ESP8266 Community Forum

- Tue Nov 03, 2015 6:22 am #32927 Hi all

i have embed a tiny dns in ESP8266 （using RTOS SDK）
but when runing the ESP8266， it was always put out something strange code to UART0

Code: Select all ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x40100000, len 30140, room 16
tail 12
chksum 0x6d
ho 0 tail 12 room 4
load 0x3ffe8000, len 1148, room 12
tail 0
chksum 0x10
load 0x3ffe8480, len 784, room 8
tail 8
chksum 0x89
csum 0x89
劽諄MEM CHECK FAIL!!!

my dns code is like below：

Code: Select all#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include  "Tinydns.h"
#include <lwip/sockets.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#define PORT 53
#define MSG_SIZE 256


void TinydnsTask(void *pvParameters)
{
   struct sockaddr_in addr, server;
   char *msg = (char *)malloc(MSG_SIZE);

     // socket creation
   int sd = socket(AF_INET, SOCK_DGRAM, 0);
   if (sd < 0) {
      //printf(stderr, "%s: cannot open socket \n", argv[0]);
      //return 1;
      asm("break 1,1");
   }
   printf("TinyDns open socket \n" );
   
   
     // bind local server port
   server.sin_family = AF_INET;
   server.sin_addr.s_addr = htonl(INADDR_ANY);
   server.sin_port = htons(PORT);
   int rc = bind(sd, (struct sockaddr *) &server, sizeof(server));
   if (rc < 0) {
      //fprintf(stderr,"%s: cannot bind port number %d \n", argv[0],PORT);
      //return 1;
      asm("break 1,1");
   }
   printf("TinyDns Bind socket \n");
   
   
   socklen_t len = sizeof(addr);
   int flags = 0;
   //int RxTimeout = 1000;
   while (1) {

      //int ret = setsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, &RxTimeout, sizeof(int));
     // receive message
      int n = recvfrom(sd, msg, MSG_SIZE, flags, (struct sockaddr*)&addr, &len);
      //int n = -1;
      //vTaskDelay(1000);
      if (n <= 0) {continue;}
      
      printf("TinyDns recive msg : %d byte from socket \n",n);
      
      // Same Id
      msg[2] = 0x81; msg[3] = 0x80; // Change Opcode and flags
      msg[6] = 0; msg[7] = 1; // One answer
      msg[8] = 0; msg[9] = 0; // NSCOUNT
      msg[10] = 0; msg[11] = 0; // ARCOUNT
     

      // Keep request in message and add answer
      msg[n++] = 0xC0; msg[n++] = 0x0C; // Offset to the domain name
      msg[n++] = 0x00; msg[n++] = 0x01; // Type 1
      msg[n++] = 0x00; msg[n++] = 0x01; // Class 1
      msg[n++] = 0x00; msg[n++] = 0x00; msg[n++] = 0x00; msg[n++] = 0x3c; // TTL
      msg[n++] = 0x00; msg[n++] = 0x04; // Size --> 4
      msg[n++] = 0x12; msg[n++] = 0x34; msg[n++] = 0x56; msg[n++] = 0x78; // IP
      // Send the answer
      sendto(sd, msg, n, flags, (struct sockaddr *)&addr, len);
      
      if (msg){
         free(msg);
         msg = NULL;
         printf("free msg \n");
      }
   }
   //return 0;
}


and i create a task in user_init() like that ：

Code: Select allxTaskCreate(TinydnsTask, (signed char *)"Mdns", 256, NULL, 2, NULL);

does anybody know what is wrong？？？？