diff options
Diffstat (limited to 'lwip/src/include/lwip/apps/snmp_core.h')
| -rw-r--r-- | lwip/src/include/lwip/apps/snmp_core.h | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/lwip/src/include/lwip/apps/snmp_core.h b/lwip/src/include/lwip/apps/snmp_core.h new file mode 100644 index 0000000..6021c72 --- /dev/null +++ b/lwip/src/include/lwip/apps/snmp_core.h @@ -0,0 +1,377 @@ +/** + * @file + * SNMP core API for implementing MIBs + */ + +/* + * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * Author: Christiaan Simons <christiaan.simons@axon.tv> + * Martin Hentschel <info@cl-soft.de> + */ + +#ifndef LWIP_HDR_APPS_SNMP_CORE_H +#define LWIP_HDR_APPS_SNMP_CORE_H + +#include "lwip/apps/snmp_opts.h" + +#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */ + +#include "lwip/ip_addr.h" +#include "lwip/err.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/* basic ASN1 defines */ +#define SNMP_ASN1_CLASS_UNIVERSAL 0x00 +#define SNMP_ASN1_CLASS_APPLICATION 0x40 +#define SNMP_ASN1_CLASS_CONTEXT 0x80 +#define SNMP_ASN1_CLASS_PRIVATE 0xC0 + +#define SNMP_ASN1_CONTENTTYPE_PRIMITIVE 0x00 +#define SNMP_ASN1_CONTENTTYPE_CONSTRUCTED 0x20 + +/* universal tags (from ASN.1 spec.) */ +#define SNMP_ASN1_UNIVERSAL_END_OF_CONTENT 0 +#define SNMP_ASN1_UNIVERSAL_INTEGER 2 +#define SNMP_ASN1_UNIVERSAL_OCTET_STRING 4 +#define SNMP_ASN1_UNIVERSAL_NULL 5 +#define SNMP_ASN1_UNIVERSAL_OBJECT_ID 6 +#define SNMP_ASN1_UNIVERSAL_SEQUENCE_OF 16 + +/* application specific (SNMP) tags (from SNMPv2-SMI) */ +#define SNMP_ASN1_APPLICATION_IPADDR 0 /* [APPLICATION 0] IMPLICIT OCTET STRING (SIZE (4)) */ +#define SNMP_ASN1_APPLICATION_COUNTER 1 /* [APPLICATION 1] IMPLICIT INTEGER (0..4294967295) => u32_t */ +#define SNMP_ASN1_APPLICATION_GAUGE 2 /* [APPLICATION 2] IMPLICIT INTEGER (0..4294967295) => u32_t */ +#define SNMP_ASN1_APPLICATION_TIMETICKS 3 /* [APPLICATION 3] IMPLICIT INTEGER (0..4294967295) => u32_t */ +#define SNMP_ASN1_APPLICATION_OPAQUE 4 /* [APPLICATION 4] IMPLICIT OCTET STRING */ +#define SNMP_ASN1_APPLICATION_COUNTER64 6 /* [APPLICATION 6] IMPLICIT INTEGER (0..18446744073709551615) */ + +/* context specific (SNMP) tags (from RFC 1905) */ +#define SNMP_ASN1_CONTEXT_VARBIND_NO_SUCH_INSTANCE 1 + +/* full ASN1 type defines */ +#define SNMP_ASN1_TYPE_END_OF_CONTENT (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_END_OF_CONTENT) +#define SNMP_ASN1_TYPE_INTEGER (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_INTEGER) +#define SNMP_ASN1_TYPE_OCTET_STRING (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_OCTET_STRING) +#define SNMP_ASN1_TYPE_NULL (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_NULL) +#define SNMP_ASN1_TYPE_OBJECT_ID (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_OBJECT_ID) +#define SNMP_ASN1_TYPE_SEQUENCE (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_CONSTRUCTED | SNMP_ASN1_UNIVERSAL_SEQUENCE_OF) +#define SNMP_ASN1_TYPE_IPADDR (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_IPADDR) +#define SNMP_ASN1_TYPE_IPADDRESS SNMP_ASN1_TYPE_IPADDR +#define SNMP_ASN1_TYPE_COUNTER (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_COUNTER) +#define SNMP_ASN1_TYPE_COUNTER32 SNMP_ASN1_TYPE_COUNTER +#define SNMP_ASN1_TYPE_GAUGE (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_GAUGE) +#define SNMP_ASN1_TYPE_GAUGE32 SNMP_ASN1_TYPE_GAUGE +#define SNMP_ASN1_TYPE_UNSIGNED32 SNMP_ASN1_TYPE_GAUGE +#define SNMP_ASN1_TYPE_TIMETICKS (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_TIMETICKS) +#define SNMP_ASN1_TYPE_OPAQUE (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_OPAQUE) +#if LWIP_HAVE_INT64 +#define SNMP_ASN1_TYPE_COUNTER64 (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_COUNTER64) +#endif + +#define SNMP_VARBIND_EXCEPTION_OFFSET 0xF0 +#define SNMP_VARBIND_EXCEPTION_MASK 0x0F + +/** error codes predefined by SNMP prot. */ +typedef enum { + SNMP_ERR_NOERROR = 0, +/* +outdated v1 error codes. do not use anmore! +#define SNMP_ERR_NOSUCHNAME 2 use SNMP_ERR_NOSUCHINSTANCE instead +#define SNMP_ERR_BADVALUE 3 use SNMP_ERR_WRONGTYPE,SNMP_ERR_WRONGLENGTH,SNMP_ERR_WRONGENCODING or SNMP_ERR_WRONGVALUE instead +#define SNMP_ERR_READONLY 4 use SNMP_ERR_NOTWRITABLE instead +*/ + SNMP_ERR_GENERROR = 5, + SNMP_ERR_NOACCESS = 6, + SNMP_ERR_WRONGTYPE = 7, + SNMP_ERR_WRONGLENGTH = 8, + SNMP_ERR_WRONGENCODING = 9, + SNMP_ERR_WRONGVALUE = 10, + SNMP_ERR_NOCREATION = 11, + SNMP_ERR_INCONSISTENTVALUE = 12, + SNMP_ERR_RESOURCEUNAVAILABLE = 13, + SNMP_ERR_COMMITFAILED = 14, + SNMP_ERR_UNDOFAILED = 15, + SNMP_ERR_NOTWRITABLE = 17, + SNMP_ERR_INCONSISTENTNAME = 18, + + SNMP_ERR_NOSUCHINSTANCE = SNMP_VARBIND_EXCEPTION_OFFSET + SNMP_ASN1_CONTEXT_VARBIND_NO_SUCH_INSTANCE +} snmp_err_t; + +/** internal object identifier representation */ +struct snmp_obj_id +{ + u8_t len; + u32_t id[SNMP_MAX_OBJ_ID_LEN]; +}; + +struct snmp_obj_id_const_ref +{ + u8_t len; + const u32_t* id; +}; + +extern const struct snmp_obj_id_const_ref snmp_zero_dot_zero; /* administrative identifier from SNMPv2-SMI */ + +/** SNMP variant value, used as reference in struct snmp_node_instance and table implementation */ +union snmp_variant_value +{ + void* ptr; + const void* const_ptr; + u32_t u32; + s32_t s32; +#if LWIP_HAVE_INT64 + u64_t u64; +#endif +}; + + +/** +SNMP MIB node types + tree node is the only node the stack can process in order to walk the tree, + all other nodes are assumed to be leaf nodes. + This cannot be an enum because users may want to define their own node types. +*/ +#define SNMP_NODE_TREE 0x00 +/* predefined leaf node types */ +#define SNMP_NODE_SCALAR 0x01 +#define SNMP_NODE_SCALAR_ARRAY 0x02 +#define SNMP_NODE_TABLE 0x03 +#define SNMP_NODE_THREADSYNC 0x04 + +/** node "base class" layout, the mandatory fields for a node */ +struct snmp_node +{ + /** one out of SNMP_NODE_TREE or any leaf node type (like SNMP_NODE_SCALAR) */ + u8_t node_type; + /** the number assigned to this node which used as part of the full OID */ + u32_t oid; +}; + +/** SNMP node instance access types */ +typedef enum { + SNMP_NODE_INSTANCE_ACCESS_READ = 1, + SNMP_NODE_INSTANCE_ACCESS_WRITE = 2, + SNMP_NODE_INSTANCE_READ_ONLY = SNMP_NODE_INSTANCE_ACCESS_READ, + SNMP_NODE_INSTANCE_READ_WRITE = (SNMP_NODE_INSTANCE_ACCESS_READ | SNMP_NODE_INSTANCE_ACCESS_WRITE), + SNMP_NODE_INSTANCE_WRITE_ONLY = SNMP_NODE_INSTANCE_ACCESS_WRITE, + SNMP_NODE_INSTANCE_NOT_ACCESSIBLE = 0 +} snmp_access_t; + +struct snmp_node_instance; + +typedef s16_t (*node_instance_get_value_method)(struct snmp_node_instance*, void*); +typedef snmp_err_t (*node_instance_set_test_method)(struct snmp_node_instance*, u16_t, void*); +typedef snmp_err_t (*node_instance_set_value_method)(struct snmp_node_instance*, u16_t, void*); +typedef void (*node_instance_release_method)(struct snmp_node_instance*); + +#define SNMP_GET_VALUE_RAW_DATA 0x4000 /* do not use 0x8000 because return value of node_instance_get_value_method is signed16 and 0x8000 would be the signed bit */ + +/** SNMP node instance */ +struct snmp_node_instance +{ + /** prefilled with the node, get_instance() is called on; may be changed by user to any value to pass an arbitrary node between calls to get_instance() and get_value/test_value/set_value */ + const struct snmp_node* node; + /** prefilled with the instance id requested; for get_instance() this is the exact oid requested; for get_next_instance() this is the relative starting point, stack expects relative oid of next node here */ + struct snmp_obj_id instance_oid; + + /** ASN type for this object (see snmp_asn1.h for definitions) */ + u8_t asn1_type; + /** one out of instance access types defined above (SNMP_NODE_INSTANCE_READ_ONLY,...) */ + snmp_access_t access; + + /** returns object value for the given object identifier. Return values <0 to indicate an error */ + node_instance_get_value_method get_value; + /** tests length and/or range BEFORE setting */ + node_instance_set_test_method set_test; + /** sets object value, only called when set_test() was successful */ + node_instance_set_value_method set_value; + /** called in any case when the instance is not required anymore by stack (useful for freeing memory allocated in get_instance/get_next_instance methods) */ + node_instance_release_method release_instance; + + /** reference to pass arbitrary value between calls to get_instance() and get_value/test_value/set_value */ + union snmp_variant_value reference; + /** see reference (if reference is a pointer, the length of underlying data may be stored here or anything else) */ + u32_t reference_len; +}; + + +/** SNMP tree node */ +struct snmp_tree_node +{ + /** inherited "base class" members */ + struct snmp_node node; + u16_t subnode_count; + const struct snmp_node* const *subnodes; +}; + +#define SNMP_CREATE_TREE_NODE(oid, subnodes) \ + {{ SNMP_NODE_TREE, (oid) }, \ + (u16_t)LWIP_ARRAYSIZE(subnodes), (subnodes) } + +#define SNMP_CREATE_EMPTY_TREE_NODE(oid) \ + {{ SNMP_NODE_TREE, (oid) }, \ + 0, NULL } + +/** SNMP leaf node */ +struct snmp_leaf_node +{ + /** inherited "base class" members */ + struct snmp_node node; + snmp_err_t (*get_instance)(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance); + snmp_err_t (*get_next_instance)(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance); +}; + +/** represents a single mib with its base oid and root node */ +struct snmp_mib +{ + const u32_t *base_oid; + u8_t base_oid_len; + const struct snmp_node *root_node; +}; + +#define SNMP_MIB_CREATE(oid_list, root_node) { (oid_list), (u8_t)LWIP_ARRAYSIZE(oid_list), root_node } + +/** OID range structure */ +struct snmp_oid_range +{ + u32_t min; + u32_t max; +}; + +/** checks if incoming OID length and values are in allowed ranges */ +u8_t snmp_oid_in_range(const u32_t *oid_in, u8_t oid_len, const struct snmp_oid_range *oid_ranges, u8_t oid_ranges_len); + +typedef enum { + SNMP_NEXT_OID_STATUS_SUCCESS, + SNMP_NEXT_OID_STATUS_NO_MATCH, + SNMP_NEXT_OID_STATUS_BUF_TO_SMALL +} snmp_next_oid_status_t; + +/** state for next_oid_init / next_oid_check functions */ +struct snmp_next_oid_state +{ + const u32_t* start_oid; + u8_t start_oid_len; + + u32_t* next_oid; + u8_t next_oid_len; + u8_t next_oid_max_len; + + snmp_next_oid_status_t status; + void* reference; +}; + +void snmp_next_oid_init(struct snmp_next_oid_state *state, + const u32_t *start_oid, u8_t start_oid_len, + u32_t *next_oid_buf, u8_t next_oid_max_len); +u8_t snmp_next_oid_precheck(struct snmp_next_oid_state *state, const u32_t *oid, u8_t oid_len); +u8_t snmp_next_oid_check(struct snmp_next_oid_state *state, const u32_t *oid, u8_t oid_len, void* reference); + +void snmp_oid_assign(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len); +void snmp_oid_combine(struct snmp_obj_id* target, const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len); +void snmp_oid_prefix(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len); +void snmp_oid_append(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len); +u8_t snmp_oid_equal(const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len); +s8_t snmp_oid_compare(const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len); + +#if LWIP_IPV4 +u8_t snmp_oid_to_ip4(const u32_t *oid, ip4_addr_t *ip); +void snmp_ip4_to_oid(const ip4_addr_t *ip, u32_t *oid); +#endif /* LWIP_IPV4 */ +#if LWIP_IPV6 +u8_t snmp_oid_to_ip6(const u32_t *oid, ip6_addr_t *ip); +void snmp_ip6_to_oid(const ip6_addr_t *ip, u32_t *oid); +#endif /* LWIP_IPV6 */ +#if LWIP_IPV4 || LWIP_IPV6 +u8_t snmp_ip_to_oid(const ip_addr_t *ip, u32_t *oid); +u8_t snmp_ip_port_to_oid(const ip_addr_t *ip, u16_t port, u32_t *oid); + +u8_t snmp_oid_to_ip(const u32_t *oid, u8_t oid_len, ip_addr_t *ip); +u8_t snmp_oid_to_ip_port(const u32_t *oid, u8_t oid_len, ip_addr_t *ip, u16_t *port); +#endif /* LWIP_IPV4 || LWIP_IPV6 */ + +struct netif; +u8_t netif_to_num(const struct netif *netif); + +snmp_err_t snmp_set_test_ok(struct snmp_node_instance* instance, u16_t value_len, void* value); /* generic function which can be used if test is always successful */ + +err_t snmp_decode_bits(const u8_t *buf, u32_t buf_len, u32_t *bit_value); +err_t snmp_decode_truthvalue(const s32_t *asn1_value, u8_t *bool_value); +u8_t snmp_encode_bits(u8_t *buf, u32_t buf_len, u32_t bit_value, u8_t bit_count); +u8_t snmp_encode_truthvalue(s32_t *asn1_value, u32_t bool_value); + +struct snmp_statistics +{ + u32_t inpkts; + u32_t outpkts; + u32_t inbadversions; + u32_t inbadcommunitynames; + u32_t inbadcommunityuses; + u32_t inasnparseerrs; + u32_t intoobigs; + u32_t innosuchnames; + u32_t inbadvalues; + u32_t inreadonlys; + u32_t ingenerrs; + u32_t intotalreqvars; + u32_t intotalsetvars; + u32_t ingetrequests; + u32_t ingetnexts; + u32_t insetrequests; + u32_t ingetresponses; + u32_t intraps; + u32_t outtoobigs; + u32_t outnosuchnames; + u32_t outbadvalues; + u32_t outgenerrs; + u32_t outgetrequests; + u32_t outgetnexts; + u32_t outsetrequests; + u32_t outgetresponses; + u32_t outtraps; +#if LWIP_SNMP_V3 + u32_t unsupportedseclevels; + u32_t notintimewindows; + u32_t unknownusernames; + u32_t unknownengineids; + u32_t wrongdigests; + u32_t decryptionerrors; +#endif +}; + +extern struct snmp_statistics snmp_stats; + +#ifdef __cplusplus +} +#endif + +#endif /* LWIP_SNMP */ + +#endif /* LWIP_HDR_APPS_SNMP_CORE_H */ |