fix v6 ip presentation.

Also fix the parsing from /etc/resolv.conf and make it simpler
in the process.

TODO.markdown

@@ -1,7 +1,5 @@
 # TODO
 
-* 'q' standardize ipv6 input with [::1]#53 ?
-* make example from chaos
 * Support for on-the-fly-signing
 * (Re)sign zonefiles
 * TLSA support
@@ -11,6 +9,6 @@
 
 ## Nice to have
 
-* Speed, we can always go faster. A simple reflect server now hits 35/45K qps
+* Speed, we can always go faster. A simple reflect server now hits 45/50K qps
 * go test; only works correct on my machine
 * privatekey.Precompute() when signing? 

clientconfig.go

@@ -32,7 +32,7 @@ func ClientConfigFromFile(conf string) (*ClientConfig, error) {
 	}
 	c := new(ClientConfig)
 	b := bufio.NewReader(file)
-	c.Servers = make([]string, 3)[0:0] // small, but the standard limit
+	c.Servers = make([]string, 0)
 	c.Search = make([]string, 0)
 	c.Port = "53"
 	c.Ndots = 1
@@ -45,21 +45,17 @@ func ClientConfigFromFile(conf string) (*ClientConfig, error) {
 		}
 		switch f[0] {
 		case "nameserver": // add one name server
-			a := c.Servers
-			n := len(a)
-			if len(f) > 1 && n < cap(a) {
+			if len(f) > 1 {
 				// One more check: make sure server name is
 				// just an IP address.  Otherwise we need DNS
 				// to look it up.
 				name := f[1]
-				switch len(net.ParseIP(name)) {
-				case 16:
+				switch x := net.ParseIP(name); true {
+				case x.To4() != nil:
+					c.Servers = append(c.Servers, name)
+				case x.To16() != nil:
 					name = "[" + name + "]"
-					fallthrough
-				case 4:
-					a = a[0 : n+1]
-					a[n] = name
-					c.Servers = a
+					c.Servers = append(c.Servers, name)
 				}
 			}
 

ex/q/q.go

@@ -105,9 +105,19 @@ Flags:
 		qtype = dns.TypeA
 	}
 
-	nameserver = dns.Fqdn(string([]byte(nameserver)[1:])) // chop off @
-	nameserver += ":" + strconv.Itoa(*port)
-
+	nameserver = string([]byte(nameserver)[1:]) // chop off @
+	if i := net.ParseIP(nameserver); i != nil {
+		switch {
+		case i.To4() != nil:
+			// it's a v4 address
+			nameserver += ":" + strconv.Itoa(*port)
+		case i.To16() != nil:
+			// v6 address
+			nameserver = "[" + nameserver + "]:" + strconv.Itoa(*port)
+		}
+	} else {
+		nameserver = dns.Fqdn(nameserver) + ":" + strconv.Itoa(*port)
+	}
 	// We use the async query handling, just to show how it is to be used.
 	c := new(dns.Client)
 	if *tcp {