143 lines
4.0 KiB
Python
Executable File
143 lines
4.0 KiB
Python
Executable File
#!/usr/bin/python
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import sys, os, socket, time, traceback, random, time
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from base64 import b64encode, b64decode
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from select import select
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buffer_size = 65536
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server_handshake = """HTTP/1.1 101 Web Socket Protocol Handshake\r
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Upgrade: WebSocket\r
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Connection: Upgrade\r
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WebSocket-Origin: %s\r
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WebSocket-Location: ws://%s%s\r
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WebSocket-Protocol: sample\r
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\r
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"""
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policy_response = """<cross-domain-policy><allow-access-from domain="*" to-ports="*" /></cross-domain-policy>"""
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def handshake(client):
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handshake = client.recv(1024)
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print "Handshake [%s]" % handshake
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if handshake.startswith("<policy-file-request/>"):
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print "Sending:", policy_response
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client.send(policy_response)
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handshake = client.recv(1024)
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print "Handshake [%s]" % handshake
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req_lines = handshake.split("\r\n")
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_, path, _ = req_lines[0].split(" ")
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_, origin = req_lines[4].split(" ")
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_, host = req_lines[3].split(" ")
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client.send(server_handshake % (origin, host, path))
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def traffic(token="."):
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sys.stdout.write(token)
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sys.stdout.flush()
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def check(buf):
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try:
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data = b64decode(buf[1:-1])
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except:
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return "Failed to decode"
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try:
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length, chksum, nums = data.split(':')
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length = int(length)
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chksum = int(chksum)
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except:
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return "Invalid data format"
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if len(nums) != length:
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return "Real length %d is not %d" % (len(nums), length)
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inv = nums.translate(None, "0123456789")
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if inv:
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return "Invalid characters found: %s" % inv
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real_chksum = 0
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for num in nums:
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real_chksum += int(num)
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if real_chksum != chksum:
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return "Real checksum %d is not %d" % (real_chksum, chksum)
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def generate():
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length = random.randint(10, 2000)
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numlist = []
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for i in range(0, length):
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numlist.append(random.randint(0, 9))
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chksum = sum(numlist)
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nums = "".join( [str(n) for n in numlist] )
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data = "%d:%d:%s" % (length, chksum, nums)
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buf = "\x00" + b64encode(data) + "\xff"
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return buf
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def responder(client, delay=500):
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global errors
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cqueue = []
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socks = [client]
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last_send = time.time() * 1000
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while True:
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ins, outs, excepts = select(socks, socks, socks, 1)
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if excepts: raise Exception("Socket exception")
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if client in ins:
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buf = client.recv(buffer_size)
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if len(buf) == 0: raise Exception("Client closed")
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#print "Client recv: %s (%d)" % (repr(buf[1:-1]), len(buf))
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err = check(buf)
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if err:
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traffic("}")
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errors = errors + 1
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print err
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else:
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traffic(">")
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now = time.time() * 1000
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if client in outs and now > (last_send + delay):
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last_send = now
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#print "Client send: %s" % repr(cqueue[0])
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client.send(generate())
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traffic("<")
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def start_server(listen_port, delay=500):
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global errors
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lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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lsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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lsock.bind(('', listen_port))
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lsock.listen(100)
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while True:
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try:
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csock = None
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print 'listening on port %s' % listen_port
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csock, address = lsock.accept()
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print 'Got client connection from %s' % address[0]
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handshake(csock)
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responder(csock, delay=delay)
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except Exception:
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print "accumulated errors:", errors
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errors = 0
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print "Ignoring exception:"
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print traceback.format_exc()
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if csock: csock.close()
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if __name__ == '__main__':
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errors = 0
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try:
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if len(sys.argv) < 2: raise
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listen_port = int(sys.argv[1])
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if len(sys.argv) == 3:
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delay = int(sys.argv[2])
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else:
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delay = 500
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except:
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print "Usage: <listen_port> [delay_ms]"
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sys.exit(1)
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start_server(listen_port, delay=delay)
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