# $Id$
#
# Copyright (C) 2010-2012  Internet Systems Consortium ("ISC")
#
# Permission to use, copy, modify, and 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 ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL ISC 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.

"""
Parse IANA XML data.
"""

import sys
import lxml.etree
from rpki.csv_utils import csv_reader, csv_writer
from rpki.resource_set import resource_bag

def iterate_xml(filename, tag):
    return lxml.etree.parse(filename).getroot().getiterator(tag)

def ns(tag):
    return "{http://www.iana.org/assignments}" + tag

tag_description = ns("description")
tag_designation = ns("designation")
tag_record      = ns("record")
tag_number      = ns("number")
tag_prefix      = ns("prefix")
tag_status      = ns("status")

handles = {}
rirs = { "legacy" : resource_bag() }

for rir in ("AfriNIC", "APNIC", "ARIN", "LACNIC", "RIPE NCC"):
    handle = rir.split()[0].lower()
    handles[rir] = handles["Assigned by %s" % rir] = handles["Administered by %s" % rir] = handle
    rirs[handle] = resource_bag()

asns     = csv_writer("asns.csv")
prefixes = csv_writer("prefixes.csv")

for record in iterate_xml("as-numbers.xml", tag_record):
    description = record.findtext(tag_description)
    if description in handles:
        asns.writerow((handles[description], record.findtext(tag_number)))

for record in iterate_xml("ipv4-address-space.xml", tag_record):
    designation = record.findtext(tag_designation)
    if record.findtext(tag_status) != "RESERVED":
        prefix, prefixlen = [int(i) for i in record.findtext(tag_prefix).split("/")]
        if prefixlen != 8:
            raise ValueError("%s violated /8 assumption" % record.findtext(tag_prefix))
        rirs[handles.get(designation, "legacy")] |= resource_bag.from_str("%d.0.0.0/8" % prefix)

for record in iterate_xml("ipv6-unicast-address-assignments.xml", tag_record):
    description = record.findtext(tag_description)
    if record.findtext(tag_description) in handles:
        rirs[handles[description]] |= resource_bag.from_str(record.findtext(tag_prefix))

erx = list(csv_reader("erx.csv"))
assert all(r in rirs for r, p in erx)

erx_overrides = resource_bag.from_str(",".join(p for r, p in erx), allow_overlap = True)

for rir in rirs:
    if rir != "legacy":
        rirs[rir] -= erx_overrides
        rirs[rir] |= resource_bag.from_str(",".join(p for r, p in erx if r == rir), allow_overlap = True)

for rir, bag in rirs.iteritems():
    for p in bag.v4:
        prefixes.writerow((rir, p))
    for p in bag.v6:
        prefixes.writerow((rir, p))

asns.close()
prefixes.close()