Patrick Ciccone / F7_Ethernet

Ethernet for Nucleo and Disco board STM32F746 works with gcc and arm. IAC is untested

Dependencies:   mbed-rtos

Dependents:   IMU_ethernet

Fork of F7_Ethernet by Dieter Graef

lwip/core/snmp/asn1_enc.c@2:e0a4035b5cd1, 2016-10-06 (annotated)

Committer:
rctaduio
Date:
Thu Oct 06 16:55:16 2016 +0000
Revision:
2:e0a4035b5cd1
Parent:
0:d26c1b55cfca 
Ethernet library for F7

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:d26c1b55cfca 1 /**
DieterGraef 0:d26c1b55cfca 2 * @file
DieterGraef 0:d26c1b55cfca 3 * Abstract Syntax Notation One (ISO 8824, 8825) encoding
DieterGraef 0:d26c1b55cfca 4 *
DieterGraef 0:d26c1b55cfca 5 * @todo not optimised (yet), favor correctness over speed, favor speed over size
DieterGraef 0:d26c1b55cfca 6 */
DieterGraef 0:d26c1b55cfca 7
DieterGraef 0:d26c1b55cfca 8 /*
DieterGraef 0:d26c1b55cfca 9 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
DieterGraef 0:d26c1b55cfca 10 * All rights reserved.
DieterGraef 0:d26c1b55cfca 11 *
DieterGraef 0:d26c1b55cfca 12 * Redistribution and use in source and binary forms, with or without modification,
DieterGraef 0:d26c1b55cfca 13 * are permitted provided that the following conditions are met:
DieterGraef 0:d26c1b55cfca 14 *
DieterGraef 0:d26c1b55cfca 15 * 1. Redistributions of source code must retain the above copyright notice,
DieterGraef 0:d26c1b55cfca 16 * this list of conditions and the following disclaimer.
DieterGraef 0:d26c1b55cfca 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
DieterGraef 0:d26c1b55cfca 18 * this list of conditions and the following disclaimer in the documentation
DieterGraef 0:d26c1b55cfca 19 * and/or other materials provided with the distribution.
DieterGraef 0:d26c1b55cfca 20 * 3. The name of the author may not be used to endorse or promote products
DieterGraef 0:d26c1b55cfca 21 * derived from this software without specific prior written permission.
DieterGraef 0:d26c1b55cfca 22 *
DieterGraef 0:d26c1b55cfca 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
DieterGraef 0:d26c1b55cfca 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
DieterGraef 0:d26c1b55cfca 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
DieterGraef 0:d26c1b55cfca 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
DieterGraef 0:d26c1b55cfca 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
DieterGraef 0:d26c1b55cfca 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
DieterGraef 0:d26c1b55cfca 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
DieterGraef 0:d26c1b55cfca 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
DieterGraef 0:d26c1b55cfca 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
DieterGraef 0:d26c1b55cfca 32 * OF SUCH DAMAGE.
DieterGraef 0:d26c1b55cfca 33 *
DieterGraef 0:d26c1b55cfca 34 * Author: Christiaan Simons <christiaan.simons@axon.tv>
DieterGraef 0:d26c1b55cfca 35 */
DieterGraef 0:d26c1b55cfca 36
DieterGraef 0:d26c1b55cfca 37 #include "lwip/opt.h"
DieterGraef 0:d26c1b55cfca 38
DieterGraef 0:d26c1b55cfca 39 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
DieterGraef 0:d26c1b55cfca 40
DieterGraef 0:d26c1b55cfca 41 #include "lwip/snmp_asn1.h"
DieterGraef 0:d26c1b55cfca 42
DieterGraef 0:d26c1b55cfca 43 /**
DieterGraef 0:d26c1b55cfca 44 * Returns octet count for length.
DieterGraef 0:d26c1b55cfca 45 *
DieterGraef 0:d26c1b55cfca 46 * @param length
DieterGraef 0:d26c1b55cfca 47 * @param octets_needed points to the return value
DieterGraef 0:d26c1b55cfca 48 */
DieterGraef 0:d26c1b55cfca 49 void
DieterGraef 0:d26c1b55cfca 50 snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed)
DieterGraef 0:d26c1b55cfca 51 {
DieterGraef 0:d26c1b55cfca 52 if (length < 0x80U)
DieterGraef 0:d26c1b55cfca 53 {
DieterGraef 0:d26c1b55cfca 54 *octets_needed = 1;
DieterGraef 0:d26c1b55cfca 55 }
DieterGraef 0:d26c1b55cfca 56 else if (length < 0x100U)
DieterGraef 0:d26c1b55cfca 57 {
DieterGraef 0:d26c1b55cfca 58 *octets_needed = 2;
DieterGraef 0:d26c1b55cfca 59 }
DieterGraef 0:d26c1b55cfca 60 else
DieterGraef 0:d26c1b55cfca 61 {
DieterGraef 0:d26c1b55cfca 62 *octets_needed = 3;
DieterGraef 0:d26c1b55cfca 63 }
DieterGraef 0:d26c1b55cfca 64 }
DieterGraef 0:d26c1b55cfca 65
DieterGraef 0:d26c1b55cfca 66 /**
DieterGraef 0:d26c1b55cfca 67 * Returns octet count for an u32_t.
DieterGraef 0:d26c1b55cfca 68 *
DieterGraef 0:d26c1b55cfca 69 * @param value
DieterGraef 0:d26c1b55cfca 70 * @param octets_needed points to the return value
DieterGraef 0:d26c1b55cfca 71 *
DieterGraef 0:d26c1b55cfca 72 * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded
DieterGraef 0:d26c1b55cfca 73 * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value
DieterGraef 0:d26c1b55cfca 74 * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!!
DieterGraef 0:d26c1b55cfca 75 */
DieterGraef 0:d26c1b55cfca 76 void
DieterGraef 0:d26c1b55cfca 77 snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed)
DieterGraef 0:d26c1b55cfca 78 {
DieterGraef 0:d26c1b55cfca 79 if (value < 0x80UL)
DieterGraef 0:d26c1b55cfca 80 {
DieterGraef 0:d26c1b55cfca 81 *octets_needed = 1;
DieterGraef 0:d26c1b55cfca 82 }
DieterGraef 0:d26c1b55cfca 83 else if (value < 0x8000UL)
DieterGraef 0:d26c1b55cfca 84 {
DieterGraef 0:d26c1b55cfca 85 *octets_needed = 2;
DieterGraef 0:d26c1b55cfca 86 }
DieterGraef 0:d26c1b55cfca 87 else if (value < 0x800000UL)
DieterGraef 0:d26c1b55cfca 88 {
DieterGraef 0:d26c1b55cfca 89 *octets_needed = 3;
DieterGraef 0:d26c1b55cfca 90 }
DieterGraef 0:d26c1b55cfca 91 else if (value < 0x80000000UL)
DieterGraef 0:d26c1b55cfca 92 {
DieterGraef 0:d26c1b55cfca 93 *octets_needed = 4;
DieterGraef 0:d26c1b55cfca 94 }
DieterGraef 0:d26c1b55cfca 95 else
DieterGraef 0:d26c1b55cfca 96 {
DieterGraef 0:d26c1b55cfca 97 *octets_needed = 5;
DieterGraef 0:d26c1b55cfca 98 }
DieterGraef 0:d26c1b55cfca 99 }
DieterGraef 0:d26c1b55cfca 100
DieterGraef 0:d26c1b55cfca 101 /**
DieterGraef 0:d26c1b55cfca 102 * Returns octet count for an s32_t.
DieterGraef 0:d26c1b55cfca 103 *
DieterGraef 0:d26c1b55cfca 104 * @param value
DieterGraef 0:d26c1b55cfca 105 * @param octets_needed points to the return value
DieterGraef 0:d26c1b55cfca 106 *
DieterGraef 0:d26c1b55cfca 107 * @note ASN coded integers are _always_ signed.
DieterGraef 0:d26c1b55cfca 108 */
DieterGraef 0:d26c1b55cfca 109 void
DieterGraef 0:d26c1b55cfca 110 snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed)
DieterGraef 0:d26c1b55cfca 111 {
DieterGraef 0:d26c1b55cfca 112 if (value < 0)
DieterGraef 0:d26c1b55cfca 113 {
DieterGraef 0:d26c1b55cfca 114 value = ~value;
DieterGraef 0:d26c1b55cfca 115 }
DieterGraef 0:d26c1b55cfca 116 if (value < 0x80L)
DieterGraef 0:d26c1b55cfca 117 {
DieterGraef 0:d26c1b55cfca 118 *octets_needed = 1;
DieterGraef 0:d26c1b55cfca 119 }
DieterGraef 0:d26c1b55cfca 120 else if (value < 0x8000L)
DieterGraef 0:d26c1b55cfca 121 {
DieterGraef 0:d26c1b55cfca 122 *octets_needed = 2;
DieterGraef 0:d26c1b55cfca 123 }
DieterGraef 0:d26c1b55cfca 124 else if (value < 0x800000L)
DieterGraef 0:d26c1b55cfca 125 {
DieterGraef 0:d26c1b55cfca 126 *octets_needed = 3;
DieterGraef 0:d26c1b55cfca 127 }
DieterGraef 0:d26c1b55cfca 128 else
DieterGraef 0:d26c1b55cfca 129 {
DieterGraef 0:d26c1b55cfca 130 *octets_needed = 4;
DieterGraef 0:d26c1b55cfca 131 }
DieterGraef 0:d26c1b55cfca 132 }
DieterGraef 0:d26c1b55cfca 133
DieterGraef 0:d26c1b55cfca 134 /**
DieterGraef 0:d26c1b55cfca 135 * Returns octet count for an object identifier.
DieterGraef 0:d26c1b55cfca 136 *
DieterGraef 0:d26c1b55cfca 137 * @param ident_len object identifier array length
DieterGraef 0:d26c1b55cfca 138 * @param ident points to object identifier array
DieterGraef 0:d26c1b55cfca 139 * @param octets_needed points to the return value
DieterGraef 0:d26c1b55cfca 140 */
DieterGraef 0:d26c1b55cfca 141 void
DieterGraef 0:d26c1b55cfca 142 snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed)
DieterGraef 0:d26c1b55cfca 143 {
DieterGraef 0:d26c1b55cfca 144 s32_t sub_id;
DieterGraef 0:d26c1b55cfca 145 u8_t cnt;
DieterGraef 0:d26c1b55cfca 146
DieterGraef 0:d26c1b55cfca 147 cnt = 0;
DieterGraef 0:d26c1b55cfca 148 if (ident_len > 1)
DieterGraef 0:d26c1b55cfca 149 {
DieterGraef 0:d26c1b55cfca 150 /* compressed prefix in one octet */
DieterGraef 0:d26c1b55cfca 151 cnt++;
DieterGraef 0:d26c1b55cfca 152 ident_len -= 2;
DieterGraef 0:d26c1b55cfca 153 ident += 2;
DieterGraef 0:d26c1b55cfca 154 }
DieterGraef 0:d26c1b55cfca 155 while(ident_len > 0)
DieterGraef 0:d26c1b55cfca 156 {
DieterGraef 0:d26c1b55cfca 157 ident_len--;
DieterGraef 0:d26c1b55cfca 158 sub_id = *ident;
DieterGraef 0:d26c1b55cfca 159
DieterGraef 0:d26c1b55cfca 160 sub_id >>= 7;
DieterGraef 0:d26c1b55cfca 161 cnt++;
DieterGraef 0:d26c1b55cfca 162 while(sub_id > 0)
DieterGraef 0:d26c1b55cfca 163 {
DieterGraef 0:d26c1b55cfca 164 sub_id >>= 7;
DieterGraef 0:d26c1b55cfca 165 cnt++;
DieterGraef 0:d26c1b55cfca 166 }
DieterGraef 0:d26c1b55cfca 167 ident++;
DieterGraef 0:d26c1b55cfca 168 }
DieterGraef 0:d26c1b55cfca 169 *octets_needed = cnt;
DieterGraef 0:d26c1b55cfca 170 }
DieterGraef 0:d26c1b55cfca 171
DieterGraef 0:d26c1b55cfca 172 /**
DieterGraef 0:d26c1b55cfca 173 * Encodes ASN type field into a pbuf chained ASN1 msg.
DieterGraef 0:d26c1b55cfca 174 *
DieterGraef 0:d26c1b55cfca 175 * @param p points to output pbuf to encode value into
DieterGraef 0:d26c1b55cfca 176 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:d26c1b55cfca 177 * @param type input ASN1 type
DieterGraef 0:d26c1b55cfca 178 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:d26c1b55cfca 179 */
DieterGraef 0:d26c1b55cfca 180 err_t
DieterGraef 0:d26c1b55cfca 181 snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type)
DieterGraef 0:d26c1b55cfca 182 {
DieterGraef 0:d26c1b55cfca 183 u16_t plen, base;
DieterGraef 0:d26c1b55cfca 184 u8_t *msg_ptr;
DieterGraef 0:d26c1b55cfca 185
DieterGraef 0:d26c1b55cfca 186 plen = 0;
DieterGraef 0:d26c1b55cfca 187 while (p != NULL)
DieterGraef 0:d26c1b55cfca 188 {
DieterGraef 0:d26c1b55cfca 189 base = plen;
DieterGraef 0:d26c1b55cfca 190 plen += p->len;
DieterGraef 0:d26c1b55cfca 191 if (ofs < plen)
DieterGraef 0:d26c1b55cfca 192 {
DieterGraef 0:d26c1b55cfca 193 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 194 msg_ptr += ofs - base;
DieterGraef 0:d26c1b55cfca 195 *msg_ptr = type;
DieterGraef 0:d26c1b55cfca 196 return ERR_OK;
DieterGraef 0:d26c1b55cfca 197 }
DieterGraef 0:d26c1b55cfca 198 p = p->next;
DieterGraef 0:d26c1b55cfca 199 }
DieterGraef 0:d26c1b55cfca 200 /* p == NULL, ofs >= plen */
DieterGraef 0:d26c1b55cfca 201 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 202 }
DieterGraef 0:d26c1b55cfca 203
DieterGraef 0:d26c1b55cfca 204 /**
DieterGraef 0:d26c1b55cfca 205 * Encodes host order length field into a pbuf chained ASN1 msg.
DieterGraef 0:d26c1b55cfca 206 *
DieterGraef 0:d26c1b55cfca 207 * @param p points to output pbuf to encode length into
DieterGraef 0:d26c1b55cfca 208 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:d26c1b55cfca 209 * @param length is the host order length to be encoded
DieterGraef 0:d26c1b55cfca 210 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:d26c1b55cfca 211 */
DieterGraef 0:d26c1b55cfca 212 err_t
DieterGraef 0:d26c1b55cfca 213 snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length)
DieterGraef 0:d26c1b55cfca 214 {
DieterGraef 0:d26c1b55cfca 215 u16_t plen, base;
DieterGraef 0:d26c1b55cfca 216 u8_t *msg_ptr;
DieterGraef 0:d26c1b55cfca 217
DieterGraef 0:d26c1b55cfca 218 plen = 0;
DieterGraef 0:d26c1b55cfca 219 while (p != NULL)
DieterGraef 0:d26c1b55cfca 220 {
DieterGraef 0:d26c1b55cfca 221 base = plen;
DieterGraef 0:d26c1b55cfca 222 plen += p->len;
DieterGraef 0:d26c1b55cfca 223 if (ofs < plen)
DieterGraef 0:d26c1b55cfca 224 {
DieterGraef 0:d26c1b55cfca 225 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 226 msg_ptr += ofs - base;
DieterGraef 0:d26c1b55cfca 227
DieterGraef 0:d26c1b55cfca 228 if (length < 0x80)
DieterGraef 0:d26c1b55cfca 229 {
DieterGraef 0:d26c1b55cfca 230 *msg_ptr = (u8_t)length;
DieterGraef 0:d26c1b55cfca 231 return ERR_OK;
DieterGraef 0:d26c1b55cfca 232 }
DieterGraef 0:d26c1b55cfca 233 else if (length < 0x100)
DieterGraef 0:d26c1b55cfca 234 {
DieterGraef 0:d26c1b55cfca 235 *msg_ptr = 0x81;
DieterGraef 0:d26c1b55cfca 236 ofs += 1;
DieterGraef 0:d26c1b55cfca 237 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 238 {
DieterGraef 0:d26c1b55cfca 239 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 240 p = p->next;
DieterGraef 0:d26c1b55cfca 241 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 242 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 243 }
DieterGraef 0:d26c1b55cfca 244 else
DieterGraef 0:d26c1b55cfca 245 {
DieterGraef 0:d26c1b55cfca 246 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 247 msg_ptr++;
DieterGraef 0:d26c1b55cfca 248 }
DieterGraef 0:d26c1b55cfca 249 *msg_ptr = (u8_t)length;
DieterGraef 0:d26c1b55cfca 250 return ERR_OK;
DieterGraef 0:d26c1b55cfca 251 }
DieterGraef 0:d26c1b55cfca 252 else
DieterGraef 0:d26c1b55cfca 253 {
DieterGraef 0:d26c1b55cfca 254 u8_t i;
DieterGraef 0:d26c1b55cfca 255
DieterGraef 0:d26c1b55cfca 256 /* length >= 0x100 && length <= 0xFFFF */
DieterGraef 0:d26c1b55cfca 257 *msg_ptr = 0x82;
DieterGraef 0:d26c1b55cfca 258 i = 2;
DieterGraef 0:d26c1b55cfca 259 while (i > 0)
DieterGraef 0:d26c1b55cfca 260 {
DieterGraef 0:d26c1b55cfca 261 i--;
DieterGraef 0:d26c1b55cfca 262 ofs += 1;
DieterGraef 0:d26c1b55cfca 263 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 264 {
DieterGraef 0:d26c1b55cfca 265 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 266 p = p->next;
DieterGraef 0:d26c1b55cfca 267 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 268 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 269 plen += p->len;
DieterGraef 0:d26c1b55cfca 270 }
DieterGraef 0:d26c1b55cfca 271 else
DieterGraef 0:d26c1b55cfca 272 {
DieterGraef 0:d26c1b55cfca 273 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 274 msg_ptr++;
DieterGraef 0:d26c1b55cfca 275 }
DieterGraef 0:d26c1b55cfca 276 if (i == 0)
DieterGraef 0:d26c1b55cfca 277 {
DieterGraef 0:d26c1b55cfca 278 /* least significant length octet */
DieterGraef 0:d26c1b55cfca 279 *msg_ptr = (u8_t)length;
DieterGraef 0:d26c1b55cfca 280 }
DieterGraef 0:d26c1b55cfca 281 else
DieterGraef 0:d26c1b55cfca 282 {
DieterGraef 0:d26c1b55cfca 283 /* most significant length octet */
DieterGraef 0:d26c1b55cfca 284 *msg_ptr = (u8_t)(length >> 8);
DieterGraef 0:d26c1b55cfca 285 }
DieterGraef 0:d26c1b55cfca 286 }
DieterGraef 0:d26c1b55cfca 287 return ERR_OK;
DieterGraef 0:d26c1b55cfca 288 }
DieterGraef 0:d26c1b55cfca 289 }
DieterGraef 0:d26c1b55cfca 290 p = p->next;
DieterGraef 0:d26c1b55cfca 291 }
DieterGraef 0:d26c1b55cfca 292 /* p == NULL, ofs >= plen */
DieterGraef 0:d26c1b55cfca 293 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 294 }
DieterGraef 0:d26c1b55cfca 295
DieterGraef 0:d26c1b55cfca 296 /**
DieterGraef 0:d26c1b55cfca 297 * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg.
DieterGraef 0:d26c1b55cfca 298 *
DieterGraef 0:d26c1b55cfca 299 * @param p points to output pbuf to encode value into
DieterGraef 0:d26c1b55cfca 300 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:d26c1b55cfca 301 * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt())
DieterGraef 0:d26c1b55cfca 302 * @param value is the host order u32_t value to be encoded
DieterGraef 0:d26c1b55cfca 303 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:d26c1b55cfca 304 *
DieterGraef 0:d26c1b55cfca 305 * @see snmp_asn1_enc_u32t_cnt()
DieterGraef 0:d26c1b55cfca 306 */
DieterGraef 0:d26c1b55cfca 307 err_t
DieterGraef 0:d26c1b55cfca 308 snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value)
DieterGraef 0:d26c1b55cfca 309 {
DieterGraef 0:d26c1b55cfca 310 u16_t plen, base;
DieterGraef 0:d26c1b55cfca 311 u8_t *msg_ptr;
DieterGraef 0:d26c1b55cfca 312
DieterGraef 0:d26c1b55cfca 313 plen = 0;
DieterGraef 0:d26c1b55cfca 314 while (p != NULL)
DieterGraef 0:d26c1b55cfca 315 {
DieterGraef 0:d26c1b55cfca 316 base = plen;
DieterGraef 0:d26c1b55cfca 317 plen += p->len;
DieterGraef 0:d26c1b55cfca 318 if (ofs < plen)
DieterGraef 0:d26c1b55cfca 319 {
DieterGraef 0:d26c1b55cfca 320 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 321 msg_ptr += ofs - base;
DieterGraef 0:d26c1b55cfca 322
DieterGraef 0:d26c1b55cfca 323 if (octets_needed == 5)
DieterGraef 0:d26c1b55cfca 324 {
DieterGraef 0:d26c1b55cfca 325 /* not enough bits in 'value' add leading 0x00 */
DieterGraef 0:d26c1b55cfca 326 octets_needed--;
DieterGraef 0:d26c1b55cfca 327 *msg_ptr = 0x00;
DieterGraef 0:d26c1b55cfca 328 ofs += 1;
DieterGraef 0:d26c1b55cfca 329 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 330 {
DieterGraef 0:d26c1b55cfca 331 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 332 p = p->next;
DieterGraef 0:d26c1b55cfca 333 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 334 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 335 plen += p->len;
DieterGraef 0:d26c1b55cfca 336 }
DieterGraef 0:d26c1b55cfca 337 else
DieterGraef 0:d26c1b55cfca 338 {
DieterGraef 0:d26c1b55cfca 339 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 340 msg_ptr++;
DieterGraef 0:d26c1b55cfca 341 }
DieterGraef 0:d26c1b55cfca 342 }
DieterGraef 0:d26c1b55cfca 343 while (octets_needed > 1)
DieterGraef 0:d26c1b55cfca 344 {
DieterGraef 0:d26c1b55cfca 345 octets_needed--;
DieterGraef 0:d26c1b55cfca 346 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
DieterGraef 0:d26c1b55cfca 347 ofs += 1;
DieterGraef 0:d26c1b55cfca 348 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 349 {
DieterGraef 0:d26c1b55cfca 350 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 351 p = p->next;
DieterGraef 0:d26c1b55cfca 352 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 353 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 354 plen += p->len;
DieterGraef 0:d26c1b55cfca 355 }
DieterGraef 0:d26c1b55cfca 356 else
DieterGraef 0:d26c1b55cfca 357 {
DieterGraef 0:d26c1b55cfca 358 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 359 msg_ptr++;
DieterGraef 0:d26c1b55cfca 360 }
DieterGraef 0:d26c1b55cfca 361 }
DieterGraef 0:d26c1b55cfca 362 /* (only) one least significant octet */
DieterGraef 0:d26c1b55cfca 363 *msg_ptr = (u8_t)value;
DieterGraef 0:d26c1b55cfca 364 return ERR_OK;
DieterGraef 0:d26c1b55cfca 365 }
DieterGraef 0:d26c1b55cfca 366 p = p->next;
DieterGraef 0:d26c1b55cfca 367 }
DieterGraef 0:d26c1b55cfca 368 /* p == NULL, ofs >= plen */
DieterGraef 0:d26c1b55cfca 369 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 370 }
DieterGraef 0:d26c1b55cfca 371
DieterGraef 0:d26c1b55cfca 372 /**
DieterGraef 0:d26c1b55cfca 373 * Encodes s32_t integer into a pbuf chained ASN1 msg.
DieterGraef 0:d26c1b55cfca 374 *
DieterGraef 0:d26c1b55cfca 375 * @param p points to output pbuf to encode value into
DieterGraef 0:d26c1b55cfca 376 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:d26c1b55cfca 377 * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt())
DieterGraef 0:d26c1b55cfca 378 * @param value is the host order s32_t value to be encoded
DieterGraef 0:d26c1b55cfca 379 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:d26c1b55cfca 380 *
DieterGraef 0:d26c1b55cfca 381 * @see snmp_asn1_enc_s32t_cnt()
DieterGraef 0:d26c1b55cfca 382 */
DieterGraef 0:d26c1b55cfca 383 err_t
DieterGraef 0:d26c1b55cfca 384 snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value)
DieterGraef 0:d26c1b55cfca 385 {
DieterGraef 0:d26c1b55cfca 386 u16_t plen, base;
DieterGraef 0:d26c1b55cfca 387 u8_t *msg_ptr;
DieterGraef 0:d26c1b55cfca 388
DieterGraef 0:d26c1b55cfca 389 plen = 0;
DieterGraef 0:d26c1b55cfca 390 while (p != NULL)
DieterGraef 0:d26c1b55cfca 391 {
DieterGraef 0:d26c1b55cfca 392 base = plen;
DieterGraef 0:d26c1b55cfca 393 plen += p->len;
DieterGraef 0:d26c1b55cfca 394 if (ofs < plen)
DieterGraef 0:d26c1b55cfca 395 {
DieterGraef 0:d26c1b55cfca 396 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 397 msg_ptr += ofs - base;
DieterGraef 0:d26c1b55cfca 398
DieterGraef 0:d26c1b55cfca 399 while (octets_needed > 1)
DieterGraef 0:d26c1b55cfca 400 {
DieterGraef 0:d26c1b55cfca 401 octets_needed--;
DieterGraef 0:d26c1b55cfca 402 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
DieterGraef 0:d26c1b55cfca 403 ofs += 1;
DieterGraef 0:d26c1b55cfca 404 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 405 {
DieterGraef 0:d26c1b55cfca 406 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 407 p = p->next;
DieterGraef 0:d26c1b55cfca 408 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 409 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 410 plen += p->len;
DieterGraef 0:d26c1b55cfca 411 }
DieterGraef 0:d26c1b55cfca 412 else
DieterGraef 0:d26c1b55cfca 413 {
DieterGraef 0:d26c1b55cfca 414 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 415 msg_ptr++;
DieterGraef 0:d26c1b55cfca 416 }
DieterGraef 0:d26c1b55cfca 417 }
DieterGraef 0:d26c1b55cfca 418 /* (only) one least significant octet */
DieterGraef 0:d26c1b55cfca 419 *msg_ptr = (u8_t)value;
DieterGraef 0:d26c1b55cfca 420 return ERR_OK;
DieterGraef 0:d26c1b55cfca 421 }
DieterGraef 0:d26c1b55cfca 422 p = p->next;
DieterGraef 0:d26c1b55cfca 423 }
DieterGraef 0:d26c1b55cfca 424 /* p == NULL, ofs >= plen */
DieterGraef 0:d26c1b55cfca 425 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 426 }
DieterGraef 0:d26c1b55cfca 427
DieterGraef 0:d26c1b55cfca 428 /**
DieterGraef 0:d26c1b55cfca 429 * Encodes object identifier into a pbuf chained ASN1 msg.
DieterGraef 0:d26c1b55cfca 430 *
DieterGraef 0:d26c1b55cfca 431 * @param p points to output pbuf to encode oid into
DieterGraef 0:d26c1b55cfca 432 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:d26c1b55cfca 433 * @param ident_len object identifier array length
DieterGraef 0:d26c1b55cfca 434 * @param ident points to object identifier array
DieterGraef 0:d26c1b55cfca 435 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:d26c1b55cfca 436 */
DieterGraef 0:d26c1b55cfca 437 err_t
DieterGraef 0:d26c1b55cfca 438 snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident)
DieterGraef 0:d26c1b55cfca 439 {
DieterGraef 0:d26c1b55cfca 440 u16_t plen, base;
DieterGraef 0:d26c1b55cfca 441 u8_t *msg_ptr;
DieterGraef 0:d26c1b55cfca 442
DieterGraef 0:d26c1b55cfca 443 plen = 0;
DieterGraef 0:d26c1b55cfca 444 while (p != NULL)
DieterGraef 0:d26c1b55cfca 445 {
DieterGraef 0:d26c1b55cfca 446 base = plen;
DieterGraef 0:d26c1b55cfca 447 plen += p->len;
DieterGraef 0:d26c1b55cfca 448 if (ofs < plen)
DieterGraef 0:d26c1b55cfca 449 {
DieterGraef 0:d26c1b55cfca 450 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 451 msg_ptr += ofs - base;
DieterGraef 0:d26c1b55cfca 452
DieterGraef 0:d26c1b55cfca 453 if (ident_len > 1)
DieterGraef 0:d26c1b55cfca 454 {
DieterGraef 0:d26c1b55cfca 455 if ((ident[0] == 1) && (ident[1] == 3))
DieterGraef 0:d26c1b55cfca 456 {
DieterGraef 0:d26c1b55cfca 457 /* compressed (most common) prefix .iso.org */
DieterGraef 0:d26c1b55cfca 458 *msg_ptr = 0x2b;
DieterGraef 0:d26c1b55cfca 459 }
DieterGraef 0:d26c1b55cfca 460 else
DieterGraef 0:d26c1b55cfca 461 {
DieterGraef 0:d26c1b55cfca 462 /* calculate prefix */
DieterGraef 0:d26c1b55cfca 463 *msg_ptr = (u8_t)((ident[0] * 40) + ident[1]);
DieterGraef 0:d26c1b55cfca 464 }
DieterGraef 0:d26c1b55cfca 465 ofs += 1;
DieterGraef 0:d26c1b55cfca 466 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 467 {
DieterGraef 0:d26c1b55cfca 468 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 469 p = p->next;
DieterGraef 0:d26c1b55cfca 470 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 471 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 472 plen += p->len;
DieterGraef 0:d26c1b55cfca 473 }
DieterGraef 0:d26c1b55cfca 474 else
DieterGraef 0:d26c1b55cfca 475 {
DieterGraef 0:d26c1b55cfca 476 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 477 msg_ptr++;
DieterGraef 0:d26c1b55cfca 478 }
DieterGraef 0:d26c1b55cfca 479 ident_len -= 2;
DieterGraef 0:d26c1b55cfca 480 ident += 2;
DieterGraef 0:d26c1b55cfca 481 }
DieterGraef 0:d26c1b55cfca 482 else
DieterGraef 0:d26c1b55cfca 483 {
DieterGraef 0:d26c1b55cfca 484 /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */
DieterGraef 0:d26c1b55cfca 485 /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */
DieterGraef 0:d26c1b55cfca 486 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 487 }
DieterGraef 0:d26c1b55cfca 488 while (ident_len > 0)
DieterGraef 0:d26c1b55cfca 489 {
DieterGraef 0:d26c1b55cfca 490 s32_t sub_id;
DieterGraef 0:d26c1b55cfca 491 u8_t shift, tail;
DieterGraef 0:d26c1b55cfca 492
DieterGraef 0:d26c1b55cfca 493 ident_len--;
DieterGraef 0:d26c1b55cfca 494 sub_id = *ident;
DieterGraef 0:d26c1b55cfca 495 tail = 0;
DieterGraef 0:d26c1b55cfca 496 shift = 28;
DieterGraef 0:d26c1b55cfca 497 while(shift > 0)
DieterGraef 0:d26c1b55cfca 498 {
DieterGraef 0:d26c1b55cfca 499 u8_t code;
DieterGraef 0:d26c1b55cfca 500
DieterGraef 0:d26c1b55cfca 501 code = (u8_t)(sub_id >> shift);
DieterGraef 0:d26c1b55cfca 502 if ((code != 0) || (tail != 0))
DieterGraef 0:d26c1b55cfca 503 {
DieterGraef 0:d26c1b55cfca 504 tail = 1;
DieterGraef 0:d26c1b55cfca 505 *msg_ptr = code | 0x80;
DieterGraef 0:d26c1b55cfca 506 ofs += 1;
DieterGraef 0:d26c1b55cfca 507 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 508 {
DieterGraef 0:d26c1b55cfca 509 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 510 p = p->next;
DieterGraef 0:d26c1b55cfca 511 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 512 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 513 plen += p->len;
DieterGraef 0:d26c1b55cfca 514 }
DieterGraef 0:d26c1b55cfca 515 else
DieterGraef 0:d26c1b55cfca 516 {
DieterGraef 0:d26c1b55cfca 517 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 518 msg_ptr++;
DieterGraef 0:d26c1b55cfca 519 }
DieterGraef 0:d26c1b55cfca 520 }
DieterGraef 0:d26c1b55cfca 521 shift -= 7;
DieterGraef 0:d26c1b55cfca 522 }
DieterGraef 0:d26c1b55cfca 523 *msg_ptr = (u8_t)sub_id & 0x7F;
DieterGraef 0:d26c1b55cfca 524 if (ident_len > 0)
DieterGraef 0:d26c1b55cfca 525 {
DieterGraef 0:d26c1b55cfca 526 ofs += 1;
DieterGraef 0:d26c1b55cfca 527 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 528 {
DieterGraef 0:d26c1b55cfca 529 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 530 p = p->next;
DieterGraef 0:d26c1b55cfca 531 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 532 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 533 plen += p->len;
DieterGraef 0:d26c1b55cfca 534 }
DieterGraef 0:d26c1b55cfca 535 else
DieterGraef 0:d26c1b55cfca 536 {
DieterGraef 0:d26c1b55cfca 537 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 538 msg_ptr++;
DieterGraef 0:d26c1b55cfca 539 }
DieterGraef 0:d26c1b55cfca 540 }
DieterGraef 0:d26c1b55cfca 541 /* proceed to next sub-identifier */
DieterGraef 0:d26c1b55cfca 542 ident++;
DieterGraef 0:d26c1b55cfca 543 }
DieterGraef 0:d26c1b55cfca 544 return ERR_OK;
DieterGraef 0:d26c1b55cfca 545 }
DieterGraef 0:d26c1b55cfca 546 p = p->next;
DieterGraef 0:d26c1b55cfca 547 }
DieterGraef 0:d26c1b55cfca 548 /* p == NULL, ofs >= plen */
DieterGraef 0:d26c1b55cfca 549 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 550 }
DieterGraef 0:d26c1b55cfca 551
DieterGraef 0:d26c1b55cfca 552 /**
DieterGraef 0:d26c1b55cfca 553 * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg.
DieterGraef 0:d26c1b55cfca 554 *
DieterGraef 0:d26c1b55cfca 555 * @param p points to output pbuf to encode raw data into
DieterGraef 0:d26c1b55cfca 556 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:d26c1b55cfca 557 * @param raw_len raw data length
DieterGraef 0:d26c1b55cfca 558 * @param raw points raw data
DieterGraef 0:d26c1b55cfca 559 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:d26c1b55cfca 560 */
DieterGraef 0:d26c1b55cfca 561 err_t
DieterGraef 0:d26c1b55cfca 562 snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw)
DieterGraef 0:d26c1b55cfca 563 {
DieterGraef 0:d26c1b55cfca 564 u16_t plen, base;
DieterGraef 0:d26c1b55cfca 565 u8_t *msg_ptr;
DieterGraef 0:d26c1b55cfca 566
DieterGraef 0:d26c1b55cfca 567 plen = 0;
DieterGraef 0:d26c1b55cfca 568 while (p != NULL)
DieterGraef 0:d26c1b55cfca 569 {
DieterGraef 0:d26c1b55cfca 570 base = plen;
DieterGraef 0:d26c1b55cfca 571 plen += p->len;
DieterGraef 0:d26c1b55cfca 572 if (ofs < plen)
DieterGraef 0:d26c1b55cfca 573 {
DieterGraef 0:d26c1b55cfca 574 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 575 msg_ptr += ofs - base;
DieterGraef 0:d26c1b55cfca 576
DieterGraef 0:d26c1b55cfca 577 while (raw_len > 1)
DieterGraef 0:d26c1b55cfca 578 {
DieterGraef 0:d26c1b55cfca 579 /* copy raw_len - 1 octets */
DieterGraef 0:d26c1b55cfca 580 raw_len--;
DieterGraef 0:d26c1b55cfca 581 *msg_ptr = *raw;
DieterGraef 0:d26c1b55cfca 582 raw++;
DieterGraef 0:d26c1b55cfca 583 ofs += 1;
DieterGraef 0:d26c1b55cfca 584 if (ofs >= plen)
DieterGraef 0:d26c1b55cfca 585 {
DieterGraef 0:d26c1b55cfca 586 /* next octet in next pbuf */
DieterGraef 0:d26c1b55cfca 587 p = p->next;
DieterGraef 0:d26c1b55cfca 588 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:d26c1b55cfca 589 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:d26c1b55cfca 590 plen += p->len;
DieterGraef 0:d26c1b55cfca 591 }
DieterGraef 0:d26c1b55cfca 592 else
DieterGraef 0:d26c1b55cfca 593 {
DieterGraef 0:d26c1b55cfca 594 /* next octet in same pbuf */
DieterGraef 0:d26c1b55cfca 595 msg_ptr++;
DieterGraef 0:d26c1b55cfca 596 }
DieterGraef 0:d26c1b55cfca 597 }
DieterGraef 0:d26c1b55cfca 598 if (raw_len > 0)
DieterGraef 0:d26c1b55cfca 599 {
DieterGraef 0:d26c1b55cfca 600 /* copy last or single octet */
DieterGraef 0:d26c1b55cfca 601 *msg_ptr = *raw;
DieterGraef 0:d26c1b55cfca 602 }
DieterGraef 0:d26c1b55cfca 603 return ERR_OK;
DieterGraef 0:d26c1b55cfca 604 }
DieterGraef 0:d26c1b55cfca 605 p = p->next;
DieterGraef 0:d26c1b55cfca 606 }
DieterGraef 0:d26c1b55cfca 607 /* p == NULL, ofs >= plen */
DieterGraef 0:d26c1b55cfca 608 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 609 }
DieterGraef 0:d26c1b55cfca 610
DieterGraef 0:d26c1b55cfca 611 #endif /* LWIP_SNMP */