tailscale/net/tsdial/peerapi_macios_ext.go

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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file's built on iOS and on two of three macOS build variants:
// the two GUI variants that both use Extensions (Network Extension
// and System Extension). It's not used on tailscaled-on-macOS.
//go:build ts_macext && (darwin || ios)
// +build ts_macext
// +build darwin ios
package tsdial
import (
"errors"
"net"
"syscall"
"tailscale.com/net/netns"
)
func init() {
peerDialControlFunc = peerDialControlFuncNetworkExtension
}
func peerDialControlFuncNetworkExtension(d *Dialer) func(network, address string, c syscall.RawConn) error {
d.mu.Lock()
defer d.mu.Unlock()
index := -1
if x, ok := d.interfaceIndexLocked(d.tunName); ok {
index = x
}
var lc net.ListenConfig
netns.SetListenConfigInterfaceIndex(&lc, index)
return func(network, address string, c syscall.RawConn) error {
if index == -1 {
return errors.New("failed to find TUN interface to bind to")
}
return lc.Control(network, address, c)
}
}