1 files changed, 36 insertions, 0 deletions
diff --git a/cmd/web/gethostip.go b/cmd/web/gethostip.go
new file mode 100644
index 0000000..3788ac1
--- /dev/null
+++ b/cmd/web/gethostip.go
@@ -0,0 +1,36 @@
+// +build dragonfly freebsd linux nacl netbsd openbsd solaris darwin
+
+package main
+
+// GetHostIP attempts to guess the IP address of the current machine and
+// returns that. Simply bails at the first non sane looking IP and returns it.
+// Not ideal but it should work well enough most of the time
+func GetHostIP() string {
+	iFaces, err := net.Interfaces()
+	if err != nil {
+		return "127.0.0.1"
+	}
+
+	// RFC 3927
+	_, ipv4LinkLocal, _ := net.ParseCIDR("169.254.0.0/16")
+
+	for _, iFace := range iFaces {
+		addrs, err := iFace.Addrs()
+		if err != nil {
+			continue
+		}
+
+		for _, a := range addrs {
+			n, ok := a.(*net.IPNet)
+			if !ok {
+				continue
+			}
+
+			if n.IP.To4() != nil && !n.IP.IsLoopback() && !ipv4LinkLocal.Contains(n.IP.To4()) {
+				return n.IP.String()
+			}
+		}
+	}
+
+	return "127.0.0.1"
+}