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