From ca4414d15afe1be65997bbb99b3b73fb67214c71 Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Fri, 8 Jul 2022 13:52:09 -0400
Subject: [PATCH] request relay tag if firewalled

---
 libi2pd/SSU2Session.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libi2pd/SSU2Session.cpp b/libi2pd/SSU2Session.cpp
index a47677fe..7041aad9 100644
--- a/libi2pd/SSU2Session.cpp
+++ b/libi2pd/SSU2Session.cpp
@@ -406,6 +406,13 @@ namespace transport
 		htobe16buf (payload + 1, 4);
 		htobe32buf (payload + 3, ts);
 		size_t payloadSize = 7;
+		if (GetRouterStatus () == eRouterStatusFirewalled)
+		{
+			// relay tag request
+			payload[payloadSize] = eSSU2BlkRelayTagRequest;
+			memset (payload + payloadSize + 1, 0, 2); // size = 0
+			payloadSize += 3;
+		}	
 		payloadSize += CreatePaddingBlock (payload + payloadSize, 40 - payloadSize, 1);
 		// KDF for session request
 		m_NoiseState->MixHash ({ {header.buf, 16}, {headerX, 16} }); // h = SHA256(h || header)