implement config parsing

setup.go

@@ -6,6 +6,7 @@ import (
 	"github.com/caddyserver/caddy"
 	"github.com/coredns/coredns/core/dnsserver"
 	"github.com/coredns/coredns/plugin"
+	"github.com/miekg/dns"
 	"golang.zx2c4.com/wireguard/wgctrl"
 )
 
@@ -14,19 +15,38 @@ func init() {
 }
 
 func setup(c *caddy.Controller) error {
+	c.Next() // Ignore "wgsd" and give us the next token.
+
+	// return an error if there is no zone specified
+	if !c.NextArg() {
+		return plugin.Error("wgsd", c.ArgErr())
+	}
+	zone := dns.Fqdn(c.Val())
+
+	// return an error if there is no device name specified
+	if !c.NextArg() {
+		return plugin.Error("wgsd", c.ArgErr())
+	}
+	device := c.Val()
+
+	// return an error if there are more tokens on this line
+	if c.NextArg() {
+		return plugin.Error("wgsd", c.ArgErr())
+	}
+
 	client, err := wgctrl.New()
 	if err != nil {
 		return fmt.Errorf("wgsd: error constructing wgctrl client: %v",
 			err)
 	}
 
-	// TODO: parse zone and wireguard device name from config
-
 	// Add the Plugin to CoreDNS, so Servers can use it in their plugin chain.
 	dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
 		return &WGSD{
 			Next:   next,
 			client: client,
+			zone:   zone,
+			device: device,
 		}
 	})