3 * SNMP Agent message handling structures.
7 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
32 * Author: Christiaan Simons <christiaan.simons@axon.tv>
35 #ifndef __LWIP_SNMP_MSG_H__
36 #define __LWIP_SNMP_MSG_H__
40 #include "lwip/snmp.h"
41 #include "lwip/snmp_structs.h"
44 #include "private_mib.h"
47 #define SNMP_IN_PORT 161
48 #define SNMP_TRAP_PORT 162
50 #define SNMP_ES_NOERROR 0
51 #define SNMP_ES_TOOBIG 1
52 #define SNMP_ES_NOSUCHNAME 2
53 #define SNMP_ES_BADVALUE 3
54 #define SNMP_ES_READONLY 4
55 #define SNMP_ES_GENERROR 5
57 #define SNMP_GENTRAP_COLDSTART 0
58 #define SNMP_GENTRAP_WARMSTART 1
59 #define SNMP_GENTRAP_AUTHFAIL 4
60 #define SNMP_GENTRAP_ENTERPRISESPC 6
64 /* next pointer, NULL for last in list */
65 struct snmp_varbind *next;
66 /* previous pointer, NULL for first in list */
67 struct snmp_varbind *prev;
69 /* object identifier length (in s32_t) */
71 /* object identifier array */
74 /* object value ASN1 type */
76 /* object value length (in u8_t) */
81 /* encoding varbind seq length length */
83 /* encoding object identifier length length */
85 /* encoding object value length length */
87 /* encoding varbind seq length */
89 /* encoding object identifier length */
91 /* encoding object value length */
95 struct snmp_varbind_root
97 struct snmp_varbind *head;
98 struct snmp_varbind *tail;
99 /* number of variable bindings in list */
101 /* encoding varbind-list seq length length */
103 /* encoding varbind-list seq length */
107 /** output response message header length fields */
108 struct snmp_resp_header_lengths
110 /* encoding error-index length length */
112 /* encoding error-status length length */
114 /* encoding request id length length */
116 /* encoding pdu length length */
118 /* encoding community length length */
120 /* encoding version length length */
122 /* encoding sequence length length */
125 /* encoding error-index length */
127 /* encoding error-status length */
129 /* encoding request id length */
131 /* encoding pdu length */
133 /* encoding community length */
135 /* encoding version length */
137 /* encoding sequence length */
141 /** output response message header length fields */
142 struct snmp_trap_header_lengths
144 /* encoding timestamp length length */
146 /* encoding specific-trap length length */
148 /* encoding generic-trap length length */
150 /* encoding agent-addr length length */
152 /* encoding enterprise-id length length */
154 /* encoding pdu length length */
156 /* encoding community length length */
158 /* encoding version length length */
160 /* encoding sequence length length */
163 /* encoding timestamp length */
165 /* encoding specific-trap length */
167 /* encoding generic-trap length */
169 /* encoding agent-addr length */
171 /* encoding enterprise-id length */
173 /* encoding pdu length */
175 /* encoding community length */
177 /* encoding version length */
179 /* encoding sequence length */
183 /* Accepting new SNMP messages. */
184 #define SNMP_MSG_EMPTY 0
185 /* Search for matching object for variable binding. */
186 #define SNMP_MSG_SEARCH_OBJ 1
187 /* Perform SNMP operation on in-memory object.
188 Pass-through states, for symmetry only. */
189 #define SNMP_MSG_INTERNAL_GET_OBJDEF 2
190 #define SNMP_MSG_INTERNAL_GET_VALUE 3
191 #define SNMP_MSG_INTERNAL_SET_TEST 4
192 #define SNMP_MSG_INTERNAL_GET_OBJDEF_S 5
193 #define SNMP_MSG_INTERNAL_SET_VALUE 6
194 /* Perform SNMP operation on object located externally.
195 In theory this could be used for building a proxy agent.
196 Practical use is for an enterprise spc. app. gateway. */
197 #define SNMP_MSG_EXTERNAL_GET_OBJDEF 7
198 #define SNMP_MSG_EXTERNAL_GET_VALUE 8
199 #define SNMP_MSG_EXTERNAL_SET_TEST 9
200 #define SNMP_MSG_EXTERNAL_GET_OBJDEF_S 10
201 #define SNMP_MSG_EXTERNAL_SET_VALUE 11
203 #define SNMP_COMMUNITY_STR_LEN 64
204 struct snmp_msg_pstat
206 /* lwIP local port (161) binding */
208 /* source IP address */
210 /* source UDP port */
220 /* community name (zero terminated) */
221 u8_t community[SNMP_COMMUNITY_STR_LEN + 1];
222 /* community string length (exclusive zero term) */
224 /* one out of MSG_EMPTY, MSG_DEMUX, MSG_INTERNAL, MSG_EXTERNAL_x */
226 /* saved arguments for MSG_EXTERNAL_x */
227 struct mib_external_node *ext_mib_node;
228 struct snmp_name_ptr ext_name_ptr;
229 struct obj_def ext_object_def;
230 struct snmp_obj_id ext_oid;
231 /* index into input variable binding list */
233 /* ptr into input variable binding list */
234 struct snmp_varbind *vb_ptr;
235 /* list of variable bindings from input */
236 struct snmp_varbind_root invb;
237 /* list of variable bindings to output */
238 struct snmp_varbind_root outvb;
239 /* output response lengths used in ASN encoding */
240 struct snmp_resp_header_lengths rhl;
245 /* lwIP local port (161) binding */
247 /* destination IP address in network order */
250 /* source enterprise ID (sysObjectID) */
251 struct snmp_obj_id *enterprise;
252 /* source IP address, raw network order format */
254 /* generic trap code */
256 /* specific trap code */
260 /* list of variable bindings to output */
261 struct snmp_varbind_root outvb;
262 /* output trap lengths used in ASN encoding */
263 struct snmp_trap_header_lengths thl;
266 /** Agent Version constant, 0 = v1 oddity */
267 extern const s32_t snmp_version;
268 /** Agent default "public" community string */
269 extern const char snmp_publiccommunity[7];
271 extern struct snmp_msg_trap trap_msg;
273 /** Agent setup, start listening to port 161. */
274 void snmp_init(void);
275 void snmp_trap_dst_enable(u8_t dst_idx, u8_t enable);
276 void snmp_trap_dst_ip_set(u8_t dst_idx, struct ip_addr *dst);
278 /** Varbind-list functions. */
279 struct snmp_varbind* snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len);
280 void snmp_varbind_free(struct snmp_varbind *vb);
281 void snmp_varbind_list_free(struct snmp_varbind_root *root);
282 void snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb);
283 struct snmp_varbind* snmp_varbind_tail_remove(struct snmp_varbind_root *root);
285 /** Handle an internal (recv) or external (private response) event. */
286 void snmp_msg_event(u8_t request_id);
287 err_t snmp_send_response(struct snmp_msg_pstat *m_stat);
288 err_t snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap);
289 void snmp_coldstart_trap(void);
290 void snmp_authfail_trap(void);