net/dns/dns_hosts.h

   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/file_path.h"
  14 #include "net/base/address_family.h"
  15 #include "net/base/net_export.h"
  16 #include "net/base/net_util.h"  // can't forward-declare IPAddressNumber
  17
  18 namespace net {
  19
  20 // Parsed results of a Hosts file.
  21 //
  22 // Although Hosts files map IP address to a list of domain names, for name
  23 // resolution the desired mapping direction is: domain name to IP address.
  24 // When parsing Hosts, we apply the "first hit" rule as Windows and glibc do.
  25 // With a Hosts file of:
  26 // 300.300.300.300 localhost # bad ip
  27 // 127.0.0.1 localhost
  28 // 10.0.0.1 localhost
  29 // The expected resolution of localhost is 127.0.0.1.
  30 typedef std::pair<std::string, AddressFamily> DnsHostsKey;
  31 typedef std::map<DnsHostsKey, IPAddressNumber> DnsHosts;
  32
  33 // Parses |contents| (as read from /etc/hosts or equivalent) and stores results
  34 // in |dns_hosts|. Invalid lines are ignored (as in most implementations).
  35 void NET_EXPORT_PRIVATE ParseHosts(const std::string& contents,
  36                                    DnsHosts* dns_hosts);
  37
  38 // As above but reads the file pointed to by |path|.
  39 bool NET_EXPORT_PRIVATE ParseHostsFile(const FilePath& path,
  40                                        DnsHosts* dns_hosts);
  41
  42
  43
  44 }  // namespace net
  45
  46 #endif  // NET_DNS_DNS_HOSTS_H_
  47