src/acl/BoolOps.h

   1 /*
   2  * Copyright (C) 1996-2020 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef SQUID_ACL_LOGIC_H
  10 #define SQUID_ACL_LOGIC_H
  11
  12 #include "acl/InnerNode.h"
  13
  14 /* ACLs defined here are used internally to construct an ACL expression tree.
  15  * They cannot be specified directly in squid.conf because squid.conf ACLs are
  16  * more complex than (and are implemented using) these operator-like classes.*/
  17
  18 namespace Acl
  19 {
  20
  21 /// Implements the "not" or "!" operator.
  22 class NotNode: public InnerNode
  23 {
  24     MEMPROXY_CLASS(NotNode);
  25
  26 public:
  27     explicit NotNode(ACL *acl);
  28
  29 private:
  30     /* ACL API */
  31     virtual char const *typeString() const;
  32     virtual ACL *clone() const;
  33     virtual void parse();
  34     virtual SBufList dump() const;
  35
  36     /* Acl::InnerNode API */
  37     virtual int doMatch(ACLChecklist *checklist, Nodes::const_iterator start) const;
  38 };
  39
  40 /// An inner ACL expression tree node representing a boolean conjuction (AND)
  41 /// operator applied to a list of child tree nodes.
  42 /// For example, conditions expressed on a single http_access line are ANDed.
  43 class AndNode: public InnerNode
  44 {
  45     MEMPROXY_CLASS(AndNode);
  46
  47 public:
  48     /* ACL API */
  49     virtual char const *typeString() const;
  50     virtual ACL *clone() const;
  51     virtual void parse();
  52
  53 private:
  54     virtual int doMatch(ACLChecklist *checklist, Nodes::const_iterator start) const;
  55 };
  56
  57 /// An inner ACL expression tree node representing a boolean disjuction (OR)
  58 /// operator applied to a list of child tree nodes.
  59 /// For example, conditions expressed by multiple http_access lines are ORed.
  60 class OrNode: public InnerNode
  61 {
  62     MEMPROXY_CLASS(OrNode);
  63
  64 public:
  65     /// whether the given rule should be excluded from matching tests based
  66     /// on its action
  67     virtual bool bannedAction(ACLChecklist *, Nodes::const_iterator) const;
  68
  69     /* ACL API */
  70     virtual char const *typeString() const;
  71     virtual ACL *clone() const;
  72     virtual void parse();
  73
  74 protected:
  75     mutable Nodes::const_iterator lastMatch_;
  76
  77 private:
  78     virtual int doMatch(ACLChecklist *checklist, Nodes::const_iterator start) const;
  79 };
  80
  81 } // namespace Acl
  82
  83 #endif /* SQUID_ACL_LOGIC_H */
  84