mirror of
https://gitea.com/Lydanne/buildx.git
synced 2025-11-04 10:03:42 +08:00
379 lines
11 KiB
Go
379 lines
11 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package windows
|
|
|
|
import (
|
|
"sync"
|
|
"sync/atomic"
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
// DLLError describes reasons for DLL load failures.
|
|
type DLLError struct {
|
|
Err error
|
|
ObjName string
|
|
Msg string
|
|
}
|
|
|
|
func (e *DLLError) Error() string { return e.Msg }
|
|
|
|
// Implemented in runtime/syscall_windows.goc; we provide jumps to them in our assembly file.
|
|
func loadlibrary(filename *uint16) (handle uintptr, err syscall.Errno)
|
|
func getprocaddress(handle uintptr, procname *uint8) (proc uintptr, err syscall.Errno)
|
|
|
|
// A DLL implements access to a single DLL.
|
|
type DLL struct {
|
|
Name string
|
|
Handle Handle
|
|
}
|
|
|
|
// LoadDLL loads DLL file into memory.
|
|
//
|
|
// Warning: using LoadDLL without an absolute path name is subject to
|
|
// DLL preloading attacks. To safely load a system DLL, use LazyDLL
|
|
// with System set to true, or use LoadLibraryEx directly.
|
|
func LoadDLL(name string) (dll *DLL, err error) {
|
|
namep, err := UTF16PtrFromString(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
h, e := loadlibrary(namep)
|
|
if e != 0 {
|
|
return nil, &DLLError{
|
|
Err: e,
|
|
ObjName: name,
|
|
Msg: "Failed to load " + name + ": " + e.Error(),
|
|
}
|
|
}
|
|
d := &DLL{
|
|
Name: name,
|
|
Handle: Handle(h),
|
|
}
|
|
return d, nil
|
|
}
|
|
|
|
// MustLoadDLL is like LoadDLL but panics if load operation failes.
|
|
func MustLoadDLL(name string) *DLL {
|
|
d, e := LoadDLL(name)
|
|
if e != nil {
|
|
panic(e)
|
|
}
|
|
return d
|
|
}
|
|
|
|
// FindProc searches DLL d for procedure named name and returns *Proc
|
|
// if found. It returns an error if search fails.
|
|
func (d *DLL) FindProc(name string) (proc *Proc, err error) {
|
|
namep, err := BytePtrFromString(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
a, e := getprocaddress(uintptr(d.Handle), namep)
|
|
if e != 0 {
|
|
return nil, &DLLError{
|
|
Err: e,
|
|
ObjName: name,
|
|
Msg: "Failed to find " + name + " procedure in " + d.Name + ": " + e.Error(),
|
|
}
|
|
}
|
|
p := &Proc{
|
|
Dll: d,
|
|
Name: name,
|
|
addr: a,
|
|
}
|
|
return p, nil
|
|
}
|
|
|
|
// MustFindProc is like FindProc but panics if search fails.
|
|
func (d *DLL) MustFindProc(name string) *Proc {
|
|
p, e := d.FindProc(name)
|
|
if e != nil {
|
|
panic(e)
|
|
}
|
|
return p
|
|
}
|
|
|
|
// Release unloads DLL d from memory.
|
|
func (d *DLL) Release() (err error) {
|
|
return FreeLibrary(d.Handle)
|
|
}
|
|
|
|
// A Proc implements access to a procedure inside a DLL.
|
|
type Proc struct {
|
|
Dll *DLL
|
|
Name string
|
|
addr uintptr
|
|
}
|
|
|
|
// Addr returns the address of the procedure represented by p.
|
|
// The return value can be passed to Syscall to run the procedure.
|
|
func (p *Proc) Addr() uintptr {
|
|
return p.addr
|
|
}
|
|
|
|
//go:uintptrescapes
|
|
|
|
// Call executes procedure p with arguments a. It will panic, if more than 15 arguments
|
|
// are supplied.
|
|
//
|
|
// The returned error is always non-nil, constructed from the result of GetLastError.
|
|
// Callers must inspect the primary return value to decide whether an error occurred
|
|
// (according to the semantics of the specific function being called) before consulting
|
|
// the error. The error will be guaranteed to contain windows.Errno.
|
|
func (p *Proc) Call(a ...uintptr) (r1, r2 uintptr, lastErr error) {
|
|
switch len(a) {
|
|
case 0:
|
|
return syscall.Syscall(p.Addr(), uintptr(len(a)), 0, 0, 0)
|
|
case 1:
|
|
return syscall.Syscall(p.Addr(), uintptr(len(a)), a[0], 0, 0)
|
|
case 2:
|
|
return syscall.Syscall(p.Addr(), uintptr(len(a)), a[0], a[1], 0)
|
|
case 3:
|
|
return syscall.Syscall(p.Addr(), uintptr(len(a)), a[0], a[1], a[2])
|
|
case 4:
|
|
return syscall.Syscall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], 0, 0)
|
|
case 5:
|
|
return syscall.Syscall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], 0)
|
|
case 6:
|
|
return syscall.Syscall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5])
|
|
case 7:
|
|
return syscall.Syscall9(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], 0, 0)
|
|
case 8:
|
|
return syscall.Syscall9(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], 0)
|
|
case 9:
|
|
return syscall.Syscall9(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8])
|
|
case 10:
|
|
return syscall.Syscall12(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], 0, 0)
|
|
case 11:
|
|
return syscall.Syscall12(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], 0)
|
|
case 12:
|
|
return syscall.Syscall12(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11])
|
|
case 13:
|
|
return syscall.Syscall15(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], 0, 0)
|
|
case 14:
|
|
return syscall.Syscall15(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], a[13], 0)
|
|
case 15:
|
|
return syscall.Syscall15(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], a[13], a[14])
|
|
default:
|
|
panic("Call " + p.Name + " with too many arguments " + itoa(len(a)) + ".")
|
|
}
|
|
}
|
|
|
|
// A LazyDLL implements access to a single DLL.
|
|
// It will delay the load of the DLL until the first
|
|
// call to its Handle method or to one of its
|
|
// LazyProc's Addr method.
|
|
type LazyDLL struct {
|
|
Name string
|
|
|
|
// System determines whether the DLL must be loaded from the
|
|
// Windows System directory, bypassing the normal DLL search
|
|
// path.
|
|
System bool
|
|
|
|
mu sync.Mutex
|
|
dll *DLL // non nil once DLL is loaded
|
|
}
|
|
|
|
// Load loads DLL file d.Name into memory. It returns an error if fails.
|
|
// Load will not try to load DLL, if it is already loaded into memory.
|
|
func (d *LazyDLL) Load() error {
|
|
// Non-racy version of:
|
|
// if d.dll != nil {
|
|
if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&d.dll))) != nil {
|
|
return nil
|
|
}
|
|
d.mu.Lock()
|
|
defer d.mu.Unlock()
|
|
if d.dll != nil {
|
|
return nil
|
|
}
|
|
|
|
// kernel32.dll is special, since it's where LoadLibraryEx comes from.
|
|
// The kernel already special-cases its name, so it's always
|
|
// loaded from system32.
|
|
var dll *DLL
|
|
var err error
|
|
if d.Name == "kernel32.dll" {
|
|
dll, err = LoadDLL(d.Name)
|
|
} else {
|
|
dll, err = loadLibraryEx(d.Name, d.System)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Non-racy version of:
|
|
// d.dll = dll
|
|
atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.dll)), unsafe.Pointer(dll))
|
|
return nil
|
|
}
|
|
|
|
// mustLoad is like Load but panics if search fails.
|
|
func (d *LazyDLL) mustLoad() {
|
|
e := d.Load()
|
|
if e != nil {
|
|
panic(e)
|
|
}
|
|
}
|
|
|
|
// Handle returns d's module handle.
|
|
func (d *LazyDLL) Handle() uintptr {
|
|
d.mustLoad()
|
|
return uintptr(d.dll.Handle)
|
|
}
|
|
|
|
// NewProc returns a LazyProc for accessing the named procedure in the DLL d.
|
|
func (d *LazyDLL) NewProc(name string) *LazyProc {
|
|
return &LazyProc{l: d, Name: name}
|
|
}
|
|
|
|
// NewLazyDLL creates new LazyDLL associated with DLL file.
|
|
func NewLazyDLL(name string) *LazyDLL {
|
|
return &LazyDLL{Name: name}
|
|
}
|
|
|
|
// NewLazySystemDLL is like NewLazyDLL, but will only
|
|
// search Windows System directory for the DLL if name is
|
|
// a base name (like "advapi32.dll").
|
|
func NewLazySystemDLL(name string) *LazyDLL {
|
|
return &LazyDLL{Name: name, System: true}
|
|
}
|
|
|
|
// A LazyProc implements access to a procedure inside a LazyDLL.
|
|
// It delays the lookup until the Addr method is called.
|
|
type LazyProc struct {
|
|
Name string
|
|
|
|
mu sync.Mutex
|
|
l *LazyDLL
|
|
proc *Proc
|
|
}
|
|
|
|
// Find searches DLL for procedure named p.Name. It returns
|
|
// an error if search fails. Find will not search procedure,
|
|
// if it is already found and loaded into memory.
|
|
func (p *LazyProc) Find() error {
|
|
// Non-racy version of:
|
|
// if p.proc == nil {
|
|
if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&p.proc))) == nil {
|
|
p.mu.Lock()
|
|
defer p.mu.Unlock()
|
|
if p.proc == nil {
|
|
e := p.l.Load()
|
|
if e != nil {
|
|
return e
|
|
}
|
|
proc, e := p.l.dll.FindProc(p.Name)
|
|
if e != nil {
|
|
return e
|
|
}
|
|
// Non-racy version of:
|
|
// p.proc = proc
|
|
atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&p.proc)), unsafe.Pointer(proc))
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// mustFind is like Find but panics if search fails.
|
|
func (p *LazyProc) mustFind() {
|
|
e := p.Find()
|
|
if e != nil {
|
|
panic(e)
|
|
}
|
|
}
|
|
|
|
// Addr returns the address of the procedure represented by p.
|
|
// The return value can be passed to Syscall to run the procedure.
|
|
// It will panic if the procedure cannot be found.
|
|
func (p *LazyProc) Addr() uintptr {
|
|
p.mustFind()
|
|
return p.proc.Addr()
|
|
}
|
|
|
|
//go:uintptrescapes
|
|
|
|
// Call executes procedure p with arguments a. It will panic, if more than 15 arguments
|
|
// are supplied. It will also panic if the procedure cannot be found.
|
|
//
|
|
// The returned error is always non-nil, constructed from the result of GetLastError.
|
|
// Callers must inspect the primary return value to decide whether an error occurred
|
|
// (according to the semantics of the specific function being called) before consulting
|
|
// the error. The error will be guaranteed to contain windows.Errno.
|
|
func (p *LazyProc) Call(a ...uintptr) (r1, r2 uintptr, lastErr error) {
|
|
p.mustFind()
|
|
return p.proc.Call(a...)
|
|
}
|
|
|
|
var canDoSearchSystem32Once struct {
|
|
sync.Once
|
|
v bool
|
|
}
|
|
|
|
func initCanDoSearchSystem32() {
|
|
// https://msdn.microsoft.com/en-us/library/ms684179(v=vs.85).aspx says:
|
|
// "Windows 7, Windows Server 2008 R2, Windows Vista, and Windows
|
|
// Server 2008: The LOAD_LIBRARY_SEARCH_* flags are available on
|
|
// systems that have KB2533623 installed. To determine whether the
|
|
// flags are available, use GetProcAddress to get the address of the
|
|
// AddDllDirectory, RemoveDllDirectory, or SetDefaultDllDirectories
|
|
// function. If GetProcAddress succeeds, the LOAD_LIBRARY_SEARCH_*
|
|
// flags can be used with LoadLibraryEx."
|
|
canDoSearchSystem32Once.v = (modkernel32.NewProc("AddDllDirectory").Find() == nil)
|
|
}
|
|
|
|
func canDoSearchSystem32() bool {
|
|
canDoSearchSystem32Once.Do(initCanDoSearchSystem32)
|
|
return canDoSearchSystem32Once.v
|
|
}
|
|
|
|
func isBaseName(name string) bool {
|
|
for _, c := range name {
|
|
if c == ':' || c == '/' || c == '\\' {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// loadLibraryEx wraps the Windows LoadLibraryEx function.
|
|
//
|
|
// See https://msdn.microsoft.com/en-us/library/windows/desktop/ms684179(v=vs.85).aspx
|
|
//
|
|
// If name is not an absolute path, LoadLibraryEx searches for the DLL
|
|
// in a variety of automatic locations unless constrained by flags.
|
|
// See: https://msdn.microsoft.com/en-us/library/ff919712%28VS.85%29.aspx
|
|
func loadLibraryEx(name string, system bool) (*DLL, error) {
|
|
loadDLL := name
|
|
var flags uintptr
|
|
if system {
|
|
if canDoSearchSystem32() {
|
|
const LOAD_LIBRARY_SEARCH_SYSTEM32 = 0x00000800
|
|
flags = LOAD_LIBRARY_SEARCH_SYSTEM32
|
|
} else if isBaseName(name) {
|
|
// WindowsXP or unpatched Windows machine
|
|
// trying to load "foo.dll" out of the system
|
|
// folder, but LoadLibraryEx doesn't support
|
|
// that yet on their system, so emulate it.
|
|
systemdir, err := GetSystemDirectory()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
loadDLL = systemdir + "\\" + name
|
|
}
|
|
}
|
|
h, err := LoadLibraryEx(loadDLL, 0, flags)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &DLL{Name: name, Handle: h}, nil
|
|
}
|
|
|
|
type errString string
|
|
|
|
func (s errString) Error() string { return string(s) }
|