Allow hyphens at the beginning of domain components, except for the last domain component.

net/base/net_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/base/net_util.h"
 
 #include <unicode/regex.h>
 #include <unicode/ucnv.h>
 #include <unicode/uidna.h>
 #include <unicode/ulocdata.h>
@@ skipping 1163 matching lines @@
     return false;
 
   bool in_component = false;
   bool most_recent_component_started_alpha = false;
   bool last_char_was_hyphen_or_underscore = false;
 
   for (std::string::const_iterator i(host.begin()); i != host.end(); ++i) {
     const char c = *i;
     if (!in_component) {
       most_recent_component_started_alpha = IsHostCharAlpha(c);
-      if (!most_recent_component_started_alpha && !IsHostCharDigit(c))
+      if (!most_recent_component_started_alpha && !IsHostCharDigit(c) &&
+          (c != '-'))
         return false;
       in_component = true;
     } else {
       if (c == '.') {
         if (last_char_was_hyphen_or_underscore)
           return false;
         in_component = false;
       } else if (IsHostCharAlpha(c) || IsHostCharDigit(c)) {
         last_char_was_hyphen_or_underscore = false;
       } else if ((c == '-') || (c == '_')) {
@@ skipping 1046 matching lines @@
 
 NetworkInterface::NetworkInterface(const std::string& name,
                                    const IPAddressNumber& address)
     : name(name), address(address) {
 }
 
 NetworkInterface::~NetworkInterface() {
 }
 
 }  // namespace net