1 | /* $Id: VUSBSniffer.cpp 69500 2017-10-28 15:14:05Z vboxsync $ */
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2 | /** @file
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3 | * Virtual USB - Sniffer facility.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2014-2017 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 |
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19 | /*********************************************************************************************************************************
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20 | * Header Files *
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21 | *********************************************************************************************************************************/
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22 | #define LOG_GROUP LOG_GROUP_DRV_VUSB
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23 | #include <VBox/log.h>
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24 | #include <iprt/file.h>
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25 | #include <iprt/path.h>
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26 | #include <iprt/mem.h>
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27 | #include <iprt/string.h>
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28 | #include <iprt/semaphore.h>
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29 | #include <iprt/time.h>
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30 |
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31 | #include "VUSBSnifferInternal.h"
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32 |
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33 |
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34 | /*********************************************************************************************************************************
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35 | * Defined Constants And Macros *
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36 | *********************************************************************************************************************************/
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37 |
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38 |
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39 | /*********************************************************************************************************************************
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40 | * Structures and Typedefs *
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41 | *********************************************************************************************************************************/
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42 |
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43 | /**
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44 | * The internal VUSB sniffer state.
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45 | */
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46 | typedef struct VUSBSNIFFERINT
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47 | {
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48 | /** The file handle to dump to. */
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49 | RTFILE hFile;
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50 | /** Fast Mutex protecting the state against concurrent access. */
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51 | RTSEMFASTMUTEX hMtx;
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52 | /** File stream. */
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53 | VUSBSNIFFERSTRM Strm;
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54 | /** Pointer to the used format. */
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55 | PCVUSBSNIFFERFMT pFmt;
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56 | /** Format specific state - variable in size. */
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57 | uint8_t abFmt[1];
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58 | } VUSBSNIFFERINT;
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59 | /** Pointer to the internal VUSB sniffer state. */
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60 | typedef VUSBSNIFFERINT *PVUSBSNIFFERINT;
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61 |
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62 |
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63 | /*********************************************************************************************************************************
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64 | * Static Variables *
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65 | *********************************************************************************************************************************/
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66 |
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67 | static PCVUSBSNIFFERFMT s_aVUsbSnifferFmts[] =
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68 | {
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69 | &g_VUsbSnifferFmtPcapNg,
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70 | &g_VUsbSnifferFmtUsbMon,
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71 | &g_VUsbSnifferFmtVmx,
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72 | };
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73 |
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74 |
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75 | /*********************************************************************************************************************************
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76 | * Internal Functions *
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77 | *********************************************************************************************************************************/
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78 |
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79 | /** @interface_method_impl{VUSBSNIFFERSTRM,pfnWrite} */
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80 | static DECLCALLBACK(int) vusbSnifferStrmWrite(PVUSBSNIFFERSTRM pStrm, const void *pvBuf, size_t cbBuf)
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81 | {
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82 | PVUSBSNIFFERINT pThis = RT_FROM_MEMBER(pStrm, VUSBSNIFFERINT, Strm);
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83 |
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84 | return RTFileWrite(pThis->hFile, pvBuf, cbBuf, NULL);
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85 | }
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86 |
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87 | /**
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88 | * Returns a supporting format writer taken from the given format name.
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89 | *
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90 | * @returns Pointer to the format structure or NULL if none was found.
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91 | * @param pszFmt The format to use.
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92 | */
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93 | static PCVUSBSNIFFERFMT vusbSnifferGetFmtFromString(const char *pszFmt)
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94 | {
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95 | for (unsigned i = 0; i < RT_ELEMENTS(s_aVUsbSnifferFmts); i++)
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96 | {
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97 | if (!RTStrICmp(pszFmt, s_aVUsbSnifferFmts[i]->szName))
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98 | return s_aVUsbSnifferFmts[i];
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99 | }
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100 |
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101 | return NULL;
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102 | }
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103 |
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104 | /**
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105 | * Returns a supporting format writer taken from the file suffix.
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106 | *
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107 | * @returns Pointer to the format structure or NULL if none was found.
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108 | * @param pszFilename The file name to take the suffix from.
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109 | */
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110 | static PCVUSBSNIFFERFMT vusbSnifferGetFmtFromFilename(const char *pszFilename)
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111 | {
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112 | const char *pszFileExt = RTPathSuffix(pszFilename);
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113 | if (!pszFileExt)
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114 | return NULL;
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115 |
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116 | pszFileExt++; /* Skip the dot. */
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117 |
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118 | for (unsigned i = 0; i < RT_ELEMENTS(s_aVUsbSnifferFmts); i++)
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119 | {
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120 | unsigned idxFileExt = 0;
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121 |
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122 | while (s_aVUsbSnifferFmts[i]->papszFileExts[idxFileExt])
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123 | {
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124 | if (!RTStrICmp(pszFileExt, s_aVUsbSnifferFmts[i]->papszFileExts[idxFileExt]))
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125 | return s_aVUsbSnifferFmts[i];
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126 |
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127 | idxFileExt++;
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128 | }
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129 | }
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130 |
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131 | return NULL;
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132 | }
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133 |
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134 |
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135 | DECLHIDDEN(int) VUSBSnifferCreate(PVUSBSNIFFER phSniffer, uint32_t fFlags,
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136 | const char *pszCaptureFilename, const char *pszFmt,
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137 | const char *pszDesc)
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138 | {
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139 | RT_NOREF(pszDesc);
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140 | int rc = VINF_SUCCESS;
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141 | PVUSBSNIFFERINT pThis = NULL;
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142 | PCVUSBSNIFFERFMT pFmt = NULL;
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143 |
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144 | if (pszFmt)
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145 | pFmt = vusbSnifferGetFmtFromString(pszFmt);
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146 | else
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147 | pFmt = vusbSnifferGetFmtFromFilename(pszCaptureFilename);
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148 |
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149 | if (!pFmt)
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150 | return VERR_NOT_FOUND;
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151 |
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152 | pThis = (PVUSBSNIFFERINT)RTMemAllocZ(RT_OFFSETOF(VUSBSNIFFERINT, abFmt[pFmt->cbFmt]));
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153 | if (pThis)
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154 | {
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155 | pThis->hFile = NIL_RTFILE;
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156 | pThis->hMtx = NIL_RTSEMFASTMUTEX;
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157 | pThis->pFmt = pFmt;
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158 | pThis->Strm.pfnWrite = vusbSnifferStrmWrite;
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159 |
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160 | rc = RTSemFastMutexCreate(&pThis->hMtx);
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161 | if (RT_SUCCESS(rc))
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162 | {
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163 | uint32_t fFileFlags = RTFILE_O_DENY_NONE | RTFILE_O_WRITE | RTFILE_O_READ;
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164 | if (fFlags & VUSBSNIFFER_F_NO_REPLACE)
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165 | fFileFlags |= RTFILE_O_CREATE;
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166 | else
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167 | fFileFlags |= RTFILE_O_CREATE_REPLACE;
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168 |
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169 | rc = RTFileOpen(&pThis->hFile, pszCaptureFilename, fFileFlags);
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170 | if (RT_SUCCESS(rc))
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171 | {
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172 | rc = pThis->pFmt->pfnInit((PVUSBSNIFFERFMTINT)&pThis->abFmt[0], &pThis->Strm);
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173 | if (RT_SUCCESS(rc))
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174 | {
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175 | *phSniffer = pThis;
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176 | return VINF_SUCCESS;
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177 | }
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178 |
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179 | RTFileClose(pThis->hFile);
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180 | pThis->hFile = NIL_RTFILE;
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181 | RTFileDelete(pszCaptureFilename);
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182 | }
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183 | RTSemFastMutexDestroy(pThis->hMtx);
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184 | pThis->hMtx = NIL_RTSEMFASTMUTEX;
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185 | }
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186 |
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187 | RTMemFree(pThis);
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188 | }
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189 | else
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190 | rc = VERR_NO_MEMORY;
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191 |
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192 | return rc;
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193 | }
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194 |
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195 | /**
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196 | * Destroys the given VUSB sniffer instance.
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197 | *
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198 | * @returns nothing.
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199 | * @param hSniffer The sniffer instance to destroy.
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200 | */
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201 | DECLHIDDEN(void) VUSBSnifferDestroy(VUSBSNIFFER hSniffer)
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202 | {
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203 | PVUSBSNIFFERINT pThis = hSniffer;
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204 |
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205 | int rc = RTSemFastMutexRequest(pThis->hMtx);
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206 | AssertRC(rc);
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207 |
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208 | pThis->pFmt->pfnDestroy((PVUSBSNIFFERFMTINT)&pThis->abFmt[0]);
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209 |
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210 | if (pThis->hFile != NIL_RTFILE)
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211 | RTFileClose(pThis->hFile);
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212 |
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213 | RTSemFastMutexRelease(pThis->hMtx);
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214 | RTSemFastMutexDestroy(pThis->hMtx);
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215 | RTMemFree(pThis);
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216 | }
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217 |
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218 | /**
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219 | * Records an VUSB event.
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220 | *
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221 | * @returns VBox status code.
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222 | * @param hSniffer The sniffer instance.
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223 | * @param pUrb The URB triggering the event.
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224 | * @param enmEvent The type of event to record.
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225 | */
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226 | DECLHIDDEN(int) VUSBSnifferRecordEvent(VUSBSNIFFER hSniffer, PVUSBURB pUrb, VUSBSNIFFEREVENT enmEvent)
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227 | {
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228 | int rc = VINF_SUCCESS;
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229 | PVUSBSNIFFERINT pThis = hSniffer;
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230 |
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231 | /* Write the packet to the capture file. */
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232 | rc = RTSemFastMutexRequest(pThis->hMtx);
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233 | if (RT_SUCCESS(rc))
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234 | {
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235 | rc = pThis->pFmt->pfnRecordEvent((PVUSBSNIFFERFMTINT)&pThis->abFmt[0], pUrb, enmEvent);
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236 | RTSemFastMutexRelease(pThis->hMtx);
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237 | }
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238 |
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239 | return rc;
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240 | }
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241 |
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