1: /*
    2:  * ++Copyright++ 1985, 1988, 1993
    3:  * -
    4:  * Copyright (c) 1985, 1988, 1993
    5:  *    The Regents of the University of California.  All rights reserved.
    6:  *
    7:  * Redistribution and use in source and binary forms, with or without
    8:  * modification, are permitted provided that the following conditions
    9:  * are met:
   10:  * 1. Redistributions of source code must retain the above copyright
   11:  *    notice, this list of conditions and the following disclaimer.
   12:  * 2. Redistributions in binary form must reproduce the above copyright
   13:  *    notice, this list of conditions and the following disclaimer in the
   14:  *    documentation and/or other materials provided with the distribution.
   15:  * 4. Neither the name of the University nor the names of its contributors
   16:  *    may be used to endorse or promote products derived from this software
   17:  *    without specific prior written permission.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  * -
   31:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
   32:  *
   33:  * Permission to use, copy, modify, and distribute this software for any
   34:  * purpose with or without fee is hereby granted, provided that the above
   35:  * copyright notice and this permission notice appear in all copies, and that
   36:  * the name of Digital Equipment Corporation not be used in advertising or
   37:  * publicity pertaining to distribution of the document or software without
   38:  * specific, written prior permission.
   39:  *
   40:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
   41:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
   42:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
   43:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
   44:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
   45:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
   46:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
   47:  * SOFTWARE.
   48:  * -
   49:  * --Copyright--
   50:  */
   51: 
   52: #include <arpa/nameser.h>
   53: #include <sys/socket.h>
   54: 
   55: typedef union {
   56:     int32_t al;
   57:     char ac;
   58: } align;
   59: 
   60: static void
   61: map_v4v6_hostent (struct hostent *hp, char **bpp, int *lenp)
   62: {
   63:   char **ap;
   64: 
   65:   if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
   66:     return;
   67:   hp->h_addrtype = AF_INET6;
   68:   hp->h_length = IN6ADDRSZ;
   69:   for (ap = hp->h_addr_list; *ap; ap++)
   70:     {
   71:       int i = sizeof (align) - ((u_long) *bpp % sizeof (align));
   72: 
   73:       if (*lenp < (i + IN6ADDRSZ))
   74:         {
   75:           /* Out of memory.  Truncate address list here.  XXX */
   76:           *ap = NULL;
   77:           return;
   78:         }
   79:       *bpp += i;
   80:       *lenp -= i;
   81:       map_v4v6_address (*ap, *bpp);
   82:       *ap = *bpp;
   83:       *bpp += IN6ADDRSZ;
   84:       *lenp -= IN6ADDRSZ;
   85:     }
   86: }