1 | /** @file
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2 | *
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3 | * VirtualBox API client token holder (in the client process)
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2013 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 <iprt/asm.h>
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19 | #include <iprt/assert.h>
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20 | #include <iprt/log.h>
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21 | #include <iprt/semaphore.h>
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22 | #include <iprt/process.h>
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23 |
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24 | #ifdef VBOX_WITH_SYS_V_IPC_SESSION_WATCHER
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25 | # include <errno.h>
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26 | # include <sys/types.h>
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27 | # include <sys/stat.h>
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28 | # include <sys/ipc.h>
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29 | # include <sys/sem.h>
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30 | #endif
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31 |
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32 | #include <VBox/com/defs.h>
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33 |
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34 | #include "ClientTokenHolder.h"
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35 | #include "SessionImpl.h"
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36 |
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37 |
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38 | #if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
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39 | /** client token holder thread */
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40 | static DECLCALLBACK(int) ClientTokenHolderThread(RTTHREAD Thread, void *pvUser);
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41 | #endif
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42 |
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43 |
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44 | Session::ClientTokenHolder::ClientTokenHolder()
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45 | {
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46 | AssertReleaseFailed();
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47 | }
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48 |
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49 | Session::ClientTokenHolder::~ClientTokenHolder()
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50 | {
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51 | /* release the client token */
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52 | #if defined(RT_OS_WINDOWS)
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53 |
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54 | if (mSem && mThreadSem)
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55 | {
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56 | /*
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57 | * tell the thread holding the token to release it;
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58 | * it will close mSem handle
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59 | */
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60 | ::SetEvent(mSem);
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61 | /* wait for the thread to finish */
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62 | ::WaitForSingleObject(mThreadSem, INFINITE);
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63 | ::CloseHandle(mThreadSem);
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64 |
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65 | mThreadSem = NULL;
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66 | mSem = NULL;
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67 | mThread = NIL_RTTHREAD;
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68 | }
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69 |
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70 | #elif defined(RT_OS_OS2)
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71 |
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72 | if (mThread != NIL_RTTHREAD)
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73 | {
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74 | Assert(mSem != NIL_RTSEMEVENT);
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75 |
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76 | /* tell the thread holding the token to release it */
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77 | int vrc = RTSemEventSignal(mSem);
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78 | AssertRC(vrc == NO_ERROR);
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79 |
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80 | /* wait for the thread to finish */
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81 | vrc = RTThreadUserWait(mThread, RT_INDEFINITE_WAIT);
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82 | Assert(RT_SUCCESS(vrc) || vrc == VERR_INTERRUPTED);
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83 |
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84 | mThread = NIL_RTTHREAD;
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85 | }
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86 |
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87 | if (mSem != NIL_RTSEMEVENT)
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88 | {
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89 | RTSemEventDestroy(mSem);
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90 | mSem = NIL_RTSEMEVENT;
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91 | }
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92 |
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93 | #elif defined(VBOX_WITH_SYS_V_IPC_SESSION_WATCHER)
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94 |
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95 | if (mSem >= 0)
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96 | {
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97 | ::sembuf sop = { 0, 1, SEM_UNDO };
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98 | ::semop(mSem, &sop, 1);
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99 |
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100 | mSem = -1;
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101 | }
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102 |
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103 | #else
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104 | # error "Port me!"
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105 | #endif
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106 | }
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107 |
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108 | Session::ClientTokenHolder::ClientTokenHolder(const Utf8Str &strTokenId) :
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109 | mClientTokenId(strTokenId)
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110 | {
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111 | mSem = CTHSEMARG;
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112 | mThread = NIL_RTTHREAD;
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113 |
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114 | #if defined(RT_OS_WINDOWS)
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115 | mThreadSem = CTHTHREADSEMARG;
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116 |
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117 | Bstr bstrTokenId(strTokenId);
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118 |
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119 | /*
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120 | * Since there is no guarantee that the constructor and destructor will be
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121 | * called in the same thread, we need a separate thread to hold the token.
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122 | */
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123 |
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124 | mThreadSem = ::CreateEvent(NULL, FALSE, FALSE, NULL);
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125 | AssertMsgReturnVoid(mThreadSem,
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126 | ("Cannot create an event sem, err=%d", ::GetLastError()));
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127 |
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128 | void *data[3];
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129 | data[0] = (void*)(BSTR)bstrTokenId.raw();
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130 | data[1] = (void*)mThreadSem;
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131 | data[2] = 0; /* will get an output from the thread */
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132 |
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133 | /* create a thread to hold the token until signalled to release it */
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134 | int vrc = RTThreadCreate(&mThread, ClientTokenHolderThread, (void*)data, 0, RTTHREADTYPE_MAIN_WORKER, 0, "IPCHolder");
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135 | AssertRCReturnVoid(vrc);
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136 |
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137 | /* wait until thread init is completed */
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138 | DWORD wrc = ::WaitForSingleObject(mThreadSem, INFINITE);
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139 | AssertMsg(wrc == WAIT_OBJECT_0, ("Wait failed, err=%d\n", ::GetLastError()));
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140 | Assert(data[2]);
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141 |
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142 | if (wrc == WAIT_OBJECT_0 && data[2])
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143 | {
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144 | /* memorize the event sem we should signal in close() */
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145 | mSem = (HANDLE)data[2];
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146 | }
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147 | else
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148 | {
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149 | ::CloseHandle(mThreadSem);
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150 | mThreadSem = NULL;
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151 | }
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152 | #elif defined(RT_OS_OS2)
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153 | Bstr bstrTokenId(strTokenId);
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154 |
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155 | /*
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156 | * Since there is no guarantee that the constructor and destructor will be
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157 | * called in the same thread, we need a separate thread to hold the token.
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158 | */
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159 |
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160 | int vrc = RTSemEventCreate(&mSem);
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161 | AssertRCReturnVoid(vrc);
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162 |
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163 | void *data[3];
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164 | data[0] = (void*)bstrTokenId.raw();
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165 | data[1] = (void*)mSem;
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166 | data[2] = (void*)false; /* will get the thread result here */
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167 |
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168 | /* create a thread to hold the token until signalled to release it */
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169 | vrc = RTThreadCreate(&mThread, ClientTokenHolderThread, (void *) data,
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170 | 0, RTTHREADTYPE_MAIN_WORKER, 0, "IPCHolder");
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171 | AssertRCReturnVoid(vrc);
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172 | /* wait until thread init is completed */
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173 | vrc = RTThreadUserWait(mThread, RT_INDEFINITE_WAIT);
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174 | AssertReturnVoid(RT_SUCCESS(vrc) || vrc == VERR_INTERRUPTED);
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175 |
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176 | /* the thread must succeed */
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177 | AssertReturnVoid((bool)data[2]);
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178 |
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179 | #elif defined(VBOX_WITH_SYS_V_IPC_SESSION_WATCHER)
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180 |
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181 | # ifdef VBOX_WITH_NEW_SYS_V_KEYGEN
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182 | key_t key = RTStrToUInt32(strTokenId.c_str());
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183 | AssertMsgReturnVoid(key != 0,
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184 | ("Key value of 0 is not valid for client token"));
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185 | # else /* !VBOX_WITH_NEW_SYS_V_KEYGEN */
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186 | char *pszSemName = NULL;
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187 | RTStrUtf8ToCurrentCP(&pszSemName, strTokenId);
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188 | key_t key = ::ftok(pszSemName, 'V');
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189 | RTStrFree(pszSemName);
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190 | # endif /* !VBOX_WITH_NEW_SYS_V_KEYGEN */
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191 | int s = ::semget(key, 0, 0);
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192 | AssertMsgReturnVoid(s >= 0,
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193 | ("Cannot open semaphore, errno=%d", errno));
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194 |
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195 | /* grab the semaphore */
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196 | ::sembuf sop = { 0, -1, SEM_UNDO };
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197 | int rv = ::semop(s, &sop, 1);
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198 | AssertMsgReturnVoid(rv == 0,
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199 | ("Cannot grab semaphore, errno=%d", errno));
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200 | mSem = s;
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201 |
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202 | #else
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203 | # error "Port me!"
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204 | #endif
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205 | }
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206 |
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207 | bool Session::ClientTokenHolder::isReady()
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208 | {
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209 | return mSem != CTHSEMARG;
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210 | }
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211 |
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212 | #if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
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213 | /** client token holder thread */
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214 | DECLCALLBACK(int) ClientTokenHolderThread(RTTHREAD Thread, void *pvUser)
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215 | {
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216 | LogFlowFuncEnter();
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217 |
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218 | Assert(pvUser);
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219 |
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220 | void **data = (void **)pvUser;
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221 |
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222 | # if defined(RT_OS_WINDOWS)
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223 | BSTR sessionId = (BSTR)data[0];
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224 | HANDLE initDoneSem = (HANDLE)data[1];
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225 |
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226 | HANDLE mutex = ::OpenMutex(MUTEX_ALL_ACCESS, FALSE, sessionId);
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227 | AssertMsg(mutex, ("cannot open token, err=%d\n", ::GetLastError()));
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228 |
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229 | if (mutex)
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230 | {
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231 | /* grab the token */
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232 | DWORD wrc = ::WaitForSingleObject(mutex, 0);
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233 | AssertMsg(wrc == WAIT_OBJECT_0, ("cannot grab token, err=%d\n", wrc));
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234 | if (wrc == WAIT_OBJECT_0)
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235 | {
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236 | HANDLE finishSem = ::CreateEvent(NULL, FALSE, FALSE, NULL);
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237 | AssertMsg(finishSem, ("cannot create event sem, err=%d\n", ::GetLastError()));
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238 | if (finishSem)
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239 | {
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240 | data[2] = (void*)finishSem;
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241 | /* signal we're done with init */
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242 | ::SetEvent(initDoneSem);
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243 | /* wait until we're signaled to release the token */
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244 | ::WaitForSingleObject(finishSem, INFINITE);
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245 | /* release the token */
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246 | LogFlow(("ClientTokenHolderThread(): releasing token...\n"));
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247 | BOOL success = ::ReleaseMutex(mutex);
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248 | AssertMsg(success, ("cannot release token, err=%d\n", ::GetLastError()));
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249 | ::CloseHandle(mutex);
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250 | ::CloseHandle(finishSem);
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251 | }
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252 | }
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253 | }
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254 |
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255 | /* signal we're done */
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256 | ::SetEvent(initDoneSem);
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257 | # elif defined(RT_OS_OS2)
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258 | Utf8Str sessionId = (BSTR)data[0];
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259 | RTSEMEVENT finishSem = (RTSEMEVENT)data[1];
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260 |
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261 | LogFlowFunc(("sessionId='%s', finishSem=%p\n", sessionId.raw(), finishSem));
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262 |
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263 | HMTX mutex = NULLHANDLE;
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264 | APIRET arc = ::DosOpenMutexSem((PSZ)sessionId.raw(), &mutex);
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265 | AssertMsg(arc == NO_ERROR, ("cannot open token, arc=%ld\n", arc));
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266 |
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267 | if (arc == NO_ERROR)
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268 | {
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269 | /* grab the token */
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270 | LogFlowFunc(("grabbing token...\n"));
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271 | arc = ::DosRequestMutexSem(mutex, SEM_IMMEDIATE_RETURN);
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272 | AssertMsg(arc == NO_ERROR, ("cannot grab token, arc=%ld\n", arc));
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273 | if (arc == NO_ERROR)
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274 | {
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275 | /* store the answer */
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276 | data[2] = (void*)true;
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277 | /* signal we're done */
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278 | int vrc = RTThreadUserSignal(Thread);
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279 | AssertRC(vrc);
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280 |
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281 | /* wait until we're signaled to release the token */
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282 | LogFlowFunc(("waiting for termination signal..\n"));
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283 | vrc = RTSemEventWait(finishSem, RT_INDEFINITE_WAIT);
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284 | Assert(arc == ERROR_INTERRUPT || ERROR_TIMEOUT);
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285 |
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286 | /* release the token */
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287 | LogFlowFunc(("releasing token...\n"));
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288 | arc = ::DosReleaseMutexSem(mutex);
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289 | AssertMsg(arc == NO_ERROR, ("cannot release token, arc=%ld\n", arc));
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290 | }
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291 | ::DosCloseMutexSem(mutex);
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292 | }
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293 |
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294 | /* store the answer */
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295 | data[1] = (void*)false;
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296 | /* signal we're done */
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297 | int vrc = RTThreadUserSignal(Thread);
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298 | AssertRC(vrc);
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299 | # else
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300 | # error "Port me!"
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301 | # endif
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302 |
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303 | LogFlowFuncLeave();
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304 |
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305 | return 0;
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306 | }
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307 | #endif
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308 |
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309 | /* vi: set tabstop=4 shiftwidth=4 expandtab: */
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