Rod Coleman / NetServices

Netservices modded to read fragmented HTTP respsonse/payload from special purpose server - 180 bytes only

lwip/core/snmp/asn1_enc.c@0:8f5825f330b0, 2011-09-08 (annotated)

Committer:
RodColeman
Date:
Thu Sep 08 10:41:36 2011 +0000
Revision:
0:8f5825f330b0
setDataLen hacked to 180bytes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RodColeman 0:8f5825f330b0 1 /**
RodColeman 0:8f5825f330b0 2 * @file
RodColeman 0:8f5825f330b0 3 * Abstract Syntax Notation One (ISO 8824, 8825) encoding
RodColeman 0:8f5825f330b0 4 *
RodColeman 0:8f5825f330b0 5 * @todo not optimised (yet), favor correctness over speed, favor speed over size
RodColeman 0:8f5825f330b0 6 */
RodColeman 0:8f5825f330b0 7
RodColeman 0:8f5825f330b0 8 /*
RodColeman 0:8f5825f330b0 9 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
RodColeman 0:8f5825f330b0 10 * All rights reserved.
RodColeman 0:8f5825f330b0 11 *
RodColeman 0:8f5825f330b0 12 * Redistribution and use in source and binary forms, with or without modification,
RodColeman 0:8f5825f330b0 13 * are permitted provided that the following conditions are met:
RodColeman 0:8f5825f330b0 14 *
RodColeman 0:8f5825f330b0 15 * 1. Redistributions of source code must retain the above copyright notice,
RodColeman 0:8f5825f330b0 16 * this list of conditions and the following disclaimer.
RodColeman 0:8f5825f330b0 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
RodColeman 0:8f5825f330b0 18 * this list of conditions and the following disclaimer in the documentation
RodColeman 0:8f5825f330b0 19 * and/or other materials provided with the distribution.
RodColeman 0:8f5825f330b0 20 * 3. The name of the author may not be used to endorse or promote products
RodColeman 0:8f5825f330b0 21 * derived from this software without specific prior written permission.
RodColeman 0:8f5825f330b0 22 *
RodColeman 0:8f5825f330b0 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
RodColeman 0:8f5825f330b0 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
RodColeman 0:8f5825f330b0 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
RodColeman 0:8f5825f330b0 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
RodColeman 0:8f5825f330b0 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
RodColeman 0:8f5825f330b0 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
RodColeman 0:8f5825f330b0 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
RodColeman 0:8f5825f330b0 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
RodColeman 0:8f5825f330b0 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
RodColeman 0:8f5825f330b0 32 * OF SUCH DAMAGE.
RodColeman 0:8f5825f330b0 33 *
RodColeman 0:8f5825f330b0 34 * Author: Christiaan Simons <christiaan.simons@axon.tv>
RodColeman 0:8f5825f330b0 35 */
RodColeman 0:8f5825f330b0 36
RodColeman 0:8f5825f330b0 37 #include "lwip/opt.h"
RodColeman 0:8f5825f330b0 38
RodColeman 0:8f5825f330b0 39 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
RodColeman 0:8f5825f330b0 40
RodColeman 0:8f5825f330b0 41 #include "lwip/snmp_asn1.h"
RodColeman 0:8f5825f330b0 42
RodColeman 0:8f5825f330b0 43 /**
RodColeman 0:8f5825f330b0 44 * Returns octet count for length.
RodColeman 0:8f5825f330b0 45 *
RodColeman 0:8f5825f330b0 46 * @param length
RodColeman 0:8f5825f330b0 47 * @param octets_needed points to the return value
RodColeman 0:8f5825f330b0 48 */
RodColeman 0:8f5825f330b0 49 void
RodColeman 0:8f5825f330b0 50 snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed)
RodColeman 0:8f5825f330b0 51 {
RodColeman 0:8f5825f330b0 52 if (length < 0x80U)
RodColeman 0:8f5825f330b0 53 {
RodColeman 0:8f5825f330b0 54 *octets_needed = 1;
RodColeman 0:8f5825f330b0 55 }
RodColeman 0:8f5825f330b0 56 else if (length < 0x100U)
RodColeman 0:8f5825f330b0 57 {
RodColeman 0:8f5825f330b0 58 *octets_needed = 2;
RodColeman 0:8f5825f330b0 59 }
RodColeman 0:8f5825f330b0 60 else
RodColeman 0:8f5825f330b0 61 {
RodColeman 0:8f5825f330b0 62 *octets_needed = 3;
RodColeman 0:8f5825f330b0 63 }
RodColeman 0:8f5825f330b0 64 }
RodColeman 0:8f5825f330b0 65
RodColeman 0:8f5825f330b0 66 /**
RodColeman 0:8f5825f330b0 67 * Returns octet count for an u32_t.
RodColeman 0:8f5825f330b0 68 *
RodColeman 0:8f5825f330b0 69 * @param value
RodColeman 0:8f5825f330b0 70 * @param octets_needed points to the return value
RodColeman 0:8f5825f330b0 71 *
RodColeman 0:8f5825f330b0 72 * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded
RodColeman 0:8f5825f330b0 73 * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value
RodColeman 0:8f5825f330b0 74 * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!!
RodColeman 0:8f5825f330b0 75 */
RodColeman 0:8f5825f330b0 76 void
RodColeman 0:8f5825f330b0 77 snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed)
RodColeman 0:8f5825f330b0 78 {
RodColeman 0:8f5825f330b0 79 if (value < 0x80UL)
RodColeman 0:8f5825f330b0 80 {
RodColeman 0:8f5825f330b0 81 *octets_needed = 1;
RodColeman 0:8f5825f330b0 82 }
RodColeman 0:8f5825f330b0 83 else if (value < 0x8000UL)
RodColeman 0:8f5825f330b0 84 {
RodColeman 0:8f5825f330b0 85 *octets_needed = 2;
RodColeman 0:8f5825f330b0 86 }
RodColeman 0:8f5825f330b0 87 else if (value < 0x800000UL)
RodColeman 0:8f5825f330b0 88 {
RodColeman 0:8f5825f330b0 89 *octets_needed = 3;
RodColeman 0:8f5825f330b0 90 }
RodColeman 0:8f5825f330b0 91 else if (value < 0x80000000UL)
RodColeman 0:8f5825f330b0 92 {
RodColeman 0:8f5825f330b0 93 *octets_needed = 4;
RodColeman 0:8f5825f330b0 94 }
RodColeman 0:8f5825f330b0 95 else
RodColeman 0:8f5825f330b0 96 {
RodColeman 0:8f5825f330b0 97 *octets_needed = 5;
RodColeman 0:8f5825f330b0 98 }
RodColeman 0:8f5825f330b0 99 }
RodColeman 0:8f5825f330b0 100
RodColeman 0:8f5825f330b0 101 /**
RodColeman 0:8f5825f330b0 102 * Returns octet count for an s32_t.
RodColeman 0:8f5825f330b0 103 *
RodColeman 0:8f5825f330b0 104 * @param value
RodColeman 0:8f5825f330b0 105 * @param octets_needed points to the return value
RodColeman 0:8f5825f330b0 106 *
RodColeman 0:8f5825f330b0 107 * @note ASN coded integers are _always_ signed.
RodColeman 0:8f5825f330b0 108 */
RodColeman 0:8f5825f330b0 109 void
RodColeman 0:8f5825f330b0 110 snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed)
RodColeman 0:8f5825f330b0 111 {
RodColeman 0:8f5825f330b0 112 if (value < 0)
RodColeman 0:8f5825f330b0 113 {
RodColeman 0:8f5825f330b0 114 value = ~value;
RodColeman 0:8f5825f330b0 115 }
RodColeman 0:8f5825f330b0 116 if (value < 0x80L)
RodColeman 0:8f5825f330b0 117 {
RodColeman 0:8f5825f330b0 118 *octets_needed = 1;
RodColeman 0:8f5825f330b0 119 }
RodColeman 0:8f5825f330b0 120 else if (value < 0x8000L)
RodColeman 0:8f5825f330b0 121 {
RodColeman 0:8f5825f330b0 122 *octets_needed = 2;
RodColeman 0:8f5825f330b0 123 }
RodColeman 0:8f5825f330b0 124 else if (value < 0x800000L)
RodColeman 0:8f5825f330b0 125 {
RodColeman 0:8f5825f330b0 126 *octets_needed = 3;
RodColeman 0:8f5825f330b0 127 }
RodColeman 0:8f5825f330b0 128 else
RodColeman 0:8f5825f330b0 129 {
RodColeman 0:8f5825f330b0 130 *octets_needed = 4;
RodColeman 0:8f5825f330b0 131 }
RodColeman 0:8f5825f330b0 132 }
RodColeman 0:8f5825f330b0 133
RodColeman 0:8f5825f330b0 134 /**
RodColeman 0:8f5825f330b0 135 * Returns octet count for an object identifier.
RodColeman 0:8f5825f330b0 136 *
RodColeman 0:8f5825f330b0 137 * @param ident_len object identifier array length
RodColeman 0:8f5825f330b0 138 * @param ident points to object identifier array
RodColeman 0:8f5825f330b0 139 * @param octets_needed points to the return value
RodColeman 0:8f5825f330b0 140 */
RodColeman 0:8f5825f330b0 141 void
RodColeman 0:8f5825f330b0 142 snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed)
RodColeman 0:8f5825f330b0 143 {
RodColeman 0:8f5825f330b0 144 s32_t sub_id;
RodColeman 0:8f5825f330b0 145 u8_t cnt;
RodColeman 0:8f5825f330b0 146
RodColeman 0:8f5825f330b0 147 cnt = 0;
RodColeman 0:8f5825f330b0 148 if (ident_len > 1)
RodColeman 0:8f5825f330b0 149 {
RodColeman 0:8f5825f330b0 150 /* compressed prefix in one octet */
RodColeman 0:8f5825f330b0 151 cnt++;
RodColeman 0:8f5825f330b0 152 ident_len -= 2;
RodColeman 0:8f5825f330b0 153 ident += 2;
RodColeman 0:8f5825f330b0 154 }
RodColeman 0:8f5825f330b0 155 while(ident_len > 0)
RodColeman 0:8f5825f330b0 156 {
RodColeman 0:8f5825f330b0 157 ident_len--;
RodColeman 0:8f5825f330b0 158 sub_id = *ident;
RodColeman 0:8f5825f330b0 159
RodColeman 0:8f5825f330b0 160 sub_id >>= 7;
RodColeman 0:8f5825f330b0 161 cnt++;
RodColeman 0:8f5825f330b0 162 while(sub_id > 0)
RodColeman 0:8f5825f330b0 163 {
RodColeman 0:8f5825f330b0 164 sub_id >>= 7;
RodColeman 0:8f5825f330b0 165 cnt++;
RodColeman 0:8f5825f330b0 166 }
RodColeman 0:8f5825f330b0 167 ident++;
RodColeman 0:8f5825f330b0 168 }
RodColeman 0:8f5825f330b0 169 *octets_needed = cnt;
RodColeman 0:8f5825f330b0 170 }
RodColeman 0:8f5825f330b0 171
RodColeman 0:8f5825f330b0 172 /**
RodColeman 0:8f5825f330b0 173 * Encodes ASN type field into a pbuf chained ASN1 msg.
RodColeman 0:8f5825f330b0 174 *
RodColeman 0:8f5825f330b0 175 * @param p points to output pbuf to encode value into
RodColeman 0:8f5825f330b0 176 * @param ofs points to the offset within the pbuf chain
RodColeman 0:8f5825f330b0 177 * @param type input ASN1 type
RodColeman 0:8f5825f330b0 178 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
RodColeman 0:8f5825f330b0 179 */
RodColeman 0:8f5825f330b0 180 err_t
RodColeman 0:8f5825f330b0 181 snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type)
RodColeman 0:8f5825f330b0 182 {
RodColeman 0:8f5825f330b0 183 u16_t plen, base;
RodColeman 0:8f5825f330b0 184 u8_t *msg_ptr;
RodColeman 0:8f5825f330b0 185
RodColeman 0:8f5825f330b0 186 plen = 0;
RodColeman 0:8f5825f330b0 187 while (p != NULL)
RodColeman 0:8f5825f330b0 188 {
RodColeman 0:8f5825f330b0 189 base = plen;
RodColeman 0:8f5825f330b0 190 plen += p->len;
RodColeman 0:8f5825f330b0 191 if (ofs < plen)
RodColeman 0:8f5825f330b0 192 {
RodColeman 0:8f5825f330b0 193 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 194 msg_ptr += ofs - base;
RodColeman 0:8f5825f330b0 195 *msg_ptr = type;
RodColeman 0:8f5825f330b0 196 return ERR_OK;
RodColeman 0:8f5825f330b0 197 }
RodColeman 0:8f5825f330b0 198 p = p->next;
RodColeman 0:8f5825f330b0 199 }
RodColeman 0:8f5825f330b0 200 /* p == NULL, ofs >= plen */
RodColeman 0:8f5825f330b0 201 return ERR_ARG;
RodColeman 0:8f5825f330b0 202 }
RodColeman 0:8f5825f330b0 203
RodColeman 0:8f5825f330b0 204 /**
RodColeman 0:8f5825f330b0 205 * Encodes host order length field into a pbuf chained ASN1 msg.
RodColeman 0:8f5825f330b0 206 *
RodColeman 0:8f5825f330b0 207 * @param p points to output pbuf to encode length into
RodColeman 0:8f5825f330b0 208 * @param ofs points to the offset within the pbuf chain
RodColeman 0:8f5825f330b0 209 * @param length is the host order length to be encoded
RodColeman 0:8f5825f330b0 210 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
RodColeman 0:8f5825f330b0 211 */
RodColeman 0:8f5825f330b0 212 err_t
RodColeman 0:8f5825f330b0 213 snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length)
RodColeman 0:8f5825f330b0 214 {
RodColeman 0:8f5825f330b0 215 u16_t plen, base;
RodColeman 0:8f5825f330b0 216 u8_t *msg_ptr;
RodColeman 0:8f5825f330b0 217
RodColeman 0:8f5825f330b0 218 plen = 0;
RodColeman 0:8f5825f330b0 219 while (p != NULL)
RodColeman 0:8f5825f330b0 220 {
RodColeman 0:8f5825f330b0 221 base = plen;
RodColeman 0:8f5825f330b0 222 plen += p->len;
RodColeman 0:8f5825f330b0 223 if (ofs < plen)
RodColeman 0:8f5825f330b0 224 {
RodColeman 0:8f5825f330b0 225 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 226 msg_ptr += ofs - base;
RodColeman 0:8f5825f330b0 227
RodColeman 0:8f5825f330b0 228 if (length < 0x80)
RodColeman 0:8f5825f330b0 229 {
RodColeman 0:8f5825f330b0 230 *msg_ptr = (u8_t)length;
RodColeman 0:8f5825f330b0 231 return ERR_OK;
RodColeman 0:8f5825f330b0 232 }
RodColeman 0:8f5825f330b0 233 else if (length < 0x100)
RodColeman 0:8f5825f330b0 234 {
RodColeman 0:8f5825f330b0 235 *msg_ptr = 0x81;
RodColeman 0:8f5825f330b0 236 ofs += 1;
RodColeman 0:8f5825f330b0 237 if (ofs >= plen)
RodColeman 0:8f5825f330b0 238 {
RodColeman 0:8f5825f330b0 239 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 240 p = p->next;
RodColeman 0:8f5825f330b0 241 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 242 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 243 }
RodColeman 0:8f5825f330b0 244 else
RodColeman 0:8f5825f330b0 245 {
RodColeman 0:8f5825f330b0 246 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 247 msg_ptr++;
RodColeman 0:8f5825f330b0 248 }
RodColeman 0:8f5825f330b0 249 *msg_ptr = (u8_t)length;
RodColeman 0:8f5825f330b0 250 return ERR_OK;
RodColeman 0:8f5825f330b0 251 }
RodColeman 0:8f5825f330b0 252 else
RodColeman 0:8f5825f330b0 253 {
RodColeman 0:8f5825f330b0 254 u8_t i;
RodColeman 0:8f5825f330b0 255
RodColeman 0:8f5825f330b0 256 /* length >= 0x100 && length <= 0xFFFF */
RodColeman 0:8f5825f330b0 257 *msg_ptr = 0x82;
RodColeman 0:8f5825f330b0 258 i = 2;
RodColeman 0:8f5825f330b0 259 while (i > 0)
RodColeman 0:8f5825f330b0 260 {
RodColeman 0:8f5825f330b0 261 i--;
RodColeman 0:8f5825f330b0 262 ofs += 1;
RodColeman 0:8f5825f330b0 263 if (ofs >= plen)
RodColeman 0:8f5825f330b0 264 {
RodColeman 0:8f5825f330b0 265 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 266 p = p->next;
RodColeman 0:8f5825f330b0 267 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 268 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 269 plen += p->len;
RodColeman 0:8f5825f330b0 270 }
RodColeman 0:8f5825f330b0 271 else
RodColeman 0:8f5825f330b0 272 {
RodColeman 0:8f5825f330b0 273 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 274 msg_ptr++;
RodColeman 0:8f5825f330b0 275 }
RodColeman 0:8f5825f330b0 276 if (i == 0)
RodColeman 0:8f5825f330b0 277 {
RodColeman 0:8f5825f330b0 278 /* least significant length octet */
RodColeman 0:8f5825f330b0 279 *msg_ptr = (u8_t)length;
RodColeman 0:8f5825f330b0 280 }
RodColeman 0:8f5825f330b0 281 else
RodColeman 0:8f5825f330b0 282 {
RodColeman 0:8f5825f330b0 283 /* most significant length octet */
RodColeman 0:8f5825f330b0 284 *msg_ptr = (u8_t)(length >> 8);
RodColeman 0:8f5825f330b0 285 }
RodColeman 0:8f5825f330b0 286 }
RodColeman 0:8f5825f330b0 287 return ERR_OK;
RodColeman 0:8f5825f330b0 288 }
RodColeman 0:8f5825f330b0 289 }
RodColeman 0:8f5825f330b0 290 p = p->next;
RodColeman 0:8f5825f330b0 291 }
RodColeman 0:8f5825f330b0 292 /* p == NULL, ofs >= plen */
RodColeman 0:8f5825f330b0 293 return ERR_ARG;
RodColeman 0:8f5825f330b0 294 }
RodColeman 0:8f5825f330b0 295
RodColeman 0:8f5825f330b0 296 /**
RodColeman 0:8f5825f330b0 297 * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg.
RodColeman 0:8f5825f330b0 298 *
RodColeman 0:8f5825f330b0 299 * @param p points to output pbuf to encode value into
RodColeman 0:8f5825f330b0 300 * @param ofs points to the offset within the pbuf chain
RodColeman 0:8f5825f330b0 301 * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt())
RodColeman 0:8f5825f330b0 302 * @param value is the host order u32_t value to be encoded
RodColeman 0:8f5825f330b0 303 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
RodColeman 0:8f5825f330b0 304 *
RodColeman 0:8f5825f330b0 305 * @see snmp_asn1_enc_u32t_cnt()
RodColeman 0:8f5825f330b0 306 */
RodColeman 0:8f5825f330b0 307 err_t
RodColeman 0:8f5825f330b0 308 snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value)
RodColeman 0:8f5825f330b0 309 {
RodColeman 0:8f5825f330b0 310 u16_t plen, base;
RodColeman 0:8f5825f330b0 311 u8_t *msg_ptr;
RodColeman 0:8f5825f330b0 312
RodColeman 0:8f5825f330b0 313 plen = 0;
RodColeman 0:8f5825f330b0 314 while (p != NULL)
RodColeman 0:8f5825f330b0 315 {
RodColeman 0:8f5825f330b0 316 base = plen;
RodColeman 0:8f5825f330b0 317 plen += p->len;
RodColeman 0:8f5825f330b0 318 if (ofs < plen)
RodColeman 0:8f5825f330b0 319 {
RodColeman 0:8f5825f330b0 320 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 321 msg_ptr += ofs - base;
RodColeman 0:8f5825f330b0 322
RodColeman 0:8f5825f330b0 323 if (octets_needed == 5)
RodColeman 0:8f5825f330b0 324 {
RodColeman 0:8f5825f330b0 325 /* not enough bits in 'value' add leading 0x00 */
RodColeman 0:8f5825f330b0 326 octets_needed--;
RodColeman 0:8f5825f330b0 327 *msg_ptr = 0x00;
RodColeman 0:8f5825f330b0 328 ofs += 1;
RodColeman 0:8f5825f330b0 329 if (ofs >= plen)
RodColeman 0:8f5825f330b0 330 {
RodColeman 0:8f5825f330b0 331 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 332 p = p->next;
RodColeman 0:8f5825f330b0 333 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 334 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 335 plen += p->len;
RodColeman 0:8f5825f330b0 336 }
RodColeman 0:8f5825f330b0 337 else
RodColeman 0:8f5825f330b0 338 {
RodColeman 0:8f5825f330b0 339 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 340 msg_ptr++;
RodColeman 0:8f5825f330b0 341 }
RodColeman 0:8f5825f330b0 342 }
RodColeman 0:8f5825f330b0 343 while (octets_needed > 1)
RodColeman 0:8f5825f330b0 344 {
RodColeman 0:8f5825f330b0 345 octets_needed--;
RodColeman 0:8f5825f330b0 346 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
RodColeman 0:8f5825f330b0 347 ofs += 1;
RodColeman 0:8f5825f330b0 348 if (ofs >= plen)
RodColeman 0:8f5825f330b0 349 {
RodColeman 0:8f5825f330b0 350 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 351 p = p->next;
RodColeman 0:8f5825f330b0 352 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 353 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 354 plen += p->len;
RodColeman 0:8f5825f330b0 355 }
RodColeman 0:8f5825f330b0 356 else
RodColeman 0:8f5825f330b0 357 {
RodColeman 0:8f5825f330b0 358 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 359 msg_ptr++;
RodColeman 0:8f5825f330b0 360 }
RodColeman 0:8f5825f330b0 361 }
RodColeman 0:8f5825f330b0 362 /* (only) one least significant octet */
RodColeman 0:8f5825f330b0 363 *msg_ptr = (u8_t)value;
RodColeman 0:8f5825f330b0 364 return ERR_OK;
RodColeman 0:8f5825f330b0 365 }
RodColeman 0:8f5825f330b0 366 p = p->next;
RodColeman 0:8f5825f330b0 367 }
RodColeman 0:8f5825f330b0 368 /* p == NULL, ofs >= plen */
RodColeman 0:8f5825f330b0 369 return ERR_ARG;
RodColeman 0:8f5825f330b0 370 }
RodColeman 0:8f5825f330b0 371
RodColeman 0:8f5825f330b0 372 /**
RodColeman 0:8f5825f330b0 373 * Encodes s32_t integer into a pbuf chained ASN1 msg.
RodColeman 0:8f5825f330b0 374 *
RodColeman 0:8f5825f330b0 375 * @param p points to output pbuf to encode value into
RodColeman 0:8f5825f330b0 376 * @param ofs points to the offset within the pbuf chain
RodColeman 0:8f5825f330b0 377 * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt())
RodColeman 0:8f5825f330b0 378 * @param value is the host order s32_t value to be encoded
RodColeman 0:8f5825f330b0 379 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
RodColeman 0:8f5825f330b0 380 *
RodColeman 0:8f5825f330b0 381 * @see snmp_asn1_enc_s32t_cnt()
RodColeman 0:8f5825f330b0 382 */
RodColeman 0:8f5825f330b0 383 err_t
RodColeman 0:8f5825f330b0 384 snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value)
RodColeman 0:8f5825f330b0 385 {
RodColeman 0:8f5825f330b0 386 u16_t plen, base;
RodColeman 0:8f5825f330b0 387 u8_t *msg_ptr;
RodColeman 0:8f5825f330b0 388
RodColeman 0:8f5825f330b0 389 plen = 0;
RodColeman 0:8f5825f330b0 390 while (p != NULL)
RodColeman 0:8f5825f330b0 391 {
RodColeman 0:8f5825f330b0 392 base = plen;
RodColeman 0:8f5825f330b0 393 plen += p->len;
RodColeman 0:8f5825f330b0 394 if (ofs < plen)
RodColeman 0:8f5825f330b0 395 {
RodColeman 0:8f5825f330b0 396 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 397 msg_ptr += ofs - base;
RodColeman 0:8f5825f330b0 398
RodColeman 0:8f5825f330b0 399 while (octets_needed > 1)
RodColeman 0:8f5825f330b0 400 {
RodColeman 0:8f5825f330b0 401 octets_needed--;
RodColeman 0:8f5825f330b0 402 *msg_ptr = (u8_t)(value >> (octets_needed << 3));
RodColeman 0:8f5825f330b0 403 ofs += 1;
RodColeman 0:8f5825f330b0 404 if (ofs >= plen)
RodColeman 0:8f5825f330b0 405 {
RodColeman 0:8f5825f330b0 406 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 407 p = p->next;
RodColeman 0:8f5825f330b0 408 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 409 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 410 plen += p->len;
RodColeman 0:8f5825f330b0 411 }
RodColeman 0:8f5825f330b0 412 else
RodColeman 0:8f5825f330b0 413 {
RodColeman 0:8f5825f330b0 414 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 415 msg_ptr++;
RodColeman 0:8f5825f330b0 416 }
RodColeman 0:8f5825f330b0 417 }
RodColeman 0:8f5825f330b0 418 /* (only) one least significant octet */
RodColeman 0:8f5825f330b0 419 *msg_ptr = (u8_t)value;
RodColeman 0:8f5825f330b0 420 return ERR_OK;
RodColeman 0:8f5825f330b0 421 }
RodColeman 0:8f5825f330b0 422 p = p->next;
RodColeman 0:8f5825f330b0 423 }
RodColeman 0:8f5825f330b0 424 /* p == NULL, ofs >= plen */
RodColeman 0:8f5825f330b0 425 return ERR_ARG;
RodColeman 0:8f5825f330b0 426 }
RodColeman 0:8f5825f330b0 427
RodColeman 0:8f5825f330b0 428 /**
RodColeman 0:8f5825f330b0 429 * Encodes object identifier into a pbuf chained ASN1 msg.
RodColeman 0:8f5825f330b0 430 *
RodColeman 0:8f5825f330b0 431 * @param p points to output pbuf to encode oid into
RodColeman 0:8f5825f330b0 432 * @param ofs points to the offset within the pbuf chain
RodColeman 0:8f5825f330b0 433 * @param ident_len object identifier array length
RodColeman 0:8f5825f330b0 434 * @param ident points to object identifier array
RodColeman 0:8f5825f330b0 435 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
RodColeman 0:8f5825f330b0 436 */
RodColeman 0:8f5825f330b0 437 err_t
RodColeman 0:8f5825f330b0 438 snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident)
RodColeman 0:8f5825f330b0 439 {
RodColeman 0:8f5825f330b0 440 u16_t plen, base;
RodColeman 0:8f5825f330b0 441 u8_t *msg_ptr;
RodColeman 0:8f5825f330b0 442
RodColeman 0:8f5825f330b0 443 plen = 0;
RodColeman 0:8f5825f330b0 444 while (p != NULL)
RodColeman 0:8f5825f330b0 445 {
RodColeman 0:8f5825f330b0 446 base = plen;
RodColeman 0:8f5825f330b0 447 plen += p->len;
RodColeman 0:8f5825f330b0 448 if (ofs < plen)
RodColeman 0:8f5825f330b0 449 {
RodColeman 0:8f5825f330b0 450 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 451 msg_ptr += ofs - base;
RodColeman 0:8f5825f330b0 452
RodColeman 0:8f5825f330b0 453 if (ident_len > 1)
RodColeman 0:8f5825f330b0 454 {
RodColeman 0:8f5825f330b0 455 if ((ident[0] == 1) && (ident[1] == 3))
RodColeman 0:8f5825f330b0 456 {
RodColeman 0:8f5825f330b0 457 /* compressed (most common) prefix .iso.org */
RodColeman 0:8f5825f330b0 458 *msg_ptr = 0x2b;
RodColeman 0:8f5825f330b0 459 }
RodColeman 0:8f5825f330b0 460 else
RodColeman 0:8f5825f330b0 461 {
RodColeman 0:8f5825f330b0 462 /* calculate prefix */
RodColeman 0:8f5825f330b0 463 *msg_ptr = (u8_t)((ident[0] * 40) + ident[1]);
RodColeman 0:8f5825f330b0 464 }
RodColeman 0:8f5825f330b0 465 ofs += 1;
RodColeman 0:8f5825f330b0 466 if (ofs >= plen)
RodColeman 0:8f5825f330b0 467 {
RodColeman 0:8f5825f330b0 468 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 469 p = p->next;
RodColeman 0:8f5825f330b0 470 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 471 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 472 plen += p->len;
RodColeman 0:8f5825f330b0 473 }
RodColeman 0:8f5825f330b0 474 else
RodColeman 0:8f5825f330b0 475 {
RodColeman 0:8f5825f330b0 476 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 477 msg_ptr++;
RodColeman 0:8f5825f330b0 478 }
RodColeman 0:8f5825f330b0 479 ident_len -= 2;
RodColeman 0:8f5825f330b0 480 ident += 2;
RodColeman 0:8f5825f330b0 481 }
RodColeman 0:8f5825f330b0 482 else
RodColeman 0:8f5825f330b0 483 {
RodColeman 0:8f5825f330b0 484 /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */
RodColeman 0:8f5825f330b0 485 /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */
RodColeman 0:8f5825f330b0 486 return ERR_ARG;
RodColeman 0:8f5825f330b0 487 }
RodColeman 0:8f5825f330b0 488 while (ident_len > 0)
RodColeman 0:8f5825f330b0 489 {
RodColeman 0:8f5825f330b0 490 s32_t sub_id;
RodColeman 0:8f5825f330b0 491 u8_t shift, tail;
RodColeman 0:8f5825f330b0 492
RodColeman 0:8f5825f330b0 493 ident_len--;
RodColeman 0:8f5825f330b0 494 sub_id = *ident;
RodColeman 0:8f5825f330b0 495 tail = 0;
RodColeman 0:8f5825f330b0 496 shift = 28;
RodColeman 0:8f5825f330b0 497 while(shift > 0)
RodColeman 0:8f5825f330b0 498 {
RodColeman 0:8f5825f330b0 499 u8_t code;
RodColeman 0:8f5825f330b0 500
RodColeman 0:8f5825f330b0 501 code = (u8_t)(sub_id >> shift);
RodColeman 0:8f5825f330b0 502 if ((code != 0) || (tail != 0))
RodColeman 0:8f5825f330b0 503 {
RodColeman 0:8f5825f330b0 504 tail = 1;
RodColeman 0:8f5825f330b0 505 *msg_ptr = code | 0x80;
RodColeman 0:8f5825f330b0 506 ofs += 1;
RodColeman 0:8f5825f330b0 507 if (ofs >= plen)
RodColeman 0:8f5825f330b0 508 {
RodColeman 0:8f5825f330b0 509 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 510 p = p->next;
RodColeman 0:8f5825f330b0 511 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 512 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 513 plen += p->len;
RodColeman 0:8f5825f330b0 514 }
RodColeman 0:8f5825f330b0 515 else
RodColeman 0:8f5825f330b0 516 {
RodColeman 0:8f5825f330b0 517 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 518 msg_ptr++;
RodColeman 0:8f5825f330b0 519 }
RodColeman 0:8f5825f330b0 520 }
RodColeman 0:8f5825f330b0 521 shift -= 7;
RodColeman 0:8f5825f330b0 522 }
RodColeman 0:8f5825f330b0 523 *msg_ptr = (u8_t)sub_id & 0x7F;
RodColeman 0:8f5825f330b0 524 if (ident_len > 0)
RodColeman 0:8f5825f330b0 525 {
RodColeman 0:8f5825f330b0 526 ofs += 1;
RodColeman 0:8f5825f330b0 527 if (ofs >= plen)
RodColeman 0:8f5825f330b0 528 {
RodColeman 0:8f5825f330b0 529 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 530 p = p->next;
RodColeman 0:8f5825f330b0 531 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 532 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 533 plen += p->len;
RodColeman 0:8f5825f330b0 534 }
RodColeman 0:8f5825f330b0 535 else
RodColeman 0:8f5825f330b0 536 {
RodColeman 0:8f5825f330b0 537 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 538 msg_ptr++;
RodColeman 0:8f5825f330b0 539 }
RodColeman 0:8f5825f330b0 540 }
RodColeman 0:8f5825f330b0 541 /* proceed to next sub-identifier */
RodColeman 0:8f5825f330b0 542 ident++;
RodColeman 0:8f5825f330b0 543 }
RodColeman 0:8f5825f330b0 544 return ERR_OK;
RodColeman 0:8f5825f330b0 545 }
RodColeman 0:8f5825f330b0 546 p = p->next;
RodColeman 0:8f5825f330b0 547 }
RodColeman 0:8f5825f330b0 548 /* p == NULL, ofs >= plen */
RodColeman 0:8f5825f330b0 549 return ERR_ARG;
RodColeman 0:8f5825f330b0 550 }
RodColeman 0:8f5825f330b0 551
RodColeman 0:8f5825f330b0 552 /**
RodColeman 0:8f5825f330b0 553 * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg.
RodColeman 0:8f5825f330b0 554 *
RodColeman 0:8f5825f330b0 555 * @param p points to output pbuf to encode raw data into
RodColeman 0:8f5825f330b0 556 * @param ofs points to the offset within the pbuf chain
RodColeman 0:8f5825f330b0 557 * @param raw_len raw data length
RodColeman 0:8f5825f330b0 558 * @param raw points raw data
RodColeman 0:8f5825f330b0 559 * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode
RodColeman 0:8f5825f330b0 560 */
RodColeman 0:8f5825f330b0 561 err_t
RodColeman 0:8f5825f330b0 562 snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw)
RodColeman 0:8f5825f330b0 563 {
RodColeman 0:8f5825f330b0 564 u16_t plen, base;
RodColeman 0:8f5825f330b0 565 u8_t *msg_ptr;
RodColeman 0:8f5825f330b0 566
RodColeman 0:8f5825f330b0 567 plen = 0;
RodColeman 0:8f5825f330b0 568 while (p != NULL)
RodColeman 0:8f5825f330b0 569 {
RodColeman 0:8f5825f330b0 570 base = plen;
RodColeman 0:8f5825f330b0 571 plen += p->len;
RodColeman 0:8f5825f330b0 572 if (ofs < plen)
RodColeman 0:8f5825f330b0 573 {
RodColeman 0:8f5825f330b0 574 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 575 msg_ptr += ofs - base;
RodColeman 0:8f5825f330b0 576
RodColeman 0:8f5825f330b0 577 while (raw_len > 1)
RodColeman 0:8f5825f330b0 578 {
RodColeman 0:8f5825f330b0 579 /* copy raw_len - 1 octets */
RodColeman 0:8f5825f330b0 580 raw_len--;
RodColeman 0:8f5825f330b0 581 *msg_ptr = *raw;
RodColeman 0:8f5825f330b0 582 raw++;
RodColeman 0:8f5825f330b0 583 ofs += 1;
RodColeman 0:8f5825f330b0 584 if (ofs >= plen)
RodColeman 0:8f5825f330b0 585 {
RodColeman 0:8f5825f330b0 586 /* next octet in next pbuf */
RodColeman 0:8f5825f330b0 587 p = p->next;
RodColeman 0:8f5825f330b0 588 if (p == NULL) { return ERR_ARG; }
RodColeman 0:8f5825f330b0 589 msg_ptr = (u8_t*)p->payload;
RodColeman 0:8f5825f330b0 590 plen += p->len;
RodColeman 0:8f5825f330b0 591 }
RodColeman 0:8f5825f330b0 592 else
RodColeman 0:8f5825f330b0 593 {
RodColeman 0:8f5825f330b0 594 /* next octet in same pbuf */
RodColeman 0:8f5825f330b0 595 msg_ptr++;
RodColeman 0:8f5825f330b0 596 }
RodColeman 0:8f5825f330b0 597 }
RodColeman 0:8f5825f330b0 598 if (raw_len > 0)
RodColeman 0:8f5825f330b0 599 {
RodColeman 0:8f5825f330b0 600 /* copy last or single octet */
RodColeman 0:8f5825f330b0 601 *msg_ptr = *raw;
RodColeman 0:8f5825f330b0 602 }
RodColeman 0:8f5825f330b0 603 return ERR_OK;
RodColeman 0:8f5825f330b0 604 }
RodColeman 0:8f5825f330b0 605 p = p->next;
RodColeman 0:8f5825f330b0 606 }
RodColeman 0:8f5825f330b0 607 /* p == NULL, ofs >= plen */
RodColeman 0:8f5825f330b0 608 return ERR_ARG;
RodColeman 0:8f5825f330b0 609 }
RodColeman 0:8f5825f330b0 610
RodColeman 0:8f5825f330b0 611 #endif /* LWIP_SNMP */