diff options
Diffstat (limited to '')
| -rw-r--r-- | src/main/java/de/measite/minidns/DNSCache.java | 11 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/Question.java | 60 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/Record.java | 8 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/record/A.java | 6 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/record/AAAA.java | 6 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/record/CNAME.java | 6 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/record/Data.java | 18 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/record/NS.java | 3 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/record/SRV.java | 54 | ||||
| -rw-r--r-- | src/main/java/de/measite/minidns/util/NameUtil.java | 40 |
10 files changed, 205 insertions, 7 deletions
diff --git a/src/main/java/de/measite/minidns/DNSCache.java b/src/main/java/de/measite/minidns/DNSCache.java index 78e6c041f..14a3a7769 100644 --- a/src/main/java/de/measite/minidns/DNSCache.java +++ b/src/main/java/de/measite/minidns/DNSCache.java @@ -5,8 +5,19 @@ package de.measite.minidns; */ public interface DNSCache { + /** + * Add an an dns answer/response for a given dns question. Implementations + * should honor the ttl / receive timestamp. + * @param q The question. + * @param message The dns message. + */ void put(Question q, DNSMessage message); + /** + * Request a cached dns response. + * @param q The dns question. + * @return The dns message. + */ DNSMessage get(Question q); } diff --git a/src/main/java/de/measite/minidns/Question.java b/src/main/java/de/measite/minidns/Question.java index 8efe19f11..628622510 100644 --- a/src/main/java/de/measite/minidns/Question.java +++ b/src/main/java/de/measite/minidns/Question.java @@ -4,39 +4,89 @@ import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; +import java.util.Arrays; import de.measite.minidns.Record.CLASS; import de.measite.minidns.Record.TYPE; import de.measite.minidns.util.NameUtil; +/** + * A DNS question (request). + */ public class Question { + /** + * The question string (e.g. "measite.de"). + */ private final String name; + /** + * The question type (e.g. A). + */ private final TYPE type; + /** + * The question class (usually IN / internet). + */ private final CLASS clazz; + /** + * Cache for the serialized object. + */ private byte[] byteArray; + /** + * Create a dns question for the given name/type/class. + * @param name The name e.g. "measite.de". + * @param type The type, e.g. A. + * @param clazz The class, usually IN (internet). + */ public Question(String name, TYPE type, CLASS clazz) { this.name = name; this.type = type; this.clazz = clazz; } + /** + * Create a dns question for the given name/type/IN (internet class). + * @param name The name e.g. "measite.de". + * @param type The type, e.g. A. + */ + public Question(String name, TYPE type) { + this(name, type, CLASS.IN); + } + + /** + * Retrieve the type of this question. + * @return The type. + */ public TYPE getType() { return type; } + /** + * Retrieve the class of this dns question (usually internet). + * @return The class of this dns question. + */ public CLASS getClazz() { return clazz; } + /** + * Retrieve the name of this dns question (e.g. "measite.de"). + * @return The name of this dns question. + */ public String getName() { return name; } + /** + * Parse a byte array and rebuild the dns question from it. + * @param dis The input stream. + * @param data The plain data (for dns name references). + * @return The parsed dns question. + * @throws IOException On errors (read outside of packet). + */ public static Question parse(DataInputStream dis, byte[] data) throws IOException { String name = NameUtil.parse(dis, data); TYPE type = TYPE.getType(dis.readUnsignedShort()); @@ -44,6 +94,10 @@ public class Question { return new Question (name, type, clazz); } + /** + * Generate a binary paket for this dns question. + * @return The dns question. + */ public byte[] toByteArray() { if (byteArray == null) { ByteArrayOutputStream baos = new ByteArrayOutputStream(512); @@ -65,7 +119,7 @@ public class Question { @Override public int hashCode() { - return toByteArray().hashCode(); + return Arrays.hashCode(toByteArray()); } @Override @@ -76,6 +130,8 @@ public class Question { if (!(other instanceof Question)) { return false; } - return this.hashCode() == other.hashCode(); + byte t[] = toByteArray(); + byte o[] = ((Question)other).toByteArray(); + return Arrays.equals(t, o); } } diff --git a/src/main/java/de/measite/minidns/Record.java b/src/main/java/de/measite/minidns/Record.java index fb0b5d5f6..36d3db1a3 100644 --- a/src/main/java/de/measite/minidns/Record.java +++ b/src/main/java/de/measite/minidns/Record.java @@ -286,10 +286,18 @@ public class Record { (q.getName().equals(name)); } + /** + * The generic record name, e.g. "measite.de". + * @return The record name. + */ public String getName() { return name; } + /** + * The payload data, usually a subclass of data (A, AAAA, CNAME, ...). + * @return The payload data. + */ public Data getPayload() { return payloadData; } diff --git a/src/main/java/de/measite/minidns/record/A.java b/src/main/java/de/measite/minidns/record/A.java index a85a7af0d..4311c651e 100644 --- a/src/main/java/de/measite/minidns/record/A.java +++ b/src/main/java/de/measite/minidns/record/A.java @@ -5,8 +5,14 @@ import java.io.IOException; import de.measite.minidns.Record.TYPE; +/** + * A record payload (ip pointer). + */ public class A implements Data { + /** + * Target IP. + */ private byte[] ip; @Override diff --git a/src/main/java/de/measite/minidns/record/AAAA.java b/src/main/java/de/measite/minidns/record/AAAA.java index d89147b2c..e4fd5ecf8 100644 --- a/src/main/java/de/measite/minidns/record/AAAA.java +++ b/src/main/java/de/measite/minidns/record/AAAA.java @@ -5,8 +5,14 @@ import java.io.IOException; import de.measite.minidns.Record.TYPE; +/** + * AAAA payload (an ipv6 pointer). + */ public class AAAA implements Data { + /** + * The ipv6 address. + */ private byte[] ip; @Override diff --git a/src/main/java/de/measite/minidns/record/CNAME.java b/src/main/java/de/measite/minidns/record/CNAME.java index 4657b4a51..1ac278141 100644 --- a/src/main/java/de/measite/minidns/record/CNAME.java +++ b/src/main/java/de/measite/minidns/record/CNAME.java @@ -6,6 +6,9 @@ import java.io.IOException; import de.measite.minidns.Record.TYPE; import de.measite.minidns.util.NameUtil; +/** + * CNAME payload (pointer to another domain / address). + */ public class CNAME implements Data { protected String name; @@ -20,8 +23,7 @@ public class CNAME implements Data { @Override public byte[] toByteArray() { - // TODO Auto-generated method stub - return null; + throw new UnsupportedOperationException("Not implemented yet"); } @Override diff --git a/src/main/java/de/measite/minidns/record/Data.java b/src/main/java/de/measite/minidns/record/Data.java index 9cb803742..7f2db03a1 100644 --- a/src/main/java/de/measite/minidns/record/Data.java +++ b/src/main/java/de/measite/minidns/record/Data.java @@ -5,12 +5,30 @@ import java.io.IOException; import de.measite.minidns.Record.TYPE; +/** + * Generic payload class. + */ public interface Data { + /** + * The payload type. + * @return The payload type. + */ TYPE getType(); + /** + * Binary representation of this payload. + * @return The binary representation of this payload. + */ byte[] toByteArray(); + /** + * Parse this payload. + * @param dis The input stream. + * @param data The plain data (needed for name cross references). + * @param length The payload length. + * @throws IOException on io error (read past paket boundary). + */ void parse(DataInputStream dis, byte data[], int length) throws IOException; } diff --git a/src/main/java/de/measite/minidns/record/NS.java b/src/main/java/de/measite/minidns/record/NS.java index bf07e8c41..8ac2d4c34 100644 --- a/src/main/java/de/measite/minidns/record/NS.java +++ b/src/main/java/de/measite/minidns/record/NS.java @@ -2,6 +2,9 @@ package de.measite.minidns.record; import de.measite.minidns.Record.TYPE; +/** + * Nameserver record. + */ public class NS extends CNAME { @Override diff --git a/src/main/java/de/measite/minidns/record/SRV.java b/src/main/java/de/measite/minidns/record/SRV.java index 32b70c4d3..707bf3f58 100644 --- a/src/main/java/de/measite/minidns/record/SRV.java +++ b/src/main/java/de/measite/minidns/record/SRV.java @@ -6,49 +6,99 @@ import java.io.IOException; import de.measite.minidns.Record.TYPE; import de.measite.minidns.util.NameUtil; +/** + * SRV record payload (service pointer). + */ public class SRV implements Data { + /** + * The priority of this service. + */ protected int priority; + + /** + * The weight of this service. + */ protected int weight; + + /** + * The target port. + */ protected int port; + + /** + * The target server. + */ protected String name; + /** + * The priority of this service. Lower values mean higher priority. + * @return The priority. + */ public int getPriority() { return priority; } + /** + * Set the priority of this service entry. Lower values have higher priority. + * @param priority The new priority. + */ public void setPriority(int priority) { this.priority = priority; } + /** + * The weight of this service. Services with the same priority should be + * balanced based on weight. + * @return The weight of this service. + */ public int getWeight() { return weight; } + /** + * Set the weight of this service. + * @param weight The new weight of this service. + */ public void setWeight(int weight) { this.weight = weight; } + /** + * The target port of this service. + * @return The target port of this service. + */ public int getPort() { return port; } + /** + * Set the target port of this service. + * @param port The new target port. + */ public void setPort(int port) { this.port = port; } + /** + * The name of the target server. + * @return The target servers name. + */ public String getName() { return name; } + /** + * Set the name of the target server. + * @param name The new target servers name. + */ public void setName(String name) { this.name = name; } @Override public byte[] toByteArray() { - // TODO Auto-generated method stub - return null; + throw new UnsupportedOperationException("Not implemented yet"); } @Override diff --git a/src/main/java/de/measite/minidns/util/NameUtil.java b/src/main/java/de/measite/minidns/util/NameUtil.java index 91a6649d8..7ae373bcd 100644 --- a/src/main/java/de/measite/minidns/util/NameUtil.java +++ b/src/main/java/de/measite/minidns/util/NameUtil.java @@ -8,12 +8,28 @@ import java.net.IDN; import java.util.HashSet; import java.util.Arrays; +/** + * Utilities related to internationalized domain names and dns name handling. + */ public class NameUtil { + /** + * Retrieve the rough binary length of a string + * (length + 2 bytes length prefix). + * @param name The name string. + * @return The binary size of the string (length + 2). + */ public static int size(String name) { return name.length() + 2; } + /** + * Check if two internationalized domain names are equal, possibly causing + * a serialization of both domain names. + * @param name1 The first domain name. + * @param name2 The second domain name. + * @return True if both domain names are the same. + */ public static boolean idnEquals(String name1, String name2) { if (name1 == name2) return true; // catches null, null if (name1 == null) return false; @@ -27,6 +43,12 @@ public class NameUtil { } } + /** + * Serialize a domain name under IDN rules. + * @param name The domain name. + * @return The binary domain name representation. + * @throws IOException Should never happen. + */ public static byte[] toByteArray(String name) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(64); DataOutputStream dos = new DataOutputStream(baos); @@ -38,8 +60,16 @@ public class NameUtil { dos.writeByte(0); dos.flush(); return baos.toByteArray(); - } + } + /** + * Parse a domain name starting at the current offset and moving the input + * stream pointer past this domain name (even if cross references occure). + * @param dis The input stream. + * @param data The raw data (for cross references). + * @return The domain name string. + * @throws IOException Should never happen. + */ public static String parse(DataInputStream dis, byte data[]) throws IOException { @@ -63,6 +93,14 @@ public class NameUtil { return s; } + /** + * Parse a domain name starting at the given offset. + * @param data The raw data. + * @param offset The offset. + * @param jumps The list of jumps (by now). + * @return The parsed domain name. + * @throws IllegalStateException on cycles. + */ public static String parse( byte data[], int offset, |