太难了

tcpip/tcpip.go

@@ -1,5 +1,12 @@
 package tcpip
 
+import (
+	"fmt"
+	"log"
+	"strconv"
+	"strings"
+)
+
 type Error struct {
 	msg         string
 	ignoreStats bool
@@ -23,8 +30,8 @@ var (
 	ErrBadLinkEndPoint       = &Error{msg: "bad link layer endpoint"}
 	ErrAlreadyBound          = &Error{msg: "endpoint already bound", ignoreStats: true}
 	ErrInvalidEndpointState  = &Error{msg: "endpoint is in invalid state"}
-	ErrAlreadConnecting      = &Error{msg: "endpoint is already connecting", ignoreStats: true}
-	ErrAlreadConnected       = &Error{msg: "endpoint is already connected", ignoreStats: true}
+	ErrAlreadyConnecting     = &Error{msg: "endpoint is already connecting", ignoreStats: true}
+	ErrAlreadyConnected      = &Error{msg: "endpoint is already connected", ignoreStats: true}
 	ErrNoPortAvailable       = &Error{msg: "no port are available"}
 	ErrPortInUse             = &Error{msg: "port is in use"}
 	ErrBadLocalAddress       = &Error{msg: "bad local address"}
@@ -48,3 +55,46 @@ var (
 	ErrMessageTooLong        = &Error{msg: "message too long"}
 	ErrNoBufferSpace         = &Error{msg: "no buffer space available"}
 )
+
+type LinkAddress string
+
+func (a LinkAddress) String() string {
+	switch len(a) {
+	case 6:
+		// MAC地址的格式 6位 4bit的十六进制数
+		return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", a[0], a[1], a[2], a[3], a[4], a[5])
+	default:
+		return fmt.Sprintf("%x", []byte(a))
+	}
+}
+
+// aa:bb:cc:dd:ee:ff aa-bb-cc-dd-ee-ff
+func ParseMACAddress(s string) (LinkAddress, error) {
+	parts := strings.FieldsFunc(s, func(c rune) bool {
+		return c == ':' || c == '-'
+	})
+
+	log.Println(parts)
+
+	if len(parts) != 6 {
+		return "", fmt.Errorf("inconsistent parts: %s", s)
+	}
+	addr := make([]byte, 0, len(parts))
+	for _, part := range parts {
+		u, err := strconv.ParseUint(part, 16, 8)
+		if err != nil {
+			return "", fmt.Errorf("invalid hex digits: %s", s)
+		}
+		addr = append(addr, byte(u))
+	}
+	return LinkAddress(addr), nil
+
+}
+
+type NetworkProtocolNumber uint32
+type Address string
+
+type ProtocolAddr struct {
+	Protocol NetworkProtocolNumber
+	Address  Address
+}