#!/usr/bin/env python
# $Id$
#
# Copyright (C) 2014 Dragon Research Labs ("DRL")
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND DRL DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL DRL BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.

"""
Scan rcynic validated output looking for router certificates, print
out stuff that the rpki-rtr code cares about.
"""

import os
import sys
import base64
import argparse
import rpki.POW
import rpki.oids

def check_dir(s):
  if not os.path.isdir(s):
    raise argparse.ArgumentTypeError("%r is not a directory" % s)
  return s

parser = argparse.ArgumentParser(description = __doc__)
parser.add_argument("rcynic_dir", type = check_dir, help = "rcynic authenticated output directory")
args = parser.parse_args()

for root, dirs, files in os.walk(args.rcynic_dir):

  for fn in files:

    if not fn.endswith(".cer"):
      continue

    x = rpki.POW.X509.derReadFile(os.path.join(root, fn))

    if rpki.oids.id_kp_bgpsec_router not in (x.getEKU() or ()):
      continue

    sys.stdout.write(base64.urlsafe_b64encode(x.getSKI()).rstrip("="))

    for min_asn, max_asn in x.getRFC3779()[0]:
      for asn in xrange(min_asn, max_asn + 1):
        sys.stdout.write(" %s" % asn)

    sys.stdout.write(" %s\n" % base64.b64encode(x.getPublicKey().derWritePublic()))