/*

 * inet_proto.c

 *

 *		This program is free software; you can redistribute it and/or

 *		modify it under the terms of the GNU General Public License

 *		as published by the Free Software Foundation; either version

 *		2 of the License, or (at your option) any later version.

 *

 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>

 *

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <netdb.h>

#include <string.h>

#include "rt_names.h"

#include "utils.h"

const char *inet_proto_n2a(int proto, char *buf, int len)

{

	static char *ncache;

	static int icache = -1;

	struct protoent *pe;

	if (proto == icache)

		return ncache;

	pe = getprotobynumber(proto);

	if (pe && !numeric) {

		if (icache != -1)

			free(ncache);

		icache = proto;

		ncache = strdup(pe->p_name);

		strlcpy(buf, pe->p_name, len);

		return buf;

	}

	snprintf(buf, len, "ipproto-%d", proto);

	return buf;

}

int inet_proto_a2n(const char *buf)

{

	static char *ncache;

	static int icache = -1;

	struct protoent *pe;

	__u8 ret;

	if (icache != -1 && strcmp(ncache, buf) == 0)

		return icache;

	if (!get_u8(&ret, buf, 10))

		return ret;

	pe = getprotobyname(buf);

	if (pe) {

		if (icache != -1)

			free(ncache);

		icache = pe->p_proto;

		ncache = strdup(pe->p_name);

		return pe->p_proto;

	}

	return -1;

}