1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798 |
- // 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 <unordered_map>
- #include <utility>
- #include <vector>
- #include "base/files/file_path.h"
- #include "base/strings/string_piece.h"
- #include "net/base/address_family.h"
- #include "net/base/ip_address.h"
- #include "net/base/net_export.h"
- namespace net {
- using DnsHostsKey = std::pair<std::string, AddressFamily>;
- struct DnsHostsKeyHash {
- std::size_t operator()(const DnsHostsKey& key) const {
- return base::StringPieceHash()(key.first) + key.second;
- }
- };
- // 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.
- using DnsHosts = std::unordered_map<DnsHostsKey, IPAddress, DnsHostsKeyHash>;
- // 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);
- // Test-injectable HOSTS parser.
- class NET_EXPORT_PRIVATE DnsHostsParser {
- public:
- virtual ~DnsHostsParser();
- // Parses HOSTS and stores results in `dns_hosts`, with addresses in the order
- // in which they were read. Invalid lines are ignored (as in most
- // implementations).
- virtual bool ParseHosts(DnsHosts* hosts) const = 0;
- };
- // Implementation of `DnsHostsParser` that reads HOSTS from a given file.
- class NET_EXPORT_PRIVATE DnsHostsFileParser : public DnsHostsParser {
- public:
- explicit DnsHostsFileParser(base::FilePath hosts_file_path);
- ~DnsHostsFileParser() override;
- DnsHostsFileParser(const DnsHostsFileParser&) = delete;
- DnsHostsFileParser& operator=(const DnsHostsFileParser&) = delete;
- // DnsHostsParser:
- bool ParseHosts(DnsHosts* dns_hosts) const override;
- private:
- const base::FilePath hosts_file_path_;
- };
- } // namespace net
- #endif // NET_DNS_DNS_HOSTS_H_
|