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Start drafting CreateSymbolicLink using ntdll syscalls

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This commit is contained in:
Jakub Konka 2020-07-21 00:08:48 +02:00
parent 2c9c13f624
commit c53bcd027f
2 changed files with 47 additions and 0 deletions
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46
lib/std/os/windows.zig
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@ -604,6 +604,52 @@ pub fn GetCurrentDirectory(buffer: []u8) GetCurrentDirectoryError![]u8 {
pub const CreateSymbolicLinkError = error{ AccessDenied, PathAlreadyExists, FileNotFound, NameTooLong, InvalidUtf8, BadPathName, Unexpected };
pub fn NtCreateSymbolicLinkW(dir: ?HANDLE, sym_link_path: []const u16, target_path: []const u16) CreateSymbolicLinkError!void {
const SYMLINK_DATA = extern struct {
ReparseTag: ULONG,
ReparseDataLength: USHORT,
Reserved: USHORT,
SubstituteNameOffset: USHORT,
SubstituteNameLength: USHORT,
PrintNameOffset: USHORT,
PrintNameLength: USHORT,
Flags: ULONG,
};
const symlink_handle = OpenFile(sym_link_path, .{
.access_mask = SYNCHRONIZE | GENERIC_READ | GENERIC_WRITE,
.dir = dir,
.creation = FILE_CREATE,
.io_mode = .blocking,
}) catch |err| switch (err) {
error.IsDir => unreachable, // TODO
else => |e| unreachable,
};
defer CloseHandle(symlink_handle);
// prepare reparse data buffer
var buffer: [MAXIMUM_REPARSE_DATA_BUFFER_SIZE]u8 = undefined;
const buf_len = @sizeOf(SYMLINK_DATA) + target_path.len * 4;
const header_len = @sizeOf(ULONG) + @sizeOf(USHORT) * 2;
const symlink_data = SYMLINK_DATA{
.ReparseTag = IO_REPARSE_TAG_SYMLINK,
.ReparseDataLength = @intCast(u16, buf_len - header_len),
.Reserved = 0,
.SubstituteNameOffset = @intCast(u16, target_path.len * 2),
.SubstituteNameLength = @intCast(u16, target_path.len * 2),
.PrintNameOffset = 0,
.PrintNameLength = @intCast(u16, target_path.len * 2),
.Flags = if (dir) |_| SYMLINK_FLAG_RELATIVE else 0,
};
std.mem.copy(u8, buffer[0..], std.mem.asBytes(&symlink_data));
@memcpy(buffer[@sizeOf(SYMLINK_DATA)..], @ptrCast([*]const u8, target_path), target_path.len * 2);
const paths_start = @sizeOf(SYMLINK_DATA) + target_path.len * 2;
@memcpy(buffer[paths_start..].ptr, @ptrCast([*]const u8, target_path), target_path.len * 2);
// TODO replace with NtDeviceIoControl
_ = try DeviceIoControl(symlink_handle, FSCTL_SET_REPARSE_POINT, buffer[0..buf_len], null, null);
}
pub fn CreateSymbolicLink(
sym_link_path: []const u8,
target_path: []const u8,

1
lib/std/os/windows/bits.zig
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@ -1565,6 +1565,7 @@ pub const MOUNT_POINT_REPARSE_BUFFER = extern struct {
PathBuffer: [1]WCHAR,
};
pub const MAXIMUM_REPARSE_DATA_BUFFER_SIZE: ULONG = 16 * 1024;
pub const FSCTL_SET_REPARSE_POINT: DWORD = 0x900a4;
pub const FSCTL_GET_REPARSE_POINT: DWORD = 0x900a8;
pub const IO_REPARSE_TAG_SYMLINK: ULONG = 0xa000000c;
pub const IO_REPARSE_TAG_MOUNT_POINT: ULONG = 0xa0000003;