77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
/*
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** JNetLib
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** Copyright (C) 2008 Cockos Inc
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** Copyright (C) 2000-2001 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 <time.h>
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#ifndef JNL_NO_DEFINE_INTERFACES
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class JNL_IAsyncDNS
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{
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public:
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virtual ~JNL_IAsyncDNS() { }
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virtual int resolve(const char *hostname, unsigned int *addr)=0; // return 0 on success, 1 on wait, -1 on unresolvable
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virtual int reverse(unsigned int addr, char *hostname)=0; // return 0 on success, 1 on wait, -1 on unresolvable. hostname must be at least 256 bytes.
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};
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#define JNL_AsyncDNS_PARENTDEF : public JNL_IAsyncDNS
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#else
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#define JNL_IAsyncDNS JNL_AsyncDNS
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#define JNL_AsyncDNS_PARENTDEF
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#endif
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#ifndef JNL_NO_IMPLEMENTATION
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class JNL_AsyncDNS JNL_AsyncDNS_PARENTDEF
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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 int *addr); // return 0 on success, 1 on wait, -1 on unresolvable
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int reverse(unsigned int addr, char *hostname); // 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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typedef struct
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{
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time_t last_used; // timestamp.
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char resolved;
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char mode; // 1=reverse
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char hostname[256];
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unsigned int addr;
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}
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cache_entry;
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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 WINAPI _threadfunc(void *_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 // !JNL_NO_IMPLEMENTATION
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#endif //_ASYNCDNS_H_
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