Add documentation to TUN library

Author: alecbcs

cli/down.go

@@ -52,7 +52,7 @@ func DownRun(r *cmd.Root, c *cmd.Sub) {
 
 	// Different types of systems may need the tun devices destroyed first or
 	// the process to exit first don't worry as long as one of these two has
-	// suceeded.
+	// succeeded.
 	if err0 != nil && err1 != nil {
 		checkErr(err0)
 		checkErr(err1)

cli/up.go

@@ -301,6 +301,9 @@ func createDaemon(cfg *config.Config) error {
 			fmt.Println(line.Text)
 			if strings.HasPrefix(line.Text, "[+] Connection to") {
 				numConnected++
+				if numConnected >= len(cfg.Peers) {
+					break
+				}
 			}
 		}
 		out <- numConnected

tun/options.go

@@ -1,19 +1,26 @@
 package tun
 
+// Option defines a TUN device modifier option.
 type Option func(tun *TUN) error
 
+// Address sets the local address and subnet for an interface.
+// On MacOS devices use this function to set the Src Address
+// for an interface and use DestAddress to set the destination ip.
 func Address(address string) Option {
 	return func(tun *TUN) error {
 		return tun.setAddress(address)
 	}
 }
 
+// MTU sets the Maximum Transmission Unit size for an interface.
 func MTU(mtu int) Option {
 	return func(tun *TUN) error {
 		return tun.setMTU(mtu)
 	}
 }
 
+// DestAddress sets the destination address for a point-to-point interface.
+// Only use this option on MacOS devices.
 func DestAddress(address string) Option {
 	return func(tun *TUN) error {
 		return tun.setDestAddress(address)

tun/tun.go

@@ -2,13 +2,17 @@ package tun
 
 import "github.com/songgao/water"
 
+// TUN is a struct containing the fields necessary
+// to configure a system TUN device. Access the
+// internal TUN device through TUN.Iface
 type TUN struct {
 	Iface *water.Interface
 	MTU   int
 	Src   string
 	Dst   string
 }
 
+// Apply configures the specified options for a TUN device.
 func (t *TUN) Apply(opts ...Option) error {
 	for _, opt := range opts {
 		if opt == nil {