1 | /**
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2 | * @file
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3 | * Abstract Syntax Notation One (ISO 8824, 8825) codec.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * Author: Christiaan Simons <christiaan.simons@axon.tv>
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33 | */
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34 |
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35 | #ifndef __LWIP_SNMP_ASN1_H__
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36 | #define __LWIP_SNMP_ASN1_H__
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37 |
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38 | #include "lwip/opt.h"
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39 | #include "lwip/err.h"
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40 | #include "lwip/pbuf.h"
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41 | #include "lwip/snmp.h"
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42 |
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43 | #if LWIP_SNMP
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44 |
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45 | #ifdef __cplusplus
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46 | extern "C" {
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47 | #endif
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48 |
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49 | #define SNMP_ASN1_UNIV (0) /* (!0x80 | !0x40) */
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50 | #define SNMP_ASN1_APPLIC (0x40) /* (!0x80 | 0x40) */
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51 | #define SNMP_ASN1_CONTXT (0x80) /* ( 0x80 | !0x40) */
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52 |
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53 | #define SNMP_ASN1_CONSTR (0x20) /* ( 0x20) */
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54 | #define SNMP_ASN1_PRIMIT (0) /* (!0x20) */
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55 |
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56 | /* universal tags */
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57 | #define SNMP_ASN1_INTEG 2
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58 | #define SNMP_ASN1_OC_STR 4
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59 | #define SNMP_ASN1_NUL 5
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60 | #define SNMP_ASN1_OBJ_ID 6
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61 | #define SNMP_ASN1_SEQ 16
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62 |
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63 | /* application specific (SNMP) tags */
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64 | #define SNMP_ASN1_IPADDR 0 /* octet string size(4) */
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65 | #define SNMP_ASN1_COUNTER 1 /* u32_t */
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66 | #define SNMP_ASN1_GAUGE 2 /* u32_t */
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67 | #define SNMP_ASN1_TIMETICKS 3 /* u32_t */
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68 | #define SNMP_ASN1_OPAQUE 4 /* octet string */
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69 |
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70 | /* context specific (SNMP) tags */
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71 | #define SNMP_ASN1_PDU_GET_REQ 0
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72 | #define SNMP_ASN1_PDU_GET_NEXT_REQ 1
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73 | #define SNMP_ASN1_PDU_GET_RESP 2
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74 | #define SNMP_ASN1_PDU_SET_REQ 3
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75 | #define SNMP_ASN1_PDU_TRAP 4
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76 |
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77 | err_t snmp_asn1_dec_type(struct pbuf *p, u16_t ofs, u8_t *type);
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78 | err_t snmp_asn1_dec_length(struct pbuf *p, u16_t ofs, u8_t *octets_used, u16_t *length);
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79 | err_t snmp_asn1_dec_u32t(struct pbuf *p, u16_t ofs, u16_t len, u32_t *value);
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80 | err_t snmp_asn1_dec_s32t(struct pbuf *p, u16_t ofs, u16_t len, s32_t *value);
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81 | err_t snmp_asn1_dec_oid(struct pbuf *p, u16_t ofs, u16_t len, struct snmp_obj_id *oid);
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82 | err_t snmp_asn1_dec_raw(struct pbuf *p, u16_t ofs, u16_t len, u16_t raw_len, u8_t *raw);
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83 |
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84 | void snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed);
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85 | void snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed);
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86 | void snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed);
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87 | void snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed);
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88 | err_t snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type);
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89 | err_t snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length);
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90 | err_t snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value);
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91 | err_t snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value);
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92 | err_t snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident);
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93 | err_t snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw);
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94 |
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95 | #ifdef __cplusplus
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96 | }
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97 | #endif
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98 |
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99 | #endif /* LWIP_SNMP */
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100 |
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101 | #endif /* __LWIP_SNMP_ASN1_H__ */
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