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  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup echo
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Echo application.
  35.  *  Answers received packets.
  36.  */
  37.  
  38. #include <malloc.h>
  39. #include <stdio.h>
  40. #include <string.h>
  41. #include <task.h>
  42.  
  43. #include "../../include/in.h"
  44. #include "../../include/in6.h"
  45. #include "../../include/inet.h"
  46. #include "../../include/socket.h"
  47.  
  48. #include "../../err.h"
  49.  
  50. #include "../parse.h"
  51. #include "../print_error.h"
  52.  
  53. /** Echo module name.
  54.  */
  55. #define NAME    "Echo"
  56.  
  57. /** Module entry point.
  58.  *  Reads command line parameters and starts listenning.
  59.  *  @param[in] argc The number of command line parameters.
  60.  *  @param[in] argv The command line parameters.
  61.  *  @returns EOK on success.
  62.  */
  63. int     main( int argc, char * argv[] );
  64.  
  65. /** Prints the application help.
  66.  */
  67. void    echo_print_help( void );
  68.  
  69. /** Translates the character string to the protocol family number.
  70.  *  @param[in] name The protocol family name.
  71.  *  @returns The corresponding protocol family number.
  72.  *  @returns EPFNOSUPPORTED if the protocol family is not supported.
  73.  */
  74. int     echo_parse_protocol_family( const char * name );
  75.  
  76. /** Translates the character string to the socket type number.
  77.  *  @param[in] name The socket type name.
  78.  *  @returns The corresponding socket type number.
  79.  *  @returns ESOCKNOSUPPORTED if the socket type is not supported.
  80.  */
  81. int     echo_parse_socket_type( const char * name );
  82.  
  83. void echo_print_help( void ){
  84.     printf(
  85.         "Network Echo aplication\n" \
  86.         "Usage: echo [options]\n" \
  87.         "Where options are:\n" \
  88.         "-b backlog | --backlog=size\n" \
  89.         "\tThe size of the accepted sockets queue. Only for SOCK_STREAM. The default is 3.\n" \
  90.         "\n" \
  91.         "-c count | --count=count\n" \
  92.         "\tThe number of received messages to handle. A negative number means infinity. The default is infinity.\n" \
  93.         "\n" \
  94.         "-f protocol_family | --family=protocol_family\n" \
  95.         "\tThe listenning socket protocol family. Only the PF_INET and PF_INET6 are supported.\n"
  96.         "\n" \
  97.         "-h | --help\n" \
  98.         "\tShow this application help.\n"
  99.         "\n" \
  100.         "-p port_number | --port=port_number\n" \
  101.         "\tThe port number the application should listen at. The default is 7.\n" \
  102.         "\n" \
  103.         "-r reply_string | --reply=reply_string\n" \
  104.         "\tThe constant reply string. The default is the original data received.\n" \
  105.         "\n" \
  106.         "-s receive_size | --size=receive_size\n" \
  107.         "\tThe maximum receive data size the application should accept. The default is 1024 bytes.\n" \
  108.         "\n" \
  109.         "-t socket_type | --type=socket_type\n" \
  110.         "\tThe listenning socket type. Only the SOCK_DGRAM and the SOCK_STREAM are supported.\n" \
  111.         "\n" \
  112.         "-v | --verbose\n" \
  113.         "\tShow all output messages.\n"
  114.     );
  115. }
  116.  
  117. int echo_parse_protocol_family( const char * name ){
  118.     if( str_lcmp( name, "PF_INET", 7 ) == 0 ){
  119.         return PF_INET;
  120.     }else if( str_lcmp( name, "PF_INET6", 8 ) == 0 ){
  121.         return PF_INET6;
  122.     }
  123.     return EPFNOSUPPORT;
  124. }
  125.  
  126. int echo_parse_socket_type( const char * name ){
  127.     if( str_lcmp( name, "SOCK_DGRAM", 11 ) == 0 ){
  128.         return SOCK_DGRAM;
  129.     }else if( str_lcmp( name, "SOCK_STREAM", 12 ) == 0 ){
  130.         return SOCK_STREAM;
  131.     }
  132.     return ESOCKTNOSUPPORT;
  133. }
  134.  
  135. int main( int argc, char * argv[] ){
  136.     ERROR_DECLARE;
  137.  
  138.     size_t              size            = 1024;
  139.     int                 verbose         = 0;
  140.     char *              reply           = NULL;
  141.     sock_type_t         type            = SOCK_DGRAM;
  142.     int                 count           = -1;
  143.     int                 family          = PF_INET;
  144.     uint16_t            port            = 7;
  145.     int                 backlog         = 3;
  146.  
  147.     socklen_t           max_length      = sizeof( struct sockaddr_in6 );
  148.     uint8_t             address_data[ max_length ];
  149.     struct sockaddr *       address     = ( struct sockaddr * ) address_data;
  150.     struct sockaddr_in *    address_in      = ( struct sockaddr_in * ) address;
  151.     struct sockaddr_in6 *   address_in6 = ( struct sockaddr_in6 * ) address;
  152.     socklen_t           addrlen;
  153.     char                address_string[ INET6_ADDRSTRLEN ];
  154.     uint8_t *           address_start;
  155.     int                 socket_id;
  156.     int                 listening_id;
  157.     char *              data;
  158.     size_t              length;
  159.     int                 index;
  160.     size_t              reply_length;
  161.     int                 value;
  162.  
  163.     printf( "Task %d - ", task_get_id());
  164.     printf( "%s\n", NAME );
  165.  
  166.     for( index = 1; index < argc; ++ index ){
  167.         if( argv[ index ][ 0 ] == '-' ){
  168.             switch( argv[ index ][ 1 ] ){
  169.                 case 'b':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & backlog, "accepted sockets queue size", 0 ));
  170.                             break;
  171.                 case 'c':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & count, "message count", 0 ));
  172.                             break;
  173.                 case 'f':   ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & family, "protocol family", 0, echo_parse_protocol_family ));
  174.                             break;
  175.                 case 'h':   echo_print_help();
  176.                             return EOK;
  177.                             break;
  178.                 case 'p':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "port number", 0 ));
  179.                             port = ( uint16_t ) value;
  180.                             break;
  181.                 case 'r':   ERROR_PROPAGATE( parse_parameter_string( argc, argv, & index, & reply, "reply string", 0 ));
  182.                             break;
  183.                 case 's':   ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "receive size", 0 ));
  184.                             size = (value >= 0 ) ? ( size_t ) value : 0;
  185.                             break;
  186.                 case 't':   ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & value, "socket type", 0, echo_parse_socket_type ));
  187.                             type = ( sock_type_t ) value;
  188.                             break;
  189.                 case 'v':   verbose = 1;
  190.                             break;
  191.                 case '-':   if( str_lcmp( argv[ index ] + 2, "backlog=", 6 ) == 0 ){
  192.                                 ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & backlog, "accepted sockets queue size", 8 ));
  193.                             }else if( str_lcmp( argv[ index ] + 2, "count=", 6 ) == 0 ){
  194.                                 ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & count, "message count", 8 ));
  195.                             }else if( str_lcmp( argv[ index ] + 2, "family=", 7 ) == 0 ){
  196.                                 ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & family, "protocol family", 9, echo_parse_protocol_family ));
  197.                             }else if( str_lcmp( argv[ index ] + 2, "help", 5 ) == 0 ){
  198.                                 echo_print_help();
  199.                                 return EOK;
  200.                             }else if( str_lcmp( argv[ index ] + 2, "port=", 5 ) == 0 ){
  201.                                 ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "port number", 7 ));
  202.                                 port = ( uint16_t ) value;
  203.                             }else if( str_lcmp( argv[ index ] + 2, "reply=", 6 ) == 0 ){
  204.                                 ERROR_PROPAGATE( parse_parameter_string( argc, argv, & index, & reply, "reply string", 8 ));
  205.                             }else if( str_lcmp( argv[ index ] + 2, "size=", 5 ) == 0 ){
  206.                                 ERROR_PROPAGATE( parse_parameter_int( argc, argv, & index, & value, "receive size", 7 ));
  207.                                 size = (value >= 0 ) ? ( size_t ) value : 0;
  208.                             }else if( str_lcmp( argv[ index ] + 2, "type=", 5 ) == 0 ){
  209.                                 ERROR_PROPAGATE( parse_parameter_name_int( argc, argv, & index, & value, "socket type", 7, echo_parse_socket_type ));
  210.                                 type = ( sock_type_t ) value;
  211.                             }else if( str_lcmp( argv[ index ] + 2, "verbose", 8 ) == 0 ){
  212.                                 verbose = 1;
  213.                             }else{
  214.                                 print_unrecognized( index, argv[ index ] + 2 );
  215.                                 echo_print_help();
  216.                                 return EINVAL;
  217.                             }
  218.                             break;
  219.                 default:
  220.                     print_unrecognized( index, argv[ index ] + 1 );
  221.                     echo_print_help();
  222.                     return EINVAL;
  223.             }
  224.         }else{
  225.             print_unrecognized( index, argv[ index ] );
  226.             echo_print_help();
  227.             return EINVAL;
  228.         }
  229.     }
  230.  
  231.     if( size <= 0 ){
  232.         fprintf( stderr, "Receive size too small (%d). Using 1024 bytes instead.\n", size );
  233.         size = 1024;
  234.     }
  235.     // size plus terminating null (\0)
  236.     data = ( char * ) malloc( size + 1 );
  237.     if( ! data ){
  238.         fprintf( stderr, "Failed to allocate receive buffer.\n" );
  239.         return ENOMEM;
  240.     }
  241.  
  242.     reply_length = reply ? str_length( reply ) : 0;
  243.  
  244.     listening_id = socket( family, type, 0 );
  245.     if( listening_id < 0 ){
  246.         socket_print_error( stderr, listening_id, "Socket create: ", "\n" );
  247.         return listening_id;
  248.     }
  249.  
  250.     bzero( address_data, max_length );
  251.     switch( family ){
  252.         case PF_INET:
  253.             address_in->sin_family = AF_INET;
  254.             address_in->sin_port = htons( port );
  255.             addrlen = sizeof( struct sockaddr_in );
  256.             break;
  257.         case PF_INET6:
  258.             address_in6->sin6_family = AF_INET6;
  259.             address_in6->sin6_port = htons( port );
  260.             addrlen = sizeof( struct sockaddr_in6 );
  261.             break;
  262.         default:
  263.             fprintf( stderr, "Protocol family is not supported\n" );
  264.             return EAFNOSUPPORT;
  265.     }
  266.  
  267.     listening_id = socket( family, type, 0 );
  268.     if( listening_id < 0 ){
  269.         socket_print_error( stderr, listening_id, "Socket create: ", "\n" );
  270.         return listening_id;
  271.     }
  272.  
  273.     if( type == SOCK_STREAM ){
  274.         if( backlog <= 0 ){
  275.             fprintf( stderr, "Accepted sockets queue size too small (%d). Using 3 instead.\n", size );
  276.             backlog = 3;
  277.         }
  278.         if( ERROR_OCCURRED( listen( listening_id, backlog ))){
  279.             socket_print_error( stderr, ERROR_CODE, "Socket listen: ", "\n" );
  280.             return ERROR_CODE;
  281.         }
  282.     }
  283.  
  284.     socket_id = listening_id;
  285.  
  286.     if( ERROR_OCCURRED( bind( listening_id, address, addrlen ))){
  287.         socket_print_error( stderr, ERROR_CODE, "Socket bind: ", "\n" );
  288.         return ERROR_CODE;
  289.     }
  290.  
  291.     if( verbose ) printf( "Listenning at %d\n", port );
  292.  
  293.     while( count ){
  294.         addrlen = max_length;
  295.         if( type == SOCK_STREAM ){
  296.             socket_id = accept( listening_id, address, & addrlen );
  297.             if( socket_id <= 0 ){
  298.                 socket_print_error( stderr, socket_id, "Socket accept: ", "\n" );
  299.             }
  300.             if( verbose ) printf( "Socket %d accepted\n", socket_id );
  301.         }
  302.         if( socket_id > 0 ){
  303.             value = recvfrom( socket_id, data, size, 0, address, & addrlen );
  304.             if( value < 0 ){
  305.                 socket_print_error( stderr, value, "Socket receive: ", "\n" );
  306.             }else{
  307.                 length = ( size_t ) value;
  308.                 if( verbose ){
  309.                     address_start = NULL;
  310.                     switch( address->sa_family ){
  311.                         case AF_INET:
  312.                             port = ntohs( address_in->sin_port );
  313.                             address_start = ( uint8_t * ) & address_in->sin_addr.s_addr;
  314.                             break;
  315.                         case AF_INET6:
  316.                             port = ntohs( address_in6->sin6_port );
  317.                             address_start = ( uint8_t * ) & address_in6->sin6_addr.s6_addr;
  318.                             break;
  319.                         default:
  320.                             fprintf( stderr, "Address family %d (0x%X) is not supported.\n", address->sa_family );
  321.                     }
  322.                     if( address_start ){
  323.                         if( ERROR_OCCURRED( inet_ntop( address->sa_family, address_start, address_string, sizeof( address_string )))){
  324.                             fprintf( stderr, "Received address error %d\n", ERROR_CODE );
  325.                         }else{
  326.                             data[ length ] = '\0';
  327.                             printf( "Received %d bytes from %s:%d\n%s\n", length, address_string, port, data );
  328.                         }
  329.                     }
  330.                 }
  331.                 if( ERROR_OCCURRED( sendto( socket_id, reply ? reply : data, reply ? reply_length : length, 0, address, addrlen ))){
  332.                     socket_print_error( stderr, ERROR_CODE, "Socket send: ", "\n" );
  333.                 }
  334.             }
  335.             if( type == SOCK_STREAM ){
  336.                 if( ERROR_OCCURRED( closesocket( socket_id ))){
  337.                     socket_print_error( stderr, ERROR_CODE, "Close socket: ", "\n" );
  338.                 }
  339.             }
  340.         }
  341.         if( count > 0 ){
  342.             -- count;
  343.             if( verbose ) printf( "Waiting for next %d packet(s)\n", count );
  344.         }
  345.     }
  346.  
  347.     if( verbose ) printf( "Closing the socket\n" );
  348.  
  349.     if( ERROR_OCCURRED( closesocket( listening_id ))){
  350.         socket_print_error( stderr, ERROR_CODE, "Close socket: ", "\n" );
  351.         return ERROR_CODE;
  352.     }
  353.  
  354.     if( verbose ) printf( "Exiting\n" );
  355.  
  356.     return EOK;
  357. }
  358.  
  359. /** @}
  360.  */
  361.