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minix3/lib/liblwip/core/snmp/msg_out.c

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/**
* @file
* SNMP output message processing (RFC1157).
*
* Output responses and traps are build in two passes:
*
* Pass 0: iterate over the output message backwards to determine encoding lengths
* Pass 1: the actual forward encoding of internal form into ASN1
*
* The single-pass encoding method described by Comer & Stevens
* requires extra buffer space and copying for reversal of the packet.
* The buffer requirement can be prohibitively large for big payloads
* (>= 484) therefore we use the two encoding passes.
*/
/*
* 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>
*/
#include "lwip/opt.h"
#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
#include "lwip/udp.h"
#include "lwip/netif.h"
#include "lwip/snmp.h"
#include "lwip/snmp_asn1.h"
#include "lwip/snmp_msg.h"
struct snmp_trap_dst
{
/* destination IP address in network order */
ip_addr_t dip;
/* set to 0 when disabled, >0 when enabled */
u8_t enable;
};
struct snmp_trap_dst trap_dst[SNMP_TRAP_DESTINATIONS];
/** TRAP message structure */
struct snmp_msg_trap trap_msg;
static u16_t snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len);
static u16_t snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len);
static u16_t snmp_varbind_list_sum(struct snmp_varbind_root *root);
static u16_t snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p);
static u16_t snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p);
static u16_t snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs);
/**
* Sets enable switch for this trap destination.
* @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
* @param enable switch if 0 destination is disabled >0 enabled.
*/
void
snmp_trap_dst_enable(u8_t dst_idx, u8_t enable)
{
if (dst_idx < SNMP_TRAP_DESTINATIONS)
{
trap_dst[dst_idx].enable = enable;
}
}
/**
* Sets IPv4 address for this trap destination.
* @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
* @param dst IPv4 address in host order.
*/
void
snmp_trap_dst_ip_set(u8_t dst_idx, ip_addr_t *dst)
{
if (dst_idx < SNMP_TRAP_DESTINATIONS)
{
ip_addr_set(&trap_dst[dst_idx].dip, dst);
}
}
/**
* Sends a 'getresponse' message to the request originator.
*
* @param m_stat points to the current message request state source
* @return ERR_OK when success, ERR_MEM if we're out of memory
*
* @note the caller is responsible for filling in outvb in the m_stat
* and provide error-status and index (except for tooBig errors) ...
*/
err_t
snmp_send_response(struct snmp_msg_pstat *m_stat)
{
struct snmp_varbind_root emptyvb = {NULL, NULL, 0, 0, 0};
struct pbuf *p;
u16_t tot_len;
err_t err;
/* pass 0, calculate length fields */
tot_len = snmp_varbind_list_sum(&m_stat->outvb);
tot_len = snmp_resp_header_sum(m_stat, tot_len);
/* try allocating pbuf(s) for complete response */
p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
if (p == NULL)
{
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() tooBig\n"));
/* can't construct reply, return error-status tooBig */
m_stat->error_status = SNMP_ES_TOOBIG;
m_stat->error_index = 0;
/* pass 0, recalculate lengths, for empty varbind-list */
tot_len = snmp_varbind_list_sum(&emptyvb);
tot_len = snmp_resp_header_sum(m_stat, tot_len);
/* retry allocation once for header and empty varbind-list */
p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
}
if (p != NULL)
{
/* first pbuf alloc try or retry alloc success */
u16_t ofs;
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() p != NULL\n"));
/* pass 1, size error, encode packet ino the pbuf(s) */
ofs = snmp_resp_header_enc(m_stat, p);
snmp_varbind_list_enc(&m_stat->outvb, p, ofs);
switch (m_stat->error_status)
{
case SNMP_ES_TOOBIG:
snmp_inc_snmpouttoobigs();
break;
case SNMP_ES_NOSUCHNAME:
snmp_inc_snmpoutnosuchnames();
break;
case SNMP_ES_BADVALUE:
snmp_inc_snmpoutbadvalues();
break;
case SNMP_ES_GENERROR:
snmp_inc_snmpoutgenerrs();
break;
}
snmp_inc_snmpoutgetresponses();
snmp_inc_snmpoutpkts();
/** @todo do we need separate rx and tx pcbs for threaded case? */
/** connect to the originating source */
udp_connect(m_stat->pcb, &m_stat->sip, m_stat->sp);
err = udp_send(m_stat->pcb, p);
if (err == ERR_MEM)
{
/** @todo release some memory, retry and return tooBig? tooMuchHassle? */
err = ERR_MEM;
}
else
{
err = ERR_OK;
}
/** disassociate remote address and port with this pcb */
udp_disconnect(m_stat->pcb);
pbuf_free(p);
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() done\n"));
return err;
}
else
{
/* first pbuf alloc try or retry alloc failed
very low on memory, couldn't return tooBig */
return ERR_MEM;
}
}
/**
* Sends an generic or enterprise specific trap message.
*
* @param generic_trap is the trap code
* @param eoid points to enterprise object identifier
* @param specific_trap used for enterprise traps when generic_trap == 6
* @return ERR_OK when success, ERR_MEM if we're out of memory
*
* @note the caller is responsible for filling in outvb in the trap_msg
* @note the use of the enterpise identifier field
* is per RFC1215.
* Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps
* and .iso.org.dod.internet.private.enterprises.yourenterprise
* (sysObjectID) for specific traps.
*/
err_t
snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap)
{
struct snmp_trap_dst *td;
struct netif *dst_if;
ip_addr_t dst_ip;
struct pbuf *p;
u16_t i,tot_len;
err_t err = ERR_OK;
for (i=0, td = &trap_dst[0]; i<SNMP_TRAP_DESTINATIONS; i++, td++)
{
if ((td->enable != 0) && !ip_addr_isany(&td->dip))
{
/* network order trap destination */
ip_addr_copy(trap_msg.dip, td->dip);
/* lookup current source address for this dst */
dst_if = ip_route(&td->dip);
if (dst_if != NULL) {
ip_addr_copy(dst_ip, dst_if->ip_addr);
/* @todo: what about IPv6? */
trap_msg.sip_raw[0] = ip4_addr1(&dst_ip);
trap_msg.sip_raw[1] = ip4_addr2(&dst_ip);
trap_msg.sip_raw[2] = ip4_addr3(&dst_ip);
trap_msg.sip_raw[3] = ip4_addr4(&dst_ip);
trap_msg.gen_trap = generic_trap;
trap_msg.spc_trap = specific_trap;
if (generic_trap == SNMP_GENTRAP_ENTERPRISESPC)
{
/* enterprise-Specific trap */
trap_msg.enterprise = eoid;
}
else
{
/* generic (MIB-II) trap */
snmp_get_snmpgrpid_ptr(&trap_msg.enterprise);
}
snmp_get_sysuptime(&trap_msg.ts);
/* pass 0, calculate length fields */
tot_len = snmp_varbind_list_sum(&trap_msg.outvb);
tot_len = snmp_trap_header_sum(&trap_msg, tot_len);
/* allocate pbuf(s) */
p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
if (p != NULL)
{
u16_t ofs;
/* pass 1, encode packet ino the pbuf(s) */
ofs = snmp_trap_header_enc(&trap_msg, p);
snmp_varbind_list_enc(&trap_msg.outvb, p, ofs);
snmp_inc_snmpouttraps();
snmp_inc_snmpoutpkts();
/** send to the TRAP destination */
udp_sendto(trap_msg.pcb, p, &trap_msg.dip, SNMP_TRAP_PORT);
pbuf_free(p);
} else {
err = ERR_MEM;
}
} else {
/* routing error */
err = ERR_RTE;
}
}
}
return err;
}
void
snmp_coldstart_trap(void)
{
trap_msg.outvb.head = NULL;
trap_msg.outvb.tail = NULL;
trap_msg.outvb.count = 0;
snmp_send_trap(SNMP_GENTRAP_COLDSTART, NULL, 0);
}
void
snmp_authfail_trap(void)
{
u8_t enable;
snmp_get_snmpenableauthentraps(&enable);
if (enable == 1)
{
trap_msg.outvb.head = NULL;
trap_msg.outvb.tail = NULL;
trap_msg.outvb.count = 0;
snmp_send_trap(SNMP_GENTRAP_AUTHFAIL, NULL, 0);
}
}
/**
* Sums response header field lengths from tail to head and
* returns resp_header_lengths for second encoding pass.
*
* @param vb_len varbind-list length
* @param rhl points to returned header lengths
* @return the required lenght for encoding the response header
*/
static u16_t
snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len)
{
u16_t tot_len;
struct snmp_resp_header_lengths *rhl;
rhl = &m_stat->rhl;
tot_len = vb_len;
snmp_asn1_enc_s32t_cnt(m_stat->error_index, &rhl->erridxlen);
snmp_asn1_enc_length_cnt(rhl->erridxlen, &rhl->erridxlenlen);
tot_len += 1 + rhl->erridxlenlen + rhl->erridxlen;
snmp_asn1_enc_s32t_cnt(m_stat->error_status, &rhl->errstatlen);
snmp_asn1_enc_length_cnt(rhl->errstatlen, &rhl->errstatlenlen);
tot_len += 1 + rhl->errstatlenlen + rhl->errstatlen;
snmp_asn1_enc_s32t_cnt(m_stat->rid, &rhl->ridlen);
snmp_asn1_enc_length_cnt(rhl->ridlen, &rhl->ridlenlen);
tot_len += 1 + rhl->ridlenlen + rhl->ridlen;
rhl->pdulen = tot_len;
snmp_asn1_enc_length_cnt(rhl->pdulen, &rhl->pdulenlen);
tot_len += 1 + rhl->pdulenlen;
rhl->comlen = m_stat->com_strlen;
snmp_asn1_enc_length_cnt(rhl->comlen, &rhl->comlenlen);
tot_len += 1 + rhl->comlenlen + rhl->comlen;
snmp_asn1_enc_s32t_cnt(snmp_version, &rhl->verlen);
snmp_asn1_enc_length_cnt(rhl->verlen, &rhl->verlenlen);
tot_len += 1 + rhl->verlen + rhl->verlenlen;
rhl->seqlen = tot_len;
snmp_asn1_enc_length_cnt(rhl->seqlen, &rhl->seqlenlen);
tot_len += 1 + rhl->seqlenlen;
return tot_len;
}
/**
* Sums trap header field lengths from tail to head and
* returns trap_header_lengths for second encoding pass.
*
* @param vb_len varbind-list length
* @param thl points to returned header lengths
* @return the required lenght for encoding the trap header
*/
static u16_t
snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len)
{
u16_t tot_len;
struct snmp_trap_header_lengths *thl;
thl = &m_trap->thl;
tot_len = vb_len;
snmp_asn1_enc_u32t_cnt(m_trap->ts, &thl->tslen);
snmp_asn1_enc_length_cnt(thl->tslen, &thl->tslenlen);
tot_len += 1 + thl->tslen + thl->tslenlen;
snmp_asn1_enc_s32t_cnt(m_trap->spc_trap, &thl->strplen);
snmp_asn1_enc_length_cnt(thl->strplen, &thl->strplenlen);
tot_len += 1 + thl->strplen + thl->strplenlen;
snmp_asn1_enc_s32t_cnt(m_trap->gen_trap, &thl->gtrplen);
snmp_asn1_enc_length_cnt(thl->gtrplen, &thl->gtrplenlen);
tot_len += 1 + thl->gtrplen + thl->gtrplenlen;
thl->aaddrlen = 4;
snmp_asn1_enc_length_cnt(thl->aaddrlen, &thl->aaddrlenlen);
tot_len += 1 + thl->aaddrlen + thl->aaddrlenlen;
snmp_asn1_enc_oid_cnt(m_trap->enterprise->len, &m_trap->enterprise->id[0], &thl->eidlen);
snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen);
tot_len += 1 + thl->eidlen + thl->eidlenlen;
thl->pdulen = tot_len;
snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen);
tot_len += 1 + thl->pdulenlen;
thl->comlen = sizeof(snmp_publiccommunity) - 1;
snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen);
tot_len += 1 + thl->comlenlen + thl->comlen;
snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen);
snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen);
tot_len += 1 + thl->verlen + thl->verlenlen;
thl->seqlen = tot_len;
snmp_asn1_enc_length_cnt(thl->seqlen, &thl->seqlenlen);
tot_len += 1 + thl->seqlenlen;
return tot_len;
}
/**
* Sums varbind lengths from tail to head and
* annotates lengths in varbind for second encoding pass.
*
* @param root points to the root of the variable binding list
* @return the required lenght for encoding the variable bindings
*/
static u16_t
snmp_varbind_list_sum(struct snmp_varbind_root *root)
{
struct snmp_varbind *vb;
u32_t *uint_ptr;
s32_t *sint_ptr;
u16_t tot_len;
tot_len = 0;
vb = root->tail;
while ( vb != NULL )
{
/* encoded value lenght depends on type */
switch (vb->value_type)
{
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
sint_ptr = (s32_t*)vb->value;
snmp_asn1_enc_s32t_cnt(*sint_ptr, &vb->vlen);
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_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 */
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