Code to parse socket addresses

tools/utils/sockets.go

@@ -0,0 +1,46 @@
+package utils
+
+import (
+	"fmt"
+	"github.com/seancfoley/ipaddress-go/ipaddr"
+	"runtime"
+	"strings"
+)
+
+func Cut(s string, sep string) (string, string, bool) {
+	if i := strings.Index(s, sep); i >= 0 {
+		return s[:i], s[i+len(sep):], true
+	}
+	return s, "", false
+}
+
+func ParseSocketAddress(spec string) (network string, addr string, err error) {
+	network, addr, found := Cut(spec, ":")
+	if !found {
+		err = fmt.Errorf("Invalid socket address: %s", spec)
+		return
+	}
+	if network == "unix" {
+		if strings.HasSuffix(addr, "@") && runtime.GOOS != "linux" {
+			err = fmt.Errorf("Abstract UNIX sockets are only supported on Linux. Cannot use: %s", spec)
+		}
+		return
+	}
+
+	if network == "tcp" || network == "tcp6" || network == "tcp4" {
+		host := ipaddr.NewHostName(addr)
+		if host.IsAddress() {
+			network = "ip"
+		}
+		return
+	}
+	if network == "ip" || network == "ip6" || network == "ip4" {
+		host := ipaddr.NewHostName(addr)
+		if !host.IsAddress() {
+			err = fmt.Errorf("Not a valid IP address: %#v. Cannot use: %s", addr, spec)
+		}
+		return
+	}
+	err = fmt.Errorf("Unknown network type: %#v in socket address: %s", network, spec)
+	return
+}