3 * SNMP output message processing (RFC1157).
5 * Output responses and traps are build in two passes:
7 * Pass 0: iterate over the output message backwards to determine encoding lengths
8 * Pass 1: the actual forward encoding of internal form into ASN1
10 * The single-pass encoding method described by Comer & Stevens
11 * requires extra buffer space and copying for reversal of the packet.
12 * The buffer requirement can be prohibitively large for big payloads
13 * (>= 484) therefore we use the two encoding passes.
17 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
18 * All rights reserved.
20 * Redistribution and use in source and binary forms, with or without modification,
21 * are permitted provided that the following conditions are met:
23 * 1. Redistributions of source code must retain the above copyright notice,
24 * this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright notice,
26 * this list of conditions and the following disclaimer in the documentation
27 * and/or other materials provided with the distribution.
28 * 3. The name of the author may not be used to endorse or promote products
29 * derived from this software without specific prior written permission.
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
42 * Author: Christiaan Simons <christiaan.simons@axon.tv>
47 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
50 #include "lwip/netif.h"
51 #include "lwip/snmp.h"
52 #include "lwip/snmp_asn1.h"
53 #include "lwip/snmp_msg.h"
57 /* destination IP address in network order */
59 /* set to 0 when disabled, >0 when enabled */
62 struct snmp_trap_dst trap_dst[SNMP_TRAP_DESTINATIONS];
64 /** TRAP message structure */
65 struct snmp_msg_trap trap_msg;
67 static u16_t snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len);
68 static u16_t snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len);
69 static u16_t snmp_varbind_list_sum(struct snmp_varbind_root *root);
71 static u16_t snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p);
72 static u16_t snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p);
73 static u16_t snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs);
76 * Sets enable switch for this trap destination.
77 * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
78 * @param enable switch if 0 destination is disabled >0 enabled.
81 snmp_trap_dst_enable(u8_t dst_idx, u8_t enable)
83 if (dst_idx < SNMP_TRAP_DESTINATIONS)
85 trap_dst[dst_idx].enable = enable;
90 * Sets IPv4 address for this trap destination.
91 * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
92 * @param dst IPv4 address in host order.
95 snmp_trap_dst_ip_set(u8_t dst_idx, ip_addr_t *dst)
97 if (dst_idx < SNMP_TRAP_DESTINATIONS)
99 ip_addr_set(&trap_dst[dst_idx].dip, dst);
104 * Sends a 'getresponse' message to the request originator.
106 * @param m_stat points to the current message request state source
107 * @return ERR_OK when success, ERR_MEM if we're out of memory
109 * @note the caller is responsible for filling in outvb in the m_stat
110 * and provide error-status and index (except for tooBig errors) ...
113 snmp_send_response(struct snmp_msg_pstat *m_stat)
115 struct snmp_varbind_root emptyvb = {NULL, NULL, 0, 0, 0};
120 /* pass 0, calculate length fields */
121 tot_len = snmp_varbind_list_sum(&m_stat->outvb);
122 tot_len = snmp_resp_header_sum(m_stat, tot_len);
124 /* try allocating pbuf(s) for complete response */
125 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
128 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() tooBig\n"));
130 /* can't construct reply, return error-status tooBig */
131 m_stat->error_status = SNMP_ES_TOOBIG;
132 m_stat->error_index = 0;
133 /* pass 0, recalculate lengths, for empty varbind-list */
134 tot_len = snmp_varbind_list_sum(&emptyvb);
135 tot_len = snmp_resp_header_sum(m_stat, tot_len);
136 /* retry allocation once for header and empty varbind-list */
137 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
141 /* first pbuf alloc try or retry alloc success */
144 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() p != NULL\n"));
146 /* pass 1, size error, encode packet ino the pbuf(s) */
147 ofs = snmp_resp_header_enc(m_stat, p);
148 snmp_varbind_list_enc(&m_stat->outvb, p, ofs);
150 switch (m_stat->error_status)
153 snmp_inc_snmpouttoobigs();
155 case SNMP_ES_NOSUCHNAME:
156 snmp_inc_snmpoutnosuchnames();
158 case SNMP_ES_BADVALUE:
159 snmp_inc_snmpoutbadvalues();
161 case SNMP_ES_GENERROR:
162 snmp_inc_snmpoutgenerrs();
165 snmp_inc_snmpoutgetresponses();
166 snmp_inc_snmpoutpkts();
168 /** @todo do we need separate rx and tx pcbs for threaded case? */
169 /** connect to the originating source */
170 udp_connect(m_stat->pcb, &m_stat->sip, m_stat->sp);
171 err = udp_send(m_stat->pcb, p);
174 /** @todo release some memory, retry and return tooBig? tooMuchHassle? */
181 /** disassociate remote address and port with this pcb */
182 udp_disconnect(m_stat->pcb);
185 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() done\n"));
190 /* first pbuf alloc try or retry alloc failed
191 very low on memory, couldn't return tooBig */
198 * Sends an generic or enterprise specific trap message.
200 * @param generic_trap is the trap code
201 * @param eoid points to enterprise object identifier
202 * @param specific_trap used for enterprise traps when generic_trap == 6
203 * @return ERR_OK when success, ERR_MEM if we're out of memory
205 * @note the caller is responsible for filling in outvb in the trap_msg
206 * @note the use of the enterpise identifier field
208 * Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps
209 * and .iso.org.dod.internet.private.enterprises.yourenterprise
210 * (sysObjectID) for specific traps.
213 snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap)
215 struct snmp_trap_dst *td;
216 struct netif *dst_if;
222 for (i=0, td = &trap_dst[0]; i<SNMP_TRAP_DESTINATIONS; i++, td++)
224 if ((td->enable != 0) && !ip_addr_isany(&td->dip))
226 /* network order trap destination */
227 ip_addr_copy(trap_msg.dip, td->dip);
228 /* lookup current source address for this dst */
229 dst_if = ip_route(&td->dip);
230 if (dst_if != NULL) {
231 ip_addr_copy(dst_ip, dst_if->ip_addr);
232 /* @todo: what about IPv6? */
233 trap_msg.sip_raw[0] = ip4_addr1(&dst_ip);
234 trap_msg.sip_raw[1] = ip4_addr2(&dst_ip);
235 trap_msg.sip_raw[2] = ip4_addr3(&dst_ip);
236 trap_msg.sip_raw[3] = ip4_addr4(&dst_ip);
237 trap_msg.gen_trap = generic_trap;
238 trap_msg.spc_trap = specific_trap;
239 if (generic_trap == SNMP_GENTRAP_ENTERPRISESPC)
241 /* enterprise-Specific trap */
242 trap_msg.enterprise = eoid;
246 /* generic (MIB-II) trap */
247 snmp_get_snmpgrpid_ptr(&trap_msg.enterprise);
249 snmp_get_sysuptime(&trap_msg.ts);
251 /* pass 0, calculate length fields */
252 tot_len = snmp_varbind_list_sum(&trap_msg.outvb);
253 tot_len = snmp_trap_header_sum(&trap_msg, tot_len);
255 /* allocate pbuf(s) */
256 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
261 /* pass 1, encode packet ino the pbuf(s) */
262 ofs = snmp_trap_header_enc(&trap_msg, p);
263 snmp_varbind_list_enc(&trap_msg.outvb, p, ofs);
265 snmp_inc_snmpouttraps();
266 snmp_inc_snmpoutpkts();
268 /** send to the TRAP destination */
269 udp_sendto(trap_msg.pcb, p, &trap_msg.dip, SNMP_TRAP_PORT);
285 snmp_coldstart_trap(void)
287 trap_msg.outvb.head = NULL;
288 trap_msg.outvb.tail = NULL;
289 trap_msg.outvb.count = 0;
290 snmp_send_trap(SNMP_GENTRAP_COLDSTART, NULL, 0);
294 snmp_authfail_trap(void)
297 snmp_get_snmpenableauthentraps(&enable);
300 trap_msg.outvb.head = NULL;
301 trap_msg.outvb.tail = NULL;
302 trap_msg.outvb.count = 0;
303 snmp_send_trap(SNMP_GENTRAP_AUTHFAIL, NULL, 0);
308 * Sums response header field lengths from tail to head and
309 * returns resp_header_lengths for second encoding pass.
311 * @param vb_len varbind-list length
312 * @param rhl points to returned header lengths
313 * @return the required lenght for encoding the response header
316 snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len)
319 struct snmp_resp_header_lengths *rhl;
323 snmp_asn1_enc_s32t_cnt(m_stat->error_index, &rhl->erridxlen);
324 snmp_asn1_enc_length_cnt(rhl->erridxlen, &rhl->erridxlenlen);
325 tot_len += 1 + rhl->erridxlenlen + rhl->erridxlen;
327 snmp_asn1_enc_s32t_cnt(m_stat->error_status, &rhl->errstatlen);
328 snmp_asn1_enc_length_cnt(rhl->errstatlen, &rhl->errstatlenlen);
329 tot_len += 1 + rhl->errstatlenlen + rhl->errstatlen;
331 snmp_asn1_enc_s32t_cnt(m_stat->rid, &rhl->ridlen);
332 snmp_asn1_enc_length_cnt(rhl->ridlen, &rhl->ridlenlen);
333 tot_len += 1 + rhl->ridlenlen + rhl->ridlen;
335 rhl->pdulen = tot_len;
336 snmp_asn1_enc_length_cnt(rhl->pdulen, &rhl->pdulenlen);
337 tot_len += 1 + rhl->pdulenlen;
339 rhl->comlen = m_stat->com_strlen;
340 snmp_asn1_enc_length_cnt(rhl->comlen, &rhl->comlenlen);
341 tot_len += 1 + rhl->comlenlen + rhl->comlen;
343 snmp_asn1_enc_s32t_cnt(snmp_version, &rhl->verlen);
344 snmp_asn1_enc_length_cnt(rhl->verlen, &rhl->verlenlen);
345 tot_len += 1 + rhl->verlen + rhl->verlenlen;
347 rhl->seqlen = tot_len;
348 snmp_asn1_enc_length_cnt(rhl->seqlen, &rhl->seqlenlen);
349 tot_len += 1 + rhl->seqlenlen;
355 * Sums trap header field lengths from tail to head and
356 * returns trap_header_lengths for second encoding pass.
358 * @param vb_len varbind-list length
359 * @param thl points to returned header lengths
360 * @return the required lenght for encoding the trap header
363 snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len)
366 struct snmp_trap_header_lengths *thl;
371 snmp_asn1_enc_u32t_cnt(m_trap->ts, &thl->tslen);
372 snmp_asn1_enc_length_cnt(thl->tslen, &thl->tslenlen);
373 tot_len += 1 + thl->tslen + thl->tslenlen;
375 snmp_asn1_enc_s32t_cnt(m_trap->spc_trap, &thl->strplen);
376 snmp_asn1_enc_length_cnt(thl->strplen, &thl->strplenlen);
377 tot_len += 1 + thl->strplen + thl->strplenlen;
379 snmp_asn1_enc_s32t_cnt(m_trap->gen_trap, &thl->gtrplen);
380 snmp_asn1_enc_length_cnt(thl->gtrplen, &thl->gtrplenlen);
381 tot_len += 1 + thl->gtrplen + thl->gtrplenlen;
384 snmp_asn1_enc_length_cnt(thl->aaddrlen, &thl->aaddrlenlen);
385 tot_len += 1 + thl->aaddrlen + thl->aaddrlenlen;
387 snmp_asn1_enc_oid_cnt(m_trap->enterprise->len, &m_trap->enterprise->id[0], &thl->eidlen);
388 snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen);
389 tot_len += 1 + thl->eidlen + thl->eidlenlen;
391 thl->pdulen = tot_len;
392 snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen);
393 tot_len += 1 + thl->pdulenlen;
395 thl->comlen = sizeof(snmp_publiccommunity) - 1;
396 snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen);
397 tot_len += 1 + thl->comlenlen + thl->comlen;
399 snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen);
400 snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen);
401 tot_len += 1 + thl->verlen + thl->verlenlen;
403 thl->seqlen = tot_len;
404 snmp_asn1_enc_length_cnt(thl->seqlen, &thl->seqlenlen);
405 tot_len += 1 + thl->seqlenlen;
411 * Sums varbind lengths from tail to head and
412 * annotates lengths in varbind for second encoding pass.
414 * @param root points to the root of the variable binding list
415 * @return the required lenght for encoding the variable bindings
418 snmp_varbind_list_sum(struct snmp_varbind_root *root)
420 struct snmp_varbind *vb;
429 /* encoded value lenght depends on type */
430 switch (vb->value_type)
432 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
433 sint_ptr = (s32_t*)vb->value;
434 snmp_asn1_enc_s32t_cnt(*sint_ptr, &vb->vlen);
436 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
437 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
438 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
439 uint_ptr = (u32_t*)vb->value;
440 snmp_asn1_enc_u32t_cnt(*uint_ptr, &vb->vlen);
442 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
443 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
444 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
445 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
446 vb->vlen = vb->value_len;
448 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
449 sint_ptr = (s32_t*)vb->value;
450 snmp_asn1_enc_oid_cnt(vb->value_len / sizeof(s32_t), sint_ptr, &vb->vlen);
453 /* unsupported type */
457 /* encoding length of value length field */
458 snmp_asn1_enc_length_cnt(vb->vlen, &vb->vlenlen);
459 snmp_asn1_enc_oid_cnt(vb->ident_len, vb->ident, &vb->olen);
460 snmp_asn1_enc_length_cnt(vb->olen, &vb->olenlen);
462 vb->seqlen = 1 + vb->vlenlen + vb->vlen;
463 vb->seqlen += 1 + vb->olenlen + vb->olen;
464 snmp_asn1_enc_length_cnt(vb->seqlen, &vb->seqlenlen);
467 tot_len += 1 + vb->seqlenlen + vb->seqlen;
472 /* varbind-list seq */
473 root->seqlen = tot_len;
474 snmp_asn1_enc_length_cnt(root->seqlen, &root->seqlenlen);
475 tot_len += 1 + root->seqlenlen;
481 * Encodes response header from head to tail.
484 snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p)
489 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
491 snmp_asn1_enc_length(p, ofs, m_stat->rhl.seqlen);
492 ofs += m_stat->rhl.seqlenlen;
494 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
496 snmp_asn1_enc_length(p, ofs, m_stat->rhl.verlen);
497 ofs += m_stat->rhl.verlenlen;
498 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.verlen, snmp_version);
499 ofs += m_stat->rhl.verlen;
501 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
503 snmp_asn1_enc_length(p, ofs, m_stat->rhl.comlen);
504 ofs += m_stat->rhl.comlenlen;
505 snmp_asn1_enc_raw(p, ofs, m_stat->rhl.comlen, m_stat->community);
506 ofs += m_stat->rhl.comlen;
508 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP));
510 snmp_asn1_enc_length(p, ofs, m_stat->rhl.pdulen);
511 ofs += m_stat->rhl.pdulenlen;
513 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
515 snmp_asn1_enc_length(p, ofs, m_stat->rhl.ridlen);
516 ofs += m_stat->rhl.ridlenlen;
517 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.ridlen, m_stat->rid);
518 ofs += m_stat->rhl.ridlen;
520 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
522 snmp_asn1_enc_length(p, ofs, m_stat->rhl.errstatlen);
523 ofs += m_stat->rhl.errstatlenlen;
524 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.errstatlen, m_stat->error_status);
525 ofs += m_stat->rhl.errstatlen;
527 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
529 snmp_asn1_enc_length(p, ofs, m_stat->rhl.erridxlen);
530 ofs += m_stat->rhl.erridxlenlen;
531 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.erridxlen, m_stat->error_index);
532 ofs += m_stat->rhl.erridxlen;
538 * Encodes trap header from head to tail.
541 snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p)
546 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
548 snmp_asn1_enc_length(p, ofs, m_trap->thl.seqlen);
549 ofs += m_trap->thl.seqlenlen;
551 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
553 snmp_asn1_enc_length(p, ofs, m_trap->thl.verlen);
554 ofs += m_trap->thl.verlenlen;
555 snmp_asn1_enc_s32t(p, ofs, m_trap->thl.verlen, snmp_version);
556 ofs += m_trap->thl.verlen;
558 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
560 snmp_asn1_enc_length(p, ofs, m_trap->thl.comlen);
561 ofs += m_trap->thl.comlenlen;
562 snmp_asn1_enc_raw(p, ofs, m_trap->thl.comlen, (u8_t *)&snmp_publiccommunity[0]);
563 ofs += m_trap->thl.comlen;
565 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP));
567 snmp_asn1_enc_length(p, ofs, m_trap->thl.pdulen);
568 ofs += m_trap->thl.pdulenlen;
570 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
572 snmp_asn1_enc_length(p, ofs, m_trap->thl.eidlen);
573 ofs += m_trap->thl.eidlenlen;
574 snmp_asn1_enc_oid(p, ofs, m_trap->enterprise->len, &m_trap->enterprise->id[0]);
575 ofs += m_trap->thl.eidlen;
577 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR));
579 snmp_asn1_enc_length(p, ofs, m_trap->thl.aaddrlen);
580 ofs += m_trap->thl.aaddrlenlen;
581 snmp_asn1_enc_raw(p, ofs, m_trap->thl.aaddrlen, &m_trap->sip_raw[0]);
582 ofs += m_trap->thl.aaddrlen;
584 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
586 snmp_asn1_enc_length(p, ofs, m_trap->thl.gtrplen);
587 ofs += m_trap->thl.gtrplenlen;
588 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.gtrplen, m_trap->gen_trap);
589 ofs += m_trap->thl.gtrplen;
591 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
593 snmp_asn1_enc_length(p, ofs, m_trap->thl.strplen);
594 ofs += m_trap->thl.strplenlen;
595 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.strplen, m_trap->spc_trap);
596 ofs += m_trap->thl.strplen;
598 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS));
600 snmp_asn1_enc_length(p, ofs, m_trap->thl.tslen);
601 ofs += m_trap->thl.tslenlen;
602 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.tslen, m_trap->ts);
603 ofs += m_trap->thl.tslen;
609 * Encodes varbind list from head to tail.
612 snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs)
614 struct snmp_varbind *vb;
619 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
621 snmp_asn1_enc_length(p, ofs, root->seqlen);
622 ofs += root->seqlenlen;
627 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
629 snmp_asn1_enc_length(p, ofs, vb->seqlen);
630 ofs += vb->seqlenlen;
632 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
634 snmp_asn1_enc_length(p, ofs, vb->olen);
636 snmp_asn1_enc_oid(p, ofs, vb->ident_len, &vb->ident[0]);
639 snmp_asn1_enc_type(p, ofs, vb->value_type);
641 snmp_asn1_enc_length(p, ofs, vb->vlen);
644 switch (vb->value_type)
646 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
647 sint_ptr = (s32_t*)vb->value;
648 snmp_asn1_enc_s32t(p, ofs, vb->vlen, *sint_ptr);
650 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
651 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
652 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
653 uint_ptr = (u32_t*)vb->value;
654 snmp_asn1_enc_u32t(p, ofs, vb->vlen, *uint_ptr);
656 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
657 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
658 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
659 raw_ptr = (u8_t*)vb->value;
660 snmp_asn1_enc_raw(p, ofs, vb->vlen, raw_ptr);
662 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
664 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
665 sint_ptr = (s32_t*)vb->value;
666 snmp_asn1_enc_oid(p, ofs, vb->value_len / sizeof(s32_t), sint_ptr);
669 /* unsupported type */
678 #endif /* LWIP_SNMP */