1438 lines
42 KiB
C
1438 lines
42 KiB
C
/**
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* @file
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* SNMP input message processing (RFC1157).
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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/snmp.h"
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#include "lwip/snmp_asn1.h"
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#include "lwip/snmp_msg.h"
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#include "lwip/snmp_structs.h"
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#include "lwip/ip_addr.h"
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#include "lwip/memp.h"
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#include "lwip/udp.h"
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#include "lwip/stats.h"
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#include <string.h>
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/* public (non-static) constants */
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/** SNMP v1 == 0 */
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const s32_t snmp_version = 0;
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/** default SNMP community string */
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const char snmp_publiccommunity[7] = "public";
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/* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
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struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
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/* UDP Protocol Control Block */
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struct udp_pcb *snmp1_pcb;
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static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
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static err_t snmp_pdu_header_check(struct pbuf *p, u16_t ofs, u16_t pdu_len, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
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static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
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/**
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* Starts SNMP Agent.
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* Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
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*/
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void
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snmp_init(void)
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{
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struct snmp_msg_pstat *msg_ps;
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u8_t i;
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snmp1_pcb = udp_new();
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if (snmp1_pcb != NULL)
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{
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udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
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udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
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}
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msg_ps = &msg_input_list[0];
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for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
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{
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msg_ps->state = SNMP_MSG_EMPTY;
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msg_ps->error_index = 0;
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msg_ps->error_status = SNMP_ES_NOERROR;
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msg_ps++;
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}
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trap_msg.pcb = snmp1_pcb;
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#ifdef SNMP_PRIVATE_MIB_INIT
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/* If defined, rhis must be a function-like define to initialize the
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* private MIB after the stack has been initialized.
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* The private MIB can also be initialized in tcpip_callback (or after
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* the stack is initialized), this define is only for convenience. */
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SNMP_PRIVATE_MIB_INIT();
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#endif /* SNMP_PRIVATE_MIB_INIT */
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/* The coldstart trap will only be output
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if our outgoing interface is up & configured */
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snmp_coldstart_trap();
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}
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static void
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snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
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{
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snmp_varbind_list_free(&msg_ps->outvb);
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msg_ps->outvb = msg_ps->invb;
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msg_ps->invb.head = NULL;
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msg_ps->invb.tail = NULL;
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msg_ps->invb.count = 0;
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msg_ps->error_status = error;
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msg_ps->error_index = 1 + msg_ps->vb_idx;
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snmp_send_response(msg_ps);
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snmp_varbind_list_free(&msg_ps->outvb);
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msg_ps->state = SNMP_MSG_EMPTY;
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}
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static void
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snmp_ok_response(struct snmp_msg_pstat *msg_ps)
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{
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err_t err_ret;
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err_ret = snmp_send_response(msg_ps);
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if (err_ret == ERR_MEM)
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{
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/* serious memory problem, can't return tooBig */
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}
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else
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{
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
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}
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/* free varbinds (if available) */
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snmp_varbind_list_free(&msg_ps->invb);
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snmp_varbind_list_free(&msg_ps->outvb);
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msg_ps->state = SNMP_MSG_EMPTY;
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}
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/**
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* Service an internal or external event for SNMP GET.
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*
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* @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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* @param msg_ps points to the assosicated message process state
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*/
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static void
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snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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{
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
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if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
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{
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struct mib_external_node *en;
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struct snmp_name_ptr np;
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/* get_object_def() answer*/
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en = msg_ps->ext_mib_node;
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np = msg_ps->ext_name_ptr;
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/* translate answer into a known lifeform */
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en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
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if ((msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) &&
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(msg_ps->ext_object_def.access & MIB_ACCESS_READ))
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{
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msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
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en->get_value_q(request_id, &msg_ps->ext_object_def);
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}
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else
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{
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en->get_object_def_pc(request_id, np.ident_len, np.ident);
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/* search failed, object id points to unknown object (nosuchname) */
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snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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}
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}
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else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
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{
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struct mib_external_node *en;
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struct snmp_varbind *vb;
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/* get_value() answer */
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en = msg_ps->ext_mib_node;
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/* allocate output varbind */
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vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
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LWIP_ASSERT("vb != NULL",vb != NULL);
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if (vb != NULL)
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{
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vb->next = NULL;
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vb->prev = NULL;
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/* move name from invb to outvb */
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vb->ident = msg_ps->vb_ptr->ident;
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vb->ident_len = msg_ps->vb_ptr->ident_len;
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/* ensure this memory is refereced once only */
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msg_ps->vb_ptr->ident = NULL;
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msg_ps->vb_ptr->ident_len = 0;
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vb->value_type = msg_ps->ext_object_def.asn_type;
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LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
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vb->value_len = (u8_t)msg_ps->ext_object_def.v_len;
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if (vb->value_len > 0)
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{
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LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
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vb->value = memp_malloc(MEMP_SNMP_VALUE);
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LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
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if (vb->value != NULL)
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{
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en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
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snmp_varbind_tail_add(&msg_ps->outvb, vb);
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/* search again (if vb_idx < msg_ps->invb.count) */
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msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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msg_ps->vb_idx += 1;
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}
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else
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{
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en->get_value_pc(request_id, &msg_ps->ext_object_def);
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
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msg_ps->vb_ptr->ident = vb->ident;
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msg_ps->vb_ptr->ident_len = vb->ident_len;
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memp_free(MEMP_SNMP_VARBIND, vb);
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snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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}
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}
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else
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{
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/* vb->value_len == 0, empty value (e.g. empty string) */
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en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
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vb->value = NULL;
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snmp_varbind_tail_add(&msg_ps->outvb, vb);
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/* search again (if vb_idx < msg_ps->invb.count) */
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msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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msg_ps->vb_idx += 1;
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}
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}
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else
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{
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en->get_value_pc(request_id, &msg_ps->ext_object_def);
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
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snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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}
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}
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while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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(msg_ps->vb_idx < msg_ps->invb.count))
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{
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struct mib_node *mn;
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struct snmp_name_ptr np;
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if (msg_ps->vb_idx == 0)
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{
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msg_ps->vb_ptr = msg_ps->invb.head;
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}
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else
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{
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msg_ps->vb_ptr = msg_ps->vb_ptr->next;
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}
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/** test object identifier for .iso.org.dod.internet prefix */
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if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
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{
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mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
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msg_ps->vb_ptr->ident + 4, &np);
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if (mn != NULL)
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{
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if (mn->node_type == MIB_NODE_EX)
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{
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/* external object */
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struct mib_external_node *en = (struct mib_external_node*)mn;
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msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
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/* save en && args in msg_ps!! */
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msg_ps->ext_mib_node = en;
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msg_ps->ext_name_ptr = np;
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en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
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}
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else
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{
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/* internal object */
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struct obj_def object_def;
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msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
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mn->get_object_def(np.ident_len, np.ident, &object_def);
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if ((object_def.instance != MIB_OBJECT_NONE) &&
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(object_def.access & MIB_ACCESS_READ))
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{
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mn = mn;
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}
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else
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{
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/* search failed, object id points to unknown object (nosuchname) */
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mn = NULL;
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}
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if (mn != NULL)
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{
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struct snmp_varbind *vb;
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msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
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/* allocate output varbind */
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vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
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LWIP_ASSERT("vb != NULL",vb != NULL);
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if (vb != NULL)
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{
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vb->next = NULL;
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vb->prev = NULL;
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/* move name from invb to outvb */
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vb->ident = msg_ps->vb_ptr->ident;
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vb->ident_len = msg_ps->vb_ptr->ident_len;
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/* ensure this memory is refereced once only */
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msg_ps->vb_ptr->ident = NULL;
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msg_ps->vb_ptr->ident_len = 0;
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vb->value_type = object_def.asn_type;
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LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
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vb->value_len = (u8_t)object_def.v_len;
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if (vb->value_len > 0)
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{
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LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low",
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vb->value_len <= SNMP_MAX_VALUE_SIZE);
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vb->value = memp_malloc(MEMP_SNMP_VALUE);
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LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
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if (vb->value != NULL)
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{
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mn->get_value(&object_def, vb->value_len, vb->value);
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snmp_varbind_tail_add(&msg_ps->outvb, vb);
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msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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msg_ps->vb_idx += 1;
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}
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else
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{
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
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msg_ps->vb_ptr->ident = vb->ident;
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msg_ps->vb_ptr->ident_len = vb->ident_len;
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memp_free(MEMP_SNMP_VARBIND, vb);
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snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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}
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}
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else
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{
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/* vb->value_len == 0, empty value (e.g. empty string) */
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vb->value = NULL;
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snmp_varbind_tail_add(&msg_ps->outvb, vb);
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msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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msg_ps->vb_idx += 1;
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}
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}
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else
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{
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n"));
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snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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}
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}
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}
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}
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}
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else
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{
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mn = NULL;
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}
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if (mn == NULL)
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{
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/* mn == NULL, noSuchName */
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snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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}
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}
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if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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(msg_ps->vb_idx == msg_ps->invb.count))
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{
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snmp_ok_response(msg_ps);
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}
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}
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/**
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* Service an internal or external event for SNMP GETNEXT.
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*
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* @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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* @param msg_ps points to the assosicated message process state
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*/
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static void
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snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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{
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
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if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
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{
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struct mib_external_node *en;
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/* get_object_def() answer*/
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en = msg_ps->ext_mib_node;
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/* translate answer into a known lifeform */
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en->get_object_def_a(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1], &msg_ps->ext_object_def);
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if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
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{
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msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
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en->get_value_q(request_id, &msg_ps->ext_object_def);
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}
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else
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{
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en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
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/* search failed, object id points to unknown object (nosuchname) */
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snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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}
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}
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else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
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{
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struct mib_external_node *en;
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struct snmp_varbind *vb;
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/* get_value() answer */
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en = msg_ps->ext_mib_node;
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LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
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vb = snmp_varbind_alloc(&msg_ps->ext_oid,
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msg_ps->ext_object_def.asn_type,
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(u8_t)msg_ps->ext_object_def.v_len);
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if (vb != NULL)
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{
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en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
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snmp_varbind_tail_add(&msg_ps->outvb, vb);
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msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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msg_ps->vb_idx += 1;
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}
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else
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{
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en->get_value_pc(request_id, &msg_ps->ext_object_def);
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LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
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snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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}
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}
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while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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(msg_ps->vb_idx < msg_ps->invb.count))
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{
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struct mib_node *mn;
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struct snmp_obj_id oid;
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if (msg_ps->vb_idx == 0)
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{
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msg_ps->vb_ptr = msg_ps->invb.head;
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}
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else
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{
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msg_ps->vb_ptr = msg_ps->vb_ptr->next;
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}
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if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
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|
{
|
|
if (msg_ps->vb_ptr->ident_len > 3)
|
|
{
|
|
/* can offset ident_len and ident */
|
|
mn = snmp_expand_tree((struct mib_node*)&internet,
|
|
msg_ps->vb_ptr->ident_len - 4,
|
|
msg_ps->vb_ptr->ident + 4, &oid);
|
|
}
|
|
else
|
|
{
|
|
/* can't offset ident_len -4, ident + 4 */
|
|
mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mn = NULL;
|
|
}
|
|
if (mn != NULL)
|
|
{
|
|
if (mn->node_type == MIB_NODE_EX)
|
|
{
|
|
/* external object */
|
|
struct mib_external_node *en = (struct mib_external_node*)mn;
|
|
|
|
msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
|
|
/* save en && args in msg_ps!! */
|
|
msg_ps->ext_mib_node = en;
|
|
msg_ps->ext_oid = oid;
|
|
|
|
en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]);
|
|
}
|
|
else
|
|
{
|
|
/* internal object */
|
|
struct obj_def object_def;
|
|
struct snmp_varbind *vb;
|
|
|
|
msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
|
|
mn->get_object_def(1, &oid.id[oid.len - 1], &object_def);
|
|
|
|
LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
|
|
vb = snmp_varbind_alloc(&oid, object_def.asn_type, (u8_t)object_def.v_len);
|
|
if (vb != NULL)
|
|
{
|
|
msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
|
|
mn->get_value(&object_def, object_def.v_len, vb->value);
|
|
snmp_varbind_tail_add(&msg_ps->outvb, vb);
|
|
msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
|
msg_ps->vb_idx += 1;
|
|
}
|
|
else
|
|
{
|
|
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n"));
|
|
snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
|
|
}
|
|
}
|
|
}
|
|
if (mn == NULL)
|
|
{
|
|
/* mn == NULL, noSuchName */
|
|
snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
|
}
|
|
}
|
|
if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
|
(msg_ps->vb_idx == msg_ps->invb.count))
|
|
{
|
|
snmp_ok_response(msg_ps);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Service an internal or external event for SNMP SET.
|
|
*
|
|
* @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
|
|
* @param msg_ps points to the assosicated message process state
|
|
*/
|
|
static void
|
|
snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
|
|
{
|
|
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
|
|
|
|
if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
|
|
{
|
|
struct mib_external_node *en;
|
|
struct snmp_name_ptr np;
|
|
|
|
/* get_object_def() answer*/
|
|
en = msg_ps->ext_mib_node;
|
|
np = msg_ps->ext_name_ptr;
|
|
|
|
/* translate answer into a known lifeform */
|
|
en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
|
|
if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
|
|
{
|
|
msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST;
|
|
en->set_test_q(request_id, &msg_ps->ext_object_def);
|
|
}
|
|
else
|
|
{
|
|
en->get_object_def_pc(request_id, np.ident_len, np.ident);
|
|
/* search failed, object id points to unknown object (nosuchname) */
|
|
snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
|
}
|
|
}
|
|
else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST)
|
|
{
|
|
struct mib_external_node *en;
|
|
|
|
/* set_test() answer*/
|
|
en = msg_ps->ext_mib_node;
|
|
|
|
if (msg_ps->ext_object_def.access & MIB_ACCESS_WRITE)
|
|
{
|
|
if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) &&
|
|
(en->set_test_a(request_id,&msg_ps->ext_object_def,
|
|
msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
|
|
{
|
|
msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
|
msg_ps->vb_idx += 1;
|
|
}
|
|
else
|
|
{
|
|
en->set_test_pc(request_id,&msg_ps->ext_object_def);
|
|
/* bad value */
|
|
snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
en->set_test_pc(request_id,&msg_ps->ext_object_def);
|
|
/* object not available for set */
|
|
snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
|
}
|
|
}
|
|
else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S)
|
|
{
|
|
struct mib_external_node *en;
|
|
struct snmp_name_ptr np;
|
|
|
|
/* get_object_def() answer*/
|
|
en = msg_ps->ext_mib_node;
|
|
np = msg_ps->ext_name_ptr;
|
|
|
|
/* translate answer into a known lifeform */
|
|
en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
|
|
if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
|
|
{
|
|
msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE;
|
|
en->set_value_q(request_id, &msg_ps->ext_object_def,
|
|
msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
|
|
}
|
|
else
|
|
{
|
|
en->get_object_def_pc(request_id, np.ident_len, np.ident);
|
|
/* set_value failed, object has disappeared for some odd reason?? */
|
|
snmp_error_response(msg_ps,SNMP_ES_GENERROR);
|
|
}
|
|
}
|
|
else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE)
|
|
{
|
|
struct mib_external_node *en;
|
|
|
|
/** set_value_a() */
|
|
en = msg_ps->ext_mib_node;
|
|
en->set_value_a(request_id, &msg_ps->ext_object_def,
|
|
msg_ps->vb_ptr->value_len, msg_ps->vb_ptr->value);
|
|
|
|
/** @todo use set_value_pc() if toobig */
|
|
msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
|
|
msg_ps->vb_idx += 1;
|
|
}
|
|
|
|
/* test all values before setting */
|
|
while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
|
(msg_ps->vb_idx < msg_ps->invb.count))
|
|
{
|
|
struct mib_node *mn;
|
|
struct snmp_name_ptr np;
|
|
|
|
if (msg_ps->vb_idx == 0)
|
|
{
|
|
msg_ps->vb_ptr = msg_ps->invb.head;
|
|
}
|
|
else
|
|
{
|
|
msg_ps->vb_ptr = msg_ps->vb_ptr->next;
|
|
}
|
|
/** test object identifier for .iso.org.dod.internet prefix */
|
|
if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
|
|
{
|
|
mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
|
|
msg_ps->vb_ptr->ident + 4, &np);
|
|
if (mn != NULL)
|
|
{
|
|
if (mn->node_type == MIB_NODE_EX)
|
|
{
|
|
/* external object */
|
|
struct mib_external_node *en = (struct mib_external_node*)mn;
|
|
|
|
msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
|
|
/* save en && args in msg_ps!! */
|
|
msg_ps->ext_mib_node = en;
|
|
msg_ps->ext_name_ptr = np;
|
|
|
|
en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
|
|
}
|
|
else
|
|
{
|
|
/* internal object */
|
|
struct obj_def object_def;
|
|
|
|
msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
|
|
mn->get_object_def(np.ident_len, np.ident, &object_def);
|
|
if (object_def.instance != MIB_OBJECT_NONE)
|
|
{
|
|
mn = mn;
|
|
}
|
|
else
|
|
{
|
|
/* search failed, object id points to unknown object (nosuchname) */
|
|
mn = NULL;
|
|
}
|
|
if (mn != NULL)
|
|
{
|
|
msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST;
|
|
|
|
if (object_def.access & MIB_ACCESS_WRITE)
|
|
{
|
|
if ((object_def.asn_type == msg_ps->vb_ptr->value_type) &&
|
|
(mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
|
|
{
|
|
msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
|
msg_ps->vb_idx += 1;
|
|
}
|
|
else
|
|
{
|
|
/* bad value */
|
|
snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* object not available for set */
|
|
snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mn = NULL;
|
|
}
|
|
if (mn == NULL)
|
|
{
|
|
/* mn == NULL, noSuchName */
|
|
snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
|
}
|
|
}
|
|
|
|
if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
|
(msg_ps->vb_idx == msg_ps->invb.count))
|
|
{
|
|
msg_ps->vb_idx = 0;
|
|
msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
|
|
}
|
|
|
|
/* set all values "atomically" (be as "atomic" as possible) */
|
|
while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
|
|
(msg_ps->vb_idx < msg_ps->invb.count))
|
|
{
|
|
struct mib_node *mn;
|
|
struct snmp_name_ptr np;
|
|
|
|
if (msg_ps->vb_idx == 0)
|
|
{
|
|
msg_ps->vb_ptr = msg_ps->invb.head;
|
|
}
|
|
else
|
|
{
|
|
msg_ps->vb_ptr = msg_ps->vb_ptr->next;
|
|
}
|
|
/* skip iso prefix test, was done previously while settesting() */
|
|
mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
|
|
msg_ps->vb_ptr->ident + 4, &np);
|
|
/* check if object is still available
|
|
(e.g. external hot-plug thingy present?) */
|
|
if (mn != NULL)
|
|
{
|
|
if (mn->node_type == MIB_NODE_EX)
|
|
{
|
|
/* external object */
|
|
struct mib_external_node *en = (struct mib_external_node*)mn;
|
|
|
|
msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S;
|
|
/* save en && args in msg_ps!! */
|
|
msg_ps->ext_mib_node = en;
|
|
msg_ps->ext_name_ptr = np;
|
|
|
|
en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
|
|
}
|
|
else
|
|
{
|
|
/* internal object */
|
|
struct obj_def object_def;
|
|
|
|
msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S;
|
|
mn->get_object_def(np.ident_len, np.ident, &object_def);
|
|
msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
|
|
mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
|
|
msg_ps->vb_idx += 1;
|
|
}
|
|
}
|
|
}
|
|
if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
|
|
(msg_ps->vb_idx == msg_ps->invb.count))
|
|
{
|
|
/* simply echo the input if we can set it
|
|
@todo do we need to return the actual value?
|
|
e.g. if value is silently modified or behaves sticky? */
|
|
msg_ps->outvb = msg_ps->invb;
|
|
msg_ps->invb.head = NULL;
|
|
msg_ps->invb.tail = NULL;
|
|
msg_ps->invb.count = 0;
|
|
snmp_ok_response(msg_ps);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Handle one internal or external event.
|
|
* Called for one async event. (recv external/private answer)
|
|
*
|
|
* @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
|
|
*/
|
|
void
|
|
snmp_msg_event(u8_t request_id)
|
|
{
|
|
struct snmp_msg_pstat *msg_ps;
|
|
|
|
if (request_id < SNMP_CONCURRENT_REQUESTS)
|
|
{
|
|
msg_ps = &msg_input_list[request_id];
|
|
if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ)
|
|
{
|
|
snmp_msg_getnext_event(request_id, msg_ps);
|
|
}
|
|
else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ)
|
|
{
|
|
snmp_msg_get_event(request_id, msg_ps);
|
|
}
|
|
else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)
|
|
{
|
|
snmp_msg_set_event(request_id, msg_ps);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* lwIP UDP receive callback function */
|
|
static void
|
|
snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
|
|
{
|
|
struct snmp_msg_pstat *msg_ps;
|
|
u8_t req_idx;
|
|
err_t err_ret;
|
|
u16_t payload_len = p->tot_len;
|
|
u16_t payload_ofs = 0;
|
|
u16_t varbind_ofs = 0;
|
|
|
|
/* suppress unused argument warning */
|
|
LWIP_UNUSED_ARG(arg);
|
|
|
|
/* traverse input message process list, look for SNMP_MSG_EMPTY */
|
|
msg_ps = &msg_input_list[0];
|
|
req_idx = 0;
|
|
while ((req_idx < SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY))
|
|
{
|
|
req_idx++;
|
|
msg_ps++;
|
|
}
|
|
if (req_idx == SNMP_CONCURRENT_REQUESTS)
|
|
{
|
|
/* exceeding number of concurrent requests */
|
|
pbuf_free(p);
|
|
return;
|
|
}
|
|
|
|
/* accepting request */
|
|
snmp_inc_snmpinpkts();
|
|
/* record used 'protocol control block' */
|
|
msg_ps->pcb = pcb;
|
|
/* source address (network order) */
|
|
msg_ps->sip = *addr;
|
|
/* source port (host order (lwIP oddity)) */
|
|
msg_ps->sp = port;
|
|
|
|
/* check total length, version, community, pdu type */
|
|
err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
|
|
/* Only accept requests and requests without error (be robust) */
|
|
/* Reject response and trap headers or error requests as input! */
|
|
if ((err_ret != ERR_OK) ||
|
|
((msg_ps->rt != SNMP_ASN1_PDU_GET_REQ) &&
|
|
(msg_ps->rt != SNMP_ASN1_PDU_GET_NEXT_REQ) &&
|
|
(msg_ps->rt != SNMP_ASN1_PDU_SET_REQ)) ||
|
|
((msg_ps->error_status != SNMP_ES_NOERROR) ||
|
|
(msg_ps->error_index != 0)) )
|
|
{
|
|
/* header check failed drop request silently, do not return error! */
|
|
pbuf_free(p);
|
|
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
|
|
return;
|
|
}
|
|
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
|
|
|
|
/* Builds a list of variable bindings. Copy the varbinds from the pbuf
|
|
chain to glue them when these are divided over two or more pbuf's. */
|
|
err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
|
|
/* we've decoded the incoming message, release input msg now */
|
|
pbuf_free(p);
|
|
if ((err_ret != ERR_OK) || (msg_ps->invb.count == 0))
|
|
{
|
|
/* varbind-list decode failed, or varbind list empty.
|
|
drop request silently, do not return error!
|
|
(errors are only returned for a specific varbind failure) */
|
|
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
|
|
return;
|
|
}
|
|
|
|
msg_ps->error_status = SNMP_ES_NOERROR;
|
|
msg_ps->error_index = 0;
|
|
/* find object for each variable binding */
|
|
msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
|
/* first variable binding from list to inspect */
|
|
msg_ps->vb_idx = 0;
|
|
|
|
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
|
|
|
|
/* handle input event and as much objects as possible in one go */
|
|
snmp_msg_event(req_idx);
|
|
}
|
|
|
|
/**
|
|
* Checks and decodes incoming SNMP message header, logs header errors.
|
|
*
|
|
* @param p points to pbuf chain of SNMP message (UDP payload)
|
|
* @param ofs points to first octet of SNMP message
|
|
* @param pdu_len the length of the UDP payload
|
|
* @param ofs_ret returns the ofset of the variable bindings
|
|
* @param m_stat points to the current message request state return
|
|
* @return
|
|
* - ERR_OK SNMP header is sane and accepted
|
|
* - ERR_ARG SNMP header is either malformed or rejected
|
|
*/
|
|
static err_t
|
|
snmp_pdu_header_check(struct pbuf *p, u16_t ofs, u16_t pdu_len, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
|
|
{
|
|
err_t derr;
|
|
u16_t len, ofs_base;
|
|
u8_t len_octets;
|
|
u8_t type;
|
|
s32_t version;
|
|
|
|
ofs_base = ofs;
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) ||
|
|
(pdu_len != (1 + len_octets + len)) ||
|
|
(type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
|
|
{
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets);
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
|
{
|
|
/* can't decode or no integer (version) */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version);
|
|
if (derr != ERR_OK)
|
|
{
|
|
/* can't decode */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
if (version != 0)
|
|
{
|
|
/* not version 1 */
|
|
snmp_inc_snmpinbadversions();
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets + len);
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)))
|
|
{
|
|
/* can't decode or no octet string (community) */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community);
|
|
if (derr != ERR_OK)
|
|
{
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
/* add zero terminator */
|
|
len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN));
|
|
m_stat->community[len] = 0;
|
|
m_stat->com_strlen = (u8_t)len;
|
|
if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0)
|
|
{
|
|
/** @todo: move this if we need to check more names */
|
|
snmp_inc_snmpinbadcommunitynames();
|
|
snmp_authfail_trap();
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets + len);
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if (derr != ERR_OK)
|
|
{
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
switch(type)
|
|
{
|
|
case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ):
|
|
/* GetRequest PDU */
|
|
snmp_inc_snmpingetrequests();
|
|
derr = ERR_OK;
|
|
break;
|
|
case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ):
|
|
/* GetNextRequest PDU */
|
|
snmp_inc_snmpingetnexts();
|
|
derr = ERR_OK;
|
|
break;
|
|
case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP):
|
|
/* GetResponse PDU */
|
|
snmp_inc_snmpingetresponses();
|
|
derr = ERR_ARG;
|
|
break;
|
|
case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ):
|
|
/* SetRequest PDU */
|
|
snmp_inc_snmpinsetrequests();
|
|
derr = ERR_OK;
|
|
break;
|
|
case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP):
|
|
/* Trap PDU */
|
|
snmp_inc_snmpintraps();
|
|
derr = ERR_ARG;
|
|
break;
|
|
default:
|
|
snmp_inc_snmpinasnparseerrs();
|
|
derr = ERR_ARG;
|
|
break;
|
|
}
|
|
if (derr != ERR_OK)
|
|
{
|
|
/* unsupported input PDU for this agent (no parse error) */
|
|
return ERR_ARG;
|
|
}
|
|
m_stat->rt = type & 0x1F;
|
|
ofs += (1 + len_octets);
|
|
if (len != (pdu_len - (ofs - ofs_base)))
|
|
{
|
|
/* decoded PDU length does not equal actual payload length */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
|
{
|
|
/* can't decode or no integer (request ID) */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid);
|
|
if (derr != ERR_OK)
|
|
{
|
|
/* can't decode */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets + len);
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
|
{
|
|
/* can't decode or no integer (error-status) */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
/* must be noError (0) for incoming requests.
|
|
log errors for mib-2 completeness and for debug purposes */
|
|
derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status);
|
|
if (derr != ERR_OK)
|
|
{
|
|
/* can't decode */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
switch (m_stat->error_status)
|
|
{
|
|
case SNMP_ES_TOOBIG:
|
|
snmp_inc_snmpintoobigs();
|
|
break;
|
|
case SNMP_ES_NOSUCHNAME:
|
|
snmp_inc_snmpinnosuchnames();
|
|
break;
|
|
case SNMP_ES_BADVALUE:
|
|
snmp_inc_snmpinbadvalues();
|
|
break;
|
|
case SNMP_ES_READONLY:
|
|
snmp_inc_snmpinreadonlys();
|
|
break;
|
|
case SNMP_ES_GENERROR:
|
|
snmp_inc_snmpingenerrs();
|
|
break;
|
|
}
|
|
ofs += (1 + len_octets + len);
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
|
{
|
|
/* can't decode or no integer (error-index) */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
/* must be 0 for incoming requests.
|
|
decode anyway to catch bad integers (and dirty tricks) */
|
|
derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index);
|
|
if (derr != ERR_OK)
|
|
{
|
|
/* can't decode */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets + len);
|
|
*ofs_ret = ofs;
|
|
return ERR_OK;
|
|
}
|
|
|
|
static err_t
|
|
snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
|
|
{
|
|
err_t derr;
|
|
u16_t len, vb_len;
|
|
u8_t len_octets;
|
|
u8_t type;
|
|
|
|
/* variable binding list */
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len);
|
|
if ((derr != ERR_OK) ||
|
|
(type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
|
|
{
|
|
snmp_inc_snmpinasnparseerrs();
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets);
|
|
|
|
/* start with empty list */
|
|
m_stat->invb.count = 0;
|
|
m_stat->invb.head = NULL;
|
|
m_stat->invb.tail = NULL;
|
|
|
|
while (vb_len > 0)
|
|
{
|
|
struct snmp_obj_id oid, oid_value;
|
|
struct snmp_varbind *vb;
|
|
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) ||
|
|
(type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) ||
|
|
(len == 0) || (len > vb_len))
|
|
{
|
|
snmp_inc_snmpinasnparseerrs();
|
|
/* free varbinds (if available) */
|
|
snmp_varbind_list_free(&m_stat->invb);
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets);
|
|
vb_len -= (1 + len_octets);
|
|
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)))
|
|
{
|
|
/* can't decode object name length */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
/* free varbinds (if available) */
|
|
snmp_varbind_list_free(&m_stat->invb);
|
|
return ERR_ARG;
|
|
}
|
|
derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid);
|
|
if (derr != ERR_OK)
|
|
{
|
|
/* can't decode object name */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
/* free varbinds (if available) */
|
|
snmp_varbind_list_free(&m_stat->invb);
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets + len);
|
|
vb_len -= (1 + len_octets + len);
|
|
|
|
snmp_asn1_dec_type(p, ofs, &type);
|
|
derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
|
if (derr != ERR_OK)
|
|
{
|
|
/* can't decode object value length */
|
|
snmp_inc_snmpinasnparseerrs();
|
|
/* free varbinds (if available) */
|
|
snmp_varbind_list_free(&m_stat->invb);
|
|
return ERR_ARG;
|
|
}
|
|
|
|
switch (type)
|
|
{
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
|
|
vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t));
|
|
if (vb != NULL)
|
|
{
|
|
s32_t *vptr = (s32_t*)vb->value;
|
|
|
|
derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr);
|
|
snmp_varbind_tail_add(&m_stat->invb, vb);
|
|
}
|
|
else
|
|
{
|
|
derr = ERR_ARG;
|
|
}
|
|
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):
|
|
vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t));
|
|
if (vb != NULL)
|
|
{
|
|
u32_t *vptr = (u32_t*)vb->value;
|
|
|
|
derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr);
|
|
snmp_varbind_tail_add(&m_stat->invb, vb);
|
|
}
|
|
else
|
|
{
|
|
derr = ERR_ARG;
|
|
}
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
|
|
LWIP_ASSERT("invalid length", len <= 0xff);
|
|
vb = snmp_varbind_alloc(&oid, type, (u8_t)len);
|
|
if (vb != NULL)
|
|
{
|
|
derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
|
|
snmp_varbind_tail_add(&m_stat->invb, vb);
|
|
}
|
|
else
|
|
{
|
|
derr = ERR_ARG;
|
|
}
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
|
|
vb = snmp_varbind_alloc(&oid, type, 0);
|
|
if (vb != NULL)
|
|
{
|
|
snmp_varbind_tail_add(&m_stat->invb, vb);
|
|
derr = ERR_OK;
|
|
}
|
|
else
|
|
{
|
|
derr = ERR_ARG;
|
|
}
|
|
break;
|
|
case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
|
|
derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value);
|
|
if (derr == ERR_OK)
|
|
{
|
|
vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t));
|
|
if (vb != NULL)
|
|
{
|
|
u8_t i = oid_value.len;
|
|
s32_t *vptr = (s32_t*)vb->value;
|
|
|
|
while(i > 0)
|
|
{
|
|
i--;
|
|
vptr[i] = oid_value.id[i];
|
|
}
|
|
snmp_varbind_tail_add(&m_stat->invb, vb);
|
|
derr = ERR_OK;
|
|
}
|
|
else
|
|
{
|
|
derr = ERR_ARG;
|
|
}
|
|
}
|
|
break;
|
|
case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
|
|
if (len == 4)
|
|
{
|
|
/* must be exactly 4 octets! */
|
|
vb = snmp_varbind_alloc(&oid, type, 4);
|
|
if (vb != NULL)
|
|
{
|
|
derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
|
|
snmp_varbind_tail_add(&m_stat->invb, vb);
|
|
}
|
|
else
|
|
{
|
|
derr = ERR_ARG;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
derr = ERR_ARG;
|
|
}
|
|
break;
|
|
default:
|
|
derr = ERR_ARG;
|
|
break;
|
|
}
|
|
if (derr != ERR_OK)
|
|
{
|
|
snmp_inc_snmpinasnparseerrs();
|
|
/* free varbinds (if available) */
|
|
snmp_varbind_list_free(&m_stat->invb);
|
|
return ERR_ARG;
|
|
}
|
|
ofs += (1 + len_octets + len);
|
|
vb_len -= (1 + len_octets + len);
|
|
}
|
|
|
|
if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ)
|
|
{
|
|
snmp_add_snmpintotalsetvars(m_stat->invb.count);
|
|
}
|
|
else
|
|
{
|
|
snmp_add_snmpintotalreqvars(m_stat->invb.count);
|
|
}
|
|
|
|
*ofs_ret = ofs;
|
|
return ERR_OK;
|
|
}
|
|
|
|
struct snmp_varbind*
|
|
snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
|
|
{
|
|
struct snmp_varbind *vb;
|
|
|
|
vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
|
|
LWIP_ASSERT("vb != NULL",vb != NULL);
|
|
if (vb != NULL)
|
|
{
|
|
u8_t i;
|
|
|
|
vb->next = NULL;
|
|
vb->prev = NULL;
|
|
i = oid->len;
|
|
vb->ident_len = i;
|
|
if (i > 0)
|
|
{
|
|
LWIP_ASSERT("SNMP_MAX_TREE_DEPTH is configured too low", i <= SNMP_MAX_TREE_DEPTH);
|
|
/* allocate array of s32_t for our object identifier */
|
|
vb->ident = (s32_t*)memp_malloc(MEMP_SNMP_VALUE);
|
|
LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL);
|
|
if (vb->ident == NULL)
|
|
{
|
|
memp_free(MEMP_SNMP_VARBIND, vb);
|
|
return NULL;
|
|
}
|
|
while(i > 0)
|
|
{
|
|
i--;
|
|
vb->ident[i] = oid->id[i];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* i == 0, pass zero length object identifier */
|
|
vb->ident = NULL;
|
|
}
|
|
vb->value_type = type;
|
|
vb->value_len = len;
|
|
if (len > 0)
|
|
{
|
|
LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
|
|
/* allocate raw bytes for our object value */
|
|
vb->value = memp_malloc(MEMP_SNMP_VALUE);
|
|
LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
|
|
if (vb->value == NULL)
|
|
{
|
|
if (vb->ident != NULL)
|
|
{
|
|
memp_free(MEMP_SNMP_VALUE, vb->ident);
|
|
}
|
|
memp_free(MEMP_SNMP_VARBIND, vb);
|
|
return NULL;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* ASN1_NUL type, or zero length ASN1_OC_STR */
|
|
vb->value = NULL;
|
|
}
|
|
}
|
|
return vb;
|
|
}
|
|
|
|
void
|
|
snmp_varbind_free(struct snmp_varbind *vb)
|
|
{
|
|
if (vb->value != NULL )
|
|
{
|
|
memp_free(MEMP_SNMP_VALUE, vb->value);
|
|
}
|
|
if (vb->ident != NULL )
|
|
{
|
|
memp_free(MEMP_SNMP_VALUE, vb->ident);
|
|
}
|
|
memp_free(MEMP_SNMP_VARBIND, vb);
|
|
}
|
|
|
|
void
|
|
snmp_varbind_list_free(struct snmp_varbind_root *root)
|
|
{
|
|
struct snmp_varbind *vb, *prev;
|
|
|
|
vb = root->tail;
|
|
while ( vb != NULL )
|
|
{
|
|
prev = vb->prev;
|
|
snmp_varbind_free(vb);
|
|
vb = prev;
|
|
}
|
|
root->count = 0;
|
|
root->head = NULL;
|
|
root->tail = NULL;
|
|
}
|
|
|
|
void
|
|
snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb)
|
|
{
|
|
if (root->count == 0)
|
|
{
|
|
/* add first varbind to list */
|
|
root->head = vb;
|
|
root->tail = vb;
|
|
}
|
|
else
|
|
{
|
|
/* add nth varbind to list tail */
|
|
root->tail->next = vb;
|
|
vb->prev = root->tail;
|
|
root->tail = vb;
|
|
}
|
|
root->count += 1;
|
|
}
|
|
|
|
struct snmp_varbind*
|
|
snmp_varbind_tail_remove(struct snmp_varbind_root *root)
|
|
{
|
|
struct snmp_varbind* vb;
|
|
|
|
if (root->count > 0)
|
|
{
|
|
/* remove tail varbind */
|
|
vb = root->tail;
|
|
root->tail = vb->prev;
|
|
vb->prev->next = NULL;
|
|
root->count -= 1;
|
|
}
|
|
else
|
|
{
|
|
/* nothing to remove */
|
|
vb = NULL;
|
|
}
|
|
return vb;
|
|
}
|
|
|
|
#endif /* LWIP_SNMP */
|