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

net/base/cookie_monster_unittest.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.
 
 #include <time.h>
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/platform_thread.h"
@@ skipping 388 matching lines @@
     net::CookieMonster cm;
     EXPECT_TRUE(cm.SetCookie(url_ip, kValidCookieLine));
     EXPECT_EQ("A=B", cm.GetCookies(url_ip));
   }
 
   {  // IP addresses should not be able to set domain cookies.
     net::CookieMonster cm;
     EXPECT_FALSE(cm.SetCookie(url_ip, "b=2; domain=.1.2.3.4"));
     EXPECT_FALSE(cm.SetCookie(url_ip, "c=3; domain=.3.4"));
     EXPECT_EQ("", cm.GetCookies(url_ip));
+    // It should be allowed to set a cookie if domain= matches the IP address
+    // exactly.  This matches IE/Firefox, even though it seems a bit wrong.
+    EXPECT_FALSE(cm.SetCookie(url_ip, "b=2; domain=1.2.3.3"));
+    EXPECT_EQ("", cm.GetCookies(url_ip));
+    EXPECT_TRUE(cm.SetCookie(url_ip, "b=2; domain=1.2.3.4"));
+    EXPECT_EQ("b=2", cm.GetCookies(url_ip));
   }
 }
 
 // Test host cookies, and setting of cookies on TLD.
 TEST(CookieMonsterTest, TestNonDottedAndTLD) {
   {
     net::CookieMonster cm;
     GURL url("http://com/");
     // Allow setting on "com", (but only as a host cookie).
     EXPECT_TRUE(cm.SetCookie(url, "a=1"));
@@ skipping 498 matching lines @@
 
   EXPECT_TRUE(FindAndDeleteCookie(cm, url_google.host(), "C"));
   EXPECT_EQ("A=B; E=F", cm.GetCookies(url_google));
 
   EXPECT_FALSE(FindAndDeleteCookie(cm, "random.host", "E"));
   EXPECT_EQ("A=B; E=F", cm.GetCookies(url_google));
 }
 
 // TODO test overwrite cookie