1 /* $OpenBSD: attribute.c,v 1.8 2000/02/25 17:23:38 niklas 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Ericsson Radio Systems. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * This code was written under funding by Ericsson Radio Systems. 35 */ 36 37 #include <sys/types.h> 38 #include <string.h> 39 40 #include "sysdep.h" 41 42 #include "attribute.h" 43 #include "conf.h" 44 #include "log.h" 45 #include "isakmp.h" 46 #include "util.h" 47 48 u_int8_t * 49 attribute_set_basic (u_int8_t *buf, u_int16_t type, u_int16_t value) 50 { 51 SET_ISAKMP_ATTR_TYPE (buf, ISAKMP_ATTR_MAKE (1, type)); 52 SET_ISAKMP_ATTR_LENGTH_VALUE (buf, value); 53 return buf + ISAKMP_ATTR_VALUE_OFF; 54 } 55 56 u_int8_t * 57 attribute_set_var (u_int8_t *buf, u_int16_t type, u_int8_t *value, 58 u_int16_t len) 59 { 60 SET_ISAKMP_ATTR_TYPE (buf, ISAKMP_ATTR_MAKE (0, type)); 61 SET_ISAKMP_ATTR_LENGTH_VALUE (buf, len); 62 memcpy (buf + ISAKMP_ATTR_VALUE_OFF, value, len); 63 return buf + ISAKMP_ATTR_VALUE_OFF + len; 64 } 65 66 /* 67 * Execute a function FUNC taking an attribute type, value, length and ARG 68 * as arguments for each attribute in the area of ISAKMP attributes located 69 * at BUF, sized SZ. If any invocation fails, the processing aborts with a 70 * -1 return value. If all goes well return zero. 71 */ 72 int 73 attribute_map (u_int8_t *buf, size_t sz, 74 int (*func) (u_int16_t, u_int8_t *, u_int16_t, void *), 75 void *arg) 76 { 77 u_int8_t *attr; 78 int fmt; 79 u_int16_t type; 80 u_int8_t *value; 81 u_int16_t len; 82 83 for (attr = buf; attr < buf + sz; attr = value + len) 84 { 85 if (attr + ISAKMP_ATTR_VALUE_OFF > buf + sz) 86 return -1; 87 type = GET_ISAKMP_ATTR_TYPE (attr); 88 fmt = ISAKMP_ATTR_FORMAT (type); 89 type = ISAKMP_ATTR_TYPE (type); 90 value 91 = attr + (fmt ? ISAKMP_ATTR_LENGTH_VALUE_OFF : ISAKMP_ATTR_VALUE_OFF); 92 len = (fmt ? ISAKMP_ATTR_LENGTH_VALUE_LEN 93 : GET_ISAKMP_ATTR_LENGTH_VALUE (attr)); 94 if (value + len > buf + sz) 95 return -1; 96 if (func (type, value, len, arg)) 97 return -1; 98 } 99 return 0; 100 } 101 102 int 103 attribute_set_constant (char *section, char *tag, struct constant_map *map, 104 int attr_class, u_int8_t **attr) 105 { 106 char *name; 107 int value; 108 109 name = conf_get_str (section, tag); 110 if (!name) 111 { 112 LOG_DBG ((LOG_MISC, 70, 113 "attribute_set_constant: no %s in the %s section", tag, 114 section)); 115 return -1; 116 } 117 value = constant_value (map, name); 118 *attr = attribute_set_basic (*attr, attr_class, value); 119 return 0; 120 } 121