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1 // Copyright (c) 2012 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 #ifndef NET_DNS_DNS_HOSTS_H_ | |
6 #define NET_DNS_DNS_HOSTS_H_ | |
7 | |
8 #include <map> | |
9 #include <string> | |
10 #include <utility> | |
11 #include <vector> | |
12 | |
13 #include "base/basictypes.h" | |
14 #include "base/containers/hash_tables.h" | |
15 #include "base/files/file_path.h" | |
16 #include "net/base/address_family.h" | |
17 #include "net/base/net_export.h" | |
18 #include "net/base/net_util.h" // can't forward-declare IPAddressNumber | |
19 | |
20 namespace net { | |
21 typedef std::pair<std::string, AddressFamily> DnsHostsKey; | |
22 }; | |
23 | |
24 namespace BASE_HASH_NAMESPACE { | |
25 | |
26 template<> | |
27 struct hash<net::DnsHostsKey> { | |
28 std::size_t operator()(const net::DnsHostsKey& key) const { | |
29 hash<base::StringPiece> string_piece_hash; | |
30 return string_piece_hash(key.first) + key.second; | |
31 } | |
32 }; | |
33 | |
34 } // namespace BASE_HASH_NAMESPACE | |
35 | |
36 namespace net { | |
37 | |
38 // There are OS-specific variations in how commas in the hosts file behave. | |
39 enum ParseHostsCommaMode { | |
40 // Comma is treated as part of a hostname: | |
41 // "127.0.0.1 foo,bar" parses as "foo,bar" mapping to "127.0.0.1". | |
42 PARSE_HOSTS_COMMA_IS_TOKEN, | |
43 | |
44 // Comma is treated as a hostname separator: | |
45 // "127.0.0.1 foo,bar" parses as "foo" and "bar" both mapping to "127.0.0.1". | |
46 PARSE_HOSTS_COMMA_IS_WHITESPACE, | |
47 }; | |
48 | |
49 // Parsed results of a Hosts file. | |
50 // | |
51 // Although Hosts files map IP address to a list of domain names, for name | |
52 // resolution the desired mapping direction is: domain name to IP address. | |
53 // When parsing Hosts, we apply the "first hit" rule as Windows and glibc do. | |
54 // With a Hosts file of: | |
55 // 300.300.300.300 localhost # bad ip | |
56 // 127.0.0.1 localhost | |
57 // 10.0.0.1 localhost | |
58 // The expected resolution of localhost is 127.0.0.1. | |
59 #if !defined(OS_ANDROID) | |
60 typedef base::hash_map<DnsHostsKey, IPAddressNumber> DnsHosts; | |
61 #else | |
62 // Android's hash_map doesn't support ==, so fall back to map. (Chromium on | |
63 // Android doesn't use the built-in DNS resolver anyway, so it's irrelevant.) | |
64 typedef std::map<DnsHostsKey, IPAddressNumber> DnsHosts; | |
65 #endif | |
66 | |
67 // Parses |contents| (as read from /etc/hosts or equivalent) and stores results | |
68 // in |dns_hosts|. Invalid lines are ignored (as in most implementations). | |
69 // Overrides the OS-specific default handling of commas, so unittests can test | |
70 // both modes. | |
71 void NET_EXPORT_PRIVATE ParseHostsWithCommaModeForTesting( | |
72 const std::string& contents, | |
73 DnsHosts* dns_hosts, | |
74 ParseHostsCommaMode comma_mode); | |
75 | |
76 // Parses |contents| (as read from /etc/hosts or equivalent) and stores results | |
77 // in |dns_hosts|. Invalid lines are ignored (as in most implementations). | |
78 void NET_EXPORT_PRIVATE ParseHosts(const std::string& contents, | |
79 DnsHosts* dns_hosts); | |
80 | |
81 // As above but reads the file pointed to by |path|. | |
82 bool NET_EXPORT_PRIVATE ParseHostsFile(const base::FilePath& path, | |
83 DnsHosts* dns_hosts); | |
84 | |
85 | |
86 | |
87 } // namespace net | |
88 | |
89 #endif // NET_DNS_DNS_HOSTS_H_ | |
90 | |
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