mbed unsupported / lwip

A version of LWIP, provided for backwards compatibility.

Dependents:   AA_DemoBoard DemoBoard HelloServerDemo DemoBoard_RangeIndicator ... more

trunk/Core/lwIP/core/snmp/asn1_enc.c@0:5e1631496985, 2012-05-08 (annotated)

Committer:
root@mbed.org
Date:
Tue May 08 15:32:10 2012 +0100
Revision:
0:5e1631496985
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
root@mbed.org 0:5e1631496985 1 /**
root@mbed.org 0:5e1631496985 2 * @file
root@mbed.org 0:5e1631496985 3 * Abstract Syntax Notation One (ISO 8824, 8825) encoding
root@mbed.org 0:5e1631496985 4 *
root@mbed.org 0:5e1631496985 5 * @todo not optimised (yet), favor correctness over speed, favor speed over size
root@mbed.org 0:5e1631496985 6 */
root@mbed.org 0:5e1631496985 7
root@mbed.org 0:5e1631496985 8 /*
root@mbed.org 0:5e1631496985 9 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
root@mbed.org 0:5e1631496985 10 * All rights reserved.
root@mbed.org 0:5e1631496985 11 *
root@mbed.org 0:5e1631496985 12 * Redistribution and use in source and binary forms, with or without modification,
root@mbed.org 0:5e1631496985 13 * are permitted provided that the following conditions are met:
root@mbed.org 0:5e1631496985 14 *
root@mbed.org 0:5e1631496985 15 * 1. Redistributions of source code must retain the above copyright notice,
root@mbed.org 0:5e1631496985 16 * this list of conditions and the following disclaimer.
root@mbed.org 0:5e1631496985 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
root@mbed.org 0:5e1631496985 18 * this list of conditions and the following disclaimer in the documentation
root@mbed.org 0:5e1631496985 19 * and/or other materials provided with the distribution.
root@mbed.org 0:5e1631496985 20 * 3. The name of the author may not be used to endorse or promote products
root@mbed.org 0:5e1631496985 21 * derived from this software without specific prior written permission.
root@mbed.org 0:5e1631496985 22 *
root@mbed.org 0:5e1631496985 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
root@mbed.org 0:5e1631496985 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
root@mbed.org 0:5e1631496985 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
root@mbed.org 0:5e1631496985 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
root@mbed.org 0:5e1631496985 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
root@mbed.org 0:5e1631496985 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
root@mbed.org 0:5e1631496985 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
root@mbed.org 0:5e1631496985 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
root@mbed.org 0:5e1631496985 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
root@mbed.org 0:5e1631496985 32 * OF SUCH DAMAGE.
root@mbed.org 0:5e1631496985 33 *
root@mbed.org 0:5e1631496985 34 * Author: Christiaan Simons <christiaan.simons@axon.tv>
root@mbed.org 0:5e1631496985 35 */
root@mbed.org 0:5e1631496985 36
root@mbed.org 0:5e1631496985 37 #include "lwip/opt.h"
root@mbed.org 0:5e1631496985 38
root@mbed.org 0:5e1631496985 39 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
root@mbed.org 0:5e1631496985 40
root@mbed.org 0:5e1631496985 41 #include "lwip/snmp_asn1.h"
root@mbed.org 0:5e1631496985 42
root@mbed.org 0:5e1631496985 43 /**
root@mbed.org 0:5e1631496985 44 * Returns octet count for length.
root@mbed.org 0:5e1631496985 45 *
root@mbed.org 0:5e1631496985 46 * @param length
root@mbed.org 0:5e1631496985 47 * @param octets_needed points to the return value
root@mbed.org 0:5e1631496985 48 */
root@mbed.org 0:5e1631496985 49 void
root@mbed.org 0:5e1631496985 50 snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed)
root@mbed.org 0:5e1631496985 51 {
root@mbed.org 0:5e1631496985 52 if (length < 0x80U)
root@mbed.org 0:5e1631496985 53 {
root@mbed.org 0:5e1631496985 54 *octets_needed = 1;
root@mbed.org 0:5e1631496985 55 }
root@mbed.org 0:5e1631496985 56 else if (length < 0x100U)
root@mbed.org 0:5e1631496985 57 {
root@mbed.org 0:5e1631496985 58 *octets_needed = 2;
root@mbed.org 0:5e1631496985 59 }
root@mbed.org 0:5e1631496985 60 else
root@mbed.org 0:5e1631496985 61 {
root@mbed.org 0:5e1631496985 62 *octets_needed = 3;
root@mbed.org 0:5e1631496985 63 }
root@mbed.org 0:5e1631496985 64 }
root@mbed.org 0:5e1631496985 65
root@mbed.org 0:5e1631496985 66 /**
root@mbed.org 0:5e1631496985 67 * Returns octet count for an u32_t.
root@mbed.org 0:5e1631496985 68 *
root@mbed.org 0:5e1631496985 69 * @param value
root@mbed.org 0:5e1631496985 70 * @param octets_needed points to the return value
root@mbed.org 0:5e1631496985 71 *
root@mbed.org 0:5e1631496985 72 * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded
root@mbed.org 0:5e1631496985 73 * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value
root@mbed.org 0:5e1631496985 74 * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!!
root@mbed.org 0:5e1631496985 75 */
root@mbed.org 0:5e1631496985 76 void
root@mbed.org 0:5e1631496985 77 snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed)
root@mbed.org 0:5e1631496985 78 {
root@mbed.org 0:5e1631496985 79 if (value < 0x80UL)
root@mbed.org 0:5e1631496985 80 {
root@mbed.org 0:5e1631496985 81 *octets_needed = 1;
root@mbed.org 0:5e1631496985 82 }
root@mbed.org 0:5e1631496985 83 else if (value < 0x8000UL)
root@mbed.org 0:5e1631496985 84 {
root@mbed.org 0:5e1631496985 85 *octets_needed = 2;
root@mbed.org 0:5e1631496985 86 }
root@mbed.org 0:5e1631496985 87 else if (value < 0x800000UL)
root@mbed.org 0:5e1631496985 88 {
root@mbed.org 0:5e1631496985 89 *octets_needed = 3;
root@mbed.org 0:5e1631496985 90 }
root@mbed.org 0:5e1631496985 91 else if (value < 0x80000000UL)
root@mbed.org 0:5e1631496985 92 {
root@mbed.org 0:5e1631496985 93 *octets_needed = 4;
root@mbed.org 0:5e1631496985 94 }
root@mbed.org 0:5e1631496985 95 else
root@mbed.org 0:5e1631496985 96 {
root@mbed.org 0:5e1631496985 97 *octets_needed = 5;
root@mbed.org 0:5e1631496985 98 }
root@mbed.org 0:5e1631496985 99 }
root@mbed.org 0:5e1631496985 100
root@mbed.org 0:5e1631496985 101 /**
root@mbed.org 0:5e1631496985 102 * Returns octet count for an s32_t.
root@mbed.org 0:5e1631496985 103 *
root@mbed.org 0:5e1631496985 104 * @param value
root@mbed.org 0:5e1631496985 105 * @param octets_needed points to the return value
root@mbed.org 0:5e1631496985 106 *
root@mbed.org 0:5e1631496985 107 * @note ASN coded integers are _always_ signed.
root@mbed.org 0:5e1631496985 108 */
root@mbed.org 0:5e1631496985 109 void
root@mbed.org 0:5e1631496985 110 snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed)
root@mbed.org 0:5e1631496985 111 {
root@mbed.org 0:5e1631496985 112 if (value < 0)
root@mbed.org 0:5e1631496985 113 {
root@mbed.org 0:5e1631496985 114 value = ~value;
root@mbed.org 0:5e1631496985 115 }
root@mbed.org 0:5e1631496985 116 if (value < 0x80L)
root@mbed.org 0:5e1631496985 117 {
root@mbed.org 0:5e1631496985 118 *octets_needed = 1;
root@mbed.org 0:5e1631496985 119 }
root@mbed.org 0:5e1631496985 120 else if (value < 0x8000L)
root@mbed.org 0:5e1631496985 121 {
root@mbed.org 0:5e1631496985 122 *octets_needed = 2;
root@mbed.org 0:5e1631496985 123 }
root@mbed.org 0:5e1631496985 124 else if (value < 0x800000L)
root@mbed.org 0:5e1631496985 125 {
root@mbed.org 0:5e1631496985 126 *octets_needed = 3;
root@mbed.org 0:5e1631496985 127 }
root@mbed.org 0:5e1631496985 128 else
root@mbed.org 0:5e1631496985 129 {
root@mbed.org 0:5e1631496985 130 *octets_needed = 4;
root@mbed.org 0:5e1631496985 131 }
root@mbed.org 0:5e1631496985 132 }
root@mbed.org 0:5e1631496985 133
root@mbed.org 0:5e1631496985 134 /**
root@mbed.org 0:5e1631496985 135 * Returns octet count for an object identifier.
root@mbed.org 0:5e1631496985 136 *
root@mbed.org 0:5e1631496985 137 * @param ident_len object identifier array length
root@mbed.org 0:5e1631496985 138 * @param ident points to object identifier array
root@mbed.org 0:5e1631496985 139 * @param octets_needed points to the return value
root@mbed.org 0:5e1631496985 140 */
root@mbed.org 0:5e1631496985 141 void
root@mbed.org 0:5e1631496985 142 snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed)
root@mbed.org 0:5e1631496985 143 {
root@mbed.org 0:5e1631496985 144 s32_t sub_id;
root@mbed.org 0:5e1631496985 145 u8_t cnt;
root@mbed.org 0:5e1631496985 146
root@mbed.org 0:5e1631496985 147 cnt = 0;
root@mbed.org 0:5e1631496985 148 if (ident_len > 1)
root@mbed.org 0:5e1631496985 149 {
root@mbed.org 0:5e1631496985 150 /* compressed prefix in one octet */
root@mbed.org 0:5e1631496985 151 cnt++;
root@mbed.org 0:5e1631496985 152 ident_len -= 2;
root@mbed.org 0:5e1631496985 153 ident += 2;
root@mbed.org 0:5e1631496985 154 }
root@mbed.org 0:5e1631496985 155 while(ident_len > 0)
root@mbed.org 0:5e1631496985 156 {
root@mbed.org 0:5e1631496985 157 ident_len--;
root@mbed.org 0:5e1631496985 158 sub_id = *ident;
root@mbed.org 0:5e1631496985 159
root@mbed.org 0:5e1631496985 160 sub_id >>= 7;
root@mbed.org 0:5e1631496985 161 cnt++;
root@mbed.org 0:5e1631496985 162 while(sub_id > 0)
root@mbed.org 0:5e1631496985 163 {
root@mbed.org 0:5e1631496985 164 sub_id >>= 7;
root@mbed.org 0:5e1631496985 165 cnt++;
root@mbed.org 0:5e1631496985 166 }
root@mbed.org 0:5e1631496985 167 ident++;
root@mbed.org 0:5e1631496985 168 }
root@mbed.org 0:5e1631496985 169 *octets_needed = cnt;
root@mbed.org 0:5e1631496985 170 }
root@mbed.org 0:5e1631496985 171
root@mbed.org 0:5e1631496985 172 /**
root@mbed.org 0:5e1631496985 173 * Encodes ASN type field into a pbuf chained ASN1 msg.
root@mbed.org 0:5e1631496985 174 *
root@mbed.org 0:5e1631496985 175 * @param p points to output pbuf to encode value into
root@mbed.org 0:5e1631496985 176 * @param ofs points to the offset within the pbuf chain
root@mbed.org 0:5e1631496985 177 * @param type input ASN1 type
root@mbed.org 0:5e1631496985 178 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
root@mbed.org 0:5e1631496985 179 */
root@mbed.org 0:5e1631496985 180 err_t
root@mbed.org 0:5e1631496985 181 snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type)
root@mbed.org 0:5e1631496985 182 {
root@mbed.org 0:5e1631496985 183 u16_t plen, base;
root@mbed.org 0:5e1631496985 184 u8_t *msg_ptr;
root@mbed.org 0:5e1631496985 185
root@mbed.org 0:5e1631496985 186 plen = 0;
root@mbed.org 0:5e1631496985 187 while (p != NULL)
root@mbed.org 0:5e1631496985 188 {
root@mbed.org 0:5e1631496985 189 base = plen;
root@mbed.org 0:5e1631496985 190 plen += p->len;
root@mbed.org 0:5e1631496985 191 if (ofs < plen)
root@mbed.org 0:5e1631496985 192 {
root@mbed.org 0:5e1631496985 193 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 194 msg_ptr += ofs - base;
root@mbed.org 0:5e1631496985 195 *msg_ptr = type;
root@mbed.org 0:5e1631496985 196 return ERR_OK;
root@mbed.org 0:5e1631496985 197 }
root@mbed.org 0:5e1631496985 198 p = p->next;
root@mbed.org 0:5e1631496985 199 }
root@mbed.org 0:5e1631496985 200 /* p == NULL, ofs >= plen */
root@mbed.org 0:5e1631496985 201 return ERR_ARG;
root@mbed.org 0:5e1631496985 202 }
root@mbed.org 0:5e1631496985 203
root@mbed.org 0:5e1631496985 204 /**
root@mbed.org 0:5e1631496985 205 * Encodes host order length field into a pbuf chained ASN1 msg.
root@mbed.org 0:5e1631496985 206 *
root@mbed.org 0:5e1631496985 207 * @param p points to output pbuf to encode length into
root@mbed.org 0:5e1631496985 208 * @param ofs points to the offset within the pbuf chain
root@mbed.org 0:5e1631496985 209 * @param length is the host order length to be encoded
root@mbed.org 0:5e1631496985 210 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
root@mbed.org 0:5e1631496985 211 */
root@mbed.org 0:5e1631496985 212 err_t
root@mbed.org 0:5e1631496985 213 snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length)
root@mbed.org 0:5e1631496985 214 {
root@mbed.org 0:5e1631496985 215 u16_t plen, base;
root@mbed.org 0:5e1631496985 216 u8_t *msg_ptr;
root@mbed.org 0:5e1631496985 217
root@mbed.org 0:5e1631496985 218 plen = 0;
root@mbed.org 0:5e1631496985 219 while (p != NULL)
root@mbed.org 0:5e1631496985 220 {
root@mbed.org 0:5e1631496985 221 base = plen;
root@mbed.org 0:5e1631496985 222 plen += p->len;
root@mbed.org 0:5e1631496985 223 if (ofs < plen)
root@mbed.org 0:5e1631496985 224 {
root@mbed.org 0:5e1631496985 225 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 226 msg_ptr += ofs - base;
root@mbed.org 0:5e1631496985 227
root@mbed.org 0:5e1631496985 228 if (length < 0x80)
root@mbed.org 0:5e1631496985 229 {
root@mbed.org 0:5e1631496985 230 *msg_ptr = length;
root@mbed.org 0:5e1631496985 231 return ERR_OK;
root@mbed.org 0:5e1631496985 232 }
root@mbed.org 0:5e1631496985 233 else if (length < 0x100)
root@mbed.org 0:5e1631496985 234 {
root@mbed.org 0:5e1631496985 235 *msg_ptr = 0x81;
root@mbed.org 0:5e1631496985 236 ofs += 1;
root@mbed.org 0:5e1631496985 237 if (ofs >= plen)
root@mbed.org 0:5e1631496985 238 {
root@mbed.org 0:5e1631496985 239 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 240 p = p->next;
root@mbed.org 0:5e1631496985 241 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 242 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 243 }
root@mbed.org 0:5e1631496985 244 else
root@mbed.org 0:5e1631496985 245 {
root@mbed.org 0:5e1631496985 246 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 247 msg_ptr++;
root@mbed.org 0:5e1631496985 248 }
root@mbed.org 0:5e1631496985 249 *msg_ptr = length;
root@mbed.org 0:5e1631496985 250 return ERR_OK;
root@mbed.org 0:5e1631496985 251 }
root@mbed.org 0:5e1631496985 252 else
root@mbed.org 0:5e1631496985 253 {
root@mbed.org 0:5e1631496985 254 u8_t i;
root@mbed.org 0:5e1631496985 255
root@mbed.org 0:5e1631496985 256 /* length >= 0x100 && length <= 0xFFFF */
root@mbed.org 0:5e1631496985 257 *msg_ptr = 0x82;
root@mbed.org 0:5e1631496985 258 i = 2;
root@mbed.org 0:5e1631496985 259 while (i > 0)
root@mbed.org 0:5e1631496985 260 {
root@mbed.org 0:5e1631496985 261 i--;
root@mbed.org 0:5e1631496985 262 ofs += 1;
root@mbed.org 0:5e1631496985 263 if (ofs >= plen)
root@mbed.org 0:5e1631496985 264 {
root@mbed.org 0:5e1631496985 265 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 266 p = p->next;
root@mbed.org 0:5e1631496985 267 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 268 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 269 plen += p->len;
root@mbed.org 0:5e1631496985 270 }
root@mbed.org 0:5e1631496985 271 else
root@mbed.org 0:5e1631496985 272 {
root@mbed.org 0:5e1631496985 273 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 274 msg_ptr++;
root@mbed.org 0:5e1631496985 275 }
root@mbed.org 0:5e1631496985 276 if (i == 0)
root@mbed.org 0:5e1631496985 277 {
root@mbed.org 0:5e1631496985 278 /* least significant length octet */
root@mbed.org 0:5e1631496985 279 *msg_ptr = length;
root@mbed.org 0:5e1631496985 280 }
root@mbed.org 0:5e1631496985 281 else
root@mbed.org 0:5e1631496985 282 {
root@mbed.org 0:5e1631496985 283 /* most significant length octet */
root@mbed.org 0:5e1631496985 284 *msg_ptr = length >> 8;
root@mbed.org 0:5e1631496985 285 }
root@mbed.org 0:5e1631496985 286 }
root@mbed.org 0:5e1631496985 287 return ERR_OK;
root@mbed.org 0:5e1631496985 288 }
root@mbed.org 0:5e1631496985 289 }
root@mbed.org 0:5e1631496985 290 p = p->next;
root@mbed.org 0:5e1631496985 291 }
root@mbed.org 0:5e1631496985 292 /* p == NULL, ofs >= plen */
root@mbed.org 0:5e1631496985 293 return ERR_ARG;
root@mbed.org 0:5e1631496985 294 }
root@mbed.org 0:5e1631496985 295
root@mbed.org 0:5e1631496985 296 /**
root@mbed.org 0:5e1631496985 297 * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg.
root@mbed.org 0:5e1631496985 298 *
root@mbed.org 0:5e1631496985 299 * @param p points to output pbuf to encode value into
root@mbed.org 0:5e1631496985 300 * @param ofs points to the offset within the pbuf chain
root@mbed.org 0:5e1631496985 301 * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt())
root@mbed.org 0:5e1631496985 302 * @param value is the host order u32_t value to be encoded
root@mbed.org 0:5e1631496985 303 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
root@mbed.org 0:5e1631496985 304 *
root@mbed.org 0:5e1631496985 305 * @see snmp_asn1_enc_u32t_cnt()
root@mbed.org 0:5e1631496985 306 */
root@mbed.org 0:5e1631496985 307 err_t
root@mbed.org 0:5e1631496985 308 snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, u32_t value)
root@mbed.org 0:5e1631496985 309 {
root@mbed.org 0:5e1631496985 310 u16_t plen, base;
root@mbed.org 0:5e1631496985 311 u8_t *msg_ptr;
root@mbed.org 0:5e1631496985 312
root@mbed.org 0:5e1631496985 313 plen = 0;
root@mbed.org 0:5e1631496985 314 while (p != NULL)
root@mbed.org 0:5e1631496985 315 {
root@mbed.org 0:5e1631496985 316 base = plen;
root@mbed.org 0:5e1631496985 317 plen += p->len;
root@mbed.org 0:5e1631496985 318 if (ofs < plen)
root@mbed.org 0:5e1631496985 319 {
root@mbed.org 0:5e1631496985 320 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 321 msg_ptr += ofs - base;
root@mbed.org 0:5e1631496985 322
root@mbed.org 0:5e1631496985 323 if (octets_needed == 5)
root@mbed.org 0:5e1631496985 324 {
root@mbed.org 0:5e1631496985 325 /* not enough bits in 'value' add leading 0x00 */
root@mbed.org 0:5e1631496985 326 octets_needed--;
root@mbed.org 0:5e1631496985 327 *msg_ptr = 0x00;
root@mbed.org 0:5e1631496985 328 ofs += 1;
root@mbed.org 0:5e1631496985 329 if (ofs >= plen)
root@mbed.org 0:5e1631496985 330 {
root@mbed.org 0:5e1631496985 331 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 332 p = p->next;
root@mbed.org 0:5e1631496985 333 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 334 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 335 plen += p->len;
root@mbed.org 0:5e1631496985 336 }
root@mbed.org 0:5e1631496985 337 else
root@mbed.org 0:5e1631496985 338 {
root@mbed.org 0:5e1631496985 339 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 340 msg_ptr++;
root@mbed.org 0:5e1631496985 341 }
root@mbed.org 0:5e1631496985 342 }
root@mbed.org 0:5e1631496985 343 while (octets_needed > 1)
root@mbed.org 0:5e1631496985 344 {
root@mbed.org 0:5e1631496985 345 octets_needed--;
root@mbed.org 0:5e1631496985 346 *msg_ptr = value >> (octets_needed << 3);
root@mbed.org 0:5e1631496985 347 ofs += 1;
root@mbed.org 0:5e1631496985 348 if (ofs >= plen)
root@mbed.org 0:5e1631496985 349 {
root@mbed.org 0:5e1631496985 350 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 351 p = p->next;
root@mbed.org 0:5e1631496985 352 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 353 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 354 plen += p->len;
root@mbed.org 0:5e1631496985 355 }
root@mbed.org 0:5e1631496985 356 else
root@mbed.org 0:5e1631496985 357 {
root@mbed.org 0:5e1631496985 358 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 359 msg_ptr++;
root@mbed.org 0:5e1631496985 360 }
root@mbed.org 0:5e1631496985 361 }
root@mbed.org 0:5e1631496985 362 /* (only) one least significant octet */
root@mbed.org 0:5e1631496985 363 *msg_ptr = value;
root@mbed.org 0:5e1631496985 364 return ERR_OK;
root@mbed.org 0:5e1631496985 365 }
root@mbed.org 0:5e1631496985 366 p = p->next;
root@mbed.org 0:5e1631496985 367 }
root@mbed.org 0:5e1631496985 368 /* p == NULL, ofs >= plen */
root@mbed.org 0:5e1631496985 369 return ERR_ARG;
root@mbed.org 0:5e1631496985 370 }
root@mbed.org 0:5e1631496985 371
root@mbed.org 0:5e1631496985 372 /**
root@mbed.org 0:5e1631496985 373 * Encodes s32_t integer into a pbuf chained ASN1 msg.
root@mbed.org 0:5e1631496985 374 *
root@mbed.org 0:5e1631496985 375 * @param p points to output pbuf to encode value into
root@mbed.org 0:5e1631496985 376 * @param ofs points to the offset within the pbuf chain
root@mbed.org 0:5e1631496985 377 * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt())
root@mbed.org 0:5e1631496985 378 * @param value is the host order s32_t value to be encoded
root@mbed.org 0:5e1631496985 379 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
root@mbed.org 0:5e1631496985 380 *
root@mbed.org 0:5e1631496985 381 * @see snmp_asn1_enc_s32t_cnt()
root@mbed.org 0:5e1631496985 382 */
root@mbed.org 0:5e1631496985 383 err_t
root@mbed.org 0:5e1631496985 384 snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, s32_t value)
root@mbed.org 0:5e1631496985 385 {
root@mbed.org 0:5e1631496985 386 u16_t plen, base;
root@mbed.org 0:5e1631496985 387 u8_t *msg_ptr;
root@mbed.org 0:5e1631496985 388
root@mbed.org 0:5e1631496985 389 plen = 0;
root@mbed.org 0:5e1631496985 390 while (p != NULL)
root@mbed.org 0:5e1631496985 391 {
root@mbed.org 0:5e1631496985 392 base = plen;
root@mbed.org 0:5e1631496985 393 plen += p->len;
root@mbed.org 0:5e1631496985 394 if (ofs < plen)
root@mbed.org 0:5e1631496985 395 {
root@mbed.org 0:5e1631496985 396 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 397 msg_ptr += ofs - base;
root@mbed.org 0:5e1631496985 398
root@mbed.org 0:5e1631496985 399 while (octets_needed > 1)
root@mbed.org 0:5e1631496985 400 {
root@mbed.org 0:5e1631496985 401 octets_needed--;
root@mbed.org 0:5e1631496985 402 *msg_ptr = value >> (octets_needed << 3);
root@mbed.org 0:5e1631496985 403 ofs += 1;
root@mbed.org 0:5e1631496985 404 if (ofs >= plen)
root@mbed.org 0:5e1631496985 405 {
root@mbed.org 0:5e1631496985 406 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 407 p = p->next;
root@mbed.org 0:5e1631496985 408 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 409 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 410 plen += p->len;
root@mbed.org 0:5e1631496985 411 }
root@mbed.org 0:5e1631496985 412 else
root@mbed.org 0:5e1631496985 413 {
root@mbed.org 0:5e1631496985 414 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 415 msg_ptr++;
root@mbed.org 0:5e1631496985 416 }
root@mbed.org 0:5e1631496985 417 }
root@mbed.org 0:5e1631496985 418 /* (only) one least significant octet */
root@mbed.org 0:5e1631496985 419 *msg_ptr = value;
root@mbed.org 0:5e1631496985 420 return ERR_OK;
root@mbed.org 0:5e1631496985 421 }
root@mbed.org 0:5e1631496985 422 p = p->next;
root@mbed.org 0:5e1631496985 423 }
root@mbed.org 0:5e1631496985 424 /* p == NULL, ofs >= plen */
root@mbed.org 0:5e1631496985 425 return ERR_ARG;
root@mbed.org 0:5e1631496985 426 }
root@mbed.org 0:5e1631496985 427
root@mbed.org 0:5e1631496985 428 /**
root@mbed.org 0:5e1631496985 429 * Encodes object identifier into a pbuf chained ASN1 msg.
root@mbed.org 0:5e1631496985 430 *
root@mbed.org 0:5e1631496985 431 * @param p points to output pbuf to encode oid into
root@mbed.org 0:5e1631496985 432 * @param ofs points to the offset within the pbuf chain
root@mbed.org 0:5e1631496985 433 * @param ident_len object identifier array length
root@mbed.org 0:5e1631496985 434 * @param ident points to object identifier array
root@mbed.org 0:5e1631496985 435 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
root@mbed.org 0:5e1631496985 436 */
root@mbed.org 0:5e1631496985 437 err_t
root@mbed.org 0:5e1631496985 438 snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident)
root@mbed.org 0:5e1631496985 439 {
root@mbed.org 0:5e1631496985 440 u16_t plen, base;
root@mbed.org 0:5e1631496985 441 u8_t *msg_ptr;
root@mbed.org 0:5e1631496985 442
root@mbed.org 0:5e1631496985 443 plen = 0;
root@mbed.org 0:5e1631496985 444 while (p != NULL)
root@mbed.org 0:5e1631496985 445 {
root@mbed.org 0:5e1631496985 446 base = plen;
root@mbed.org 0:5e1631496985 447 plen += p->len;
root@mbed.org 0:5e1631496985 448 if (ofs < plen)
root@mbed.org 0:5e1631496985 449 {
root@mbed.org 0:5e1631496985 450 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 451 msg_ptr += ofs - base;
root@mbed.org 0:5e1631496985 452
root@mbed.org 0:5e1631496985 453 if (ident_len > 1)
root@mbed.org 0:5e1631496985 454 {
root@mbed.org 0:5e1631496985 455 if ((ident[0] == 1) && (ident[1] == 3))
root@mbed.org 0:5e1631496985 456 {
root@mbed.org 0:5e1631496985 457 /* compressed (most common) prefix .iso.org */
root@mbed.org 0:5e1631496985 458 *msg_ptr = 0x2b;
root@mbed.org 0:5e1631496985 459 }
root@mbed.org 0:5e1631496985 460 else
root@mbed.org 0:5e1631496985 461 {
root@mbed.org 0:5e1631496985 462 /* calculate prefix */
root@mbed.org 0:5e1631496985 463 *msg_ptr = (ident[0] * 40) + ident[1];
root@mbed.org 0:5e1631496985 464 }
root@mbed.org 0:5e1631496985 465 ofs += 1;
root@mbed.org 0:5e1631496985 466 if (ofs >= plen)
root@mbed.org 0:5e1631496985 467 {
root@mbed.org 0:5e1631496985 468 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 469 p = p->next;
root@mbed.org 0:5e1631496985 470 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 471 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 472 plen += p->len;
root@mbed.org 0:5e1631496985 473 }
root@mbed.org 0:5e1631496985 474 else
root@mbed.org 0:5e1631496985 475 {
root@mbed.org 0:5e1631496985 476 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 477 msg_ptr++;
root@mbed.org 0:5e1631496985 478 }
root@mbed.org 0:5e1631496985 479 ident_len -= 2;
root@mbed.org 0:5e1631496985 480 ident += 2;
root@mbed.org 0:5e1631496985 481 }
root@mbed.org 0:5e1631496985 482 else
root@mbed.org 0:5e1631496985 483 {
root@mbed.org 0:5e1631496985 484 /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */
root@mbed.org 0:5e1631496985 485 /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */
root@mbed.org 0:5e1631496985 486 return ERR_ARG;
root@mbed.org 0:5e1631496985 487 }
root@mbed.org 0:5e1631496985 488 while (ident_len > 0)
root@mbed.org 0:5e1631496985 489 {
root@mbed.org 0:5e1631496985 490 s32_t sub_id;
root@mbed.org 0:5e1631496985 491 u8_t shift, tail;
root@mbed.org 0:5e1631496985 492
root@mbed.org 0:5e1631496985 493 ident_len--;
root@mbed.org 0:5e1631496985 494 sub_id = *ident;
root@mbed.org 0:5e1631496985 495 tail = 0;
root@mbed.org 0:5e1631496985 496 shift = 28;
root@mbed.org 0:5e1631496985 497 while(shift > 0)
root@mbed.org 0:5e1631496985 498 {
root@mbed.org 0:5e1631496985 499 u8_t code;
root@mbed.org 0:5e1631496985 500
root@mbed.org 0:5e1631496985 501 code = sub_id >> shift;
root@mbed.org 0:5e1631496985 502 if ((code != 0) || (tail != 0))
root@mbed.org 0:5e1631496985 503 {
root@mbed.org 0:5e1631496985 504 tail = 1;
root@mbed.org 0:5e1631496985 505 *msg_ptr = code | 0x80;
root@mbed.org 0:5e1631496985 506 ofs += 1;
root@mbed.org 0:5e1631496985 507 if (ofs >= plen)
root@mbed.org 0:5e1631496985 508 {
root@mbed.org 0:5e1631496985 509 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 510 p = p->next;
root@mbed.org 0:5e1631496985 511 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 512 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 513 plen += p->len;
root@mbed.org 0:5e1631496985 514 }
root@mbed.org 0:5e1631496985 515 else
root@mbed.org 0:5e1631496985 516 {
root@mbed.org 0:5e1631496985 517 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 518 msg_ptr++;
root@mbed.org 0:5e1631496985 519 }
root@mbed.org 0:5e1631496985 520 }
root@mbed.org 0:5e1631496985 521 shift -= 7;
root@mbed.org 0:5e1631496985 522 }
root@mbed.org 0:5e1631496985 523 *msg_ptr = (u8_t)sub_id & 0x7F;
root@mbed.org 0:5e1631496985 524 if (ident_len > 0)
root@mbed.org 0:5e1631496985 525 {
root@mbed.org 0:5e1631496985 526 ofs += 1;
root@mbed.org 0:5e1631496985 527 if (ofs >= plen)
root@mbed.org 0:5e1631496985 528 {
root@mbed.org 0:5e1631496985 529 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 530 p = p->next;
root@mbed.org 0:5e1631496985 531 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 532 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 533 plen += p->len;
root@mbed.org 0:5e1631496985 534 }
root@mbed.org 0:5e1631496985 535 else
root@mbed.org 0:5e1631496985 536 {
root@mbed.org 0:5e1631496985 537 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 538 msg_ptr++;
root@mbed.org 0:5e1631496985 539 }
root@mbed.org 0:5e1631496985 540 }
root@mbed.org 0:5e1631496985 541 /* proceed to next sub-identifier */
root@mbed.org 0:5e1631496985 542 ident++;
root@mbed.org 0:5e1631496985 543 }
root@mbed.org 0:5e1631496985 544 return ERR_OK;
root@mbed.org 0:5e1631496985 545 }
root@mbed.org 0:5e1631496985 546 p = p->next;
root@mbed.org 0:5e1631496985 547 }
root@mbed.org 0:5e1631496985 548 /* p == NULL, ofs >= plen */
root@mbed.org 0:5e1631496985 549 return ERR_ARG;
root@mbed.org 0:5e1631496985 550 }
root@mbed.org 0:5e1631496985 551
root@mbed.org 0:5e1631496985 552 /**
root@mbed.org 0:5e1631496985 553 * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg.
root@mbed.org 0:5e1631496985 554 *
root@mbed.org 0:5e1631496985 555 * @param p points to output pbuf to encode raw data into
root@mbed.org 0:5e1631496985 556 * @param ofs points to the offset within the pbuf chain
root@mbed.org 0:5e1631496985 557 * @param raw_len raw data length
root@mbed.org 0:5e1631496985 558 * @param raw points raw data
root@mbed.org 0:5e1631496985 559 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
root@mbed.org 0:5e1631496985 560 */
root@mbed.org 0:5e1631496985 561 err_t
root@mbed.org 0:5e1631496985 562 snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u8_t raw_len, u8_t *raw)
root@mbed.org 0:5e1631496985 563 {
root@mbed.org 0:5e1631496985 564 u16_t plen, base;
root@mbed.org 0:5e1631496985 565 u8_t *msg_ptr;
root@mbed.org 0:5e1631496985 566
root@mbed.org 0:5e1631496985 567 plen = 0;
root@mbed.org 0:5e1631496985 568 while (p != NULL)
root@mbed.org 0:5e1631496985 569 {
root@mbed.org 0:5e1631496985 570 base = plen;
root@mbed.org 0:5e1631496985 571 plen += p->len;
root@mbed.org 0:5e1631496985 572 if (ofs < plen)
root@mbed.org 0:5e1631496985 573 {
root@mbed.org 0:5e1631496985 574 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 575 msg_ptr += ofs - base;
root@mbed.org 0:5e1631496985 576
root@mbed.org 0:5e1631496985 577 while (raw_len > 1)
root@mbed.org 0:5e1631496985 578 {
root@mbed.org 0:5e1631496985 579 /* copy raw_len - 1 octets */
root@mbed.org 0:5e1631496985 580 raw_len--;
root@mbed.org 0:5e1631496985 581 *msg_ptr = *raw;
root@mbed.org 0:5e1631496985 582 raw++;
root@mbed.org 0:5e1631496985 583 ofs += 1;
root@mbed.org 0:5e1631496985 584 if (ofs >= plen)
root@mbed.org 0:5e1631496985 585 {
root@mbed.org 0:5e1631496985 586 /* next octet in next pbuf */
root@mbed.org 0:5e1631496985 587 p = p->next;
root@mbed.org 0:5e1631496985 588 if (p == NULL) { return ERR_ARG; }
root@mbed.org 0:5e1631496985 589 msg_ptr = p->payload;
root@mbed.org 0:5e1631496985 590 plen += p->len;
root@mbed.org 0:5e1631496985 591 }
root@mbed.org 0:5e1631496985 592 else
root@mbed.org 0:5e1631496985 593 {
root@mbed.org 0:5e1631496985 594 /* next octet in same pbuf */
root@mbed.org 0:5e1631496985 595 msg_ptr++;
root@mbed.org 0:5e1631496985 596 }
root@mbed.org 0:5e1631496985 597 }
root@mbed.org 0:5e1631496985 598 if (raw_len > 0)
root@mbed.org 0:5e1631496985 599 {
root@mbed.org 0:5e1631496985 600 /* copy last or single octet */
root@mbed.org 0:5e1631496985 601 *msg_ptr = *raw;
root@mbed.org 0:5e1631496985 602 }
root@mbed.org 0:5e1631496985 603 return ERR_OK;
root@mbed.org 0:5e1631496985 604 }
root@mbed.org 0:5e1631496985 605 p = p->next;
root@mbed.org 0:5e1631496985 606 }
root@mbed.org 0:5e1631496985 607 /* p == NULL, ofs >= plen */
root@mbed.org 0:5e1631496985 608 return ERR_ARG;
root@mbed.org 0:5e1631496985 609 }
root@mbed.org 0:5e1631496985 610
root@mbed.org 0:5e1631496985 611 #endif /* LWIP_SNMP */