getproto.c revision 288683 
1/*	$FreeBSD: head/contrib/ipfilter/lib/getproto.c 255332 2013-09-06 23:11:19Z cy $	*/
2
3/*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * $Id$
9 */
10
11#include "ipf.h"
12#include <ctype.h>
13
14int getproto(name)
15	char *name;
16{
17	struct protoent *p;
18	char *s;
19
20	for (s = name; *s != '\0'; s++)
21		if (!ISDIGIT(*s))
22			break;
23	if (*s == '\0')
24		return atoi(name);
25
26#ifdef _AIX51
27	/*
28	 * For some bogus reason, "ip" is 252 in /etc/protocols on AIX 5
29	 * The IANA has doubled up on the definition of 0 - it is now also
30	 * used for IPv6 hop-opts, so we can no longer rely on /etc/protocols
31	 * providing the correct name->number mapping
32	 */
33#endif
34	if (!strcasecmp(name, "ip"))
35		return 0;
36
37	p = getprotobyname(name);
38	if (p != NULL)
39		return p->p_proto;
40	return -1;
41}
42