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#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "lookup.h"

int __inet_aton(const char *, struct in_addr *);

int __lookup_ipliteral(struct address buf[static 1], const char *name, int family)
{
	struct in_addr a4;
	struct in6_addr a6;
	if (family != AF_INET6 && __inet_aton(name, &a4)>0) {
		memcpy(&buf[0].addr, &a4, sizeof a4);
		buf[0].family = AF_INET;
		buf[0].scopeid = 0;
		return 1;
	}
	if (family != AF_INET) {
		char tmp[64];
		char *p = strchr(name, '%'), *z;
		unsigned long long scopeid;
		if (p && p-name < 64) {
			memcpy(tmp, name, p-name);
			tmp[p-name] = 0;
			name = tmp;
		}
		if (inet_pton(AF_INET6, name, &a6)<=0) return 0;
		memcpy(&buf[0].addr, &a6, sizeof a6);
		buf[0].family = AF_INET6;
		if (p) {
			if (isdigit(*++p)) scopeid = strtoull(p, &z, 10);
			else z = p-1;
			if (*z) {
				if (!IN6_IS_ADDR_LINKLOCAL(&a6) &&
				    !IN6_IS_ADDR_MC_LINKLOCAL(&a6))
					return EAI_NONAME;
				scopeid = if_nametoindex(p);
				if (!scopeid) return EAI_NONAME;
			}
			if (scopeid > UINT_MAX) return EAI_NONAME;
			buf[0].scopeid = scopeid;
		}
		return 1;
	}
	return 0;
}