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Commit	Line	Data
9385eb3d A	1	/*
	2	* Copyright 1996 Massachusetts Institute of Technology
	3	*
	4	* Permission to use, copy, modify, and distribute this software and
	5	* its documentation for any purpose and without fee is hereby
	6	* granted, provided that both the above copyright notice and this
	7	* permission notice appear in all copies, that both the above
	8	* copyright notice and this permission notice appear in all
	9	* supporting documentation, and that the name of M.I.T. not be used
	10	* in advertising or publicity pertaining to distribution of the
	11	* software without specific, written prior permission. M.I.T. makes
	12	* no representations about the suitability of this software for any
	13	* purpose. It is provided "as is" without express or implied
	14	* warranty.
	15	*
	16	* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
	17	* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
	18	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	19	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
	20	* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	21	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	22	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	23	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	24	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	25	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	26	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*
	29	* $ANA: addr2ascii.c,v 1.1 1996/06/13 18:41:46 wollman Exp $
	30	*/
	31
	32	#include <sys/cdefs.h>
	33	__FBSDID("$FreeBSD: src/lib/libc/net/addr2ascii.c,v 1.2 2002/03/22 21:52:28 obrien Exp $");
	34
	35	#include <sys/types.h>
	36	#include <sys/socket.h>
	37
	38	#include <errno.h>
	39	#include <string.h>
	40
	41	#include <net/if_dl.h>
	42	#include <netinet/in.h>
	43	#include <arpa/inet.h>
	44
6465356a A	45	#include <stdlib.h>
6465356a A	46
9385eb3d A	47	/*-
	48	* Convert a network address from binary to printable numeric format.
	49	* This API is copied from INRIA's IPv6 implementation, but it is a
	50	* bit bogus in two ways:
	51	*
	52	* 1) There is no value in passing both an address family and
	53	* an address length; either one should imply the other,
	54	* or we should be passing sockaddrs instead.
	55	* 2) There should by contrast be /added/ a length for the buffer
	56	* that we pass in, so that programmers are spared the need to
	57	* manually calculate (read: ``guess'') the maximum length.
	58	*
	59	* Flash: the API is also the same in the NRL implementation, and seems to
	60	* be some sort of standard, so we appear to be stuck with both the bad
	61	* naming and the poor choice of arguments.
	62	*/
	63	char *
6465356a	64	addr2ascii(int af, const void addrp, int len, char buf)
9385eb3d	65	{
6465356a A	66	if (buf == NULL) {
	67	static char *staticbuf = NULL;
	68
	69	if (staticbuf == NULL) {
	70	staticbuf = malloc(64); // 64 for AF_LINK > 16 for AF_INET
	71	if (staticbuf == NULL) {
	72	return NULL;
	73	}
	74	}
	75
9385eb3d	76	buf = staticbuf;
6465356a	77	}
9385eb3d A	78
	79	switch(af) {
	80	case AF_INET:
	81	if (len != sizeof(struct in_addr)) {
	82	errno = ENAMETOOLONG;
	83	return 0;
	84	}
	85	strcpy(buf, inet_ntoa((const struct in_addr )addrp));
	86	break;
	87
	88	case AF_LINK:
	89	if (len != sizeof(struct sockaddr_dl)) {
	90	errno = ENAMETOOLONG;
	91	return 0;
	92	}
	93	strcpy(buf, link_ntoa((const struct sockaddr_dl *)addrp));
	94	break;
	95
	96	default:
	97	errno = EPROTONOSUPPORT;
	98	return 0;
	99	}
	100	return buf;
	101	}