commit bdc5bab098747af3e6e56ecd37fae2bc13b4f343 Author: Cecylia Bocovich cohosh@torproject.org Date: Mon Jan 17 18:56:47 2022 -0500

Close peer connection for NAT check

Make sure we close the data channel and peer connection created for our NAT check, regardless of the outcome. --- util.js | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/util.js b/util.js index adaef30..710ad51 100644 --- a/util.js +++ b/util.js @@ -21,29 +21,31 @@ class Util { return navigator.cookieEnabled; }

- // returns a promise that fullfills to "restricted" if we + // returns a promise that resolves to "restricted" if we // fail to make a test connection to a known restricted - // NAT, "unrestricted" if the test connection fails, and + // NAT, "unrestricted" if the test connection succeeds, and // "unknown" if we fail to reach the probe test server static checkNATType(timeout) { - return new Promise((fulfill, reject) => { + let pc = new RTCPeerConnection({iceServers: [ + {urls: 'stun:stun1.l.google.com:19302'} + ]}); + let channel = pc.createDataChannel("NAT test"); + return (new Promise((fulfill, reject) => { let open = false; - let pc = new RTCPeerConnection({iceServers: [ - {urls: 'stun:stun1.l.google.com:19302'} - ]}); - let channel = pc.createDataChannel("NAT test"); channel.onopen = function() { open = true; fulfill("unrestricted"); - channel.close(); - pc.close(); }; pc.onicecandidate = (evt) => { if (evt.candidate == null) { //ice gathering is finished Util.sendOffer(pc.localDescription) .then((answer) => { - setTimeout(() => {if(!open) fulfill("restricted");}, timeout); + setTimeout(() => { + if(!open) { + fulfill("restricted"); + } + }, timeout); pc.setRemoteDescription(JSON.parse(answer)); }).catch((e) => { console.log(e); @@ -57,7 +59,10 @@ class Util { console.log(e); reject("Error creating offer for probetest"); }); - }); + }).finally(() => { + channel.close(); + pc.close(); + })); }

// Assumes getClientOffer happened, and a WebRTC SDP answer has been generated.