Network Configuration Using a Configuration Editor

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Contents

Test Environments

Hardware
Comments 		Nut/OS
4.6.4 		Nut/OS
4.7.4 		Nut/OS
4.8.0
Ethernut 1.3 H OK
Binaries 		OK
Binaries 		OK
Binaries
Ethernut 2.1 B OK
Binaries 		OK
Binaries 		OK
Binaries
Ethernut 3.0 E OK
Binaries 		OK
Binaries 		OK
Binaries
EIR 1.0 C Set jumper JP1 to UART mode. Configuration
Error. 		Configuration
Error. 		OK
Binaries
Sometimes ignores key strokes
Compiler: ARM-GCC 4.2.2 ; AVR-GCC 4.3.0

Description

The following application is a simple editor, which allows to modify the network configuration stored in non-volatile memory.

Source Code 

#include <dev/board.h>
#include <sys/confnet.h>
 
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include <io.h>
#include <arpa/inet.h>
#include <netinet/if_ether.h>
 
/* Reads line from standard input. */
static int EditLine(char *prompt, char *line, int siz)
{
    int ch;
    int pos = strlen(line);
 
    printf("%s: %s", prompt, line);
    for (;;) {
        ch = getchar();
        if (ch == 8) {
            if (pos) {
                pos--;
                printf("\b \b");
            }
        }
        else if (ch < ' ') {
            break;
        }
        else if (pos + 1 < siz) {
            putchar(ch);
            line[pos++] = ch;
        }
        else {
            putchar('\a');
        }
    }
    line[pos] = 0;
    putchar('\n');
 
    return 0;
}
 
/* Editor main routine. */
int main(void)
{
    u_long baud = 115200;
    char buf[32];
    uint8_t *cp;
    uint32_t addr;
    char ch;
 
    /* Assign stdin and stdout to the default UART device. */
    NutRegisterDevice(&DEV_UART, 0, 0);
    freopen(DEV_UART_NAME, "w", stdout);
    freopen(DEV_UART_NAME, "r", stdin);    
    _ioctl(_fileno(stdout), UART_SETSPEED, &baud);
    puts("Network Configuration Editor");
 
    for (;;) {
        /* Load configuration. */
        if (NutNetLoadConfig(DEV_ETHER_NAME)) {
            puts("\nNo configuration available");
            memcpy(confnet.cd_name, DEV_ETHER_NAME, sizeof(confnet.cd_name));
        } else {
            puts("\nConfiguration loaded");
        }
 
        /* Edit MAC address. */
        do {
            strcpy(buf, ether_ntoa(confnet.cdn_mac));
            EditLine("MAC Address", buf, 18);
            cp = ether_aton(buf);
        } while (cp == NULL);
        memcpy(confnet.cdn_mac, cp, 6);
 
        /* Edit IP address. */
        do {
            strcpy(buf, inet_ntoa(confnet.cdn_cip_addr));
            EditLine("IP Address", buf, 16);
            addr = inet_addr(buf);
        } while (addr == -1);
        confnet.cdn_cip_addr = addr;
 
        /* Edit IP mask. */
        do {
            strcpy(buf, inet_ntoa(confnet.cdn_ip_mask));
            EditLine("IP Mask", buf, 16);
            addr = inet_addr(buf);
        } while (addr == -1);
        confnet.cdn_ip_mask = addr;
 
        /* Edit IP gate. */
        do {
            strcpy(buf, inet_ntoa(confnet.cdn_gateway));
            EditLine("IP Gate", buf, 16);
            addr = inet_addr(buf);
        } while (addr == -1);
        confnet.cdn_gateway = addr;
 
        /* Prompt for saving. */
        printf("\nPress S to save this configuration ");
 
        /* Flush input buffer and read next character. */
        while (kbhit()) {
            ch = getchar();
        }
        ch = getchar();
 
        /* Save or discard edited configuration. */
        if (ch == 's' || ch == 'S') {
            if (NutNetSaveConfig()) {
                puts("Failed");
            } else {
                puts("Saved");
            }
        } else {
            puts("Discarded");
        }
    }
    return 0;
}

Output 

Network Configuration Editor
 
Configuration loaded
MAC Address: 00:06:98:30:02:76
IP Address: 192.168.192.111
IP Mask: 255.255.255.0
IP Mask: 0.0.0.0
 
Press S to save this configuration Saved

Now you can try it out by executing Network Configuration Using Stored Configuration.

See also

External Links

MAC address A Media Access Control address (MAC address) is a unique identifier assigned to network adapters for identification.

IP address A numerical identification that is assigned to devices participating in a computer network utilizing the Internet Protocol.

Dynamic Host Configuration Protocol A protocol used by networked devices to obtain the parameters necessary for operation in an Internet Protocol network.

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