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add a fallback if STUN to outside server isn't possible

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This commit is contained in:
Stephen Birarda 2013-10-17 15:11:02 -07:00
parent 42de553e32
commit 87d6c0085f
3 changed files with 71 additions and 41 deletions
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13
domain-server/src/DomainServer.cpp
View file

@ -518,6 +518,19 @@ int DomainServer::run() {
int numBytesPrivateSocket = unpackSocket(packetData + packetIndex, (sockaddr*) &nodePublicAddress);
packetIndex += numBytesPrivateSocket;
if (nodePublicAddress.sin_addr.s_addr == 0) {
// this node wants to use us its STUN server
// so set the node public address to whatever we perceive the public address to be
nodePublicAddress = senderAddress;
// if the sender is on our box then leave its public address to 0 so that
// other users attempt to reach it on the same address they have for the domain-server
if (senderAddress.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) {
nodePublicAddress.sin_addr.s_addr = 0;
}
}
int numBytesPublicSocket = unpackSocket(packetData + packetIndex, (sockaddr*) &nodeLocalAddress);
packetIndex += numBytesPublicSocket;

98
libraries/shared/src/NodeList.cpp
View file

@ -74,7 +74,8 @@ NodeList::NodeList(char newOwnerType, unsigned short int newSocketListenPort) :
_checkInPacket(NULL),
_numBytesCheckInPacket(0),
_publicAddress(),
_publicPort(0)
_publicPort(0),
_shouldUseDomainServerAsSTUN(0)
{
}
@ -311,53 +312,68 @@ void NodeList::setNodeTypesOfInterest(const char* nodeTypesOfInterest, int numNo
const uint32_t RFC_5389_MAGIC_COOKIE = 0x2112A442;
const int NUM_BYTES_STUN_HEADER = 20;
const int NUM_STUN_REQUESTS_BEFORE_FALLBACK = 5;
void NodeList::sendSTUNRequest() {
const char STUN_SERVER_HOSTNAME[] = "stun.highfidelity.io";
const unsigned short STUN_SERVER_PORT = 3478;
unsigned char stunRequestPacket[NUM_BYTES_STUN_HEADER];
static int failedStunRequests = 0;
int packetIndex = 0;
const uint32_t RFC_5389_MAGIC_COOKIE_NETWORK_ORDER = htonl(RFC_5389_MAGIC_COOKIE);
// leading zeros + message type
const uint16_t REQUEST_MESSAGE_TYPE = htons(0x0001);
memcpy(stunRequestPacket + packetIndex, &REQUEST_MESSAGE_TYPE, sizeof(REQUEST_MESSAGE_TYPE));
packetIndex += sizeof(REQUEST_MESSAGE_TYPE);
// message length (no additional attributes are included)
uint16_t messageLength = 0;
memcpy(stunRequestPacket + packetIndex, &messageLength, sizeof(messageLength));
packetIndex += sizeof(messageLength);
memcpy(stunRequestPacket + packetIndex, &RFC_5389_MAGIC_COOKIE_NETWORK_ORDER, sizeof(RFC_5389_MAGIC_COOKIE_NETWORK_ORDER));
packetIndex += sizeof(RFC_5389_MAGIC_COOKIE_NETWORK_ORDER);
// transaction ID (random 12-byte unsigned integer)
const uint NUM_TRANSACTION_ID_BYTES = 12;
unsigned char transactionID[NUM_TRANSACTION_ID_BYTES];
loadRandomIdentifier(transactionID, NUM_TRANSACTION_ID_BYTES);
memcpy(stunRequestPacket + packetIndex, &transactionID, sizeof(transactionID));
// lookup the IP for the STUN server
static QHostInfo stunInfo = QHostInfo::fromName(STUN_SERVER_HOSTNAME);
for (int i = 0; i < stunInfo.addresses().size(); i++) {
if (stunInfo.addresses()[i].protocol() == QAbstractSocket::IPv4Protocol) {
QString stunIPAddress = stunInfo.addresses()[i].toString();
qDebug("Sending a stun request to %s\n", stunIPAddress.toLocal8Bit().constData());
_nodeSocket.send(stunIPAddress.toLocal8Bit().constData(),
STUN_SERVER_PORT,
stunRequestPacket,
sizeof(stunRequestPacket));
break;
if (failedStunRequests < NUM_STUN_REQUESTS_BEFORE_FALLBACK) {
unsigned char stunRequestPacket[NUM_BYTES_STUN_HEADER];
int packetIndex = 0;
const uint32_t RFC_5389_MAGIC_COOKIE_NETWORK_ORDER = htonl(RFC_5389_MAGIC_COOKIE);
// leading zeros + message type
const uint16_t REQUEST_MESSAGE_TYPE = htons(0x0001);
memcpy(stunRequestPacket + packetIndex, &REQUEST_MESSAGE_TYPE, sizeof(REQUEST_MESSAGE_TYPE));
packetIndex += sizeof(REQUEST_MESSAGE_TYPE);
// message length (no additional attributes are included)
uint16_t messageLength = 0;
memcpy(stunRequestPacket + packetIndex, &messageLength, sizeof(messageLength));
packetIndex += sizeof(messageLength);
memcpy(stunRequestPacket + packetIndex, &RFC_5389_MAGIC_COOKIE_NETWORK_ORDER, sizeof(RFC_5389_MAGIC_COOKIE_NETWORK_ORDER));
packetIndex += sizeof(RFC_5389_MAGIC_COOKIE_NETWORK_ORDER);
// transaction ID (random 12-byte unsigned integer)
const uint NUM_TRANSACTION_ID_BYTES = 12;
unsigned char transactionID[NUM_TRANSACTION_ID_BYTES];
loadRandomIdentifier(transactionID, NUM_TRANSACTION_ID_BYTES);
memcpy(stunRequestPacket + packetIndex, &transactionID, sizeof(transactionID));
// lookup the IP for the STUN server
static QHostInfo stunInfo = QHostInfo::fromName(STUN_SERVER_HOSTNAME);
for (int i = 0; i < stunInfo.addresses().size(); i++) {
if (stunInfo.addresses()[i].protocol() == QAbstractSocket::IPv4Protocol) {
QString stunIPAddress = stunInfo.addresses()[i].toString();
qDebug("Sending a stun request to %s\n", stunIPAddress.toLocal8Bit().constData());
_nodeSocket.send(stunIPAddress.toLocal8Bit().constData(),
STUN_SERVER_PORT,
stunRequestPacket,
sizeof(stunRequestPacket));
break;
}
}
failedStunRequests++;
return;
}
// if we're here this was the last failed STUN request
// use our DS as our stun server
qDebug("Failed to lookup public address via STUN server at %s:%hu. Using DS for STUN.\n",
STUN_SERVER_HOSTNAME, STUN_SERVER_PORT);
_shouldUseDomainServerAsSTUN = true;
}
void NodeList::processSTUNResponse(unsigned char* packetData, size_t dataBytes) {
@ -455,7 +471,7 @@ void NodeList::sendDomainServerCheckIn() {
printedDomainServerIP = true;
}
if (_publicAddress.isNull()) {
if (_publicAddress.isNull() && !_shouldUseDomainServerAsSTUN) {
// we don't know our public socket and we need to send it to the domain server
// send a STUN request to figure it out
sendSTUNRequest();

1
libraries/shared/src/NodeList.h
View file

@ -170,6 +170,7 @@ private:
int _numBytesCheckInPacket;
QHostAddress _publicAddress;
uint16_t _publicPort;
bool _shouldUseDomainServerAsSTUN;
void activateSocketFromPingReply(sockaddr *nodeAddress);
void timePingReply(sockaddr *nodeAddress, unsigned char *packetData);