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// IPLookup.cpp
// Implements the cIPLookup class representing an IP-to-hostname lookup in progress.
#include "Globals.h"
#include "IPLookup.h"
#include <event2/util.h>
#include "NetworkSingleton.h"
#include "GetAddressInfoError.h"
////////////////////////////////////////////////////////////////////////////////
// cIPLookup:
cIPLookup::cIPLookup(const AString & a_IP, cNetwork::cResolveNameCallbacksPtr a_Callbacks) :
m_Callbacks(std::move(a_Callbacks)), m_IP(a_IP)
{
ASSERT(m_Callbacks != nullptr);
}
void cIPLookup::Lookup(const AString & a_IP, cNetwork::cResolveNameCallbacksPtr a_Callbacks)
{
cIPLookupPtr Lookup {new cIPLookup(a_IP, std::move(a_Callbacks))
}; // Cannot use std::make_shared here, constructor is not accessible
// Note the Lookup object is owned solely by this lambda which is destroyed after it runs
cNetworkSingleton::Get().GetLookupThread().ScheduleLookup(
[=]()
{
sockaddr_storage sa;
int salen = sizeof(sa);
memset(&sa, 0, sizeof(sa));
int ErrCode = evutil_parse_sockaddr_port(Lookup->m_IP.c_str(), reinterpret_cast<sockaddr *>(&sa), &salen);
if (ErrCode != 0)
{
LOGD("Failed to parse IP address \"%s\".", Lookup->m_IP.c_str());
Lookup->Callback(ErrCode, nullptr);
return;
}
char Hostname[NI_MAXHOST];
char ServInfo[NI_MAXSERV];
ErrCode = getnameinfo(
reinterpret_cast<sockaddr *>(&sa),
static_cast<socklen_t>(salen),
Hostname,
sizeof(Hostname),
ServInfo,
sizeof(ServInfo),
0
);
Lookup->Callback(ErrCode, Hostname);
}
);
}
void cIPLookup::Callback(int a_Result, const char * a_Address)
{
// Call the proper callback based on the event received:
if ((a_Result != 0) || (a_Address == nullptr))
{
// An error has occurred, notify the error callback:
m_Callbacks->OnError(a_Result, ErrorString(a_Result));
}
else
{
// Call the success handler:
m_Callbacks->OnNameResolved(a_Address, m_IP);
m_Callbacks->OnFinished();
}
}
////////////////////////////////////////////////////////////////////////////////
// cNetwork API:
bool cNetwork::IPToHostName(const AString & a_IP, cNetwork::cResolveNameCallbacksPtr a_Callbacks)
{
cIPLookup::Lookup(a_IP, std::move(a_Callbacks));
return true;
}
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