TCPSocketServer.cpp

00001 /* Copyright (C) 2012 mbed.org, MIT License
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00005  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00006  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00007  * furnished to do so, subject to the following conditions:
00008  *
00009  * The above copyright notice and this permission notice shall be included in all copies or
00010  * substantial portions of the Software.
00011  *
00012  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017  */
00018 
00019 #include "TCPSocketServer.h"
00020 #include <string>
00021 
00022 TCPSocketServer::TCPSocketServer()
00023 {
00024     acceptIndex = 0;
00025 }
00026 
00027 // Server initialization
00028 int TCPSocketServer::bind(int port)
00029 {
00030     char cmd[20];
00031 
00032     // set TCP protocol
00033     wifi->setProtocol(TCP);
00034 
00035     // set ip local port #
00036     sprintf(cmd, "set i l %d\r", port);
00037     if (!wifi->sendCommand(cmd, "AOK"))
00038         return -1;
00039 
00040     // save
00041     if (!wifi->sendCommand("save\r", "Stor", NULL, 5000))
00042         return -1;
00043 
00044     // reboot
00045     wifi->reboot();
00046 
00047     // connect the network
00048     if (wifi->isDHCP()) {
00049         if (!wifi->sendCommand("join\r", "DHCP=ON", NULL, 10000))
00050             return -1;
00051     } else {
00052         if (!wifi->sendCommand("join\r", "Associated", NULL, 10000))
00053             return -1;
00054     }
00055 
00056     // exit
00057     wifi->exit();
00058 
00059     wait(0.2);
00060     wifi->flush();
00061     return 0;
00062 }
00063 
00064 int TCPSocketServer::listen(int backlog)
00065 {
00066     if (backlog != 1)
00067         return -1;
00068     return 0;
00069 }
00070 
00071 // sometimes simply "*OPEN*" comes in, and sometimes
00072 // a prior connection closes too, so we get "*CLOS**OPEN*".
00073 // When accepting a connection from a browser, it can be
00074 // *CLOS**OPEN*GET / HTTP/1.1
00075 // The point here is to remove everything to the left
00076 // of, and including, "*OPEN*" in order to accept this
00077 // connection, and the "GET / HTTP/1.1" is available
00078 // for consumption.
00079 //
00080 int TCPSocketServer::accept(TCPSocketConnection& connection)
00081 {
00082     int nb_available = 0;
00083     char c;
00084     const char OPEN[] = "*OPEN*";   // seeking this to accept
00085 
00086     acceptTimerStart();
00087     while (1) {
00088         nb_available = wifi->readable();
00089         if (nb_available == 0 && !_blocking && acceptTimeout())
00090             return -1;
00091         for (int i = 0; i < nb_available; i++) {
00092             c = wifi->getc();
00093             if (c != OPEN[acceptIndex])
00094                 acceptIndex = 0;
00095             if (c == OPEN[acceptIndex]) {
00096                 acceptIndex++;
00097                 if (acceptIndex == strlen(OPEN)) {
00098                     wifi->setConnectionState(true);
00099                     acceptIndex = 0;    // for next pass
00100                     return 0;
00101                 }
00102             }
00103         }
00104     }
00105 }
00106 
00107 void TCPSocketServer::acceptTimerStart()
00108 {
00109     acceptTimer.start();
00110 }
00111 
00112 bool TCPSocketServer::acceptTimeout()
00113 {
00114     if ((_timeout == 0) || (acceptTimer.read_ms() >= _timeout))
00115         return true;
00116     else
00117         return false;
00118 }