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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

 */

#include <async.h>

#include <ctype.h>

#include <errno.h>

#include <malloc.h>

#include <stdio.h>

#include <task.h>

#include <unistd.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include "../err.h"

#include "../messages.h"

#include "../modules.h"

//#include "../self_test.h"

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

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

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

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

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

#include "../il/ip/ip_messages.h"

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

#if IP_BUNDLE

    #include "../ip/ip_module.h"

#endif

#if TCP_BUNDLE

    #include "../tcp/tcp_module.h"

#endif

#define NAME    "Networking"

#define LO_NAME             "lo"

#define LO_FILENAME         "/sbin/lo"

#define DP8390_ISA_NAME         "dp8390_isa"

#define DP8390_ISA_FILENAME     "/sbin/dp8380_isa"

#define ETHERNET_NAME           "ethernet"

#define ETHERNET_FILENAME       "/sbin/ethernet"

#define IP_NAME             "ip"

#define IP_FILENAME         "/sbin/ip"

#define IPC_GET_DEVICE( call )  ( device_id_t ) IPC_GET_ARG1( * call )

#define IPC_GET_COUNT( call )   ( int ) IPC_GET_ARG2( * call )

typedef struct module_struct    module_t;

typedef module_t *      module_ref;

typedef struct netif        netif_t;

typedef netif_t *       netif_ref;

typedef struct networking_globals   networking_globals_t;

DEVICE_MAP_DECLARE( netifs, netif_t )

GENERIC_CHAR_MAP_DECLARE( measured_strings, measured_string_t )

GENERIC_CHAR_MAP_DECLARE( modules, module_t )

struct module_struct{

    task_id_t   task_id;

    services_t  service;

    int     phone;

    int     usage;

    const char *    name;

    const char *    filename;

};

/** A present network interface device.

 */

struct netif{

    /** A system-unique network interface identifier.

     */

    device_id_t     id;

    /** A serving network interface driver module index.

     */

    module_ref      driver;

    /** A serving link layer module index.

     */

    module_ref      nil;

    /** A serving internet layer module index.

     */

    module_ref      il;

    /** A system-unique network interface name.

     */

    char *          name;

    /** Configuration.

     */

    measured_strings_t  configuration;

};

/** A networking module global variables.

 */

struct networking_globals{

    /** Present network interfaces.

     */

    netifs_t        netifs;

    /** Network interface structure indices by names.

     */

    char_map_t      netif_names;

    /** Available modules.

     */

    modules_t       modules;

    /** Global configuration.

     */

    measured_strings_t  configuration;

};

void    networking_print_name( void );

int     add_module( module_ref * module, modules_ref modules, const char const * name, const char const * filename, services_t service, task_id_t task_id );

static void client_connection( ipc_callid_t iid, ipc_call_t * icall );

measured_string_ref configuration_find( measured_strings_ref configuration, const char * name );

int networking_start_module( async_client_conn_t client_connection );

int     networking_initialize( void );

int networking_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count );

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

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

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

int     read_configuration( void );

task_id_t   spawn( const char * fname );

int     startup( void );

device_id_t generate_new_device_id( void );

static networking_globals_t networking_globals;

DEVICE_MAP_IMPLEMENT( netifs, netif_t )

GENERIC_CHAR_MAP_IMPLEMENT( measured_strings, measured_string_t )

GENERIC_CHAR_MAP_IMPLEMENT( modules, module_t )

void networking_print_name( void ){

    printf( NAME );

}

int add_module( module_ref * module, modules_ref modules, const char * name, const char * filename, services_t service, task_id_t task_id ){

    ERROR_DECLARE;

    module_ref  tmp_module;

    tmp_module = ( module_ref ) malloc( sizeof( module_t ));

    if( ! tmp_module ) return ENOMEM;

    tmp_module->task_id = task_id;

    tmp_module->phone = 0;

    tmp_module->usage = 0;

    tmp_module->name = name;

    tmp_module->filename = filename;

    tmp_module->service = service;

    if( ERROR_OCCURRED( modules_add( modules, tmp_module->name, 0, tmp_module ))){

        free( tmp_module );

        return ERROR_CODE;

    }

    if( module ) * module = tmp_module;

    return EOK;

}

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

#ifdef NETWORKING_module

        //TODO map to *_message

        if( IS_NET_IL_MESSAGE( call ) || IS_NET_IP_MESSAGE( call )){

            return ip_message( callid, call, answer, answer_count );

/*      }else if( IS_NET_ARP_MESSAGE( call )){

            return arp_message( callid, call, answer, answer_count );

*//*        }else if( IS_NET_RARP_MESSAGE( call )){

            return rarp_message( callid, call, answer, answer_count );

*//*        }else if( IS_NET_ICMP_MESSAGE( call )){

            return icmp_message( callid, call, answer, answer_count );

*//*        }else if( IS_NET_UDP_MESSAGE( call )){

            return udp_message( callid, call, answer, answer_count );

*/      }else if( IS_NET_TCP_MESSAGE( call )){

            return tcp_message( callid, call, answer, answer_count );

/*      }else if( IS_NET_SOCKET_MESSAGE( call )){

            return socket_message( callid, call, answer, answer_count );

*//*        }else if( IS_NET_NIL_MESSAGE( call ) || IS_NET_ETHERNET_MESSAGE( call )){

            return ethernet_message( callid, call, answer, answer_count );

*/      }else{

#endif

            if( IS_NET_PACKET_MESSAGE( call )){

                return packet_server_message( callid, call, answer, answer_count );

            }else{

                return net_message( callid, call, answer, answer_count );

            }

#ifdef NETWORKING_module

        }

#endif

}

int networking_start_module( async_client_conn_t client_connection ){

    ERROR_DECLARE;

    ipcarg_t    phonehash;

    async_set_client_connection( client_connection );

    ERROR_PROPAGATE( pm_init());

    if( ERROR_OCCURRED( networking_initialize())

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

        pm_destroy();

        return ERROR_CODE;

    }

    async_manager();

    pm_destroy();

    return EOK;

}

int networking_initialize( void ){

    ERROR_DECLARE;

    task_id_t   task_id;

    netifs_initialize( & networking_globals.netifs );

    char_map_initialize( & networking_globals.netif_names );

    modules_initialize( & networking_globals.modules );

    measured_strings_initialize( & networking_globals.configuration );

    // run self tests

//  ERROR_PROPAGATE( self_test());

    ERROR_PROPAGATE( add_module( NULL, & networking_globals.modules, LO_NAME, LO_FILENAME, SERVICE_LO, 0 ));

    ERROR_PROPAGATE( add_module( NULL, & networking_globals.modules, DP8390_ISA_NAME, DP8390_ISA_FILENAME, SERVICE_DP8390_ISA, 0 ));

    ERROR_PROPAGATE( add_module( NULL, & networking_globals.modules, ETHERNET_NAME, ETHERNET_FILENAME, SERVICE_ETHERNET, 0 ));

#ifdef NETWORKING_modular

    task_id = spawn( "/sbin/ip" );

    if( ! task_id ) return EINVAL;

    ERROR_PROPAGATE( add_module( NULL, & networking_globals.modules, IP_NAME, IP_FILENAME, SERVICE_IP, task_id ));

//  if( ! spawn( "/sbin/udp" )) return EINVAL;

    if( ! spawn( "/sbin/tcp" )) return EINVAL;

//  if( ! spawn( "/sbin/socket" )) return EINVAL;

//  not always necesssary

//  if( ! spawn( "/sbin/arp" )) return EINVAL;

//  if( ! spawn( "/sbin/rarp" )) return EINVAL;

//  if( ! spawn( "/sbin/icmp" )) return EINVAL;

#else

#ifdef NETWORKING_module

    ipcarg_t    phonehash;

    ERROR_PROPAGATE( REGISTER_ME( SERVICE_IP, & phonehash ));

    ERROR_PROPAGATE( add_module( NULL, & networking_globals.modules, IP_NAME, IP_FILENAME, SERVICE_IP, task_get_id()));

    ERROR_PROPAGATE( ip_initialize());

//  ERROR_PROPAGATE( REGISTER_ME( SERVICE_ARP, & phonehash ));

//  ERROR_PROPAGATE( arp_initialize());

//  ERROR_PROPAGATE( REGISTER_ME( SERVICE_RARP, & phonehash ));

//  ERROR_PROPAGATE( rarp_initialize());

//  ERROR_PROPAGATE( REGISTER_ME( SERVICE_ICMP, & phonehash ));

//  ERROR_PROPAGATE( icmp_initialize());

//  ERROR_PROPAGATE( REGISTER_ME( SERVICE_UDP, & phonehash ));

//  ERROR_PROPAGATE( udp_initialize());

    ERROR_PROPAGATE( REGISTER_ME( SERVICE_TCP, & phonehash ));

    ERROR_PROPAGATE( tcp_initialize());

//  ERROR_PROPAGATE( REGISTER_ME( SERVICE_SOCKET, & phonehash ));

//  ERROR_PROPAGATE( socket_initialize());

//  ERROR_PROPAGATE( REGISTER_ME( SERVICE_ETHERNET, & phonehash ));

//  ERROR_PROPAGATE( ethernet_initialize());

#endif

#endif

    return EOK;

}

//TODO as ip.c

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;

    int         index;

    measured_string_ref setting;

    measured_strings_ref    configuration;

    netif_ref       netif;

    * answer_count = 0;

    switch( IPC_GET_METHOD( * call )){

        case IPC_M_PHONE_HUNGUP:

            return EOK;

        case NET_NET_DEVICE:

            // TODO configure, register

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

            return EOK;

        case NET_NET_GET_DEVICE_CONF:

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

            netif = netifs_find( & networking_globals.netifs, IPC_GET_DEVICE( call ));

            if( netif ){

                configuration = & netif->configuration;

            }else{

                configuration = NULL;

            }

            for( index = 0; index < IPC_GET_COUNT( call ); ++ index ){

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

                if( ! setting ){

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

                }

                if( setting ){

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

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

                }else{

                    strings[ index ].length = 0;

                    strings[ index ].value = 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:

            // arg1 = count

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

            for( index = 0; index < IPC_GET_COUNT( call ); ++ index ){

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

                if( setting ){

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

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

                }else{

                    strings[ index ].length = 0;

                    strings[ index ].value = 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 netifs_count( & networking_globals.netifs ) + 1;

}

int read_configuration( void ){

    ERROR_DECLARE;

    netif_ref       netif;

    measured_string_ref setting;

    services_t      internet_service;

    int         index;

    // read general configuration

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

    // read network interfaces configuration

    // static loopback initialization

//  printf( "\nloopback initialization" );

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

    if( ! netif ) return ENOMEM;

    netif->id = generate_new_device_id();

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

    if( ERROR_OCCURRED( add_configuration( & netif->configuration, "NAME", LO_NAME ))

    || ERROR_OCCURRED( add_configuration( & netif->configuration, "NETIF", LO_NAME ))

    || ERROR_OCCURRED( add_configuration( & netif->configuration, "IL", IP_NAME ))

    || ERROR_OCCURRED( add_configuration( & netif->configuration, "MTU", "1500" ))

    || ERROR_OCCURRED( add_configuration( & netif->configuration, "IP_CONFIG", "STATIC" ))

    || ERROR_OCCURRED( add_configuration( & netif->configuration, "IP_ADDR", "127.0.0.1" ))

    || ERROR_OCCURRED( add_configuration( & netif->configuration, "NETMASK", "255.0.0.0" ))){

        measured_strings_destroy( & netif->configuration );

        free( netif );

        return ERROR_CODE;

    }

    // mandatory name

//  printf( "\n\tname" );

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

    if( ! setting ){

        measured_strings_destroy( & netif->configuration );

        free( netif );

        return EINVAL;

    }

    netif->name = setting->value;

//  printf( " %s OK", netif->name );

    // mandatory netif

//  printf( "\n\tnetif" );

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

    if( ! setting ){

//      printf( " unknown" );

        measured_strings_destroy( & netif->configuration );

        free( netif );

        return EINVAL;

    }

//  printf( " find %s in %d?", setting->value, modules_count( & networking_globals.modules ));

    netif->driver = modules_find( & networking_globals.modules, setting->value, 0 );

    if( ! netif->driver ){

//      printf( " not found" );

        // TODO register the unknown one

        measured_strings_destroy( & netif->configuration );

        free( netif );

        return EINVAL;

    }

//  printf( " found" );

    if( ! netif->driver->task_id ){

        netif->driver->task_id = spawn( netif->driver->filename );

        if( ! netif->driver->task_id ){

            measured_strings_destroy( & netif->configuration );

            free( netif );

            return EINVAL;

        }

    }

//  printf( " OK" );

    // optional link layer

//  printf( "\n\tlink layer" );

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

    if( setting ){

        netif->nil = modules_find( & networking_globals.modules, setting->value, 0 );

        if( ! netif->nil ){

            // TODO register the unknown one

            -- netif->driver->usage;

            measured_strings_destroy( & netif->configuration );

            free( netif );

            return EINVAL;

        }

        if( ! netif->nil->task_id ){

            netif->nil->task_id = spawn( netif->nil->filename );

            if( ! netif->nil->task_id ){

                -- netif->driver->usage;

                measured_strings_destroy( & netif->configuration );

                free( netif );

                return EINVAL;

            }

        }

    }else{

        netif->nil = NULL;

    }

    // mandatory internet layer

//  printf( "\n\tinternet layer" );

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

    if( ! setting ){

        -- netif->driver->usage;

        -- netif->nil->usage;

        measured_strings_destroy( & netif->configuration );

        free( netif );

        return EINVAL;

    }

//  printf( " set %s", setting->value );

    netif->il = modules_find( & networking_globals.modules, setting->value, 0 );

    if( ! netif->il ){

        // TODO register the unknown one

        -- netif->driver->usage;

        -- netif->nil->usage;

        measured_strings_destroy( & netif->configuration );

        free( netif );

        return EINVAL;

    }

//  printf( " found" );

    if( ! netif->il->task_id ){

        netif->il->task_id = spawn( netif->il->filename );

        if( ! netif->il->task_id ){

            -- netif->driver->usage;

            -- netif->nil->usage;

            measured_strings_destroy( & netif->configuration );

            free( netif );

            return EINVAL;

        }

    }

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

    if( index < 0 ){

        free( netif );

        return ERROR_CODE;

    }

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

        netifs_exclude_index( & networking_globals.netifs, index );

        return ERROR_CODE;

    }

//  printf( "\nloopback OK" );

    // end of the static loopback initialization

    // startup the loopback interface

    if( ! netif->driver->phone ){

//      printf( " connect?" );

        netif->driver->phone = connect_to_service( netif->driver->service );

    }

//  printf( " connected" );

    // TODO io, irq

    ERROR_PROPAGATE( async_req_3_0( netif->driver->phone, NET_NETIF_PROBE, netif->id, 0, 0 ));

    ++ netif->driver->usage;

    if( netif->nil ){

        if( ! netif->nil->phone ){

            netif->nil->phone = connect_to_service( netif->nil->service );

        }

        ERROR_PROPAGATE( async_req_2_0( netif->nil->phone, NET_NIL_DEVICE, netif->id, netif->driver->service ));

        ++ netif->nil->usage;

        internet_service = netif->nil->service;

//      printf( " OK" );

    }else{

        internet_service = netif->driver->service;

//      printf( " none" );

    }

    if( ! netif->il->phone ){

//      printf( " connect" );

        netif->il->phone = connect_to_service( netif->il->service );

    }

    // TODO IL_BUNDLE

    ERROR_PROPAGATE( async_req_2_0( netif->il->phone, NET_IL_DEVICE, netif->id, internet_service ));

    ++ netif->il->usage;

    // TODO startup?

    ERROR_PROPAGATE( async_req_1_0( netif->driver->phone, NET_NETIF_START, netif->id ));

//  printf( "\n LO OK" );

    return EOK;

}

task_id_t spawn( const char * fname ){

    const char  * argv[ 2 ];

    task_id_t   res;

//  printf( "Spawning %s\n", fname );

    argv[ 0 ] = fname;

    argv[ 1 ] = NULL;

    res = task_spawn( fname, argv );

    if( res != 0 ){

        /* Success */

        usleep( 50000 );

    }

    return res;

}

int startup( void ){

    ERROR_DECLARE;

    // read configuration files

    if( ERROR_OCCURRED( read_configuration())) return ERROR_CODE;

    // start network interfaces and needed modules

//  start_device( "/sbin/lo", "/sbin/dummy_link_layer" );

    return EOK;

}

/** @}

 */