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ProjetoBB

Dependencies:   F7_Ethernet WebSocketClient mbed mcp3008

Fork of Nucleo_F746ZG_Ethernet by Dieter Graef

F7_Ethernet/lwip/core/snmp/asn1_enc.c@0:f9b6112278fe, 2016-06-18 (annotated)

Committer:
DieterGraef
Date:
Sat Jun 18 10:49:12 2016 +0000
Revision:
0:f9b6112278fe
Ethernet for the NUCLEO STM32F746 Board Testprogram uses DHCP and NTP to set the clock

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:f9b6112278fe 1 /**
DieterGraef 0:f9b6112278fe 2 * @file
DieterGraef 0:f9b6112278fe 3 * Abstract Syntax Notation One (ISO 8824, 8825) encoding
DieterGraef 0:f9b6112278fe 4 *
DieterGraef 0:f9b6112278fe 5 * @todo not optimised (yet), favor correctness over speed, favor speed over size
DieterGraef 0:f9b6112278fe 6 */
DieterGraef 0:f9b6112278fe 7
DieterGraef 0:f9b6112278fe 8 /*
DieterGraef 0:f9b6112278fe 9 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
DieterGraef 0:f9b6112278fe 10 * All rights reserved.
DieterGraef 0:f9b6112278fe 11 *
DieterGraef 0:f9b6112278fe 12 * Redistribution and use in source and binary forms, with or without modification,
DieterGraef 0:f9b6112278fe 13 * are permitted provided that the following conditions are met:
DieterGraef 0:f9b6112278fe 14 *
DieterGraef 0:f9b6112278fe 15 * 1. Redistributions of source code must retain the above copyright notice,
DieterGraef 0:f9b6112278fe 16 * this list of conditions and the following disclaimer.
DieterGraef 0:f9b6112278fe 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
DieterGraef 0:f9b6112278fe 18 * this list of conditions and the following disclaimer in the documentation
DieterGraef 0:f9b6112278fe 19 * and/or other materials provided with the distribution.
DieterGraef 0:f9b6112278fe 20 * 3. The name of the author may not be used to endorse or promote products
DieterGraef 0:f9b6112278fe 21 * derived from this software without specific prior written permission.
DieterGraef 0:f9b6112278fe 22 *
DieterGraef 0:f9b6112278fe 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
DieterGraef 0:f9b6112278fe 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
DieterGraef 0:f9b6112278fe 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
DieterGraef 0:f9b6112278fe 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
DieterGraef 0:f9b6112278fe 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
DieterGraef 0:f9b6112278fe 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
DieterGraef 0:f9b6112278fe 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
DieterGraef 0:f9b6112278fe 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
DieterGraef 0:f9b6112278fe 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
DieterGraef 0:f9b6112278fe 32 * OF SUCH DAMAGE.
DieterGraef 0:f9b6112278fe 33 *
DieterGraef 0:f9b6112278fe 34 * Author: Christiaan Simons <christiaan.simons@axon.tv>
DieterGraef 0:f9b6112278fe 35 */
DieterGraef 0:f9b6112278fe 36
DieterGraef 0:f9b6112278fe 37 #include "lwip/opt.h"
DieterGraef 0:f9b6112278fe 38
DieterGraef 0:f9b6112278fe 39 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
DieterGraef 0:f9b6112278fe 40
DieterGraef 0:f9b6112278fe 41 #include "lwip/snmp_asn1.h"
DieterGraef 0:f9b6112278fe 42
DieterGraef 0:f9b6112278fe 43 /**
DieterGraef 0:f9b6112278fe 44 * Returns octet count for length.
DieterGraef 0:f9b6112278fe 45 *
DieterGraef 0:f9b6112278fe 46 * @param length
DieterGraef 0:f9b6112278fe 47 * @param octets_needed points to the return value
DieterGraef 0:f9b6112278fe 48 */
DieterGraef 0:f9b6112278fe 49 void
DieterGraef 0:f9b6112278fe 50 snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed)
DieterGraef 0:f9b6112278fe 51 {
DieterGraef 0:f9b6112278fe 52 if (length < 0x80U)
DieterGraef 0:f9b6112278fe 53 {
DieterGraef 0:f9b6112278fe 54 *octets_needed = 1;
DieterGraef 0:f9b6112278fe 55 }
DieterGraef 0:f9b6112278fe 56 else if (length < 0x100U)
DieterGraef 0:f9b6112278fe 57 {
DieterGraef 0:f9b6112278fe 58 *octets_needed = 2;
DieterGraef 0:f9b6112278fe 59 }
DieterGraef 0:f9b6112278fe 60 else
DieterGraef 0:f9b6112278fe 61 {
DieterGraef 0:f9b6112278fe 62 *octets_needed = 3;
DieterGraef 0:f9b6112278fe 63 }
DieterGraef 0:f9b6112278fe 64 }
DieterGraef 0:f9b6112278fe 65
DieterGraef 0:f9b6112278fe 66 /**
DieterGraef 0:f9b6112278fe 67 * Returns octet count for an u32_t.
DieterGraef 0:f9b6112278fe 68 *
DieterGraef 0:f9b6112278fe 69 * @param value
DieterGraef 0:f9b6112278fe 70 * @param octets_needed points to the return value
DieterGraef 0:f9b6112278fe 71 *
DieterGraef 0:f9b6112278fe 72 * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded
DieterGraef 0:f9b6112278fe 73 * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value
DieterGraef 0:f9b6112278fe 74 * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!!
DieterGraef 0:f9b6112278fe 75 */
DieterGraef 0:f9b6112278fe 76 void
DieterGraef 0:f9b6112278fe 77 snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed)
DieterGraef 0:f9b6112278fe 78 {
DieterGraef 0:f9b6112278fe 79 if (value < 0x80UL)
DieterGraef 0:f9b6112278fe 80 {
DieterGraef 0:f9b6112278fe 81 *octets_needed = 1;
DieterGraef 0:f9b6112278fe 82 }
DieterGraef 0:f9b6112278fe 83 else if (value < 0x8000UL)
DieterGraef 0:f9b6112278fe 84 {
DieterGraef 0:f9b6112278fe 85 *octets_needed = 2;
DieterGraef 0:f9b6112278fe 86 }
DieterGraef 0:f9b6112278fe 87 else if (value < 0x800000UL)
DieterGraef 0:f9b6112278fe 88 {
DieterGraef 0:f9b6112278fe 89 *octets_needed = 3;
DieterGraef 0:f9b6112278fe 90 }
DieterGraef 0:f9b6112278fe 91 else if (value < 0x80000000UL)
DieterGraef 0:f9b6112278fe 92 {
DieterGraef 0:f9b6112278fe 93 *octets_needed = 4;
DieterGraef 0:f9b6112278fe 94 }
DieterGraef 0:f9b6112278fe 95 else
DieterGraef 0:f9b6112278fe 96 {
DieterGraef 0:f9b6112278fe 97 *octets_needed = 5;
DieterGraef 0:f9b6112278fe 98 }
DieterGraef 0:f9b6112278fe 99 }
DieterGraef 0:f9b6112278fe 100
DieterGraef 0:f9b6112278fe 101 /**
DieterGraef 0:f9b6112278fe 102 * Returns octet count for an s32_t.
DieterGraef 0:f9b6112278fe 103 *
DieterGraef 0:f9b6112278fe 104 * @param value
DieterGraef 0:f9b6112278fe 105 * @param octets_needed points to the return value
DieterGraef 0:f9b6112278fe 106 *
DieterGraef 0:f9b6112278fe 107 * @note ASN coded integers are _always_ signed.
DieterGraef 0:f9b6112278fe 108 */
DieterGraef 0:f9b6112278fe 109 void
DieterGraef 0:f9b6112278fe 110 snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed)
DieterGraef 0:f9b6112278fe 111 {
DieterGraef 0:f9b6112278fe 112 if (value < 0)
DieterGraef 0:f9b6112278fe 113 {
DieterGraef 0:f9b6112278fe 114 value = ~value;
DieterGraef 0:f9b6112278fe 115 }
DieterGraef 0:f9b6112278fe 116 if (value < 0x80L)
DieterGraef 0:f9b6112278fe 117 {
DieterGraef 0:f9b6112278fe 118 *octets_needed = 1;
DieterGraef 0:f9b6112278fe 119 }
DieterGraef 0:f9b6112278fe 120 else if (value < 0x8000L)
DieterGraef 0:f9b6112278fe 121 {
DieterGraef 0:f9b6112278fe 122 *octets_needed = 2;
DieterGraef 0:f9b6112278fe 123 }
DieterGraef 0:f9b6112278fe 124 else if (value < 0x800000L)
DieterGraef 0:f9b6112278fe 125 {
DieterGraef 0:f9b6112278fe 126 *octets_needed = 3;
DieterGraef 0:f9b6112278fe 127 }
DieterGraef 0:f9b6112278fe 128 else
DieterGraef 0:f9b6112278fe 129 {
DieterGraef 0:f9b6112278fe 130 *octets_needed = 4;
DieterGraef 0:f9b6112278fe 131 }
DieterGraef 0:f9b6112278fe 132 }
DieterGraef 0:f9b6112278fe 133
DieterGraef 0:f9b6112278fe 134 /**
DieterGraef 0:f9b6112278fe 135 * Returns octet count for an object identifier.
DieterGraef 0:f9b6112278fe 136 *
DieterGraef 0:f9b6112278fe 137 * @param ident_len object identifier array length
DieterGraef 0:f9b6112278fe 138 * @param ident points to object identifier array
DieterGraef 0:f9b6112278fe 139 * @param octets_needed points to the return value
DieterGraef 0:f9b6112278fe 140 */
DieterGraef 0:f9b6112278fe 141 void
DieterGraef 0:f9b6112278fe 142 snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed)
DieterGraef 0:f9b6112278fe 143 {
DieterGraef 0:f9b6112278fe 144 s32_t sub_id;
DieterGraef 0:f9b6112278fe 145 u8_t cnt;
DieterGraef 0:f9b6112278fe 146
DieterGraef 0:f9b6112278fe 147 cnt = 0;
DieterGraef 0:f9b6112278fe 148 if (ident_len > 1)
DieterGraef 0:f9b6112278fe 149 {
DieterGraef 0:f9b6112278fe 150 /* compressed prefix in one octet */
DieterGraef 0:f9b6112278fe 151 cnt++;
DieterGraef 0:f9b6112278fe 152 ident_len -= 2;
DieterGraef 0:f9b6112278fe 153 ident += 2;
DieterGraef 0:f9b6112278fe 154 }
DieterGraef 0:f9b6112278fe 155 while(ident_len > 0)
DieterGraef 0:f9b6112278fe 156 {
DieterGraef 0:f9b6112278fe 157 ident_len--;
DieterGraef 0:f9b6112278fe 158 sub_id = *ident;
DieterGraef 0:f9b6112278fe 159
DieterGraef 0:f9b6112278fe 160 sub_id >>= 7;
DieterGraef 0:f9b6112278fe 161 cnt++;
DieterGraef 0:f9b6112278fe 162 while(sub_id > 0)
DieterGraef 0:f9b6112278fe 163 {
DieterGraef 0:f9b6112278fe 164 sub_id >>= 7;
DieterGraef 0:f9b6112278fe 165 cnt++;
DieterGraef 0:f9b6112278fe 166 }
DieterGraef 0:f9b6112278fe 167 ident++;
DieterGraef 0:f9b6112278fe 168 }
DieterGraef 0:f9b6112278fe 169 *octets_needed = cnt;
DieterGraef 0:f9b6112278fe 170 }
DieterGraef 0:f9b6112278fe 171
DieterGraef 0:f9b6112278fe 172 /**
DieterGraef 0:f9b6112278fe 173 * Encodes ASN type field into a pbuf chained ASN1 msg.
DieterGraef 0:f9b6112278fe 174 *
DieterGraef 0:f9b6112278fe 175 * @param p points to output pbuf to encode value into
DieterGraef 0:f9b6112278fe 176 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:f9b6112278fe 177 * @param type input ASN1 type
DieterGraef 0:f9b6112278fe 178 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:f9b6112278fe 179 */
DieterGraef 0:f9b6112278fe 180 err_t
DieterGraef 0:f9b6112278fe 181 snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type)
DieterGraef 0:f9b6112278fe 182 {
DieterGraef 0:f9b6112278fe 183 u16_t plen, base;
DieterGraef 0:f9b6112278fe 184 u8_t *msg_ptr;
DieterGraef 0:f9b6112278fe 185
DieterGraef 0:f9b6112278fe 186 plen = 0;
DieterGraef 0:f9b6112278fe 187 while (p != NULL)
DieterGraef 0:f9b6112278fe 188 {
DieterGraef 0:f9b6112278fe 189 base = plen;
DieterGraef 0:f9b6112278fe 190 plen += p->len;
DieterGraef 0:f9b6112278fe 191 if (ofs < plen)
DieterGraef 0:f9b6112278fe 192 {
DieterGraef 0:f9b6112278fe 193 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 194 msg_ptr += ofs - base;
DieterGraef 0:f9b6112278fe 195 *msg_ptr = type;
DieterGraef 0:f9b6112278fe 196 return ERR_OK;
DieterGraef 0:f9b6112278fe 197 }
DieterGraef 0:f9b6112278fe 198 p = p->next;
DieterGraef 0:f9b6112278fe 199 }
DieterGraef 0:f9b6112278fe 200 /* p == NULL, ofs >= plen */
DieterGraef 0:f9b6112278fe 201 return ERR_ARG;
DieterGraef 0:f9b6112278fe 202 }
DieterGraef 0:f9b6112278fe 203
DieterGraef 0:f9b6112278fe 204 /**
DieterGraef 0:f9b6112278fe 205 * Encodes host order length field into a pbuf chained ASN1 msg.
DieterGraef 0:f9b6112278fe 206 *
DieterGraef 0:f9b6112278fe 207 * @param p points to output pbuf to encode length into
DieterGraef 0:f9b6112278fe 208 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:f9b6112278fe 209 * @param length is the host order length to be encoded
DieterGraef 0:f9b6112278fe 210 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:f9b6112278fe 211 */
DieterGraef 0:f9b6112278fe 212 err_t
DieterGraef 0:f9b6112278fe 213 snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length)
DieterGraef 0:f9b6112278fe 214 {
DieterGraef 0:f9b6112278fe 215 u16_t plen, base;
DieterGraef 0:f9b6112278fe 216 u8_t *msg_ptr;
DieterGraef 0:f9b6112278fe 217
DieterGraef 0:f9b6112278fe 218 plen = 0;
DieterGraef 0:f9b6112278fe 219 while (p != NULL)
DieterGraef 0:f9b6112278fe 220 {
DieterGraef 0:f9b6112278fe 221 base = plen;
DieterGraef 0:f9b6112278fe 222 plen += p->len;
DieterGraef 0:f9b6112278fe 223 if (ofs < plen)
DieterGraef 0:f9b6112278fe 224 {
DieterGraef 0:f9b6112278fe 225 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 226 msg_ptr += ofs - base;
DieterGraef 0:f9b6112278fe 227
DieterGraef 0:f9b6112278fe 228 if (length < 0x80)
DieterGraef 0:f9b6112278fe 229 {
DieterGraef 0:f9b6112278fe 230 *msg_ptr = (u8_t)length;
DieterGraef 0:f9b6112278fe 231 return ERR_OK;
DieterGraef 0:f9b6112278fe 232 }
DieterGraef 0:f9b6112278fe 233 else if (length < 0x100)
DieterGraef 0:f9b6112278fe 234 {
DieterGraef 0:f9b6112278fe 235 *msg_ptr = 0x81;
DieterGraef 0:f9b6112278fe 236 ofs += 1;
DieterGraef 0:f9b6112278fe 237 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 238 {
DieterGraef 0:f9b6112278fe 239 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 240 p = p->next;
DieterGraef 0:f9b6112278fe 241 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 242 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 243 }
DieterGraef 0:f9b6112278fe 244 else
DieterGraef 0:f9b6112278fe 245 {
DieterGraef 0:f9b6112278fe 246 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 247 msg_ptr++;
DieterGraef 0:f9b6112278fe 248 }
DieterGraef 0:f9b6112278fe 249 *msg_ptr = (u8_t)length;
DieterGraef 0:f9b6112278fe 250 return ERR_OK;
DieterGraef 0:f9b6112278fe 251 }
DieterGraef 0:f9b6112278fe 252 else
DieterGraef 0:f9b6112278fe 253 {
DieterGraef 0:f9b6112278fe 254 u8_t i;
DieterGraef 0:f9b6112278fe 255
DieterGraef 0:f9b6112278fe 256 /* length >= 0x100 && length <= 0xFFFF */
DieterGraef 0:f9b6112278fe 257 *msg_ptr = 0x82;
DieterGraef 0:f9b6112278fe 258 i = 2;
DieterGraef 0:f9b6112278fe 259 while (i > 0)
DieterGraef 0:f9b6112278fe 260 {
DieterGraef 0:f9b6112278fe 261 i--;
DieterGraef 0:f9b6112278fe 262 ofs += 1;
DieterGraef 0:f9b6112278fe 263 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 264 {
DieterGraef 0:f9b6112278fe 265 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 266 p = p->next;
DieterGraef 0:f9b6112278fe 267 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 268 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 269 plen += p->len;
DieterGraef 0:f9b6112278fe 270 }
DieterGraef 0:f9b6112278fe 271 else
DieterGraef 0:f9b6112278fe 272 {
DieterGraef 0:f9b6112278fe 273 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 274 msg_ptr++;
DieterGraef 0:f9b6112278fe 275 }
DieterGraef 0:f9b6112278fe 276 if (i == 0)
DieterGraef 0:f9b6112278fe 277 {
DieterGraef 0:f9b6112278fe 278 /* least significant length octet */
DieterGraef 0:f9b6112278fe 279 *msg_ptr = (u8_t)length;
DieterGraef 0:f9b6112278fe 280 }
DieterGraef 0:f9b6112278fe 281 else
DieterGraef 0:f9b6112278fe 282 {
DieterGraef 0:f9b6112278fe 283 /* most significant length octet */
DieterGraef 0:f9b6112278fe 284 *msg_ptr = (u8_t)(length >> 8);
DieterGraef 0:f9b6112278fe 285 }
DieterGraef 0:f9b6112278fe 286 }
DieterGraef 0:f9b6112278fe 287 return ERR_OK;
DieterGraef 0:f9b6112278fe 288 }
DieterGraef 0:f9b6112278fe 289 }
DieterGraef 0:f9b6112278fe 290 p = p->next;
DieterGraef 0:f9b6112278fe 291 }
DieterGraef 0:f9b6112278fe 292 /* p == NULL, ofs >= plen */
DieterGraef 0:f9b6112278fe 293 return ERR_ARG;
DieterGraef 0:f9b6112278fe 294 }
DieterGraef 0:f9b6112278fe 295
DieterGraef 0:f9b6112278fe 296 /**
DieterGraef 0:f9b6112278fe 297 * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg.
DieterGraef 0:f9b6112278fe 298 *
DieterGraef 0:f9b6112278fe 299 * @param p points to output pbuf to encode value into
DieterGraef 0:f9b6112278fe 300 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:f9b6112278fe 301 * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt())
DieterGraef 0:f9b6112278fe 302 * @param value is the host order u32_t value to be encoded
DieterGraef 0:f9b6112278fe 303 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:f9b6112278fe 304 *
DieterGraef 0:f9b6112278fe 305 * @see snmp_asn1_enc_u32t_cnt()
DieterGraef 0:f9b6112278fe 306 */
DieterGraef 0:f9b6112278fe 307 err_t
DieterGraef 0:f9b6112278fe 308 snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value)
DieterGraef 0:f9b6112278fe 309 {
DieterGraef 0:f9b6112278fe 310 u16_t plen, base;
DieterGraef 0:f9b6112278fe 311 u8_t *msg_ptr;
DieterGraef 0:f9b6112278fe 312
DieterGraef 0:f9b6112278fe 313 plen = 0;
DieterGraef 0:f9b6112278fe 314 while (p != NULL)
DieterGraef 0:f9b6112278fe 315 {
DieterGraef 0:f9b6112278fe 316 base = plen;
DieterGraef 0:f9b6112278fe 317 plen += p->len;
DieterGraef 0:f9b6112278fe 318 if (ofs < plen)
DieterGraef 0:f9b6112278fe 319 {
DieterGraef 0:f9b6112278fe 320 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 321 msg_ptr += ofs - base;
DieterGraef 0:f9b6112278fe 322
DieterGraef 0:f9b6112278fe 323 if (octets_needed == 5)
DieterGraef 0:f9b6112278fe 324 {
DieterGraef 0:f9b6112278fe 325 /* not enough bits in 'value' add leading 0x00 */
DieterGraef 0:f9b6112278fe 326 octets_needed--;
DieterGraef 0:f9b6112278fe 327 *msg_ptr = 0x00;
DieterGraef 0:f9b6112278fe 328 ofs += 1;
DieterGraef 0:f9b6112278fe 329 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 330 {
DieterGraef 0:f9b6112278fe 331 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 332 p = p->next;
DieterGraef 0:f9b6112278fe 333 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 334 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 335 plen += p->len;
DieterGraef 0:f9b6112278fe 336 }
DieterGraef 0:f9b6112278fe 337 else
DieterGraef 0:f9b6112278fe 338 {
DieterGraef 0:f9b6112278fe 339 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 340 msg_ptr++;
DieterGraef 0:f9b6112278fe 341 }
DieterGraef 0:f9b6112278fe 342 }
DieterGraef 0:f9b6112278fe 343 while (octets_needed > 1)
DieterGraef 0:f9b6112278fe 344 {
DieterGraef 0:f9b6112278fe 345 octets_needed--;
DieterGraef 0:f9b6112278fe 346 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
DieterGraef 0:f9b6112278fe 347 ofs += 1;
DieterGraef 0:f9b6112278fe 348 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 349 {
DieterGraef 0:f9b6112278fe 350 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 351 p = p->next;
DieterGraef 0:f9b6112278fe 352 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 353 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 354 plen += p->len;
DieterGraef 0:f9b6112278fe 355 }
DieterGraef 0:f9b6112278fe 356 else
DieterGraef 0:f9b6112278fe 357 {
DieterGraef 0:f9b6112278fe 358 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 359 msg_ptr++;
DieterGraef 0:f9b6112278fe 360 }
DieterGraef 0:f9b6112278fe 361 }
DieterGraef 0:f9b6112278fe 362 /* (only) one least significant octet */
DieterGraef 0:f9b6112278fe 363 *msg_ptr = (u8_t)value;
DieterGraef 0:f9b6112278fe 364 return ERR_OK;
DieterGraef 0:f9b6112278fe 365 }
DieterGraef 0:f9b6112278fe 366 p = p->next;
DieterGraef 0:f9b6112278fe 367 }
DieterGraef 0:f9b6112278fe 368 /* p == NULL, ofs >= plen */
DieterGraef 0:f9b6112278fe 369 return ERR_ARG;
DieterGraef 0:f9b6112278fe 370 }
DieterGraef 0:f9b6112278fe 371
DieterGraef 0:f9b6112278fe 372 /**
DieterGraef 0:f9b6112278fe 373 * Encodes s32_t integer into a pbuf chained ASN1 msg.
DieterGraef 0:f9b6112278fe 374 *
DieterGraef 0:f9b6112278fe 375 * @param p points to output pbuf to encode value into
DieterGraef 0:f9b6112278fe 376 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:f9b6112278fe 377 * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt())
DieterGraef 0:f9b6112278fe 378 * @param value is the host order s32_t value to be encoded
DieterGraef 0:f9b6112278fe 379 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:f9b6112278fe 380 *
DieterGraef 0:f9b6112278fe 381 * @see snmp_asn1_enc_s32t_cnt()
DieterGraef 0:f9b6112278fe 382 */
DieterGraef 0:f9b6112278fe 383 err_t
DieterGraef 0:f9b6112278fe 384 snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value)
DieterGraef 0:f9b6112278fe 385 {
DieterGraef 0:f9b6112278fe 386 u16_t plen, base;
DieterGraef 0:f9b6112278fe 387 u8_t *msg_ptr;
DieterGraef 0:f9b6112278fe 388
DieterGraef 0:f9b6112278fe 389 plen = 0;
DieterGraef 0:f9b6112278fe 390 while (p != NULL)
DieterGraef 0:f9b6112278fe 391 {
DieterGraef 0:f9b6112278fe 392 base = plen;
DieterGraef 0:f9b6112278fe 393 plen += p->len;
DieterGraef 0:f9b6112278fe 394 if (ofs < plen)
DieterGraef 0:f9b6112278fe 395 {
DieterGraef 0:f9b6112278fe 396 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 397 msg_ptr += ofs - base;
DieterGraef 0:f9b6112278fe 398
DieterGraef 0:f9b6112278fe 399 while (octets_needed > 1)
DieterGraef 0:f9b6112278fe 400 {
DieterGraef 0:f9b6112278fe 401 octets_needed--;
DieterGraef 0:f9b6112278fe 402 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
DieterGraef 0:f9b6112278fe 403 ofs += 1;
DieterGraef 0:f9b6112278fe 404 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 405 {
DieterGraef 0:f9b6112278fe 406 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 407 p = p->next;
DieterGraef 0:f9b6112278fe 408 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 409 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 410 plen += p->len;
DieterGraef 0:f9b6112278fe 411 }
DieterGraef 0:f9b6112278fe 412 else
DieterGraef 0:f9b6112278fe 413 {
DieterGraef 0:f9b6112278fe 414 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 415 msg_ptr++;
DieterGraef 0:f9b6112278fe 416 }
DieterGraef 0:f9b6112278fe 417 }
DieterGraef 0:f9b6112278fe 418 /* (only) one least significant octet */
DieterGraef 0:f9b6112278fe 419 *msg_ptr = (u8_t)value;
DieterGraef 0:f9b6112278fe 420 return ERR_OK;
DieterGraef 0:f9b6112278fe 421 }
DieterGraef 0:f9b6112278fe 422 p = p->next;
DieterGraef 0:f9b6112278fe 423 }
DieterGraef 0:f9b6112278fe 424 /* p == NULL, ofs >= plen */
DieterGraef 0:f9b6112278fe 425 return ERR_ARG;
DieterGraef 0:f9b6112278fe 426 }
DieterGraef 0:f9b6112278fe 427
DieterGraef 0:f9b6112278fe 428 /**
DieterGraef 0:f9b6112278fe 429 * Encodes object identifier into a pbuf chained ASN1 msg.
DieterGraef 0:f9b6112278fe 430 *
DieterGraef 0:f9b6112278fe 431 * @param p points to output pbuf to encode oid into
DieterGraef 0:f9b6112278fe 432 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:f9b6112278fe 433 * @param ident_len object identifier array length
DieterGraef 0:f9b6112278fe 434 * @param ident points to object identifier array
DieterGraef 0:f9b6112278fe 435 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:f9b6112278fe 436 */
DieterGraef 0:f9b6112278fe 437 err_t
DieterGraef 0:f9b6112278fe 438 snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident)
DieterGraef 0:f9b6112278fe 439 {
DieterGraef 0:f9b6112278fe 440 u16_t plen, base;
DieterGraef 0:f9b6112278fe 441 u8_t *msg_ptr;
DieterGraef 0:f9b6112278fe 442
DieterGraef 0:f9b6112278fe 443 plen = 0;
DieterGraef 0:f9b6112278fe 444 while (p != NULL)
DieterGraef 0:f9b6112278fe 445 {
DieterGraef 0:f9b6112278fe 446 base = plen;
DieterGraef 0:f9b6112278fe 447 plen += p->len;
DieterGraef 0:f9b6112278fe 448 if (ofs < plen)
DieterGraef 0:f9b6112278fe 449 {
DieterGraef 0:f9b6112278fe 450 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 451 msg_ptr += ofs - base;
DieterGraef 0:f9b6112278fe 452
DieterGraef 0:f9b6112278fe 453 if (ident_len > 1)
DieterGraef 0:f9b6112278fe 454 {
DieterGraef 0:f9b6112278fe 455 if ((ident[0] == 1) && (ident[1] == 3))
DieterGraef 0:f9b6112278fe 456 {
DieterGraef 0:f9b6112278fe 457 /* compressed (most common) prefix .iso.org */
DieterGraef 0:f9b6112278fe 458 *msg_ptr = 0x2b;
DieterGraef 0:f9b6112278fe 459 }
DieterGraef 0:f9b6112278fe 460 else
DieterGraef 0:f9b6112278fe 461 {
DieterGraef 0:f9b6112278fe 462 /* calculate prefix */
DieterGraef 0:f9b6112278fe 463 *msg_ptr = (u8_t)((ident[0] * 40) + ident[1]);
DieterGraef 0:f9b6112278fe 464 }
DieterGraef 0:f9b6112278fe 465 ofs += 1;
DieterGraef 0:f9b6112278fe 466 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 467 {
DieterGraef 0:f9b6112278fe 468 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 469 p = p->next;
DieterGraef 0:f9b6112278fe 470 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 471 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 472 plen += p->len;
DieterGraef 0:f9b6112278fe 473 }
DieterGraef 0:f9b6112278fe 474 else
DieterGraef 0:f9b6112278fe 475 {
DieterGraef 0:f9b6112278fe 476 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 477 msg_ptr++;
DieterGraef 0:f9b6112278fe 478 }
DieterGraef 0:f9b6112278fe 479 ident_len -= 2;
DieterGraef 0:f9b6112278fe 480 ident += 2;
DieterGraef 0:f9b6112278fe 481 }
DieterGraef 0:f9b6112278fe 482 else
DieterGraef 0:f9b6112278fe 483 {
DieterGraef 0:f9b6112278fe 484 /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */
DieterGraef 0:f9b6112278fe 485 /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */
DieterGraef 0:f9b6112278fe 486 return ERR_ARG;
DieterGraef 0:f9b6112278fe 487 }
DieterGraef 0:f9b6112278fe 488 while (ident_len > 0)
DieterGraef 0:f9b6112278fe 489 {
DieterGraef 0:f9b6112278fe 490 s32_t sub_id;
DieterGraef 0:f9b6112278fe 491 u8_t shift, tail;
DieterGraef 0:f9b6112278fe 492
DieterGraef 0:f9b6112278fe 493 ident_len--;
DieterGraef 0:f9b6112278fe 494 sub_id = *ident;
DieterGraef 0:f9b6112278fe 495 tail = 0;
DieterGraef 0:f9b6112278fe 496 shift = 28;
DieterGraef 0:f9b6112278fe 497 while(shift > 0)
DieterGraef 0:f9b6112278fe 498 {
DieterGraef 0:f9b6112278fe 499 u8_t code;
DieterGraef 0:f9b6112278fe 500
DieterGraef 0:f9b6112278fe 501 code = (u8_t)(sub_id >> shift);
DieterGraef 0:f9b6112278fe 502 if ((code != 0) || (tail != 0))
DieterGraef 0:f9b6112278fe 503 {
DieterGraef 0:f9b6112278fe 504 tail = 1;
DieterGraef 0:f9b6112278fe 505 *msg_ptr = code | 0x80;
DieterGraef 0:f9b6112278fe 506 ofs += 1;
DieterGraef 0:f9b6112278fe 507 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 508 {
DieterGraef 0:f9b6112278fe 509 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 510 p = p->next;
DieterGraef 0:f9b6112278fe 511 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 512 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 513 plen += p->len;
DieterGraef 0:f9b6112278fe 514 }
DieterGraef 0:f9b6112278fe 515 else
DieterGraef 0:f9b6112278fe 516 {
DieterGraef 0:f9b6112278fe 517 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 518 msg_ptr++;
DieterGraef 0:f9b6112278fe 519 }
DieterGraef 0:f9b6112278fe 520 }
DieterGraef 0:f9b6112278fe 521 shift -= 7;
DieterGraef 0:f9b6112278fe 522 }
DieterGraef 0:f9b6112278fe 523 *msg_ptr = (u8_t)sub_id & 0x7F;
DieterGraef 0:f9b6112278fe 524 if (ident_len > 0)
DieterGraef 0:f9b6112278fe 525 {
DieterGraef 0:f9b6112278fe 526 ofs += 1;
DieterGraef 0:f9b6112278fe 527 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 528 {
DieterGraef 0:f9b6112278fe 529 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 530 p = p->next;
DieterGraef 0:f9b6112278fe 531 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 532 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 533 plen += p->len;
DieterGraef 0:f9b6112278fe 534 }
DieterGraef 0:f9b6112278fe 535 else
DieterGraef 0:f9b6112278fe 536 {
DieterGraef 0:f9b6112278fe 537 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 538 msg_ptr++;
DieterGraef 0:f9b6112278fe 539 }
DieterGraef 0:f9b6112278fe 540 }
DieterGraef 0:f9b6112278fe 541 /* proceed to next sub-identifier */
DieterGraef 0:f9b6112278fe 542 ident++;
DieterGraef 0:f9b6112278fe 543 }
DieterGraef 0:f9b6112278fe 544 return ERR_OK;
DieterGraef 0:f9b6112278fe 545 }
DieterGraef 0:f9b6112278fe 546 p = p->next;
DieterGraef 0:f9b6112278fe 547 }
DieterGraef 0:f9b6112278fe 548 /* p == NULL, ofs >= plen */
DieterGraef 0:f9b6112278fe 549 return ERR_ARG;
DieterGraef 0:f9b6112278fe 550 }
DieterGraef 0:f9b6112278fe 551
DieterGraef 0:f9b6112278fe 552 /**
DieterGraef 0:f9b6112278fe 553 * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg.
DieterGraef 0:f9b6112278fe 554 *
DieterGraef 0:f9b6112278fe 555 * @param p points to output pbuf to encode raw data into
DieterGraef 0:f9b6112278fe 556 * @param ofs points to the offset within the pbuf chain
DieterGraef 0:f9b6112278fe 557 * @param raw_len raw data length
DieterGraef 0:f9b6112278fe 558 * @param raw points raw data
DieterGraef 0:f9b6112278fe 559 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
DieterGraef 0:f9b6112278fe 560 */
DieterGraef 0:f9b6112278fe 561 err_t
DieterGraef 0:f9b6112278fe 562 snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw)
DieterGraef 0:f9b6112278fe 563 {
DieterGraef 0:f9b6112278fe 564 u16_t plen, base;
DieterGraef 0:f9b6112278fe 565 u8_t *msg_ptr;
DieterGraef 0:f9b6112278fe 566
DieterGraef 0:f9b6112278fe 567 plen = 0;
DieterGraef 0:f9b6112278fe 568 while (p != NULL)
DieterGraef 0:f9b6112278fe 569 {
DieterGraef 0:f9b6112278fe 570 base = plen;
DieterGraef 0:f9b6112278fe 571 plen += p->len;
DieterGraef 0:f9b6112278fe 572 if (ofs < plen)
DieterGraef 0:f9b6112278fe 573 {
DieterGraef 0:f9b6112278fe 574 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 575 msg_ptr += ofs - base;
DieterGraef 0:f9b6112278fe 576
DieterGraef 0:f9b6112278fe 577 while (raw_len > 1)
DieterGraef 0:f9b6112278fe 578 {
DieterGraef 0:f9b6112278fe 579 /* copy raw_len - 1 octets */
DieterGraef 0:f9b6112278fe 580 raw_len--;
DieterGraef 0:f9b6112278fe 581 *msg_ptr = *raw;
DieterGraef 0:f9b6112278fe 582 raw++;
DieterGraef 0:f9b6112278fe 583 ofs += 1;
DieterGraef 0:f9b6112278fe 584 if (ofs >= plen)
DieterGraef 0:f9b6112278fe 585 {
DieterGraef 0:f9b6112278fe 586 /* next octet in next pbuf */
DieterGraef 0:f9b6112278fe 587 p = p->next;
DieterGraef 0:f9b6112278fe 588 if (p == NULL) { return ERR_ARG; }
DieterGraef 0:f9b6112278fe 589 msg_ptr = (u8_t*)p->payload;
DieterGraef 0:f9b6112278fe 590 plen += p->len;
DieterGraef 0:f9b6112278fe 591 }
DieterGraef 0:f9b6112278fe 592 else
DieterGraef 0:f9b6112278fe 593 {
DieterGraef 0:f9b6112278fe 594 /* next octet in same pbuf */
DieterGraef 0:f9b6112278fe 595 msg_ptr++;
DieterGraef 0:f9b6112278fe 596 }
DieterGraef 0:f9b6112278fe 597 }
DieterGraef 0:f9b6112278fe 598 if (raw_len > 0)
DieterGraef 0:f9b6112278fe 599 {
DieterGraef 0:f9b6112278fe 600 /* copy last or single octet */
DieterGraef 0:f9b6112278fe 601 *msg_ptr = *raw;
DieterGraef 0:f9b6112278fe 602 }
DieterGraef 0:f9b6112278fe 603 return ERR_OK;
DieterGraef 0:f9b6112278fe 604 }
DieterGraef 0:f9b6112278fe 605 p = p->next;
DieterGraef 0:f9b6112278fe 606 }
DieterGraef 0:f9b6112278fe 607 /* p == NULL, ofs >= plen */
DieterGraef 0:f9b6112278fe 608 return ERR_ARG;
DieterGraef 0:f9b6112278fe 609 }
DieterGraef 0:f9b6112278fe 610
DieterGraef 0:f9b6112278fe 611 #endif /* LWIP_SNMP */