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