Mercurial > dropbear

annotate svr-packet.c @ 11:f76c9389e9e0

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Mostly done with the listener changeover
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Jun 2004 17:22:48 +0000
parents fe6bca95afa7
children db2c8e6fb284
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "packet.h"
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27 #include "session.h"
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28 #include "dbutil.h"
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29 #include "ssh.h"
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30 #include "algo.h"
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31 #include "buffer.h"
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32 #include "kex.h"
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33 #include "random.h"
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34 #include "service.h"
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35 #include "auth.h"
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36 #include "channel.h"
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37
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38 static void svr_process_postauth_packet(unsigned int type);
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39
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40 /* process a decrypted packet, call the appropriate handler */
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41 void svr_process_packet() {
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42
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43 unsigned char type;
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44
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45 TRACE(("enter process_packet"));
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46
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47 type = buf_getbyte(ses.payload);
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48 TRACE(("process_packet: packet type = %d", type));
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49
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50 /* these packets we can receive at any time, regardless of expecting
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51 * other packets: */
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52 switch(type) {
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53
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54 case SSH_MSG_IGNORE:
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55 case SSH_MSG_DEBUG:
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56 TRACE(("received SSH_MSG_IGNORE or SSH_MSG_DEBUG"));
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57 goto out;
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58
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59 case SSH_MSG_UNIMPLEMENTED:
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60 /* debugging XXX */
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61 TRACE(("SSH_MSG_UNIMPLEMENTED"));
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62 dropbear_exit("received SSH_MSG_UNIMPLEMENTED");
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63
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64 case SSH_MSG_DISCONNECT:
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65 /* TODO cleanup? */
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66 dropbear_close("Disconnect received");
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67 }
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68
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69 /* Check if we should ignore this packet. Used currently only for
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70 * KEX code, with first_kex_packet_follows */
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71 if (ses.ignorenext) {
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72 TRACE(("Ignoring packet, type = %d", type));
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73 ses.ignorenext = 0;
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74 goto out;
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75 }
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76
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77 /* check that we aren't expecting a particular packet */
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78 if (ses.expecting && ses.expecting != type) {
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79 /* TODO send disconnect? */
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80 dropbear_exit("unexpected packet type %d, expected %d", type,
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81 ses.expecting);
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82 }
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83
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84 /* handle the packet depending on type */
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85 ses.expecting = 0;
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86
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87 switch (type) {
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88
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89 case SSH_MSG_SERVICE_REQUEST:
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90 recv_msg_service_request();
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91 break;
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92
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93 case SSH_MSG_USERAUTH_REQUEST:
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94 recv_msg_userauth_request();
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95 break;
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96
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97 case SSH_MSG_KEXINIT:
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98 recv_msg_kexinit();
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99 break;
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100
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101 case SSH_MSG_KEXDH_INIT:
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102 recv_msg_kexdh_init();
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103 break;
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104
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105 case SSH_MSG_NEWKEYS:
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106 recv_msg_newkeys();
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107 break;
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108
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109 /* this is ugly, need to make a cleaner way to do it */
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110 case SSH_MSG_CHANNEL_DATA:
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111 case SSH_MSG_CHANNEL_WINDOW_ADJUST:
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112 case SSH_MSG_CHANNEL_REQUEST:
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113 case SSH_MSG_CHANNEL_OPEN:
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114 case SSH_MSG_CHANNEL_EOF:
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115 case SSH_MSG_CHANNEL_CLOSE:
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116 case SSH_MSG_CHANNEL_OPEN_CONFIRMATION:
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117 case SSH_MSG_CHANNEL_OPEN_FAILURE:
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118 case SSH_MSG_GLOBAL_REQUEST:
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119 /* these should be checked for authdone below */
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120 svr_process_postauth_packet(type);
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121 break;
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122
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123 default:
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124 /* TODO this possibly should be handled */
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125 TRACE(("preauth unknown packet"));
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126 recv_unimplemented();
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127 break;
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128 }
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129
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130 out:
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131 buf_free(ses.payload);
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132 ses.payload = NULL;
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133
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134 TRACE(("leave process_packet"));
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135 }
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136
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137 /* process a packet, and also check that auth has been done */
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138 static void svr_process_postauth_packet(unsigned int type) {
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139
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140 /* messages following here require userauth before use */
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141
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142 /* IF YOU ADD MORE PACKET TYPES, MAKE SURE THEY'RE ALSO ADDED TO THE LIST
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143 * IN process_packet() XXX XXX XXX */
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144 if (!svr_ses.authstate.authdone) {
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145 dropbear_exit("received message %d before userauth", type);
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146 }
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147
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148 switch (type) {
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149
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150 case SSH_MSG_CHANNEL_DATA:
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151 recv_msg_channel_data();
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152 break;
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153
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154 case SSH_MSG_CHANNEL_WINDOW_ADJUST:
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155 recv_msg_channel_window_adjust();
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156 break;
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157
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158 #ifndef DISABLE_REMOTETCPFWD
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159 case SSH_MSG_GLOBAL_REQUEST:
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160 /* currently only used for remote tcp, so we cheat a little */
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161 recv_msg_global_request_remotetcp();
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162 break;
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163 #endif
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164
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165 case SSH_MSG_CHANNEL_REQUEST:
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166 recv_msg_channel_request();
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167 break;
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168
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169 case SSH_MSG_CHANNEL_OPEN:
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170 recv_msg_channel_open();
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171 break;
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172
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173 case SSH_MSG_CHANNEL_EOF:
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174 recv_msg_channel_eof();
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175 break;
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176
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177 case SSH_MSG_CHANNEL_CLOSE:
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178 recv_msg_channel_close();
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179 break;
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180
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181 #ifdef USE_LISTENERS /* for x11, tcp fwd etc */
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182 case SSH_MSG_CHANNEL_OPEN_CONFIRMATION:
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183 recv_msg_channel_open_confirmation();
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184 break;
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185
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186 case SSH_MSG_CHANNEL_OPEN_FAILURE:
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187 recv_msg_channel_open_failure();
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188 break;
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189 #endif
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190
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191 default:
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192 TRACE(("unknown packet()"));
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193 recv_unimplemented();
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194 break;
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195 }
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196 }