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annotate src/ch/ethz/ssh2/transport/ClientServerHello.java @ 273:91a31873c42a ganymed

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author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5
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6 package ch.ethz.ssh2.transport;
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7
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8 import java.io.IOException;
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9 import java.io.InputStream;
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10 import java.io.InputStreamReader;
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11 import java.io.LineNumberReader;
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12 import java.io.OutputStream;
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13
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14 import ch.ethz.ssh2.util.StringEncoder;
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15
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16 /**
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17 * @author Christian Plattner
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18 * @version $Id: ClientServerHello.java 155 2014-04-28 12:01:19Z dkocher@sudo.ch $
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19 */
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20 public class ClientServerHello {
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21 private final String client_line;
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22 private final String server_line;
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23
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24 private ClientServerHello(String client_line, String server_line) {
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25 this.client_line = client_line;
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26 this.server_line = server_line;
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27 }
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28
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29 public static ClientServerHello clientHello(String softwareversion, InputStream bi, OutputStream bo)
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30 throws IOException {
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31 return exchange(softwareversion, bi, bo, true);
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32 }
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33
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34 public static ClientServerHello serverHello(String softwareversion, InputStream bi, OutputStream bo)
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35 throws IOException {
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36 return exchange(softwareversion, bi, bo, false);
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37 }
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38
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39 private static ClientServerHello exchange(String softwareversion, InputStream bi, OutputStream bo, boolean clientMode)
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40 throws IOException {
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41 String localIdentifier = String.format("SSH-2.0-%s", softwareversion);
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42
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43 bo.write(StringEncoder.GetBytes(String.format("%s\r\n", localIdentifier)));
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44 bo.flush();
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45
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46 // Expect SSH-protoversion-softwareversion SP comments CR LF
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47 String remoteIdentifier = new LineNumberReader(new InputStreamReader(bi)).readLine();
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48 if(null == remoteIdentifier) {
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49 throw new IOException("Premature connection close");
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50 }
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51 if(!remoteIdentifier.startsWith("SSH-")) {
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52 throw new IOException(String.format("Malformed SSH identification %s", remoteIdentifier));
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53 }
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54 if(!remoteIdentifier.startsWith("SSH-1.99-")
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55 && !remoteIdentifier.startsWith("SSH-2.0-")) {
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56 throw new IOException(String.format("Incompatible remote protocol version %s", remoteIdentifier));
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57 }
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58 if(clientMode) {
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59 return new ClientServerHello(localIdentifier, remoteIdentifier);
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60 }
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61 else {
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62 return new ClientServerHello(remoteIdentifier, localIdentifier);
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63 }
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64 }
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65
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66 /**
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67 * @return Returns the client_versioncomment.
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68 */
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69 public byte[] getClientString() {
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70 return StringEncoder.GetBytes(client_line);
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71 }
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72
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73 /**
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74 * @return Returns the server_versioncomment.
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75 */
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76 public byte[] getServerString() {
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77 return StringEncoder.GetBytes(server_line);
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78 }
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79 }