Moved files to correct folders and changed example slightly

1 files changed, 306 insertions, 0 deletions

diff --git a/modules/io-tls/c++/tls.cpp b/modules/io-tls/c++/tls.cpp
new file mode 100644
index 0000000..1c42215
--- /dev/null
+++ b/modules/io-tls/c++/tls.cpp
@@ -0,0 +1,306 @@
+#include "tls.hpp"
+
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+
+#include <forstio/io/io_helpers.hpp>
+
+#include <cassert>
+
+#include <iostream>
+
+namespace saw {
+
+class tls::impl {
+public:
+	gnutls_certificate_credentials_t xcred;
+
+public:
+	impl() {
+		gnutls_global_init();
+		gnutls_certificate_allocate_credentials(&xcred);
+		gnutls_certificate_set_x509_system_trust(xcred);
+	}
+
+	~impl() {
+		gnutls_certificate_free_credentials(xcred);
+		gnutls_global_deinit();
+	}
+};
+
+static ssize_t forst_tls_push_func(gnutls_transport_ptr_t p, const void *data,
+						 size_t size);
+static ssize_t forst_tls_pull_func(gnutls_transport_ptr_t p, void *data, size_t size);
+
+tls::tls() : impl_{heap<tls::impl>()} {}
+
+tls::~tls() {}
+
+tls::impl &tls::get_impl() { return *impl_; }
+
+template<typename T>
+class tls_io_stream final : public io_stream<net::Tls<T>> {
+private:
+	own<io_stream<T>> internal_;
+	gnutls_certificate_credentials_t xcred_;
+	gnutls_session_t session_handle_;
+
+public:
+	tls_io_stream(own<io_stream<T>> internal__, gnutls_certificate_credentials_t xcred__, gnutls_session_t session_handle__):
+		internal_{std::move(internal__)},
+		xcred_{xcred__},
+		session_handle_{session_handle__}
+	{}
+
+	~tls_io_stream() { gnutls_bye(session_handle_, GNUTLS_SHUT_RDWR); }
+
+	error_or<size_t> read(void *buffer, size_t length) override {
+		ssize_t size = gnutls_record_recv(session_handle_, buffer, length);
+		if (size < 0) {
+			if(gnutls_error_is_fatal(size) == 0){
+				return make_error<err::recoverable>("Recoverable error on read in gnutls. TODO better error msg handling");
+				// Leaving proper message handling done in previous error framework
+				//return recoverable_error([size](){return std::string{"Read recoverable Error "}+std::string{gnutls_strerror(size)};}, "Error read r");
+			}else{
+				return make_error<err::critical>("Fatal error on read in gnutls. TODO better error msg handling");
+			}
+		}else if(size == 0){
+			return make_error<err::disconnected>();
+		}
+
+		return static_cast<size_t>(length);
+	}
+
+	conveyor<void> read_ready() override { return internal_->read_ready(); }
+
+	conveyor<void> on_read_disconnected() override {
+		return internal_->on_read_disconnected();
+	}
+
+	error_or<size_t> write(const void *buffer, size_t length) override {
+		ssize_t size = gnutls_record_send(session_handle_, buffer, length);
+		if(size < 0){
+			if(gnutls_error_is_fatal(size) == 0){
+				return make_error<err::recoverable>("Recoverable error on write in gnutls. TODO better error msg handling");
+			}else{
+				return make_error<err::critical>("Fatal error on write in gnutls. TODO better error msg handling");
+			}
+		}
+
+		return static_cast<size_t>(size);
+	}
+
+	conveyor<void> write_ready() override { return internal_->write_ready(); }
+
+	gnutls_session_t &session() { return session_handle_; }
+};
+
+template<typename T>
+class tls_server final : public server<net::Tls<T>> {
+private:
+	own<server<T>> internal_;
+	gnutls_certificate_credentials_t xcred_;
+	gnutls_session_t session_handle_;
+
+public:
+	tls_server(own<server<T>> internal__, gnutls_certificate_credentials_t xcred__):
+		internal_{std::move(internal__)}
+	{}
+
+	~tls_server() {
+		gnutls_bye(session_handle_, GNUTLS_SHUT_RDWR);
+		gnutls_certificate_free_credentials(xcred_);
+	}
+
+	conveyor<own<io_stream<net::Tls<T>>>> accept() override;
+};
+
+template<typename T>
+class tls_network final : public network<net::Tls<T>> {
+private:
+	ref<tls> tls_;
+	ref<network<T>> internal_;
+public:
+	tls_network(tls& tls_, network<T> &network_);
+
+	conveyor<own<network_address<net::Tls<T>>>> resolve_address(const std::string &addr, uint16_t port = 0) override;
+	
+	own<server<net::Tls<T>>> listen(const network_address<net::Tls<T>>& address) override;
+
+	conveyor<own<io_stream<net::Tls<T>>>> connect(const network_address<net::Tls<T>>& address) override;
+
+	own<datagram<net::Tls<T>>> bind_datagram(const network_address<net::Tls<T>>& address) override;
+};
+
+template<typename T>
+conveyor<own<io_stream<net::Tls<T>>>> tls_server<T>::accept() {
+	SAW_ASSERT(internal_) { return conveyor<own<io_stream<net::Tls<T>>>>{fix_void<own<io_stream<net::Tls<T>>>>{nullptr}}; }
+	return internal_->accept().then([](own<io_stream<T>> stream) -> own<io_stream<net::Tls<T>>> {
+		/// @todo handshake
+
+		return heap<tls_io_stream<T>>(std::move(stream));
+	});
+}
+
+namespace {
+/*
+* Small helper for setting up the nonblocking connection handshake
+*/
+template<typename T>
+struct tls_client_stream_helper {
+public:
+	own<conveyor_feeder<own<io_stream<net::Tls<T>>>>> feeder;
+	conveyor_sink connection_sink;
+	conveyor_sink stream_reader;
+	conveyor_sink stream_writer;
+
+	own<tls_io_stream<T>> stream = nullptr;
+public:
+	tls_client_stream_helper(own<conveyor_feeder<own<io_stream<net::Tls<T>>>>> f):
+		feeder{std::move(f)}
+	{}
+
+	void setupTurn(){
+		SAW_ASSERT(stream){
+			return;
+		}
+
+		stream_reader = stream->read_ready().then([this](){
+			turn();
+		}).sink();
+
+		stream_writer = stream->write_ready().then([this](){
+			turn();
+		}).sink();
+	}
+
+	void turn(){
+		if(stream){
+			// Guarantee that the receiving end is already setup
+			SAW_ASSERT(feeder){
+				return;
+			}
+
+			auto &session = stream->session();
+
+			int ret;
+			do {
+				ret = gnutls_handshake(session);
+			} while ( (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED) && gnutls_error_is_fatal(ret) == 0);
+
+			if(gnutls_error_is_fatal(ret)){
+				feeder->fail(make_error<err::critical>("Couldn't create Tls connection"));
+				stream = nullptr;
+			}else if(ret == GNUTLS_E_SUCCESS){
+				feeder->feed(std::move(stream));
+			}
+		}
+	}
+};
+}
+
+template<typename T>
+own<server<net::Tls<T>>> tls_network<T>::listen(const network_address<net::Tls<T>>& address) {
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_certificate_allocate_credentials(&x509_cred);
+	auto int_srv = internal_.listen(address);
+
+	return heap<tls_server>(std::move(int_srv), x509_cred);
+}
+
+template<typename T>
+conveyor<own<io_stream<net::Tls<T>>>> tls_network<T>::connect(const network_address<net::Tls<T>>& address) {
+	// Helper setups
+	auto caf = new_conveyor_and_feeder<own<io_stream<net::Tls<T>>>>();
+	own<tls_client_stream_helper<T>> helper = heap<tls_client_stream_helper<T>>(std::move(caf.feeder));
+	tls_client_stream_helper<T>* hlp_ptr = helper.get();
+	
+	// Conveyor entangled structure
+	auto prim_conv = internal_.connect(address).then([this, hlp_ptr, addr = address.address()](
+										own<io_stream<T>> stream) -> error_or<void> {
+		io_stream<T>* inner_stream = stream.get();
+		auto tls_stream = heap<tls_io_stream<T>>(std::move(stream));
+
+		auto &session = tls_stream->session();
+
+		gnutls_init(&session, GNUTLS_CLIENT);
+
+		gnutls_server_name_set(session, GNUTLS_NAME_DNS, addr.c_str(),
+							   addr.size());
+
+		gnutls_set_default_priority(session);
+		gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
+							   tls_().get_impl().xcred);
+		gnutls_session_set_verify_cert(session, addr.c_str(), 0);
+
+		gnutls_transport_set_ptr(session, reinterpret_cast<gnutls_transport_ptr_t>(inner_stream));
+		gnutls_transport_set_push_function(session, forst_tls_push_func);
+		gnutls_transport_set_pull_function(session, forst_tls_pull_func);
+
+		// gnutls_handshake_set_timeout(session, GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT);
+
+		hlp_ptr->stream = std::move(tls_stream);
+		hlp_ptr->setupTurn();
+		hlp_ptr->turn();
+
+		return void_t{};
+	});
+
+	helper->connection_sink = prim_conv.sink();
+
+	return caf.conveyor.attach(std::move(helper));
+}
+
+template<typename T>
+own<datagram<net::Tls<T>>> tls_network<T>::bind_datagram(const network_address<net::Tls<T>>& address){
+	///@unimplemented
+	return nullptr;
+}
+
+template<typename T>
+static ssize_t forst_tls_push_func(gnutls_transport_ptr_t p, const void *data,
+						 size_t size) {
+	io_stream<T> *stream = reinterpret_cast<io_stream<T>*>(p);
+	if (!stream) {
+		return -1;
+	}
+
+	error_or<size_t> length = stream->write(data, size);
+	if (length.is_error() || !length.is_value()) {
+		return -1;
+	}
+
+	return static_cast<ssize_t>(length.get_value());
+}
+
+template<typename T>
+static ssize_t forst_tls_pull_func(gnutls_transport_ptr_t p, void *data, size_t size) {
+	io_stream<T> *stream = reinterpret_cast<io_stream<T>*>(p);
+	if (!stream) {
+		return -1;
+	}
+
+	error_or<size_t> length = stream->read(data, size);
+	if (length.is_error() || !length.is_value()) {
+		return -1;
+	}
+
+	return static_cast<ssize_t>(length.get_value());
+}
+
+template<typename T>
+tls_network<T>::tls_network(tls& tls_, network<T> &network) : tls_{tls_},internal_{network} {}
+
+template<typename T>
+conveyor<own<network_address<net::Tls<T>>>> tls_network<T>::resolve_address(const std::string &addr,
+													   uint16_t port) {
+	/// @todo tls server name needed. Check validity. Won't matter later on, because gnutls should fail anyway. But
+	/// it's better to find the error source sooner rather than later
+	return internal_.resolve_address(addr, port);
+}
+
+template<typename T>
+error_or<own<network<net::Tls<T>>>> setup_tls_network(network<net::Tls<T>> &network) {
+	return make_error<err::not_implemented>();
+}
+} // namespace saw