commit c48df422a4eb497d5cc65a77f4d987f3d4999cbf Author: David Fifield <david@bamsoftware.com> Date: Fri Jun 10 03:15:59 2011 -0700 Let swfcat get the relay from the facilitator. --- README | 9 +++++---- design.txt | 6 +++--- swfcat.as | 27 ++++++++++++++------------- 3 files changed, 22 insertions(+), 20 deletions(-) diff --git a/README b/README index 4e58907..b4b1d0e 100644 --- a/README +++ b/README @@ -81,8 +81,8 @@ changing pool of addresses. == Design notes -The Tor relay address is hardcoded in swfcat.as. It could be any relay, -with the caveat that the server also has to serve a crossdomain policy. +Any Tor relay can be used, as long as it also serves a crossdomain +policy. The Tor client needs to be able to listen for an incoming connection, which generally means not being behind NAT. @@ -94,11 +94,12 @@ Clients register with the facilitator by sending an HTTP message: The Flash proxy also gets a client address over HTTP: GET / HTTP/1.0\r\n \r\n -The server sends back an address specification in an HTTP respose. +The server sends back address specifications of a client and a relay in +an HTTP respose. HTTP/1.0 200 OK\r\n Server: BaseHTTP/0.3 Python/2.5.2\r\n \r\n - client=1.2.3.4%3A9000 + client=1.2.3.4%3A9000&relay=9.9.9.9:9001 == ActionScript programming diff --git a/design.txt b/design.txt index abc53a4..27be8ab 100644 --- a/design.txt +++ b/design.txt @@ -128,8 +128,8 @@ Design of Flash proxies 7. Behavior of the Flash proxy The Flash proxy polls the facilitator for client registrations. When - it receives a registration, it opens one connection to a Tor relay, - one to the given client, and begin proxying data between them. + it receives a registration, it opens one connection to the given Tor + relay, one to the given client, and begin proxying data between them. The proxy asks the facilitator for a registration with an HTTP GET request: @@ -139,7 +139,7 @@ Design of Flash proxies The response code is 200 and the body looks like this: - client=[<address>:<port>] + client=[<address>:<port>]&relay=<address>:<port> If <address>:<port> is missing, it means that there are no client registrations for this proxy. diff --git a/swfcat.as b/swfcat.as index 34983ce..8c91ae8 100644 --- a/swfcat.as +++ b/swfcat.as @@ -18,12 +18,6 @@ package public class swfcat extends Sprite { - /* David's relay (nickname 3VXRyxz67OeRoqHn) that also serves a - crossdomain policy. */ - private const DEFAULT_RELAY_ADDR:Object = { - host: "173.255.221.44", - port: 9001 - }; private const DEFAULT_FACILITATOR_ADDR:Object = { host: "tor-facilitator.bamsoftware.com", port: 9002 @@ -43,7 +37,6 @@ package private var output_text:TextField; private var fac_addr:Object; - private var relay_addr:Object; /* Number of proxy pairs currently connected (up to MAX_NUM_PROXY_PAIRS). */ @@ -158,11 +151,6 @@ package puts("Error: Facilitator spec must be in the form \"host:port\"."); return; } - relay_addr = get_param_addr("relay", DEFAULT_RELAY_ADDR); - if (!relay_addr) { - puts("Error: Relay spec must be in the form \"host:port\"."); - return; - } main(); } @@ -213,6 +201,8 @@ package var loader:URLLoader; var client_spec:String; var client_addr:Object; + var relay_spec:String; + var relay_addr:Object; var proxy_pair:Object; setTimeout(main, FACILITATOR_POLL_INTERVAL); @@ -226,13 +216,24 @@ package puts("Error: missing \"client\" in response."); return; } - puts("Facilitator: got \"" + client_spec + "\"."); + relay_spec = loader.data.relay; + if (!relay_spec) { + puts("Error: missing \"relay\" in response."); + return; + } + puts("Facilitator: got client:\"" + client_spec + "\" " + + "relay:\"" + relay_spec + "\"."); client_addr = parse_addr_spec(client_spec); if (!client_addr) { puts("Error: Client spec must be in the form \"host:port\"."); return; } + relay_addr = parse_addr_spec(relay_spec); + if (!client_addr) { + puts("Error: Relay spec must be in the form \"host:port\"."); + return; + } num_proxy_pairs++; total_proxy_pairs++;