mirror/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2026-02-17 14:59:14 +00:00
Code Issues Packages Projects Releases Wiki Activity

Windows: Replace CreatePipe with ntdll implementation

Browse Source 
This implementation is now a direct replacement for the `kernel32` one.
New bitflags for named pipes and other generic ones were added based on
browsing the ReactOS sources.

`UNICODE_STRING.Buffer` has also been changed to be nullable, as
this is what makes the implementation work.
This required some changes to places accesssing the buffer after a
`SUCCESS`ful return, most notably `QueryObjectName` which even referred
to it being nullable.
This commit is contained in:
Stephen Gregoratto 2024-03-12 21:13:13 +11:00
parent dbb11915bd
commit 9532f72937
6 changed files with 177 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/std/Thread.zig
View File

@ -208,7 +208,7 @@ pub fn getName(self: Thread, buffer_ptr: *[max_name_len:0]u8) GetNameError!?[]co
)) {
.SUCCESS => {
const string = @as(*const os.windows.UNICODE_STRING, @ptrCast(&buf));
const len = std.unicode.wtf16LeToWtf8(buffer, string.Buffer[0 .. string.Length / 2]);
const len = std.unicode.wtf16LeToWtf8(buffer, string.Buffer.?[0 .. string.Length / 2]);
return if (len > 0) buffer[0..len] else null;
},
.NOT_IMPLEMENTED => return error.Unsupported,

4
lib/std/fs.zig
View File

@ -493,7 +493,7 @@ pub fn openSelfExe(flags: File.OpenFlags) OpenSelfExeError!File {
// not the path that the symlink points to. However, because we are opening
// the file, we can let the openFileW call follow the symlink for us.
const image_path_unicode_string = &os.windows.peb().ProcessParameters.ImagePathName;
const image_path_name = image_path_unicode_string.Buffer[0 .. image_path_unicode_string.Length / 2 :0];
const image_path_name = image_path_unicode_string.Buffer.?[0 .. image_path_unicode_string.Length / 2 :0];
const prefixed_path_w = try os.windows.wToPrefixedFileW(null, image_path_name);
return cwd().openFileW(prefixed_path_w.span(), flags);
}
@ -664,7 +664,7 @@ pub fn selfExePath(out_buffer: []u8) SelfExePathError![]u8 {
},
.windows => {
const image_path_unicode_string = &os.windows.peb().ProcessParameters.ImagePathName;
const image_path_name = image_path_unicode_string.Buffer[0 .. image_path_unicode_string.Length / 2 :0];
const image_path_name = image_path_unicode_string.Buffer.?[0 .. image_path_unicode_string.Length / 2 :0];
// If ImagePathName is a symlink, then it will contain the path of the
// symlink, not the path that the symlink points to. We want the path

177
lib/std/os/windows.zig
View File

@ -153,14 +153,131 @@ pub fn OpenFile(sub_path_w: []const u16, options: OpenFileOptions) OpenError!HAN
}
}
pub const CreatePipeError = error{Unexpected};
pub const CreatePipeError = error{ Unexpected, SystemResources };
var npfs: ?HANDLE = null;
/// A Zig wrapper around `NtCreateNamedPipeFile` and `NtCreateFile` syscalls.
/// It implements similar behavior to `CreatePipe` and is meant to serve
/// as a direct substitute for that call.
pub fn CreatePipe(rd: *HANDLE, wr: *HANDLE, sattr: *const SECURITY_ATTRIBUTES) CreatePipeError!void {
if (kernel32.CreatePipe(rd, wr, sattr, 0) == 0) {
switch (kernel32.GetLastError()) {
else => |err| return unexpectedError(err),
// Up to NT 5.2 (Windows XP/Server 2003), `CreatePipe` would generate a pipe similar to:
//
// \??\pipe\Win32Pipes.{pid}.{count}
//
// where `pid` is the process id and count is a incrementing counter.
// The implementation was changed after NT 6.0 (Vista) to open a handle to the Named Pipe File System
// and use that as the root directory for `NtCreateNamedPipeFile`.
// This object is visible under the NPFS but has no filename attached to it.
//
// This implementation replicates how `CreatePipe` works in modern Windows versions.
const opt_dev_handle = @atomicLoad(?HANDLE, &npfs, .seq_cst);
const dev_handle = opt_dev_handle orelse blk: {
const str = std.unicode.utf8ToUtf16LeStringLiteral("\\Device\\NamedPipe\\");
const len: u16 = @truncate(str.len * @sizeOf(u16));
const name = UNICODE_STRING{
.Length = len,
.MaximumLength = len,
.Buffer = @constCast(@ptrCast(str)),
};
const attrs = OBJECT_ATTRIBUTES{
.ObjectName = @constCast(&name),
.Length = @sizeOf(OBJECT_ATTRIBUTES),
.RootDirectory = null,
.Attributes = 0,
.SecurityDescriptor = null,
.SecurityQualityOfService = null,
};
var iosb: IO_STATUS_BLOCK = undefined;
var handle: HANDLE = undefined;
switch (ntdll.NtCreateFile(
&handle,
GENERIC_READ | SYNCHRONIZE,
@constCast(&attrs),
&iosb,
null,
0,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_SYNCHRONOUS_IO_NONALERT,
null,
0,
)) {
.SUCCESS => {},
// Judging from the ReactOS sources this is technically possible.
.INSUFFICIENT_RESOURCES => return error.SystemResources,
.INVALID_PARAMETER => unreachable,
else => |e| return unexpectedStatus(e),
}
if (@cmpxchgStrong(?HANDLE, &npfs, null, handle, .seq_cst, .seq_cst)) |xchg| {
CloseHandle(handle);
break :blk xchg.?;
} else break :blk handle;
};
const name = UNICODE_STRING{ .Buffer = null, .Length = 0, .MaximumLength = 0 };
var attrs = OBJECT_ATTRIBUTES{
.ObjectName = @constCast(&name),
.Length = @sizeOf(OBJECT_ATTRIBUTES),
.RootDirectory = dev_handle,
.Attributes = OBJ_CASE_INSENSITIVE,
.SecurityDescriptor = sattr.lpSecurityDescriptor,
.SecurityQualityOfService = null,
};
if (sattr.bInheritHandle != 0) attrs.Attributes |= OBJ_INHERIT;
// 120 second relative timeout in 100ns units.
const default_timeout: LARGE_INTEGER = (-120 * std.time.ns_per_s) / 100;
var iosb: IO_STATUS_BLOCK = undefined;
var read: HANDLE = undefined;
switch (ntdll.NtCreateNamedPipeFile(
&read,
GENERIC_READ | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE,
&attrs,
&iosb,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_CREATE,
FILE_SYNCHRONOUS_IO_NONALERT,
FILE_PIPE_BYTE_STREAM_TYPE,
FILE_PIPE_BYTE_STREAM_MODE,
FILE_PIPE_QUEUE_OPERATION,
1,
4096,
4096,
@constCast(&default_timeout),
)) {
.SUCCESS => {},
.INVALID_PARAMETER => unreachable,
.INSUFFICIENT_RESOURCES => return error.SystemResources,
else => |e| return unexpectedStatus(e),
}
errdefer CloseHandle(read);
attrs.RootDirectory = read;
var write: HANDLE = undefined;
switch (ntdll.NtCreateFile(
&write,
FILE_GENERIC_WRITE,
&attrs,
&iosb,
null,
0,
FILE_SHARE_READ,
FILE_OPEN,
FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE,
null,
0,
)) {
.SUCCESS => {},
.INVALID_PARAMETER => unreachable,
.INSUFFICIENT_RESOURCES => return error.SystemResources,
else => |e| return unexpectedStatus(e),
}
rd.* = read;
wr.* = write;
}
pub fn CreateEventEx(attributes: ?*SECURITY_ATTRIBUTES, name: []const u8, flags: DWORD, desired_access: DWORD) !HANDLE {
@ -1050,35 +1167,32 @@ pub fn SetFilePointerEx_CURRENT_get(handle: HANDLE) SetFilePointerError!u64 {
return @as(u64, @bitCast(result));
}
pub fn QueryObjectName(
handle: HANDLE,
out_buffer: []u16,
) ![]u16 {
pub fn QueryObjectName(handle: HANDLE, out_buffer: []u16) ![]u16 {
const out_buffer_aligned = mem.alignInSlice(out_buffer, @alignOf(OBJECT_NAME_INFORMATION)) orelse return error.NameTooLong;
const info = @as(*OBJECT_NAME_INFORMATION, @ptrCast(out_buffer_aligned));
//buffer size is specified in bytes
// buffer size is specified in bytes
const out_buffer_len = std.math.cast(ULONG, out_buffer_aligned.len * 2) orelse std.math.maxInt(ULONG);
//last argument would return the length required for full_buffer, not exposed here
const rc = ntdll.NtQueryObject(handle, .ObjectNameInformation, info, out_buffer_len, null);
switch (rc) {
.SUCCESS => {
// last argument would return the length required for full_buffer, not exposed here
return switch (ntdll.NtQueryObject(handle, .ObjectNameInformation, info, out_buffer_len, null)) {
.SUCCESS => blk: {
// info.Name.Buffer from ObQueryNameString is documented to be null (and MaximumLength == 0)
// if the object was "unnamed", not sure if this can happen for file handles
if (info.Name.MaximumLength == 0) return error.Unexpected;
if (info.Name.MaximumLength == 0) break :blk error.Unexpected;
// resulting string length is specified in bytes
const path_length_unterminated = @divExact(info.Name.Length, 2);
return info.Name.Buffer[0..path_length_unterminated];
break :blk info.Name.Buffer.?[0..path_length_unterminated];
},
.ACCESS_DENIED => return error.AccessDenied,
.INVALID_HANDLE => return error.InvalidHandle,
.ACCESS_DENIED => error.AccessDenied,
.INVALID_HANDLE => error.InvalidHandle,
// triggered when the buffer is too small for the OBJECT_NAME_INFORMATION object (.INFO_LENGTH_MISMATCH),
// or if the buffer is too small for the file path returned (.BUFFER_OVERFLOW, .BUFFER_TOO_SMALL)
.INFO_LENGTH_MISMATCH, .BUFFER_OVERFLOW, .BUFFER_TOO_SMALL => return error.NameTooLong,
else => |e| return unexpectedStatus(e),
}
.INFO_LENGTH_MISMATCH, .BUFFER_OVERFLOW, .BUFFER_TOO_SMALL => error.NameTooLong,
else => |e| unexpectedStatus(e),
};
}
test "QueryObjectName" {
test QueryObjectName {
if (builtin.os.tag != .windows)
return;
@ -3186,6 +3300,25 @@ pub const FILE_ATTRIBUTE_SYSTEM = 0x4;
pub const FILE_ATTRIBUTE_TEMPORARY = 0x100;
pub const FILE_ATTRIBUTE_VIRTUAL = 0x10000;
pub const FILE_ALL_ACCESS = STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | 0x1ff;
pub const FILE_GENERIC_READ = STANDARD_RIGHTS_READ | FILE_READ_DATA | FILE_READ_ATTRIBUTES | FILE_READ_EA | SYNCHRONIZE;
pub const FILE_GENERIC_WRITE = STANDARD_RIGHTS_WRITE | FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA | FILE_APPEND_DATA | SYNCHRONIZE;
pub const FILE_GENERIC_EXECUTE = STANDARD_RIGHTS_EXECUTE | FILE_READ_ATTRIBUTES | FILE_EXECUTE | SYNCHRONIZE;
// Flags for NtCreateNamedPipeFile
// NamedPipeType
pub const FILE_PIPE_BYTE_STREAM_TYPE = 0x0;
pub const FILE_PIPE_MESSAGE_TYPE = 0x1;
pub const FILE_PIPE_ACCEPT_REMOTE_CLIENTS = 0x0;
pub const FILE_PIPE_REJECT_REMOTE_CLIENTS = 0x2;
pub const FILE_PIPE_TYPE_VALID_MASK = 0x3;
// CompletionMode
pub const FILE_PIPE_QUEUE_OPERATION = 0x0;
pub const FILE_PIPE_COMPLETE_OPERATION = 0x1;
// ReadMode
pub const FILE_PIPE_BYTE_STREAM_MODE = 0x0;
pub const FILE_PIPE_MESSAGE_MODE = 0x1;
// flags for CreateEvent
pub const CREATE_EVENT_INITIAL_SET = 0x00000002;
pub const CREATE_EVENT_MANUAL_RESET = 0x00000001;
@ -4151,7 +4284,7 @@ pub const OBJ_VALID_ATTRIBUTES = 0x000003F2;
pub const UNICODE_STRING = extern struct {
Length: c_ushort,
MaximumLength: c_ushort,
Buffer: [*]WCHAR,
Buffer: ?[*]WCHAR,
};
pub const ACTIVATION_CONTEXT_DATA = opaque {};

17
lib/std/os/windows/ntdll.zig
View File

@ -341,3 +341,20 @@ pub extern "ntdll" fn NtProtectVirtualMemory(
pub extern "ntdll" fn RtlExitUserProcess(
ExitStatus: u32,
) callconv(WINAPI) noreturn;
pub extern "ntdll" fn NtCreateNamedPipeFile(
FileHandle: *HANDLE,
DesiredAccess: ULONG,
ObjectAttributes: *OBJECT_ATTRIBUTES,
IoStatusBlock: *IO_STATUS_BLOCK,
ShareAccess: ULONG,
CreateDisposition: ULONG,
CreateOptions: ULONG,
NamedPipeType: ULONG,
ReadMode: ULONG,
CompletionMode: ULONG,
MaximumInstances: ULONG,
InboundQuota: ULONG,
OutboundQuota: ULONG,
DefaultTimeout: *LARGE_INTEGER,
) callconv(WINAPI) NTSTATUS;

2
lib/std/os/windows/test.zig
View File

@ -15,7 +15,7 @@ fn RtlDosPathNameToNtPathName_U(path: [:0]const u16) !windows.PathSpace {
defer windows.ntdll.RtlFreeUnicodeString(&out);
var path_space: windows.PathSpace = undefined;
const out_path = out.Buffer[0 .. out.Length / 2];
const out_path = out.Buffer.?[0 .. out.Length / 2];
@memcpy(path_space.data[0..out_path.len], out_path);
path_space.len = out.Length / 2;
path_space.data[path_space.len] = 0;

2
lib/std/zig/system/windows.zig
View File

@ -160,7 +160,7 @@ fn getCpuInfoFromRegistry(core: usize, args: anytype) !void {
=> {
var buf = @field(args, field.name).value_buf;
const entry = @as(*align(1) const std.os.windows.UNICODE_STRING, @ptrCast(table[i + 1].EntryContext));
const len = try std.unicode.utf16LeToUtf8(buf, entry.Buffer[0 .. entry.Length / 2]);
const len = try std.unicode.utf16LeToUtf8(buf, entry.Buffer.?[0 .. entry.Length / 2]);
buf[len] = 0;
},