src/libfreeswan/anyaddr.c

   1 /*
   2  * special addresses
   3  * Copyright (C) 2000  Henry Spencer.
   4  *
   5  * This library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Library General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/lgpl.txt>.
   9  *
  10  * This library is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
  13  * License for more details.
  14  *
  15  * RCSID $Id: anyaddr.c,v 1.1 2004/03/15 20:35:25 as Exp $
  16  */
  17 #include "internal.h"
  18 #include "freeswan.h"
  19
  20 /* these are mostly fallbacks for the no-IPv6-support-in-library case */
  21 #ifndef IN6ADDR_ANY_INIT
  22 #define IN6ADDR_ANY_INIT        {{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }}
  23 #endif
  24 #ifndef IN6ADDR_LOOPBACK_INIT
  25 #define IN6ADDR_LOOPBACK_INIT   {{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }}
  26 #endif
  27
  28 static struct in6_addr v6any = IN6ADDR_ANY_INIT;
  29 static struct in6_addr v6loop = IN6ADDR_LOOPBACK_INIT;
  30
  31 /*
  32  - anyaddr - initialize to the any-address value
  33  */
  34 err_t                           /* NULL for success, else string literal */
  35 anyaddr(af, dst)
  36 int af;                         /* address family */
  37 ip_address *dst;
  38 {
  39         uint32_t v4any = htonl(INADDR_ANY);
  40
  41         switch (af) {
  42         case AF_INET:
  43                 return initaddr((unsigned char *)&v4any, sizeof(v4any), af, dst);
  44                 break;
  45         case AF_INET6:
  46                 return initaddr((unsigned char *)&v6any, sizeof(v6any), af, dst);
  47                 break;
  48         default:
  49                 return "unknown address family in anyaddr/unspecaddr";
  50                 break;
  51         }
  52 }
  53
  54 /*
  55  - unspecaddr - initialize to the unspecified-address value
  56  */
  57 err_t                           /* NULL for success, else string literal */
  58 unspecaddr(af, dst)
  59 int af;                         /* address family */
  60 ip_address *dst;
  61 {
  62         return anyaddr(af, dst);
  63 }
  64
  65 /*
  66  - loopbackaddr - initialize to the loopback-address value
  67  */
  68 err_t                           /* NULL for success, else string literal */
  69 loopbackaddr(af, dst)
  70 int af;                         /* address family */
  71 ip_address *dst;
  72 {
  73         uint32_t v4loop = htonl(INADDR_LOOPBACK);
  74
  75         switch (af) {
  76         case AF_INET:
  77                 return initaddr((unsigned char *)&v4loop, sizeof(v4loop), af, dst);
  78                 break;
  79         case AF_INET6:
  80                 return initaddr((unsigned char *)&v6loop, sizeof(v6loop), af, dst);
  81                 break;
  82         default:
  83                 return "unknown address family in loopbackaddr";
  84                 break;
  85         }
  86 }
  87
  88 /*
  89  - isanyaddr - test for the any-address value
  90  */
  91 int
  92 isanyaddr(src)
  93 const ip_address *src;
  94 {
  95         uint32_t v4any = htonl(INADDR_ANY);
  96         int cmp;
  97
  98         switch (src->u.v4.sin_family) {
  99         case AF_INET:
 100                 cmp = memcmp(&src->u.v4.sin_addr.s_addr, &v4any, sizeof(v4any));
 101                 break;
 102         case AF_INET6:
 103                 cmp = memcmp(&src->u.v6.sin6_addr, &v6any, sizeof(v6any));
 104                 break;
 105         default:
 106                 return 0;
 107                 break;
 108         }
 109
 110         return (cmp == 0) ? 1 : 0;
 111 }
 112
 113 /*
 114  - isunspecaddr - test for the unspecified-address value
 115  */
 116 int
 117 isunspecaddr(src)
 118 const ip_address *src;
 119 {
 120         return isanyaddr(src);
 121 }
 122
 123 /*
 124  - isloopbackaddr - test for the loopback-address value
 125  */
 126 int
 127 isloopbackaddr(src)
 128 const ip_address *src;
 129 {
 130         uint32_t v4loop = htonl(INADDR_LOOPBACK);
 131         int cmp;
 132
 133         switch (src->u.v4.sin_family) {
 134         case AF_INET:
 135                 cmp = memcmp(&src->u.v4.sin_addr.s_addr, &v4loop, sizeof(v4loop));
 136                 break;
 137         case AF_INET6:
 138                 cmp = memcmp(&src->u.v6.sin6_addr, &v6loop, sizeof(v6loop));
 139                 break;
 140         default:
 141                 return 0;
 142                 break;
 143         }
 144
 145         return (cmp == 0) ? 1 : 0;
 146 }