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