pkg/wireguard: allow specifying iface named

This commit makes it possible to specify the Kilo interface name. If the
specified interface exists, it will be used; if it does not exist, Kilo
will create it. If the interface already existed, then it will not be
deleted on shutdown; otherwise Kilo will destroy the interface.

Fixes: https://github.com/squat/kilo/issues/8
Addresses: 1/2 of https://github.com/squat/kilo/issues/17

pkg/wireguard/conf_test.go

@@ -0,0 +1,172 @@
+// Copyright 2019 the Kilo authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package wireguard
+
+import (
+	"testing"
+)
+
+func TestCompareConf(t *testing.T) {
+	for _, tc := range []struct {
+		name string
+		a    []byte
+		b    []byte
+		out  bool
+	}{
+		{
+			name: "empty",
+			a:    []byte{},
+			b:    []byte{},
+			out:  true,
+		},
+		{
+			name: "key and value order",
+			a: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			b: []byte(`[Interface]
+		ListenPort = 51820
+		PrivateKey = private
+
+		[Peer]
+		PublicKey = key
+		AllowedIPs = 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32, 10.2.2.0/24
+		Endpoint = 10.1.0.2:51820
+		`),
+			out: true,
+		},
+		{
+			name: "whitespace",
+			a: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			b: []byte(`[Interface]
+		PrivateKey=private
+		ListenPort=51820
+		[Peer]
+		Endpoint=10.1.0.2:51820
+		PublicKey=key
+		AllowedIPs=10.2.2.0/24,192.168.0.1/32,10.2.3.0/24,192.168.0.2/32,10.4.0.2/32
+		`),
+			out: true,
+		},
+		{
+			name: "missing key",
+			a: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			b: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		PublicKey = key
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			out: false,
+		},
+		{
+			name: "section order",
+			a: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			b: []byte(`[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+
+		[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+		`),
+			out: true,
+		},
+		{
+			name: "out of order peers",
+			a: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key2
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key1
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			b: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key1
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key2
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			out: true,
+		},
+		{
+			name: "one empty",
+			a: []byte(`[Interface]
+		PrivateKey = private
+		ListenPort = 51820
+
+		[Peer]
+		Endpoint = 10.1.0.2:51820
+		PublicKey = key
+		AllowedIPs = 10.2.2.0/24, 192.168.0.1/32, 10.2.3.0/24, 192.168.0.2/32, 10.4.0.2/32
+		`),
+			b:   []byte(``),
+			out: false,
+		},
+	} {
+		equal := Parse(tc.a).Equal(Parse(tc.b))
+		if equal != tc.out {
+			t.Errorf("test case %q: expected %t, got %t", tc.name, tc.out, equal)
+		}
+	}
+}