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annotate src/ch/ethz/ssh2/transport/ClientServerHello.java @ 357:46c2115ae1c8

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update jzlib to a21be20213d66eff15904d925e9b721956a01ef7
author Carl Byington <carl@five-ten-sg.com>
date Fri, 01 Aug 2014 13:34:58 -0700
parents 126af684034e
children
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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 public final static int readLineRN(InputStream is, byte[] buffer) throws IOException {
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25 int pos = 0;
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26 boolean need10 = false;
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27 int len = 0;
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28
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29 while (true) {
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30 int c = is.read();
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31
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32 if (c == -1)
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33 throw new IOException("Premature connection close");
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34
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35 buffer[pos++] = (byte) c;
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36
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37 if (c == 13) {
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38 need10 = true;
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39 continue;
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40 }
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41
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42 if (c == 10)
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43 break;
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44
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45 if (need10 == true)
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46 throw new IOException("Malformed line sent by the server, the line does not end correctly.");
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47
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48 len++;
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49
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50 if (pos >= buffer.length)
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51 throw new IOException("The server sent a too long line.");
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52 }
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53
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54 return len;
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55 }
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56
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57 private ClientServerHello(String client_line, String server_line) {
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58 this.client_line = client_line;
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59 this.server_line = server_line;
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60 }
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61
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62 public static ClientServerHello clientHello(String softwareversion, InputStream bi, OutputStream bo)
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63 throws IOException {
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64 return exchange(softwareversion, bi, bo, true);
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65 }
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66
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67 public static ClientServerHello serverHello(String softwareversion, InputStream bi, OutputStream bo)
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68 throws IOException {
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69 return exchange(softwareversion, bi, bo, false);
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70 }
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71
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72 private static ClientServerHello exchange(String softwareversion, InputStream bi, OutputStream bo, boolean clientMode)
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73 throws IOException {
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74 String localIdentifier = String.format("SSH-2.0-%s", softwareversion);
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75 bo.write(StringEncoder.GetBytes(String.format("%s\r\n", localIdentifier)));
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76 bo.flush();
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77 // Expect SSH-protoversion-softwareversion SP comments CR LF
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78 byte[] serverVersion = new byte[512];
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79 String remoteIdentifier = null;
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80 for (int i = 0; i < 50; i++) {
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81 int len = readLineRN(bi, serverVersion);
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82 remoteIdentifier = new String(serverVersion, 0, len, "ISO-8859-1");
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83 if (remoteIdentifier.startsWith("SSH-")) break;
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84 }
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85
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86 if (remoteIdentifier.equals("")) {
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87 throw new IOException("Premature connection close");
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88 }
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89
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90 if (!remoteIdentifier.startsWith("SSH-")) {
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91 throw new IOException(String.format("Malformed SSH identification %s", remoteIdentifier));
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92 }
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93
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94 if (!remoteIdentifier.startsWith("SSH-1.99-")
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95 && !remoteIdentifier.startsWith("SSH-2.0-")) {
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96 throw new IOException(String.format("Incompatible remote protocol version %s", remoteIdentifier));
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97 }
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98
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99 if (clientMode) {
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100 return new ClientServerHello(localIdentifier, remoteIdentifier);
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101 }
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102 else {
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103 return new ClientServerHello(remoteIdentifier, localIdentifier);
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104 }
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105 }
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106
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107 /**
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108 * @return Returns the client_versioncomment.
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109 */
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110 public byte[] getClientString() {
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111 return StringEncoder.GetBytes(client_line);
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112 }
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113
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114 /**
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115 * @return Returns the server_versioncomment.
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116 */
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117 public byte[] getServerString() {
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118 return StringEncoder.GetBytes(server_line);
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119 }
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120 }