Donatien Garnier
ZG2100 Network interface source
lwip/core/snmp/asn1_enc.c@0:b802fc31f1db, 2010-07-09 (annotated)
- Committer:
- donatien
- Date:
- Fri Jul 09 15:37:23 2010 +0000
- Revision:
- 0:b802fc31f1db
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| donatien | 0:b802fc31f1db | 1 | /** |
| donatien | 0:b802fc31f1db | 2 | * @file |
| donatien | 0:b802fc31f1db | 3 | * Abstract Syntax Notation One (ISO 8824, 8825) encoding |
| donatien | 0:b802fc31f1db | 4 | * |
| donatien | 0:b802fc31f1db | 5 | * @todo not optimised (yet), favor correctness over speed, favor speed over size |
| donatien | 0:b802fc31f1db | 6 | */ |
| donatien | 0:b802fc31f1db | 7 | |
| donatien | 0:b802fc31f1db | 8 | /* |
| donatien | 0:b802fc31f1db | 9 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands. |
| donatien | 0:b802fc31f1db | 10 | * All rights reserved. |
| donatien | 0:b802fc31f1db | 11 | * |
| donatien | 0:b802fc31f1db | 12 | * Redistribution and use in source and binary forms, with or without modification, |
| donatien | 0:b802fc31f1db | 13 | * are permitted provided that the following conditions are met: |
| donatien | 0:b802fc31f1db | 14 | * |
| donatien | 0:b802fc31f1db | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
| donatien | 0:b802fc31f1db | 16 | * this list of conditions and the following disclaimer. |
| donatien | 0:b802fc31f1db | 17 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| donatien | 0:b802fc31f1db | 18 | * this list of conditions and the following disclaimer in the documentation |
| donatien | 0:b802fc31f1db | 19 | * and/or other materials provided with the distribution. |
| donatien | 0:b802fc31f1db | 20 | * 3. The name of the author may not be used to endorse or promote products |
| donatien | 0:b802fc31f1db | 21 | * derived from this software without specific prior written permission. |
| donatien | 0:b802fc31f1db | 22 | * |
| donatien | 0:b802fc31f1db | 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| donatien | 0:b802fc31f1db | 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| donatien | 0:b802fc31f1db | 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| donatien | 0:b802fc31f1db | 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| donatien | 0:b802fc31f1db | 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| donatien | 0:b802fc31f1db | 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| donatien | 0:b802fc31f1db | 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| donatien | 0:b802fc31f1db | 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| donatien | 0:b802fc31f1db | 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| donatien | 0:b802fc31f1db | 32 | * OF SUCH DAMAGE. |
| donatien | 0:b802fc31f1db | 33 | * |
| donatien | 0:b802fc31f1db | 34 | * Author: Christiaan Simons <christiaan.simons@axon.tv> |
| donatien | 0:b802fc31f1db | 35 | */ |
| donatien | 0:b802fc31f1db | 36 | |
| donatien | 0:b802fc31f1db | 37 | #include "lwip/opt.h" |
| donatien | 0:b802fc31f1db | 38 | |
| donatien | 0:b802fc31f1db | 39 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */ |
| donatien | 0:b802fc31f1db | 40 | |
| donatien | 0:b802fc31f1db | 41 | #include "lwip/snmp_asn1.h" |
| donatien | 0:b802fc31f1db | 42 | |
| donatien | 0:b802fc31f1db | 43 | /** |
| donatien | 0:b802fc31f1db | 44 | * Returns octet count for length. |
| donatien | 0:b802fc31f1db | 45 | * |
| donatien | 0:b802fc31f1db | 46 | * @param length |
| donatien | 0:b802fc31f1db | 47 | * @param octets_needed points to the return value |
| donatien | 0:b802fc31f1db | 48 | */ |
| donatien | 0:b802fc31f1db | 49 | void |
| donatien | 0:b802fc31f1db | 50 | snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed) |
| donatien | 0:b802fc31f1db | 51 | { |
| donatien | 0:b802fc31f1db | 52 | if (length < 0x80U) |
| donatien | 0:b802fc31f1db | 53 | { |
| donatien | 0:b802fc31f1db | 54 | *octets_needed = 1; |
| donatien | 0:b802fc31f1db | 55 | } |
| donatien | 0:b802fc31f1db | 56 | else if (length < 0x100U) |
| donatien | 0:b802fc31f1db | 57 | { |
| donatien | 0:b802fc31f1db | 58 | *octets_needed = 2; |
| donatien | 0:b802fc31f1db | 59 | } |
| donatien | 0:b802fc31f1db | 60 | else |
| donatien | 0:b802fc31f1db | 61 | { |
| donatien | 0:b802fc31f1db | 62 | *octets_needed = 3; |
| donatien | 0:b802fc31f1db | 63 | } |
| donatien | 0:b802fc31f1db | 64 | } |
| donatien | 0:b802fc31f1db | 65 | |
| donatien | 0:b802fc31f1db | 66 | /** |
| donatien | 0:b802fc31f1db | 67 | * Returns octet count for an u32_t. |
| donatien | 0:b802fc31f1db | 68 | * |
| donatien | 0:b802fc31f1db | 69 | * @param value |
| donatien | 0:b802fc31f1db | 70 | * @param octets_needed points to the return value |
| donatien | 0:b802fc31f1db | 71 | * |
| donatien | 0:b802fc31f1db | 72 | * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded |
| donatien | 0:b802fc31f1db | 73 | * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value |
| donatien | 0:b802fc31f1db | 74 | * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!! |
| donatien | 0:b802fc31f1db | 75 | */ |
| donatien | 0:b802fc31f1db | 76 | void |
| donatien | 0:b802fc31f1db | 77 | snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed) |
| donatien | 0:b802fc31f1db | 78 | { |
| donatien | 0:b802fc31f1db | 79 | if (value < 0x80UL) |
| donatien | 0:b802fc31f1db | 80 | { |
| donatien | 0:b802fc31f1db | 81 | *octets_needed = 1; |
| donatien | 0:b802fc31f1db | 82 | } |
| donatien | 0:b802fc31f1db | 83 | else if (value < 0x8000UL) |
| donatien | 0:b802fc31f1db | 84 | { |
| donatien | 0:b802fc31f1db | 85 | *octets_needed = 2; |
| donatien | 0:b802fc31f1db | 86 | } |
| donatien | 0:b802fc31f1db | 87 | else if (value < 0x800000UL) |
| donatien | 0:b802fc31f1db | 88 | { |
| donatien | 0:b802fc31f1db | 89 | *octets_needed = 3; |
| donatien | 0:b802fc31f1db | 90 | } |
| donatien | 0:b802fc31f1db | 91 | else if (value < 0x80000000UL) |
| donatien | 0:b802fc31f1db | 92 | { |
| donatien | 0:b802fc31f1db | 93 | *octets_needed = 4; |
| donatien | 0:b802fc31f1db | 94 | } |
| donatien | 0:b802fc31f1db | 95 | else |
| donatien | 0:b802fc31f1db | 96 | { |
| donatien | 0:b802fc31f1db | 97 | *octets_needed = 5; |
| donatien | 0:b802fc31f1db | 98 | } |
| donatien | 0:b802fc31f1db | 99 | } |
| donatien | 0:b802fc31f1db | 100 | |
| donatien | 0:b802fc31f1db | 101 | /** |
| donatien | 0:b802fc31f1db | 102 | * Returns octet count for an s32_t. |
| donatien | 0:b802fc31f1db | 103 | * |
| donatien | 0:b802fc31f1db | 104 | * @param value |
| donatien | 0:b802fc31f1db | 105 | * @param octets_needed points to the return value |
| donatien | 0:b802fc31f1db | 106 | * |
| donatien | 0:b802fc31f1db | 107 | * @note ASN coded integers are _always_ signed. |
| donatien | 0:b802fc31f1db | 108 | */ |
| donatien | 0:b802fc31f1db | 109 | void |
| donatien | 0:b802fc31f1db | 110 | snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed) |
| donatien | 0:b802fc31f1db | 111 | { |
| donatien | 0:b802fc31f1db | 112 | if (value < 0) |
| donatien | 0:b802fc31f1db | 113 | { |
| donatien | 0:b802fc31f1db | 114 | value = ~value; |
| donatien | 0:b802fc31f1db | 115 | } |
| donatien | 0:b802fc31f1db | 116 | if (value < 0x80L) |
| donatien | 0:b802fc31f1db | 117 | { |
| donatien | 0:b802fc31f1db | 118 | *octets_needed = 1; |
| donatien | 0:b802fc31f1db | 119 | } |
| donatien | 0:b802fc31f1db | 120 | else if (value < 0x8000L) |
| donatien | 0:b802fc31f1db | 121 | { |
| donatien | 0:b802fc31f1db | 122 | *octets_needed = 2; |
| donatien | 0:b802fc31f1db | 123 | } |
| donatien | 0:b802fc31f1db | 124 | else if (value < 0x800000L) |
| donatien | 0:b802fc31f1db | 125 | { |
| donatien | 0:b802fc31f1db | 126 | *octets_needed = 3; |
| donatien | 0:b802fc31f1db | 127 | } |
| donatien | 0:b802fc31f1db | 128 | else |
| donatien | 0:b802fc31f1db | 129 | { |
| donatien | 0:b802fc31f1db | 130 | *octets_needed = 4; |
| donatien | 0:b802fc31f1db | 131 | } |
| donatien | 0:b802fc31f1db | 132 | } |
| donatien | 0:b802fc31f1db | 133 | |
| donatien | 0:b802fc31f1db | 134 | /** |
| donatien | 0:b802fc31f1db | 135 | * Returns octet count for an object identifier. |
| donatien | 0:b802fc31f1db | 136 | * |
| donatien | 0:b802fc31f1db | 137 | * @param ident_len object identifier array length |
| donatien | 0:b802fc31f1db | 138 | * @param ident points to object identifier array |
| donatien | 0:b802fc31f1db | 139 | * @param octets_needed points to the return value |
| donatien | 0:b802fc31f1db | 140 | */ |
| donatien | 0:b802fc31f1db | 141 | void |
| donatien | 0:b802fc31f1db | 142 | snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed) |
| donatien | 0:b802fc31f1db | 143 | { |
| donatien | 0:b802fc31f1db | 144 | s32_t sub_id; |
| donatien | 0:b802fc31f1db | 145 | u8_t cnt; |
| donatien | 0:b802fc31f1db | 146 | |
| donatien | 0:b802fc31f1db | 147 | cnt = 0; |
| donatien | 0:b802fc31f1db | 148 | if (ident_len > 1) |
| donatien | 0:b802fc31f1db | 149 | { |
| donatien | 0:b802fc31f1db | 150 | /* compressed prefix in one octet */ |
| donatien | 0:b802fc31f1db | 151 | cnt++; |
| donatien | 0:b802fc31f1db | 152 | ident_len -= 2; |
| donatien | 0:b802fc31f1db | 153 | ident += 2; |
| donatien | 0:b802fc31f1db | 154 | } |
| donatien | 0:b802fc31f1db | 155 | while(ident_len > 0) |
| donatien | 0:b802fc31f1db | 156 | { |
| donatien | 0:b802fc31f1db | 157 | ident_len--; |
| donatien | 0:b802fc31f1db | 158 | sub_id = *ident; |
| donatien | 0:b802fc31f1db | 159 | |
| donatien | 0:b802fc31f1db | 160 | sub_id >>= 7; |
| donatien | 0:b802fc31f1db | 161 | cnt++; |
| donatien | 0:b802fc31f1db | 162 | while(sub_id > 0) |
| donatien | 0:b802fc31f1db | 163 | { |
| donatien | 0:b802fc31f1db | 164 | sub_id >>= 7; |
| donatien | 0:b802fc31f1db | 165 | cnt++; |
| donatien | 0:b802fc31f1db | 166 | } |
| donatien | 0:b802fc31f1db | 167 | ident++; |
| donatien | 0:b802fc31f1db | 168 | } |
| donatien | 0:b802fc31f1db | 169 | *octets_needed = cnt; |
| donatien | 0:b802fc31f1db | 170 | } |
| donatien | 0:b802fc31f1db | 171 | |
| donatien | 0:b802fc31f1db | 172 | /** |
| donatien | 0:b802fc31f1db | 173 | * Encodes ASN type field into a pbuf chained ASN1 msg. |
| donatien | 0:b802fc31f1db | 174 | * |
| donatien | 0:b802fc31f1db | 175 | * @param p points to output pbuf to encode value into |
| donatien | 0:b802fc31f1db | 176 | * @param ofs points to the offset within the pbuf chain |
| donatien | 0:b802fc31f1db | 177 | * @param type input ASN1 type |
| donatien | 0:b802fc31f1db | 178 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
| donatien | 0:b802fc31f1db | 179 | */ |
| donatien | 0:b802fc31f1db | 180 | err_t |
| donatien | 0:b802fc31f1db | 181 | snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type) |
| donatien | 0:b802fc31f1db | 182 | { |
| donatien | 0:b802fc31f1db | 183 | u16_t plen, base; |
| donatien | 0:b802fc31f1db | 184 | u8_t *msg_ptr; |
| donatien | 0:b802fc31f1db | 185 | |
| donatien | 0:b802fc31f1db | 186 | plen = 0; |
| donatien | 0:b802fc31f1db | 187 | while (p != NULL) |
| donatien | 0:b802fc31f1db | 188 | { |
| donatien | 0:b802fc31f1db | 189 | base = plen; |
| donatien | 0:b802fc31f1db | 190 | plen += p->len; |
| donatien | 0:b802fc31f1db | 191 | if (ofs < plen) |
| donatien | 0:b802fc31f1db | 192 | { |
| donatien | 0:b802fc31f1db | 193 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 194 | msg_ptr += ofs - base; |
| donatien | 0:b802fc31f1db | 195 | *msg_ptr = type; |
| donatien | 0:b802fc31f1db | 196 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 197 | } |
| donatien | 0:b802fc31f1db | 198 | p = p->next; |
| donatien | 0:b802fc31f1db | 199 | } |
| donatien | 0:b802fc31f1db | 200 | /* p == NULL, ofs >= plen */ |
| donatien | 0:b802fc31f1db | 201 | return ERR_ARG; |
| donatien | 0:b802fc31f1db | 202 | } |
| donatien | 0:b802fc31f1db | 203 | |
| donatien | 0:b802fc31f1db | 204 | /** |
| donatien | 0:b802fc31f1db | 205 | * Encodes host order length field into a pbuf chained ASN1 msg. |
| donatien | 0:b802fc31f1db | 206 | * |
| donatien | 0:b802fc31f1db | 207 | * @param p points to output pbuf to encode length into |
| donatien | 0:b802fc31f1db | 208 | * @param ofs points to the offset within the pbuf chain |
| donatien | 0:b802fc31f1db | 209 | * @param length is the host order length to be encoded |
| donatien | 0:b802fc31f1db | 210 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
| donatien | 0:b802fc31f1db | 211 | */ |
| donatien | 0:b802fc31f1db | 212 | err_t |
| donatien | 0:b802fc31f1db | 213 | snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length) |
| donatien | 0:b802fc31f1db | 214 | { |
| donatien | 0:b802fc31f1db | 215 | u16_t plen, base; |
| donatien | 0:b802fc31f1db | 216 | u8_t *msg_ptr; |
| donatien | 0:b802fc31f1db | 217 | |
| donatien | 0:b802fc31f1db | 218 | plen = 0; |
| donatien | 0:b802fc31f1db | 219 | while (p != NULL) |
| donatien | 0:b802fc31f1db | 220 | { |
| donatien | 0:b802fc31f1db | 221 | base = plen; |
| donatien | 0:b802fc31f1db | 222 | plen += p->len; |
| donatien | 0:b802fc31f1db | 223 | if (ofs < plen) |
| donatien | 0:b802fc31f1db | 224 | { |
| donatien | 0:b802fc31f1db | 225 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 226 | msg_ptr += ofs - base; |
| donatien | 0:b802fc31f1db | 227 | |
| donatien | 0:b802fc31f1db | 228 | if (length < 0x80) |
| donatien | 0:b802fc31f1db | 229 | { |
| donatien | 0:b802fc31f1db | 230 | *msg_ptr = (u8_t)length; |
| donatien | 0:b802fc31f1db | 231 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 232 | } |
| donatien | 0:b802fc31f1db | 233 | else if (length < 0x100) |
| donatien | 0:b802fc31f1db | 234 | { |
| donatien | 0:b802fc31f1db | 235 | *msg_ptr = 0x81; |
| donatien | 0:b802fc31f1db | 236 | ofs += 1; |
| donatien | 0:b802fc31f1db | 237 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 238 | { |
| donatien | 0:b802fc31f1db | 239 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 240 | p = p->next; |
| donatien | 0:b802fc31f1db | 241 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 242 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 243 | } |
| donatien | 0:b802fc31f1db | 244 | else |
| donatien | 0:b802fc31f1db | 245 | { |
| donatien | 0:b802fc31f1db | 246 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 247 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 248 | } |
| donatien | 0:b802fc31f1db | 249 | *msg_ptr = (u8_t)length; |
| donatien | 0:b802fc31f1db | 250 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 251 | } |
| donatien | 0:b802fc31f1db | 252 | else |
| donatien | 0:b802fc31f1db | 253 | { |
| donatien | 0:b802fc31f1db | 254 | u8_t i; |
| donatien | 0:b802fc31f1db | 255 | |
| donatien | 0:b802fc31f1db | 256 | /* length >= 0x100 && length <= 0xFFFF */ |
| donatien | 0:b802fc31f1db | 257 | *msg_ptr = 0x82; |
| donatien | 0:b802fc31f1db | 258 | i = 2; |
| donatien | 0:b802fc31f1db | 259 | while (i > 0) |
| donatien | 0:b802fc31f1db | 260 | { |
| donatien | 0:b802fc31f1db | 261 | i--; |
| donatien | 0:b802fc31f1db | 262 | ofs += 1; |
| donatien | 0:b802fc31f1db | 263 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 264 | { |
| donatien | 0:b802fc31f1db | 265 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 266 | p = p->next; |
| donatien | 0:b802fc31f1db | 267 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 268 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 269 | plen += p->len; |
| donatien | 0:b802fc31f1db | 270 | } |
| donatien | 0:b802fc31f1db | 271 | else |
| donatien | 0:b802fc31f1db | 272 | { |
| donatien | 0:b802fc31f1db | 273 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 274 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 275 | } |
| donatien | 0:b802fc31f1db | 276 | if (i == 0) |
| donatien | 0:b802fc31f1db | 277 | { |
| donatien | 0:b802fc31f1db | 278 | /* least significant length octet */ |
| donatien | 0:b802fc31f1db | 279 | *msg_ptr = (u8_t)length; |
| donatien | 0:b802fc31f1db | 280 | } |
| donatien | 0:b802fc31f1db | 281 | else |
| donatien | 0:b802fc31f1db | 282 | { |
| donatien | 0:b802fc31f1db | 283 | /* most significant length octet */ |
| donatien | 0:b802fc31f1db | 284 | *msg_ptr = (u8_t)(length >> 8); |
| donatien | 0:b802fc31f1db | 285 | } |
| donatien | 0:b802fc31f1db | 286 | } |
| donatien | 0:b802fc31f1db | 287 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 288 | } |
| donatien | 0:b802fc31f1db | 289 | } |
| donatien | 0:b802fc31f1db | 290 | p = p->next; |
| donatien | 0:b802fc31f1db | 291 | } |
| donatien | 0:b802fc31f1db | 292 | /* p == NULL, ofs >= plen */ |
| donatien | 0:b802fc31f1db | 293 | return ERR_ARG; |
| donatien | 0:b802fc31f1db | 294 | } |
| donatien | 0:b802fc31f1db | 295 | |
| donatien | 0:b802fc31f1db | 296 | /** |
| donatien | 0:b802fc31f1db | 297 | * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg. |
| donatien | 0:b802fc31f1db | 298 | * |
| donatien | 0:b802fc31f1db | 299 | * @param p points to output pbuf to encode value into |
| donatien | 0:b802fc31f1db | 300 | * @param ofs points to the offset within the pbuf chain |
| donatien | 0:b802fc31f1db | 301 | * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt()) |
| donatien | 0:b802fc31f1db | 302 | * @param value is the host order u32_t value to be encoded |
| donatien | 0:b802fc31f1db | 303 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
| donatien | 0:b802fc31f1db | 304 | * |
| donatien | 0:b802fc31f1db | 305 | * @see snmp_asn1_enc_u32t_cnt() |
| donatien | 0:b802fc31f1db | 306 | */ |
| donatien | 0:b802fc31f1db | 307 | err_t |
| donatien | 0:b802fc31f1db | 308 | snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value) |
| donatien | 0:b802fc31f1db | 309 | { |
| donatien | 0:b802fc31f1db | 310 | u16_t plen, base; |
| donatien | 0:b802fc31f1db | 311 | u8_t *msg_ptr; |
| donatien | 0:b802fc31f1db | 312 | |
| donatien | 0:b802fc31f1db | 313 | plen = 0; |
| donatien | 0:b802fc31f1db | 314 | while (p != NULL) |
| donatien | 0:b802fc31f1db | 315 | { |
| donatien | 0:b802fc31f1db | 316 | base = plen; |
| donatien | 0:b802fc31f1db | 317 | plen += p->len; |
| donatien | 0:b802fc31f1db | 318 | if (ofs < plen) |
| donatien | 0:b802fc31f1db | 319 | { |
| donatien | 0:b802fc31f1db | 320 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 321 | msg_ptr += ofs - base; |
| donatien | 0:b802fc31f1db | 322 | |
| donatien | 0:b802fc31f1db | 323 | if (octets_needed == 5) |
| donatien | 0:b802fc31f1db | 324 | { |
| donatien | 0:b802fc31f1db | 325 | /* not enough bits in 'value' add leading 0x00 */ |
| donatien | 0:b802fc31f1db | 326 | octets_needed--; |
| donatien | 0:b802fc31f1db | 327 | *msg_ptr = 0x00; |
| donatien | 0:b802fc31f1db | 328 | ofs += 1; |
| donatien | 0:b802fc31f1db | 329 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 330 | { |
| donatien | 0:b802fc31f1db | 331 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 332 | p = p->next; |
| donatien | 0:b802fc31f1db | 333 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 334 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 335 | plen += p->len; |
| donatien | 0:b802fc31f1db | 336 | } |
| donatien | 0:b802fc31f1db | 337 | else |
| donatien | 0:b802fc31f1db | 338 | { |
| donatien | 0:b802fc31f1db | 339 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 340 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 341 | } |
| donatien | 0:b802fc31f1db | 342 | } |
| donatien | 0:b802fc31f1db | 343 | while (octets_needed > 1) |
| donatien | 0:b802fc31f1db | 344 | { |
| donatien | 0:b802fc31f1db | 345 | octets_needed--; |
| donatien | 0:b802fc31f1db | 346 | *msg_ptr = (u8_t)(value >> (octets_needed << 3)); |
| donatien | 0:b802fc31f1db | 347 | ofs += 1; |
| donatien | 0:b802fc31f1db | 348 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 349 | { |
| donatien | 0:b802fc31f1db | 350 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 351 | p = p->next; |
| donatien | 0:b802fc31f1db | 352 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 353 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 354 | plen += p->len; |
| donatien | 0:b802fc31f1db | 355 | } |
| donatien | 0:b802fc31f1db | 356 | else |
| donatien | 0:b802fc31f1db | 357 | { |
| donatien | 0:b802fc31f1db | 358 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 359 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 360 | } |
| donatien | 0:b802fc31f1db | 361 | } |
| donatien | 0:b802fc31f1db | 362 | /* (only) one least significant octet */ |
| donatien | 0:b802fc31f1db | 363 | *msg_ptr = (u8_t)value; |
| donatien | 0:b802fc31f1db | 364 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 365 | } |
| donatien | 0:b802fc31f1db | 366 | p = p->next; |
| donatien | 0:b802fc31f1db | 367 | } |
| donatien | 0:b802fc31f1db | 368 | /* p == NULL, ofs >= plen */ |
| donatien | 0:b802fc31f1db | 369 | return ERR_ARG; |
| donatien | 0:b802fc31f1db | 370 | } |
| donatien | 0:b802fc31f1db | 371 | |
| donatien | 0:b802fc31f1db | 372 | /** |
| donatien | 0:b802fc31f1db | 373 | * Encodes s32_t integer into a pbuf chained ASN1 msg. |
| donatien | 0:b802fc31f1db | 374 | * |
| donatien | 0:b802fc31f1db | 375 | * @param p points to output pbuf to encode value into |
| donatien | 0:b802fc31f1db | 376 | * @param ofs points to the offset within the pbuf chain |
| donatien | 0:b802fc31f1db | 377 | * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt()) |
| donatien | 0:b802fc31f1db | 378 | * @param value is the host order s32_t value to be encoded |
| donatien | 0:b802fc31f1db | 379 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
| donatien | 0:b802fc31f1db | 380 | * |
| donatien | 0:b802fc31f1db | 381 | * @see snmp_asn1_enc_s32t_cnt() |
| donatien | 0:b802fc31f1db | 382 | */ |
| donatien | 0:b802fc31f1db | 383 | err_t |
| donatien | 0:b802fc31f1db | 384 | snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value) |
| donatien | 0:b802fc31f1db | 385 | { |
| donatien | 0:b802fc31f1db | 386 | u16_t plen, base; |
| donatien | 0:b802fc31f1db | 387 | u8_t *msg_ptr; |
| donatien | 0:b802fc31f1db | 388 | |
| donatien | 0:b802fc31f1db | 389 | plen = 0; |
| donatien | 0:b802fc31f1db | 390 | while (p != NULL) |
| donatien | 0:b802fc31f1db | 391 | { |
| donatien | 0:b802fc31f1db | 392 | base = plen; |
| donatien | 0:b802fc31f1db | 393 | plen += p->len; |
| donatien | 0:b802fc31f1db | 394 | if (ofs < plen) |
| donatien | 0:b802fc31f1db | 395 | { |
| donatien | 0:b802fc31f1db | 396 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 397 | msg_ptr += ofs - base; |
| donatien | 0:b802fc31f1db | 398 | |
| donatien | 0:b802fc31f1db | 399 | while (octets_needed > 1) |
| donatien | 0:b802fc31f1db | 400 | { |
| donatien | 0:b802fc31f1db | 401 | octets_needed--; |
| donatien | 0:b802fc31f1db | 402 | *msg_ptr = (u8_t)(value >> (octets_needed << 3)); |
| donatien | 0:b802fc31f1db | 403 | ofs += 1; |
| donatien | 0:b802fc31f1db | 404 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 405 | { |
| donatien | 0:b802fc31f1db | 406 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 407 | p = p->next; |
| donatien | 0:b802fc31f1db | 408 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 409 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 410 | plen += p->len; |
| donatien | 0:b802fc31f1db | 411 | } |
| donatien | 0:b802fc31f1db | 412 | else |
| donatien | 0:b802fc31f1db | 413 | { |
| donatien | 0:b802fc31f1db | 414 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 415 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 416 | } |
| donatien | 0:b802fc31f1db | 417 | } |
| donatien | 0:b802fc31f1db | 418 | /* (only) one least significant octet */ |
| donatien | 0:b802fc31f1db | 419 | *msg_ptr = (u8_t)value; |
| donatien | 0:b802fc31f1db | 420 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 421 | } |
| donatien | 0:b802fc31f1db | 422 | p = p->next; |
| donatien | 0:b802fc31f1db | 423 | } |
| donatien | 0:b802fc31f1db | 424 | /* p == NULL, ofs >= plen */ |
| donatien | 0:b802fc31f1db | 425 | return ERR_ARG; |
| donatien | 0:b802fc31f1db | 426 | } |
| donatien | 0:b802fc31f1db | 427 | |
| donatien | 0:b802fc31f1db | 428 | /** |
| donatien | 0:b802fc31f1db | 429 | * Encodes object identifier into a pbuf chained ASN1 msg. |
| donatien | 0:b802fc31f1db | 430 | * |
| donatien | 0:b802fc31f1db | 431 | * @param p points to output pbuf to encode oid into |
| donatien | 0:b802fc31f1db | 432 | * @param ofs points to the offset within the pbuf chain |
| donatien | 0:b802fc31f1db | 433 | * @param ident_len object identifier array length |
| donatien | 0:b802fc31f1db | 434 | * @param ident points to object identifier array |
| donatien | 0:b802fc31f1db | 435 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
| donatien | 0:b802fc31f1db | 436 | */ |
| donatien | 0:b802fc31f1db | 437 | err_t |
| donatien | 0:b802fc31f1db | 438 | snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident) |
| donatien | 0:b802fc31f1db | 439 | { |
| donatien | 0:b802fc31f1db | 440 | u16_t plen, base; |
| donatien | 0:b802fc31f1db | 441 | u8_t *msg_ptr; |
| donatien | 0:b802fc31f1db | 442 | |
| donatien | 0:b802fc31f1db | 443 | plen = 0; |
| donatien | 0:b802fc31f1db | 444 | while (p != NULL) |
| donatien | 0:b802fc31f1db | 445 | { |
| donatien | 0:b802fc31f1db | 446 | base = plen; |
| donatien | 0:b802fc31f1db | 447 | plen += p->len; |
| donatien | 0:b802fc31f1db | 448 | if (ofs < plen) |
| donatien | 0:b802fc31f1db | 449 | { |
| donatien | 0:b802fc31f1db | 450 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 451 | msg_ptr += ofs - base; |
| donatien | 0:b802fc31f1db | 452 | |
| donatien | 0:b802fc31f1db | 453 | if (ident_len > 1) |
| donatien | 0:b802fc31f1db | 454 | { |
| donatien | 0:b802fc31f1db | 455 | if ((ident[0] == 1) && (ident[1] == 3)) |
| donatien | 0:b802fc31f1db | 456 | { |
| donatien | 0:b802fc31f1db | 457 | /* compressed (most common) prefix .iso.org */ |
| donatien | 0:b802fc31f1db | 458 | *msg_ptr = 0x2b; |
| donatien | 0:b802fc31f1db | 459 | } |
| donatien | 0:b802fc31f1db | 460 | else |
| donatien | 0:b802fc31f1db | 461 | { |
| donatien | 0:b802fc31f1db | 462 | /* calculate prefix */ |
| donatien | 0:b802fc31f1db | 463 | *msg_ptr = (u8_t)((ident[0] * 40) + ident[1]); |
| donatien | 0:b802fc31f1db | 464 | } |
| donatien | 0:b802fc31f1db | 465 | ofs += 1; |
| donatien | 0:b802fc31f1db | 466 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 467 | { |
| donatien | 0:b802fc31f1db | 468 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 469 | p = p->next; |
| donatien | 0:b802fc31f1db | 470 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 471 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 472 | plen += p->len; |
| donatien | 0:b802fc31f1db | 473 | } |
| donatien | 0:b802fc31f1db | 474 | else |
| donatien | 0:b802fc31f1db | 475 | { |
| donatien | 0:b802fc31f1db | 476 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 477 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 478 | } |
| donatien | 0:b802fc31f1db | 479 | ident_len -= 2; |
| donatien | 0:b802fc31f1db | 480 | ident += 2; |
| donatien | 0:b802fc31f1db | 481 | } |
| donatien | 0:b802fc31f1db | 482 | else |
| donatien | 0:b802fc31f1db | 483 | { |
| donatien | 0:b802fc31f1db | 484 | /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */ |
| donatien | 0:b802fc31f1db | 485 | /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */ |
| donatien | 0:b802fc31f1db | 486 | return ERR_ARG; |
| donatien | 0:b802fc31f1db | 487 | } |
| donatien | 0:b802fc31f1db | 488 | while (ident_len > 0) |
| donatien | 0:b802fc31f1db | 489 | { |
| donatien | 0:b802fc31f1db | 490 | s32_t sub_id; |
| donatien | 0:b802fc31f1db | 491 | u8_t shift, tail; |
| donatien | 0:b802fc31f1db | 492 | |
| donatien | 0:b802fc31f1db | 493 | ident_len--; |
| donatien | 0:b802fc31f1db | 494 | sub_id = *ident; |
| donatien | 0:b802fc31f1db | 495 | tail = 0; |
| donatien | 0:b802fc31f1db | 496 | shift = 28; |
| donatien | 0:b802fc31f1db | 497 | while(shift > 0) |
| donatien | 0:b802fc31f1db | 498 | { |
| donatien | 0:b802fc31f1db | 499 | u8_t code; |
| donatien | 0:b802fc31f1db | 500 | |
| donatien | 0:b802fc31f1db | 501 | code = (u8_t)(sub_id >> shift); |
| donatien | 0:b802fc31f1db | 502 | if ((code != 0) || (tail != 0)) |
| donatien | 0:b802fc31f1db | 503 | { |
| donatien | 0:b802fc31f1db | 504 | tail = 1; |
| donatien | 0:b802fc31f1db | 505 | *msg_ptr = code | 0x80; |
| donatien | 0:b802fc31f1db | 506 | ofs += 1; |
| donatien | 0:b802fc31f1db | 507 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 508 | { |
| donatien | 0:b802fc31f1db | 509 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 510 | p = p->next; |
| donatien | 0:b802fc31f1db | 511 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 512 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 513 | plen += p->len; |
| donatien | 0:b802fc31f1db | 514 | } |
| donatien | 0:b802fc31f1db | 515 | else |
| donatien | 0:b802fc31f1db | 516 | { |
| donatien | 0:b802fc31f1db | 517 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 518 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 519 | } |
| donatien | 0:b802fc31f1db | 520 | } |
| donatien | 0:b802fc31f1db | 521 | shift -= 7; |
| donatien | 0:b802fc31f1db | 522 | } |
| donatien | 0:b802fc31f1db | 523 | *msg_ptr = (u8_t)sub_id & 0x7F; |
| donatien | 0:b802fc31f1db | 524 | if (ident_len > 0) |
| donatien | 0:b802fc31f1db | 525 | { |
| donatien | 0:b802fc31f1db | 526 | ofs += 1; |
| donatien | 0:b802fc31f1db | 527 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 528 | { |
| donatien | 0:b802fc31f1db | 529 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 530 | p = p->next; |
| donatien | 0:b802fc31f1db | 531 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 532 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 533 | plen += p->len; |
| donatien | 0:b802fc31f1db | 534 | } |
| donatien | 0:b802fc31f1db | 535 | else |
| donatien | 0:b802fc31f1db | 536 | { |
| donatien | 0:b802fc31f1db | 537 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 538 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 539 | } |
| donatien | 0:b802fc31f1db | 540 | } |
| donatien | 0:b802fc31f1db | 541 | /* proceed to next sub-identifier */ |
| donatien | 0:b802fc31f1db | 542 | ident++; |
| donatien | 0:b802fc31f1db | 543 | } |
| donatien | 0:b802fc31f1db | 544 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 545 | } |
| donatien | 0:b802fc31f1db | 546 | p = p->next; |
| donatien | 0:b802fc31f1db | 547 | } |
| donatien | 0:b802fc31f1db | 548 | /* p == NULL, ofs >= plen */ |
| donatien | 0:b802fc31f1db | 549 | return ERR_ARG; |
| donatien | 0:b802fc31f1db | 550 | } |
| donatien | 0:b802fc31f1db | 551 | |
| donatien | 0:b802fc31f1db | 552 | /** |
| donatien | 0:b802fc31f1db | 553 | * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg. |
| donatien | 0:b802fc31f1db | 554 | * |
| donatien | 0:b802fc31f1db | 555 | * @param p points to output pbuf to encode raw data into |
| donatien | 0:b802fc31f1db | 556 | * @param ofs points to the offset within the pbuf chain |
| donatien | 0:b802fc31f1db | 557 | * @param raw_len raw data length |
| donatien | 0:b802fc31f1db | 558 | * @param raw points raw data |
| donatien | 0:b802fc31f1db | 559 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
| donatien | 0:b802fc31f1db | 560 | */ |
| donatien | 0:b802fc31f1db | 561 | err_t |
| donatien | 0:b802fc31f1db | 562 | snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw) |
| donatien | 0:b802fc31f1db | 563 | { |
| donatien | 0:b802fc31f1db | 564 | u16_t plen, base; |
| donatien | 0:b802fc31f1db | 565 | u8_t *msg_ptr; |
| donatien | 0:b802fc31f1db | 566 | |
| donatien | 0:b802fc31f1db | 567 | plen = 0; |
| donatien | 0:b802fc31f1db | 568 | while (p != NULL) |
| donatien | 0:b802fc31f1db | 569 | { |
| donatien | 0:b802fc31f1db | 570 | base = plen; |
| donatien | 0:b802fc31f1db | 571 | plen += p->len; |
| donatien | 0:b802fc31f1db | 572 | if (ofs < plen) |
| donatien | 0:b802fc31f1db | 573 | { |
| donatien | 0:b802fc31f1db | 574 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 575 | msg_ptr += ofs - base; |
| donatien | 0:b802fc31f1db | 576 | |
| donatien | 0:b802fc31f1db | 577 | while (raw_len > 1) |
| donatien | 0:b802fc31f1db | 578 | { |
| donatien | 0:b802fc31f1db | 579 | /* copy raw_len - 1 octets */ |
| donatien | 0:b802fc31f1db | 580 | raw_len--; |
| donatien | 0:b802fc31f1db | 581 | *msg_ptr = *raw; |
| donatien | 0:b802fc31f1db | 582 | raw++; |
| donatien | 0:b802fc31f1db | 583 | ofs += 1; |
| donatien | 0:b802fc31f1db | 584 | if (ofs >= plen) |
| donatien | 0:b802fc31f1db | 585 | { |
| donatien | 0:b802fc31f1db | 586 | /* next octet in next pbuf */ |
| donatien | 0:b802fc31f1db | 587 | p = p->next; |
| donatien | 0:b802fc31f1db | 588 | if (p == NULL) { return ERR_ARG; } |
| donatien | 0:b802fc31f1db | 589 | msg_ptr = (u8_t*)p->payload; |
| donatien | 0:b802fc31f1db | 590 | plen += p->len; |
| donatien | 0:b802fc31f1db | 591 | } |
| donatien | 0:b802fc31f1db | 592 | else |
| donatien | 0:b802fc31f1db | 593 | { |
| donatien | 0:b802fc31f1db | 594 | /* next octet in same pbuf */ |
| donatien | 0:b802fc31f1db | 595 | msg_ptr++; |
| donatien | 0:b802fc31f1db | 596 | } |
| donatien | 0:b802fc31f1db | 597 | } |
| donatien | 0:b802fc31f1db | 598 | if (raw_len > 0) |
| donatien | 0:b802fc31f1db | 599 | { |
| donatien | 0:b802fc31f1db | 600 | /* copy last or single octet */ |
| donatien | 0:b802fc31f1db | 601 | *msg_ptr = *raw; |
| donatien | 0:b802fc31f1db | 602 | } |
| donatien | 0:b802fc31f1db | 603 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 604 | } |
| donatien | 0:b802fc31f1db | 605 | p = p->next; |
| donatien | 0:b802fc31f1db | 606 | } |
| donatien | 0:b802fc31f1db | 607 | /* p == NULL, ofs >= plen */ |
| donatien | 0:b802fc31f1db | 608 | return ERR_ARG; |
| donatien | 0:b802fc31f1db | 609 | } |
| donatien | 0:b802fc31f1db | 610 | |
| donatien | 0:b802fc31f1db | 611 | #endif /* LWIP_SNMP */ |