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annotate src/ch/ethz/ssh2/channel/Channel.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
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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Carl Byington <carl@five-ten-sg.com>
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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 package ch.ethz.ssh2.channel;
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6
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7 import java.io.IOException;
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8
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9 import ch.ethz.ssh2.transport.TransportManager;
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10
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11 /**
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12 * Channel.
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13 *
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14 * @author Christian Plattner
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15 * @version $Id: Channel.java 123 2014-04-12 21:11:47Z dkocher@sudo.ch $
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16 */
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17 public class Channel
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18 {
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19 /*
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20 * OK. Here is an important part of the JVM Specification:
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21 * (http://java.sun.com/docs/books/vmspec/2nd-edition/html/Threads.doc.html#22214)
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22 *
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23 * Any association between locks and variables is purely conventional.
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24 * Locking any lock conceptually flushes all variables from a thread's
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25 * working memory, and unlocking any lock forces the writing out to main
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26 * memory of all variables that the thread has assigned. That a lock may be
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27 * associated with a particular object or a class is purely a convention.
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28 * (...)
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29 *
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30 * If a thread uses a particular shared variable only after locking a
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31 * particular lock and before the corresponding unlocking of that same lock,
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32 * then the thread will read the shared value of that variable from main
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33 * memory after the lock operation, if necessary, and will copy back to main
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34 * memory the value most recently assigned to that variable before the
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35 * unlock operation.
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36 *
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37 * This, in conjunction with the mutual exclusion rules for locks, suffices
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38 * to guarantee that values are correctly transmitted from one thread to
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39 * another through shared variables.
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40 *
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41 * ====> Always keep that in mind when modifying the Channel/ChannelManger
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42 * code.
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43 *
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44 */
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45
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46 public static final int STATE_OPENING = 1;
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47 public static final int STATE_OPEN = 2;
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48 public static final int STATE_CLOSED = 4;
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49
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50 static final int CHANNEL_BUFFER_SIZE = 32 * 1024 * 3 * 2;
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51
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52 /*
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53 * To achieve correctness, the following rules have to be respected when
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54 * accessing this object:
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55 */
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56
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57 // These fields can always be read
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58 final ChannelManager cm;
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59 final ChannelOutputStream stdinStream;
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60 final ChannelInputStream stdoutStream;
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61 final ChannelInputStream stderrStream;
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62
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63 // In case this channel belongs to a server-side session.
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64 ServerSessionImpl ss;
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65
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66 // These two fields will only be written while the Channel is in state
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67 // STATE_OPENING.
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68 // The code makes sure that the two fields are written out when the state is
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69 // changing to STATE_OPEN.
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70 // Therefore, if you know that the Channel is in state STATE_OPEN, then you
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71 // can read these two fields without synchronizing on the Channel. However, make
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72 // sure that you get the latest values (e.g., flush caches by synchronizing on any
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73 // object). However, to be on the safe side, you can lock the channel.
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74
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75 int localID = -1;
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76 int remoteID = -1;
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77
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78 /*
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79 * Make sure that we never send a data/EOF/WindowChange msg after a CLOSE
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80 * msg.
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81 *
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82 * This is a little bit complicated, but we have to do it in that way, since
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83 * we cannot keep a lock on the Channel during the send operation (this
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84 * would block sometimes the receiver thread, and, in extreme cases, can
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85 * lead to a deadlock on both sides of the connection (senders are blocked
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86 * since the receive buffers on the other side are full, and receiver
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87 * threads wait for the senders to finish). It all depends on the
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88 * implementation on the other side. But we cannot make any assumptions, we
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89 * have to assume the worst case. Confused? Just believe me.
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90 */
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91
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92 /*
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93 * If you send a message on a channel, then you have to aquire the
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94 * "channelSendLock" and check the "closeMessageSent" flag (this variable
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95 * may only be accessed while holding the "channelSendLock" !!!
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96 *
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97 * BTW: NEVER EVER SEND MESSAGES FROM THE RECEIVE THREAD - see explanation
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98 * above.
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99 */
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100
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101 final Object channelSendLock = new Object();
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102 boolean closeMessageSent = false;
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103
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104 /*
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105 * Stop memory fragmentation by allocating this often used buffer.
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106 * May only be used while holding the channelSendLock
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107 */
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108
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109 final byte[] msgWindowAdjust = new byte[9];
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110
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111 // If you access (read or write) any of the following fields, then you have
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112 // to synchronize on the channel.
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113
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114 int state = STATE_OPENING;
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115
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116 boolean closeMessageRecv = false;
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117
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118 /* This is a stupid implementation. At the moment we can only wait
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119 * for one pending request per channel.
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120 */
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121 int successCounter = 0;
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122 int failedCounter = 0;
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123
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124 int localWindow = 0; /* locally, we use a small window, < 2^31 */
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125 long remoteWindow = 0; /* long for readable 2^32 - 1 window support */
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126
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127 int localMaxPacketSize = -1;
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128 int remoteMaxPacketSize = -1;
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129
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130 final byte[] stdoutBuffer = new byte[CHANNEL_BUFFER_SIZE];
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131 final byte[] stderrBuffer = new byte[CHANNEL_BUFFER_SIZE];
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132
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133 int stdoutReadpos = 0;
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134 int stdoutWritepos = 0;
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135 int stderrReadpos = 0;
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136 int stderrWritepos = 0;
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137
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138 boolean EOF = false;
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139
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140 Integer exit_status;
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141
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142 String exit_signal;
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143
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144 // we keep the x11 cookie so that this channel can be closed when this
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145 // specific x11 forwarding gets stopped
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146
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147 String hexX11FakeCookie;
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148
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149 // reasonClosed is special, since we sometimes need to access it
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150 // while holding the channelSendLock.
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151 // We protect it with a private short term lock.
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152
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153 private final Object reasonClosedLock = new Object();
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154 private IOException reasonClosed = null;
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155
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156 public Channel(ChannelManager cm)
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157 {
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158 this.cm = cm;
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159
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160 this.localWindow = CHANNEL_BUFFER_SIZE;
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161 this.localMaxPacketSize = TransportManager.MAX_PACKET_SIZE;
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162
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163 this.stdinStream = new ChannelOutputStream(this);
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164 this.stdoutStream = new ChannelInputStream(this, false);
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165 this.stderrStream = new ChannelInputStream(this, true);
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166 }
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167
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168 /* Methods to allow access from classes outside of this package */
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169
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170 public ChannelInputStream getStderrStream()
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171 {
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172 return stderrStream;
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173 }
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174
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175 public ChannelOutputStream getStdinStream()
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176 {
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177 return stdinStream;
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178 }
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179
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180 public ChannelInputStream getStdoutStream()
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181 {
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182 return stdoutStream;
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183 }
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184
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185 public String getExitSignal()
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186 {
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187 synchronized (this)
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188 {
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189 return exit_signal;
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190 }
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191 }
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192
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193 public Integer getExitStatus()
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194 {
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195 synchronized (this)
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196 {
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197 return exit_status;
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198 }
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199 }
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200
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201 public IOException getReasonClosed()
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202 {
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203 synchronized (reasonClosedLock)
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204 {
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205 return reasonClosed;
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206 }
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207 }
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208
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209 public void setReasonClosed(IOException e)
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210 {
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211 synchronized (reasonClosedLock)
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212 {
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213 this.reasonClosed = e;
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214 }
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215 }
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216
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217 public int getState()
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218 {
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219 return this.state;
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220 }
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221 }