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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/dns.h>
#include "NetworkSingleton.h"
////////////////////////////////////////////////////////////////////////////////
// cIPLookup:
cIPLookup::cIPLookup(cNetwork::cResolveNameCallbacksPtr a_Callbacks):
m_Callbacks(a_Callbacks)
{
ASSERT(a_Callbacks != nullptr);
}
bool cIPLookup::Lookup(const AString & a_IP)
{
// Parse the IP address string into a sockaddr structure:
m_IP = a_IP;
sockaddr_storage sa;
int salen = static_cast<int>(sizeof(sa));
memset(&sa, 0, sizeof(sa));
if (evutil_parse_sockaddr_port(a_IP.c_str(), reinterpret_cast<sockaddr *>(&sa), &salen) != 0)
{
LOGD("Failed to parse IP address \"%s\".", a_IP.c_str());
return false;
}
// Call the proper resolver based on the address family:
// Note that there's no need to store the evdns_request handle returned, LibEvent frees it on its own.
switch (sa.ss_family)
{
case AF_INET:
{
sockaddr_in * sa4 = reinterpret_cast<sockaddr_in *>(&sa);
evdns_base_resolve_reverse(cNetworkSingleton::Get().GetDNSBase(), &(sa4->sin_addr), 0, Callback, this);
break;
}
case AF_INET6:
{
sockaddr_in6 * sa6 = reinterpret_cast<sockaddr_in6 *>(&sa);
evdns_base_resolve_reverse_ipv6(cNetworkSingleton::Get().GetDNSBase(), &(sa6->sin6_addr), 0, Callback, this);
break;
}
default:
{
LOGWARNING("%s: Unknown address family: %d", __FUNCTION__, sa.ss_family);
ASSERT(!"Unknown address family");
return false;
}
} // switch (address family)
return true;
}
void cIPLookup::Callback(int a_Result, char a_Type, int a_Count, int a_Ttl, void * a_Addresses, void * a_Self)
{
// Get the Self class:
cIPLookup * Self = reinterpret_cast<cIPLookup *>(a_Self);
ASSERT(Self != nullptr);
// Call the proper callback based on the event received:
if ((a_Result != 0) || (a_Addresses == nullptr))
{
// An error has occurred, notify the error callback:
Self->m_Callbacks->OnError(a_Result, evutil_socket_error_to_string(a_Result));
}
else
{
// Call the success handler:
Self->m_Callbacks->OnNameResolved(*(reinterpret_cast<char **>(a_Addresses)), Self->m_IP);
Self->m_Callbacks->OnFinished();
}
cNetworkSingleton::Get().RemoveIPLookup(Self);
}
////////////////////////////////////////////////////////////////////////////////
// cNetwork API:
bool cNetwork::IPToHostName(
const AString & a_IP,
cNetwork::cResolveNameCallbacksPtr a_Callbacks
)
{
auto res = std::make_shared<cIPLookup>(a_Callbacks);
cNetworkSingleton::Get().AddIPLookup(res);
return res->Lookup(a_IP);
}
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