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.
IncludeNUL(const char * in)15 static std::string IncludeNUL(const char* in) {
16 return std::string(in, strlen(in) + 1);
17 }
18
TEST_F(DNSUtilTest,DNSDomainFromDot)19 TEST_F(DNSUtilTest, DNSDomainFromDot) {
20 std::string out;
21
22 EXPECT_TRUE(DNSDomainFromDot("", &out));
23 EXPECT_EQ(out, IncludeNUL(""));
24 EXPECT_TRUE(DNSDomainFromDot("com", &out));
25 EXPECT_EQ(out, IncludeNUL("\003com"));
26 EXPECT_TRUE(DNSDomainFromDot("google.com", &out));
27 EXPECT_EQ(out, IncludeNUL("\x006google\003com"));
28 EXPECT_TRUE(DNSDomainFromDot("www.google.com", &out));
29 EXPECT_EQ(out, IncludeNUL("\003www\006google\003com"));
30
31 // Label is 63 chars: still valid
32 EXPECT_TRUE(DNSDomainFromDot("123456789a123456789a123456789a123456789a123456789a123456789a123", &out));
33 EXPECT_EQ(out, IncludeNUL("\077123456789a123456789a123456789a123456789a123456789a123456789a123"));
34
35 // Label is too long: invalid
36 EXPECT_FALSE(DNSDomainFromDot("123456789a123456789a123456789a123456789a123456789a123456789a1234", &out));
37
38 // 253 characters in the name: still valid
39 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));
40 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"));
41
42 // 254 characters in the name: invalid
43 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));
44
45 // Zero length labels should be dropped.
46 EXPECT_TRUE(DNSDomainFromDot("www.google.com.", &out));
47 EXPECT_EQ(out, IncludeNUL("\003www\006google\003com"));
48
49 EXPECT_TRUE(DNSDomainFromDot(".google.com", &out));
50 EXPECT_EQ(out, IncludeNUL("\006google\003com"));
51
52 EXPECT_TRUE(DNSDomainFromDot("www..google.com", &out));
53 EXPECT_EQ(out, IncludeNUL("\003www\006google\003com"));
54 }
55
TEST_F(DNSUtilTest,DNSDomainToString)56 TEST_F(DNSUtilTest, DNSDomainToString) {
57 EXPECT_EQ("", DNSDomainToString(IncludeNUL("")));
58 EXPECT_EQ("foo", DNSDomainToString(IncludeNUL("\003foo")));
59 EXPECT_EQ("foo.bar", DNSDomainToString(IncludeNUL("\003foo\003bar")));
60 EXPECT_EQ("foo.bar.uk",
61 DNSDomainToString(IncludeNUL("\003foo\003bar\002uk")));
62
63 // It should cope with a lack of root label.
64 EXPECT_EQ("foo.bar", DNSDomainToString("\003foo\003bar"));
65
66 // Invalid inputs should return an empty string.
67 EXPECT_EQ("", DNSDomainToString(IncludeNUL("\x80")));
68 EXPECT_EQ("", DNSDomainToString("\x06"));
69 }
70
TEST_F(DNSUtilTest,STD3ASCII)71 TEST_F(DNSUtilTest, STD3ASCII) {
72 EXPECT_TRUE(IsSTD3ASCIIValidCharacter('a'));
73 EXPECT_TRUE(IsSTD3ASCIIValidCharacter('b'));
74 EXPECT_TRUE(IsSTD3ASCIIValidCharacter('c'));
75 EXPECT_TRUE(IsSTD3ASCIIValidCharacter('1'));
76 EXPECT_TRUE(IsSTD3ASCIIValidCharacter('2'));
77 EXPECT_TRUE(IsSTD3ASCIIValidCharacter('3'));
78
79 EXPECT_FALSE(IsSTD3ASCIIValidCharacter('.'));
80 EXPECT_FALSE(IsSTD3ASCIIValidCharacter('/'));
81 EXPECT_FALSE(IsSTD3ASCIIValidCharacter('\x00'));
82 }
83
84 } // namespace net
85