Move network/environment to netenv

netenv/environment.go

@@ -0,0 +1,41 @@
+package netenv
+
+import (
+	"net"
+	"sync"
+	"time"
+)
+
+// TODO: find a good way to identify a network
+// best options until now:
+// MAC of gateway
+// domain parameter of dhcp
+
+// TODO: get dhcp servers on windows:
+// windows: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365917
+// this info might already be included in the interfaces api provided by golang!
+
+const (
+	gatewaysRecheck    = 2 * time.Second
+	nameserversRecheck = 2 * time.Second
+)
+
+var (
+	// interfaces        = make(map[*net.IP]net.Flags)
+	// interfacesLock    sync.Mutex
+	// interfacesExpires = time.Now()
+
+	gateways        = make([]*net.IP, 0)
+	gatewaysLock    sync.Mutex
+	gatewaysExpires = time.Now()
+
+	nameservers        = make([]Nameserver, 0)
+	nameserversLock    sync.Mutex
+	nameserversExpires = time.Now()
+)
+
+// Nameserver describes a system assigned namserver.
+type Nameserver struct {
+	IP     net.IP
+	Search []string
+}