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2001-10-08
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291 lines
/*
Nullsoft WASABI Source File License
Copyright 1999-2001 Nullsoft, Inc.
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Brennan Underwood
brennan@nullsoft.com
*/
/*
** 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(int max_cache_entries)
{
m_thread_kill=1;
m_thread=0;
m_cache_size=max_cache_entries;
m_cache=(cache_entry *)::malloc(sizeof(cache_entry)*m_cache_size);
memset(m_cache,0,sizeof(cache_entry)*m_cache_size);
}
JNL_AsyncDNS::~JNL_AsyncDNS()
{
#ifndef NO_DNS_SUPPORT
m_thread_kill=1;
#ifdef _WIN32
if (m_thread)
{
WaitForSingleObject(m_thread,INFINITE);
CloseHandle(m_thread);
}
#else
if (m_thread)
{
void *p;
pthread_join(m_thread,&p);
}
#endif//!_WIN32
#endif//NO_DNS_SUPPORT
free(m_cache);
}
#ifdef _WIN32
unsigned long WINAPI JNL_AsyncDNS::_threadfunc(LPVOID _d)
#else
unsigned int JNL_AsyncDNS::_threadfunc(void *_d)
#endif
{
#ifndef NO_DNS_SUPPORT
int nowinsock=JNL::open_socketlib();
JNL_AsyncDNS *_this=(JNL_AsyncDNS*)_d;
int x;
for (x = 0; x < _this->m_cache_size && !_this->m_thread_kill; x ++)
{
if (_this->m_cache[x].last_used && !_this->m_cache[x].resolved)
{
if (!nowinsock)
{
if (_this->m_cache[x].mode==0)
{
struct hostent *hostentry;
hostentry=::gethostbyname(_this->m_cache[x].hostname);
if (hostentry)
{
_this->m_cache[x].addr=*((int*)hostentry->h_addr);
}
else
_this->m_cache[x].addr=INADDR_NONE;
}
else if (_this->m_cache[x].mode==1)
{
struct hostent *ent;
ent=::gethostbyaddr((const char *)&_this->m_cache[x].addr,4,AF_INET);
if (ent)
{
strncpy(_this->m_cache[x].hostname,ent->h_name,255);
_this->m_cache[x].hostname[255]=0;
}
else
{
_this->m_cache[x].hostname[0]=0;
}
}
_this->m_cache[x].resolved=1;
}
else
{
if (_this->m_cache[x].mode==0)
{
_this->m_cache[x].addr=INADDR_NONE;
_this->m_cache[x].resolved=1;
}
else if (_this->m_cache[x].mode==1)
{
_this->m_cache[x].hostname[0]=0;
_this->m_cache[x].resolved=1;
}
}
}
}
if (!nowinsock) JNL::close_socketlib();
_this->m_thread_kill=1;
#endif // NO_DNS_SUPPORT
return 0;
}
int JNL_AsyncDNS::resolve(char *hostname, unsigned long *addr)
{
// return 0 on success, 1 on wait, -1 on unresolvable
int x;
unsigned long ip=inet_addr(hostname);
if (ip != INADDR_NONE)
{
*addr=ip;
return 0;
}
#ifndef NO_DNS_SUPPORT
for (x = 0; x < m_cache_size; x ++)
{
if (!strcasecmp(m_cache[x].hostname,hostname) && m_cache[x].mode==0)
{
m_cache[x].last_used=time(NULL);
if (m_cache[x].resolved)
{
if (m_cache[x].addr == INADDR_NONE)
{
return -1;
}
struct in_addr in;
in.s_addr=m_cache[x].addr;
*addr=m_cache[x].addr;
return 0;
}
makesurethreadisrunning();
return 1;
}
}
// add to resolve list
int oi=-1;
for (x = 0; x < m_cache_size; x ++)
{
if (!m_cache[x].last_used)
{
oi=x;
break;
}
if ((oi==-1 || m_cache[x].last_used < m_cache[oi].last_used) && m_cache[x].resolved)
{
oi=x;
}
}
if (oi == -1)
{
return -1;
}
strcpy(m_cache[oi].hostname,hostname);
m_cache[oi].mode=0;
m_cache[oi].addr=INADDR_NONE;
m_cache[oi].resolved=0;
m_cache[oi].last_used=time(NULL);
makesurethreadisrunning();
return 1;
#else
return -1;
#endif
}
int JNL_AsyncDNS::reverse(unsigned long addr, char *hostname)
{
// return 0 on success, 1 on wait, -1 on unresolvable
int x;
if (addr == INADDR_NONE)
{
return -1;
}
#ifndef NO_DNS_SUPPORT
for (x = 0; x < m_cache_size; x ++)
{
if (m_cache[x].addr==addr && m_cache[x].mode==1)
{
m_cache[x].last_used=time(NULL);
if (m_cache[x].resolved)
{
if (!m_cache[x].hostname[0])
{
return -1;
}
strncpy(hostname,m_cache[x].hostname,255);
hostname[255]=0;
return 0;
}
makesurethreadisrunning();
return 1;
}
}
// add to resolve list
int oi=-1;
for (x = 0; x < m_cache_size; x ++)
{
if (!m_cache[x].last_used)
{
oi=x;
break;
}
if ((oi==-1 || m_cache[x].last_used < m_cache[oi].last_used) && m_cache[x].resolved)
{
oi=x;
}
}
if (oi == -1)
{
return -1;
}
m_cache[oi].addr=addr;
m_cache[oi].hostname[0]=0;
m_cache[oi].resolved=0;
m_cache[oi].mode=1;
m_cache[oi].last_used=time(NULL);
makesurethreadisrunning();
return 1;
#else
return -1;
#endif
}
void JNL_AsyncDNS::makesurethreadisrunning(void)
{
#ifndef NO_DNS_SUPPORT
if (m_thread_kill)
{
#ifdef _WIN32
if (m_thread)
{
WaitForSingleObject(m_thread,INFINITE);
CloseHandle(m_thread);
}
DWORD id;
m_thread_kill=0;
m_thread=CreateThread(NULL,0,_threadfunc,(LPVOID)this,0,&id);
if (!m_thread)
{
#else
if (m_thread)
{
void *p;
pthread_join(m_thread,&p);
}
m_thread_kill=0;
if (pthread_create(&m_thread,NULL,(void *(*) (void *))_threadfunc,(void*)this) != 0)
{
#endif
m_thread_kill=1;
}
}
#endif//NO_DNS_SUPPORT
}