destination delivery instructions

libi2pd/ECIESX25519AEADRatchetSession.cpp

@@ -370,8 +370,8 @@ namespace garlic
     std::vector<uint8_t> ECIESX25519AEADRatchetSession::CreatePayload (std::shared_ptr<const I2NPMessage> msg)
     {
         size_t payloadLen = 7; // datatime 
-        if (msg) 
-            payloadLen += msg->GetPayloadLength () + 13;
+        if (msg && m_Destination) 
+            payloadLen += msg->GetPayloadLength () + 13 + 32;
         auto leaseSet = CreateDatabaseStoreMsg (GetOwner ()->GetLeaseSet ());
         if (leaseSet)
             payloadLen += leaseSet->GetPayloadLength () + 13;   
@@ -389,8 +389,8 @@ namespace garlic
         if (leaseSet)
             offset += CreateGarlicClove (leaseSet, v.data () + offset, payloadLen - offset);
         // msg    
-        if (msg)    
-            offset += CreateGarlicClove (msg, v.data () + offset, payloadLen - offset);
+        if (msg && m_Destination)    
+            offset += CreateGarlicClove (msg, v.data () + offset, payloadLen - offset, true);
         // padding
         v[offset] = eECIESx25519BlkPadding; offset++; 
         htobe16buf (v.data () + offset, paddingSize); offset += 2;
@@ -398,18 +398,27 @@ namespace garlic
         return v;
     }   
 
-    size_t ECIESX25519AEADRatchetSession::CreateGarlicClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len)
+    size_t ECIESX25519AEADRatchetSession::CreateGarlicClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len, bool isDestination)
     {
         if (!msg) return 0;
         uint16_t cloveSize = msg->GetPayloadLength () + 9 + 1;
+		if (isDestination) cloveSize += 32;
         if ((int)len < cloveSize + 3) return 0;
         buf[0] = eECIESx25519BlkGalicClove; // clove type
-        htobe16buf (buf + 1, cloveSize); // size        
-        buf[3] = 0; // flag and delivery instructions
-        buf[4] = msg->GetTypeID (); // I2NP msg type
-        htobe32buf (buf + 5, msg->GetMsgID ()); // msgID     
-        htobe32buf (buf + 9, msg->GetExpiration ()/1000); // expiration in seconds     
-        memcpy (buf + 13, msg->GetPayload (), msg->GetPayloadLength ());
+        htobe16buf (buf + 1, cloveSize); // size   
+		buf += 3;
+		if (isDestination)
+		{
+			*buf = (eGarlicDeliveryTypeDestination << 5);
+			memcpy (buf + 1, *m_Destination, 32); buf += 32;
+		}
+		else
+			*buf = 0; 
+		buf++;	// flag and delivery instructions
+        *buf = msg->GetTypeID (); // I2NP msg type
+        htobe32buf (buf + 1, msg->GetMsgID ()); // msgID     
+        htobe32buf (buf + 5, msg->GetExpiration ()/1000); // expiration in seconds     
+        memcpy (buf + 9, msg->GetPayload (), msg->GetPayloadLength ());
         return cloveSize + 3;
     }
  

libi2pd/ECIESX25519AEADRatchetSession.h

@@ -70,6 +70,11 @@ namespace garlic
             const uint8_t * GetRemoteStaticKey () const { return m_RemoteStaticKey; }
 			void SetRemoteStaticKey (const uint8_t * key) { memcpy (m_RemoteStaticKey, key, 32); }
 
+			void SetDestination (const i2p::data::IdentHash& dest) // TODO:
+			{
+				if (!m_Destination) m_Destination.reset (new i2p::data::IdentHash (dest));
+			}
+
         private:
 
 			void ResetKeys ();
@@ -84,7 +89,7 @@ namespace garlic
             bool NewOutgoingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen);
             bool NewSessionReplyMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen);
             std::vector<uint8_t> CreatePayload (std::shared_ptr<const I2NPMessage> msg);
-            size_t CreateGarlicClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len);
+            size_t CreateGarlicClove (std::shared_ptr<const I2NPMessage> msg, uint8_t * buf, size_t len, bool isDestination = false);
 
         private:
 
@@ -93,6 +98,7 @@ namespace garlic
             i2p::crypto::X25519Keys m_EphemeralKeys;
             SessionState m_State = eSessionStateNew;
             RatchetTagSet m_TagsetAB, m_TagsetBA;
+			std::unique_ptr<i2p::data::IdentHash> m_Destination;// TODO: might not need it 
     };
 }
 }

libi2pd/Garlic.cpp

@@ -669,6 +669,7 @@ namespace garlic
 				session = std::make_shared<ECIESX25519AEADRatchetSession> (this);
 				session->SetRemoteStaticKey (staticKey);
 			}	
+			session->SetDestination (destination->GetIdentHash ()); // TODO: remove
             return session;
         }
         else
@@ -860,8 +861,6 @@ namespace garlic
 
 	void GarlicDestination::HandleECIESx25519 (const uint8_t * buf, size_t len)
 	{
-        auto handleClove = std::bind (&GarlicDestination::HandleECIESx25519GarlicClove,
-            this, std::placeholders::_1, std::placeholders::_2);
         uint64_t tag;
         memcpy (&tag, buf, 8);
 		ECIESX25519AEADRatchetSessionPtr session;
@@ -874,7 +873,8 @@ namespace garlic
 		else
 			session = std::make_shared<ECIESX25519AEADRatchetSession> (this); // incoming
 		
-		if (!session->HandleNextMessage (buf, len, handleClove))
+		if (!session->HandleNextMessage (buf, len, std::bind (&GarlicDestination::HandleECIESx25519GarlicClove,
+            this, std::placeholders::_1, std::placeholders::_2)))
         	LogPrint (eLogError, "Garlic: can't handle ECIES-X25519-AEAD-Ratchet message");
 	}