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deprecator.py
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deprecator.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""########################################################
########################################################
#
# Source address deprecator (deprecator.py)
#
# This program attempts to deprecate IPv6 globally
# routable source addresses when they are shown by
# probing to be broken, and to undeprecate them when
# they seem to work again. This could run in background
# on any host.
#
# It's intended to work on Windows or POSIX-compliant
# systems. It needs to be started after every
# system restart (boot). It needs root/Administrator
# privilege.
#
# On Windows, we use
# 'netsh int ipv6 set address $ADDR preferredlifetime=0 store=active'
# to deprecate the broken address.
#
# On Linux, we use
# 'ip addr change $ADDR/64 dev $INTERFACE preferred_lft 0'
# to deprecate the broken address.
#
# Other POSIX-compliant operating systems: TBD.
#
########################################################
#
# Released under the BSD "Revised" License as follows:
#
# Copyright (C) 2023 Brian E. Carpenter.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with
# or without modification, are permitted provided that the
# following conditions are met:
#
# 1. Redistributions of source code must retain the above
# copyright notice, this list of conditions and the following
# disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials
# provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of
# its contributors may be used to endorse or promote products
# derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
# AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
# THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
########################################################
########################################################"""
#Version 2 - uses RIPE Atlas anchor probes as target
import os
import ctypes
import sys
import socket
import ipaddress
import subprocess
import time
import random # used for testing
try:
from ripe.atlas.cousteau import Probe
except:
print("Could not import Probe",
"\nPlease install ripe.atlas.cousteau with pip or apt-get.")
askexit()
class depaddr:
"""Deprecated address"""
def __init__(self, addr):
self.addr = addr #IPv6 address
self.interface = None #Interface name
self.life = 0 #Lifetime when deprecated (seconds)
self.then = 0 #System time when deprecated (seconds)
def askexit():
"""Get me outa here"""
input("Press Enter to Exit.")
exit()
def refresh_guas():
"""Refresh GUA list"""
global guas
guas = []
# This code is o/s dependent
if windows:
_addrinfo = socket.getaddrinfo(socket.gethostname(),0)
for _af,_temp1,_temp2,_temp3,_addr in _addrinfo:
if _af == socket.AF_INET6:
_addr,_temp,_temp,_zid = _addr #get first item from tuple
if not '%' in _addr:
_loc = ipaddress.IPv6Address(_addr)
# Now test for GUA address
if _loc.is_global:
guas.append(_loc) # save GUA
else: #assume POSIX
ifs = netifaces.interfaces()
for interface in ifs:
config = netifaces.ifaddresses(interface)
if netifaces.AF_INET6 in config.keys():
for link in config[netifaces.AF_INET6]:
if 'addr' in link.keys():
_addr = link['addr']
if not '%' in _addr:
_loc = ipaddress.IPv6Address(_addr)
# Now test for GUA
if _loc.is_global:
guas.append(_loc) # save GUA
def tryping(a):
"""Try ping from specified source address; return success/fail Boolean"""
# This works by synthesising ping commands and parsing the
# text replies. It's very sensitive to any changes in ping
# implementations.
success = True
if windows:
cmd = "ping -6 -n 4 -S "+str(a)+" "+target
#print("CMD=", cmd)
for l in os.popen(cmd):
if "Received = 0" in l or "could not find host" in l:
#this source address fails
success = False
elif linux:
#Linux
cmd = "ping -6 -c 4 -I "+str(a)+" "+target
#print("CMD=", cmd)
for l in os.popen(cmd):
if " 0 received" in l or "not known" in l:
#this source address fails
success = False
else:
#Other POSIX TBD
success = False
return success
def getlife(a):
"""Return lifetime of an address in seconds, and its interface name"""
# This works by parsing the text replies to system commands.
# It's very sensitive to any changes in o/s details.
if windows:
for l in os.popen("netsh int ipv6 show addr"):
if l.startswith("Interface "):
_,ll = l.split(" ", maxsplit=1)
iname,_ = ll.split(":")
if str(a) in l:
h = 0
m = 0
s = 0
life = l.split()[2]
if life == "infinite":
return(-1, iname)
if "h" in life:
h,life = life.split("h")
h = int(h)
if "m" in life:
m,life = life.split("m")
m = int(m)
if "s" in life:
s,_ = life.split("s")
s = int(s)
return((3600*h + 60*m + s), iname)
elif linux:
found = False
for l in os.popen("ip addr"):
if found:
if "preferred_lft forever" in l:
return(-1, iname)
else:
_,life = l.split("preferred_lft ")
return(int(life[:-4]), iname)
if l[0].isdigit():
_,iname,_ = l.split(":", maxsplit=2)
iname = iname.strip()
found = str(a) in l
else:
#Other POSIX TBD
return(0, None)
print("=====================================================")
print("This program runs indefinitely to find failing IPv6")
print("source addresses and deprecate them.")
print("Probing interval is never less than 1 minute.")
print("=====================================================")
print("This is experimental software that might disturb network access.")
_l = input("Continue? Y/N: ")
if _l:
if _l[0] != "Y" and _l[0] != "y":
exit()
else:
exit()
testing = False
_l = input("Simulate random failures? Y/N: ")
if _l:
if _l[0] == "Y" or _l[0] == "y":
testing = True
my_os = sys.platform
windows = False
linux = False
if my_os == "win32":
print("You are running on Windows.")
windows = True
if not ctypes.windll.shell32.IsUserAnAdmin():
print("Cannot run without Administrator privilege.")
askexit()
print("Note: on Windows, anomalies have been seen when ULAs active.")
else:
if my_os not in ("linux", "linux2"):
print("Platform", my_os, "not yet supported.")
askexit()
try:
print("You are running on Linux.")
linux = True
import netifaces
if os.geteuid() != 0:
print("Cannot run without sudo privilege.")
askexit()
except:
print("Could not import netifaces",
"\nPlease install netifaces with pip or apt-get.")
askexit()
prng = random.SystemRandom()
target = None
_l = input("Probe target's FQDN or IPv6 address?\n(press ENTER for default): ")
if _l:
target = _l
if not tryping("::"):
print(_l, "is not pingable.")
target = None
if not target:
print("Choosing probe target; may take a minute...")
for i in range(1,10):
tryp = prng.randint(6000, 7200)
probe = Probe(id=tryp)
if probe.is_anchor and probe.status == 'Connected' and probe.address_v6:
target = probe.address_v6
if tryping("::"):
break
if not target:
target = "www.google.com" #ultimate fallback only
print("Using", target, "as probe target")
guas = [] # list of guas most recently found
deps = [] # list of currently deprecated addresses
loops = 1 # could be used for testing
while True:
refresh_guas()
if not (len(guas) + len(deps)):
print("No globally routable IPv6 address found.")
wait = 600 #10 minutes
else:
if len(guas) == 1:
print("Only one globally routable IPv6 address found.")
else:
print(len(guas), "globally routable IPv6 addresses found.")
print(guas)
teston = False
for a in guas:
pingfail = not tryping(a)
if testing and prng.randint(1, 4) == 3: # fail at random
teston = True
pingfail = True
if pingfail:
print("Attempting to deprecate", a)
# This works by synthesising system commands.
# It's very sensitive to any changes in o/s details.
da = depaddr(a)
da.life, da.interface = getlife(a)
da.then = int(time.monotonic())
deps.append(da)
if windows:
cmd = "netsh int ipv6 set address "+da.interface+" "+str(a)+" preferredlifetime=0 store=active"
elif linux:
cmd = "ip -6 addr change "+str(a)+"/64 dev "+da.interface+" preferred_lft 0"
else:
cmd = "#unsupported o/s"
print("CMD=", cmd)
for l in os.popen(cmd):
print(l)
else:
print("Ping OK from",str(a))
#Test those previously deprecated and reactivate if OK
i = 0 #manual loop count to allow for deletion
while i < len(deps):
if teston:
teston = False #skip this time round so that test works
break
a = deps[i].addr
print("Trying deprecated", a)
if tryping(a):
#Working again, need to restore it
print("Attempting to revive", a)
# This works by synthesising system commands.
# It's very sensitive to any changes in o/s details.
if windows:
if deps[i].life == -1:
life = "infinite"
else:
life = str(max(deps[i].life-(int(time.monotonic())-deps[i].then), 1000))
cmd = "netsh int ipv6 set address "+deps[i].interface+" "+str(a)+" preferredlifetime="+str(life)+" store=active"
elif linux:
if deps[i].life == -1:
life = "forever"
else:
life = str(max(deps[i].life-(int(time.monotonic())-deps[i].then), 1000))
cmd = "ip -6 addr change "+str(a)+"/64 dev "+deps[i].interface+" preferred_lft "+life
else:
cmd = "#unsupported o/s"
del(deps[i])
i -= 1 #offset loop count
print("CMD=", cmd)
for l in os.popen(cmd):
print(l)
i += 1
wait = 60 #1 minute
print("Waiting", wait, "seconds")
loops += 1
time.sleep(wait)