aux-items.c 60.3 KB
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/*
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 * $Id: aux-items.c,v 1.39 2001/12/30 22:32:54 ceder Exp $
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 * Copyright (C) 1994-2001  Lysator Academic Computer Association.
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 *
 * This file is part of the LysKOM server.
 * 
 * LysKOM is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 1, or (at your option) 
 * any later version.
 * 
 * LysKOM is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with LysKOM; see the file COPYING.  If not, write to
 * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
 * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
 * MA 02139, USA.
 *
 * Please mail bug reports to bug-lyskom@lysator.liu.se. 
 */

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#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

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#include <stdio.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#include <setjmp.h>
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#include <assert.h>
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#include "kom-types.h"
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#include "com.h"
#include "async.h"
#include "connections.h"
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#include "manipulate.h"
#include "aux-items.h"
#include "kom-errno.h"
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#include "kom-memory.h"
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#include "server/smalloc.h"
#include "cache.h"
#include "s-string.h"
#include "lyskomd.h"
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#include "kom-config.h"
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#include "regex.h"
#include "log.h"
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#include "services.h"
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#include "admin.h"
#include "param.h"
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#include "server-time.h"
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#include "string-malloc.h"
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#define AUX_ADJUST_FLAG(flg) item->flags.flg = (def->clear_flags.flg)?0:((def->set_flags.flg)?1:item->flags.flg)

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/* Externally accessible variables (used by the parser) */

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Aux_item_definition     *aux_item_definition_list = NULL;
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unsigned long            num_aux_item_definitions = 0; 

/* Variables local to this file */

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#if COMPILED_AUX_ITEMS
static Aux_item_definition compiled_aux_items[] = {};
#endif
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/* Forward declaration of triggers */

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static void aux_item_trigger_mark_text(Aux_item_trigger_data *);
static void aux_item_trigger_unmark_text(Aux_item_trigger_data *);
static void aux_item_trigger_mirror_faq(Aux_item_trigger_data *);
static void aux_item_trigger_link_item(Aux_item_trigger_data *data);
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/* Forward declarations of validators */

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static Bool aux_item_validate_existing_text(Aux_item_validation_data *data);

/* Other forward declarations */
static const Aux_item *
find_aux_item(const Aux_item_list *list, unsigned long aux_no);
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static void prepare_aux_item(Aux_item *item, Pers_no creator,
			     const Aux_item_definition *def);

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/* Symbol table for the triggers */
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static Aux_item_trigger_mapping
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aux_item_triggers [] =
{
    { "mark-text", aux_item_trigger_mark_text },
    { "unmark-text", aux_item_trigger_unmark_text },
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    { "link-faq", aux_item_trigger_mirror_faq },
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    { "link-item", aux_item_trigger_link_item },
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    { NULL, NULL }
};

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/* Symbol table for the validators */

static Aux_item_validator_mapping
aux_item_validators [] =
{
    { "existing-readable-text", aux_item_validate_existing_text },
    { NULL, NULL }
};


/* Use this to initialize an empty definition */

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Aux_item_definition empty_aux_item_definition =
{
    NULL,                   /* Name */           
    0,                      /* Tag */            
    { 0,0,0,0,0,0,0,0 },    /* Clear flags */    
    { 0,0,0,0,0,0,0,0 },    /* Set flags */      
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    0,                      /* Disabled */
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    0,                      /* Author only */    
    0,                      /* Supervisor only */
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    0,                      /* System only */
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    0,                      /* Unique */         
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    0,                      /* Can't delete */
    0,                      /* Owner delete */
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    0,                      /* Inherit limit */  
    FALSE,                  /* Texts */
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    0,
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    FALSE,                  /* Confs */
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    0,
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    FALSE,                  /* Letterbox */
    FALSE,                  /* System */
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    0,                      /* Number of validators */
    NULL,                   /* Validator list */
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    0, NULL,
    0, NULL,
    0, NULL,
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    NULL                    /* Next */
};

    


/*
 * simple_aux_item is the default definition for simple
 * items (non-reserved tags)
 */

static Aux_item_definition simple_aux_item =
{
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    (char*)"simple",        /* Name */           
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    0,                      /* Tag */            
    { 0,0,0,0,0,0,0,0 },    /* Clear flags */    
    { 0,0,0,0,0,0,0,0 },    /* Set flags */      
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    0,                      /* Disabled */
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    0,                      /* Author only */    
    0,                      /* Supervisor only */
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    0,                      /* System only */
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    0,                      /* Unique */         
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    0,                      /* Can't delete */
    0,                      /* Owner delete */
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    0,                      /* Inherit limit */  
    TRUE,                   /* Texts */
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    0,
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    TRUE,                   /* Confs */
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    0,
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    TRUE,                   /* Letterbox */
    TRUE,                   /* System */
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    0, NULL,                /* Validators */
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    0, NULL,                /* Add triggers */
    0, NULL,                /* Delete triggers */
    0, NULL,                /* Undelete triggers */
    NULL
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};


/* Forward declarations */

static Bool
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aux_item_check_unique(const Aux_item *item,
                      const Aux_item_definition *xdef,
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                      Aux_item_list *add_to_list,
                      unsigned long start_looking_at);


/*
 * aux_item_default_definition
 *
 * Return the default definition of ITEM or NULL if ITEM cannot
 * be created without an explicit definition
 */

static Aux_item_definition *
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aux_item_default_definition(const Aux_item *item)
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{
    /* A predefined aux_item that we didn't find a definition for is
       illegal. */

    if (AUX_IS_ILLEGAL(item->tag))
        return NULL;

    if (AUX_IS_PREDEFINED(item->tag))
        return NULL;

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    return &simple_aux_item;
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}


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/*
 * aux_item_find_trigger
 */

Aux_item_trigger
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aux_item_find_trigger(const char *trigger_name)
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{
    unsigned long i = 0;

    while (aux_item_triggers[i].name != NULL)
    {
        if (!strcmp(aux_item_triggers[i].name, trigger_name))
            return aux_item_triggers[i].function;
        i += 1;
    }
    return NULL;
}

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Aux_item_validation_function
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aux_item_find_validator(const char *validator_name)
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{
    unsigned long i = 0;

    while (aux_item_validators[i].name != NULL)
    {
        if (!strcmp(aux_item_validators[i].name, validator_name))
            return aux_item_validators[i].function;
        i += 1;
    }
    return NULL;
}


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/*
 * find_aux_item_definition
 *
 * Return the definition of ITEM or NULL if it does not
 * have a valid information.
 */

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static const Aux_item_definition *
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find_aux_item_definition(const Aux_item *item)
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{
    Aux_item_definition *def;

    def = aux_item_definition_list;
    while (def != NULL)
    {
        if (def->tag == item->tag)
            return def;
        def = def->next;
    }

    return aux_item_default_definition(item);
}


/* 
 * ======================================================================
 * UTILITY FUNCTIONS
 * ======================================================================
 */
 
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/* TRIGGER THINGS */


static void
aux_item_fix_trigger_data(Aux_item_trigger_data *data)
{
    switch (data->object_type)
    {
    case TEXT_OBJECT_TYPE:
        data->item = &((Text_stat *)data->object)->aux_item_list.items[data->item_index];
        break;
    case CONF_OBJECT_TYPE:
        data->item = &((Conference *)data->object)->aux_item_list.items[data->item_index];
        break;
    case INFO_OBJECT_TYPE:
        data->item = &((Info *)data->object)->aux_item_list.items[data->item_index];
        break;

    default:
        break;
    }
}


static void
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aux_item_call_add_triggers(const Aux_item_definition *def,
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			   enum object_type object_type,
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			   unsigned long item_index,
			   unsigned long integer_argument,
			   void     * pointer_argument,
                           Aux_item * item)
{
    unsigned long i;
    Aux_item_trigger_data data;
    
    data.action = AUX_ITEM_ADD_ACTION;
    data.object_type = object_type;
    data.item_index = item_index;
    data.object_no = integer_argument;
    data.object = pointer_argument;
    data.item = item;

    for (i = 0; i < def->num_add_triggers; i++)
    {
        (*(def->add_triggers[i]))(&data);
        aux_item_fix_trigger_data(&data);
    }
}

static void
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aux_item_call_delete_triggers(const Aux_item_definition *def,
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                              enum object_type object_type,
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                              unsigned long item_index,
                              unsigned long integer_argument,
                              void     * pointer_argument,
                              Aux_item *item)
{
    unsigned long i;
    Aux_item_trigger_data data;
    
    data.action = AUX_ITEM_DELETE_ACTION;
    data.object_type = object_type;
    data.item_index = item_index;
    data.object_no = integer_argument;
    data.object = pointer_argument;
    data.item = item;

    for (i = 0; i < def->num_delete_triggers; i++)
    {
        (*(def->delete_triggers[i]))(&data);
    }
}

static void
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aux_item_call_undelete_triggers(const Aux_item_definition *def,
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				enum object_type object_type,
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				unsigned long item_index,
				unsigned long integer_argument,
				void     * pointer_argument,
                                Aux_item * item)
{
    unsigned long i;
    Aux_item_trigger_data data;
    
    data.action = AUX_ITEM_UNDELETE_ACTION;
    data.object_type = object_type;
    data.item_index = item_index;
    data.object_no = integer_argument;
    data.object = pointer_argument;
    data.item = item;

    for (i = 0; i < def->num_undelete_triggers; i++)
    {
        (*(def->undelete_triggers[i]))(&data);
    }
}



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/*
 * initialize_aux_items
 *
 * Initialize this code and its data structures
 */

void
aux_item_definition_add(Aux_item_definition *def)
{
    Aux_item_definition     *new_definition;

    new_definition = smalloc(sizeof(Aux_item_definition));
    if (new_definition == NULL)
    {
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        restart_kom("out of memory adding aux-item definition");
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    }
    *new_definition = *def;
    num_aux_item_definitions += 1;

    new_definition->next = aux_item_definition_list;
    aux_item_definition_list = new_definition;
}

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/*
 * Compile the verification regexp for the definition in DEF
 * and put the result somewhere convenient.
 */

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static void
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aux_item_definition_cache_regexp(const Aux_item_definition *def,
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                                 unsigned long ix)
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{
    struct re_pattern_buffer   *pat_buf;
    const char                 *errmsg;

    re_syntax_options = RE_SYNTAX_POSIX_EXTENDED;
            
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    def->validators[ix].v.re.cached_re_buf = smalloc(sizeof(*pat_buf));
    if (def->validators[ix].v.re.cached_re_buf == NULL)
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    {
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        kom_log("Out of memory compiling aux-item regexp %lu (%s).\n",
                def->tag,
                def->name);
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        return;
    }
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    pat_buf = def->validators[ix].v.re.cached_re_buf;
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    pat_buf->translate = DEFAULT_COLLAT_TAB;
    pat_buf->translate = NULL;
    pat_buf->fastmap = 0;
    pat_buf->allocated = 0;
    pat_buf->buffer = 0;

    if ((errmsg =
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         re_compile_pattern(def->validators[ix].v.re.regexp,
                            strlen(def->validators[ix].v.re.regexp),
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                            pat_buf))
        != NULL)
    {
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        kom_log("%s in validate regexp of aux-item definition %lu (%s).\n",
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                errmsg,
                def->tag,
                def->name);
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        if (def->validators[ix].v.re.cached_re_buf)
            sfree(def->validators[ix].v.re.cached_re_buf);
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        if (def->validators[ix].v.re.regexp)
            string_free(def->validators[ix].v.re.regexp);
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        def->validators[ix].v.re.cached_re_buf = NULL;
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        def->validators[ix].v.re.regexp = NULL;
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        return;
    }
}

void
initialize_aux_items(char *aux_def_file)
{
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#if COMPILED_AUX_ITEMS
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    unsigned long                i;

    /* Set up precompiled items */
    for (i = 0;
         i < (sizeof(compiled_aux_items)/sizeof(*compiled_aux_items));
         i++)
    {
        aux_item_definition_add(&compiled_aux_items[i]);
    }
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#endif
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    /* Read definitions from configuration file */

    parse_aux_item_definitions(aux_def_file);
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}
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void
free_aux_item_definitions(void)
{
    unsigned long i;
    Aux_item_definition *def;
    Aux_item_definition *tmp;
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    def = aux_item_definition_list;
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    while (def != NULL)
    {
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        string_free(def->name);
        for (i = 0; i < def->num_validators; i++)
        {
            if (def->validators[i].type == AUX_VALIDATE_REGEXP)
            {
                if (def->validators[i].v.re.regexp != NULL)
                    string_free(def->validators[i].v.re.regexp);
                if (def->validators[i].v.re.cached_re_buf != NULL)
                    sfree(def->validators[i].v.re.cached_re_buf);
            }
        }
        if (def->validators != NULL)
        {
            sfree(def->validators);
            def->validators = NULL;
            def->num_validators = 0;
        }
        if (def->add_triggers != NULL)
        {
            sfree(def->add_triggers);
            def->add_triggers = NULL;
            def->num_add_triggers = 0;
        }
        if (def->delete_triggers != NULL)
        {
            sfree(def->delete_triggers);
            def->delete_triggers = NULL;
            def->num_delete_triggers = 0;
        }
        if (def->undelete_triggers != NULL)
        {
            sfree(def->undelete_triggers);
            def->undelete_triggers = NULL;
            def->num_undelete_triggers = 0;
        }
        tmp = def->next;
        sfree(def);
        def = tmp;
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    }
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    aux_item_definition_list = NULL;
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}


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static long
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find_aux_item_index(const Aux_item_list *list, unsigned long aux_no)
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{
    unsigned long i;
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    for (i = 0; i < list->length; i++)
    {
        if (list->items[i].aux_no == aux_no)
            return i;
    }

    return -1;
}


/* Find the aux item list containing the item that ITEM is linked to */

static Aux_item_list *
find_linked_aux_item_list(Aux_item *item)
{
    Text_stat       *text_stat;
    Conference      *conf_stat;
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    switch (item->linked_item.target_type)
    {
    case NO_OBJECT_TYPE:
        return NULL;
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    case TEXT_OBJECT_TYPE:
        GET_T_STAT(text_stat, item->linked_item.target_object.text, NULL);
        return &text_stat->aux_item_list;

    case CONF_OBJECT_TYPE:
        GET_C_STAT(conf_stat, item->linked_item.target_object.conf, NULL);
        return &conf_stat->aux_item_list;

    case INFO_OBJECT_TYPE:
        return &kom_info.aux_item_list;

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#if 0
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    case PERS_OBJECT_TYPE:
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#endif
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    default:
        /* No lists in these items */
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        kom_log("find_linked_aux_item_list: Bad aux_item somewhere: "
		"link to person or other kind.\n");
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        return NULL;
    }
}

/* Find the aux item that ITEM is linked to */

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static const Aux_item *
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find_linked_aux_item(Aux_item *item)
{
    Aux_item_list       *target_list;

    target_list = find_linked_aux_item_list(item);
    if (target_list == NULL)
        return NULL;

    return find_aux_item(target_list, item->linked_item.target_item);
}

/* Mark the object linked to by an aux_item as changed */

static void
mark_linked_object_as_changed(Aux_item *item)
{
    Text_stat       *text_stat;
    Conference      *conf_stat;

    switch (item->linked_item.target_type)
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    {
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    case TEXT_OBJECT_TYPE:
        VOID_GET_T_STAT(text_stat, item->linked_item.target_object.text);
        mark_text_as_changed(item->linked_item.target_object.text);
        break;

    case CONF_OBJECT_TYPE:
        VOID_GET_C_STAT(conf_stat, item->linked_item.target_object.conf);
        mark_conference_as_changed(item->linked_item.target_object.conf);
        break;

    case INFO_OBJECT_TYPE:
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#if 0
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    case PERS_OBJECT_TYPE:
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#endif
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    default:
        /* Need no commit for these objects */
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	;
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    }
}

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/*
 * Utility function for linking aux items. This function will take
 * care of adding the appropriate item to the appropriate list.
 *
 * Note that this may cause aux-item lists to be realloced, so pointers
 * into such lists may become invalid. Take particular care with the
 * pointers in aux-item trigger data
 *
 * Call aux_item_fix_trigger_data if you need to fix the contents of
 * trigger data after calling this function.
 */


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static void
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aux_item_link_items(enum object_type src_type,  /* Source object type */
                    unsigned long    src_no,    /* Source object pointer */
                    void            *src_ptr,   /* Source pointer */
                    Aux_item        *src_item,  /* Source item */

                    enum object_type dst_type,  /* Destination obj type */
                    unsigned long    dst_no,    /* Destination obj pointer */
                    void            *dst_ptr,   /* Destination pointer */
                    Aux_item        *dst_item_data)
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{
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    Aux_item_list       item_list;
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    /* Get a pointer to the destination object */

    if (dst_ptr == NULL)
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    {
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        switch (dst_type)
        {
        case TEXT_OBJECT_TYPE:
            dst_ptr = cached_get_text_stat(dst_no);
            break;
        case CONF_OBJECT_TYPE:
            dst_ptr = cached_get_conf_stat(dst_no);
            break;
        case INFO_OBJECT_TYPE:
            dst_ptr = &kom_info;
            break;
        default:
            break;
        }
    }

    if (dst_ptr == NULL || src_ptr == NULL)
        return;


    /* Set up the linking information in the destination item */

    dst_item_data->linked_item.target_type = src_type;
    dst_item_data->linked_item.target_item = src_item->aux_no;
    switch (src_type)
    {
    case TEXT_OBJECT_TYPE: dst_item_data->linked_item.target_object.text = src_no; break;
    case CONF_OBJECT_TYPE: dst_item_data->linked_item.target_object.conf = src_no; break;
    case INFO_OBJECT_TYPE:
    default:
        dst_item_data->linked_item.target_object.text = 0;
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    }
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    /* Set up the linking information in the source item */

    src_item->linked_item.target_type = dst_type;
    src_item->linked_item.target_item = 0;
    switch (dst_type)
    {
    case TEXT_OBJECT_TYPE:
        src_item->linked_item.target_object.text = dst_no;
        src_item->linked_item.target_item = ((Text_stat *)dst_ptr)->highest_aux + 1;
        break;
    case CONF_OBJECT_TYPE:
        src_item->linked_item.target_object.conf = dst_no;
        src_item->linked_item.target_item = ((Conference *)dst_ptr)->highest_aux + 1;
        break;
    case INFO_OBJECT_TYPE:
        src_item->linked_item.target_item = ((Info *)dst_ptr)->highest_aux_no + 1;
        src_item->linked_item.target_object.text = 0;
        src_item->linked_item.target_object.conf = 0;
        break;
    default:
        src_item->linked_item.target_item = 0;
        src_item->linked_item.target_object.text = 0;
        src_item->linked_item.target_object.conf = 0;
    }


    /* Set up an item list to add */

    item_list.length = 1;
    item_list.items = dst_item_data;
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    prepare_aux_item_list(&item_list, src_item->creator);
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    /*
     * Add the item and mark the destination as changed
     *
     * Note that these calls may cause the aux item list of the
     * destination to move in memory due to calls to realloc.
     */

    switch (dst_type)
    {
    case TEXT_OBJECT_TYPE:
        text_stat_add_aux_item_list((Text_stat *)dst_ptr,
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                                    (Text_no)dst_no, &item_list,
                                    src_item->creator);
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	/* FIXME (bug 141): is this necessary?  The call to
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	   mark_linked_object_as_changed below seems to fix this,
	   right?  --ceder 1999-07-10. */
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        mark_text_as_changed((Text_no)dst_no);
        break;
    case CONF_OBJECT_TYPE:
        conf_stat_add_aux_item_list((Conference *)dst_ptr,
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                                    (Conf_no)dst_no, &item_list,
                                    src_item->creator);
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	/* FIXME (bug 141): is this necessary?  The call to
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	   mark_linked_object_as_changed below seems to fix this,
	   right?  --ceder 1999-07-10. */
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        mark_conference_as_changed((Conf_no)dst_no);
        break;

    case INFO_OBJECT_TYPE:
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        system_add_aux_item_list((Info *)dst_ptr, &item_list,
                                 src_item->creator);
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        break;

    default:
        break;
    }

    /*
     * Set src_item to NULL since there is a chance that it is
     * no longer valid (this happens when the source and destination
     * objects are the same and reallocing the aux item list causes
     *  it to move in memory
     */
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    /* FIXME (bug 142): but src_item isn't used below this point!  What is the
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       point of setting it to NULL?  --ceder 1999-07-10.  */
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    src_item = NULL;

    /*
     * Mark the source object as changed
     */

    mark_linked_object_as_changed(dst_item_data);
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}

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static void
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aux_item_list_add_items(Aux_item_list *add_to_list,
                        Aux_item_list *items_to_add,
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                        enum object_type object_type,
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                        unsigned long  object_no,
                        void          *object_ptr,
                        unsigned long *highest_ptr,
                        Pers_no        item_creator)
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{
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    unsigned long       i;
    unsigned long       highest_local;
    unsigned long       start_index;
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    if (items_to_add == NULL)
        return;

    /*
     * Make local copies of variables we need in their original state
     */

    start_index = add_to_list->length;
    highest_local = *highest_ptr;

    /*
     * Set up the target list so it looks like we've added
     * items to it already. That way it is semi-safe to call
     * this function recursively.
     */

    add_to_list->items = srealloc(add_to_list->items,
                                  (add_to_list->length + items_to_add->length) *
                                  sizeof(Aux_item));
    add_to_list->length += items_to_add->length;
    *highest_ptr = *highest_ptr + items_to_add->length;

    for (i = 0; i < items_to_add->length; i++)
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    {
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        init_aux_item(&add_to_list->items[start_index + i]);
    }

    /*
     * Now add the items and call the add triggers
     */

    for (i = 0; i < items_to_add->length; i++)
    {
        highest_local += 1;
        copy_aux_item(&add_to_list->items[i + start_index],
                      &items_to_add->items[i]);
        add_to_list->items[i + start_index].aux_no  = highest_local;
        add_to_list->items[i + start_index].creator = item_creator;
        aux_item_call_add_triggers(
            find_aux_item_definition(&items_to_add->items[i]),
            object_type,
            i + start_index,
            object_no,
            object_ptr,
            &add_to_list->items[i + start_index]);
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    }
}
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/*
 * prepare_aux_item_list
 *
 * Prepare items in LIST for checking and addition. You *have*
 * to call this before any of the addition or checking
 * function. CREATOR is the person who wants to create the
 * item list. This function will set various fields in the
 * items. UTSL.
 */

void
prepare_aux_item_list(Aux_item_list *list,
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                      Pers_no creator)
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{
    unsigned long i;

    if (list == NULL)
        return;
    
    for (i = 0; i < list->length; i++)
    {
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        prepare_aux_item(&list->items[i], creator, NULL);
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    }
}

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static void
prepare_aux_item(Aux_item *item,
		 Pers_no creator,
		 const Aux_item_definition *def)
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{
    if (item == NULL)
        return;
    def = def ? def : find_aux_item_definition(item);
    if (def == NULL)
        return;

    AUX_ADJUST_FLAG(inherit);
    AUX_ADJUST_FLAG(secret);
    AUX_ADJUST_FLAG(hide_creator);
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    AUX_ADJUST_FLAG(dont_garb);
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    AUX_ADJUST_FLAG(reserved3);
    AUX_ADJUST_FLAG(reserved4);
    AUX_ADJUST_FLAG(reserved5);
    /* AUX_ADJUST_FLAG(deleted); */
    item->flags.deleted = 0;

    if (def->inherit_limit != 0 &&
        (item->inherit_limit > def->inherit_limit ||
         item->inherit_limit == 0))
        item->inherit_limit = def->inherit_limit;

    item->creator = creator;
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    item->sent_at = current_time;
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}



static Bool aux_item_validate(Aux_item_validation_data validation_data)
{
    unsigned long               i;
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    const Aux_item_definition        *def;
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    def = validation_data.def;
    for (i = 0; i < def->num_validators; i++)
    {
        switch (def->validators[i].type)
        {
        case AUX_VALIDATE_FUNCTION:
            /*
             * Call the validation function
             * If it returns false, then abort validation
             * If it returns true, then continue with the
             * next validator
             */

            if ((*def->validators[i].v.fn.function)(&validation_data) == FALSE)
            {
                return FALSE;
            }
            break;

        case AUX_VALIDATE_REGEXP:

            /*
             * Ensure that the regexp is cached
             */
            
            if (def->validators[i].v.re.cached_re_buf == NULL)
            {
                aux_item_definition_cache_regexp(def, i);
            }

            /*
             * If the RE is still not cached there is a problem
             * in this case to not validate the item at all and
             * log a problem
             */

            if (def->validators[i].v.re.cached_re_buf == NULL)
            {
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                kom_log("Failed to cache regexp validator for \"%s\". "
			"Rejecting all such items\n",
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                        def->name);
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                sfree(def->validators[i].v.re.regexp);
                def->validators[i].v.re.regexp = NULL;
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                def->validators[i].type = AUX_VALIDATE_REJECT;
                kom_errno = KOM_ILL_AUX;
                return FALSE;
            }

            /*
             * RE is compiled and can be used
             */

            switch (re_search(def->validators[i].v.re.cached_re_buf,
                              validation_data.item->data.string,
                              s_strlen(validation_data.item->data),
                              0,
                              s_strlen(validation_data.item->data),
                              NULL))
            {
            case -1:
                /* No match */
                kom_errno = KOM_ILL_AUX;
                return FALSE;
            case -2:
                /* Internal error may (be temporary) */
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                kom_log("Internal error in regex matching aux-item data.\n");
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                kom_errno = KOM_ILL_AUX;
                return FALSE;
                break;
            default:
                /* Matched */
                break;
            }
            

            break;

        case AUX_VALIDATE_REJECT:
            /*
             * Just reject the item. Used when we detect a problem
             * with a validator
             */

            kom_errno = KOM_ILL_AUX;
            return FALSE;
            break;

        default:
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            kom_log("BUG: unknown aux_item validator type\n");
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        }
    }

    /*
     * If we got all the way to here we passed all the validators
     */

    return TRUE;

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}

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/*
 * aux_item_add_perm
 *
 * Check if it is alright to add an aux_item.
 *
 * ITEM is the item that you want to add.
 * DEF is the item's definition or NULL.
 * ITEM_CREATOR is the person who wants to create the item.
 * OBJECT_CREATOR is the person who created the object to which
 *     the item might be added. For texts it is the author, for
 *     persons it is the person and for conferences it is the
 *     conference supervisor.
 * OWNER_CHECK is TRUE when this function is supposed to check author
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 *     and supervisor-related flags. The only case when this is to
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 *     be FALSE is when checking author or supervisor makes not sense,
 *     such as when creating a completely new conference.
 * ADD_TO_LIST is the item list to add to, or NULL.
 * START_LOOKING_AT is the first index in add_to_list to start
 *     looking at for possible duplicates.
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 * CREATING is true if we are checking while creating an object.
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 * OBJECT_TYPE is the type of the object the item is added to.
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 */

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static Bool
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aux_item_add_perm(const Aux_item *item,
                  const Aux_item_definition *def,
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                  Pers_no item_creator,
                  Pers_no object_creator,
                  Bool owner_check,
                  Aux_item_list *add_to_list,
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                  unsigned long start_looking_at,
                  Bool creating,
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                  enum object_type object_type
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                  )
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{
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    short can_add_when = 0;
    
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    kom_errno = KOM_NO_ERROR;

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    if (def == NULL)
	def = find_aux_item_definition(item);
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    /* Can't create an item with no definition */
      
    if (def == NULL)
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    {
        kom_errno = KOM_ILL_AUX;
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        return FALSE;
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    }
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    if (def->disabled)
    {
        kom_errno = KOM_ILL_AUX;
        return FALSE;
    }

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    switch (object_type)
    {
    case TEXT_OBJECT_TYPE: can_add_when = def->text_a; break;
    case CONF_OBJECT_TYPE: can_add_when = def->conf_a; break;
    default: can_add_when = 0;
    }

    if (can_add_when)
    {
        if (!((creating  && (can_add_when & AUX_ITEM_ADD_ON_CREATE)) ||
              (!creating && (can_add_when & AUX_ITEM_ADD_ON_MODIFY))))
        {
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            kom_errno = KOM_AUX_PERM;
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            return FALSE;
        }
    }

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    if (def->system_only &&
        owner_check)
    {
        kom_errno = KOM_AUX_PERM;
        return FALSE;
    }

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    /* FIXME (bug 334): is_strictly_supervisor() or is_supervisor()? */ 
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    /* FIXME (bug 334): the is_strictly_supervisor() call checks if
       item_creator is supervisor of object_creator.  The intention is
       to check if item_creator is supervisor of conference X, where
       X's supervisor is object_creator. */
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    if (def->author_only &&
        owner_check &&
        object_creator != item_creator &&
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        !is_strictly_supervisor(object_creator, item_creator, NULL) &&
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        !(item_creator == ACTPERS && ENA(wheel, 8))) /* NOT OK! */
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    {
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        kom_errno = KOM_AUX_PERM;
        return FALSE;
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    }

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    /* FIXME (bug 334): is_strictly_supervisor() or is_supervisor()? */ 
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    /* FIXME (bug 334): the is_strictly_supervisor() call checks if
       item_creator is supervisor of object_creator.  The intention is
       to check if item_creator is supervisor of conference X, where
       X's supervisor is object_creator. */
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    if (def->supervisor_only &&
         owner_check &&
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        !is_strictly_supervisor(object_creator, item_creator, NULL) &&
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        !(item_creator == ACTPERS && ENA(wheel,8))) /* NOT OK! */
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    {
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        kom_errno = KOM_AUX_PERM;
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        return FALSE;
    }

    /* Even the administrator can't override this */

    if (!aux_item_check_unique(item, def, add_to_list, start_looking_at))
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    {
        kom_errno = KOM_AUX_PERM;
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        return FALSE;
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    }
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    /* Check the contents */

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    if (def->num_validators > 0)
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    {
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        Aux_item_validation_data validation_data;

        validation_data.item = item;
        validation_data.def = def;
        validation_data.item_creator = item_creator;
        validation_data.object_creator = object_creator;
        validation_data.owner_check = owner_check;
        validation_data.add_to_list = add_to_list;
        validation_data.start_looking_at = start_looking_at;
        validation_data.creating = creating;
        validation_data.object_type = object_type;

        if (aux_item_validate(validation_data) != TRUE)
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        {
            kom_errno = KOM_ILL_AUX;
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            return FALSE;
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        }
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    }

    return TRUE;
}


/*
 * aux_item_check_unique
 *
 * Check whether there are items that block creation of a new item.
 * ITEM is the item we want to add.
 * DEF is the item's definitioon
 * ADD_TO_LIST is the list we want to add to
 * START_LOOKING_AT is the first index in the list to look at.
 */

static Bool
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aux_item_check_unique(const Aux_item *item,
                      const Aux_item_definition *def,
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                      Aux_item_list *add_to_list,
                      unsigned long start_looking_at)
{
    unsigned long i;

    if (add_to_list == NULL ||
        item == NULL ||
        start_looking_at >= add_to_list->length)
        return TRUE;

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    if (def != NULL)
	def = find_aux_item_definition(item);
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    if (def == NULL || !def->one_per_person)
        return TRUE;

    for (i = start_looking_at; i < add_to_list->length; i++)
    {
        if (add_to_list->items[i].tag == item->tag &&
            add_to_list->items[i].creator == item->creator &&
            !add_to_list->items[i].flags.deleted)
            return FALSE;
    }

    return TRUE;
}


/*
 * aux_inherit_items
 *
 * Inherit aux items from PARENT to TARGET. COUNTER is a pointer
 * to the aux_no counter in the object being inherited to and CREATOR
 * is the author or equivalent of the target object.
 */

void
aux_inherit_items(Aux_item_list *target,
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                  const Aux_item_list *parent,
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                  unsigned long *counter,
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                  Pers_no target_creator,
                  Bool creating,
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                  enum object_type object_type,
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                  unsigned long object_no,
                  void *object)
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{
    int i;
    Aux_item item;
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    const Aux_item_definition *def;
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    /* Inheriting linked items is strange, but works. */
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