/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  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. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``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 THE APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software
 * originally written at the National Center for Supercomputing Applications,
 * University of Illinois, Urbana-Champaign.
 */

#include "httpd.h"
#include "http_config.h"
#include <nwadv.h>

module MODULE_VAR_EXPORT nlm_module;
static int been_there_done_that = 0; /* Loaded the modules yet? */

static const char *load_module(cmd_parms *cmd, void *dummy, char *modname, char *filename)
{
    module *modp;
    int nlmHandle;
    const char *szModuleFile = ap_server_root_relative(cmd->pool, filename);

    if (been_there_done_that)
        return NULL;

	nlmHandle = FindNLMHandle(filename);

    if (nlmHandle == NULL) {
        spawnlp(P_NOWAIT, szModuleFile, NULL);
        nlmHandle = FindNLMHandle(filename);

        if (nlmHandle == NULL)
            return ap_pstrcat(cmd->pool, "Cannot load ", szModuleFile,
                              " into server", NULL);
    }

    modp = (module *) ImportSymbol(nlmHandle, modname);

    if (!modp)
        return ap_pstrcat(cmd->pool, "Can't find module ", modname,
                          " in file ", filename, NULL);
	
    ap_add_module(modp);

    if (modp->create_server_config)
        ((void**)cmd->server->module_config)[modp->module_index] =
         (*modp->create_server_config)(cmd->pool, cmd->server);

    if (modp->create_dir_config)
        ((void**)cmd->server->lookup_defaults)[modp->module_index] =
         (*modp->create_dir_config)(cmd->pool, NULL);

    return NULL;
}

static const char *load_file(cmd_parms *cmd, void *dummy, char *filename)
{
    if (been_there_done_that)
        return NULL;

    if (spawnlp(P_NOWAIT, ap_server_root_relative(cmd->pool, filename), NULL))
        return ap_pstrcat(cmd->pool, "Cannot load ", filename, " into server", NULL);

    return NULL;
}

void check_loaded_modules(server_rec *dummy, pool *p)
{
    if (been_there_done_that)
        return;

    been_there_done_that = 1;
}

command_rec nlm_cmds[] = {
{ "LoadModule", load_module, NULL, RSRC_CONF, TAKE2,
  "a module name, and the name of a file to load it from"},
{ "LoadFile", load_file, NULL, RSRC_CONF, ITERATE,
  "files or libraries to link into the server at runtime"},
{ NULL }
};

module nlm_module = {
   STANDARD_MODULE_STUFF,
   check_loaded_modules,  /* initializer */
   NULL,                  /* create per-dir config */
   NULL,                  /* merge per-dir config */
   NULL,                  /* server config */
   NULL,                  /* merge server config */
   nlm_cmds,              /* command table */
   NULL,                  /* handlers */
   NULL,                  /* filename translation */
   NULL,                  /* check_user_id */
   NULL,                  /* check auth */
   NULL,                  /* check access */
   NULL,                  /* type_checker */
   NULL,                  /* logger */
   NULL                   /* header parser */
};

