make configs settable

ipconfig.go

@@ -8,6 +8,22 @@ import (
 
 type IPConfigs []*IPConfig
 
+func (c *IPConfigs) Set(index int, ipc *IPConfig) {
+	l := len(*c)
+	if index >= l {
+		n := make(IPConfigs, index+1)
+		copy(n, *c)
+		n[index] = ipc
+		*c = n
+		return
+	}
+	if l == 0 {
+		*c = append(*c, ipc)
+		return
+	}
+	(*c)[index] = ipc
+}
+
 func (c IPConfigs) Get(index int) *IPConfig {
 	if len(c)-1 >= index {
 		return c[index]