repurpose the useless cmd application nobody used into a place to put the i2pkeys library outside of both the SAM libraries

I2PAddr_test.go

@@ -19,3 +19,15 @@ func Test_Basic(t *testing.T) {
 	}
 	fmt.Println(keys.String())
 }
+
+func Test_Basic_Lookup(t *testing.T) {
+	fmt.Println("Test_Basic")
+	fmt.Println("\tAttaching to SAM at " + yoursam)
+	keys, err := Lookup("idk.i2p")
+	if err != nil {
+		fmt.Println(err.Error())
+		t.Fail()
+		return
+	}
+	fmt.Println(keys.String())
+}

Lookup.go

@@ -1,14 +1,47 @@
 package i2pkeys
 
-import "net"
+import (
+	"fmt"
+	"net"
+	"strings"
+)
 
-type SimpleLookup struct {
+func Lookup(addr string) (*I2PAddr, error) {
+	conn, err := net.Dial("tcp", "127.0.0.1:7656")
+	if err != nil {
+		return nil, err
 	}
-
-func Lookup(i2paddr string) net.Addr {
-	return nil
+	defer conn.Close()
+	_, err = conn.Write([]byte("HELLO VERSION MIN=3.1 MAX=3.1\n"))
+	if err != nil {
+		return nil, err
 	}
-
-func LookupI2P(i2paddr string) *I2PAddr {
-	return nil
+	buf := make([]byte, 4096)
+	n, err := conn.Read(buf)
+	if err != nil {
+		return nil, err
+	}
+	if n < 1 {
+		return nil, fmt.Errorf("no data received")
+	}
+	if strings.Contains(string(buf[:n]), "RESULT=OK") {
+		_, err = conn.Write([]byte(fmt.Sprintf("NAMING LOOKUP NAME=%s\n", addr)))
+		if err != nil {
+			return nil, err
+		}
+		n, err = conn.Read(buf)
+		if err != nil {
+			return nil, err
+		}
+		if n < 1 {
+			return nil, fmt.Errorf("no destination data received")
+		}
+		value := strings.Split(string(buf[:n]), "VALUE=")[1]
+		addr, err := NewI2PAddrFromString(value)
+		if err != nil {
+			return nil, err
+		}
+		return &addr, err
+	}
+	return nil, fmt.Errorf("no result received")
 }