diff options
Diffstat (limited to 'libs/minidns/src/main/java')
15 files changed, 0 insertions, 2034 deletions
diff --git a/libs/minidns/src/main/java/de/measite/minidns/Client.java b/libs/minidns/src/main/java/de/measite/minidns/Client.java deleted file mode 100644 index 827aa772..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/Client.java +++ /dev/null @@ -1,323 +0,0 @@ -package de.measite.minidns; - -import java.io.IOException; -import java.io.InputStream; -import java.io.InputStreamReader; -import java.io.LineNumberReader; -import java.lang.reflect.Method; -import java.net.DatagramPacket; -import java.net.DatagramSocket; -import java.net.InetAddress; -import java.security.NoSuchAlgorithmException; -import java.security.SecureRandom; -import java.util.ArrayList; -import java.util.Arrays; -import java.util.HashSet; -import java.util.Random; -import java.util.logging.Level; -import java.util.logging.Logger; - -import de.measite.minidns.Record.CLASS; -import de.measite.minidns.Record.TYPE; - -/** - * A minimal DNS client for SRV/A/AAAA/NS and CNAME lookups, with IDN support. - * This circumvents the missing javax.naming package on android. - */ -public class Client { - - private static final Logger LOGGER = Logger.getLogger(Client.class.getName()); - - /** - * The internal random class for sequence generation. - */ - protected Random random; - - /** - * The buffer size for dns replies. - */ - protected int bufferSize = 1500; - - /** - * DNS timeout. - */ - protected int timeout = 5000; - - /** - * The internal DNS cache. - */ - protected DNSCache cache; - - /** - * Create a new DNS client with the given DNS cache. - * @param cache The backend DNS cache. - */ - public Client(DNSCache cache) { - try { - random = SecureRandom.getInstance("SHA1PRNG"); - } catch (NoSuchAlgorithmException e1) { - random = new SecureRandom(); - } - this.cache = cache; - } - - /** - * Create a new DNS client. - */ - public Client() { - this(null); - } - - /** - * Query a nameserver for a single entry. - * @param name The DNS name to request. - * @param type The DNS type to request (SRV, A, AAAA, ...). - * @param clazz The class of the request (usually IN for Internet). - * @param host The DNS server host. - * @param port The DNS server port. - * @return The response (or null on timeout / failure). - * @throws IOException On IO Errors. - */ - public DNSMessage query(String name, TYPE type, CLASS clazz, String host, int port) - throws IOException - { - Question q = new Question(name, type, clazz); - return query(q, host, port); - } - - /** - * Query a nameserver for a single entry. - * @param name The DNS name to request. - * @param type The DNS type to request (SRV, A, AAAA, ...). - * @param clazz The class of the request (usually IN for Internet). - * @param host The DNS server host. - * @return The response (or null on timeout / failure). - * @throws IOException On IO Errors. - */ - public DNSMessage query(String name, TYPE type, CLASS clazz, String host) - throws IOException - { - Question q = new Question(name, type, clazz); - return query(q, host); - } - - /** - * Query the system nameserver for a single entry. - * @param name The DNS name to request. - * @param type The DNS type to request (SRV, A, AAAA, ...). - * @param clazz The class of the request (usually IN for Internet). - * @return The response (or null on timeout/error). - * @return The DNSMessage reply or null. - */ - public DNSMessage query(String name, TYPE type, CLASS clazz) - { - Question q = new Question(name, type, clazz); - return query(q); - } - - /** - * Query a specific server for one entry. - * @param q The question section of the DNS query. - * @param host The dns server host. - * @return The response (or null on timeout/error). - * @throws IOException On IOErrors. - */ - public DNSMessage query(Question q, String host) throws IOException { - return query(q, host, 53); - } - - /** - * Query a specific server for one entry. - * @param q The question section of the DNS query. - * @param host The dns server host. - * @param port the dns port. - * @return The response (or null on timeout/error). - * @throws IOException On IOErrors. - */ - public DNSMessage query(Question q, String host, int port) throws IOException { - DNSMessage dnsMessage = (cache == null) ? null : cache.get(q); - if (dnsMessage != null) { - return dnsMessage; - } - DNSMessage message = new DNSMessage(); - message.setQuestions(new Question[]{q}); - message.setRecursionDesired(true); - message.setId(random.nextInt()); - byte[] buf = message.toArray(); - try (DatagramSocket socket = new DatagramSocket()) { - DatagramPacket packet = new DatagramPacket(buf, buf.length, - InetAddress.getByName(host), port); - socket.setSoTimeout(timeout); - socket.send(packet); - packet = new DatagramPacket(new byte[bufferSize], bufferSize); - socket.receive(packet); - dnsMessage = DNSMessage.parse(packet.getData()); - if (dnsMessage.getId() != message.getId()) { - return null; - } - for (Record record : dnsMessage.getAnswers()) { - if (record.isAnswer(q)) { - if (cache != null) { - cache.put(q, dnsMessage); - } - break; - } - } - return dnsMessage; - } - } - - /** - * Query the system DNS server for one entry. - * @param q The question section of the DNS query. - * @return The response (or null on timeout/error). - */ - public DNSMessage query(Question q) { - // While this query method does in fact re-use query(Question, String) - // we still do a cache lookup here in order to avoid unnecessary - // findDNS()calls, which are expensive on Android. Note that we do not - // put the results back into the Cache, as this is already done by - // query(Question, String). - DNSMessage message = cache.get(q); - if (message != null) { - return message; - } - String dnsServer[] = findDNS(); - for (String dns : dnsServer) { - try { - message = query(q, dns); - if (message == null) { - continue; - } - if (message.getResponseCode() != - DNSMessage.RESPONSE_CODE.NO_ERROR) { - continue; - } - for (Record record: message.getAnswers()) { - if (record.isAnswer(q)) { - return message; - } - } - } catch (IOException ioe) { - LOGGER.log(Level.FINE, "IOException in query", ioe); - } - } - return null; - } - - /** - * Retrieve a list of currently configured DNS servers. - * @return The server array. - */ - public String[] findDNS() { - String[] result = findDNSByReflection(); - if (result != null) { - LOGGER.fine("Got DNS servers via reflection: " + Arrays.toString(result)); - return result; - } - - result = findDNSByExec(); - if (result != null) { - LOGGER.fine("Got DNS servers via exec: " + Arrays.toString(result)); - return result; - } - - // fallback for ipv4 and ipv6 connectivity - // see https://developers.google.com/speed/public-dns/docs/using - LOGGER.fine("No DNS found? Using fallback [8.8.8.8, [2001:4860:4860::8888]]"); - - return new String[]{"8.8.8.8", "[2001:4860:4860::8888]"}; - } - - /** - * Try to retrieve the list of dns server by executing getprop. - * @return Array of servers, or null on failure. - */ - protected String[] findDNSByExec() { - try { - Process process = Runtime.getRuntime().exec("getprop"); - InputStream inputStream = process.getInputStream(); - LineNumberReader lnr = new LineNumberReader( - new InputStreamReader(inputStream)); - String line = null; - HashSet<String> server = new HashSet<String>(6); - while ((line = lnr.readLine()) != null) { - int split = line.indexOf("]: ["); - if (split == -1) { - continue; - } - String property = line.substring(1, split); - String value = line.substring(split + 4, line.length() - 1); - if (property.endsWith(".dns") || property.endsWith(".dns1") || - property.endsWith(".dns2") || property.endsWith(".dns3") || - property.endsWith(".dns4")) { - - // normalize the address - - InetAddress ip = InetAddress.getByName(value); - - if (ip == null) continue; - - value = ip.getHostAddress(); - - if (value == null) continue; - if (value.length() == 0) continue; - - server.add(value); - } - } - if (server.size() > 0) { - return server.toArray(new String[server.size()]); - } - } catch (IOException e) { - LOGGER.log(Level.WARNING, "Exception in findDNSByExec", e); - } - return null; - } - - /** - * Try to retrieve the list of dns server by calling SystemProperties. - * @return Array of servers, or null on failure. - */ - protected String[] findDNSByReflection() { - try { - Class<?> SystemProperties = - Class.forName("android.os.SystemProperties"); - Method method = SystemProperties.getMethod("get", - new Class[] { String.class }); - - ArrayList<String> servers = new ArrayList<String>(5); - - for (String propKey : new String[] { - "net.dns1", "net.dns2", "net.dns3", "net.dns4"}) { - - String value = (String)method.invoke(null, propKey); - - if (value == null) continue; - if (value.length() == 0) continue; - if (servers.contains(value)) continue; - - InetAddress ip = InetAddress.getByName(value); - - if (ip == null) continue; - - value = ip.getHostAddress(); - - if (value == null) continue; - if (value.length() == 0) continue; - if (servers.contains(value)) continue; - - servers.add(value); - } - - if (servers.size() > 0) { - return servers.toArray(new String[servers.size()]); - } - } catch (Exception e) { - // we might trigger some problems this way - LOGGER.log(Level.WARNING, "Exception in findDNSByReflection", e); - } - return null; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/DNSCache.java b/libs/minidns/src/main/java/de/measite/minidns/DNSCache.java deleted file mode 100644 index 14a3a776..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/DNSCache.java +++ /dev/null @@ -1,23 +0,0 @@ -package de.measite.minidns; - -/** - * Cache for DNS Entries. Implementations must be thread safe. - */ -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/libs/minidns/src/main/java/de/measite/minidns/DNSMessage.java b/libs/minidns/src/main/java/de/measite/minidns/DNSMessage.java deleted file mode 100644 index ab2535ce..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/DNSMessage.java +++ /dev/null @@ -1,524 +0,0 @@ -package de.measite.minidns; - -import java.io.ByteArrayInputStream; -import java.io.ByteArrayOutputStream; -import java.io.DataInputStream; -import java.io.DataOutputStream; -import java.io.IOException; -import java.util.Arrays; - -/** - * A DNS message as defined by rfc1035. The message consists of a header and - * 4 sections: question, answer, nameserver and addition resource record - * section. - * A message can either be parsed ({@link DNSMessage#parse(byte[])}) or serialized - * ({@link DNSMessage#toArray()}). - */ -public class DNSMessage { - - /** - * Possible DNS reply codes. - */ - public static enum RESPONSE_CODE { - NO_ERROR(0), FORMAT_ERR(1), SERVER_FAIL(2), NX_DOMAIN(3), - NO_IMP(4), REFUSED(5), YXDOMAIN(6), YXRRSET(7), - NXRRSET(8), NOT_AUTH(9),NOT_ZONE(10); - - /** - * Reverse lookup table for response codes. - */ - private final static RESPONSE_CODE INVERSE_LUT[] = new RESPONSE_CODE[]{ - NO_ERROR, FORMAT_ERR, SERVER_FAIL, NX_DOMAIN, NO_IMP, - REFUSED, YXDOMAIN, YXRRSET, NXRRSET, NOT_AUTH, NOT_ZONE, - null, null, null, null, null - }; - - /** - * The response code value. - */ - private final byte value; - - /** - * Create a new response code. - * @param value The response code value. - */ - private RESPONSE_CODE(int value) { - this.value = (byte)value; - } - - /** - * Retrieve the byte value of the response code. - * @return the response code. - */ - public byte getValue() { - return (byte) value; - } - - /** - * Retrieve the response code for a byte value. - * @param value The byte value. - * @return The symbolic response code or null. - * @throws IllegalArgumentException if the value is not in the range of - * 0..15. - */ - public static RESPONSE_CODE getResponseCode(int value) { - if (value < 0 || value > 15) { - throw new IllegalArgumentException(); - } - return INVERSE_LUT[value]; - } - - }; - - /** - * Symbolic DNS Opcode values. - */ - public static enum OPCODE { - QUERY(0), - INVERSE_QUERY(1), - STATUS(2), - NOTIFY(4), - UPDATE(5); - - /** - * Lookup table for for obcode reolution. - */ - private final static OPCODE INVERSE_LUT[] = new OPCODE[]{ - QUERY, INVERSE_QUERY, STATUS, null, NOTIFY, UPDATE, null, - null, null, null, null, null, null, null, null - }; - - /** - * The value of this opcode. - */ - private final byte value; - - /** - * Create a new opcode for a given byte value. - * @param value The byte value of the opcode. - */ - private OPCODE(int value) { - this.value = (byte)value; - } - - /** - * Retrieve the byte value of this opcode. - * @return The byte value of this opcode. - */ - public byte getValue() { - return value; - } - - /** - * Retrieve the symbolic name of an opcode byte. - * @param value The byte value of the opcode. - * @return The symbolic opcode or null. - * @throws IllegalArgumentException If the byte value is not in the - * range 0..15. - */ - public static OPCODE getOpcode(int value) { - if (value < 0 || value > 15) { - throw new IllegalArgumentException(); - } - return INVERSE_LUT[value]; - } - - }; - - /** - * The DNS message id. - */ - protected int id; - - /** - * The DNS message opcode. - */ - protected OPCODE opcode; - - /** - * The response code of this dns message. - */ - protected RESPONSE_CODE responseCode; - - /** - * True if this is a query. - */ - protected boolean query; - - /** - * True if this is a authorative response. - */ - protected boolean authoritativeAnswer; - - /** - * True on truncate, tcp should be used. - */ - protected boolean truncated; - - /** - * True if the server should recurse. - */ - protected boolean recursionDesired; - - /** - * True if recursion is possible. - */ - protected boolean recursionAvailable; - - /** - * True if the server regarded the response as authentic. - */ - protected boolean authenticData; - - /** - * True if the server should not check the replies. - */ - protected boolean checkDisabled; - - /** - * The question section content. - */ - protected Question questions[]; - - /** - * The answers section content. - */ - protected Record answers[]; - - /** - * The nameserver records. - */ - protected Record nameserverRecords[]; - - /** - * Additional resousrce records. - */ - protected Record additionalResourceRecords[]; - - /** - * The receive timestamp of this message. - */ - protected long receiveTimestamp; - - /** - * Retrieve the current DNS message id. - * @return The current DNS message id. - */ - public int getId() { - return id; - } - - /** - * Set the current DNS message id. - * @param id The new DNS message id. - */ - public void setId(int id) { - this.id = id & 0xffff; - } - - /** - * Get the receive timestamp if this message was created via parse. - * This should be used to evaluate TTLs. - * @return The receive timestamp in milliseconds. - */ - public long getReceiveTimestamp() { - return receiveTimestamp; - } - - /** - * Retrieve the query type (true or false; - * @return True if this DNS message is a query. - */ - public boolean isQuery() { - return query; - } - - /** - * Set the query status of this message. - * @param query The new query status. - */ - public void setQuery(boolean query) { - this.query = query; - } - - /** - * True if the DNS message is an authoritative answer. - * @return True if this an authoritative DNS message. - */ - public boolean isAuthoritativeAnswer() { - return authoritativeAnswer; - } - - /** - * Set the authoritative answer flag. - * @param authoritativeAnswer Tge new authoritative answer value. - */ - public void setAuthoritativeAnswer(boolean authoritativeAnswer) { - this.authoritativeAnswer = authoritativeAnswer; - } - - /** - * Retrieve the truncation status of this message. True means that the - * client should try a tcp lookup. - * @return True if this message was truncated. - */ - public boolean isTruncated() { - return truncated; - } - - /** - * Set the truncation bit on this DNS message. - * @param truncated The new truncated bit status. - */ - public void setTruncated(boolean truncated) { - this.truncated = truncated; - } - - /** - * Check if this message preferes recursion. - * @return True if recursion is desired. - */ - public boolean isRecursionDesired() { - return recursionDesired; - } - - /** - * Set the recursion desired flag on this message. - * @param recursionDesired The new recusrion setting. - */ - public void setRecursionDesired(boolean recursionDesired) { - this.recursionDesired = recursionDesired; - } - - /** - * Retrieve the recursion available flag of this DNS message. - * @return The recursion available flag of this message. - */ - public boolean isRecursionAvailable() { - return recursionAvailable; - } - - /** - * Set the recursion available flog from this DNS message. - * @param recursionAvailable The new recursion available status. - */ - public void setRecursionAvailable(boolean recursionAvailable) { - this.recursionAvailable = recursionAvailable; - } - - /** - * Retrieve the authentic data flag of this message. - * @return The authentic data flag. - */ - public boolean isAuthenticData() { - return authenticData; - } - - /** - * Set the authentic data flag on this DNS message. - * @param authenticData The new authentic data flag value. - */ - public void setAuthenticData(boolean authenticData) { - this.authenticData = authenticData; - } - - /** - * Check if checks are disabled. - * @return The status of the CheckDisabled flag. - */ - public boolean isCheckDisabled() { - return checkDisabled; - } - - /** - * Change the check status of this packet. - * @param checkDisabled The new check disabled value. - */ - public void setCheckDisabled(boolean checkDisabled) { - this.checkDisabled = checkDisabled; - } - - /** - * Generate a binary dns packet out of this message. - * @return byte[] the binary representation. - * @throws IOException Should never happen. - */ - public byte[] toArray() throws IOException { - ByteArrayOutputStream baos = new ByteArrayOutputStream(512); - DataOutputStream dos = new DataOutputStream(baos); - int header = 0; - if (query) { - header += 1 << 15; - } - if (opcode != null) { - header += opcode.getValue() << 11; - } - if (authoritativeAnswer) { - header += 1 << 10; - } - if (truncated) { - header += 1 << 9; - } - if (recursionDesired) { - header += 1 << 8; - } - if (recursionAvailable) { - header += 1 << 7; - } - if (authenticData) { - header += 1 << 5; - } - if (checkDisabled) { - header += 1 << 4; - } - if (responseCode != null) { - header += responseCode.getValue(); - } - dos.writeShort((short)id); - dos.writeShort((short)header); - if (questions == null) { - dos.writeShort(0); - } else { - dos.writeShort((short)questions.length); - } - if (answers == null) { - dos.writeShort(0); - } else { - dos.writeShort((short)answers.length); - } - if (nameserverRecords == null) { - dos.writeShort(0); - } else { - dos.writeShort((short)nameserverRecords.length); - } - if (additionalResourceRecords == null) { - dos.writeShort(0); - } else { - dos.writeShort((short)additionalResourceRecords.length); - } - for (Question question: questions) { - dos.write(question.toByteArray()); - } - dos.flush(); - return baos.toByteArray(); - } - - /** - * Build a DNS Message based on a binary DNS message. - * @param data The DNS message data. - * @return Parsed DNSMessage message. - * @throws IOException On read errors. - */ - public static DNSMessage parse(byte data[]) throws IOException { - ByteArrayInputStream bis = new ByteArrayInputStream(data); - DataInputStream dis = new DataInputStream(bis); - DNSMessage message = new DNSMessage(); - message.id = dis.readUnsignedShort(); - int header = dis.readUnsignedShort(); - message.query = ((header >> 15) & 1) == 0; - message.opcode = OPCODE.getOpcode((header >> 11) & 0xf); - message.authoritativeAnswer = ((header >> 10) & 1) == 1; - message.truncated = ((header >> 9) & 1) == 1; - message.recursionDesired = ((header >> 8) & 1) == 1; - message.recursionAvailable = ((header >> 7) & 1) == 1; - message.authenticData = ((header >> 5) & 1) == 1; - message.checkDisabled = ((header >> 4) & 1) == 1; - message.responseCode = RESPONSE_CODE.getResponseCode(header & 0xf); - message.receiveTimestamp = System.currentTimeMillis(); - int questionCount = dis.readUnsignedShort(); - int answerCount = dis.readUnsignedShort(); - int nameserverCount = dis.readUnsignedShort(); - int additionalResourceRecordCount = dis.readUnsignedShort(); - message.questions = new Question[questionCount]; - while (questionCount-- > 0) { - Question q = Question.parse(dis, data); - message.questions[questionCount] = q; - } - message.answers = new Record[answerCount]; - while (answerCount-- > 0) { - Record rr = new Record(); - rr.parse(dis, data); - message.answers[answerCount] = rr; - } - message.nameserverRecords = new Record[nameserverCount]; - while (nameserverCount-- > 0) { - Record rr = new Record(); - rr.parse(dis, data); - message.nameserverRecords[nameserverCount] = rr; - } - message.additionalResourceRecords = - new Record[additionalResourceRecordCount]; - while (additionalResourceRecordCount-- > 0) { - Record rr = new Record(); - rr.parse(dis, data); - message.additionalResourceRecords[additionalResourceRecordCount] = - rr; - } - return message; - } - - /** - * Set the question part of this message. - * @param questions The questions. - */ - public void setQuestions(Question ... questions) { - this.questions = questions; - } - - /** - * Retrieve the opcode of this message. - * @return The opcode of this message. - */ - public OPCODE getOpcode() { - return opcode; - } - - /** - * Retrieve the response code of this message. - * @return The response code. - */ - public RESPONSE_CODE getResponseCode() { - return responseCode; - } - - /** - * Retrieve the question section of this message. - * @return The DNS question section. - */ - public Question[] getQuestions() { - return questions; - } - - /** - * Retrieve the answer records of this DNS message. - * @return The answer section of this DNS message. - */ - public Record[] getAnswers() { - return answers; - } - - /** - * Retrieve the nameserver records of this DNS message. - * @return The nameserver section of this DNS message. - */ - public Record[] getNameserverRecords() { - return nameserverRecords; - } - - /** - * Retrieve the additional resource records attached to this DNS message. - * @return The additional resource record section of this DNS message. - */ - public Record[] getAdditionalResourceRecords() { - return additionalResourceRecords; - } - - public String toString() { - return "-- DNSMessage " + id + " --\n" + - "Q" + Arrays.toString(questions) + - "NS" + Arrays.toString(nameserverRecords) + - "A" + Arrays.toString(answers) + - "ARR" + Arrays.toString(additionalResourceRecords); - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/LRUCache.java b/libs/minidns/src/main/java/de/measite/minidns/LRUCache.java deleted file mode 100644 index 6b9bbdc1..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/LRUCache.java +++ /dev/null @@ -1,139 +0,0 @@ -package de.measite.minidns; - -import java.util.LinkedHashMap; -import java.util.Map.Entry; - -/** - * LRU based DNSCache backed by a LinkedHashMap. - */ -public class LRUCache implements DNSCache { - - /** - * Internal miss count. - */ - protected long missCount = 0l; - - /** - * Internal expire count (subset of misses that was caused by expire). - */ - protected long expireCount = 0l; - - /** - * Internal hit count. - */ - protected long hitCount = 0l; - - /** - * The internal capacity of the backend cache. - */ - protected int capacity; - - /** - * The upper bound of the ttl. All longer TTLs will be capped by this ttl. - */ - protected long maxTTL; - - /** - * The backend cache. - */ - protected LinkedHashMap<Question, DNSMessage> backend; - - /** - * Create a new LRUCache with given capacity and upper bound ttl. - * @param capacity The internal capacity. - * @param maxTTL The upper bound for any ttl. - */ - @SuppressWarnings("serial") - public LRUCache(final int capacity, final long maxTTL) { - this.capacity = capacity; - this.maxTTL = maxTTL; - backend = new LinkedHashMap<Question,DNSMessage>( - Math.min(capacity + (capacity + 3) / 4 + 2, 11), 0.75f, true) - { - @Override - protected boolean removeEldestEntry( - Entry<Question, DNSMessage> eldest) { - return size() > capacity; - } - }; - } - - /** - * Create a new LRUCache with given capacity. - * @param capacity The capacity of this cache. - */ - public LRUCache(final int capacity) { - this(capacity, Long.MAX_VALUE); - } - - @Override - public synchronized void put(Question q, DNSMessage message) { - if (message.getReceiveTimestamp() <= 0l) { - return; - } - backend.put(q, message); - } - - @Override - public synchronized DNSMessage get(Question q) { - DNSMessage message = backend.get(q); - if (message == null) { - missCount++; - return null; - } - - long ttl = maxTTL; - for (Record r : message.getAnswers()) { - ttl = Math.min(ttl, r.ttl); - } - for (Record r : message.getAdditionalResourceRecords()) { - ttl = Math.min(ttl, r.ttl); - } - if (message.getReceiveTimestamp() + ttl > System.currentTimeMillis()) { - missCount++; - expireCount++; - backend.remove(q); - return null; - } else { - hitCount++; - return message; - } - } - - /** - * Clear all entries in this cache. - */ - public synchronized void clear() { - backend.clear(); - missCount = 0l; - hitCount = 0l; - expireCount = 0l; - } - - /** - * Get the miss count of this cache which is the number of fruitless - * get calls since this cache was last resetted. - * @return The number of cache misses. - */ - public long getMissCount() { - return missCount; - } - - /** - * The number of expires (cache hits that have had a ttl to low to be - * retrieved). - * @return The expire count. - */ - public long getExpireCount() { - return expireCount; - } - - /** - * The cache hit count (all sucessful calls to get). - * @return The hit count. - */ - public long getHitCount() { - return hitCount; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/Question.java b/libs/minidns/src/main/java/de/measite/minidns/Question.java deleted file mode 100644 index 3b2fa1a1..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/Question.java +++ /dev/null @@ -1,158 +0,0 @@ -package de.measite.minidns; - -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; - - /** - * UnicastQueries have the highest bit of the CLASS field set to 1. - */ - private final boolean unicastQuery; - - /** - * 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, boolean unicastQuery) { - this.name = name; - this.type = type; - this.clazz = clazz; - this.unicastQuery = unicastQuery; - } - - /** - * 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, type, clazz, false); - } - - /** - * 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()); - CLASS clazz = CLASS.getClass(dis.readUnsignedShort()); - 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); - DataOutputStream dos = new DataOutputStream(baos); - - try { - dos.write(NameUtil.toByteArray(this.name)); - dos.writeShort(type.getValue()); - dos.writeShort(clazz.getValue() | (unicastQuery ? (1 << 15) : 0)); - dos.flush(); - } catch (IOException e) { - // Should never happen - throw new IllegalStateException(e); - } - byteArray = baos.toByteArray(); - } - return byteArray; - } - - @Override - public int hashCode() { - return Arrays.hashCode(toByteArray()); - } - - @Override - public boolean equals(Object other) { - if (this == other) { - return true; - } - if (!(other instanceof Question)) { - return false; - } - byte t[] = toByteArray(); - byte o[] = ((Question)other).toByteArray(); - return Arrays.equals(t, o); - } - - @Override - public String toString() { - return "Question/" + clazz + "/" + type + ": " + name; - } -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/Record.java b/libs/minidns/src/main/java/de/measite/minidns/Record.java deleted file mode 100644 index ab081426..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/Record.java +++ /dev/null @@ -1,343 +0,0 @@ -package de.measite.minidns; - -import java.io.DataInputStream; -import java.io.IOException; -import java.util.HashMap; -import java.util.logging.Level; -import java.util.logging.Logger; - -import de.measite.minidns.record.A; -import de.measite.minidns.record.AAAA; -import de.measite.minidns.record.CNAME; -import de.measite.minidns.record.Data; -import de.measite.minidns.record.NS; -import de.measite.minidns.record.PTR; -import de.measite.minidns.record.SRV; -import de.measite.minidns.record.TXT; -import de.measite.minidns.util.NameUtil; - -/** - * A generic DNS record. - */ -public class Record { - - private static final Logger LOGGER = Logger.getLogger(Client.class.getName()); - - /** - * The record type. - * @see <a href="http://www.iana.org/assignments/dns-parameters">IANA DNS Parameters</a> - */ - public static enum TYPE { - A(1), - NS(2), - MD(3), - MF(4), - CNAME(5), - SOA(6), - MB(7), - MG(8), - MR(9), - NULL(10), - WKS(11), - PTR(12), - HINFO(13), - MINFO(14), - MX(15), - TXT(16), - RP(17), - AFSDB(18), - X25(19), - ISDN(20), - RT(21), - NSAP(22), - NSAP_PTR(23), - SIG(24), - KEY(25), - PX(26), - GPOS(27), - AAAA(28), - LOC(29), - NXT(30), - EID(31), - NIMLOC(32), - SRV(33), - ATMA(34), - NAPTR(35), - KX(36), - CERT(37), - A6(38), - DNAME(39), - SINK(40), - OPT(41), - APL(42), - DS(43), - SSHFP(44), - IPSECKEY(45), - RRSIG(46), - NSEC(47), - DNSKEY(48), - DHCID(49), - NSEC3(50), - NSEC3PARAM(51), - HIP(55), - NINFO(56), - RKEY(57), - TALINK(58), - SPF(99), - UINFO(100), - UID(101), - GID(102), - TKEY(249), - TSIG(250), - IXFR(251), - AXFR(252), - MAILB(253), - MAILA(254), - ANY(255), - TA(32768), - DLV(32769); - - /** - * The value of this DNS record type. - */ - private final int value; - - /** - * Internal lookup table to map values to types. - */ - private final static HashMap<Integer, TYPE> INVERSE_LUT = - new HashMap<Integer, TYPE>(); - - /** - * Initialize the reverse lookup table. - */ - static { - for(TYPE t: TYPE.values()) { - INVERSE_LUT.put(t.getValue(), t); - } - } - - /** - * Create a new record type. - * @param value The binary value of this type. - */ - private TYPE(int value) { - this.value = value; - } - - /** - * Retrieve the binary value of this type. - * @return The binary value. - */ - public int getValue() { - return value; - } - - /** - * Retrieve the symbolic type of the binary value. - * @param value The binary type value. - * @return The symbolic tpye. - */ - public static TYPE getType(int value) { - return INVERSE_LUT.get(value); - } - }; - - /** - * The symbolic class of a DNS record (usually IN for Internet). - */ - public static enum CLASS { - IN(1), - CH(3), - HS(4), - NONE(254), - ANY(255); - - /** - * Internal reverse lookup table to map binary class values to symbolic - * names. - */ - private final static HashMap<Integer, CLASS> INVERSE_LUT = - new HashMap<Integer, CLASS>(); - - /** - * Initialize the interal reverse lookup table. - */ - static { - for(CLASS c: CLASS.values()) { - INVERSE_LUT.put(c.getValue(), c); - } - } - - /** - * The binary value of this dns class. - */ - private final int value; - - /** - * Create a new DNS class based on a binary value. - * @param value The binary value of this DNS class. - */ - private CLASS(int value) { - this.value = value; - } - - /** - * Retrieve the binary value of this DNS class. - * @return The binary value of this DNS class. - */ - public int getValue() { - return value; - } - - /** - * Retrieve the symbolic DNS class for a binary class value. - * @param value The binary DNS class value. - * @return The symbolic class instance. - */ - public static CLASS getClass(int value) { - return INVERSE_LUT.get(value); - } - - } - - /** - * The generic name of this record. - */ - protected String name; - - /** - * The type (and payload type) of this record. - */ - protected TYPE type; - - /** - * The record class (usually CLASS.IN). - */ - protected CLASS clazz; - - /** - * The ttl of this record. - */ - protected long ttl; - - /** - * The payload object of this record. - */ - protected Data payloadData; - - /** - * MDNS defines the highest bit of the class as the unicast query bit. - */ - protected boolean unicastQuery; - - /** - * Parse a given record based on the full message data and the current - * stream position. - * @param dis The DataInputStream positioned at the first record byte. - * @param data The full message data. - * @throws IOException In case of malformed replies. - */ - public void parse(DataInputStream dis, byte[] data) throws IOException { - this.name = NameUtil.parse(dis, data); - this.type = TYPE.getType(dis.readUnsignedShort()); - int clazzValue = dis.readUnsignedShort(); - this.clazz = CLASS.getClass(clazzValue & 0x7fff); - this.unicastQuery = (clazzValue & 0x8000) > 0; - if (this.clazz == null) { - LOGGER.log(Level.FINE, "Unknown class " + clazzValue); - } - this.ttl = (((long)dis.readUnsignedShort()) << 32) + - dis.readUnsignedShort(); - int payloadLength = dis.readUnsignedShort(); - switch (this.type) { - case SRV: - this.payloadData = new SRV(); - break; - case AAAA: - this.payloadData = new AAAA(); - break; - case A: - this.payloadData = new A(); - break; - case NS: - this.payloadData = new NS(); - break; - case CNAME: - this.payloadData = new CNAME(); - break; - case PTR: - this.payloadData = new PTR(); - break; - case TXT: - this.payloadData = new TXT(); - break; - default: - LOGGER.log(Level.FINE, "Unparsed type " + type); - this.payloadData = null; - for (int i = 0; i < payloadLength; i++) { - dis.readByte(); - } - break; - } - if (this.payloadData != null) { - this.payloadData.parse(dis, data, payloadLength); - } - } - - /** - * Retrieve a textual representation of this resource record. - * @return String - */ - @Override - public String toString() { - if (payloadData == null) { - return "RR " + type + "/" + clazz; - } - return "RR " + type + "/" + clazz + ": " + payloadData.toString(); - }; - - /** - * Check if this record answers a given query. - * @param q The query. - * @return True if this record is a valid answer. - */ - public boolean isAnswer(Question q) { - return ((q.getType() == type) || (q.getType() == TYPE.ANY)) && - ((q.getClazz() == clazz) || (q.getClazz() == CLASS.ANY)) && - (q.getName().equals(name)); - } - - /** - * See if this query/response was a unicast query (highest class bit set). - * @return True if it is a unicast query/response record. - */ - public boolean isUnicastQuery() { - return unicastQuery; - } - - /** - * 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; - } - - /** - * Retrieve the record ttl. - * @return The record ttl. - */ - public long getTtl() { - return ttl; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/A.java b/libs/minidns/src/main/java/de/measite/minidns/record/A.java deleted file mode 100644 index 4311c651..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/A.java +++ /dev/null @@ -1,43 +0,0 @@ -package de.measite.minidns.record; - -import java.io.DataInputStream; -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 - public TYPE getType() { - return TYPE.A; - } - - @Override - public byte[] toByteArray() { - return ip; - } - - @Override - public void parse(DataInputStream dis, byte[] data, int length) - throws IOException { - ip = new byte[4]; - dis.readFully(ip); - } - - @Override - public String toString() { - return Integer.toString(ip[0] & 0xff) + "." + - Integer.toString(ip[1] & 0xff) + "." + - Integer.toString(ip[2] & 0xff) + "." + - Integer.toString(ip[3] & 0xff); - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/AAAA.java b/libs/minidns/src/main/java/de/measite/minidns/record/AAAA.java deleted file mode 100644 index e4fd5ecf..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/AAAA.java +++ /dev/null @@ -1,49 +0,0 @@ -package de.measite.minidns.record; - -import java.io.DataInputStream; -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 - public TYPE getType() { - return TYPE.AAAA; - } - - @Override - public byte[] toByteArray() { - return ip; - } - - @Override - public void parse(DataInputStream dis, byte[] data, int length) - throws IOException { - ip = new byte[16]; - dis.readFully(ip); - } - - @Override - public String toString() { - StringBuilder sb = new StringBuilder(); - for (int i = 0; i < ip.length; i += 2) { - if (i != 0) { - sb.append(':'); - } - sb.append(Integer.toHexString( - ((ip[i] & 0xff) << 8) + (ip[i + 1] & 0xff) - )); - } - return sb.toString(); - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/CNAME.java b/libs/minidns/src/main/java/de/measite/minidns/record/CNAME.java deleted file mode 100644 index 1ac27814..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/CNAME.java +++ /dev/null @@ -1,46 +0,0 @@ -package de.measite.minidns.record; - -import java.io.DataInputStream; -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; - - public String getName() { - return name; - } - - public void setName(String name) { - this.name = name; - } - - @Override - public byte[] toByteArray() { - throw new UnsupportedOperationException("Not implemented yet"); - } - - @Override - public void parse(DataInputStream dis, byte[] data, int length) - throws IOException - { - this.name = NameUtil.parse(dis, data); - } - - @Override - public TYPE getType() { - return TYPE.CNAME; - } - - @Override - public String toString() { - return "to \"" + name + "\""; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/Data.java b/libs/minidns/src/main/java/de/measite/minidns/record/Data.java deleted file mode 100644 index 7f2db03a..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/Data.java +++ /dev/null @@ -1,34 +0,0 @@ -package de.measite.minidns.record; - -import java.io.DataInputStream; -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/libs/minidns/src/main/java/de/measite/minidns/record/NS.java b/libs/minidns/src/main/java/de/measite/minidns/record/NS.java deleted file mode 100644 index 8ac2d4c3..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/NS.java +++ /dev/null @@ -1,15 +0,0 @@ -package de.measite.minidns.record; - -import de.measite.minidns.Record.TYPE; - -/** - * Nameserver record. - */ -public class NS extends CNAME { - - @Override - public TYPE getType() { - return TYPE.NS; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/PTR.java b/libs/minidns/src/main/java/de/measite/minidns/record/PTR.java deleted file mode 100644 index 6e200655..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/PTR.java +++ /dev/null @@ -1,19 +0,0 @@ -package de.measite.minidns.record; - -import java.io.DataInputStream; -import java.io.IOException; - -import de.measite.minidns.Record.TYPE; -import de.measite.minidns.util.NameUtil; - -/** - * A PTR record is handled like a CNAME - */ -public class PTR extends CNAME { - - @Override - public TYPE getType() { - return TYPE.PTR; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/SRV.java b/libs/minidns/src/main/java/de/measite/minidns/record/SRV.java deleted file mode 100644 index 707bf3f5..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/SRV.java +++ /dev/null @@ -1,124 +0,0 @@ -package de.measite.minidns.record; - -import java.io.DataInputStream; -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() { - throw new UnsupportedOperationException("Not implemented yet"); - } - - @Override - public void parse(DataInputStream dis, byte[] data, int length) - throws IOException - { - this.priority = dis.readUnsignedShort(); - this.weight = dis.readUnsignedShort(); - this.port = dis.readUnsignedShort(); - this.name = NameUtil.parse(dis, data); - } - - @Override - public String toString() { - return "SRV " + name + ":" + port + " p:" + priority + " w:" + weight; - } - - @Override - public TYPE getType() { - return TYPE.SRV; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/record/TXT.java b/libs/minidns/src/main/java/de/measite/minidns/record/TXT.java deleted file mode 100644 index 03e73040..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/record/TXT.java +++ /dev/null @@ -1,65 +0,0 @@ -package de.measite.minidns.record; - -import java.io.DataInputStream; -import java.io.IOException; - -import de.measite.minidns.Record.TYPE; -import de.measite.minidns.util.NameUtil; - -/** - * TXT record (actually a binary blob with wrappers for text content). - */ -public class TXT implements Data { - - protected byte[] blob; - - public byte[] getBlob() { - return blob; - } - - public void setBlob(byte[] blob) { - this.blob = blob; - } - - public String getText() { - try { - return (new String(blob, "UTF-8")).intern(); - } catch (Exception e) { - /* Can't happen for UTF-8 unless it's really a blob */ - return null; - } - } - - public void setText(String text) { - try { - this.blob = text.getBytes("UTF-8"); - } catch (Exception e) { - /* Can't happen, UTF-8 IS supported */ - throw new RuntimeException("UTF-8 not supported", e); - } - } - - @Override - public byte[] toByteArray() { - throw new UnsupportedOperationException("Not implemented yet"); - } - - @Override - public void parse(DataInputStream dis, byte[] data, int length) - throws IOException - { - blob = new byte[length]; - dis.readFully(blob); - } - - @Override - public TYPE getType() { - return TYPE.TXT; - } - - @Override - public String toString() { - return "\"" + getText() + "\""; - } - -} diff --git a/libs/minidns/src/main/java/de/measite/minidns/util/NameUtil.java b/libs/minidns/src/main/java/de/measite/minidns/util/NameUtil.java deleted file mode 100644 index 7ae373bc..00000000 --- a/libs/minidns/src/main/java/de/measite/minidns/util/NameUtil.java +++ /dev/null @@ -1,129 +0,0 @@ -package de.measite.minidns.util; - -import java.io.ByteArrayOutputStream; -import java.io.DataInputStream; -import java.io.DataOutputStream; -import java.io.IOException; -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; - if (name2 == null) return false; - if (name1.equals(name2)) return true; - - try { - return Arrays.equals(toByteArray(name1),toByteArray(name2)); - } catch (IOException e) { - return false; // impossible - } - } - - /** - * 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); - for (String s: name.split("[.\u3002\uFF0E\uFF61]")) { - byte[] buffer = IDN.toASCII(s).getBytes(); - dos.writeByte(buffer.length); - dos.write(buffer); - } - 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 - { - int c = dis.readUnsignedByte(); - if ((c & 0xc0) == 0xc0) { - c = ((c & 0x3f) << 8) + dis.readUnsignedByte(); - HashSet<Integer> jumps = new HashSet<Integer>(); - jumps.add(c); - return parse(data, c, jumps); - } - if (c == 0) { - return ""; - } - byte b[] = new byte[c]; - dis.readFully(b); - String s = IDN.toUnicode(new String(b)); - String t = parse(dis, data); - if (t.length() > 0) { - s = s + "." + t; - } - 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, - HashSet<Integer> jumps - ) { - int c = data[offset] & 0xff; - if ((c & 0xc0) == 0xc0) { - c = ((c & 0x3f) << 8) + (data[offset + 1] & 0xff); - if (jumps.contains(c)) { - throw new IllegalStateException("Cyclic offsets detected."); - } - jumps.add(c); - return parse(data, c, jumps); - } - if (c == 0) { - return ""; - } - String s = new String(data,offset + 1, c); - String t = parse(data, offset + 1 + c, jumps); - if (t.length() > 0) { - s = s + "." + t; - } - return s; - } - -} |