wgengine: fix build on linux/freebsd/openbsd/windows

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>

wgengine/ifconfig_windows.go

@@ -237,7 +237,7 @@ func setFirewall(ifcGUID *windows.GUID) (bool, error) {
 	return false, nil
 }
 
-func ConfigureInterface(m *wgcfg.Config, tun *tun.NativeTun, dns []net.IP, dnsDomains []string) error {
+func ConfigureInterface(m *wgcfg.Config, tun *tun.NativeTun, dns []wgcfg.IP, dnsDomains []string) error {
 	const mtu = 0
 	guid := tun.GUID()
 	log.Printf("wintun GUID is %v\n", guid)
@@ -268,8 +268,8 @@ func ConfigureInterface(m *wgcfg.Config, tun *tun.NativeTun, dns []net.IP, dnsDo
 	routes := []winipcfg.RouteData{}
 	var firstGateway4 *net.IP
 	var firstGateway6 *net.IP
-	addresses := make([]*net.IPNet, len(m.Interface.Addresses))
-	for i, addr := range m.Interface.Addresses {
+	addresses := make([]*net.IPNet, len(m.Addresses))
+	for i, addr := range m.Addresses {
 		ipnet := addr.IPNet()
 		addresses[i] = ipnet
 		gateway := ipnet.IP
@@ -361,7 +361,11 @@ func ConfigureInterface(m *wgcfg.Config, tun *tun.NativeTun, dns []net.IP, dnsDo
 		errAcc = err
 	}
 
-	err = iface.SetDNS(dns)
+	var dnsIPs []net.IP
+	for _, ip := range dns {
+		dnsIPs = append(dnsIPs, ip.IP())
+	}
+	err = iface.SetDNS(dnsIPs)
 	if err != nil && errAcc == nil {
 		log.Printf("setdns: %v\n", err)
 		errAcc = err

wgengine/router_freebsd.go

@@ -7,7 +7,6 @@ package wgengine
 import (
 	"fmt"
 	"log"
-	"net"
 	"os/exec"
 
 	"github.com/tailscale/wireguard-go/device"
@@ -154,5 +153,5 @@ func (r *freebsdRouter) Close() error {
 
 // TODO(mbaillie): these are no-ops for now. They could re-use the Linux funcs
 // (sans systemd parts), but I note Linux DNS is disabled(?) so leaving for now.
-func (r *freebsdRouter) replaceResolvConf(_ []net.IP, _ []string) error { return nil }
+func (r *freebsdRouter) replaceResolvConf(_ []wgcfg.IP, _ []string) error { return nil }
 func (r *freebsdRouter) restoreResolvConf() error                         { return nil }

wgengine/router_linux.go

@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"log"
-	"net"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -177,7 +176,7 @@ const (
 	resolvConf = "/etc/resolv.conf"
 )
 
-func (r *linuxRouter) replaceResolvConf(servers []net.IP, domains []string) error {
+func (r *linuxRouter) replaceResolvConf(servers []wgcfg.IP, domains []string) error {
 	if len(servers) == 0 {
 		return r.restoreResolvConf()
 	}

wgengine/router_openbsd.go

@@ -7,7 +7,6 @@ package wgengine
 import (
 	"fmt"
 	"log"
-	"net"
 	"os/exec"
 
 	"github.com/tailscale/wireguard-go/device"
@@ -175,5 +174,5 @@ func (r *openbsdRouter) Close() error {
 
 // TODO(mbaillie): these are no-ops for now. They could re-use the Linux funcs
 // (sans systemd parts), but I note Linux DNS is disabled(?) so leaving for now.
-func (r *openbsdRouter) replaceResolvConf(_ []net.IP, _ []string) error { return nil }
+func (r *openbsdRouter) replaceResolvConf(_ []wgcfg.IP, _ []string) error { return nil }
 func (r *openbsdRouter) restoreResolvConf() error                         { return nil }