/*
* Copyright 1996 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $ANA: addr2ascii.c,v 1.1 1996/06/13 18:41:46 wollman Exp $
*
* $Id$
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <string.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
/*-
* Convert a network address from binary to printable numeric format.
* This API is copied from INRIA's IPv6 implementation, but it is a
* bit bogus in two ways:
*
* 1) There is no value in passing both an address family and
* an address length; either one should imply the other,
* or we should be passing sockaddrs instead.
* 2) There should by contrast be /added/ a length for the buffer
* that we pass in, so that programmers are spared the need to
* manually calculate (read: ``guess'') the maximum length.
*
* Flash: the API is also the same in the NRL implementation, and seems to
* be some sort of standard, so we appear to be stuck with both the bad
* naming and the poor choice of arguments.
*/
char *
addr2ascii(af, addrp, len, buf)
int af;
const void *addrp;
int len; /* should be size_t XXX */
char *buf; /* XXX should pass length of buffer */
{
static char staticbuf[64]; /* 64 for AF_LINK > 16 for AF_INET */
if (!buf)
buf = staticbuf;
switch(af) {
case AF_INET:
if (len != sizeof(struct in_addr)) {
errno = ENAMETOOLONG;
return 0;
}
strcpy(buf, inet_ntoa(*(const struct in_addr *)addrp));
break;
case AF_LINK:
if (len != sizeof(struct sockaddr_dl)) {
errno = ENAMETOOLONG;
return 0;
}
strcpy(buf, link_ntoa((const struct sockaddr_dl *)addrp));
break;
default:
errno = EPROTONOSUPPORT;
return 0;
}
return buf;
}
