/*
 * Copyright (C) 1996-2017 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 "cache_cf.h"
#include "client_db.h"
#include "Debug.h"
#include "SquidConfig.h"

ACL *
ACLMaxConnection::clone() const
{
    return new ACLMaxConnection(*this);
}

ACLMaxConnection::ACLMaxConnection (char const *theClass) : class_ (theClass), limit(-1)
{}

ACLMaxConnection::ACLMaxConnection (ACLMaxConnection const & old) :class_ (old.class_), limit (old.limit)
{}

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 = strtokFile();

    if (!t)
        return;

    limit = (atoi (t));

    /* suck out file contents */
    // ignore comments
    bool ignore = false;
    while ((t = 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");
}