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
ll_addr_n2a(const unsigned char * addr,int alen,int type,char * buf,int blen)32 const char *ll_addr_n2a(const 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) */
ll_addr_a2n(char * lladdr,int len,const char * arg)60 int ll_addr_a2n(char *lladdr, int len, const 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 }
98