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annotate svr-session.c @ 43:942b22d7dd1c

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 02 Aug 2004 04:25:05 +0000
parents 0ad5fb979f42
children 9ee8996a375f
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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 "session.h"
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27 #include "dbutil.h"
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28 #include "packet.h"
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29 #include "algo.h"
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30 #include "buffer.h"
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31 #include "dss.h"
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32 #include "ssh.h"
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33 #include "random.h"
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34 #include "kex.h"
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35 #include "channel.h"
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36 #include "chansession.h"
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37 #include "atomicio.h"
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38 #include "tcpfwd-direct.h"
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39 #include "service.h"
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40 #include "auth.h"
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41 #include "tcpfwd-remote.h"
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42 #include "runopts.h"
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43
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44 static void svr_remoteclosed();
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45
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46 struct serversession svr_ses; /* GLOBAL */
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47
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48 static const packettype svr_packettypes[] = {
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49 /* TYPE, AUTHREQUIRED, FUNCTION */
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50 {SSH_MSG_SERVICE_REQUEST, recv_msg_service_request}, // server
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51 {SSH_MSG_USERAUTH_REQUEST, recv_msg_userauth_request}, //server
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52 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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53 {SSH_MSG_KEXDH_INIT, recv_msg_kexdh_init}, // server
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54 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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55 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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56 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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57 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp},
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58 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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59 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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60 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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61 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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62 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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63 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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64 {0, 0} /* End */
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65 };
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66
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67 static const struct ChanType *svr_chantypes[] = {
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68 &svrchansess,
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69 &chan_tcpdirect,
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70 NULL /* Null termination is mandatory. */
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71 };
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72
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73 void svr_session(int sock, int childpipe, char* remotehost) {
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74
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75 struct timeval timeout;
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76
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77 crypto_init();
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78 common_session_init(sock, remotehost);
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79
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80 /* Initialise server specific parts of the session */
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81 svr_ses.childpipe = childpipe;
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82 svr_authinitialise();
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83 chaninitialise(svr_chantypes);
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84 svr_chansessinitialise();
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85
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86 if (gettimeofday(&timeout, 0) < 0) {
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87 dropbear_exit("Error getting time");
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88 }
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89
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90 ses.connecttimeout = timeout.tv_sec + AUTH_TIMEOUT;
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91
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92 /* set up messages etc */
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93 ses.remoteclosed = svr_remoteclosed;
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94
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95 /* packet handlers */
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96 ses.packettypes = svr_packettypes;
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97 ses.buf_match_algo = svr_buf_match_algo;
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98
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99 ses.isserver = 1;
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100
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101 /* We're ready to go now */
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102 sessinitdone = 1;
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103
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104 /* exchange identification, version etc */
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105 session_identification();
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106
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107 seedrandom();
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108
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109 /* start off with key exchange */
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110 send_msg_kexinit();
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111
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112 /* Run the main for loop. NULL is for the dispatcher - only the client
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113 * code makes use of it */
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114 session_loop(NULL);
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115
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116 /* Not reached */
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117
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118 }
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119
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120 /* failure exit - format must be <= 100 chars */
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121 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
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122
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123 char fmtbuf[300];
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124
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125 if (!sessinitdone) {
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126 /* before session init */
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127 snprintf(fmtbuf, sizeof(fmtbuf),
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128 "premature exit: %s", format);
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129 } else if (ses.authstate.authdone) {
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130 /* user has authenticated */
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131 snprintf(fmtbuf, sizeof(fmtbuf),
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132 "exit after auth (%s): %s",
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133 ses.authstate.printableuser, format);
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134 } else if (ses.authstate.printableuser) {
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135 /* we have a potential user */
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136 snprintf(fmtbuf, sizeof(fmtbuf),
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137 "exit before auth (user '%s', %d fails): %s",
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138 ses.authstate.printableuser, ses.authstate.failcount, format);
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139 } else {
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140 /* before userauth */
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141 snprintf(fmtbuf, sizeof(fmtbuf),
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142 "exit before auth: %s", format);
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143 }
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144
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145 _dropbear_log(LOG_INFO, fmtbuf, param);
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146
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147 /* must be after we've done with username etc */
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148 common_session_cleanup();
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149
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150 exit(exitcode);
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151
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152 }
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153
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154 /* priority is priority as with syslog() */
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155 void svr_dropbear_log(int priority, const char* format, va_list param) {
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156
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157 char printbuf[1024];
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158 char datestr[20];
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159 time_t timesec;
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160 int havetrace = 0;
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161
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162 vsnprintf(printbuf, sizeof(printbuf), format, param);
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163
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164 #ifndef DISABLE_SYSLOG
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165 if (svr_opts.usingsyslog) {
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166 syslog(priority, "%s", printbuf);
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167 }
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168 #endif
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169
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170 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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171 * syslog is used, so it is included in error reports */
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172 #ifdef DEBUG_TRACE
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173 havetrace = 1;
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174 #endif
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175
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176 if (!svr_opts.usingsyslog || havetrace)
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177 {
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178 timesec = time(NULL);
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179 if (strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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180 localtime(&timesec)) == 0) {
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181 datestr[0] = '?'; datestr[1] = '\0';
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182 }
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183 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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184 }
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185 }
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186
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187 /* called when the remote side closes the connection */
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188 static void svr_remoteclosed() {
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189
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190 close(ses.sock);
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191 ses.sock = -1;
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192 dropbear_close("Exited normally");
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193
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194 }
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195