cs_config.c

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "cs_config.h"

/*--------------------------------------------------------------------------*/
/*                                                                          */
/* These routines are strictly internal to this module, and support its     */
/* operation.  They are not referenced by any external portion of the       */
/* server.                                                                  */
/*                                                                          */
/*--------------------------------------------------------------------------*/

/*
 * Locate our directory configuration record for the current request.
 */
cs_cfg *our_dconfig(const request_rec *cpt_R)
{
    return (cs_cfg *) ap_get_module_config(cpt_R->per_dir_config, &g_ContextsplitModule);
}

/*
 * Locate our server configuration record for the specified server.
 */
cs_cfg *our_sconfig(const server_rec *cpt_S)
{
    return (cs_cfg *) ap_get_module_config(cpt_S->module_config, &g_ContextsplitModule);
}

/*
 * Likewise for our configuration record for the specified request.
 */
cs_cfg *our_rconfig(const request_rec *cpt_R)
{
    return (cs_cfg *) ap_get_module_config(cpt_R->request_config, &g_ContextsplitModule);
}

/*
 * Likewise for our configuration record for a connection.
 */
cs_cfg *our_cconfig(const conn_rec *cpt_C)
{
    return (cs_cfg *) ap_get_module_config(cpt_C->conn_config, &g_ContextsplitModule);
}

/*
 * This function gets called to create a per-directory configuration
 * record.  This will be called for the "default" server environment, and for
 * each directory for which the parser finds any of our directives applicable.
 * If a directory doesn't have any of our directives involved (i.e., they
 * aren't in the .htaccess file, or a <Location>, <Directory>, or related
 * block), this routine will *not* be called - the configuration for the
 * closest ancestor is used.
 *
 * The return value is a pointer to the created module-specific
 * structure.
 */
void * cs_create_dir_config(apr_pool_t *p, char *dirspec)
{
    cs_cfg *pt_Cfg;
    char *ps_Dname = dirspec;
    char *ps_Note;

    /*
     * Allocate the space for our record from the pool supplied.
     */
    pt_Cfg = (cs_cfg *) apr_pcalloc(p, sizeof(cs_cfg));

#if 0
    /*
     * Now fill in the defaults.  If there are any `parent' configuration
     * records, they'll get merged as part of a separate callback.
     */
    cfg->local = 0;
    cfg->congenital = 0;
    cfg->cmode = CONFIG_MODE_DIRECTORY;
#endif

    /*
     * Finally, add our trace to the callback list.
     */
    ps_Dname = (ps_Dname != NULL) ? ps_Dname : "";
    /*cfg->loc = apr_pstrcat(p, "DIR(", dname, ")", NULL);*/
    ps_Note = apr_psprintf(p, "x_create_dir_config(p == %pp, dirspec == %s)",
                        (void*) p, ps_Dname);
    /*trace_startup(p, NULL, cfg, note);*/
    return (void *) pt_Cfg;
}

/*
 * This function gets called to merge two per-directory configuration
 * records.  This is typically done to cope with things like .htaccess files
 * or <Location> directives for directories that are beneath one for which a
 * configuration record was already created.  The routine has the
 * responsibility of creating a new record and merging the contents of the
 * other two into it appropriately.  If the module doesn't declare a merge
 * routine, the record for the closest ancestor location (that has one) is
 * used exclusively.
 *
 * The routine MUST NOT modify any of its arguments!
 *
 * The return value is a pointer to the created module-specific structure
 * containing the merged values.
 */
void *cs_merge_dir_config(apr_pool_t *p, void *pv_ParentConf,
                                      void *pv_NewlocConf)
{

    cs_cfg *pt_MergedConfig = (cs_cfg *) apr_pcalloc(p, sizeof(cs_cfg));
    const cs_cfg *pt_Pconf = (cs_cfg *) pv_ParentConf;
    const cs_cfg *pt_Nconf = (cs_cfg *) pv_NewlocConf;
    char *ps_Note;

    /*
     * Now just record our being called in the trace list.  Include the
     * locations we were asked to merge.
     */
    ps_Note = apr_psprintf(p, "x_merge_dir_config(p == %pp, parent_conf == "
                        "%pp, newloc_conf == %pp)", (void*) p,
                        (void*) pv_ParentConf, (void*) pv_NewlocConf);
    //trace_startup(p, NULL, merged_config, note);
    return (void *) pt_MergedConfig;
}

/*
 * This function gets called to create a per-server configuration
 * record.  It will always be called for the "default" server.
 *
 * The return value is a pointer to the created module-specific
 * structure.
 */
void *cs_create_server_config(apr_pool_t *p, server_rec *pt_S)
{

    cs_cfg *pt_Cfg;
    char *ps_SName = pt_S->server_hostname;

    /*
     * As with the x_create_dir_config() reoutine, we allocate and fill
     * in an empty record.
     */
    pt_Cfg = (cs_cfg *) apr_pcalloc(p, sizeof(cs_cfg));
#if 0
    cfg->local = 0;
    cfg->congenital = 0;
    cfg->cmode = CONFIG_MODE_SERVER;
#endif

    /*
     * Note that we were called in the trace list.
     */
    ps_SName = (ps_SName != NULL) ? ps_SName : "";
    /*trace_startup(p, s, cfg, "x_create_server_config()");*/
    return (void *) pt_Cfg;
}

/*
 * This function gets called to merge two per-server configuration
 * records.  This is typically done to cope with things like virtual hosts and
 * the default server configuration  The routine has the responsibility of
 * creating a new record and merging the contents of the other two into it
 * appropriately.  If the module doesn't declare a merge routine, the more
 * specific existing record is used exclusively.
 *
 * The routine MUST NOT modify any of its arguments!
 *
 * The return value is a pointer to the created module-specific structure
 * containing the merged values.
 */
void *cs_merge_server_config(apr_pool_t *p, void *pv_Server1Conf,
                                         void *pv_Server2Conf)
{

    cs_cfg *pt_MergedConfig = (cs_cfg *) apr_pcalloc(p, sizeof(cs_cfg));
    cs_cfg *pt_S1conf = (cs_cfg *) pv_Server1Conf;
    cs_cfg *pt_S2conf = (cs_cfg *) pv_Server2Conf;
    char *ps_Note;

    /*
     * Our inheritance rules are our own, and part of our module's semantics.
     * Basically, just note whence we came.
     */

    return (void *) pt_MergedConfig;
}

/*--------------------------------------------------------------------------*/
/*                                                                          */
/* The following pseudo-prototype declarations illustrate the parameters    */
/* passed to command handlers for the different types of directive          */
/* syntax.  If an argument was specified in the directive definition        */
/* (look for "command_rec" below), it's available to the command handler    */
/* via the (void *) info field in the cmd_parms argument passed to the      */
/* handler (cmd->info for the examples below).                              */
/*                                                                          */
/*--------------------------------------------------------------------------*/

/*
 * Command handler for a NO_ARGS directive.  Declared in the command_rec
 * list with
 *   AP_INIT_NO_ARGS("directive", function, mconfig, where, help)
 *
 * static const char *handle_NO_ARGS(cmd_parms *cmd, void *mconfig);
 */

/*
 * Command handler for a RAW_ARGS directive.  The "args" argument is the text
 * of the commandline following the directive itself.  Declared in the
 * command_rec list with
 *   AP_INIT_RAW_ARGS("directive", function, mconfig, where, help)
 *
 * static const char *handle_RAW_ARGS(cmd_parms *cmd, void *mconfig,
 *                                    const char *args);
 */

/*
 * Command handler for a FLAG directive.  The single parameter is passed in
 * "bool", which is either zero or not for Off or On respectively.
 * Declared in the command_rec list with
 *   AP_INIT_FLAG("directive", function, mconfig, where, help)
 *
 * static const char *handle_FLAG(cmd_parms *cmd, void *mconfig, int bool);
 */

/*
 * Command handler for a TAKE1 directive.  The single parameter is passed in
 * "word1".  Declared in the command_rec list with
 *   AP_INIT_TAKE1("directive", function, mconfig, where, help)
 *
 * static const char *handle_TAKE1(cmd_parms *cmd, void *mconfig,
 *                                 char *word1);
 */

/*
 * Command handler for a TAKE2 directive.  TAKE2 commands must always have
 * exactly two arguments.  Declared in the command_rec list with
 *   AP_INIT_TAKE2("directive", function, mconfig, where, help)
 *
 * static const char *handle_TAKE2(cmd_parms *cmd, void *mconfig,
 *                                 char *word1, char *word2);
 */

/*
 * Command handler for a TAKE3 directive.  Like TAKE2, these must have exactly
 * three arguments, or the parser complains and doesn't bother calling us.
 * Declared in the command_rec list with
 *   AP_INIT_TAKE3("directive", function, mconfig, where, help)
 *
 * static const char *handle_TAKE3(cmd_parms *cmd, void *mconfig,
 *                                 char *word1, char *word2, char *word3);
 */

/*
 * Command handler for a TAKE12 directive.  These can take either one or two
 * arguments.
 * - word2 is a NULL pointer if no second argument was specified.
 * Declared in the command_rec list with
 *   AP_INIT_TAKE12("directive", function, mconfig, where, help)
 *
 * static const char *handle_TAKE12(cmd_parms *cmd, void *mconfig,
 *                                  char *word1, char *word2);
 */

/*
 * Command handler for a TAKE123 directive.  A TAKE123 directive can be given,
 * as might be expected, one, two, or three arguments.
 * - word2 is a NULL pointer if no second argument was specified.
 * - word3 is a NULL pointer if no third argument was specified.
 * Declared in the command_rec list with
 *   AP_INIT_TAKE123("directive", function, mconfig, where, help)
 *
 * static const char *handle_TAKE123(cmd_parms *cmd, void *mconfig,
 *                                   char *word1, char *word2, char *word3);
 */

/*
 * Command handler for a TAKE13 directive.  Either one or three arguments are
 * permitted - no two-parameters-only syntax is allowed.
 * - word2 and word3 are NULL pointers if only one argument was specified.
 * Declared in the command_rec list with
 *   AP_INIT_TAKE13("directive", function, mconfig, where, help)
 *
 * static const char *handle_TAKE13(cmd_parms *cmd, void *mconfig,
 *                                  char *word1, char *word2, char *word3);
 */

/*
 * Command handler for a TAKE23 directive.  At least two and as many as three
 * arguments must be specified.
 * - word3 is a NULL pointer if no third argument was specified.
 * Declared in the command_rec list with
 *   AP_INIT_TAKE23("directive", function, mconfig, where, help)
 *
 * static const char *handle_TAKE23(cmd_parms *cmd, void *mconfig,
 *                                  char *word1, char *word2, char *word3);
 */

/*
 * Command handler for a ITERATE directive.
 * - Handler is called once for each of n arguments given to the directive.
 * - word1 points to each argument in turn.
 * Declared in the command_rec list with
 *   AP_INIT_ITERATE("directive", function, mconfig, where, help)
 *
 * static const char *handle_ITERATE(cmd_parms *cmd, void *mconfig,
 *                                   char *word1);
 */

/*
 * Command handler for a ITERATE2 directive.
 * - Handler is called once for each of the second and subsequent arguments
 *   given to the directive.
 * - word1 is the same for each call for a particular directive instance (the
 *   first argument).
 * - word2 points to each of the second and subsequent arguments in turn.
 * Declared in the command_rec list with
 *   AP_INIT_ITERATE2("directive", function, mconfig, where, help)
 *
 * static const char *handle_ITERATE2(cmd_parms *cmd, void *mconfig,
 *                                    char *word1, char *word2);
 */

#if 0
/*--------------------------------------------------------------------------*/
/* We prototyped the various syntax for command handlers (routines that     */
/* are called when the configuration parser detects a directive declared    */
/* by our module) earlier.  Now we actually declare a "real" routine that   */
/* will be invoked by the parser when our "real" directive is               */
/* encountered.                                                             */
/*                                                                          */
/* If a command handler encounters a problem processing the directive, it   */
/* signals this fact by returning a non-NULL pointer to a string            */
/* describing the problem.                                                  */
/*                                                                          */
/* The magic return value DECLINE_CMD is used to deal with directives       */
/* that might be declared by multiple modules.  If the command handler      */
/* returns NULL, the directive was processed; if it returns DECLINE_CMD,    */
/* the next module (if any) that declares the directive is given a chance   */
/* at it.  If it returns any other value, it's treated as the text of an    */
/* error message.                                                           */
/*--------------------------------------------------------------------------*/
/*
 * Command handler for the NO_ARGS "Example" directive.  All we do is mark the
 * call in the trace log, and flag the applicability of the directive to the
 * current location in that location's configuration record.
 */
static const char *cmd_example(cmd_parms *cmd, void *mconfig)
{
    cs_cfg *cfg = (cs_cfg *) mconfig;

    trace_startup(cmd->pool, cmd->server, cfg, "cmd_example()");
    return NULL;
}
#endif