src/libfreeswan/addrtypeof.c

   1 /*
   2  * extract parts of an ip_address
   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: addrtypeof.c,v 1.1 2004/03/15 20:35:25 as Exp $
  16  */
  17 #include "internal.h"
  18 #include "freeswan.h"
  19
  20 /*
  21  - addrtypeof - get the type of an ip_address
  22  */
  23 int
  24 addrtypeof(src)
  25 const ip_address *src;
  26 {
  27         return src->u.v4.sin_family;
  28 }
  29
  30 /*
  31  - addrbytesptr - get pointer to the address bytes of an ip_address
  32  */
  33 size_t                          /* 0 for error */
  34 addrbytesptr(src, dstp)
  35 const ip_address *src;
  36 const unsigned char **dstp;     /* NULL means just a size query */
  37 {
  38         const unsigned char *p;
  39         size_t n;
  40
  41         switch (src->u.v4.sin_family) {
  42         case AF_INET:
  43                 p = (const unsigned char *)&src->u.v4.sin_addr.s_addr;
  44                 n = 4;
  45                 break;
  46         case AF_INET6:
  47                 p = (const unsigned char *)&src->u.v6.sin6_addr;
  48                 n = 16;
  49                 break;
  50         default:
  51                 return 0;
  52                 break;
  53         }
  54
  55         if (dstp != NULL)
  56                 *dstp = p;
  57         return n;
  58 }
  59
  60 /*
  61  - addrlenof - get length of the address bytes of an ip_address
  62  */
  63 size_t                          /* 0 for error */
  64 addrlenof(src)
  65 const ip_address *src;
  66 {
  67         return addrbytesptr(src, NULL);
  68 }
  69
  70 /*
  71  - addrbytesof - get the address bytes of an ip_address
  72  */
  73 size_t                          /* 0 for error */
  74 addrbytesof(src, dst, dstlen)
  75 const ip_address *src;
  76 unsigned char *dst;
  77 size_t dstlen;
  78 {
  79         const unsigned char *p;
  80         size_t n;
  81         size_t ncopy;
  82
  83         n = addrbytesptr(src, &p);
  84         if (n == 0)
  85                 return 0;
  86
  87         if (dstlen > 0) {
  88                 ncopy = n;
  89                 if (ncopy > dstlen)
  90                         ncopy = dstlen;
  91                 memcpy(dst, p, ncopy);
  92         }
  93         return n;
  94 }