1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_DNS_HOSTS_H_
#define NET_DNS_DNS_HOSTS_H_
#include <stddef.h>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "base/containers/hash_tables.h"
#include "base/files/file_path.h"
#include "net/base/address_family.h"
#include "net/base/ip_address.h"
#include "net/base/net_export.h"
namespace net {
typedef std::pair<std::string, AddressFamily> DnsHostsKey;
};
namespace BASE_HASH_NAMESPACE {
template<>
struct hash<net::DnsHostsKey> {
std::size_t operator()(const net::DnsHostsKey& key) const {
return base::StringPieceHash()(key.first) + key.second;
}
};
} // namespace BASE_HASH_NAMESPACE
namespace net {
// There are OS-specific variations in how commas in the hosts file behave.
enum ParseHostsCommaMode {
// Comma is treated as part of a hostname:
// "127.0.0.1 foo,bar" parses as "foo,bar" mapping to "127.0.0.1".
PARSE_HOSTS_COMMA_IS_TOKEN,
// Comma is treated as a hostname separator:
// "127.0.0.1 foo,bar" parses as "foo" and "bar" both mapping to "127.0.0.1".
PARSE_HOSTS_COMMA_IS_WHITESPACE,
};
// Parsed results of a Hosts file.
//
// Although Hosts files map IP address to a list of domain names, for name
// resolution the desired mapping direction is: domain name to IP address.
// When parsing Hosts, we apply the "first hit" rule as Windows and glibc do.
// With a Hosts file of:
// 300.300.300.300 localhost # bad ip
// 127.0.0.1 localhost
// 10.0.0.1 localhost
// The expected resolution of localhost is 127.0.0.1.
#if !defined(OS_ANDROID)
typedef base::hash_map<DnsHostsKey, IPAddress> DnsHosts;
#else
// Android's hash_map doesn't support ==, so fall back to map. (Chromium on
// Android doesn't use the built-in DNS resolver anyway, so it's irrelevant.)
typedef std::map<DnsHostsKey, IPAddress> DnsHosts;
#endif
// Parses |contents| (as read from /etc/hosts or equivalent) and stores results
// in |dns_hosts|. Invalid lines are ignored (as in most implementations).
// Overrides the OS-specific default handling of commas, so unittests can test
// both modes.
void NET_EXPORT_PRIVATE ParseHostsWithCommaModeForTesting(
const std::string& contents,
DnsHosts* dns_hosts,
ParseHostsCommaMode comma_mode);
// Parses |contents| (as read from /etc/hosts or equivalent) and stores results
// in |dns_hosts|. Invalid lines are ignored (as in most implementations).
void NET_EXPORT_PRIVATE ParseHosts(const std::string& contents,
DnsHosts* dns_hosts);
// As above but reads the file pointed to by |path|.
bool NET_EXPORT_PRIVATE ParseHostsFile(const base::FilePath& path,
DnsHosts* dns_hosts);
} // namespace net
#endif // NET_DNS_DNS_HOSTS_H_
|
