Initial community commit

Src/replicant/jnetlib/asyncdns.h

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+/*
+** 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_