Create interface for socket info structs, fix caching bug

From PR Review https://github.com/safing/portmaster/pull/72

network/socket/socket.go

@@ -29,3 +29,35 @@ type Address struct {
 	IP   net.IP
 	Port uint16
 }
+
+// Info is a generic interface to both ConnectionInfo and BindInfo.
+type Info interface {
+	GetPID() int
+	SetPID(int)
+	GetUID() int
+	GetInode() int
+}
+
+// GetPID returns the PID.
+func (i *ConnectionInfo) GetPID() int { return i.PID }
+
+// SetPID sets the PID to the given value.
+func (i *ConnectionInfo) SetPID(pid int) { i.PID = pid }
+
+// GetUID returns the UID.
+func (i *ConnectionInfo) GetUID() int { return i.UID }
+
+// GetInode returns the Inode.
+func (i *ConnectionInfo) GetInode() int { return i.Inode }
+
+// GetPID returns the PID.
+func (i *BindInfo) GetPID() int { return i.PID }
+
+// SetPID sets the PID to the given value.
+func (i *BindInfo) SetPID(pid int) { i.PID = pid }
+
+// GetUID returns the UID.
+func (i *BindInfo) GetUID() int { return i.UID }
+
+// GetInode returns the Inode.
+func (i *BindInfo) GetInode() int { return i.Inode }