feat(server): support tdesktop

[ernado]

Meta-issue for tdesktop support on server and protocol.

• tdesktop fork patched for localhost and test private key
• teled, server based on tgtest

int TcpConnection::Protocol::Version0::readPacketLength(
		bytes::const_span bytes) const {
	if (bytes.empty()) {
		return kUnknownSize;
	}

	const auto first = static_cast<char>(bytes[0]);
	if (first == 0x7F) {
		if (bytes.size() < 4) {
			return kUnknownSize;
		}
		const auto ints = static_cast<uint32>(bytes[1])
			| (static_cast<uint32>(bytes[2]) << 8)
			| (static_cast<uint32>(bytes[3]) << 16);
		return (ints >= 0x7F) ? (int(ints << 2) + 4) : kInvalidSize;
	} else if (first > 0 && first < 0x7F) {
		const auto ints = uint32(first);
		return int(ints << 2) + 1;
	}
	return kInvalidSize;
}

This looks like abridged, but it is currently not working:

• read: read: read abridged: read payload: unexpected EOF when no header
• Invalid header with header

Other implementations

• teamgram-server
• marmota, teamgram protocol implementation

cc: @tdakkota

[ernado]

[ernado]

[13:12:33.034 02-0002899] Connection 740(dc:1,) Info: Sending 88 len request. (connection_abstract.cpp : 25)
[13:12:33.035 02-0002900] Connection 737(dc:1,127.0.0.1:9443) Info: Sending fake req_pq. (connection_abstract.cpp : 25)
[13:12:33.035 02-0002901] Connection 737(dc:1,127.0.0.1:9443) Info: TCP Info: write packet 77 bytes. (connection_abstract.cpp : 25)

[ernado]

Thank you for help guys!