network_utilities.c

来自「91c111芯片的网络模块的原理图以及和ep1c6fpga连线相关的例子程序」· C语言 代码 · 共 482 行 · 第 1/2 页

  }
#else
  ret_code = ERR_IF;

  perror( "Not an Altera board.\n");
  perror( "You need to modify the function get_mac_addr() \n");
  perror( "to set a MAC address for your board");
#endif /* (Altera Nios Dev board definition) */

  return ret_code;
}

/*
 * get_ip_addr()
 * 
 * This routine is called by LWIP to obtain an IP address for the specified 
 * network adapter. Like the MAC address, obtaining an IP address is very
 * system-dependant and therefore this function is exported for the developer
 * to control.
 * 
 * In our system, we are either attempting DHCP auto-negotiation of IP address,
 * or we are setting our own static IP, Gateway, and Subnet Mask addresses our
 * self. This routine is where that happens.
 */
int get_ip_addr(alt_lwip_dev* lwip_dev, struct ip_addr* ipaddr, 
                struct ip_addr* netmask, struct ip_addr* gw,
                int* use_dhcp)
{
  int ret_code = 0;


  if (!strcmp(lwip_dev->name, "/dev/" LWIP_DEFAULT_IF))
  {
#if LWIP_DHCP == 1
    *use_dhcp = 1;

    /*
     * If we are telling LWIP to attempt DHCP, all that is needed is to save 
     * the the LWIP device in question to a the global netif "adapter"; the 
     * DHCP timeout task will then querry this device to see whether an IP
     * address has been set.
     * 
     * If we are not attempting DHCP, static network settings are assigned here
     * and we go on our merry way.
     */
    adapter = lwip_dev->netif;

#ifdef LCD_DISPLAY_NAME  
    /* Clear the LCD screen */
    fprintf(lcdDevice, "\x1b");
    fprintf(lcdDevice, "[2J");
    fprintf(lcdDevice, "Using DHCP to\nfind IP Addr");
#endif /* LCD_DISPLAY_NAME */
    printf("Using DHCP to find an IP Address\n");

#else
    IP4_ADDR(ipaddr, IPADDR0,IPADDR1,IPADDR2,IPADDR3);
    IP4_ADDR(gw, GWADDR0,GWADDR1,GWADDR2,GWADDR3);
    IP4_ADDR(netmask, MSKADDR0,MSKADDR1,MSKADDR2,MSKADDR3);
    *use_dhcp = 0;

    printf("Static IP Address is %d.%d.%d.%d\n", 
        ip4_addr1(ipaddr),
        ip4_addr2(ipaddr),
        ip4_addr3(ipaddr),
        ip4_addr4(ipaddr));

#ifdef LCD_DISPLAY_NAME  
      /* Clear the LCD screen */
      fprintf(lcdDevice, "\x1b");
      fprintf(lcdDevice, "[2J");
      fprintf(lcdDevice, "Static IP Addr\n %d.%d.%d.%d",
        ip4_addr1(ipaddr),
        ip4_addr2(ipaddr),
        ip4_addr3(ipaddr),
        ip4_addr4(ipaddr));
#endif /* LCD_DISPLAY_NAME */

#endif /* LWIP_DHCP */



    ret_code = 1;
  }

  return ret_code;
}

/*
 * dhcp_timeout_task()
 * 
 * This LWIP-called routine is responsible for checking to see whether DHCP 
 * was sucessful. Here we check to see whether a timeout (120 seconds in this
 * case) has elapsed. If so, display an error, assign a static address, and 
 * bail out. If not, continue checking for DHCP success and bail out once
 * a DHCP address assignment is complete.
 * 
 * This routine also displays the assigned IP address to the user (via STDOUT 
 * and, if equipped, LCD screen.
 * 
 * Note: LCD_DISPLAY_NAME is defined in user.h to be the LCD interface for
 *       the "standard" example design.
 */
#if LWIP_DHCP == 1
void dhcp_timeout_task()
{
  int have_address = 0, timeout_dhcp = 0;
  struct ip_addr ipaddr, netmask, gw;
  INT8U return_code = OS_NO_ERR;
 
#ifdef LCD_DISPLAY_NAME
  lcd_sem = OSSemCreate(1);
#endif /* LCD_DISPLAY_NAME */

  OSSemPend(attained_ip_address_sem, 0, &return_code);
  
#ifdef LCD_DISPLAY_NAME
  OSSemPend(lcd_sem, 0, &return_code);
#endif /* LCD_DISPLAY_NAME */
  
#ifdef LCD_DISPLAY_NAME 
  lcdDevice = fopen(LCD_DISPLAY_NAME, "w");
#endif /* LCD_DISPLAY_NAME */

  while(1)
  {
    OSTimeDlyHMSM(0,0,0,100);

    /* 
     * For demo purposes we need to use DHCP to allocate an IP Address
     * and LWIP had no mechanism to tell us one is allocated. Wait two 
     * minutes if we don't have one we use a static IP address
     */
    if((timeout_dhcp < DHCP_TIMEOUT) && (have_address == 0))
    {
      timeout_dhcp++;
      if (!ip_addr_isany(&adapter->ip_addr))
      {
        have_address = 1;
        printf("Assigned IP Address is %d.%d.%d.%d\n\n",
                ip4_addr1(&adapter->ip_addr),
                ip4_addr2(&adapter->ip_addr),
                ip4_addr3(&adapter->ip_addr),
                ip4_addr4(&adapter->ip_addr));

#ifdef LCD_DISPLAY_NAME        
        /* Clear screen */
        fprintf(lcdDevice, "\x1b");
        fprintf(lcdDevice, "[2J");
        fprintf(lcdDevice, "DHCP IP Addr is \n %d.%d.%d.%d",
                ip4_addr1(&adapter->ip_addr),
                ip4_addr2(&adapter->ip_addr),
                ip4_addr3(&adapter->ip_addr),
                ip4_addr4(&adapter->ip_addr));
#endif /* LCD_DISPLAY_NAME */
      }
    }
    /*
     * You're in a bit of trouble if this happens, you could assign a static
     * IP address but how do we choose it?
     */
    if (timeout_dhcp ==  DHCP_TIMEOUT)
    {
      dhcp_stop(adapter);
      IP4_ADDR(&ipaddr, IPADDR0,IPADDR1,IPADDR2,IPADDR3);
      IP4_ADDR(&gw, GWADDR0,GWADDR1,GWADDR2,GWADDR3);
      IP4_ADDR(&netmask, MSKADDR0,MSKADDR1,MSKADDR2,MSKADDR3);
      
      netif_set_addr( adapter,&ipaddr, &netmask, &gw);
      netif_set_up(adapter);
      
      printf("DHCP Failed to assign an IP Address\n\n"); 
      printf("\nUsing static address: %d.%d.%d.%d\n\n\n",
        ip4_addr1(&adapter->ip_addr),
        ip4_addr2(&adapter->ip_addr),
        ip4_addr3(&adapter->ip_addr),
        ip4_addr4(&adapter->ip_addr));

#ifdef LCD_DISPLAY_NAME  
      /* Clear the LCD screen */
      fprintf(lcdDevice, "\x1b");
      fprintf(lcdDevice, "[2J");
      fprintf(lcdDevice, "DHCP Failed using\n %d.%d.%d.%d",
        ip4_addr1(&adapter->ip_addr),
        ip4_addr2(&adapter->ip_addr),
        ip4_addr3(&adapter->ip_addr),
        ip4_addr4(&adapter->ip_addr));
#endif /* LCD_DISPLAY_NAME */
      have_address = 1;
    }
    
    if (have_address == 1)
    {
      /* 
       * We have an IP address this task has served it's purpose - kill it.
       */
#ifdef LCD_DISPLAY_NAME        
       fclose(lcdDevice);
#endif /* LCD_DISPLAY_NAME */
       OSSemPost(attained_ip_address_sem);
#ifdef LCD_DISPLAY_NAME        
       OSSemPost(lcd_sem);
#endif /* LCD_DISPLAY_NAME */
       OSTaskDel(OS_PRIO_SELF);
    }
  }
}
#endif /* LWIP_DHCP */


/******************************************************************************
*                                                                             *
* License Agreement                                                           *
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