net/base/dns_util_unittest.cc

   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("z23456789a123456789a123456789a123456789a123456789a123456789a123", &out));
  35   EXPECT_EQ(out, IncludeNUL("\077z23456789a123456789a123456789a123456789a123456789a123456789a123"));
  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("abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abcdefghi.abc", &out));
  42   EXPECT_EQ(out, IncludeNUL("\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\011abcdefghi\003abc"));
  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