681 lines
22 KiB
C
681 lines
22 KiB
C
/**
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* @file
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* SNMP output message processing (RFC1157).
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*
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* Output responses and traps are build in two passes:
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*
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* Pass 0: iterate over the output message backwards to determine encoding lengths
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* Pass 1: the actual forward encoding of internal form into ASN1
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*
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* The single-pass encoding method described by Comer & Stevens
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* requires extra buffer space and copying for reversal of the packet.
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* The buffer requirement can be prohibitively large for big payloads
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* (>= 484) therefore we use the two encoding passes.
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*/
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/*
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* Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Christiaan Simons <christiaan.simons@axon.tv>
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*/
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#include "lwip/opt.h"
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#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/udp.h"
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#include "lwip/netif.h"
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#include "lwip/snmp.h"
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#include "lwip/snmp_asn1.h"
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#include "lwip/snmp_msg.h"
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struct snmp_trap_dst
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{
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/* destination IP address in network order */
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ip_addr_t dip;
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/* set to 0 when disabled, >0 when enabled */
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u8_t enable;
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};
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struct snmp_trap_dst trap_dst[SNMP_TRAP_DESTINATIONS];
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/** TRAP message structure */
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struct snmp_msg_trap trap_msg;
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static u16_t snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len);
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static u16_t snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len);
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static u16_t snmp_varbind_list_sum(struct snmp_varbind_root *root);
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static u16_t snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p);
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static u16_t snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p);
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static u16_t snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs);
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/**
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* Sets enable switch for this trap destination.
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* @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
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* @param enable switch if 0 destination is disabled >0 enabled.
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*/
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void
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snmp_trap_dst_enable(u8_t dst_idx, u8_t enable)
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{
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if (dst_idx < SNMP_TRAP_DESTINATIONS)
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{
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trap_dst[dst_idx].enable = enable;
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}
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}
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/**
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* Sets IPv4 address for this trap destination.
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* @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
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* @param dst IPv4 address in host order.
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*/
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void
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snmp_trap_dst_ip_set(u8_t dst_idx, ip_addr_t *dst)
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{
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if (dst_idx < SNMP_TRAP_DESTINATIONS)
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{
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ip_addr_set(&trap_dst[dst_idx].dip, dst);
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}
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}
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/**
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* Sends a 'getresponse' message to the request originator.
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*
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* @param m_stat points to the current message request state source
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* @return ERR_OK when success, ERR_MEM if we're out of memory
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*
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* @note the caller is responsible for filling in outvb in the m_stat
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* and provide error-status and index (except for tooBig errors) ...
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*/
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err_t
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snmp_send_response(struct snmp_msg_pstat *m_stat)
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{
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struct snmp_varbind_root emptyvb = {NULL, NULL, 0, 0, 0};
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struct pbuf *p;
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u16_t tot_len;
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err_t err;
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/* pass 0, calculate length fields */
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tot_len = snmp_varbind_list_sum(&m_stat->outvb);
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tot_len = snmp_resp_header_sum(m_stat, tot_len);
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/* try allocating pbuf(s) for complete response */
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p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
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if (p == NULL)
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{
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() tooBig\n"));
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/* can't construct reply, return error-status tooBig */
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m_stat->error_status = SNMP_ES_TOOBIG;
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m_stat->error_index = 0;
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/* pass 0, recalculate lengths, for empty varbind-list */
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tot_len = snmp_varbind_list_sum(&emptyvb);
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tot_len = snmp_resp_header_sum(m_stat, tot_len);
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/* retry allocation once for header and empty varbind-list */
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p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
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}
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if (p != NULL)
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{
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/* first pbuf alloc try or retry alloc success */
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u16_t ofs;
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() p != NULL\n"));
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/* pass 1, size error, encode packet ino the pbuf(s) */
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ofs = snmp_resp_header_enc(m_stat, p);
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if (m_stat->error_status == SNMP_ES_TOOBIG)
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{
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snmp_varbind_list_enc(&emptyvb, p, ofs);
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}
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else
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{
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snmp_varbind_list_enc(&m_stat->outvb, p, ofs);
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}
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switch (m_stat->error_status)
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{
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case SNMP_ES_TOOBIG:
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snmp_inc_snmpouttoobigs();
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break;
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case SNMP_ES_NOSUCHNAME:
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snmp_inc_snmpoutnosuchnames();
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break;
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case SNMP_ES_BADVALUE:
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snmp_inc_snmpoutbadvalues();
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break;
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case SNMP_ES_GENERROR:
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snmp_inc_snmpoutgenerrs();
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break;
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}
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snmp_inc_snmpoutgetresponses();
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snmp_inc_snmpoutpkts();
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/** @todo do we need separate rx and tx pcbs for threaded case? */
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/** connect to the originating source */
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udp_connect(m_stat->pcb, &m_stat->sip, m_stat->sp);
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err = udp_send(m_stat->pcb, p);
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if (err == ERR_MEM)
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{
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/** @todo release some memory, retry and return tooBig? tooMuchHassle? */
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err = ERR_MEM;
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}
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else
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{
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err = ERR_OK;
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}
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/** disassociate remote address and port with this pcb */
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udp_disconnect(m_stat->pcb);
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pbuf_free(p);
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() done\n"));
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return err;
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}
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else
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{
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/* first pbuf alloc try or retry alloc failed
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very low on memory, couldn't return tooBig */
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return ERR_MEM;
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}
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}
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/**
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* Sends an generic or enterprise specific trap message.
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*
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* @param generic_trap is the trap code
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* @param eoid points to enterprise object identifier
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* @param specific_trap used for enterprise traps when generic_trap == 6
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* @return ERR_OK when success, ERR_MEM if we're out of memory
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*
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* @note the caller is responsible for filling in outvb in the trap_msg
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* @note the use of the enterpise identifier field
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* is per RFC1215.
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* Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps
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* and .iso.org.dod.internet.private.enterprises.yourenterprise
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* (sysObjectID) for specific traps.
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*/
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err_t
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snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap)
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{
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struct snmp_trap_dst *td;
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struct netif *dst_if;
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ip_addr_t dst_ip;
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struct pbuf *p;
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u16_t i,tot_len;
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for (i=0, td = &trap_dst[0]; i<SNMP_TRAP_DESTINATIONS; i++, td++)
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{
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if ((td->enable != 0) && !ip_addr_isany(&td->dip))
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{
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/* network order trap destination */
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ip_addr_copy(trap_msg.dip, td->dip);
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/* lookup current source address for this dst */
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dst_if = ip_route(&td->dip);
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ip_addr_copy(dst_ip, dst_if->ip_addr);
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/* @todo: what about IPv6? */
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trap_msg.sip_raw[0] = ip4_addr1(&dst_ip);
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trap_msg.sip_raw[1] = ip4_addr2(&dst_ip);
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trap_msg.sip_raw[2] = ip4_addr3(&dst_ip);
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trap_msg.sip_raw[3] = ip4_addr4(&dst_ip);
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trap_msg.gen_trap = generic_trap;
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trap_msg.spc_trap = specific_trap;
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if (generic_trap == SNMP_GENTRAP_ENTERPRISESPC)
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{
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/* enterprise-Specific trap */
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trap_msg.enterprise = eoid;
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}
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else
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{
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/* generic (MIB-II) trap */
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snmp_get_snmpgrpid_ptr(&trap_msg.enterprise);
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}
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snmp_get_sysuptime(&trap_msg.ts);
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/* pass 0, calculate length fields */
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tot_len = snmp_varbind_list_sum(&trap_msg.outvb);
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tot_len = snmp_trap_header_sum(&trap_msg, tot_len);
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/* allocate pbuf(s) */
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p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
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if (p != NULL)
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{
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u16_t ofs;
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/* pass 1, encode packet ino the pbuf(s) */
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ofs = snmp_trap_header_enc(&trap_msg, p);
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snmp_varbind_list_enc(&trap_msg.outvb, p, ofs);
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snmp_inc_snmpouttraps();
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snmp_inc_snmpoutpkts();
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/** send to the TRAP destination */
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udp_sendto(trap_msg.pcb, p, &trap_msg.dip, SNMP_TRAP_PORT);
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pbuf_free(p);
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}
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else
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{
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return ERR_MEM;
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}
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}
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}
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return ERR_OK;
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}
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void
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snmp_coldstart_trap(void)
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{
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trap_msg.outvb.head = NULL;
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trap_msg.outvb.tail = NULL;
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trap_msg.outvb.count = 0;
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snmp_send_trap(SNMP_GENTRAP_COLDSTART, NULL, 0);
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}
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void
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snmp_authfail_trap(void)
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{
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u8_t enable;
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snmp_get_snmpenableauthentraps(&enable);
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if (enable == 1)
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{
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trap_msg.outvb.head = NULL;
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trap_msg.outvb.tail = NULL;
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trap_msg.outvb.count = 0;
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snmp_send_trap(SNMP_GENTRAP_AUTHFAIL, NULL, 0);
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}
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}
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/**
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* Sums response header field lengths from tail to head and
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* returns resp_header_lengths for second encoding pass.
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*
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* @param vb_len varbind-list length
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* @param rhl points to returned header lengths
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* @return the required lenght for encoding the response header
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*/
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static u16_t
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snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len)
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{
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u16_t tot_len;
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struct snmp_resp_header_lengths *rhl;
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rhl = &m_stat->rhl;
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tot_len = vb_len;
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snmp_asn1_enc_s32t_cnt(m_stat->error_index, &rhl->erridxlen);
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snmp_asn1_enc_length_cnt(rhl->erridxlen, &rhl->erridxlenlen);
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tot_len += 1 + rhl->erridxlenlen + rhl->erridxlen;
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snmp_asn1_enc_s32t_cnt(m_stat->error_status, &rhl->errstatlen);
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snmp_asn1_enc_length_cnt(rhl->errstatlen, &rhl->errstatlenlen);
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tot_len += 1 + rhl->errstatlenlen + rhl->errstatlen;
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snmp_asn1_enc_s32t_cnt(m_stat->rid, &rhl->ridlen);
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snmp_asn1_enc_length_cnt(rhl->ridlen, &rhl->ridlenlen);
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tot_len += 1 + rhl->ridlenlen + rhl->ridlen;
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rhl->pdulen = tot_len;
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snmp_asn1_enc_length_cnt(rhl->pdulen, &rhl->pdulenlen);
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tot_len += 1 + rhl->pdulenlen;
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rhl->comlen = m_stat->com_strlen;
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snmp_asn1_enc_length_cnt(rhl->comlen, &rhl->comlenlen);
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tot_len += 1 + rhl->comlenlen + rhl->comlen;
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snmp_asn1_enc_s32t_cnt(snmp_version, &rhl->verlen);
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snmp_asn1_enc_length_cnt(rhl->verlen, &rhl->verlenlen);
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tot_len += 1 + rhl->verlen + rhl->verlenlen;
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rhl->seqlen = tot_len;
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snmp_asn1_enc_length_cnt(rhl->seqlen, &rhl->seqlenlen);
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tot_len += 1 + rhl->seqlenlen;
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return tot_len;
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}
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/**
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* Sums trap header field lengths from tail to head and
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* returns trap_header_lengths for second encoding pass.
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*
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* @param vb_len varbind-list length
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* @param thl points to returned header lengths
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* @return the required lenght for encoding the trap header
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*/
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static u16_t
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snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len)
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{
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u16_t tot_len;
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struct snmp_trap_header_lengths *thl;
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thl = &m_trap->thl;
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tot_len = vb_len;
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snmp_asn1_enc_u32t_cnt(m_trap->ts, &thl->tslen);
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snmp_asn1_enc_length_cnt(thl->tslen, &thl->tslenlen);
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tot_len += 1 + thl->tslen + thl->tslenlen;
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snmp_asn1_enc_s32t_cnt(m_trap->spc_trap, &thl->strplen);
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snmp_asn1_enc_length_cnt(thl->strplen, &thl->strplenlen);
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tot_len += 1 + thl->strplen + thl->strplenlen;
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snmp_asn1_enc_s32t_cnt(m_trap->gen_trap, &thl->gtrplen);
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snmp_asn1_enc_length_cnt(thl->gtrplen, &thl->gtrplenlen);
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tot_len += 1 + thl->gtrplen + thl->gtrplenlen;
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thl->aaddrlen = 4;
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snmp_asn1_enc_length_cnt(thl->aaddrlen, &thl->aaddrlenlen);
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tot_len += 1 + thl->aaddrlen + thl->aaddrlenlen;
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snmp_asn1_enc_oid_cnt(m_trap->enterprise->len, &m_trap->enterprise->id[0], &thl->eidlen);
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snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen);
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tot_len += 1 + thl->eidlen + thl->eidlenlen;
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thl->pdulen = tot_len;
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snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen);
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tot_len += 1 + thl->pdulenlen;
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thl->comlen = sizeof(snmp_publiccommunity) - 1;
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snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen);
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tot_len += 1 + thl->comlenlen + thl->comlen;
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snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen);
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snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen);
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tot_len += 1 + thl->verlen + thl->verlenlen;
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thl->seqlen = tot_len;
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snmp_asn1_enc_length_cnt(thl->seqlen, &thl->seqlenlen);
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tot_len += 1 + thl->seqlenlen;
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return tot_len;
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}
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/**
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* Sums varbind lengths from tail to head and
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* annotates lengths in varbind for second encoding pass.
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*
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* @param root points to the root of the variable binding list
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* @return the required lenght for encoding the variable bindings
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*/
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static u16_t
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snmp_varbind_list_sum(struct snmp_varbind_root *root)
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{
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struct snmp_varbind *vb;
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u32_t *uint_ptr;
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s32_t *sint_ptr;
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u16_t tot_len;
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tot_len = 0;
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vb = root->tail;
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while ( vb != NULL )
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{
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/* encoded value lenght depends on type */
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switch (vb->value_type)
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{
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case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
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sint_ptr = (s32_t*)vb->value;
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snmp_asn1_enc_s32t_cnt(*sint_ptr, &vb->vlen);
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break;
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case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
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case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
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case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
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uint_ptr = (u32_t*)vb->value;
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snmp_asn1_enc_u32t_cnt(*uint_ptr, &vb->vlen);
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
|
|
vb->vlen = vb->value_len;
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
|
|
sint_ptr = (s32_t*)vb->value;
|
|
snmp_asn1_enc_oid_cnt(vb->value_len / sizeof(s32_t), sint_ptr, &vb->vlen);
|
|
break;
|
|
default:
|
|
/* unsupported type */
|
|
vb->vlen = 0;
|
|
break;
|
|
};
|
|
/* encoding length of value length field */
|
|
snmp_asn1_enc_length_cnt(vb->vlen, &vb->vlenlen);
|
|
snmp_asn1_enc_oid_cnt(vb->ident_len, vb->ident, &vb->olen);
|
|
snmp_asn1_enc_length_cnt(vb->olen, &vb->olenlen);
|
|
|
|
vb->seqlen = 1 + vb->vlenlen + vb->vlen;
|
|
vb->seqlen += 1 + vb->olenlen + vb->olen;
|
|
snmp_asn1_enc_length_cnt(vb->seqlen, &vb->seqlenlen);
|
|
|
|
/* varbind seq */
|
|
tot_len += 1 + vb->seqlenlen + vb->seqlen;
|
|
|
|
vb = vb->prev;
|
|
}
|
|
|
|
/* varbind-list seq */
|
|
root->seqlen = tot_len;
|
|
snmp_asn1_enc_length_cnt(root->seqlen, &root->seqlenlen);
|
|
tot_len += 1 + root->seqlenlen;
|
|
|
|
return tot_len;
|
|
}
|
|
|
|
/**
|
|
* Encodes response header from head to tail.
|
|
*/
|
|
static u16_t
|
|
snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p)
|
|
{
|
|
u16_t ofs;
|
|
|
|
ofs = 0;
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_stat->rhl.seqlen);
|
|
ofs += m_stat->rhl.seqlenlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_stat->rhl.verlen);
|
|
ofs += m_stat->rhl.verlenlen;
|
|
snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.verlen, snmp_version);
|
|
ofs += m_stat->rhl.verlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_stat->rhl.comlen);
|
|
ofs += m_stat->rhl.comlenlen;
|
|
snmp_asn1_enc_raw(p, ofs, m_stat->rhl.comlen, m_stat->community);
|
|
ofs += m_stat->rhl.comlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_stat->rhl.pdulen);
|
|
ofs += m_stat->rhl.pdulenlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_stat->rhl.ridlen);
|
|
ofs += m_stat->rhl.ridlenlen;
|
|
snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.ridlen, m_stat->rid);
|
|
ofs += m_stat->rhl.ridlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_stat->rhl.errstatlen);
|
|
ofs += m_stat->rhl.errstatlenlen;
|
|
snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.errstatlen, m_stat->error_status);
|
|
ofs += m_stat->rhl.errstatlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_stat->rhl.erridxlen);
|
|
ofs += m_stat->rhl.erridxlenlen;
|
|
snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.erridxlen, m_stat->error_index);
|
|
ofs += m_stat->rhl.erridxlen;
|
|
|
|
return ofs;
|
|
}
|
|
|
|
/**
|
|
* Encodes trap header from head to tail.
|
|
*/
|
|
static u16_t
|
|
snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p)
|
|
{
|
|
u16_t ofs;
|
|
|
|
ofs = 0;
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.seqlen);
|
|
ofs += m_trap->thl.seqlenlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.verlen);
|
|
ofs += m_trap->thl.verlenlen;
|
|
snmp_asn1_enc_s32t(p, ofs, m_trap->thl.verlen, snmp_version);
|
|
ofs += m_trap->thl.verlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.comlen);
|
|
ofs += m_trap->thl.comlenlen;
|
|
snmp_asn1_enc_raw(p, ofs, m_trap->thl.comlen, (u8_t *)&snmp_publiccommunity[0]);
|
|
ofs += m_trap->thl.comlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.pdulen);
|
|
ofs += m_trap->thl.pdulenlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.eidlen);
|
|
ofs += m_trap->thl.eidlenlen;
|
|
snmp_asn1_enc_oid(p, ofs, m_trap->enterprise->len, &m_trap->enterprise->id[0]);
|
|
ofs += m_trap->thl.eidlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.aaddrlen);
|
|
ofs += m_trap->thl.aaddrlenlen;
|
|
snmp_asn1_enc_raw(p, ofs, m_trap->thl.aaddrlen, &m_trap->sip_raw[0]);
|
|
ofs += m_trap->thl.aaddrlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.gtrplen);
|
|
ofs += m_trap->thl.gtrplenlen;
|
|
snmp_asn1_enc_u32t(p, ofs, m_trap->thl.gtrplen, m_trap->gen_trap);
|
|
ofs += m_trap->thl.gtrplen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.strplen);
|
|
ofs += m_trap->thl.strplenlen;
|
|
snmp_asn1_enc_u32t(p, ofs, m_trap->thl.strplen, m_trap->spc_trap);
|
|
ofs += m_trap->thl.strplen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, m_trap->thl.tslen);
|
|
ofs += m_trap->thl.tslenlen;
|
|
snmp_asn1_enc_u32t(p, ofs, m_trap->thl.tslen, m_trap->ts);
|
|
ofs += m_trap->thl.tslen;
|
|
|
|
return ofs;
|
|
}
|
|
|
|
/**
|
|
* Encodes varbind list from head to tail.
|
|
*/
|
|
static u16_t
|
|
snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs)
|
|
{
|
|
struct snmp_varbind *vb;
|
|
s32_t *sint_ptr;
|
|
u32_t *uint_ptr;
|
|
u8_t *raw_ptr;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, root->seqlen);
|
|
ofs += root->seqlenlen;
|
|
|
|
vb = root->head;
|
|
while ( vb != NULL )
|
|
{
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, vb->seqlen);
|
|
ofs += vb->seqlenlen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, vb->olen);
|
|
ofs += vb->olenlen;
|
|
snmp_asn1_enc_oid(p, ofs, vb->ident_len, &vb->ident[0]);
|
|
ofs += vb->olen;
|
|
|
|
snmp_asn1_enc_type(p, ofs, vb->value_type);
|
|
ofs += 1;
|
|
snmp_asn1_enc_length(p, ofs, vb->vlen);
|
|
ofs += vb->vlenlen;
|
|
|
|
switch (vb->value_type)
|
|
{
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
|
|
sint_ptr = (s32_t*)vb->value;
|
|
snmp_asn1_enc_s32t(p, ofs, vb->vlen, *sint_ptr);
|
|
break;
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
|
|
uint_ptr = (u32_t*)vb->value;
|
|
snmp_asn1_enc_u32t(p, ofs, vb->vlen, *uint_ptr);
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
|
|
raw_ptr = (u8_t*)vb->value;
|
|
snmp_asn1_enc_raw(p, ofs, vb->vlen, raw_ptr);
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
|
|
sint_ptr = (s32_t*)vb->value;
|
|
snmp_asn1_enc_oid(p, ofs, vb->value_len / sizeof(s32_t), sint_ptr);
|
|
break;
|
|
default:
|
|
/* unsupported type */
|
|
break;
|
|
};
|
|
ofs += vb->vlen;
|
|
vb = vb->next;
|
|
}
|
|
return ofs;
|
|
}
|
|
|
|
#endif /* LWIP_SNMP */
|