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April 30, 2022 01:38
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demonstration of Asterisk crash due to ARI Bridge race condition
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from multiprocessing.pool import Pool | |
from requests.auth import HTTPBasicAuth | |
from websocket import create_connection | |
import functools | |
import json | |
import random | |
import requests | |
import time | |
import urllib.parse | |
import threading | |
bridges = [] | |
channels = [] | |
auth = HTTPBasicAuth("admin", "peekaboo") | |
def create_bridges(): | |
for x in range(4): | |
params = urllib.parse.urlencode( | |
{ | |
"type": "mixing,dtmf_events,proxy_media", | |
"name": "bridge_{}".format(x), | |
} | |
) | |
url = "http://localhost:8088/ari/bridges?{}".format(params) | |
resp = requests.post(url, auth=auth) | |
bridges.append(resp.json()["id"]) | |
print("Bridges created", bridges) | |
def switch_bridge(id, x): | |
bridge = random.choice(bridges) | |
params = urllib.parse.urlencode( | |
{ | |
"absorbDTMF": 1, | |
"mute": 1, | |
"channel": id, | |
} | |
) | |
url = "http://localhost:8088/ari/bridges/{}/addChannel?{}".format(bridge, params) | |
requests.post(url, auth=auth) | |
# just to show something is happening... | |
print(".", end="") | |
if x % 80 == 0: | |
print() | |
return x | |
def start_race(): | |
with Pool(processes=10) as pool: | |
pool.map(functools.partial(switch_bridge, ",".join(channels)), range(20000)) | |
print("usually crashes before we get here...") | |
def listen_ws(ws): | |
while True: | |
result = json.loads(ws.recv()) | |
if result["type"] == "StasisStart" and result["args"][0] == "3": | |
print("4 calls connected, starting bridge switching in 3 seconds...") | |
time.sleep(3) | |
race_thread = threading.Thread(target=start_race) | |
race_thread.start() | |
def start(): | |
ws = create_connection( | |
"ws://localhost:8088/ari/events?api_key=admin:peekaboo&app=hello" | |
) | |
listen_thread = threading.Thread(target=listen_ws, args=(ws,)) | |
listen_thread.start() | |
create_bridges() | |
for x in range(4): | |
params = urllib.parse.urlencode( | |
{ | |
"endpoint": "PJSIP/localout/sip:127.0.0.1:5060", | |
"app": "hello", | |
"appArgs": "{}".format(x), | |
} | |
) | |
url = "http://localhost:8088/ari/channels?{}".format(params) | |
resp = requests.post(url, auth=HTTPBasicAuth("admin", "peekaboo")) | |
resp_json = resp.json() | |
channels.append(resp_json["id"]) | |
print("calls originated") | |
if __name__ == "__main__": | |
start() |
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