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