Move wsproxy and web utils into utils/ subdir.

utils/websocket.py

@@ -0,0 +1,124 @@
+#!/usr/bin/python
+
+'''
+Python WebSocket library with support for "wss://" encryption.
+
+You can make a cert/key with openssl using:
+openssl req -new -x509 -days 365 -nodes -out self.pem -keyout self.pem
+as taken from http://docs.python.org/dev/library/ssl.html#certificates
+
+'''
+
+import sys, socket, ssl, traceback
+from base64 import b64encode, b64decode
+
+client_settings = {}
+send_seq = 0
+
+server_handshake = """HTTP/1.1 101 Web Socket Protocol Handshake\r
+Upgrade: WebSocket\r
+Connection: Upgrade\r
+WebSocket-Origin: %s\r
+WebSocket-Location: %s://%s%s\r
+WebSocket-Protocol: sample\r
+\r
+"""
+
+policy_response = """<cross-domain-policy><allow-access-from domain="*" to-ports="*" /></cross-domain-policy>\n"""
+
+def traffic(token="."):
+    sys.stdout.write(token)
+    sys.stdout.flush()
+
+def decode(buf):
+    """ Parse out WebSocket packets. """
+    if buf.count('\xff') > 1:
+        if client_settings["b64encode"]:
+            return [b64decode(d[1:]) for d in buf.split('\xff')]
+        else:
+            # Modified UTF-8 decode
+            return [d[1:].replace("\xc4\x80", "\x00").decode('utf-8').encode('latin-1') for d in buf.split('\xff')]
+    else:
+        if client_settings["b64encode"]:
+            return [b64decode(buf[1:-1])]
+        else:
+            return [buf[1:-1].replace("\xc4\x80", "\x00").decode('utf-8').encode('latin-1')]
+
+def encode(buf):
+    global send_seq
+    if client_settings["b64encode"]:
+        buf = b64encode(buf)
+    else:
+        # Modified UTF-8 encode
+        buf = buf.decode('latin-1').encode('utf-8').replace("\x00", "\xc4\x80")
+
+    if client_settings["seq_num"]:
+        send_seq += 1
+        return "\x00%d:%s\xff" % (send_seq-1, buf)
+    else:
+        return "\x00%s\xff" % buf
+
+
+def do_handshake(sock):
+    global client_settings, send_seq
+    send_seq = 0
+    # Peek, but don't read the data
+    handshake = sock.recv(1024, socket.MSG_PEEK)
+    #print "Handshake [%s]" % repr(handshake)
+    if handshake.startswith("<policy-file-request/>"):
+        handshake = sock.recv(1024)
+        print "Sending flash policy response"
+        sock.send(policy_response)
+        sock.close()
+        return False
+    elif handshake.startswith("\x16"):
+        retsock = ssl.wrap_socket(
+                sock,
+                server_side=True,
+                certfile='self.pem',
+                ssl_version=ssl.PROTOCOL_TLSv1)
+        scheme = "wss"
+        print "Using SSL/TLS"
+    else:
+        retsock = sock
+        scheme = "ws"
+        print "Using plain (not SSL) socket"
+    handshake = retsock.recv(4096)
+    req_lines = handshake.split("\r\n")
+    _, path, _ = req_lines[0].split(" ")
+    _, origin = req_lines[4].split(" ")
+    _, host = req_lines[3].split(" ")
+
+    # Parse settings from the path
+    cvars = path.partition('?')[2].partition('#')[0].split('&')
+    client_settings = {'b64encode': None, 'seq_num': None}
+    for cvar in [c for c in cvars if c]:
+        name, _, value = cvar.partition('=')
+        client_settings[name] = value and value or True
+
+    print "client_settings:", client_settings
+
+    retsock.send(server_handshake % (origin, scheme, host, path))
+    return retsock
+
+def start_server(listen_port, handler):
+    lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    lsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    lsock.bind(('', listen_port))
+    lsock.listen(100)
+    while True:
+        try:
+            csock = None
+            print 'waiting for connection on port %s' % listen_port
+            startsock, address = lsock.accept()
+            print 'Got client connection from %s' % address[0]
+            csock = do_handshake(startsock)
+            if not csock: continue
+
+            handler(csock)
+
+        except Exception:
+            print "Ignoring exception:"
+            print traceback.format_exc()
+            if csock: csock.close()
+