So I have an issue with a websocket in Python. I'm trying to interface with a website that uses websockets for some of its content communication. Here is the javascript code on their site:
var $j = jQuery.noConflict(); // Use $j to reference JQuery selectors instead of $
function sockify() {
var ws = new WebSocket("ws://website:1234");
ws.onmessage = function (evt) {
console.log(evt.data)
$j('#output').html(evt.data);
}
ws.onopen = function () {
ws.send(JSON.stringify($j('#srctext').val()));
}
ws.onerror = function () {
alert("socket down");
}
}
So the site works fine, and theres no issue with it, however when I try this python code, I get an error stating that the socket has been closed immediately after it opens:
ws = create_connection("ws://website:1234/")
print "Sending 'Hello, World'..."
ws.send("Hello, World")
print "Sent"
print "Receiving..."
result = ws.recv()
print "Received '%s'" % result
ws.close()
This is sample code pulled from the websocket man page on python.org, and it does work if I do not change the host to the website i'm trying to pull from, but rather leave the example's host as it is in the example.
Here is the error I receive:
Traceback (most recent call last):
File "irc.py", line 462, in <module>
tmpmsg = getSocket()
File "irc.py", line 64, in getTrump
result = ws.recv()
File "/Library/Python/2.7/site-packages/websocket/_core.py", line 293, in recv
opcode, data = self.recv_data()
File "/Library/Python/2.7/site-packages/websocket/_core.py", line 310, in recv_data
opcode, frame = self.recv_data_frame(control_frame)
File "/Library/Python/2.7/site-packages/websocket/_core.py", line 323, in recv_data_frame
frame = self.recv_frame()
File "/Library/Python/2.7/site-packages/websocket/_core.py", line 357, in recv_frame
return self.frame_buffer.recv_frame()
File "/Library/Python/2.7/site-packages/websocket/_abnf.py", line 336, in recv_frame
self.recv_header()
File "/Library/Python/2.7/site-packages/websocket/_abnf.py", line 286, in recv_header
header = self.recv_strict(2)
File "/Library/Python/2.7/site-packages/websocket/_abnf.py", line 371, in recv_strict
bytes_ = self.recv(min(16384, shortage))
File "/Library/Python/2.7/site-packages/websocket/_core.py", line 427, in _recv
return recv(self.sock, bufsize)
File "/Library/Python/2.7/site-packages/websocket/_socket.py", line 93, in recv
"Connection is already closed.")
websocket._exceptions.WebSocketConnectionClosedException: Connection is already closed.
Any idea why its closing right away?
Edit:
Ran with enableTrace true.
Here is the error I get:
--- request header ---
GET / HTTP/1.1
Upgrade: websocket
Connection: Upgrade
Host: website
Origin: website
Sec-WebSocket-Key: 6jsV5DEWXPGTTTLKSEwz6g==
Sec-WebSocket-Version: 13
-----------------------
--- response header ---
HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: CX4DYsItQC6utXvt8JH641455mM=
-----------------------
send: '\x81\x8b\x98\x8d\x81\xce\xd0\xe8\xed\xa2\xf7\xad\xd6\xa1\xea\xe1\xe5'
Please note that I dont actually have control over the websocket, so any fixes would need to be on my end. I'm on Python 2.7.10
I also noticed that if I intercept the websocket request in Burp while using the website, the websocket initial connection request is different. Here it is as captured from the website:
GET / HTTP/1.1
Host: website
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:50.0) Gecko/20100101 Firefox/50.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Sec-WebSocket-Version: 13
Origin: website
Sec-WebSocket-Extensions: permessage-deflate
Sec-WebSocket-Key: uyG2WBK51ZtPhy9RXLNTmg==
Connection: keep-alive, Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
You have for sure an error (most probably your socket is exploding silently..)
set instead in the configuration a callback for the errors in the socket and print the msg you get..
example: (taken from here)
websocket.enableTrace(True)
ws = websocket.WebSocketApp("ws://echo.websocket.org/",
on_message = on_message,
on_error = on_error,
on_close = on_close)
and define the method
def on_error(ws, error):
print(error)