winbox: initial commit of matcher (#255)

README.md

@@ -44,6 +44,7 @@ Current matchers:
 - **layer4.matchers.socks5** - matches connections that look like [SOCKSv5](https://www.rfc-editor.org/rfc/rfc1928.html).
 - **layer4.matchers.ssh** - matches connections that look like SSH connections.
 - **layer4.matchers.tls** - matches connections that start with TLS handshakes. In addition, any [`tls.handshake_match` modules](https://caddyserver.com/docs/modules/) can be used for matching on TLS-specific properties of the ClientHello, such as ServerName (SNI).
+- **layer4.matchers.winbox** - matches connections that look like those initiated by [Winbox](https://help.mikrotik.com/docs/display/ROS/WinBox), a graphical tool for MikroTik hardware and software routers management.
 - **layer4.matchers.wireguard** - matches connections the look like [WireGuard](https://www.wireguard.com/protocol/) connections.
 - **layer4.matchers.xmpp** - matches connections that look like [XMPP](https://xmpp.org/about/technology-overview/).
 

imports.go

@@ -33,6 +33,7 @@ import (
 	_ "github.com/mholt/caddy-l4/modules/l4tee"
 	_ "github.com/mholt/caddy-l4/modules/l4throttle"
 	_ "github.com/mholt/caddy-l4/modules/l4tls"
+	_ "github.com/mholt/caddy-l4/modules/l4winbox"
 	_ "github.com/mholt/caddy-l4/modules/l4wireguard"
 	_ "github.com/mholt/caddy-l4/modules/l4xmpp"
 )

integration/caddyfile_adapt/gd_matcher_winbox.caddytest

@@ -0,0 +1,85 @@
+{
+	layer4 {
+		:443 {
+			@w1 winbox {
+				modes standard romon
+				username toms
+			}
+			route @w1 {
+				proxy 192.168.0.1:8291
+			}
+			@w2 winbox {
+				modes standard
+				username_regexp ^andris|edgars|juris$
+			}
+			route @w2 {
+				proxy 192.168.0.2:8291
+			}
+		}
+	}
+}
+----------
+{
+	"apps": {
+		"layer4": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"winbox": {
+										"modes": [
+											"standard",
+											"romon"
+										],
+										"username": "toms"
+									}
+								}
+							],
+							"handle": [
+								{
+									"handler": "proxy",
+									"upstreams": [
+										{
+											"dial": [
+												"192.168.0.1:8291"
+											]
+										}
+									]
+								}
+							]
+						},
+						{
+							"match": [
+								{
+									"winbox": {
+										"modes": [
+											"standard"
+										],
+										"username_regexp": "^andris|edgars|juris$"
+									}
+								}
+							],
+							"handle": [
+								{
+									"handler": "proxy",
+									"upstreams": [
+										{
+											"dial": [
+												"192.168.0.2:8291"
+											]
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}