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environment.cs
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environment.cs
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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Class: Environment
**
**
** Purpose: Provides some basic access to some environment
** functionality.
**
**
============================================================*/
namespace System {
using System.IO;
using System.Security;
using System.Resources;
using System.Globalization;
using System.Collections;
using System.Security.Permissions;
using System.Text;
using System.Configuration.Assemblies;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
using Microsoft.Win32;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Runtime.ConstrainedExecution;
using System.Runtime.Versioning;
using System.Diagnostics.Contracts;
#if !FEATURE_PAL
[ComVisible(true)]
public enum EnvironmentVariableTarget {
Process = 0,
#if FEATURE_WIN32_REGISTRY
User = 1,
Machine = 2,
#endif
}
#endif
[ComVisible(true)]
public static class Environment {
// Assume the following constants include the terminating '\0' - use <, not <=
const int MaxEnvVariableValueLength = 32767; // maximum length for environment variable name and value
// System environment variables are stored in the registry, and have
// a size restriction that is separate from both normal environment
// variables and registry value name lengths, according to MSDN.
// MSDN doesn't detail whether the name is limited to 1024, or whether
// that includes the contents of the environment variable.
const int MaxSystemEnvVariableLength = 1024;
const int MaxUserEnvVariableLength = 255;
internal sealed class ResourceHelper
{
internal ResourceHelper(String name) {
m_name = name;
}
private String m_name;
private ResourceManager SystemResMgr;
// To avoid infinite loops when calling GetResourceString. See comments
// in GetResourceString for this field.
private Stack currentlyLoading;
// process-wide state (since this is only used in one domain),
// used to avoid the TypeInitialization infinite recusion
// in GetResourceStringCode
internal bool resourceManagerInited = false;
// Is this thread currently doing infinite resource lookups?
private int infinitelyRecursingCount;
// Data representing one individual resource lookup on a thread.
internal class GetResourceStringUserData
{
public ResourceHelper m_resourceHelper;
public String m_key;
public CultureInfo m_culture;
public String m_retVal;
public bool m_lockWasTaken;
public GetResourceStringUserData(ResourceHelper resourceHelper, String key, CultureInfo culture)
{
m_resourceHelper = resourceHelper;
m_key = key;
m_culture = culture;
}
}
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
internal String GetResourceString(String key) {
if (key == null || key.Length == 0) {
Contract.Assert(false, "Environment::GetResourceString with null or empty key. Bug in caller, or weird recursive loading problem?");
return "[Resource lookup failed - null or empty resource name]";
}
return GetResourceString(key, null);
}
[System.Security.SecuritySafeCritical] // auto-generated
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
internal String GetResourceString(String key, CultureInfo culture) {
if (key == null || key.Length == 0) {
Contract.Assert(false, "Environment::GetResourceString with null or empty key. Bug in caller, or weird recursive loading problem?");
return "[Resource lookup failed - null or empty resource name]";
}
// We have a somewhat common potential for infinite
// loops with mscorlib's ResourceManager. If "potentially dangerous"
// code throws an exception, we will get into an infinite loop
// inside the ResourceManager and this "potentially dangerous" code.
// Potentially dangerous code includes the IO package, CultureInfo,
// parts of the loader, some parts of Reflection, Security (including
// custom user-written permissions that may parse an XML file at
// class load time), assembly load event handlers, etc. Essentially,
// this is not a bounded set of code, and we need to fix the problem.
// Fortunately, this is limited to mscorlib's error lookups and is NOT
// a general problem for all user code using the ResourceManager.
// The solution is to make sure only one thread at a time can call
// GetResourceString. Also, since resource lookups can be
// reentrant, if the same thread comes into GetResourceString
// twice looking for the exact same resource name before
// returning, we're going into an infinite loop and we should
// return a bogus string.
GetResourceStringUserData userData = new GetResourceStringUserData(this, key, culture);
RuntimeHelpers.TryCode tryCode = new RuntimeHelpers.TryCode(GetResourceStringCode);
RuntimeHelpers.CleanupCode cleanupCode = new RuntimeHelpers.CleanupCode(GetResourceStringBackoutCode);
RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(tryCode, cleanupCode, userData);
return userData.m_retVal;
}
#if FEATURE_CORECLR
[System.Security.SecurityCritical] // auto-generated
#else
[System.Security.SecuritySafeCritical]
#endif
private void GetResourceStringCode(Object userDataIn)
{
GetResourceStringUserData userData = (GetResourceStringUserData) userDataIn;
ResourceHelper rh = userData.m_resourceHelper;
String key = userData.m_key;
CultureInfo culture = userData.m_culture;
Monitor.Enter(rh, ref userData.m_lockWasTaken);
// Are we recursively looking up the same resource? Note - our backout code will set
// the ResourceHelper's currentlyLoading stack to null if an exception occurs.
if (rh.currentlyLoading != null && rh.currentlyLoading.Count > 0 && rh.currentlyLoading.Contains(key)) {
// We can start infinitely recursing for one resource lookup,
// then during our failure reporting, start infinitely recursing again.
// avoid that.
if (rh.infinitelyRecursingCount > 0) {
userData.m_retVal = "[Resource lookup failed - infinite recursion or critical failure detected.]";
return;
}
rh.infinitelyRecursingCount++;
// This is often a bug in the BCL, security, NLS+ code,
// or the loader somewhere. However, this could also
// be a setup problem - check whether mscorlib &
// clr.dll are both of the same build flavor. Also, user
// code in the resource lookup process (like an assembly
// resolve event or custom CultureInfo) might potentially cause issues.
// Note: our infrastructure for reporting this exception will again cause resource lookup.
// This is the most direct way of dealing with that problem.
String message = "Infinite recursion during resource lookup within mscorlib. This may be a bug in mscorlib, or potentially in certain extensibility points such as assembly resolve events or CultureInfo names. Resource name: " + key;
Assert.Fail("[mscorlib recursive resource lookup bug]", message, Assert.COR_E_FAILFAST, System.Diagnostics.StackTrace.TraceFormat.NoResourceLookup);
Environment.FailFast(message);
}
if (rh.currentlyLoading == null)
rh.currentlyLoading = new Stack(4);
// Call class constructors preemptively, so that we cannot get into an infinite
// loop constructing a TypeInitializationException. If this were omitted,
// we could get the Infinite recursion assert above by failing type initialization
// between the Push and Pop calls below.
if (!rh.resourceManagerInited)
{
// process-critical code here. No ThreadAbortExceptions
// can be thrown here. Other exceptions percolate as normal.
RuntimeHelpers.PrepareConstrainedRegions();
try {
}
finally {
RuntimeHelpers.RunClassConstructor(typeof(ResourceManager).TypeHandle);
RuntimeHelpers.RunClassConstructor(typeof(ResourceReader).TypeHandle);
RuntimeHelpers.RunClassConstructor(typeof(RuntimeResourceSet).TypeHandle);
RuntimeHelpers.RunClassConstructor(typeof(BinaryReader).TypeHandle);
rh.resourceManagerInited = true;
}
}
rh.currentlyLoading.Push(key);
if (rh.SystemResMgr == null) {
rh.SystemResMgr = new ResourceManager(m_name, typeof(Object).Assembly);
}
String s = rh.SystemResMgr.GetString(key, null);
rh.currentlyLoading.Pop();
Contract.Assert(s!=null, "Managed resource string lookup failed. Was your resource name misspelled? Did you rebuild mscorlib after adding a resource to resources.txt? Debug this w/ cordbg and bug whoever owns the code that called Environment.GetResourceString. Resource name was: \""+key+"\"");
userData.m_retVal = s;
}
#if FEATURE_CORECLR
[System.Security.SecurityCritical] // auto-generated
#endif
[PrePrepareMethod]
private void GetResourceStringBackoutCode(Object userDataIn, bool exceptionThrown)
{
GetResourceStringUserData userData = (GetResourceStringUserData) userDataIn;
ResourceHelper rh = userData.m_resourceHelper;
if (exceptionThrown)
{
if (userData.m_lockWasTaken)
{
// Backout code - throw away potentially corrupt state
rh.SystemResMgr = null;
rh.currentlyLoading = null;
}
}
// Release the lock, if we took it.
if (userData.m_lockWasTaken)
{
Monitor.Exit(rh);
}
}
}
private static volatile ResourceHelper m_resHelper; // Doesn't need to be initialized as they're zero-init.
private const int MaxMachineNameLength = 256;
// Private object for locking instead of locking on a public type for SQL reliability work.
private static Object s_InternalSyncObject;
private static Object InternalSyncObject {
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
get {
if (s_InternalSyncObject == null) {
Object o = new Object();
Interlocked.CompareExchange<Object>(ref s_InternalSyncObject, o, null);
}
return s_InternalSyncObject;
}
}
private static volatile OperatingSystem m_os; // Cached OperatingSystem value
/*==================================TickCount===================================
**Action: Gets the number of ticks since the system was started.
**Returns: The number of ticks since the system was started.
**Arguments: None
**Exceptions: None
==============================================================================*/
public static extern int TickCount {
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
get;
}
// Terminates this process with the given exit code.
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.Process)]
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
[SuppressUnmanagedCodeSecurity]
internal static extern void _Exit(int exitCode);
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
#pragma warning disable 618
[SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)]
#pragma warning restore 618
public static void Exit(int exitCode) {
_Exit(exitCode);
}
public static extern int ExitCode {
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
get;
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
set;
}
// Note: The CLR's Watson bucketization code looks at the caller of the FCALL method
// to assign blame for crashes. Don't mess with this, such as by making it call
// another managed helper method, unless you consult with some CLR Watson experts.
[System.Security.SecurityCritical]
[ResourceExposure(ResourceScope.Process)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public static extern void FailFast(String message);
[System.Security.SecurityCritical]
[ResourceExposure(ResourceScope.Process)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal static extern void FailFast(String message, uint exitCode);
// This overload of FailFast will allow you to specify the exception object
// whose bucket details *could* be used when undergoing the failfast process.
// To be specific:
//
// 1) When invoked from within a managed EH clause (fault/finally/catch),
// if the exception object is preallocated, the runtime will try to find its buckets
// and use them. If the exception object is not preallocated, it will use the bucket
// details contained in the object (if any).
//
// 2) When invoked from outside the managed EH clauses (fault/finally/catch),
// if the exception object is preallocated, the runtime will use the callsite's
// IP for bucketing. If the exception object is not preallocated, it will use the bucket
// details contained in the object (if any).
[System.Security.SecurityCritical]
[ResourceExposure(ResourceScope.Process)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public static extern void FailFast(String message, Exception exception);
#if !FEATURE_CORECLR
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
[SecurityCritical] // Our security team doesn't yet allow safe-critical P/Invoke methods.
[ResourceExposure(ResourceScope.None)]
[SuppressUnmanagedCodeSecurity]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
internal static extern void TriggerCodeContractFailure(ContractFailureKind failureKind, String message, String condition, String exceptionAsString);
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
[SecurityCritical] // Our security team doesn't yet allow safe-critical P/Invoke methods.
[ResourceExposure(ResourceScope.None)]
[SuppressUnmanagedCodeSecurity]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetIsCLRHosted();
internal static bool IsCLRHosted {
[SecuritySafeCritical]
get { return GetIsCLRHosted(); }
}
public static String CommandLine {
[System.Security.SecuritySafeCritical] // auto-generated
get {
new EnvironmentPermission(EnvironmentPermissionAccess.Read, "Path").Demand();
String commandLine = null;
GetCommandLine(JitHelpers.GetStringHandleOnStack(ref commandLine));
return commandLine;
}
}
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode), SuppressUnmanagedCodeSecurity]
private static extern void GetCommandLine(StringHandleOnStack retString);
#endif // !FEATURE_CORECLR
/*===============================CurrentDirectory===============================
**Action: Provides a getter and setter for the current directory. The original
** current directory is the one from which the process was started.
**Returns: The current directory (from the getter). Void from the setter.
**Arguments: The current directory to which to switch to the setter.
**Exceptions:
==============================================================================*/
public static String CurrentDirectory
{
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
get{
return Directory.GetCurrentDirectory();
}
#if FEATURE_CORECLR
[System.Security.SecurityCritical] // auto-generated
#endif
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
set {
Directory.SetCurrentDirectory(value);
}
}
// Returns the system directory (ie, C:\WinNT\System32).
public static String SystemDirectory {
#if FEATURE_CORECLR
[System.Security.SecurityCritical]
#else
[System.Security.SecuritySafeCritical] // auto-generated
#endif
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
get {
StringBuilder sb = new StringBuilder(Path.MAX_PATH);
int r = Win32Native.GetSystemDirectory(sb, Path.MAX_PATH);
Contract.Assert(r < Path.MAX_PATH, "r < Path.MAX_PATH");
if (r==0) __Error.WinIOError();
String path = sb.ToString();
#if !FEATURE_CORECLR
// Do security check
FileIOPermission.QuickDemand(FileIOPermissionAccess.PathDiscovery, path);
#endif
return path;
}
}
#if !FEATURE_PAL
// Returns the windows directory (ie, C:\WinNT).
// Used by NLS+ custom culures only at the moment.
internal static String InternalWindowsDirectory {
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
get {
StringBuilder sb = new StringBuilder(Path.MAX_PATH);
int r = Win32Native.GetWindowsDirectory(sb, Path.MAX_PATH);
Contract.Assert(r < Path.MAX_PATH, "r < Path.MAX_PATH");
if (r==0) __Error.WinIOError();
String path = sb.ToString();
return path;
}
}
[System.Security.SecuritySafeCritical] // auto-generated
public static String ExpandEnvironmentVariables(String name)
{
if (name == null)
throw new ArgumentNullException("name");
Contract.EndContractBlock();
if (name.Length == 0) {
return name;
}
if (AppDomain.IsAppXModel() && !AppDomain.IsAppXDesignMode()) {
// Environment variable accessors are not approved modern API.
// Behave as if no variables are defined in this case.
return name;
}
int currentSize = 100;
StringBuilder blob = new StringBuilder(currentSize); // A somewhat reasonable default size
int size;
#if !FEATURE_CORECLR
bool isFullTrust = CodeAccessSecurityEngine.QuickCheckForAllDemands();
// Do a security check to guarantee we can read each of the
// individual environment variables requested here.
String[] varArray = name.Split(new char[] {'%'});
StringBuilder vars = isFullTrust ? null : new StringBuilder();
bool fJustExpanded = false; // to accommodate expansion alg.
for(int i=1; i<varArray.Length-1; i++) { // Skip first and last tokens
// ExpandEnvironmentStrings' greedy algorithm expands every
// non-boundary %-delimited substring, provided the previous
// has not been expanded.
// if "foo" is not expandable, and "PATH" is, then both
// %foo%PATH% and %foo%foo%PATH% will expand PATH, but
// %PATH%PATH% will expand only once.
// Therefore, if we've just expanded, skip this substring.
if (varArray[i].Length == 0 || fJustExpanded == true)
{
fJustExpanded = false;
continue; // Nothing to expand
}
// Guess a somewhat reasonable initial size, call the method, then if
// it fails (ie, the return value is larger than our buffer size),
// make a new buffer & try again.
blob.Length = 0;
String envVar = "%" + varArray[i] + "%";
size = Win32Native.ExpandEnvironmentStrings(envVar, blob, currentSize);
if (size == 0)
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
// some environment variable might be changed while this function is called
while (size > currentSize) {
currentSize = size;
blob.Capacity = currentSize;
blob.Length = 0;
size = Win32Native.ExpandEnvironmentStrings(envVar, blob, currentSize);
if (size == 0)
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
if (!isFullTrust) {
String temp = blob.ToString();
fJustExpanded = (temp != envVar);
if (fJustExpanded) { // We expanded successfully, we need to do String comparison here
// since %FOO% can become %FOOD
vars.Append(varArray[i]);
vars.Append(';');
}
}
}
if (!isFullTrust)
new EnvironmentPermission(EnvironmentPermissionAccess.Read, vars.ToString()).Demand();
#endif // !FEATURE_CORECLR
blob.Length = 0;
size = Win32Native.ExpandEnvironmentStrings(name, blob, currentSize);
if (size == 0)
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
while (size > currentSize) {
currentSize = size;
blob.Capacity = currentSize;
blob.Length = 0;
size = Win32Native.ExpandEnvironmentStrings(name, blob, currentSize);
if (size == 0)
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
return blob.ToString();
}
#endif // FEATURE_PAL
public static String MachineName {
[System.Security.SecuritySafeCritical] // auto-generated
get {
// In future release of operating systems, you might be able to rename a machine without
// rebooting. Therefore, don't cache this machine name.
new EnvironmentPermission(EnvironmentPermissionAccess.Read, "COMPUTERNAME").Demand();
StringBuilder buf = new StringBuilder(MaxMachineNameLength);
int len = MaxMachineNameLength;
if (Win32Native.GetComputerName(buf, ref len) == 0)
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ComputerName"));
return buf.ToString();
}
}
[SecurityCritical]
[DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
[SuppressUnmanagedCodeSecurity]
private static extern Int32 GetProcessorCount();
public static int ProcessorCount {
[System.Security.SecuritySafeCritical] // auto-generated
get {
return GetProcessorCount();
}
}
public static int SystemPageSize {
[System.Security.SecuritySafeCritical] // auto-generated
get {
(new EnvironmentPermission(PermissionState.Unrestricted)).Demand();
Win32Native.SYSTEM_INFO info = new Win32Native.SYSTEM_INFO();
Win32Native.GetSystemInfo(ref info);
return info.dwPageSize;
}
}
#if !FEATURE_CORECLR
/*==============================GetCommandLineArgs==============================
**Action: Gets the command line and splits it appropriately to deal with whitespace,
** quotes, and escape characters.
**Returns: A string array containing your command line arguments.
**Arguments: None
**Exceptions: None.
==============================================================================*/
[System.Security.SecuritySafeCritical] // auto-generated
public static String[] GetCommandLineArgs() {
new EnvironmentPermission(EnvironmentPermissionAccess.Read, "Path").Demand();
return GetCommandLineArgsNative();
}
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.None)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern String[] GetCommandLineArgsNative();
// We need to keep this Fcall since it is used in AppDomain.cs.
// If we call GetEnvironmentVariable from AppDomain.cs, we will use StringBuilder class.
// That has side effect to change the ApartmentState of the calling Thread to MTA.
// So runtime can't change the ApartmentState of calling thread any more.
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.Process)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal static extern String nativeGetEnvironmentVariable(String variable);
#endif //!FEATURE_CORECLR
/*============================GetEnvironmentVariable============================
**Action:
**Returns:
**Arguments:
**Exceptions:
==============================================================================*/
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String GetEnvironmentVariable(String variable)
{
if (variable == null)
throw new ArgumentNullException("variable");
Contract.EndContractBlock();
if (AppDomain.IsAppXModel() && !AppDomain.IsAppXDesignMode()) {
// Environment variable accessors are not approved modern API.
// Behave as if the variable was not found in this case.
return null;
}
#if !FEATURE_CORECLR
(new EnvironmentPermission(EnvironmentPermissionAccess.Read, variable)).Demand();
#endif //!FEATURE_CORECLR
StringBuilder blob = StringBuilderCache.Acquire(128); // A somewhat reasonable default size
int requiredSize = Win32Native.GetEnvironmentVariable(variable, blob, blob.Capacity);
if (requiredSize == 0) { // GetEnvironmentVariable failed
if (Marshal.GetLastWin32Error() == Win32Native.ERROR_ENVVAR_NOT_FOUND) {
StringBuilderCache.Release(blob);
return null;
}
}
while (requiredSize > blob.Capacity) { // need to retry since the environment variable might be changed
blob.Capacity = requiredSize;
blob.Length = 0;
requiredSize = Win32Native.GetEnvironmentVariable(variable, blob, blob.Capacity);
}
return StringBuilderCache.GetStringAndRelease(blob);
}
#if !FEATURE_PAL
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static string GetEnvironmentVariable( string variable, EnvironmentVariableTarget target)
{
if (variable == null)
{
throw new ArgumentNullException("variable");
}
Contract.EndContractBlock();
if (target == EnvironmentVariableTarget.Process)
{
return GetEnvironmentVariable(variable);
}
#if FEATURE_WIN32_REGISTRY
(new EnvironmentPermission(PermissionState.Unrestricted)).Demand();
if( target == EnvironmentVariableTarget.Machine) {
using (RegistryKey environmentKey =
Registry.LocalMachine.OpenSubKey(@"System\CurrentControlSet\Control\Session Manager\Environment", false)) {
Contract.Assert(environmentKey != null, @"HKLM\System\CurrentControlSet\Control\Session Manager\Environment is missing!");
if (environmentKey == null) {
return null;
}
string value = environmentKey.GetValue(variable) as string;
return value;
}
}
else if( target == EnvironmentVariableTarget.User) {
using (RegistryKey environmentKey =
Registry.CurrentUser.OpenSubKey("Environment", false)) {
Contract.Assert(environmentKey != null, @"HKCU\Environment is missing!");
if (environmentKey == null) {
return null;
}
string value = environmentKey.GetValue(variable) as string;
return value;
}
}
else
#endif // FEATURE_WIN32_REGISTRY
{
throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)target));
}
}
#endif
/*===========================GetEnvironmentVariables============================
**Action: Returns an IDictionary containing all enviroment variables and their values.
**Returns: An IDictionary containing all environment variables and their values.
**Arguments: None.
**Exceptions: None.
==============================================================================*/
[System.Security.SecurityCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
private unsafe static char[] GetEnvironmentCharArray()
{
char[] block = null;
// Make sure pStrings is not leaked with async exceptions
RuntimeHelpers.PrepareConstrainedRegions();
try {
}
finally {
char * pStrings = null;
try
{
pStrings = Win32Native.GetEnvironmentStrings();
if (pStrings == null) {
throw new OutOfMemoryException();
}
// Format for GetEnvironmentStrings is:
// [=HiddenVar=value\0]* [Variable=value\0]* \0
// See the description of Environment Blocks in MSDN's
// CreateProcess page (null-terminated array of null-terminated strings).
// Search for terminating \0\0 (two unicode \0's).
char * p = pStrings;
while (!(*p == '\0' && *(p + 1) == '\0'))
p++;
int len = (int)(p - pStrings + 1);
block = new char[len];
fixed (char* pBlock = block)
String.wstrcpy(pBlock, pStrings, len);
}
finally
{
if (pStrings != null)
Win32Native.FreeEnvironmentStrings(pStrings);
}
}
return block;
}
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static IDictionary GetEnvironmentVariables()
{
if (AppDomain.IsAppXModel() && !AppDomain.IsAppXDesignMode()) {
// Environment variable accessors are not approved modern API.
// Behave as if no environment variables are defined in this case.
return new Hashtable(0);
}
#if !FEATURE_CORECLR
bool isFullTrust = CodeAccessSecurityEngine.QuickCheckForAllDemands();
StringBuilder vars = isFullTrust ? null : new StringBuilder();
bool first = true;
#endif
char[] block = GetEnvironmentCharArray();
Hashtable table = new Hashtable(20);
// Copy strings out, parsing into pairs and inserting into the table.
// The first few environment variable entries start with an '='!
// The current working directory of every drive (except for those drives
// you haven't cd'ed into in your DOS window) are stored in the
// environment block (as =C:=pwd) and the program's exit code is
// as well (=ExitCode=00000000) Skip all that start with =.
// Read docs about Environment Blocks on MSDN's CreateProcess page.
// Format for GetEnvironmentStrings is:
// (=HiddenVar=value\0 | Variable=value\0)* \0
// See the description of Environment Blocks in MSDN's
// CreateProcess page (null-terminated array of null-terminated strings).
// Note the =HiddenVar's aren't always at the beginning.
for(int i=0; i<block.Length; i++) {
int startKey = i;
// Skip to key
// On some old OS, the environment block can be corrupted.
// Someline will not have '=', so we need to check for '\0'.
while(block[i]!='=' && block[i] != '\0') {
i++;
}
if(block[i] == '\0') {
continue;
}
// Skip over environment variables starting with '='
if (i-startKey==0) {
while(block[i]!=0) {
i++;
}
continue;
}
String key = new String(block, startKey, i-startKey);
i++; // skip over '='
int startValue = i;
while(block[i]!=0) {
// Read to end of this entry
i++;
}
String value = new String(block, startValue, i-startValue);
// skip over 0 handled by for loop's i++
table[key]=value;
#if !FEATURE_CORECLR
if (!isFullTrust) {
if( first) {
first = false;
}
else {
vars.Append(';');
}
vars.Append(key);
}
#endif
}
#if !FEATURE_CORECLR
if (!isFullTrust)
new EnvironmentPermission(EnvironmentPermissionAccess.Read, vars.ToString()).Demand();
#endif
return table;
}
#if !FEATURE_PAL
internal static IDictionary GetRegistryKeyNameValuePairs(RegistryKey registryKey) {
Hashtable table = new Hashtable(20);
if (registryKey != null) {
string[] names = registryKey.GetValueNames();
foreach( string name in names) {
string value = registryKey.GetValue(name, "").ToString();
table.Add(name, value);
}
}
return table;
}
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static IDictionary GetEnvironmentVariables( EnvironmentVariableTarget target) {
if( target == EnvironmentVariableTarget.Process) {
return GetEnvironmentVariables();
}
#if FEATURE_WIN32_REGISTRY
(new EnvironmentPermission(PermissionState.Unrestricted)).Demand();
if( target == EnvironmentVariableTarget.Machine) {
using (RegistryKey environmentKey =
Registry.LocalMachine.OpenSubKey(@"System\CurrentControlSet\Control\Session Manager\Environment", false)) {
return GetRegistryKeyNameValuePairs(environmentKey);
}
}
else if( target == EnvironmentVariableTarget.User) {
using (RegistryKey environmentKey =
Registry.CurrentUser.OpenSubKey("Environment", false)) {
return GetRegistryKeyNameValuePairs(environmentKey);
}
}
else
#endif // FEATURE_WIN32_REGISTRY
{
throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)target));
}
}
#endif
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetEnvironmentVariable(string variable, string value) {
CheckEnvironmentVariableName(variable);
#if !FEATURE_CORECLR
new EnvironmentPermission(PermissionState.Unrestricted).Demand();
#endif
// explicitly null out value if is the empty string.
if (String.IsNullOrEmpty(value) || value[0] == '\0') {
value = null;
}
else {
if( value.Length >= MaxEnvVariableValueLength) {
throw new ArgumentException(Environment.GetResourceString("Argument_LongEnvVarValue"));
}
}
if (AppDomain.IsAppXModel() && !AppDomain.IsAppXDesignMode()) {
// Environment variable accessors are not approved modern API.
// so we throw PlatformNotSupportedException.
throw new PlatformNotSupportedException();
}
if(!Win32Native.SetEnvironmentVariable(variable, value)) {
int errorCode = Marshal.GetLastWin32Error();
// Allow user to try to clear a environment variable
if( errorCode == Win32Native.ERROR_ENVVAR_NOT_FOUND) {
return;
}
// The error message from Win32 is "The filename or extension is too long",
// which is not accurate.
if( errorCode == Win32Native.ERROR_FILENAME_EXCED_RANGE) {
throw new ArgumentException(Environment.GetResourceString("Argument_LongEnvVarValue"));
}
throw new ArgumentException(Win32Native.GetMessage(errorCode));
}
}
private static void CheckEnvironmentVariableName(string variable) {
if (variable == null) {
throw new ArgumentNullException("variable");
}
if( variable.Length == 0) {
throw new ArgumentException(Environment.GetResourceString("Argument_StringZeroLength"), "variable");
}
if( variable[0] == '\0') {
throw new ArgumentException(Environment.GetResourceString("Argument_StringFirstCharIsZero"), "variable");
}
// Make sure the environment variable name isn't longer than the
// max limit on environment variable values. (MSDN is ambiguous
// on whether this check is necessary.)
if( variable.Length >= MaxEnvVariableValueLength ) {
throw new ArgumentException(Environment.GetResourceString("Argument_LongEnvVarValue"));
}
if( variable.IndexOf('=') != -1) {
throw new ArgumentException(Environment.GetResourceString("Argument_IllegalEnvVarName"));
}
Contract.EndContractBlock();
}
#if !FEATURE_PAL
[System.Security.SecuritySafeCritical] // auto-generated
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetEnvironmentVariable(string variable, string value, EnvironmentVariableTarget target) {
if( target == EnvironmentVariableTarget.Process) {
SetEnvironmentVariable(variable, value);
return;
}
CheckEnvironmentVariableName(variable);
// System-wide environment variables stored in the registry are
// limited to 1024 chars for the environment variable name.
if (variable.Length >= MaxSystemEnvVariableLength) {
throw new ArgumentException(Environment.GetResourceString("Argument_LongEnvVarName"));
}
new EnvironmentPermission(PermissionState.Unrestricted).Demand();
// explicitly null out value if is the empty string.
if (String.IsNullOrEmpty(value) || value[0] == '\0') {
value = null;
}
#if FEATURE_WIN32_REGISTRY
if( target == EnvironmentVariableTarget.Machine) {
using (RegistryKey environmentKey =
Registry.LocalMachine.OpenSubKey(@"System\CurrentControlSet\Control\Session Manager\Environment", true)) {
Contract.Assert(environmentKey != null, @"HKLM\System\CurrentControlSet\Control\Session Manager\Environment is missing!");
if (environmentKey != null) {
if (value == null)
environmentKey.DeleteValue(variable, false);
else
environmentKey.SetValue(variable, value);
}
}
}
else if( target == EnvironmentVariableTarget.User) {
// User-wide environment variables stored in the registry are
// limited to 255 chars for the environment variable name.
if (variable.Length >= MaxUserEnvVariableLength) {
throw new ArgumentException(Environment.GetResourceString("Argument_LongEnvVarValue"));
}
using (RegistryKey environmentKey =