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NetServices/lwip/core/snmp/asn1_enc.c@0:05ccbd4f84f1, 2013-12-02 (annotated)

Committer:
hendrikvincent
Date:
Mon Dec 02 09:01:23 2013 +0000
Revision:
0:05ccbd4f84f1
eerste programma;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hendrikvincent 0:05ccbd4f84f1 1 /**
hendrikvincent 0:05ccbd4f84f1 2 * @file
hendrikvincent 0:05ccbd4f84f1 3 * Abstract Syntax Notation One (ISO 8824, 8825) encoding
hendrikvincent 0:05ccbd4f84f1 4 *
hendrikvincent 0:05ccbd4f84f1 5 * @todo not optimised (yet), favor correctness over speed, favor speed over size
hendrikvincent 0:05ccbd4f84f1 6 */
hendrikvincent 0:05ccbd4f84f1 7
hendrikvincent 0:05ccbd4f84f1 8 /*
hendrikvincent 0:05ccbd4f84f1 9 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
hendrikvincent 0:05ccbd4f84f1 10 * All rights reserved.
hendrikvincent 0:05ccbd4f84f1 11 *
hendrikvincent 0:05ccbd4f84f1 12 * Redistribution and use in source and binary forms, with or without modification,
hendrikvincent 0:05ccbd4f84f1 13 * are permitted provided that the following conditions are met:
hendrikvincent 0:05ccbd4f84f1 14 *
hendrikvincent 0:05ccbd4f84f1 15 * 1. Redistributions of source code must retain the above copyright notice,
hendrikvincent 0:05ccbd4f84f1 16 * this list of conditions and the following disclaimer.
hendrikvincent 0:05ccbd4f84f1 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
hendrikvincent 0:05ccbd4f84f1 18 * this list of conditions and the following disclaimer in the documentation
hendrikvincent 0:05ccbd4f84f1 19 * and/or other materials provided with the distribution.
hendrikvincent 0:05ccbd4f84f1 20 * 3. The name of the author may not be used to endorse or promote products
hendrikvincent 0:05ccbd4f84f1 21 * derived from this software without specific prior written permission.
hendrikvincent 0:05ccbd4f84f1 22 *
hendrikvincent 0:05ccbd4f84f1 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hendrikvincent 0:05ccbd4f84f1 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hendrikvincent 0:05ccbd4f84f1 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hendrikvincent 0:05ccbd4f84f1 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hendrikvincent 0:05ccbd4f84f1 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hendrikvincent 0:05ccbd4f84f1 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hendrikvincent 0:05ccbd4f84f1 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hendrikvincent 0:05ccbd4f84f1 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hendrikvincent 0:05ccbd4f84f1 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hendrikvincent 0:05ccbd4f84f1 32 * OF SUCH DAMAGE.
hendrikvincent 0:05ccbd4f84f1 33 *
hendrikvincent 0:05ccbd4f84f1 34 * Author: Christiaan Simons <christiaan.simons@axon.tv>
hendrikvincent 0:05ccbd4f84f1 35 */
hendrikvincent 0:05ccbd4f84f1 36
hendrikvincent 0:05ccbd4f84f1 37 #include "lwip/opt.h"
hendrikvincent 0:05ccbd4f84f1 38
hendrikvincent 0:05ccbd4f84f1 39 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
hendrikvincent 0:05ccbd4f84f1 40
hendrikvincent 0:05ccbd4f84f1 41 #include "lwip/snmp_asn1.h"
hendrikvincent 0:05ccbd4f84f1 42
hendrikvincent 0:05ccbd4f84f1 43 /**
hendrikvincent 0:05ccbd4f84f1 44 * Returns octet count for length.
hendrikvincent 0:05ccbd4f84f1 45 *
hendrikvincent 0:05ccbd4f84f1 46 * @param length
hendrikvincent 0:05ccbd4f84f1 47 * @param octets_needed points to the return value
hendrikvincent 0:05ccbd4f84f1 48 */
hendrikvincent 0:05ccbd4f84f1 49 void
hendrikvincent 0:05ccbd4f84f1 50 snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed)
hendrikvincent 0:05ccbd4f84f1 51 {
hendrikvincent 0:05ccbd4f84f1 52 if (length < 0x80U)
hendrikvincent 0:05ccbd4f84f1 53 {
hendrikvincent 0:05ccbd4f84f1 54 *octets_needed = 1;
hendrikvincent 0:05ccbd4f84f1 55 }
hendrikvincent 0:05ccbd4f84f1 56 else if (length < 0x100U)
hendrikvincent 0:05ccbd4f84f1 57 {
hendrikvincent 0:05ccbd4f84f1 58 *octets_needed = 2;
hendrikvincent 0:05ccbd4f84f1 59 }
hendrikvincent 0:05ccbd4f84f1 60 else
hendrikvincent 0:05ccbd4f84f1 61 {
hendrikvincent 0:05ccbd4f84f1 62 *octets_needed = 3;
hendrikvincent 0:05ccbd4f84f1 63 }
hendrikvincent 0:05ccbd4f84f1 64 }
hendrikvincent 0:05ccbd4f84f1 65
hendrikvincent 0:05ccbd4f84f1 66 /**
hendrikvincent 0:05ccbd4f84f1 67 * Returns octet count for an u32_t.
hendrikvincent 0:05ccbd4f84f1 68 *
hendrikvincent 0:05ccbd4f84f1 69 * @param value
hendrikvincent 0:05ccbd4f84f1 70 * @param octets_needed points to the return value
hendrikvincent 0:05ccbd4f84f1 71 *
hendrikvincent 0:05ccbd4f84f1 72 * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded
hendrikvincent 0:05ccbd4f84f1 73 * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value
hendrikvincent 0:05ccbd4f84f1 74 * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!!
hendrikvincent 0:05ccbd4f84f1 75 */
hendrikvincent 0:05ccbd4f84f1 76 void
hendrikvincent 0:05ccbd4f84f1 77 snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed)
hendrikvincent 0:05ccbd4f84f1 78 {
hendrikvincent 0:05ccbd4f84f1 79 if (value < 0x80UL)
hendrikvincent 0:05ccbd4f84f1 80 {
hendrikvincent 0:05ccbd4f84f1 81 *octets_needed = 1;
hendrikvincent 0:05ccbd4f84f1 82 }
hendrikvincent 0:05ccbd4f84f1 83 else if (value < 0x8000UL)
hendrikvincent 0:05ccbd4f84f1 84 {
hendrikvincent 0:05ccbd4f84f1 85 *octets_needed = 2;
hendrikvincent 0:05ccbd4f84f1 86 }
hendrikvincent 0:05ccbd4f84f1 87 else if (value < 0x800000UL)
hendrikvincent 0:05ccbd4f84f1 88 {
hendrikvincent 0:05ccbd4f84f1 89 *octets_needed = 3;
hendrikvincent 0:05ccbd4f84f1 90 }
hendrikvincent 0:05ccbd4f84f1 91 else if (value < 0x80000000UL)
hendrikvincent 0:05ccbd4f84f1 92 {
hendrikvincent 0:05ccbd4f84f1 93 *octets_needed = 4;
hendrikvincent 0:05ccbd4f84f1 94 }
hendrikvincent 0:05ccbd4f84f1 95 else
hendrikvincent 0:05ccbd4f84f1 96 {
hendrikvincent 0:05ccbd4f84f1 97 *octets_needed = 5;
hendrikvincent 0:05ccbd4f84f1 98 }
hendrikvincent 0:05ccbd4f84f1 99 }
hendrikvincent 0:05ccbd4f84f1 100
hendrikvincent 0:05ccbd4f84f1 101 /**
hendrikvincent 0:05ccbd4f84f1 102 * Returns octet count for an s32_t.
hendrikvincent 0:05ccbd4f84f1 103 *
hendrikvincent 0:05ccbd4f84f1 104 * @param value
hendrikvincent 0:05ccbd4f84f1 105 * @param octets_needed points to the return value
hendrikvincent 0:05ccbd4f84f1 106 *
hendrikvincent 0:05ccbd4f84f1 107 * @note ASN coded integers are _always_ signed.
hendrikvincent 0:05ccbd4f84f1 108 */
hendrikvincent 0:05ccbd4f84f1 109 void
hendrikvincent 0:05ccbd4f84f1 110 snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed)
hendrikvincent 0:05ccbd4f84f1 111 {
hendrikvincent 0:05ccbd4f84f1 112 if (value < 0)
hendrikvincent 0:05ccbd4f84f1 113 {
hendrikvincent 0:05ccbd4f84f1 114 value = ~value;
hendrikvincent 0:05ccbd4f84f1 115 }
hendrikvincent 0:05ccbd4f84f1 116 if (value < 0x80L)
hendrikvincent 0:05ccbd4f84f1 117 {
hendrikvincent 0:05ccbd4f84f1 118 *octets_needed = 1;
hendrikvincent 0:05ccbd4f84f1 119 }
hendrikvincent 0:05ccbd4f84f1 120 else if (value < 0x8000L)
hendrikvincent 0:05ccbd4f84f1 121 {
hendrikvincent 0:05ccbd4f84f1 122 *octets_needed = 2;
hendrikvincent 0:05ccbd4f84f1 123 }
hendrikvincent 0:05ccbd4f84f1 124 else if (value < 0x800000L)
hendrikvincent 0:05ccbd4f84f1 125 {
hendrikvincent 0:05ccbd4f84f1 126 *octets_needed = 3;
hendrikvincent 0:05ccbd4f84f1 127 }
hendrikvincent 0:05ccbd4f84f1 128 else
hendrikvincent 0:05ccbd4f84f1 129 {
hendrikvincent 0:05ccbd4f84f1 130 *octets_needed = 4;
hendrikvincent 0:05ccbd4f84f1 131 }
hendrikvincent 0:05ccbd4f84f1 132 }
hendrikvincent 0:05ccbd4f84f1 133
hendrikvincent 0:05ccbd4f84f1 134 /**
hendrikvincent 0:05ccbd4f84f1 135 * Returns octet count for an object identifier.
hendrikvincent 0:05ccbd4f84f1 136 *
hendrikvincent 0:05ccbd4f84f1 137 * @param ident_len object identifier array length
hendrikvincent 0:05ccbd4f84f1 138 * @param ident points to object identifier array
hendrikvincent 0:05ccbd4f84f1 139 * @param octets_needed points to the return value
hendrikvincent 0:05ccbd4f84f1 140 */
hendrikvincent 0:05ccbd4f84f1 141 void
hendrikvincent 0:05ccbd4f84f1 142 snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed)
hendrikvincent 0:05ccbd4f84f1 143 {
hendrikvincent 0:05ccbd4f84f1 144 s32_t sub_id;
hendrikvincent 0:05ccbd4f84f1 145 u8_t cnt;
hendrikvincent 0:05ccbd4f84f1 146
hendrikvincent 0:05ccbd4f84f1 147 cnt = 0;
hendrikvincent 0:05ccbd4f84f1 148 if (ident_len > 1)
hendrikvincent 0:05ccbd4f84f1 149 {
hendrikvincent 0:05ccbd4f84f1 150 /* compressed prefix in one octet */
hendrikvincent 0:05ccbd4f84f1 151 cnt++;
hendrikvincent 0:05ccbd4f84f1 152 ident_len -= 2;
hendrikvincent 0:05ccbd4f84f1 153 ident += 2;
hendrikvincent 0:05ccbd4f84f1 154 }
hendrikvincent 0:05ccbd4f84f1 155 while(ident_len > 0)
hendrikvincent 0:05ccbd4f84f1 156 {
hendrikvincent 0:05ccbd4f84f1 157 ident_len--;
hendrikvincent 0:05ccbd4f84f1 158 sub_id = *ident;
hendrikvincent 0:05ccbd4f84f1 159
hendrikvincent 0:05ccbd4f84f1 160 sub_id >>= 7;
hendrikvincent 0:05ccbd4f84f1 161 cnt++;
hendrikvincent 0:05ccbd4f84f1 162 while(sub_id > 0)
hendrikvincent 0:05ccbd4f84f1 163 {
hendrikvincent 0:05ccbd4f84f1 164 sub_id >>= 7;
hendrikvincent 0:05ccbd4f84f1 165 cnt++;
hendrikvincent 0:05ccbd4f84f1 166 }
hendrikvincent 0:05ccbd4f84f1 167 ident++;
hendrikvincent 0:05ccbd4f84f1 168 }
hendrikvincent 0:05ccbd4f84f1 169 *octets_needed = cnt;
hendrikvincent 0:05ccbd4f84f1 170 }
hendrikvincent 0:05ccbd4f84f1 171
hendrikvincent 0:05ccbd4f84f1 172 /**
hendrikvincent 0:05ccbd4f84f1 173 * Encodes ASN type field into a pbuf chained ASN1 msg.
hendrikvincent 0:05ccbd4f84f1 174 *
hendrikvincent 0:05ccbd4f84f1 175 * @param p points to output pbuf to encode value into
hendrikvincent 0:05ccbd4f84f1 176 * @param ofs points to the offset within the pbuf chain
hendrikvincent 0:05ccbd4f84f1 177 * @param type input ASN1 type
hendrikvincent 0:05ccbd4f84f1 178 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
hendrikvincent 0:05ccbd4f84f1 179 */
hendrikvincent 0:05ccbd4f84f1 180 err_t
hendrikvincent 0:05ccbd4f84f1 181 snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type)
hendrikvincent 0:05ccbd4f84f1 182 {
hendrikvincent 0:05ccbd4f84f1 183 u16_t plen, base;
hendrikvincent 0:05ccbd4f84f1 184 u8_t *msg_ptr;
hendrikvincent 0:05ccbd4f84f1 185
hendrikvincent 0:05ccbd4f84f1 186 plen = 0;
hendrikvincent 0:05ccbd4f84f1 187 while (p != NULL)
hendrikvincent 0:05ccbd4f84f1 188 {
hendrikvincent 0:05ccbd4f84f1 189 base = plen;
hendrikvincent 0:05ccbd4f84f1 190 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 191 if (ofs < plen)
hendrikvincent 0:05ccbd4f84f1 192 {
hendrikvincent 0:05ccbd4f84f1 193 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 194 msg_ptr += ofs - base;
hendrikvincent 0:05ccbd4f84f1 195 *msg_ptr = type;
hendrikvincent 0:05ccbd4f84f1 196 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 197 }
hendrikvincent 0:05ccbd4f84f1 198 p = p->next;
hendrikvincent 0:05ccbd4f84f1 199 }
hendrikvincent 0:05ccbd4f84f1 200 /* p == NULL, ofs >= plen */
hendrikvincent 0:05ccbd4f84f1 201 return ERR_ARG;
hendrikvincent 0:05ccbd4f84f1 202 }
hendrikvincent 0:05ccbd4f84f1 203
hendrikvincent 0:05ccbd4f84f1 204 /**
hendrikvincent 0:05ccbd4f84f1 205 * Encodes host order length field into a pbuf chained ASN1 msg.
hendrikvincent 0:05ccbd4f84f1 206 *
hendrikvincent 0:05ccbd4f84f1 207 * @param p points to output pbuf to encode length into
hendrikvincent 0:05ccbd4f84f1 208 * @param ofs points to the offset within the pbuf chain
hendrikvincent 0:05ccbd4f84f1 209 * @param length is the host order length to be encoded
hendrikvincent 0:05ccbd4f84f1 210 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
hendrikvincent 0:05ccbd4f84f1 211 */
hendrikvincent 0:05ccbd4f84f1 212 err_t
hendrikvincent 0:05ccbd4f84f1 213 snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length)
hendrikvincent 0:05ccbd4f84f1 214 {
hendrikvincent 0:05ccbd4f84f1 215 u16_t plen, base;
hendrikvincent 0:05ccbd4f84f1 216 u8_t *msg_ptr;
hendrikvincent 0:05ccbd4f84f1 217
hendrikvincent 0:05ccbd4f84f1 218 plen = 0;
hendrikvincent 0:05ccbd4f84f1 219 while (p != NULL)
hendrikvincent 0:05ccbd4f84f1 220 {
hendrikvincent 0:05ccbd4f84f1 221 base = plen;
hendrikvincent 0:05ccbd4f84f1 222 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 223 if (ofs < plen)
hendrikvincent 0:05ccbd4f84f1 224 {
hendrikvincent 0:05ccbd4f84f1 225 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 226 msg_ptr += ofs - base;
hendrikvincent 0:05ccbd4f84f1 227
hendrikvincent 0:05ccbd4f84f1 228 if (length < 0x80)
hendrikvincent 0:05ccbd4f84f1 229 {
hendrikvincent 0:05ccbd4f84f1 230 *msg_ptr = (u8_t)length;
hendrikvincent 0:05ccbd4f84f1 231 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 232 }
hendrikvincent 0:05ccbd4f84f1 233 else if (length < 0x100)
hendrikvincent 0:05ccbd4f84f1 234 {
hendrikvincent 0:05ccbd4f84f1 235 *msg_ptr = 0x81;
hendrikvincent 0:05ccbd4f84f1 236 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 237 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 238 {
hendrikvincent 0:05ccbd4f84f1 239 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 240 p = p->next;
hendrikvincent 0:05ccbd4f84f1 241 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 242 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 243 }
hendrikvincent 0:05ccbd4f84f1 244 else
hendrikvincent 0:05ccbd4f84f1 245 {
hendrikvincent 0:05ccbd4f84f1 246 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 247 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 248 }
hendrikvincent 0:05ccbd4f84f1 249 *msg_ptr = (u8_t)length;
hendrikvincent 0:05ccbd4f84f1 250 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 251 }
hendrikvincent 0:05ccbd4f84f1 252 else
hendrikvincent 0:05ccbd4f84f1 253 {
hendrikvincent 0:05ccbd4f84f1 254 u8_t i;
hendrikvincent 0:05ccbd4f84f1 255
hendrikvincent 0:05ccbd4f84f1 256 /* length >= 0x100 && length <= 0xFFFF */
hendrikvincent 0:05ccbd4f84f1 257 *msg_ptr = 0x82;
hendrikvincent 0:05ccbd4f84f1 258 i = 2;
hendrikvincent 0:05ccbd4f84f1 259 while (i > 0)
hendrikvincent 0:05ccbd4f84f1 260 {
hendrikvincent 0:05ccbd4f84f1 261 i--;
hendrikvincent 0:05ccbd4f84f1 262 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 263 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 264 {
hendrikvincent 0:05ccbd4f84f1 265 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 266 p = p->next;
hendrikvincent 0:05ccbd4f84f1 267 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 268 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 269 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 270 }
hendrikvincent 0:05ccbd4f84f1 271 else
hendrikvincent 0:05ccbd4f84f1 272 {
hendrikvincent 0:05ccbd4f84f1 273 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 274 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 275 }
hendrikvincent 0:05ccbd4f84f1 276 if (i == 0)
hendrikvincent 0:05ccbd4f84f1 277 {
hendrikvincent 0:05ccbd4f84f1 278 /* least significant length octet */
hendrikvincent 0:05ccbd4f84f1 279 *msg_ptr = (u8_t)length;
hendrikvincent 0:05ccbd4f84f1 280 }
hendrikvincent 0:05ccbd4f84f1 281 else
hendrikvincent 0:05ccbd4f84f1 282 {
hendrikvincent 0:05ccbd4f84f1 283 /* most significant length octet */
hendrikvincent 0:05ccbd4f84f1 284 *msg_ptr = (u8_t)(length >> 8);
hendrikvincent 0:05ccbd4f84f1 285 }
hendrikvincent 0:05ccbd4f84f1 286 }
hendrikvincent 0:05ccbd4f84f1 287 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 288 }
hendrikvincent 0:05ccbd4f84f1 289 }
hendrikvincent 0:05ccbd4f84f1 290 p = p->next;
hendrikvincent 0:05ccbd4f84f1 291 }
hendrikvincent 0:05ccbd4f84f1 292 /* p == NULL, ofs >= plen */
hendrikvincent 0:05ccbd4f84f1 293 return ERR_ARG;
hendrikvincent 0:05ccbd4f84f1 294 }
hendrikvincent 0:05ccbd4f84f1 295
hendrikvincent 0:05ccbd4f84f1 296 /**
hendrikvincent 0:05ccbd4f84f1 297 * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg.
hendrikvincent 0:05ccbd4f84f1 298 *
hendrikvincent 0:05ccbd4f84f1 299 * @param p points to output pbuf to encode value into
hendrikvincent 0:05ccbd4f84f1 300 * @param ofs points to the offset within the pbuf chain
hendrikvincent 0:05ccbd4f84f1 301 * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt())
hendrikvincent 0:05ccbd4f84f1 302 * @param value is the host order u32_t value to be encoded
hendrikvincent 0:05ccbd4f84f1 303 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
hendrikvincent 0:05ccbd4f84f1 304 *
hendrikvincent 0:05ccbd4f84f1 305 * @see snmp_asn1_enc_u32t_cnt()
hendrikvincent 0:05ccbd4f84f1 306 */
hendrikvincent 0:05ccbd4f84f1 307 err_t
hendrikvincent 0:05ccbd4f84f1 308 snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value)
hendrikvincent 0:05ccbd4f84f1 309 {
hendrikvincent 0:05ccbd4f84f1 310 u16_t plen, base;
hendrikvincent 0:05ccbd4f84f1 311 u8_t *msg_ptr;
hendrikvincent 0:05ccbd4f84f1 312
hendrikvincent 0:05ccbd4f84f1 313 plen = 0;
hendrikvincent 0:05ccbd4f84f1 314 while (p != NULL)
hendrikvincent 0:05ccbd4f84f1 315 {
hendrikvincent 0:05ccbd4f84f1 316 base = plen;
hendrikvincent 0:05ccbd4f84f1 317 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 318 if (ofs < plen)
hendrikvincent 0:05ccbd4f84f1 319 {
hendrikvincent 0:05ccbd4f84f1 320 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 321 msg_ptr += ofs - base;
hendrikvincent 0:05ccbd4f84f1 322
hendrikvincent 0:05ccbd4f84f1 323 if (octets_needed == 5)
hendrikvincent 0:05ccbd4f84f1 324 {
hendrikvincent 0:05ccbd4f84f1 325 /* not enough bits in 'value' add leading 0x00 */
hendrikvincent 0:05ccbd4f84f1 326 octets_needed--;
hendrikvincent 0:05ccbd4f84f1 327 *msg_ptr = 0x00;
hendrikvincent 0:05ccbd4f84f1 328 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 329 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 330 {
hendrikvincent 0:05ccbd4f84f1 331 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 332 p = p->next;
hendrikvincent 0:05ccbd4f84f1 333 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 334 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 335 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 336 }
hendrikvincent 0:05ccbd4f84f1 337 else
hendrikvincent 0:05ccbd4f84f1 338 {
hendrikvincent 0:05ccbd4f84f1 339 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 340 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 341 }
hendrikvincent 0:05ccbd4f84f1 342 }
hendrikvincent 0:05ccbd4f84f1 343 while (octets_needed > 1)
hendrikvincent 0:05ccbd4f84f1 344 {
hendrikvincent 0:05ccbd4f84f1 345 octets_needed--;
hendrikvincent 0:05ccbd4f84f1 346 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
hendrikvincent 0:05ccbd4f84f1 347 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 348 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 349 {
hendrikvincent 0:05ccbd4f84f1 350 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 351 p = p->next;
hendrikvincent 0:05ccbd4f84f1 352 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 353 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 354 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 355 }
hendrikvincent 0:05ccbd4f84f1 356 else
hendrikvincent 0:05ccbd4f84f1 357 {
hendrikvincent 0:05ccbd4f84f1 358 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 359 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 360 }
hendrikvincent 0:05ccbd4f84f1 361 }
hendrikvincent 0:05ccbd4f84f1 362 /* (only) one least significant octet */
hendrikvincent 0:05ccbd4f84f1 363 *msg_ptr = (u8_t)value;
hendrikvincent 0:05ccbd4f84f1 364 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 365 }
hendrikvincent 0:05ccbd4f84f1 366 p = p->next;
hendrikvincent 0:05ccbd4f84f1 367 }
hendrikvincent 0:05ccbd4f84f1 368 /* p == NULL, ofs >= plen */
hendrikvincent 0:05ccbd4f84f1 369 return ERR_ARG;
hendrikvincent 0:05ccbd4f84f1 370 }
hendrikvincent 0:05ccbd4f84f1 371
hendrikvincent 0:05ccbd4f84f1 372 /**
hendrikvincent 0:05ccbd4f84f1 373 * Encodes s32_t integer into a pbuf chained ASN1 msg.
hendrikvincent 0:05ccbd4f84f1 374 *
hendrikvincent 0:05ccbd4f84f1 375 * @param p points to output pbuf to encode value into
hendrikvincent 0:05ccbd4f84f1 376 * @param ofs points to the offset within the pbuf chain
hendrikvincent 0:05ccbd4f84f1 377 * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt())
hendrikvincent 0:05ccbd4f84f1 378 * @param value is the host order s32_t value to be encoded
hendrikvincent 0:05ccbd4f84f1 379 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
hendrikvincent 0:05ccbd4f84f1 380 *
hendrikvincent 0:05ccbd4f84f1 381 * @see snmp_asn1_enc_s32t_cnt()
hendrikvincent 0:05ccbd4f84f1 382 */
hendrikvincent 0:05ccbd4f84f1 383 err_t
hendrikvincent 0:05ccbd4f84f1 384 snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value)
hendrikvincent 0:05ccbd4f84f1 385 {
hendrikvincent 0:05ccbd4f84f1 386 u16_t plen, base;
hendrikvincent 0:05ccbd4f84f1 387 u8_t *msg_ptr;
hendrikvincent 0:05ccbd4f84f1 388
hendrikvincent 0:05ccbd4f84f1 389 plen = 0;
hendrikvincent 0:05ccbd4f84f1 390 while (p != NULL)
hendrikvincent 0:05ccbd4f84f1 391 {
hendrikvincent 0:05ccbd4f84f1 392 base = plen;
hendrikvincent 0:05ccbd4f84f1 393 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 394 if (ofs < plen)
hendrikvincent 0:05ccbd4f84f1 395 {
hendrikvincent 0:05ccbd4f84f1 396 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 397 msg_ptr += ofs - base;
hendrikvincent 0:05ccbd4f84f1 398
hendrikvincent 0:05ccbd4f84f1 399 while (octets_needed > 1)
hendrikvincent 0:05ccbd4f84f1 400 {
hendrikvincent 0:05ccbd4f84f1 401 octets_needed--;
hendrikvincent 0:05ccbd4f84f1 402 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
hendrikvincent 0:05ccbd4f84f1 403 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 404 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 405 {
hendrikvincent 0:05ccbd4f84f1 406 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 407 p = p->next;
hendrikvincent 0:05ccbd4f84f1 408 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 409 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 410 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 411 }
hendrikvincent 0:05ccbd4f84f1 412 else
hendrikvincent 0:05ccbd4f84f1 413 {
hendrikvincent 0:05ccbd4f84f1 414 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 415 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 416 }
hendrikvincent 0:05ccbd4f84f1 417 }
hendrikvincent 0:05ccbd4f84f1 418 /* (only) one least significant octet */
hendrikvincent 0:05ccbd4f84f1 419 *msg_ptr = (u8_t)value;
hendrikvincent 0:05ccbd4f84f1 420 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 421 }
hendrikvincent 0:05ccbd4f84f1 422 p = p->next;
hendrikvincent 0:05ccbd4f84f1 423 }
hendrikvincent 0:05ccbd4f84f1 424 /* p == NULL, ofs >= plen */
hendrikvincent 0:05ccbd4f84f1 425 return ERR_ARG;
hendrikvincent 0:05ccbd4f84f1 426 }
hendrikvincent 0:05ccbd4f84f1 427
hendrikvincent 0:05ccbd4f84f1 428 /**
hendrikvincent 0:05ccbd4f84f1 429 * Encodes object identifier into a pbuf chained ASN1 msg.
hendrikvincent 0:05ccbd4f84f1 430 *
hendrikvincent 0:05ccbd4f84f1 431 * @param p points to output pbuf to encode oid into
hendrikvincent 0:05ccbd4f84f1 432 * @param ofs points to the offset within the pbuf chain
hendrikvincent 0:05ccbd4f84f1 433 * @param ident_len object identifier array length
hendrikvincent 0:05ccbd4f84f1 434 * @param ident points to object identifier array
hendrikvincent 0:05ccbd4f84f1 435 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
hendrikvincent 0:05ccbd4f84f1 436 */
hendrikvincent 0:05ccbd4f84f1 437 err_t
hendrikvincent 0:05ccbd4f84f1 438 snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident)
hendrikvincent 0:05ccbd4f84f1 439 {
hendrikvincent 0:05ccbd4f84f1 440 u16_t plen, base;
hendrikvincent 0:05ccbd4f84f1 441 u8_t *msg_ptr;
hendrikvincent 0:05ccbd4f84f1 442
hendrikvincent 0:05ccbd4f84f1 443 plen = 0;
hendrikvincent 0:05ccbd4f84f1 444 while (p != NULL)
hendrikvincent 0:05ccbd4f84f1 445 {
hendrikvincent 0:05ccbd4f84f1 446 base = plen;
hendrikvincent 0:05ccbd4f84f1 447 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 448 if (ofs < plen)
hendrikvincent 0:05ccbd4f84f1 449 {
hendrikvincent 0:05ccbd4f84f1 450 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 451 msg_ptr += ofs - base;
hendrikvincent 0:05ccbd4f84f1 452
hendrikvincent 0:05ccbd4f84f1 453 if (ident_len > 1)
hendrikvincent 0:05ccbd4f84f1 454 {
hendrikvincent 0:05ccbd4f84f1 455 if ((ident[0] == 1) && (ident[1] == 3))
hendrikvincent 0:05ccbd4f84f1 456 {
hendrikvincent 0:05ccbd4f84f1 457 /* compressed (most common) prefix .iso.org */
hendrikvincent 0:05ccbd4f84f1 458 *msg_ptr = 0x2b;
hendrikvincent 0:05ccbd4f84f1 459 }
hendrikvincent 0:05ccbd4f84f1 460 else
hendrikvincent 0:05ccbd4f84f1 461 {
hendrikvincent 0:05ccbd4f84f1 462 /* calculate prefix */
hendrikvincent 0:05ccbd4f84f1 463 *msg_ptr = (u8_t)((ident[0] * 40) + ident[1]);
hendrikvincent 0:05ccbd4f84f1 464 }
hendrikvincent 0:05ccbd4f84f1 465 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 466 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 467 {
hendrikvincent 0:05ccbd4f84f1 468 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 469 p = p->next;
hendrikvincent 0:05ccbd4f84f1 470 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 471 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 472 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 473 }
hendrikvincent 0:05ccbd4f84f1 474 else
hendrikvincent 0:05ccbd4f84f1 475 {
hendrikvincent 0:05ccbd4f84f1 476 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 477 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 478 }
hendrikvincent 0:05ccbd4f84f1 479 ident_len -= 2;
hendrikvincent 0:05ccbd4f84f1 480 ident += 2;
hendrikvincent 0:05ccbd4f84f1 481 }
hendrikvincent 0:05ccbd4f84f1 482 else
hendrikvincent 0:05ccbd4f84f1 483 {
hendrikvincent 0:05ccbd4f84f1 484 /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */
hendrikvincent 0:05ccbd4f84f1 485 /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */
hendrikvincent 0:05ccbd4f84f1 486 return ERR_ARG;
hendrikvincent 0:05ccbd4f84f1 487 }
hendrikvincent 0:05ccbd4f84f1 488 while (ident_len > 0)
hendrikvincent 0:05ccbd4f84f1 489 {
hendrikvincent 0:05ccbd4f84f1 490 s32_t sub_id;
hendrikvincent 0:05ccbd4f84f1 491 u8_t shift, tail;
hendrikvincent 0:05ccbd4f84f1 492
hendrikvincent 0:05ccbd4f84f1 493 ident_len--;
hendrikvincent 0:05ccbd4f84f1 494 sub_id = *ident;
hendrikvincent 0:05ccbd4f84f1 495 tail = 0;
hendrikvincent 0:05ccbd4f84f1 496 shift = 28;
hendrikvincent 0:05ccbd4f84f1 497 while(shift > 0)
hendrikvincent 0:05ccbd4f84f1 498 {
hendrikvincent 0:05ccbd4f84f1 499 u8_t code;
hendrikvincent 0:05ccbd4f84f1 500
hendrikvincent 0:05ccbd4f84f1 501 code = (u8_t)(sub_id >> shift);
hendrikvincent 0:05ccbd4f84f1 502 if ((code != 0) || (tail != 0))
hendrikvincent 0:05ccbd4f84f1 503 {
hendrikvincent 0:05ccbd4f84f1 504 tail = 1;
hendrikvincent 0:05ccbd4f84f1 505 *msg_ptr = code | 0x80;
hendrikvincent 0:05ccbd4f84f1 506 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 507 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 508 {
hendrikvincent 0:05ccbd4f84f1 509 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 510 p = p->next;
hendrikvincent 0:05ccbd4f84f1 511 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 512 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 513 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 514 }
hendrikvincent 0:05ccbd4f84f1 515 else
hendrikvincent 0:05ccbd4f84f1 516 {
hendrikvincent 0:05ccbd4f84f1 517 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 518 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 519 }
hendrikvincent 0:05ccbd4f84f1 520 }
hendrikvincent 0:05ccbd4f84f1 521 shift -= 7;
hendrikvincent 0:05ccbd4f84f1 522 }
hendrikvincent 0:05ccbd4f84f1 523 *msg_ptr = (u8_t)sub_id & 0x7F;
hendrikvincent 0:05ccbd4f84f1 524 if (ident_len > 0)
hendrikvincent 0:05ccbd4f84f1 525 {
hendrikvincent 0:05ccbd4f84f1 526 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 527 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 528 {
hendrikvincent 0:05ccbd4f84f1 529 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 530 p = p->next;
hendrikvincent 0:05ccbd4f84f1 531 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 532 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 533 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 534 }
hendrikvincent 0:05ccbd4f84f1 535 else
hendrikvincent 0:05ccbd4f84f1 536 {
hendrikvincent 0:05ccbd4f84f1 537 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 538 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 539 }
hendrikvincent 0:05ccbd4f84f1 540 }
hendrikvincent 0:05ccbd4f84f1 541 /* proceed to next sub-identifier */
hendrikvincent 0:05ccbd4f84f1 542 ident++;
hendrikvincent 0:05ccbd4f84f1 543 }
hendrikvincent 0:05ccbd4f84f1 544 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 545 }
hendrikvincent 0:05ccbd4f84f1 546 p = p->next;
hendrikvincent 0:05ccbd4f84f1 547 }
hendrikvincent 0:05ccbd4f84f1 548 /* p == NULL, ofs >= plen */
hendrikvincent 0:05ccbd4f84f1 549 return ERR_ARG;
hendrikvincent 0:05ccbd4f84f1 550 }
hendrikvincent 0:05ccbd4f84f1 551
hendrikvincent 0:05ccbd4f84f1 552 /**
hendrikvincent 0:05ccbd4f84f1 553 * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg.
hendrikvincent 0:05ccbd4f84f1 554 *
hendrikvincent 0:05ccbd4f84f1 555 * @param p points to output pbuf to encode raw data into
hendrikvincent 0:05ccbd4f84f1 556 * @param ofs points to the offset within the pbuf chain
hendrikvincent 0:05ccbd4f84f1 557 * @param raw_len raw data length
hendrikvincent 0:05ccbd4f84f1 558 * @param raw points raw data
hendrikvincent 0:05ccbd4f84f1 559 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
hendrikvincent 0:05ccbd4f84f1 560 */
hendrikvincent 0:05ccbd4f84f1 561 err_t
hendrikvincent 0:05ccbd4f84f1 562 snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw)
hendrikvincent 0:05ccbd4f84f1 563 {
hendrikvincent 0:05ccbd4f84f1 564 u16_t plen, base;
hendrikvincent 0:05ccbd4f84f1 565 u8_t *msg_ptr;
hendrikvincent 0:05ccbd4f84f1 566
hendrikvincent 0:05ccbd4f84f1 567 plen = 0;
hendrikvincent 0:05ccbd4f84f1 568 while (p != NULL)
hendrikvincent 0:05ccbd4f84f1 569 {
hendrikvincent 0:05ccbd4f84f1 570 base = plen;
hendrikvincent 0:05ccbd4f84f1 571 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 572 if (ofs < plen)
hendrikvincent 0:05ccbd4f84f1 573 {
hendrikvincent 0:05ccbd4f84f1 574 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 575 msg_ptr += ofs - base;
hendrikvincent 0:05ccbd4f84f1 576
hendrikvincent 0:05ccbd4f84f1 577 while (raw_len > 1)
hendrikvincent 0:05ccbd4f84f1 578 {
hendrikvincent 0:05ccbd4f84f1 579 /* copy raw_len - 1 octets */
hendrikvincent 0:05ccbd4f84f1 580 raw_len--;
hendrikvincent 0:05ccbd4f84f1 581 *msg_ptr = *raw;
hendrikvincent 0:05ccbd4f84f1 582 raw++;
hendrikvincent 0:05ccbd4f84f1 583 ofs += 1;
hendrikvincent 0:05ccbd4f84f1 584 if (ofs >= plen)
hendrikvincent 0:05ccbd4f84f1 585 {
hendrikvincent 0:05ccbd4f84f1 586 /* next octet in next pbuf */
hendrikvincent 0:05ccbd4f84f1 587 p = p->next;
hendrikvincent 0:05ccbd4f84f1 588 if (p == NULL) { return ERR_ARG; }
hendrikvincent 0:05ccbd4f84f1 589 msg_ptr = (u8_t*)p->payload;
hendrikvincent 0:05ccbd4f84f1 590 plen += p->len;
hendrikvincent 0:05ccbd4f84f1 591 }
hendrikvincent 0:05ccbd4f84f1 592 else
hendrikvincent 0:05ccbd4f84f1 593 {
hendrikvincent 0:05ccbd4f84f1 594 /* next octet in same pbuf */
hendrikvincent 0:05ccbd4f84f1 595 msg_ptr++;
hendrikvincent 0:05ccbd4f84f1 596 }
hendrikvincent 0:05ccbd4f84f1 597 }
hendrikvincent 0:05ccbd4f84f1 598 if (raw_len > 0)
hendrikvincent 0:05ccbd4f84f1 599 {
hendrikvincent 0:05ccbd4f84f1 600 /* copy last or single octet */
hendrikvincent 0:05ccbd4f84f1 601 *msg_ptr = *raw;
hendrikvincent 0:05ccbd4f84f1 602 }
hendrikvincent 0:05ccbd4f84f1 603 return ERR_OK;
hendrikvincent 0:05ccbd4f84f1 604 }
hendrikvincent 0:05ccbd4f84f1 605 p = p->next;
hendrikvincent 0:05ccbd4f84f1 606 }
hendrikvincent 0:05ccbd4f84f1 607 /* p == NULL, ofs >= plen */
hendrikvincent 0:05ccbd4f84f1 608 return ERR_ARG;
hendrikvincent 0:05ccbd4f84f1 609 }
hendrikvincent 0:05ccbd4f84f1 610
hendrikvincent 0:05ccbd4f84f1 611 #endif /* LWIP_SNMP */