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Fix obviously colliding ICMP stream IDs

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But it looks like the underlying ICMPLIB model of receive() is broken for what I'm doing
This commit is contained in:
Reid 'arrdem' McKenzie 2021-11-22 01:32:11 -07:00
parent 7f42aa5449
commit e283123b3a
3 changed files with 223 additions and 36 deletions
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1
projects/aloe/BUILD
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@ -9,6 +9,7 @@ zapp_binary(
":lib",
py_requirement("graphviz"),
py_requirement("icmplib"),
py_requirement("pytz"),
py_requirement("requests"),
],
)

95
projects/aloe/src/python/aloe/__main__.py
View file

@ -12,15 +12,19 @@ from datetime import datetime, timedelta
from itertools import cycle
import logging
from multiprocessing import Process, Queue
from random import randint
import queue
import sys
from time import sleep
from typing import List
import graphviz
from icmplib import Hop, ping, traceroute
from icmplib import Hop, traceroute
from icmplib.utils import *
import requests
import pytz
from .urping import ping, urping
log = logging.getLogger(__name__)
@ -81,6 +85,8 @@ class Topology(object):
del self._graph[key]
del self._nodes[key]
INTERVAL = 0.5
Z = pytz.timezone("America/Denver")
def compute_topology(hostlist, topology=None):
"""Walk a series of traceroute tuples, computing a 'worst expected latency' topology from them."""
@ -89,20 +95,27 @@ def compute_topology(hostlist, topology=None):
for h in hostlist:
trace = traceroute(h)
# Restrict the trace to hosts which ICMP ping
trace = [e for e in trace if ping(e.address, count=1).is_alive]
trace = [e for e in trace if ping(e.address, interval=INTERVAL, count=3).is_alive]
topology.add_traceroute(trace)
return topology
def pinger(host, id, queue):
def pinger(host, queue, next=None):
# Mokney patch the RTT tracking
host._rtts = deque(host._rtts, maxlen=100)
id = randint(1, 1<<16 - 1)
sequence = 0
while True:
timeout = h.avg_rtt * 2 / 1000.0 # rtt is in ms but timeout is in sec.
start = datetime.now()
res = ping(host.address, id=id, timeout=timeout, count=3)
timeout = min(h.avg_rtt / 1000.0, 0.5) # rtt is in ms but timeout is in sec.
start = datetime.now(tz=Z)
res = ping(host.address, timeout=timeout, interval=INTERVAL, count=3, id=id, sequence=sequence)
sequence += res._packets_sent
queue.put((start, res))
sleep(INTERVAL)
if res.is_alive:
host._rtts.extend(res._rtts)
host._packets_sent += res._packets_sent
@ -112,28 +125,28 @@ if __name__ == "__main__":
logging.basicConfig(level=logging.DEBUG)
opts, args = parser.parse_known_args()
now = start = datetime.now()
now = start = datetime.now(tz=Z)
reconfigure_delay = timedelta(minutes=5)
configure_at = now - reconfigure_delay
flush_delay = timedelta(seconds=5)
flush_delay = timedelta(seconds=1)
flush_at = now + flush_delay
recovered_duration = timedelta(seconds=5)
dead_duration = timedelta(minutes=30)
topology = None
id = unique_identifier()
q = Queue()
workers = {}
last_seen = {}
state = {}
spinner = cycle("|/-\\")
with open("incidents.txt", "a") as fp:
fp.write("RESTART\n")
while True:
now = datetime.now()
now = datetime.now(tz=Z)
if flush_at <= now:
fp.flush()
@ -141,53 +154,63 @@ if __name__ == "__main__":
if configure_at <= now:
log.info("Attempting to reconfigure network topology...")
topology = compute_topology(opts.hosts, topology)
configure_at = now + reconfigure_delay
log.info("Graph -\n" + topology.render())
try:
topology = compute_topology(opts.hosts, topology)
configure_at = now + reconfigure_delay
log.info("Graph -\n" + topology.render())
for h in topology:
if h.distance == 0:
continue
for h in topology:
if h.distance == 0:
continue
if h.address in workers:
continue
if h.address in workers:
continue
else:
p = workers[h.address] = Process(target=pinger, args=(h, id, q))
p.start()
else:
n = next(iter(topology.next_hops(h.address)), None)
p = workers[h.address] = Process(target=pinger, args=(h, q, n))
p.start()
except Exception as e:
log.exception(e)
try:
timestamp, res = q.get(timeout=0.1)
# Revert to "logical now" of whenever the last ping results came in.
now, res = q.get(timeout=0.1)
last = last_seen.get(res.address)
delta = timestamp - last if last else None
delta = now - last if last else None
sys.stderr.write("\r" + next(spinner) + " " + f"ICMPResponse({res.address}, {res._rtts}, {res._packets_sent})" + " " * 20)
sys.stderr.flush()
if res.address not in workers:
pass
elif res.is_alive:
last_seen[res.address] = timestamp
last_seen[res.address] = now
if last and delta > recovered_duration:
state[res.address] = True
fp.write(
f"RECOVERED\t{res.address}\t{timestamp.isoformat()}\t{delta.total_seconds()}\n"
f"RECOVERED\t{res.address}\t{now.isoformat()}\t{delta.total_seconds()}\n"
)
elif not last:
fp.write(f"UP\t{res.address}\t{timestamp.isoformat()}\n")
state[res.address] = True
fp.write(f"UP\t{res.address}\t{now.isoformat()}\n")
elif not res.is_alive:
if last and delta > dead_duration:
workers[h.address].terminate()
del workers[h.address]
del topology[h.address]
del last_seen[h.address]
workers[res.address].terminate()
del workers[res.address]
del topology[res.address]
del last_seen[res.address]
del state[res.address]
fp.write(
f"DEAD\t{res.address}\t{timestamp.isoformat()}\t{delta.total_seconds()}\n"
f"DEAD\t{res.address}\t{now.isoformat()}\t{delta.total_seconds()}\n"
)
elif last and delta < recovered_duration:
fp.write(f"WARN\t{res.address}\t{timestamp.isoformat()}\n")
elif last and delta > recovered_duration:
fp.write(f"DOWN\t{res.address}\t{timestamp.isoformat()}\n")
elif last and delta > recovered_duration and state[res.address]:
fp.write(f"DOWN\t{res.address}\t{now.isoformat()}\n")
state[res.address] = False
except queue.Empty:
sys.stderr.write("\r" + next(spinner))

163
projects/aloe/src/python/aloe/urping.py Normal file
View file

@ -0,0 +1,163 @@
#!/usr/bin/env python3
import logging
from time import sleep
import traceback
from textwrap import indent
from random import randint
import sys
from icmplib.exceptions import (
ICMPLibError,
TimeExceeded,
TimeoutExceeded,
)
from icmplib.models import Host, Hop, ICMPRequest, ICMPReply
from icmplib.sockets import (
ICMPv4Socket,
ICMPv6Socket,
)
from icmplib.utils import *
log = logging.getLogger(__name__)
def better_repr(self):
elems = ", ".join(f"{slot}={getattr(self, slot)}" for slot in self.__slots__)
return f"<{type(self).__name__} ({elems})>"
ICMPRequest.__repr__ = better_repr
ICMPReply.__repr__ = better_repr
def urping(address: str,
hops: int,
via: str,
family=None,
count=3,
fudge=4,
id=None,
interval=0.2,
timeout=2,
source=None,
**kwargs) -> Hop:
"""Ur-ping by (ab)using ICMP TTLs.
Craft an ICMP message which would go one (or more) hops FARTHER than the `address` host, routed towards `via`.
Send `count * fudge` packets, looking for responses from `address`.
Responses from `address` are considered; and a `Hop` is built from those results.
Other responses from other hosts are discarded.
"""
if is_hostname(via):
via = resolve(via, family)[0]
if is_hostname(address):
address = resolve(address, falmiy)[0]
if is_ipv6_address(via):
_Socket = ICMPv6Socket
else:
_Socket = ICMPv4Socket
ttl = hops
hop = Hop(address, 0, [], hops)
packets_sent = 0
with _Socket(source) as sock:
for _ in range(count * fudge):
request = ICMPRequest(
destination=via,
# Note that we act like this is a new stream with a new ID and sequence each time to try and fool multipathing.
id=id or unique_identifier(),
sequence=0,
ttl=ttl,
**kwargs)
try:
sock.send(request)
packets_sent += 1
reply = None
reply = sock.receive(request, timeout)
rtt = (reply.time - request.time) * 1000
reply.raise_for_status()
assert reply.id == request.id
assert reply.sequence == request.sequence
assert reply.source == address
hop._packets_sent += 1
hop._rtts.append(rtt)
if hop._packets_sent >= count:
break
except AssertionError:
log.warning("Got response from unexpected node %s (expected %s) %r for request %4", reply.source, address, reply, request)
except (TimeoutExceeded, TimeExceeded):
pass
except ICMPLibError as e:
log.exception(e)
break
sleep(interval)
return hop
def ping(address, count=4, interval=1, timeout=2, id=None, source=None,
family=None, privileged=True, sequence=0, **kwargs):
"""A simple, if paranoid, ping."""
if is_hostname(address):
address = resolve(address, family)[0]
if is_ipv6_address(address):
_Socket = ICMPv6Socket
else:
_Socket = ICMPv4Socket
id = id or randint(1, 1<<16 - 1) & 0xFFFF
packets_sent = 0
rtts = []
with _Socket(source, privileged) as sock:
for base in range(count):
sequence = (sequence + base) & 0xFFFF
if base > 0:
sleep(interval)
request = ICMPRequest(
destination=address,
id=id,
sequence=sequence,
**kwargs)
try:
sock.send(request)
packets_sent += 1
reply = sock.receive(request, timeout)
reply.raise_for_status()
assert reply.id == request.id
assert reply.sequence == request.sequence
assert reply.source == address
rtt = (reply.time - request.time) * 1000
rtts.append(rtt)
except AssertionError as e:
exc_type, exc_value, exc_traceback = sys.exc_info()
log.warning("Got erroneous response:\n request: %r\n reply: %r\n err: |\n%s", request, reply, indent(traceback.format_exc(), " "))
except ICMPLibError:
pass
return Host(address, packets_sent, rtts)