V2 alpha - initial version (#172)

Initial alpha codebase for version 2 of WireGuard Portal.
This version is considered unstable and incomplete (for example, no public REST API)! 
Use with care!


Fixes/Implements the following issues:
 - OAuth support #154, #1 
 - New Web UI with internationalisation support #98, #107, #89, #62
 - Postgres Support #49 
 - Improved Email handling #47, #119 
 - DNS Search Domain support #46 
 - Bugfixes #94, #48 

---------

Co-authored-by: Fabian Wechselberger <wechselbergerf@hotmail.com>

internal/lowlevel/netlink.go

@@ -0,0 +1,108 @@
+package lowlevel
+
+import (
+	"github.com/vishvananda/netlink"
+)
+
+// A NetlinkClient is a type which can control a netlink device.
+type NetlinkClient interface {
+	LinkAdd(link netlink.Link) error
+	LinkDel(link netlink.Link) error
+	LinkByName(name string) (netlink.Link, error)
+	LinkSetUp(link netlink.Link) error
+	LinkSetDown(link netlink.Link) error
+	LinkSetMTU(link netlink.Link, mtu int) error
+	AddrReplace(link netlink.Link, addr *netlink.Addr) error
+	AddrAdd(link netlink.Link, addr *netlink.Addr) error
+	AddrList(link netlink.Link) ([]netlink.Addr, error)
+	AddrDel(link netlink.Link, addr *netlink.Addr) error
+	RouteAdd(route *netlink.Route) error
+	RouteDel(route *netlink.Route) error
+	RouteReplace(route *netlink.Route) error
+	RouteList(link netlink.Link, family int) ([]netlink.Route, error)
+	RouteListFiltered(family int, filter *netlink.Route, filterMask uint64) ([]netlink.Route, error)
+	RuleAdd(rule *netlink.Rule) error
+	RuleDel(rule *netlink.Rule) error
+	RuleList(family int) ([]netlink.Rule, error)
+}
+
+type NetlinkManager struct {
+}
+
+func (n NetlinkManager) LinkAdd(link netlink.Link) error { return netlink.LinkAdd(link) }
+
+func (n NetlinkManager) LinkDel(link netlink.Link) error { return netlink.LinkDel(link) }
+
+func (n NetlinkManager) LinkByName(name string) (netlink.Link, error) {
+	return netlink.LinkByName(name)
+}
+
+func (n NetlinkManager) LinkSetUp(link netlink.Link) error { return netlink.LinkSetUp(link) }
+
+func (n NetlinkManager) LinkSetDown(link netlink.Link) error { return netlink.LinkSetDown(link) }
+
+func (n NetlinkManager) LinkSetMTU(link netlink.Link, mtu int) error {
+	return netlink.LinkSetMTU(link, mtu)
+}
+
+func (n NetlinkManager) AddrReplace(link netlink.Link, addr *netlink.Addr) error {
+	return netlink.AddrReplace(link, addr)
+}
+
+func (n NetlinkManager) AddrAdd(link netlink.Link, addr *netlink.Addr) error {
+	return netlink.AddrAdd(link, addr)
+}
+
+func (n NetlinkManager) AddrList(link netlink.Link) ([]netlink.Addr, error) {
+	listIPv4, err := netlink.AddrList(link, netlink.FAMILY_V4)
+	if err != nil {
+		return nil, err
+	}
+
+	listIPv6, err := netlink.AddrList(link, netlink.FAMILY_V6)
+	if err != nil {
+		return nil, err
+	}
+
+	ipAddresses := make([]netlink.Addr, 0, len(listIPv4)+len(listIPv6))
+	ipAddresses = append(ipAddresses, listIPv4...)
+	ipAddresses = append(ipAddresses, listIPv6...)
+
+	return ipAddresses, nil
+}
+
+func (n NetlinkManager) AddrDel(link netlink.Link, addr *netlink.Addr) error {
+	return netlink.AddrDel(link, addr)
+}
+
+func (n NetlinkManager) RouteAdd(route *netlink.Route) error {
+	return netlink.RouteAdd(route)
+}
+
+func (n NetlinkManager) RouteDel(route *netlink.Route) error {
+	return netlink.RouteDel(route)
+}
+
+func (n NetlinkManager) RouteReplace(route *netlink.Route) error {
+	return netlink.RouteReplace(route)
+}
+
+func (n NetlinkManager) RouteList(link netlink.Link, family int) ([]netlink.Route, error) {
+	return netlink.RouteList(link, family)
+}
+
+func (n NetlinkManager) RouteListFiltered(family int, filter *netlink.Route, filterMask uint64) ([]netlink.Route, error) {
+	return netlink.RouteListFiltered(family, filter, filterMask)
+}
+
+func (n NetlinkManager) RuleAdd(rule *netlink.Rule) error {
+	return netlink.RuleAdd(rule)
+}
+
+func (n NetlinkManager) RuleDel(rule *netlink.Rule) error {
+	return netlink.RuleDel(rule)
+}
+
+func (n NetlinkManager) RuleList(family int) ([]netlink.Rule, error) {
+	return netlink.RuleList(family)
+}