modules/ssl/ssl_expr.c

/*                      _             _
**  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
** | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
** | | | | | | (_) | (_| |   \__ \__ \ |  www.modssl.org
** |_| |_| |_|\___/ \__,_|___|___/___/_|  ftp.modssl.org
**                      |_____|
**  ssl_expr.c
**  Expression Handling
*/

/* ====================================================================
 * Copyright (c) 1998-2001 Ralf S. Engelschall. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by
 *     Ralf S. Engelschall <rse@engelschall.com> for use in the
 *     mod_ssl project (http://www.modssl.org/)."
 *
 * 4. The names "mod_ssl" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    rse@engelschall.com.
 *
 * 5. Products derived from this software may not be called "mod_ssl"
 *    nor may "mod_ssl" appear in their names without prior
 *    written permission of Ralf S. Engelschall.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by
 *     Ralf S. Engelschall <rse@engelschall.com> for use in the
 *     mod_ssl project (http://www.modssl.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY RALF S. ENGELSCHALL ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL RALF S. ENGELSCHALL OR
 * HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */
                             /* ``It is hard to fly with
                                  the eagles when you work
                                  with the turkeys.''
                                          -- Unknown  */
#include "mod_ssl.h"


/*  _________________________________________________________________
**
**  Expression Handling
**  _________________________________________________________________
*/

ssl_expr_info_type ssl_expr_info;
char              *ssl_expr_error;

ssl_expr *ssl_expr_comp(pool *p, char *expr)
{
    ssl_expr_info.pool       = p;
    ssl_expr_info.inputbuf   = expr;
    ssl_expr_info.inputlen   = strlen(expr);
    ssl_expr_info.inputptr   = ssl_expr_info.inputbuf;
    ssl_expr_info.expr       = FALSE;

    ssl_expr_error = NULL;
    if (ssl_expr_yyparse())
        return NULL;
    return ssl_expr_info.expr;
}

char *ssl_expr_get_error(void)
{
    if (ssl_expr_error == NULL)
        return "";
    return ssl_expr_error;
}

ssl_expr *ssl_expr_make(ssl_expr_node_op op, void *a1, void *a2)
{
    ssl_expr *node;

    node = (ssl_expr *)ap_palloc(ssl_expr_info.pool, sizeof(ssl_expr));
    node->node_op   = op;
    node->node_arg1 = (char *)a1;
    node->node_arg2 = (char *)a2;
    return node;
}

int ssl_expr_exec(request_rec *r, ssl_expr *expr)
{
    BOOL rc;

    rc = ssl_expr_eval(r, expr);
    if (ssl_expr_error != NULL)
        return (-1);
    else
        return (rc ? 1 : 0);
}