1#include <sys/socket.h>
 2#include <netinet/in.h>
 3#include <netdb.h>
 4#include <net/if.h>
 5#include <arpa/inet.h>
 6#include <limits.h>
 7#include <stdlib.h>
 8#include <string.h>
 9#include <ctype.h>
10#include "lookup.h"
11
12int __lookup_ipliteral(struct address buf[static 1], const char *name, int family)
13{
14	struct in_addr a4;
15	struct in6_addr a6;
16	if (__inet_aton(name, &a4) > 0) {
17		if (family == AF_INET6) /* wrong family */
18			return EAI_NODATA;
19		memcpy(&buf[0].addr, &a4, sizeof a4);
20		buf[0].family = AF_INET;
21		buf[0].scopeid = 0;
22		return 1;
23	}
24
25	char tmp[64];
26	char *p = strchr(name, '%'), *z;
27	unsigned long long scopeid = 0;
28	if (p && p-name < 64) {
29		memcpy(tmp, name, p-name);
30		tmp[p-name] = 0;
31		name = tmp;
32	}
33
34	if (inet_pton(AF_INET6, name, &a6) <= 0)
35		return 0;
36	if (family == AF_INET) /* wrong family */
37		return EAI_NODATA;
38
39	memcpy(&buf[0].addr, &a6, sizeof a6);
40	buf[0].family = AF_INET6;
41	if (p) {
42		if (isdigit(*++p)) scopeid = strtoull(p, &z, 10);
43		else z = p-1;
44		if (*z) {
45			if (!IN6_IS_ADDR_LINKLOCAL(&a6) &&
46			    !IN6_IS_ADDR_MC_LINKLOCAL(&a6))
47				return EAI_NONAME;
48			scopeid = if_nametoindex(p);
49			if (!scopeid) return EAI_NONAME;
50		}
51		if (scopeid > UINT_MAX) return EAI_NONAME;
52	}
53	buf[0].scopeid = scopeid;
54	return 1;
55}