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_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
TEST_F(DNSUtilTest,DNSDomainToString)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