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#!/usr/bin/env python3
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 1998 Gerald Combs
#
# SPDX-License-Identifier: GPL-2.0-or-later
'''Update the IANA IP registry file.
Make-iana-ip creates a file containing information about IPv4/IPv6 allocation blocks.
'''
import csv
import io
import ipaddress
import os
import re
import sys
import urllib.request, urllib.error, urllib.parse
def exit_msg(msg=None, status=1):
if msg is not None:
sys.stderr.write(msg + '\n\n')
sys.stderr.write(__doc__ + '\n')
sys.exit(status)
def open_url(url):
'''Open a URL.
Returns a tuple containing the body and response dict. The body is a
str in Python 3 and bytes in Python 2 in order to be compatible with
csv.reader.
'''
if len(sys.argv) > 1:
url_path = os.path.join(sys.argv[1], url[1])
url_fd = open(url_path)
body = url_fd.read()
url_fd.close()
else:
url_path = '/'.join(url)
req_headers = { 'User-Agent': 'Wireshark iana-ip' }
try:
req = urllib.request.Request(url_path, headers=req_headers)
response = urllib.request.urlopen(req)
body = response.read().decode('UTF-8', 'replace')
except Exception:
exit_msg('Error opening ' + url_path)
return body
class IPv4SpecialBlock(ipaddress.IPv4Network):
@staticmethod
def ip_get_subnet_mask(bits):
masks = (
0x00000000,
0x80000000, 0xc0000000, 0xe0000000, 0xf0000000,
0xf8000000, 0xfc000000, 0xfe000000, 0xff000000,
0xff800000, 0xffc00000, 0xffe00000, 0xfff00000,
0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000,
0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000,
0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00,
0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0,
0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff)
if bits > 32:
ValueError("Expected bit mask less or equal to 32")
return masks[bits]
def __str__(self):
addr = self.network_address
mask = self.prefixlen
line = '{{ .ipv4 = {{ {:#x}, {:#010x} }} }}'.format(addr, self.ip_get_subnet_mask(mask))
return line
class IPv6SpecialBlock(ipaddress.IPv6Network):
@staticmethod
def addr_c_array(byte_array):
if len(byte_array) != 16:
raise ValueError("Expected byte array of length 16")
c_array = ", ".join(f"0x{byte:02x}" for byte in byte_array)
return f"{{ {c_array} }}"
def __str__(self):
addr = self.network_address.packed
mask = self.prefixlen
line = '{{ .ipv6 = {{ {}, {} }} }}'.format(self.addr_c_array(addr), mask)
return line
class IPRegistry(list):
@staticmethod
def true_or_false(val):
if val == 'True':
return '1'
elif val == 'False':
return '0'
else:
return '-1'
def append(self, row):
ip, name, _, _, termin_date, source, destination, forward, glob, reserved = row
if termin_date[0].isdigit():
# skip allocations that have expired
return
name = re.sub(r'\[.*\]', '', name)
name = '"' + name.replace('"', '\\"') + '"'
source = self.true_or_false(source)
destination = self.true_or_false(destination)
forward = self.true_or_false(forward)
glob = self.true_or_false(glob)
reserved = self.true_or_false(reserved)
super().append([ip, name, source, destination, forward, glob, reserved])
class IPv4Registry(IPRegistry):
@staticmethod
def ipv4_addr_and_mask(s):
ip = IPv4SpecialBlock(s)
return ip
def append(self, row):
# some lines contain multiple (comma separated) blocks
ip_list = row[0].split(',')
for s in ip_list:
# remove annotations like "1.1.1.1 [2]"
ip_str = s.split()[0]
row = [self.ipv4_addr_and_mask(ip_str)] + row[1:]
super().append(row)
def dump(self, fd):
self.sort()
fd.write('_U_ static const struct ws_iana_ip_special_block __ipv4_special_block[] = {\n')
for row in self:
line = ' {{ 4, {}, {}, {}, {}, {}, {}, {} }},\n'.format(*row)
fd.write(line)
fd.write('};\n')
class IPv6Registry(IPRegistry):
@staticmethod
def ipv6_addr_and_mask(s):
ip_str = s.split()[0]
ip = IPv6SpecialBlock(ip_str)
return ip
def append(self, row):
# remove annotations like "1.1.1.1 [2]"
ip_str = row[0].split()[0]
row = [self.ipv6_addr_and_mask(ip_str)] + row[1:]
super().append(row)
def dump(self, fd):
self.sort()
fd.write('// GCC bug?\n')
fd.write('DIAG_OFF(missing-braces)\n')
fd.write('_U_ static const struct ws_iana_ip_special_block __ipv6_special_block[] = {\n')
for row in self:
line = \
''' {{ 6, {},
{}, {}, {}, {}, {}, {} }},\n'''.format(*row)
fd.write(line)
fd.write('};\n')
fd.write('DIAG_ON(missing-braces)\n')
IANA_URLS = {
'IPv4': { 'url': ["https://www.iana.org/assignments/iana-ipv4-special-registry/", "iana-ipv4-special-registry-1.csv"], 'min_entries': 2 },
'IPv6': { 'url': ["https://www.iana.org/assignments/iana-ipv6-special-registry/", "iana-ipv6-special-registry-1.csv"], 'min_entries': 2 },
}
def dump_registry(db, fd, reg):
db_url = IANA_URLS[db]['url']
print('Loading {} data from {}'.format(db, db_url))
body = open_url(db_url)
iana_csv = csv.reader(body.splitlines())
# Pop the title row.
next(iana_csv)
for iana_row in iana_csv:
# Address Block,Name,RFC,Allocation Date,Termination Date,Source,Destination,Forwardable,Globally Reachable,Reserved-by-Protocol
# ::1/128,Loopback Address,[RFC4291],2006-02,N/A,False,False,False,False,True
reg.append(iana_row)
if len(reg) < IANA_URLS[db]['min_entries']:
exit_msg("Too few {} entries. Got {}, wanted {}".format(db, len(reg), IANA_URLS[db]['min_entries']))
reg.dump(fd)
def main():
iana_path = os.path.join('epan', 'iana-ip-data.c')
try:
fd = io.open(iana_path, 'w', encoding='UTF-8')
except Exception:
exit_msg("Couldn't open \"{}\" file for reading".format(iana_path))
fd.write('''/*
* This file was generated by running ./tools/make-iana-ip.py.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "iana-ip.h"
''')
dump_registry('IPv4', fd, IPv4Registry())
fd.write('\n')
dump_registry('IPv6', fd, IPv6Registry())
fd.close()
if __name__ == '__main__':
main()
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