keyexchange/isakmpd-20041012/attribute.c

   1 /* $OpenBSD: attribute.c,v 1.11 2004/05/14 08:42:56 hshoexer Exp $       */
   2 /* $EOM: attribute.c,v 1.10 2000/02/20 19:58:36 niklas Exp $     */
   3
   4 /*
   5  * Copyright (c) 1998, 1999 Niklas Hallqvist.  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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 /*
  29  * This code was written under funding by Ericsson Radio Systems.
  30  */
  31
  32 #include <sys/types.h>
  33 #include <string.h>
  34
  35 #include "sysdep.h"
  36
  37 #include "attribute.h"
  38 #include "conf.h"
  39 #include "log.h"
  40 #include "isakmp.h"
  41 #include "util.h"
  42
  43 u_int8_t *
  44 attribute_set_basic(u_int8_t *buf, u_int16_t type, u_int16_t value)
  45 {
  46         SET_ISAKMP_ATTR_TYPE(buf, ISAKMP_ATTR_MAKE(1, type));
  47         SET_ISAKMP_ATTR_LENGTH_VALUE(buf, value);
  48         return buf + ISAKMP_ATTR_VALUE_OFF;
  49 }
  50
  51 u_int8_t *
  52 attribute_set_var(u_int8_t *buf, u_int16_t type, u_int8_t *value,
  53     u_int16_t len)
  54 {
  55         SET_ISAKMP_ATTR_TYPE(buf, ISAKMP_ATTR_MAKE(0, type));
  56         SET_ISAKMP_ATTR_LENGTH_VALUE(buf, len);
  57         memcpy(buf + ISAKMP_ATTR_VALUE_OFF, value, len);
  58         return buf + ISAKMP_ATTR_VALUE_OFF + len;
  59 }
  60
  61 /*
  62  * Execute a function FUNC taking an attribute type, value, length and ARG
  63  * as arguments for each attribute in the area of ISAKMP attributes located
  64  * at BUF, sized SZ.  If any invocation fails, the processing aborts with a
  65  * -1 return value.  If all goes well return zero.
  66  */
  67 int
  68 attribute_map(u_int8_t *buf, size_t sz, int (*func)(u_int16_t, u_int8_t *,
  69     u_int16_t, void *), void *arg)
  70 {
  71         u_int8_t       *attr;
  72         int             fmt;
  73         u_int16_t       type;
  74         u_int8_t       *value;
  75         u_int16_t       len;
  76
  77         for (attr = buf; attr < buf + sz; attr = value + len) {
  78                 if (attr + ISAKMP_ATTR_VALUE_OFF > buf + sz)
  79                         return -1;
  80                 type = GET_ISAKMP_ATTR_TYPE(attr);
  81                 fmt = ISAKMP_ATTR_FORMAT(type);
  82                 type = ISAKMP_ATTR_TYPE(type);
  83                 value = attr + (fmt ? ISAKMP_ATTR_LENGTH_VALUE_OFF
  84                     : ISAKMP_ATTR_VALUE_OFF);
  85                 len = (fmt ? ISAKMP_ATTR_LENGTH_VALUE_LEN
  86                     : GET_ISAKMP_ATTR_LENGTH_VALUE(attr));
  87                 if (value + len > buf + sz)
  88                         return -1;
  89                 if (func(type, value, len, arg))
  90                         return -1;
  91         }
  92         return 0;
  93 }
  94
  95 int
  96 attribute_set_constant(char *section, char *tag, struct constant_map *map,
  97     int attr_class, u_int8_t **attr)
  98 {
  99         char    *name;
 100         int      value;
 101
 102         name = conf_get_str(section, tag);
 103         if (!name) {
 104                 LOG_DBG((LOG_MISC, 70,
 105                     "attribute_set_constant: no %s in the %s section", tag,
 106                     section));
 107                 return -1;
 108         }
 109         value = constant_value(map, name);
 110         *attr = attribute_set_basic(*attr, attr_class, value);
 111         return 0;
 112 }