[lwip-users] tcp connection problem

hello,

I am using FreeRTOS 4.1.0 - OS, lwIP 1.1.1 and ppp. PPP, IP, ICMP (ping) work fine and is stable I hope.

I have problem with TCP. I make http server. Ather telnet ip 80 connection is made (TCP_DEBUG: TCP connection established ...->80) and then OS crashes. I did analise => OS is halt on TCP_EVENT_ACCEPT(pcb, ERR_OK, err); in tcp_in.c (tcp_process). Have you any ideas?

My server code:

//--------------------------------------------------------------- inicjalizacja lwIP ---------------------------------------------

/*void tcpip_init_done(void * arg)
{
sys_sem_t *sem = arg;
sys_sem_signal(*sem);
} */

void vlwIPInit( void )
{
// sys_sem_t sem;

    /* Initialize lwIP and its interface layer. */
sys_init();
mem_init();
memp_init();
pbuf_init();
netif_init();
ip_init();   // wykonywane takze przez tcpip_init
tcpip_init( NULL, NULL ); // bez samafory

/*   sem = sys_sem_new(0);
   tcpip_init(tcpip_init_done, &sem);
   sys_sem_wait(sem);
   sys_sem_free(sem); */
}

//------------------------------------------------------------ serwer http ---------------------------------------------------------------
/*------------------------------------------------------------*/
/* The size of the buffer in which the dynamic WEB page is created. */
#define webMAX_PAGE_SIZE 2048

/* Standard GET response. */
#define webHTTP_OK "HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n"

/* The port on which we listen. */
#define webHTTP_PORT ( 80 )

/* Delay on close error. */
#define webSHORT_DELAY ( 10 )

/* Format of the dynamic page that is returned on each connection. */
#define webHTML_START \
"<html>\
<head>\
</head>\
<BODY >\r\nPage Hits = "

#define webHTML_END \
"\r\n</pre>\
\r\n</BODY>\
</html>"

/*
* Process an incoming connection on port 80.
*
* This simply checks to see if the incoming data contains a GET request, and
* if so sends back a single dynamically created page. The connection is then
* closed. A more complete implementation could create a task for each
* connection.
*/
static void vProcessConnection( struct netconn *pxNetCon );

/*------------------------------------------------------------*/

static void vProcessConnection( struct netconn *pxNetCon )
{
static portCHAR cDynamicPage[ webMAX_PAGE_SIZE ], cPageHits[ 11 ];
struct netbuf *pxRxBuffer;
portCHAR *pcRxString;
unsigned portSHORT usLength;
static unsigned portLONG ulPageHits = 0;

/* We expect to immediately get data. */
pxRxBuffer = netconn_recv( pxNetCon );

if( pxRxBuffer != NULL )
{
  /* Where is the data? */
  netbuf_data( pxRxBuffer, ( void * ) &pcRxString, &usLength );

  /* Is this a GET? We don't handle anything else. */
  if( !strncmp( pcRxString, "GET", 3 ) )
  {
   pcRxString = cDynamicPage;

   /* Update the hit count. */
   ulPageHits++;
   sprintf( cPageHits, "%lu", ulPageHits );

/* Write out the HTTP OK header. */
netconn_write(pxNetCon, webHTTP_OK, (u16_t)strlen( webHTTP_OK ), NETCONN_COPY );

/* Generate the dynamic page...

   ... First the page header. */
   strcpy( cDynamicPage, webHTML_START );
   /* ... Then the hit count... */
   strcat( cDynamicPage, cPageHits );
   strcat( cDynamicPage, "<p><pre>Task          State Priority Stack #<br>************************************************<br>" );
   /* ... Then the list of tasks and their status... */
   vTaskList( ( signed portCHAR * ) cDynamicPage + strlen( cDynamicPage ) );
   /* ... Finally the page footer. */
   strcat( cDynamicPage, webHTML_END );

   /* Write out the dynamically generated page. */
   netconn_write(pxNetCon, cDynamicPage, (u16_t)strlen( cDynamicPage ), NETCONN_COPY );
  }

  netbuf_delete( pxRxBuffer );
}

netconn_close( pxNetCon );
}
/*------------------------------------------------------------*/
#define mainWEBSERVER_PRIORITY ( tskIDLE_PRIORITY + 2 )

void vBasicWEBServer( void *pvParameters )
{
struct netconn *pxHTTPListener, *pxNewConnection;

/* Create a new tcp connection handle */

kprintf("http serv lev 0\n");
pxHTTPListener = netconn_new( NETCONN_TCP );
kprintf("http serv lev 1\n");
netconn_bind(pxHTTPListener, NULL, webHTTP_PORT );
kprintf("http serv lev 2\n");
netconn_listen( pxHTTPListener );
kprintf("http serv lev 3\n");

/* Loop forever */
for( ;; )
{
  kprintf("http serv lev 4\n");
  /* Wait for connection. */
  pxNewConnection = netconn_accept(pxHTTPListener); //tutaj watek sie zatrzymuje oczekujac na polaczenie

  kprintf("http serv lev 5\n");

  if(pxNewConnection != NULL)
  {
   kprintf("http serv lev 6\n");
   /* Service connection. */
   vProcessConnection( pxNewConnection );
   while( netconn_delete( pxNewConnection ) != ERR_OK )
   {
    vTaskDelay( webSHORT_DELAY );
   }
  }
}
}

best regards

Janusz

From:	Janusz U.
Subject:	[lwip-users] tcp connection problem
Date:	Thu, 31 Aug 2006 14:58:42 +0200