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/*
* 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 <syslog.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/ioctl.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(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) {
return inet_ntop(AF_INET6, addr, buf, blen);
}
l = 0;
for (i=0; i<alen; i++) {
if (i==0) {
snprintf(buf+l, blen, "%02x", addr[i]);
blen -= 2;
l += 2;
} else {
snprintf(buf+l, blen, ":%02x", addr[i]);
blen -= 3;
l += 3;
}
}
return buf;
}

/*NB: lladdr is char * (rather than u8 *) because sa_data is char * (1003.1g) */
int ll_addr_a2n(char *lladdr, int len, 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;
}
}
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