From 0fb433690c0ca5f9561fe9e2e973e2cd61b873ba Mon Sep 17 00:00:00 2001
From: Dennis Brentjes <d.brentjes@gmail.com>
Date: Tue, 11 Oct 2016 12:39:05 +0200
Subject: Commit introducing Client keyexchange, triggering bugs.

Clients now send their public key to each node and the node calculates
the shared secret. The node does not yet respond with it's public key.
To keep this commit smaller.

Nodes now disconnect from each other in a better way.

Getting the relevant crypto api is now done with a generic function.
What crypto algorithm and implemenation is beign used can be selected in
the cmake cache (use cmake-gui or ccmake)

Clients now connect correctly to multiple nodes.
---
 client/cmixclient.cpp | 82 ++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 65 insertions(+), 17 deletions(-)

(limited to 'client/cmixclient.cpp')

diff --git a/client/cmixclient.cpp b/client/cmixclient.cpp
index e3f5ac4..195c5e0 100644
--- a/client/cmixclient.cpp
+++ b/client/cmixclient.cpp
@@ -1,38 +1,86 @@
 
 #include "cmixclient.hpp"
 
-void CMixClient::initialized() {
-	BOOST_LOG_TRIVIAL(trace) << "Client connections were made";
-	for(auto&& connection : network_connections) {
-		cmix_proto::Bye bye;
-		connection.send(bye);
-	}
-	io_service.stop();
+void CMixClient::key_exchange(int i) {
+	shared_keys.resize(network_connections.size());
+		
+	cmix_proto::KeyExchange ke;
+	ke.set_public_key(keypair.pub, keypair.pub_len);
+		
+	network_connections[i].send(ke);
+		
+	cmix_proto::Bye bye;
+	network_connections[i].send(bye);
 }
 
 void CMixClient::initialize_connections() {
 	network_connections.reserve(network_details.size());
 	
-	int i = network_details.size();
-	auto handler = [this, i]() mutable {
-		cmix_proto::ImAClient imaclient;
-		network_connections.at(network_details.size() - i).send(imaclient);
+	for(int i = 0; i < network_details.size(); ++i) {
+		auto handler = [this, i]() mutable {
+			cmix_proto::ImAClient imaclient;
+			BOOST_LOG_TRIVIAL(trace) << "sending imaclient to node: " << i;
+			network_connections.at(i).send(imaclient);
 		
-		if(--i == 0) {
-			initialized();
-		}
-	};
+			key_exchange(i);
+		};
 	
-	for(auto&& details : network_details) {
 		network_connections.emplace_back(boost::asio::ip::tcp::socket(io_service));
-		network_connections.back().async_connect(details.host, details.port, handler);
+		network_connections.back().async_connect(network_details[i].host, network_details[i].port, handler);
+	
+	}
+}
+
+cmix_proto::CMixMessage CMixClient::parse_cmix_message(std::vector<uint8_t> const& buffer)
+{
+	cmix_proto::CMixMessage message;
+	if(!message.ParseFromArray(buffer.data(), buffer.size())) {
+		BOOST_LOG_TRIVIAL(error) << "Received something which was not a CMixMessage";
+		throw std::runtime_error("Network communication was disrupted in a unrecoverable way.");
+	}
+	return message;
+}
+
+void CMixClient::handle_key_exchange(int node_id, cmix_proto::KeyExchange const& ke)
+{
+	shared_keys[node_id] = api.derive_shared_key(keypair, reinterpret_cast<uint8_t const*>(ke.public_key().c_str()), false);
+}
+
+void CMixClient::handle_message(int node_id, std::vector<uint8_t> const& message_buffer)
+{
+	cmix_proto::CMixMessage message;
+	try {
+		message = parse_cmix_message(message_buffer);
+	} catch(std::runtime_error const& e) {
+		for(auto&& connection : network_connections) {
+			connection.close();
+		}
+		io_service.stop();
+		return;
+	}
+	
+	switch(message.contents_case()) {
+		case cmix_proto::CMixMessage::ContentsCase::kKeyexchange: {
+			handle_key_exchange(node_id, *message.mutable_keyexchange());
+			return;
+		}
+		default: {
+			BOOST_LOG_TRIVIAL(error) << "Received unknown message";
+		}
 	}
+	
+	for(auto&& connection : network_connections) {
+		connection.close();
+	}
+	io_service.stop();
 }
 
 CMixClient::CMixClient(std::vector<NodeDetails> details)
 : io_service()
 , network_details(details)
 , network_connections()
+, api(get_implementation())
+, keypair(api.create_key_pair())
 {
 	initialize_connections();
 }
-- 
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