Handle IPv6 on Linux (#2)

Author: gmlewis

dns.go

@@ -38,7 +38,7 @@ func Resolve(name string, defaultPort int) ([]net.TCPAddr, error) {
 	}
 
 	// The hostname might not be there (if it's an address)
-	if url.Hostname() != "" {
+	if url.Hostname() != "" && url.Hostname() != "::" {
 		name = url.Hostname()
 	}
 

go.mod

@@ -1 +1,5 @@
 module github.com/emitter-io/address
+
+go 1.16
+
+require github.com/stretchr/testify v1.7.0

go.sum

@@ -0,0 +1,11 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

ipaddr.go

@@ -30,24 +30,40 @@ func Parse(addr string, defaultPort int) (*net.TCPAddr, error) {
 	// Convenience: set private address
 	if strings.Contains(addr, "private") {
 		private := GetPrivateOrDefault(Loopback)
-		addr = strings.Replace(addr, "private", private.String(), 1)
+		if private.IP.To4() == nil && strings.Contains(addr, ":") {
+			addr = strings.Replace(addr, "private", fmt.Sprintf("[%v]", private.String()), 1)
+		} else {
+			addr = strings.Replace(addr, "private", private.String(), 1)
+		}
 	}
 
 	// Convenience: set public address
 	if strings.Contains(addr, "external") {
 		external := GetExternalOrDefault(Loopback)
-		addr = strings.Replace(addr, "external", external.String(), 1)
+		if external.IP.To4() == nil && strings.Contains(addr, ":") {
+			addr = strings.Replace(addr, "external", fmt.Sprintf("[%v]", external.String()), 1)
+		} else {
+			addr = strings.Replace(addr, "external", external.String(), 1)
+		}
 	}
 
 	// Convenience: set public address
 	if strings.Contains(addr, "public") {
 		public := GetPublicOrDefault(Loopback)
-		addr = strings.Replace(addr, "public", public.String(), 1)
+		if public.IP.To4() == nil && strings.Contains(addr, ":") {
+			addr = strings.Replace(addr, "public", fmt.Sprintf("[%v]", public.String()), 1)
+		} else {
+			addr = strings.Replace(addr, "public", public.String(), 1)
+		}
 	}
 
 	// If we have only an IP address, use the default port
 	if ip := net.ParseIP(addr); ip != nil {
-		addr = fmt.Sprintf("%s:%d", ip, defaultPort)
+		if ip != nil && ip.To4() == nil {
+			addr = fmt.Sprintf("[%s]:%d", ip, defaultPort)
+		} else {
+			addr = fmt.Sprintf("%s:%d", ip, defaultPort)
+		}
 	}
 
 	// Resolve the address