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ntp 4.2.6p5

    1: /*
    2:  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
    3:  * Copyright (C) 2002  Internet Software Consortium.
    4:  *
    5:  * Permission to use, copy, modify, and/or distribute this software for any
    6:  * purpose with or without fee is hereby granted, provided that the above
    7:  * copyright notice and this permission notice appear in all copies.
    8:  *
    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
   10:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
   11:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
   12:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
   13:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
   14:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
   15:  * PERFORMANCE OF THIS SOFTWARE.
   16:  */
   17: 
   18: /*! \file */
   19: 
   20: #if defined(LIBC_SCCS) && !defined(lint)
   21: static char rcsid[] =
   22: 	"$Id: netscope.c,v 1.1.1.1 2012/05/29 12:08:38 misho Exp $";
   23: #endif /* LIBC_SCCS and not lint */
   24: 
   25: #include <config.h>
   26: 
   27: #include <isc/string.h>
   28: #include <isc/net.h>
   29: #include <isc/netscope.h>
   30: #include <isc/result.h>
   31: 
   32: isc_result_t
   33: isc_netscope_pton(int af, char *scopename, void *addr, isc_uint32_t *zoneid) {
   34: 	char *ep;
   35: #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
   36: 	unsigned int ifid;
   37: #endif
   38: 	struct in6_addr *in6;
   39: 	isc_uint32_t zone;
   40: 	isc_uint64_t llz;
   41: 
   42: 	/* at this moment, we only support AF_INET6 */
   43: 	if (af != AF_INET6)
   44: 		return (ISC_R_FAILURE);
   45: 
   46: 	in6 = (struct in6_addr *)addr;
   47: 
   48: 	/*
   49: 	 * Basically, "names" are more stable than numeric IDs in terms of
   50: 	 * renumbering, and are more preferred.  However, since there is no
   51: 	 * standard naming convention and APIs to deal with the names.  Thus,
   52: 	 * we only handle the case of link-local addresses, for which we use
   53: 	 * interface names as link names, assuming one to one mapping between
   54: 	 * interfaces and links.
   55: 	 */
   56: #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
   57: 	if (IN6_IS_ADDR_LINKLOCAL(in6) &&
   58: 	    (ifid = if_nametoindex((const char *)scopename)) != 0)
   59: 		zone = (isc_uint32_t)ifid;
   60: 	else {
   61: #endif
   62: 		llz = isc_string_touint64(scopename, &ep, 10);
   63: 		if (ep == scopename)
   64: 			return (ISC_R_FAILURE);
   65: 
   66: 		/* check overflow */
   67: 		zone = (isc_uint32_t)(llz & 0xffffffffUL);
   68: 		if (zone != llz)
   69: 			return (ISC_R_FAILURE);
   70: #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
   71: 	}
   72: #endif
   73: 
   74: 	*zoneid = zone;
   75: 	return (ISC_R_SUCCESS);
   76: }