1 /** 2 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); 3 * you may not use this file except in compliance with the License. 4 * You may obtain a copy of the License at 5 * 6 * http://www.apache.org/licenses/LICENSE-2.0 7 * 8 * Unless required by applicable law or agreed to in writing, software 9 * distributed under the License is distributed on an "AS IS" BASIS, 10 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 * See the License for the specific language governing permissions and 12 * limitations under the License. 13 */ 14 package org.jivesoftware.smackx.bytestreams.socks5; 15 16 import java.io.DataInputStream; 17 import java.io.IOException; 18 19 import org.jivesoftware.smack.XMPPException; 20 import org.jivesoftware.smack.util.StringUtils; 21 22 /** 23 * A collection of utility methods for SOcKS5 messages. 24 * 25 * @author Henning Staib 26 */ 27 class Socks5Utils { 28 29 /** 30 * Returns a SHA-1 digest of the given parameters as specified in <a 31 * href="http://xmpp.org/extensions/xep-0065.html#impl-socks5">XEP-0065</a>. 32 * 33 * @param sessionID for the SOCKS5 Bytestream 34 * @param initiatorJID JID of the initiator of a SOCKS5 Bytestream 35 * @param targetJID JID of the target of a SOCKS5 Bytestream 36 * @return SHA-1 digest of the given parameters 37 */ 38 public static String createDigest(String sessionID, String initiatorJID, String targetJID) { 39 StringBuilder b = new StringBuilder(); 40 b.append(sessionID).append(initiatorJID).append(targetJID); 41 return StringUtils.hash(b.toString()); 42 } 43 44 /** 45 * Reads a SOCKS5 message from the given InputStream. The message can either be a SOCKS5 request 46 * message or a SOCKS5 response message. 47 * <p> 48 * (see <a href="http://tools.ietf.org/html/rfc1928">RFC1928</a>) 49 * 50 * @param in the DataInputStream to read the message from 51 * @return the SOCKS5 message 52 * @throws IOException if a network error occurred 53 * @throws XMPPException if the SOCKS5 message contains an unsupported address type 54 */ 55 public static byte[] receiveSocks5Message(DataInputStream in) throws IOException, XMPPException { 56 byte[] header = new byte[5]; 57 in.readFully(header, 0, 5); 58 59 if (header[3] != (byte) 0x03) { 60 throw new XMPPException("Unsupported SOCKS5 address type"); 61 } 62 63 int addressLength = header[4]; 64 65 byte[] response = new byte[7 + addressLength]; 66 System.arraycopy(header, 0, response, 0, header.length); 67 68 in.readFully(response, header.length, addressLength + 2); 69 70 return response; 71 } 72 73 } 74
