src/acl/MaxConnection.cc

   1 /*
   2  * Copyright (C) 1996-2017 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 /* DEBUG: section 28    Access Control */
  10
  11 #include "squid.h"
  12 #include "acl/FilledChecklist.h"
  13 #include "acl/MaxConnection.h"
  14 #include "client_db.h"
  15 #include "Debug.h"
  16 #include "SquidConfig.h"
  17
  18 ACL *
  19 ACLMaxConnection::clone() const
  20 {
  21     return new ACLMaxConnection(*this);
  22 }
  23
  24 ACLMaxConnection::ACLMaxConnection (char const *theClass) : class_ (theClass), limit(-1)
  25 {}
  26
  27 ACLMaxConnection::ACLMaxConnection (ACLMaxConnection const & old) :class_ (old.class_), limit (old.limit)
  28 {}
  29
  30 ACLMaxConnection::~ACLMaxConnection()
  31 {}
  32
  33 char const *
  34 ACLMaxConnection::typeString() const
  35 {
  36     return class_;
  37 }
  38
  39 bool
  40 ACLMaxConnection::empty () const
  41 {
  42     return false;
  43 }
  44
  45 bool
  46 ACLMaxConnection::valid () const
  47 {
  48     return limit > 0;
  49 }
  50
  51 void
  52 ACLMaxConnection::parse()
  53 {
  54     char *t = ConfigParser::strtokFile();
  55
  56     if (!t)
  57         return;
  58
  59     limit = (atoi (t));
  60
  61     /* suck out file contents */
  62     // ignore comments
  63     bool ignore = false;
  64     while ((t = ConfigParser::strtokFile())) {
  65         ignore |= (*t != '#');
  66
  67         if (ignore)
  68             continue;
  69
  70         debugs(89, DBG_CRITICAL, "WARNING: max_conn only accepts a single limit value.");
  71         limit = 0;
  72     }
  73 }
  74
  75 int
  76 ACLMaxConnection::match(ACLChecklist *checklist)
  77 {
  78     return clientdbEstablished(Filled(checklist)->src_addr, 0) > limit ? 1 : 0;
  79 }
  80
  81 SBufList
  82 ACLMaxConnection::dump() const
  83 {
  84     SBufList sl;
  85     if (!limit)
  86         return sl;
  87
  88     SBuf s;
  89     s.Printf("%d", limit);
  90     sl.push_back(s);
  91     return sl;
  92 }
  93
  94 void
  95 ACLMaxConnection::prepareForUse()
  96 {
  97     if (0 != Config.onoff.client_db)
  98         return;
  99
 100     debugs(22, DBG_CRITICAL, "WARNING: 'maxconn' ACL (" << name << ") won't work with client_db disabled");
 101 }
 102