CK Sin / Mbed 2 deprecated Ethernetwebsocket

Ethernetwebsoc

Dependencies:   C12832_lcd LM75B WebSocketClient mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/snmp/msg_in.c@0:0ed2a7c7190c, 2013-05-31 (annotated)

Committer:
GordonSin
Date:
Fri May 31 04:09:54 2013 +0000
Revision:
0:0ed2a7c7190c
31/5/2013;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GordonSin 0:0ed2a7c7190c 1 /**
GordonSin 0:0ed2a7c7190c 2 * @file
GordonSin 0:0ed2a7c7190c 3 * SNMP input message processing (RFC1157).
GordonSin 0:0ed2a7c7190c 4 */
GordonSin 0:0ed2a7c7190c 5
GordonSin 0:0ed2a7c7190c 6 /*
GordonSin 0:0ed2a7c7190c 7 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
GordonSin 0:0ed2a7c7190c 8 * All rights reserved.
GordonSin 0:0ed2a7c7190c 9 *
GordonSin 0:0ed2a7c7190c 10 * Redistribution and use in source and binary forms, with or without modification,
GordonSin 0:0ed2a7c7190c 11 * are permitted provided that the following conditions are met:
GordonSin 0:0ed2a7c7190c 12 *
GordonSin 0:0ed2a7c7190c 13 * 1. Redistributions of source code must retain the above copyright notice,
GordonSin 0:0ed2a7c7190c 14 * this list of conditions and the following disclaimer.
GordonSin 0:0ed2a7c7190c 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
GordonSin 0:0ed2a7c7190c 16 * this list of conditions and the following disclaimer in the documentation
GordonSin 0:0ed2a7c7190c 17 * and/or other materials provided with the distribution.
GordonSin 0:0ed2a7c7190c 18 * 3. The name of the author may not be used to endorse or promote products
GordonSin 0:0ed2a7c7190c 19 * derived from this software without specific prior written permission.
GordonSin 0:0ed2a7c7190c 20 *
GordonSin 0:0ed2a7c7190c 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
GordonSin 0:0ed2a7c7190c 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
GordonSin 0:0ed2a7c7190c 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
GordonSin 0:0ed2a7c7190c 24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
GordonSin 0:0ed2a7c7190c 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
GordonSin 0:0ed2a7c7190c 26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
GordonSin 0:0ed2a7c7190c 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
GordonSin 0:0ed2a7c7190c 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
GordonSin 0:0ed2a7c7190c 29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
GordonSin 0:0ed2a7c7190c 30 * OF SUCH DAMAGE.
GordonSin 0:0ed2a7c7190c 31 *
GordonSin 0:0ed2a7c7190c 32 * Author: Christiaan Simons <christiaan.simons@axon.tv>
GordonSin 0:0ed2a7c7190c 33 */
GordonSin 0:0ed2a7c7190c 34
GordonSin 0:0ed2a7c7190c 35 #include "lwip/opt.h"
GordonSin 0:0ed2a7c7190c 36
GordonSin 0:0ed2a7c7190c 37 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
GordonSin 0:0ed2a7c7190c 38
GordonSin 0:0ed2a7c7190c 39 #include "lwip/snmp.h"
GordonSin 0:0ed2a7c7190c 40 #include "lwip/snmp_asn1.h"
GordonSin 0:0ed2a7c7190c 41 #include "lwip/snmp_msg.h"
GordonSin 0:0ed2a7c7190c 42 #include "lwip/snmp_structs.h"
GordonSin 0:0ed2a7c7190c 43 #include "lwip/ip_addr.h"
GordonSin 0:0ed2a7c7190c 44 #include "lwip/memp.h"
GordonSin 0:0ed2a7c7190c 45 #include "lwip/udp.h"
GordonSin 0:0ed2a7c7190c 46 #include "lwip/stats.h"
GordonSin 0:0ed2a7c7190c 47
GordonSin 0:0ed2a7c7190c 48 #include <string.h>
GordonSin 0:0ed2a7c7190c 49
GordonSin 0:0ed2a7c7190c 50 /* public (non-static) constants */
GordonSin 0:0ed2a7c7190c 51 /** SNMP v1 == 0 */
GordonSin 0:0ed2a7c7190c 52 const s32_t snmp_version = 0;
GordonSin 0:0ed2a7c7190c 53 /** default SNMP community string */
GordonSin 0:0ed2a7c7190c 54 const char snmp_publiccommunity[7] = "public";
GordonSin 0:0ed2a7c7190c 55
GordonSin 0:0ed2a7c7190c 56 /* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
GordonSin 0:0ed2a7c7190c 57 struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
GordonSin 0:0ed2a7c7190c 58 /* UDP Protocol Control Block */
GordonSin 0:0ed2a7c7190c 59 struct udp_pcb *snmp1_pcb;
GordonSin 0:0ed2a7c7190c 60
GordonSin 0:0ed2a7c7190c 61 static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
GordonSin 0:0ed2a7c7190c 62 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);
GordonSin 0:0ed2a7c7190c 63 static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
GordonSin 0:0ed2a7c7190c 64
GordonSin 0:0ed2a7c7190c 65
GordonSin 0:0ed2a7c7190c 66 /**
GordonSin 0:0ed2a7c7190c 67 * Starts SNMP Agent.
GordonSin 0:0ed2a7c7190c 68 * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
GordonSin 0:0ed2a7c7190c 69 */
GordonSin 0:0ed2a7c7190c 70 void
GordonSin 0:0ed2a7c7190c 71 snmp_init(void)
GordonSin 0:0ed2a7c7190c 72 {
GordonSin 0:0ed2a7c7190c 73 struct snmp_msg_pstat *msg_ps;
GordonSin 0:0ed2a7c7190c 74 u8_t i;
GordonSin 0:0ed2a7c7190c 75
GordonSin 0:0ed2a7c7190c 76 snmp1_pcb = udp_new();
GordonSin 0:0ed2a7c7190c 77 if (snmp1_pcb != NULL)
GordonSin 0:0ed2a7c7190c 78 {
GordonSin 0:0ed2a7c7190c 79 udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
GordonSin 0:0ed2a7c7190c 80 udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
GordonSin 0:0ed2a7c7190c 81 }
GordonSin 0:0ed2a7c7190c 82 msg_ps = &msg_input_list[0];
GordonSin 0:0ed2a7c7190c 83 for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
GordonSin 0:0ed2a7c7190c 84 {
GordonSin 0:0ed2a7c7190c 85 msg_ps->state = SNMP_MSG_EMPTY;
GordonSin 0:0ed2a7c7190c 86 msg_ps->error_index = 0;
GordonSin 0:0ed2a7c7190c 87 msg_ps->error_status = SNMP_ES_NOERROR;
GordonSin 0:0ed2a7c7190c 88 msg_ps++;
GordonSin 0:0ed2a7c7190c 89 }
GordonSin 0:0ed2a7c7190c 90 trap_msg.pcb = snmp1_pcb;
GordonSin 0:0ed2a7c7190c 91
GordonSin 0:0ed2a7c7190c 92 #ifdef SNMP_PRIVATE_MIB_INIT
GordonSin 0:0ed2a7c7190c 93 /* If defined, rhis must be a function-like define to initialize the
GordonSin 0:0ed2a7c7190c 94 * private MIB after the stack has been initialized.
GordonSin 0:0ed2a7c7190c 95 * The private MIB can also be initialized in tcpip_callback (or after
GordonSin 0:0ed2a7c7190c 96 * the stack is initialized), this define is only for convenience. */
GordonSin 0:0ed2a7c7190c 97 SNMP_PRIVATE_MIB_INIT();
GordonSin 0:0ed2a7c7190c 98 #endif /* SNMP_PRIVATE_MIB_INIT */
GordonSin 0:0ed2a7c7190c 99
GordonSin 0:0ed2a7c7190c 100 /* The coldstart trap will only be output
GordonSin 0:0ed2a7c7190c 101 if our outgoing interface is up & configured */
GordonSin 0:0ed2a7c7190c 102 snmp_coldstart_trap();
GordonSin 0:0ed2a7c7190c 103 }
GordonSin 0:0ed2a7c7190c 104
GordonSin 0:0ed2a7c7190c 105 static void
GordonSin 0:0ed2a7c7190c 106 snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
GordonSin 0:0ed2a7c7190c 107 {
GordonSin 0:0ed2a7c7190c 108 snmp_varbind_list_free(&msg_ps->outvb);
GordonSin 0:0ed2a7c7190c 109 msg_ps->outvb = msg_ps->invb;
GordonSin 0:0ed2a7c7190c 110 msg_ps->invb.head = NULL;
GordonSin 0:0ed2a7c7190c 111 msg_ps->invb.tail = NULL;
GordonSin 0:0ed2a7c7190c 112 msg_ps->invb.count = 0;
GordonSin 0:0ed2a7c7190c 113 msg_ps->error_status = error;
GordonSin 0:0ed2a7c7190c 114 msg_ps->error_index = 1 + msg_ps->vb_idx;
GordonSin 0:0ed2a7c7190c 115 snmp_send_response(msg_ps);
GordonSin 0:0ed2a7c7190c 116 snmp_varbind_list_free(&msg_ps->outvb);
GordonSin 0:0ed2a7c7190c 117 msg_ps->state = SNMP_MSG_EMPTY;
GordonSin 0:0ed2a7c7190c 118 }
GordonSin 0:0ed2a7c7190c 119
GordonSin 0:0ed2a7c7190c 120 static void
GordonSin 0:0ed2a7c7190c 121 snmp_ok_response(struct snmp_msg_pstat *msg_ps)
GordonSin 0:0ed2a7c7190c 122 {
GordonSin 0:0ed2a7c7190c 123 err_t err_ret;
GordonSin 0:0ed2a7c7190c 124
GordonSin 0:0ed2a7c7190c 125 err_ret = snmp_send_response(msg_ps);
GordonSin 0:0ed2a7c7190c 126 if (err_ret == ERR_MEM)
GordonSin 0:0ed2a7c7190c 127 {
GordonSin 0:0ed2a7c7190c 128 /* serious memory problem, can't return tooBig */
GordonSin 0:0ed2a7c7190c 129 }
GordonSin 0:0ed2a7c7190c 130 else
GordonSin 0:0ed2a7c7190c 131 {
GordonSin 0:0ed2a7c7190c 132 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
GordonSin 0:0ed2a7c7190c 133 }
GordonSin 0:0ed2a7c7190c 134 /* free varbinds (if available) */
GordonSin 0:0ed2a7c7190c 135 snmp_varbind_list_free(&msg_ps->invb);
GordonSin 0:0ed2a7c7190c 136 snmp_varbind_list_free(&msg_ps->outvb);
GordonSin 0:0ed2a7c7190c 137 msg_ps->state = SNMP_MSG_EMPTY;
GordonSin 0:0ed2a7c7190c 138 }
GordonSin 0:0ed2a7c7190c 139
GordonSin 0:0ed2a7c7190c 140 /**
GordonSin 0:0ed2a7c7190c 141 * Service an internal or external event for SNMP GET.
GordonSin 0:0ed2a7c7190c 142 *
GordonSin 0:0ed2a7c7190c 143 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
GordonSin 0:0ed2a7c7190c 144 * @param msg_ps points to the assosicated message process state
GordonSin 0:0ed2a7c7190c 145 */
GordonSin 0:0ed2a7c7190c 146 static void
GordonSin 0:0ed2a7c7190c 147 snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
GordonSin 0:0ed2a7c7190c 148 {
GordonSin 0:0ed2a7c7190c 149 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
GordonSin 0:0ed2a7c7190c 150
GordonSin 0:0ed2a7c7190c 151 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
GordonSin 0:0ed2a7c7190c 152 {
GordonSin 0:0ed2a7c7190c 153 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 154 struct snmp_name_ptr np;
GordonSin 0:0ed2a7c7190c 155
GordonSin 0:0ed2a7c7190c 156 /* get_object_def() answer*/
GordonSin 0:0ed2a7c7190c 157 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 158 np = msg_ps->ext_name_ptr;
GordonSin 0:0ed2a7c7190c 159
GordonSin 0:0ed2a7c7190c 160 /* translate answer into a known lifeform */
GordonSin 0:0ed2a7c7190c 161 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 162 if ((msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) &&
GordonSin 0:0ed2a7c7190c 163 (msg_ps->ext_object_def.access & MIB_ACCESS_READ))
GordonSin 0:0ed2a7c7190c 164 {
GordonSin 0:0ed2a7c7190c 165 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
GordonSin 0:0ed2a7c7190c 166 en->get_value_q(request_id, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 167 }
GordonSin 0:0ed2a7c7190c 168 else
GordonSin 0:0ed2a7c7190c 169 {
GordonSin 0:0ed2a7c7190c 170 en->get_object_def_pc(request_id, np.ident_len, np.ident);
GordonSin 0:0ed2a7c7190c 171 /* search failed, object id points to unknown object (nosuchname) */
GordonSin 0:0ed2a7c7190c 172 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 173 }
GordonSin 0:0ed2a7c7190c 174 }
GordonSin 0:0ed2a7c7190c 175 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
GordonSin 0:0ed2a7c7190c 176 {
GordonSin 0:0ed2a7c7190c 177 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 178 struct snmp_varbind *vb;
GordonSin 0:0ed2a7c7190c 179
GordonSin 0:0ed2a7c7190c 180 /* get_value() answer */
GordonSin 0:0ed2a7c7190c 181 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 182
GordonSin 0:0ed2a7c7190c 183 /* allocate output varbind */
GordonSin 0:0ed2a7c7190c 184 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
GordonSin 0:0ed2a7c7190c 185 LWIP_ASSERT("vb != NULL",vb != NULL);
GordonSin 0:0ed2a7c7190c 186 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 187 {
GordonSin 0:0ed2a7c7190c 188 vb->next = NULL;
GordonSin 0:0ed2a7c7190c 189 vb->prev = NULL;
GordonSin 0:0ed2a7c7190c 190
GordonSin 0:0ed2a7c7190c 191 /* move name from invb to outvb */
GordonSin 0:0ed2a7c7190c 192 vb->ident = msg_ps->vb_ptr->ident;
GordonSin 0:0ed2a7c7190c 193 vb->ident_len = msg_ps->vb_ptr->ident_len;
GordonSin 0:0ed2a7c7190c 194 /* ensure this memory is refereced once only */
GordonSin 0:0ed2a7c7190c 195 msg_ps->vb_ptr->ident = NULL;
GordonSin 0:0ed2a7c7190c 196 msg_ps->vb_ptr->ident_len = 0;
GordonSin 0:0ed2a7c7190c 197
GordonSin 0:0ed2a7c7190c 198 vb->value_type = msg_ps->ext_object_def.asn_type;
GordonSin 0:0ed2a7c7190c 199 LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
GordonSin 0:0ed2a7c7190c 200 vb->value_len = (u8_t)msg_ps->ext_object_def.v_len;
GordonSin 0:0ed2a7c7190c 201 if (vb->value_len > 0)
GordonSin 0:0ed2a7c7190c 202 {
GordonSin 0:0ed2a7c7190c 203 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
GordonSin 0:0ed2a7c7190c 204 vb->value = memp_malloc(MEMP_SNMP_VALUE);
GordonSin 0:0ed2a7c7190c 205 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
GordonSin 0:0ed2a7c7190c 206 if (vb->value != NULL)
GordonSin 0:0ed2a7c7190c 207 {
GordonSin 0:0ed2a7c7190c 208 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
GordonSin 0:0ed2a7c7190c 209 snmp_varbind_tail_add(&msg_ps->outvb, vb);
GordonSin 0:0ed2a7c7190c 210 /* search again (if vb_idx < msg_ps->invb.count) */
GordonSin 0:0ed2a7c7190c 211 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 212 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 213 }
GordonSin 0:0ed2a7c7190c 214 else
GordonSin 0:0ed2a7c7190c 215 {
GordonSin 0:0ed2a7c7190c 216 en->get_value_pc(request_id, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 217 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
GordonSin 0:0ed2a7c7190c 218 msg_ps->vb_ptr->ident = vb->ident;
GordonSin 0:0ed2a7c7190c 219 msg_ps->vb_ptr->ident_len = vb->ident_len;
GordonSin 0:0ed2a7c7190c 220 memp_free(MEMP_SNMP_VARBIND, vb);
GordonSin 0:0ed2a7c7190c 221 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
GordonSin 0:0ed2a7c7190c 222 }
GordonSin 0:0ed2a7c7190c 223 }
GordonSin 0:0ed2a7c7190c 224 else
GordonSin 0:0ed2a7c7190c 225 {
GordonSin 0:0ed2a7c7190c 226 /* vb->value_len == 0, empty value (e.g. empty string) */
GordonSin 0:0ed2a7c7190c 227 en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
GordonSin 0:0ed2a7c7190c 228 vb->value = NULL;
GordonSin 0:0ed2a7c7190c 229 snmp_varbind_tail_add(&msg_ps->outvb, vb);
GordonSin 0:0ed2a7c7190c 230 /* search again (if vb_idx < msg_ps->invb.count) */
GordonSin 0:0ed2a7c7190c 231 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 232 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 233 }
GordonSin 0:0ed2a7c7190c 234 }
GordonSin 0:0ed2a7c7190c 235 else
GordonSin 0:0ed2a7c7190c 236 {
GordonSin 0:0ed2a7c7190c 237 en->get_value_pc(request_id, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 238 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
GordonSin 0:0ed2a7c7190c 239 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
GordonSin 0:0ed2a7c7190c 240 }
GordonSin 0:0ed2a7c7190c 241 }
GordonSin 0:0ed2a7c7190c 242
GordonSin 0:0ed2a7c7190c 243 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
GordonSin 0:0ed2a7c7190c 244 (msg_ps->vb_idx < msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 245 {
GordonSin 0:0ed2a7c7190c 246 struct mib_node *mn;
GordonSin 0:0ed2a7c7190c 247 struct snmp_name_ptr np;
GordonSin 0:0ed2a7c7190c 248
GordonSin 0:0ed2a7c7190c 249 if (msg_ps->vb_idx == 0)
GordonSin 0:0ed2a7c7190c 250 {
GordonSin 0:0ed2a7c7190c 251 msg_ps->vb_ptr = msg_ps->invb.head;
GordonSin 0:0ed2a7c7190c 252 }
GordonSin 0:0ed2a7c7190c 253 else
GordonSin 0:0ed2a7c7190c 254 {
GordonSin 0:0ed2a7c7190c 255 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
GordonSin 0:0ed2a7c7190c 256 }
GordonSin 0:0ed2a7c7190c 257 /** test object identifier for .iso.org.dod.internet prefix */
GordonSin 0:0ed2a7c7190c 258 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
GordonSin 0:0ed2a7c7190c 259 {
GordonSin 0:0ed2a7c7190c 260 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
GordonSin 0:0ed2a7c7190c 261 msg_ps->vb_ptr->ident + 4, &np);
GordonSin 0:0ed2a7c7190c 262 if (mn != NULL)
GordonSin 0:0ed2a7c7190c 263 {
GordonSin 0:0ed2a7c7190c 264 if (mn->node_type == MIB_NODE_EX)
GordonSin 0:0ed2a7c7190c 265 {
GordonSin 0:0ed2a7c7190c 266 /* external object */
GordonSin 0:0ed2a7c7190c 267 struct mib_external_node *en = (struct mib_external_node*)mn;
GordonSin 0:0ed2a7c7190c 268
GordonSin 0:0ed2a7c7190c 269 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
GordonSin 0:0ed2a7c7190c 270 /* save en && args in msg_ps!! */
GordonSin 0:0ed2a7c7190c 271 msg_ps->ext_mib_node = en;
GordonSin 0:0ed2a7c7190c 272 msg_ps->ext_name_ptr = np;
GordonSin 0:0ed2a7c7190c 273
GordonSin 0:0ed2a7c7190c 274 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
GordonSin 0:0ed2a7c7190c 275 }
GordonSin 0:0ed2a7c7190c 276 else
GordonSin 0:0ed2a7c7190c 277 {
GordonSin 0:0ed2a7c7190c 278 /* internal object */
GordonSin 0:0ed2a7c7190c 279 struct obj_def object_def;
GordonSin 0:0ed2a7c7190c 280
GordonSin 0:0ed2a7c7190c 281 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
GordonSin 0:0ed2a7c7190c 282 mn->get_object_def(np.ident_len, np.ident, &object_def);
GordonSin 0:0ed2a7c7190c 283 if ((object_def.instance != MIB_OBJECT_NONE) &&
GordonSin 0:0ed2a7c7190c 284 (object_def.access & MIB_ACCESS_READ))
GordonSin 0:0ed2a7c7190c 285 {
GordonSin 0:0ed2a7c7190c 286 mn = mn;
GordonSin 0:0ed2a7c7190c 287 }
GordonSin 0:0ed2a7c7190c 288 else
GordonSin 0:0ed2a7c7190c 289 {
GordonSin 0:0ed2a7c7190c 290 /* search failed, object id points to unknown object (nosuchname) */
GordonSin 0:0ed2a7c7190c 291 mn = NULL;
GordonSin 0:0ed2a7c7190c 292 }
GordonSin 0:0ed2a7c7190c 293 if (mn != NULL)
GordonSin 0:0ed2a7c7190c 294 {
GordonSin 0:0ed2a7c7190c 295 struct snmp_varbind *vb;
GordonSin 0:0ed2a7c7190c 296
GordonSin 0:0ed2a7c7190c 297 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
GordonSin 0:0ed2a7c7190c 298 /* allocate output varbind */
GordonSin 0:0ed2a7c7190c 299 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
GordonSin 0:0ed2a7c7190c 300 LWIP_ASSERT("vb != NULL",vb != NULL);
GordonSin 0:0ed2a7c7190c 301 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 302 {
GordonSin 0:0ed2a7c7190c 303 vb->next = NULL;
GordonSin 0:0ed2a7c7190c 304 vb->prev = NULL;
GordonSin 0:0ed2a7c7190c 305
GordonSin 0:0ed2a7c7190c 306 /* move name from invb to outvb */
GordonSin 0:0ed2a7c7190c 307 vb->ident = msg_ps->vb_ptr->ident;
GordonSin 0:0ed2a7c7190c 308 vb->ident_len = msg_ps->vb_ptr->ident_len;
GordonSin 0:0ed2a7c7190c 309 /* ensure this memory is refereced once only */
GordonSin 0:0ed2a7c7190c 310 msg_ps->vb_ptr->ident = NULL;
GordonSin 0:0ed2a7c7190c 311 msg_ps->vb_ptr->ident_len = 0;
GordonSin 0:0ed2a7c7190c 312
GordonSin 0:0ed2a7c7190c 313 vb->value_type = object_def.asn_type;
GordonSin 0:0ed2a7c7190c 314 LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
GordonSin 0:0ed2a7c7190c 315 vb->value_len = (u8_t)object_def.v_len;
GordonSin 0:0ed2a7c7190c 316 if (vb->value_len > 0)
GordonSin 0:0ed2a7c7190c 317 {
GordonSin 0:0ed2a7c7190c 318 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low",
GordonSin 0:0ed2a7c7190c 319 vb->value_len <= SNMP_MAX_VALUE_SIZE);
GordonSin 0:0ed2a7c7190c 320 vb->value = memp_malloc(MEMP_SNMP_VALUE);
GordonSin 0:0ed2a7c7190c 321 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
GordonSin 0:0ed2a7c7190c 322 if (vb->value != NULL)
GordonSin 0:0ed2a7c7190c 323 {
GordonSin 0:0ed2a7c7190c 324 mn->get_value(&object_def, vb->value_len, vb->value);
GordonSin 0:0ed2a7c7190c 325 snmp_varbind_tail_add(&msg_ps->outvb, vb);
GordonSin 0:0ed2a7c7190c 326 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 327 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 328 }
GordonSin 0:0ed2a7c7190c 329 else
GordonSin 0:0ed2a7c7190c 330 {
GordonSin 0:0ed2a7c7190c 331 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
GordonSin 0:0ed2a7c7190c 332 msg_ps->vb_ptr->ident = vb->ident;
GordonSin 0:0ed2a7c7190c 333 msg_ps->vb_ptr->ident_len = vb->ident_len;
GordonSin 0:0ed2a7c7190c 334 memp_free(MEMP_SNMP_VARBIND, vb);
GordonSin 0:0ed2a7c7190c 335 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
GordonSin 0:0ed2a7c7190c 336 }
GordonSin 0:0ed2a7c7190c 337 }
GordonSin 0:0ed2a7c7190c 338 else
GordonSin 0:0ed2a7c7190c 339 {
GordonSin 0:0ed2a7c7190c 340 /* vb->value_len == 0, empty value (e.g. empty string) */
GordonSin 0:0ed2a7c7190c 341 vb->value = NULL;
GordonSin 0:0ed2a7c7190c 342 snmp_varbind_tail_add(&msg_ps->outvb, vb);
GordonSin 0:0ed2a7c7190c 343 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 344 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 345 }
GordonSin 0:0ed2a7c7190c 346 }
GordonSin 0:0ed2a7c7190c 347 else
GordonSin 0:0ed2a7c7190c 348 {
GordonSin 0:0ed2a7c7190c 349 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n"));
GordonSin 0:0ed2a7c7190c 350 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
GordonSin 0:0ed2a7c7190c 351 }
GordonSin 0:0ed2a7c7190c 352 }
GordonSin 0:0ed2a7c7190c 353 }
GordonSin 0:0ed2a7c7190c 354 }
GordonSin 0:0ed2a7c7190c 355 }
GordonSin 0:0ed2a7c7190c 356 else
GordonSin 0:0ed2a7c7190c 357 {
GordonSin 0:0ed2a7c7190c 358 mn = NULL;
GordonSin 0:0ed2a7c7190c 359 }
GordonSin 0:0ed2a7c7190c 360 if (mn == NULL)
GordonSin 0:0ed2a7c7190c 361 {
GordonSin 0:0ed2a7c7190c 362 /* mn == NULL, noSuchName */
GordonSin 0:0ed2a7c7190c 363 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 364 }
GordonSin 0:0ed2a7c7190c 365 }
GordonSin 0:0ed2a7c7190c 366 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
GordonSin 0:0ed2a7c7190c 367 (msg_ps->vb_idx == msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 368 {
GordonSin 0:0ed2a7c7190c 369 snmp_ok_response(msg_ps);
GordonSin 0:0ed2a7c7190c 370 }
GordonSin 0:0ed2a7c7190c 371 }
GordonSin 0:0ed2a7c7190c 372
GordonSin 0:0ed2a7c7190c 373 /**
GordonSin 0:0ed2a7c7190c 374 * Service an internal or external event for SNMP GETNEXT.
GordonSin 0:0ed2a7c7190c 375 *
GordonSin 0:0ed2a7c7190c 376 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
GordonSin 0:0ed2a7c7190c 377 * @param msg_ps points to the assosicated message process state
GordonSin 0:0ed2a7c7190c 378 */
GordonSin 0:0ed2a7c7190c 379 static void
GordonSin 0:0ed2a7c7190c 380 snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
GordonSin 0:0ed2a7c7190c 381 {
GordonSin 0:0ed2a7c7190c 382 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
GordonSin 0:0ed2a7c7190c 383
GordonSin 0:0ed2a7c7190c 384 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
GordonSin 0:0ed2a7c7190c 385 {
GordonSin 0:0ed2a7c7190c 386 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 387
GordonSin 0:0ed2a7c7190c 388 /* get_object_def() answer*/
GordonSin 0:0ed2a7c7190c 389 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 390
GordonSin 0:0ed2a7c7190c 391 /* translate answer into a known lifeform */
GordonSin 0:0ed2a7c7190c 392 en->get_object_def_a(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1], &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 393 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
GordonSin 0:0ed2a7c7190c 394 {
GordonSin 0:0ed2a7c7190c 395 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
GordonSin 0:0ed2a7c7190c 396 en->get_value_q(request_id, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 397 }
GordonSin 0:0ed2a7c7190c 398 else
GordonSin 0:0ed2a7c7190c 399 {
GordonSin 0:0ed2a7c7190c 400 en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
GordonSin 0:0ed2a7c7190c 401 /* search failed, object id points to unknown object (nosuchname) */
GordonSin 0:0ed2a7c7190c 402 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 403 }
GordonSin 0:0ed2a7c7190c 404 }
GordonSin 0:0ed2a7c7190c 405 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
GordonSin 0:0ed2a7c7190c 406 {
GordonSin 0:0ed2a7c7190c 407 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 408 struct snmp_varbind *vb;
GordonSin 0:0ed2a7c7190c 409
GordonSin 0:0ed2a7c7190c 410 /* get_value() answer */
GordonSin 0:0ed2a7c7190c 411 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 412
GordonSin 0:0ed2a7c7190c 413 LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
GordonSin 0:0ed2a7c7190c 414 vb = snmp_varbind_alloc(&msg_ps->ext_oid,
GordonSin 0:0ed2a7c7190c 415 msg_ps->ext_object_def.asn_type,
GordonSin 0:0ed2a7c7190c 416 (u8_t)msg_ps->ext_object_def.v_len);
GordonSin 0:0ed2a7c7190c 417 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 418 {
GordonSin 0:0ed2a7c7190c 419 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
GordonSin 0:0ed2a7c7190c 420 snmp_varbind_tail_add(&msg_ps->outvb, vb);
GordonSin 0:0ed2a7c7190c 421 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 422 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 423 }
GordonSin 0:0ed2a7c7190c 424 else
GordonSin 0:0ed2a7c7190c 425 {
GordonSin 0:0ed2a7c7190c 426 en->get_value_pc(request_id, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 427 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
GordonSin 0:0ed2a7c7190c 428 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
GordonSin 0:0ed2a7c7190c 429 }
GordonSin 0:0ed2a7c7190c 430 }
GordonSin 0:0ed2a7c7190c 431
GordonSin 0:0ed2a7c7190c 432 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
GordonSin 0:0ed2a7c7190c 433 (msg_ps->vb_idx < msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 434 {
GordonSin 0:0ed2a7c7190c 435 struct mib_node *mn;
GordonSin 0:0ed2a7c7190c 436 struct snmp_obj_id oid;
GordonSin 0:0ed2a7c7190c 437
GordonSin 0:0ed2a7c7190c 438 if (msg_ps->vb_idx == 0)
GordonSin 0:0ed2a7c7190c 439 {
GordonSin 0:0ed2a7c7190c 440 msg_ps->vb_ptr = msg_ps->invb.head;
GordonSin 0:0ed2a7c7190c 441 }
GordonSin 0:0ed2a7c7190c 442 else
GordonSin 0:0ed2a7c7190c 443 {
GordonSin 0:0ed2a7c7190c 444 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
GordonSin 0:0ed2a7c7190c 445 }
GordonSin 0:0ed2a7c7190c 446 if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
GordonSin 0:0ed2a7c7190c 447 {
GordonSin 0:0ed2a7c7190c 448 if (msg_ps->vb_ptr->ident_len > 3)
GordonSin 0:0ed2a7c7190c 449 {
GordonSin 0:0ed2a7c7190c 450 /* can offset ident_len and ident */
GordonSin 0:0ed2a7c7190c 451 mn = snmp_expand_tree((struct mib_node*)&internet,
GordonSin 0:0ed2a7c7190c 452 msg_ps->vb_ptr->ident_len - 4,
GordonSin 0:0ed2a7c7190c 453 msg_ps->vb_ptr->ident + 4, &oid);
GordonSin 0:0ed2a7c7190c 454 }
GordonSin 0:0ed2a7c7190c 455 else
GordonSin 0:0ed2a7c7190c 456 {
GordonSin 0:0ed2a7c7190c 457 /* can't offset ident_len -4, ident + 4 */
GordonSin 0:0ed2a7c7190c 458 mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid);
GordonSin 0:0ed2a7c7190c 459 }
GordonSin 0:0ed2a7c7190c 460 }
GordonSin 0:0ed2a7c7190c 461 else
GordonSin 0:0ed2a7c7190c 462 {
GordonSin 0:0ed2a7c7190c 463 mn = NULL;
GordonSin 0:0ed2a7c7190c 464 }
GordonSin 0:0ed2a7c7190c 465 if (mn != NULL)
GordonSin 0:0ed2a7c7190c 466 {
GordonSin 0:0ed2a7c7190c 467 if (mn->node_type == MIB_NODE_EX)
GordonSin 0:0ed2a7c7190c 468 {
GordonSin 0:0ed2a7c7190c 469 /* external object */
GordonSin 0:0ed2a7c7190c 470 struct mib_external_node *en = (struct mib_external_node*)mn;
GordonSin 0:0ed2a7c7190c 471
GordonSin 0:0ed2a7c7190c 472 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
GordonSin 0:0ed2a7c7190c 473 /* save en && args in msg_ps!! */
GordonSin 0:0ed2a7c7190c 474 msg_ps->ext_mib_node = en;
GordonSin 0:0ed2a7c7190c 475 msg_ps->ext_oid = oid;
GordonSin 0:0ed2a7c7190c 476
GordonSin 0:0ed2a7c7190c 477 en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]);
GordonSin 0:0ed2a7c7190c 478 }
GordonSin 0:0ed2a7c7190c 479 else
GordonSin 0:0ed2a7c7190c 480 {
GordonSin 0:0ed2a7c7190c 481 /* internal object */
GordonSin 0:0ed2a7c7190c 482 struct obj_def object_def;
GordonSin 0:0ed2a7c7190c 483 struct snmp_varbind *vb;
GordonSin 0:0ed2a7c7190c 484
GordonSin 0:0ed2a7c7190c 485 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
GordonSin 0:0ed2a7c7190c 486 mn->get_object_def(1, &oid.id[oid.len - 1], &object_def);
GordonSin 0:0ed2a7c7190c 487
GordonSin 0:0ed2a7c7190c 488 LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
GordonSin 0:0ed2a7c7190c 489 vb = snmp_varbind_alloc(&oid, object_def.asn_type, (u8_t)object_def.v_len);
GordonSin 0:0ed2a7c7190c 490 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 491 {
GordonSin 0:0ed2a7c7190c 492 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
GordonSin 0:0ed2a7c7190c 493 mn->get_value(&object_def, object_def.v_len, vb->value);
GordonSin 0:0ed2a7c7190c 494 snmp_varbind_tail_add(&msg_ps->outvb, vb);
GordonSin 0:0ed2a7c7190c 495 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 496 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 497 }
GordonSin 0:0ed2a7c7190c 498 else
GordonSin 0:0ed2a7c7190c 499 {
GordonSin 0:0ed2a7c7190c 500 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n"));
GordonSin 0:0ed2a7c7190c 501 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
GordonSin 0:0ed2a7c7190c 502 }
GordonSin 0:0ed2a7c7190c 503 }
GordonSin 0:0ed2a7c7190c 504 }
GordonSin 0:0ed2a7c7190c 505 if (mn == NULL)
GordonSin 0:0ed2a7c7190c 506 {
GordonSin 0:0ed2a7c7190c 507 /* mn == NULL, noSuchName */
GordonSin 0:0ed2a7c7190c 508 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 509 }
GordonSin 0:0ed2a7c7190c 510 }
GordonSin 0:0ed2a7c7190c 511 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
GordonSin 0:0ed2a7c7190c 512 (msg_ps->vb_idx == msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 513 {
GordonSin 0:0ed2a7c7190c 514 snmp_ok_response(msg_ps);
GordonSin 0:0ed2a7c7190c 515 }
GordonSin 0:0ed2a7c7190c 516 }
GordonSin 0:0ed2a7c7190c 517
GordonSin 0:0ed2a7c7190c 518 /**
GordonSin 0:0ed2a7c7190c 519 * Service an internal or external event for SNMP SET.
GordonSin 0:0ed2a7c7190c 520 *
GordonSin 0:0ed2a7c7190c 521 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
GordonSin 0:0ed2a7c7190c 522 * @param msg_ps points to the assosicated message process state
GordonSin 0:0ed2a7c7190c 523 */
GordonSin 0:0ed2a7c7190c 524 static void
GordonSin 0:0ed2a7c7190c 525 snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
GordonSin 0:0ed2a7c7190c 526 {
GordonSin 0:0ed2a7c7190c 527 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
GordonSin 0:0ed2a7c7190c 528
GordonSin 0:0ed2a7c7190c 529 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
GordonSin 0:0ed2a7c7190c 530 {
GordonSin 0:0ed2a7c7190c 531 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 532 struct snmp_name_ptr np;
GordonSin 0:0ed2a7c7190c 533
GordonSin 0:0ed2a7c7190c 534 /* get_object_def() answer*/
GordonSin 0:0ed2a7c7190c 535 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 536 np = msg_ps->ext_name_ptr;
GordonSin 0:0ed2a7c7190c 537
GordonSin 0:0ed2a7c7190c 538 /* translate answer into a known lifeform */
GordonSin 0:0ed2a7c7190c 539 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 540 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
GordonSin 0:0ed2a7c7190c 541 {
GordonSin 0:0ed2a7c7190c 542 msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST;
GordonSin 0:0ed2a7c7190c 543 en->set_test_q(request_id, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 544 }
GordonSin 0:0ed2a7c7190c 545 else
GordonSin 0:0ed2a7c7190c 546 {
GordonSin 0:0ed2a7c7190c 547 en->get_object_def_pc(request_id, np.ident_len, np.ident);
GordonSin 0:0ed2a7c7190c 548 /* search failed, object id points to unknown object (nosuchname) */
GordonSin 0:0ed2a7c7190c 549 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 550 }
GordonSin 0:0ed2a7c7190c 551 }
GordonSin 0:0ed2a7c7190c 552 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST)
GordonSin 0:0ed2a7c7190c 553 {
GordonSin 0:0ed2a7c7190c 554 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 555
GordonSin 0:0ed2a7c7190c 556 /* set_test() answer*/
GordonSin 0:0ed2a7c7190c 557 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 558
GordonSin 0:0ed2a7c7190c 559 if (msg_ps->ext_object_def.access & MIB_ACCESS_WRITE)
GordonSin 0:0ed2a7c7190c 560 {
GordonSin 0:0ed2a7c7190c 561 if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) &&
GordonSin 0:0ed2a7c7190c 562 (en->set_test_a(request_id,&msg_ps->ext_object_def,
GordonSin 0:0ed2a7c7190c 563 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
GordonSin 0:0ed2a7c7190c 564 {
GordonSin 0:0ed2a7c7190c 565 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 566 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 567 }
GordonSin 0:0ed2a7c7190c 568 else
GordonSin 0:0ed2a7c7190c 569 {
GordonSin 0:0ed2a7c7190c 570 en->set_test_pc(request_id,&msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 571 /* bad value */
GordonSin 0:0ed2a7c7190c 572 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
GordonSin 0:0ed2a7c7190c 573 }
GordonSin 0:0ed2a7c7190c 574 }
GordonSin 0:0ed2a7c7190c 575 else
GordonSin 0:0ed2a7c7190c 576 {
GordonSin 0:0ed2a7c7190c 577 en->set_test_pc(request_id,&msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 578 /* object not available for set */
GordonSin 0:0ed2a7c7190c 579 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 580 }
GordonSin 0:0ed2a7c7190c 581 }
GordonSin 0:0ed2a7c7190c 582 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S)
GordonSin 0:0ed2a7c7190c 583 {
GordonSin 0:0ed2a7c7190c 584 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 585 struct snmp_name_ptr np;
GordonSin 0:0ed2a7c7190c 586
GordonSin 0:0ed2a7c7190c 587 /* get_object_def() answer*/
GordonSin 0:0ed2a7c7190c 588 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 589 np = msg_ps->ext_name_ptr;
GordonSin 0:0ed2a7c7190c 590
GordonSin 0:0ed2a7c7190c 591 /* translate answer into a known lifeform */
GordonSin 0:0ed2a7c7190c 592 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
GordonSin 0:0ed2a7c7190c 593 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
GordonSin 0:0ed2a7c7190c 594 {
GordonSin 0:0ed2a7c7190c 595 msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE;
GordonSin 0:0ed2a7c7190c 596 en->set_value_q(request_id, &msg_ps->ext_object_def,
GordonSin 0:0ed2a7c7190c 597 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
GordonSin 0:0ed2a7c7190c 598 }
GordonSin 0:0ed2a7c7190c 599 else
GordonSin 0:0ed2a7c7190c 600 {
GordonSin 0:0ed2a7c7190c 601 en->get_object_def_pc(request_id, np.ident_len, np.ident);
GordonSin 0:0ed2a7c7190c 602 /* set_value failed, object has disappeared for some odd reason?? */
GordonSin 0:0ed2a7c7190c 603 snmp_error_response(msg_ps,SNMP_ES_GENERROR);
GordonSin 0:0ed2a7c7190c 604 }
GordonSin 0:0ed2a7c7190c 605 }
GordonSin 0:0ed2a7c7190c 606 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE)
GordonSin 0:0ed2a7c7190c 607 {
GordonSin 0:0ed2a7c7190c 608 struct mib_external_node *en;
GordonSin 0:0ed2a7c7190c 609
GordonSin 0:0ed2a7c7190c 610 /** set_value_a() */
GordonSin 0:0ed2a7c7190c 611 en = msg_ps->ext_mib_node;
GordonSin 0:0ed2a7c7190c 612 en->set_value_a(request_id, &msg_ps->ext_object_def,
GordonSin 0:0ed2a7c7190c 613 msg_ps->vb_ptr->value_len, msg_ps->vb_ptr->value);
GordonSin 0:0ed2a7c7190c 614
GordonSin 0:0ed2a7c7190c 615 /** @todo use set_value_pc() if toobig */
GordonSin 0:0ed2a7c7190c 616 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
GordonSin 0:0ed2a7c7190c 617 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 618 }
GordonSin 0:0ed2a7c7190c 619
GordonSin 0:0ed2a7c7190c 620 /* test all values before setting */
GordonSin 0:0ed2a7c7190c 621 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
GordonSin 0:0ed2a7c7190c 622 (msg_ps->vb_idx < msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 623 {
GordonSin 0:0ed2a7c7190c 624 struct mib_node *mn;
GordonSin 0:0ed2a7c7190c 625 struct snmp_name_ptr np;
GordonSin 0:0ed2a7c7190c 626
GordonSin 0:0ed2a7c7190c 627 if (msg_ps->vb_idx == 0)
GordonSin 0:0ed2a7c7190c 628 {
GordonSin 0:0ed2a7c7190c 629 msg_ps->vb_ptr = msg_ps->invb.head;
GordonSin 0:0ed2a7c7190c 630 }
GordonSin 0:0ed2a7c7190c 631 else
GordonSin 0:0ed2a7c7190c 632 {
GordonSin 0:0ed2a7c7190c 633 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
GordonSin 0:0ed2a7c7190c 634 }
GordonSin 0:0ed2a7c7190c 635 /** test object identifier for .iso.org.dod.internet prefix */
GordonSin 0:0ed2a7c7190c 636 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
GordonSin 0:0ed2a7c7190c 637 {
GordonSin 0:0ed2a7c7190c 638 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
GordonSin 0:0ed2a7c7190c 639 msg_ps->vb_ptr->ident + 4, &np);
GordonSin 0:0ed2a7c7190c 640 if (mn != NULL)
GordonSin 0:0ed2a7c7190c 641 {
GordonSin 0:0ed2a7c7190c 642 if (mn->node_type == MIB_NODE_EX)
GordonSin 0:0ed2a7c7190c 643 {
GordonSin 0:0ed2a7c7190c 644 /* external object */
GordonSin 0:0ed2a7c7190c 645 struct mib_external_node *en = (struct mib_external_node*)mn;
GordonSin 0:0ed2a7c7190c 646
GordonSin 0:0ed2a7c7190c 647 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
GordonSin 0:0ed2a7c7190c 648 /* save en && args in msg_ps!! */
GordonSin 0:0ed2a7c7190c 649 msg_ps->ext_mib_node = en;
GordonSin 0:0ed2a7c7190c 650 msg_ps->ext_name_ptr = np;
GordonSin 0:0ed2a7c7190c 651
GordonSin 0:0ed2a7c7190c 652 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
GordonSin 0:0ed2a7c7190c 653 }
GordonSin 0:0ed2a7c7190c 654 else
GordonSin 0:0ed2a7c7190c 655 {
GordonSin 0:0ed2a7c7190c 656 /* internal object */
GordonSin 0:0ed2a7c7190c 657 struct obj_def object_def;
GordonSin 0:0ed2a7c7190c 658
GordonSin 0:0ed2a7c7190c 659 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
GordonSin 0:0ed2a7c7190c 660 mn->get_object_def(np.ident_len, np.ident, &object_def);
GordonSin 0:0ed2a7c7190c 661 if (object_def.instance != MIB_OBJECT_NONE)
GordonSin 0:0ed2a7c7190c 662 {
GordonSin 0:0ed2a7c7190c 663 mn = mn;
GordonSin 0:0ed2a7c7190c 664 }
GordonSin 0:0ed2a7c7190c 665 else
GordonSin 0:0ed2a7c7190c 666 {
GordonSin 0:0ed2a7c7190c 667 /* search failed, object id points to unknown object (nosuchname) */
GordonSin 0:0ed2a7c7190c 668 mn = NULL;
GordonSin 0:0ed2a7c7190c 669 }
GordonSin 0:0ed2a7c7190c 670 if (mn != NULL)
GordonSin 0:0ed2a7c7190c 671 {
GordonSin 0:0ed2a7c7190c 672 msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST;
GordonSin 0:0ed2a7c7190c 673
GordonSin 0:0ed2a7c7190c 674 if (object_def.access & MIB_ACCESS_WRITE)
GordonSin 0:0ed2a7c7190c 675 {
GordonSin 0:0ed2a7c7190c 676 if ((object_def.asn_type == msg_ps->vb_ptr->value_type) &&
GordonSin 0:0ed2a7c7190c 677 (mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
GordonSin 0:0ed2a7c7190c 678 {
GordonSin 0:0ed2a7c7190c 679 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 680 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 681 }
GordonSin 0:0ed2a7c7190c 682 else
GordonSin 0:0ed2a7c7190c 683 {
GordonSin 0:0ed2a7c7190c 684 /* bad value */
GordonSin 0:0ed2a7c7190c 685 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
GordonSin 0:0ed2a7c7190c 686 }
GordonSin 0:0ed2a7c7190c 687 }
GordonSin 0:0ed2a7c7190c 688 else
GordonSin 0:0ed2a7c7190c 689 {
GordonSin 0:0ed2a7c7190c 690 /* object not available for set */
GordonSin 0:0ed2a7c7190c 691 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 692 }
GordonSin 0:0ed2a7c7190c 693 }
GordonSin 0:0ed2a7c7190c 694 }
GordonSin 0:0ed2a7c7190c 695 }
GordonSin 0:0ed2a7c7190c 696 }
GordonSin 0:0ed2a7c7190c 697 else
GordonSin 0:0ed2a7c7190c 698 {
GordonSin 0:0ed2a7c7190c 699 mn = NULL;
GordonSin 0:0ed2a7c7190c 700 }
GordonSin 0:0ed2a7c7190c 701 if (mn == NULL)
GordonSin 0:0ed2a7c7190c 702 {
GordonSin 0:0ed2a7c7190c 703 /* mn == NULL, noSuchName */
GordonSin 0:0ed2a7c7190c 704 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
GordonSin 0:0ed2a7c7190c 705 }
GordonSin 0:0ed2a7c7190c 706 }
GordonSin 0:0ed2a7c7190c 707
GordonSin 0:0ed2a7c7190c 708 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
GordonSin 0:0ed2a7c7190c 709 (msg_ps->vb_idx == msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 710 {
GordonSin 0:0ed2a7c7190c 711 msg_ps->vb_idx = 0;
GordonSin 0:0ed2a7c7190c 712 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
GordonSin 0:0ed2a7c7190c 713 }
GordonSin 0:0ed2a7c7190c 714
GordonSin 0:0ed2a7c7190c 715 /* set all values "atomically" (be as "atomic" as possible) */
GordonSin 0:0ed2a7c7190c 716 while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
GordonSin 0:0ed2a7c7190c 717 (msg_ps->vb_idx < msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 718 {
GordonSin 0:0ed2a7c7190c 719 struct mib_node *mn;
GordonSin 0:0ed2a7c7190c 720 struct snmp_name_ptr np;
GordonSin 0:0ed2a7c7190c 721
GordonSin 0:0ed2a7c7190c 722 if (msg_ps->vb_idx == 0)
GordonSin 0:0ed2a7c7190c 723 {
GordonSin 0:0ed2a7c7190c 724 msg_ps->vb_ptr = msg_ps->invb.head;
GordonSin 0:0ed2a7c7190c 725 }
GordonSin 0:0ed2a7c7190c 726 else
GordonSin 0:0ed2a7c7190c 727 {
GordonSin 0:0ed2a7c7190c 728 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
GordonSin 0:0ed2a7c7190c 729 }
GordonSin 0:0ed2a7c7190c 730 /* skip iso prefix test, was done previously while settesting() */
GordonSin 0:0ed2a7c7190c 731 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
GordonSin 0:0ed2a7c7190c 732 msg_ps->vb_ptr->ident + 4, &np);
GordonSin 0:0ed2a7c7190c 733 /* check if object is still available
GordonSin 0:0ed2a7c7190c 734 (e.g. external hot-plug thingy present?) */
GordonSin 0:0ed2a7c7190c 735 if (mn != NULL)
GordonSin 0:0ed2a7c7190c 736 {
GordonSin 0:0ed2a7c7190c 737 if (mn->node_type == MIB_NODE_EX)
GordonSin 0:0ed2a7c7190c 738 {
GordonSin 0:0ed2a7c7190c 739 /* external object */
GordonSin 0:0ed2a7c7190c 740 struct mib_external_node *en = (struct mib_external_node*)mn;
GordonSin 0:0ed2a7c7190c 741
GordonSin 0:0ed2a7c7190c 742 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S;
GordonSin 0:0ed2a7c7190c 743 /* save en && args in msg_ps!! */
GordonSin 0:0ed2a7c7190c 744 msg_ps->ext_mib_node = en;
GordonSin 0:0ed2a7c7190c 745 msg_ps->ext_name_ptr = np;
GordonSin 0:0ed2a7c7190c 746
GordonSin 0:0ed2a7c7190c 747 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
GordonSin 0:0ed2a7c7190c 748 }
GordonSin 0:0ed2a7c7190c 749 else
GordonSin 0:0ed2a7c7190c 750 {
GordonSin 0:0ed2a7c7190c 751 /* internal object */
GordonSin 0:0ed2a7c7190c 752 struct obj_def object_def;
GordonSin 0:0ed2a7c7190c 753
GordonSin 0:0ed2a7c7190c 754 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S;
GordonSin 0:0ed2a7c7190c 755 mn->get_object_def(np.ident_len, np.ident, &object_def);
GordonSin 0:0ed2a7c7190c 756 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
GordonSin 0:0ed2a7c7190c 757 mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
GordonSin 0:0ed2a7c7190c 758 msg_ps->vb_idx += 1;
GordonSin 0:0ed2a7c7190c 759 }
GordonSin 0:0ed2a7c7190c 760 }
GordonSin 0:0ed2a7c7190c 761 }
GordonSin 0:0ed2a7c7190c 762 if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
GordonSin 0:0ed2a7c7190c 763 (msg_ps->vb_idx == msg_ps->invb.count))
GordonSin 0:0ed2a7c7190c 764 {
GordonSin 0:0ed2a7c7190c 765 /* simply echo the input if we can set it
GordonSin 0:0ed2a7c7190c 766 @todo do we need to return the actual value?
GordonSin 0:0ed2a7c7190c 767 e.g. if value is silently modified or behaves sticky? */
GordonSin 0:0ed2a7c7190c 768 msg_ps->outvb = msg_ps->invb;
GordonSin 0:0ed2a7c7190c 769 msg_ps->invb.head = NULL;
GordonSin 0:0ed2a7c7190c 770 msg_ps->invb.tail = NULL;
GordonSin 0:0ed2a7c7190c 771 msg_ps->invb.count = 0;
GordonSin 0:0ed2a7c7190c 772 snmp_ok_response(msg_ps);
GordonSin 0:0ed2a7c7190c 773 }
GordonSin 0:0ed2a7c7190c 774 }
GordonSin 0:0ed2a7c7190c 775
GordonSin 0:0ed2a7c7190c 776
GordonSin 0:0ed2a7c7190c 777 /**
GordonSin 0:0ed2a7c7190c 778 * Handle one internal or external event.
GordonSin 0:0ed2a7c7190c 779 * Called for one async event. (recv external/private answer)
GordonSin 0:0ed2a7c7190c 780 *
GordonSin 0:0ed2a7c7190c 781 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
GordonSin 0:0ed2a7c7190c 782 */
GordonSin 0:0ed2a7c7190c 783 void
GordonSin 0:0ed2a7c7190c 784 snmp_msg_event(u8_t request_id)
GordonSin 0:0ed2a7c7190c 785 {
GordonSin 0:0ed2a7c7190c 786 struct snmp_msg_pstat *msg_ps;
GordonSin 0:0ed2a7c7190c 787
GordonSin 0:0ed2a7c7190c 788 if (request_id < SNMP_CONCURRENT_REQUESTS)
GordonSin 0:0ed2a7c7190c 789 {
GordonSin 0:0ed2a7c7190c 790 msg_ps = &msg_input_list[request_id];
GordonSin 0:0ed2a7c7190c 791 if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ)
GordonSin 0:0ed2a7c7190c 792 {
GordonSin 0:0ed2a7c7190c 793 snmp_msg_getnext_event(request_id, msg_ps);
GordonSin 0:0ed2a7c7190c 794 }
GordonSin 0:0ed2a7c7190c 795 else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ)
GordonSin 0:0ed2a7c7190c 796 {
GordonSin 0:0ed2a7c7190c 797 snmp_msg_get_event(request_id, msg_ps);
GordonSin 0:0ed2a7c7190c 798 }
GordonSin 0:0ed2a7c7190c 799 else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)
GordonSin 0:0ed2a7c7190c 800 {
GordonSin 0:0ed2a7c7190c 801 snmp_msg_set_event(request_id, msg_ps);
GordonSin 0:0ed2a7c7190c 802 }
GordonSin 0:0ed2a7c7190c 803 }
GordonSin 0:0ed2a7c7190c 804 }
GordonSin 0:0ed2a7c7190c 805
GordonSin 0:0ed2a7c7190c 806
GordonSin 0:0ed2a7c7190c 807 /* lwIP UDP receive callback function */
GordonSin 0:0ed2a7c7190c 808 static void
GordonSin 0:0ed2a7c7190c 809 snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
GordonSin 0:0ed2a7c7190c 810 {
GordonSin 0:0ed2a7c7190c 811 struct snmp_msg_pstat *msg_ps;
GordonSin 0:0ed2a7c7190c 812 u8_t req_idx;
GordonSin 0:0ed2a7c7190c 813 err_t err_ret;
GordonSin 0:0ed2a7c7190c 814 u16_t payload_len = p->tot_len;
GordonSin 0:0ed2a7c7190c 815 u16_t payload_ofs = 0;
GordonSin 0:0ed2a7c7190c 816 u16_t varbind_ofs = 0;
GordonSin 0:0ed2a7c7190c 817
GordonSin 0:0ed2a7c7190c 818 /* suppress unused argument warning */
GordonSin 0:0ed2a7c7190c 819 LWIP_UNUSED_ARG(arg);
GordonSin 0:0ed2a7c7190c 820
GordonSin 0:0ed2a7c7190c 821 /* traverse input message process list, look for SNMP_MSG_EMPTY */
GordonSin 0:0ed2a7c7190c 822 msg_ps = &msg_input_list[0];
GordonSin 0:0ed2a7c7190c 823 req_idx = 0;
GordonSin 0:0ed2a7c7190c 824 while ((req_idx < SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY))
GordonSin 0:0ed2a7c7190c 825 {
GordonSin 0:0ed2a7c7190c 826 req_idx++;
GordonSin 0:0ed2a7c7190c 827 msg_ps++;
GordonSin 0:0ed2a7c7190c 828 }
GordonSin 0:0ed2a7c7190c 829 if (req_idx == SNMP_CONCURRENT_REQUESTS)
GordonSin 0:0ed2a7c7190c 830 {
GordonSin 0:0ed2a7c7190c 831 /* exceeding number of concurrent requests */
GordonSin 0:0ed2a7c7190c 832 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 833 return;
GordonSin 0:0ed2a7c7190c 834 }
GordonSin 0:0ed2a7c7190c 835
GordonSin 0:0ed2a7c7190c 836 /* accepting request */
GordonSin 0:0ed2a7c7190c 837 snmp_inc_snmpinpkts();
GordonSin 0:0ed2a7c7190c 838 /* record used 'protocol control block' */
GordonSin 0:0ed2a7c7190c 839 msg_ps->pcb = pcb;
GordonSin 0:0ed2a7c7190c 840 /* source address (network order) */
GordonSin 0:0ed2a7c7190c 841 msg_ps->sip = *addr;
GordonSin 0:0ed2a7c7190c 842 /* source port (host order (lwIP oddity)) */
GordonSin 0:0ed2a7c7190c 843 msg_ps->sp = port;
GordonSin 0:0ed2a7c7190c 844
GordonSin 0:0ed2a7c7190c 845 /* check total length, version, community, pdu type */
GordonSin 0:0ed2a7c7190c 846 err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
GordonSin 0:0ed2a7c7190c 847 /* Only accept requests and requests without error (be robust) */
GordonSin 0:0ed2a7c7190c 848 /* Reject response and trap headers or error requests as input! */
GordonSin 0:0ed2a7c7190c 849 if ((err_ret != ERR_OK) ||
GordonSin 0:0ed2a7c7190c 850 ((msg_ps->rt != SNMP_ASN1_PDU_GET_REQ) &&
GordonSin 0:0ed2a7c7190c 851 (msg_ps->rt != SNMP_ASN1_PDU_GET_NEXT_REQ) &&
GordonSin 0:0ed2a7c7190c 852 (msg_ps->rt != SNMP_ASN1_PDU_SET_REQ)) ||
GordonSin 0:0ed2a7c7190c 853 ((msg_ps->error_status != SNMP_ES_NOERROR) ||
GordonSin 0:0ed2a7c7190c 854 (msg_ps->error_index != 0)) )
GordonSin 0:0ed2a7c7190c 855 {
GordonSin 0:0ed2a7c7190c 856 /* header check failed drop request silently, do not return error! */
GordonSin 0:0ed2a7c7190c 857 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 858 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
GordonSin 0:0ed2a7c7190c 859 return;
GordonSin 0:0ed2a7c7190c 860 }
GordonSin 0:0ed2a7c7190c 861 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
GordonSin 0:0ed2a7c7190c 862
GordonSin 0:0ed2a7c7190c 863 /* Builds a list of variable bindings. Copy the varbinds from the pbuf
GordonSin 0:0ed2a7c7190c 864 chain to glue them when these are divided over two or more pbuf's. */
GordonSin 0:0ed2a7c7190c 865 err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
GordonSin 0:0ed2a7c7190c 866 /* we've decoded the incoming message, release input msg now */
GordonSin 0:0ed2a7c7190c 867 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 868 if ((err_ret != ERR_OK) || (msg_ps->invb.count == 0))
GordonSin 0:0ed2a7c7190c 869 {
GordonSin 0:0ed2a7c7190c 870 /* varbind-list decode failed, or varbind list empty.
GordonSin 0:0ed2a7c7190c 871 drop request silently, do not return error!
GordonSin 0:0ed2a7c7190c 872 (errors are only returned for a specific varbind failure) */
GordonSin 0:0ed2a7c7190c 873 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
GordonSin 0:0ed2a7c7190c 874 return;
GordonSin 0:0ed2a7c7190c 875 }
GordonSin 0:0ed2a7c7190c 876
GordonSin 0:0ed2a7c7190c 877 msg_ps->error_status = SNMP_ES_NOERROR;
GordonSin 0:0ed2a7c7190c 878 msg_ps->error_index = 0;
GordonSin 0:0ed2a7c7190c 879 /* find object for each variable binding */
GordonSin 0:0ed2a7c7190c 880 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
GordonSin 0:0ed2a7c7190c 881 /* first variable binding from list to inspect */
GordonSin 0:0ed2a7c7190c 882 msg_ps->vb_idx = 0;
GordonSin 0:0ed2a7c7190c 883
GordonSin 0:0ed2a7c7190c 884 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
GordonSin 0:0ed2a7c7190c 885
GordonSin 0:0ed2a7c7190c 886 /* handle input event and as much objects as possible in one go */
GordonSin 0:0ed2a7c7190c 887 snmp_msg_event(req_idx);
GordonSin 0:0ed2a7c7190c 888 }
GordonSin 0:0ed2a7c7190c 889
GordonSin 0:0ed2a7c7190c 890 /**
GordonSin 0:0ed2a7c7190c 891 * Checks and decodes incoming SNMP message header, logs header errors.
GordonSin 0:0ed2a7c7190c 892 *
GordonSin 0:0ed2a7c7190c 893 * @param p points to pbuf chain of SNMP message (UDP payload)
GordonSin 0:0ed2a7c7190c 894 * @param ofs points to first octet of SNMP message
GordonSin 0:0ed2a7c7190c 895 * @param pdu_len the length of the UDP payload
GordonSin 0:0ed2a7c7190c 896 * @param ofs_ret returns the ofset of the variable bindings
GordonSin 0:0ed2a7c7190c 897 * @param m_stat points to the current message request state return
GordonSin 0:0ed2a7c7190c 898 * @return
GordonSin 0:0ed2a7c7190c 899 * - ERR_OK SNMP header is sane and accepted
GordonSin 0:0ed2a7c7190c 900 * - ERR_ARG SNMP header is either malformed or rejected
GordonSin 0:0ed2a7c7190c 901 */
GordonSin 0:0ed2a7c7190c 902 static err_t
GordonSin 0:0ed2a7c7190c 903 snmp_pdu_header_check(struct pbuf *p, u16_t ofs, u16_t pdu_len, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
GordonSin 0:0ed2a7c7190c 904 {
GordonSin 0:0ed2a7c7190c 905 err_t derr;
GordonSin 0:0ed2a7c7190c 906 u16_t len, ofs_base;
GordonSin 0:0ed2a7c7190c 907 u8_t len_octets;
GordonSin 0:0ed2a7c7190c 908 u8_t type;
GordonSin 0:0ed2a7c7190c 909 s32_t version;
GordonSin 0:0ed2a7c7190c 910
GordonSin 0:0ed2a7c7190c 911 ofs_base = ofs;
GordonSin 0:0ed2a7c7190c 912 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 913 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 914 if ((derr != ERR_OK) ||
GordonSin 0:0ed2a7c7190c 915 (pdu_len != (1 + len_octets + len)) ||
GordonSin 0:0ed2a7c7190c 916 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
GordonSin 0:0ed2a7c7190c 917 {
GordonSin 0:0ed2a7c7190c 918 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 919 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 920 }
GordonSin 0:0ed2a7c7190c 921 ofs += (1 + len_octets);
GordonSin 0:0ed2a7c7190c 922 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 923 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 924 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
GordonSin 0:0ed2a7c7190c 925 {
GordonSin 0:0ed2a7c7190c 926 /* can't decode or no integer (version) */
GordonSin 0:0ed2a7c7190c 927 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 928 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 929 }
GordonSin 0:0ed2a7c7190c 930 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version);
GordonSin 0:0ed2a7c7190c 931 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 932 {
GordonSin 0:0ed2a7c7190c 933 /* can't decode */
GordonSin 0:0ed2a7c7190c 934 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 935 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 936 }
GordonSin 0:0ed2a7c7190c 937 if (version != 0)
GordonSin 0:0ed2a7c7190c 938 {
GordonSin 0:0ed2a7c7190c 939 /* not version 1 */
GordonSin 0:0ed2a7c7190c 940 snmp_inc_snmpinbadversions();
GordonSin 0:0ed2a7c7190c 941 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 942 }
GordonSin 0:0ed2a7c7190c 943 ofs += (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 944 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 945 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 946 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)))
GordonSin 0:0ed2a7c7190c 947 {
GordonSin 0:0ed2a7c7190c 948 /* can't decode or no octet string (community) */
GordonSin 0:0ed2a7c7190c 949 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 950 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 951 }
GordonSin 0:0ed2a7c7190c 952 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community);
GordonSin 0:0ed2a7c7190c 953 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 954 {
GordonSin 0:0ed2a7c7190c 955 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 956 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 957 }
GordonSin 0:0ed2a7c7190c 958 /* add zero terminator */
GordonSin 0:0ed2a7c7190c 959 len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN));
GordonSin 0:0ed2a7c7190c 960 m_stat->community[len] = 0;
GordonSin 0:0ed2a7c7190c 961 m_stat->com_strlen = (u8_t)len;
GordonSin 0:0ed2a7c7190c 962 if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0)
GordonSin 0:0ed2a7c7190c 963 {
GordonSin 0:0ed2a7c7190c 964 /** @todo: move this if we need to check more names */
GordonSin 0:0ed2a7c7190c 965 snmp_inc_snmpinbadcommunitynames();
GordonSin 0:0ed2a7c7190c 966 snmp_authfail_trap();
GordonSin 0:0ed2a7c7190c 967 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 968 }
GordonSin 0:0ed2a7c7190c 969 ofs += (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 970 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 971 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 972 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 973 {
GordonSin 0:0ed2a7c7190c 974 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 975 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 976 }
GordonSin 0:0ed2a7c7190c 977 switch(type)
GordonSin 0:0ed2a7c7190c 978 {
GordonSin 0:0ed2a7c7190c 979 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ):
GordonSin 0:0ed2a7c7190c 980 /* GetRequest PDU */
GordonSin 0:0ed2a7c7190c 981 snmp_inc_snmpingetrequests();
GordonSin 0:0ed2a7c7190c 982 derr = ERR_OK;
GordonSin 0:0ed2a7c7190c 983 break;
GordonSin 0:0ed2a7c7190c 984 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ):
GordonSin 0:0ed2a7c7190c 985 /* GetNextRequest PDU */
GordonSin 0:0ed2a7c7190c 986 snmp_inc_snmpingetnexts();
GordonSin 0:0ed2a7c7190c 987 derr = ERR_OK;
GordonSin 0:0ed2a7c7190c 988 break;
GordonSin 0:0ed2a7c7190c 989 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP):
GordonSin 0:0ed2a7c7190c 990 /* GetResponse PDU */
GordonSin 0:0ed2a7c7190c 991 snmp_inc_snmpingetresponses();
GordonSin 0:0ed2a7c7190c 992 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 993 break;
GordonSin 0:0ed2a7c7190c 994 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ):
GordonSin 0:0ed2a7c7190c 995 /* SetRequest PDU */
GordonSin 0:0ed2a7c7190c 996 snmp_inc_snmpinsetrequests();
GordonSin 0:0ed2a7c7190c 997 derr = ERR_OK;
GordonSin 0:0ed2a7c7190c 998 break;
GordonSin 0:0ed2a7c7190c 999 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP):
GordonSin 0:0ed2a7c7190c 1000 /* Trap PDU */
GordonSin 0:0ed2a7c7190c 1001 snmp_inc_snmpintraps();
GordonSin 0:0ed2a7c7190c 1002 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1003 break;
GordonSin 0:0ed2a7c7190c 1004 default:
GordonSin 0:0ed2a7c7190c 1005 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1006 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1007 break;
GordonSin 0:0ed2a7c7190c 1008 }
GordonSin 0:0ed2a7c7190c 1009 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 1010 {
GordonSin 0:0ed2a7c7190c 1011 /* unsupported input PDU for this agent (no parse error) */
GordonSin 0:0ed2a7c7190c 1012 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1013 }
GordonSin 0:0ed2a7c7190c 1014 m_stat->rt = type & 0x1F;
GordonSin 0:0ed2a7c7190c 1015 ofs += (1 + len_octets);
GordonSin 0:0ed2a7c7190c 1016 if (len != (pdu_len - (ofs - ofs_base)))
GordonSin 0:0ed2a7c7190c 1017 {
GordonSin 0:0ed2a7c7190c 1018 /* decoded PDU length does not equal actual payload length */
GordonSin 0:0ed2a7c7190c 1019 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1020 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1021 }
GordonSin 0:0ed2a7c7190c 1022 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 1023 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 1024 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
GordonSin 0:0ed2a7c7190c 1025 {
GordonSin 0:0ed2a7c7190c 1026 /* can't decode or no integer (request ID) */
GordonSin 0:0ed2a7c7190c 1027 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1028 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1029 }
GordonSin 0:0ed2a7c7190c 1030 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid);
GordonSin 0:0ed2a7c7190c 1031 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 1032 {
GordonSin 0:0ed2a7c7190c 1033 /* can't decode */
GordonSin 0:0ed2a7c7190c 1034 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1035 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1036 }
GordonSin 0:0ed2a7c7190c 1037 ofs += (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 1038 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 1039 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 1040 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
GordonSin 0:0ed2a7c7190c 1041 {
GordonSin 0:0ed2a7c7190c 1042 /* can't decode or no integer (error-status) */
GordonSin 0:0ed2a7c7190c 1043 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1044 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1045 }
GordonSin 0:0ed2a7c7190c 1046 /* must be noError (0) for incoming requests.
GordonSin 0:0ed2a7c7190c 1047 log errors for mib-2 completeness and for debug purposes */
GordonSin 0:0ed2a7c7190c 1048 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status);
GordonSin 0:0ed2a7c7190c 1049 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 1050 {
GordonSin 0:0ed2a7c7190c 1051 /* can't decode */
GordonSin 0:0ed2a7c7190c 1052 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1053 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1054 }
GordonSin 0:0ed2a7c7190c 1055 switch (m_stat->error_status)
GordonSin 0:0ed2a7c7190c 1056 {
GordonSin 0:0ed2a7c7190c 1057 case SNMP_ES_TOOBIG:
GordonSin 0:0ed2a7c7190c 1058 snmp_inc_snmpintoobigs();
GordonSin 0:0ed2a7c7190c 1059 break;
GordonSin 0:0ed2a7c7190c 1060 case SNMP_ES_NOSUCHNAME:
GordonSin 0:0ed2a7c7190c 1061 snmp_inc_snmpinnosuchnames();
GordonSin 0:0ed2a7c7190c 1062 break;
GordonSin 0:0ed2a7c7190c 1063 case SNMP_ES_BADVALUE:
GordonSin 0:0ed2a7c7190c 1064 snmp_inc_snmpinbadvalues();
GordonSin 0:0ed2a7c7190c 1065 break;
GordonSin 0:0ed2a7c7190c 1066 case SNMP_ES_READONLY:
GordonSin 0:0ed2a7c7190c 1067 snmp_inc_snmpinreadonlys();
GordonSin 0:0ed2a7c7190c 1068 break;
GordonSin 0:0ed2a7c7190c 1069 case SNMP_ES_GENERROR:
GordonSin 0:0ed2a7c7190c 1070 snmp_inc_snmpingenerrs();
GordonSin 0:0ed2a7c7190c 1071 break;
GordonSin 0:0ed2a7c7190c 1072 }
GordonSin 0:0ed2a7c7190c 1073 ofs += (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 1074 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 1075 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 1076 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
GordonSin 0:0ed2a7c7190c 1077 {
GordonSin 0:0ed2a7c7190c 1078 /* can't decode or no integer (error-index) */
GordonSin 0:0ed2a7c7190c 1079 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1080 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1081 }
GordonSin 0:0ed2a7c7190c 1082 /* must be 0 for incoming requests.
GordonSin 0:0ed2a7c7190c 1083 decode anyway to catch bad integers (and dirty tricks) */
GordonSin 0:0ed2a7c7190c 1084 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index);
GordonSin 0:0ed2a7c7190c 1085 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 1086 {
GordonSin 0:0ed2a7c7190c 1087 /* can't decode */
GordonSin 0:0ed2a7c7190c 1088 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1089 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1090 }
GordonSin 0:0ed2a7c7190c 1091 ofs += (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 1092 *ofs_ret = ofs;
GordonSin 0:0ed2a7c7190c 1093 return ERR_OK;
GordonSin 0:0ed2a7c7190c 1094 }
GordonSin 0:0ed2a7c7190c 1095
GordonSin 0:0ed2a7c7190c 1096 static err_t
GordonSin 0:0ed2a7c7190c 1097 snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
GordonSin 0:0ed2a7c7190c 1098 {
GordonSin 0:0ed2a7c7190c 1099 err_t derr;
GordonSin 0:0ed2a7c7190c 1100 u16_t len, vb_len;
GordonSin 0:0ed2a7c7190c 1101 u8_t len_octets;
GordonSin 0:0ed2a7c7190c 1102 u8_t type;
GordonSin 0:0ed2a7c7190c 1103
GordonSin 0:0ed2a7c7190c 1104 /* variable binding list */
GordonSin 0:0ed2a7c7190c 1105 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 1106 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len);
GordonSin 0:0ed2a7c7190c 1107 if ((derr != ERR_OK) ||
GordonSin 0:0ed2a7c7190c 1108 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
GordonSin 0:0ed2a7c7190c 1109 {
GordonSin 0:0ed2a7c7190c 1110 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1111 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1112 }
GordonSin 0:0ed2a7c7190c 1113 ofs += (1 + len_octets);
GordonSin 0:0ed2a7c7190c 1114
GordonSin 0:0ed2a7c7190c 1115 /* start with empty list */
GordonSin 0:0ed2a7c7190c 1116 m_stat->invb.count = 0;
GordonSin 0:0ed2a7c7190c 1117 m_stat->invb.head = NULL;
GordonSin 0:0ed2a7c7190c 1118 m_stat->invb.tail = NULL;
GordonSin 0:0ed2a7c7190c 1119
GordonSin 0:0ed2a7c7190c 1120 while (vb_len > 0)
GordonSin 0:0ed2a7c7190c 1121 {
GordonSin 0:0ed2a7c7190c 1122 struct snmp_obj_id oid, oid_value;
GordonSin 0:0ed2a7c7190c 1123 struct snmp_varbind *vb;
GordonSin 0:0ed2a7c7190c 1124
GordonSin 0:0ed2a7c7190c 1125 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 1126 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 1127 if ((derr != ERR_OK) ||
GordonSin 0:0ed2a7c7190c 1128 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) ||
GordonSin 0:0ed2a7c7190c 1129 (len == 0) || (len > vb_len))
GordonSin 0:0ed2a7c7190c 1130 {
GordonSin 0:0ed2a7c7190c 1131 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1132 /* free varbinds (if available) */
GordonSin 0:0ed2a7c7190c 1133 snmp_varbind_list_free(&m_stat->invb);
GordonSin 0:0ed2a7c7190c 1134 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1135 }
GordonSin 0:0ed2a7c7190c 1136 ofs += (1 + len_octets);
GordonSin 0:0ed2a7c7190c 1137 vb_len -= (1 + len_octets);
GordonSin 0:0ed2a7c7190c 1138
GordonSin 0:0ed2a7c7190c 1139 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 1140 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 1141 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)))
GordonSin 0:0ed2a7c7190c 1142 {
GordonSin 0:0ed2a7c7190c 1143 /* can't decode object name length */
GordonSin 0:0ed2a7c7190c 1144 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1145 /* free varbinds (if available) */
GordonSin 0:0ed2a7c7190c 1146 snmp_varbind_list_free(&m_stat->invb);
GordonSin 0:0ed2a7c7190c 1147 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1148 }
GordonSin 0:0ed2a7c7190c 1149 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid);
GordonSin 0:0ed2a7c7190c 1150 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 1151 {
GordonSin 0:0ed2a7c7190c 1152 /* can't decode object name */
GordonSin 0:0ed2a7c7190c 1153 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1154 /* free varbinds (if available) */
GordonSin 0:0ed2a7c7190c 1155 snmp_varbind_list_free(&m_stat->invb);
GordonSin 0:0ed2a7c7190c 1156 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1157 }
GordonSin 0:0ed2a7c7190c 1158 ofs += (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 1159 vb_len -= (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 1160
GordonSin 0:0ed2a7c7190c 1161 snmp_asn1_dec_type(p, ofs, &type);
GordonSin 0:0ed2a7c7190c 1162 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
GordonSin 0:0ed2a7c7190c 1163 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 1164 {
GordonSin 0:0ed2a7c7190c 1165 /* can't decode object value length */
GordonSin 0:0ed2a7c7190c 1166 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1167 /* free varbinds (if available) */
GordonSin 0:0ed2a7c7190c 1168 snmp_varbind_list_free(&m_stat->invb);
GordonSin 0:0ed2a7c7190c 1169 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1170 }
GordonSin 0:0ed2a7c7190c 1171
GordonSin 0:0ed2a7c7190c 1172 switch (type)
GordonSin 0:0ed2a7c7190c 1173 {
GordonSin 0:0ed2a7c7190c 1174 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
GordonSin 0:0ed2a7c7190c 1175 vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t));
GordonSin 0:0ed2a7c7190c 1176 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 1177 {
GordonSin 0:0ed2a7c7190c 1178 s32_t *vptr = (s32_t*)vb->value;
GordonSin 0:0ed2a7c7190c 1179
GordonSin 0:0ed2a7c7190c 1180 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr);
GordonSin 0:0ed2a7c7190c 1181 snmp_varbind_tail_add(&m_stat->invb, vb);
GordonSin 0:0ed2a7c7190c 1182 }
GordonSin 0:0ed2a7c7190c 1183 else
GordonSin 0:0ed2a7c7190c 1184 {
GordonSin 0:0ed2a7c7190c 1185 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1186 }
GordonSin 0:0ed2a7c7190c 1187 break;
GordonSin 0:0ed2a7c7190c 1188 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
GordonSin 0:0ed2a7c7190c 1189 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
GordonSin 0:0ed2a7c7190c 1190 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
GordonSin 0:0ed2a7c7190c 1191 vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t));
GordonSin 0:0ed2a7c7190c 1192 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 1193 {
GordonSin 0:0ed2a7c7190c 1194 u32_t *vptr = (u32_t*)vb->value;
GordonSin 0:0ed2a7c7190c 1195
GordonSin 0:0ed2a7c7190c 1196 derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr);
GordonSin 0:0ed2a7c7190c 1197 snmp_varbind_tail_add(&m_stat->invb, vb);
GordonSin 0:0ed2a7c7190c 1198 }
GordonSin 0:0ed2a7c7190c 1199 else
GordonSin 0:0ed2a7c7190c 1200 {
GordonSin 0:0ed2a7c7190c 1201 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1202 }
GordonSin 0:0ed2a7c7190c 1203 break;
GordonSin 0:0ed2a7c7190c 1204 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
GordonSin 0:0ed2a7c7190c 1205 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
GordonSin 0:0ed2a7c7190c 1206 LWIP_ASSERT("invalid length", len <= 0xff);
GordonSin 0:0ed2a7c7190c 1207 vb = snmp_varbind_alloc(&oid, type, (u8_t)len);
GordonSin 0:0ed2a7c7190c 1208 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 1209 {
GordonSin 0:0ed2a7c7190c 1210 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
GordonSin 0:0ed2a7c7190c 1211 snmp_varbind_tail_add(&m_stat->invb, vb);
GordonSin 0:0ed2a7c7190c 1212 }
GordonSin 0:0ed2a7c7190c 1213 else
GordonSin 0:0ed2a7c7190c 1214 {
GordonSin 0:0ed2a7c7190c 1215 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1216 }
GordonSin 0:0ed2a7c7190c 1217 break;
GordonSin 0:0ed2a7c7190c 1218 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
GordonSin 0:0ed2a7c7190c 1219 vb = snmp_varbind_alloc(&oid, type, 0);
GordonSin 0:0ed2a7c7190c 1220 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 1221 {
GordonSin 0:0ed2a7c7190c 1222 snmp_varbind_tail_add(&m_stat->invb, vb);
GordonSin 0:0ed2a7c7190c 1223 derr = ERR_OK;
GordonSin 0:0ed2a7c7190c 1224 }
GordonSin 0:0ed2a7c7190c 1225 else
GordonSin 0:0ed2a7c7190c 1226 {
GordonSin 0:0ed2a7c7190c 1227 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1228 }
GordonSin 0:0ed2a7c7190c 1229 break;
GordonSin 0:0ed2a7c7190c 1230 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
GordonSin 0:0ed2a7c7190c 1231 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value);
GordonSin 0:0ed2a7c7190c 1232 if (derr == ERR_OK)
GordonSin 0:0ed2a7c7190c 1233 {
GordonSin 0:0ed2a7c7190c 1234 vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t));
GordonSin 0:0ed2a7c7190c 1235 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 1236 {
GordonSin 0:0ed2a7c7190c 1237 u8_t i = oid_value.len;
GordonSin 0:0ed2a7c7190c 1238 s32_t *vptr = (s32_t*)vb->value;
GordonSin 0:0ed2a7c7190c 1239
GordonSin 0:0ed2a7c7190c 1240 while(i > 0)
GordonSin 0:0ed2a7c7190c 1241 {
GordonSin 0:0ed2a7c7190c 1242 i--;
GordonSin 0:0ed2a7c7190c 1243 vptr[i] = oid_value.id[i];
GordonSin 0:0ed2a7c7190c 1244 }
GordonSin 0:0ed2a7c7190c 1245 snmp_varbind_tail_add(&m_stat->invb, vb);
GordonSin 0:0ed2a7c7190c 1246 derr = ERR_OK;
GordonSin 0:0ed2a7c7190c 1247 }
GordonSin 0:0ed2a7c7190c 1248 else
GordonSin 0:0ed2a7c7190c 1249 {
GordonSin 0:0ed2a7c7190c 1250 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1251 }
GordonSin 0:0ed2a7c7190c 1252 }
GordonSin 0:0ed2a7c7190c 1253 break;
GordonSin 0:0ed2a7c7190c 1254 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
GordonSin 0:0ed2a7c7190c 1255 if (len == 4)
GordonSin 0:0ed2a7c7190c 1256 {
GordonSin 0:0ed2a7c7190c 1257 /* must be exactly 4 octets! */
GordonSin 0:0ed2a7c7190c 1258 vb = snmp_varbind_alloc(&oid, type, 4);
GordonSin 0:0ed2a7c7190c 1259 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 1260 {
GordonSin 0:0ed2a7c7190c 1261 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
GordonSin 0:0ed2a7c7190c 1262 snmp_varbind_tail_add(&m_stat->invb, vb);
GordonSin 0:0ed2a7c7190c 1263 }
GordonSin 0:0ed2a7c7190c 1264 else
GordonSin 0:0ed2a7c7190c 1265 {
GordonSin 0:0ed2a7c7190c 1266 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1267 }
GordonSin 0:0ed2a7c7190c 1268 }
GordonSin 0:0ed2a7c7190c 1269 else
GordonSin 0:0ed2a7c7190c 1270 {
GordonSin 0:0ed2a7c7190c 1271 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1272 }
GordonSin 0:0ed2a7c7190c 1273 break;
GordonSin 0:0ed2a7c7190c 1274 default:
GordonSin 0:0ed2a7c7190c 1275 derr = ERR_ARG;
GordonSin 0:0ed2a7c7190c 1276 break;
GordonSin 0:0ed2a7c7190c 1277 }
GordonSin 0:0ed2a7c7190c 1278 if (derr != ERR_OK)
GordonSin 0:0ed2a7c7190c 1279 {
GordonSin 0:0ed2a7c7190c 1280 snmp_inc_snmpinasnparseerrs();
GordonSin 0:0ed2a7c7190c 1281 /* free varbinds (if available) */
GordonSin 0:0ed2a7c7190c 1282 snmp_varbind_list_free(&m_stat->invb);
GordonSin 0:0ed2a7c7190c 1283 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 1284 }
GordonSin 0:0ed2a7c7190c 1285 ofs += (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 1286 vb_len -= (1 + len_octets + len);
GordonSin 0:0ed2a7c7190c 1287 }
GordonSin 0:0ed2a7c7190c 1288
GordonSin 0:0ed2a7c7190c 1289 if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ)
GordonSin 0:0ed2a7c7190c 1290 {
GordonSin 0:0ed2a7c7190c 1291 snmp_add_snmpintotalsetvars(m_stat->invb.count);
GordonSin 0:0ed2a7c7190c 1292 }
GordonSin 0:0ed2a7c7190c 1293 else
GordonSin 0:0ed2a7c7190c 1294 {
GordonSin 0:0ed2a7c7190c 1295 snmp_add_snmpintotalreqvars(m_stat->invb.count);
GordonSin 0:0ed2a7c7190c 1296 }
GordonSin 0:0ed2a7c7190c 1297
GordonSin 0:0ed2a7c7190c 1298 *ofs_ret = ofs;
GordonSin 0:0ed2a7c7190c 1299 return ERR_OK;
GordonSin 0:0ed2a7c7190c 1300 }
GordonSin 0:0ed2a7c7190c 1301
GordonSin 0:0ed2a7c7190c 1302 struct snmp_varbind*
GordonSin 0:0ed2a7c7190c 1303 snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
GordonSin 0:0ed2a7c7190c 1304 {
GordonSin 0:0ed2a7c7190c 1305 struct snmp_varbind *vb;
GordonSin 0:0ed2a7c7190c 1306
GordonSin 0:0ed2a7c7190c 1307 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
GordonSin 0:0ed2a7c7190c 1308 LWIP_ASSERT("vb != NULL",vb != NULL);
GordonSin 0:0ed2a7c7190c 1309 if (vb != NULL)
GordonSin 0:0ed2a7c7190c 1310 {
GordonSin 0:0ed2a7c7190c 1311 u8_t i;
GordonSin 0:0ed2a7c7190c 1312
GordonSin 0:0ed2a7c7190c 1313 vb->next = NULL;
GordonSin 0:0ed2a7c7190c 1314 vb->prev = NULL;
GordonSin 0:0ed2a7c7190c 1315 i = oid->len;
GordonSin 0:0ed2a7c7190c 1316 vb->ident_len = i;
GordonSin 0:0ed2a7c7190c 1317 if (i > 0)
GordonSin 0:0ed2a7c7190c 1318 {
GordonSin 0:0ed2a7c7190c 1319 LWIP_ASSERT("SNMP_MAX_TREE_DEPTH is configured too low", i <= SNMP_MAX_TREE_DEPTH);
GordonSin 0:0ed2a7c7190c 1320 /* allocate array of s32_t for our object identifier */
GordonSin 0:0ed2a7c7190c 1321 vb->ident = (s32_t*)memp_malloc(MEMP_SNMP_VALUE);
GordonSin 0:0ed2a7c7190c 1322 LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL);
GordonSin 0:0ed2a7c7190c 1323 if (vb->ident == NULL)
GordonSin 0:0ed2a7c7190c 1324 {
GordonSin 0:0ed2a7c7190c 1325 memp_free(MEMP_SNMP_VARBIND, vb);
GordonSin 0:0ed2a7c7190c 1326 return NULL;
GordonSin 0:0ed2a7c7190c 1327 }
GordonSin 0:0ed2a7c7190c 1328 while(i > 0)
GordonSin 0:0ed2a7c7190c 1329 {
GordonSin 0:0ed2a7c7190c 1330 i--;
GordonSin 0:0ed2a7c7190c 1331 vb->ident[i] = oid->id[i];
GordonSin 0:0ed2a7c7190c 1332 }
GordonSin 0:0ed2a7c7190c 1333 }
GordonSin 0:0ed2a7c7190c 1334 else
GordonSin 0:0ed2a7c7190c 1335 {
GordonSin 0:0ed2a7c7190c 1336 /* i == 0, pass zero length object identifier */
GordonSin 0:0ed2a7c7190c 1337 vb->ident = NULL;
GordonSin 0:0ed2a7c7190c 1338 }
GordonSin 0:0ed2a7c7190c 1339 vb->value_type = type;
GordonSin 0:0ed2a7c7190c 1340 vb->value_len = len;
GordonSin 0:0ed2a7c7190c 1341 if (len > 0)
GordonSin 0:0ed2a7c7190c 1342 {
GordonSin 0:0ed2a7c7190c 1343 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
GordonSin 0:0ed2a7c7190c 1344 /* allocate raw bytes for our object value */
GordonSin 0:0ed2a7c7190c 1345 vb->value = memp_malloc(MEMP_SNMP_VALUE);
GordonSin 0:0ed2a7c7190c 1346 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
GordonSin 0:0ed2a7c7190c 1347 if (vb->value == NULL)
GordonSin 0:0ed2a7c7190c 1348 {
GordonSin 0:0ed2a7c7190c 1349 if (vb->ident != NULL)
GordonSin 0:0ed2a7c7190c 1350 {
GordonSin 0:0ed2a7c7190c 1351 memp_free(MEMP_SNMP_VALUE, vb->ident);
GordonSin 0:0ed2a7c7190c 1352 }
GordonSin 0:0ed2a7c7190c 1353 memp_free(MEMP_SNMP_VARBIND, vb);
GordonSin 0:0ed2a7c7190c 1354 return NULL;
GordonSin 0:0ed2a7c7190c 1355 }
GordonSin 0:0ed2a7c7190c 1356 }
GordonSin 0:0ed2a7c7190c 1357 else
GordonSin 0:0ed2a7c7190c 1358 {
GordonSin 0:0ed2a7c7190c 1359 /* ASN1_NUL type, or zero length ASN1_OC_STR */
GordonSin 0:0ed2a7c7190c 1360 vb->value = NULL;
GordonSin 0:0ed2a7c7190c 1361 }
GordonSin 0:0ed2a7c7190c 1362 }
GordonSin 0:0ed2a7c7190c 1363 return vb;
GordonSin 0:0ed2a7c7190c 1364 }
GordonSin 0:0ed2a7c7190c 1365
GordonSin 0:0ed2a7c7190c 1366 void
GordonSin 0:0ed2a7c7190c 1367 snmp_varbind_free(struct snmp_varbind *vb)
GordonSin 0:0ed2a7c7190c 1368 {
GordonSin 0:0ed2a7c7190c 1369 if (vb->value != NULL )
GordonSin 0:0ed2a7c7190c 1370 {
GordonSin 0:0ed2a7c7190c 1371 memp_free(MEMP_SNMP_VALUE, vb->value);
GordonSin 0:0ed2a7c7190c 1372 }
GordonSin 0:0ed2a7c7190c 1373 if (vb->ident != NULL )
GordonSin 0:0ed2a7c7190c 1374 {
GordonSin 0:0ed2a7c7190c 1375 memp_free(MEMP_SNMP_VALUE, vb->ident);
GordonSin 0:0ed2a7c7190c 1376 }
GordonSin 0:0ed2a7c7190c 1377 memp_free(MEMP_SNMP_VARBIND, vb);
GordonSin 0:0ed2a7c7190c 1378 }
GordonSin 0:0ed2a7c7190c 1379
GordonSin 0:0ed2a7c7190c 1380 void
GordonSin 0:0ed2a7c7190c 1381 snmp_varbind_list_free(struct snmp_varbind_root *root)
GordonSin 0:0ed2a7c7190c 1382 {
GordonSin 0:0ed2a7c7190c 1383 struct snmp_varbind *vb, *prev;
GordonSin 0:0ed2a7c7190c 1384
GordonSin 0:0ed2a7c7190c 1385 vb = root->tail;
GordonSin 0:0ed2a7c7190c 1386 while ( vb != NULL )
GordonSin 0:0ed2a7c7190c 1387 {
GordonSin 0:0ed2a7c7190c 1388 prev = vb->prev;
GordonSin 0:0ed2a7c7190c 1389 snmp_varbind_free(vb);
GordonSin 0:0ed2a7c7190c 1390 vb = prev;
GordonSin 0:0ed2a7c7190c 1391 }
GordonSin 0:0ed2a7c7190c 1392 root->count = 0;
GordonSin 0:0ed2a7c7190c 1393 root->head = NULL;
GordonSin 0:0ed2a7c7190c 1394 root->tail = NULL;
GordonSin 0:0ed2a7c7190c 1395 }
GordonSin 0:0ed2a7c7190c 1396
GordonSin 0:0ed2a7c7190c 1397 void
GordonSin 0:0ed2a7c7190c 1398 snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb)
GordonSin 0:0ed2a7c7190c 1399 {
GordonSin 0:0ed2a7c7190c 1400 if (root->count == 0)
GordonSin 0:0ed2a7c7190c 1401 {
GordonSin 0:0ed2a7c7190c 1402 /* add first varbind to list */
GordonSin 0:0ed2a7c7190c 1403 root->head = vb;
GordonSin 0:0ed2a7c7190c 1404 root->tail = vb;
GordonSin 0:0ed2a7c7190c 1405 }
GordonSin 0:0ed2a7c7190c 1406 else
GordonSin 0:0ed2a7c7190c 1407 {
GordonSin 0:0ed2a7c7190c 1408 /* add nth varbind to list tail */
GordonSin 0:0ed2a7c7190c 1409 root->tail->next = vb;
GordonSin 0:0ed2a7c7190c 1410 vb->prev = root->tail;
GordonSin 0:0ed2a7c7190c 1411 root->tail = vb;
GordonSin 0:0ed2a7c7190c 1412 }
GordonSin 0:0ed2a7c7190c 1413 root->count += 1;
GordonSin 0:0ed2a7c7190c 1414 }
GordonSin 0:0ed2a7c7190c 1415
GordonSin 0:0ed2a7c7190c 1416 struct snmp_varbind*
GordonSin 0:0ed2a7c7190c 1417 snmp_varbind_tail_remove(struct snmp_varbind_root *root)
GordonSin 0:0ed2a7c7190c 1418 {
GordonSin 0:0ed2a7c7190c 1419 struct snmp_varbind* vb;
GordonSin 0:0ed2a7c7190c 1420
GordonSin 0:0ed2a7c7190c 1421 if (root->count > 0)
GordonSin 0:0ed2a7c7190c 1422 {
GordonSin 0:0ed2a7c7190c 1423 /* remove tail varbind */
GordonSin 0:0ed2a7c7190c 1424 vb = root->tail;
GordonSin 0:0ed2a7c7190c 1425 root->tail = vb->prev;
GordonSin 0:0ed2a7c7190c 1426 vb->prev->next = NULL;
GordonSin 0:0ed2a7c7190c 1427 root->count -= 1;
GordonSin 0:0ed2a7c7190c 1428 }
GordonSin 0:0ed2a7c7190c 1429 else
GordonSin 0:0ed2a7c7190c 1430 {
GordonSin 0:0ed2a7c7190c 1431 /* nothing to remove */
GordonSin 0:0ed2a7c7190c 1432 vb = NULL;
GordonSin 0:0ed2a7c7190c 1433 }
GordonSin 0:0ed2a7c7190c 1434 return vb;
GordonSin 0:0ed2a7c7190c 1435 }
GordonSin 0:0ed2a7c7190c 1436
GordonSin 0:0ed2a7c7190c 1437 #endif /* LWIP_SNMP */