Mihail Stoyanov / HTTPServer

My fork of the HTTPServer (working)

Dependents:   DGWWebServer LAN2

Core/lwIP/core/snmp/asn1_enc.c@0:7a64fbb4069d, 2012-08-06 (annotated)

Committer:
screamer
Date:
Mon Aug 06 09:23:14 2012 +0000
Revision:
0:7a64fbb4069d
[mbed] converted /DGWWebServer/HTTPServer

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:7a64fbb4069d 1 /**
screamer 0:7a64fbb4069d 2 * @file
screamer 0:7a64fbb4069d 3 * Abstract Syntax Notation One (ISO 8824, 8825) encoding
screamer 0:7a64fbb4069d 4 *
screamer 0:7a64fbb4069d 5 * @todo not optimised (yet), favor correctness over speed, favor speed over size
screamer 0:7a64fbb4069d 6 */
screamer 0:7a64fbb4069d 7
screamer 0:7a64fbb4069d 8 /*
screamer 0:7a64fbb4069d 9 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
screamer 0:7a64fbb4069d 10 * All rights reserved.
screamer 0:7a64fbb4069d 11 *
screamer 0:7a64fbb4069d 12 * Redistribution and use in source and binary forms, with or without modification,
screamer 0:7a64fbb4069d 13 * are permitted provided that the following conditions are met:
screamer 0:7a64fbb4069d 14 *
screamer 0:7a64fbb4069d 15 * 1. Redistributions of source code must retain the above copyright notice,
screamer 0:7a64fbb4069d 16 * this list of conditions and the following disclaimer.
screamer 0:7a64fbb4069d 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
screamer 0:7a64fbb4069d 18 * this list of conditions and the following disclaimer in the documentation
screamer 0:7a64fbb4069d 19 * and/or other materials provided with the distribution.
screamer 0:7a64fbb4069d 20 * 3. The name of the author may not be used to endorse or promote products
screamer 0:7a64fbb4069d 21 * derived from this software without specific prior written permission.
screamer 0:7a64fbb4069d 22 *
screamer 0:7a64fbb4069d 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
screamer 0:7a64fbb4069d 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
screamer 0:7a64fbb4069d 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
screamer 0:7a64fbb4069d 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
screamer 0:7a64fbb4069d 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
screamer 0:7a64fbb4069d 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
screamer 0:7a64fbb4069d 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
screamer 0:7a64fbb4069d 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
screamer 0:7a64fbb4069d 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
screamer 0:7a64fbb4069d 32 * OF SUCH DAMAGE.
screamer 0:7a64fbb4069d 33 *
screamer 0:7a64fbb4069d 34 * Author: Christiaan Simons <christiaan.simons@axon.tv>
screamer 0:7a64fbb4069d 35 */
screamer 0:7a64fbb4069d 36
screamer 0:7a64fbb4069d 37 #include "lwip/opt.h"
screamer 0:7a64fbb4069d 38
screamer 0:7a64fbb4069d 39 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
screamer 0:7a64fbb4069d 40
screamer 0:7a64fbb4069d 41 #include "lwip/snmp_asn1.h"
screamer 0:7a64fbb4069d 42
screamer 0:7a64fbb4069d 43 /**
screamer 0:7a64fbb4069d 44 * Returns octet count for length.
screamer 0:7a64fbb4069d 45 *
screamer 0:7a64fbb4069d 46 * @param length
screamer 0:7a64fbb4069d 47 * @param octets_needed points to the return value
screamer 0:7a64fbb4069d 48 */
screamer 0:7a64fbb4069d 49 void
screamer 0:7a64fbb4069d 50 snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed)
screamer 0:7a64fbb4069d 51 {
screamer 0:7a64fbb4069d 52 if (length < 0x80U)
screamer 0:7a64fbb4069d 53 {
screamer 0:7a64fbb4069d 54 *octets_needed = 1;
screamer 0:7a64fbb4069d 55 }
screamer 0:7a64fbb4069d 56 else if (length < 0x100U)
screamer 0:7a64fbb4069d 57 {
screamer 0:7a64fbb4069d 58 *octets_needed = 2;
screamer 0:7a64fbb4069d 59 }
screamer 0:7a64fbb4069d 60 else
screamer 0:7a64fbb4069d 61 {
screamer 0:7a64fbb4069d 62 *octets_needed = 3;
screamer 0:7a64fbb4069d 63 }
screamer 0:7a64fbb4069d 64 }
screamer 0:7a64fbb4069d 65
screamer 0:7a64fbb4069d 66 /**
screamer 0:7a64fbb4069d 67 * Returns octet count for an u32_t.
screamer 0:7a64fbb4069d 68 *
screamer 0:7a64fbb4069d 69 * @param value
screamer 0:7a64fbb4069d 70 * @param octets_needed points to the return value
screamer 0:7a64fbb4069d 71 *
screamer 0:7a64fbb4069d 72 * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded
screamer 0:7a64fbb4069d 73 * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value
screamer 0:7a64fbb4069d 74 * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!!
screamer 0:7a64fbb4069d 75 */
screamer 0:7a64fbb4069d 76 void
screamer 0:7a64fbb4069d 77 snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed)
screamer 0:7a64fbb4069d 78 {
screamer 0:7a64fbb4069d 79 if (value < 0x80UL)
screamer 0:7a64fbb4069d 80 {
screamer 0:7a64fbb4069d 81 *octets_needed = 1;
screamer 0:7a64fbb4069d 82 }
screamer 0:7a64fbb4069d 83 else if (value < 0x8000UL)
screamer 0:7a64fbb4069d 84 {
screamer 0:7a64fbb4069d 85 *octets_needed = 2;
screamer 0:7a64fbb4069d 86 }
screamer 0:7a64fbb4069d 87 else if (value < 0x800000UL)
screamer 0:7a64fbb4069d 88 {
screamer 0:7a64fbb4069d 89 *octets_needed = 3;
screamer 0:7a64fbb4069d 90 }
screamer 0:7a64fbb4069d 91 else if (value < 0x80000000UL)
screamer 0:7a64fbb4069d 92 {
screamer 0:7a64fbb4069d 93 *octets_needed = 4;
screamer 0:7a64fbb4069d 94 }
screamer 0:7a64fbb4069d 95 else
screamer 0:7a64fbb4069d 96 {
screamer 0:7a64fbb4069d 97 *octets_needed = 5;
screamer 0:7a64fbb4069d 98 }
screamer 0:7a64fbb4069d 99 }
screamer 0:7a64fbb4069d 100
screamer 0:7a64fbb4069d 101 /**
screamer 0:7a64fbb4069d 102 * Returns octet count for an s32_t.
screamer 0:7a64fbb4069d 103 *
screamer 0:7a64fbb4069d 104 * @param value
screamer 0:7a64fbb4069d 105 * @param octets_needed points to the return value
screamer 0:7a64fbb4069d 106 *
screamer 0:7a64fbb4069d 107 * @note ASN coded integers are _always_ signed.
screamer 0:7a64fbb4069d 108 */
screamer 0:7a64fbb4069d 109 void
screamer 0:7a64fbb4069d 110 snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed)
screamer 0:7a64fbb4069d 111 {
screamer 0:7a64fbb4069d 112 if (value < 0)
screamer 0:7a64fbb4069d 113 {
screamer 0:7a64fbb4069d 114 value = ~value;
screamer 0:7a64fbb4069d 115 }
screamer 0:7a64fbb4069d 116 if (value < 0x80L)
screamer 0:7a64fbb4069d 117 {
screamer 0:7a64fbb4069d 118 *octets_needed = 1;
screamer 0:7a64fbb4069d 119 }
screamer 0:7a64fbb4069d 120 else if (value < 0x8000L)
screamer 0:7a64fbb4069d 121 {
screamer 0:7a64fbb4069d 122 *octets_needed = 2;
screamer 0:7a64fbb4069d 123 }
screamer 0:7a64fbb4069d 124 else if (value < 0x800000L)
screamer 0:7a64fbb4069d 125 {
screamer 0:7a64fbb4069d 126 *octets_needed = 3;
screamer 0:7a64fbb4069d 127 }
screamer 0:7a64fbb4069d 128 else
screamer 0:7a64fbb4069d 129 {
screamer 0:7a64fbb4069d 130 *octets_needed = 4;
screamer 0:7a64fbb4069d 131 }
screamer 0:7a64fbb4069d 132 }
screamer 0:7a64fbb4069d 133
screamer 0:7a64fbb4069d 134 /**
screamer 0:7a64fbb4069d 135 * Returns octet count for an object identifier.
screamer 0:7a64fbb4069d 136 *
screamer 0:7a64fbb4069d 137 * @param ident_len object identifier array length
screamer 0:7a64fbb4069d 138 * @param ident points to object identifier array
screamer 0:7a64fbb4069d 139 * @param octets_needed points to the return value
screamer 0:7a64fbb4069d 140 */
screamer 0:7a64fbb4069d 141 void
screamer 0:7a64fbb4069d 142 snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed)
screamer 0:7a64fbb4069d 143 {
screamer 0:7a64fbb4069d 144 s32_t sub_id;
screamer 0:7a64fbb4069d 145 u8_t cnt;
screamer 0:7a64fbb4069d 146
screamer 0:7a64fbb4069d 147 cnt = 0;
screamer 0:7a64fbb4069d 148 if (ident_len > 1)
screamer 0:7a64fbb4069d 149 {
screamer 0:7a64fbb4069d 150 /* compressed prefix in one octet */
screamer 0:7a64fbb4069d 151 cnt++;
screamer 0:7a64fbb4069d 152 ident_len -= 2;
screamer 0:7a64fbb4069d 153 ident += 2;
screamer 0:7a64fbb4069d 154 }
screamer 0:7a64fbb4069d 155 while(ident_len > 0)
screamer 0:7a64fbb4069d 156 {
screamer 0:7a64fbb4069d 157 ident_len--;
screamer 0:7a64fbb4069d 158 sub_id = *ident;
screamer 0:7a64fbb4069d 159
screamer 0:7a64fbb4069d 160 sub_id >>= 7;
screamer 0:7a64fbb4069d 161 cnt++;
screamer 0:7a64fbb4069d 162 while(sub_id > 0)
screamer 0:7a64fbb4069d 163 {
screamer 0:7a64fbb4069d 164 sub_id >>= 7;
screamer 0:7a64fbb4069d 165 cnt++;
screamer 0:7a64fbb4069d 166 }
screamer 0:7a64fbb4069d 167 ident++;
screamer 0:7a64fbb4069d 168 }
screamer 0:7a64fbb4069d 169 *octets_needed = cnt;
screamer 0:7a64fbb4069d 170 }
screamer 0:7a64fbb4069d 171
screamer 0:7a64fbb4069d 172 /**
screamer 0:7a64fbb4069d 173 * Encodes ASN type field into a pbuf chained ASN1 msg.
screamer 0:7a64fbb4069d 174 *
screamer 0:7a64fbb4069d 175 * @param p points to output pbuf to encode value into
screamer 0:7a64fbb4069d 176 * @param ofs points to the offset within the pbuf chain
screamer 0:7a64fbb4069d 177 * @param type input ASN1 type
screamer 0:7a64fbb4069d 178 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
screamer 0:7a64fbb4069d 179 */
screamer 0:7a64fbb4069d 180 err_t
screamer 0:7a64fbb4069d 181 snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type)
screamer 0:7a64fbb4069d 182 {
screamer 0:7a64fbb4069d 183 u16_t plen, base;
screamer 0:7a64fbb4069d 184 u8_t *msg_ptr;
screamer 0:7a64fbb4069d 185
screamer 0:7a64fbb4069d 186 plen = 0;
screamer 0:7a64fbb4069d 187 while (p != NULL)
screamer 0:7a64fbb4069d 188 {
screamer 0:7a64fbb4069d 189 base = plen;
screamer 0:7a64fbb4069d 190 plen += p->len;
screamer 0:7a64fbb4069d 191 if (ofs < plen)
screamer 0:7a64fbb4069d 192 {
screamer 0:7a64fbb4069d 193 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 194 msg_ptr += ofs - base;
screamer 0:7a64fbb4069d 195 *msg_ptr = type;
screamer 0:7a64fbb4069d 196 return ERR_OK;
screamer 0:7a64fbb4069d 197 }
screamer 0:7a64fbb4069d 198 p = p->next;
screamer 0:7a64fbb4069d 199 }
screamer 0:7a64fbb4069d 200 /* p == NULL, ofs >= plen */
screamer 0:7a64fbb4069d 201 return ERR_ARG;
screamer 0:7a64fbb4069d 202 }
screamer 0:7a64fbb4069d 203
screamer 0:7a64fbb4069d 204 /**
screamer 0:7a64fbb4069d 205 * Encodes host order length field into a pbuf chained ASN1 msg.
screamer 0:7a64fbb4069d 206 *
screamer 0:7a64fbb4069d 207 * @param p points to output pbuf to encode length into
screamer 0:7a64fbb4069d 208 * @param ofs points to the offset within the pbuf chain
screamer 0:7a64fbb4069d 209 * @param length is the host order length to be encoded
screamer 0:7a64fbb4069d 210 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
screamer 0:7a64fbb4069d 211 */
screamer 0:7a64fbb4069d 212 err_t
screamer 0:7a64fbb4069d 213 snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length)
screamer 0:7a64fbb4069d 214 {
screamer 0:7a64fbb4069d 215 u16_t plen, base;
screamer 0:7a64fbb4069d 216 u8_t *msg_ptr;
screamer 0:7a64fbb4069d 217
screamer 0:7a64fbb4069d 218 plen = 0;
screamer 0:7a64fbb4069d 219 while (p != NULL)
screamer 0:7a64fbb4069d 220 {
screamer 0:7a64fbb4069d 221 base = plen;
screamer 0:7a64fbb4069d 222 plen += p->len;
screamer 0:7a64fbb4069d 223 if (ofs < plen)
screamer 0:7a64fbb4069d 224 {
screamer 0:7a64fbb4069d 225 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 226 msg_ptr += ofs - base;
screamer 0:7a64fbb4069d 227
screamer 0:7a64fbb4069d 228 if (length < 0x80)
screamer 0:7a64fbb4069d 229 {
screamer 0:7a64fbb4069d 230 *msg_ptr = length;
screamer 0:7a64fbb4069d 231 return ERR_OK;
screamer 0:7a64fbb4069d 232 }
screamer 0:7a64fbb4069d 233 else if (length < 0x100)
screamer 0:7a64fbb4069d 234 {
screamer 0:7a64fbb4069d 235 *msg_ptr = 0x81;
screamer 0:7a64fbb4069d 236 ofs += 1;
screamer 0:7a64fbb4069d 237 if (ofs >= plen)
screamer 0:7a64fbb4069d 238 {
screamer 0:7a64fbb4069d 239 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 240 p = p->next;
screamer 0:7a64fbb4069d 241 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 242 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 243 }
screamer 0:7a64fbb4069d 244 else
screamer 0:7a64fbb4069d 245 {
screamer 0:7a64fbb4069d 246 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 247 msg_ptr++;
screamer 0:7a64fbb4069d 248 }
screamer 0:7a64fbb4069d 249 *msg_ptr = length;
screamer 0:7a64fbb4069d 250 return ERR_OK;
screamer 0:7a64fbb4069d 251 }
screamer 0:7a64fbb4069d 252 else
screamer 0:7a64fbb4069d 253 {
screamer 0:7a64fbb4069d 254 u8_t i;
screamer 0:7a64fbb4069d 255
screamer 0:7a64fbb4069d 256 /* length >= 0x100 && length <= 0xFFFF */
screamer 0:7a64fbb4069d 257 *msg_ptr = 0x82;
screamer 0:7a64fbb4069d 258 i = 2;
screamer 0:7a64fbb4069d 259 while (i > 0)
screamer 0:7a64fbb4069d 260 {
screamer 0:7a64fbb4069d 261 i--;
screamer 0:7a64fbb4069d 262 ofs += 1;
screamer 0:7a64fbb4069d 263 if (ofs >= plen)
screamer 0:7a64fbb4069d 264 {
screamer 0:7a64fbb4069d 265 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 266 p = p->next;
screamer 0:7a64fbb4069d 267 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 268 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 269 plen += p->len;
screamer 0:7a64fbb4069d 270 }
screamer 0:7a64fbb4069d 271 else
screamer 0:7a64fbb4069d 272 {
screamer 0:7a64fbb4069d 273 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 274 msg_ptr++;
screamer 0:7a64fbb4069d 275 }
screamer 0:7a64fbb4069d 276 if (i == 0)
screamer 0:7a64fbb4069d 277 {
screamer 0:7a64fbb4069d 278 /* least significant length octet */
screamer 0:7a64fbb4069d 279 *msg_ptr = length;
screamer 0:7a64fbb4069d 280 }
screamer 0:7a64fbb4069d 281 else
screamer 0:7a64fbb4069d 282 {
screamer 0:7a64fbb4069d 283 /* most significant length octet */
screamer 0:7a64fbb4069d 284 *msg_ptr = length >> 8;
screamer 0:7a64fbb4069d 285 }
screamer 0:7a64fbb4069d 286 }
screamer 0:7a64fbb4069d 287 return ERR_OK;
screamer 0:7a64fbb4069d 288 }
screamer 0:7a64fbb4069d 289 }
screamer 0:7a64fbb4069d 290 p = p->next;
screamer 0:7a64fbb4069d 291 }
screamer 0:7a64fbb4069d 292 /* p == NULL, ofs >= plen */
screamer 0:7a64fbb4069d 293 return ERR_ARG;
screamer 0:7a64fbb4069d 294 }
screamer 0:7a64fbb4069d 295
screamer 0:7a64fbb4069d 296 /**
screamer 0:7a64fbb4069d 297 * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg.
screamer 0:7a64fbb4069d 298 *
screamer 0:7a64fbb4069d 299 * @param p points to output pbuf to encode value into
screamer 0:7a64fbb4069d 300 * @param ofs points to the offset within the pbuf chain
screamer 0:7a64fbb4069d 301 * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt())
screamer 0:7a64fbb4069d 302 * @param value is the host order u32_t value to be encoded
screamer 0:7a64fbb4069d 303 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
screamer 0:7a64fbb4069d 304 *
screamer 0:7a64fbb4069d 305 * @see snmp_asn1_enc_u32t_cnt()
screamer 0:7a64fbb4069d 306 */
screamer 0:7a64fbb4069d 307 err_t
screamer 0:7a64fbb4069d 308 snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, u32_t value)
screamer 0:7a64fbb4069d 309 {
screamer 0:7a64fbb4069d 310 u16_t plen, base;
screamer 0:7a64fbb4069d 311 u8_t *msg_ptr;
screamer 0:7a64fbb4069d 312
screamer 0:7a64fbb4069d 313 plen = 0;
screamer 0:7a64fbb4069d 314 while (p != NULL)
screamer 0:7a64fbb4069d 315 {
screamer 0:7a64fbb4069d 316 base = plen;
screamer 0:7a64fbb4069d 317 plen += p->len;
screamer 0:7a64fbb4069d 318 if (ofs < plen)
screamer 0:7a64fbb4069d 319 {
screamer 0:7a64fbb4069d 320 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 321 msg_ptr += ofs - base;
screamer 0:7a64fbb4069d 322
screamer 0:7a64fbb4069d 323 if (octets_needed == 5)
screamer 0:7a64fbb4069d 324 {
screamer 0:7a64fbb4069d 325 /* not enough bits in 'value' add leading 0x00 */
screamer 0:7a64fbb4069d 326 octets_needed--;
screamer 0:7a64fbb4069d 327 *msg_ptr = 0x00;
screamer 0:7a64fbb4069d 328 ofs += 1;
screamer 0:7a64fbb4069d 329 if (ofs >= plen)
screamer 0:7a64fbb4069d 330 {
screamer 0:7a64fbb4069d 331 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 332 p = p->next;
screamer 0:7a64fbb4069d 333 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 334 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 335 plen += p->len;
screamer 0:7a64fbb4069d 336 }
screamer 0:7a64fbb4069d 337 else
screamer 0:7a64fbb4069d 338 {
screamer 0:7a64fbb4069d 339 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 340 msg_ptr++;
screamer 0:7a64fbb4069d 341 }
screamer 0:7a64fbb4069d 342 }
screamer 0:7a64fbb4069d 343 while (octets_needed > 1)
screamer 0:7a64fbb4069d 344 {
screamer 0:7a64fbb4069d 345 octets_needed--;
screamer 0:7a64fbb4069d 346 *msg_ptr = value >> (octets_needed << 3);
screamer 0:7a64fbb4069d 347 ofs += 1;
screamer 0:7a64fbb4069d 348 if (ofs >= plen)
screamer 0:7a64fbb4069d 349 {
screamer 0:7a64fbb4069d 350 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 351 p = p->next;
screamer 0:7a64fbb4069d 352 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 353 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 354 plen += p->len;
screamer 0:7a64fbb4069d 355 }
screamer 0:7a64fbb4069d 356 else
screamer 0:7a64fbb4069d 357 {
screamer 0:7a64fbb4069d 358 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 359 msg_ptr++;
screamer 0:7a64fbb4069d 360 }
screamer 0:7a64fbb4069d 361 }
screamer 0:7a64fbb4069d 362 /* (only) one least significant octet */
screamer 0:7a64fbb4069d 363 *msg_ptr = value;
screamer 0:7a64fbb4069d 364 return ERR_OK;
screamer 0:7a64fbb4069d 365 }
screamer 0:7a64fbb4069d 366 p = p->next;
screamer 0:7a64fbb4069d 367 }
screamer 0:7a64fbb4069d 368 /* p == NULL, ofs >= plen */
screamer 0:7a64fbb4069d 369 return ERR_ARG;
screamer 0:7a64fbb4069d 370 }
screamer 0:7a64fbb4069d 371
screamer 0:7a64fbb4069d 372 /**
screamer 0:7a64fbb4069d 373 * Encodes s32_t integer into a pbuf chained ASN1 msg.
screamer 0:7a64fbb4069d 374 *
screamer 0:7a64fbb4069d 375 * @param p points to output pbuf to encode value into
screamer 0:7a64fbb4069d 376 * @param ofs points to the offset within the pbuf chain
screamer 0:7a64fbb4069d 377 * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt())
screamer 0:7a64fbb4069d 378 * @param value is the host order s32_t value to be encoded
screamer 0:7a64fbb4069d 379 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
screamer 0:7a64fbb4069d 380 *
screamer 0:7a64fbb4069d 381 * @see snmp_asn1_enc_s32t_cnt()
screamer 0:7a64fbb4069d 382 */
screamer 0:7a64fbb4069d 383 err_t
screamer 0:7a64fbb4069d 384 snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, s32_t value)
screamer 0:7a64fbb4069d 385 {
screamer 0:7a64fbb4069d 386 u16_t plen, base;
screamer 0:7a64fbb4069d 387 u8_t *msg_ptr;
screamer 0:7a64fbb4069d 388
screamer 0:7a64fbb4069d 389 plen = 0;
screamer 0:7a64fbb4069d 390 while (p != NULL)
screamer 0:7a64fbb4069d 391 {
screamer 0:7a64fbb4069d 392 base = plen;
screamer 0:7a64fbb4069d 393 plen += p->len;
screamer 0:7a64fbb4069d 394 if (ofs < plen)
screamer 0:7a64fbb4069d 395 {
screamer 0:7a64fbb4069d 396 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 397 msg_ptr += ofs - base;
screamer 0:7a64fbb4069d 398
screamer 0:7a64fbb4069d 399 while (octets_needed > 1)
screamer 0:7a64fbb4069d 400 {
screamer 0:7a64fbb4069d 401 octets_needed--;
screamer 0:7a64fbb4069d 402 *msg_ptr = value >> (octets_needed << 3);
screamer 0:7a64fbb4069d 403 ofs += 1;
screamer 0:7a64fbb4069d 404 if (ofs >= plen)
screamer 0:7a64fbb4069d 405 {
screamer 0:7a64fbb4069d 406 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 407 p = p->next;
screamer 0:7a64fbb4069d 408 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 409 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 410 plen += p->len;
screamer 0:7a64fbb4069d 411 }
screamer 0:7a64fbb4069d 412 else
screamer 0:7a64fbb4069d 413 {
screamer 0:7a64fbb4069d 414 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 415 msg_ptr++;
screamer 0:7a64fbb4069d 416 }
screamer 0:7a64fbb4069d 417 }
screamer 0:7a64fbb4069d 418 /* (only) one least significant octet */
screamer 0:7a64fbb4069d 419 *msg_ptr = value;
screamer 0:7a64fbb4069d 420 return ERR_OK;
screamer 0:7a64fbb4069d 421 }
screamer 0:7a64fbb4069d 422 p = p->next;
screamer 0:7a64fbb4069d 423 }
screamer 0:7a64fbb4069d 424 /* p == NULL, ofs >= plen */
screamer 0:7a64fbb4069d 425 return ERR_ARG;
screamer 0:7a64fbb4069d 426 }
screamer 0:7a64fbb4069d 427
screamer 0:7a64fbb4069d 428 /**
screamer 0:7a64fbb4069d 429 * Encodes object identifier into a pbuf chained ASN1 msg.
screamer 0:7a64fbb4069d 430 *
screamer 0:7a64fbb4069d 431 * @param p points to output pbuf to encode oid into
screamer 0:7a64fbb4069d 432 * @param ofs points to the offset within the pbuf chain
screamer 0:7a64fbb4069d 433 * @param ident_len object identifier array length
screamer 0:7a64fbb4069d 434 * @param ident points to object identifier array
screamer 0:7a64fbb4069d 435 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
screamer 0:7a64fbb4069d 436 */
screamer 0:7a64fbb4069d 437 err_t
screamer 0:7a64fbb4069d 438 snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident)
screamer 0:7a64fbb4069d 439 {
screamer 0:7a64fbb4069d 440 u16_t plen, base;
screamer 0:7a64fbb4069d 441 u8_t *msg_ptr;
screamer 0:7a64fbb4069d 442
screamer 0:7a64fbb4069d 443 plen = 0;
screamer 0:7a64fbb4069d 444 while (p != NULL)
screamer 0:7a64fbb4069d 445 {
screamer 0:7a64fbb4069d 446 base = plen;
screamer 0:7a64fbb4069d 447 plen += p->len;
screamer 0:7a64fbb4069d 448 if (ofs < plen)
screamer 0:7a64fbb4069d 449 {
screamer 0:7a64fbb4069d 450 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 451 msg_ptr += ofs - base;
screamer 0:7a64fbb4069d 452
screamer 0:7a64fbb4069d 453 if (ident_len > 1)
screamer 0:7a64fbb4069d 454 {
screamer 0:7a64fbb4069d 455 if ((ident[0] == 1) && (ident[1] == 3))
screamer 0:7a64fbb4069d 456 {
screamer 0:7a64fbb4069d 457 /* compressed (most common) prefix .iso.org */
screamer 0:7a64fbb4069d 458 *msg_ptr = 0x2b;
screamer 0:7a64fbb4069d 459 }
screamer 0:7a64fbb4069d 460 else
screamer 0:7a64fbb4069d 461 {
screamer 0:7a64fbb4069d 462 /* calculate prefix */
screamer 0:7a64fbb4069d 463 *msg_ptr = (ident[0] * 40) + ident[1];
screamer 0:7a64fbb4069d 464 }
screamer 0:7a64fbb4069d 465 ofs += 1;
screamer 0:7a64fbb4069d 466 if (ofs >= plen)
screamer 0:7a64fbb4069d 467 {
screamer 0:7a64fbb4069d 468 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 469 p = p->next;
screamer 0:7a64fbb4069d 470 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 471 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 472 plen += p->len;
screamer 0:7a64fbb4069d 473 }
screamer 0:7a64fbb4069d 474 else
screamer 0:7a64fbb4069d 475 {
screamer 0:7a64fbb4069d 476 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 477 msg_ptr++;
screamer 0:7a64fbb4069d 478 }
screamer 0:7a64fbb4069d 479 ident_len -= 2;
screamer 0:7a64fbb4069d 480 ident += 2;
screamer 0:7a64fbb4069d 481 }
screamer 0:7a64fbb4069d 482 else
screamer 0:7a64fbb4069d 483 {
screamer 0:7a64fbb4069d 484 /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */
screamer 0:7a64fbb4069d 485 /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */
screamer 0:7a64fbb4069d 486 return ERR_ARG;
screamer 0:7a64fbb4069d 487 }
screamer 0:7a64fbb4069d 488 while (ident_len > 0)
screamer 0:7a64fbb4069d 489 {
screamer 0:7a64fbb4069d 490 s32_t sub_id;
screamer 0:7a64fbb4069d 491 u8_t shift, tail;
screamer 0:7a64fbb4069d 492
screamer 0:7a64fbb4069d 493 ident_len--;
screamer 0:7a64fbb4069d 494 sub_id = *ident;
screamer 0:7a64fbb4069d 495 tail = 0;
screamer 0:7a64fbb4069d 496 shift = 28;
screamer 0:7a64fbb4069d 497 while(shift > 0)
screamer 0:7a64fbb4069d 498 {
screamer 0:7a64fbb4069d 499 u8_t code;
screamer 0:7a64fbb4069d 500
screamer 0:7a64fbb4069d 501 code = sub_id >> shift;
screamer 0:7a64fbb4069d 502 if ((code != 0) || (tail != 0))
screamer 0:7a64fbb4069d 503 {
screamer 0:7a64fbb4069d 504 tail = 1;
screamer 0:7a64fbb4069d 505 *msg_ptr = code | 0x80;
screamer 0:7a64fbb4069d 506 ofs += 1;
screamer 0:7a64fbb4069d 507 if (ofs >= plen)
screamer 0:7a64fbb4069d 508 {
screamer 0:7a64fbb4069d 509 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 510 p = p->next;
screamer 0:7a64fbb4069d 511 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 512 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 513 plen += p->len;
screamer 0:7a64fbb4069d 514 }
screamer 0:7a64fbb4069d 515 else
screamer 0:7a64fbb4069d 516 {
screamer 0:7a64fbb4069d 517 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 518 msg_ptr++;
screamer 0:7a64fbb4069d 519 }
screamer 0:7a64fbb4069d 520 }
screamer 0:7a64fbb4069d 521 shift -= 7;
screamer 0:7a64fbb4069d 522 }
screamer 0:7a64fbb4069d 523 *msg_ptr = (u8_t)sub_id & 0x7F;
screamer 0:7a64fbb4069d 524 if (ident_len > 0)
screamer 0:7a64fbb4069d 525 {
screamer 0:7a64fbb4069d 526 ofs += 1;
screamer 0:7a64fbb4069d 527 if (ofs >= plen)
screamer 0:7a64fbb4069d 528 {
screamer 0:7a64fbb4069d 529 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 530 p = p->next;
screamer 0:7a64fbb4069d 531 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 532 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 533 plen += p->len;
screamer 0:7a64fbb4069d 534 }
screamer 0:7a64fbb4069d 535 else
screamer 0:7a64fbb4069d 536 {
screamer 0:7a64fbb4069d 537 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 538 msg_ptr++;
screamer 0:7a64fbb4069d 539 }
screamer 0:7a64fbb4069d 540 }
screamer 0:7a64fbb4069d 541 /* proceed to next sub-identifier */
screamer 0:7a64fbb4069d 542 ident++;
screamer 0:7a64fbb4069d 543 }
screamer 0:7a64fbb4069d 544 return ERR_OK;
screamer 0:7a64fbb4069d 545 }
screamer 0:7a64fbb4069d 546 p = p->next;
screamer 0:7a64fbb4069d 547 }
screamer 0:7a64fbb4069d 548 /* p == NULL, ofs >= plen */
screamer 0:7a64fbb4069d 549 return ERR_ARG;
screamer 0:7a64fbb4069d 550 }
screamer 0:7a64fbb4069d 551
screamer 0:7a64fbb4069d 552 /**
screamer 0:7a64fbb4069d 553 * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg.
screamer 0:7a64fbb4069d 554 *
screamer 0:7a64fbb4069d 555 * @param p points to output pbuf to encode raw data into
screamer 0:7a64fbb4069d 556 * @param ofs points to the offset within the pbuf chain
screamer 0:7a64fbb4069d 557 * @param raw_len raw data length
screamer 0:7a64fbb4069d 558 * @param raw points raw data
screamer 0:7a64fbb4069d 559 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
screamer 0:7a64fbb4069d 560 */
screamer 0:7a64fbb4069d 561 err_t
screamer 0:7a64fbb4069d 562 snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u8_t raw_len, u8_t *raw)
screamer 0:7a64fbb4069d 563 {
screamer 0:7a64fbb4069d 564 u16_t plen, base;
screamer 0:7a64fbb4069d 565 u8_t *msg_ptr;
screamer 0:7a64fbb4069d 566
screamer 0:7a64fbb4069d 567 plen = 0;
screamer 0:7a64fbb4069d 568 while (p != NULL)
screamer 0:7a64fbb4069d 569 {
screamer 0:7a64fbb4069d 570 base = plen;
screamer 0:7a64fbb4069d 571 plen += p->len;
screamer 0:7a64fbb4069d 572 if (ofs < plen)
screamer 0:7a64fbb4069d 573 {
screamer 0:7a64fbb4069d 574 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 575 msg_ptr += ofs - base;
screamer 0:7a64fbb4069d 576
screamer 0:7a64fbb4069d 577 while (raw_len > 1)
screamer 0:7a64fbb4069d 578 {
screamer 0:7a64fbb4069d 579 /* copy raw_len - 1 octets */
screamer 0:7a64fbb4069d 580 raw_len--;
screamer 0:7a64fbb4069d 581 *msg_ptr = *raw;
screamer 0:7a64fbb4069d 582 raw++;
screamer 0:7a64fbb4069d 583 ofs += 1;
screamer 0:7a64fbb4069d 584 if (ofs >= plen)
screamer 0:7a64fbb4069d 585 {
screamer 0:7a64fbb4069d 586 /* next octet in next pbuf */
screamer 0:7a64fbb4069d 587 p = p->next;
screamer 0:7a64fbb4069d 588 if (p == NULL) { return ERR_ARG; }
screamer 0:7a64fbb4069d 589 msg_ptr = p->payload;
screamer 0:7a64fbb4069d 590 plen += p->len;
screamer 0:7a64fbb4069d 591 }
screamer 0:7a64fbb4069d 592 else
screamer 0:7a64fbb4069d 593 {
screamer 0:7a64fbb4069d 594 /* next octet in same pbuf */
screamer 0:7a64fbb4069d 595 msg_ptr++;
screamer 0:7a64fbb4069d 596 }
screamer 0:7a64fbb4069d 597 }
screamer 0:7a64fbb4069d 598 if (raw_len > 0)
screamer 0:7a64fbb4069d 599 {
screamer 0:7a64fbb4069d 600 /* copy last or single octet */
screamer 0:7a64fbb4069d 601 *msg_ptr = *raw;
screamer 0:7a64fbb4069d 602 }
screamer 0:7a64fbb4069d 603 return ERR_OK;
screamer 0:7a64fbb4069d 604 }
screamer 0:7a64fbb4069d 605 p = p->next;
screamer 0:7a64fbb4069d 606 }
screamer 0:7a64fbb4069d 607 /* p == NULL, ofs >= plen */
screamer 0:7a64fbb4069d 608 return ERR_ARG;
screamer 0:7a64fbb4069d 609 }
screamer 0:7a64fbb4069d 610
screamer 0:7a64fbb4069d 611 #endif /* LWIP_SNMP */