MaxConnection.cc

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/*
 * Copyright (C) 1996-2025 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
/* DEBUG: section 28    Access Control */
 
#include "squid.h"
#include "acl/FilledChecklist.h"
#include "acl/MaxConnection.h"
#include "client_db.h"
#include "debug/Stream.h"
#include "SquidConfig.h"
 
ACLMaxConnection::ACLMaxConnection (char const *theClass) : class_ (theClass), limit(-1)
{}
 
ACLMaxConnection::~ACLMaxConnection()
{}
 
char const *
ACLMaxConnection::typeString() const
{
    return class_;
}
 
bool
ACLMaxConnection::empty () const
{
    return false;
}
 
bool
ACLMaxConnection::valid () const
{
    return limit > 0;
}
 
void
ACLMaxConnection::parse()
{
    char *t = ConfigParser::strtokFile();
 
    if (!t)
        return;
 
    limit = (atoi (t));
 
    /* suck out file contents */
    // ignore comments
    bool ignore = false;
    while ((t = ConfigParser::strtokFile())) {
        ignore |= (*t != '#');
 
        if (ignore)
            continue;
 
        debugs(89, DBG_CRITICAL, "WARNING: max_conn only accepts a single limit value.");
        limit = 0;
    }
}
 
int
ACLMaxConnection::match(ACLChecklist *checklist)
{
    return clientdbEstablished(Filled(checklist)->src_addr, 0) > limit ? 1 : 0;
}
 
SBufList
ACLMaxConnection::dump() const
{
    SBufList sl;
    if (!limit)
        return sl;
 
    SBuf s;
    s.Printf("%d", limit);
    sl.push_back(s);
    return sl;
}
 
void
ACLMaxConnection::prepareForUse()
{
    if (0 != Config.onoff.client_db)
        return;
 
    debugs(22, DBG_CRITICAL, "WARNING: 'maxconn' ACL (" << name << ") won't work with client_db disabled");
}