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#
# Author:: Seth Chisamore (<schisamo@chef.io>)
# Author:: Mark Mzyk (<mmzyk@ospcode.com>)
# Copyright:: Copyright 2011-2016, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require_relative "../mixin/wide_string"
require_relative "api/file"
require_relative "api/security"
require_relative "error"
require_relative "unicode"
require_relative "version"
class Chef
module ReservedNames::Win32
class File
include Chef::ReservedNames::Win32::API::File
extend Chef::ReservedNames::Win32::API::File
include Chef::Mixin::WideString
extend Chef::Mixin::WideString
# Creates a symbolic link called +new_name+ for the file or directory
# +old_name+.
#
# This method requires Windows Vista or later to work. Otherwise, it
# returns nil as per MRI.
#
def self.link(old_name, new_name)
raise Errno::ENOENT, "(#{old_name}, #{new_name})" unless ::File.exist?(old_name) || ::File.symlink?(old_name)
# TODO do a check for CreateHardLinkW and
# raise NotImplemented exception on older Windows
old_name = encode_path(old_name)
new_name = encode_path(new_name)
unless CreateHardLinkW(new_name, old_name, nil)
Chef::ReservedNames::Win32::Error.raise!
end
end
# Creates a symbolic link called +new_name+ for the file or directory
# +old_name+.
#
# This method requires Windows Vista or later to work. Otherwise, it
# returns nil as per MRI.
#
def self.symlink(old_name, new_name)
# raise Errno::ENOENT, "(#{old_name}, #{new_name})" unless ::File.exist?(old_name) || ::File.symlink?(old_name)
# TODO do a check for CreateSymbolicLinkW and
# raise NotImplemented exception on older Windows
flags = ::File.directory?(old_name) ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0
flags |= SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE if Chef::ReservedNames::Win32::Version.new.win_10_creators_or_higher?
old_name = encode_path(old_name)
new_name = encode_path(new_name)
unless CreateSymbolicLinkW(new_name, old_name, flags)
Chef::ReservedNames::Win32::Error.raise!
end
end
# Return true if the named file is a symbolic link, false otherwise.
#
# This method requires Windows Vista or later to work. Otherwise, it
# always returns false as per MRI.
#
def self.symlink?(file_name)
is_symlink = false
path = encode_path(file_name)
if ::File.exists?(file_name) || ::File.symlink?(file_name)
if (GetFileAttributesW(path) & FILE_ATTRIBUTE_REPARSE_POINT) > 0
file_search_handle(file_name) do |handle, find_data|
if find_data[:dw_reserved_0] == IO_REPARSE_TAG_SYMLINK
is_symlink = true
end
end
end
end
is_symlink
end
def self.realpath(file_name)
if symlink?(file_name)
readlink(file_name)
else
file_name
end
end
# Returns the path of the of the symbolic link referred to by +file+.
#
# Requires Windows Vista or later. On older versions of Windows it
# will raise a NotImplementedError, as per MRI.
#
def self.readlink(link_name)
raise Errno::ENOENT, link_name unless ::File.exists?(link_name) || ::File.symlink?(link_name)
symlink_file_handle(link_name) do |handle|
# Go to DeviceIoControl to get the symlink information
# http://msdn.microsoft.com/en-us/library/windows/desktop/aa364571(v=vs.85).aspx
reparse_buffer = FFI::MemoryPointer.new(MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
parsed_size = FFI::Buffer.new(:long).write_long(0)
if DeviceIoControl(handle, FSCTL_GET_REPARSE_POINT, nil, 0, reparse_buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE, parsed_size, nil) == 0
Chef::ReservedNames::Win32::Error.raise!
end
# Ensure it's a symbolic link
reparse_buffer = REPARSE_DATA_BUFFER.new(reparse_buffer)
if reparse_buffer[:ReparseTag] != IO_REPARSE_TAG_SYMLINK
raise Errno::EACCES, "#{link_name} is not a symlink"
end
# Return the link destination (strip off \??\ at the beginning, which is a local filesystem thing)
link_dest = reparse_buffer.reparse_buffer.substitute_name
if link_dest =~ /^\\\?\?\\/
link_dest = link_dest[4..-1]
end
link_dest
end
end
# Gets the short form of a path (Administrator -> ADMINI~1)
def self.get_short_path_name(path)
path = path.to_wstring
size = GetShortPathNameW(path, nil, 0)
if size == 0
Chef::ReservedNames::Win32::Error.raise!
end
result = FFI::MemoryPointer.new :char, (size + 1) * 2
if GetShortPathNameW(path, result, size + 1) == 0
Chef::ReservedNames::Win32::Error.raise!
end
result.read_wstring(size)
end
# Gets the long form of a path (ADMINI~1 -> Administrator)
def self.get_long_path_name(path)
path = path.to_wstring
size = GetLongPathNameW(path, nil, 0)
if size == 0
Chef::ReservedNames::Win32::Error.raise!
end
result = FFI::MemoryPointer.new :char, (size + 1) * 2
if GetLongPathNameW(path, result, size + 1) == 0
Chef::ReservedNames::Win32::Error.raise!
end
result.read_wstring(size)
end
def self.info(file_name)
Info.new(file_name)
end
def self.version_info(file_name)
VersionInfo.new(file_name)
end
def self.verify_links_supported!
CreateSymbolicLinkW(nil)
rescue Chef::Exceptions::Win32APIFunctionNotImplemented => e
raise e
rescue Exception
# things are ok.
end
def self.file_access_check(path, desired_access)
security_descriptor = Chef::ReservedNames::Win32::Security.get_file_security(path)
token_rights = Chef::ReservedNames::Win32::Security::TOKEN_IMPERSONATE |
Chef::ReservedNames::Win32::Security::TOKEN_QUERY |
Chef::ReservedNames::Win32::Security::TOKEN_DUPLICATE |
Chef::ReservedNames::Win32::Security::STANDARD_RIGHTS_READ
token = Chef::ReservedNames::Win32::Security.open_process_token(
Chef::ReservedNames::Win32::Process.get_current_process,
token_rights
)
duplicate_token = token.duplicate_token(:SecurityImpersonation)
mapping = Chef::ReservedNames::Win32::Security::GENERIC_MAPPING.new
mapping[:GenericRead] = Chef::ReservedNames::Win32::Security::FILE_GENERIC_READ
mapping[:GenericWrite] = Chef::ReservedNames::Win32::Security::FILE_GENERIC_WRITE
mapping[:GenericExecute] = Chef::ReservedNames::Win32::Security::FILE_GENERIC_EXECUTE
mapping[:GenericAll] = Chef::ReservedNames::Win32::Security::FILE_ALL_ACCESS
Chef::ReservedNames::Win32::Security.access_check(security_descriptor, duplicate_token,
desired_access, mapping)
end
def self.delete_volume_mount_point(mount_point)
unless DeleteVolumeMountPointW(wstring(mount_point))
Chef::ReservedNames::Win32::Error.raise!
end
end
def self.set_volume_mount_point(mount_point, name)
unless SetVolumeMountPointW(wstring(mount_point), wstring(name))
Chef::ReservedNames::Win32::Error.raise!
end
end
def self.get_volume_name_for_volume_mount_point(mount_point)
buffer = FFI::MemoryPointer.new(2, 128)
unless GetVolumeNameForVolumeMountPointW(wstring(mount_point), buffer, buffer.size / buffer.type_size)
Chef::ReservedNames::Win32::Error.raise!
end
buffer.read_wstring
end
# ::File compat
class << self
alias :stat :info
end
end
end
end
require_relative "file/info"
require_relative "file/version_info"
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