Support domain=IPADDR if it matches the url ip address exactly.

net/base/cookie_monster.cc

 // Copyright (c) 2006-2008 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.
 
 // Portions of this code based on Mozilla:
 //   (netwerk/cookie/src/nsCookieService.cpp)
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
@@ skipping 241 matching lines @@
 }
 
 // Determine the cookie domain key to use for setting the specified cookie.
 // On success returns true, and sets cookie_domain_key to either a
 //   -host cookie key (ex: "google.com")
 //   -domain cookie key (ex: ".google.com")
 static bool GetCookieDomainKey(const GURL& url,
                                const CookieMonster::ParsedCookie& pc,
                                std::string* cookie_domain_key) {
   const std::string url_host(url.host());
-  if (!pc.HasDomain() || pc.Domain().empty()) {
-    // No domain was specified in cookie -- default to host cookie.
+
+  // If no domain was specified in the cookie, default to a host cookie.
+  // We match IE/Firefox in allowing a domain=IPADDR if it matches the url
+  // ip address hostname exactly.  It should be treated as a host cookie.
+  if (!pc.HasDomain() || pc.Domain().empty() ||
+      (url.HostIsIPAddress() && url_host == pc.Domain())) {
     *cookie_domain_key = url_host;
     DCHECK((*cookie_domain_key)[0] != '.');
     return true;
   }
 
   // Get the normalized domain specified in cookie line.
   // Note: The RFC says we can reject a cookie if the domain
   // attribute does not start with a dot. IE/FF/Safari however, allow a cookie
   // of the form domain=my.domain.com, treating it the same as
   // domain=.my.domain.com -- for compatibility we do the same here.  Firefox
@@ skipping 835 matching lines @@
 }
 
 std::string CookieMonster::CanonicalCookie::DebugString() const {
   return StringPrintf("name: %s value: %s path: %s creation: %llu",
                       name_.c_str(), value_.c_str(), path_.c_str(),
                       creation_date_.ToTimeT());
 }
 
 }  // namespace