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#pragma once
#include "louloulibs.h"
#include <functional>
#include <vector>
#include <memory>
#include <string>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#ifdef UDNS_FOUND
# include <udns.h>
#endif
class AddrinfoDeleter
{
public:
void operator()(struct addrinfo* addr)
{
freeaddrinfo(addr);
}
};
class Resolver
{
public:
using ErrorCallbackType = std::function<void(const char*)>;
using SuccessCallbackType = std::function<void(const struct addrinfo*)>;
Resolver();
~Resolver() = default;
Resolver(const Resolver&) = delete;
Resolver(Resolver&&) = delete;
Resolver& operator=(const Resolver&) = delete;
Resolver& operator=(Resolver&&) = delete;
bool is_resolving() const
{
#ifdef UDNS_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 UDNS_FOUND
this->resolved6 = false;
this->resolved4 = false;
this->resolving = false;
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);
std::vector<std::string> look_in_etc_hosts(const std::string& hostname);
/**
* Call getaddrinfo() on the given hostname or IP, and append the result
* to our internal addrinfo list. Return getaddrinfo()’s return value.
*/
int call_getaddrinfo(const char* name, const char* port, int flags);
#ifdef UDNS_FOUND
void on_hostname4_resolved(dns_rr_a4 *result);
void on_hostname6_resolved(dns_rr_a6 *result);
void start_timer();
void on_resolved();
bool resolved4;
bool resolved6;
bool resolving;
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;
};
std::string addr_to_string(const struct addrinfo* rp);
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