My fork of the HTTPServer (working)
Core/lwIP/core/snmp/asn1_enc.c@1:284f2df30cf9, 2012-11-20 (annotated)
- Committer:
- screamer
- Date:
- Tue Nov 20 12:18:53 2012 +0000
- Revision:
- 1:284f2df30cf9
- Parent:
- 0:7a64fbb4069d
local changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
screamer | 0:7a64fbb4069d | 1 | /** |
screamer | 0:7a64fbb4069d | 2 | * @file |
screamer | 0:7a64fbb4069d | 3 | * Abstract Syntax Notation One (ISO 8824, 8825) encoding |
screamer | 0:7a64fbb4069d | 4 | * |
screamer | 0:7a64fbb4069d | 5 | * @todo not optimised (yet), favor correctness over speed, favor speed over size |
screamer | 0:7a64fbb4069d | 6 | */ |
screamer | 0:7a64fbb4069d | 7 | |
screamer | 0:7a64fbb4069d | 8 | /* |
screamer | 0:7a64fbb4069d | 9 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands. |
screamer | 0:7a64fbb4069d | 10 | * All rights reserved. |
screamer | 0:7a64fbb4069d | 11 | * |
screamer | 0:7a64fbb4069d | 12 | * Redistribution and use in source and binary forms, with or without modification, |
screamer | 0:7a64fbb4069d | 13 | * are permitted provided that the following conditions are met: |
screamer | 0:7a64fbb4069d | 14 | * |
screamer | 0:7a64fbb4069d | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
screamer | 0:7a64fbb4069d | 16 | * this list of conditions and the following disclaimer. |
screamer | 0:7a64fbb4069d | 17 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
screamer | 0:7a64fbb4069d | 18 | * this list of conditions and the following disclaimer in the documentation |
screamer | 0:7a64fbb4069d | 19 | * and/or other materials provided with the distribution. |
screamer | 0:7a64fbb4069d | 20 | * 3. The name of the author may not be used to endorse or promote products |
screamer | 0:7a64fbb4069d | 21 | * derived from this software without specific prior written permission. |
screamer | 0:7a64fbb4069d | 22 | * |
screamer | 0:7a64fbb4069d | 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
screamer | 0:7a64fbb4069d | 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
screamer | 0:7a64fbb4069d | 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
screamer | 0:7a64fbb4069d | 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
screamer | 0:7a64fbb4069d | 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
screamer | 0:7a64fbb4069d | 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
screamer | 0:7a64fbb4069d | 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
screamer | 0:7a64fbb4069d | 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
screamer | 0:7a64fbb4069d | 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
screamer | 0:7a64fbb4069d | 32 | * OF SUCH DAMAGE. |
screamer | 0:7a64fbb4069d | 33 | * |
screamer | 0:7a64fbb4069d | 34 | * Author: Christiaan Simons <christiaan.simons@axon.tv> |
screamer | 0:7a64fbb4069d | 35 | */ |
screamer | 0:7a64fbb4069d | 36 | |
screamer | 0:7a64fbb4069d | 37 | #include "lwip/opt.h" |
screamer | 0:7a64fbb4069d | 38 | |
screamer | 0:7a64fbb4069d | 39 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */ |
screamer | 0:7a64fbb4069d | 40 | |
screamer | 0:7a64fbb4069d | 41 | #include "lwip/snmp_asn1.h" |
screamer | 0:7a64fbb4069d | 42 | |
screamer | 0:7a64fbb4069d | 43 | /** |
screamer | 0:7a64fbb4069d | 44 | * Returns octet count for length. |
screamer | 0:7a64fbb4069d | 45 | * |
screamer | 0:7a64fbb4069d | 46 | * @param length |
screamer | 0:7a64fbb4069d | 47 | * @param octets_needed points to the return value |
screamer | 0:7a64fbb4069d | 48 | */ |
screamer | 0:7a64fbb4069d | 49 | void |
screamer | 0:7a64fbb4069d | 50 | snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed) |
screamer | 0:7a64fbb4069d | 51 | { |
screamer | 0:7a64fbb4069d | 52 | if (length < 0x80U) |
screamer | 0:7a64fbb4069d | 53 | { |
screamer | 0:7a64fbb4069d | 54 | *octets_needed = 1; |
screamer | 0:7a64fbb4069d | 55 | } |
screamer | 0:7a64fbb4069d | 56 | else if (length < 0x100U) |
screamer | 0:7a64fbb4069d | 57 | { |
screamer | 0:7a64fbb4069d | 58 | *octets_needed = 2; |
screamer | 0:7a64fbb4069d | 59 | } |
screamer | 0:7a64fbb4069d | 60 | else |
screamer | 0:7a64fbb4069d | 61 | { |
screamer | 0:7a64fbb4069d | 62 | *octets_needed = 3; |
screamer | 0:7a64fbb4069d | 63 | } |
screamer | 0:7a64fbb4069d | 64 | } |
screamer | 0:7a64fbb4069d | 65 | |
screamer | 0:7a64fbb4069d | 66 | /** |
screamer | 0:7a64fbb4069d | 67 | * Returns octet count for an u32_t. |
screamer | 0:7a64fbb4069d | 68 | * |
screamer | 0:7a64fbb4069d | 69 | * @param value |
screamer | 0:7a64fbb4069d | 70 | * @param octets_needed points to the return value |
screamer | 0:7a64fbb4069d | 71 | * |
screamer | 0:7a64fbb4069d | 72 | * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded |
screamer | 0:7a64fbb4069d | 73 | * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value |
screamer | 0:7a64fbb4069d | 74 | * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!! |
screamer | 0:7a64fbb4069d | 75 | */ |
screamer | 0:7a64fbb4069d | 76 | void |
screamer | 0:7a64fbb4069d | 77 | snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed) |
screamer | 0:7a64fbb4069d | 78 | { |
screamer | 0:7a64fbb4069d | 79 | if (value < 0x80UL) |
screamer | 0:7a64fbb4069d | 80 | { |
screamer | 0:7a64fbb4069d | 81 | *octets_needed = 1; |
screamer | 0:7a64fbb4069d | 82 | } |
screamer | 0:7a64fbb4069d | 83 | else if (value < 0x8000UL) |
screamer | 0:7a64fbb4069d | 84 | { |
screamer | 0:7a64fbb4069d | 85 | *octets_needed = 2; |
screamer | 0:7a64fbb4069d | 86 | } |
screamer | 0:7a64fbb4069d | 87 | else if (value < 0x800000UL) |
screamer | 0:7a64fbb4069d | 88 | { |
screamer | 0:7a64fbb4069d | 89 | *octets_needed = 3; |
screamer | 0:7a64fbb4069d | 90 | } |
screamer | 0:7a64fbb4069d | 91 | else if (value < 0x80000000UL) |
screamer | 0:7a64fbb4069d | 92 | { |
screamer | 0:7a64fbb4069d | 93 | *octets_needed = 4; |
screamer | 0:7a64fbb4069d | 94 | } |
screamer | 0:7a64fbb4069d | 95 | else |
screamer | 0:7a64fbb4069d | 96 | { |
screamer | 0:7a64fbb4069d | 97 | *octets_needed = 5; |
screamer | 0:7a64fbb4069d | 98 | } |
screamer | 0:7a64fbb4069d | 99 | } |
screamer | 0:7a64fbb4069d | 100 | |
screamer | 0:7a64fbb4069d | 101 | /** |
screamer | 0:7a64fbb4069d | 102 | * Returns octet count for an s32_t. |
screamer | 0:7a64fbb4069d | 103 | * |
screamer | 0:7a64fbb4069d | 104 | * @param value |
screamer | 0:7a64fbb4069d | 105 | * @param octets_needed points to the return value |
screamer | 0:7a64fbb4069d | 106 | * |
screamer | 0:7a64fbb4069d | 107 | * @note ASN coded integers are _always_ signed. |
screamer | 0:7a64fbb4069d | 108 | */ |
screamer | 0:7a64fbb4069d | 109 | void |
screamer | 0:7a64fbb4069d | 110 | snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed) |
screamer | 0:7a64fbb4069d | 111 | { |
screamer | 0:7a64fbb4069d | 112 | if (value < 0) |
screamer | 0:7a64fbb4069d | 113 | { |
screamer | 0:7a64fbb4069d | 114 | value = ~value; |
screamer | 0:7a64fbb4069d | 115 | } |
screamer | 0:7a64fbb4069d | 116 | if (value < 0x80L) |
screamer | 0:7a64fbb4069d | 117 | { |
screamer | 0:7a64fbb4069d | 118 | *octets_needed = 1; |
screamer | 0:7a64fbb4069d | 119 | } |
screamer | 0:7a64fbb4069d | 120 | else if (value < 0x8000L) |
screamer | 0:7a64fbb4069d | 121 | { |
screamer | 0:7a64fbb4069d | 122 | *octets_needed = 2; |
screamer | 0:7a64fbb4069d | 123 | } |
screamer | 0:7a64fbb4069d | 124 | else if (value < 0x800000L) |
screamer | 0:7a64fbb4069d | 125 | { |
screamer | 0:7a64fbb4069d | 126 | *octets_needed = 3; |
screamer | 0:7a64fbb4069d | 127 | } |
screamer | 0:7a64fbb4069d | 128 | else |
screamer | 0:7a64fbb4069d | 129 | { |
screamer | 0:7a64fbb4069d | 130 | *octets_needed = 4; |
screamer | 0:7a64fbb4069d | 131 | } |
screamer | 0:7a64fbb4069d | 132 | } |
screamer | 0:7a64fbb4069d | 133 | |
screamer | 0:7a64fbb4069d | 134 | /** |
screamer | 0:7a64fbb4069d | 135 | * Returns octet count for an object identifier. |
screamer | 0:7a64fbb4069d | 136 | * |
screamer | 0:7a64fbb4069d | 137 | * @param ident_len object identifier array length |
screamer | 0:7a64fbb4069d | 138 | * @param ident points to object identifier array |
screamer | 0:7a64fbb4069d | 139 | * @param octets_needed points to the return value |
screamer | 0:7a64fbb4069d | 140 | */ |
screamer | 0:7a64fbb4069d | 141 | void |
screamer | 0:7a64fbb4069d | 142 | snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed) |
screamer | 0:7a64fbb4069d | 143 | { |
screamer | 0:7a64fbb4069d | 144 | s32_t sub_id; |
screamer | 0:7a64fbb4069d | 145 | u8_t cnt; |
screamer | 0:7a64fbb4069d | 146 | |
screamer | 0:7a64fbb4069d | 147 | cnt = 0; |
screamer | 0:7a64fbb4069d | 148 | if (ident_len > 1) |
screamer | 0:7a64fbb4069d | 149 | { |
screamer | 0:7a64fbb4069d | 150 | /* compressed prefix in one octet */ |
screamer | 0:7a64fbb4069d | 151 | cnt++; |
screamer | 0:7a64fbb4069d | 152 | ident_len -= 2; |
screamer | 0:7a64fbb4069d | 153 | ident += 2; |
screamer | 0:7a64fbb4069d | 154 | } |
screamer | 0:7a64fbb4069d | 155 | while(ident_len > 0) |
screamer | 0:7a64fbb4069d | 156 | { |
screamer | 0:7a64fbb4069d | 157 | ident_len--; |
screamer | 0:7a64fbb4069d | 158 | sub_id = *ident; |
screamer | 0:7a64fbb4069d | 159 | |
screamer | 0:7a64fbb4069d | 160 | sub_id >>= 7; |
screamer | 0:7a64fbb4069d | 161 | cnt++; |
screamer | 0:7a64fbb4069d | 162 | while(sub_id > 0) |
screamer | 0:7a64fbb4069d | 163 | { |
screamer | 0:7a64fbb4069d | 164 | sub_id >>= 7; |
screamer | 0:7a64fbb4069d | 165 | cnt++; |
screamer | 0:7a64fbb4069d | 166 | } |
screamer | 0:7a64fbb4069d | 167 | ident++; |
screamer | 0:7a64fbb4069d | 168 | } |
screamer | 0:7a64fbb4069d | 169 | *octets_needed = cnt; |
screamer | 0:7a64fbb4069d | 170 | } |
screamer | 0:7a64fbb4069d | 171 | |
screamer | 0:7a64fbb4069d | 172 | /** |
screamer | 0:7a64fbb4069d | 173 | * Encodes ASN type field into a pbuf chained ASN1 msg. |
screamer | 0:7a64fbb4069d | 174 | * |
screamer | 0:7a64fbb4069d | 175 | * @param p points to output pbuf to encode value into |
screamer | 0:7a64fbb4069d | 176 | * @param ofs points to the offset within the pbuf chain |
screamer | 0:7a64fbb4069d | 177 | * @param type input ASN1 type |
screamer | 0:7a64fbb4069d | 178 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
screamer | 0:7a64fbb4069d | 179 | */ |
screamer | 0:7a64fbb4069d | 180 | err_t |
screamer | 0:7a64fbb4069d | 181 | snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type) |
screamer | 0:7a64fbb4069d | 182 | { |
screamer | 0:7a64fbb4069d | 183 | u16_t plen, base; |
screamer | 0:7a64fbb4069d | 184 | u8_t *msg_ptr; |
screamer | 0:7a64fbb4069d | 185 | |
screamer | 0:7a64fbb4069d | 186 | plen = 0; |
screamer | 0:7a64fbb4069d | 187 | while (p != NULL) |
screamer | 0:7a64fbb4069d | 188 | { |
screamer | 0:7a64fbb4069d | 189 | base = plen; |
screamer | 0:7a64fbb4069d | 190 | plen += p->len; |
screamer | 0:7a64fbb4069d | 191 | if (ofs < plen) |
screamer | 0:7a64fbb4069d | 192 | { |
screamer | 0:7a64fbb4069d | 193 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 194 | msg_ptr += ofs - base; |
screamer | 0:7a64fbb4069d | 195 | *msg_ptr = type; |
screamer | 0:7a64fbb4069d | 196 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 197 | } |
screamer | 0:7a64fbb4069d | 198 | p = p->next; |
screamer | 0:7a64fbb4069d | 199 | } |
screamer | 0:7a64fbb4069d | 200 | /* p == NULL, ofs >= plen */ |
screamer | 0:7a64fbb4069d | 201 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 202 | } |
screamer | 0:7a64fbb4069d | 203 | |
screamer | 0:7a64fbb4069d | 204 | /** |
screamer | 0:7a64fbb4069d | 205 | * Encodes host order length field into a pbuf chained ASN1 msg. |
screamer | 0:7a64fbb4069d | 206 | * |
screamer | 0:7a64fbb4069d | 207 | * @param p points to output pbuf to encode length into |
screamer | 0:7a64fbb4069d | 208 | * @param ofs points to the offset within the pbuf chain |
screamer | 0:7a64fbb4069d | 209 | * @param length is the host order length to be encoded |
screamer | 0:7a64fbb4069d | 210 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
screamer | 0:7a64fbb4069d | 211 | */ |
screamer | 0:7a64fbb4069d | 212 | err_t |
screamer | 0:7a64fbb4069d | 213 | snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length) |
screamer | 0:7a64fbb4069d | 214 | { |
screamer | 0:7a64fbb4069d | 215 | u16_t plen, base; |
screamer | 0:7a64fbb4069d | 216 | u8_t *msg_ptr; |
screamer | 0:7a64fbb4069d | 217 | |
screamer | 0:7a64fbb4069d | 218 | plen = 0; |
screamer | 0:7a64fbb4069d | 219 | while (p != NULL) |
screamer | 0:7a64fbb4069d | 220 | { |
screamer | 0:7a64fbb4069d | 221 | base = plen; |
screamer | 0:7a64fbb4069d | 222 | plen += p->len; |
screamer | 0:7a64fbb4069d | 223 | if (ofs < plen) |
screamer | 0:7a64fbb4069d | 224 | { |
screamer | 0:7a64fbb4069d | 225 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 226 | msg_ptr += ofs - base; |
screamer | 0:7a64fbb4069d | 227 | |
screamer | 0:7a64fbb4069d | 228 | if (length < 0x80) |
screamer | 0:7a64fbb4069d | 229 | { |
screamer | 0:7a64fbb4069d | 230 | *msg_ptr = length; |
screamer | 0:7a64fbb4069d | 231 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 232 | } |
screamer | 0:7a64fbb4069d | 233 | else if (length < 0x100) |
screamer | 0:7a64fbb4069d | 234 | { |
screamer | 0:7a64fbb4069d | 235 | *msg_ptr = 0x81; |
screamer | 0:7a64fbb4069d | 236 | ofs += 1; |
screamer | 0:7a64fbb4069d | 237 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 238 | { |
screamer | 0:7a64fbb4069d | 239 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 240 | p = p->next; |
screamer | 0:7a64fbb4069d | 241 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 242 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 243 | } |
screamer | 0:7a64fbb4069d | 244 | else |
screamer | 0:7a64fbb4069d | 245 | { |
screamer | 0:7a64fbb4069d | 246 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 247 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 248 | } |
screamer | 0:7a64fbb4069d | 249 | *msg_ptr = length; |
screamer | 0:7a64fbb4069d | 250 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 251 | } |
screamer | 0:7a64fbb4069d | 252 | else |
screamer | 0:7a64fbb4069d | 253 | { |
screamer | 0:7a64fbb4069d | 254 | u8_t i; |
screamer | 0:7a64fbb4069d | 255 | |
screamer | 0:7a64fbb4069d | 256 | /* length >= 0x100 && length <= 0xFFFF */ |
screamer | 0:7a64fbb4069d | 257 | *msg_ptr = 0x82; |
screamer | 0:7a64fbb4069d | 258 | i = 2; |
screamer | 0:7a64fbb4069d | 259 | while (i > 0) |
screamer | 0:7a64fbb4069d | 260 | { |
screamer | 0:7a64fbb4069d | 261 | i--; |
screamer | 0:7a64fbb4069d | 262 | ofs += 1; |
screamer | 0:7a64fbb4069d | 263 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 264 | { |
screamer | 0:7a64fbb4069d | 265 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 266 | p = p->next; |
screamer | 0:7a64fbb4069d | 267 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 268 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 269 | plen += p->len; |
screamer | 0:7a64fbb4069d | 270 | } |
screamer | 0:7a64fbb4069d | 271 | else |
screamer | 0:7a64fbb4069d | 272 | { |
screamer | 0:7a64fbb4069d | 273 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 274 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 275 | } |
screamer | 0:7a64fbb4069d | 276 | if (i == 0) |
screamer | 0:7a64fbb4069d | 277 | { |
screamer | 0:7a64fbb4069d | 278 | /* least significant length octet */ |
screamer | 0:7a64fbb4069d | 279 | *msg_ptr = length; |
screamer | 0:7a64fbb4069d | 280 | } |
screamer | 0:7a64fbb4069d | 281 | else |
screamer | 0:7a64fbb4069d | 282 | { |
screamer | 0:7a64fbb4069d | 283 | /* most significant length octet */ |
screamer | 0:7a64fbb4069d | 284 | *msg_ptr = length >> 8; |
screamer | 0:7a64fbb4069d | 285 | } |
screamer | 0:7a64fbb4069d | 286 | } |
screamer | 0:7a64fbb4069d | 287 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 288 | } |
screamer | 0:7a64fbb4069d | 289 | } |
screamer | 0:7a64fbb4069d | 290 | p = p->next; |
screamer | 0:7a64fbb4069d | 291 | } |
screamer | 0:7a64fbb4069d | 292 | /* p == NULL, ofs >= plen */ |
screamer | 0:7a64fbb4069d | 293 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 294 | } |
screamer | 0:7a64fbb4069d | 295 | |
screamer | 0:7a64fbb4069d | 296 | /** |
screamer | 0:7a64fbb4069d | 297 | * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg. |
screamer | 0:7a64fbb4069d | 298 | * |
screamer | 0:7a64fbb4069d | 299 | * @param p points to output pbuf to encode value into |
screamer | 0:7a64fbb4069d | 300 | * @param ofs points to the offset within the pbuf chain |
screamer | 0:7a64fbb4069d | 301 | * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt()) |
screamer | 0:7a64fbb4069d | 302 | * @param value is the host order u32_t value to be encoded |
screamer | 0:7a64fbb4069d | 303 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
screamer | 0:7a64fbb4069d | 304 | * |
screamer | 0:7a64fbb4069d | 305 | * @see snmp_asn1_enc_u32t_cnt() |
screamer | 0:7a64fbb4069d | 306 | */ |
screamer | 0:7a64fbb4069d | 307 | err_t |
screamer | 0:7a64fbb4069d | 308 | snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, u32_t value) |
screamer | 0:7a64fbb4069d | 309 | { |
screamer | 0:7a64fbb4069d | 310 | u16_t plen, base; |
screamer | 0:7a64fbb4069d | 311 | u8_t *msg_ptr; |
screamer | 0:7a64fbb4069d | 312 | |
screamer | 0:7a64fbb4069d | 313 | plen = 0; |
screamer | 0:7a64fbb4069d | 314 | while (p != NULL) |
screamer | 0:7a64fbb4069d | 315 | { |
screamer | 0:7a64fbb4069d | 316 | base = plen; |
screamer | 0:7a64fbb4069d | 317 | plen += p->len; |
screamer | 0:7a64fbb4069d | 318 | if (ofs < plen) |
screamer | 0:7a64fbb4069d | 319 | { |
screamer | 0:7a64fbb4069d | 320 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 321 | msg_ptr += ofs - base; |
screamer | 0:7a64fbb4069d | 322 | |
screamer | 0:7a64fbb4069d | 323 | if (octets_needed == 5) |
screamer | 0:7a64fbb4069d | 324 | { |
screamer | 0:7a64fbb4069d | 325 | /* not enough bits in 'value' add leading 0x00 */ |
screamer | 0:7a64fbb4069d | 326 | octets_needed--; |
screamer | 0:7a64fbb4069d | 327 | *msg_ptr = 0x00; |
screamer | 0:7a64fbb4069d | 328 | ofs += 1; |
screamer | 0:7a64fbb4069d | 329 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 330 | { |
screamer | 0:7a64fbb4069d | 331 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 332 | p = p->next; |
screamer | 0:7a64fbb4069d | 333 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 334 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 335 | plen += p->len; |
screamer | 0:7a64fbb4069d | 336 | } |
screamer | 0:7a64fbb4069d | 337 | else |
screamer | 0:7a64fbb4069d | 338 | { |
screamer | 0:7a64fbb4069d | 339 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 340 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 341 | } |
screamer | 0:7a64fbb4069d | 342 | } |
screamer | 0:7a64fbb4069d | 343 | while (octets_needed > 1) |
screamer | 0:7a64fbb4069d | 344 | { |
screamer | 0:7a64fbb4069d | 345 | octets_needed--; |
screamer | 0:7a64fbb4069d | 346 | *msg_ptr = value >> (octets_needed << 3); |
screamer | 0:7a64fbb4069d | 347 | ofs += 1; |
screamer | 0:7a64fbb4069d | 348 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 349 | { |
screamer | 0:7a64fbb4069d | 350 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 351 | p = p->next; |
screamer | 0:7a64fbb4069d | 352 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 353 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 354 | plen += p->len; |
screamer | 0:7a64fbb4069d | 355 | } |
screamer | 0:7a64fbb4069d | 356 | else |
screamer | 0:7a64fbb4069d | 357 | { |
screamer | 0:7a64fbb4069d | 358 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 359 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 360 | } |
screamer | 0:7a64fbb4069d | 361 | } |
screamer | 0:7a64fbb4069d | 362 | /* (only) one least significant octet */ |
screamer | 0:7a64fbb4069d | 363 | *msg_ptr = value; |
screamer | 0:7a64fbb4069d | 364 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 365 | } |
screamer | 0:7a64fbb4069d | 366 | p = p->next; |
screamer | 0:7a64fbb4069d | 367 | } |
screamer | 0:7a64fbb4069d | 368 | /* p == NULL, ofs >= plen */ |
screamer | 0:7a64fbb4069d | 369 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 370 | } |
screamer | 0:7a64fbb4069d | 371 | |
screamer | 0:7a64fbb4069d | 372 | /** |
screamer | 0:7a64fbb4069d | 373 | * Encodes s32_t integer into a pbuf chained ASN1 msg. |
screamer | 0:7a64fbb4069d | 374 | * |
screamer | 0:7a64fbb4069d | 375 | * @param p points to output pbuf to encode value into |
screamer | 0:7a64fbb4069d | 376 | * @param ofs points to the offset within the pbuf chain |
screamer | 0:7a64fbb4069d | 377 | * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt()) |
screamer | 0:7a64fbb4069d | 378 | * @param value is the host order s32_t value to be encoded |
screamer | 0:7a64fbb4069d | 379 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
screamer | 0:7a64fbb4069d | 380 | * |
screamer | 0:7a64fbb4069d | 381 | * @see snmp_asn1_enc_s32t_cnt() |
screamer | 0:7a64fbb4069d | 382 | */ |
screamer | 0:7a64fbb4069d | 383 | err_t |
screamer | 0:7a64fbb4069d | 384 | snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, s32_t value) |
screamer | 0:7a64fbb4069d | 385 | { |
screamer | 0:7a64fbb4069d | 386 | u16_t plen, base; |
screamer | 0:7a64fbb4069d | 387 | u8_t *msg_ptr; |
screamer | 0:7a64fbb4069d | 388 | |
screamer | 0:7a64fbb4069d | 389 | plen = 0; |
screamer | 0:7a64fbb4069d | 390 | while (p != NULL) |
screamer | 0:7a64fbb4069d | 391 | { |
screamer | 0:7a64fbb4069d | 392 | base = plen; |
screamer | 0:7a64fbb4069d | 393 | plen += p->len; |
screamer | 0:7a64fbb4069d | 394 | if (ofs < plen) |
screamer | 0:7a64fbb4069d | 395 | { |
screamer | 0:7a64fbb4069d | 396 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 397 | msg_ptr += ofs - base; |
screamer | 0:7a64fbb4069d | 398 | |
screamer | 0:7a64fbb4069d | 399 | while (octets_needed > 1) |
screamer | 0:7a64fbb4069d | 400 | { |
screamer | 0:7a64fbb4069d | 401 | octets_needed--; |
screamer | 0:7a64fbb4069d | 402 | *msg_ptr = value >> (octets_needed << 3); |
screamer | 0:7a64fbb4069d | 403 | ofs += 1; |
screamer | 0:7a64fbb4069d | 404 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 405 | { |
screamer | 0:7a64fbb4069d | 406 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 407 | p = p->next; |
screamer | 0:7a64fbb4069d | 408 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 409 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 410 | plen += p->len; |
screamer | 0:7a64fbb4069d | 411 | } |
screamer | 0:7a64fbb4069d | 412 | else |
screamer | 0:7a64fbb4069d | 413 | { |
screamer | 0:7a64fbb4069d | 414 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 415 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 416 | } |
screamer | 0:7a64fbb4069d | 417 | } |
screamer | 0:7a64fbb4069d | 418 | /* (only) one least significant octet */ |
screamer | 0:7a64fbb4069d | 419 | *msg_ptr = value; |
screamer | 0:7a64fbb4069d | 420 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 421 | } |
screamer | 0:7a64fbb4069d | 422 | p = p->next; |
screamer | 0:7a64fbb4069d | 423 | } |
screamer | 0:7a64fbb4069d | 424 | /* p == NULL, ofs >= plen */ |
screamer | 0:7a64fbb4069d | 425 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 426 | } |
screamer | 0:7a64fbb4069d | 427 | |
screamer | 0:7a64fbb4069d | 428 | /** |
screamer | 0:7a64fbb4069d | 429 | * Encodes object identifier into a pbuf chained ASN1 msg. |
screamer | 0:7a64fbb4069d | 430 | * |
screamer | 0:7a64fbb4069d | 431 | * @param p points to output pbuf to encode oid into |
screamer | 0:7a64fbb4069d | 432 | * @param ofs points to the offset within the pbuf chain |
screamer | 0:7a64fbb4069d | 433 | * @param ident_len object identifier array length |
screamer | 0:7a64fbb4069d | 434 | * @param ident points to object identifier array |
screamer | 0:7a64fbb4069d | 435 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
screamer | 0:7a64fbb4069d | 436 | */ |
screamer | 0:7a64fbb4069d | 437 | err_t |
screamer | 0:7a64fbb4069d | 438 | snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident) |
screamer | 0:7a64fbb4069d | 439 | { |
screamer | 0:7a64fbb4069d | 440 | u16_t plen, base; |
screamer | 0:7a64fbb4069d | 441 | u8_t *msg_ptr; |
screamer | 0:7a64fbb4069d | 442 | |
screamer | 0:7a64fbb4069d | 443 | plen = 0; |
screamer | 0:7a64fbb4069d | 444 | while (p != NULL) |
screamer | 0:7a64fbb4069d | 445 | { |
screamer | 0:7a64fbb4069d | 446 | base = plen; |
screamer | 0:7a64fbb4069d | 447 | plen += p->len; |
screamer | 0:7a64fbb4069d | 448 | if (ofs < plen) |
screamer | 0:7a64fbb4069d | 449 | { |
screamer | 0:7a64fbb4069d | 450 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 451 | msg_ptr += ofs - base; |
screamer | 0:7a64fbb4069d | 452 | |
screamer | 0:7a64fbb4069d | 453 | if (ident_len > 1) |
screamer | 0:7a64fbb4069d | 454 | { |
screamer | 0:7a64fbb4069d | 455 | if ((ident[0] == 1) && (ident[1] == 3)) |
screamer | 0:7a64fbb4069d | 456 | { |
screamer | 0:7a64fbb4069d | 457 | /* compressed (most common) prefix .iso.org */ |
screamer | 0:7a64fbb4069d | 458 | *msg_ptr = 0x2b; |
screamer | 0:7a64fbb4069d | 459 | } |
screamer | 0:7a64fbb4069d | 460 | else |
screamer | 0:7a64fbb4069d | 461 | { |
screamer | 0:7a64fbb4069d | 462 | /* calculate prefix */ |
screamer | 0:7a64fbb4069d | 463 | *msg_ptr = (ident[0] * 40) + ident[1]; |
screamer | 0:7a64fbb4069d | 464 | } |
screamer | 0:7a64fbb4069d | 465 | ofs += 1; |
screamer | 0:7a64fbb4069d | 466 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 467 | { |
screamer | 0:7a64fbb4069d | 468 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 469 | p = p->next; |
screamer | 0:7a64fbb4069d | 470 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 471 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 472 | plen += p->len; |
screamer | 0:7a64fbb4069d | 473 | } |
screamer | 0:7a64fbb4069d | 474 | else |
screamer | 0:7a64fbb4069d | 475 | { |
screamer | 0:7a64fbb4069d | 476 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 477 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 478 | } |
screamer | 0:7a64fbb4069d | 479 | ident_len -= 2; |
screamer | 0:7a64fbb4069d | 480 | ident += 2; |
screamer | 0:7a64fbb4069d | 481 | } |
screamer | 0:7a64fbb4069d | 482 | else |
screamer | 0:7a64fbb4069d | 483 | { |
screamer | 0:7a64fbb4069d | 484 | /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */ |
screamer | 0:7a64fbb4069d | 485 | /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */ |
screamer | 0:7a64fbb4069d | 486 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 487 | } |
screamer | 0:7a64fbb4069d | 488 | while (ident_len > 0) |
screamer | 0:7a64fbb4069d | 489 | { |
screamer | 0:7a64fbb4069d | 490 | s32_t sub_id; |
screamer | 0:7a64fbb4069d | 491 | u8_t shift, tail; |
screamer | 0:7a64fbb4069d | 492 | |
screamer | 0:7a64fbb4069d | 493 | ident_len--; |
screamer | 0:7a64fbb4069d | 494 | sub_id = *ident; |
screamer | 0:7a64fbb4069d | 495 | tail = 0; |
screamer | 0:7a64fbb4069d | 496 | shift = 28; |
screamer | 0:7a64fbb4069d | 497 | while(shift > 0) |
screamer | 0:7a64fbb4069d | 498 | { |
screamer | 0:7a64fbb4069d | 499 | u8_t code; |
screamer | 0:7a64fbb4069d | 500 | |
screamer | 0:7a64fbb4069d | 501 | code = sub_id >> shift; |
screamer | 0:7a64fbb4069d | 502 | if ((code != 0) || (tail != 0)) |
screamer | 0:7a64fbb4069d | 503 | { |
screamer | 0:7a64fbb4069d | 504 | tail = 1; |
screamer | 0:7a64fbb4069d | 505 | *msg_ptr = code | 0x80; |
screamer | 0:7a64fbb4069d | 506 | ofs += 1; |
screamer | 0:7a64fbb4069d | 507 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 508 | { |
screamer | 0:7a64fbb4069d | 509 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 510 | p = p->next; |
screamer | 0:7a64fbb4069d | 511 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 512 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 513 | plen += p->len; |
screamer | 0:7a64fbb4069d | 514 | } |
screamer | 0:7a64fbb4069d | 515 | else |
screamer | 0:7a64fbb4069d | 516 | { |
screamer | 0:7a64fbb4069d | 517 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 518 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 519 | } |
screamer | 0:7a64fbb4069d | 520 | } |
screamer | 0:7a64fbb4069d | 521 | shift -= 7; |
screamer | 0:7a64fbb4069d | 522 | } |
screamer | 0:7a64fbb4069d | 523 | *msg_ptr = (u8_t)sub_id & 0x7F; |
screamer | 0:7a64fbb4069d | 524 | if (ident_len > 0) |
screamer | 0:7a64fbb4069d | 525 | { |
screamer | 0:7a64fbb4069d | 526 | ofs += 1; |
screamer | 0:7a64fbb4069d | 527 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 528 | { |
screamer | 0:7a64fbb4069d | 529 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 530 | p = p->next; |
screamer | 0:7a64fbb4069d | 531 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 532 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 533 | plen += p->len; |
screamer | 0:7a64fbb4069d | 534 | } |
screamer | 0:7a64fbb4069d | 535 | else |
screamer | 0:7a64fbb4069d | 536 | { |
screamer | 0:7a64fbb4069d | 537 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 538 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 539 | } |
screamer | 0:7a64fbb4069d | 540 | } |
screamer | 0:7a64fbb4069d | 541 | /* proceed to next sub-identifier */ |
screamer | 0:7a64fbb4069d | 542 | ident++; |
screamer | 0:7a64fbb4069d | 543 | } |
screamer | 0:7a64fbb4069d | 544 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 545 | } |
screamer | 0:7a64fbb4069d | 546 | p = p->next; |
screamer | 0:7a64fbb4069d | 547 | } |
screamer | 0:7a64fbb4069d | 548 | /* p == NULL, ofs >= plen */ |
screamer | 0:7a64fbb4069d | 549 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 550 | } |
screamer | 0:7a64fbb4069d | 551 | |
screamer | 0:7a64fbb4069d | 552 | /** |
screamer | 0:7a64fbb4069d | 553 | * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg. |
screamer | 0:7a64fbb4069d | 554 | * |
screamer | 0:7a64fbb4069d | 555 | * @param p points to output pbuf to encode raw data into |
screamer | 0:7a64fbb4069d | 556 | * @param ofs points to the offset within the pbuf chain |
screamer | 0:7a64fbb4069d | 557 | * @param raw_len raw data length |
screamer | 0:7a64fbb4069d | 558 | * @param raw points raw data |
screamer | 0:7a64fbb4069d | 559 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
screamer | 0:7a64fbb4069d | 560 | */ |
screamer | 0:7a64fbb4069d | 561 | err_t |
screamer | 0:7a64fbb4069d | 562 | snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u8_t raw_len, u8_t *raw) |
screamer | 0:7a64fbb4069d | 563 | { |
screamer | 0:7a64fbb4069d | 564 | u16_t plen, base; |
screamer | 0:7a64fbb4069d | 565 | u8_t *msg_ptr; |
screamer | 0:7a64fbb4069d | 566 | |
screamer | 0:7a64fbb4069d | 567 | plen = 0; |
screamer | 0:7a64fbb4069d | 568 | while (p != NULL) |
screamer | 0:7a64fbb4069d | 569 | { |
screamer | 0:7a64fbb4069d | 570 | base = plen; |
screamer | 0:7a64fbb4069d | 571 | plen += p->len; |
screamer | 0:7a64fbb4069d | 572 | if (ofs < plen) |
screamer | 0:7a64fbb4069d | 573 | { |
screamer | 0:7a64fbb4069d | 574 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 575 | msg_ptr += ofs - base; |
screamer | 0:7a64fbb4069d | 576 | |
screamer | 0:7a64fbb4069d | 577 | while (raw_len > 1) |
screamer | 0:7a64fbb4069d | 578 | { |
screamer | 0:7a64fbb4069d | 579 | /* copy raw_len - 1 octets */ |
screamer | 0:7a64fbb4069d | 580 | raw_len--; |
screamer | 0:7a64fbb4069d | 581 | *msg_ptr = *raw; |
screamer | 0:7a64fbb4069d | 582 | raw++; |
screamer | 0:7a64fbb4069d | 583 | ofs += 1; |
screamer | 0:7a64fbb4069d | 584 | if (ofs >= plen) |
screamer | 0:7a64fbb4069d | 585 | { |
screamer | 0:7a64fbb4069d | 586 | /* next octet in next pbuf */ |
screamer | 0:7a64fbb4069d | 587 | p = p->next; |
screamer | 0:7a64fbb4069d | 588 | if (p == NULL) { return ERR_ARG; } |
screamer | 0:7a64fbb4069d | 589 | msg_ptr = p->payload; |
screamer | 0:7a64fbb4069d | 590 | plen += p->len; |
screamer | 0:7a64fbb4069d | 591 | } |
screamer | 0:7a64fbb4069d | 592 | else |
screamer | 0:7a64fbb4069d | 593 | { |
screamer | 0:7a64fbb4069d | 594 | /* next octet in same pbuf */ |
screamer | 0:7a64fbb4069d | 595 | msg_ptr++; |
screamer | 0:7a64fbb4069d | 596 | } |
screamer | 0:7a64fbb4069d | 597 | } |
screamer | 0:7a64fbb4069d | 598 | if (raw_len > 0) |
screamer | 0:7a64fbb4069d | 599 | { |
screamer | 0:7a64fbb4069d | 600 | /* copy last or single octet */ |
screamer | 0:7a64fbb4069d | 601 | *msg_ptr = *raw; |
screamer | 0:7a64fbb4069d | 602 | } |
screamer | 0:7a64fbb4069d | 603 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 604 | } |
screamer | 0:7a64fbb4069d | 605 | p = p->next; |
screamer | 0:7a64fbb4069d | 606 | } |
screamer | 0:7a64fbb4069d | 607 | /* p == NULL, ofs >= plen */ |
screamer | 0:7a64fbb4069d | 608 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 609 | } |
screamer | 0:7a64fbb4069d | 610 | |
screamer | 0:7a64fbb4069d | 611 | #endif /* LWIP_SNMP */ |