1 /*
2 * ll_addr.c
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 */
11
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <unistd.h>
15 #include <syslog.h>
16 #include <fcntl.h>
17 #include <sys/ioctl.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
21 #include <string.h>
22
23 #include <linux/netdevice.h>
24 #include <linux/if_arp.h>
25 #include <linux/sockios.h>
26
27 #include "rt_names.h"
28 #include "utils.h"
29
30
ll_addr_n2a(const unsigned char * addr,int alen,int type,char * buf,int blen)31 const char *ll_addr_n2a(const unsigned char *addr, int alen, int type, char *buf, int blen)
32 {
33 int i;
34 int l;
35
36 if (alen == 4 &&
37 (type == ARPHRD_TUNNEL || type == ARPHRD_SIT || type == ARPHRD_IPGRE)) {
38 return inet_ntop(AF_INET, addr, buf, blen);
39 }
40 if (alen == 16 && type == ARPHRD_TUNNEL6) {
41 return inet_ntop(AF_INET6, addr, buf, blen);
42 }
43 snprintf(buf, blen, "%02x", addr[0]);
44 for (i = 1, l = 2; i < alen && l < blen; i++, l += 3)
45 snprintf(buf + l, blen - l, ":%02x", addr[i]);
46 return buf;
47 }
48
49 /*NB: lladdr is char * (rather than u8 *) because sa_data is char * (1003.1g) */
ll_addr_a2n(char * lladdr,int len,const char * arg)50 int ll_addr_a2n(char *lladdr, int len, const char *arg)
51 {
52 if (strchr(arg, '.')) {
53 inet_prefix pfx;
54 if (get_addr_1(&pfx, arg, AF_INET)) {
55 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
56 return -1;
57 }
58 if (len < 4)
59 return -1;
60 memcpy(lladdr, pfx.data, 4);
61 return 4;
62 } else {
63 int i;
64
65 for (i=0; i<len; i++) {
66 int temp;
67 char *cp = strchr(arg, ':');
68 if (cp) {
69 *cp = 0;
70 cp++;
71 }
72 if (sscanf(arg, "%x", &temp) != 1) {
73 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
74 return -1;
75 }
76 if (temp < 0 || temp > 255) {
77 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
78 return -1;
79 }
80 lladdr[i] = temp;
81 if (!cp)
82 break;
83 arg = cp;
84 }
85 return i+1;
86 }
87 }
88