diff options
Diffstat (limited to 'src/org/jivesoftware/smack/util/dns')
4 files changed, 294 insertions, 0 deletions
diff --git a/src/org/jivesoftware/smack/util/dns/DNSJavaResolver.java b/src/org/jivesoftware/smack/util/dns/DNSJavaResolver.java new file mode 100644 index 0000000..dd93fd3 --- /dev/null +++ b/src/org/jivesoftware/smack/util/dns/DNSJavaResolver.java @@ -0,0 +1,73 @@ +/** + * Copyright 2013 Florian Schmaus + * + * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.jivesoftware.smack.util.dns; + +import java.util.ArrayList; +import java.util.List; + +import org.xbill.DNS.Lookup; +import org.xbill.DNS.Record; +import org.xbill.DNS.Type; + +/** + * This implementation uses the <a href="http://www.dnsjava.org/">dnsjava</a> implementation for resolving DNS addresses. + * + */ +public class DNSJavaResolver implements DNSResolver { + + private static DNSJavaResolver instance = new DNSJavaResolver(); + + private DNSJavaResolver() { + + } + + public static DNSResolver getInstance() { + return instance; + } + + @Override + public List<SRVRecord> lookupSRVRecords(String name) { + List<SRVRecord> res = new ArrayList<SRVRecord>(); + + try { + Lookup lookup = new Lookup(name, Type.SRV); + Record recs[] = lookup.run(); + if (recs == null) + return res; + + for (Record record : recs) { + org.xbill.DNS.SRVRecord srvRecord = (org.xbill.DNS.SRVRecord) record; + if (srvRecord != null && srvRecord.getTarget() != null) { + String host = srvRecord.getTarget().toString(); + int port = srvRecord.getPort(); + int priority = srvRecord.getPriority(); + int weight = srvRecord.getWeight(); + + SRVRecord r; + try { + r = new SRVRecord(host, port, priority, weight); + } catch (Exception e) { + continue; + } + res.add(r); + } + } + + } catch (Exception e) { + } + return res; + } +} diff --git a/src/org/jivesoftware/smack/util/dns/DNSResolver.java b/src/org/jivesoftware/smack/util/dns/DNSResolver.java new file mode 100644 index 0000000..86f037b --- /dev/null +++ b/src/org/jivesoftware/smack/util/dns/DNSResolver.java @@ -0,0 +1,33 @@ +/** + * Copyright 2013 Florian Schmaus + * + * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.jivesoftware.smack.util.dns; + +import java.util.List; + +/** + * Implementations of this interface define a class that is capable of resolving DNS addresses. + * + */ +public interface DNSResolver { + + /** + * Gets a list of service records for the specified service. + * @param name The symbolic name of the service. + * @return The list of SRV records mapped to the service name. + */ + List<SRVRecord> lookupSRVRecords(String name); + +} diff --git a/src/org/jivesoftware/smack/util/dns/HostAddress.java b/src/org/jivesoftware/smack/util/dns/HostAddress.java new file mode 100644 index 0000000..eb8b07a --- /dev/null +++ b/src/org/jivesoftware/smack/util/dns/HostAddress.java @@ -0,0 +1,109 @@ +/** + * Copyright 2013 Florian Schmaus + * + * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.jivesoftware.smack.util.dns; + +public class HostAddress { + private String fqdn; + private int port; + private Exception exception; + + /** + * Creates a new HostAddress with the given FQDN. The port will be set to the default XMPP client port: 5222 + * + * @param fqdn Fully qualified domain name. + * @throws IllegalArgumentException If the fqdn is null. + */ + public HostAddress(String fqdn) { + if (fqdn == null) + throw new IllegalArgumentException("FQDN is null"); + if (fqdn.charAt(fqdn.length() - 1) == '.') { + this.fqdn = fqdn.substring(0, fqdn.length() - 1); + } + else { + this.fqdn = fqdn; + } + // Set port to the default port for XMPP client communication + this.port = 5222; + } + + /** + * Creates a new HostAddress with the given FQDN. The port will be set to the default XMPP client port: 5222 + * + * @param fqdn Fully qualified domain name. + * @param port The port to connect on. + * @throws IllegalArgumentException If the fqdn is null or port is out of valid range (0 - 65535). + */ + public HostAddress(String fqdn, int port) { + this(fqdn); + if (port < 0 || port > 65535) + throw new IllegalArgumentException( + "DNS SRV records weight must be a 16-bit unsiged integer (i.e. between 0-65535. Port was: " + port); + + this.port = port; + } + + public String getFQDN() { + return fqdn; + } + + public int getPort() { + return port; + } + + public void setException(Exception e) { + this.exception = e; + } + + @Override + public String toString() { + return fqdn + ":" + port; + } + + @Override + public boolean equals(Object o) { + if (this == o) { + return true; + } + if (!(o instanceof HostAddress)) { + return false; + } + + final HostAddress address = (HostAddress) o; + + if (!fqdn.equals(address.fqdn)) { + return false; + } + return port == address.port; + } + + @Override + public int hashCode() { + int result = 1; + result = 37 * result + fqdn.hashCode(); + return result * 37 + port; + } + + public String getErrorMessage() { + String error; + if (exception == null) { + error = "No error logged"; + } + else { + error = exception.getMessage(); + } + return toString() + " Exception: " + error; + } +} diff --git a/src/org/jivesoftware/smack/util/dns/SRVRecord.java b/src/org/jivesoftware/smack/util/dns/SRVRecord.java new file mode 100644 index 0000000..457e40e --- /dev/null +++ b/src/org/jivesoftware/smack/util/dns/SRVRecord.java @@ -0,0 +1,79 @@ +/** + * Copyright 2013 Florian Schmaus + * + * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.jivesoftware.smack.util.dns; + +/** + * @see <a href="http://tools.ietf.org/html/rfc2782>RFC 2782: A DNS RR for specifying the location of services (DNS + * SRV)<a> + * @author Florian Schmaus + * + */ +public class SRVRecord extends HostAddress implements Comparable<SRVRecord> { + + private int weight; + private int priority; + + /** + * Create a new SRVRecord + * + * @param fqdn Fully qualified domain name + * @param port The connection port + * @param priority Priority of the target host + * @param weight Relative weight for records with same priority + * @throws IllegalArgumentException fqdn is null or any other field is not in valid range (0-65535). + */ + public SRVRecord(String fqdn, int port, int priority, int weight) { + super(fqdn, port); + if (weight < 0 || weight > 65535) + throw new IllegalArgumentException( + "DNS SRV records weight must be a 16-bit unsiged integer (i.e. between 0-65535. Weight was: " + + weight); + + if (priority < 0 || priority > 65535) + throw new IllegalArgumentException( + "DNS SRV records priority must be a 16-bit unsiged integer (i.e. between 0-65535. Priority was: " + + priority); + + this.priority = priority; + this.weight = weight; + + } + + public int getPriority() { + return priority; + } + + public int getWeight() { + return weight; + } + + @Override + public int compareTo(SRVRecord other) { + // According to RFC2782, + // "[a] client MUST attempt to contact the target host with the lowest-numbered priority it can reach". + // This means that a SRV record with a higher priority is 'less' then one with a lower. + int res = other.priority - this.priority; + if (res == 0) { + res = this.weight - other.weight; + } + return res; + } + + @Override + public String toString() { + return super.toString() + " prio:" + priority + ":w:" + weight; + } +} |