/*

 * ll_addr.c

 *

 *		This program is free software; you can redistribute it and/or

 *		modify it under the terms of the GNU General Public License

 *		as published by the Free Software Foundation; either version

 *		2 of the License, or (at your option) any later version.

 *

 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <string.h>

#include <linux/netdevice.h>

#include <linux/if_arp.h>

#include <linux/sockios.h>

#include "rt_names.h"

#include "utils.h"

const char *ll_addr_n2a(const unsigned char *addr, int alen, int type,

			char *buf, int blen)

{

	int i;

	int l;

	if (alen == 4 &&

	    (type == ARPHRD_TUNNEL || type == ARPHRD_SIT

	     || type == ARPHRD_IPGRE))

		return inet_ntop(AF_INET, addr, buf, blen);

	if (alen == 16 && (type == ARPHRD_TUNNEL6 || type == ARPHRD_IP6GRE))

		return inet_ntop(AF_INET6, addr, buf, blen);

	snprintf(buf, blen, "%02x", addr[0]);

	for (i = 1, l = 2; i < alen && l < blen; i++, l += 3)

		snprintf(buf + l, blen - l, ":%02x", addr[i]);

	return buf;

}

/*NB: lladdr is char * (rather than u8 *) because sa_data is char * (1003.1g) */

int ll_addr_a2n(char *lladdr, int len, const char *arg)

{

	if (strchr(arg, '.')) {

		inet_prefix pfx;

		if (get_addr_1(&pfx, arg, AF_INET)) {

			fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);

			return -1;

		}

		if (len < 4)

			return -1;

		memcpy(lladdr, pfx.data, 4);

		return 4;

	} else {

		int i;

		for (i = 0; i < len; i++) {

			int temp;

			char *cp = strchr(arg, ':');

			if (cp) {

				*cp = 0;

				cp++;

			}

			if (sscanf(arg, "%x", &temp) != 1) {

				fprintf(stderr, "\"%s\" is invalid lladdr.\n",

					arg);

				return -1;

			}

			if (temp < 0 || temp > 255) {

				fprintf(stderr, "\"%s\" is invalid lladdr.\n",

					arg);

				return -1;

			}

			lladdr[i] = temp;

			if (!cp)

				break;

			arg = cp;

		}

		return i + 1;

	}

}