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77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_DNS_HOSTS_H_
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#define NET_DNS_DNS_HOSTS_H_
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#include <stddef.h>
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#include <map>
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#include <string>
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#include <unordered_map>
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#include <utility>
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#include <vector>
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#include "base/files/file_path.h"
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#include "base/strings/string_piece.h"
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#include "net/base/address_family.h"
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#include "net/base/ip_address.h"
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#include "net/base/net_export.h"
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namespace net {
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using DnsHostsKey = std::pair<std::string, AddressFamily>;
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struct DnsHostsKeyHash {
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std::size_t operator()(const DnsHostsKey& key) const {
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return base::StringPieceHash()(key.first) + key.second;
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}
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};
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// There are OS-specific variations in how commas in the hosts file behave.
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enum ParseHostsCommaMode {
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// Comma is treated as part of a hostname:
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// "127.0.0.1 foo,bar" parses as "foo,bar" mapping to "127.0.0.1".
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PARSE_HOSTS_COMMA_IS_TOKEN,
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// Comma is treated as a hostname separator:
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// "127.0.0.1 foo,bar" parses as "foo" and "bar" both mapping to "127.0.0.1".
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PARSE_HOSTS_COMMA_IS_WHITESPACE,
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};
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// Parsed results of a Hosts file.
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//
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// Although Hosts files map IP address to a list of domain names, for name
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// resolution the desired mapping direction is: domain name to IP address.
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// When parsing Hosts, we apply the "first hit" rule as Windows and glibc do.
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// With a Hosts file of:
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// 300.300.300.300 localhost # bad ip
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// 127.0.0.1 localhost
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// 10.0.0.1 localhost
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// The expected resolution of localhost is 127.0.0.1.
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using DnsHosts = std::unordered_map<DnsHostsKey, IPAddress, DnsHostsKeyHash>;
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// Parses |contents| (as read from /etc/hosts or equivalent) and stores results
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// in |dns_hosts|. Invalid lines are ignored (as in most implementations).
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// Overrides the OS-specific default handling of commas, so unittests can test
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// both modes.
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void NET_EXPORT_PRIVATE ParseHostsWithCommaModeForTesting(
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const std::string& contents,
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DnsHosts* dns_hosts,
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ParseHostsCommaMode comma_mode);
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// Parses |contents| (as read from /etc/hosts or equivalent) and stores results
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// in |dns_hosts|. Invalid lines are ignored (as in most implementations).
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void NET_EXPORT_PRIVATE ParseHosts(const std::string& contents,
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DnsHosts* dns_hosts);
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// As above but reads the file pointed to by |path|.
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bool NET_EXPORT_PRIVATE ParseHostsFile(const base::FilePath& path,
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DnsHosts* dns_hosts,
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int64_t* file_size);
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} // namespace net
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#endif // NET_DNS_DNS_HOSTS_H_
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