From fbc5f62add6ea6227cd8d904b3e3791041b9983f Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Thu, 17 Aug 2023 14:08:03 +0100
Subject: [PATCH] Fix missing `setupFD` stubs

---
 src/tun/tun_bsd.go     | 6 ++++++
 src/tun/tun_linux.go   | 7 +++++++
 src/tun/tun_other.go   | 7 +++++++
 src/tun/tun_windows.go | 6 ++++++
 4 files changed, 26 insertions(+)

diff --git a/src/tun/tun_bsd.go b/src/tun/tun_bsd.go
index 9a8f70ce..3910ccef 100644
--- a/src/tun/tun_bsd.go
+++ b/src/tun/tun_bsd.go
@@ -5,6 +5,7 @@ package tun
 
 import (
 	"encoding/binary"
+	"fmt"
 	"os/exec"
 	"strconv"
 	"strings"
@@ -88,6 +89,11 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
 	return tun.setupAddress(addr)
 }
 
+// Configures the "utun" adapter from an existing file descriptor.
+func (tun *TunAdapter) setupFD(fd int32, addr string, mtu uint64) error {
+	return fmt.Errorf("setup via FD not supported on this platform")
+}
+
 func (tun *TunAdapter) setupAddress(addr string) error {
 	var sfd int
 	var err error
diff --git a/src/tun/tun_linux.go b/src/tun/tun_linux.go
index 1e42b7b8..16deb8e5 100644
--- a/src/tun/tun_linux.go
+++ b/src/tun/tun_linux.go
@@ -6,6 +6,8 @@ package tun
 // The linux platform specific tun parts
 
 import (
+	"fmt"
+
 	"github.com/vishvananda/netlink"
 	wgtun "golang.zx2c4.com/wireguard/tun"
 )
@@ -28,6 +30,11 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
 	return tun.setupAddress(addr)
 }
 
+// Configures the "utun" adapter from an existing file descriptor.
+func (tun *TunAdapter) setupFD(fd int32, addr string, mtu uint64) error {
+	return fmt.Errorf("setup via FD not supported on this platform")
+}
+
 // Configures the TUN adapter with the correct IPv6 address and MTU. Netlink
 // is used to do this, so there is not a hard requirement on "ip" or "ifconfig"
 // to exist on the system, but this will fail if Netlink is not present in the
diff --git a/src/tun/tun_other.go b/src/tun/tun_other.go
index c618d837..dd33708e 100644
--- a/src/tun/tun_other.go
+++ b/src/tun/tun_other.go
@@ -7,6 +7,8 @@ package tun
 // If your platform supports tun devices, you could try configuring it manually
 
 import (
+	"fmt"
+
 	wgtun "golang.zx2c4.com/wireguard/tun"
 )
 
@@ -25,6 +27,11 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
 	return tun.setupAddress(addr)
 }
 
+// Configures the "utun" adapter from an existing file descriptor.
+func (tun *TunAdapter) setupFD(fd int32, addr string, mtu uint64) error {
+	return fmt.Errorf("setup via FD not supported on this platform")
+}
+
 // We don't know how to set the IPv6 address on an unknown platform, therefore
 // write about it to stdout and don't try to do anything further.
 func (tun *TunAdapter) setupAddress(addr string) error {
diff --git a/src/tun/tun_windows.go b/src/tun/tun_windows.go
index c3e36596..2713f991 100644
--- a/src/tun/tun_windows.go
+++ b/src/tun/tun_windows.go
@@ -6,6 +6,7 @@ package tun
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"log"
 	"net"
 
@@ -50,6 +51,11 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
 	})
 }
 
+// Configures the "utun" adapter from an existing file descriptor.
+func (tun *TunAdapter) setupFD(fd int32, addr string, mtu uint64) error {
+	return fmt.Errorf("setup via FD not supported on this platform")
+}
+
 // Sets the MTU of the TUN adapter.
 func (tun *TunAdapter) setupMTU(mtu uint64) error {
 	if tun.iface == nil || tun.Name() == "" {