Commit 3ddabafa authored by Steven Allen's avatar Steven Allen

fix: don't allow dialing DNS addresses

See https://github.com/libp2p/go-libp2p/issues/841
parent e74d5f34
......@@ -70,10 +70,12 @@ func NewTCPTransport(upgrader *tptu.Upgrader) *TcpTransport {
return &TcpTransport{Upgrader: upgrader, ConnectTimeout: DefaultConnectTimeout}
}
var dialMatcher = mafmt.And(mafmt.IP, mafmt.Base(ma.P_TCP))
// CanDial returns true if this transport believes it can dial the given
// multiaddr.
func (t *TcpTransport) CanDial(addr ma.Multiaddr) bool {
return mafmt.TCP.Matches(addr)
return dialMatcher.Matches(addr)
}
func (t *TcpTransport) maDial(ctx context.Context, raddr ma.Multiaddr) (manet.Conn, error) {
......
......@@ -36,6 +36,27 @@ func TestTcpTransport(t *testing.T) {
envReuseportVal = true
}
func TestTcpTransportCantDialDNS(t *testing.T) {
for i := 0; i < 2; i++ {
dnsa, err := ma.NewMultiaddr("/dns4/example.com/tcp/1234")
if err != nil {
t.Fatal(err)
}
tpt := NewTCPTransport(&tptu.Upgrader{
Secure: makeInsecureTransport(t),
Muxer: new(mplex.Transport),
})
if tpt.CanDial(dnsa) {
t.Fatal("shouldn't be able to dial dns")
}
envReuseportVal = false
}
envReuseportVal = true
}
func TestTcpTransportCantListenUtp(t *testing.T) {
for i := 0; i < 2; i++ {
utpa, err := ma.NewMultiaddr("/ip4/127.0.0.1/udp/0/utp")
......
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