Track how often we would attempt to resolve non-'compliant' domain names.

net/dns/dns_util.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/dns/dns_util.h"
 
 #include <errno.h>
 #include <limits.h>
 
 #include <cstring>
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "build/build_config.h"
 #include "net/base/address_list.h"
+#include "net/base/url_util.h"
 #include "net/dns/dns_protocol.h"
+#include "url/url_canon.h"
 
 namespace {
 
 // RFC 1035, section 2.3.4: labels 63 octets or less.
 // Section 3.1: Each label is represented as a one octet length field followed
 // by that number of octets.
 const int kMaxLabelLength = 63;
 
 }  // namespace
 
@@ skipping 38 matching lines @@
       name[namelen++] = static_cast<char>(labellen);
       memcpy(name + namelen, label, labellen);
       namelen += labellen;
       labellen = 0;
       continue;
     }
     if (labellen >= sizeof label)
       return false;
     if (!IsValidHostLabelCharacter(ch, labellen == 0)) {
       // TODO(palmer): In the future, when we can remove support for invalid
-      // names, return false here instead (and remove the UMA counter).
+      // names, return false here instead (and remove the Net.Valid*DNSName UMA
+      // counters).
       valid_name = false;
     }
     label[labellen++] = ch;
   }
 
   UMA_HISTOGRAM_BOOLEAN("Net.ValidDNSName", valid_name);
+  if (valid_name) {
+    url::CanonHostInfo info;
+    UMA_HISTOGRAM_BOOLEAN("Net.DNSNameCompliantIfValid",
+                          net::IsCanonicalizedHostCompliant(
+                              net::CanonicalizeHost(dotted, &info)));
+  }
 
   // Allow empty label at end of name to disable suffix search.
   if (labellen) {
     if (namelen + labellen + 1 > sizeof name)
       return false;
     name[namelen++] = static_cast<char>(labellen);
     memcpy(name + namelen, label, labellen);
     namelen += labellen;
     labellen = 0;
   }
@@ skipping 102 matching lines @@
     return DELTA_IDENTICAL;
   else if (same_size && !any_missing)
     return DELTA_REORDERED;
   else if (any_match)
     return DELTA_OVERLAP;
   else
     return DELTA_DISJOINT;
 }
 
 }  // namespace net