1 /* $OpenBSD: attribute.c,v 1.13 2017/02/03 08:23:46 guenther 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 <netinet/in.h> 34 #include <string.h> 35 36 #include "attribute.h" 37 #include "conf.h" 38 #include "log.h" 39 #include "isakmp.h" 40 #include "util.h" 41 42 u_int8_t * 43 attribute_set_basic(u_int8_t *buf, u_int16_t type, u_int16_t value) 44 { 45 SET_ISAKMP_ATTR_TYPE(buf, ISAKMP_ATTR_MAKE(1, type)); 46 SET_ISAKMP_ATTR_LENGTH_VALUE(buf, value); 47 return buf + ISAKMP_ATTR_VALUE_OFF; 48 } 49 50 u_int8_t * 51 attribute_set_var(u_int8_t *buf, u_int16_t type, u_int8_t *value, 52 u_int16_t len) 53 { 54 SET_ISAKMP_ATTR_TYPE(buf, ISAKMP_ATTR_MAKE(0, type)); 55 SET_ISAKMP_ATTR_LENGTH_VALUE(buf, len); 56 memcpy(buf + ISAKMP_ATTR_VALUE_OFF, value, len); 57 return buf + ISAKMP_ATTR_VALUE_OFF + len; 58 } 59 60 /* 61 * Execute a function FUNC taking an attribute type, value, length and ARG 62 * as arguments for each attribute in the area of ISAKMP attributes located 63 * at BUF, sized SZ. If any invocation fails, the processing aborts with a 64 * -1 return value. If all goes well return zero. 65 */ 66 int 67 attribute_map(u_int8_t *buf, size_t sz, int (*func)(u_int16_t, u_int8_t *, 68 u_int16_t, void *), void *arg) 69 { 70 u_int8_t *attr; 71 int fmt; 72 u_int16_t type; 73 u_int8_t *value; 74 u_int16_t len; 75 76 for (attr = buf; attr < buf + sz; attr = value + len) { 77 if (attr + ISAKMP_ATTR_VALUE_OFF > buf + sz) 78 return -1; 79 type = GET_ISAKMP_ATTR_TYPE(attr); 80 fmt = ISAKMP_ATTR_FORMAT(type); 81 type = ISAKMP_ATTR_TYPE(type); 82 value = attr + (fmt ? ISAKMP_ATTR_LENGTH_VALUE_OFF 83 : ISAKMP_ATTR_VALUE_OFF); 84 len = (fmt ? ISAKMP_ATTR_LENGTH_VALUE_LEN 85 : GET_ISAKMP_ATTR_LENGTH_VALUE(attr)); 86 if (value + len > buf + sz) 87 return -1; 88 if (func(type, value, len, arg)) 89 return -1; 90 } 91 return 0; 92 } 93 94 int 95 attribute_set_constant(char *section, char *tag, struct constant_map *map, 96 int attr_class, u_int8_t **attr) 97 { 98 char *name; 99 int value; 100 101 name = conf_get_str(section, tag); 102 if (!name) { 103 LOG_DBG((LOG_MISC, 70, 104 "attribute_set_constant: no %s in the %s section", tag, 105 section)); 106 return -1; 107 } 108 value = constant_value(map, name); 109 *attr = attribute_set_basic(*attr, attr_class, value); 110 return 0; 111 } 112