Added more detail to dns message class

src/zutil/net/dns/DNSPacket.java

@@ -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 OPCODE_QUERY = 0;
-    public static final int FLAG_RESPONSE = 0x84_00;
+    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;
+    //////////////// FLAGS
-    @BinaryField(index=3, length=16)
+    //@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