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== Test Environments ==

{| class="smalldiv"
| style="background-color:#F6F9ED" |
| style="background-color:#F6F9ED" | Hardware Comments
| style="background-color:#F6F9ED" | '''Nut/OS 4.6.4'''
| style="background-color:#F6F9ED" | '''Nut/OS 4.7.4'''
| style="background-color:#F6F9ED" | '''Nut/OS 4.8.0'''
|-
| Ethernut 1.3 H
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut13H-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut13H-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut13H-nutos-4.8.0.zip '''Binaries''']
|-
| Ethernut 2.1 B
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut21B-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut21B-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut21B-nutos-4.8.0.zip '''Binaries''']
|-
| Ethernut 3.0 E
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut30E-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut30E-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-enut30E-nutos-4.8.0.zip '''Binaries''']
|-
| EIR 1.0 C
| Set jumper JP1 to UART mode.
| Configuration Error.
| Configuration Error.
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-editor-eir1c-nutos-4.8.0.zip '''Binaries'''] Sometimes ignores key strokes
|-
| id="compilertd" colspan="5" |'''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 ==

<source lang="c">
#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;
}
</source>

== 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 ==
* [[Network Configuration]] Overview
** [[Network Configuration Using Stored Configuration]]
** [[Network Configuration Using Hard Coded Configuration]]
** [[Discovery Service]]
* [[Basic TCP Server]]
* [[Basic TCP Client]]
* More [[Nut/OS Examples]]

= External Links =

[http://en.wikipedia.org/wiki/Mac_address MAC address] A Media Access Control address (MAC address) is a unique identifier assigned to network adapters for identification.

[http://en.wikipedia.org/wiki/Ip_address IP address] A numerical identification that is assigned to devices participating in a computer network utilizing the Internet Protocol.

[http://en.wikipedia.org/wiki/Dhcp Dynamic Host Configuration Protocol] A protocol used by networked devices to obtain the parameters necessary for operation in an Internet Protocol network.

[[Category:Code Snippets]]

{{Languages}}

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