winamp/Src/replicant/jnetlib/asyncdns.h

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2024-09-24 12:54:57 +00:00
/*
** JNetLib
** Copyright (C) 2000-2007 Nullsoft, Inc.
** Author: Justin Frankel
** File: asyncdns.h - JNL portable asynchronous DNS interface
** License: see jnetlib.h
**
** Usage:
** 1. Create JNL_AsyncDNS object, optionally with the number of cache entries.
** 2. call resolve() to resolve a hostname into an address. The return value of
** resolve is 0 on success (host successfully resolved), 1 on wait (meaning
** try calling resolve() with the same hostname in a few hundred milliseconds
** or so), or -1 on error (i.e. the host can't resolve).
** 3. call reverse() to do reverse dns (ala resolve()).
** 4. enjoy.
*/
#ifndef _ASYNCDNS_H_
#define _ASYNCDNS_H_
#include "netinc.h"
struct cache_entry;
#define JNL_AUTODNS ((JNL_AsyncDNS *)-1)
enum
{
DNS_RESOLVE_UNRESOLVABLE = -1,
DNS_RESOLVE_SUCCESS = 0,
DNS_RESOLVE_WAIT = 1,
};
enum
{
DNS_REVERSE_UNRESOLVABLE = -1,
DNS_REVERSE_SUCCESS = 0,
DNS_REVERSE_WAIT = 1,
};
class JNL_AsyncDNS
{
public:
JNL_AsyncDNS( int max_cache_entries = 64 );
~JNL_AsyncDNS();
int resolve( const char *hostname, unsigned short port, addrinfo **addr, int sockettype ); // return 0 on success, 1 on wait, -1 on unresolvable
static int resolvenow( const char *hostname, unsigned short port, addrinfo **addr, int sockettype ); // return 0 on success, -1 on unresolvable
//int reverse(unsigned long addr, char *hostname, size_t hostnameSize); // return 0 on success, 1 on wait, -1 on unresolvable. hostname must be at least 256 bytes.
private:
cache_entry *m_cache;
int m_cache_size;
volatile int m_thread_kill;
#ifdef _WIN32
HANDLE m_thread;
static unsigned long WINAPI _threadfunc( LPVOID _d );
#else
pthread_t m_thread;
static unsigned int _threadfunc( void *_d );
#endif
void makesurethreadisrunning( void );
};
#endif //_ASYNCDNS_H_