Revert "Support replacement of IP address resolutions via command line flag"

net/base/ip_mapping_rules.h

-// Copyright 2014 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_BASE_IP_MAPPING_RULES_H_
-#define NET_BASE_IP_MAPPING_RULES_H_
-
-#include <string>
-#include <vector>
-
-#include "base/macros.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-class AddressList;
-
-// This class contains a list of rules, that can be used to process (Rewrite) a
-// set of DNS resolutions (IP addresses) in accordance with those rules.
-// Currently the only rules supported use a pattern match against some given IP
-// addresses, and may, if there is a match, place one new IP address at the
-// start of the rewritten address list (re: the "PREFACE" directive).  This
-// supports a common use case where the matching detects an address in a given
-// edge network server group, and the inserted address points to a server that
-// is expected to handle all requests that would otherwise have gone to the
-// given group of servers.
-class NET_EXPORT_PRIVATE IPMappingRules {
- public:
-  IPMappingRules();
-  ~IPMappingRules();
-
-  // Modifies |*addresses| based on the current rules. Returns true if
-  // |addresses| was modified, false otherwise.
-  bool RewriteAddresses(AddressList* addresses) const;
-
-  // Adds a rule to this mapper.
-  // Rules are evaluated against an address list until a first matching rule is
-  // found that applies, causing a modification of the address list.
-  // Each rule consists of one or more of the following pattern and action
-  // directives.
-  //
-  //   RULE: CHANGE_DIRECTIVE | EMPTY
-  //   CHANGE_DIRECTIVE: "PREFACE" SPACE IP_PATTERN SPACE IP_LITERAL
-  //   SPACE: " "
-  //   EMPTY:
-  //
-  //   IP_LITERAL: IP_V6_LITERAL | IP_V4_LITERAL
-  //
-  //   IP_V4_LITERAL: OCTET "." OCTET "." OCTET "." OCTET
-  //   OCTET: decimal number in range 0 ... 255
-  //
-  //   IP_V6_LITERAL:  HEX_COMPONENT  | IP_V6_LITERAL ":" HEX_COMPONENT
-  //   HEX_COMPONENT: hexadecimal values with no more than 4 hex digits
-  //
-  //   IP_PATTERN: IP_V6_PATTERN | IP_V4_PATTERN
-  //
-  //   IP_V6_PATTERN: HEX_PATTERN | IP_V6_PATTERN ":" HEX_PATTERN
-  //   HEX_PATTERN:  HEX_COMPONENT | "[" HEX_GROUP_PATTERN "]" | "*"
-  //   HEX_GROUP_PATTERN: HEX_RANGE | HEX_GROUP_PATTERN "," HEX_RANGE
-  //   HEX_RANGE: HEX_COMPONENT |  HEX_COMPONENT "-" HEX_COMPONENT
-  //
-  //   IP_V4_PATTERN: OCTET_PATTERN "." OCTET_PATTERN "." OCTET_PATTERN
-  //                  "." OCTET_PATTERN
-  //   OCTET_PATTERN:  OCTET | "[" OCTET_GROUP_PATTERN "]" | "*"
-  //   OCTET_GROUP_PATTERN: OCTET_RANGE | OCTET_GROUP_PATTERN "," OCTET_RANGE
-  //   OCTET_RANGE: OCTET | OCTET "-" OCTET
-  //
-  // All literals are required to have all their components specified (4
-  // components for IPv4, and 8 for IPv6).  Specifically, there is currently no
-  // support for elided compenents in an IPv6 address (e.g., "::").
-  // Returns true if the rule was successfully parsed and added.
-  bool AddRuleFromString(const std::string& rule_string);
-
-  // Sets the rules from a semicolon separated list of rules.
-  // Returns true if all the rules were successfully parsed and added.
-  bool SetRulesFromString(const std::string& rules_string);
-
- private:
-  class Rule;
-  typedef std::vector<Rule*> RuleList;
-
-  // We own all rules in this list, and are responsible for their destruction.
-  RuleList rules_;
-
-  DISALLOW_COPY_AND_ASSIGN(IPMappingRules);
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_IP_MAPPING_RULES_H_