1/*
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * Copyright (c) 2000 Ben Harris.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the project nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <stdint.h>
32#include <stdio.h>
33#include <netdb.h>
34#include <net/if_types.h>
35#include <net/if_dl.h>
36
37static int
38hexname(const uint8_t *cp, size_t len, char *host, size_t hostlen)
39{
40	int i, n;
41	char *outp = host;
42
43	*outp = '\0';
44	for (i = 0; i < len; i++)
45	{
46		n = snprintf(outp, hostlen, "%s%02x", i ? ":" : "", cp[i]);
47		if ((n < 0) || (n >= hostlen))
48		{
49			*host = '\0';
50			return EAI_MEMORY;
51		}
52
53		outp += n;
54		hostlen -= n;
55	}
56
57	return 0;
58}
59
60/*
61 * getnameinfo_link():
62 * Format a link-layer address into a printable format, paying attention to
63 * the interface type.
64 */
65__private_extern__ int
66getnameinfo_link(const struct sockaddr *sa, socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags)
67{
68	const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)(const void *)sa;
69	int n;
70
71	if (serv != NULL && servlen > 0) *serv = '\0';
72
73	if ((sdl->sdl_nlen == 0) && (sdl->sdl_alen == 0) && (sdl->sdl_slen == 0))
74	{
75		n = snprintf(host, hostlen, "link#%d", sdl->sdl_index);
76		if (n > hostlen)
77		{
78			*host = '\0';
79			return EAI_MEMORY;
80		}
81
82		return 0;
83	}
84
85	switch (sdl->sdl_type)
86	{
87			/*
88			 * The following have zero-length addresses.
89			 * IFT_ATM      (net/if_atmsubr.c)
90			 * IFT_FAITH    (net/if_faith.c)
91			 * IFT_GIF      (net/if_gif.c)
92			 * IFT_LOOP     (net/if_loop.c)
93			 * IFT_PPP      (net/if_ppp.c, net/if_spppsubr.c)
94			 * IFT_SLIP     (net/if_sl.c, net/if_strip.c)
95			 * IFT_STF      (net/if_stf.c)
96			 * IFT_L2VLAN   (net/if_vlan.c)
97			 * IFT_BRIDGE (net/if_bridge.h>
98			 */
99			/*
100			 * The following use IPv4 addresses as link-layer addresses:
101			 * IFT_OTHER    (net/if_gre.c)
102			 * IFT_OTHER    (netinet/ip_ipip.c)
103			 */
104			/* default below is believed correct for all these. */
105		case IFT_ARCNET:
106		case IFT_ETHER:
107		case IFT_FDDI:
108		case IFT_HIPPI:
109		case IFT_ISO88025:
110		default:
111			return hexname((uint8_t *)LLADDR(sdl), (size_t)sdl->sdl_alen, host, hostlen);
112	}
113
114	/* NOTREACHED */
115	return EAI_FAIL;
116}
117