add registry base interface, mdns, noop implementations, add resolver, client

utils/addr/addr.go

@@ -0,0 +1,167 @@
+package addr
+
+import (
+	"fmt"
+	"net"
+)
+
+var (
+	privateBlocks []*net.IPNet
+)
+
+func init() {
+	for _, b := range []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "100.64.0.0/10", "fd00::/8"} {
+		if _, block, err := net.ParseCIDR(b); err == nil {
+			privateBlocks = append(privateBlocks, block)
+		}
+	}
+}
+
+func isPrivateIP(ipAddr string) bool {
+	ip := net.ParseIP(ipAddr)
+	for _, priv := range privateBlocks {
+		if priv.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// IsLocal tells us whether an ip is local
+func IsLocal(addr string) bool {
+	// extract the host
+	host, _, err := net.SplitHostPort(addr)
+	if err == nil {
+		addr = host
+	}
+
+	// check if its localhost
+	if addr == "localhost" {
+		return true
+	}
+
+	// check against all local ips
+	for _, ip := range IPs() {
+		if addr == ip {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Extract returns a real ip
+func Extract(addr string) (string, error) {
+	// if addr specified then its returned
+	if len(addr) > 0 && (addr != "0.0.0.0" && addr != "[::]" && addr != "::") {
+		return addr, nil
+	}
+
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return "", fmt.Errorf("Failed to get interfaces! Err: %v", err)
+	}
+
+	//nolint:prealloc
+	var addrs []net.Addr
+	var loAddrs []net.Addr
+	for _, iface := range ifaces {
+		ifaceAddrs, err := iface.Addrs()
+		if err != nil {
+			// ignore error, interface can disappear from system
+			continue
+		}
+		if iface.Flags&net.FlagLoopback != 0 {
+			loAddrs = append(loAddrs, ifaceAddrs...)
+			continue
+		}
+		addrs = append(addrs, ifaceAddrs...)
+	}
+	addrs = append(addrs, loAddrs...)
+
+	var ipAddr string
+	var publicIP string
+
+	for _, rawAddr := range addrs {
+		var ip net.IP
+		switch addr := rawAddr.(type) {
+		case *net.IPAddr:
+			ip = addr.IP
+		case *net.IPNet:
+			ip = addr.IP
+		default:
+			continue
+		}
+
+		if !isPrivateIP(ip.String()) {
+			publicIP = ip.String()
+			continue
+		}
+
+		ipAddr = ip.String()
+		break
+	}
+
+	// return private ip
+	if len(ipAddr) > 0 {
+		a := net.ParseIP(ipAddr)
+		if a == nil {
+			return "", fmt.Errorf("ip addr %s is invalid", ipAddr)
+		}
+		return a.String(), nil
+	}
+
+	// return public or virtual ip
+	if len(publicIP) > 0 {
+		a := net.ParseIP(publicIP)
+		if a == nil {
+			return "", fmt.Errorf("ip addr %s is invalid", publicIP)
+		}
+		return a.String(), nil
+	}
+
+	return "", fmt.Errorf("No IP address found, and explicit IP not provided")
+}
+
+// IPs returns all known ips
+func IPs() []string {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil
+	}
+
+	var ipAddrs []string
+
+	for _, i := range ifaces {
+		addrs, err := i.Addrs()
+		if err != nil {
+			continue
+		}
+
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+
+			if ip == nil {
+				continue
+			}
+
+			// dont skip ipv6 addrs
+			/*
+				ip = ip.To4()
+				if ip == nil {
+					continue
+				}
+			*/
+
+			ipAddrs = append(ipAddrs, ip.String())
+		}
+	}
+
+	return ipAddrs
+}

utils/addr/addr_test.go

@@ -0,0 +1,58 @@
+package addr
+
+import (
+	"net"
+	"testing"
+)
+
+func TestIsLocal(t *testing.T) {
+	testData := []struct {
+		addr   string
+		expect bool
+	}{
+		{"localhost", true},
+		{"localhost:8080", true},
+		{"127.0.0.1", true},
+		{"127.0.0.1:1001", true},
+		{"80.1.1.1", false},
+	}
+
+	for _, d := range testData {
+		res := IsLocal(d.addr)
+		if res != d.expect {
+			t.Fatalf("expected %t got %t", d.expect, res)
+		}
+	}
+}
+
+func TestExtractor(t *testing.T) {
+	testData := []struct {
+		addr   string
+		expect string
+		parse  bool
+	}{
+		{"127.0.0.1", "127.0.0.1", false},
+		{"10.0.0.1", "10.0.0.1", false},
+		{"", "", true},
+		{"0.0.0.0", "", true},
+		{"[::]", "", true},
+	}
+
+	for _, d := range testData {
+		addr, err := Extract(d.addr)
+		if err != nil {
+			t.Errorf("Unexpected error %v", err)
+		}
+
+		if d.parse {
+			ip := net.ParseIP(addr)
+			if ip == nil {
+				t.Error("Unexpected nil IP")
+			}
+
+		} else if addr != d.expect {
+			t.Errorf("Expected %s got %s", d.expect, addr)
+		}
+	}
+
+}