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      1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/base/dns_util.h"
      6 #include "testing/gtest/include/gtest/gtest.h"
      7 
      8 namespace net {
      9 
     10 class DNSUtilTest : public testing::Test {
     11 };
     12 
     13 // IncludeNUL converts a char* to a std::string and includes the terminating
     14 // NUL in the result.
     15 static std::string IncludeNUL(const char* in) {
     16   return std::string(in, strlen(in) + 1);
     17 }
     18 
     19 TEST_F(DNSUtilTest, DNSDomainFromDot) {
     20   std::string out;
     21 
     22   EXPECT_FALSE(DNSDomainFromDot("", &out));
     23   EXPECT_FALSE(DNSDomainFromDot(".", &out));
     24   EXPECT_FALSE(DNSDomainFromDot("..", &out));
     25 
     26   EXPECT_TRUE(DNSDomainFromDot("com", &out));
     27   EXPECT_EQ(out, IncludeNUL("\003com"));
     28   EXPECT_TRUE(DNSDomainFromDot("google.com", &out));
     29   EXPECT_EQ(out, IncludeNUL("\x006google\003com"));
     30   EXPECT_TRUE(DNSDomainFromDot("www.google.com", &out));
     31   EXPECT_EQ(out, IncludeNUL("\003www\006google\003com"));
     32 
     33   // Label is 63 chars: still valid
     34   EXPECT_TRUE(DNSDomainFromDot("123456789a123456789a123456789a123456789a123456789a123456789a123", &out));
     35   EXPECT_EQ(out, IncludeNUL("\077123456789a123456789a123456789a123456789a123456789a123456789a123"));
     36 
     37   // Label is too long: invalid
     38   EXPECT_FALSE(DNSDomainFromDot("123456789a123456789a123456789a123456789a123456789a123456789a1234", &out));
     39 
     40   // 253 characters in the name: still valid
     41   EXPECT_TRUE(DNSDomainFromDot("123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123", &out));
     42   EXPECT_EQ(out, IncludeNUL("\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\011123456789\003123"));
     43 
     44   // 254 characters in the name: invalid
     45   EXPECT_FALSE(DNSDomainFromDot("123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.1234", &out));
     46 
     47   // Zero length labels should be dropped.
     48   EXPECT_TRUE(DNSDomainFromDot("www.google.com.", &out));
     49   EXPECT_EQ(out, IncludeNUL("\003www\006google\003com"));
     50 
     51   EXPECT_TRUE(DNSDomainFromDot(".google.com", &out));
     52   EXPECT_EQ(out, IncludeNUL("\006google\003com"));
     53 
     54   EXPECT_TRUE(DNSDomainFromDot("www..google.com", &out));
     55   EXPECT_EQ(out, IncludeNUL("\003www\006google\003com"));
     56 }
     57 
     58 TEST_F(DNSUtilTest, DNSDomainToString) {
     59   EXPECT_EQ("", DNSDomainToString(IncludeNUL("")));
     60   EXPECT_EQ("foo", DNSDomainToString(IncludeNUL("\003foo")));
     61   EXPECT_EQ("foo.bar", DNSDomainToString(IncludeNUL("\003foo\003bar")));
     62   EXPECT_EQ("foo.bar.uk",
     63             DNSDomainToString(IncludeNUL("\003foo\003bar\002uk")));
     64 
     65   // It should cope with a lack of root label.
     66   EXPECT_EQ("foo.bar", DNSDomainToString("\003foo\003bar"));
     67 
     68   // Invalid inputs should return an empty string.
     69   EXPECT_EQ("", DNSDomainToString(IncludeNUL("\x80")));
     70   EXPECT_EQ("", DNSDomainToString("\x06"));
     71 }
     72 
     73 }  // namespace net
     74