[tor-commits] [snowflake-webext/master] Set NAT type to restricted after 3 failed connects

[cohosh@xxxxxxxxxxxxxx]

commit 8bc32f580791c80a671cdb0a22ff56bbb4f244fb
Author: Cecylia Bocovich <cohosh@xxxxxxxxxxxxxx>
Date:   Thu Jan 21 10:20:50 2021 -0500

    Set NAT type to restricted after 3 failed connects
    
    Only set the NAT type to restricted after we fail to connect to a
    restricted client 3 times in a row.
---
 snowflake.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/snowflake.js b/snowflake.js
index 1937fdb..091e046 100644
--- a/snowflake.js
+++ b/snowflake.js
@@ -23,6 +23,7 @@ class Snowflake {
     this.broker = broker;
     this.broker.setNATType(ui.natType);
     this.proxyPairs = [];
+    this.natFailures = 0;
     this.pollInterval = this.config.defaultBrokerPollInterval;
     if (void 0 === this.config.rateLimitBytes) {
       this.rateLimit = new DummyRateLimit();
@@ -82,10 +83,12 @@ class Snowflake {
           this.pollInterval =
                 Math.min(this.pollInterval + this.config.pollAdjustment,
                   this.config.slowestBrokerPollInterval);
-          // if we fail to connect to a restricted client, assume restricted NAT
-          if (clientNAT == "restricted"){
+          // if we fail to connect to a restricted client 3 times in
+          // a row, assume we have a restricted NAT
+          if ((clientNAT == "restricted") && (this.natFailures > 3)){
             this.ui.natType = "restricted";
             console.log("Learned NAT type: restricted");
+            this.natFailures = 0;
           }
           this.broker.setNATType(this.ui.natType);
         } else {
@@ -93,6 +96,7 @@ class Snowflake {
           this.pollInterval =
                 Math.max(this.pollInterval - this.config.pollAdjustment,
                   this.config.defaultBrokerPollInterval);
+          this.natFailures = 0;
         }
         return;
       }), this.config.datachannelTimeout);



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