Bypass all proxies for all hosts if no_proxy='*' is set (#2395)

* Bypass top level domain even if no_proxy specified it with leading '.'

E.g. no_proxy='.github.com' will now bypass github.com.

* Bypass proxy on all hosts when no_proxy is * (wildcard)

* Undo '.' stripping

* Simplify unit tests

* Respect wildcard even if it's one of many no_proxy items

src/Runner.Sdk/RunnerWebProxy.cs

@@ -164,7 +164,6 @@ namespace GitHub.Runner.Sdk
                         {
                             continue;
                         }
-
                         _noProxyList.Add(noProxyInfo);
                     }
                 }
@@ -207,6 +206,11 @@ namespace GitHub.Runner.Sdk
         {
             foreach (var noProxy in _noProxyList)
             {
+                // bypass on wildcard no_proxy
+                if (string.Equals(noProxy.Host, "*", StringComparison.OrdinalIgnoreCase))
+                {
+                    return true;
+                }
                 var matchHost = false;
                 var matchPort = false;
 

src/Test/L0/RunnerWebProxyL0.cs

@@ -351,7 +351,7 @@ namespace GitHub.Runner.Common.Tests
                 Assert.False(proxy.IsBypassed(new Uri("https://actions.com")));
                 Assert.False(proxy.IsBypassed(new Uri("https://ggithub.com")));
                 Assert.False(proxy.IsBypassed(new Uri("https://github.comm")));
-                Assert.False(proxy.IsBypassed(new Uri("https://google.com")));
+                Assert.False(proxy.IsBypassed(new Uri("https://google.com"))); // no_proxy has '.google.com', specifying only subdomains bypass
                 Assert.False(proxy.IsBypassed(new Uri("https://example.com")));
                 Assert.False(proxy.IsBypassed(new Uri("http://example.com:333")));
                 Assert.False(proxy.IsBypassed(new Uri("http://192.168.0.123:123")));
@@ -374,6 +374,76 @@ namespace GitHub.Runner.Common.Tests
                 CleanProxyEnv();
             }
         }
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void BypassAllOnWildcardNoProxy()
+        {
+            try
+            {
+                Environment.SetEnvironmentVariable("http_proxy", "http://user1:pass1%40@127.0.0.1:8888");
+                Environment.SetEnvironmentVariable("https_proxy", "http://user2:pass2%40@127.0.0.1:9999");
+                Environment.SetEnvironmentVariable("no_proxy", "example.com, * , example2.com");
+                var proxy = new RunnerWebProxy();
+
+                Assert.True(proxy.IsBypassed(new Uri("http://actions.com")));
+                Assert.True(proxy.IsBypassed(new Uri("http://localhost")));
+                Assert.True(proxy.IsBypassed(new Uri("http://127.0.0.1:8080")));
+                Assert.True(proxy.IsBypassed(new Uri("https://actions.com")));
+                Assert.True(proxy.IsBypassed(new Uri("https://localhost")));
+                Assert.True(proxy.IsBypassed(new Uri("https://127.0.0.1:8080")));
+            }
+            finally
+            {
+                CleanProxyEnv();
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void IgnoreWildcardInNoProxySubdomain()
+        {
+            try
+            {
+                Environment.SetEnvironmentVariable("http_proxy", "http://user1:pass1%40@127.0.0.1:8888");
+                Environment.SetEnvironmentVariable("https_proxy", "http://user2:pass2%40@127.0.0.1:9999");
+                Environment.SetEnvironmentVariable("no_proxy", "*.example.com");
+                var proxy = new RunnerWebProxy();
+
+                Assert.False(proxy.IsBypassed(new Uri("http://sub.example.com")));
+                Assert.False(proxy.IsBypassed(new Uri("http://example.com")));
+            }
+            finally
+            {
+                CleanProxyEnv();
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void WildcardNoProxyWorksWhenOtherNoProxyAreAround()
+        {
+            try
+            {
+                Environment.SetEnvironmentVariable("http_proxy", "http://user1:pass1%40@127.0.0.1:8888");
+                Environment.SetEnvironmentVariable("https_proxy", "http://user2:pass2%40@127.0.0.1:9999");
+                Environment.SetEnvironmentVariable("no_proxy", "example.com,*,example2.com");
+                var proxy = new RunnerWebProxy();
+
+                Assert.True(proxy.IsBypassed(new Uri("http://actions.com")));
+                Assert.True(proxy.IsBypassed(new Uri("http://localhost")));
+                Assert.True(proxy.IsBypassed(new Uri("http://127.0.0.1:8080")));
+                Assert.True(proxy.IsBypassed(new Uri("https://actions.com")));
+                Assert.True(proxy.IsBypassed(new Uri("https://localhost")));
+                Assert.True(proxy.IsBypassed(new Uri("https://127.0.0.1:8080")));
+            }
+            finally
+            {
+                CleanProxyEnv();
+            }
+        }
 
         [Fact]
         [Trait("Level", "L0")]