1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
############################################################################
#
# This tool allows an arbitrary number of TCP connections to be made to the
# specified service and to keep them open until told otherwise. It is
# controlled by writing text commands to a TCP socket (default port: 5309).
#
# Currently supported commands:
#
# - open <COUNT> <HOST> <PORT>
#
# Opens <COUNT> TCP connections to <HOST>:<PORT> and keeps them open.
# <HOST> must be an IP address (IPv4 or IPv6).
#
# - close <COUNT>
#
# Close the oldest <COUNT> previously established connections.
#
############################################################################
from __future__ import print_function
import datetime
import errno
import os
import select
import signal
import socket
import sys
import time
# Timeout for establishing all connections requested by a single 'open' command.
OPEN_TIMEOUT = 2
VERSION_QUERY = b"\x00\x1e\xaf\xb8\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x07version\x04bind\x00\x00\x10\x00\x03"
def log(msg):
print(datetime.datetime.now().strftime("%d-%b-%Y %H:%M:%S.%f ") + msg)
def open_connections(active_conns, count, host, port):
queued = []
errors = []
try:
socket.inet_aton(host)
family = socket.AF_INET
except socket.error:
family = socket.AF_INET6
log("Opening %d connections..." % count)
for _ in range(count):
sock = socket.socket(family, socket.SOCK_STREAM)
sock.setblocking(0)
err = sock.connect_ex((host, port))
if err not in (0, errno.EINPROGRESS):
log("%s on connect for socket %s" % (errno.errorcode[err], sock))
errors.append(sock)
else:
queued.append(sock)
start = time.time()
while queued:
now = time.time()
time_left = OPEN_TIMEOUT - (now - start)
if time_left <= 0:
break
_, wsocks, _ = select.select([], queued, [], time_left)
for sock in wsocks:
queued.remove(sock)
err = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
if err:
log("%s for socket %s" % (errno.errorcode[err], sock))
errors.append(sock)
else:
sock.send(VERSION_QUERY)
active_conns.append(sock)
if errors:
log("result=FAIL: %d connection(s) failed" % len(errors))
elif queued:
log("result=FAIL: Timed out, aborting %d pending connections" % len(queued))
for sock in queued:
sock.close()
else:
log("result=OK: Successfully opened %d connections" % count)
def close_connections(active_conns, count):
log("Closing %s connections..." % "all" if count == 0 else str(count))
if count == 0:
count = len(active_conns)
for _ in range(count):
sock = active_conns.pop(0)
sock.close()
log("result=OK: Successfully closed %d connections" % count)
def sigterm(*_):
log("SIGTERM received, shutting down")
os.remove("ans.pid")
sys.exit(0)
def main():
active_conns = []
signal.signal(signal.SIGTERM, sigterm)
with open("ans.pid", "w") as pidfile:
print(os.getpid(), file=pidfile)
listenip = "10.53.0.6"
try:
port = int(os.environ["CONTROLPORT"])
except KeyError:
port = 5309
log("Listening on %s:%d" % (listenip, port))
ctlsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ctlsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
ctlsock.bind((listenip, port))
ctlsock.listen(1)
while True:
(clientsock, _) = ctlsock.accept()
log("Accepted control connection from %s" % clientsock)
cmdline = clientsock.recv(512).decode("ascii").strip()
if cmdline:
log("Received command: %s" % cmdline)
cmd = cmdline.split()
if cmd[0] == "open":
count, host, port = cmd[1:]
open_connections(active_conns, int(count), host, int(port))
elif cmd[0] == "close":
(count,) = cmd[1:]
close_connections(active_conns, int(count))
else:
log("result=FAIL: Unknown command")
clientsock.close()
if __name__ == "__main__":
main()
|
