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annotate dep/animia/src/fd/win32.cc @ 201:8f6f8dd2eb23

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dep/animia: finish kvm backend dep/animia: cmake: don't use kvm on unsupported systems, use private and public includes properly cmake: why are we defining target include directories twice?
author paper@DavesDouble.local
date Sun, 19 Nov 2023 19:13:28 -0500
parents e44b7c428d7c
children c413e475f496
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1 #include "animia/fd/win32.h"
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2 #include "animia/util/win32.h"
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3 #include "animia.h"
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4
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5 #include <stdexcept>
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6 #include <string>
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7 #include <unordered_map>
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8 #include <vector>
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9
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10 #include <fileapi.h>
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11 #include <handleapi.h>
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12 #include <libloaderapi.h>
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13 #include <ntdef.h>
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14 #include <psapi.h>
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15 #include <shlobj.h>
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16 #include <stringapiset.h>
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17 #include <tlhelp32.h>
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18 #include <windows.h>
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19 #include <winternl.h>
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20
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21 /* This file is noticably more complex than Unix and Linux, and that's because
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22 * there is no "simple" way to get the paths of a file. In fact, this thing requires
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23 * you to use *internal functions* that can't even be linked to, hence why we have to
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24 * use GetProcAddress and such. What a mess.
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25 *
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26 * Speaking of which, because this file uses internal functions of the OS, it is not
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27 * guaranteed to work far into the future. However, it has worked since NT 6.0 (Vista)
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28 * at least, so it's unlikely to be changed much ever.
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29 */
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30
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31 /* SystemExtendedHandleInformation is only available in NT 5.1+ (XP and higher) and provides information for
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32 * 32-bit PIDs, unlike SystemHandleInformation
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33 */
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34 constexpr SYSTEM_INFORMATION_CLASS SystemExtendedHandleInformation = static_cast<SYSTEM_INFORMATION_CLASS>(0x40);
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35
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36 /* more constants not in winternl.h */
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37 constexpr NTSTATUS STATUS_INFO_LENGTH_MISMATCH = 0xC0000004UL;
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38
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39 /* this is filled in at runtime because it's not guaranteed to be (and isn't)
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40 constant between different versions of Windows */
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41 static unsigned short file_type_index = 0;
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42
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43 struct SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX {
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44 PVOID Object;
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45 ULONG_PTR UniqueProcessId;
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46 HANDLE HandleValue;
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47 ACCESS_MASK GrantedAccess;
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48 USHORT CreatorBackTraceIndex;
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49 USHORT ObjectTypeIndex;
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50 ULONG HandleAttributes;
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51 ULONG Reserved;
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52 };
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53
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54 struct SYSTEM_HANDLE_INFORMATION_EX {
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55 ULONG_PTR NumberOfHandles;
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56 ULONG_PTR Reserved;
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57 SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX Handles[1];
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58 };
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59
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60 namespace animia::internal::win32 {
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61
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62 static HANDLE DuplicateHandle(HANDLE process_handle, HANDLE handle) {
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63 HANDLE dup_handle = nullptr;
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64 const bool result =
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65 ::DuplicateHandle(process_handle, handle, ::GetCurrentProcess(), &dup_handle, 0, false, DUPLICATE_SAME_ACCESS);
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66 return result ? dup_handle : nullptr;
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67 }
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68
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69 static PVOID GetNTDLLAddress(LPCSTR proc_name) {
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70 return reinterpret_cast<PVOID>(::GetProcAddress(::GetModuleHandleA("ntdll.dll"), proc_name));
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71 }
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72
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73 static NTSTATUS QuerySystemInformation(SYSTEM_INFORMATION_CLASS cls, PVOID sysinfo, ULONG len, PULONG retlen) {
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74 static const auto func =
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75 reinterpret_cast<decltype(::NtQuerySystemInformation)*>(GetNTDLLAddress("NtQuerySystemInformation"));
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76 return func(cls, sysinfo, len, retlen);
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77 }
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78
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79 static NTSTATUS QueryObject(HANDLE handle, OBJECT_INFORMATION_CLASS cls, PVOID objinf, ULONG objinflen, PULONG retlen) {
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80 static const auto func = reinterpret_cast<decltype(::NtQueryObject)*>(GetNTDLLAddress("NtQueryObject"));
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81 return func(handle, cls, objinf, objinflen, retlen);
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82 }
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83
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84 static std::vector<SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX> GetSystemHandleInformation() {
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85 std::vector<SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX> res;
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86 /* we should really put a cap on this */
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87 ULONG cb = 1 << 19;
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88
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89 for (NTSTATUS status = STATUS_INFO_LENGTH_MISMATCH; status == STATUS_INFO_LENGTH_MISMATCH;) {
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90 /* why are we doing this? */
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91 status = STATUS_NO_MEMORY;
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92
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93 SYSTEM_HANDLE_INFORMATION_EX* info = (SYSTEM_HANDLE_INFORMATION_EX*)malloc(cb *= 2);
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94 if (!info)
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95 continue;
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96
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97 res.reserve(cb);
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98
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99 status = QuerySystemInformation(SystemExtendedHandleInformation, info, cb, &cb);
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100 if (0 <= status) {
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101 ULONG_PTR handles = info->NumberOfHandles;
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102 if (handles) {
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103 res.reserve(res.size() + handles);
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104
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105 SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX* entry = info->Handles;
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106 do {
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107 if (entry)
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108 res.push_back(*entry);
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109 } while (entry++, --handles);
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110 }
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111 }
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112
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113 free(info);
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114 }
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115
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116 return res;
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117 }
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118
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119 static OBJECT_TYPE_INFORMATION QueryObjectTypeInfo(HANDLE handle) {
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120 OBJECT_TYPE_INFORMATION info;
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121 QueryObject(handle, ObjectTypeInformation, &info, sizeof(info), NULL);
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122 return info;
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123 }
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124
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125 static std::string GetHandleType(HANDLE handle) {
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126 OBJECT_TYPE_INFORMATION info = QueryObjectTypeInfo(handle);
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127 return ToUtf8String(info.TypeName);
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128 }
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129
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130 static std::string GetFinalPathNameByHandle(HANDLE handle) {
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131 std::wstring buffer;
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132
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133 int result = ::GetFinalPathNameByHandleW(handle, NULL, 0, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
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134 buffer.resize(result);
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135 ::GetFinalPathNameByHandleW(handle, &buffer.front(), buffer.size(), FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
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136 buffer.resize(buffer.find('\0'));
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137
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138 return ToUtf8String(buffer);
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139 }
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140
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141 static bool IsFileHandle(HANDLE handle, unsigned short object_type_index) {
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142 if (file_type_index)
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143 return object_type_index == file_type_index;
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144 else if (!handle)
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145 return true;
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146 else if (GetHandleType(handle) == "File") {
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147 file_type_index = object_type_index;
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148 return true;
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149 }
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150 return false;
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151 }
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152
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153 static bool IsFileMaskOk(ACCESS_MASK access_mask) {
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154 if (!(access_mask & FILE_READ_DATA))
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155 return false;
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156
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157 if ((access_mask & FILE_APPEND_DATA) || (access_mask & FILE_WRITE_EA) || (access_mask & FILE_WRITE_ATTRIBUTES))
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158 return false;
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159
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160 return true;
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161 }
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162
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163 static bool IsFilePathOk(const std::string& path) {
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164 if (path.empty())
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165 return false;
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166
152
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167 if (IsSystemDirectory(path))
138
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168 return false;
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169
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170 const auto file_attributes = GetFileAttributesA(path.c_str());
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171 if ((file_attributes == INVALID_FILE_ATTRIBUTES) || (file_attributes & FILE_ATTRIBUTE_DIRECTORY))
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172 return false;
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173
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174 return true;
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175 }
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176
152
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diff changeset
177 bool Win32FdTools::EnumerateOpenProcesses(process_proc_t process_proc) {
138
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178 HANDLE hProcessSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
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179 if (hProcessSnap == INVALID_HANDLE_VALUE)
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180 return false;
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181
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182 PROCESSENTRY32 pe32;
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183 pe32.dwSize = sizeof(PROCESSENTRY32);
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184
28842a8d0c6b dep/animia: huge refactor (again...)
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185 if (!::Process32First(hProcessSnap, &pe32))
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186 return false;
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187
152
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diff changeset
188 if (!process_proc({pe32.th32ProcessID, pe32.szExeFile}))
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diff changeset
189 return false;
138
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190
28842a8d0c6b dep/animia: huge refactor (again...)
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191 while (::Process32Next(hProcessSnap, &pe32))
152
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diff changeset
192 if (!process_proc({pe32.th32ProcessID, pe32.szExeFile}))
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diff changeset
193 return false;
138
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194
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195 ::CloseHandle(hProcessSnap);
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196
28842a8d0c6b dep/animia: huge refactor (again...)
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197 return true;
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198 }
28842a8d0c6b dep/animia: huge refactor (again...)
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199
152
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diff changeset
200 /* this could be changed to being a callback, but... I'm too lazy right now :) */
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diff changeset
201 bool Win32FdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
8700806c2cc2 dep/animia: awesome new breaking changes!
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202 if (!open_file_proc)
138
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203 return false;
28842a8d0c6b dep/animia: huge refactor (again...)
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204
28842a8d0c6b dep/animia: huge refactor (again...)
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205 std::unordered_map<pid_t, Handle> proc_handles;
28842a8d0c6b dep/animia: huge refactor (again...)
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206
28842a8d0c6b dep/animia: huge refactor (again...)
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207 for (const pid_t& pid : pids) {
28842a8d0c6b dep/animia: huge refactor (again...)
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208 const HANDLE handle = ::OpenProcess(PROCESS_DUP_HANDLE, false, pid);
150
ffa535b6d630 *: avoid usage of std::[pair,tuple]
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diff changeset
209 if (handle != INVALID_HANDLE_VALUE)
138
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210 proc_handles[pid] = Handle(handle);
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211 }
28842a8d0c6b dep/animia: huge refactor (again...)
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212
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213 if (proc_handles.empty())
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214 return false;
28842a8d0c6b dep/animia: huge refactor (again...)
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215
28842a8d0c6b dep/animia: huge refactor (again...)
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216 std::vector<SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX> info = GetSystemHandleInformation();
28842a8d0c6b dep/animia: huge refactor (again...)
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217
28842a8d0c6b dep/animia: huge refactor (again...)
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218 for (const auto& h : info) {
28842a8d0c6b dep/animia: huge refactor (again...)
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219 const pid_t pid = h.UniqueProcessId;
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220 if (!pids.count(pid))
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221 continue;
28842a8d0c6b dep/animia: huge refactor (again...)
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222
28842a8d0c6b dep/animia: huge refactor (again...)
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223 if (!IsFileHandle(nullptr, h.ObjectTypeIndex))
28842a8d0c6b dep/animia: huge refactor (again...)
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diff changeset
224 continue;
28842a8d0c6b dep/animia: huge refactor (again...)
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225
28842a8d0c6b dep/animia: huge refactor (again...)
Paper <mrpapersonic@gmail.com>
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diff changeset
226 if (!IsFileMaskOk(h.GrantedAccess))
28842a8d0c6b dep/animia: huge refactor (again...)
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diff changeset
227 continue;
28842a8d0c6b dep/animia: huge refactor (again...)
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228
28842a8d0c6b dep/animia: huge refactor (again...)
Paper <mrpapersonic@gmail.com>
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229 Handle handle(DuplicateHandle(proc_handles[pid].get(), h.HandleValue));
150
ffa535b6d630 *: avoid usage of std::[pair,tuple]
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diff changeset
230 if (handle.get() == INVALID_HANDLE_VALUE)
138
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231 continue;
28842a8d0c6b dep/animia: huge refactor (again...)
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diff changeset
232
28842a8d0c6b dep/animia: huge refactor (again...)
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233 if (GetFileType(handle.get()) != FILE_TYPE_DISK)
28842a8d0c6b dep/animia: huge refactor (again...)
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234 continue;
28842a8d0c6b dep/animia: huge refactor (again...)
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235
28842a8d0c6b dep/animia: huge refactor (again...)
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236 const std::string path = GetFinalPathNameByHandle(handle.get());
28842a8d0c6b dep/animia: huge refactor (again...)
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diff changeset
237 if (!IsFilePathOk(path))
28842a8d0c6b dep/animia: huge refactor (again...)
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238 continue;
28842a8d0c6b dep/animia: huge refactor (again...)
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diff changeset
239
152
8700806c2cc2 dep/animia: awesome new breaking changes!
Paper <mrpapersonic@gmail.com>
parents: 151
diff changeset
240 if (!open_file_proc({pid, path}))
8700806c2cc2 dep/animia: awesome new breaking changes!
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parents: 151
diff changeset
241 return false;
138
28842a8d0c6b dep/animia: huge refactor (again...)
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parents:
diff changeset
242 }
28842a8d0c6b dep/animia: huge refactor (again...)
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parents:
diff changeset
243
28842a8d0c6b dep/animia: huge refactor (again...)
Paper <mrpapersonic@gmail.com>
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244 return true;
28842a8d0c6b dep/animia: huge refactor (again...)
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parents:
diff changeset
245 }
28842a8d0c6b dep/animia: huge refactor (again...)
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246
28842a8d0c6b dep/animia: huge refactor (again...)
Paper <mrpapersonic@gmail.com>
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247 } // namespace animia::internal::win32