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annotate src/ch/ethz/ssh2/transport/TransportConnection.java @ 286:4656869af8fe ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 19:26:29 -0700
parents 91a31873c42a
children 071eccdff8ea
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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.transport;
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6
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7 import java.io.IOException;
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8 import java.io.InputStream;
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9 import java.io.OutputStream;
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10 import java.security.SecureRandom;
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11
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12 import ch.ethz.ssh2.PacketFormatException;
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13 import ch.ethz.ssh2.compression.Compressor;
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14 import ch.ethz.ssh2.crypto.cipher.BlockCipher;
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15 import ch.ethz.ssh2.crypto.cipher.CipherInputStream;
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16 import ch.ethz.ssh2.crypto.cipher.CipherOutputStream;
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17 import ch.ethz.ssh2.crypto.cipher.NullCipher;
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18 import ch.ethz.ssh2.crypto.digest.MAC;
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19 import ch.ethz.ssh2.log.Logger;
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20 import ch.ethz.ssh2.packets.Packets;
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21
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22 /**
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23 * TransportConnection.
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24 *
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25 * @author Christian Plattner
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26 * @version $Id: TransportConnection.java 144 2014-04-25 12:48:25Z dkocher@sudo.ch $
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27 */
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28 public class TransportConnection {
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29 private static final Logger log = Logger.getLogger(TransportConnection.class);
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30
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31 int send_seq_number = 0;
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32
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33 int recv_seq_number = 0;
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34
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35 CipherInputStream cis;
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36
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37 CipherOutputStream cos;
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38
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39 boolean useRandomPadding;
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40
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41 /* Depends on current MAC and CIPHER */
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42
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43 MAC send_mac;
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44
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45 byte[] send_mac_buffer;
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46
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47 int send_padd_blocksize = 8;
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48
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49 MAC recv_mac;
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50
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51 byte[] recv_mac_buffer;
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52
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53 byte[] recv_mac_buffer_cmp;
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54
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55 int recv_padd_blocksize = 8;
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56
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57 Compressor recv_comp;
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58
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59 Compressor send_comp;
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60
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61 boolean can_compress;
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62
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63 byte[] recv_comp_buffer;
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64
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65 byte[] send_comp_buffer;
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66
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67 /* won't change */
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68
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69 final byte[] send_padding_buffer = new byte[256];
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70
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71 final byte[] send_packet_header_buffer = new byte[5];
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72
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73 final byte[] recv_padding_buffer = new byte[256];
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74
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75 final byte[] recv_packet_header_buffer = new byte[5];
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76
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77 boolean recv_packet_header_present = false;
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78
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79 ClientServerHello csh;
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80
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81 final SecureRandom rnd;
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82
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83 public TransportConnection(InputStream is, OutputStream os, SecureRandom rnd) {
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84 this.cis = new CipherInputStream(new NullCipher(), is);
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85 this.cos = new CipherOutputStream(new NullCipher(), os);
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86 this.rnd = rnd;
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87 }
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88
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89 public void changeRecvCipher(BlockCipher bc, MAC mac) {
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90 cis.changeCipher(bc);
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91 recv_mac = mac;
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92 recv_mac_buffer = (mac != null) ? new byte[mac.size()] : null;
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93 recv_mac_buffer_cmp = (mac != null) ? new byte[mac.size()] : null;
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94 recv_padd_blocksize = bc.getBlockSize();
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95 if(recv_padd_blocksize < 8) {
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96 recv_padd_blocksize = 8;
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97 }
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98 }
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99
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100 public void changeSendCipher(BlockCipher bc, MAC mac) {
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101 if((bc instanceof NullCipher) == false) {
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102 /* Only use zero byte padding for the first few packets */
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103 useRandomPadding = true;
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104 /* Once we start encrypting, there is no way back */
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105 }
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106
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107 cos.changeCipher(bc);
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108 send_mac = mac;
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109 send_mac_buffer = (mac != null) ? new byte[mac.size()] : null;
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110 send_padd_blocksize = bc.getBlockSize();
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111 if(send_padd_blocksize < 8) {
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112 send_padd_blocksize = 8;
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113 }
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114 }
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115
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116 public void changeRecvCompression(Compressor comp) {
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117 recv_comp = comp;
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118
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119 if(comp != null) {
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120 recv_comp_buffer = new byte[comp.getBufferSize()];
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121 }
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122 }
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123
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124 public void changeSendCompression(Compressor comp) {
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125 send_comp = comp;
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126
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127 if(comp != null) {
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128 send_comp_buffer = new byte[comp.getBufferSize()];
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129 }
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130 }
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131
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132 public void sendMessage(byte[] message) throws IOException {
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133 sendMessage(message, 0, message.length, 0);
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134 }
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135
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136 public void sendMessage(byte[] message, int off, int len) throws IOException {
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137 sendMessage(message, off, len, 0);
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138 }
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139
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140 public int getPacketOverheadEstimate() {
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141 // return an estimate for the paket overhead (for send operations)
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142 return 5 + 4 + (send_padd_blocksize - 1) + send_mac_buffer.length;
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143 }
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144
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145 public void sendMessage(byte[] message, int off, int len, int padd) throws IOException {
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146 if(padd < 4) {
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147 padd = 4;
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diff changeset
148 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
149 else if(padd > 64) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
150 padd = 64;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
151 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
152
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
153 if(send_comp != null && can_compress) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154 len = send_comp.compress(message, off, len, send_comp_buffer);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
155 message = send_comp_buffer;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
157
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158 int packet_len = 5 + len + padd; /* Minimum allowed padding is 4 */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
159
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
160 int slack = packet_len % send_padd_blocksize;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
161
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
162 if(slack != 0) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
163 packet_len += (send_padd_blocksize - slack);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
164 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
165
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166 if(packet_len < 16) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167 packet_len = 16;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
170 int padd_len = packet_len - (5 + len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172 if(useRandomPadding) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
173 for(int i = 0; i < padd_len; i = i + 4) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174 /*
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175 * don't waste calls to rnd.nextInt() (by using only 8bit of the
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176 * output). just believe me: even though we may write here up to 3
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
177 * bytes which won't be used, there is no "buffer overflow" (i.e.,
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
178 * arrayindexoutofbounds). the padding buffer is big enough =) (256
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
179 * bytes, and that is bigger than any current cipher block size + 64).
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
180 */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
181
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
182 int r = rnd.nextInt();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
183 send_padding_buffer[i] = (byte) r;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
184 send_padding_buffer[i + 1] = (byte) (r >> 8);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
185 send_padding_buffer[i + 2] = (byte) (r >> 16);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
186 send_padding_buffer[i + 3] = (byte) (r >> 24);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
187 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
188 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
189 else {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
190 /* use zero padding for unencrypted traffic */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
191 for(int i = 0; i < padd_len; i++) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
192 send_padding_buffer[i] = 0;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
193 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
194 /* Actually this code is paranoid: we never filled any
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
195 * bytes into the padding buffer so far, therefore it should
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
196 * consist of zeros only.
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
197 */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
198 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
199
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
200 send_packet_header_buffer[0] = (byte) ((packet_len - 4) >> 24);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
201 send_packet_header_buffer[1] = (byte) ((packet_len - 4) >> 16);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
202 send_packet_header_buffer[2] = (byte) ((packet_len - 4) >> 8);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
203 send_packet_header_buffer[3] = (byte) ((packet_len - 4));
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
204 send_packet_header_buffer[4] = (byte) padd_len;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
206 cos.write(send_packet_header_buffer, 0, 5);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
207 cos.write(message, off, len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
208 cos.write(send_padding_buffer, 0, padd_len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
209
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
210 if(send_mac != null) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
211 send_mac.initMac(send_seq_number);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
212 send_mac.update(send_packet_header_buffer, 0, 5);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
213 send_mac.update(message, off, len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
214 send_mac.update(send_padding_buffer, 0, padd_len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
215
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216 send_mac.getMac(send_mac_buffer, 0);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
217 cos.writePlain(send_mac_buffer, 0, send_mac_buffer.length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
218 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
219
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220 cos.flush();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
221
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 if(log.isDebugEnabled()) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
223 log.debug("Sent " + Packets.getMessageName(message[off] & 0xff) + " " + len + " bytes payload");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
224 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
225
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226 send_seq_number++;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
227 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
228
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
229 public int peekNextMessageLength() throws IOException {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230 if(recv_packet_header_present == false) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
231 cis.read(recv_packet_header_buffer, 0, 5);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232 recv_packet_header_present = true;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
233 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
234
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
235 int packet_length = ((recv_packet_header_buffer[0] & 0xff) << 24)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
236 | ((recv_packet_header_buffer[1] & 0xff) << 16) | ((recv_packet_header_buffer[2] & 0xff) << 8)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
237 | ((recv_packet_header_buffer[3] & 0xff));
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
238
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
239 int padding_length = recv_packet_header_buffer[4] & 0xff;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
240
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
241 if(packet_length > TransportManager.MAX_PACKET_SIZE || packet_length < 12) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
242 throw new PacketFormatException(String.format("Illegal packet size (%d)", packet_length));
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
243 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
244
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
245 int payload_length = packet_length - padding_length - 1;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
246
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
247 if(payload_length < 0) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
248 throw new PacketFormatException(String.format("Illegal padding_length in packet from remote (%d)", padding_length));
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
249 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
250
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
251 return payload_length;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
252 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
253
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
254 public int receiveMessage(byte buffer[], int off, int len) throws IOException {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
255 if(recv_packet_header_present == false) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
256 cis.read(recv_packet_header_buffer, 0, 5);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
257 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
258 else {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
259 recv_packet_header_present = false;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
260 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
261
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
262 int packet_length = ((recv_packet_header_buffer[0] & 0xff) << 24)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
263 | ((recv_packet_header_buffer[1] & 0xff) << 16) | ((recv_packet_header_buffer[2] & 0xff) << 8)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
264 | ((recv_packet_header_buffer[3] & 0xff));
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
265
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
266 int padding_length = recv_packet_header_buffer[4] & 0xff;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
267
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
268 if(packet_length > TransportManager.MAX_PACKET_SIZE || packet_length < 12) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
269 throw new PacketFormatException(String.format("Illegal packet size (%d)", packet_length));
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
270 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
271
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
272 int payload_length = packet_length - padding_length - 1;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
274 if(payload_length < 0) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
275 throw new PacketFormatException(String.format("Illegal padding_length in packet from remote (%d)", padding_length));
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
276 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
277
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
278 if(payload_length >= len) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
279 throw new IOException("Receive buffer too small (" + len + ", need " + payload_length + ")");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
280 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
281
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
282 cis.read(buffer, off, payload_length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
283 cis.read(recv_padding_buffer, 0, padding_length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
284
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
285 if(recv_mac != null) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
286 cis.readPlain(recv_mac_buffer, 0, recv_mac_buffer.length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
287
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
288 recv_mac.initMac(recv_seq_number);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
289 recv_mac.update(recv_packet_header_buffer, 0, 5);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
290 recv_mac.update(buffer, off, payload_length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
291 recv_mac.update(recv_padding_buffer, 0, padding_length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
292 recv_mac.getMac(recv_mac_buffer_cmp, 0);
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293
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294 for(int i = 0; i < recv_mac_buffer.length; i++) {
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295 if(recv_mac_buffer[i] != recv_mac_buffer_cmp[i]) {
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296 throw new IOException("Remote sent corrupt MAC.");
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297 }
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298 }
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299 }
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300
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301 recv_seq_number++;
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302
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303 if(log.isDebugEnabled()) {
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304 log.debug("Received " + Packets.getMessageName(buffer[off] & 0xff) + " " + payload_length
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305 + " bytes payload");
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306 }
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307
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308 if(recv_comp != null && can_compress) {
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309 int[] uncomp_len = new int[]{payload_length};
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310 buffer = recv_comp.uncompress(buffer, off, uncomp_len);
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311 return uncomp_len[0];
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312 }
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313 else {
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314 return payload_length;
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315 }
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316 }
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317
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318 public void startCompression() {
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319 can_compress = true;
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320 }
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parents:
diff changeset
321 }