src/acl/MaxConnection.cc

   1 /*
   2  * Copyright (C) 1996-2014 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 "cache_cf.h"
  15 #include "client_db.h"
  16 #include "Debug.h"
  17 #include "SquidConfig.h"
  18
  19 ACL *
  20 ACLMaxConnection::clone() const
  21 {
  22     return new ACLMaxConnection(*this);
  23 }
  24
  25 ACLMaxConnection::ACLMaxConnection (char const *theClass) : class_ (theClass), limit(-1)
  26 {}
  27
  28 ACLMaxConnection::ACLMaxConnection (ACLMaxConnection const & old) :class_ (old.class_), limit (old.limit)
  29 {}
  30
  31 ACLMaxConnection::~ACLMaxConnection()
  32 {}
  33
  34 char const *
  35 ACLMaxConnection::typeString() const
  36 {
  37     return class_;
  38 }
  39
  40 bool
  41 ACLMaxConnection::empty () const
  42 {
  43     return false;
  44 }
  45
  46 bool
  47 ACLMaxConnection::valid () const
  48 {
  49     return limit > 0;
  50 }
  51
  52 void
  53 ACLMaxConnection::parse()
  54 {
  55     char *t = strtokFile();
  56
  57     if (!t)
  58         return;
  59
  60     limit = (atoi (t));
  61
  62     /* suck out file contents */
  63     // ignore comments
  64     bool ignore = false;
  65     while ((t = strtokFile())) {
  66         ignore |= (*t != '#');
  67
  68         if (ignore)
  69             continue;
  70
  71         debugs(89, DBG_CRITICAL, "WARNING: max_conn only accepts a single limit value.");
  72         limit = 0;
  73     }
  74 }
  75
  76 int
  77 ACLMaxConnection::match(ACLChecklist *checklist)
  78 {
  79     return clientdbEstablished(Filled(checklist)->src_addr, 0) > limit ? 1 : 0;
  80 }
  81
  82 SBufList
  83 ACLMaxConnection::dump() const
  84 {
  85     SBufList sl;
  86     if (!limit)
  87         return sl;
  88
  89     SBuf s;
  90     s.Printf("%d", limit);
  91     sl.push_back(s);
  92     return sl;
  93 }
  94
  95 void
  96 ACLMaxConnection::prepareForUse()
  97 {
  98     if (0 != Config.onoff.client_db)
  99         return;
 100
 101     debugs(22, DBG_CRITICAL, "WARNING: 'maxconn' ACL (" << name << ") won't work with client_db disabled");
 102 }