Remove send restriction

The valid peer list should only be applied when receiving new messages.
Sending to any node should always be allowed, as this is something that
comes from the inside, and we suppose that the protocols are correct.

Will need to bump the tag to v3.2.6 for inclusion in cothority

network/router.go

@@ -284,11 +284,6 @@ func (r *Router) Stop() error {
 // the messages are sent through the same connection and thus are correctly
 // ordered.
 func (r *Router) Send(e *ServerIdentity, msgs ...Message) (uint64, error) {
-	if !r.isPeerValid(e) {
-		return 0, xerrors.Errorf("%v rejecting send to %v: invalid peer",
-			r.ServerIdentity.ID, e.ID)
-	}
-
 	for _, msg := range msgs {
 		if msg == nil {
 			return 0, xerrors.New("cannot send nil-packets")

server_test.go

@@ -48,41 +48,6 @@ func TestServer_Database(t *testing.T) {
 	c.Close()
 }
 
-func TestServer_FilterConnectionsOutgoing(t *testing.T) {
-	local := NewTCPTest(tSuite)
-	defer local.CloseAll()
-
-	srv := local.GenServers(3)
-	msg := &SimpleMessage{42}
-
-	testPeersID := network.NewPeerSetID([]byte{})
-
-	// Initially, messages can be sent freely as there is no restriction
-	_, err := srv[0].Send(srv[1].ServerIdentity, msg)
-	require.NoError(t, err)
-	_, err = srv[1].Send(srv[2].ServerIdentity, msg)
-	require.NoError(t, err)
-	_, err = srv[2].Send(srv[0].ServerIdentity, msg)
-	require.NoError(t, err)
-
-	// Set the valid peers of Srv0 to Srv1 only
-	validPeers := []*network.ServerIdentity{srv[1].ServerIdentity}
-	srv[0].SetValidPeers(testPeersID, validPeers)
-	// Now Srv0 can send to Srv1, but not to Srv2
-	_, err = srv[0].Send(srv[1].ServerIdentity, msg)
-	require.NoError(t, err)
-	_, err = srv[0].Send(srv[2].ServerIdentity, msg)
-	require.Regexp(t, "rejecting.*invalid peer", err.Error())
-
-	// Add Srv2 to the valid peers of Srv0
-	srv[0].SetValidPeers(testPeersID, append(validPeers, srv[2].ServerIdentity))
-	// Now Srv0 can send to both Srv1 and Srv2
-	_, err = srv[0].Send(srv[1].ServerIdentity, msg)
-	require.NoError(t, err)
-	_, err = srv[0].Send(srv[2].ServerIdentity, msg)
-	require.NoError(t, err)
-}
-
 func TestServer_FilterConnectionsIncomingInvalid(t *testing.T) {
 	local := NewTCPTest(tSuite)
 	defer local.CloseAll()