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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 net

 *  @{

 */

/** @file

 *  Networking subsystem central module implementation.

 */

#include <async.h>

#include <ctype.h>

#include <ddi.h>

#include <errno.h>

#include <malloc.h>

#include <stdio.h>

#include <string.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include "../err.h"

#include "../messages.h"

#include "../modules.h"

#include "../structures/char_map.h"

#include "../structures/generic_char_map.h"

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

#include "../structures/module_map.h"

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

#include "../il/il_messages.h"

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

#include "../include/netif_interface.h"

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

#include "../include/net_interface.h"

#include "../include/ip_interface.h"

#include "net.h"

/** Networking module name.

 */

#define NAME    "Networking"

/** Prints the module name.

 *  @see NAME

 */

void    module_print_name( void );

/** Starts the networking module.

 *  Initializes the client connection serving function, initializes the module, registers the module service and starts the async manager, processing IPC messages in an infinite loop.

 *  @param client_connection The client connection processing function. The module skeleton propagates its own one. Input parameter.

 *  @returns EOK on successful module termination.

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

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

 */

int module_start( async_client_conn_t client_connection );

//int       parse_line( measured_strings_ref configuration, char * line );

/** Reads the networking subsystem global configuration.

 *  @returns EOK on success.

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

 */

int     read_configuration( void );

/** Starts the network interface according to its configuration.

 *  Registers the network interface with the subsystem modules.

 *  Starts the needed subsystem modules.

 *  @param netif The network interface specific data.

 *  @returns EOK on success.

 *  @returns EINVAL if there are some settings missing.

 *  @returns ENOENT if the internet protocol module is not known.

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

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

 *  @returns Other error codes as defined for the needed internet layer registering function.

 */

int     start_device( netif_ref netif );

/** Reads the configuration and starts all network interfaces.

 *  @returns EOK on success.

 *  @returns EXDEV if there is no available system-unique device identifier.

 *  @returns EINVAL if any of the network interface names are not configured.

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

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

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

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

 */

int     startup( void );

/** Generates new system-unique device identifier.

 *  @returns The system-unique devic identifier.

 */

device_id_t generate_new_device_id( void );

/** Returns the configured values.

 *  The network interface configuration is searched first.

 *  @param netif_conf The network interface configuration setting. Input parameter.

 *  @param configuration The found configured values. Output parameter.

 *  @param count The desired settings count. Input parameter.

 *  @param data The found configuration settings data. Output parameter.

 *  @returns EOK.

 */

int net_get_conf( measured_strings_ref netif_conf, measured_string_ref configuration, size_t count, char ** data );

/** Networking module global data.

 */

net_globals_t   net_globals;

DEVICE_MAP_IMPLEMENT( netifs, netif_t )

GENERIC_CHAR_MAP_IMPLEMENT( measured_strings, measured_string_t )

void module_print_name( void ){

    printf( "%s", NAME );

}

int module_start( async_client_conn_t client_connection ){

    ERROR_DECLARE;

    ipcarg_t    phonehash;

    async_set_client_connection( client_connection );

    ERROR_PROPAGATE( pm_init());

    if( ERROR_OCCURRED( net_initialize( client_connection ))

    || ERROR_OCCURRED( REGISTER_ME( SERVICE_NETWORKING, & phonehash ))){

        pm_destroy();

        return ERROR_CODE;

    }

    async_manager();

    pm_destroy();

    return EOK;

}

int net_get_device_conf_req( int net_phone, device_id_t device_id, measured_string_ref * configuration, size_t count, char ** data ){

    netif_ref   netif;

    if( !( configuration && ( count > 0 ))) return EINVAL;

    netif = netifs_find( & net_globals.netifs, device_id );

    if( netif ){

        return net_get_conf( & netif->configuration, * configuration, count, data );

    }else{

        return net_get_conf( NULL, * configuration, count, data );

    }

}

int net_get_conf_req( int net_phone, measured_string_ref * configuration, size_t count, char ** data ){

    if( !( configuration && ( count > 0 ))) return EINVAL;

    return net_get_conf( NULL, * configuration, count, data );

}

int net_get_conf( measured_strings_ref netif_conf, measured_string_ref configuration, size_t count, char ** data ){

    measured_string_ref setting;

    size_t              index;

    if( data ) * data = NULL;

    for( index = 0; index < count; ++ index ){

        setting = measured_strings_find( netif_conf, configuration[ index ].value, 0 );

        if( ! setting ){

            setting = measured_strings_find( & net_globals.configuration, configuration[ index ].value, 0 );

        }

        if( setting ){

            configuration[ index ].length = setting->length;

            configuration[ index ].value = setting->value;

        }else{

            configuration[ index ].length = 0;

            configuration[ index ].value = NULL;

        }

    }

    return EOK;

}

void net_free_settings( measured_string_ref settings, char * data ){

}

int net_connect_module( services_t service ){

    return EOK;

}

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

    ERROR_DECLARE;

    measured_string_ref strings;

    char *              data;

    * answer_count = 0;

    switch( IPC_GET_METHOD( * call )){

        case IPC_M_PHONE_HUNGUP:

            return EOK;

        case NET_NET_DEVICE:

            // TODO configure, register

            printf( "Networking: new netif %d\n", IPC_GET_DEVICE( call ));

            return EOK;

        case NET_NET_GET_DEVICE_CONF:

            ERROR_PROPAGATE( measured_strings_receive( & strings, & data, IPC_GET_COUNT( call )));

            net_get_device_conf_req( 0, IPC_GET_DEVICE( call ), & strings, IPC_GET_COUNT( call ), NULL );

            // strings should not contain received data anymore

            free( data );

            ERROR_CODE = measured_strings_reply( strings, IPC_GET_COUNT( call ));

            free( strings );

            return ERROR_CODE;

        case NET_NET_GET_CONF:

            ERROR_PROPAGATE( measured_strings_receive( & strings, & data, IPC_GET_COUNT( call )));

            net_get_conf_req( 0, & strings, IPC_GET_COUNT( call ), NULL );

            // strings should not contain received data anymore

            free( data );

            ERROR_CODE = measured_strings_reply( strings, IPC_GET_COUNT( call ));

            free( strings );

            return ERROR_CODE;

        case NET_NET_STARTUP:

            return startup();

    }

    return ENOTSUP;

}

/*

int parse_line( measured_strings_ref configuration, char * line ){

    ERROR_DECLARE;

    measured_string_ref setting;

    char *          name;

    char *          value;

    // from the beginning

    name = line;

    // skip spaces

    while( isspace( * name )) ++ name;

    // remember the name start

    value = name;

    // skip the name

    while( isalnum( * value ) || ( * value == '_' )){

        // make uppercase

//      * value = toupper( * value );

        ++ value;

    }

    if( * value == '=' ){

        // terminate the name

        * value = '\0';

    }else{

        // terminate the name

        * value = '\0';

        // skip until '='

        ++ value;

        while(( * value ) && ( * value != '=' )) ++ value;

        // not found?

        if( * value != '=' ) return EINVAL;

    }

    ++ value;

    // skip spaces

    while( isspace( * value )) ++ value;

    // create a bulk measured string till the end

    setting = measured_string_create_bulk( value, -1 );

    if( ! setting ) return ENOMEM;

    // add the configuration setting

    if( ERROR_OCCURRED( measured_strings_add( configuration, name, 0, setting ))){

        free( setting );

        return ERROR_CODE;

    }

    return EOK;

}

*/

int add_configuration( measured_strings_ref configuration, const char * name, const char * value ){

    ERROR_DECLARE;

    measured_string_ref setting;

    setting = measured_string_create_bulk( value, 0 );

    if( ! setting ) return ENOMEM;

    // add the configuration setting

    if( ERROR_OCCURRED( measured_strings_add( configuration, name, 0, setting ))){

        free( setting );

        return ERROR_CODE;

    }

    return EOK;

}

device_id_t generate_new_device_id( void ){

    return device_assign_devno();

}

int read_configuration( void ){

    ERROR_DECLARE;

    // read general configuration

    ERROR_PROPAGATE( add_configuration( & net_globals.configuration, "IPV", "4" ));

    ERROR_PROPAGATE( add_configuration( & net_globals.configuration, "MTU", "1500" ));

    return EOK;

}

int start_device( netif_ref netif ){

    ERROR_DECLARE;

    measured_string_ref setting;

    services_t          internet_service;

    int                 irq;

    int                 io;

    int                 mtu;

    // mandatory netif

    setting = measured_strings_find( & netif->configuration, CONF_NETIF, 0 );

    netif->driver = get_running_module( & net_globals.modules, setting->value );

    if( ! netif->driver ){

        printf( "Failed to start the network interface driver %s\n", setting->value );

        return EINVAL;

    }

    // optional network interface layer

    setting = measured_strings_find( & netif->configuration, CONF_NIL, 0 );

    if( setting ){

        netif->nil = get_running_module( & net_globals.modules, setting->value );

        if( ! netif->nil ){

            printf( "Failed to start the network interface layer %s\n", setting->value );

            return EINVAL;

        }

    }else{

        netif->nil = NULL;

    }

    // mandatory internet layer

    setting = measured_strings_find( & netif->configuration, CONF_IL, 0 );

    netif->il = get_running_module( & net_globals.modules, setting->value );

    if( ! netif->il ){

        printf( "Failed to start the internet layer %s\n", setting->value );

        return EINVAL;

    }

    // end of the static loopback initialization

    // startup the loopback interface

    setting = measured_strings_find( & netif->configuration, CONF_IRQ, 0 );

    irq = setting ? strtol( setting->value, NULL, 10 ) : 0;

    setting = measured_strings_find( & netif->configuration, CONF_IO, 0 );

    io = setting ? strtol( setting->value, NULL, 16 ) : 0;

    ERROR_PROPAGATE( netif_probe_req( netif->driver->phone, netif->id, irq, io ));

    if( netif->nil ){

        setting = measured_strings_find( & netif->configuration, CONF_MTU, 0 );

        if( ! setting ){

            setting = measured_strings_find( & net_globals.configuration, CONF_MTU, 0 );

        }

        mtu = setting ? strtol( setting->value, NULL, 10 ) : 0;

        ERROR_PROPAGATE( nil_device_req( netif->nil->phone, netif->id, mtu, netif->driver->service ));

        internet_service = netif->nil->service;

    }else{

        internet_service = netif->driver->service;

    }

    switch( netif->il->service ){

        case SERVICE_IP:

            ERROR_PROPAGATE( ip_device_req( netif->il->phone, netif->id, internet_service ));

            break;

        default:

            return ENOENT;

    }

    ERROR_PROPAGATE( netif_start_req( netif->driver->phone, netif->id ));

    return EOK;

}

int startup( void ){

    ERROR_DECLARE;

    char *      conf_files[] = { "lo", "ne2k" };

    int         count = sizeof( conf_files ) / sizeof( char * );

    int         index;

    netif_ref   netif;

    int         i;

    measured_string_ref setting;

    // TODO dynamic configuration

    ERROR_PROPAGATE( read_configuration());

    for( i = 0; i < count; ++ i ){

        netif = ( netif_ref ) malloc( sizeof( netif_t ));

        if( ! netif ) return ENOMEM;

        netif->id = generate_new_device_id();

        if( ! netif->id ) return EXDEV;

        ERROR_PROPAGATE( measured_strings_initialize( & netif->configuration ));

        // read configuration files

        if( ERROR_OCCURRED( read_netif_configuration( conf_files[ i ], netif ))){

            measured_strings_destroy( & netif->configuration );

            free( netif );

            return ERROR_CODE;

        }

        // mandatory name

        setting = measured_strings_find( & netif->configuration, CONF_NAME, 0 );

        if( ! setting ){

            printf( "The name is missing\n" );

            measured_strings_destroy( & netif->configuration );

            free( netif );

            return EINVAL;

        }

        netif->name = setting->value;

        // add to the netifs map

        index = netifs_add( & net_globals.netifs, netif->id, netif );

        if( index < 0 ){

            measured_strings_destroy( & netif->configuration );

            free( netif );

            return index;

        }

        // add to the netif names map

        if( ERROR_OCCURRED( char_map_add( & net_globals.netif_names, netif->name, 0, index ))

        // start network interfaces and needed modules

        || ERROR_OCCURRED( start_device( netif ))){

            measured_strings_destroy( & netif->configuration );

            netifs_exclude_index( & net_globals.netifs, index );

            return ERROR_CODE;

        }

        // increment modules' usage

        ++ netif->driver->usage;

        if( netif->nil ) ++ netif->nil->usage;

        ++ netif->il->usage;

        printf( "New network interface started:\n\tname\t= %s\n\tid\t= %d\n\tdriver\t= %s\n\tnil\t= %s\n\til\t= %s\n", netif->name, netif->id, netif->driver->name, netif->nil ? netif->nil->name : NULL, netif->il->name );

    }

    return EOK;

}

/** @}

 */