Correctly handle RPC listen addresses with IPv6 zones.

Fixes #341.

rpcserver.go

@@ -33,6 +33,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -194,6 +195,16 @@ func parseListeners(addrs []string) ([]string, []string, error) {
 			continue
 		}
 
+		// Remove the IPv6 zone from the host, if present.  The zone
+		// prevents ParseIP from correctly parsing the IP address.
+		// ResolveIPAddr is intentionally not used here due to the
+		// possibility of leaking a DNS query over Tor if the host is a
+		// hostname and not an IP address.
+		zoneIndex := strings.Index(host, "%")
+		if zoneIndex != -1 {
+			host = host[:zoneIndex]
+		}
+
 		// Parse the IP.
 		ip := net.ParseIP(host)
 		if ip == nil {