#ifndef _DNS_H_#define _DNS_H_#include <netdb.h>#include <netinet/in.h>typedef struct {	char *name;	struct in_addr in;  struct in_addr *addr_list[2];	struct hostent h;} DNS_CACHE;typedef struct {	const char *name;	unsigned char ns[4];	int s;	unsigned char addr[4];} DNS_CONTEXT;typedef enum {	DNS_QUERY=0,	DNS_IQUERY=1,	DNS_STATUS=2} DNS_OPCODE;/** Request / response type codes */typedef enum {	DNS_T_A=1,	/** host address */	DNS_T_NS=2,	/** authoritive nameserver */	DNS_T_MD=3,	/** mail destination (obsolete, use MX) */	DNS_T_MF=4,	/** mail forwarder (obsolete, use MX) */	DNS_T_CNAME=5,	/** cannonical name (alias) */	DNS_T_SOA=6,	/** start zone of authority */	DNS_T_MB=7,	/** mailbox domain name (experimental) */	DNS_T_MG=8,	/** mail group member destination (experimental) */	DNS_T_MR=9,	/** mail rename domain name (experimental) */	DNS_T_NULL=10,	/** (experimental) */	DNS_T_WKS=11,	/** well known service description */	DNS_T_PTR=12,	/** domain name pointer */	DNS_T_HINFO=13,	/** host information */	DNS_T_MINFO=14,	/** mailbox info*/	DNS_T_MX=15,	/** mail exchange */	DNS_T_TXT=16,	/** text strings */} DNS_T_TYPE;typedef enum {	DNSF_QUERY=(1<<15),	DNSF_AUTHORITIVE_ANSWER=(1<<11),	DNSF_RECURSIVE=(1<<10),	DNSF_RECURSIVE_AVAILABLE=(1<<9),} DNS_FLAGS;typedef struct{	unsigned short id;	unsigned short flags;	unsigned short questionCount;	unsigned short answerCount;	unsigned short authorityCount;	unsigned short additionalCount;} DNS_HEADER;#if defined(_LANGUAGE_C_PLUS_PLUS)||defined(__cplusplus)||defined(c_plusplus)extern "C" {#endifextern void setNameServer(const char *ns1, const char *ns2);extern struct hostent *gethostbyaddr(const char *addr, int len, int type);extern struct hostent *gethostbyname(const char *name);extern void dns_init(void);#if defined(_LANGUAGE_C_PLUS_PLUS)||defined(__cplusplus)||defined(c_plusplus)}#endif#define resolvInit dns_init#endif