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# $Id$
import base64, sax_utils, resource_set
Broken = True
assert ! Broken
# This still isn't right, although it's not as broken as it was. I
# don't see any sane way to avoid keeping a stack of objects under
# construction, probably in our sax_handler object. Passing SAX
# events along to the current object is ok, but passing every SAX
# event down through the chain of objects under construction is just
# nuts. So probably want push and pop methods in the sax_handler so
# that the current object can create a child and push it onto the
# stack, and so that a current object can pop itself off the stack.
class base_elt(object):
"""
Base type for left-right message elements.
"""
def __init__(self, up=None):
self.up = up
for key in self.multivalue:
setattr(self, key, [])
multivalue = ("peer_contact", "signing_cert", "extension_preference", "resource_class",
"as_number", "as_range", "subset_as_number", "subset_as_range",
"ipv4_prefix", "ipv4_range", "subset_ipv4_prefix", "subset_ipv4_range",
"ipv6_prefix", "ipv6_range", "subset_ipv6_prefix", "subset_ipv6_range")
def store(self, key, val):
if key in self.multivalue:
getattr(self, key).append(val)
else:
setattr(self, key, val)
b64content = ("peer_ta", "pkcs10_cert_request", "public_key", "signing_cert")
def endElement(self, name, text):
if name in self.b64content:
self.store(name, base64.b64decode(text))
pdu_objects = ("self", "child", "parent", "bsc", "repository", "route_origin",
"list_resources", "report_error")
def startElement(self, name, attrs):
if name in pdu_objects:
sax_utils.snarf_attribute(self, attrs, self.attributes)
else:
getattr(self, "handle_" + name)(name, attrs)
# handle_xxx methods not yet written
class self_elt(base_elt):
attributes = ("action", "self_id")
class bsc_elt(base_elt):
attributes = ("action", "self_id", "biz_signing_context_id")
class parent_elt(base_elt):
attributes = ("action", "self_id", "parent_id")
class child_elt(base_elt):
attributes = ("action", "self_id", "child_id")
class repository_elt(base_elt):
attributes = ("action", "self_id", "repository_id")
class route_origin_elt(base_elt):
attributes = ("action", "self_id", "route_origin_id")
class list_resources_elt(base_elt):
attributes = ("self_id", "child_id")
class report_error_elt(base_elt):
attributes = ("self_id", "error_code")
class msg(list):
"""
Left-right PDU.
"""
spec_uri = "http://www.hactrn.net/uris/rpki/left-right-spec/"
version = 1
dispatch = {
"self" : self_elt,
"child" : child_elt,
"parent" : parent_elt,
"repository" : repository_elt,
"route_origin" : route_origin_elt,
"bsc" : bsc_elt,
"list_resources" : list_resources_elt,
"report_error" : report_error_elt }
def startElement(self, name, attrs):
if name == "msg":
sax_utils.snarf_attribute(self, attrs, "version", int)
sax_utils.snarf_attribute(self, attrs, "type")
assert self.version == 1
else:
if name in self.dispatch:
self.append(self.dispatch[name](self))
self[-1].startElement(name, attrs)
def endElement(self, name, text):
self[-1].endElement(name, text)
def __str__(self):
return ('<?xml version="1.0" encoding="US-ASCII" ?>\n'
'<msg xmlns="%s" version="%d" type="%s">\n' \
% (self.spec_uri, self.version, self.type)
) + "".join(map(str,self)) + "</msg>\n"
class sax_handler(sax_utils.handler):
"""
SAX handler for Left-Right protocol.
"""
def startElement(self, name, attrs):
if name == "msg":
self.set_obj(msg())
self.obj.startElement(name, attrs)
def endElement(self, name):
self.obj.endElement(name, self.get_text())
# bsc_link ; attribute-only element
# child_db_id ; attribute-only element
# repository_link ; attribute-only element
# sia_base ; attribute-only element
#
# as_number ; attribute-only element, single/multi depending on context (sigh)
# as_range ; attribute-only element, multi
# ipv4_prefix ; attribute-only element, multi
# ipv4_range ; attribute-only element, multi
# ipv6_prefix ; attribute-only element, multi
# ipv6_range ; attribute-only element, multi
# peer_contact ; attribute-only element, multi
# subset_as_number ; attribute-only element, multi
# subset_as_range ; attribute-only element, multi
# subset_ipv4_prefix ; attribute-only element, multi
# subset_ipv4_range ; attribute-only element, multi
# subset_ipv6_prefix ; attribute-only element, multi
# subset_ipv6_range ; attribute-only element, multi
#
# peer_ta ; base64 element
# pkcs10_cert_request ; base64 element
# public_key ; base64 element
# signing_cert ; base64 element, multi
#
# extension_preference ; container element, multi
# resource_class ; container element, multi
#
# generate_keypair ; attribute-only control element
# publish_world_now ; empty control element
# reissue ; empty control element
# rekey ; empty control element
# revoke ; empty control element
# run_now ; empty control element
# suppress_publication ; empty control element
#
# msg ; pdu
# bsc ; pdu element
# child ; pdu element
# list_resources ; pdu element
# parent ; pdu element
# report_error ; pdu element
# repository ; pdu element
# route_origin ; pdu element
# self ; pdu element
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