1/*
2 * inet_proto.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
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <sys/socket.h>
19#include <netinet/in.h>
20#include <netdb.h>
21#include <string.h>
22
23#include "rt_names.h"
24#include "utils.h"
25
26const char *inet_proto_n2a(int proto, char *buf, int len)
27{
28	static char ncache[16];
29	static int icache = -1;
30	struct protoent *pe;
31
32	if (proto == icache)
33		return ncache;
34
35	pe = getprotobynumber(proto);
36	if (pe) {
37		icache = proto;
38		strncpy(ncache, pe->p_name, 16);
39		strncpy(buf, pe->p_name, len);
40		return buf;
41	}
42	snprintf(buf, len, "ipproto-%d", proto);
43	return buf;
44}
45
46int inet_proto_a2n(const char *buf)
47{
48	static char ncache[16];
49	static int icache = -1;
50	struct protoent *pe;
51
52	if (icache>=0 && strcmp(ncache, buf) == 0)
53		return icache;
54
55	if (buf[0] >= '0' && buf[0] <= '9') {
56		__u8 ret;
57		if (get_u8(&ret, buf, 10))
58			return -1;
59		return ret;
60	}
61
62	pe = getprotobyname(buf);
63	if (pe) {
64		icache = pe->p_proto;
65		strncpy(ncache, pe->p_name, 16);
66		return pe->p_proto;
67	}
68	return -1;
69}
70
71
72