Integrating the ublox LISA C200 modem
Fork of SprintUSBModemHTTPClientTest by
SprintUSBModem/lwip/core/snmp/asn1_enc.c@5:3f93dd1d4cb3, 2013-09-26 (annotated)
- Committer:
- sam_grove
- Date:
- Thu Sep 26 00:44:20 2013 -0500
- Revision:
- 5:3f93dd1d4cb3
Exported program and replaced contents of the repo with the source
to build and debug using keil mdk. Libs NOT upto date are lwip, lwip-sys
and socket. these have newer versions under mbed_official but were starting
from a know working point
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
sam_grove | 5:3f93dd1d4cb3 | 1 | /** |
sam_grove | 5:3f93dd1d4cb3 | 2 | * @file |
sam_grove | 5:3f93dd1d4cb3 | 3 | * Abstract Syntax Notation One (ISO 8824, 8825) encoding |
sam_grove | 5:3f93dd1d4cb3 | 4 | * |
sam_grove | 5:3f93dd1d4cb3 | 5 | * @todo not optimised (yet), favor correctness over speed, favor speed over size |
sam_grove | 5:3f93dd1d4cb3 | 6 | */ |
sam_grove | 5:3f93dd1d4cb3 | 7 | |
sam_grove | 5:3f93dd1d4cb3 | 8 | /* |
sam_grove | 5:3f93dd1d4cb3 | 9 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands. |
sam_grove | 5:3f93dd1d4cb3 | 10 | * All rights reserved. |
sam_grove | 5:3f93dd1d4cb3 | 11 | * |
sam_grove | 5:3f93dd1d4cb3 | 12 | * Redistribution and use in source and binary forms, with or without modification, |
sam_grove | 5:3f93dd1d4cb3 | 13 | * are permitted provided that the following conditions are met: |
sam_grove | 5:3f93dd1d4cb3 | 14 | * |
sam_grove | 5:3f93dd1d4cb3 | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
sam_grove | 5:3f93dd1d4cb3 | 16 | * this list of conditions and the following disclaimer. |
sam_grove | 5:3f93dd1d4cb3 | 17 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
sam_grove | 5:3f93dd1d4cb3 | 18 | * this list of conditions and the following disclaimer in the documentation |
sam_grove | 5:3f93dd1d4cb3 | 19 | * and/or other materials provided with the distribution. |
sam_grove | 5:3f93dd1d4cb3 | 20 | * 3. The name of the author may not be used to endorse or promote products |
sam_grove | 5:3f93dd1d4cb3 | 21 | * derived from this software without specific prior written permission. |
sam_grove | 5:3f93dd1d4cb3 | 22 | * |
sam_grove | 5:3f93dd1d4cb3 | 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
sam_grove | 5:3f93dd1d4cb3 | 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
sam_grove | 5:3f93dd1d4cb3 | 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
sam_grove | 5:3f93dd1d4cb3 | 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
sam_grove | 5:3f93dd1d4cb3 | 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
sam_grove | 5:3f93dd1d4cb3 | 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
sam_grove | 5:3f93dd1d4cb3 | 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
sam_grove | 5:3f93dd1d4cb3 | 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
sam_grove | 5:3f93dd1d4cb3 | 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
sam_grove | 5:3f93dd1d4cb3 | 32 | * OF SUCH DAMAGE. |
sam_grove | 5:3f93dd1d4cb3 | 33 | * |
sam_grove | 5:3f93dd1d4cb3 | 34 | * Author: Christiaan Simons <christiaan.simons@axon.tv> |
sam_grove | 5:3f93dd1d4cb3 | 35 | */ |
sam_grove | 5:3f93dd1d4cb3 | 36 | |
sam_grove | 5:3f93dd1d4cb3 | 37 | #include "lwip/opt.h" |
sam_grove | 5:3f93dd1d4cb3 | 38 | |
sam_grove | 5:3f93dd1d4cb3 | 39 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */ |
sam_grove | 5:3f93dd1d4cb3 | 40 | |
sam_grove | 5:3f93dd1d4cb3 | 41 | #include "lwip/snmp_asn1.h" |
sam_grove | 5:3f93dd1d4cb3 | 42 | |
sam_grove | 5:3f93dd1d4cb3 | 43 | /** |
sam_grove | 5:3f93dd1d4cb3 | 44 | * Returns octet count for length. |
sam_grove | 5:3f93dd1d4cb3 | 45 | * |
sam_grove | 5:3f93dd1d4cb3 | 46 | * @param length |
sam_grove | 5:3f93dd1d4cb3 | 47 | * @param octets_needed points to the return value |
sam_grove | 5:3f93dd1d4cb3 | 48 | */ |
sam_grove | 5:3f93dd1d4cb3 | 49 | void |
sam_grove | 5:3f93dd1d4cb3 | 50 | snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed) |
sam_grove | 5:3f93dd1d4cb3 | 51 | { |
sam_grove | 5:3f93dd1d4cb3 | 52 | if (length < 0x80U) |
sam_grove | 5:3f93dd1d4cb3 | 53 | { |
sam_grove | 5:3f93dd1d4cb3 | 54 | *octets_needed = 1; |
sam_grove | 5:3f93dd1d4cb3 | 55 | } |
sam_grove | 5:3f93dd1d4cb3 | 56 | else if (length < 0x100U) |
sam_grove | 5:3f93dd1d4cb3 | 57 | { |
sam_grove | 5:3f93dd1d4cb3 | 58 | *octets_needed = 2; |
sam_grove | 5:3f93dd1d4cb3 | 59 | } |
sam_grove | 5:3f93dd1d4cb3 | 60 | else |
sam_grove | 5:3f93dd1d4cb3 | 61 | { |
sam_grove | 5:3f93dd1d4cb3 | 62 | *octets_needed = 3; |
sam_grove | 5:3f93dd1d4cb3 | 63 | } |
sam_grove | 5:3f93dd1d4cb3 | 64 | } |
sam_grove | 5:3f93dd1d4cb3 | 65 | |
sam_grove | 5:3f93dd1d4cb3 | 66 | /** |
sam_grove | 5:3f93dd1d4cb3 | 67 | * Returns octet count for an u32_t. |
sam_grove | 5:3f93dd1d4cb3 | 68 | * |
sam_grove | 5:3f93dd1d4cb3 | 69 | * @param value |
sam_grove | 5:3f93dd1d4cb3 | 70 | * @param octets_needed points to the return value |
sam_grove | 5:3f93dd1d4cb3 | 71 | * |
sam_grove | 5:3f93dd1d4cb3 | 72 | * @note ASN coded integers are _always_ signed. E.g. +0xFFFF is coded |
sam_grove | 5:3f93dd1d4cb3 | 73 | * as 0x00,0xFF,0xFF. Note the leading sign octet. A positive value |
sam_grove | 5:3f93dd1d4cb3 | 74 | * of 0xFFFFFFFF is preceded with 0x00 and the length is 5 octets!! |
sam_grove | 5:3f93dd1d4cb3 | 75 | */ |
sam_grove | 5:3f93dd1d4cb3 | 76 | void |
sam_grove | 5:3f93dd1d4cb3 | 77 | snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed) |
sam_grove | 5:3f93dd1d4cb3 | 78 | { |
sam_grove | 5:3f93dd1d4cb3 | 79 | if (value < 0x80UL) |
sam_grove | 5:3f93dd1d4cb3 | 80 | { |
sam_grove | 5:3f93dd1d4cb3 | 81 | *octets_needed = 1; |
sam_grove | 5:3f93dd1d4cb3 | 82 | } |
sam_grove | 5:3f93dd1d4cb3 | 83 | else if (value < 0x8000UL) |
sam_grove | 5:3f93dd1d4cb3 | 84 | { |
sam_grove | 5:3f93dd1d4cb3 | 85 | *octets_needed = 2; |
sam_grove | 5:3f93dd1d4cb3 | 86 | } |
sam_grove | 5:3f93dd1d4cb3 | 87 | else if (value < 0x800000UL) |
sam_grove | 5:3f93dd1d4cb3 | 88 | { |
sam_grove | 5:3f93dd1d4cb3 | 89 | *octets_needed = 3; |
sam_grove | 5:3f93dd1d4cb3 | 90 | } |
sam_grove | 5:3f93dd1d4cb3 | 91 | else if (value < 0x80000000UL) |
sam_grove | 5:3f93dd1d4cb3 | 92 | { |
sam_grove | 5:3f93dd1d4cb3 | 93 | *octets_needed = 4; |
sam_grove | 5:3f93dd1d4cb3 | 94 | } |
sam_grove | 5:3f93dd1d4cb3 | 95 | else |
sam_grove | 5:3f93dd1d4cb3 | 96 | { |
sam_grove | 5:3f93dd1d4cb3 | 97 | *octets_needed = 5; |
sam_grove | 5:3f93dd1d4cb3 | 98 | } |
sam_grove | 5:3f93dd1d4cb3 | 99 | } |
sam_grove | 5:3f93dd1d4cb3 | 100 | |
sam_grove | 5:3f93dd1d4cb3 | 101 | /** |
sam_grove | 5:3f93dd1d4cb3 | 102 | * Returns octet count for an s32_t. |
sam_grove | 5:3f93dd1d4cb3 | 103 | * |
sam_grove | 5:3f93dd1d4cb3 | 104 | * @param value |
sam_grove | 5:3f93dd1d4cb3 | 105 | * @param octets_needed points to the return value |
sam_grove | 5:3f93dd1d4cb3 | 106 | * |
sam_grove | 5:3f93dd1d4cb3 | 107 | * @note ASN coded integers are _always_ signed. |
sam_grove | 5:3f93dd1d4cb3 | 108 | */ |
sam_grove | 5:3f93dd1d4cb3 | 109 | void |
sam_grove | 5:3f93dd1d4cb3 | 110 | snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed) |
sam_grove | 5:3f93dd1d4cb3 | 111 | { |
sam_grove | 5:3f93dd1d4cb3 | 112 | if (value < 0) |
sam_grove | 5:3f93dd1d4cb3 | 113 | { |
sam_grove | 5:3f93dd1d4cb3 | 114 | value = ~value; |
sam_grove | 5:3f93dd1d4cb3 | 115 | } |
sam_grove | 5:3f93dd1d4cb3 | 116 | if (value < 0x80L) |
sam_grove | 5:3f93dd1d4cb3 | 117 | { |
sam_grove | 5:3f93dd1d4cb3 | 118 | *octets_needed = 1; |
sam_grove | 5:3f93dd1d4cb3 | 119 | } |
sam_grove | 5:3f93dd1d4cb3 | 120 | else if (value < 0x8000L) |
sam_grove | 5:3f93dd1d4cb3 | 121 | { |
sam_grove | 5:3f93dd1d4cb3 | 122 | *octets_needed = 2; |
sam_grove | 5:3f93dd1d4cb3 | 123 | } |
sam_grove | 5:3f93dd1d4cb3 | 124 | else if (value < 0x800000L) |
sam_grove | 5:3f93dd1d4cb3 | 125 | { |
sam_grove | 5:3f93dd1d4cb3 | 126 | *octets_needed = 3; |
sam_grove | 5:3f93dd1d4cb3 | 127 | } |
sam_grove | 5:3f93dd1d4cb3 | 128 | else |
sam_grove | 5:3f93dd1d4cb3 | 129 | { |
sam_grove | 5:3f93dd1d4cb3 | 130 | *octets_needed = 4; |
sam_grove | 5:3f93dd1d4cb3 | 131 | } |
sam_grove | 5:3f93dd1d4cb3 | 132 | } |
sam_grove | 5:3f93dd1d4cb3 | 133 | |
sam_grove | 5:3f93dd1d4cb3 | 134 | /** |
sam_grove | 5:3f93dd1d4cb3 | 135 | * Returns octet count for an object identifier. |
sam_grove | 5:3f93dd1d4cb3 | 136 | * |
sam_grove | 5:3f93dd1d4cb3 | 137 | * @param ident_len object identifier array length |
sam_grove | 5:3f93dd1d4cb3 | 138 | * @param ident points to object identifier array |
sam_grove | 5:3f93dd1d4cb3 | 139 | * @param octets_needed points to the return value |
sam_grove | 5:3f93dd1d4cb3 | 140 | */ |
sam_grove | 5:3f93dd1d4cb3 | 141 | void |
sam_grove | 5:3f93dd1d4cb3 | 142 | snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed) |
sam_grove | 5:3f93dd1d4cb3 | 143 | { |
sam_grove | 5:3f93dd1d4cb3 | 144 | s32_t sub_id; |
sam_grove | 5:3f93dd1d4cb3 | 145 | u8_t cnt; |
sam_grove | 5:3f93dd1d4cb3 | 146 | |
sam_grove | 5:3f93dd1d4cb3 | 147 | cnt = 0; |
sam_grove | 5:3f93dd1d4cb3 | 148 | if (ident_len > 1) |
sam_grove | 5:3f93dd1d4cb3 | 149 | { |
sam_grove | 5:3f93dd1d4cb3 | 150 | /* compressed prefix in one octet */ |
sam_grove | 5:3f93dd1d4cb3 | 151 | cnt++; |
sam_grove | 5:3f93dd1d4cb3 | 152 | ident_len -= 2; |
sam_grove | 5:3f93dd1d4cb3 | 153 | ident += 2; |
sam_grove | 5:3f93dd1d4cb3 | 154 | } |
sam_grove | 5:3f93dd1d4cb3 | 155 | while(ident_len > 0) |
sam_grove | 5:3f93dd1d4cb3 | 156 | { |
sam_grove | 5:3f93dd1d4cb3 | 157 | ident_len--; |
sam_grove | 5:3f93dd1d4cb3 | 158 | sub_id = *ident; |
sam_grove | 5:3f93dd1d4cb3 | 159 | |
sam_grove | 5:3f93dd1d4cb3 | 160 | sub_id >>= 7; |
sam_grove | 5:3f93dd1d4cb3 | 161 | cnt++; |
sam_grove | 5:3f93dd1d4cb3 | 162 | while(sub_id > 0) |
sam_grove | 5:3f93dd1d4cb3 | 163 | { |
sam_grove | 5:3f93dd1d4cb3 | 164 | sub_id >>= 7; |
sam_grove | 5:3f93dd1d4cb3 | 165 | cnt++; |
sam_grove | 5:3f93dd1d4cb3 | 166 | } |
sam_grove | 5:3f93dd1d4cb3 | 167 | ident++; |
sam_grove | 5:3f93dd1d4cb3 | 168 | } |
sam_grove | 5:3f93dd1d4cb3 | 169 | *octets_needed = cnt; |
sam_grove | 5:3f93dd1d4cb3 | 170 | } |
sam_grove | 5:3f93dd1d4cb3 | 171 | |
sam_grove | 5:3f93dd1d4cb3 | 172 | /** |
sam_grove | 5:3f93dd1d4cb3 | 173 | * Encodes ASN type field into a pbuf chained ASN1 msg. |
sam_grove | 5:3f93dd1d4cb3 | 174 | * |
sam_grove | 5:3f93dd1d4cb3 | 175 | * @param p points to output pbuf to encode value into |
sam_grove | 5:3f93dd1d4cb3 | 176 | * @param ofs points to the offset within the pbuf chain |
sam_grove | 5:3f93dd1d4cb3 | 177 | * @param type input ASN1 type |
sam_grove | 5:3f93dd1d4cb3 | 178 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
sam_grove | 5:3f93dd1d4cb3 | 179 | */ |
sam_grove | 5:3f93dd1d4cb3 | 180 | err_t |
sam_grove | 5:3f93dd1d4cb3 | 181 | snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type) |
sam_grove | 5:3f93dd1d4cb3 | 182 | { |
sam_grove | 5:3f93dd1d4cb3 | 183 | u16_t plen, base; |
sam_grove | 5:3f93dd1d4cb3 | 184 | u8_t *msg_ptr; |
sam_grove | 5:3f93dd1d4cb3 | 185 | |
sam_grove | 5:3f93dd1d4cb3 | 186 | plen = 0; |
sam_grove | 5:3f93dd1d4cb3 | 187 | while (p != NULL) |
sam_grove | 5:3f93dd1d4cb3 | 188 | { |
sam_grove | 5:3f93dd1d4cb3 | 189 | base = plen; |
sam_grove | 5:3f93dd1d4cb3 | 190 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 191 | if (ofs < plen) |
sam_grove | 5:3f93dd1d4cb3 | 192 | { |
sam_grove | 5:3f93dd1d4cb3 | 193 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 194 | msg_ptr += ofs - base; |
sam_grove | 5:3f93dd1d4cb3 | 195 | *msg_ptr = type; |
sam_grove | 5:3f93dd1d4cb3 | 196 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 197 | } |
sam_grove | 5:3f93dd1d4cb3 | 198 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 199 | } |
sam_grove | 5:3f93dd1d4cb3 | 200 | /* p == NULL, ofs >= plen */ |
sam_grove | 5:3f93dd1d4cb3 | 201 | return ERR_ARG; |
sam_grove | 5:3f93dd1d4cb3 | 202 | } |
sam_grove | 5:3f93dd1d4cb3 | 203 | |
sam_grove | 5:3f93dd1d4cb3 | 204 | /** |
sam_grove | 5:3f93dd1d4cb3 | 205 | * Encodes host order length field into a pbuf chained ASN1 msg. |
sam_grove | 5:3f93dd1d4cb3 | 206 | * |
sam_grove | 5:3f93dd1d4cb3 | 207 | * @param p points to output pbuf to encode length into |
sam_grove | 5:3f93dd1d4cb3 | 208 | * @param ofs points to the offset within the pbuf chain |
sam_grove | 5:3f93dd1d4cb3 | 209 | * @param length is the host order length to be encoded |
sam_grove | 5:3f93dd1d4cb3 | 210 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
sam_grove | 5:3f93dd1d4cb3 | 211 | */ |
sam_grove | 5:3f93dd1d4cb3 | 212 | err_t |
sam_grove | 5:3f93dd1d4cb3 | 213 | snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length) |
sam_grove | 5:3f93dd1d4cb3 | 214 | { |
sam_grove | 5:3f93dd1d4cb3 | 215 | u16_t plen, base; |
sam_grove | 5:3f93dd1d4cb3 | 216 | u8_t *msg_ptr; |
sam_grove | 5:3f93dd1d4cb3 | 217 | |
sam_grove | 5:3f93dd1d4cb3 | 218 | plen = 0; |
sam_grove | 5:3f93dd1d4cb3 | 219 | while (p != NULL) |
sam_grove | 5:3f93dd1d4cb3 | 220 | { |
sam_grove | 5:3f93dd1d4cb3 | 221 | base = plen; |
sam_grove | 5:3f93dd1d4cb3 | 222 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 223 | if (ofs < plen) |
sam_grove | 5:3f93dd1d4cb3 | 224 | { |
sam_grove | 5:3f93dd1d4cb3 | 225 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 226 | msg_ptr += ofs - base; |
sam_grove | 5:3f93dd1d4cb3 | 227 | |
sam_grove | 5:3f93dd1d4cb3 | 228 | if (length < 0x80) |
sam_grove | 5:3f93dd1d4cb3 | 229 | { |
sam_grove | 5:3f93dd1d4cb3 | 230 | *msg_ptr = (u8_t)length; |
sam_grove | 5:3f93dd1d4cb3 | 231 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 232 | } |
sam_grove | 5:3f93dd1d4cb3 | 233 | else if (length < 0x100) |
sam_grove | 5:3f93dd1d4cb3 | 234 | { |
sam_grove | 5:3f93dd1d4cb3 | 235 | *msg_ptr = 0x81; |
sam_grove | 5:3f93dd1d4cb3 | 236 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 237 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 238 | { |
sam_grove | 5:3f93dd1d4cb3 | 239 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 240 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 241 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 242 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 243 | } |
sam_grove | 5:3f93dd1d4cb3 | 244 | else |
sam_grove | 5:3f93dd1d4cb3 | 245 | { |
sam_grove | 5:3f93dd1d4cb3 | 246 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 247 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 248 | } |
sam_grove | 5:3f93dd1d4cb3 | 249 | *msg_ptr = (u8_t)length; |
sam_grove | 5:3f93dd1d4cb3 | 250 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 251 | } |
sam_grove | 5:3f93dd1d4cb3 | 252 | else |
sam_grove | 5:3f93dd1d4cb3 | 253 | { |
sam_grove | 5:3f93dd1d4cb3 | 254 | u8_t i; |
sam_grove | 5:3f93dd1d4cb3 | 255 | |
sam_grove | 5:3f93dd1d4cb3 | 256 | /* length >= 0x100 && length <= 0xFFFF */ |
sam_grove | 5:3f93dd1d4cb3 | 257 | *msg_ptr = 0x82; |
sam_grove | 5:3f93dd1d4cb3 | 258 | i = 2; |
sam_grove | 5:3f93dd1d4cb3 | 259 | while (i > 0) |
sam_grove | 5:3f93dd1d4cb3 | 260 | { |
sam_grove | 5:3f93dd1d4cb3 | 261 | i--; |
sam_grove | 5:3f93dd1d4cb3 | 262 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 263 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 264 | { |
sam_grove | 5:3f93dd1d4cb3 | 265 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 266 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 267 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 268 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 269 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 270 | } |
sam_grove | 5:3f93dd1d4cb3 | 271 | else |
sam_grove | 5:3f93dd1d4cb3 | 272 | { |
sam_grove | 5:3f93dd1d4cb3 | 273 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 274 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 275 | } |
sam_grove | 5:3f93dd1d4cb3 | 276 | if (i == 0) |
sam_grove | 5:3f93dd1d4cb3 | 277 | { |
sam_grove | 5:3f93dd1d4cb3 | 278 | /* least significant length octet */ |
sam_grove | 5:3f93dd1d4cb3 | 279 | *msg_ptr = (u8_t)length; |
sam_grove | 5:3f93dd1d4cb3 | 280 | } |
sam_grove | 5:3f93dd1d4cb3 | 281 | else |
sam_grove | 5:3f93dd1d4cb3 | 282 | { |
sam_grove | 5:3f93dd1d4cb3 | 283 | /* most significant length octet */ |
sam_grove | 5:3f93dd1d4cb3 | 284 | *msg_ptr = (u8_t)(length >> 8); |
sam_grove | 5:3f93dd1d4cb3 | 285 | } |
sam_grove | 5:3f93dd1d4cb3 | 286 | } |
sam_grove | 5:3f93dd1d4cb3 | 287 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 288 | } |
sam_grove | 5:3f93dd1d4cb3 | 289 | } |
sam_grove | 5:3f93dd1d4cb3 | 290 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 291 | } |
sam_grove | 5:3f93dd1d4cb3 | 292 | /* p == NULL, ofs >= plen */ |
sam_grove | 5:3f93dd1d4cb3 | 293 | return ERR_ARG; |
sam_grove | 5:3f93dd1d4cb3 | 294 | } |
sam_grove | 5:3f93dd1d4cb3 | 295 | |
sam_grove | 5:3f93dd1d4cb3 | 296 | /** |
sam_grove | 5:3f93dd1d4cb3 | 297 | * Encodes u32_t (counter, gauge, timeticks) into a pbuf chained ASN1 msg. |
sam_grove | 5:3f93dd1d4cb3 | 298 | * |
sam_grove | 5:3f93dd1d4cb3 | 299 | * @param p points to output pbuf to encode value into |
sam_grove | 5:3f93dd1d4cb3 | 300 | * @param ofs points to the offset within the pbuf chain |
sam_grove | 5:3f93dd1d4cb3 | 301 | * @param octets_needed encoding length (from snmp_asn1_enc_u32t_cnt()) |
sam_grove | 5:3f93dd1d4cb3 | 302 | * @param value is the host order u32_t value to be encoded |
sam_grove | 5:3f93dd1d4cb3 | 303 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
sam_grove | 5:3f93dd1d4cb3 | 304 | * |
sam_grove | 5:3f93dd1d4cb3 | 305 | * @see snmp_asn1_enc_u32t_cnt() |
sam_grove | 5:3f93dd1d4cb3 | 306 | */ |
sam_grove | 5:3f93dd1d4cb3 | 307 | err_t |
sam_grove | 5:3f93dd1d4cb3 | 308 | snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value) |
sam_grove | 5:3f93dd1d4cb3 | 309 | { |
sam_grove | 5:3f93dd1d4cb3 | 310 | u16_t plen, base; |
sam_grove | 5:3f93dd1d4cb3 | 311 | u8_t *msg_ptr; |
sam_grove | 5:3f93dd1d4cb3 | 312 | |
sam_grove | 5:3f93dd1d4cb3 | 313 | plen = 0; |
sam_grove | 5:3f93dd1d4cb3 | 314 | while (p != NULL) |
sam_grove | 5:3f93dd1d4cb3 | 315 | { |
sam_grove | 5:3f93dd1d4cb3 | 316 | base = plen; |
sam_grove | 5:3f93dd1d4cb3 | 317 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 318 | if (ofs < plen) |
sam_grove | 5:3f93dd1d4cb3 | 319 | { |
sam_grove | 5:3f93dd1d4cb3 | 320 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 321 | msg_ptr += ofs - base; |
sam_grove | 5:3f93dd1d4cb3 | 322 | |
sam_grove | 5:3f93dd1d4cb3 | 323 | if (octets_needed == 5) |
sam_grove | 5:3f93dd1d4cb3 | 324 | { |
sam_grove | 5:3f93dd1d4cb3 | 325 | /* not enough bits in 'value' add leading 0x00 */ |
sam_grove | 5:3f93dd1d4cb3 | 326 | octets_needed--; |
sam_grove | 5:3f93dd1d4cb3 | 327 | *msg_ptr = 0x00; |
sam_grove | 5:3f93dd1d4cb3 | 328 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 329 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 330 | { |
sam_grove | 5:3f93dd1d4cb3 | 331 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 332 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 333 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 334 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 335 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 336 | } |
sam_grove | 5:3f93dd1d4cb3 | 337 | else |
sam_grove | 5:3f93dd1d4cb3 | 338 | { |
sam_grove | 5:3f93dd1d4cb3 | 339 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 340 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 341 | } |
sam_grove | 5:3f93dd1d4cb3 | 342 | } |
sam_grove | 5:3f93dd1d4cb3 | 343 | while (octets_needed > 1) |
sam_grove | 5:3f93dd1d4cb3 | 344 | { |
sam_grove | 5:3f93dd1d4cb3 | 345 | octets_needed--; |
sam_grove | 5:3f93dd1d4cb3 | 346 | *msg_ptr = (u8_t)(value >> (octets_needed << 3)); |
sam_grove | 5:3f93dd1d4cb3 | 347 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 348 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 349 | { |
sam_grove | 5:3f93dd1d4cb3 | 350 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 351 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 352 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 353 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 354 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 355 | } |
sam_grove | 5:3f93dd1d4cb3 | 356 | else |
sam_grove | 5:3f93dd1d4cb3 | 357 | { |
sam_grove | 5:3f93dd1d4cb3 | 358 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 359 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 360 | } |
sam_grove | 5:3f93dd1d4cb3 | 361 | } |
sam_grove | 5:3f93dd1d4cb3 | 362 | /* (only) one least significant octet */ |
sam_grove | 5:3f93dd1d4cb3 | 363 | *msg_ptr = (u8_t)value; |
sam_grove | 5:3f93dd1d4cb3 | 364 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 365 | } |
sam_grove | 5:3f93dd1d4cb3 | 366 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 367 | } |
sam_grove | 5:3f93dd1d4cb3 | 368 | /* p == NULL, ofs >= plen */ |
sam_grove | 5:3f93dd1d4cb3 | 369 | return ERR_ARG; |
sam_grove | 5:3f93dd1d4cb3 | 370 | } |
sam_grove | 5:3f93dd1d4cb3 | 371 | |
sam_grove | 5:3f93dd1d4cb3 | 372 | /** |
sam_grove | 5:3f93dd1d4cb3 | 373 | * Encodes s32_t integer into a pbuf chained ASN1 msg. |
sam_grove | 5:3f93dd1d4cb3 | 374 | * |
sam_grove | 5:3f93dd1d4cb3 | 375 | * @param p points to output pbuf to encode value into |
sam_grove | 5:3f93dd1d4cb3 | 376 | * @param ofs points to the offset within the pbuf chain |
sam_grove | 5:3f93dd1d4cb3 | 377 | * @param octets_needed encoding length (from snmp_asn1_enc_s32t_cnt()) |
sam_grove | 5:3f93dd1d4cb3 | 378 | * @param value is the host order s32_t value to be encoded |
sam_grove | 5:3f93dd1d4cb3 | 379 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
sam_grove | 5:3f93dd1d4cb3 | 380 | * |
sam_grove | 5:3f93dd1d4cb3 | 381 | * @see snmp_asn1_enc_s32t_cnt() |
sam_grove | 5:3f93dd1d4cb3 | 382 | */ |
sam_grove | 5:3f93dd1d4cb3 | 383 | err_t |
sam_grove | 5:3f93dd1d4cb3 | 384 | snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value) |
sam_grove | 5:3f93dd1d4cb3 | 385 | { |
sam_grove | 5:3f93dd1d4cb3 | 386 | u16_t plen, base; |
sam_grove | 5:3f93dd1d4cb3 | 387 | u8_t *msg_ptr; |
sam_grove | 5:3f93dd1d4cb3 | 388 | |
sam_grove | 5:3f93dd1d4cb3 | 389 | plen = 0; |
sam_grove | 5:3f93dd1d4cb3 | 390 | while (p != NULL) |
sam_grove | 5:3f93dd1d4cb3 | 391 | { |
sam_grove | 5:3f93dd1d4cb3 | 392 | base = plen; |
sam_grove | 5:3f93dd1d4cb3 | 393 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 394 | if (ofs < plen) |
sam_grove | 5:3f93dd1d4cb3 | 395 | { |
sam_grove | 5:3f93dd1d4cb3 | 396 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 397 | msg_ptr += ofs - base; |
sam_grove | 5:3f93dd1d4cb3 | 398 | |
sam_grove | 5:3f93dd1d4cb3 | 399 | while (octets_needed > 1) |
sam_grove | 5:3f93dd1d4cb3 | 400 | { |
sam_grove | 5:3f93dd1d4cb3 | 401 | octets_needed--; |
sam_grove | 5:3f93dd1d4cb3 | 402 | *msg_ptr = (u8_t)(value >> (octets_needed << 3)); |
sam_grove | 5:3f93dd1d4cb3 | 403 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 404 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 405 | { |
sam_grove | 5:3f93dd1d4cb3 | 406 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 407 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 408 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 409 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 410 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 411 | } |
sam_grove | 5:3f93dd1d4cb3 | 412 | else |
sam_grove | 5:3f93dd1d4cb3 | 413 | { |
sam_grove | 5:3f93dd1d4cb3 | 414 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 415 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 416 | } |
sam_grove | 5:3f93dd1d4cb3 | 417 | } |
sam_grove | 5:3f93dd1d4cb3 | 418 | /* (only) one least significant octet */ |
sam_grove | 5:3f93dd1d4cb3 | 419 | *msg_ptr = (u8_t)value; |
sam_grove | 5:3f93dd1d4cb3 | 420 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 421 | } |
sam_grove | 5:3f93dd1d4cb3 | 422 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 423 | } |
sam_grove | 5:3f93dd1d4cb3 | 424 | /* p == NULL, ofs >= plen */ |
sam_grove | 5:3f93dd1d4cb3 | 425 | return ERR_ARG; |
sam_grove | 5:3f93dd1d4cb3 | 426 | } |
sam_grove | 5:3f93dd1d4cb3 | 427 | |
sam_grove | 5:3f93dd1d4cb3 | 428 | /** |
sam_grove | 5:3f93dd1d4cb3 | 429 | * Encodes object identifier into a pbuf chained ASN1 msg. |
sam_grove | 5:3f93dd1d4cb3 | 430 | * |
sam_grove | 5:3f93dd1d4cb3 | 431 | * @param p points to output pbuf to encode oid into |
sam_grove | 5:3f93dd1d4cb3 | 432 | * @param ofs points to the offset within the pbuf chain |
sam_grove | 5:3f93dd1d4cb3 | 433 | * @param ident_len object identifier array length |
sam_grove | 5:3f93dd1d4cb3 | 434 | * @param ident points to object identifier array |
sam_grove | 5:3f93dd1d4cb3 | 435 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
sam_grove | 5:3f93dd1d4cb3 | 436 | */ |
sam_grove | 5:3f93dd1d4cb3 | 437 | err_t |
sam_grove | 5:3f93dd1d4cb3 | 438 | snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident) |
sam_grove | 5:3f93dd1d4cb3 | 439 | { |
sam_grove | 5:3f93dd1d4cb3 | 440 | u16_t plen, base; |
sam_grove | 5:3f93dd1d4cb3 | 441 | u8_t *msg_ptr; |
sam_grove | 5:3f93dd1d4cb3 | 442 | |
sam_grove | 5:3f93dd1d4cb3 | 443 | plen = 0; |
sam_grove | 5:3f93dd1d4cb3 | 444 | while (p != NULL) |
sam_grove | 5:3f93dd1d4cb3 | 445 | { |
sam_grove | 5:3f93dd1d4cb3 | 446 | base = plen; |
sam_grove | 5:3f93dd1d4cb3 | 447 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 448 | if (ofs < plen) |
sam_grove | 5:3f93dd1d4cb3 | 449 | { |
sam_grove | 5:3f93dd1d4cb3 | 450 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 451 | msg_ptr += ofs - base; |
sam_grove | 5:3f93dd1d4cb3 | 452 | |
sam_grove | 5:3f93dd1d4cb3 | 453 | if (ident_len > 1) |
sam_grove | 5:3f93dd1d4cb3 | 454 | { |
sam_grove | 5:3f93dd1d4cb3 | 455 | if ((ident[0] == 1) && (ident[1] == 3)) |
sam_grove | 5:3f93dd1d4cb3 | 456 | { |
sam_grove | 5:3f93dd1d4cb3 | 457 | /* compressed (most common) prefix .iso.org */ |
sam_grove | 5:3f93dd1d4cb3 | 458 | *msg_ptr = 0x2b; |
sam_grove | 5:3f93dd1d4cb3 | 459 | } |
sam_grove | 5:3f93dd1d4cb3 | 460 | else |
sam_grove | 5:3f93dd1d4cb3 | 461 | { |
sam_grove | 5:3f93dd1d4cb3 | 462 | /* calculate prefix */ |
sam_grove | 5:3f93dd1d4cb3 | 463 | *msg_ptr = (u8_t)((ident[0] * 40) + ident[1]); |
sam_grove | 5:3f93dd1d4cb3 | 464 | } |
sam_grove | 5:3f93dd1d4cb3 | 465 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 466 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 467 | { |
sam_grove | 5:3f93dd1d4cb3 | 468 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 469 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 470 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 471 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 472 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 473 | } |
sam_grove | 5:3f93dd1d4cb3 | 474 | else |
sam_grove | 5:3f93dd1d4cb3 | 475 | { |
sam_grove | 5:3f93dd1d4cb3 | 476 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 477 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 478 | } |
sam_grove | 5:3f93dd1d4cb3 | 479 | ident_len -= 2; |
sam_grove | 5:3f93dd1d4cb3 | 480 | ident += 2; |
sam_grove | 5:3f93dd1d4cb3 | 481 | } |
sam_grove | 5:3f93dd1d4cb3 | 482 | else |
sam_grove | 5:3f93dd1d4cb3 | 483 | { |
sam_grove | 5:3f93dd1d4cb3 | 484 | /* @bug: allow empty varbinds for symmetry (we must decode them for getnext), allow partial compression?? */ |
sam_grove | 5:3f93dd1d4cb3 | 485 | /* ident_len <= 1, at least we need zeroDotZero (0.0) (ident_len == 2) */ |
sam_grove | 5:3f93dd1d4cb3 | 486 | return ERR_ARG; |
sam_grove | 5:3f93dd1d4cb3 | 487 | } |
sam_grove | 5:3f93dd1d4cb3 | 488 | while (ident_len > 0) |
sam_grove | 5:3f93dd1d4cb3 | 489 | { |
sam_grove | 5:3f93dd1d4cb3 | 490 | s32_t sub_id; |
sam_grove | 5:3f93dd1d4cb3 | 491 | u8_t shift, tail; |
sam_grove | 5:3f93dd1d4cb3 | 492 | |
sam_grove | 5:3f93dd1d4cb3 | 493 | ident_len--; |
sam_grove | 5:3f93dd1d4cb3 | 494 | sub_id = *ident; |
sam_grove | 5:3f93dd1d4cb3 | 495 | tail = 0; |
sam_grove | 5:3f93dd1d4cb3 | 496 | shift = 28; |
sam_grove | 5:3f93dd1d4cb3 | 497 | while(shift > 0) |
sam_grove | 5:3f93dd1d4cb3 | 498 | { |
sam_grove | 5:3f93dd1d4cb3 | 499 | u8_t code; |
sam_grove | 5:3f93dd1d4cb3 | 500 | |
sam_grove | 5:3f93dd1d4cb3 | 501 | code = (u8_t)(sub_id >> shift); |
sam_grove | 5:3f93dd1d4cb3 | 502 | if ((code != 0) || (tail != 0)) |
sam_grove | 5:3f93dd1d4cb3 | 503 | { |
sam_grove | 5:3f93dd1d4cb3 | 504 | tail = 1; |
sam_grove | 5:3f93dd1d4cb3 | 505 | *msg_ptr = code | 0x80; |
sam_grove | 5:3f93dd1d4cb3 | 506 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 507 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 508 | { |
sam_grove | 5:3f93dd1d4cb3 | 509 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 510 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 511 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 512 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 513 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 514 | } |
sam_grove | 5:3f93dd1d4cb3 | 515 | else |
sam_grove | 5:3f93dd1d4cb3 | 516 | { |
sam_grove | 5:3f93dd1d4cb3 | 517 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 518 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 519 | } |
sam_grove | 5:3f93dd1d4cb3 | 520 | } |
sam_grove | 5:3f93dd1d4cb3 | 521 | shift -= 7; |
sam_grove | 5:3f93dd1d4cb3 | 522 | } |
sam_grove | 5:3f93dd1d4cb3 | 523 | *msg_ptr = (u8_t)sub_id & 0x7F; |
sam_grove | 5:3f93dd1d4cb3 | 524 | if (ident_len > 0) |
sam_grove | 5:3f93dd1d4cb3 | 525 | { |
sam_grove | 5:3f93dd1d4cb3 | 526 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 527 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 528 | { |
sam_grove | 5:3f93dd1d4cb3 | 529 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 530 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 531 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 532 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 533 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 534 | } |
sam_grove | 5:3f93dd1d4cb3 | 535 | else |
sam_grove | 5:3f93dd1d4cb3 | 536 | { |
sam_grove | 5:3f93dd1d4cb3 | 537 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 538 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 539 | } |
sam_grove | 5:3f93dd1d4cb3 | 540 | } |
sam_grove | 5:3f93dd1d4cb3 | 541 | /* proceed to next sub-identifier */ |
sam_grove | 5:3f93dd1d4cb3 | 542 | ident++; |
sam_grove | 5:3f93dd1d4cb3 | 543 | } |
sam_grove | 5:3f93dd1d4cb3 | 544 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 545 | } |
sam_grove | 5:3f93dd1d4cb3 | 546 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 547 | } |
sam_grove | 5:3f93dd1d4cb3 | 548 | /* p == NULL, ofs >= plen */ |
sam_grove | 5:3f93dd1d4cb3 | 549 | return ERR_ARG; |
sam_grove | 5:3f93dd1d4cb3 | 550 | } |
sam_grove | 5:3f93dd1d4cb3 | 551 | |
sam_grove | 5:3f93dd1d4cb3 | 552 | /** |
sam_grove | 5:3f93dd1d4cb3 | 553 | * Encodes raw data (octet string, opaque) into a pbuf chained ASN1 msg. |
sam_grove | 5:3f93dd1d4cb3 | 554 | * |
sam_grove | 5:3f93dd1d4cb3 | 555 | * @param p points to output pbuf to encode raw data into |
sam_grove | 5:3f93dd1d4cb3 | 556 | * @param ofs points to the offset within the pbuf chain |
sam_grove | 5:3f93dd1d4cb3 | 557 | * @param raw_len raw data length |
sam_grove | 5:3f93dd1d4cb3 | 558 | * @param raw points raw data |
sam_grove | 5:3f93dd1d4cb3 | 559 | * @return ERR_OK if successfull, ERR_ARG if we can't (or won't) encode |
sam_grove | 5:3f93dd1d4cb3 | 560 | */ |
sam_grove | 5:3f93dd1d4cb3 | 561 | err_t |
sam_grove | 5:3f93dd1d4cb3 | 562 | snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw) |
sam_grove | 5:3f93dd1d4cb3 | 563 | { |
sam_grove | 5:3f93dd1d4cb3 | 564 | u16_t plen, base; |
sam_grove | 5:3f93dd1d4cb3 | 565 | u8_t *msg_ptr; |
sam_grove | 5:3f93dd1d4cb3 | 566 | |
sam_grove | 5:3f93dd1d4cb3 | 567 | plen = 0; |
sam_grove | 5:3f93dd1d4cb3 | 568 | while (p != NULL) |
sam_grove | 5:3f93dd1d4cb3 | 569 | { |
sam_grove | 5:3f93dd1d4cb3 | 570 | base = plen; |
sam_grove | 5:3f93dd1d4cb3 | 571 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 572 | if (ofs < plen) |
sam_grove | 5:3f93dd1d4cb3 | 573 | { |
sam_grove | 5:3f93dd1d4cb3 | 574 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 575 | msg_ptr += ofs - base; |
sam_grove | 5:3f93dd1d4cb3 | 576 | |
sam_grove | 5:3f93dd1d4cb3 | 577 | while (raw_len > 1) |
sam_grove | 5:3f93dd1d4cb3 | 578 | { |
sam_grove | 5:3f93dd1d4cb3 | 579 | /* copy raw_len - 1 octets */ |
sam_grove | 5:3f93dd1d4cb3 | 580 | raw_len--; |
sam_grove | 5:3f93dd1d4cb3 | 581 | *msg_ptr = *raw; |
sam_grove | 5:3f93dd1d4cb3 | 582 | raw++; |
sam_grove | 5:3f93dd1d4cb3 | 583 | ofs += 1; |
sam_grove | 5:3f93dd1d4cb3 | 584 | if (ofs >= plen) |
sam_grove | 5:3f93dd1d4cb3 | 585 | { |
sam_grove | 5:3f93dd1d4cb3 | 586 | /* next octet in next pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 587 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 588 | if (p == NULL) { return ERR_ARG; } |
sam_grove | 5:3f93dd1d4cb3 | 589 | msg_ptr = (u8_t*)p->payload; |
sam_grove | 5:3f93dd1d4cb3 | 590 | plen += p->len; |
sam_grove | 5:3f93dd1d4cb3 | 591 | } |
sam_grove | 5:3f93dd1d4cb3 | 592 | else |
sam_grove | 5:3f93dd1d4cb3 | 593 | { |
sam_grove | 5:3f93dd1d4cb3 | 594 | /* next octet in same pbuf */ |
sam_grove | 5:3f93dd1d4cb3 | 595 | msg_ptr++; |
sam_grove | 5:3f93dd1d4cb3 | 596 | } |
sam_grove | 5:3f93dd1d4cb3 | 597 | } |
sam_grove | 5:3f93dd1d4cb3 | 598 | if (raw_len > 0) |
sam_grove | 5:3f93dd1d4cb3 | 599 | { |
sam_grove | 5:3f93dd1d4cb3 | 600 | /* copy last or single octet */ |
sam_grove | 5:3f93dd1d4cb3 | 601 | *msg_ptr = *raw; |
sam_grove | 5:3f93dd1d4cb3 | 602 | } |
sam_grove | 5:3f93dd1d4cb3 | 603 | return ERR_OK; |
sam_grove | 5:3f93dd1d4cb3 | 604 | } |
sam_grove | 5:3f93dd1d4cb3 | 605 | p = p->next; |
sam_grove | 5:3f93dd1d4cb3 | 606 | } |
sam_grove | 5:3f93dd1d4cb3 | 607 | /* p == NULL, ofs >= plen */ |
sam_grove | 5:3f93dd1d4cb3 | 608 | return ERR_ARG; |
sam_grove | 5:3f93dd1d4cb3 | 609 | } |
sam_grove | 5:3f93dd1d4cb3 | 610 | |
sam_grove | 5:3f93dd1d4cb3 | 611 | #endif /* LWIP_SNMP */ |