Class _CertAuthoritiesField

scapy/layers/tls/handshake.py:1132–1164

XXX Rework this with proper ASN.1 parsing.

class _CertAuthoritiesField(StrLenField):
    """
    XXX Rework this with proper ASN.1 parsing.
    """
    islist = 1

    def getfield(self, pkt, s):
        tmp_len = self.length_from(pkt)
        return s[tmp_len:], self.m2i(pkt, s[:tmp_len])

    def m2i(self, pkt, m):
        res = []
        while len(m) > 1:
            tmp_len = struct.unpack("!H", m[:2])[0]
            if len(m) < tmp_len + 2:
                res.append((tmp_len, m[2:]))
                break
            dn = m[2:2 + tmp_len]
            res.append((tmp_len, dn))
            m = m[2 + tmp_len:]
        return res

    def i2m(self, pkt, i):
        return b"".join(map(lambda x_y: struct.pack("!H", x_y[0]) + x_y[1], i))

    def addfield(self, pkt, s, val):
        return s + self.i2m(pkt, val)

    def i2len(self, pkt, val):
        if val is None:
            return 0
        else:
            return len(self.i2m(pkt, val))


class TLSCertificateRequest(_TLSHandshake):