+++ /dev/null
-/**
- * @file
- * SNMP input message processing (RFC1157).
- */
-
-/*
- * 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/snmp.h"
-#include "lwip/snmp_asn1.h"
-#include "lwip/snmp_msg.h"
-#include "lwip/snmp_structs.h"
-#include "lwip/ip_addr.h"
-#include "lwip/memp.h"
-#include "lwip/udp.h"
-#include "lwip/stats.h"
-
-#include <string.h>
-
-/* public (non-static) constants */
-/** SNMP v1 == 0 */
-const s32_t snmp_version = 0;
-/** default SNMP community string */
-const char snmp_publiccommunity[7] = "public";
-
-/* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
-struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
-/* UDP Protocol Control Block */
-struct udp_pcb *snmp1_pcb;
-
-static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
-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);
-static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
-
-
-/**
- * Starts SNMP Agent.
- * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
- */
-void
-snmp_init(void)
-{
- struct snmp_msg_pstat *msg_ps;
- u8_t i;
-
- snmp1_pcb = udp_new();
- if (snmp1_pcb != NULL)
- {
- udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
- udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
- }
- msg_ps = &msg_input_list[0];
- for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
- {
- msg_ps->state = SNMP_MSG_EMPTY;
- msg_ps->error_index = 0;
- msg_ps->error_status = SNMP_ES_NOERROR;
- msg_ps++;
- }
- trap_msg.pcb = snmp1_pcb;
-
-#ifdef SNMP_PRIVATE_MIB_INIT
- /* If defined, this must be a function-like define to initialize the
- * private MIB after the stack has been initialized.
- * The private MIB can also be initialized in tcpip_callback (or after
- * the stack is initialized), this define is only for convenience. */
- SNMP_PRIVATE_MIB_INIT();
-#endif /* SNMP_PRIVATE_MIB_INIT */
-
- /* The coldstart trap will only be output
- if our outgoing interface is up & configured */
- snmp_coldstart_trap();
-}
-
-static void
-snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
-{
- /* move names back from outvb to invb */
- int v;
- struct snmp_varbind *vbi = msg_ps->invb.head;
- struct snmp_varbind *vbo = msg_ps->outvb.head;
- for (v=0; v<msg_ps->vb_idx; v++) {
- vbi->ident_len = vbo->ident_len;
- vbo->ident_len = 0;
- vbi->ident = vbo->ident;
- vbo->ident = NULL;
- vbi = vbi->next;
- vbo = vbo->next;
- }
- /* free outvb */
- snmp_varbind_list_free(&msg_ps->outvb);
- /* we send invb back */
- msg_ps->outvb = msg_ps->invb;
- msg_ps->invb.head = NULL;
- msg_ps->invb.tail = NULL;
- msg_ps->invb.count = 0;
- msg_ps->error_status = error;
- /* error index must be 0 for error too big */
- msg_ps->error_index = (error != SNMP_ES_TOOBIG) ? (1 + msg_ps->vb_idx) : 0;
- snmp_send_response(msg_ps);
- snmp_varbind_list_free(&msg_ps->outvb);
- msg_ps->state = SNMP_MSG_EMPTY;
-}
-
-static void
-snmp_ok_response(struct snmp_msg_pstat *msg_ps)
-{
- err_t err_ret;
-
- err_ret = snmp_send_response(msg_ps);
- if (err_ret == ERR_MEM)
- {
- /* serious memory problem, can't return tooBig */
- }
- else
- {
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
- }
- /* free varbinds (if available) */
- snmp_varbind_list_free(&msg_ps->invb);
- snmp_varbind_list_free(&msg_ps->outvb);
- msg_ps->state = SNMP_MSG_EMPTY;
-}
-
-/**
- * Service an internal or external event for SNMP GET.
- *
- * @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_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
-{
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_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->ext_object_def.access & MIB_ACCESS_READ))
- {
- msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
- en->get_value_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_GET_VALUE)
- {
- struct mib_external_node *en;
- struct snmp_varbind *vb;
-
- /* get_value() answer */
- en = msg_ps->ext_mib_node;
-
- /* allocate output varbind */
- vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
- if (vb != NULL)
- {
- vb->next = NULL;
- vb->prev = NULL;
-
- /* move name from invb to outvb */
- vb->ident = msg_ps->vb_ptr->ident;
- vb->ident_len = msg_ps->vb_ptr->ident_len;
- /* ensure this memory is refereced once only */
- msg_ps->vb_ptr->ident = NULL;
- msg_ps->vb_ptr->ident_len = 0;
-
- vb->value_type = msg_ps->ext_object_def.asn_type;
- LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
- vb->value_len = (u8_t)msg_ps->ext_object_def.v_len;
- if (vb->value_len > 0)
- {
- LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
- vb->value = memp_malloc(MEMP_SNMP_VALUE);
- if (vb->value != NULL)
- {
- en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
- snmp_varbind_tail_add(&msg_ps->outvb, vb);
- /* search again (if vb_idx < msg_ps->invb.count) */
- msg_ps->state = SNMP_MSG_SEARCH_OBJ;
- msg_ps->vb_idx += 1;
- }
- else
- {
- en->get_value_pc(request_id, &msg_ps->ext_object_def);
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
- msg_ps->vb_ptr->ident = vb->ident;
- msg_ps->vb_ptr->ident_len = vb->ident_len;
- memp_free(MEMP_SNMP_VARBIND, vb);
- snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
- }
- }
- else
- {
- /* vb->value_len == 0, empty value (e.g. empty string) */
- en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
- vb->value = NULL;
- snmp_varbind_tail_add(&msg_ps->outvb, vb);
- /* search again (if vb_idx < msg_ps->invb.count) */
- msg_ps->state = SNMP_MSG_SEARCH_OBJ;
- msg_ps->vb_idx += 1;
- }
- }
- else
- {
- en->get_value_pc(request_id, &msg_ps->ext_object_def);
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
- snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
- }
- }
-
- 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) &&
- (object_def.access & MIB_ACCESS_READ))
- {
- mn = mn;
- }
- else
- {
- /* search failed, object id points to unknown object (nosuchname) */
- mn = NULL;
- }
- if (mn != NULL)
- {
- struct snmp_varbind *vb;
-
- msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
- /* allocate output varbind */
- vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
- if (vb != NULL)
- {
- vb->next = NULL;
- vb->prev = NULL;
-
- /* move name from invb to outvb */
- vb->ident = msg_ps->vb_ptr->ident;
- vb->ident_len = msg_ps->vb_ptr->ident_len;
- /* ensure this memory is refereced once only */
- msg_ps->vb_ptr->ident = NULL;
- msg_ps->vb_ptr->ident_len = 0;
-
- vb->value_type = object_def.asn_type;
- LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
- vb->value_len = (u8_t)object_def.v_len;
- if (vb->value_len > 0)
- {
- LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low",
- vb->value_len <= SNMP_MAX_VALUE_SIZE);
- vb->value = memp_malloc(MEMP_SNMP_VALUE);
- if (vb->value != NULL)
- {
- mn->get_value(&object_def, vb->value_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_msg_event: couldn't allocate variable space\n"));
- msg_ps->vb_ptr->ident = vb->ident;
- msg_ps->vb_ptr->ident_len = vb->ident_len;
- vb->ident = NULL;
- vb->ident_len = 0;
- memp_free(MEMP_SNMP_VARBIND, vb);
- snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
- }
- }
- else
- {
- /* vb->value_len == 0, empty value (e.g. empty string) */
- vb->value = NULL;
- 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_msg_event: couldn't allocate outvb space\n"));
- snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
- }
- }
- }
- }
- }
- 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))
- {
- snmp_ok_response(msg_ps);
- }
-}
-
-/**
- * Service an internal or external event for SNMP GETNEXT.
- *
- * @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_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
-{
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_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;
-
- /* get_object_def() answer*/
- en = msg_ps->ext_mib_node;
-
- /* translate answer into a known lifeform */
- en->get_object_def_a(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1], &msg_ps->ext_object_def);
- if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
- {
- msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
- en->get_value_q(request_id, &msg_ps->ext_object_def);
- }
- else
- {
- en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
- /* 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_GET_VALUE)
- {
- struct mib_external_node *en;
- struct snmp_varbind *vb;
-
- /* get_value() answer */
- en = msg_ps->ext_mib_node;
-
- LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
- vb = snmp_varbind_alloc(&msg_ps->ext_oid,
- msg_ps->ext_object_def.asn_type,
- (u8_t)msg_ps->ext_object_def.v_len);
- if (vb != NULL)
- {
- en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
- snmp_varbind_tail_add(&msg_ps->outvb, vb);
- msg_ps->state = SNMP_MSG_SEARCH_OBJ;
- msg_ps->vb_idx += 1;
- }
- else
- {
- en->get_value_pc(request_id, &msg_ps->ext_object_def);
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
- snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
- }
- }
-
- while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
- (msg_ps->vb_idx < msg_ps->invb.count))
- {
- struct mib_node *mn;
- struct snmp_obj_id oid;
-
- if (msg_ps->vb_idx == 0)
- {
- msg_ps->vb_ptr = msg_ps->invb.head;
- }
- else
- {
- msg_ps->vb_ptr = msg_ps->vb_ptr->next;
- }
- if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
- {
- 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);
- 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);
- if (vb->ident == NULL)
- {
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate ident value space\n"));
- 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);
- if (vb->value == NULL)
- {
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate value space\n"));
- 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;
- }
- }
- else
- {
- LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate varbind space\n"));
- }
- 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 */
projects / reactos.git / blobdiff