From 9e4d169208c83ddcb569aa4c69ddaafafa82b987 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Thu, 1 Mar 2018 13:37:05 +0000
Subject: [PATCH] Set interface IP and MTU on BSD

---
 src/yggdrasil/tun_bsd.go   | 69 +++++++++++++++++++++++++++++++++++---
 src/yggdrasil/tun_other.go |  7 +---
 2 files changed, 66 insertions(+), 10 deletions(-)

diff --git a/src/yggdrasil/tun_bsd.go b/src/yggdrasil/tun_bsd.go
index 4e3fa0c1..67e3b6f0 100644
--- a/src/yggdrasil/tun_bsd.go
+++ b/src/yggdrasil/tun_bsd.go
@@ -1,17 +1,60 @@
-// +build openbsd freebsd solaris
+// +build openbsd freebsd solaris netbsd dragonfly
 
 package yggdrasil
 
+import "fmt"
+import "os/exec"
+import "strings"
+
 import water "github.com/neilalexander/water"
 
 // This is to catch BSD platforms
 
+const TUNSIFINFO = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 91
+const TUNGIFINFO = (0x40000000) | ((4 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 92
+const SIOCAIFADDR_IN6 = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 27
+
+type in6_addrlifetime struct {
+	ia6t_expire    float64
+	ia6t_preferred float64
+	ia6t_vltime    uint32
+	ia6t_pltime    uint32
+}
+
+type sockaddr_in6 struct {
+	sin6_len      uint8
+	sin6_family   uint8
+	sin6_port     uint8
+	sin6_flowinfo uint32
+	sin6_addr     [8]uint16
+	sin6_scope_id uint32
+}
+
+type in6_aliasreq struct {
+	ifra_name       [16]byte
+	ifra_addr       sockaddr_in6
+	ifra_dstaddr    sockaddr_in6
+	ifra_prefixmask sockaddr_in6
+	ifra_flags      uint32
+	ifra_lifetime   in6_addrlifetime
+}
+
+type tuninfo struct {
+	tun_baudrate int
+	tun_mtu      int16
+	tun_type     uint8
+	tun_dummy    uint8
+}
+
 func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	var config water.Config
-	if iftapmode {
+	switch {
+	case iftapmode || ifname[:8] == "/dev/tap":
 		config = water.Config{DeviceType: water.TAP}
-	} else {
+	case !iftapmode || ifname[:8] == "/dev/tun":
 		config = water.Config{DeviceType: water.TUN}
+	default:
+		panic("TUN/TAP name must be in format /dev/tunX or /dev/tapX")
 	}
 	config.Name = ifname
 	iface, err := water.New(config)
@@ -24,6 +67,24 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 }
 
 func (tun *tunDevice) setupAddress(addr string) error {
-	tun.core.log.Println("Platform not supported, you must set the address of", tun.iface.Name(), "to", addr)
+	// Set address
+	cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
+	tun.core.log.Printf("ifconfig command: %v", strings.Join(cmd.Args, " "))
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		tun.core.log.Printf("ipconfig failed: %v.", err)
+		tun.core.log.Println(string(output))
+		return err
+	}
+	// Set MTU and bring device up
+	cmd = exec.Command("ifconfig", tun.iface.Name(), "mtu", fmt.Sprintf("%d", tun.mtu), "up")
+	tun.core.log.Printf("ifconfig command: %v", strings.Join(cmd.Args, " "))
+	output, err = cmd.CombinedOutput()
+	if err != nil {
+		tun.core.log.Printf("ipconfig failed: %v.", err)
+		tun.core.log.Println(string(output))
+		return err
+	}
+
 	return nil
 }
diff --git a/src/yggdrasil/tun_other.go b/src/yggdrasil/tun_other.go
index 147e55ad..06dc2158 100644
--- a/src/yggdrasil/tun_other.go
+++ b/src/yggdrasil/tun_other.go
@@ -1,9 +1,4 @@
-// +build !linux
-// +build !darwin
-// +build !windows
-// +build !openbsd
-// +build !freebsd
-// +build !solaris
+// +build !linux,!darwin,!windows,!openbsd,!freebsd,!solaris,!netbsd,!dragonfly
 
 package yggdrasil