xref: /illumos-gate/usr/src/cmd/ipf/lib/common/genmask.c (revision ab25eeb5)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * Copyright (C) 1993-2001 by Darren Reed.
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * See the IPFILTER.LICENCE file for details on licencing.
57c478bd9Sstevel@tonic-gate  *
6*ab25eeb5Syz  * $Id: genmask.c,v 1.7 2003/11/11 13:40:15 darrenr Exp $
77c478bd9Sstevel@tonic-gate  */
87c478bd9Sstevel@tonic-gate 
97c478bd9Sstevel@tonic-gate #include "ipf.h"
107c478bd9Sstevel@tonic-gate 
117c478bd9Sstevel@tonic-gate 
genmask(msk,mskp)127c478bd9Sstevel@tonic-gate int genmask(msk, mskp)
137c478bd9Sstevel@tonic-gate char *msk;
147c478bd9Sstevel@tonic-gate u_32_t *mskp;
157c478bd9Sstevel@tonic-gate {
167c478bd9Sstevel@tonic-gate 	char *endptr = 0L;
177c478bd9Sstevel@tonic-gate 	int bits;
187c478bd9Sstevel@tonic-gate 
197c478bd9Sstevel@tonic-gate 	if (strchr(msk, '.') || strchr(msk, 'x') || strchr(msk, ':')) {
207c478bd9Sstevel@tonic-gate 		/* possibly of the form xxx.xxx.xxx.xxx
217c478bd9Sstevel@tonic-gate 		 * or 0xYYYYYYYY */
227c478bd9Sstevel@tonic-gate #ifdef	USE_INET6
237c478bd9Sstevel@tonic-gate 		if (use_inet6) {
247c478bd9Sstevel@tonic-gate 			if (inet_pton(AF_INET6, msk, mskp) != 1)
257c478bd9Sstevel@tonic-gate 				return -1;
267c478bd9Sstevel@tonic-gate 		} else
277c478bd9Sstevel@tonic-gate #endif
287c478bd9Sstevel@tonic-gate 		if (inet_aton(msk, (struct in_addr *)mskp) == 0)
297c478bd9Sstevel@tonic-gate 			return -1;
307c478bd9Sstevel@tonic-gate 	} else {
317c478bd9Sstevel@tonic-gate 		/*
327c478bd9Sstevel@tonic-gate 		 * set x most significant bits
337c478bd9Sstevel@tonic-gate 		 */
347c478bd9Sstevel@tonic-gate 		bits = (int)strtol(msk, &endptr, 0);
357c478bd9Sstevel@tonic-gate #ifdef	USE_INET6
367c478bd9Sstevel@tonic-gate 		if ((*endptr != '\0') ||
377c478bd9Sstevel@tonic-gate 		    ((bits > 32) && !use_inet6) || (bits < 0) ||
387c478bd9Sstevel@tonic-gate 		    ((bits > 128) && use_inet6))
397c478bd9Sstevel@tonic-gate #else
407c478bd9Sstevel@tonic-gate 		if (*endptr != '\0' || bits > 32 || bits < 0)
417c478bd9Sstevel@tonic-gate #endif
427c478bd9Sstevel@tonic-gate 			return -1;
437c478bd9Sstevel@tonic-gate #ifdef	USE_INET6
447c478bd9Sstevel@tonic-gate 		if (use_inet6)
457c478bd9Sstevel@tonic-gate 			fill6bits(bits, mskp);
467c478bd9Sstevel@tonic-gate 		else
477c478bd9Sstevel@tonic-gate #endif
487c478bd9Sstevel@tonic-gate 		if (bits == 0)
497c478bd9Sstevel@tonic-gate 			*mskp = 0;
507c478bd9Sstevel@tonic-gate 		else
517c478bd9Sstevel@tonic-gate 			*mskp = htonl(0xffffffff << (32 - bits));
527c478bd9Sstevel@tonic-gate 	}
537c478bd9Sstevel@tonic-gate 	return 0;
547c478bd9Sstevel@tonic-gate }
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