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