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/*
** JNetLib
** Copyright (C) 2000-2001 Nullsoft, Inc.
** Author: Justin Frankel
** File: asyncdns.cpp - JNL portable asynchronous DNS implementation
** License: see jnetlib.h
*/
#include "netinc.h"
#include "util.h"
#include "asyncdns.h"
JNL_AsyncDNS::JNL_AsyncDNS()
{
m_thread=0;
m_addr=0;
m_hostname[0]=0;
}
JNL_AsyncDNS::~JNL_AsyncDNS()
{
wait_for_thread_death();
}
unsigned long WINAPI JNL_AsyncDNS::_threadfunc(LPVOID _d)
{
JNL_AsyncDNS *_this=(JNL_AsyncDNS*)_d;
struct hostent *hostentry;
hostentry=::gethostbyname(_this->m_hostname);
if (hostentry)
{
_this->m_addr=*((int*)hostentry->h_addr);
}
else
_this->m_addr=INADDR_NONE;
return 0;
}
int JNL_AsyncDNS::resolve(char *hostname, unsigned long *addr)
{
// return 0 on success, 1 on wait, -1 on unresolvable
unsigned long ip=inet_addr(hostname);
if (ip != INADDR_NONE)
{
*addr=ip;
return 0;
}
if (lstrcmpi(m_hostname,hostname)) m_addr=0;
else if (m_addr == INADDR_NONE)
{
wait_for_thread_death();
return -1;
}
else if (m_addr)
{
*addr=m_addr;
wait_for_thread_death();
return 0;
}
lstrcpy(m_hostname,hostname);
if (!m_thread)
{
DWORD id;
m_thread=CreateThread(NULL,0,_threadfunc,(LPVOID)this,0,&id);
if (!m_thread) return -1;
}
return 1;
}
void JNL_AsyncDNS::wait_for_thread_death()
{
if (m_thread)
{
WaitForSingleObject(m_thread,INFINITE);
CloseHandle(m_thread);
}
m_thread=0;
}
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