org.jivesoftware.smackx.bytestreams.socks5.Socks5Utils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of smack Show documentation

Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.

The newest version!

/**
 * 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 XEP-0065.
     * 
     * @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.
     * 
     * (see RFC1928)
     * 
     * @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;
    }

}