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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1999-2018 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
	7	* Reserved. This file contains Original Code and/or Modifications of
	8	* Original Code as defined in and that are subject to the Apple Public
	9	* Source License Version 1.1 (the "License"). You may not use this file
	10	* except in compliance with the License. Please obtain a copy of the
	11	* License at http://www.apple.com/publicsource and read it before using
	12	* this file.
	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the
	19	* License for the specific language governing rights and limitations
	20	* under the License.
	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24	#if !defined(lint) && defined(SCCSIDS)
	25	static char sccsid[] = "@(#)ether_addr.c 1.2 88/05/10 4.0NFSSRC; from 1.9 88/02/08 Copyr 1985 Sun Micro";
	26	#endif
	27
	28	/*
	29	* Copyright (c) 1985 by Sun Microsystems, Inc.
	30	*
	31	* All routines necessary to deal with the file /etc/ethers. The file
	32	* contains mappings from 48 bit ethernet addresses to their corresponding
	33	* hosts name. The addresses have an ascii representation of the form
	34	* "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff; the
	35	* bytes are always in network order.
	36	*/
	37	#include "libinfo_common.h"
	38
	39	#include <stdlib.h>
	40	#include <string.h>
	41	#include <stdio.h>
	42	#include <sys/types.h>
	43	#include <sys/socket.h>
	44	#include <net/if.h>
	45	#include <netinet/in.h>
	46	#include <netinet/if_ether.h>
	47
	48	/*
	49	* Parses a line from /etc/ethers into its components. The line has the form
	50	* 8:0:20:1:17:c8 krypton
	51	* where the first part is a 48 bit ethernet addrerss and the second is
	52	* the corresponding hosts name.
	53	* Returns zero if successful, non-zero otherwise.
	54	*/
	55	LIBINFO_EXPORT
	56	int
	57	ether_line(const char s, struct ether_addr e, char *hostname)
	58	{
	59	int i;
	60	unsigned int t[6];
	61
	62	i = sscanf(s, " %x:%x:%x:%x:%x:%x %s", &t[0], &t[1], &t[2], &t[3], &t[4], &t[5], hostname);
	63	if (i != 7) return (7 - i);
	64
	65	for (i = 0; i < 6; i++) e->ether_addr_octet[i] = t[i];
	66	return 0;
	67	}
	68
	69	/*
	70	* Converts a 48 bit ethernet number to its string representation.
	71	*/
	72	#define EI(i) (unsigned int)(e->ether_addr_octet[(i)])
	73	LIBINFO_EXPORT
	74	char *
	75	ether_ntoa(const struct ether_addr *e)
	76	{
	77	static char *s;
	78
	79	if (s == 0)
	80	{
	81	s = (char *)malloc(18);
	82	if (s == 0) return NULL;
	83	}
	84
	85	s[0] = 0;
	86	sprintf(s, "%x:%x:%x:%x:%x:%x", EI(0), EI(1), EI(2), EI(3), EI(4), EI(5));
	87	return s;
	88	}
	89
	90	/*
	91	* Converts a ethernet address representation back into its 48 bits.
	92	*/
	93	LIBINFO_EXPORT
	94	struct ether_addr *
	95	ether_aton(const char *s)
	96	{
	97	static struct ether_addr *ep;
	98	int i;
	99	unsigned int t[6];
	100
	101	if (ep == 0)
	102	{
	103	ep = (struct ether_addr *)calloc(1, sizeof (struct ether_addr));
	104	if (ep == 0) return NULL;
	105	}
	106
	107	i = sscanf(s, " %x:%x:%x:%x:%x:%x", &t[0], &t[1], &t[2], &t[3], &t[4], &t[5]);
	108	if (i != 6) return NULL;
	109
	110	for (i = 0; i < 6; i++) ep->ether_addr_octet[i] = t[i];
	111	return ep;
	112	}