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/*

 * 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 $

 *

 *  addr2ascii.c,v 1.2 1998/08/20 21:56:23 joel Exp

 */

#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;

}