83 lines
2 KiB
Go
83 lines
2 KiB
Go
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//go:build windows
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// +build windows
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package wguser
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import (
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"net"
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"strings"
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"time"
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"golang.org/x/sys/windows"
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"golang.zx2c4.com/wireguard/ipc/namedpipe"
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)
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// Expected prefixes when dealing with named pipes.
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const (
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pipePrefix = `\\.\pipe\`
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wgPrefix = `ProtectedPrefix\Administrators\WireGuard\`
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)
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// dial is the default implementation of Client.dial.
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func dial(device string) (net.Conn, error) {
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localSystem, err := windows.CreateWellKnownSid(windows.WinLocalSystemSid)
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if err != nil {
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return nil, err
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}
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return (&namedpipe.DialConfig{
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ExpectedOwner: localSystem,
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}).DialTimeout(device, time.Duration(0))
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}
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// find is the default implementation of Client.find.
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func find() ([]string, error) {
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return findNamedPipes(wgPrefix)
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}
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// findNamedPipes looks for Windows named pipes that match the specified
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// search string prefix.
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func findNamedPipes(search string) ([]string, error) {
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var (
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pipes []string
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data windows.Win32finddata
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)
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// Thanks @zx2c4 for the tips on the appropriate Windows APIs here:
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// https://א.cc/dHGpnhxX/c.
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h, err := windows.FindFirstFile(
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// Append * to find all named pipes.
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windows.StringToUTF16Ptr(pipePrefix+"*"),
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&data,
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)
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if err != nil {
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return nil, err
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}
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// FindClose is used to close file search handles instead of the typical
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// CloseHandle used elsewhere, see:
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// https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-findclose.
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defer windows.FindClose(h)
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// Check the first file's name for a match, but also keep searching for
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// WireGuard named pipes until no more files can be iterated.
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for {
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name := windows.UTF16ToString(data.FileName[:])
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if strings.HasPrefix(name, search) {
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// Concatenate strings directly as filepath.Join appears to break the
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// named pipe prefix convention.
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pipes = append(pipes, pipePrefix+name)
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}
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if err := windows.FindNextFile(h, &data); err != nil {
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if err == windows.ERROR_NO_MORE_FILES {
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break
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}
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return nil, err
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}
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}
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return pipes, nil
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}
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