1 | /* $Id: main.cpp 68562 2017-08-31 12:10:16Z vboxsync $ */
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2 | /** @file
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3 | * VirtualBox Guest Additions - X11 Client.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2016 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 | #include <sys/types.h>
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19 | #include <sys/wait.h>
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20 | #include <stdlib.h> /* For exit */
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21 | #include <stdio.h>
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22 | #include <string.h>
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23 | #include <unistd.h>
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24 | #include <errno.h>
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25 | #include <poll.h>
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26 | #include <signal.h>
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27 |
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28 | #include <X11/Xlib.h>
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29 | #include <X11/Xatom.h>
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30 |
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31 | #include <iprt/buildconfig.h>
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32 | #include <iprt/critsect.h>
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33 | #include <iprt/env.h>
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34 | #include <iprt/file.h>
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35 | #include <iprt/initterm.h>
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36 | #include <iprt/message.h>
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37 | #include <iprt/path.h>
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38 | #include <iprt/param.h>
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39 | #include <iprt/stream.h>
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40 | #include <iprt/string.h>
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41 | #include <iprt/types.h>
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42 | #include <VBox/VBoxGuestLib.h>
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43 | #include <VBox/log.h>
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44 |
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45 | #include "VBoxClient.h"
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46 |
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47 | /*static int (*gpfnOldIOErrorHandler)(Display *) = NULL; - unused */
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48 |
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49 | /** Object representing the service we are running. This has to be global
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50 | * so that the cleanup routine can access it. */
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51 | struct VBCLSERVICE **g_pService;
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52 | /** The name of our pidfile. It is global for the benefit of the cleanup
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53 | * routine. */
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54 | static char g_szPidFile[RTPATH_MAX] = "";
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55 | /** The file handle of our pidfile. It is global for the benefit of the
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56 | * cleanup routine. */
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57 | static RTFILE g_hPidFile;
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58 | /** Global critical section held during the clean-up routine (to prevent it
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59 | * being called on multiple threads at once) or things which may not happen
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60 | * during clean-up (e.g. pausing and resuming the service).
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61 | */
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62 | RTCRITSECT g_critSect;
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63 | /** Counter of how often our deamon has been respawned. */
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64 | unsigned cRespawn = 0;
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65 |
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66 | /**
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67 | * Exit with a fatal error.
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68 | *
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69 | * This is used by the VBClFatalError macro and thus needs to be external.
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70 | */
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71 | void vbclFatalError(char *pszMessage)
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72 | {
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73 | char *pszCommand;
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74 | int status;
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75 | if (pszMessage && cRespawn == 0)
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76 | {
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77 | pszCommand = RTStrAPrintf2("notify-send \"VBoxClient: %s\"", pszMessage);
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78 | if (pszCommand)
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79 | {
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80 | status = system(pszCommand);
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81 | if (WEXITSTATUS(status) != 0) /* Utility or extension not available. */
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82 | {
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83 | pszCommand = RTStrAPrintf2("xmessage -buttons OK:0 -center \"VBoxClient: %s\"",
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84 | pszMessage);
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85 | if (pszCommand)
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86 | {
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87 | status = system(pszCommand);
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88 | if (WEXITSTATUS(status) != 0) /* Utility or extension not available. */
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89 | {
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90 | RTPrintf("VBoxClient: %s", pszMessage);
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91 | }
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92 | }
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93 | }
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94 | }
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95 | }
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96 | _exit(RTEXITCODE_FAILURE);
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97 | }
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98 |
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99 | /**
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100 | * Clean up if we get a signal or something.
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101 | *
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102 | * This is extern so that we can call it from other compilation units.
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103 | */
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104 | void VBClCleanUp(bool fExit /*=true*/)
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105 | {
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106 | /* We never release this, as we end up with a call to exit(3) which is not
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107 | * async-safe. Unless we fix this application properly, we should be sure
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108 | * never to exit from anywhere except from this method. */
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109 | int rc = RTCritSectEnter(&g_critSect);
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110 | if (RT_FAILURE(rc))
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111 | VBClFatalError(("VBoxClient: Failure while acquiring the global critical section, rc=%Rrc\n", rc));
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112 | if (g_pService)
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113 | (*g_pService)->cleanup(g_pService);
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114 | if (g_szPidFile[0] && g_hPidFile)
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115 | VbglR3ClosePidFile(g_szPidFile, g_hPidFile);
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116 | if (fExit)
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117 | exit(RTEXITCODE_SUCCESS);
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118 | }
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119 |
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120 | /**
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121 | * A standard signal handler which cleans up and exits.
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122 | */
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123 | static void vboxClientSignalHandler(int cSignal)
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124 | {
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125 | LogRel(("VBoxClient: terminated with signal %d\n", cSignal));
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126 | /** Disable seamless mode */
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127 | RTPrintf(("VBoxClient: terminating...\n"));
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128 | VBClCleanUp();
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129 | }
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130 |
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131 | /**
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132 | * Xlib error handler for certain errors that we can't avoid.
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133 | */
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134 | static int vboxClientXLibErrorHandler(Display *pDisplay, XErrorEvent *pError)
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135 | {
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136 | char errorText[1024];
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137 |
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138 | XGetErrorText(pDisplay, pError->error_code, errorText, sizeof(errorText));
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139 | LogRelFlow(("VBoxClient: an X Window protocol error occurred: %s (error code %d). Request code: %d, minor code: %d, serial number: %d\n", errorText, pError->error_code, pError->request_code, pError->minor_code, pError->serial));
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140 | return 0;
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141 | }
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142 |
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143 | /**
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144 | * Xlib error handler for fatal errors. This often means that the programme is still running
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145 | * when X exits.
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146 | */
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147 | static int vboxClientXLibIOErrorHandler(Display *pDisplay)
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148 | {
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149 | RT_NOREF1(pDisplay);
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150 | LogRel(("VBoxClient: a fatal guest X Window error occurred. This may just mean that the Window system was shut down while the client was still running.\n"));
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151 | VBClCleanUp();
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152 | return 0; /* We should never reach this. */
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153 | }
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154 |
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155 | /**
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156 | * Reset all standard termination signals to call our signal handler, which
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157 | * cleans up and exits.
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158 | */
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159 | static void vboxClientSetSignalHandlers(void)
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160 | {
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161 | struct sigaction sigAction;
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162 |
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163 | LogRelFlowFunc(("\n"));
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164 | sigAction.sa_handler = vboxClientSignalHandler;
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165 | sigemptyset(&sigAction.sa_mask);
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166 | sigAction.sa_flags = 0;
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167 | sigaction(SIGHUP, &sigAction, NULL);
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168 | sigaction(SIGINT, &sigAction, NULL);
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169 | sigaction(SIGQUIT, &sigAction, NULL);
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170 | sigaction(SIGPIPE, &sigAction, NULL);
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171 | sigaction(SIGALRM, &sigAction, NULL);
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172 | sigaction(SIGTERM, &sigAction, NULL);
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173 | sigaction(SIGUSR1, &sigAction, NULL);
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174 | sigaction(SIGUSR2, &sigAction, NULL);
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175 | LogRelFlowFunc(("returning\n"));
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176 | }
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177 |
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178 | /**
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179 | * Print out a usage message and exit with success.
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180 | */
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181 | static void vboxClientUsage(const char *pcszFileName)
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182 | {
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183 | RTPrintf("Usage: %s --clipboard|"
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184 | #ifdef VBOX_WITH_DRAG_AND_DROP
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185 | "--draganddrop|"
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186 | #endif
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187 | "--display|"
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188 | # ifdef VBOX_WITH_GUEST_PROPS
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189 | "--checkhostversion|"
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190 | #endif
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191 | "--seamless|check3d|"
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192 | "--vmsvga [-d|--nodaemon]\n", pcszFileName);
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193 | RTPrintf("Starts the VirtualBox DRM/X Window System guest services.\n\n");
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194 | RTPrintf("Options:\n");
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195 | RTPrintf(" --clipboard starts the shared clipboard service\n");
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196 | #ifdef VBOX_WITH_DRAG_AND_DROP
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197 | RTPrintf(" --draganddrop starts the drag and drop service\n");
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198 | #endif
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199 | RTPrintf(" --display starts the display management service\n");
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200 | #ifdef VBOX_WITH_GUEST_PROPS
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201 | RTPrintf(" --checkhostversion starts the host version notifier service\n");
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202 | #endif
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203 | RTPrintf(" --check3d tests whether 3D pass-through is enabled\n");
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204 | RTPrintf(" --seamless starts the seamless windows service\n");
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205 | RTPrintf(" --vmsvga starts VMSVGA dynamic resizing for DRM or for X11\n");
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206 | RTPrintf(" -f, --foreground run in the foreground (no daemonizing)\n");
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207 | RTPrintf(" -d, --nodaemon continues running as a system service\n");
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208 | RTPrintf(" -h, --help shows this help text\n");
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209 | RTPrintf(" -V, --version shows version information\n");
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210 | RTPrintf("\n");
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211 | }
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212 |
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213 | /**
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214 | * Complains about seeing more than one service specification.
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215 | *
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216 | * @returns RTEXITCODE_SYNTAX.
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217 | */
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218 | static int vbclSyntaxOnlyOneService(void)
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219 | {
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220 | RTMsgError("More than one service specified! Only one, please.");
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221 | return RTEXITCODE_SYNTAX;
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222 | }
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223 |
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224 | /**
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225 | * The main loop for the VBoxClient daemon.
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226 | * @todo Clean up for readability.
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227 | */
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228 | int main(int argc, char *argv[])
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229 | {
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230 | /* Initialise our runtime before all else. */
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231 | int rc = RTR3InitExe(argc, &argv, 0);
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232 | if (RT_FAILURE(rc))
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233 | return RTMsgInitFailure(rc);
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234 |
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235 | /* This should never be called twice in one process - in fact one Display
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236 | * object should probably never be used from multiple threads anyway. */
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237 | if (!XInitThreads())
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238 | VBClFatalError(("Failed to initialize X11 threads\n"));
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239 |
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240 | /* Get our file name for usage info and hints. */
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241 | const char *pcszFileName = RTPathFilename(argv[0]);
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242 | if (!pcszFileName)
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243 | pcszFileName = "VBoxClient";
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244 |
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245 | /* Parse our option(s) */
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246 | /** @todo Use RTGetOpt() if the arguments become more complex. */
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247 | bool fDaemonise = true;
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248 | bool fRespawn = true;
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249 | for (int i = 1; i < argc; ++i)
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250 | {
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251 | if ( !strcmp(argv[i], "-f")
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252 | || !strcmp(argv[i], "--foreground")
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253 | || !strcmp(argv[i], "-d")
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254 | || !strcmp(argv[i], "--nodaemon"))
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255 | {
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256 | /* If the user is running in "no daemon" mode anyway, send critical
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257 | * logging to stdout as well. */
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258 | /** @todo r=bird: Since the release logger isn't created until the service
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259 | * calls VbglR3InitUser or VbglR3Init or RTLogCreate, this whole
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260 | * exercise is pointless. Added --init-vbgl-user and --init-vbgl-full
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261 | * for getting some work done. */
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262 | PRTLOGGER pReleaseLog = RTLogRelGetDefaultInstance();
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263 | if (pReleaseLog)
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264 | rc = RTLogDestinations(pReleaseLog, "stdout");
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265 | if (pReleaseLog && RT_FAILURE(rc))
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266 | return RTMsgErrorExitFailure("failed to redivert error output, rc=%Rrc", rc);
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267 |
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268 | fDaemonise = false;
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269 | if ( !strcmp(argv[i], "-f")
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270 | || !strcmp(argv[i], "--foreground"))
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271 | fRespawn = false;
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272 | }
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273 | else if (!strcmp(argv[i], "--no-respawn"))
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274 | {
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275 | fRespawn = false;
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276 | }
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277 | else if (!strcmp(argv[i], "--clipboard"))
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278 | {
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279 | if (g_pService)
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280 | return vbclSyntaxOnlyOneService();
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281 | g_pService = VBClGetClipboardService();
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282 | }
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283 | else if (!strcmp(argv[i], "--display"))
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284 | {
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285 | if (g_pService)
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286 | return vbclSyntaxOnlyOneService();
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287 | g_pService = VBClGetDisplayService();
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288 | }
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289 | else if (!strcmp(argv[i], "--seamless"))
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290 | {
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291 | if (g_pService)
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292 | return vbclSyntaxOnlyOneService();
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293 | g_pService = VBClGetSeamlessService();
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294 | }
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295 | else if (!strcmp(argv[i], "--checkhostversion"))
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296 | {
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297 | if (g_pService)
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298 | return vbclSyntaxOnlyOneService();
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299 | g_pService = VBClGetHostVersionService();
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300 | }
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301 | #ifdef VBOX_WITH_DRAG_AND_DROP
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302 | else if (!strcmp(argv[i], "--draganddrop"))
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303 | {
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304 | if (g_pService)
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305 | return vbclSyntaxOnlyOneService();
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306 | g_pService = VBClGetDragAndDropService();
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307 | }
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308 | #endif /* VBOX_WITH_DRAG_AND_DROP */
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309 | else if (!strcmp(argv[i], "--check3d"))
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310 | {
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311 | if (g_pService)
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312 | return vbclSyntaxOnlyOneService();
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313 | g_pService = VBClCheck3DService();
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314 | }
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315 | else if (!strcmp(argv[i], "--vmsvga"))
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316 | {
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317 | if (g_pService)
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318 | return vbclSyntaxOnlyOneService();
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319 | g_pService = VBClDisplaySVGAService();
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320 | }
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321 | /* bird: this is just a quick hack to get something out of the LogRel statements in the code. */
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322 | else if (!strcmp(argv[i], "--init-vbgl-user"))
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323 | {
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324 | rc = VbglR3InitUser();
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325 | if (RT_FAILURE(rc))
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326 | return RTMsgErrorExitFailure("VbglR3InitUser failed: %Rrc", rc);
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327 | }
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328 | else if (!strcmp(argv[i], "--init-vbgl-full"))
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329 | {
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330 | rc = VbglR3Init();
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331 | if (RT_FAILURE(rc))
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332 | return RTMsgErrorExitFailure("VbglR3Init failed: %Rrc", rc);
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333 | }
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334 | else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help"))
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335 | {
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336 | vboxClientUsage(pcszFileName);
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337 | return RTEXITCODE_SUCCESS;
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338 | }
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339 | else if (!strcmp(argv[i], "-V") || !strcmp(argv[i], "--version"))
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340 | {
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341 | RTPrintf("%sr%s\n", RTBldCfgVersion(), RTBldCfgRevisionStr());
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342 | return RTEXITCODE_SUCCESS;
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343 | }
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344 | else
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345 | {
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346 | RTMsgError("unrecognized option `%s'", argv[i]);
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347 | RTMsgInfo("Try `%s --help' for more information", pcszFileName);
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348 | return RTEXITCODE_SYNTAX;
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349 | }
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350 | }
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351 | if (!g_pService)
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352 | {
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353 | RTMsgError("No service specified. Quitting because nothing to do!");
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354 | return RTEXITCODE_SYNTAX;
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355 | }
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356 |
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357 | rc = RTCritSectInit(&g_critSect);
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358 | if (RT_FAILURE(rc))
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359 | VBClFatalError(("Initialising critical section failed: %Rrc\n", rc));
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360 | if ((*g_pService)->getPidFilePath)
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361 | {
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362 | rc = RTPathUserHome(g_szPidFile, sizeof(g_szPidFile));
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363 | if (RT_FAILURE(rc))
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364 | VBClFatalError(("Getting home directory for PID file failed: %Rrc\n", rc));
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365 | rc = RTPathAppend(g_szPidFile, sizeof(g_szPidFile),
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366 | (*g_pService)->getPidFilePath());
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367 | if (RT_FAILURE(rc))
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368 | VBClFatalError(("Creating PID file path failed: %Rrc\n", rc));
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369 | if (fDaemonise)
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370 | rc = VbglR3Daemonize(false /* fNoChDir */, false /* fNoClose */, fRespawn, &cRespawn);
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371 | if (RT_FAILURE(rc))
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372 | VBClFatalError(("Daemonizing failed: %Rrc\n", rc));
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373 | if (g_szPidFile[0])
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374 | rc = VbglR3PidFile(g_szPidFile, &g_hPidFile);
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375 | if (rc == VERR_FILE_LOCK_VIOLATION) /* Already running. */
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376 | return RTEXITCODE_SUCCESS;
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377 | if (RT_FAILURE(rc))
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378 | VBClFatalError(("Creating PID file failed: %Rrc\n", rc));
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379 | }
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380 | /* Set signal handlers to clean up on exit. */
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381 | vboxClientSetSignalHandlers();
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382 | #ifndef VBOXCLIENT_WITHOUT_X11
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383 | /* Set an X11 error handler, so that we don't die when we get unavoidable
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384 | * errors. */
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385 | XSetErrorHandler(vboxClientXLibErrorHandler);
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386 | /* Set an X11 I/O error handler, so that we can shutdown properly on
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387 | * fatal errors. */
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388 | XSetIOErrorHandler(vboxClientXLibIOErrorHandler);
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389 | #endif
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390 | rc = (*g_pService)->init(g_pService);
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391 | if (RT_SUCCESS(rc))
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392 | {
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393 | rc = (*g_pService)->run(g_pService, fDaemonise);
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394 | if (RT_FAILURE(rc))
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395 | LogRel2(("Running service failed: %Rrc\n", rc));
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396 | }
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397 | else
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398 | {
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399 | /** @todo r=andy Should we return an appropriate exit code if the service failed to init?
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400 | * Must be tested carefully with our init scripts first. */
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401 | LogRel2(("Initializing service failed: %Rrc\n", rc));
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402 | }
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403 | VBClCleanUp(false /*fExit*/);
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404 | return RTEXITCODE_SUCCESS;
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405 | }
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406 |
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