[En-Nut-Discussion] ICMP Sockets

[Ralph Mason]

I have implemented ICMP sockets for NutOS if anyone is interested.

You can do tracert, ping etc.

You can also receive unreachable messages etc for a given TCP or UDP
connection.

Example code

int ping(char* args[],int argc, FILE* f){

	u_long addr;
	ICMPSOCKET* sock;
	u_char data[32];
	int i;

	if ( argc < 2 ){
		fputs_P(PSTR("usage: ping host [timeout]\r\n"),f);
		return -1;
	}

	if( (addr = resolve_address_name(args[1],f)) == 0 ){
		cr(f);
		return 0;
	}

	sock = NutIcmpCreateSocket(IPPROTO_ICMP,1);

	fprintf_P(f,PSTR("Pinging %s [%a] with 32 bytes\r\n\r\n"),args[1],addr);
	fflush(f);

	for( i = 0 ; i < 4 ; i++){
		u_long reply_addr;
		u_char type;
		u_char code;
		u_long ticks;

		NutIcmpSendTo(sock,addr,ICMP_ECHO,0,data,32);
		ticks = NutGetTickCount();

		if ( NutIcmpReceiveFrom(sock,&reply_addr,&type,&code,data,32,3000) != 0){

			switch( type){
				case ICMP_ECHOREPLY:
					fprintf_P(f,PSTR("Relpy from %a %i ms\r\n"),reply_addr,
							(int)(((NutGetTickCount()-ticks)*1000)/ 40L));
					break;

				default:
					fprintf_P(f,PSTR("Relpy from %a type %i code %i\r\n"),
							reply_addr,type,code);
				}
			}
			else{
				fputs_P(PSTR("Request timed out.\r\n"),f);
			}

			fflush(f);
	}

	NutIcmpDestroySocket(sock);

	return 0;
}



If you want the code reply via email.

Cheers
Ralph

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