeforeTurn",timesBeforeTurn) && timesBeforeTurn>=times) {
UInt16 port = invoker.relayer.relay(pSession->peer.address,pSessionWanted->peer.address,20); // 20 sec de timeout is enough for RTMFP!
if(port>0) {
Exception ex;
SocketAddress address;
string addr;
SocketAddress::Split(pSession->peer.serverAddress,addr);
bool success(false);
EXCEPTION_TO_LOG(success=address.set(ex,addr, port),"RTMFP turn impossible")
if (success)
RTMFP::WriteAddress(response,address, RTMFP::ADDRESS_REDIRECTION);
} // else ERROR already display by RelayServer class
}
}
return 0x71;
}
DEBUG("UDP Hole punching, session ", Util::FormatHex(peerId, ID_SIZE, LOG_BUFFER), " wanted not found")
set<SocketAddress> addresses;
peer.onRendezVousUnknown(peerId,addresses);
set<SocketAddress>::const_iterator it;
for(it=addresses.begin();it!=addresses.end();++it) {
if(it->host().isWildcard())
continue;
if(peer.address == *it)
WARN("A client tries to connect to himself (same ",peer.address.toString()," address)");
RTMFP::WriteAddress(response,*it,RTMFP::ADDRESS_REDIRECTION);
DEBUG("P2P address initiator exchange, ",it->toString());
}
return addresses.empty() ? 0 : 0x71;
}
