filter peers using non-std ports

zcash/address_book.go

@@ -224,7 +224,7 @@ func (bk *AddressBook) waitForAddresses(n int, done chan struct{}) {
 
 // GetAddressList returns a slice of n valid addresses in random order.
 // If there aren't enough known addresses, it returns as many as we have.
-func (bk *AddressBook) shuffleAddressList(n int, v6 bool) []net.IP {
+func (bk *AddressBook) shuffleAddressList(n int, v6 bool, defaultPort string) []net.IP {
 	bk.addrState.RLock()
 	defer bk.addrState.RUnlock()
 
@@ -246,6 +246,13 @@ func (bk *AddressBook) shuffleAddressList(n int, v6 bool) []net.IP {
 			continue
 		}
 
+		if strconv.Itoa(int(v.netaddr.Port)) != defaultPort {
+			// The DNS seeder is only able to return IP addresses, and it can't report
+			// ports. For this reason, we can only return addresses that are using
+			// the standard port.
+			continue
+		}
+
 		resp = append(resp, v.netaddr.IP)
 	}
 

zcash/client.go

@@ -543,12 +543,12 @@ func (s *Seeder) Ready() bool {
 
 // Addresses returns a slice of n IPv4 addresses or as many as we have if it's less than that.
 func (s *Seeder) Addresses(n int) []net.IP {
-	return s.addrBook.shuffleAddressList(n, false)
+	return s.addrBook.shuffleAddressList(n, false, s.GetNetworkDefaultPort())
 }
 
 // AddressesV6 returns a slice of n IPv6 addresses or as many as we have if it's less than that.
 func (s *Seeder) AddressesV6(n int) []net.IP {
-	return s.addrBook.shuffleAddressList(n, true)
+	return s.addrBook.shuffleAddressList(n, true, s.GetNetworkDefaultPort())
 }
 
 // GetPeerCount returns how many valid peers we know about.