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 if (m_stat->error_status == SNMP_ES_TOOBIG)
150 snmp_varbind_list_enc(&emptyvb, p, ofs);
154 snmp_varbind_list_enc(&m_stat->outvb, p, ofs);
157 switch (m_stat->error_status)
160 snmp_inc_snmpouttoobigs();
162 case SNMP_ES_NOSUCHNAME:
163 snmp_inc_snmpoutnosuchnames();
165 case SNMP_ES_BADVALUE:
166 snmp_inc_snmpoutbadvalues();
168 case SNMP_ES_GENERROR:
169 snmp_inc_snmpoutgenerrs();
172 snmp_inc_snmpoutgetresponses();
173 snmp_inc_snmpoutpkts();
175 /** @todo do we need separate rx and tx pcbs for threaded case? */
176 /** connect to the originating source */
177 udp_connect(m_stat->pcb, &m_stat->sip, m_stat->sp);
178 err = udp_send(m_stat->pcb, p);
181 /** @todo release some memory, retry and return tooBig? tooMuchHassle? */
188 /** disassociate remote address and port with this pcb */
189 udp_disconnect(m_stat->pcb);
192 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() done\n"));
197 /* first pbuf alloc try or retry alloc failed
198 very low on memory, couldn't return tooBig */
205 * Sends an generic or enterprise specific trap message.
207 * @param generic_trap is the trap code
208 * @param eoid points to enterprise object identifier
209 * @param specific_trap used for enterprise traps when generic_trap == 6
210 * @return ERR_OK when success, ERR_MEM if we're out of memory
212 * @note the caller is responsible for filling in outvb in the trap_msg
213 * @note the use of the enterpise identifier field
215 * Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps
216 * and .iso.org.dod.internet.private.enterprises.yourenterprise
217 * (sysObjectID) for specific traps.
220 snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap)
222 struct snmp_trap_dst *td;
223 struct netif *dst_if;
228 for (i=0, td = &trap_dst[0]; i<SNMP_TRAP_DESTINATIONS; i++, td++)
230 if ((td->enable != 0) && !ip_addr_isany(&td->dip))
232 /* network order trap destination */
233 ip_addr_copy(trap_msg.dip, td->dip);
234 /* lookup current source address for this dst */
235 dst_if = ip_route(&td->dip);
236 ip_addr_copy(dst_ip, dst_if->ip_addr);
237 /* @todo: what about IPv6? */
238 trap_msg.sip_raw[0] = ip4_addr1(&dst_ip);
239 trap_msg.sip_raw[1] = ip4_addr2(&dst_ip);
240 trap_msg.sip_raw[2] = ip4_addr3(&dst_ip);
241 trap_msg.sip_raw[3] = ip4_addr4(&dst_ip);
242 trap_msg.gen_trap = generic_trap;
243 trap_msg.spc_trap = specific_trap;
244 if (generic_trap == SNMP_GENTRAP_ENTERPRISESPC)
246 /* enterprise-Specific trap */
247 trap_msg.enterprise = eoid;
251 /* generic (MIB-II) trap */
252 snmp_get_snmpgrpid_ptr(&trap_msg.enterprise);
254 snmp_get_sysuptime(&trap_msg.ts);
256 /* pass 0, calculate length fields */
257 tot_len = snmp_varbind_list_sum(&trap_msg.outvb);
258 tot_len = snmp_trap_header_sum(&trap_msg, tot_len);
260 /* allocate pbuf(s) */
261 p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
266 /* pass 1, encode packet ino the pbuf(s) */
267 ofs = snmp_trap_header_enc(&trap_msg, p);
268 snmp_varbind_list_enc(&trap_msg.outvb, p, ofs);
270 snmp_inc_snmpouttraps();
271 snmp_inc_snmpoutpkts();
273 /** send to the TRAP destination */
274 udp_sendto(trap_msg.pcb, p, &trap_msg.dip, SNMP_TRAP_PORT);
288 snmp_coldstart_trap(void)
290 trap_msg.outvb.head = NULL;
291 trap_msg.outvb.tail = NULL;
292 trap_msg.outvb.count = 0;
293 snmp_send_trap(SNMP_GENTRAP_COLDSTART, NULL, 0);
297 snmp_authfail_trap(void)
300 snmp_get_snmpenableauthentraps(&enable);
303 trap_msg.outvb.head = NULL;
304 trap_msg.outvb.tail = NULL;
305 trap_msg.outvb.count = 0;
306 snmp_send_trap(SNMP_GENTRAP_AUTHFAIL, NULL, 0);
311 * Sums response header field lengths from tail to head and
312 * returns resp_header_lengths for second encoding pass.
314 * @param vb_len varbind-list length
315 * @param rhl points to returned header lengths
316 * @return the required lenght for encoding the response header
319 snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len)
322 struct snmp_resp_header_lengths *rhl;
326 snmp_asn1_enc_s32t_cnt(m_stat->error_index, &rhl->erridxlen);
327 snmp_asn1_enc_length_cnt(rhl->erridxlen, &rhl->erridxlenlen);
328 tot_len += 1 + rhl->erridxlenlen + rhl->erridxlen;
330 snmp_asn1_enc_s32t_cnt(m_stat->error_status, &rhl->errstatlen);
331 snmp_asn1_enc_length_cnt(rhl->errstatlen, &rhl->errstatlenlen);
332 tot_len += 1 + rhl->errstatlenlen + rhl->errstatlen;
334 snmp_asn1_enc_s32t_cnt(m_stat->rid, &rhl->ridlen);
335 snmp_asn1_enc_length_cnt(rhl->ridlen, &rhl->ridlenlen);
336 tot_len += 1 + rhl->ridlenlen + rhl->ridlen;
338 rhl->pdulen = tot_len;
339 snmp_asn1_enc_length_cnt(rhl->pdulen, &rhl->pdulenlen);
340 tot_len += 1 + rhl->pdulenlen;
342 rhl->comlen = m_stat->com_strlen;
343 snmp_asn1_enc_length_cnt(rhl->comlen, &rhl->comlenlen);
344 tot_len += 1 + rhl->comlenlen + rhl->comlen;
346 snmp_asn1_enc_s32t_cnt(snmp_version, &rhl->verlen);
347 snmp_asn1_enc_length_cnt(rhl->verlen, &rhl->verlenlen);
348 tot_len += 1 + rhl->verlen + rhl->verlenlen;
350 rhl->seqlen = tot_len;
351 snmp_asn1_enc_length_cnt(rhl->seqlen, &rhl->seqlenlen);
352 tot_len += 1 + rhl->seqlenlen;
358 * Sums trap header field lengths from tail to head and
359 * returns trap_header_lengths for second encoding pass.
361 * @param vb_len varbind-list length
362 * @param thl points to returned header lengths
363 * @return the required lenght for encoding the trap header
366 snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len)
369 struct snmp_trap_header_lengths *thl;
374 snmp_asn1_enc_u32t_cnt(m_trap->ts, &thl->tslen);
375 snmp_asn1_enc_length_cnt(thl->tslen, &thl->tslenlen);
376 tot_len += 1 + thl->tslen + thl->tslenlen;
378 snmp_asn1_enc_s32t_cnt(m_trap->spc_trap, &thl->strplen);
379 snmp_asn1_enc_length_cnt(thl->strplen, &thl->strplenlen);
380 tot_len += 1 + thl->strplen + thl->strplenlen;
382 snmp_asn1_enc_s32t_cnt(m_trap->gen_trap, &thl->gtrplen);
383 snmp_asn1_enc_length_cnt(thl->gtrplen, &thl->gtrplenlen);
384 tot_len += 1 + thl->gtrplen + thl->gtrplenlen;
387 snmp_asn1_enc_length_cnt(thl->aaddrlen, &thl->aaddrlenlen);
388 tot_len += 1 + thl->aaddrlen + thl->aaddrlenlen;
390 snmp_asn1_enc_oid_cnt(m_trap->enterprise->len, &m_trap->enterprise->id[0], &thl->eidlen);
391 snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen);
392 tot_len += 1 + thl->eidlen + thl->eidlenlen;
394 thl->pdulen = tot_len;
395 snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen);
396 tot_len += 1 + thl->pdulenlen;
398 thl->comlen = sizeof(snmp_publiccommunity) - 1;
399 snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen);
400 tot_len += 1 + thl->comlenlen + thl->comlen;
402 snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen);
403 snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen);
404 tot_len += 1 + thl->verlen + thl->verlenlen;
406 thl->seqlen = tot_len;
407 snmp_asn1_enc_length_cnt(thl->seqlen, &thl->seqlenlen);
408 tot_len += 1 + thl->seqlenlen;
414 * Sums varbind lengths from tail to head and
415 * annotates lengths in varbind for second encoding pass.
417 * @param root points to the root of the variable binding list
418 * @return the required lenght for encoding the variable bindings
421 snmp_varbind_list_sum(struct snmp_varbind_root *root)
423 struct snmp_varbind *vb;
432 /* encoded value lenght depends on type */
433 switch (vb->value_type)
435 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
436 sint_ptr = (s32_t*)vb->value;
437 snmp_asn1_enc_s32t_cnt(*sint_ptr, &vb->vlen);
439 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
440 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
441 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
442 uint_ptr = (u32_t*)vb->value;
443 snmp_asn1_enc_u32t_cnt(*uint_ptr, &vb->vlen);
445 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
446 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
447 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
448 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
449 vb->vlen = vb->value_len;
451 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
452 sint_ptr = (s32_t*)vb->value;
453 snmp_asn1_enc_oid_cnt(vb->value_len / sizeof(s32_t), sint_ptr, &vb->vlen);
456 /* unsupported type */
460 /* encoding length of value length field */
461 snmp_asn1_enc_length_cnt(vb->vlen, &vb->vlenlen);
462 snmp_asn1_enc_oid_cnt(vb->ident_len, vb->ident, &vb->olen);
463 snmp_asn1_enc_length_cnt(vb->olen, &vb->olenlen);
465 vb->seqlen = 1 + vb->vlenlen + vb->vlen;
466 vb->seqlen += 1 + vb->olenlen + vb->olen;
467 snmp_asn1_enc_length_cnt(vb->seqlen, &vb->seqlenlen);
470 tot_len += 1 + vb->seqlenlen + vb->seqlen;
475 /* varbind-list seq */
476 root->seqlen = tot_len;
477 snmp_asn1_enc_length_cnt(root->seqlen, &root->seqlenlen);
478 tot_len += 1 + root->seqlenlen;
484 * Encodes response header from head to tail.
487 snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p)
492 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
494 snmp_asn1_enc_length(p, ofs, m_stat->rhl.seqlen);
495 ofs += m_stat->rhl.seqlenlen;
497 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
499 snmp_asn1_enc_length(p, ofs, m_stat->rhl.verlen);
500 ofs += m_stat->rhl.verlenlen;
501 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.verlen, snmp_version);
502 ofs += m_stat->rhl.verlen;
504 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
506 snmp_asn1_enc_length(p, ofs, m_stat->rhl.comlen);
507 ofs += m_stat->rhl.comlenlen;
508 snmp_asn1_enc_raw(p, ofs, m_stat->rhl.comlen, m_stat->community);
509 ofs += m_stat->rhl.comlen;
511 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP));
513 snmp_asn1_enc_length(p, ofs, m_stat->rhl.pdulen);
514 ofs += m_stat->rhl.pdulenlen;
516 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
518 snmp_asn1_enc_length(p, ofs, m_stat->rhl.ridlen);
519 ofs += m_stat->rhl.ridlenlen;
520 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.ridlen, m_stat->rid);
521 ofs += m_stat->rhl.ridlen;
523 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
525 snmp_asn1_enc_length(p, ofs, m_stat->rhl.errstatlen);
526 ofs += m_stat->rhl.errstatlenlen;
527 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.errstatlen, m_stat->error_status);
528 ofs += m_stat->rhl.errstatlen;
530 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
532 snmp_asn1_enc_length(p, ofs, m_stat->rhl.erridxlen);
533 ofs += m_stat->rhl.erridxlenlen;
534 snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.erridxlen, m_stat->error_index);
535 ofs += m_stat->rhl.erridxlen;
541 * Encodes trap header from head to tail.
544 snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p)
549 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
551 snmp_asn1_enc_length(p, ofs, m_trap->thl.seqlen);
552 ofs += m_trap->thl.seqlenlen;
554 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
556 snmp_asn1_enc_length(p, ofs, m_trap->thl.verlen);
557 ofs += m_trap->thl.verlenlen;
558 snmp_asn1_enc_s32t(p, ofs, m_trap->thl.verlen, snmp_version);
559 ofs += m_trap->thl.verlen;
561 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
563 snmp_asn1_enc_length(p, ofs, m_trap->thl.comlen);
564 ofs += m_trap->thl.comlenlen;
565 snmp_asn1_enc_raw(p, ofs, m_trap->thl.comlen, (u8_t *)&snmp_publiccommunity[0]);
566 ofs += m_trap->thl.comlen;
568 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP));
570 snmp_asn1_enc_length(p, ofs, m_trap->thl.pdulen);
571 ofs += m_trap->thl.pdulenlen;
573 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
575 snmp_asn1_enc_length(p, ofs, m_trap->thl.eidlen);
576 ofs += m_trap->thl.eidlenlen;
577 snmp_asn1_enc_oid(p, ofs, m_trap->enterprise->len, &m_trap->enterprise->id[0]);
578 ofs += m_trap->thl.eidlen;
580 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR));
582 snmp_asn1_enc_length(p, ofs, m_trap->thl.aaddrlen);
583 ofs += m_trap->thl.aaddrlenlen;
584 snmp_asn1_enc_raw(p, ofs, m_trap->thl.aaddrlen, &m_trap->sip_raw[0]);
585 ofs += m_trap->thl.aaddrlen;
587 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
589 snmp_asn1_enc_length(p, ofs, m_trap->thl.gtrplen);
590 ofs += m_trap->thl.gtrplenlen;
591 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.gtrplen, m_trap->gen_trap);
592 ofs += m_trap->thl.gtrplen;
594 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
596 snmp_asn1_enc_length(p, ofs, m_trap->thl.strplen);
597 ofs += m_trap->thl.strplenlen;
598 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.strplen, m_trap->spc_trap);
599 ofs += m_trap->thl.strplen;
601 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS));
603 snmp_asn1_enc_length(p, ofs, m_trap->thl.tslen);
604 ofs += m_trap->thl.tslenlen;
605 snmp_asn1_enc_u32t(p, ofs, m_trap->thl.tslen, m_trap->ts);
606 ofs += m_trap->thl.tslen;
612 * Encodes varbind list from head to tail.
615 snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs)
617 struct snmp_varbind *vb;
622 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
624 snmp_asn1_enc_length(p, ofs, root->seqlen);
625 ofs += root->seqlenlen;
630 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
632 snmp_asn1_enc_length(p, ofs, vb->seqlen);
633 ofs += vb->seqlenlen;
635 snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
637 snmp_asn1_enc_length(p, ofs, vb->olen);
639 snmp_asn1_enc_oid(p, ofs, vb->ident_len, &vb->ident[0]);
642 snmp_asn1_enc_type(p, ofs, vb->value_type);
644 snmp_asn1_enc_length(p, ofs, vb->vlen);
647 switch (vb->value_type)
649 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
650 sint_ptr = (s32_t*)vb->value;
651 snmp_asn1_enc_s32t(p, ofs, vb->vlen, *sint_ptr);
653 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
654 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
655 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
656 uint_ptr = (u32_t*)vb->value;
657 snmp_asn1_enc_u32t(p, ofs, vb->vlen, *uint_ptr);
659 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
660 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
661 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
662 raw_ptr = (u8_t*)vb->value;
663 snmp_asn1_enc_raw(p, ofs, vb->vlen, raw_ptr);
665 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
667 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
668 sint_ptr = (s32_t*)vb->value;
669 snmp_asn1_enc_oid(p, ofs, vb->value_len / sizeof(s32_t), sint_ptr);
672 /* unsupported type */
681 #endif /* LWIP_SNMP */