Use IsDomainName (#119)

Liberal as it as it still has its use. Reject invalid domain names
in the config.

Unrelated: clear up the README as well. And fix travis script.

.travis.yml

@@ -3,6 +3,7 @@ go:
   - 1.5
   - 1.6
 before_script:
+  - go get
   - go get github.com/coreos/etcd
   - go get github.com/coreos/go-etcd/etcd
   - go build -o $HOME/gopath/src/github.com/coreos/etcd/etcd.run github.com/coreos/etcd

README.md

@@ -5,26 +5,32 @@ same model: it chains middleware.
 
 ## Status
 
+I'm using CoreDNS is my primary, authoritative, nameserver for my domains (`miek.nl`, `atoom.net`
+and a few others). CoreDNS should be stable enough to provide you with a good DNS service.
+
 Currently CoreDNS is able to:
 
-* Serve zone data from a file, both DNSSEC (NSEC only atm) and DNS is supported.
+* Serve zone data from a file, both DNSSEC (NSEC only atm) and DNS is supported. Delegation are
+    *not* supported as yet.
 * Retrieve zone data from primaries, i.e. act as a secondary server.
 * Allow for zone transfers, i.e. act as a primary server.
-* Use Etcd as a backend, i.e. a 90% replacement for
+* Use Etcd as a backend, i.e. a 92% replacement for
   [SkyDNS](https://github.com/skynetservices/skydns).
 * Serve as a proxy to forward queries to some other (recursive) nameserver.
 * Rewrite queries (both qtype, qclass and qname).
-* Provide metrics (by using Prometheus)
+* Provide metrics (by using Prometheus).
 * Provide Logging.
+* Provide load-balancing of returned responses.
+* Has support for the CH class: `version.bind` and friends.
 
 There are corner cases not implemented and a few [issues](https://github.com/miekg/coredns/issues).
 
 But all in all, CoreDNS should already be able to provide you with enough functionality to replace
 parts of BIND9, Knot, NSD or PowerDNS.
-However CoreDNS is still in the early stages of development and should **not** be used on production
-servers yet. For now most documentation is in the source and some blog articles can be [found
-here](https://miek.nl/tags/coredns/). If you do want to use CoreDNS in production, please let us
-know and how we can help.
+
+However CoreDNS is still in the early stages of development. For now most documentation is in the
+source and some blog articles can be [found here](https://miek.nl/tags/coredns/). If you do want to
+use CoreDNS in production, please let us know and how we can help.
 
 <https://caddyserver.com/> is also full of examples on how to structure a Corefile (renamed from
 Caddyfile when I forked it).
@@ -64,7 +70,6 @@ nameserver *and* rewrite ANY queries to HINFO.
 ~~~ txt
 .:1053 {
     rewrite ANY HINFO
-
     proxy . 8.8.8.8:53
 
     file /var/lib/bind/miek.nl.signed miek.nl {

core/caddy.go

@@ -390,8 +390,8 @@ type Input interface {
 }
 
 // TestServer returns a test server.
-// The port can be retreived with ... . The testserver itself can be stopped
-// with Stop(). It just takes a normal Corefile input, but doesn't use the port.
+// The ports can be retreived with server.LocalAddr(). The testserver itself can be stopped
+// with Stop(). It just takes a normal Corefile as input.
 func TestServer(t *testing.T, corefile string) (*server.Server, error) {
 
 	cdyfile := CaddyfileInput{Contents: []byte(corefile)}

core/parse/parsing.go

@@ -1,6 +1,7 @@
 package parse
 
 import (
+	"fmt"
 	"net"
 	"os"
 	"path/filepath"
@@ -320,6 +321,14 @@ func standardAddress(str string) (address, error) {
 		// no error check here; return err at end of function
 	}
 
+	if len(host) > 255 {
+		return address{}, fmt.Errorf("specified address is too long: %d > 255", len(host))
+	}
+	_, d := dns.IsDomainName(host)
+	if !d {
+		return address{}, fmt.Errorf("host is not a valid domain: %s", host)
+	}
+
 	// see if we can set port based off scheme
 	if port == "" {
 		port = "53"