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authorFlorent Le Coz <louiz@louiz.org>2014-07-09 13:02:37 +0200
committerFlorent Le Coz <louiz@louiz.org>2015-02-23 13:56:08 +0100
commitb86547dc1ef407ca3838444533bc7145e32a0d90 (patch)
tree3aa692def62796a5debe705ebc29d40b311e38cb /src/network/dns_socket_handler.hpp
parenta17135720e77c03e66679852198e46a070d56f4d (diff)
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Implement async DNS resolution using c-ares
fix #2533
Diffstat (limited to 'src/network/dns_socket_handler.hpp')
-rw-r--r--src/network/dns_socket_handler.hpp46
1 files changed, 46 insertions, 0 deletions
diff --git a/src/network/dns_socket_handler.hpp b/src/network/dns_socket_handler.hpp
new file mode 100644
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+++ b/src/network/dns_socket_handler.hpp
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+#ifndef DNS_SOCKET_HANDLER_HPP
+# define DNS_SOCKET_HANDLER_HPP
+
+#include <config.h>
+#ifdef CARES_FOUND
+
+#include <network/socket_handler.hpp>
+#include <ares.h>
+
+/**
+ * Manage a socket returned by ares_fds. We do not create, open or close the
+ * socket ourself: this is done by c-ares. We just call ares_process_fd()
+ * with the correct parameters, depending on what can be done on that socket
+ * (Poller reported it to be writable or readeable)
+ */
+
+class DNSSocketHandler: public SocketHandler
+{
+public:
+ explicit DNSSocketHandler(std::shared_ptr<Poller> poller, const socket_t socket);
+ ~DNSSocketHandler();
+ /**
+ * Just call dns_process_fd, c-ares will do its work of send()ing or
+ * recv()ing the data it wants on that socket.
+ */
+ void on_recv() override final;
+ void on_send() override final;
+ /**
+ * Do nothing, because we are always considered to be connected, since the
+ * connection is done by c-ares and not by us.
+ */
+ void connect() override final;
+ /**
+ * Always true, see the comment for connect()
+ */
+ bool is_connected() const override final;
+
+private:
+ DNSSocketHandler(const DNSSocketHandler&) = delete;
+ DNSSocketHandler(DNSSocketHandler&&) = delete;
+ DNSSocketHandler& operator=(const DNSSocketHandler&) = delete;
+ DNSSocketHandler& operator=(DNSSocketHandler&&) = delete;
+};
+
+#endif // CARES_FOUND
+#endif // DNS_SOCKET_HANDLER_HPP