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/**
* 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.smackx.bytestreams.socks5;
import java.io.DataInputStream;
import java.io.IOException;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.util.StringUtils;
/**
* A collection of utility methods for SOcKS5 messages.
*
* @author Henning Staib
*/
class Socks5Utils {
/**
* Returns a SHA-1 digest of the given parameters as specified in <a
* href="http://xmpp.org/extensions/xep-0065.html#impl-socks5">XEP-0065</a>.
*
* @param sessionID for the SOCKS5 Bytestream
* @param initiatorJID JID of the initiator of a SOCKS5 Bytestream
* @param targetJID JID of the target of a SOCKS5 Bytestream
* @return SHA-1 digest of the given parameters
*/
public static String createDigest(String sessionID, String initiatorJID, String targetJID) {
StringBuilder b = new StringBuilder();
b.append(sessionID).append(initiatorJID).append(targetJID);
return StringUtils.hash(b.toString());
}
/**
* Reads a SOCKS5 message from the given InputStream. The message can either be a SOCKS5 request
* message or a SOCKS5 response message.
* <p>
* (see <a href="http://tools.ietf.org/html/rfc1928">RFC1928</a>)
*
* @param in the DataInputStream to read the message from
* @return the SOCKS5 message
* @throws IOException if a network error occurred
* @throws XMPPException if the SOCKS5 message contains an unsupported address type
*/
public static byte[] receiveSocks5Message(DataInputStream in) throws IOException, XMPPException {
byte[] header = new byte[5];
in.readFully(header, 0, 5);
if (header[3] != (byte) 0x03) {
throw new XMPPException("Unsupported SOCKS5 address type");
}
int addressLength = header[4];
byte[] response = new byte[7 + addressLength];
System.arraycopy(header, 0, response, 0, header.length);
in.readFully(response, header.length, addressLength + 2);
return response;
}
}
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