1 | /*****************************************************************************
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2 | *
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3 | * Copyright (c) 2000 - 2015, Lawrence Livermore National Security, LLC
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4 | * Produced at the Lawrence Livermore National Laboratory
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5 | * LLNL-CODE-442911
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6 | * All rights reserved.
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7 | *
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8 | * This file is part of VisIt. For details, see https://visit.llnl.gov/. The
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9 | * full copyright notice is contained in the file COPYRIGHT located at the root
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10 | * of the VisIt distribution or at http://www.llnl.gov/visit/copyright.html.
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11 | *
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12 | * Redistribution and use in source and binary forms, with or without
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13 | * modification, are permitted provided that the following conditions are met:
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14 | *
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15 | * - Redistributions of source code must retain the above copyright notice,
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16 | * this list of conditions and the disclaimer below.
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17 | * - Redistributions in binary form must reproduce the above copyright notice,
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18 | * this list of conditions and the disclaimer (as noted below) in the
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19 | * documentation and/or other materials provided with the distribution.
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20 | * - Neither the name of the LLNS/LLNL nor the names of its contributors may
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21 | * be used to endorse or promote products derived from this software without
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22 | * specific prior written permission.
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23 | *
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24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL LAWRENCE LIVERMORE NATIONAL SECURITY,
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28 | * LLC, THE U.S. DEPARTMENT OF ENERGY OR CONTRIBUTORS BE LIABLE FOR ANY
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29 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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31 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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32 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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35 | * DAMAGE.
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36 | *
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37 | *****************************************************************************/
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38 | #include <LaunchService.h>
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39 |
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40 | #include <cstdio>
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41 | #include <cstdlib>
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42 | #include <cstring>
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43 | #include <ctime>
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44 |
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45 | #if defined(_WIN32)
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46 | #include <process.h>
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47 | #include <winsock2.h>
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48 | #include <windows.h>
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49 | #else
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50 | #include <unistd.h> // alarm
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51 | #include <signal.h>
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52 | #include <sys/types.h>
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53 | #include <sys/wait.h>
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54 | #endif
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55 |
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56 | #include <DebugStream.h>
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57 | #include <FileFunctions.h>
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58 | #include <ParentProcess.h>
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59 | #include <VisItException.h>
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60 | #include <SocketBridge.h>
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61 | #include <SocketConnection.h>
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62 |
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63 | // Capture child output on UNIX & Mac.
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64 | #if !defined(_WIN32)
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65 | #define CAPTURE_CHILD_OUTPUT
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66 | #endif
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67 |
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68 | //
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69 | // Static member variables.
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70 | //
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71 | std::map<int, bool> LaunchService::childDied;
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72 |
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73 | // Pass this information to the thread to set up the bridge.
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74 | struct BridgeInfo
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75 | {
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76 | int newlocalport;
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77 | int oldlocalport;
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78 | int bufferSize;
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79 | bool logging;
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80 | };
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81 |
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82 | // ****************************************************************************
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83 | // Function: CreateSocketBridge
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84 | //
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85 | // Purpose:
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86 | // Initiate the socket bridge.
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87 | //
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88 | // Arguments:
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89 | // ports (really an int[2]):
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90 | // ports[0]=new local port
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91 | // ports[1]=old local port
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92 | //
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93 | // Programmer: Jeremy Meredith
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94 | // Creation: June 5, 2007
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95 | //
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96 | // Modifications:
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97 | // Thomas R. Treadway, Mon Oct 8 13:27:42 PDT 2007
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98 | // Backing out SSH tunneling on Panther (MacOS X 10.3)
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99 | //
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100 | // Brad Whitlock, Tue Oct 14 17:12:46 PDT 2014
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101 | // Pass the bridge set up information in a struct. Set the buffer size.
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102 | //
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103 | // ****************************************************************************
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104 | static void CreateSocketBridge(void *ptr)
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105 | {
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106 | BridgeInfo *info = (BridgeInfo *)ptr;
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107 | SocketBridge bridge(info->newlocalport, info->oldlocalport);
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108 | bridge.SetLogging(info->logging);
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109 | if(info->bufferSize > 0)
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110 | bridge.SetBufferSize(info->bufferSize);
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111 | bridge.Bridge();
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112 | }
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113 |
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114 | // ****************************************************************************
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115 | // Method: LaunchService::LaunchService
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116 | //
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117 | // Purpose:
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118 | // Constructor.
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119 | //
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120 | // Programmer: Brad Whitlock
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121 | // Creation: Mon Nov 28 17:11:19 PST 2011
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122 | //
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123 | // Modifications:
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124 | //
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125 | // ****************************************************************************
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126 |
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127 | LaunchService::LaunchService()
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128 | {
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129 | }
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130 |
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131 | // ****************************************************************************
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132 | // Method: LaunchService::~LaunchService
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133 | //
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134 | // Purpose:
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135 | // Destructor.
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136 | //
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137 | // Programmer: Brad Whitlock
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138 | // Creation: Mon Nov 28 17:11:19 PST 2011
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139 | //
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140 | // Modifications:
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141 | //
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142 | // ****************************************************************************
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143 |
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144 | LaunchService::~LaunchService()
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145 | {
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146 | }
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147 |
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148 | // ****************************************************************************
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149 | // Method: LaunchService::DeadChildHandler
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150 | //
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151 | // Purpose:
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152 | // Signal handler for a SIGCHLD even while waiting for remote connections.
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153 | // Catch a child that died and mark it's success or failure in the
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154 | // childDied array.
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155 | //
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156 | // Programmer: Brad Whitlock
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157 | // Creation: Mon May 5 11:18:55 PDT 2003
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158 | //
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159 | // Modifications:
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160 | //
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161 | // ****************************************************************************
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162 |
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163 | void
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164 | LaunchService::DeadChildHandler(int)
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165 | {
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166 | #if !defined(_WIN32)
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167 | int status;
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168 | int pid;
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169 | pid = wait(&status);
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170 |
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171 | childDied[pid] = (status == 0 ? false : true);
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172 |
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173 | signal(SIGCHLD, DeadChildHandler);
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174 | #endif
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175 | }
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176 |
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177 | // ****************************************************************************
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178 | // Method: LaunchService::SetupGatewaySocketBridgeIfNeeded
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179 | //
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180 | // Purpose:
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181 | // If SSH tunneling is enabled and we're about to launch a parallel
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182 | // engine, we need to set up a local port from any incoming host
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183 | // that gets forwarded through the appropriate SSH tunnel. We cannot
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184 | // access SSH tunnels at the login node for a cluster from the
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185 | // compute nodes, because by default SSH only listens for connections
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186 | // from localhost.
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187 | //
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188 | // The launch arguments containing the login node forward ("localhost":port)
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189 | // are also converted to the new bridge (loginnode:newport);
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190 | //
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191 | // Arguments:
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192 | // launchArgs the launch arguments (these will be modified in-place!)
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193 | //
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194 | // Programmer: Jeremy Meredith
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195 | // Creation: May 24, 2007
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196 | //
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197 | // Modifications:
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198 | // Thomas R. Treadway, Mon Oct 8 13:27:42 PDT 2007
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199 | // Backing out SSH tunneling on Panther (MacOS X 10.3)
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200 | //
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201 | // Brad Whitlock, Mon Apr 27 16:31:23 PST 2009
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202 | // I changed the routine so the check for setting up the bridge is passed
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203 | // in rather than calculated in here from launch arguments.
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204 | //
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205 | // Brad Whitlock, Tue Oct 14 17:16:31 PDT 2014
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206 | // Allow the buffer size to be passed in to the thread that makes the bridge.
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207 | //
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208 | // ****************************************************************************
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209 |
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210 | bool
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211 | LaunchService::SetupGatewaySocketBridgeIfNeeded(stringVector &launchArgs)
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212 | {
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213 | const char *mName="LaunchService::SetupGatewaySocketBridgeIfNeeded: ";
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214 |
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215 | // Get the port and host.
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216 | int oldlocalport = -1;
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217 | int portargument = -1;
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218 | int hostargument = -1;
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219 | int bufferSize = -1;
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220 | std::string sbHost;
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221 | for (size_t i=0; i<launchArgs.size(); i++)
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222 | {
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223 | if (i<launchArgs.size()-1 && launchArgs[i] == "-port")
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224 | {
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225 | oldlocalport = atoi(launchArgs[i+1].c_str());
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226 | portargument = i+1;
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227 | }
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228 | else if (i<launchArgs.size()-1 && launchArgs[i] == "-host")
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229 | {
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230 | hostargument = i+1;
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231 | }
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232 | else if (launchArgs[i] == "-fixed-buffer-sockets")
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233 | {
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234 | bufferSize = SocketConnection::FIXED_BUFFER_SIZE;
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235 | }
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236 | else if((i+1)<launchArgs.size() && launchArgs[i] == "-socket-bridge-host")
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237 | {
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238 | sbHost = launchArgs[i+1];
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239 | }
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240 | }
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241 |
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242 | bool setupBridge = (portargument != -1 && hostargument != -1);
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243 | if(setupBridge)
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244 | {
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245 | debug5 << mName << "Setting up gateway port bridge.\n";
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246 | // find a new local port
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247 | int lowerRemotePort = 10000;
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248 | int upperRemotePort = 40000;
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249 | int remotePortRange = 1+upperRemotePort-lowerRemotePort;
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250 |
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251 | #if defined(_WIN32)
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252 | srand((unsigned)time(0));
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253 | int newlocalport = lowerRemotePort+(rand()%remotePortRange);
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254 | #else
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255 | srand48(long(time(0)));
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256 | int newlocalport = lowerRemotePort+(lrand48()%remotePortRange);
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257 | #endif
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258 | debug5 << mName << "Bridging new port INADDR_ANY/" << newlocalport
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259 | << " to tunneled port localhost/" << oldlocalport << endl;
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260 |
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261 | // replace the host with my host name
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262 | if(sbHost.empty()) {
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263 | char hostname[1024];
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264 | gethostname(hostname,1024);
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265 | launchArgs[hostargument] = hostname;
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266 | }
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267 | else
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268 | launchArgs[hostargument] = sbHost;
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269 |
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270 | // replace the launch argument port number
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271 | char newportstr[10];
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272 | sprintf(newportstr,"%d",newlocalport);
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273 | launchArgs[portargument] = newportstr;
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274 |
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275 | // fork and start the socket bridge
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276 | BridgeInfo *info = new BridgeInfo;
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277 | info->newlocalport = newlocalport;
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278 | info->oldlocalport = oldlocalport;
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279 | info->bufferSize = bufferSize;
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280 | info->logging = DebugStream::Level1();
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281 | #ifdef _WIN32
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282 | _beginthread(CreateSocketBridge, 0, (void*)info);
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283 | #else
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284 | switch (fork())
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285 | {
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286 | case -1:
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287 | // Could not fork.
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288 | exit(-1); // HOOKS_IGNORE
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289 | break;
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290 | case 0:
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291 | {
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292 | // The child process will start the bridge
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293 | // Close stdin and any other file descriptors.
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294 | fclose(stdin);
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295 | for (int k = 3 ; k < 32 ; ++k)
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296 | {
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297 | close(k);
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298 | }
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299 | CreateSocketBridge((void*)info);
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300 | exit(0); // HOOKS_IGNORE
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301 | break;
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302 | }
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303 | default:
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304 | // Parent process continues on as normal
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305 | // Caution: there is a slight race condition here, though
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306 | // it would require the engine to launch and try to connect
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307 | // back before the child process got the bridge set up.
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308 | // The odds of this happening are low, but it should be fixed.
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309 | break;
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310 | }
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311 | #endif
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312 | }
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313 | else
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314 | {
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315 | debug5 << mName << "Required -host or -port argument not found" << endl;
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316 | }
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317 |
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318 | return setupBridge;
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319 | }
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320 |
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321 | // ****************************************************************************
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322 | // Method: LaunchService::LaunchProcess
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323 | //
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324 | // Purpose:
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325 | // Launch a process, optionally reading its output.
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326 | //
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327 | // Arguments:
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328 | //
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329 | // Returns:
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330 | //
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331 | // Note:
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332 | //
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333 | // Programmer: Brad Whitlock
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334 | // Creation: Mon Nov 28 17:07:30 PST 2011
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335 | //
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336 | // Modifications:
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337 | //
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338 | // ****************************************************************************
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339 |
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340 | void
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341 | LaunchService::Launch(const stringVector &origLaunchArgs, bool doBridge,
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342 | SocketConnection **conn)
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343 | {
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344 | const char *mName = "LaunchService::LaunchProcess: ";
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345 | debug1 << mName << "start" << endl;
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346 |
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347 | stringVector launchArgs(origLaunchArgs);
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348 | bool readOutput = conn != NULL;
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349 | if(readOutput)
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350 | *conn = NULL;
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351 |
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352 | if(launchArgs.empty())
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353 | return;
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354 |
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355 | // Set up a socket bridge if we need one.
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356 | if(doBridge)
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357 | SetupGatewaySocketBridgeIfNeeded(launchArgs);
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358 |
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359 | std::string remoteProgram(launchArgs[0]);
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360 | debug1 << mName << "LaunchRPC command = " << remoteProgram.c_str() << ", args=(";
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361 |
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362 | // Make a command line array for the exec functions.
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363 | char **args = new char *[launchArgs.size() + 1];
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364 | memset(args, 0, (launchArgs.size() + 1) * sizeof(char *));
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365 | for(size_t i = 0; i < launchArgs.size(); ++i)
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366 | {
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367 | args[i] = new char[launchArgs[i].size() + 1];
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368 | strcpy(args[i], launchArgs[i].c_str());
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369 | if(i > 0) {
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370 | debug1 << launchArgs[i].c_str() << " ";
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371 | }
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372 | }
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373 | debug1 << ")" << endl;
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374 |
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375 | // We have command line arguments for a command to launch.
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376 |
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377 | int remoteProgramPid = 0;
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378 | #if defined(_WIN32)
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379 | // Do it the WIN32 way where we use the _spawnvp system call.
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380 | remoteProgramPid = _spawnvp(_P_NOWAIT, remoteProgram.c_str(), args);
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381 | #else
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382 | // Watch for a process who died
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383 | childDied[remoteProgramPid] = false;
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384 | signal(SIGCHLD, DeadChildHandler);
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385 |
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386 | #ifdef CAPTURE_CHILD_OUTPUT
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387 | // Create a pipe.
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388 | int f_des[2];
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389 | if(pipe(f_des) == -1)
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390 | readOutput = false;
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391 | #endif
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392 |
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393 | switch (remoteProgramPid = fork())
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394 | {
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395 | case -1:
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396 | // Could not fork.
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397 | exit(-1); // HOOKS_IGNORE
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398 | break;
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399 | case 0:
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400 | // Close stdin and any other file descriptors.
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401 | fclose(stdin);
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402 | #ifdef CAPTURE_CHILD_OUTPUT
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403 | // Send the process' stdout/stderr to our pipe.
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404 | if(readOutput)
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405 | {
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406 | dup2(f_des[1], fileno(stdout));
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407 | dup2(f_des[1], fileno(stderr));
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408 | close(f_des[0]);
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409 | close(f_des[1]);
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410 | }
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411 | #endif
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412 | for (int k = 3 ; k < 32 ; ++k)
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413 | {
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414 | close(k);
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415 | }
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416 | // Execute the process on the local machine.
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417 | remoteProgram = FileFunctions::ExpandPath(remoteProgram);
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418 | execvp(remoteProgram.c_str(), args);
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419 | exit(-1); // HOOKS_IGNORE
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420 | break; // OCD
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421 | default:
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422 | #ifdef CAPTURE_CHILD_OUTPUT
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423 | if(readOutput)
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424 | close(f_des[1]);
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425 | #endif
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426 | break;
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427 | }
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428 |
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429 | // Stop watching for dead children
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430 | signal(SIGCHLD, SIG_DFL);
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431 |
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432 | // If we had a dead child, try and connect back to the client that
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433 | // wanted to connect to the dead child.
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434 | if(childDied[remoteProgramPid])
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435 | {
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436 | // Create a temp array of pointers to the strings that we
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437 | // created and pass the temp array to the TerminateConnectionRequest
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438 | // method because it creates a ParentProcess object that will
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439 | // rearrange the pointers in the array.
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440 | char **args2 = new char *[launchArgs.size() + 1];
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441 | for(size_t i = 0; i < launchArgs.size(); ++i)
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442 | args2[i] = args[i];
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443 |
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444 | // Tell the client that we could not connect.
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445 | TerminateConnectionRequest(launchArgs.size(), args2);
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446 |
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447 | delete [] args2;
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448 | }
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449 | #ifdef CAPTURE_CHILD_OUTPUT
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450 | else if(readOutput)
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451 | {
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452 | // Add the child's output pipe to the list of descriptors that
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453 | // we will check. We add the pipe file descriptor as a
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454 | // SocketConnection object.
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455 | *conn = new SocketConnection(f_des[0]);
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456 | }
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457 | #endif
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458 | #endif
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459 |
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460 | // Free the command line storage.
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461 | for(size_t i = 0; i < launchArgs.size(); ++i)
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462 | delete [] args[i];
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463 | delete [] args;
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464 | debug1 << mName << "end" << endl;
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465 | }
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466 |
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467 | // ****************************************************************************
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468 | // Method: LaunchService::TerminateConnectionRequest
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469 | //
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470 | // Purpose:
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471 | // Tells the client that we could not launch the desired process. This
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472 | // lets the client fail gracefully instead of hang.
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473 | //
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474 | // Arguments:
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475 | // argc : The number of arguments in argv.
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476 | // argv : The argument array used to connect back to the client.
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477 | //
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478 | // Programmer: Brad Whitlock
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479 | // Creation: Mon May 5 11:46:35 PDT 2003
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480 | //
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481 | // Modifications:
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482 | // Brad Whitlock, Tue Jul 29 11:39:03 PDT 2003
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483 | // Changed interface to ParentProcess::Connect.
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484 | //
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485 | // Mark C. Miller, Wed Jun 17 14:27:08 PDT 2009
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486 | // Replaced CATCHALL(...) with CATCHALL.
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487 | // ****************************************************************************
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488 |
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489 | void
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490 | LaunchService::TerminateConnectionRequest(int argc, char *argv[])
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491 | {
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492 | // Try and connect back to the process that initiated the request and
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493 | // send it a non-zero fail code so it will terminate the connection.
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494 | TRY
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495 | {
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496 | debug1 << "Terminating connection request to the client." << endl;
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497 |
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498 | ParentProcess killer;
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499 |
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500 | // Connect back to the process and say that we could not connect.
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501 | killer.Connect(1, 1, &argc, &argv, true, 3);
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502 | }
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503 | CATCHALL
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504 | {
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505 | // We know that we're going to get here, but no action is required.
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506 | }
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507 | ENDTRY
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508 | }
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