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