Projects/Webserver/Lib/TELNETServerApp.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  TELNET Webserver Application. When connected to the uIP stack,
  34  *  this will serve out connection information to the client.
  35  */
  36
  37 #define  INCLUDE_FROM_TELNETSERVERAPP_C
  38 #include "TELNETServerApp.h"
  39
  40 /** Welcome message to send to a TELNET client when a connection is first made. */
  41 char PROGMEM WelcomeHeader[] = "********************************************\r\n"
  42                                "*       LUFA uIP Webserver (TELNET)        *\r\n"
  43                                "********************************************\r\n";
  44
  45 /** Main TELNET menu, giving the user the list of available commands they may issue */
  46 char PROGMEM TELNETMenu[] = "\r\n"
  47                             "   Available Commands:\r\n"
  48                             "     c) List Active TCP Connections\r\n"
  49                                                 "\r\nCommand>";
  50
  51 /** Initialization function for the simple HTTP webserver. */
  52 void TELNETServerApp_Init(void)
  53 {
  54         /* Listen on port 23 for TELNET connections from hosts */
  55         uip_listen(HTONS(TELNET_SERVER_PORT));
  56 }
  57
  58 /** uIP stack application callback for the TELNET server. This function must be called each time the
  59  *  TCP/IP stack needs a TCP packet to be processed.
  60  */
  61 void TELNETServerApp_Callback(void)
  62 {
  63         uip_tcp_appstate_t* const AppState   = &uip_conn->appstate;
  64         char*               const AppData    = (char*)uip_appdata;
  65
  66         if (uip_connected())
  67         {
  68                 AppState->TELNETServer.CurrentState = TELNET_STATE_SendHeader;
  69         }
  70
  71         if (uip_acked())
  72         {
  73                 AppState->TELNETServer.CurrentState = AppState->TELNETServer.NextState;
  74         }
  75
  76         if (uip_rexmit() || uip_acked() || uip_newdata() || uip_connected() || uip_poll())
  77         {
  78                 switch (AppState->TELNETServer.CurrentState)
  79                 {
  80                         case TELNET_STATE_SendHeader:
  81                                 /* Copy over and send the TELNET welcome message upon first connection */
  82                                 strncpy_P(AppData, WelcomeHeader, strlen_P(WelcomeHeader));
  83                                 uip_send(AppData, strlen_P(WelcomeHeader));
  84
  85                                 AppState->TELNETServer.NextState = TELNET_STATE_SendMenu;
  86                                 break;
  87                         case TELNET_STATE_SendMenu:
  88                                 /* Copy over and send the TELNET menu to the client */
  89                                 strncpy_P(AppData, TELNETMenu, strlen_P(TELNETMenu));
  90                                 uip_send(AppData, strlen_P(TELNETMenu));
  91
  92                                 AppState->TELNETServer.NextState = TELNET_STATE_GetCommand;
  93                                 break;
  94                         case TELNET_STATE_GetCommand:
  95                                 if (!(uip_datalen()))
  96                                   break;
  97
  98                                 /* Save the issued command for later processing */
  99                                 AppState->TELNETServer.IssuedCommand = AppData[0];
 100
 101                                 AppState->TELNETServer.CurrentState  = TELNET_STATE_SendResponse;
 102                                 break;
 103                         case TELNET_STATE_SendResponse:
 104                                 /* Determine which command was issued, perform command processing */
 105                                 switch (AppState->TELNETServer.IssuedCommand)
 106                                 {
 107                                         case 'c':
 108                                                 TELNETServerApp_DisplayTCPConnections();
 109                                                 break;
 110                                 }
 111
 112                                 AppState->TELNETServer.NextState = TELNET_STATE_SendMenu;
 113                                 break;
 114                 }
 115         }
 116 }
 117
 118 /** Sends a list of active TCP connections to the TELNET client. */
 119 static void TELNETServerApp_DisplayTCPConnections(void)
 120 {
 121         char* const AppData    = (char*)uip_appdata;
 122
 123         strcpy(AppData, "\r\n* Current TCP Connections: *\r\n");
 124
 125         uint16_t ResponseLen     = strlen(AppData);
 126         uint8_t  ActiveConnCount = 0;
 127
 128         /* Loop through the complete uIP TCP connections list, looking for active connections */
 129         for (uint8_t i = 0; i < UIP_CONNS; i++)
 130         {
 131                 struct uip_conn* CurrConnection = &uip_conns[i];
 132
 133                 /* If the connection is not closed, it is active and must be added to the out buffer */
 134                 if (CurrConnection->tcpstateflags != UIP_CLOSED)
 135                 {
 136                         /* Add the current connection's details to the out buffer */
 137                         ResponseLen += sprintf(&AppData[ResponseLen], "%u) %02d.%02d.%02d.%02d (Local %u, Remote %u)\r\n",
 138                                                                    ++ActiveConnCount, CurrConnection->ripaddr.u8[0],
 139                                                                                                           CurrConnection->ripaddr.u8[1],
 140                                                                                                           CurrConnection->ripaddr.u8[2],
 141                                                                                                           CurrConnection->ripaddr.u8[3],
 142                                                                    HTONS(CurrConnection->lport), HTONS(CurrConnection->rport));
 143                 }
 144         }
 145
 146         uip_send(AppData, ResponseLen);
 147 }