1 | /* |
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2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
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3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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4 | * All rights reserved |
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5 | * |
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6 | * As far as I am concerned, the code I have written for this software |
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7 | * can be used freely for any purpose. Any derived versions of this |
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8 | * software must be clearly marked as such, and if the derived work is |
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9 | * incompatible with the protocol description in the RFC file, it must be |
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10 | * called by a name other than "ssh" or "Secure Shell". |
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11 | */ |
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12 | |
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13 | /* |
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14 | * SSH2 tty modes support by Kevin Steves. |
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15 | * Copyright (c) 2001 Kevin Steves. All rights reserved. |
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16 | * |
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17 | * Redistribution and use in source and binary forms, with or without |
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18 | * modification, are permitted provided that the following conditions |
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19 | * are met: |
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20 | * 1. Redistributions of source code must retain the above copyright |
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21 | * notice, this list of conditions and the following disclaimer. |
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22 | * 2. Redistributions in binary form must reproduce the above copyright |
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23 | * notice, this list of conditions and the following disclaimer in the |
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24 | * documentation and/or other materials provided with the distribution. |
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25 | * |
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26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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36 | */ |
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37 | |
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38 | /* |
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39 | * Encoding and decoding of terminal modes in a portable way. |
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40 | * Much of the format is defined in ttymodes.h; it is included multiple times |
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41 | * into this file with the appropriate macro definitions to generate the |
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42 | * suitable code. |
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43 | */ |
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44 | |
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45 | #include "includes.h" |
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46 | RCSID("$OpenBSD: ttymodes.c,v 1.18 2002/06/19 00:27:55 deraadt Exp $"); |
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47 | |
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48 | #include "packet.h" |
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49 | #include "log.h" |
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50 | #include "ssh1.h" |
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51 | #include "compat.h" |
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52 | #include "buffer.h" |
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53 | #include "bufaux.h" |
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54 | |
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55 | #define TTY_OP_END 0 |
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56 | /* |
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57 | * uint32 (u_int) follows speed in SSH1 and SSH2 |
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58 | */ |
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59 | #define TTY_OP_ISPEED_PROTO1 192 |
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60 | #define TTY_OP_OSPEED_PROTO1 193 |
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61 | #define TTY_OP_ISPEED_PROTO2 128 |
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62 | #define TTY_OP_OSPEED_PROTO2 129 |
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63 | |
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64 | /* |
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65 | * Converts POSIX speed_t to a baud rate. The values of the |
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66 | * constants for speed_t are not themselves portable. |
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67 | */ |
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68 | static int |
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69 | speed_to_baud(speed_t speed) |
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70 | { |
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71 | switch (speed) { |
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72 | case B0: |
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73 | return 0; |
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74 | case B50: |
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75 | return 50; |
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76 | case B75: |
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77 | return 75; |
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78 | case B110: |
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79 | return 110; |
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80 | case B134: |
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81 | return 134; |
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82 | case B150: |
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83 | return 150; |
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84 | case B200: |
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85 | return 200; |
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86 | case B300: |
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87 | return 300; |
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88 | case B600: |
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89 | return 600; |
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90 | case B1200: |
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91 | return 1200; |
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92 | case B1800: |
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93 | return 1800; |
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94 | case B2400: |
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95 | return 2400; |
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96 | case B4800: |
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97 | return 4800; |
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98 | case B9600: |
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99 | return 9600; |
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100 | |
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101 | #ifdef B19200 |
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102 | case B19200: |
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103 | return 19200; |
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104 | #else /* B19200 */ |
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105 | #ifdef EXTA |
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106 | case EXTA: |
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107 | return 19200; |
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108 | #endif /* EXTA */ |
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109 | #endif /* B19200 */ |
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110 | |
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111 | #ifdef B38400 |
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112 | case B38400: |
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113 | return 38400; |
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114 | #else /* B38400 */ |
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115 | #ifdef EXTB |
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116 | case EXTB: |
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117 | return 38400; |
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118 | #endif /* EXTB */ |
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119 | #endif /* B38400 */ |
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120 | |
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121 | #ifdef B7200 |
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122 | case B7200: |
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123 | return 7200; |
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124 | #endif /* B7200 */ |
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125 | #ifdef B14400 |
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126 | case B14400: |
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127 | return 14400; |
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128 | #endif /* B14400 */ |
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129 | #ifdef B28800 |
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130 | case B28800: |
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131 | return 28800; |
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132 | #endif /* B28800 */ |
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133 | #ifdef B57600 |
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134 | case B57600: |
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135 | return 57600; |
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136 | #endif /* B57600 */ |
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137 | #ifdef B76800 |
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138 | case B76800: |
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139 | return 76800; |
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140 | #endif /* B76800 */ |
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141 | #ifdef B115200 |
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142 | case B115200: |
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143 | return 115200; |
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144 | #endif /* B115200 */ |
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145 | #ifdef B230400 |
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146 | case B230400: |
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147 | return 230400; |
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148 | #endif /* B230400 */ |
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149 | default: |
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150 | return 9600; |
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151 | } |
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152 | } |
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153 | |
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154 | /* |
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155 | * Converts a numeric baud rate to a POSIX speed_t. |
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156 | */ |
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157 | static speed_t |
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158 | baud_to_speed(int baud) |
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159 | { |
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160 | switch (baud) { |
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161 | case 0: |
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162 | return B0; |
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163 | case 50: |
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164 | return B50; |
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165 | case 75: |
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166 | return B75; |
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167 | case 110: |
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168 | return B110; |
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169 | case 134: |
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170 | return B134; |
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171 | case 150: |
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172 | return B150; |
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173 | case 200: |
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174 | return B200; |
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175 | case 300: |
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176 | return B300; |
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177 | case 600: |
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178 | return B600; |
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179 | case 1200: |
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180 | return B1200; |
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181 | case 1800: |
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182 | return B1800; |
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183 | case 2400: |
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184 | return B2400; |
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185 | case 4800: |
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186 | return B4800; |
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187 | case 9600: |
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188 | return B9600; |
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189 | |
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190 | #ifdef B19200 |
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191 | case 19200: |
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192 | return B19200; |
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193 | #else /* B19200 */ |
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194 | #ifdef EXTA |
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195 | case 19200: |
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196 | return EXTA; |
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197 | #endif /* EXTA */ |
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198 | #endif /* B19200 */ |
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199 | |
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200 | #ifdef B38400 |
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201 | case 38400: |
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202 | return B38400; |
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203 | #else /* B38400 */ |
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204 | #ifdef EXTB |
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205 | case 38400: |
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206 | return EXTB; |
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207 | #endif /* EXTB */ |
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208 | #endif /* B38400 */ |
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209 | |
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210 | #ifdef B7200 |
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211 | case 7200: |
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212 | return B7200; |
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213 | #endif /* B7200 */ |
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214 | #ifdef B14400 |
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215 | case 14400: |
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216 | return B14400; |
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217 | #endif /* B14400 */ |
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218 | #ifdef B28800 |
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219 | case 28800: |
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220 | return B28800; |
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221 | #endif /* B28800 */ |
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222 | #ifdef B57600 |
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223 | case 57600: |
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224 | return B57600; |
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225 | #endif /* B57600 */ |
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226 | #ifdef B76800 |
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227 | case 76800: |
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228 | return B76800; |
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229 | #endif /* B76800 */ |
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230 | #ifdef B115200 |
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231 | case 115200: |
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232 | return B115200; |
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233 | #endif /* B115200 */ |
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234 | #ifdef B230400 |
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235 | case 230400: |
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236 | return B230400; |
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237 | #endif /* B230400 */ |
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238 | default: |
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239 | return B9600; |
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240 | } |
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241 | } |
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242 | |
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243 | /* |
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244 | * Encodes terminal modes for the terminal referenced by fd |
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245 | * or tiop in a portable manner, and appends the modes to a packet |
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246 | * being constructed. |
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247 | */ |
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248 | void |
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249 | tty_make_modes(int fd, struct termios *tiop) |
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250 | { |
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251 | struct termios tio; |
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252 | int baud; |
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253 | Buffer buf; |
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254 | int tty_op_ospeed, tty_op_ispeed; |
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255 | void (*put_arg)(Buffer *, u_int); |
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256 | |
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257 | buffer_init(&buf); |
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258 | if (compat20) { |
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259 | tty_op_ospeed = TTY_OP_OSPEED_PROTO2; |
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260 | tty_op_ispeed = TTY_OP_ISPEED_PROTO2; |
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261 | put_arg = buffer_put_int; |
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262 | } else { |
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263 | tty_op_ospeed = TTY_OP_OSPEED_PROTO1; |
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264 | tty_op_ispeed = TTY_OP_ISPEED_PROTO1; |
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265 | put_arg = (void (*)(Buffer *, u_int)) buffer_put_char; |
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266 | } |
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267 | |
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268 | if (tiop == NULL) { |
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269 | if (tcgetattr(fd, &tio) == -1) { |
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270 | log("tcgetattr: %.100s", strerror(errno)); |
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271 | goto end; |
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272 | } |
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273 | } else |
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274 | tio = *tiop; |
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275 | |
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276 | /* Store input and output baud rates. */ |
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277 | baud = speed_to_baud(cfgetospeed(&tio)); |
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278 | debug3("tty_make_modes: ospeed %d", baud); |
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279 | buffer_put_char(&buf, tty_op_ospeed); |
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280 | buffer_put_int(&buf, baud); |
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281 | baud = speed_to_baud(cfgetispeed(&tio)); |
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282 | debug3("tty_make_modes: ispeed %d", baud); |
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283 | buffer_put_char(&buf, tty_op_ispeed); |
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284 | buffer_put_int(&buf, baud); |
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285 | |
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286 | /* Store values of mode flags. */ |
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287 | #define TTYCHAR(NAME, OP) \ |
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288 | debug3("tty_make_modes: %d %d", OP, tio.c_cc[NAME]); \ |
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289 | buffer_put_char(&buf, OP); \ |
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290 | put_arg(&buf, tio.c_cc[NAME]); |
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291 | |
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292 | #define TTYMODE(NAME, FIELD, OP) \ |
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293 | debug3("tty_make_modes: %d %d", OP, ((tio.FIELD & NAME) != 0)); \ |
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294 | buffer_put_char(&buf, OP); \ |
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295 | put_arg(&buf, ((tio.FIELD & NAME) != 0)); |
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296 | |
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297 | #include "ttymodes.h" |
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298 | |
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299 | #undef TTYCHAR |
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300 | #undef TTYMODE |
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301 | |
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302 | end: |
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303 | /* Mark end of mode data. */ |
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304 | buffer_put_char(&buf, TTY_OP_END); |
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305 | if (compat20) |
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306 | packet_put_string(buffer_ptr(&buf), buffer_len(&buf)); |
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307 | else |
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308 | packet_put_raw(buffer_ptr(&buf), buffer_len(&buf)); |
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309 | buffer_free(&buf); |
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310 | } |
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311 | |
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312 | /* |
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313 | * Decodes terminal modes for the terminal referenced by fd in a portable |
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314 | * manner from a packet being read. |
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315 | */ |
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316 | void |
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317 | tty_parse_modes(int fd, int *n_bytes_ptr) |
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318 | { |
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319 | struct termios tio; |
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320 | int opcode, baud; |
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321 | int n_bytes = 0; |
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322 | int failure = 0; |
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323 | u_int (*get_arg)(void); |
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324 | int arg, arg_size; |
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325 | |
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326 | if (compat20) { |
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327 | *n_bytes_ptr = packet_get_int(); |
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328 | debug3("tty_parse_modes: SSH2 n_bytes %d", *n_bytes_ptr); |
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329 | if (*n_bytes_ptr == 0) |
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330 | return; |
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331 | get_arg = packet_get_int; |
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332 | arg_size = 4; |
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333 | } else { |
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334 | get_arg = packet_get_char; |
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335 | arg_size = 1; |
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336 | } |
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337 | |
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338 | /* |
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339 | * Get old attributes for the terminal. We will modify these |
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340 | * flags. I am hoping that if there are any machine-specific |
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341 | * modes, they will initially have reasonable values. |
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342 | */ |
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343 | if (tcgetattr(fd, &tio) == -1) { |
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344 | log("tcgetattr: %.100s", strerror(errno)); |
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345 | failure = -1; |
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346 | } |
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347 | |
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348 | for (;;) { |
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349 | n_bytes += 1; |
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350 | opcode = packet_get_char(); |
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351 | switch (opcode) { |
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352 | case TTY_OP_END: |
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353 | goto set; |
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354 | |
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355 | /* XXX: future conflict possible */ |
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356 | case TTY_OP_ISPEED_PROTO1: |
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357 | case TTY_OP_ISPEED_PROTO2: |
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358 | n_bytes += 4; |
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359 | baud = packet_get_int(); |
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360 | debug3("tty_parse_modes: ispeed %d", baud); |
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361 | if (failure != -1 && cfsetispeed(&tio, baud_to_speed(baud)) == -1) |
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362 | error("cfsetispeed failed for %d", baud); |
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363 | break; |
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364 | |
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365 | /* XXX: future conflict possible */ |
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366 | case TTY_OP_OSPEED_PROTO1: |
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367 | case TTY_OP_OSPEED_PROTO2: |
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368 | n_bytes += 4; |
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369 | baud = packet_get_int(); |
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370 | debug3("tty_parse_modes: ospeed %d", baud); |
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371 | if (failure != -1 && cfsetospeed(&tio, baud_to_speed(baud)) == -1) |
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372 | error("cfsetospeed failed for %d", baud); |
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373 | break; |
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374 | |
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375 | #define TTYCHAR(NAME, OP) \ |
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376 | case OP: \ |
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377 | n_bytes += arg_size; \ |
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378 | tio.c_cc[NAME] = get_arg(); \ |
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379 | debug3("tty_parse_modes: %d %d", OP, tio.c_cc[NAME]); \ |
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380 | break; |
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381 | #define TTYMODE(NAME, FIELD, OP) \ |
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382 | case OP: \ |
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383 | n_bytes += arg_size; \ |
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384 | if ((arg = get_arg())) \ |
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385 | tio.FIELD |= NAME; \ |
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386 | else \ |
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387 | tio.FIELD &= ~NAME; \ |
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388 | debug3("tty_parse_modes: %d %d", OP, arg); \ |
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389 | break; |
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390 | |
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391 | #include "ttymodes.h" |
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392 | |
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393 | #undef TTYCHAR |
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394 | #undef TTYMODE |
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395 | |
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396 | default: |
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397 | debug("Ignoring unsupported tty mode opcode %d (0x%x)", |
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398 | opcode, opcode); |
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399 | if (!compat20) { |
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400 | /* |
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401 | * SSH1: |
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402 | * Opcodes 1 to 127 are defined to have |
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403 | * a one-byte argument. |
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404 | * Opcodes 128 to 159 are defined to have |
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405 | * an integer argument. |
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406 | */ |
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407 | if (opcode > 0 && opcode < 128) { |
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408 | n_bytes += 1; |
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409 | (void) packet_get_char(); |
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410 | break; |
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411 | } else if (opcode >= 128 && opcode < 160) { |
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412 | n_bytes += 4; |
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413 | (void) packet_get_int(); |
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414 | break; |
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415 | } else { |
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416 | /* |
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417 | * It is a truly undefined opcode (160 to 255). |
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418 | * We have no idea about its arguments. So we |
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419 | * must stop parsing. Note that some data may be |
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420 | * left in the packet; hopefully there is nothing |
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421 | * more coming after the mode data. |
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422 | */ |
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423 | log("parse_tty_modes: unknown opcode %d", opcode); |
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424 | goto set; |
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425 | } |
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426 | } else { |
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427 | /* |
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428 | * SSH2: |
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429 | * Opcodes 1 to 159 are defined to have |
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430 | * a uint32 argument. |
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431 | * Opcodes 160 to 255 are undefined and |
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432 | * cause parsing to stop. |
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433 | */ |
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434 | if (opcode > 0 && opcode < 160) { |
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435 | n_bytes += 4; |
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436 | (void) packet_get_int(); |
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437 | break; |
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438 | } else { |
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439 | log("parse_tty_modes: unknown opcode %d", opcode); |
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440 | goto set; |
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441 | } |
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442 | } |
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443 | } |
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444 | } |
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445 | |
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446 | set: |
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447 | if (*n_bytes_ptr != n_bytes) { |
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448 | *n_bytes_ptr = n_bytes; |
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449 | log("parse_tty_modes: n_bytes_ptr != n_bytes: %d %d", |
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450 | *n_bytes_ptr, n_bytes); |
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451 | return; /* Don't process bytes passed */ |
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452 | } |
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453 | if (failure == -1) |
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454 | return; /* Packet parsed ok but tcgetattr() failed */ |
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455 | |
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456 | /* Set the new modes for the terminal. */ |
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457 | if (tcsetattr(fd, TCSANOW, &tio) == -1) |
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458 | log("Setting tty modes failed: %.100s", strerror(errno)); |
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459 | } |
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