# win32.py - utility functions that use win32 API

#

# Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import ctypes

import errno

import msvcrt

import os

import random

import subprocess

from . import (

    encoding,

    pycompat,

)

_kernel32 = ctypes.windll.kernel32

_advapi32 = ctypes.windll.advapi32

_user32 = ctypes.windll.user32

_crypt32 = ctypes.windll.crypt32

_BOOL = ctypes.c_long

_WORD = ctypes.c_ushort

_DWORD = ctypes.c_ulong

_UINT = ctypes.c_uint

_LONG = ctypes.c_long

_LPCSTR = _LPSTR = ctypes.c_char_p

_HANDLE = ctypes.c_void_p

_HWND = _HANDLE

_PCCERT_CONTEXT = ctypes.c_void_p

_INVALID_HANDLE_VALUE = _HANDLE(-1).value

# GetLastError

_ERROR_SUCCESS = 0

_ERROR_NO_MORE_FILES = 18

_ERROR_INVALID_PARAMETER = 87

_ERROR_BROKEN_PIPE = 109

_ERROR_INSUFFICIENT_BUFFER = 122

# WPARAM is defined as UINT_PTR (unsigned type)

# LPARAM is defined as LONG_PTR (signed type)

if ctypes.sizeof(ctypes.c_long) == ctypes.sizeof(ctypes.c_void_p):

    _WPARAM = ctypes.c_ulong

    _LPARAM = ctypes.c_long

elif ctypes.sizeof(ctypes.c_longlong) == ctypes.sizeof(ctypes.c_void_p):

    _WPARAM = ctypes.c_ulonglong

    _LPARAM = ctypes.c_longlong

class _FILETIME(ctypes.Structure):

    _fields_ = [('dwLowDateTime', _DWORD),

                ('dwHighDateTime', _DWORD)]

class _BY_HANDLE_FILE_INFORMATION(ctypes.Structure):

    _fields_ = [('dwFileAttributes', _DWORD),

                ('ftCreationTime', _FILETIME),

                ('ftLastAccessTime', _FILETIME),

                ('ftLastWriteTime', _FILETIME),

                ('dwVolumeSerialNumber', _DWORD),

                ('nFileSizeHigh', _DWORD),

                ('nFileSizeLow', _DWORD),

                ('nNumberOfLinks', _DWORD),

                ('nFileIndexHigh', _DWORD),

                ('nFileIndexLow', _DWORD)]

# CreateFile

_FILE_SHARE_READ = 0x00000001

_FILE_SHARE_WRITE = 0x00000002

_FILE_SHARE_DELETE = 0x00000004

_OPEN_EXISTING = 3

_FILE_FLAG_BACKUP_SEMANTICS = 0x02000000

# SetFileAttributes

_FILE_ATTRIBUTE_NORMAL = 0x80

_FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x2000

# Process Security and Access Rights

_PROCESS_QUERY_INFORMATION = 0x0400

# GetExitCodeProcess

_STILL_ACTIVE = 259

class _STARTUPINFO(ctypes.Structure):

    _fields_ = [('cb', _DWORD),

                ('lpReserved', _LPSTR),

                ('lpDesktop', _LPSTR),

                ('lpTitle', _LPSTR),

                ('dwX', _DWORD),

                ('dwY', _DWORD),

                ('dwXSize', _DWORD),

                ('dwYSize', _DWORD),

                ('dwXCountChars', _DWORD),

                ('dwYCountChars', _DWORD),

                ('dwFillAttribute', _DWORD),

                ('dwFlags', _DWORD),

                ('wShowWindow', _WORD),

                ('cbReserved2', _WORD),

                ('lpReserved2', ctypes.c_char_p),

                ('hStdInput', _HANDLE),

                ('hStdOutput', _HANDLE),

                ('hStdError', _HANDLE)]

class _PROCESS_INFORMATION(ctypes.Structure):

    _fields_ = [('hProcess', _HANDLE),

                ('hThread', _HANDLE),

                ('dwProcessId', _DWORD),

                ('dwThreadId', _DWORD)]

_CREATE_NO_WINDOW = 0x08000000

_SW_HIDE = 0

class _COORD(ctypes.Structure):

    _fields_ = [('X', ctypes.c_short),

                ('Y', ctypes.c_short)]

class _SMALL_RECT(ctypes.Structure):

    _fields_ = [('Left', ctypes.c_short),

                ('Top', ctypes.c_short),

                ('Right', ctypes.c_short),

                ('Bottom', ctypes.c_short)]

class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure):

    _fields_ = [('dwSize', _COORD),

                ('dwCursorPosition', _COORD),

                ('wAttributes', _WORD),

                ('srWindow', _SMALL_RECT),

                ('dwMaximumWindowSize', _COORD)]

_STD_OUTPUT_HANDLE = _DWORD(-11).value

_STD_ERROR_HANDLE = _DWORD(-12).value

# CERT_TRUST_STATUS dwErrorStatus

CERT_TRUST_IS_PARTIAL_CHAIN = 0x10000

# CertCreateCertificateContext encodings

X509_ASN_ENCODING = 0x00000001

PKCS_7_ASN_ENCODING = 0x00010000

# These structs are only complete enough to achieve what we need.

class CERT_CHAIN_CONTEXT(ctypes.Structure):

    _fields_ = (

        ("cbSize", _DWORD),

        # CERT_TRUST_STATUS struct

        ("dwErrorStatus", _DWORD),

        ("dwInfoStatus", _DWORD),

        ("cChain", _DWORD),

        ("rgpChain", ctypes.c_void_p),

        ("cLowerQualityChainContext", _DWORD),

        ("rgpLowerQualityChainContext", ctypes.c_void_p),

        ("fHasRevocationFreshnessTime", _BOOL),

        ("dwRevocationFreshnessTime", _DWORD),

    )

class CERT_USAGE_MATCH(ctypes.Structure):

    _fields_ = (

        ("dwType", _DWORD),

         # CERT_ENHKEY_USAGE struct

        ("cUsageIdentifier", _DWORD),

        ("rgpszUsageIdentifier", ctypes.c_void_p), # LPSTR *

    )

class CERT_CHAIN_PARA(ctypes.Structure):

    _fields_ = (

        ("cbSize", _DWORD),

        ("RequestedUsage", CERT_USAGE_MATCH),

        ("RequestedIssuancePolicy", CERT_USAGE_MATCH),

        ("dwUrlRetrievalTimeout", _DWORD),

        ("fCheckRevocationFreshnessTime", _BOOL),

        ("dwRevocationFreshnessTime", _DWORD),

        ("pftCacheResync", ctypes.c_void_p), # LPFILETIME

        ("pStrongSignPara", ctypes.c_void_p), # PCCERT_STRONG_SIGN_PARA

        ("dwStrongSignFlags", _DWORD),

    )

# types of parameters of C functions used (required by pypy)

_crypt32.CertCreateCertificateContext.argtypes = [_DWORD, # cert encoding

                                                  ctypes.c_char_p, # cert

                                                  _DWORD] # cert size

_crypt32.CertCreateCertificateContext.restype = _PCCERT_CONTEXT

_crypt32.CertGetCertificateChain.argtypes = [

        ctypes.c_void_p, # HCERTCHAINENGINE

        _PCCERT_CONTEXT,

        ctypes.c_void_p, # LPFILETIME

        ctypes.c_void_p, # HCERTSTORE

        ctypes.c_void_p, # PCERT_CHAIN_PARA

        _DWORD,

        ctypes.c_void_p, # LPVOID

        ctypes.c_void_p  # PCCERT_CHAIN_CONTEXT *

    ]

_crypt32.CertGetCertificateChain.restype = _BOOL

_crypt32.CertFreeCertificateContext.argtypes = [_PCCERT_CONTEXT]

_crypt32.CertFreeCertificateContext.restype = _BOOL

_kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p,

    _DWORD, _DWORD, _HANDLE]

_kernel32.CreateFileA.restype = _HANDLE

_kernel32.GetFileInformationByHandle.argtypes = [_HANDLE, ctypes.c_void_p]

_kernel32.GetFileInformationByHandle.restype = _BOOL

_kernel32.CloseHandle.argtypes = [_HANDLE]

_kernel32.CloseHandle.restype = _BOOL

try:

    _kernel32.CreateHardLinkA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p]

    _kernel32.CreateHardLinkA.restype = _BOOL

except AttributeError:

    pass

_kernel32.SetFileAttributesA.argtypes = [_LPCSTR, _DWORD]

_kernel32.SetFileAttributesA.restype = _BOOL

_kernel32.OpenProcess.argtypes = [_DWORD, _BOOL, _DWORD]

_kernel32.OpenProcess.restype = _HANDLE

_kernel32.GetExitCodeProcess.argtypes = [_HANDLE, ctypes.c_void_p]

_kernel32.GetExitCodeProcess.restype = _BOOL

_kernel32.GetLastError.argtypes = []

_kernel32.GetLastError.restype = _DWORD

_kernel32.GetModuleFileNameA.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD]

_kernel32.GetModuleFileNameA.restype = _DWORD

_kernel32.CreateProcessA.argtypes = [_LPCSTR, _LPCSTR, ctypes.c_void_p,

    ctypes.c_void_p, _BOOL, _DWORD, ctypes.c_void_p, _LPCSTR, ctypes.c_void_p,

    ctypes.c_void_p]

_kernel32.CreateProcessA.restype = _BOOL

_kernel32.ExitProcess.argtypes = [_UINT]

_kernel32.ExitProcess.restype = None

_kernel32.GetCurrentProcessId.argtypes = []

_kernel32.GetCurrentProcessId.restype = _DWORD

_SIGNAL_HANDLER = ctypes.WINFUNCTYPE(_BOOL, _DWORD)

_kernel32.SetConsoleCtrlHandler.argtypes = [_SIGNAL_HANDLER, _BOOL]

_kernel32.SetConsoleCtrlHandler.restype = _BOOL

_kernel32.SetConsoleMode.argtypes = [_HANDLE, _DWORD]

_kernel32.SetConsoleMode.restype = _BOOL

_kernel32.GetConsoleMode.argtypes = [_HANDLE, ctypes.c_void_p]

_kernel32.GetConsoleMode.restype = _BOOL

_kernel32.GetStdHandle.argtypes = [_DWORD]

_kernel32.GetStdHandle.restype = _HANDLE

_kernel32.GetConsoleScreenBufferInfo.argtypes = [_HANDLE, ctypes.c_void_p]

_kernel32.GetConsoleScreenBufferInfo.restype = _BOOL

_advapi32.GetUserNameA.argtypes = [ctypes.c_void_p, ctypes.c_void_p]

_advapi32.GetUserNameA.restype = _BOOL

_user32.GetWindowThreadProcessId.argtypes = [_HANDLE, ctypes.c_void_p]

_user32.GetWindowThreadProcessId.restype = _DWORD

_user32.ShowWindow.argtypes = [_HANDLE, ctypes.c_int]

_user32.ShowWindow.restype = _BOOL

_WNDENUMPROC = ctypes.WINFUNCTYPE(_BOOL, _HWND, _LPARAM)

_user32.EnumWindows.argtypes = [_WNDENUMPROC, _LPARAM]

_user32.EnumWindows.restype = _BOOL

_kernel32.PeekNamedPipe.argtypes = [_HANDLE, ctypes.c_void_p, _DWORD,

    ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p]

_kernel32.PeekNamedPipe.restype = _BOOL

def _raiseoserror(name):

    # Force the code to a signed int to avoid an 'int too large' error.

    # See https://bugs.python.org/issue28474

    code = _kernel32.GetLastError()

    if code > 0x7fffffff:

        code -= 2**32

    err = ctypes.WinError(code=code)

    raise OSError(err.errno, '%s: %s' % (name,

                                         encoding.strtolocal(err.strerror)))

def _getfileinfo(name):

    fh = _kernel32.CreateFileA(name, 0,

            _FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE,

            None, _OPEN_EXISTING, _FILE_FLAG_BACKUP_SEMANTICS, None)

    if fh == _INVALID_HANDLE_VALUE:

        _raiseoserror(name)

    try:

        fi = _BY_HANDLE_FILE_INFORMATION()

        if not _kernel32.GetFileInformationByHandle(fh, ctypes.byref(fi)):

            _raiseoserror(name)

        return fi

    finally:

        _kernel32.CloseHandle(fh)

def checkcertificatechain(cert, build=True):

    '''Tests the given certificate to see if there is a complete chain to a

       trusted root certificate.  As a side effect, missing certificates are

       downloaded and installed unless ``build=False``.  True is returned if a

       chain to a trusted root exists (even if built on the fly), otherwise

       False.  NB: A chain to a trusted root does NOT imply that the certificate

       is valid.

    '''

    chainctxptr = ctypes.POINTER(CERT_CHAIN_CONTEXT)

    pchainctx = chainctxptr()

    chainpara = CERT_CHAIN_PARA(cbSize=ctypes.sizeof(CERT_CHAIN_PARA),

                                RequestedUsage=CERT_USAGE_MATCH())

    certctx = _crypt32.CertCreateCertificateContext(X509_ASN_ENCODING, cert,

                                                    len(cert))

    if certctx is None:

        _raiseoserror('CertCreateCertificateContext')

    flags = 0

    if not build:

        flags |= 0x100  # CERT_CHAIN_DISABLE_AUTH_ROOT_AUTO_UPDATE

    try:

        # Building the certificate chain will update root certs as necessary.

        if not _crypt32.CertGetCertificateChain(None,      # hChainEngine

                                                certctx,   # pCertContext

                                                None,      # pTime

                                                None,      # hAdditionalStore

                                                ctypes.byref(chainpara),

                                                flags,

                                                None,      # pvReserved

                                                ctypes.byref(pchainctx)):

            _raiseoserror('CertGetCertificateChain')

        chainctx = pchainctx.contents

        return chainctx.dwErrorStatus & CERT_TRUST_IS_PARTIAL_CHAIN == 0

    finally:

        if pchainctx:

            _crypt32.CertFreeCertificateChain(pchainctx)

        _crypt32.CertFreeCertificateContext(certctx)

def oslink(src, dst):

    try:

        if not _kernel32.CreateHardLinkA(dst, src, None):

            _raiseoserror(src)

    except AttributeError: # Wine doesn't support this function

        _raiseoserror(src)

def nlinks(name):

    '''return number of hardlinks for the given file'''

    return _getfileinfo(name).nNumberOfLinks

def samefile(path1, path2):

    '''Returns whether path1 and path2 refer to the same file or directory.'''

    res1 = _getfileinfo(path1)

    res2 = _getfileinfo(path2)

    return (res1.dwVolumeSerialNumber == res2.dwVolumeSerialNumber