Merge branch 'develop' of https://github.com/jarradh/eth-go into jarradh-develop

ethereum.go

@@ -263,8 +263,32 @@ func (s *Ethereum) Start() {
 
 	if ethutil.Config.Seed {
 		ethutil.Config.Log.Debugln("Seeding")
-		// Testnet seed bootstrapping
+		// DNS Bootstrapping
-		resp, err := http.Get("https://www.ethereum.org/servers.poc3.txt")
+		_, nodes, err := net.LookupSRV("eth", "tcp", "ethereum.org")
+		if err == nil {
+			peers := []string{}
+			// Iterate SRV nodes
+			for _, n := range nodes {
+				target := n.Target
+				port := strconv.Itoa(int(n.Port))
+				// Resolve target to ip (Go returns list, so may resolve to multiple ips?)
+				addr, err := net.LookupHost(target)
+				if err == nil {
+					for _, a := range addr {
+						// Build string out of SRV port and Resolved IP
+						peer := net.JoinHostPort(a, port)
+						log.Println("Found DNS Bootstrap Peer:", peer)
+						peers = append(peers, peer)
+					}
+				} else {
+					log.Println("Couldn't resolve :", target)
+				}
+			}
+			// Connect to Peer list
+			s.ProcessPeerList(peers)
+		} else {
+			// Fallback to servers.poc3.txt
+			resp, err := http.Get("http://www.ethereum.org/servers.poc3.txt")
 			if err != nil {
 				log.Println("Fetching seed failed:", err)
 				return
@@ -278,6 +302,7 @@ func (s *Ethereum) Start() {
 
 			s.ConnectToPeer(string(body))
 		}
+	}
 }
 
 func (s *Ethereum) peerHandler(listener net.Listener) {