130 lines
2.8 KiB
C++
130 lines
2.8 KiB
C++
#ifndef RESOLVER_HPP_INCLUDED
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#define RESOLVER_HPP_INCLUDED
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#include "louloulibs.h"
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#include <functional>
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#include <memory>
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#include <string>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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struct AddrinfoDeleter
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{
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void operator()(struct addrinfo* addr)
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{
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#ifdef CARES_FOUND
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while (addr)
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{
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delete addr->ai_addr;
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auto next = addr->ai_next;
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delete addr;
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addr = next;
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}
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#else
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freeaddrinfo(addr);
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#endif
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}
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};
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class Resolver
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{
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public:
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using ErrorCallbackType = std::function<void(const char*)>;
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using SuccessCallbackType = std::function<void(const struct addrinfo*)>;
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Resolver();
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~Resolver() = default;
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bool is_resolving() const
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{
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#ifdef CARES_FOUND
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return this->resolving;
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#else
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return false;
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#endif
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}
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bool is_resolved() const
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{
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return this->resolved;
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}
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const auto& get_result() const
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{
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return this->addr;
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}
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std::string get_error_message() const
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{
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return this->error_msg;
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}
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void clear()
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{
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#ifdef CARES_FOUND
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this->resolved6 = false;
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this->resolved4 = false;
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#endif
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this->resolved = false;
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this->resolving = false;
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this->addr.reset();
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this->cares_addrinfo = nullptr;
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this->port.clear();
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this->error_msg.clear();
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}
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void resolve(const std::string& hostname, const std::string& port,
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SuccessCallbackType success_cb, ErrorCallbackType error_cb);
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private:
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void start_resolving(const std::string& hostname, const std::string& port);
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#ifdef CARES_FOUND
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void on_hostname4_resolved(int status, struct hostent* hostent);
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void on_hostname6_resolved(int status, struct hostent* hostent);
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void fill_ares_addrinfo4(const struct hostent* hostent);
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void fill_ares_addrinfo6(const struct hostent* hostent);
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void on_resolved();
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bool resolved4;
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bool resolved6;
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bool resolving;
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/**
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* When using c-ares to resolve the host asynchronously, we need the
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* c-ares callbacks to fill a structure (a struct addrinfo, for
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* compatibility with getaddrinfo and the rest of the code that works when
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* c-ares is not used) with all returned values (for example an IPv6 and
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* an IPv4). The pointer is given to the unique_ptr to manage its lifetime.
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*/
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struct addrinfo* cares_addrinfo;
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std::string port;
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#endif
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/**
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* Tells if we finished the resolution process. It doesn't indicate if it
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* was successful (it is true even if the result is an error).
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*/
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bool resolved;
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std::string error_msg;
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std::unique_ptr<struct addrinfo, AddrinfoDeleter> addr;
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ErrorCallbackType error_cb;
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SuccessCallbackType success_cb;
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Resolver(const Resolver&) = delete;
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Resolver(Resolver&&) = delete;
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Resolver& operator=(const Resolver&) = delete;
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Resolver& operator=(Resolver&&) = delete;
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};
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std::string addr_to_string(const struct addrinfo* rp);
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#endif /* RESOLVER_HPP_INCLUDED */
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