Add /48 subnet targeting for IPv6 ip targeting

Also add IP targeting tests for IPv6, closes #55

targeting.go

@@ -18,6 +18,12 @@ const (
 	TargetIP
 )
 
+var cidr48Mask net.IPMask
+
+func init() {
+	cidr48Mask = net.CIDRMask(48, 128)
+}
+
 func (t TargetOptions) GetTargets(ip net.IP) ([]string, int) {
 
 	targets := make([]string, 0)
@@ -45,6 +51,10 @@ func (t TargetOptions) GetTargets(ip net.IP) ([]string, int) {
 				ip4[3] = 0
 				targets = append(targets, "["+ip4.String()+"]")
 			}
+		} else {
+			// v6 address, also target the /48 address
+			ip48 := ip.Mask(cidr48Mask)
+			targets = append(targets, "["+ip48.String()+"]")
 		}
 	}
 

targeting_test.go

@@ -62,4 +62,10 @@ func (s *TargetingSuite) TestGetTargets(c *C) {
 	tgt, _ = parseTargets("@ continent regiongroup country region asn ip")
 	targets, _ = tgt.GetTargets(ip)
 	c.Check(targets, DeepEquals, []string{"[207.171.1.1]", "[207.171.1.0]", "as7012", "us-ca", "us-west", "us", "north-america", "@"})
+
+	ip = net.ParseIP("2607:f238:2:0::ff:4")
+	tgt, _ = parseTargets("ip")
+	targets, _ = tgt.GetTargets(ip)
+	c.Check(targets, DeepEquals, []string{"[2607:f238:2::ff:4]", "[2607:f238:2::]"})
+
 }