/*------------------------------------------------------------------------------
*
* Copyright (c) 2011, EURid. All rights reserved.
* The YADIFA TM software product is provided under the BSD 3-clause license:
* 
* Redistribution and use in source and binary forms, with or without 
* modification, are permitted provided that the following conditions
* are met:
*
*        * Redistributions of source code must retain the above copyright 
*          notice, this list of conditions and the following disclaimer.
*        * 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.
*        * Neither the name of EURid nor the names of its contributors may be 
*          used to endorse or promote products derived from this software 
*          without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT HOLDER OR 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.
*
*------------------------------------------------------------------------------
*
*/
/** @defgroup config Configuration handling
 *  @ingroup yadifad
 *  @brief
 *
 * @{
 */

#include <stdio.h>
#include <stdlib.h>

#include "config.h"

#include <dnscore/format.h>
#include <dnscore/config_settings.h>
#include <dnscore/base16.h>
#include <dnscore/nsid.h>

#include "server-config.h"

extern logger_handle *g_server_logger;
#define MODULE_MSG_HANDLE g_server_logger

#if HAS_NSID_SUPPORT

struct byte_array_s
{
    u8 *bytes;
    u32 size;
};

struct config_nsid_s
{
    struct byte_array_s nsid;
};

typedef struct config_nsid_s config_nsid_s;


static ya_result
config_set_byte_array(struct byte_array_s *dest, const u8 *bytes, u32 size)
{
    if(dest->bytes != NULL)
    {
        log_warn("config: NSID has already been set, previous value overwritten");
        
        if(dest->size != size)
        {
            free(dest->bytes);
            dest->bytes = NULL;
            dest->size = 0;
        }
        else // equal sizes
        {
            if(memcmp(dest->bytes, bytes, size) != 0)
            {
                memcpy(dest->bytes, bytes, size);
            }
            
            return SUCCESS;
        }
    }

    MALLOC_OR_DIE(u8*, dest->bytes, size, GENERIC_TAG);
    memcpy(dest->bytes, bytes, size);
    dest->size = size;
    
    return SUCCESS;
}
        
ya_result
config_set_byte_array_from_ascii(const char *value, struct byte_array_s *dest, anytype settings)
{
    ya_result return_code;
 
    return_code = config_set_byte_array(dest, (const u8*)value, strlen(value));
    
    return return_code;
}

ya_result
config_set_byte_array_from_hex(const char *value, struct byte_array_s *dest, anytype settings)
{
    ya_result return_code;
    
    u32 value_len = strlen(value);
    
    u8 tmp[EDNS0_NSID_SIZE_MAX];
    
    if(value_len > EDNS0_NSID_SIZE_MAX * 2)
    {
        return ERROR;
    }
    
    return_code = base16_decode(value, value_len, tmp);
    
    if(ISOK(return_code))
    {    
        return_code = config_set_byte_array(dest, tmp, return_code);
    }
    
    return return_code;
}

#define CONFIG_TYPE config_nsid_s

CONFIG_BEGIN(config_nsid_desc)
{"ascii", offsetof(CONFIG_TYPE, nsid), (config_set_field_function*)config_set_byte_array_from_ascii, NULL,{._intptr=0}, CONFIG_TABLE_SOURCE_NONE}, \
{"hex", offsetof(CONFIG_TYPE, nsid), (config_set_field_function*)config_set_byte_array_from_hex, NULL,{._intptr=0}, CONFIG_TABLE_SOURCE_NONE},
//{"hostname", offsetof(CONFIG_TYPE, fieldname), (config_set_field_function*)config_set_search_or_domain, NULL,{._u8=RO_DOMAIN}, CONFIG_TABLE_SOURCE_NONE},
CONFIG_END(config_nsid_desc)
#undef CONFIG_TYPE

static config_nsid_s tmp_config_nsid = {{NULL, 0}};

static ya_result
config_nsid_section_postprocess(struct config_section_descriptor_s *csd)
{
    /* here check that the settings are right */
    
    edns0_set_nsid(tmp_config_nsid.nsid.bytes, tmp_config_nsid.nsid.size);
    
    return SUCCESS;
}

ya_result
config_register_nsid(s32 priority)
{
    const char *section_name = "nsid";
    
    ya_result return_code = config_register_struct(section_name, config_nsid_desc, &tmp_config_nsid, priority);
    
    if(ISOK(return_code))
    {    
        // hook a new finaliser before the standard one
        
        config_section_descriptor_s *section_desc = config_section_get_descriptor(section_name);
        config_section_descriptor_vtbl_s *vtbl = (config_section_descriptor_vtbl_s *)section_desc->vtbl;
        vtbl->postprocess = config_nsid_section_postprocess;
    }
    
    return return_code;
}

#endif

/** @} */
