src/acl/MaxConnection.cc

   1 /*
   2  * DEBUG: section 28    Access Control
   3  * AUTHOR: Duane Wessels
   4  *
   5  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   6  * ----------------------------------------------------------
   7  *
   8  *  Squid is the result of efforts by numerous individuals from
   9  *  the Internet community; see the CONTRIBUTORS file for full
  10  *  details.   Many organizations have provided support for Squid's
  11  *  development; see the SPONSORS file for full details.  Squid is
  12  *  Copyrighted (C) 2001 by the Regents of the University of
  13  *  California; see the COPYRIGHT file for full details.  Squid
  14  *  incorporates software developed and/or copyrighted by other
  15  *  sources; see the CREDITS file for full details.
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software
  29  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  30  *
  31  *
  32  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  33  */
  34
  35 #include "squid.h"
  36 #include "acl/FilledChecklist.h"
  37 #include "acl/MaxConnection.h"
  38 #include "cache_cf.h"
  39 #include "client_db.h"
  40 #include "Debug.h"
  41 #include "SquidConfig.h"
  42 #include "wordlist.h"
  43
  44 ACL *
  45 ACLMaxConnection::clone() const
  46 {
  47     return new ACLMaxConnection(*this);
  48 }
  49
  50 ACLMaxConnection::ACLMaxConnection (char const *theClass) : class_ (theClass), limit(-1)
  51 {}
  52
  53 ACLMaxConnection::ACLMaxConnection (ACLMaxConnection const & old) :class_ (old.class_), limit (old.limit)
  54 {}
  55
  56 ACLMaxConnection::~ACLMaxConnection()
  57 {}
  58
  59 char const *
  60 ACLMaxConnection::typeString() const
  61 {
  62     return class_;
  63 }
  64
  65 bool
  66 ACLMaxConnection::empty () const
  67 {
  68     return false;
  69 }
  70
  71 bool
  72 ACLMaxConnection::valid () const
  73 {
  74     return limit > 0;
  75 }
  76
  77 void
  78 ACLMaxConnection::parse()
  79 {
  80     char *t = strtokFile();
  81
  82     if (!t)
  83         return;
  84
  85     limit = (atoi (t));
  86
  87     /* suck out file contents */
  88
  89     while ((t = strtokFile())) {
  90         limit = 0;
  91     }
  92 }
  93
  94 int
  95 ACLMaxConnection::match(ACLChecklist *checklist)
  96 {
  97     return clientdbEstablished(Filled(checklist)->src_addr, 0) > limit ? 1 : 0;
  98 }
  99
 100 wordlist *
 101 ACLMaxConnection::dump() const
 102 {
 103     if (!limit)
 104         return NULL;
 105
 106     wordlist *W = NULL;
 107
 108     char buf[32];
 109
 110     snprintf(buf, sizeof(buf), "%d", limit);
 111
 112     wordlistAdd(&W, buf);
 113
 114     return W;
 115 }
 116
 117 void
 118 ACLMaxConnection::prepareForUse()
 119 {
 120     if (0 != Config.onoff.client_db)
 121         return;
 122
 123     debugs(22, DBG_CRITICAL, "WARNING: 'maxconn' ACL (" << name << ") won't work with client_db disabled");
 124 }