commit cb5640e7a478cebac59e91144e69992d5593d490 Author: David Fifield david@bamsoftware.com Date: Sat Mar 31 17:45:58 2012 -0700

Remove *.as files. --- Makefile | 14 +-- ProxyPair.as | 194 -------------------- swfcat.as | 566 ---------------------------------------------------------- 3 files changed, 3 insertions(+), 771 deletions(-)

diff --git a/Makefile b/Makefile index 61c3901..94c5d1f 100644 --- a/Makefile +++ b/Makefile @@ -1,23 +1,15 @@ PREFIX = /usr/local BINDIR = $(PREFIX)/bin

-MXMLC ?= mxmlc - -TARGETS = swfcat.swf - -all: $(TARGETS) - -swfcat.swf: *.as badge.png - -%.swf: %.as - $(MXMLC) -output $@ -static-link-runtime-shared-libraries $< +all: + :

install: mkdir -p $(BINDIR) cp -f connector.py facilitator.py $(BINDIR)

clean: - rm -f $(TARGETS) + :

test: ./connector-test.py diff --git a/ProxyPair.as b/ProxyPair.as deleted file mode 100644 index 237ab69..0000000 --- a/ProxyPair.as +++ /dev/null @@ -1,194 +0,0 @@ -package -{ - import flash.events.Event; - import flash.events.EventDispatcher; - import flash.events.IOErrorEvent; - import flash.events.ProgressEvent; - import flash.events.SecurityErrorEvent; - import flash.events.TextEvent; - import flash.net.Socket; - import flash.utils.ByteArray; - import flash.utils.clearTimeout; - import flash.utils.setTimeout; - - /* An instance of a client-relay connection. */ - public class ProxyPair extends EventDispatcher - { - // Label for log messages. - public var name:String; - - // Socket to client. - private var s_c:*; - private var connect_c:Function; - - // Socket to relay. - private var s_r:*; - private var connect_r:Function; - - // Parent swfcat, for UI updates and rate meter. - private var ui:swfcat; - - // Pending byte read counts for relay and client sockets. - private var r2c_schedule:Array; - private var c2r_schedule:Array; - // Callback id. - private var flush_id:uint; - - public function log(msg:String):void - { - if (name) - ui.puts(name + ": " + msg) - else - ui.puts(msg) - } - - public function logdebug(msg:String):void - { - if (ui.debug) - log(msg); - } - - public function set_name(name:String):void - { - this.name = name; - } - - public function ProxyPair(ui:swfcat, s_c:*, connect_c:Function, s_r:*, connect_r:Function) - { - this.ui = ui; - /* s_c is a socket for connecting to the client. connect_c is a - function that, when called, connects s_c. Likewise for s_r and - connect_r. */ - this.s_c = s_c; - this.connect_c = connect_c; - this.s_r = s_r; - this.connect_r = connect_r; - - this.c2r_schedule = []; - this.r2c_schedule = []; - } - - /* Return a function that shows an error message and closes the other half - of a communication pair. */ - private function socket_error(message:String, other:*):Function - { - return function(e:Event):void { - if (e is TextEvent) - log(message + ": " + (e as TextEvent).text + "."); - else - log(message + "."); - if (other && other.connected) - other.close(); - dispatchEvent(new Event(Event.COMPLETE)); - }; - } - - public function connect():void - { - s_r.addEventListener(Event.CONNECT, relay_connected); - s_r.addEventListener(Event.CLOSE, relay_closed); - s_r.addEventListener(IOErrorEvent.IO_ERROR, socket_error("Relay: I/O error", s_c)); - s_r.addEventListener(SecurityErrorEvent.SECURITY_ERROR, socket_error("Relay: security error", s_c)); - s_r.addEventListener(ProgressEvent.SOCKET_DATA, relay_to_client); - - s_c.addEventListener(Event.CONNECT, client_connected); - s_c.addEventListener(Event.CLOSE, client_closed); - s_c.addEventListener(IOErrorEvent.IO_ERROR, socket_error("Client: I/O error", s_r)); - s_c.addEventListener(SecurityErrorEvent.SECURITY_ERROR, socket_error("Client: security error", s_r)); - s_c.addEventListener(ProgressEvent.SOCKET_DATA, client_to_relay); - - log("Relay: connecting."); - connect_r(); - log("Client: connecting."); - connect_c(); - } - - private function relay_connected(e:Event):void - { - log("Relay: connected."); - } - - private function client_connected(e:Event):void - { - log("Client: connected."); - } - - private function relay_closed(e:Event):void - { - log("Relay: closed."); - flush(); - } - - private function client_closed(e:Event):void - { - log("Client: closed."); - flush(); - } - - private function relay_to_client(e:ProgressEvent):void - { - r2c_schedule.push(e.bytesLoaded); - flush(); - } - - private function client_to_relay(e:ProgressEvent):void - { - c2r_schedule.push(e.bytesLoaded); - flush(); - } - - private function transfer_chunk(s_from:*, s_to:*, n:uint, - label:String):void - { - var bytes:ByteArray; - - bytes = new ByteArray(); - s_from.readBytes(bytes, 0, n); - s_to.writeBytes(bytes); - s_to.flush(); - ui.rate_limit.update(n); - logdebug(label + ": read " + bytes.length + "."); - } - - /* Send as much data as the rate limit currently allows. */ - private function flush():void - { - var busy:Boolean; - - if (flush_id) - clearTimeout(flush_id); - flush_id = undefined; - - if (!s_r.connected && !s_c.connected) - /* Can't do anything while both sockets are disconnected. */ - return; - - busy = true; - while (busy && !ui.rate_limit.is_limited()) { - busy = false; - if (s_c.connected && r2c_schedule.length > 0) { - transfer_chunk(s_r, s_c, r2c_schedule.shift(), "Relay"); - busy = true; - } - if (s_r.connected && c2r_schedule.length > 0) { - transfer_chunk(s_c, s_r, c2r_schedule.shift(), "Client"); - busy = true; - } - } - - if (!s_r.connected && r2c_schedule.length == 0) { - log("Client: closing."); - s_c.close(); - } - if (!s_c.connected && c2r_schedule.length == 0) { - log("Relay: closing."); - s_r.close(); - } - - if (!s_c.connected && !s_r.connected) - dispatchEvent(new Event(Event.COMPLETE)); - else if (r2c_schedule.length > 0 || c2r_schedule.length > 0) - flush_id = setTimeout(flush, ui.rate_limit.when() * 1000); - } - } -} diff --git a/swfcat.as b/swfcat.as deleted file mode 100644 index 13d8788..0000000 --- a/swfcat.as +++ /dev/null @@ -1,566 +0,0 @@ -/* Flash parameters. These can change how the program runs from the outside. - * They can be set as a URL query string, for example: - * http://www.example.com/swfcat.swf?facilitator=127.0.0.1:9002&debug=1 - * or in the HTML markup for the embedding of the movie: - * <object> - * <param name="movie" value="http://www.example.com/swfcat.swf"> - * <param name="flashvars" value="facilitator=127.0.0.1:9002&debug=1"> - * <embed src="http://www.example.com/swfcat.swf" - * flashvars="facilitator=127.0.0.1:9002&debug=1"></embed> - * </object> - * - * debug=1 - * If set (to any value), show verbose terminal-like output instead of the - * badge. - * - * facilitator=<HOST>:<PORT> - * The address of the facilitator to use. By default it is - * DEFAULT_FACILITATOR_ADDR. Both <HOST> and <PORT> must be present. - * - * max_clients=<NUM> - * How many clients to serve concurrently. The default is - * DEFAULT_MAX_NUM_PROXY_PAIRS. - * - * facilitator_poll_interval=<FLOAT> - * How often to poll the facilitator, in seconds. The default is - * DEFAULT_FACILITATOR_POLL_INTERVAL. There is a sanity-check minimum of 1.0 s. - * - * ratelimit=<FLOAT>(<UNIT>)?|off - * What rate to limit all proxy traffic combined to. The special value "off" - * disables the limit. The default is DEFAULT_RATE_LIMIT. There is a - * sanity-check minimum of "10K". - */ - -package -{ - import flash.display.Sprite; - import flash.display.StageAlign; - import flash.display.StageScaleMode; - import flash.events.Event; - import flash.events.IOErrorEvent; - import flash.events.SecurityErrorEvent; - import flash.external.ExternalInterface; - import flash.net.Socket; - import flash.net.URLLoader; - import flash.net.URLLoaderDataFormat; - import flash.net.URLRequest; - import flash.net.URLRequestMethod; - import flash.net.URLVariables; - import flash.text.TextField; - import flash.text.TextFormat; - import flash.utils.setTimeout; - - public class swfcat extends Sprite - { - private const DEFAULT_FACILITATOR_ADDR:Object = { - host: "tor-facilitator.bamsoftware.com", - port: 9002 - }; - - private const DEFAULT_MAX_NUM_PROXY_PAIRS:uint = 10; - - /* In seconds. */ - private const DEFAULT_FACILITATOR_POLL_INTERVAL:Number = 10.0; - private const MIN_FACILITATOR_POLL_INTERVAL:Number = 1.0; - - // Bytes per second. Set to undefined to disable limit. - public static const DEFAULT_RATE_LIMIT:Number = undefined; - public static const MIN_RATE_LIMIT:Number = 10 * 1024; - // Seconds. - private static const RATE_LIMIT_HISTORY:Number = 5.0; - - /* TextField for debug output. */ - private var output_text:TextField; - - /* UI shown when debug is off. */ - private var badge:Badge; - - /* Proxy pairs currently connected (up to max_num_proxy_pairs). */ - private var proxy_pairs:Array; - - public var debug:Boolean; - private var fac_addr:Object; - private var max_num_proxy_pairs:uint; - private var facilitator_poll_interval:Number; - - public var rate_limit:RateLimit; - - public function puts(s:String):void - { - if (output_text) { - output_text.appendText(s + "\n"); - output_text.scrollV = output_text.maxScrollV; - } - } - - public function swfcat() - { - // Absolute positioning. - stage.scaleMode = StageScaleMode.NO_SCALE; - stage.align = StageAlign.TOP_LEFT; - - badge = new Badge(); - - proxy_pairs = []; - - // Wait until the query string parameters are loaded. - this.loaderInfo.addEventListener(Event.COMPLETE, loaderinfo_complete); - } - - private function loaderinfo_complete(e:Event):void - { - var tmp:*; - - debug = this.loaderInfo.parameters["debug"]; - - if (debug) { - output_text = new TextField(); - output_text.width = stage.stageWidth; - output_text.height = stage.stageHeight; - output_text.background = true; - output_text.backgroundColor = 0x001f0f; - output_text.textColor = 0x44cc44; - addChild(output_text); - } else { - addChild(badge); - } - - puts("Parameters loaded."); - - fac_addr = get_param_addr("facilitator", DEFAULT_FACILITATOR_ADDR); - if (!fac_addr) { - puts("Error: Facilitator spec must be in the form "host:port"."); - return; - } - - tmp = get_param_number("max_clients", DEFAULT_MAX_NUM_PROXY_PAIRS); - if (tmp == null || tmp < 0) { - puts("Error: max_clients must be a nonnegative integer."); - return; - } - max_num_proxy_pairs = uint(tmp); - - tmp = get_param_timespec("facilitator_poll_interval", DEFAULT_FACILITATOR_POLL_INTERVAL); - if (tmp == null || tmp < MIN_FACILITATOR_POLL_INTERVAL) { - puts("Error: facilitator_poll_interval must be a nonnegative number at least " + MIN_FACILITATOR_POLL_INTERVAL + "."); - return; - } - facilitator_poll_interval = Number(tmp); - - if (this.loaderInfo.parameters["ratelimit"] == "off") - tmp = undefined; - else - tmp = get_param_byte_count("ratelimit", DEFAULT_RATE_LIMIT); - if (tmp === undefined) { - /* No rate limit. */ - } else if (tmp == null || tmp < MIN_FACILITATOR_POLL_INTERVAL) { - puts("Error: ratelimit must be a nonnegative number at least " + MIN_RATE_LIMIT + "."); - return; - } - if (tmp) - rate_limit = new BucketRateLimit(Number(tmp) * RATE_LIMIT_HISTORY, RATE_LIMIT_HISTORY); - else - rate_limit = new RateUnlimit(); - - proxy_main(); - } - - /* Get an address structure from the given movie parameter, or the given - default. Returns null on error. */ - private function get_param_addr(param:String, default_addr:Object):Object - { - var spec:String; - - spec = this.loaderInfo.parameters[param]; - if (spec) - return parse_addr_spec(spec); - else - return default_addr; - } - - /* Get a number from the given movie parameter, or the given default. - Returns null on error. First check for a null return, and then call - uint or whatever on the return value if no error. */ - private function get_param_number(param:String, default_val:Number):Object - { - var spec:String; - var val:Number; - - spec = this.loaderInfo.parameters[param]; - if (spec) { - val = Number(spec); - if (isNaN(val)) - return null; - else - return val; - } else { - return default_val; - } - } - - /* Get a floating-point number of seconds from a time specification. The - only time specification format is a decimal number of seconds. - Returns null on error. */ - private function get_param_timespec(param:String, default_val:Number):Object - { - return get_param_number(param, default_val); - } - - /* Get a count of bytes from a string specification like "100" or - "1.3m". Returns null on error. */ - private function get_param_byte_count(param:String, default_val:Number):Object - { - var spec:String; - - spec = this.loaderInfo.parameters[param]; - if (spec) - return parse_byte_count(spec); - else - return default_val; - } - - /* The main logic begins here, after start-up issues are taken care of. */ - private function proxy_main():void - { - var fac_url:String; - var loader:URLLoader; - - if (proxy_pairs.length >= max_num_proxy_pairs) { - setTimeout(proxy_main, uint(facilitator_poll_interval * 1000)); - return; - } - - loader = new URLLoader(); - /* Get the x-www-form-urlencoded values. */ - loader.dataFormat = URLLoaderDataFormat.VARIABLES; - loader.addEventListener(Event.COMPLETE, fac_complete); - loader.addEventListener(IOErrorEvent.IO_ERROR, function (e:IOErrorEvent):void { - puts("Facilitator: I/O error: " + e.text + "."); - }); - loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, function (e:SecurityErrorEvent):void { - puts("Facilitator: security error: " + e.text + "."); - }); - - fac_url = "http://" + encodeURIComponent(fac_addr.host) - + ":" + encodeURIComponent(fac_addr.port) + "/"; - puts("Facilitator: connecting to " + fac_url + "."); - loader.load(new URLRequest(fac_url)); - } - - private function fac_complete(e:Event):void - { - var loader:URLLoader; - var client_spec:String; - var relay_spec:String; - var proxy_pair:Object; - - setTimeout(proxy_main, uint(facilitator_poll_interval * 1000)); - - loader = e.target as URLLoader; - client_spec = loader.data.client; - if (client_spec == "") { - puts("No clients."); - return; - } else if (!client_spec) { - puts("Error: missing "client" in response."); - return; - } - relay_spec = loader.data.relay; - if (!relay_spec) { - puts("Error: missing "relay" in response."); - return; - } - puts("Facilitator: got client:"" + client_spec + "" " - + "relay:"" + relay_spec + ""."); - - try { - proxy_pair = make_proxy_pair(client_spec, relay_spec); - } catch (e:ArgumentError) { - puts("Error: " + e); - return; - } - proxy_pairs.push(proxy_pair); - proxy_pair.addEventListener(Event.COMPLETE, function(e:Event):void { - proxy_pair.log("Complete."); - /* Delete from the list of active proxy pairs. */ - proxy_pairs.splice(proxy_pairs.indexOf(proxy_pair), 1); - badge.proxy_end(); - }); - proxy_pair.connect(); - - badge.proxy_begin(); - } - - private function make_proxy_pair(client_spec:String, relay_spec:String):ProxyPair - { - var proxy_pair:ProxyPair; - var addr_c:Object; - var addr_r:Object; - var s_c:*; - var s_r:Socket; - - addr_r = swfcat.parse_addr_spec(relay_spec); - if (!addr_r) - throw new ArgumentError("Relay spec must be in the form "host:port"."); - - addr_c = swfcat.parse_addr_spec(client_spec); - if (addr_c) { - s_c = new Socket(); - s_r = new Socket(); - proxy_pair = new ProxyPair(this, s_c, function ():void { - s_c.connect(addr_c.host, addr_c.port); - }, s_r, function ():void { - s_r.connect(addr_r.host, addr_r.port); - }); - proxy_pair.set_name("<" + addr_c.host + ":" + addr_c.port + "," - + addr_r.host + ":" + addr_r.port + ">"); - return proxy_pair; - } - - throw new ArgumentError("Can't parse client spec "" + client_spec + ""."); - } - - /* Parse an address in the form "host:port". Returns an Object with - keys "host" (String) and "port" (int). Returns null on error. */ - private static function parse_addr_spec(spec:String):Object - { - var parts:Array; - var addr:Object; - - parts = spec.split(":", 2); - if (parts.length != 2 || !parseInt(parts[1])) - return null; - addr = {} - addr.host = parts[0]; - addr.port = parseInt(parts[1]); - - return addr; - } - - /* Parse a count of bytes. A suffix of "k", "m", or "g" (or uppercase) - does what you would think. Returns null on error. */ - private static function parse_byte_count(spec:String):Object - { - const UNITS:Object = { - k: 1024, m: 1024 * 1024, g: 1024 * 1024 * 1024, - K: 1024, M: 1024 * 1024, G: 1024 * 1024 * 1024 - }; - var count:Number, units:Object; - var matches:Array; - - matches = spec.match(/^(\d+(?:.\d*)?)(\w*)$/); - if (matches == null) - return null; - - count = Number(matches[1]); - if (isNaN(count)) - return null; - - if (matches[2] == "") { - units = 1; - } else { - units = UNITS[matches[2]]; - if (units == null) - return null; - } - - return count * Number(units); - } - } -} - -import flash.events.MouseEvent; -import flash.net.navigateToURL; -import flash.net.URLRequest; -import flash.text.TextField; -import flash.text.TextFormat; -import flash.utils.getTimer; - -class Badge extends flash.display.Sprite -{ - private const FLASHPROXY_INFO_URL:String = "https://crypto.stanford.edu/flashproxy/"; - - /* Number of proxy pairs currently connected. */ - private var num_proxy_pairs:int = 0; - /* Number of proxy pairs ever connected. */ - private var total_proxy_pairs:int = 0; - - [Embed(source="badge.png")] - private var BadgeImage:Class; - private var tot_client_count_tf:TextField; - private var tot_client_count_fmt:TextFormat; - private var cur_client_count_tf:TextField; - private var cur_client_count_fmt:TextFormat; - - public function Badge() - { - /* Setup client counter for badge. */ - tot_client_count_fmt = new TextFormat(); - tot_client_count_fmt.color = 0xFFFFFF; - tot_client_count_fmt.align = "center"; - tot_client_count_fmt.font = "courier-new"; - tot_client_count_fmt.bold = true; - tot_client_count_fmt.size = 10; - tot_client_count_tf = new TextField(); - tot_client_count_tf.width = 20; - tot_client_count_tf.height = 17; - tot_client_count_tf.background = false; - tot_client_count_tf.defaultTextFormat = tot_client_count_fmt; - tot_client_count_tf.x=47; - tot_client_count_tf.y=0; - - cur_client_count_fmt = new TextFormat(); - cur_client_count_fmt.color = 0xFFFFFF; - cur_client_count_fmt.align = "center"; - cur_client_count_fmt.font = "courier-new"; - cur_client_count_fmt.bold = true; - cur_client_count_fmt.size = 10; - cur_client_count_tf = new TextField(); - cur_client_count_tf.width = 20; - cur_client_count_tf.height = 17; - cur_client_count_tf.background = false; - cur_client_count_tf.defaultTextFormat = cur_client_count_fmt; - cur_client_count_tf.x=47; - cur_client_count_tf.y=6; - - addChild(new BadgeImage()); - addChild(tot_client_count_tf); - addChild(cur_client_count_tf); - - /* Update the client counter on badge. */ - update_client_count(); - - addEventListener(MouseEvent.CLICK, mouse_clicked); - } - - public function proxy_begin():void - { - num_proxy_pairs++; - total_proxy_pairs++; - update_client_count(); - } - - public function proxy_end():void - { - num_proxy_pairs--; - update_client_count(); - } - - private function update_client_count():void - { - /* Update total client count. */ - if (String(total_proxy_pairs).length == 1) - tot_client_count_tf.text = "0" + String(total_proxy_pairs); - else - tot_client_count_tf.text = String(total_proxy_pairs); - - /* Update current client count. */ - cur_client_count_tf.text = ""; - for(var i:Number = 0; i < num_proxy_pairs; i++) - cur_client_count_tf.appendText("."); - } - - /* Show a web page with detailed information when the badge is clicked. */ - private function mouse_clicked(e:MouseEvent):void - { - try { - navigateToURL(new URLRequest(FLASHPROXY_INFO_URL)); - } catch (err:Error) { - } - } -} - -class RateLimit -{ - public function RateLimit() - { - } - - public function update(n:Number):Boolean - { - return true; - } - - public function when():Number - { - return 0.0; - } - - public function is_limited():Boolean - { - return false; - } -} - -class RateUnlimit extends RateLimit -{ - public function RateUnlimit() - { - } - - public override function update(n:Number):Boolean - { - return true; - } - - public override function when():Number - { - return 0.0; - } - - public override function is_limited():Boolean - { - return false; - } -} - -class BucketRateLimit extends RateLimit -{ - private var amount:Number; - private var capacity:Number; - private var time:Number; - private var last_update:uint; - - public function BucketRateLimit(capacity:Number, time:Number) - { - this.amount = 0.0; - /* capacity / time is the rate we are aiming for. */ - this.capacity = capacity; - this.time = time; - this.last_update = getTimer(); - } - - private function age():void - { - var now:uint; - var delta:Number; - - now = getTimer(); - delta = (now - last_update) / 1000.0; - last_update = now; - - amount -= delta * capacity / time; - if (amount < 0.0) - amount = 0.0; - } - - public override function update(n:Number):Boolean - { - age(); - amount += n; - - return amount <= capacity; - } - - public override function when():Number - { - age(); - return (amount - capacity) / (capacity / time); - } - - public override function is_limited():Boolean - { - age(); - return amount > capacity; - } -}