ofproto/ipfix-gen-entities

   1 #! /usr/bin/env python
   2 #
   3 # Copyright (C) 2012 Nicira, Inc.
   4 #
   5 # Copying and distribution of this file, with or without modification,
   6 # are permitted in any medium without royalty provided the copyright
   7 # notice and this notice are preserved.  This file is offered as-is,
   8 # without warranty of any kind.
   9
  10 from __future__ import print_function
  11
  12 import getopt
  13 import re
  14 import sys
  15 import xml.sax
  16 import xml.sax.handler
  17
  18
  19 class IpfixEntityHandler(xml.sax.handler.ContentHandler):
  20
  21     RECORD_FIELDS = ['name', 'dataType', 'elementId', 'status']
  22
  23     # Cf. RFC 5101, Section 6.
  24     DATA_TYPE_SIZE = {
  25         'unsigned8': 1,
  26         'unsigned16': 2,
  27         'unsigned32': 4,
  28         'unsigned64': 8,
  29         'signed8': 1,
  30         'signed16': 2,
  31         'signed32': 4,
  32         'signed64': 8,
  33         'float32': 4,
  34         'float64': 8,
  35         'boolean': 1,  # Not clear.
  36         'macAddress': 6,
  37         'octetArray': 0,  # Not clear.
  38         'string': 0,  # Not clear.
  39         'dateTimeSeconds': 4,
  40         'dateTimeMilliseconds': 8,
  41         'dateTimeMicroseconds': 8,
  42         'dateTimeNanoseconds': 8,
  43         'ipv4Address': 4,
  44         'ipv6Address': 16,
  45         }
  46
  47     def __init__(self):
  48         self.current_field_name = None
  49         self.current_field_value = []
  50         self.current_record = dict()
  51
  52     def startDocument(self):
  53         print("""\
  54 /* IPFIX entities. */
  55 #ifndef IPFIX_ENTITY
  56 #define IPFIX_ENTITY(ENUM, ID, SIZE, NAME)
  57 #endif
  58 """)
  59
  60     def endDocument(self):
  61         print("""
  62 #undef IPFIX_ENTITY""")
  63
  64     def startElement(self, name, attrs):
  65         if name in self.RECORD_FIELDS:
  66             self.current_field_name = name
  67         else:
  68             self.current_field_name = None
  69         self.current_field_value = []
  70
  71     @staticmethod
  72     def camelcase_to_uppercase(s):
  73         return re.sub('(.)([A-Z]+)', r'\1_\2', s).upper()
  74
  75     def endElement(self, name):
  76         if self.current_field_name is not None:
  77             self.current_record[self.current_field_name] = ''.join(
  78                 self.current_field_value).strip()
  79         elif (name == 'record'
  80               and self.current_record.get('status') == 'current'
  81               and 'dataType' in self.current_record):
  82
  83             self.current_record['enumName'] = self.camelcase_to_uppercase(
  84                 self.current_record['name'])
  85             self.current_record['dataTypeSize'] = self.DATA_TYPE_SIZE.get(
  86                 self.current_record['dataType'], 0)
  87
  88             print('IPFIX_ENTITY(%(enumName)s, %(elementId)s, '
  89                   '%(dataTypeSize)i, %(name)s)' % self.current_record)
  90             self.current_record.clear()
  91
  92     def characters(self, content):
  93         if self.current_field_name is not None:
  94             self.current_field_value.append(content)
  95
  96
  97 def print_ipfix_entity_macros(xml_file):
  98     xml.sax.parse(xml_file, IpfixEntityHandler())
  99
 100
 101 def usage(name):
 102     print("""\
 103 %(name)s: IPFIX entity definition generator
 104 Prints C macros defining IPFIX entities from the standard IANA file at
 105 <http://www.iana.org/assignments/ipfix/ipfix.xml>
 106 usage: %(name)s [OPTIONS] XML
 107 where XML is the standard IANA XML file defining IPFIX entities
 108
 109 The following options are also available:
 110   -h, --help                  display this help message
 111   -V, --version               display version information\
 112 """ % {'name': name})
 113     sys.exit(0)
 114
 115
 116 if __name__ == '__main__':
 117     try:
 118         options, args = getopt.gnu_getopt(sys.argv[1:], 'hV',
 119                                           ['help', 'version'])
 120     except getopt.GetoptError as geo:
 121         sys.stderr.write('%s: %s\n' % (sys.argv[0], geo.msg))
 122         sys.exit(1)
 123
 124     for key, value in options:
 125         if key in ['-h', '--help']:
 126             usage()
 127         elif key in ['-V', '--version']:
 128             print('ipfix-gen-entities (Open vSwitch)')
 129         else:
 130             sys.exit(0)
 131
 132     if len(args) != 1:
 133         sys.stderr.write('%s: exactly 1 non-option arguments required '
 134                          '(use --help for help)\n' % sys.argv[0])
 135         sys.exit(1)
 136
 137     print_ipfix_entity_macros(args[0])
 138
 139 # Local variables:
 140 # mode: python
 141 # End: