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/*
** JNetLib
** Copyright (C) 2000-2007 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"
#include <time.h>
#ifdef _WIN32
#include <strsafe.h>
#endif
enum
{
MODE_RESOLVE=0,
MODE_REVERSE=1,
};
struct cache_entry
{
time_t last_used; // timestamp.
bool resolved;
int mode; // 1=reverse
unsigned short port;
char hostname[256];
addrinfo *addr;
int sockettype;
};
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()
{
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
// free all the addrinfo stuff
for (int x = 0; x < m_cache_size; x ++)
{
if (m_cache[x].addr)
freeaddrinfo(m_cache[x].addr);
}
free(m_cache);
}
int JNL_AsyncDNS::resolvenow(const char *hostname, unsigned short port, addrinfo **addr, int sockettype)
{
addrinfo hints;
memset(&hints,0,sizeof(hints));
hints.ai_family = PF_UNSPEC;
if (hostname)
hints.ai_flags = AI_NUMERICHOST;
else
hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE;
hints.ai_socktype = sockettype;
char portString[32] = {0};
sprintf(portString, "%u", (unsigned int)port);
if (getaddrinfo(hostname, portString, &hints, addr) == 0)
{
return 0;
}
else
{
hints.ai_flags = 0;
if (getaddrinfo(hostname, portString, &hints, addr) == 0)
{
return 0;
}
else
{
return -1;
}
}
}
#ifdef _WIN32
unsigned long WINAPI JNL_AsyncDNS::_threadfunc(LPVOID _d)
#else
unsigned int JNL_AsyncDNS::_threadfunc(void *_d)
#endif
{
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)
{
addrinfo *res=0;
if (resolvenow(_this->m_cache[x].hostname, _this->m_cache[x].port, &res, _this->m_cache[x].sockettype) == 0)
{
_this->m_cache[x].addr=res;
}
else
{
_this->m_cache[x].addr=0;//INADDR_NONE;
}
}
else if (_this->m_cache[x].mode==1)
{
/*
hostent *ent;
// TODO: replace with getnameinfo for IPv6
ent=gethostbyaddr((const char *)&_this->m_cache[x].addr,4,AF_INET);
if (ent)
lstrcpyn(_this->m_cache[x].hostname, ent->h_name, 256);
else
_this->m_cache[x].hostname[0]=0;
*/
}
_this->m_cache[x].resolved=true;
}
else
{
if (_this->m_cache[x].mode==0)
{
_this->m_cache[x].addr=0;//INADDR_NONE;
_this->m_cache[x].resolved=true;
}
else if (_this->m_cache[x].mode==1)
{
_this->m_cache[x].hostname[0]=0;
_this->m_cache[x].resolved=true;
}
}
}
}
if (!nowinsock) JNL::close_socketlib();
_this->m_thread_kill=1;
return 0;
}
int JNL_AsyncDNS::resolve(const char *hostname, unsigned short port, addrinfo **addr, int sockettype)
{
// return 0 on success, 1 on wait, -1 on unresolvable
int x;
for (x = 0; x < m_cache_size; x ++)
{
if (!strcasecmp(m_cache[x].hostname,hostname) && port == m_cache[x].port && m_cache[x].mode==0 && m_cache[x].sockettype==sockettype)
{
m_cache[x].last_used=time(0);
if (m_cache[x].resolved)
{
if (m_cache[x].addr == 0)//INADDR_NONE)
{
return DNS_RESOLVE_UNRESOLVABLE;
}
*addr =m_cache[x].addr;
return DNS_RESOLVE_SUCCESS;
}
makesurethreadisrunning();
return DNS_RESOLVE_WAIT;
}
}
// 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 DNS_RESOLVE_UNRESOLVABLE;
}
#ifdef _WIN32
StringCchCopyA(m_cache[oi].hostname, 256, hostname);
#elif defined(__APPLE__)
strlcpy(m_cache[oi].hostname, hostname, 255);
#else
strncpy(m_cache[oi].hostname, hostname, 255);
m_cache[oi].hostname[255]=0;
#endif
m_cache[oi].port=port;
m_cache[oi].mode=0;
m_cache[oi].addr=0;//INADDR_NONE;
m_cache[oi].resolved=false;
m_cache[oi].last_used=time(0);
m_cache[oi].sockettype=sockettype;
makesurethreadisrunning();
return DNS_RESOLVE_WAIT;
}
/*
int JNL_AsyncDNS::reverse(unsigned long addr, char *hostname, size_t hostnameSize)
{
// return 0 on success, 1 on wait, -1 on unresolvable
int x;
if (addr == INADDR_NONE)
{
return DNS_REVERSE_UNRESOLVABLE;
}
#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(0);
if (m_cache[x].resolved)
{
if (!m_cache[x].hostname[0])
{
return DNS_REVERSE_UNRESOLVABLE;
}
lstrcpyn(hostname,m_cache[x].hostname, hostnameSize);
return DNS_REVERSE_SUCCESS;
}
makesurethreadisrunning();
return DNS_REVERSE_WAIT;
}
}
// 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 DNS_REVERSE_UNRESOLVABLE;
}
m_cache[oi].addr=addr;
m_cache[oi].hostname[0]=0;
m_cache[oi].resolved=false;
m_cache[oi].mode=1;
m_cache[oi].last_used=time(0);
makesurethreadisrunning();
return DNS_REVERSE_WAIT;
#else
return DNS_REVERSE_UNRESOLVABLE;
#endif
}
*/
void JNL_AsyncDNS::makesurethreadisrunning(void)
{
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;
}
}
}
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