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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 <sys/ioctl.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
22 #include <string.h>
23
24 #include <linux/netdevice.h>
25 #include <linux/if_arp.h>
26 #include <linux/sockios.h>
27
28 #include "rt_names.h"
29 #include "utils.h"
30
31
32 const char *ll_addr_n2a(unsigned char *addr, int alen, int type, char *buf, int blen)
33 {
34         int i;
35         int l;
36
37         if (alen == 4 &&
38             (type == ARPHRD_TUNNEL || type == ARPHRD_SIT || type == ARPHRD_IPGRE)) {
39                 return inet_ntop(AF_INET, addr, buf, blen);
40         }
41         if (alen == 16 && type == ARPHRD_TUNNEL6) {
42                 return inet_ntop(AF_INET6, addr, buf, blen);
43         }
44         l = 0;
45         for (i=0; i<alen; i++) {
46                 if (i==0) {
47                         snprintf(buf+l, blen, "%02x", addr[i]);
48                         blen -= 2;
49                         l += 2;
50                 } else {
51                         snprintf(buf+l, blen, ":%02x", addr[i]);
52                         blen -= 3;
53                         l += 3;
54                 }
55         }
56         return buf;
57 }
58
59 /*NB: lladdr is char * (rather than u8 *) because sa_data is char * (1003.1g) */
60 int ll_addr_a2n(char *lladdr, int len, char *arg)
61 {
62         if (strchr(arg, '.')) {
63                 inet_prefix pfx;
64                 if (get_addr_1(&pfx, arg, AF_INET)) {
65                         fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
66                         return -1;
67                 }
68                 if (len < 4)
69                         return -1;
70                 memcpy(lladdr, pfx.data, 4);
71                 return 4;
72         } else {
73                 int i;
74
75                 for (i=0; i<len; i++) {
76                         int temp;
77                         char *cp = strchr(arg, ':');
78                         if (cp) {
79                                 *cp = 0;
80                                 cp++;
81                         }
82                         if (sscanf(arg, "%x", &temp) != 1) {
83                                 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
84                                 return -1;
85                         }
86                         if (temp < 0 || temp > 255) {
87                                 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
88                                 return -1;
89                         }
90                         lladdr[i] = temp;
91                         if (!cp)
92                                 break;
93                         arg = cp;
94                 }
95                 return i+1;
96         }
97 }