1 | /******************************************************************************
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2 | *
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3 | * Copyright (c) 1998,99 by Mindbright Technology AB, Stockholm, Sweden.
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4 | * www.mindbright.se, [email protected]
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | *****************************************************************************
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17 | * $Author: mats $
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18 | * $Date: 1999/07/19 17:13:50 $
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19 | * $Name: rel1-2-1 $
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20 | *****************************************************************************/
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21 | package mindbright.ssh;
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22 |
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23 | import java.io.*;
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24 | import java.math.BigInteger;
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25 |
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26 | import mindbright.security.*;
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27 | import mindbright.util.*;
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28 |
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29 | public final class SSHPduOutputStream extends SSHDataOutputStream implements SSHPdu {
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30 |
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31 | static final class PduByteArrayOutputStream extends ByteArrayOutputStream {
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32 | PduByteArrayOutputStream() {
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33 | super();
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34 | }
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35 |
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36 | PduByteArrayOutputStream(int size) {
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37 | super(size);
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38 | }
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39 |
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40 | PduByteArrayOutputStream(byte[] buf) {
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41 | this.buf = buf;
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42 | }
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43 |
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44 | public byte[] getBuf() {
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45 | return buf;
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46 | }
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47 |
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48 | public int getCount() {
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49 | return count;
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50 | }
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51 |
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52 | public void setBuf(byte[] buf) {
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53 | this.buf = buf;
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54 | }
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55 |
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56 | public void setCount(int count) {
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57 | this.count = count;
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58 | }
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59 | }
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60 |
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61 | public static final int SSH_DEFAULT_PKT_LEN = 8192;
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62 | public static int mtu = SSH_DEFAULT_PKT_LEN;
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63 |
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64 | public static synchronized void setMTU(int newMtu) {
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65 | mtu = newMtu;
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66 | }
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67 |
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68 | byte[] readFromRawData;
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69 | int readFromOff;
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70 | int readFromSize;
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71 |
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72 | public int type;
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73 | public Cipher cipher;
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74 |
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75 | SSHPduOutputStream(Cipher cipher) {
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76 | super(null);
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77 | this.cipher = cipher;
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78 | }
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79 |
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80 | SSHPduOutputStream(int type, Cipher cipher) throws IOException {
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81 | super(new PduByteArrayOutputStream(mtu));
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82 | this.type = type;
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83 | this.cipher = cipher;
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84 | if(cipher != null) {
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85 | PduByteArrayOutputStream bytes = (PduByteArrayOutputStream)out;
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86 | SecureRandom rand = SSH.secureRandom();
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87 | rand.nextPadBytes(bytes.getBuf(), 8);
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88 | bytes.setCount(8);
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89 | } else {
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90 | for(int i = 0; i < 8; i++)
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91 | write(0);
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92 | }
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93 | write(type);
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94 | }
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95 |
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96 | public SSHPdu createPdu() throws IOException {
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97 | SSHPdu pdu;
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98 | pdu = new SSHPduOutputStream(this.type, this.cipher);
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99 | return pdu;
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100 | }
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101 |
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102 | public void readFrom(InputStream in) throws IOException {
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103 | if(type != SSH.MSG_CHANNEL_DATA &&
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104 | type != SSH.CMSG_STDIN_DATA)
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105 | throw new IOException("Trying to read raw data into non-data PDU");
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106 |
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107 | PduByteArrayOutputStream bytes = (PduByteArrayOutputStream) out;
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108 |
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109 | readFromRawData = bytes.getBuf();
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110 | readFromOff = bytes.size() + 4; // Leave space for size
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111 |
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112 | readFromSize = in.read(readFromRawData, readFromOff, mtu - readFromOff);
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113 | if(readFromSize == -1)
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114 | throw new IOException("EOF");
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115 |
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116 | writeInt(readFromSize);
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117 | bytes.setCount(readFromOff + readFromSize);
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118 | }
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119 |
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120 | public void writeTo(OutputStream sshOut) throws IOException {
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121 | PduByteArrayOutputStream bytes = (PduByteArrayOutputStream) out;
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122 | byte[] padData;
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123 | int iSz;
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124 | int pad;
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125 | int crc32;
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126 | int padSz;
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127 | int off = 0;
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128 |
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129 | iSz = bytes.size();
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130 | pad = (iSz + 4) % 8;
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131 | crc32 = (int)CRC32.getValue(bytes.getBuf(), pad, iSz - pad);
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132 | padSz = iSz + 4 - pad;
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133 | writeInt(crc32);
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134 |
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135 | padData = bytes.getBuf();
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136 |
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137 | if(cipher != null) {
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138 | cipher.encrypt(padData, pad, padData, pad, padSz);
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139 | }
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140 |
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141 | int sz = padSz - (8 - pad);
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142 | sshOut.write((sz >>> 24) & 0xff);
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143 | sshOut.write((sz >>> 16) & 0xff);
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144 | sshOut.write((sz >>> 8) & 0xff);
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145 | sshOut.write((sz >>> 0) & 0xff);
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146 |
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147 | sshOut.write(padData, pad, padSz);
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148 |
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149 | sshOut.flush();
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150 | }
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151 |
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152 | public byte[] rawData() {
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153 | return readFromRawData;
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154 | }
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155 | public void rawSetData(byte[] raw) {
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156 | }
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157 | public int rawOffset() {
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158 | return readFromOff;
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159 | }
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160 | public int rawSize() {
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161 | // !!! return readFromSize;
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162 | //
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163 | byte[] bytes = readFromRawData;
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164 | int off = readFromOff - 4;
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165 | int ch1 = ((bytes[off++] + 256) & 0xff);
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166 | int ch2 = ((bytes[off++] + 256) & 0xff);
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167 | int ch3 = ((bytes[off++] + 256) & 0xff);
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168 | int ch4 = ((bytes[off] + 256) & 0xff);
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169 | return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
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170 | }
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171 | public void rawAdjustSize(int size) {
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172 | PduByteArrayOutputStream bytes = (PduByteArrayOutputStream) out;
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173 | bytes.setCount(size);
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174 | }
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175 |
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176 | }
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177 |
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