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annotate dep/animone/src/fd/win32.cc @ 342:adb79bdde329

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dep/animone: fix tons of issues for example, the window ID stuff was just... completely wrong. since we're supporting multiple different window systems, it *has* to be a union rather than just a single integer type. HWND is also not a DWORD, it's a pointer(!), so now it's stored as a std::uintptr_t. (this probably breaks things)
author Paper <paper@paper.us.eu.org>
date Thu, 20 Jun 2024 03:03:05 -0400
parents 74e2365326c6
children 1faa72660932
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a4257370de16 dep/animone: prepare for v1.0 release; it should be ready by now
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1 /*
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2 * fd/win32.cc: support for windows
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3 *
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4 * this file is noticably more complex than *nix, and that's because
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5 * there is no "simple" way to get the paths of a file. In fact, this thing requires
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6 * you to use *internal functions* that can't even be linked to, hence why we have to
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7 * use GetProcAddress and such. what a mess.
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8 *
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9 * Speaking of which, because this file uses internal functions of the OS, it is not
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10 * even guaranteed to work far into the future. however, just like with macOS, these
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11 * things have stayed the same since Vista so if Microsoft *really* wants compatibility
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12 * then they're pretty much forced to keeping this the same anyway.
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13 */
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14 #include "animone/fd/win32.h"
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15 #include "animone/util.h"
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16 #include "animone.h"
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17 #include "animone/util/win32.h"
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18
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19 #include <stdexcept>
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20 #include <string>
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21 #include <unordered_map>
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22 #include <vector>
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23 #include <optional>
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24
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25 #include <fileapi.h>
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26 #include <handleapi.h>
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27 #include <libloaderapi.h>
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28 #include <ntdef.h>
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29 #include <psapi.h>
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30 #include <shlobj.h>
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31 #include <stringapiset.h>
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32 #include <tlhelp32.h>
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33 #include <windows.h>
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34 #include <winternl.h>
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35
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36 /* SystemExtendedHandleInformation is only available in NT 5.1+ (XP and higher) and provides information for
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37 * 32-bit PIDs, unlike SystemHandleInformation */
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38 static constexpr SYSTEM_INFORMATION_CLASS SystemExtendedHandleInformation = static_cast<SYSTEM_INFORMATION_CLASS>(0x40);
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39 static constexpr NTSTATUS STATUS_INFO_LENGTH_MISMATCH = 0xC0000004UL;
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40
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41 struct SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX {
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42 PVOID Object;
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43 ULONG_PTR UniqueProcessId;
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44 HANDLE HandleValue;
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45 ACCESS_MASK GrantedAccess;
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46 USHORT CreatorBackTraceIndex;
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47 USHORT ObjectTypeIndex;
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48 ULONG HandleAttributes;
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49 ULONG Reserved;
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50 };
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51
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52 struct SYSTEM_HANDLE_INFORMATION_EX {
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53 ULONG_PTR NumberOfHandles;
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54 ULONG_PTR Reserved;
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55 SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX Handles[1];
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56 };
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57
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58 namespace animone::internal::win32 {
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59
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60 class Ntdll {
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61 public:
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62 Ntdll() {
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63 ntdll = ::GetModuleHandleW(L"ntdll.dll");
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64 nt_query_system_information = reinterpret_cast<decltype(::NtQuerySystemInformation)*>(
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65 ::GetProcAddress(ntdll, "NtQuerySystemInformation"));
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66 nt_query_object = reinterpret_cast<decltype(::NtQueryObject)*>(::GetProcAddress(ntdll, "NtQueryObject"));
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67 }
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68
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69 NTSTATUS QuerySystemInformation(SYSTEM_INFORMATION_CLASS cls, PVOID sysinfo, ULONG len,
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70 PULONG retlen){
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71 return nt_query_system_information(cls, sysinfo, len, retlen);
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72 }
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73
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74 NTSTATUS QueryObject(HANDLE handle, OBJECT_INFORMATION_CLASS cls, PVOID objinf, ULONG objinflen, PULONG retlen) {
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75 return nt_query_object(handle, cls, objinf, objinflen, retlen);
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76 }
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77
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78 private:
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79 HMODULE ntdll;
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80 decltype(::NtQuerySystemInformation)* nt_query_system_information;
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81 decltype(::NtQueryObject)* nt_query_object;
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82 };
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83
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84 Ntdll ntdll;
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85
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86 static HANDLE DuplicateHandle(HANDLE process_handle, HANDLE handle) {
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87 HANDLE dup_handle = nullptr;
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88 const bool result =
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89 ::DuplicateHandle(process_handle, handle, ::GetCurrentProcess(), &dup_handle, 0, false, DUPLICATE_SAME_ACCESS);
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90 return result ? dup_handle : nullptr;
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91 }
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92
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93 static std::vector<SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX> GetSystemHandleInformation() {
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94 /* we should really put a cap on this */
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95 ULONG cb = 1 << 19;
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96 NTSTATUS status = STATUS_NO_MEMORY;
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97 std::unique_ptr<SYSTEM_HANDLE_INFORMATION_EX> info;
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98
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99 do {
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100 info.reset(reinterpret_cast<SYSTEM_HANDLE_INFORMATION_EX*>(malloc(cb *= 2)));
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101 if (!info)
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102 continue;
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103
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104 status = ntdll.QuerySystemInformation(SystemExtendedHandleInformation, info.get(), cb, &cb);
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105 } while (status == STATUS_INFO_LENGTH_MISMATCH);
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106
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107 if (!NT_SUCCESS(status))
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108 return {};
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109
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110 std::vector<SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX> res;
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111
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112 ULONG_PTR handles = info->NumberOfHandles;
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113 if (!handles)
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114 return {};
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115
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116 res.reserve(handles);
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117
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118 SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX* entry = info->Handles;
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119 do {
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120 if (entry)
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121 res.push_back(*(entry++));
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122 } while (--handles);
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123
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124 return res;
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125 }
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126
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127 static std::wstring GetHandleType(HANDLE handle) {
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128 OBJECT_TYPE_INFORMATION info = {0};
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129 ntdll.QueryObject(handle, ObjectTypeInformation, &info, sizeof(info), NULL);
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130 return std::wstring(info.TypeName.Buffer, info.TypeName.Length);
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131 }
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132
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133 static std::wstring GetFinalPathNameByHandle(HANDLE handle) {
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134 std::wstring buffer;
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135
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136 DWORD size = ::GetFinalPathNameByHandleW(handle, nullptr, 0, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
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137 buffer.resize(size);
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138 ::GetFinalPathNameByHandleW(handle, &buffer.front(), buffer.size(), FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
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139
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140 return buffer;
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141 }
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142
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143 /* ------------------------------------------------------------------- */
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144
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145 static bool GetSystemDirectory(std::wstring& str) {
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146 str.assign(MAX_PATH, '\0');
340
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147
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148 return SUCCEEDED(::SHGetFolderPathW(NULL, CSIDL_WINDOWS, NULL, SHGFP_TYPE_CURRENT, &str.front()));
340
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149 }
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150
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151 static bool IsSystemDirectory(std::wstring path) {
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152 std::wstring windir;
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153 if (!GetSystemDirectory(windir))
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154 return false;
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155
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156 ::CharUpperBuffW(&path.front(), path.length());
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157 ::CharUpperBuffW(&windir.front(), windir.length());
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158
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159 // XXX wtf is 4?
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160 return path.find(windir) == 4;
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161 }
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162
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163 static bool IsSystemDirectory(const std::string& path) {
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164 return IsSystemDirectory(ToWstring(path));
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165 }
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166
301
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167 static bool IsFileHandle(HANDLE handle, unsigned short object_type_index) {
340
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168 /* this is filled in at runtime because it's not guaranteed to be (and isn't)
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169 * constant between different versions of Windows */
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170 static std::optional<unsigned short> file_type_index;
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171
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172 if (file_type_index.has_value()) {
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173 return object_type_index == file_type_index.value();
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174 } else if (!handle) {
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175 /* XXX what? */
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176 return true;
340
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177 } else if (GetHandleType(handle) == L"File") {
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178 file_type_index = object_type_index;
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179 return true;
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180 }
340
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181
301
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182 return false;
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183 }
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184
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185 static bool IsFileMaskOk(ACCESS_MASK access_mask) {
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186 if (!(access_mask & FILE_READ_DATA))
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187 return false;
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188
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189 if ((access_mask & FILE_APPEND_DATA) || (access_mask & FILE_WRITE_EA) || (access_mask & FILE_WRITE_ATTRIBUTES))
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190 return false;
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191
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192 return true;
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193 }
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194
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195 static bool IsFilePathOk(const std::wstring& path) {
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196 if (path.empty())
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197 return false;
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198
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199 if (IsSystemDirectory(path))
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200 return false;
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201
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202 const auto file_attributes = GetFileAttributesW(path.c_str());
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203 if ((file_attributes == INVALID_FILE_ATTRIBUTES) || (file_attributes & FILE_ATTRIBUTE_DIRECTORY))
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204 return false;
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205
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206 return true;
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207 }
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208
340
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209 /* ------------------------------------------------------------------- */
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210
342
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211 static bool GetProcessPath(DWORD process_id, std::string& path) {
340
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212 // If we try to open a SYSTEM process, this function fails and the last error
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213 // code is ERROR_ACCESS_DENIED.
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214 //
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215 // Note that if we requested PROCESS_QUERY_INFORMATION access right instead
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216 // of PROCESS_QUERY_LIMITED_INFORMATION, this function would fail when used
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217 // to open an elevated process.
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218 Handle process_handle(::OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, process_id));
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219
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220 if (!process_handle)
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221 return false;
340
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222
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223 std::wstring buffer(MAX_PATH, L'\0');
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224 DWORD buf_size = buffer.length();
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225
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226 // Note that this function requires Windows Vista or above. You may use
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227 // GetProcessImageFileName or GetModuleFileNameEx on earlier versions.
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228 if (!::QueryFullProcessImageNameW(process_handle.get(), 0, &buffer.front(), &buf_size))
342
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229 return false;
340
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230
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231 buffer.resize(buf_size);
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232 path = ToUtf8String(buffer);
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233 return true;
340
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234 }
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235
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236 static std::string GetFilenameFromPath(const std::string& path) {
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237 const auto pos = path.find_last_of("/\\");
340
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238 return pos != std::wstring::npos ? path.substr(pos + 1) : path;
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239 }
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240
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241 static bool VerifyProcessPath(const std::string& path) {
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242 return !path.empty() && !IsSystemDirectory(path);
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243 }
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244
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245 static bool VerifyProcessFilename(const std::string& name) {
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246 static const std::set<std::string> invalid_names = {
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247 // System files
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248 "explorer.exe", // Windows Explorer
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249 "taskeng.exe", // Task Scheduler Engine
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250 "taskhost.exe", // Host Process for Windows Tasks
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251 "taskhostex.exe", // Host Process for Windows Tasks
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252 "taskmgr.exe", // Task Manager
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253 "services.exe", // Service Control Manager
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254 };
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255
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256 if (name.empty())
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257 return false;
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258
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259 for (const auto& invalid_name : invalid_names)
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260 if (util::EqualStrings(name, invalid_name))
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261 return false;
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262
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263 return true;
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264 }
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265
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266 /* ------------------------------------------------------------------- */
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267 /* extern functions */
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268
301
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269 bool GetProcessName(pid_t pid, std::string& name) {
342
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270 if (!GetProcessPath(pid, name) || !VerifyProcessPath(name))
301
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271 return false;
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272
342
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273 name = GetFilenameFromPath(name);
340
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274 if (!VerifyProcessFilename(name))
337
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275 return false;
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276
301
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277 return true;
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278 }
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279
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280 bool EnumerateOpenProcesses(process_proc_t process_proc) {
337
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281 Handle process_snap(::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0));
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282 if (process_snap.get() == INVALID_HANDLE_VALUE)
301
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283 return false;
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284
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285 PROCESSENTRY32 pe32;
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diff changeset
286 pe32.dwSize = sizeof(PROCESSENTRY32);
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diff changeset
287
337
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288 if (!::Process32First(process_snap.get(), &pe32))
301
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diff changeset
289 return false;
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diff changeset
290
337
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diff changeset
291 do {
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diff changeset
292 std::string name;
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diff changeset
293 if (!GetProcessName(pe32.th32ProcessID, name))
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diff changeset
294 continue;
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diff changeset
295
342
adb79bdde329 dep/animone: fix tons of issues
Paper <paper@paper.us.eu.org>
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296 if (!process_proc({.pid = pe32.th32ProcessID, .platform = ExecutablePlatform::Win32, .comm = name}))
301
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297 return false;
337
a7d4e5107531 dep/animone: REFACTOR ALL THE THINGS
Paper <paper@paper.us.eu.org>
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298 } while (::Process32Next(process_snap.get(), &pe32));
301
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299
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300 return true;
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301 }
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302
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303 bool EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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304 if (!open_file_proc)
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305 return false;
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306
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307 std::unordered_map<pid_t, Handle> proc_handles;
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308
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309 for (const pid_t& pid : pids) {
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310 const HANDLE handle = ::OpenProcess(PROCESS_DUP_HANDLE, false, pid);
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311 if (handle != INVALID_HANDLE_VALUE)
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312 proc_handles[pid] = Handle(handle);
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313 }
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314
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315 if (proc_handles.empty())
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316 return false;
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317
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318 std::vector<SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX> info = GetSystemHandleInformation();
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319
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320 for (const auto& h : info) {
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321 const pid_t pid = h.UniqueProcessId;
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322 if (!pids.count(pid))
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323 continue;
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324
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325 if (!IsFileHandle(nullptr, h.ObjectTypeIndex))
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326 continue;
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327
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328 if (!IsFileMaskOk(h.GrantedAccess))
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329 continue;
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330
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331 Handle handle(DuplicateHandle(proc_handles[pid].get(), h.HandleValue));
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332 if (handle.get() == INVALID_HANDLE_VALUE)
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333 continue;
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334
340
74e2365326c6 dep/animone: add experimental accessibility strategy
Paper <paper@paper.us.eu.org>
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335 if (::GetFileType(handle.get()) != FILE_TYPE_DISK)
301
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336 continue;
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337
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338 const std::wstring path = GetFinalPathNameByHandle(handle.get());
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339 if (!IsFilePathOk(path))
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340 continue;
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341
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342 if (!open_file_proc({pid, ToUtf8String(path)}))
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343 return false;
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parents: 285
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344 }
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345
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346 return true;
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347 }
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348
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349 } // namespace animone::internal::win32