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/*

 * Copyright (c) 2009 Lukas Mejdrech

 * All rights reserved.

 *

 * 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.

 */

/** @addtogroup arp

 *  @{

 */

/** @file

 *  ARP module implementation.

 *  @see arp.h

 */

#include <async.h>

#include <malloc.h>

#include <mem.h>

#include <rwlock.h>

#include <stdio.h>

#include <string.h>

#include <task.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include "../../err.h"

#include "../../messages.h"

#include "../../modules.h"

#include "../../include/byteorder.h"

#include "../../include/device.h"

#include "../../include/arp_interface.h"

#include "../../include/nil_interface.h"

#include "../../include/protocol_map.h"

#include "../../structures/measured_strings.h"

#include "../../structures/packet/packet.h"

#include "../../structures/packet/packet_client.h"

#include "../il_messages.h"

#include "arp.h"

#include "arp_header.h"

#include "arp_oc.h"

#include "arp_module.h"

#include "arp_messages.h"

/** ARP global data.

 */

arp_globals_t   arp_globals;

/** Creates new protocol specific data.

 *  @param proto Protocol specific data. Output parameter.

 *  @param service Protocol module service. Input parameter.

 *  @param address Actual protocol device address. Input parameter.

 *  @returns EOK on success.

 *  @returns ENOMEM if there is not enough memory left.

 */

int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address );

/** Registers the device.

 *  Creates new device entry in the cache or updates the protocol address if the device with the device identifier and the driver service exists.

 *  @param device_id The device identifier. Input parameter.

 *  @param service The device driver service. Input parameter.

 *  @param protocol The protocol service. Input parameter.

 *  @param address The actual device protocol address.

 *  @returns EOK on success.

 *  @returns EEXIST if another device with the same device identifier and different driver service exists.

 *  @returns ENOMEM if there is not enough memory left.

 *  @returns Other error codes as defined for the measured_strings_return() function.

 */

int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address );

/** Returns the hardware address for the given protocol address.

 *  Sends the ARP request packet if the hardware address is not found in the cache.

 *  @param device_id The device identifier. Input parameter.

 *  @param protocol The protocol service. Input parameter.

 *  @param target The target protocol address. Input parameter.

 *  @returns The hardware address of the target.

 *  @returns NULL if the target parameter is NULL.

 *  @returns NULL if the device is not found.

 *  @returns NULL if the device packet is too small to send a request.

 *  @returns NULL if the hardware address is not found in the cache.

 */

measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target );

/** Processes the received ARP packet.

 *  Updates the source hardware address if the source entry exists or the packet is targeted to my protocol address.

 *  Responses to the ARP request if the packet is the ARP request and is targeted to my address.

 *  @param device_id The source device identifier. Input parameter.

 *  @param packet The received packet. Input/output parameter.

 *  @returns EOK on success and the packet is no longer needed.

 *  @returns 1 on success and the packet has been reused.

 *  @returns EINVAL if the packet is too small to carry the ARP packet.

 *  @returns EINVAL if the received address lengths differs from the registered values.

 *  @returns ENOENT if the device is not found in the cache.

 *  @returns ENOENT if the protocol for the device is not found in the cache.

 *  @returns ENOMEM if there is not enough memory left.

 */

int arp_receive_message( device_id_t device_id, packet_t packet );

/** Clears the device specific data.

 *  @param device The device specific data.

 */

void    clear_device( arp_device_ref device );

DEVICE_MAP_IMPLEMENT( arp_cache, arp_device_t )

INT_MAP_IMPLEMENT( arp_protos, arp_proto_t )

GENERIC_CHAR_MAP_IMPLEMENT( arp_addr, measured_string_t )

task_id_t arp_task_get_id( void ){

    return task_get_id();

}

int arp_clear_device_req( int arp_phone, device_id_t device_id ){

    arp_device_ref  device;

    rwlock_write_lock( & arp_globals.lock );

    device = arp_cache_find( & arp_globals.cache, device_id );

    if( ! device ){

        rwlock_write_unlock( & arp_globals.lock );

        return ENOENT;

    }

    clear_device( device );

    printf( "Device %d cleared\n", device_id );

    rwlock_write_unlock( & arp_globals.lock );

    return EOK;

}

int arp_clean_cache_req( int arp_phone ){

    int             count;

    arp_device_ref  device;

    rwlock_write_lock( & arp_globals.lock );

    for( count = arp_cache_count( & arp_globals.cache ) - 1; count >= 0; -- count ){

        device = arp_cache_get_index( & arp_globals.cache, count );

        if( device ){

            clear_device( device );

            if( device->addr_data ) free( device->addr_data );

            if( device->broadcast_data ) free( device->broadcast_data );

        }

    }

    arp_cache_clear( & arp_globals.cache );

    rwlock_write_unlock( & arp_globals.lock );

    printf( "Cache cleaned\n" );

    return EOK;

}

int arp_device_req( int arp_phone, device_id_t device_id, services_t protocol, services_t netif, measured_string_ref address ){

    ERROR_DECLARE;

    measured_string_ref tmp;

    tmp = measured_string_copy( address );

    if( ERROR_OCCURRED( arp_device_message( device_id, netif, protocol, tmp ))){

        free( tmp->value );

        free( tmp );

    }

    return ERROR_CODE;

}

int arp_translate_req( int arp_phone, device_id_t device_id, services_t protocol, measured_string_ref address, measured_string_ref * translation, char ** data ){

    measured_string_ref tmp;

    rwlock_read_lock( & arp_globals.lock );

    tmp = arp_translate_message( device_id, protocol, address );

    if( tmp ){

        * translation = measured_string_copy( tmp );

        rwlock_read_unlock( & arp_globals.lock );

        if( * translation ){

            * data = ( ** translation ).value;

            return EOK;

        }else{

            return ENOMEM;

        }

    }else{

        rwlock_read_unlock( & arp_globals.lock );

        return ENOENT;

    }

}

int arp_initialize( async_client_conn_t client_connection ){

    ERROR_DECLARE;

    rwlock_initialize( & arp_globals.lock );

    rwlock_write_lock( & arp_globals.lock );

    arp_globals.client_connection = client_connection;

    ERROR_PROPAGATE( arp_cache_initialize( & arp_globals.cache ));

    rwlock_write_unlock( & arp_globals.lock );

    return EOK;

}

int arp_proto_create( arp_proto_ref * proto, services_t service, measured_string_ref address ){

    ERROR_DECLARE;

    * proto = ( arp_proto_ref ) malloc( sizeof( arp_proto_t ));

    if( !( * proto )) return ENOMEM;

    ( ** proto ).service = service;

    ( ** proto ).addr = address;

    ( ** proto ).addr_data = address->value;

    if( ERROR_OCCURRED( arp_addr_initialize( &( ** proto).addresses ))){

        free( * proto );

        return ERROR_CODE;

    }

    return EOK;

}

int arp_device_message( device_id_t device_id, services_t service, services_t protocol, measured_string_ref address ){

    ERROR_DECLARE;

    arp_device_ref  device;

    arp_proto_ref   proto;

    int             index;

    hw_type_t       hardware;

    rwlock_write_lock( & arp_globals.lock );

    // an existing device?

    device = arp_cache_find( & arp_globals.cache, device_id );

    if( device ){

        if( device->service != service ){

            printf( "Device %d already exists\n", device->device_id );

            rwlock_write_unlock( & arp_globals.lock );

            return EEXIST;

        }

        proto = arp_protos_find( & device->protos, protocol );

        if( proto ){

            free( proto->addr );

            free( proto->addr_data );

            proto->addr = address;

            proto->addr_data = address->value;

        }else{

            if( ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){

                rwlock_write_unlock( & arp_globals.lock );

                return ERROR_CODE;

            }

            index = arp_protos_add( & device->protos, proto->service, proto );

            if( index < 0 ){

                rwlock_write_unlock( & arp_globals.lock );

                free( proto );

                return index;

            }

            printf( "New protocol added:\n\tdevice id\t= %d\n\tproto\t= %d", device_id, protocol );

        }

    }else{

        hardware = hardware_map( service );

        if( ! hardware ) return ENOENT;

        // create a new device

        device = ( arp_device_ref ) malloc( sizeof( arp_device_t ));

        if( ! device ){

            rwlock_write_unlock( & arp_globals.lock );

            return ENOMEM;

        }

        device->hardware = hardware;

        device->device_id = device_id;

        if( ERROR_OCCURRED( arp_protos_initialize( & device->protos ))

        || ERROR_OCCURRED( arp_proto_create( & proto, protocol, address ))){

            rwlock_write_unlock( & arp_globals.lock );

            free( device );

            return ERROR_CODE;

        }

        index = arp_protos_add( & device->protos, proto->service, proto );

        if( index < 0 ){

            rwlock_write_unlock( & arp_globals.lock );

            arp_protos_destroy( & device->protos );

            free( device );

            return index;

        }

        device->service = service;

        // bind the new one

        device->phone = bind_service( device->service, ( ipcarg_t ) device->device_id, SERVICE_ARP, 0, arp_globals.client_connection );

        if( device->phone < 0 ){

            rwlock_write_unlock( & arp_globals.lock );

            arp_protos_destroy( & device->protos );

            free( device );

            return EREFUSED;

        }

        // get packet dimensions

        if( ERROR_OCCURRED( nil_packet_size_req( device->phone, device_id, & device->addr_len, & device->prefix, & device->content, & device->suffix ))){

            rwlock_write_unlock( & arp_globals.lock );

            arp_protos_destroy( & device->protos );

            free( device );

            return ERROR_CODE;

        }

        // get hardware address

        if( ERROR_OCCURRED( nil_get_addr( device->phone, device_id, & device->addr, & device->addr_data ))){

            rwlock_write_unlock( & arp_globals.lock );

            arp_protos_destroy( & device->protos );

            free( device );

            return ERROR_CODE;

        }

        // get broadcast address

        if( ERROR_OCCURRED( nil_get_broadcast_addr( device->phone, device_id, & device->broadcast_addr, & device->broadcast_data ))){

            rwlock_write_unlock( & arp_globals.lock );

            free( device->addr );

            free( device->addr_data );

            arp_protos_destroy( & device->protos );

            free( device );

            return ERROR_CODE;

        }

        if( ERROR_OCCURRED( arp_cache_add( & arp_globals.cache, device->device_id, device ))){

            rwlock_write_unlock( & arp_globals.lock );

            free( device->addr );

            free( device->addr_data );

            free( device->broadcast_addr );

            free( device->broadcast_data );

            arp_protos_destroy( & device->protos );

            free( device );

            return ERROR_CODE;

        }

        printf( "New device registered:\n\tid\t= %d\n\ttype\t= 0x%x\n\tservice\t= %d\n\tproto\t= %d\n", device->device_id, device->hardware, device->service, protocol );

    }

    rwlock_write_unlock( & arp_globals.lock );

    return EOK;

}

measured_string_ref arp_translate_message( device_id_t device_id, services_t protocol, measured_string_ref target ){

    arp_device_ref      device;

    arp_proto_ref       proto;

    measured_string_ref addr;

    size_t              length;

    packet_t            packet;

    arp_header_ref      header;

    if( ! target ) return NULL;

    device = arp_cache_find( & arp_globals.cache, device_id );

    if( ! device ) return NULL;

    proto = arp_protos_find( & device->protos, protocol );

    if(( ! proto ) || ( proto->addr->length != target->length )) return NULL;

    addr = arp_addr_find( & proto->addresses, target->value, target->length );

    if( addr ) return addr;

    // ARP packet content size = header + ( address + translation ) * 2

    length = 8 + ( CONVERT_SIZE( char, uint8_t, proto->addr->length ) + CONVERT_SIZE( char, uint8_t, device->addr->length )) * 2;

    if( length > device->content ) return NULL;

    packet = packet_get_4( arp_globals.net_phone, device->addr_len, device->prefix, length, device->suffix );

    if( ! packet ) return NULL;

    header = ( arp_header_ref ) packet_suffix( packet, length );

    if( ! header ){

        pq_release( arp_globals.net_phone, packet_get_id( packet ));

        return NULL;

    }

    header->hardware = htons( device->hardware );

    header->hardware_length = ( uint8_t ) device->addr->length;

    header->protocol = htons( protocol_map( device->service, protocol ));

    header->protocol_length = ( uint8_t ) proto->addr->length;

    header->operation = htons( ARPOP_REQUEST );

    length = sizeof( arp_header_t );

    memcpy((( uint8_t * ) header ) + length, device->addr->value, device->addr->length );

    length += device->addr->length;

    memcpy((( uint8_t * ) header ) + length, proto->addr->value, proto->addr->length );

    length += proto->addr->length;

    bzero((( uint8_t * ) header ) + length, device->addr->length );

    length += device->addr->length;

    memcpy((( uint8_t * ) header ) + length, target->value, target->length );

    if( packet_set_addr( packet, ( uint8_t * ) device->addr->value, ( uint8_t * ) device->broadcast_addr->value, CONVERT_SIZE( char, uint8_t, device->addr->length )) != EOK ){

        pq_release( arp_globals.net_phone, packet_get_id( packet ));

        return NULL;

    }

    nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );

    return NULL;

}

int arp_receive_message( device_id_t device_id, packet_t packet ){

    ERROR_DECLARE;

    size_t              length;

    arp_header_ref      header;

    arp_device_ref      device;

    arp_proto_ref       proto;

    measured_string_ref hw_source;

    uint8_t *           src_hw;

    uint8_t *           src_proto;

    uint8_t *           des_hw;

    uint8_t *           des_proto;

    length = packet_get_data_length( packet );

    if( length <= sizeof( arp_header_t )) return EINVAL;

    device = arp_cache_find( & arp_globals.cache, device_id );

    if( ! device ) return ENOENT;

    header = ( arp_header_ref ) packet_get_data( packet );

    if(( ntohs( header->hardware ) != device->hardware )

    // TODO how remove conversion from int '2' to uint?

    || ( length < sizeof( arp_header_t ) + ( header->hardware_length + header->protocol_length ) * 2u )){

        return EINVAL;

    }

    proto = arp_protos_find( & device->protos, protocol_unmap( device->service, ntohs( header->protocol )));

    if( ! proto ) return ENOENT;

    src_hw = (( uint8_t * ) header ) + sizeof( arp_header_t );

    src_proto = src_hw + header->hardware_length;

    des_hw = src_proto + header->protocol_length;

    des_proto = des_hw + header->hardware_length;

    hw_source = arp_addr_find( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ));

    // exists?

    if( hw_source ){

        if( hw_source->length != CONVERT_SIZE( uint8_t, char, header->hardware_length )){

            return EINVAL;

        }

        memcpy( hw_source->value, src_hw, hw_source->length );

    }

    // is my protocol address?

    if( proto->addr->length != CONVERT_SIZE( uint8_t, char, header->protocol_length )){

        return EINVAL;

    }

    if( ! str_lcmp( proto->addr->value, ( char * ) des_proto, proto->addr->length )){

        // not already upadted?

        if( ! hw_source ){

            hw_source = measured_string_create_bulk(( char * ) src_hw, CONVERT_SIZE( uint8_t, char, header->hardware_length ));

            if( ! hw_source ) return ENOMEM;

            ERROR_PROPAGATE( arp_addr_add( & proto->addresses, ( char * ) src_proto, CONVERT_SIZE( uint8_t, char, header->protocol_length ), hw_source ));

        }

        if( ntohs( header->operation ) == ARPOP_REQUEST ){

            header->operation = htons( ARPOP_REPLY );

            memcpy( des_proto, src_proto, header->protocol_length );

            memcpy( src_proto, proto->addr->value, header->protocol_length );

            memcpy( src_hw, device->addr->value, device->addr_len );

            memcpy( des_hw, hw_source->value, header->hardware_length );

            ERROR_PROPAGATE( packet_set_addr( packet, src_hw, des_hw, header->hardware_length ));

            nil_send_msg( device->phone, device_id, packet, SERVICE_ARP );

            return 1;

        }

    }

    return EOK;

}

void clear_device( arp_device_ref device ){

    int             count;

    arp_proto_ref   proto;

    for( count = arp_protos_count( & device->protos ) - 1; count >= 0; -- count ){

        proto = arp_protos_get_index( & device->protos, count );

        if( proto ){

            if( proto->addr ) free( proto->addr );

            if( proto->addr_data ) free( proto->addr_data );

            arp_addr_destroy( & proto->addresses );

        }

    }

    arp_protos_clear( & device->protos );

}

int arp_connect_module( services_t service ){

    return EOK;

}

int arp_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){

    ERROR_DECLARE;

    measured_string_ref address;

    measured_string_ref translation;

    char *              data;

    packet_t            packet;

    packet_t            next;

//  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_ARP_FIRST );

    * answer_count = 0;

    switch( IPC_GET_METHOD( * call )){

        case IPC_M_PHONE_HUNGUP:

            return EOK;

        case NET_ARP_DEVICE:

            ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));

            if( ERROR_OCCURRED( arp_device_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), ARP_GET_NETIF( call ), address ))){

                free( address );

                free( data );

            }

            return ERROR_CODE;

        case NET_ARP_TRANSLATE:

            ERROR_PROPAGATE( measured_strings_receive( & address, & data, 1 ));

            rwlock_read_lock( & arp_globals.lock );

            translation = arp_translate_message( IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ), address );

            free( address );

            free( data );

            if( ! translation ){

                rwlock_read_unlock( & arp_globals.lock );

                return ENOENT;

            }

            ERROR_CODE = measured_strings_reply( translation, 1 );

            rwlock_read_unlock( & arp_globals.lock );

            return ERROR_CODE;

        case NET_ARP_CLEAR_DEVICE:

            return arp_clear_device_req( 0, IPC_GET_DEVICE( call ));

        case NET_ARP_CLEAN_CACHE:

            return arp_clean_cache_req( 0 );

        case NET_IL_DEVICE_STATE:

            // do nothing - keep the cache

            return EOK;

        case NET_IL_RECEIVED:

            if( ! ERROR_OCCURRED( packet_translate( arp_globals.net_phone, & packet, IPC_GET_PACKET( call )))){

                rwlock_read_lock( & arp_globals.lock );

                do{

                    next = pq_detach( packet );

                    ERROR_CODE = arp_receive_message( IPC_GET_DEVICE( call ), packet );

                    if( ERROR_CODE != 1 ) pq_release( arp_globals.net_phone, packet_get_id( packet ));

                    packet = next;

                }while( packet );

                rwlock_read_unlock( & arp_globals.lock );

            }

            return ERROR_CODE;

    }

    return ENOTSUP;

}

/** @}

 */