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more transit-relay work

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This commit is contained in:
Brian Warner 2015-03-01 11:33:16 -08:00
parent cd54eff994
commit dc8d6e979f
1 changed files with 23 additions and 13 deletions
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36
src/wormhole/blocking/transit.py
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@ -45,6 +45,9 @@ def build_sender_handshake(key):
hexid = HKDF(key, 32, CTXinfo=b"transit_sender")
return "transit sender %s ready\n\n" % hexlify(hexid)
def build_relay_token(key):
return "PLEASE RELAY\n"
TIMEOUT=15
# 1: sender only transmits, receiver only accepts, both wait forever
@ -62,7 +65,16 @@ def force_ascii(s):
return s.encode("ascii")
return s
def connector(owner, hint, send_handshake, expected_handshake):
def wait_for(skt, expected, hint):
got = b""
while len(got) < len(expected):
got += skt.recv(1)
if expected[:len(got)] != got:
raise BadHandshake("got '%r' want '%r' on %s" %
(got, expected, hint))
def connector(owner, hint, send_handshake, expected_handshake,
relay_token=None):
addr,port = hint.split(",")
skt = None
try:
@ -70,13 +82,11 @@ def connector(owner, hint, send_handshake, expected_handshake):
TIMEOUT) # timeout or ECONNREFUSED
skt.settimeout(TIMEOUT)
#print("socket(%s) connected" % (hint,))
if relay_token:
skt.send(relay_token)
wait_for(skt, "ok\n", hint)
skt.send(send_handshake)
got = b""
while len(got) < len(expected_handshake):
got += skt.recv(1)
if expected_handshake[:len(got)] != got:
raise BadHandshake("got '%r' want '%r' on %s" %
(got, expected_handshake, hint))
wait_for(skt, expected_handshake, hint)
#print("connector ready %r" % (hint,))
except Exception as e:
try:
@ -208,17 +218,17 @@ class Common:
if not self._their_direct_hints:
self._start_relay_connectors()
def _start_connector(self, hint):
t = threading.Thread(target=connector,
args=(self, hint,
self._send_this(),
self._expect_this()))
def _start_connector(self, hint, is_relay=False):
args = (self, hint, self._send_this(), self._expect_this())
if is_relay:
args = args + (build_relay_token(self._transit_key),)
t = threading.Thread(target=connector, args=args)
t.daemon = True
t.start()
def _start_relay_connectors(self):
for hint in self._their_relay_hints:
self._start_connector(hint)
self._start_connector(hint, is_relay=True)
def establish_connection(self):
self.winning_skt = None