mirror of
https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake.git
synced 2025-10-13 11:11:30 -04:00
successful bootstrap through browser proxy! (closes #5)
This commit is contained in:
Serene Han
parent
a8477ee402
commit
9c4fc24719
2 changed files with 64 additions and 41 deletions
12
proxy/lib/coffee-script.js
Normal file
12
proxy/lib/coffee-script.js
Normal file
File diff suppressed because one or more lines are too long
|
|
@ -6,11 +6,9 @@ Uses WebRTC from the client, and websocket to the server.
|
|||
|
||||
Assume that the webrtc client plugin is always the offerer, in which case
|
||||
this must always act as the answerer.
|
||||
|
||||
TODO(keroserene): Complete the websocket + webrtc ProxyPair
|
||||
###
|
||||
|
||||
DEFAULT_WEBSOCKET = '92.81.135.242:9901'
|
||||
DEFAULT_WEBSOCKET = '192.81.135.242:9901'
|
||||
|
||||
if 'undefined' != typeof module && 'undefined' != typeof module.exports
|
||||
console.log 'not in browser.'
|
||||
|
|
@ -99,19 +97,6 @@ Params =
|
|||
return null
|
||||
{ host: host, port: port }
|
||||
|
||||
# repr = (x) ->
|
||||
# return 'null' if null == x
|
||||
# return 'undefined' if 'undefined' == typeof x
|
||||
# if 'object' == typeof x
|
||||
# elems = []
|
||||
# for k in x
|
||||
# elems.push(maybe_quote(k) + ': ' + repr(x[k]));
|
||||
# return '{ ' + elems.join(', ') + ' }';
|
||||
# } else if (typeof x === 'string') {
|
||||
# return quote(x);
|
||||
# } else {
|
||||
# return x.toString();
|
||||
# safe_repr = (s) -> SAFE_LOGGING ? '[scrubbed]' : repr(s)
|
||||
safe_repr = (s) -> SAFE_LOGGING ? '[scrubbed]' : JSON.stringify(s)
|
||||
|
||||
# HEADLESS is true if we are running not in a browser with a DOM.
|
||||
|
|
@ -120,6 +105,7 @@ if window && window.location
|
|||
query = Query.parse(window.location.search.substr(1))
|
||||
DEBUG = Params.getBool(query, 'debug', false)
|
||||
HEADLESS = 'undefined' == typeof(document)
|
||||
RATE_LIMIT_HISTORY = 5.0
|
||||
|
||||
DEFAULT_PORTS =
|
||||
http: 80
|
||||
|
|
@ -177,6 +163,33 @@ makeWebsocket = (addr) ->
|
|||
ws.binaryType = 'arraybuffer'
|
||||
ws
|
||||
|
||||
class BucketRateLimit
|
||||
amount: 0.0
|
||||
last_update: new Date()
|
||||
|
||||
constructor: (@capacity, @time) ->
|
||||
|
||||
age: ->
|
||||
now = new Date()
|
||||
delta = (now - @last_update) / 1000.0
|
||||
@last_update = now
|
||||
@amount -= delta * @capacity / @time
|
||||
@amount = 0.0 if @amount < 0.0
|
||||
|
||||
update: (n) ->
|
||||
@age()
|
||||
@amount += n
|
||||
@amount <= @capacity
|
||||
|
||||
# How many seconds in the future will the limit expire?
|
||||
when: ->
|
||||
age()
|
||||
(@amount - @capacity) / (@capacity / @time)
|
||||
|
||||
is_limited: ->
|
||||
@age()
|
||||
@amount > @capacity
|
||||
|
||||
# TODO: Different ICE servers.
|
||||
config = {
|
||||
iceServers: [
|
||||
|
|
@ -224,6 +237,8 @@ class Snowflake
|
|||
@badge = new Badge()
|
||||
@$badgem = @badge.elem
|
||||
@$badge.setAttribute('id', 'snowflake-badge') if (@$badge)
|
||||
rateLimitBytes = 0
|
||||
@rateLimit = new BucketRateLimit(rateLimitBytes * RATE_LIMIT_HISTORY, RATE_LIMIT_HISTORY);
|
||||
|
||||
# TODO: User-supplied for now, but should fetch from facilitator later.
|
||||
setRelayAddr: (relayAddr) ->
|
||||
|
|
@ -302,7 +317,6 @@ class Snowflake
|
|||
@cease()
|
||||
@badge.die() if @badge
|
||||
|
||||
|
||||
###
|
||||
Represents: client <-- webrtc --> snowflake <-- websocket --> relay
|
||||
###
|
||||
|
|
@ -317,10 +331,8 @@ class ProxyPair
|
|||
flush_timeout_id: null
|
||||
|
||||
constructor: (@clientAddr, @relayAddr, @rateLimit) ->
|
||||
@c2rSchedule = []
|
||||
@r2cSchedule = []
|
||||
|
||||
connectClient: ->
|
||||
connectClient: =>
|
||||
@pc = new PeerConnection config, {
|
||||
optional: [
|
||||
{ DtlsSrtpKeyAgreement: true }
|
||||
|
|
@ -342,7 +354,7 @@ class ProxyPair
|
|||
@prepareDataChannel channel
|
||||
@client = channel
|
||||
|
||||
prepareDataChannel: (channel) ->
|
||||
prepareDataChannel: (channel) =>
|
||||
channel.onopen = =>
|
||||
log 'Data channel opened!'
|
||||
snowflake.state = MODE.WEBRTC_READY
|
||||
|
|
@ -358,12 +370,12 @@ class ProxyPair
|
|||
channel.onmessage = @onClientToRelayMessage
|
||||
|
||||
# Assumes WebRTC datachannel is connected.
|
||||
connectRelay: ->
|
||||
connectRelay: =>
|
||||
log 'Connecting to relay...'
|
||||
@relay = makeWebsocket @relayAddr
|
||||
@relay.label = 'websocket-relay'
|
||||
@relay.onopen = =>
|
||||
log 'Relay ' + @relay.label + 'connected'
|
||||
log '\nRelay ' + @relay.label + ' connected!'
|
||||
@relay.onclose = @onClose
|
||||
@relay.onerror = @onError
|
||||
@relay.onmessage = @onRelayToClientMessage
|
||||
|
|
@ -377,14 +389,14 @@ class ProxyPair
|
|||
bytes = new Uint8Array recv
|
||||
line = String.fromCharCode.apply(null, bytes)
|
||||
line = line.trim()
|
||||
log 'WebRTC-->websocket data: ' + line
|
||||
console.log 'WebRTC --> websocket data: ' + line
|
||||
@c2rSchedule.push recv
|
||||
@flush()
|
||||
|
||||
# websocket --> WebRTC
|
||||
onRelayToClientMessage: (event) =>
|
||||
@r2cSchedule.push event.data
|
||||
log 'websocket-->WebRTC data: ' + event.data
|
||||
# log 'websocket-->WebRTC data: ' + event.data
|
||||
@flush()
|
||||
|
||||
onClose: (event) =>
|
||||
|
|
@ -403,42 +415,43 @@ class ProxyPair
|
|||
@maybeCleanup()
|
||||
|
||||
webrtcIsReady: -> null != @client && 'open' == @client.readyState
|
||||
isOpen: (ws) -> undefined != ws && WebSocket.OPEN == ws.readyState
|
||||
relayIsReady: -> (null != @relay) && (WebSocket.OPEN == @relay.readyState)
|
||||
isClosed: (ws) -> undefined == ws || WebSocket.CLOSED == ws.readyState
|
||||
close: ->
|
||||
@client.close() if !(isClosed @client)
|
||||
@relay.close() if !(isClosed @relay)
|
||||
|
||||
maybeCleanup: ->
|
||||
if @running && @isClosed(client) && @isClosed @relay
|
||||
maybeCleanup: =>
|
||||
if @running && @isClosed @relay
|
||||
@running = false
|
||||
@cleanup_callback()
|
||||
# TODO: Call external callback
|
||||
true
|
||||
false
|
||||
|
||||
# Send as much data as the rate limit currently allows.
|
||||
flush: ->
|
||||
flush: =>
|
||||
clearTimeout @flush_timeout_id if @flush_timeout_id
|
||||
@flush_timeout_id = null
|
||||
busy = true
|
||||
checkChunks = =>
|
||||
busy = false
|
||||
# WebRTC --> websocket
|
||||
if @relayIsReady() && @relay.bufferedAmount < @MAX_BUFFER && @c2rSchedule.length > 0
|
||||
chunk = @c2rSchedule.shift()
|
||||
# @rate_limit.update chunk.length
|
||||
@relay.send chunk
|
||||
busy = true
|
||||
# websocket --> WebRTC
|
||||
if @webrtcIsReady() && @client.bufferedAmount < @MAX_BUFFER && @r2cSchedule.length > 0
|
||||
chunk = @r2cSchedule.shift()
|
||||
# this.rate_limit.update(chunk.length)
|
||||
@client.send chunk
|
||||
busy = true
|
||||
# WebRTC --> websocket
|
||||
if (@isOpen @relay) && (@relay.bufferedAmount < @MAX_BUFFER) && @c2rSchedule.length > 0
|
||||
chunk = @c2rSchedule.shift()
|
||||
# @rate_limit.update chunk.length
|
||||
@relay.send chunk
|
||||
busy = true
|
||||
checkChunks() while busy # && !@rate_limit.is_limited()
|
||||
|
||||
# TODO: rate limiting stuff
|
||||
# if @r2cSchedule.length > 0 || (@client) && @client.bufferedAmount > 0) || @c2rSchedule.length > 0 || (@isOpen(@relay) && @relay.bufferedAmount > 0)
|
||||
# TODO: a more real rate limit
|
||||
if @r2cSchedule.length > 0 || @c2rSchedule.length > 0 || (@relayIsReady() && @relay.bufferedAmount > 0) || (@webrtcIsReady() && @client.bufferedAmount > 0)
|
||||
@flush_timeout_id = setTimeout @flush, 1000
|
||||
# @flush_timeout_id = setTimeout @flush, @rate_limit.when() * 1000
|
||||
|
||||
#
|
||||
|
|
@ -472,9 +485,6 @@ Interface =
|
|||
Signalling.receive msg
|
||||
when MODE.WEBRTC_READY
|
||||
log 'No input expected - WebRTC connected.'
|
||||
# data = msg
|
||||
# log(data)
|
||||
# channel.send(data)
|
||||
else
|
||||
log 'ERROR: ' + msg
|
||||
$input.value = ''
|
||||
|
|
@ -515,6 +525,7 @@ init = ->
|
|||
if 13 == e.keyCode # enter
|
||||
$send.onclick()
|
||||
snowflake = new Snowflake()
|
||||
window.snowflake = snowflake
|
||||
welcome()
|
||||
|
||||
window.onload = init if window
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue