60b3766b89
We let people loading this from resources opt in via:
go build -tags load_wintun_from_rsrc
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
// +build load_wintun_from_rsrc
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/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
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*/
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package wintun
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import (
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"fmt"
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"sync"
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"sync/atomic"
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"unsafe"
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"golang.org/x/sys/windows"
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"golang.zx2c4.com/wireguard/tun/wintun/memmod"
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"golang.zx2c4.com/wireguard/tun/wintun/resource"
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)
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type lazyDLL struct {
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Name string
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mu sync.Mutex
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module *memmod.Module
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}
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func (d *lazyDLL) Load() error {
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if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&d.module))) != nil {
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return nil
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}
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d.mu.Lock()
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defer d.mu.Unlock()
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if d.module != nil {
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return nil
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}
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const ourModule windows.Handle = 0
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resInfo, err := resource.FindByName(ourModule, d.Name, resource.RT_RCDATA)
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if err != nil {
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return fmt.Errorf("Unable to find \"%v\" RCDATA resource: %w", d.Name, err)
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}
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data, err := resource.Load(ourModule, resInfo)
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if err != nil {
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return fmt.Errorf("Unable to load resource: %w", err)
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}
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module, err := memmod.LoadLibrary(data)
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if err != nil {
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return fmt.Errorf("Unable to load library: %w", err)
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}
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atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.module)), unsafe.Pointer(module))
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return nil
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}
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func (p *lazyProc) nameToAddr() (uintptr, error) {
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return p.dll.module.ProcAddressByName(p.Name)
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}
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