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Added more detail to dns message class

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Ziver Koc 2016-02-10 14:22:40 +01:00
parent bd05478750
commit 67f0c66545
1 changed files with 105 additions and 10 deletions
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115
src/zutil/net/dns/DNSPacket.java
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@ -31,25 +31,120 @@ import zutil.parser.binary.BinaryStruct.*;
* Created by Ziver on 2016-02-09.
*/
public class DNSPacket implements BinaryStruct {
public static final int FLAG_QUERY = 0x00_00;
public static final int FLAG_RESPONSE = 0x84_00;
public static final int OPCODE_QUERY = 0;
public static final int OPCODE_IQUERY = 1;
public static final int OPCODE_STATUS = 2;
public static final int OPCODE_NOTIFY = 4;
public static final int OPCODE_UPDATE = 5;
public static final int RCODE_NO_ERROR = 0;
public static final int RCODE_FORMAT_ERROR = 1;
public static final int RCODE_SERVER_FAILURE = 2;
public static final int RCODE_NAME_ERROR = 3;
public static final int RCODE_NOT_IMPLEMENTED = 4;
public static final int RCODE_REFUSED = 5;
public static final int RCODE_YX_DOMAIN = 6; // A name exists where it should not
public static final int RCODE_YX_RR_SET = 7; // A resource record set exists where it should not
public static final int RCODE_NX_RR_SET = 8; // A resource record set should exist but does not
public static final int RCODE_NOT_AUTH = 9; // Server is not authoritative for the zone
public static final int RCODE_NOT_ZONE = 10; // The name is not in the zone specified in the message
@BinaryField(index=1, length=16)
@BinaryField(index=0, length=16)
int id;
@BinaryField(index=2, length=16)
int flags;
@BinaryField(index=3, length=16)
//////////////// FLAGS
//@BinaryField(index=10, length=16)
//int flags;
/**
* Query/Response Flag.
* Differentiates between queries and responses.
* Set to 0 when the query is generated; changed to 1 when that
* query is changed to a response by a replying server.
*/
@BinaryField(index=10, length=1)
boolean qr;
/**
* Operation Code.
* Specifies the type of query in the message. This field is
* copied unchanged in the response
*/
@BinaryField(index=11, length=4)
int opcode;
/**
* Authoritative Answer Flag
* This bit is set to true in a response to indicate that the server
* that created the response is authoritative for the zone in
* which the domain name specified in the Question section is located
*/
@BinaryField(index=12, length=1)
boolean aa;
/**
* Truncation Flag.
* When set to true, indicates that the message was truncated
* due to its length
*/
@BinaryField(index=13, length=1)
boolean tc;
/**
* Recursion Desired.
* When set in a query, requests that the server receiving the
* query attempt to answer the query recursively, if the server
* supports recursive resolution. The value of this bit is not
* changed in the response.
*/
@BinaryField(index=14, length=1)
boolean rd;
/**
* Recursion Available.
* Set to true to indicate whether the server creating the response
* supports recursive queries.
*/
@BinaryField(index=15, length=1)
boolean ra;
@BinaryField(index=16, length=3)
int reserved;
/**
* Response Code.
*/
@BinaryField(index=17, length=4)
int rCode;
//////////////// COUNTS
/**
* Question Count.
* Specifies the number of questions in the
* Question section of the message.
*/
@BinaryField(index=20, length=16)
int qdCount;
@BinaryField(index=4, length=16)
/**
* Answer Record Count.
* Specifies the number of resource records
* in the Answer section of the message.
*/
@BinaryField(index=21, length=16)
int anCount;
@BinaryField(index=5, length=16)
/**
* Name Server (Authority Record) Count.
* Specifies the number of resource records in the
* Authority section of the message.
*/
@BinaryField(index=22, length=16)
int nsCount;
@BinaryField(index=6, length=16)
/**
* Additional Record Count.
* Specifies the number of resource records in the
* Additional section of the message.
*/
@BinaryField(index=23, length=16)
int arCount;
// REQUEST
//////////////// REQUEST DATA
// char data[?]
// char flag[2] => QTYPE=0x00_01 host address query
// QCLASS=0x00_01 internet query