Add some comments, move AWDL functions to iOS-specific build tags

src/yggdrasil/mobile_ios.go

@@ -12,7 +12,14 @@ void Log(const char *text) {
 }
 */
 import "C"
-import "unsafe"
+import (
+	"encoding/hex"
+	"errors"
+	"unsafe"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
+)
 
 type MobileLogger struct {
 }
@@ -23,3 +30,72 @@ func (nsl MobileLogger) Write(p []byte) (n int, err error) {
 	C.Log(cstr)
 	return len(p), nil
 }
+
+func (c *Core) AWDLCreateInterface(boxPubKey string, sigPubKey string, name string) error {
+	fromAWDL := make(chan []byte, 32)
+	toAWDL := make(chan []byte, 32)
+
+	var boxPub crypto.BoxPubKey
+	var sigPub crypto.SigPubKey
+	boxPubHex, err := hex.DecodeString(boxPubKey)
+	if err != nil {
+		c.log.Println(err)
+		return err
+	}
+	sigPubHex, err := hex.DecodeString(sigPubKey)
+	if err != nil {
+		c.log.Println(err)
+		return err
+	}
+	copy(boxPub[:], boxPubHex)
+	copy(sigPub[:], sigPubHex)
+
+	if intf, err := c.awdl.create(fromAWDL, toAWDL, &boxPub, &sigPub, name); err == nil {
+		if intf != nil {
+			c.log.Println(err)
+			return err
+		} else {
+			c.log.Println("c.awdl.create didn't return an interface")
+			return errors.New("c.awdl.create didn't return an interface")
+		}
+	} else {
+		c.log.Println(err)
+		return err
+	}
+}
+
+func (c *Core) AWDLCreateInterfaceFromContext(context []byte, name string) error {
+	if len(context) < crypto.BoxPubKeyLen+crypto.SigPubKeyLen {
+		return errors.New("Not enough bytes in context")
+	}
+	boxPubKey := hex.EncodeToString(context[:crypto.BoxPubKeyLen])
+	sigPubKey := hex.EncodeToString(context[crypto.BoxPubKeyLen:])
+	return c.AWDLCreateInterface(boxPubKey, sigPubKey, name)
+}
+
+func (c *Core) AWDLShutdownInterface(name string) error {
+	return c.awdl.shutdown(name)
+}
+
+func (c *Core) AWDLRecvPacket(identity string) ([]byte, error) {
+	if intf := c.awdl.getInterface(identity); intf != nil {
+		return <-intf.toAWDL, nil
+	}
+	return nil, errors.New("AWDLRecvPacket identity not known: " + identity)
+}
+
+func (c *Core) AWDLSendPacket(identity string, buf []byte) error {
+	packet := append(util.GetBytes(), buf[:]...)
+	if intf := c.awdl.getInterface(identity); intf != nil {
+		intf.fromAWDL <- packet
+		return nil
+	}
+	return errors.New("AWDLSendPacket identity not known: " + identity)
+}
+
+func (c *Core) AWDLConnectionContext() []byte {
+	var context []byte
+	context = append(context, c.boxPub[:]...)
+	context = append(context, c.sigPub[:]...)
+	return context
+}