xref: /openbsd-src/sbin/isakmpd/attribute.c (revision 8500990981f885cbe5e6a4958549cacc238b5ae6)
1 /*	$OpenBSD: attribute.c,v 1.9 2003/06/03 14:28:16 ho 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,
69 	       int (*func) (u_int16_t, u_int8_t *, u_int16_t, void *),
70 	       void *arg)
71 {
72   u_int8_t *attr;
73   int fmt;
74   u_int16_t type;
75   u_int8_t *value;
76   u_int16_t len;
77 
78   for (attr = buf; attr < buf + sz; attr = value + len)
79     {
80       if (attr + ISAKMP_ATTR_VALUE_OFF > buf + sz)
81 	return -1;
82       type = GET_ISAKMP_ATTR_TYPE (attr);
83       fmt = ISAKMP_ATTR_FORMAT (type);
84       type = ISAKMP_ATTR_TYPE (type);
85       value
86 	= attr + (fmt ? ISAKMP_ATTR_LENGTH_VALUE_OFF : ISAKMP_ATTR_VALUE_OFF);
87       len = (fmt ? ISAKMP_ATTR_LENGTH_VALUE_LEN
88 	     : GET_ISAKMP_ATTR_LENGTH_VALUE (attr));
89       if (value + len > buf + sz)
90 	return -1;
91       if (func (type, value, len, arg))
92 	return -1;
93     }
94   return 0;
95 }
96 
97 int
98 attribute_set_constant (char *section, char *tag, struct constant_map *map,
99 			int attr_class, u_int8_t **attr)
100 {
101   char *name;
102   int value;
103 
104   name = conf_get_str (section, tag);
105   if (!name)
106     {
107       LOG_DBG ((LOG_MISC, 70,
108 		"attribute_set_constant: no %s in the %s section", tag,
109 		section));
110       return -1;
111     }
112   value = constant_value (map, name);
113   *attr = attribute_set_basic (*attr, attr_class, value);
114   return 0;
115 }
116