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-rw-r--r--src/network/dns_handler.hpp62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/network/dns_handler.hpp b/src/network/dns_handler.hpp
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+++ b/src/network/dns_handler.hpp
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+#ifndef DNS_HANDLER_HPP_INCLUDED
+#define DNS_HANDLER_HPP_INCLUDED
+
+#include <config.h>
+#ifdef CARES_FOUND
+
+class TCPSocketHandler;
+class Poller;
+class DNSSocketHandler;
+
+# include <ares.h>
+# include <memory>
+# include <string>
+# include <list>
+
+void on_hostname4_resolved(void* arg, int status, int, struct hostent* hostent);
+void on_hostname6_resolved(void* arg, int status, int, struct hostent* hostent);
+
+/**
+ * Class managing DNS resolution. It should only be statically instanciated
+ * once in SocketHandler. It manages ares channel and calls various
+ * functions of that library.
+ */
+
+class DNSHandler
+{
+public:
+ DNSHandler();
+ ~DNSHandler() = default;
+ void gethostbyname(const std::string& name, TCPSocketHandler* socket_handler,
+ int family);
+ /**
+ * Call ares_fds to know what fd needs to be watched by the poller, create
+ * or destroy DNSSocketHandlers depending on the result.
+ */
+ void watch_dns_sockets(std::shared_ptr<Poller>& poller);
+ /**
+ * Destroy and stop watching all the DNS sockets. Then de-init the channel
+ * and library.
+ */
+ void destroy();
+ ares_channel& get_channel();
+
+ static DNSHandler instance;
+
+private:
+ /**
+ * The list of sockets that needs to be watched, according to the last
+ * call to ares_fds. DNSSocketHandlers are added to it or removed from it
+ * in the watch_dns_sockets() method
+ */
+ std::list<std::unique_ptr<DNSSocketHandler>> socket_handlers;
+ ares_channel channel;
+
+ DNSHandler(const DNSHandler&) = delete;
+ DNSHandler(DNSHandler&&) = delete;
+ DNSHandler& operator=(const DNSHandler&) = delete;
+ DNSHandler& operator=(DNSHandler&&) = delete;
+};
+
+#endif /* CARES_FOUND */
+#endif /* DNS_HANDLER_HPP_INCLUDED */