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annotate app/src/main/java/ch/ethz/ssh2/transport/TransportConnection.java @ 500:11d714165a2d

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updates for android10+
author Carl Byington <carl@five-ten-sg.com>
date Tue, 07 Jun 2022 16:10:58 -0700
parents d29cce60f393
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 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
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96 if (recv_padd_blocksize < 8) {
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97 recv_padd_blocksize = 8;
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98 }
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99 }
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100
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101 public void changeSendCipher(BlockCipher bc, MAC mac) {
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102 if ((bc instanceof NullCipher) == false) {
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103 /* Only use zero byte padding for the first few packets */
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104 useRandomPadding = true;
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105 /* Once we start encrypting, there is no way back */
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106 }
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107
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108 cos.changeCipher(bc);
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109 send_mac = mac;
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110 send_mac_buffer = (mac != null) ? new byte[mac.size()] : null;
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111 send_padd_blocksize = bc.getBlockSize();
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112
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113 if (send_padd_blocksize < 8) {
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114 send_padd_blocksize = 8;
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115 }
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116 }
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117
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118 public void changeRecvCompression(Compressor comp) {
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119 recv_comp = comp;
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120
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121 if (comp != null) {
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122 recv_comp_buffer = new byte[comp.getBufferSize()];
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123 }
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124 }
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125
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126 public void changeSendCompression(Compressor comp) {
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127 send_comp = comp;
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128
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129 if (comp != null) {
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130 send_comp_buffer = new byte[comp.getBufferSize()];
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131 }
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132 }
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133
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134 public void sendMessage(byte[] message) throws IOException {
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135 sendMessage(message, 0, message.length, 0);
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136 }
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137
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138 public void sendMessage(byte[] message, int off, int len) throws IOException {
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139 sendMessage(message, off, len, 0);
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140 }
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141
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142 public int getPacketOverheadEstimate() {
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143 // return an estimate for the paket overhead (for send operations)
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144 return 5 + 4 + (send_padd_blocksize - 1) + send_mac_buffer.length;
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145 }
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146
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147 public void sendMessage(byte[] message, int off, int len, int padd) throws IOException {
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148 if (padd < 4) {
273
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
149 padd = 4;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
150 }
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
151 else if (padd > 64) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
152 padd = 64;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
153 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
155 if (send_comp != null && can_compress) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156 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
157 message = send_comp_buffer;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158 }
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 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
161 int slack = packet_len % send_padd_blocksize;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
162
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
163 if (slack != 0) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
164 packet_len += (send_padd_blocksize - slack);
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
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
167 if (packet_len < 16) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168 packet_len = 16;
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
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171 int padd_len = packet_len - (5 + len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
173 if (useRandomPadding) {
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
174 for (int i = 0; i < padd_len; i = i + 4) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175 /*
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176 * don't waste calls to rnd.nextInt() (by using only 8bit of the
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
177 * output). just believe me: even though we may write here up to 3
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
178 * bytes which won't be used, there is no "buffer overflow" (i.e.,
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
179 * arrayindexoutofbounds). the padding buffer is big enough =) (256
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
180 * bytes, and that is bigger than any current cipher block size + 64).
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
181 */
273
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;
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
184 send_padding_buffer[i + 1] = (byte)(r >> 8);
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
185 send_padding_buffer[i + 2] = (byte)(r >> 16);
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
186 send_padding_buffer[i + 3] = (byte)(r >> 24);
273
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 {
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
190 /* use zero padding for unencrypted traffic */
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
191 for (int i = 0; i < padd_len; i++) {
273
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 }
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
194
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
195 /* Actually this code is paranoid: we never filled any
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
196 * bytes into the padding buffer so far, therefore it should
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
197 * consist of zeros only.
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
198 */
273
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
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
201 send_packet_header_buffer[0] = (byte)((packet_len - 4) >> 24);
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
202 send_packet_header_buffer[1] = (byte)((packet_len - 4) >> 16);
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
203 send_packet_header_buffer[2] = (byte)((packet_len - 4) >> 8);
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
204 send_packet_header_buffer[3] = (byte)((packet_len - 4));
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205 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
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
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
210 if (send_mac != null) {
273
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 send_mac.getMac(send_mac_buffer, 0);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216 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
217 }
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 cos.flush();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
221 if (log.isDebugEnabled()) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 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
223 }
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 send_seq_number++;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226 }
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 public int peekNextMessageLength() throws IOException {
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
229 if (recv_packet_header_present == false) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230 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
231 recv_packet_header_present = true;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
233
372
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
234 int packet_length = ((recv_packet_header_buffer[0] & 0xff) << 24) |
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
235 ((recv_packet_header_buffer[1] & 0xff) << 16) |
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
236 ((recv_packet_header_buffer[2] & 0xff) << 8) |
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
237 ((recv_packet_header_buffer[3] & 0xff));
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
238 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
239
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
240 if (packet_length > TransportManager.MAX_PACKET_SIZE || packet_length < 12) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
241 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
242 }
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 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
245
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
246 if (payload_length < 0) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
247 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
248 }
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 return payload_length;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
251 }
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 public int receiveMessage(byte buffer[], int off, int len) throws IOException {
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
254 if (recv_packet_header_present == false) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
255 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
256 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
257 else {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
258 recv_packet_header_present = false;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
259 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
260
372
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
261 int packet_length = ((recv_packet_header_buffer[0] & 0xff) << 24) |
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
262 ((recv_packet_header_buffer[1] & 0xff) << 16) |
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
263 ((recv_packet_header_buffer[2] & 0xff) << 8) |
20d0a1356c43 debug kex error
Carl Byington <carl@five-ten-sg.com>
parents: 307
diff changeset
264 ((recv_packet_header_buffer[3] & 0xff));
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
265 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
266
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
267 if (packet_length > TransportManager.MAX_PACKET_SIZE || packet_length < 12) {
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
268 throw new PacketFormatException(String.format("Illegal packet size (%d)", packet_length));
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
269 }
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 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
272
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
273 if (payload_length < 0) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
274 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
275 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
276
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
277 if (payload_length >= len) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
278 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
279 }
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 cis.read(buffer, off, payload_length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
282 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
283
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
284 if (recv_mac != null) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
285 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
286 recv_mac.initMac(recv_seq_number);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
287 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
288 recv_mac.update(buffer, off, payload_length);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
289 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
290 recv_mac.getMac(recv_mac_buffer_cmp, 0);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
291
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
292 for (int i = 0; i < recv_mac_buffer.length; i++) {
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
293 if (recv_mac_buffer[i] != recv_mac_buffer_cmp[i]) {
273
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parents:
diff changeset
294 throw new IOException("Remote sent corrupt MAC.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
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295 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
296 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
297 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
298
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
299 recv_seq_number++;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
300
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
301 if (log.isDebugEnabled()) {
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
302 log.debug("Received " + Packets.getMessageName(buffer[off] & 0xff) + " " + payload_length
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
303 + " bytes payload");
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
304 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
305
307
071eccdff8ea fix java formatting
Carl Byington <carl@five-ten-sg.com>
parents: 273
diff changeset
306 if (recv_comp != null && can_compress) {
071eccdff8ea fix java formatting
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parents: 273
diff changeset
307 int[] uncomp_len = new int[] {payload_length};
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
308 buffer = recv_comp.uncompress(buffer, off, uncomp_len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
309 return uncomp_len[0];
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
310 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
311 else {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
312 return payload_length;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
313 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
314 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
315
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
316 public void startCompression() {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
317 can_compress = true;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
318 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
319 }