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annotate src/ch/ethz/ssh2/transport/ClientServerHello.java @ 336:63b23b7c840d ganymed

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still hangs during connection
author Carl Byington <carl@five-ten-sg.com>
date Thu, 31 Jul 2014 14:58:57 -0700
parents e25e377d29d3
children 0d0d2fc9918c
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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.OutputStream;
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11
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12 import ch.ethz.ssh2.util.StringEncoder;
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13
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14 /**
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15 * @author Christian Plattner
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16 * @version $Id: ClientServerHello.java 155 2014-04-28 12:01:19Z dkocher@sudo.ch $
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17 */
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18 public class ClientServerHello {
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19 private final String client_line;
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20 private final String server_line;
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21
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22 public final static int readLineRN(InputStream is, byte[] buffer) throws IOException {
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23 int pos = 0;
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24 boolean need10 = false;
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25 int len = 0;
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26
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27 while (true) {
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28 int c = is.read();
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29
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30 if (c == -1)
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31 throw new IOException("Premature connection close");
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32
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33 buffer[pos++] = (byte) c;
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34
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35 if (c == 13) {
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36 need10 = true;
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37 continue;
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38 }
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39
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40 if (c == 10)
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41 break;
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42
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43 if (need10 == true)
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44 throw new IOException("Malformed line sent by the server, the line does not end correctly.");
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45
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46 len++;
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47
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48 if (pos >= buffer.length)
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49 throw new IOException("The server sent a too long line.");
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50 }
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51
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52 return len;
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53 }
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54
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55 private ClientServerHello(String client_line, String server_line) {
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56 this.client_line = client_line;
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57 this.server_line = server_line;
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58 }
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59
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60 public static ClientServerHello clientHello(String softwareversion, InputStream bi, OutputStream bo)
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61 throws IOException {
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62 return exchange(softwareversion, bi, bo, true);
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63 }
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64
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65 public static ClientServerHello serverHello(String softwareversion, InputStream bi, OutputStream bo)
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66 throws IOException {
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67 return exchange(softwareversion, bi, bo, false);
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68 }
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69
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70 private static ClientServerHello exchange(String softwareversion, InputStream bi, OutputStream bo, boolean clientMode)
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71 throws IOException {
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72 String localIdentifier = String.format("SSH-2.0-%s", softwareversion);
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73 bo.write(StringEncoder.GetBytes(String.format("%s\r\n", localIdentifier)));
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74 bo.flush();
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75 // Expect SSH-protoversion-softwareversion SP comments CR LF
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76 byte[] serverVersion = new byte[512];
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77 String remoteIdentifier;
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78 for (int i = 0; i < 50; i++) {
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79 int len = readLineRN(bi, serverVersion);
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80 remoteIdentifier = new String(serverVersion, 0, len, "ISO-8859-1");
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81 if (remoteIdentifier.startsWith("SSH-")) break;
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82 }
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83
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84 if (remoteIdentifier.equals("")) {
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85 throw new IOException("Premature connection close");
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86 }
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87
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88 if (!remoteIdentifier.startsWith("SSH-")) {
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89 throw new IOException(String.format("Malformed SSH identification %s", remoteIdentifier));
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90 }
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91
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92 if (!remoteIdentifier.startsWith("SSH-1.99-")
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93 && !remoteIdentifier.startsWith("SSH-2.0-")) {
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94 throw new IOException(String.format("Incompatible remote protocol version %s", remoteIdentifier));
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95 }
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96
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97 if (clientMode) {
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98 return new ClientServerHello(localIdentifier, remoteIdentifier);
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99 }
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100 else {
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101 return new ClientServerHello(remoteIdentifier, localIdentifier);
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102 }
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103 }
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104
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105 /**
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106 * @return Returns the client_versioncomment.
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107 */
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108 public byte[] getClientString() {
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109 return StringEncoder.GetBytes(client_line);
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110 }
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111
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112 /**
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113 * @return Returns the server_versioncomment.
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114 */
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115 public byte[] getServerString() {
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116 return StringEncoder.GetBytes(server_line);
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117 }
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118 }