1 /* 2 * Copyright (c) 2001-2003 3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus). 4 * All rights reserved. 5 * 6 * Author: Harti Brandt <harti@freebsd.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Begemot: bsnmp/lib/asn1.h,v 1.20 2005/10/05 16:43:11 brandt_h Exp $ 30 * 31 * ASN.1 for SNMP 32 */ 33 #ifndef asn1_h_ 34 #define asn1_h_ 35 36 #include <sys/types.h> 37 38 struct asn_buf { 39 union { 40 u_char *ptr; 41 const u_char *cptr; 42 } asn_u; 43 size_t asn_len; 44 }; 45 #define asn_cptr asn_u.cptr 46 #define asn_ptr asn_u.ptr 47 48 /* these restrictions are in the SMI */ 49 #define ASN_MAXID 0xffffffff 50 #define ASN_MAXOIDLEN 128 51 52 /* the string needed for this (with trailing zero) */ 53 #define ASN_OIDSTRLEN (ASN_MAXOIDLEN * (10 + 1) - 1 + 1) 54 55 /* type of subidentifiers */ 56 typedef uint32_t asn_subid_t; 57 58 struct asn_oid { 59 u_int len; 60 asn_subid_t subs[ASN_MAXOIDLEN]; 61 }; 62 63 enum asn_err { 64 /* conversion was ok */ 65 ASN_ERR_OK = 0, 66 /* conversion failed and stopped */ 67 ASN_ERR_FAILED = 1 | 0x1000, 68 /* length field bad, value skipped */ 69 ASN_ERR_BADLEN = 2, 70 /* out of buffer, stopped */ 71 ASN_ERR_EOBUF = 3 | 0x1000, 72 /* length ok, but value is out of range */ 73 ASN_ERR_RANGE = 4, 74 /* not the expected tag, stopped */ 75 ASN_ERR_TAG = 5 | 0x1000, 76 }; 77 #define ASN_ERR_STOPPED(E) (((E) & 0x1000) != 0) 78 79 /* type for the length field of encoded values. The length is restricted 80 * to 65535, but using uint16_t would give conversion warnings on gcc */ 81 typedef uint32_t asn_len_t; /* could be also uint16_t */ 82 83 /* maximal length of a long length field without the length of the length */ 84 #define ASN_MAXLEN 65535 85 #define ASN_MAXLENLEN 2 /* number of bytes in a length */ 86 87 /* maximum size of an octet string as per SMIv2 */ 88 #define ASN_MAXOCTETSTRING 65535 89 90 extern void (*asn_error)(const struct asn_buf *, const char *, ...); 91 92 enum asn_err asn_get_header(struct asn_buf *, u_char *, asn_len_t *); 93 enum asn_err asn_put_header(struct asn_buf *, u_char, asn_len_t); 94 95 enum asn_err asn_put_temp_header(struct asn_buf *, u_char, u_char **); 96 enum asn_err asn_commit_header(struct asn_buf *, u_char *); 97 98 enum asn_err asn_get_integer_raw(struct asn_buf *, asn_len_t, int32_t *); 99 enum asn_err asn_get_integer(struct asn_buf *, int32_t *); 100 enum asn_err asn_put_integer(struct asn_buf *, int32_t); 101 102 enum asn_err asn_get_octetstring_raw(struct asn_buf *, asn_len_t, u_char *, u_int *); 103 enum asn_err asn_get_octetstring(struct asn_buf *, u_char *, u_int *); 104 enum asn_err asn_put_octetstring(struct asn_buf *, const u_char *, u_int); 105 106 enum asn_err asn_get_null_raw(struct asn_buf *b, asn_len_t); 107 enum asn_err asn_get_null(struct asn_buf *); 108 enum asn_err asn_put_null(struct asn_buf *); 109 110 enum asn_err asn_put_exception(struct asn_buf *, u_int); 111 112 enum asn_err asn_get_objid_raw(struct asn_buf *, asn_len_t, struct asn_oid *); 113 enum asn_err asn_get_objid(struct asn_buf *, struct asn_oid *); 114 enum asn_err asn_put_objid(struct asn_buf *, const struct asn_oid *); 115 116 enum asn_err asn_get_sequence(struct asn_buf *, asn_len_t *); 117 118 enum asn_err asn_get_ipaddress_raw(struct asn_buf *, asn_len_t, u_char *); 119 enum asn_err asn_get_ipaddress(struct asn_buf *, u_char *); 120 enum asn_err asn_put_ipaddress(struct asn_buf *, const u_char *); 121 122 enum asn_err asn_get_uint32_raw(struct asn_buf *, asn_len_t, uint32_t *); 123 enum asn_err asn_put_uint32(struct asn_buf *, u_char, uint32_t); 124 125 enum asn_err asn_get_counter64_raw(struct asn_buf *, asn_len_t, uint64_t *); 126 enum asn_err asn_put_counter64(struct asn_buf *, uint64_t); 127 128 enum asn_err asn_get_timeticks(struct asn_buf *, uint32_t *); 129 enum asn_err asn_put_timeticks(struct asn_buf *, uint32_t); 130 131 enum asn_err asn_skip(struct asn_buf *, asn_len_t); 132 133 /* 134 * Utility functions for OIDs 135 */ 136 /* get a sub-OID from the middle of another OID */ 137 void asn_slice_oid(struct asn_oid *, const struct asn_oid *, u_int, u_int); 138 139 /* append an OID to another one */ 140 void asn_append_oid(struct asn_oid *, const struct asn_oid *); 141 142 /* compare two OIDs */ 143 int asn_compare_oid(const struct asn_oid *, const struct asn_oid *); 144 145 /* check whether the first is a suboid of the second one */ 146 int asn_is_suboid(const struct asn_oid *, const struct asn_oid *); 147 148 /* format an OID into a user buffer of size ASN_OIDSTRLEN */ 149 char *asn_oid2str_r(const struct asn_oid *, char *); 150 151 /* format an OID into a private static buffer */ 152 char *asn_oid2str(const struct asn_oid *); 153 154 enum { 155 ASN_TYPE_BOOLEAN = 0x01, 156 ASN_TYPE_INTEGER = 0x02, 157 ASN_TYPE_BITSTRING = 0x03, 158 ASN_TYPE_OCTETSTRING = 0x04, 159 ASN_TYPE_NULL = 0x05, 160 ASN_TYPE_OBJID = 0x06, 161 ASN_TYPE_SEQUENCE = 0x10, 162 163 ASN_TYPE_CONSTRUCTED = 0x20, 164 ASN_CLASS_UNIVERSAL = 0x00, 165 ASN_CLASS_APPLICATION = 0x40, 166 ASN_CLASS_CONTEXT = 0x80, 167 ASN_CLASS_PRIVATE = 0xc0, 168 ASN_TYPE_MASK = 0x1f, 169 170 ASN_APP_IPADDRESS = 0x00, 171 ASN_APP_COUNTER = 0x01, 172 ASN_APP_GAUGE = 0x02, 173 ASN_APP_TIMETICKS = 0x03, 174 ASN_APP_OPAQUE = 0x04, /* not implemented */ 175 ASN_APP_COUNTER64 = 0x06, 176 177 ASN_EXCEPT_NOSUCHOBJECT = 0x00, 178 ASN_EXCEPT_NOSUCHINSTANCE = 0x01, 179 ASN_EXCEPT_ENDOFMIBVIEW = 0x02, 180 }; 181 182 #endif 183