Class ServerLenField

scapy/layers/tls/extensions.py:199–208

There is no length when there are no servernames (as in a ServerHello).

class ServerLenField(FieldLenField):
    """
    There is no length when there are no servernames (as in a ServerHello).
    """

    def addfield(self, pkt, s, val):
        if not val:
            if not pkt.servernames:
                return s
        return super(ServerLenField, self).addfield(pkt, s, val)


class TLS_Ext_ServerName(TLS_Ext_PrettyPacketList):                 # RFC 4366