Method HandleRelayIntro

libi2pd/SSU2Session.cpp:2255–2360

	}

	void SSU2Session::HandleRelayIntro (const uint8_t * buf, size_t len, int attempts)
	{
		// we are Charlie
		if (len < 47) return;
		SSU2RelayResponseCode code = eSSU2RelayResponseCodeAccept;
		boost::asio::ip::udp::endpoint ep;
		std::shared_ptr<const i2p::data::RouterInfo::Address> addr;
		auto r = i2p::data::netdb.FindRouter (buf + 1); // Alice
		if (r)
		{
			SignedData<128> s;
			s.Insert ((const uint8_t *)"RelayRequestData", 16); // prologue
			s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
			s.Insert (i2p::context.GetIdentHash (), 32); // chash
			s.Insert (buf + 33, 14); // nonce, relay tag, timestamp, ver, asz
			uint8_t asz = buf[46];
			if (asz + 47 + r->GetIdentity ()->GetSignatureLen () > len)
			{
				LogPrint (eLogWarning, "SSU2: Malformed RelayIntro len=", len);
				return;
			}
			s.Insert (buf + 47, asz); // Alice Port, Alice IP
			if (s.Verify (r->GetIdentity (), buf + 47 + asz))
			{
				// obtain and check endpoint and address for HolePunch
				if (ExtractEndpoint (buf + 47, asz, ep))
				{
					if (!ep.address ().is_unspecified () && ep.port ())
					{
						if (m_Server.IsSupported (ep.address ()))
						{
							addr = ep.address ().is_v6 () ? r->GetSSU2V6Address () : r->GetSSU2V4Address ();
							if (!addr)
							{
								LogPrint (eLogWarning, "SSU2: RelayIntro address for endpoint not found");
								code = eSSU2RelayResponseCodeCharlieAliceIsUnknown;
							}
						}
						else
						{
							LogPrint (eLogWarning, "SSU2: RelayIntro unsupported address");
							code = eSSU2RelayResponseCodeCharlieUnsupportedAddress;
						}
					}
					else
					{
						LogPrint (eLogWarning, "SSU2: RelayIntro invalid endpoint");
						code = eSSU2RelayResponseCodeCharlieAliceIsUnknown;
					}
				}
				else
				{
					LogPrint (eLogWarning, "SSU2: RelayIntro can't extract endpoint");
					code = eSSU2RelayResponseCodeCharlieAliceIsUnknown;
				}
			}
			else
			{