Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /**
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| 2 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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| 3 | * you may not use this file except in compliance with the License.
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| 4 | * You may obtain a copy of the License at
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| 5 | *
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| 6 | * http://www.apache.org/licenses/LICENSE-2.0
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| 7 | *
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| 8 | * Unless required by applicable law or agreed to in writing, software
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| 9 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 10 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 11 | * See the License for the specific language governing permissions and
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| 12 | * limitations under the License.
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| 13 | */
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| 14 | package org.jivesoftware.smackx.bytestreams.socks5;
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| 15 |
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| 16 | import java.io.DataInputStream;
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| 17 | import java.io.IOException;
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| 18 |
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| 19 | import org.jivesoftware.smack.XMPPException;
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| 20 | import org.jivesoftware.smack.util.StringUtils;
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| 21 |
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| 22 | /**
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| 23 | * A collection of utility methods for SOcKS5 messages.
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| 24 | *
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| 25 | * @author Henning Staib
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| 26 | */
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| 27 | class Socks5Utils {
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| 28 |
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| 29 | /**
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| 30 | * Returns a SHA-1 digest of the given parameters as specified in <a
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| 31 | * href="http://xmpp.org/extensions/xep-0065.html#impl-socks5">XEP-0065</a>.
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| 32 | *
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| 33 | * @param sessionID for the SOCKS5 Bytestream
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| 34 | * @param initiatorJID JID of the initiator of a SOCKS5 Bytestream
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| 35 | * @param targetJID JID of the target of a SOCKS5 Bytestream
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| 36 | * @return SHA-1 digest of the given parameters
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| 37 | */
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| 38 | public static String createDigest(String sessionID, String initiatorJID, String targetJID) {
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| 39 | StringBuilder b = new StringBuilder();
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| 40 | b.append(sessionID).append(initiatorJID).append(targetJID);
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| 41 | return StringUtils.hash(b.toString());
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| 42 | }
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| 43 |
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| 44 | /**
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| 45 | * Reads a SOCKS5 message from the given InputStream. The message can either be a SOCKS5 request
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| 46 | * message or a SOCKS5 response message.
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| 47 | * <p>
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| 48 | * (see <a href="http://tools.ietf.org/html/rfc1928">RFC1928</a>)
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| 49 | *
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| 50 | * @param in the DataInputStream to read the message from
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| 51 | * @return the SOCKS5 message
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| 52 | * @throws IOException if a network error occurred
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| 53 | * @throws XMPPException if the SOCKS5 message contains an unsupported address type
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| 54 | */
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| 55 | public static byte[] receiveSocks5Message(DataInputStream in) throws IOException, XMPPException {
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| 56 | byte[] header = new byte[5];
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| 57 | in.readFully(header, 0, 5);
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| 58 |
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| 59 | if (header[3] != (byte) 0x03) {
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| 60 | throw new XMPPException("Unsupported SOCKS5 address type");
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| 61 | }
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| 62 |
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| 63 | int addressLength = header[4];
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| 64 |
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| 65 | byte[] response = new byte[7 + addressLength];
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| 66 | System.arraycopy(header, 0, response, 0, header.length);
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| 67 |
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| 68 | in.readFully(response, header.length, addressLength + 2);
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| 69 |
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| 70 | return response;
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| 71 | }
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| 72 |
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| 73 | }
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