Class _TLSPadField

scapy/layers/tls/basefields.py:184–212

class _TLSPadField(StrField):
    def i2len(self, pkt, i):
        if i is not None:
            return len(i)
        return 0

    def i2m(self, pkt, x):
        if x is None:
            return b""
        return x

    def addfield(self, pkt, s, val):
        # We add nothing here. This is done in .post_build() if needed.
        return s

    def getfield(self, pkt, s):
        if pkt.tls_session.consider_read_padding():
            # This should work with SSLv3 and also TLS versions.
            # Note that we need to retrieve pkt.padlen beforehand,
            # because it's possible that the padding is followed by some data
            # from another TLS record (hence the last byte from s would not be
            # the last byte from the current record padding).
            tmp_len = orb(s[pkt.padlen - 1])
            return s[tmp_len:], self.m2i(pkt, s[:tmp_len])
        return s, None

    def i2repr(self, pkt, x):
        # XXX Provide status when dissection has been performed successfully?
        return repr(self.i2m(pkt, x))


class _TLSPadLenField(ByteField):