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;
}
