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  • 大小: 12KB
    文件類型: .zip
    金幣: 2
    下載: 0 次
    發布日期: 2021-05-19
  • 語言: Java
  • 標簽: DNS??

資源簡介

設計一個DNS服務器程序，讀入“域名-IP地址”對照表，當客戶端查詢域名對應的IP地址時，用域名檢索該對照表，三種檢索結果： 檢索結果為ip地址0.0.0.0，則向客戶端返回“域名不存在”的報錯消息（不良網站攔截功能） 檢索結果為普通IP地址，則向客戶返回這個地址（服務器功能） 表中未檢到該域名，則向因特網DNS服務器發出查詢，并將結果返給客戶端（中繼功能） 考慮多個計算機上的客戶端會同時查詢，需要進行消息ID的轉換

資源截圖

代碼片段和文件信息 

package?com.kngxscn.dnsrelay;

public?class?DNSHeader?{
	/**
	?*?DNS?Header
	????0??1??2??3??4??5??6??7??0??1??2??3??4??5??6??7
	??+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
	??|??????????????????????ID???????????????????????|
	??+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
	??|QR|??opcode???|AA|TC|RD|RA|???Z????|???RCODE???|
	??+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
	??|????????????????????QDCOUNT????????????????????|
	??+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
	??|????????????????????ANCOUNT????????????????????|
	??+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
	??|????????????????????NSCOUNT????????????????????|
	??+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
	??|????????????????????ARCOUNT????????????????????|
	??+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
	?*/
	
	/*?會話標識（2字節）*/
	private?short?transID;

	/*?Flags（2字節）*/
	private?short?flags;
	
	/*?QDCOUNT（2字節）*/
	private?short?qdcount;
	
	/*?ANCOUNT（2字節）*/
	private?short?ancount;
	
	/*?NSCOUNT（2字節）*/
	private?short?nscount;
	
	/*?ARCOUNT（2字節）*/
	private?short?arcount;

	public?DNSHeader（）?{}

	public?DNSHeader（short?transID?short?flags?short?qdcount?short?ancount?short?nscount?short?arcount）?{
		this.transID?=?transID;
		this.flags?=?flags;
		this.qdcount?=?qdcount;
		this.ancount?=?ancount;
		this.nscount?=?nscount;
		this.arcount?=?arcount;
	}

	public?short?getTransID（）?{
		return?transID;
	}

	public?void?setTransID（short?transID）?{
		this.transID?=?transID;
	}

	public?short?getFlags（）?{
		return?flags;
	}

	public?void?setFlags（short?flags）?{
		this.flags?=?flags;
	}

	public?short?getQdcount（）?{
		return?qdcount;
	}

	public?void?setQdcount（short?qdcount）?{
		this.qdcount?=?qdcount;
	}

	public?short?getAncount（）?{
		return?ancount;
	}

	public?void?setAncount（short?ancount）?{
		this.ancount?=?ancount;
	}

	public?short?getNscount（）?{
		return?nscount;
	}

	public?void?setNscount（short?nscount）?{
		this.nscount?=?nscount;
	}

	public?short?getArcount（）?{
		return?arcount;
	}

	public?void?setArcount（short?arcount）?{
		this.arcount?=?arcount;
	}

????/**
?????*?輸出包含DNS協議頭所有信息的字節數組
?????*/
????public?byte[]?toByteArray（）?{
	????byte[]?data?=?new?byte[12];
	????int?offset?=?0;
	????byte[]?byte_2?=?new?byte[2];
	????byte_2?=?Utils.shortToByteArray（transID）;
	????for?（int?i=0;?i<2;?i++）?{
	????????data[offset++]?=?byte_2[i];
????????}
????????byte_2?=?Utils.shortToByteArray（flags）;
????????for?（int?i=0;?i<2;?i++）?{
????????????data[offset++]?=?byte_2[i];
????????}
????????byte_2?=?Utils.shortToByteArray（qdcount）;
????????for?（int?i=0;?i<2;?i++）?{
????????????data[offset++]?=?byte_2[i];
????????}
????????byte_2?=?Utils.shortToByteArray（ancount）;
????????for?（int?i=0;?i<2;?i++）?{
????????????data[offset++]?=?byte_2[i];
????????}
????????byte_2?=?Utils.shortToByteArray（nscount）;
????????for?（int?i=0;?i<2;?i++）?{
????????????data[offset++]?=?byte_2[i];
????????}
????????byte_2?=?Utils.shortToByteArray（arcount）;
????????for?（int?i=0;?i<2;?i++）?{

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\
?????文件?????????562??2017-12-11?13:43??dnsrelay-master\README.md
?????文件??????????81??2017-12-11?13:43??dnsrelay-master\dnsrelay.txt
?????文件?????????758??2017-12-11?13:43??dnsrelay-master\pom.xml
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\main\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\main\java\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\main\java\com\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\dnsrelay\
?????文件????????3168??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\dnsrelay\DNSHeader.java
?????文件????????1860??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\dnsrelay\DNSQuestion.java
?????文件????????3443??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\dnsrelay\DNSRR.java
?????文件????????2440??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\dnsrelay\DNSRelayServer.java
?????文件????????7698??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\dnsrelay\QueryParser.java
?????文件????????4818??2017-12-11?13:43??dnsrelay-master\src\main\java\com\kngxscn\dnsrelay\Utils.java
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\test\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\test\java\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\test\java\com\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\test\java\com\kngxscn\
?????目錄???????????0??2017-12-11?13:43??dnsrelay-master\src\test\java\com\kngxscn\dnsrelay\
?????文件?????????674??2017-12-11?13:43??dnsrelay-master\src\test\java\com\kngxscn\dnsrelay\DNSRelayServerTest.java
?????文件?????????577??2017-12-11?13:43??dnsrelay-master\src\test\java\com\kngxscn\dnsrelay\UtilsTest.java

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