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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 echo

 *  @{

 */

/** @file

 *  Echo application.

 *  Answers received packets.

 */

#include <malloc.h>

#include <stdio.h>

#include <string.h>

#include <task.h>

#include "../../include/in.h"

#include "../../include/in6.h"

#include "../../include/inet.h"

#include "../../include/socket.h"

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

#include "../parse.h"

#include "../print_error.h"

/** Echo module name.

 */

#define NAME    "Echo"

/** Module entry point.

 *  Reads command line parameters and starts listenning.

 *  @param[in] argc The number of command line parameters.

 *  @param[in] argv The command line parameters.

 *  @returns EOK on success.

 */

int     main( int argc, char * argv[] );

/** Prints the application help.

 */

void    echo_print_help( void );

/** Translates the character string to the protocol family number.

 *  @param[in] name The protocol family name.

 *  @returns The corresponding protocol family number.

 *  @returns EPFNOSUPPORTED if the protocol family is not supported.

 */

int     echo_parse_protocol_family( const char * name );

/** Translates the character string to the socket type number.

 *  @param[in] name The socket type name.

 *  @returns The corresponding socket type number.

 *  @returns ESOCKNOSUPPORTED if the socket type is not supported.

 */

int     echo_parse_socket_type( const char * name );

void echo_print_help( void ){

    printf(

        "Network Echo aplication\n" \

        "Usage: echo [options]\n" \

        "Where options are:\n" \

        "-b backlog | --backlog=size\n" \

        "\tThe size of the accepted sockets queue. Only for SOCK_STREAM. The default is 3.\n" \

        "\n" \

        "-c count | --count=count\n" \

        "\tThe number of received messages to handle. A negative number means infinity. The default is infinity.\n" \

        "\n" \

        "-f protocol_family | --family=protocol_family\n" \

        "\tThe listenning socket protocol family. Only the PF_INET and PF_INET6 are supported.\n"

        "\n" \

        "-h | --help\n" \

        "\tShow this application help.\n"

        "\n" \

        "-p port_number | --port=port_number\n" \

        "\tThe port number the application should listen at. The default is 7.\n" \

        "\n" \

        "-r reply_string | --reply=reply_string\n" \

        "\tThe constant reply string. The default is the original data received.\n" \

        "\n" \

        "-s receive_size | --size=receive_size\n" \

        "\tThe maximum receive data size the application should accept. The default is 1024 bytes.\n" \

        "\n" \

        "-t socket_type | --type=socket_type\n" \

        "\tThe listenning socket type. Only the SOCK_DGRAM and the SOCK_STREAM are supported.\n" \

        "\n" \

        "-v | --verbose\n" \

        "\tShow all output messages.\n"

    );

}

int echo_parse_protocol_family( const char * name ){

    if( str_lcmp( name, "PF_INET", 7 ) == 0 ){

        return PF_INET;

    }else if( str_lcmp( name, "PF_INET6", 8 ) == 0 ){

        return PF_INET6;

    }

    return EPFNOSUPPORT;

}

int echo_parse_socket_type( const char * name ){

    if( str_lcmp( name, "SOCK_DGRAM", 11 ) == 0 ){

        return SOCK_DGRAM;

    }else if( str_lcmp( name, "SOCK_STREAM", 12 ) == 0 ){

        return SOCK_STREAM;

    }

    return ESOCKTNOSUPPORT;

}

int main( int argc, char * argv[] ){

    ERROR_DECLARE;

    size_t              size            = 1024;

    int                 verbose         = 0;

    char *              reply           = NULL;

    sock_type_t         type            = SOCK_DGRAM;

    int                 count           = -1;

    int                 family          = PF_INET;

    uint16_t            port            = 7;

    int                 backlog         = 3;

    socklen_t           max_length      = sizeof( struct sockaddr_in6 );

    uint8_t             address_data[ max_length ];

    struct sockaddr *       address     = ( struct sockaddr * ) address_data;

    struct sockaddr_in *    address_in      = ( struct sockaddr_in * ) address;

    struct sockaddr_in6 *   address_in6 = ( struct sockaddr_in6 * ) address;

    socklen_t           addrlen;

    char                address_string[ INET6_ADDRSTRLEN ];

    uint8_t *           address_start;

    int                 socket_id;

    int                 listening_id;

    char *              data;

    size_t              length;

    int                 index;

    size_t              reply_length;

    int                 value;

    printf( "Task %d - ", task_get_id());

    printf( "%s\n", NAME );

    for( index = 1; index < argc; ++ index ){

        if( argv[ index ][ 0 ] == '-' ){

            switch( argv[ index ][ 1 ] ){

                case 'b':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & backlog, "accepted sockets queue size", 0 ));

                            break;

                case 'c':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & count, "message count", 0 ));

                            break;

                case 'f':   ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & family, "protocol family", 0, echo_parse_protocol_family ));

                            break;

                case 'h':   echo_print_help();

                            return EOK;

                            break;

                case 'p':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "port number", 0 ));

                            port = ( uint16_t ) value;

                            break;

                case 'r':   ERROR_PROPAGATE( parse_parameter_string( argc, argv, & index, & reply, "reply string", 0 ));

                            break;

                case 's':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "receive size", 0 ));

                            size = (value >= 0 ) ? ( size_t ) value : 0;

                            break;

                case 't':   ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & value, "socket type", 0, echo_parse_socket_type ));

                            type = ( sock_type_t ) value;

                            break;

                case 'v':   verbose = 1;

                            break;

                case '-':   if( str_lcmp( argv[ index ] + 2, "backlog=", 6 ) == 0 ){

                                ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & backlog, "accepted sockets queue size", 8 ));

                            }else if( str_lcmp( argv[ index ] + 2, "count=", 6 ) == 0 ){

                                ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & count, "message count", 8 ));

                            }else if( str_lcmp( argv[ index ] + 2, "family=", 7 ) == 0 ){

                                ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & family, "protocol family", 9, echo_parse_protocol_family ));

                            }else if( str_lcmp( argv[ index ] + 2, "help", 5 ) == 0 ){

                                echo_print_help();

                                return EOK;

                            }else if( str_lcmp( argv[ index ] + 2, "port=", 5 ) == 0 ){

                                ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "port number", 7 ));

                                port = ( uint16_t ) value;

                            }else if( str_lcmp( argv[ index ] + 2, "reply=", 6 ) == 0 ){

                                ERROR_PROPAGATE( parse_parameter_string( argc, argv, & index, & reply, "reply string", 8 ));

                            }else if( str_lcmp( argv[ index ] + 2, "size=", 5 ) == 0 ){

                                ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "receive size", 7 ));

                                size = (value >= 0 ) ? ( size_t ) value : 0;

                            }else if( str_lcmp( argv[ index ] + 2, "type=", 5 ) == 0 ){

                                ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & value, "socket type", 7, echo_parse_socket_type ));

                                type = ( sock_type_t ) value;

                            }else if( str_lcmp( argv[ index ] + 2, "verbose", 8 ) == 0 ){

                                verbose = 1;

                            }else{

                                print_unrecognized( index, argv[ index ] + 2 );

                                echo_print_help();

                                return EINVAL;

                            }

                            break;

                default:

                    print_unrecognized( index, argv[ index ] + 1 );

                    echo_print_help();

                    return EINVAL;

            }

        }else{

            print_unrecognized( index, argv[ index ] );

            echo_print_help();

            return EINVAL;

        }

    }

    if( size <= 0 ){

        fprintf( stderr, "Receive size too small (%d). Using 1024 bytes instead.\n", size );

        size = 1024;

    }

    // size plus terminating null (\0)

    data = ( char * ) malloc( size + 1 );

    if( ! data ){

        fprintf( stderr, "Failed to allocate receive buffer.\n" );

        return ENOMEM;

    }

    reply_length = reply ? str_length( reply ) : 0;

    listening_id = socket( family, type, 0 );

    if( listening_id < 0 ){

        socket_print_error( stderr, listening_id, "Socket create: ", "\n" );

        return listening_id;

    }

    bzero( address_data, max_length );

    switch( family ){

        case PF_INET:

            address_in->sin_family = AF_INET;

            address_in->sin_port = htons( port );

            addrlen = sizeof( struct sockaddr_in );

            break;

        case PF_INET6:

            address_in6->sin6_family = AF_INET6;

            address_in6->sin6_port = htons( port );

            addrlen = sizeof( struct sockaddr_in6 );

            break;

        default:

            fprintf( stderr, "Protocol family is not supported\n" );

            return EAFNOSUPPORT;

    }

    listening_id = socket( family, type, 0 );

    if( listening_id < 0 ){

        socket_print_error( stderr, listening_id, "Socket create: ", "\n" );

        return listening_id;

    }

    if( type == SOCK_STREAM ){

        if( backlog <= 0 ){

            fprintf( stderr, "Accepted sockets queue size too small (%d). Using 3 instead.\n", size );

            backlog = 3;

        }

        if( ERROR_OCCURRED( listen( listening_id, backlog ))){

            socket_print_error( stderr, ERROR_CODE, "Socket listen: ", "\n" );

            return ERROR_CODE;

        }

    }

    socket_id = listening_id;

    if( ERROR_OCCURRED( bind( listening_id, address, addrlen ))){

        socket_print_error( stderr, ERROR_CODE, "Socket bind: ", "\n" );

        return ERROR_CODE;

    }

    if( verbose ) printf( "Listenning at %d\n", port );

    while( count ){

        addrlen = max_length;

        if( type == SOCK_STREAM ){

            socket_id = accept( listening_id, address, & addrlen );

            if( socket_id <= 0 ){

                socket_print_error( stderr, socket_id, "Socket accept: ", "\n" );

            }

            if( verbose ) printf( "Socket %d accepted\n", socket_id );

        }

        if( socket_id > 0 ){

            value = recvfrom( socket_id, data, size, 0, address, & addrlen );

            if( value < 0 ){

                socket_print_error( stderr, value, "Socket receive: ", "\n" );

            }else{

                length = ( size_t ) value;

                if( verbose ){

                    address_start = NULL;

                    switch( address->sa_family ){

                        case AF_INET:

                            port = ntohs( address_in->sin_port );

                            address_start = ( uint8_t * ) & address_in->sin_addr.s_addr;

                            break;

                        case AF_INET6:

                            port = ntohs( address_in6->sin6_port );

                            address_start = ( uint8_t * ) & address_in6->sin6_addr.s6_addr;

                            break;

                        default:

                            fprintf( stderr, "Address family %d (0x%X) is not supported.\n", address->sa_family );

                    }

                    if( address_start ){

                        if( ERROR_OCCURRED( inet_ntop( address->sa_family, address_start, address_string, sizeof( address_string )))){

                            fprintf( stderr, "Received address error %d\n", ERROR_CODE );

                        }else{

                            data[ length ] = '\0';

                            printf( "Received %d bytes from %s:%d\n%s\n", length, address_string, port, data );

                        }

                    }

                }

                if( ERROR_OCCURRED( sendto( socket_id, reply ? reply : data, reply ? reply_length : length, 0, address, addrlen ))){

                    socket_print_error( stderr, ERROR_CODE, "Socket send: ", "\n" );

                }

            }

            if( type == SOCK_STREAM ){

                if( ERROR_OCCURRED( closesocket( socket_id ))){

                    socket_print_error( stderr, ERROR_CODE, "Close socket: ", "\n" );

                }

            }

        }

        if( count > 0 ){

            -- count;

            if( verbose ) printf( "Waiting for next %d packet(s)\n", count );

        }

    }

    if( verbose ) printf( "Closing the socket\n" );

    if( ERROR_OCCURRED( closesocket( listening_id ))){

        socket_print_error( stderr, ERROR_CODE, "Close socket: ", "\n" );

        return ERROR_CODE;

    }

    if( verbose ) printf( "Exiting\n" );

    return EOK;

}

/** @}

 */