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#!/usr/bin/env python3
#
# Copyright (C) 2012, 2020 Nicira, Inc.
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without warranty of any kind.
import getopt
import re
import sys
import xml.sax
import xml.sax.handler
class IpfixEntityHandler(xml.sax.handler.ContentHandler):
RECORD_FIELDS = ['name', 'dataType', 'elementId', 'status']
# Cf. RFC 5101, Section 6.
DATA_TYPE_SIZE = {
'unsigned8': 1,
'unsigned16': 2,
'unsigned32': 4,
'unsigned64': 8,
'signed8': 1,
'signed16': 2,
'signed32': 4,
'signed64': 8,
'float32': 4,
'float64': 8,
'boolean': 1, # Not clear.
'macAddress': 6,
'octetArray': 0, # Not clear.
'string': 0, # Not clear.
'dateTimeSeconds': 4,
'dateTimeMilliseconds': 8,
'dateTimeMicroseconds': 8,
'dateTimeNanoseconds': 8,
'ipv4Address': 4,
'ipv6Address': 16,
}
def __init__(self):
self.current_field_name = None
self.current_field_value = []
self.current_record = dict()
def startDocument(self):
print("""\
/* IPFIX entities. */
#ifndef IPFIX_ENTITY
#define IPFIX_ENTITY(ENUM, ID, SIZE, NAME)
#endif
""")
def endDocument(self):
print("""
#undef IPFIX_ENTITY""")
def startElement(self, name, attrs):
if name in self.RECORD_FIELDS:
self.current_field_name = name
else:
self.current_field_name = None
self.current_field_value = []
@staticmethod
def camelcase_to_uppercase(s):
return re.sub('(.)([A-Z]+)', r'\1_\2', s).upper()
def endElement(self, name):
if self.current_field_name is not None:
self.current_record[self.current_field_name] = ''.join(
self.current_field_value).strip()
elif (name == 'record'
and self.current_record.get('status') == 'current'
and 'dataType' in self.current_record):
self.current_record['enumName'] = self.camelcase_to_uppercase(
self.current_record['name'])
self.current_record['dataTypeSize'] = self.DATA_TYPE_SIZE.get(
self.current_record['dataType'], 0)
print('IPFIX_ENTITY(%(enumName)s, %(elementId)s, '
'%(dataTypeSize)i, %(name)s)' % self.current_record)
self.current_record.clear()
def characters(self, content):
if self.current_field_name is not None:
self.current_field_value.append(content)
def print_ipfix_entity_macros(xml_file):
xml.sax.parse(xml_file, IpfixEntityHandler())
def usage(name):
print("""\
%(name)s: IPFIX entity definition generator
Prints C macros defining IPFIX entities from the standard IANA file at
<http://www.iana.org/assignments/ipfix/ipfix.xml>
usage: %(name)s [OPTIONS] XML
where XML is the standard IANA XML file defining IPFIX entities
The following options are also available:
-h, --help display this help message
-V, --version display version information\
""" % {'name': name})
sys.exit(0)
if __name__ == '__main__':
try:
options, args = getopt.gnu_getopt(sys.argv[1:], 'hV',
['help', 'version'])
except getopt.GetoptError as geo:
sys.stderr.write('%s: %s\n' % (sys.argv[0], geo.msg))
sys.exit(1)
for key, value in options:
if key in ['-h', '--help']:
usage(sys.argv[0])
elif key in ['-V', '--version']:
print('ipfix-gen-entities (Open vSwitch)')
else:
sys.exit(0)
if len(args) != 1:
sys.stderr.write('%s: exactly 1 non-option arguments required '
'(use --help for help)\n' % sys.argv[0])
sys.exit(1)
print_ipfix_entity_macros(args[0])
# Local variables:
# mode: python
# End:
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