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lwip/core/snmp/msg_in.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * SNMP input message processing (RFC1157).
grzemich 0:d7bd7384a37c 4 */
grzemich 0:d7bd7384a37c 5
grzemich 0:d7bd7384a37c 6 /*
grzemich 0:d7bd7384a37c 7 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
grzemich 0:d7bd7384a37c 8 * All rights reserved.
grzemich 0:d7bd7384a37c 9 *
grzemich 0:d7bd7384a37c 10 * Redistribution and use in source and binary forms, with or without modification,
grzemich 0:d7bd7384a37c 11 * are permitted provided that the following conditions are met:
grzemich 0:d7bd7384a37c 12 *
grzemich 0:d7bd7384a37c 13 * 1. Redistributions of source code must retain the above copyright notice,
grzemich 0:d7bd7384a37c 14 * this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
grzemich 0:d7bd7384a37c 16 * this list of conditions and the following disclaimer in the documentation
grzemich 0:d7bd7384a37c 17 * and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 18 * 3. The name of the author may not be used to endorse or promote products
grzemich 0:d7bd7384a37c 19 * derived from this software without specific prior written permission.
grzemich 0:d7bd7384a37c 20 *
grzemich 0:d7bd7384a37c 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
grzemich 0:d7bd7384a37c 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
grzemich 0:d7bd7384a37c 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
grzemich 0:d7bd7384a37c 24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
grzemich 0:d7bd7384a37c 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
grzemich 0:d7bd7384a37c 26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
grzemich 0:d7bd7384a37c 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
grzemich 0:d7bd7384a37c 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
grzemich 0:d7bd7384a37c 29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
grzemich 0:d7bd7384a37c 30 * OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 31 *
grzemich 0:d7bd7384a37c 32 * Author: Christiaan Simons <christiaan.simons@axon.tv>
grzemich 0:d7bd7384a37c 33 */
grzemich 0:d7bd7384a37c 34
grzemich 0:d7bd7384a37c 35 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 36
grzemich 0:d7bd7384a37c 37 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 38
grzemich 0:d7bd7384a37c 39 #include "lwip/snmp.h"
grzemich 0:d7bd7384a37c 40 #include "lwip/snmp_asn1.h"
grzemich 0:d7bd7384a37c 41 #include "lwip/snmp_msg.h"
grzemich 0:d7bd7384a37c 42 #include "lwip/snmp_structs.h"
grzemich 0:d7bd7384a37c 43 #include "lwip/ip_addr.h"
grzemich 0:d7bd7384a37c 44 #include "lwip/memp.h"
grzemich 0:d7bd7384a37c 45 #include "lwip/udp.h"
grzemich 0:d7bd7384a37c 46 #include "lwip/stats.h"
grzemich 0:d7bd7384a37c 47
grzemich 0:d7bd7384a37c 48 #include <string.h>
grzemich 0:d7bd7384a37c 49
grzemich 0:d7bd7384a37c 50 /* public (non-static) constants */
grzemich 0:d7bd7384a37c 51 /** SNMP v1 == 0 */
grzemich 0:d7bd7384a37c 52 const s32_t snmp_version = 0;
grzemich 0:d7bd7384a37c 53 /** default SNMP community string */
grzemich 0:d7bd7384a37c 54 const char snmp_publiccommunity[7] = "public";
grzemich 0:d7bd7384a37c 55
grzemich 0:d7bd7384a37c 56 /* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
grzemich 0:d7bd7384a37c 57 struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
grzemich 0:d7bd7384a37c 58 /* UDP Protocol Control Block */
grzemich 0:d7bd7384a37c 59 struct udp_pcb *snmp1_pcb;
grzemich 0:d7bd7384a37c 60
grzemich 0:d7bd7384a37c 61 static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
grzemich 0:d7bd7384a37c 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);
grzemich 0:d7bd7384a37c 63 static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
grzemich 0:d7bd7384a37c 64
grzemich 0:d7bd7384a37c 65
grzemich 0:d7bd7384a37c 66 /**
grzemich 0:d7bd7384a37c 67 * Starts SNMP Agent.
grzemich 0:d7bd7384a37c 68 * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
grzemich 0:d7bd7384a37c 69 */
grzemich 0:d7bd7384a37c 70 void
grzemich 0:d7bd7384a37c 71 snmp_init(void)
grzemich 0:d7bd7384a37c 72 {
grzemich 0:d7bd7384a37c 73 struct snmp_msg_pstat *msg_ps;
grzemich 0:d7bd7384a37c 74 u8_t i;
grzemich 0:d7bd7384a37c 75
grzemich 0:d7bd7384a37c 76 snmp1_pcb = udp_new();
grzemich 0:d7bd7384a37c 77 if (snmp1_pcb != NULL)
grzemich 0:d7bd7384a37c 78 {
grzemich 0:d7bd7384a37c 79 udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
grzemich 0:d7bd7384a37c 80 udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
grzemich 0:d7bd7384a37c 81 }
grzemich 0:d7bd7384a37c 82 msg_ps = &msg_input_list[0];
grzemich 0:d7bd7384a37c 83 for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
grzemich 0:d7bd7384a37c 84 {
grzemich 0:d7bd7384a37c 85 msg_ps->state = SNMP_MSG_EMPTY;
grzemich 0:d7bd7384a37c 86 msg_ps->error_index = 0;
grzemich 0:d7bd7384a37c 87 msg_ps->error_status = SNMP_ES_NOERROR;
grzemich 0:d7bd7384a37c 88 msg_ps++;
grzemich 0:d7bd7384a37c 89 }
grzemich 0:d7bd7384a37c 90 trap_msg.pcb = snmp1_pcb;
grzemich 0:d7bd7384a37c 91
grzemich 0:d7bd7384a37c 92 #ifdef SNMP_PRIVATE_MIB_INIT
grzemich 0:d7bd7384a37c 93 /* If defined, rhis must be a function-like define to initialize the
grzemich 0:d7bd7384a37c 94 * private MIB after the stack has been initialized.
grzemich 0:d7bd7384a37c 95 * The private MIB can also be initialized in tcpip_callback (or after
grzemich 0:d7bd7384a37c 96 * the stack is initialized), this define is only for convenience. */
grzemich 0:d7bd7384a37c 97 SNMP_PRIVATE_MIB_INIT();
grzemich 0:d7bd7384a37c 98 #endif /* SNMP_PRIVATE_MIB_INIT */
grzemich 0:d7bd7384a37c 99
grzemich 0:d7bd7384a37c 100 /* The coldstart trap will only be output
grzemich 0:d7bd7384a37c 101 if our outgoing interface is up & configured */
grzemich 0:d7bd7384a37c 102 snmp_coldstart_trap();
grzemich 0:d7bd7384a37c 103 }
grzemich 0:d7bd7384a37c 104
grzemich 0:d7bd7384a37c 105 static void
grzemich 0:d7bd7384a37c 106 snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
grzemich 0:d7bd7384a37c 107 {
grzemich 0:d7bd7384a37c 108 snmp_varbind_list_free(&msg_ps->outvb);
grzemich 0:d7bd7384a37c 109 msg_ps->outvb = msg_ps->invb;
grzemich 0:d7bd7384a37c 110 msg_ps->invb.head = NULL;
grzemich 0:d7bd7384a37c 111 msg_ps->invb.tail = NULL;
grzemich 0:d7bd7384a37c 112 msg_ps->invb.count = 0;
grzemich 0:d7bd7384a37c 113 msg_ps->error_status = error;
grzemich 0:d7bd7384a37c 114 msg_ps->error_index = 1 + msg_ps->vb_idx;
grzemich 0:d7bd7384a37c 115 snmp_send_response(msg_ps);
grzemich 0:d7bd7384a37c 116 snmp_varbind_list_free(&msg_ps->outvb);
grzemich 0:d7bd7384a37c 117 msg_ps->state = SNMP_MSG_EMPTY;
grzemich 0:d7bd7384a37c 118 }
grzemich 0:d7bd7384a37c 119
grzemich 0:d7bd7384a37c 120 static void
grzemich 0:d7bd7384a37c 121 snmp_ok_response(struct snmp_msg_pstat *msg_ps)
grzemich 0:d7bd7384a37c 122 {
grzemich 0:d7bd7384a37c 123 err_t err_ret;
grzemich 0:d7bd7384a37c 124
grzemich 0:d7bd7384a37c 125 err_ret = snmp_send_response(msg_ps);
grzemich 0:d7bd7384a37c 126 if (err_ret == ERR_MEM)
grzemich 0:d7bd7384a37c 127 {
grzemich 0:d7bd7384a37c 128 /* serious memory problem, can't return tooBig */
grzemich 0:d7bd7384a37c 129 }
grzemich 0:d7bd7384a37c 130 else
grzemich 0:d7bd7384a37c 131 {
grzemich 0:d7bd7384a37c 132 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
grzemich 0:d7bd7384a37c 133 }
grzemich 0:d7bd7384a37c 134 /* free varbinds (if available) */
grzemich 0:d7bd7384a37c 135 snmp_varbind_list_free(&msg_ps->invb);
grzemich 0:d7bd7384a37c 136 snmp_varbind_list_free(&msg_ps->outvb);
grzemich 0:d7bd7384a37c 137 msg_ps->state = SNMP_MSG_EMPTY;
grzemich 0:d7bd7384a37c 138 }
grzemich 0:d7bd7384a37c 139
grzemich 0:d7bd7384a37c 140 /**
grzemich 0:d7bd7384a37c 141 * Service an internal or external event for SNMP GET.
grzemich 0:d7bd7384a37c 142 *
grzemich 0:d7bd7384a37c 143 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
grzemich 0:d7bd7384a37c 144 * @param msg_ps points to the assosicated message process state
grzemich 0:d7bd7384a37c 145 */
grzemich 0:d7bd7384a37c 146 static void
grzemich 0:d7bd7384a37c 147 snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
grzemich 0:d7bd7384a37c 148 {
grzemich 0:d7bd7384a37c 149 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
grzemich 0:d7bd7384a37c 150
grzemich 0:d7bd7384a37c 151 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
grzemich 0:d7bd7384a37c 152 {
grzemich 0:d7bd7384a37c 153 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 154 struct snmp_name_ptr np;
grzemich 0:d7bd7384a37c 155
grzemich 0:d7bd7384a37c 156 /* get_object_def() answer*/
grzemich 0:d7bd7384a37c 157 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 158 np = msg_ps->ext_name_ptr;
grzemich 0:d7bd7384a37c 159
grzemich 0:d7bd7384a37c 160 /* translate answer into a known lifeform */
grzemich 0:d7bd7384a37c 161 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 162 if ((msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) &&
grzemich 0:d7bd7384a37c 163 (msg_ps->ext_object_def.access & MIB_ACCESS_READ))
grzemich 0:d7bd7384a37c 164 {
grzemich 0:d7bd7384a37c 165 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
grzemich 0:d7bd7384a37c 166 en->get_value_q(request_id, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 167 }
grzemich 0:d7bd7384a37c 168 else
grzemich 0:d7bd7384a37c 169 {
grzemich 0:d7bd7384a37c 170 en->get_object_def_pc(request_id, np.ident_len, np.ident);
grzemich 0:d7bd7384a37c 171 /* search failed, object id points to unknown object (nosuchname) */
grzemich 0:d7bd7384a37c 172 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 173 }
grzemich 0:d7bd7384a37c 174 }
grzemich 0:d7bd7384a37c 175 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
grzemich 0:d7bd7384a37c 176 {
grzemich 0:d7bd7384a37c 177 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 178 struct snmp_varbind *vb;
grzemich 0:d7bd7384a37c 179
grzemich 0:d7bd7384a37c 180 /* get_value() answer */
grzemich 0:d7bd7384a37c 181 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 182
grzemich 0:d7bd7384a37c 183 /* allocate output varbind */
grzemich 0:d7bd7384a37c 184 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
grzemich 0:d7bd7384a37c 185 LWIP_ASSERT("vb != NULL",vb != NULL);
grzemich 0:d7bd7384a37c 186 if (vb != NULL)
grzemich 0:d7bd7384a37c 187 {
grzemich 0:d7bd7384a37c 188 vb->next = NULL;
grzemich 0:d7bd7384a37c 189 vb->prev = NULL;
grzemich 0:d7bd7384a37c 190
grzemich 0:d7bd7384a37c 191 /* move name from invb to outvb */
grzemich 0:d7bd7384a37c 192 vb->ident = msg_ps->vb_ptr->ident;
grzemich 0:d7bd7384a37c 193 vb->ident_len = msg_ps->vb_ptr->ident_len;
grzemich 0:d7bd7384a37c 194 /* ensure this memory is refereced once only */
grzemich 0:d7bd7384a37c 195 msg_ps->vb_ptr->ident = NULL;
grzemich 0:d7bd7384a37c 196 msg_ps->vb_ptr->ident_len = 0;
grzemich 0:d7bd7384a37c 197
grzemich 0:d7bd7384a37c 198 vb->value_type = msg_ps->ext_object_def.asn_type;
grzemich 0:d7bd7384a37c 199 LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
grzemich 0:d7bd7384a37c 200 vb->value_len = (u8_t)msg_ps->ext_object_def.v_len;
grzemich 0:d7bd7384a37c 201 if (vb->value_len > 0)
grzemich 0:d7bd7384a37c 202 {
grzemich 0:d7bd7384a37c 203 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
grzemich 0:d7bd7384a37c 204 vb->value = memp_malloc(MEMP_SNMP_VALUE);
grzemich 0:d7bd7384a37c 205 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
grzemich 0:d7bd7384a37c 206 if (vb->value != NULL)
grzemich 0:d7bd7384a37c 207 {
grzemich 0:d7bd7384a37c 208 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
grzemich 0:d7bd7384a37c 209 snmp_varbind_tail_add(&msg_ps->outvb, vb);
grzemich 0:d7bd7384a37c 210 /* search again (if vb_idx < msg_ps->invb.count) */
grzemich 0:d7bd7384a37c 211 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 212 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 213 }
grzemich 0:d7bd7384a37c 214 else
grzemich 0:d7bd7384a37c 215 {
grzemich 0:d7bd7384a37c 216 en->get_value_pc(request_id, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 217 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
grzemich 0:d7bd7384a37c 218 msg_ps->vb_ptr->ident = vb->ident;
grzemich 0:d7bd7384a37c 219 msg_ps->vb_ptr->ident_len = vb->ident_len;
grzemich 0:d7bd7384a37c 220 memp_free(MEMP_SNMP_VARBIND, vb);
grzemich 0:d7bd7384a37c 221 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
grzemich 0:d7bd7384a37c 222 }
grzemich 0:d7bd7384a37c 223 }
grzemich 0:d7bd7384a37c 224 else
grzemich 0:d7bd7384a37c 225 {
grzemich 0:d7bd7384a37c 226 /* vb->value_len == 0, empty value (e.g. empty string) */
grzemich 0:d7bd7384a37c 227 en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
grzemich 0:d7bd7384a37c 228 vb->value = NULL;
grzemich 0:d7bd7384a37c 229 snmp_varbind_tail_add(&msg_ps->outvb, vb);
grzemich 0:d7bd7384a37c 230 /* search again (if vb_idx < msg_ps->invb.count) */
grzemich 0:d7bd7384a37c 231 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 232 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 233 }
grzemich 0:d7bd7384a37c 234 }
grzemich 0:d7bd7384a37c 235 else
grzemich 0:d7bd7384a37c 236 {
grzemich 0:d7bd7384a37c 237 en->get_value_pc(request_id, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 238 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
grzemich 0:d7bd7384a37c 239 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
grzemich 0:d7bd7384a37c 240 }
grzemich 0:d7bd7384a37c 241 }
grzemich 0:d7bd7384a37c 242
grzemich 0:d7bd7384a37c 243 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
grzemich 0:d7bd7384a37c 244 (msg_ps->vb_idx < msg_ps->invb.count))
grzemich 0:d7bd7384a37c 245 {
grzemich 0:d7bd7384a37c 246 struct mib_node *mn;
grzemich 0:d7bd7384a37c 247 struct snmp_name_ptr np;
grzemich 0:d7bd7384a37c 248
grzemich 0:d7bd7384a37c 249 if (msg_ps->vb_idx == 0)
grzemich 0:d7bd7384a37c 250 {
grzemich 0:d7bd7384a37c 251 msg_ps->vb_ptr = msg_ps->invb.head;
grzemich 0:d7bd7384a37c 252 }
grzemich 0:d7bd7384a37c 253 else
grzemich 0:d7bd7384a37c 254 {
grzemich 0:d7bd7384a37c 255 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
grzemich 0:d7bd7384a37c 256 }
grzemich 0:d7bd7384a37c 257 /** test object identifier for .iso.org.dod.internet prefix */
grzemich 0:d7bd7384a37c 258 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
grzemich 0:d7bd7384a37c 259 {
grzemich 0:d7bd7384a37c 260 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
grzemich 0:d7bd7384a37c 261 msg_ps->vb_ptr->ident + 4, &np);
grzemich 0:d7bd7384a37c 262 if (mn != NULL)
grzemich 0:d7bd7384a37c 263 {
grzemich 0:d7bd7384a37c 264 if (mn->node_type == MIB_NODE_EX)
grzemich 0:d7bd7384a37c 265 {
grzemich 0:d7bd7384a37c 266 /* external object */
grzemich 0:d7bd7384a37c 267 struct mib_external_node *en = (struct mib_external_node*)mn;
grzemich 0:d7bd7384a37c 268
grzemich 0:d7bd7384a37c 269 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
grzemich 0:d7bd7384a37c 270 /* save en && args in msg_ps!! */
grzemich 0:d7bd7384a37c 271 msg_ps->ext_mib_node = en;
grzemich 0:d7bd7384a37c 272 msg_ps->ext_name_ptr = np;
grzemich 0:d7bd7384a37c 273
grzemich 0:d7bd7384a37c 274 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
grzemich 0:d7bd7384a37c 275 }
grzemich 0:d7bd7384a37c 276 else
grzemich 0:d7bd7384a37c 277 {
grzemich 0:d7bd7384a37c 278 /* internal object */
grzemich 0:d7bd7384a37c 279 struct obj_def object_def;
grzemich 0:d7bd7384a37c 280
grzemich 0:d7bd7384a37c 281 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
grzemich 0:d7bd7384a37c 282 mn->get_object_def(np.ident_len, np.ident, &object_def);
grzemich 0:d7bd7384a37c 283 if ((object_def.instance != MIB_OBJECT_NONE) &&
grzemich 0:d7bd7384a37c 284 (object_def.access & MIB_ACCESS_READ))
grzemich 0:d7bd7384a37c 285 {
grzemich 0:d7bd7384a37c 286 mn = mn;
grzemich 0:d7bd7384a37c 287 }
grzemich 0:d7bd7384a37c 288 else
grzemich 0:d7bd7384a37c 289 {
grzemich 0:d7bd7384a37c 290 /* search failed, object id points to unknown object (nosuchname) */
grzemich 0:d7bd7384a37c 291 mn = NULL;
grzemich 0:d7bd7384a37c 292 }
grzemich 0:d7bd7384a37c 293 if (mn != NULL)
grzemich 0:d7bd7384a37c 294 {
grzemich 0:d7bd7384a37c 295 struct snmp_varbind *vb;
grzemich 0:d7bd7384a37c 296
grzemich 0:d7bd7384a37c 297 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
grzemich 0:d7bd7384a37c 298 /* allocate output varbind */
grzemich 0:d7bd7384a37c 299 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
grzemich 0:d7bd7384a37c 300 LWIP_ASSERT("vb != NULL",vb != NULL);
grzemich 0:d7bd7384a37c 301 if (vb != NULL)
grzemich 0:d7bd7384a37c 302 {
grzemich 0:d7bd7384a37c 303 vb->next = NULL;
grzemich 0:d7bd7384a37c 304 vb->prev = NULL;
grzemich 0:d7bd7384a37c 305
grzemich 0:d7bd7384a37c 306 /* move name from invb to outvb */
grzemich 0:d7bd7384a37c 307 vb->ident = msg_ps->vb_ptr->ident;
grzemich 0:d7bd7384a37c 308 vb->ident_len = msg_ps->vb_ptr->ident_len;
grzemich 0:d7bd7384a37c 309 /* ensure this memory is refereced once only */
grzemich 0:d7bd7384a37c 310 msg_ps->vb_ptr->ident = NULL;
grzemich 0:d7bd7384a37c 311 msg_ps->vb_ptr->ident_len = 0;
grzemich 0:d7bd7384a37c 312
grzemich 0:d7bd7384a37c 313 vb->value_type = object_def.asn_type;
grzemich 0:d7bd7384a37c 314 LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
grzemich 0:d7bd7384a37c 315 vb->value_len = (u8_t)object_def.v_len;
grzemich 0:d7bd7384a37c 316 if (vb->value_len > 0)
grzemich 0:d7bd7384a37c 317 {
grzemich 0:d7bd7384a37c 318 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low",
grzemich 0:d7bd7384a37c 319 vb->value_len <= SNMP_MAX_VALUE_SIZE);
grzemich 0:d7bd7384a37c 320 vb->value = memp_malloc(MEMP_SNMP_VALUE);
grzemich 0:d7bd7384a37c 321 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
grzemich 0:d7bd7384a37c 322 if (vb->value != NULL)
grzemich 0:d7bd7384a37c 323 {
grzemich 0:d7bd7384a37c 324 mn->get_value(&object_def, vb->value_len, vb->value);
grzemich 0:d7bd7384a37c 325 snmp_varbind_tail_add(&msg_ps->outvb, vb);
grzemich 0:d7bd7384a37c 326 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 327 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 328 }
grzemich 0:d7bd7384a37c 329 else
grzemich 0:d7bd7384a37c 330 {
grzemich 0:d7bd7384a37c 331 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
grzemich 0:d7bd7384a37c 332 msg_ps->vb_ptr->ident = vb->ident;
grzemich 0:d7bd7384a37c 333 msg_ps->vb_ptr->ident_len = vb->ident_len;
grzemich 0:d7bd7384a37c 334 memp_free(MEMP_SNMP_VARBIND, vb);
grzemich 0:d7bd7384a37c 335 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
grzemich 0:d7bd7384a37c 336 }
grzemich 0:d7bd7384a37c 337 }
grzemich 0:d7bd7384a37c 338 else
grzemich 0:d7bd7384a37c 339 {
grzemich 0:d7bd7384a37c 340 /* vb->value_len == 0, empty value (e.g. empty string) */
grzemich 0:d7bd7384a37c 341 vb->value = NULL;
grzemich 0:d7bd7384a37c 342 snmp_varbind_tail_add(&msg_ps->outvb, vb);
grzemich 0:d7bd7384a37c 343 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 344 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 345 }
grzemich 0:d7bd7384a37c 346 }
grzemich 0:d7bd7384a37c 347 else
grzemich 0:d7bd7384a37c 348 {
grzemich 0:d7bd7384a37c 349 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n"));
grzemich 0:d7bd7384a37c 350 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
grzemich 0:d7bd7384a37c 351 }
grzemich 0:d7bd7384a37c 352 }
grzemich 0:d7bd7384a37c 353 }
grzemich 0:d7bd7384a37c 354 }
grzemich 0:d7bd7384a37c 355 }
grzemich 0:d7bd7384a37c 356 else
grzemich 0:d7bd7384a37c 357 {
grzemich 0:d7bd7384a37c 358 mn = NULL;
grzemich 0:d7bd7384a37c 359 }
grzemich 0:d7bd7384a37c 360 if (mn == NULL)
grzemich 0:d7bd7384a37c 361 {
grzemich 0:d7bd7384a37c 362 /* mn == NULL, noSuchName */
grzemich 0:d7bd7384a37c 363 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 364 }
grzemich 0:d7bd7384a37c 365 }
grzemich 0:d7bd7384a37c 366 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
grzemich 0:d7bd7384a37c 367 (msg_ps->vb_idx == msg_ps->invb.count))
grzemich 0:d7bd7384a37c 368 {
grzemich 0:d7bd7384a37c 369 snmp_ok_response(msg_ps);
grzemich 0:d7bd7384a37c 370 }
grzemich 0:d7bd7384a37c 371 }
grzemich 0:d7bd7384a37c 372
grzemich 0:d7bd7384a37c 373 /**
grzemich 0:d7bd7384a37c 374 * Service an internal or external event for SNMP GETNEXT.
grzemich 0:d7bd7384a37c 375 *
grzemich 0:d7bd7384a37c 376 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
grzemich 0:d7bd7384a37c 377 * @param msg_ps points to the assosicated message process state
grzemich 0:d7bd7384a37c 378 */
grzemich 0:d7bd7384a37c 379 static void
grzemich 0:d7bd7384a37c 380 snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
grzemich 0:d7bd7384a37c 381 {
grzemich 0:d7bd7384a37c 382 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
grzemich 0:d7bd7384a37c 383
grzemich 0:d7bd7384a37c 384 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
grzemich 0:d7bd7384a37c 385 {
grzemich 0:d7bd7384a37c 386 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 387
grzemich 0:d7bd7384a37c 388 /* get_object_def() answer*/
grzemich 0:d7bd7384a37c 389 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 390
grzemich 0:d7bd7384a37c 391 /* translate answer into a known lifeform */
grzemich 0:d7bd7384a37c 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);
grzemich 0:d7bd7384a37c 393 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
grzemich 0:d7bd7384a37c 394 {
grzemich 0:d7bd7384a37c 395 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
grzemich 0:d7bd7384a37c 396 en->get_value_q(request_id, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 397 }
grzemich 0:d7bd7384a37c 398 else
grzemich 0:d7bd7384a37c 399 {
grzemich 0:d7bd7384a37c 400 en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
grzemich 0:d7bd7384a37c 401 /* search failed, object id points to unknown object (nosuchname) */
grzemich 0:d7bd7384a37c 402 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 403 }
grzemich 0:d7bd7384a37c 404 }
grzemich 0:d7bd7384a37c 405 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
grzemich 0:d7bd7384a37c 406 {
grzemich 0:d7bd7384a37c 407 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 408 struct snmp_varbind *vb;
grzemich 0:d7bd7384a37c 409
grzemich 0:d7bd7384a37c 410 /* get_value() answer */
grzemich 0:d7bd7384a37c 411 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 412
grzemich 0:d7bd7384a37c 413 LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
grzemich 0:d7bd7384a37c 414 vb = snmp_varbind_alloc(&msg_ps->ext_oid,
grzemich 0:d7bd7384a37c 415 msg_ps->ext_object_def.asn_type,
grzemich 0:d7bd7384a37c 416 (u8_t)msg_ps->ext_object_def.v_len);
grzemich 0:d7bd7384a37c 417 if (vb != NULL)
grzemich 0:d7bd7384a37c 418 {
grzemich 0:d7bd7384a37c 419 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
grzemich 0:d7bd7384a37c 420 snmp_varbind_tail_add(&msg_ps->outvb, vb);
grzemich 0:d7bd7384a37c 421 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 422 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 423 }
grzemich 0:d7bd7384a37c 424 else
grzemich 0:d7bd7384a37c 425 {
grzemich 0:d7bd7384a37c 426 en->get_value_pc(request_id, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 427 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
grzemich 0:d7bd7384a37c 428 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
grzemich 0:d7bd7384a37c 429 }
grzemich 0:d7bd7384a37c 430 }
grzemich 0:d7bd7384a37c 431
grzemich 0:d7bd7384a37c 432 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
grzemich 0:d7bd7384a37c 433 (msg_ps->vb_idx < msg_ps->invb.count))
grzemich 0:d7bd7384a37c 434 {
grzemich 0:d7bd7384a37c 435 struct mib_node *mn;
grzemich 0:d7bd7384a37c 436 struct snmp_obj_id oid;
grzemich 0:d7bd7384a37c 437
grzemich 0:d7bd7384a37c 438 if (msg_ps->vb_idx == 0)
grzemich 0:d7bd7384a37c 439 {
grzemich 0:d7bd7384a37c 440 msg_ps->vb_ptr = msg_ps->invb.head;
grzemich 0:d7bd7384a37c 441 }
grzemich 0:d7bd7384a37c 442 else
grzemich 0:d7bd7384a37c 443 {
grzemich 0:d7bd7384a37c 444 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
grzemich 0:d7bd7384a37c 445 }
grzemich 0:d7bd7384a37c 446 if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
grzemich 0:d7bd7384a37c 447 {
grzemich 0:d7bd7384a37c 448 if (msg_ps->vb_ptr->ident_len > 3)
grzemich 0:d7bd7384a37c 449 {
grzemich 0:d7bd7384a37c 450 /* can offset ident_len and ident */
grzemich 0:d7bd7384a37c 451 mn = snmp_expand_tree((struct mib_node*)&internet,
grzemich 0:d7bd7384a37c 452 msg_ps->vb_ptr->ident_len - 4,
grzemich 0:d7bd7384a37c 453 msg_ps->vb_ptr->ident + 4, &oid);
grzemich 0:d7bd7384a37c 454 }
grzemich 0:d7bd7384a37c 455 else
grzemich 0:d7bd7384a37c 456 {
grzemich 0:d7bd7384a37c 457 /* can't offset ident_len -4, ident + 4 */
grzemich 0:d7bd7384a37c 458 mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid);
grzemich 0:d7bd7384a37c 459 }
grzemich 0:d7bd7384a37c 460 }
grzemich 0:d7bd7384a37c 461 else
grzemich 0:d7bd7384a37c 462 {
grzemich 0:d7bd7384a37c 463 mn = NULL;
grzemich 0:d7bd7384a37c 464 }
grzemich 0:d7bd7384a37c 465 if (mn != NULL)
grzemich 0:d7bd7384a37c 466 {
grzemich 0:d7bd7384a37c 467 if (mn->node_type == MIB_NODE_EX)
grzemich 0:d7bd7384a37c 468 {
grzemich 0:d7bd7384a37c 469 /* external object */
grzemich 0:d7bd7384a37c 470 struct mib_external_node *en = (struct mib_external_node*)mn;
grzemich 0:d7bd7384a37c 471
grzemich 0:d7bd7384a37c 472 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
grzemich 0:d7bd7384a37c 473 /* save en && args in msg_ps!! */
grzemich 0:d7bd7384a37c 474 msg_ps->ext_mib_node = en;
grzemich 0:d7bd7384a37c 475 msg_ps->ext_oid = oid;
grzemich 0:d7bd7384a37c 476
grzemich 0:d7bd7384a37c 477 en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]);
grzemich 0:d7bd7384a37c 478 }
grzemich 0:d7bd7384a37c 479 else
grzemich 0:d7bd7384a37c 480 {
grzemich 0:d7bd7384a37c 481 /* internal object */
grzemich 0:d7bd7384a37c 482 struct obj_def object_def;
grzemich 0:d7bd7384a37c 483 struct snmp_varbind *vb;
grzemich 0:d7bd7384a37c 484
grzemich 0:d7bd7384a37c 485 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
grzemich 0:d7bd7384a37c 486 mn->get_object_def(1, &oid.id[oid.len - 1], &object_def);
grzemich 0:d7bd7384a37c 487
grzemich 0:d7bd7384a37c 488 LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
grzemich 0:d7bd7384a37c 489 vb = snmp_varbind_alloc(&oid, object_def.asn_type, (u8_t)object_def.v_len);
grzemich 0:d7bd7384a37c 490 if (vb != NULL)
grzemich 0:d7bd7384a37c 491 {
grzemich 0:d7bd7384a37c 492 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
grzemich 0:d7bd7384a37c 493 mn->get_value(&object_def, object_def.v_len, vb->value);
grzemich 0:d7bd7384a37c 494 snmp_varbind_tail_add(&msg_ps->outvb, vb);
grzemich 0:d7bd7384a37c 495 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 496 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 497 }
grzemich 0:d7bd7384a37c 498 else
grzemich 0:d7bd7384a37c 499 {
grzemich 0:d7bd7384a37c 500 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n"));
grzemich 0:d7bd7384a37c 501 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
grzemich 0:d7bd7384a37c 502 }
grzemich 0:d7bd7384a37c 503 }
grzemich 0:d7bd7384a37c 504 }
grzemich 0:d7bd7384a37c 505 if (mn == NULL)
grzemich 0:d7bd7384a37c 506 {
grzemich 0:d7bd7384a37c 507 /* mn == NULL, noSuchName */
grzemich 0:d7bd7384a37c 508 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 509 }
grzemich 0:d7bd7384a37c 510 }
grzemich 0:d7bd7384a37c 511 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
grzemich 0:d7bd7384a37c 512 (msg_ps->vb_idx == msg_ps->invb.count))
grzemich 0:d7bd7384a37c 513 {
grzemich 0:d7bd7384a37c 514 snmp_ok_response(msg_ps);
grzemich 0:d7bd7384a37c 515 }
grzemich 0:d7bd7384a37c 516 }
grzemich 0:d7bd7384a37c 517
grzemich 0:d7bd7384a37c 518 /**
grzemich 0:d7bd7384a37c 519 * Service an internal or external event for SNMP SET.
grzemich 0:d7bd7384a37c 520 *
grzemich 0:d7bd7384a37c 521 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
grzemich 0:d7bd7384a37c 522 * @param msg_ps points to the assosicated message process state
grzemich 0:d7bd7384a37c 523 */
grzemich 0:d7bd7384a37c 524 static void
grzemich 0:d7bd7384a37c 525 snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
grzemich 0:d7bd7384a37c 526 {
grzemich 0:d7bd7384a37c 527 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
grzemich 0:d7bd7384a37c 528
grzemich 0:d7bd7384a37c 529 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
grzemich 0:d7bd7384a37c 530 {
grzemich 0:d7bd7384a37c 531 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 532 struct snmp_name_ptr np;
grzemich 0:d7bd7384a37c 533
grzemich 0:d7bd7384a37c 534 /* get_object_def() answer*/
grzemich 0:d7bd7384a37c 535 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 536 np = msg_ps->ext_name_ptr;
grzemich 0:d7bd7384a37c 537
grzemich 0:d7bd7384a37c 538 /* translate answer into a known lifeform */
grzemich 0:d7bd7384a37c 539 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 540 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
grzemich 0:d7bd7384a37c 541 {
grzemich 0:d7bd7384a37c 542 msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST;
grzemich 0:d7bd7384a37c 543 en->set_test_q(request_id, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 544 }
grzemich 0:d7bd7384a37c 545 else
grzemich 0:d7bd7384a37c 546 {
grzemich 0:d7bd7384a37c 547 en->get_object_def_pc(request_id, np.ident_len, np.ident);
grzemich 0:d7bd7384a37c 548 /* search failed, object id points to unknown object (nosuchname) */
grzemich 0:d7bd7384a37c 549 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 550 }
grzemich 0:d7bd7384a37c 551 }
grzemich 0:d7bd7384a37c 552 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST)
grzemich 0:d7bd7384a37c 553 {
grzemich 0:d7bd7384a37c 554 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 555
grzemich 0:d7bd7384a37c 556 /* set_test() answer*/
grzemich 0:d7bd7384a37c 557 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 558
grzemich 0:d7bd7384a37c 559 if (msg_ps->ext_object_def.access & MIB_ACCESS_WRITE)
grzemich 0:d7bd7384a37c 560 {
grzemich 0:d7bd7384a37c 561 if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) &&
grzemich 0:d7bd7384a37c 562 (en->set_test_a(request_id,&msg_ps->ext_object_def,
grzemich 0:d7bd7384a37c 563 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
grzemich 0:d7bd7384a37c 564 {
grzemich 0:d7bd7384a37c 565 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 566 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 567 }
grzemich 0:d7bd7384a37c 568 else
grzemich 0:d7bd7384a37c 569 {
grzemich 0:d7bd7384a37c 570 en->set_test_pc(request_id,&msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 571 /* bad value */
grzemich 0:d7bd7384a37c 572 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
grzemich 0:d7bd7384a37c 573 }
grzemich 0:d7bd7384a37c 574 }
grzemich 0:d7bd7384a37c 575 else
grzemich 0:d7bd7384a37c 576 {
grzemich 0:d7bd7384a37c 577 en->set_test_pc(request_id,&msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 578 /* object not available for set */
grzemich 0:d7bd7384a37c 579 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 580 }
grzemich 0:d7bd7384a37c 581 }
grzemich 0:d7bd7384a37c 582 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S)
grzemich 0:d7bd7384a37c 583 {
grzemich 0:d7bd7384a37c 584 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 585 struct snmp_name_ptr np;
grzemich 0:d7bd7384a37c 586
grzemich 0:d7bd7384a37c 587 /* get_object_def() answer*/
grzemich 0:d7bd7384a37c 588 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 589 np = msg_ps->ext_name_ptr;
grzemich 0:d7bd7384a37c 590
grzemich 0:d7bd7384a37c 591 /* translate answer into a known lifeform */
grzemich 0:d7bd7384a37c 592 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
grzemich 0:d7bd7384a37c 593 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
grzemich 0:d7bd7384a37c 594 {
grzemich 0:d7bd7384a37c 595 msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE;
grzemich 0:d7bd7384a37c 596 en->set_value_q(request_id, &msg_ps->ext_object_def,
grzemich 0:d7bd7384a37c 597 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
grzemich 0:d7bd7384a37c 598 }
grzemich 0:d7bd7384a37c 599 else
grzemich 0:d7bd7384a37c 600 {
grzemich 0:d7bd7384a37c 601 en->get_object_def_pc(request_id, np.ident_len, np.ident);
grzemich 0:d7bd7384a37c 602 /* set_value failed, object has disappeared for some odd reason?? */
grzemich 0:d7bd7384a37c 603 snmp_error_response(msg_ps,SNMP_ES_GENERROR);
grzemich 0:d7bd7384a37c 604 }
grzemich 0:d7bd7384a37c 605 }
grzemich 0:d7bd7384a37c 606 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE)
grzemich 0:d7bd7384a37c 607 {
grzemich 0:d7bd7384a37c 608 struct mib_external_node *en;
grzemich 0:d7bd7384a37c 609
grzemich 0:d7bd7384a37c 610 /** set_value_a() */
grzemich 0:d7bd7384a37c 611 en = msg_ps->ext_mib_node;
grzemich 0:d7bd7384a37c 612 en->set_value_a(request_id, &msg_ps->ext_object_def,
grzemich 0:d7bd7384a37c 613 msg_ps->vb_ptr->value_len, msg_ps->vb_ptr->value);
grzemich 0:d7bd7384a37c 614
grzemich 0:d7bd7384a37c 615 /** @todo use set_value_pc() if toobig */
grzemich 0:d7bd7384a37c 616 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
grzemich 0:d7bd7384a37c 617 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 618 }
grzemich 0:d7bd7384a37c 619
grzemich 0:d7bd7384a37c 620 /* test all values before setting */
grzemich 0:d7bd7384a37c 621 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
grzemich 0:d7bd7384a37c 622 (msg_ps->vb_idx < msg_ps->invb.count))
grzemich 0:d7bd7384a37c 623 {
grzemich 0:d7bd7384a37c 624 struct mib_node *mn;
grzemich 0:d7bd7384a37c 625 struct snmp_name_ptr np;
grzemich 0:d7bd7384a37c 626
grzemich 0:d7bd7384a37c 627 if (msg_ps->vb_idx == 0)
grzemich 0:d7bd7384a37c 628 {
grzemich 0:d7bd7384a37c 629 msg_ps->vb_ptr = msg_ps->invb.head;
grzemich 0:d7bd7384a37c 630 }
grzemich 0:d7bd7384a37c 631 else
grzemich 0:d7bd7384a37c 632 {
grzemich 0:d7bd7384a37c 633 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
grzemich 0:d7bd7384a37c 634 }
grzemich 0:d7bd7384a37c 635 /** test object identifier for .iso.org.dod.internet prefix */
grzemich 0:d7bd7384a37c 636 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
grzemich 0:d7bd7384a37c 637 {
grzemich 0:d7bd7384a37c 638 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
grzemich 0:d7bd7384a37c 639 msg_ps->vb_ptr->ident + 4, &np);
grzemich 0:d7bd7384a37c 640 if (mn != NULL)
grzemich 0:d7bd7384a37c 641 {
grzemich 0:d7bd7384a37c 642 if (mn->node_type == MIB_NODE_EX)
grzemich 0:d7bd7384a37c 643 {
grzemich 0:d7bd7384a37c 644 /* external object */
grzemich 0:d7bd7384a37c 645 struct mib_external_node *en = (struct mib_external_node*)mn;
grzemich 0:d7bd7384a37c 646
grzemich 0:d7bd7384a37c 647 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
grzemich 0:d7bd7384a37c 648 /* save en && args in msg_ps!! */
grzemich 0:d7bd7384a37c 649 msg_ps->ext_mib_node = en;
grzemich 0:d7bd7384a37c 650 msg_ps->ext_name_ptr = np;
grzemich 0:d7bd7384a37c 651
grzemich 0:d7bd7384a37c 652 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
grzemich 0:d7bd7384a37c 653 }
grzemich 0:d7bd7384a37c 654 else
grzemich 0:d7bd7384a37c 655 {
grzemich 0:d7bd7384a37c 656 /* internal object */
grzemich 0:d7bd7384a37c 657 struct obj_def object_def;
grzemich 0:d7bd7384a37c 658
grzemich 0:d7bd7384a37c 659 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
grzemich 0:d7bd7384a37c 660 mn->get_object_def(np.ident_len, np.ident, &object_def);
grzemich 0:d7bd7384a37c 661 if (object_def.instance != MIB_OBJECT_NONE)
grzemich 0:d7bd7384a37c 662 {
grzemich 0:d7bd7384a37c 663 mn = mn;
grzemich 0:d7bd7384a37c 664 }
grzemich 0:d7bd7384a37c 665 else
grzemich 0:d7bd7384a37c 666 {
grzemich 0:d7bd7384a37c 667 /* search failed, object id points to unknown object (nosuchname) */
grzemich 0:d7bd7384a37c 668 mn = NULL;
grzemich 0:d7bd7384a37c 669 }
grzemich 0:d7bd7384a37c 670 if (mn != NULL)
grzemich 0:d7bd7384a37c 671 {
grzemich 0:d7bd7384a37c 672 msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST;
grzemich 0:d7bd7384a37c 673
grzemich 0:d7bd7384a37c 674 if (object_def.access & MIB_ACCESS_WRITE)
grzemich 0:d7bd7384a37c 675 {
grzemich 0:d7bd7384a37c 676 if ((object_def.asn_type == msg_ps->vb_ptr->value_type) &&
grzemich 0:d7bd7384a37c 677 (mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
grzemich 0:d7bd7384a37c 678 {
grzemich 0:d7bd7384a37c 679 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 680 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 681 }
grzemich 0:d7bd7384a37c 682 else
grzemich 0:d7bd7384a37c 683 {
grzemich 0:d7bd7384a37c 684 /* bad value */
grzemich 0:d7bd7384a37c 685 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
grzemich 0:d7bd7384a37c 686 }
grzemich 0:d7bd7384a37c 687 }
grzemich 0:d7bd7384a37c 688 else
grzemich 0:d7bd7384a37c 689 {
grzemich 0:d7bd7384a37c 690 /* object not available for set */
grzemich 0:d7bd7384a37c 691 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 692 }
grzemich 0:d7bd7384a37c 693 }
grzemich 0:d7bd7384a37c 694 }
grzemich 0:d7bd7384a37c 695 }
grzemich 0:d7bd7384a37c 696 }
grzemich 0:d7bd7384a37c 697 else
grzemich 0:d7bd7384a37c 698 {
grzemich 0:d7bd7384a37c 699 mn = NULL;
grzemich 0:d7bd7384a37c 700 }
grzemich 0:d7bd7384a37c 701 if (mn == NULL)
grzemich 0:d7bd7384a37c 702 {
grzemich 0:d7bd7384a37c 703 /* mn == NULL, noSuchName */
grzemich 0:d7bd7384a37c 704 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
grzemich 0:d7bd7384a37c 705 }
grzemich 0:d7bd7384a37c 706 }
grzemich 0:d7bd7384a37c 707
grzemich 0:d7bd7384a37c 708 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
grzemich 0:d7bd7384a37c 709 (msg_ps->vb_idx == msg_ps->invb.count))
grzemich 0:d7bd7384a37c 710 {
grzemich 0:d7bd7384a37c 711 msg_ps->vb_idx = 0;
grzemich 0:d7bd7384a37c 712 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
grzemich 0:d7bd7384a37c 713 }
grzemich 0:d7bd7384a37c 714
grzemich 0:d7bd7384a37c 715 /* set all values "atomically" (be as "atomic" as possible) */
grzemich 0:d7bd7384a37c 716 while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
grzemich 0:d7bd7384a37c 717 (msg_ps->vb_idx < msg_ps->invb.count))
grzemich 0:d7bd7384a37c 718 {
grzemich 0:d7bd7384a37c 719 struct mib_node *mn;
grzemich 0:d7bd7384a37c 720 struct snmp_name_ptr np;
grzemich 0:d7bd7384a37c 721
grzemich 0:d7bd7384a37c 722 if (msg_ps->vb_idx == 0)
grzemich 0:d7bd7384a37c 723 {
grzemich 0:d7bd7384a37c 724 msg_ps->vb_ptr = msg_ps->invb.head;
grzemich 0:d7bd7384a37c 725 }
grzemich 0:d7bd7384a37c 726 else
grzemich 0:d7bd7384a37c 727 {
grzemich 0:d7bd7384a37c 728 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
grzemich 0:d7bd7384a37c 729 }
grzemich 0:d7bd7384a37c 730 /* skip iso prefix test, was done previously while settesting() */
grzemich 0:d7bd7384a37c 731 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
grzemich 0:d7bd7384a37c 732 msg_ps->vb_ptr->ident + 4, &np);
grzemich 0:d7bd7384a37c 733 /* check if object is still available
grzemich 0:d7bd7384a37c 734 (e.g. external hot-plug thingy present?) */
grzemich 0:d7bd7384a37c 735 if (mn != NULL)
grzemich 0:d7bd7384a37c 736 {
grzemich 0:d7bd7384a37c 737 if (mn->node_type == MIB_NODE_EX)
grzemich 0:d7bd7384a37c 738 {
grzemich 0:d7bd7384a37c 739 /* external object */
grzemich 0:d7bd7384a37c 740 struct mib_external_node *en = (struct mib_external_node*)mn;
grzemich 0:d7bd7384a37c 741
grzemich 0:d7bd7384a37c 742 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S;
grzemich 0:d7bd7384a37c 743 /* save en && args in msg_ps!! */
grzemich 0:d7bd7384a37c 744 msg_ps->ext_mib_node = en;
grzemich 0:d7bd7384a37c 745 msg_ps->ext_name_ptr = np;
grzemich 0:d7bd7384a37c 746
grzemich 0:d7bd7384a37c 747 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
grzemich 0:d7bd7384a37c 748 }
grzemich 0:d7bd7384a37c 749 else
grzemich 0:d7bd7384a37c 750 {
grzemich 0:d7bd7384a37c 751 /* internal object */
grzemich 0:d7bd7384a37c 752 struct obj_def object_def;
grzemich 0:d7bd7384a37c 753
grzemich 0:d7bd7384a37c 754 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S;
grzemich 0:d7bd7384a37c 755 mn->get_object_def(np.ident_len, np.ident, &object_def);
grzemich 0:d7bd7384a37c 756 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
grzemich 0:d7bd7384a37c 757 mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
grzemich 0:d7bd7384a37c 758 msg_ps->vb_idx += 1;
grzemich 0:d7bd7384a37c 759 }
grzemich 0:d7bd7384a37c 760 }
grzemich 0:d7bd7384a37c 761 }
grzemich 0:d7bd7384a37c 762 if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
grzemich 0:d7bd7384a37c 763 (msg_ps->vb_idx == msg_ps->invb.count))
grzemich 0:d7bd7384a37c 764 {
grzemich 0:d7bd7384a37c 765 /* simply echo the input if we can set it
grzemich 0:d7bd7384a37c 766 @todo do we need to return the actual value?
grzemich 0:d7bd7384a37c 767 e.g. if value is silently modified or behaves sticky? */
grzemich 0:d7bd7384a37c 768 msg_ps->outvb = msg_ps->invb;
grzemich 0:d7bd7384a37c 769 msg_ps->invb.head = NULL;
grzemich 0:d7bd7384a37c 770 msg_ps->invb.tail = NULL;
grzemich 0:d7bd7384a37c 771 msg_ps->invb.count = 0;
grzemich 0:d7bd7384a37c 772 snmp_ok_response(msg_ps);
grzemich 0:d7bd7384a37c 773 }
grzemich 0:d7bd7384a37c 774 }
grzemich 0:d7bd7384a37c 775
grzemich 0:d7bd7384a37c 776
grzemich 0:d7bd7384a37c 777 /**
grzemich 0:d7bd7384a37c 778 * Handle one internal or external event.
grzemich 0:d7bd7384a37c 779 * Called for one async event. (recv external/private answer)
grzemich 0:d7bd7384a37c 780 *
grzemich 0:d7bd7384a37c 781 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
grzemich 0:d7bd7384a37c 782 */
grzemich 0:d7bd7384a37c 783 void
grzemich 0:d7bd7384a37c 784 snmp_msg_event(u8_t request_id)
grzemich 0:d7bd7384a37c 785 {
grzemich 0:d7bd7384a37c 786 struct snmp_msg_pstat *msg_ps;
grzemich 0:d7bd7384a37c 787
grzemich 0:d7bd7384a37c 788 if (request_id < SNMP_CONCURRENT_REQUESTS)
grzemich 0:d7bd7384a37c 789 {
grzemich 0:d7bd7384a37c 790 msg_ps = &msg_input_list[request_id];
grzemich 0:d7bd7384a37c 791 if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ)
grzemich 0:d7bd7384a37c 792 {
grzemich 0:d7bd7384a37c 793 snmp_msg_getnext_event(request_id, msg_ps);
grzemich 0:d7bd7384a37c 794 }
grzemich 0:d7bd7384a37c 795 else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ)
grzemich 0:d7bd7384a37c 796 {
grzemich 0:d7bd7384a37c 797 snmp_msg_get_event(request_id, msg_ps);
grzemich 0:d7bd7384a37c 798 }
grzemich 0:d7bd7384a37c 799 else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)
grzemich 0:d7bd7384a37c 800 {
grzemich 0:d7bd7384a37c 801 snmp_msg_set_event(request_id, msg_ps);
grzemich 0:d7bd7384a37c 802 }
grzemich 0:d7bd7384a37c 803 }
grzemich 0:d7bd7384a37c 804 }
grzemich 0:d7bd7384a37c 805
grzemich 0:d7bd7384a37c 806
grzemich 0:d7bd7384a37c 807 /* lwIP UDP receive callback function */
grzemich 0:d7bd7384a37c 808 static void
grzemich 0:d7bd7384a37c 809 snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
grzemich 0:d7bd7384a37c 810 {
grzemich 0:d7bd7384a37c 811 struct snmp_msg_pstat *msg_ps;
grzemich 0:d7bd7384a37c 812 u8_t req_idx;
grzemich 0:d7bd7384a37c 813 err_t err_ret;
grzemich 0:d7bd7384a37c 814 u16_t payload_len = p->tot_len;
grzemich 0:d7bd7384a37c 815 u16_t payload_ofs = 0;
grzemich 0:d7bd7384a37c 816 u16_t varbind_ofs = 0;
grzemich 0:d7bd7384a37c 817
grzemich 0:d7bd7384a37c 818 /* suppress unused argument warning */
grzemich 0:d7bd7384a37c 819 LWIP_UNUSED_ARG(arg);
grzemich 0:d7bd7384a37c 820
grzemich 0:d7bd7384a37c 821 /* traverse input message process list, look for SNMP_MSG_EMPTY */
grzemich 0:d7bd7384a37c 822 msg_ps = &msg_input_list[0];
grzemich 0:d7bd7384a37c 823 req_idx = 0;
grzemich 0:d7bd7384a37c 824 while ((req_idx < SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY))
grzemich 0:d7bd7384a37c 825 {
grzemich 0:d7bd7384a37c 826 req_idx++;
grzemich 0:d7bd7384a37c 827 msg_ps++;
grzemich 0:d7bd7384a37c 828 }
grzemich 0:d7bd7384a37c 829 if (req_idx == SNMP_CONCURRENT_REQUESTS)
grzemich 0:d7bd7384a37c 830 {
grzemich 0:d7bd7384a37c 831 /* exceeding number of concurrent requests */
grzemich 0:d7bd7384a37c 832 pbuf_free(p);
grzemich 0:d7bd7384a37c 833 return;
grzemich 0:d7bd7384a37c 834 }
grzemich 0:d7bd7384a37c 835
grzemich 0:d7bd7384a37c 836 /* accepting request */
grzemich 0:d7bd7384a37c 837 snmp_inc_snmpinpkts();
grzemich 0:d7bd7384a37c 838 /* record used 'protocol control block' */
grzemich 0:d7bd7384a37c 839 msg_ps->pcb = pcb;
grzemich 0:d7bd7384a37c 840 /* source address (network order) */
grzemich 0:d7bd7384a37c 841 msg_ps->sip = *addr;
grzemich 0:d7bd7384a37c 842 /* source port (host order (lwIP oddity)) */
grzemich 0:d7bd7384a37c 843 msg_ps->sp = port;
grzemich 0:d7bd7384a37c 844
grzemich 0:d7bd7384a37c 845 /* check total length, version, community, pdu type */
grzemich 0:d7bd7384a37c 846 err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
grzemich 0:d7bd7384a37c 847 /* Only accept requests and requests without error (be robust) */
grzemich 0:d7bd7384a37c 848 /* Reject response and trap headers or error requests as input! */
grzemich 0:d7bd7384a37c 849 if ((err_ret != ERR_OK) ||
grzemich 0:d7bd7384a37c 850 ((msg_ps->rt != SNMP_ASN1_PDU_GET_REQ) &&
grzemich 0:d7bd7384a37c 851 (msg_ps->rt != SNMP_ASN1_PDU_GET_NEXT_REQ) &&
grzemich 0:d7bd7384a37c 852 (msg_ps->rt != SNMP_ASN1_PDU_SET_REQ)) ||
grzemich 0:d7bd7384a37c 853 ((msg_ps->error_status != SNMP_ES_NOERROR) ||
grzemich 0:d7bd7384a37c 854 (msg_ps->error_index != 0)) )
grzemich 0:d7bd7384a37c 855 {
grzemich 0:d7bd7384a37c 856 /* header check failed drop request silently, do not return error! */
grzemich 0:d7bd7384a37c 857 pbuf_free(p);
grzemich 0:d7bd7384a37c 858 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
grzemich 0:d7bd7384a37c 859 return;
grzemich 0:d7bd7384a37c 860 }
grzemich 0:d7bd7384a37c 861 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
grzemich 0:d7bd7384a37c 862
grzemich 0:d7bd7384a37c 863 /* Builds a list of variable bindings. Copy the varbinds from the pbuf
grzemich 0:d7bd7384a37c 864 chain to glue them when these are divided over two or more pbuf's. */
grzemich 0:d7bd7384a37c 865 err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
grzemich 0:d7bd7384a37c 866 /* we've decoded the incoming message, release input msg now */
grzemich 0:d7bd7384a37c 867 pbuf_free(p);
grzemich 0:d7bd7384a37c 868 if ((err_ret != ERR_OK) || (msg_ps->invb.count == 0))
grzemich 0:d7bd7384a37c 869 {
grzemich 0:d7bd7384a37c 870 /* varbind-list decode failed, or varbind list empty.
grzemich 0:d7bd7384a37c 871 drop request silently, do not return error!
grzemich 0:d7bd7384a37c 872 (errors are only returned for a specific varbind failure) */
grzemich 0:d7bd7384a37c 873 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
grzemich 0:d7bd7384a37c 874 return;
grzemich 0:d7bd7384a37c 875 }
grzemich 0:d7bd7384a37c 876
grzemich 0:d7bd7384a37c 877 msg_ps->error_status = SNMP_ES_NOERROR;
grzemich 0:d7bd7384a37c 878 msg_ps->error_index = 0;
grzemich 0:d7bd7384a37c 879 /* find object for each variable binding */
grzemich 0:d7bd7384a37c 880 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
grzemich 0:d7bd7384a37c 881 /* first variable binding from list to inspect */
grzemich 0:d7bd7384a37c 882 msg_ps->vb_idx = 0;
grzemich 0:d7bd7384a37c 883
grzemich 0:d7bd7384a37c 884 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
grzemich 0:d7bd7384a37c 885
grzemich 0:d7bd7384a37c 886 /* handle input event and as much objects as possible in one go */
grzemich 0:d7bd7384a37c 887 snmp_msg_event(req_idx);
grzemich 0:d7bd7384a37c 888 }
grzemich 0:d7bd7384a37c 889
grzemich 0:d7bd7384a37c 890 /**
grzemich 0:d7bd7384a37c 891 * Checks and decodes incoming SNMP message header, logs header errors.
grzemich 0:d7bd7384a37c 892 *
grzemich 0:d7bd7384a37c 893 * @param p points to pbuf chain of SNMP message (UDP payload)
grzemich 0:d7bd7384a37c 894 * @param ofs points to first octet of SNMP message
grzemich 0:d7bd7384a37c 895 * @param pdu_len the length of the UDP payload
grzemich 0:d7bd7384a37c 896 * @param ofs_ret returns the ofset of the variable bindings
grzemich 0:d7bd7384a37c 897 * @param m_stat points to the current message request state return
grzemich 0:d7bd7384a37c 898 * @return
grzemich 0:d7bd7384a37c 899 * - ERR_OK SNMP header is sane and accepted
grzemich 0:d7bd7384a37c 900 * - ERR_ARG SNMP header is either malformed or rejected
grzemich 0:d7bd7384a37c 901 */
grzemich 0:d7bd7384a37c 902 static err_t
grzemich 0:d7bd7384a37c 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)
grzemich 0:d7bd7384a37c 904 {
grzemich 0:d7bd7384a37c 905 err_t derr;
grzemich 0:d7bd7384a37c 906 u16_t len, ofs_base;
grzemich 0:d7bd7384a37c 907 u8_t len_octets;
grzemich 0:d7bd7384a37c 908 u8_t type;
grzemich 0:d7bd7384a37c 909 s32_t version;
grzemich 0:d7bd7384a37c 910
grzemich 0:d7bd7384a37c 911 ofs_base = ofs;
grzemich 0:d7bd7384a37c 912 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 913 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 914 if ((derr != ERR_OK) ||
grzemich 0:d7bd7384a37c 915 (pdu_len != (1 + len_octets + len)) ||
grzemich 0:d7bd7384a37c 916 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
grzemich 0:d7bd7384a37c 917 {
grzemich 0:d7bd7384a37c 918 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 919 return ERR_ARG;
grzemich 0:d7bd7384a37c 920 }
grzemich 0:d7bd7384a37c 921 ofs += (1 + len_octets);
grzemich 0:d7bd7384a37c 922 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 923 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 924 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
grzemich 0:d7bd7384a37c 925 {
grzemich 0:d7bd7384a37c 926 /* can't decode or no integer (version) */
grzemich 0:d7bd7384a37c 927 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 928 return ERR_ARG;
grzemich 0:d7bd7384a37c 929 }
grzemich 0:d7bd7384a37c 930 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version);
grzemich 0:d7bd7384a37c 931 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 932 {
grzemich 0:d7bd7384a37c 933 /* can't decode */
grzemich 0:d7bd7384a37c 934 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 935 return ERR_ARG;
grzemich 0:d7bd7384a37c 936 }
grzemich 0:d7bd7384a37c 937 if (version != 0)
grzemich 0:d7bd7384a37c 938 {
grzemich 0:d7bd7384a37c 939 /* not version 1 */
grzemich 0:d7bd7384a37c 940 snmp_inc_snmpinbadversions();
grzemich 0:d7bd7384a37c 941 return ERR_ARG;
grzemich 0:d7bd7384a37c 942 }
grzemich 0:d7bd7384a37c 943 ofs += (1 + len_octets + len);
grzemich 0:d7bd7384a37c 944 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 945 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 946 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)))
grzemich 0:d7bd7384a37c 947 {
grzemich 0:d7bd7384a37c 948 /* can't decode or no octet string (community) */
grzemich 0:d7bd7384a37c 949 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 950 return ERR_ARG;
grzemich 0:d7bd7384a37c 951 }
grzemich 0:d7bd7384a37c 952 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community);
grzemich 0:d7bd7384a37c 953 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 954 {
grzemich 0:d7bd7384a37c 955 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 956 return ERR_ARG;
grzemich 0:d7bd7384a37c 957 }
grzemich 0:d7bd7384a37c 958 /* add zero terminator */
grzemich 0:d7bd7384a37c 959 len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN));
grzemich 0:d7bd7384a37c 960 m_stat->community[len] = 0;
grzemich 0:d7bd7384a37c 961 m_stat->com_strlen = (u8_t)len;
grzemich 0:d7bd7384a37c 962 if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0)
grzemich 0:d7bd7384a37c 963 {
grzemich 0:d7bd7384a37c 964 /** @todo: move this if we need to check more names */
grzemich 0:d7bd7384a37c 965 snmp_inc_snmpinbadcommunitynames();
grzemich 0:d7bd7384a37c 966 snmp_authfail_trap();
grzemich 0:d7bd7384a37c 967 return ERR_ARG;
grzemich 0:d7bd7384a37c 968 }
grzemich 0:d7bd7384a37c 969 ofs += (1 + len_octets + len);
grzemich 0:d7bd7384a37c 970 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 971 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 972 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 973 {
grzemich 0:d7bd7384a37c 974 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 975 return ERR_ARG;
grzemich 0:d7bd7384a37c 976 }
grzemich 0:d7bd7384a37c 977 switch(type)
grzemich 0:d7bd7384a37c 978 {
grzemich 0:d7bd7384a37c 979 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ):
grzemich 0:d7bd7384a37c 980 /* GetRequest PDU */
grzemich 0:d7bd7384a37c 981 snmp_inc_snmpingetrequests();
grzemich 0:d7bd7384a37c 982 derr = ERR_OK;
grzemich 0:d7bd7384a37c 983 break;
grzemich 0:d7bd7384a37c 984 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ):
grzemich 0:d7bd7384a37c 985 /* GetNextRequest PDU */
grzemich 0:d7bd7384a37c 986 snmp_inc_snmpingetnexts();
grzemich 0:d7bd7384a37c 987 derr = ERR_OK;
grzemich 0:d7bd7384a37c 988 break;
grzemich 0:d7bd7384a37c 989 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP):
grzemich 0:d7bd7384a37c 990 /* GetResponse PDU */
grzemich 0:d7bd7384a37c 991 snmp_inc_snmpingetresponses();
grzemich 0:d7bd7384a37c 992 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 993 break;
grzemich 0:d7bd7384a37c 994 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ):
grzemich 0:d7bd7384a37c 995 /* SetRequest PDU */
grzemich 0:d7bd7384a37c 996 snmp_inc_snmpinsetrequests();
grzemich 0:d7bd7384a37c 997 derr = ERR_OK;
grzemich 0:d7bd7384a37c 998 break;
grzemich 0:d7bd7384a37c 999 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP):
grzemich 0:d7bd7384a37c 1000 /* Trap PDU */
grzemich 0:d7bd7384a37c 1001 snmp_inc_snmpintraps();
grzemich 0:d7bd7384a37c 1002 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1003 break;
grzemich 0:d7bd7384a37c 1004 default:
grzemich 0:d7bd7384a37c 1005 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1006 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1007 break;
grzemich 0:d7bd7384a37c 1008 }
grzemich 0:d7bd7384a37c 1009 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 1010 {
grzemich 0:d7bd7384a37c 1011 /* unsupported input PDU for this agent (no parse error) */
grzemich 0:d7bd7384a37c 1012 return ERR_ARG;
grzemich 0:d7bd7384a37c 1013 }
grzemich 0:d7bd7384a37c 1014 m_stat->rt = type & 0x1F;
grzemich 0:d7bd7384a37c 1015 ofs += (1 + len_octets);
grzemich 0:d7bd7384a37c 1016 if (len != (pdu_len - (ofs - ofs_base)))
grzemich 0:d7bd7384a37c 1017 {
grzemich 0:d7bd7384a37c 1018 /* decoded PDU length does not equal actual payload length */
grzemich 0:d7bd7384a37c 1019 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1020 return ERR_ARG;
grzemich 0:d7bd7384a37c 1021 }
grzemich 0:d7bd7384a37c 1022 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 1023 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 1024 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
grzemich 0:d7bd7384a37c 1025 {
grzemich 0:d7bd7384a37c 1026 /* can't decode or no integer (request ID) */
grzemich 0:d7bd7384a37c 1027 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1028 return ERR_ARG;
grzemich 0:d7bd7384a37c 1029 }
grzemich 0:d7bd7384a37c 1030 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid);
grzemich 0:d7bd7384a37c 1031 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 1032 {
grzemich 0:d7bd7384a37c 1033 /* can't decode */
grzemich 0:d7bd7384a37c 1034 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1035 return ERR_ARG;
grzemich 0:d7bd7384a37c 1036 }
grzemich 0:d7bd7384a37c 1037 ofs += (1 + len_octets + len);
grzemich 0:d7bd7384a37c 1038 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 1039 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 1040 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
grzemich 0:d7bd7384a37c 1041 {
grzemich 0:d7bd7384a37c 1042 /* can't decode or no integer (error-status) */
grzemich 0:d7bd7384a37c 1043 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1044 return ERR_ARG;
grzemich 0:d7bd7384a37c 1045 }
grzemich 0:d7bd7384a37c 1046 /* must be noError (0) for incoming requests.
grzemich 0:d7bd7384a37c 1047 log errors for mib-2 completeness and for debug purposes */
grzemich 0:d7bd7384a37c 1048 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status);
grzemich 0:d7bd7384a37c 1049 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 1050 {
grzemich 0:d7bd7384a37c 1051 /* can't decode */
grzemich 0:d7bd7384a37c 1052 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1053 return ERR_ARG;
grzemich 0:d7bd7384a37c 1054 }
grzemich 0:d7bd7384a37c 1055 switch (m_stat->error_status)
grzemich 0:d7bd7384a37c 1056 {
grzemich 0:d7bd7384a37c 1057 case SNMP_ES_TOOBIG:
grzemich 0:d7bd7384a37c 1058 snmp_inc_snmpintoobigs();
grzemich 0:d7bd7384a37c 1059 break;
grzemich 0:d7bd7384a37c 1060 case SNMP_ES_NOSUCHNAME:
grzemich 0:d7bd7384a37c 1061 snmp_inc_snmpinnosuchnames();
grzemich 0:d7bd7384a37c 1062 break;
grzemich 0:d7bd7384a37c 1063 case SNMP_ES_BADVALUE:
grzemich 0:d7bd7384a37c 1064 snmp_inc_snmpinbadvalues();
grzemich 0:d7bd7384a37c 1065 break;
grzemich 0:d7bd7384a37c 1066 case SNMP_ES_READONLY:
grzemich 0:d7bd7384a37c 1067 snmp_inc_snmpinreadonlys();
grzemich 0:d7bd7384a37c 1068 break;
grzemich 0:d7bd7384a37c 1069 case SNMP_ES_GENERROR:
grzemich 0:d7bd7384a37c 1070 snmp_inc_snmpingenerrs();
grzemich 0:d7bd7384a37c 1071 break;
grzemich 0:d7bd7384a37c 1072 }
grzemich 0:d7bd7384a37c 1073 ofs += (1 + len_octets + len);
grzemich 0:d7bd7384a37c 1074 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 1075 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 1076 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
grzemich 0:d7bd7384a37c 1077 {
grzemich 0:d7bd7384a37c 1078 /* can't decode or no integer (error-index) */
grzemich 0:d7bd7384a37c 1079 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1080 return ERR_ARG;
grzemich 0:d7bd7384a37c 1081 }
grzemich 0:d7bd7384a37c 1082 /* must be 0 for incoming requests.
grzemich 0:d7bd7384a37c 1083 decode anyway to catch bad integers (and dirty tricks) */
grzemich 0:d7bd7384a37c 1084 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index);
grzemich 0:d7bd7384a37c 1085 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 1086 {
grzemich 0:d7bd7384a37c 1087 /* can't decode */
grzemich 0:d7bd7384a37c 1088 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1089 return ERR_ARG;
grzemich 0:d7bd7384a37c 1090 }
grzemich 0:d7bd7384a37c 1091 ofs += (1 + len_octets + len);
grzemich 0:d7bd7384a37c 1092 *ofs_ret = ofs;
grzemich 0:d7bd7384a37c 1093 return ERR_OK;
grzemich 0:d7bd7384a37c 1094 }
grzemich 0:d7bd7384a37c 1095
grzemich 0:d7bd7384a37c 1096 static err_t
grzemich 0:d7bd7384a37c 1097 snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
grzemich 0:d7bd7384a37c 1098 {
grzemich 0:d7bd7384a37c 1099 err_t derr;
grzemich 0:d7bd7384a37c 1100 u16_t len, vb_len;
grzemich 0:d7bd7384a37c 1101 u8_t len_octets;
grzemich 0:d7bd7384a37c 1102 u8_t type;
grzemich 0:d7bd7384a37c 1103
grzemich 0:d7bd7384a37c 1104 /* variable binding list */
grzemich 0:d7bd7384a37c 1105 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 1106 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len);
grzemich 0:d7bd7384a37c 1107 if ((derr != ERR_OK) ||
grzemich 0:d7bd7384a37c 1108 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
grzemich 0:d7bd7384a37c 1109 {
grzemich 0:d7bd7384a37c 1110 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1111 return ERR_ARG;
grzemich 0:d7bd7384a37c 1112 }
grzemich 0:d7bd7384a37c 1113 ofs += (1 + len_octets);
grzemich 0:d7bd7384a37c 1114
grzemich 0:d7bd7384a37c 1115 /* start with empty list */
grzemich 0:d7bd7384a37c 1116 m_stat->invb.count = 0;
grzemich 0:d7bd7384a37c 1117 m_stat->invb.head = NULL;
grzemich 0:d7bd7384a37c 1118 m_stat->invb.tail = NULL;
grzemich 0:d7bd7384a37c 1119
grzemich 0:d7bd7384a37c 1120 while (vb_len > 0)
grzemich 0:d7bd7384a37c 1121 {
grzemich 0:d7bd7384a37c 1122 struct snmp_obj_id oid, oid_value;
grzemich 0:d7bd7384a37c 1123 struct snmp_varbind *vb;
grzemich 0:d7bd7384a37c 1124
grzemich 0:d7bd7384a37c 1125 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 1126 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 1127 if ((derr != ERR_OK) ||
grzemich 0:d7bd7384a37c 1128 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) ||
grzemich 0:d7bd7384a37c 1129 (len == 0) || (len > vb_len))
grzemich 0:d7bd7384a37c 1130 {
grzemich 0:d7bd7384a37c 1131 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1132 /* free varbinds (if available) */
grzemich 0:d7bd7384a37c 1133 snmp_varbind_list_free(&m_stat->invb);
grzemich 0:d7bd7384a37c 1134 return ERR_ARG;
grzemich 0:d7bd7384a37c 1135 }
grzemich 0:d7bd7384a37c 1136 ofs += (1 + len_octets);
grzemich 0:d7bd7384a37c 1137 vb_len -= (1 + len_octets);
grzemich 0:d7bd7384a37c 1138
grzemich 0:d7bd7384a37c 1139 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 1140 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 1141 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)))
grzemich 0:d7bd7384a37c 1142 {
grzemich 0:d7bd7384a37c 1143 /* can't decode object name length */
grzemich 0:d7bd7384a37c 1144 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1145 /* free varbinds (if available) */
grzemich 0:d7bd7384a37c 1146 snmp_varbind_list_free(&m_stat->invb);
grzemich 0:d7bd7384a37c 1147 return ERR_ARG;
grzemich 0:d7bd7384a37c 1148 }
grzemich 0:d7bd7384a37c 1149 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid);
grzemich 0:d7bd7384a37c 1150 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 1151 {
grzemich 0:d7bd7384a37c 1152 /* can't decode object name */
grzemich 0:d7bd7384a37c 1153 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1154 /* free varbinds (if available) */
grzemich 0:d7bd7384a37c 1155 snmp_varbind_list_free(&m_stat->invb);
grzemich 0:d7bd7384a37c 1156 return ERR_ARG;
grzemich 0:d7bd7384a37c 1157 }
grzemich 0:d7bd7384a37c 1158 ofs += (1 + len_octets + len);
grzemich 0:d7bd7384a37c 1159 vb_len -= (1 + len_octets + len);
grzemich 0:d7bd7384a37c 1160
grzemich 0:d7bd7384a37c 1161 snmp_asn1_dec_type(p, ofs, &type);
grzemich 0:d7bd7384a37c 1162 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
grzemich 0:d7bd7384a37c 1163 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 1164 {
grzemich 0:d7bd7384a37c 1165 /* can't decode object value length */
grzemich 0:d7bd7384a37c 1166 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1167 /* free varbinds (if available) */
grzemich 0:d7bd7384a37c 1168 snmp_varbind_list_free(&m_stat->invb);
grzemich 0:d7bd7384a37c 1169 return ERR_ARG;
grzemich 0:d7bd7384a37c 1170 }
grzemich 0:d7bd7384a37c 1171
grzemich 0:d7bd7384a37c 1172 switch (type)
grzemich 0:d7bd7384a37c 1173 {
grzemich 0:d7bd7384a37c 1174 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
grzemich 0:d7bd7384a37c 1175 vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t));
grzemich 0:d7bd7384a37c 1176 if (vb != NULL)
grzemich 0:d7bd7384a37c 1177 {
grzemich 0:d7bd7384a37c 1178 s32_t *vptr = (s32_t*)vb->value;
grzemich 0:d7bd7384a37c 1179
grzemich 0:d7bd7384a37c 1180 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr);
grzemich 0:d7bd7384a37c 1181 snmp_varbind_tail_add(&m_stat->invb, vb);
grzemich 0:d7bd7384a37c 1182 }
grzemich 0:d7bd7384a37c 1183 else
grzemich 0:d7bd7384a37c 1184 {
grzemich 0:d7bd7384a37c 1185 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1186 }
grzemich 0:d7bd7384a37c 1187 break;
grzemich 0:d7bd7384a37c 1188 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
grzemich 0:d7bd7384a37c 1189 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
grzemich 0:d7bd7384a37c 1190 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
grzemich 0:d7bd7384a37c 1191 vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t));
grzemich 0:d7bd7384a37c 1192 if (vb != NULL)
grzemich 0:d7bd7384a37c 1193 {
grzemich 0:d7bd7384a37c 1194 u32_t *vptr = (u32_t*)vb->value;
grzemich 0:d7bd7384a37c 1195
grzemich 0:d7bd7384a37c 1196 derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr);
grzemich 0:d7bd7384a37c 1197 snmp_varbind_tail_add(&m_stat->invb, vb);
grzemich 0:d7bd7384a37c 1198 }
grzemich 0:d7bd7384a37c 1199 else
grzemich 0:d7bd7384a37c 1200 {
grzemich 0:d7bd7384a37c 1201 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1202 }
grzemich 0:d7bd7384a37c 1203 break;
grzemich 0:d7bd7384a37c 1204 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
grzemich 0:d7bd7384a37c 1205 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
grzemich 0:d7bd7384a37c 1206 LWIP_ASSERT("invalid length", len <= 0xff);
grzemich 0:d7bd7384a37c 1207 vb = snmp_varbind_alloc(&oid, type, (u8_t)len);
grzemich 0:d7bd7384a37c 1208 if (vb != NULL)
grzemich 0:d7bd7384a37c 1209 {
grzemich 0:d7bd7384a37c 1210 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
grzemich 0:d7bd7384a37c 1211 snmp_varbind_tail_add(&m_stat->invb, vb);
grzemich 0:d7bd7384a37c 1212 }
grzemich 0:d7bd7384a37c 1213 else
grzemich 0:d7bd7384a37c 1214 {
grzemich 0:d7bd7384a37c 1215 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1216 }
grzemich 0:d7bd7384a37c 1217 break;
grzemich 0:d7bd7384a37c 1218 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
grzemich 0:d7bd7384a37c 1219 vb = snmp_varbind_alloc(&oid, type, 0);
grzemich 0:d7bd7384a37c 1220 if (vb != NULL)
grzemich 0:d7bd7384a37c 1221 {
grzemich 0:d7bd7384a37c 1222 snmp_varbind_tail_add(&m_stat->invb, vb);
grzemich 0:d7bd7384a37c 1223 derr = ERR_OK;
grzemich 0:d7bd7384a37c 1224 }
grzemich 0:d7bd7384a37c 1225 else
grzemich 0:d7bd7384a37c 1226 {
grzemich 0:d7bd7384a37c 1227 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1228 }
grzemich 0:d7bd7384a37c 1229 break;
grzemich 0:d7bd7384a37c 1230 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
grzemich 0:d7bd7384a37c 1231 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value);
grzemich 0:d7bd7384a37c 1232 if (derr == ERR_OK)
grzemich 0:d7bd7384a37c 1233 {
grzemich 0:d7bd7384a37c 1234 vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t));
grzemich 0:d7bd7384a37c 1235 if (vb != NULL)
grzemich 0:d7bd7384a37c 1236 {
grzemich 0:d7bd7384a37c 1237 u8_t i = oid_value.len;
grzemich 0:d7bd7384a37c 1238 s32_t *vptr = (s32_t*)vb->value;
grzemich 0:d7bd7384a37c 1239
grzemich 0:d7bd7384a37c 1240 while(i > 0)
grzemich 0:d7bd7384a37c 1241 {
grzemich 0:d7bd7384a37c 1242 i--;
grzemich 0:d7bd7384a37c 1243 vptr[i] = oid_value.id[i];
grzemich 0:d7bd7384a37c 1244 }
grzemich 0:d7bd7384a37c 1245 snmp_varbind_tail_add(&m_stat->invb, vb);
grzemich 0:d7bd7384a37c 1246 derr = ERR_OK;
grzemich 0:d7bd7384a37c 1247 }
grzemich 0:d7bd7384a37c 1248 else
grzemich 0:d7bd7384a37c 1249 {
grzemich 0:d7bd7384a37c 1250 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1251 }
grzemich 0:d7bd7384a37c 1252 }
grzemich 0:d7bd7384a37c 1253 break;
grzemich 0:d7bd7384a37c 1254 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
grzemich 0:d7bd7384a37c 1255 if (len == 4)
grzemich 0:d7bd7384a37c 1256 {
grzemich 0:d7bd7384a37c 1257 /* must be exactly 4 octets! */
grzemich 0:d7bd7384a37c 1258 vb = snmp_varbind_alloc(&oid, type, 4);
grzemich 0:d7bd7384a37c 1259 if (vb != NULL)
grzemich 0:d7bd7384a37c 1260 {
grzemich 0:d7bd7384a37c 1261 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
grzemich 0:d7bd7384a37c 1262 snmp_varbind_tail_add(&m_stat->invb, vb);
grzemich 0:d7bd7384a37c 1263 }
grzemich 0:d7bd7384a37c 1264 else
grzemich 0:d7bd7384a37c 1265 {
grzemich 0:d7bd7384a37c 1266 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1267 }
grzemich 0:d7bd7384a37c 1268 }
grzemich 0:d7bd7384a37c 1269 else
grzemich 0:d7bd7384a37c 1270 {
grzemich 0:d7bd7384a37c 1271 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1272 }
grzemich 0:d7bd7384a37c 1273 break;
grzemich 0:d7bd7384a37c 1274 default:
grzemich 0:d7bd7384a37c 1275 derr = ERR_ARG;
grzemich 0:d7bd7384a37c 1276 break;
grzemich 0:d7bd7384a37c 1277 }
grzemich 0:d7bd7384a37c 1278 if (derr != ERR_OK)
grzemich 0:d7bd7384a37c 1279 {
grzemich 0:d7bd7384a37c 1280 snmp_inc_snmpinasnparseerrs();
grzemich 0:d7bd7384a37c 1281 /* free varbinds (if available) */
grzemich 0:d7bd7384a37c 1282 snmp_varbind_list_free(&m_stat->invb);
grzemich 0:d7bd7384a37c 1283 return ERR_ARG;
grzemich 0:d7bd7384a37c 1284 }
grzemich 0:d7bd7384a37c 1285 ofs += (1 + len_octets + len);
grzemich 0:d7bd7384a37c 1286 vb_len -= (1 + len_octets + len);
grzemich 0:d7bd7384a37c 1287 }
grzemich 0:d7bd7384a37c 1288
grzemich 0:d7bd7384a37c 1289 if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ)
grzemich 0:d7bd7384a37c 1290 {
grzemich 0:d7bd7384a37c 1291 snmp_add_snmpintotalsetvars(m_stat->invb.count);
grzemich 0:d7bd7384a37c 1292 }
grzemich 0:d7bd7384a37c 1293 else
grzemich 0:d7bd7384a37c 1294 {
grzemich 0:d7bd7384a37c 1295 snmp_add_snmpintotalreqvars(m_stat->invb.count);
grzemich 0:d7bd7384a37c 1296 }
grzemich 0:d7bd7384a37c 1297
grzemich 0:d7bd7384a37c 1298 *ofs_ret = ofs;
grzemich 0:d7bd7384a37c 1299 return ERR_OK;
grzemich 0:d7bd7384a37c 1300 }
grzemich 0:d7bd7384a37c 1301
grzemich 0:d7bd7384a37c 1302 struct snmp_varbind*
grzemich 0:d7bd7384a37c 1303 snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
grzemich 0:d7bd7384a37c 1304 {
grzemich 0:d7bd7384a37c 1305 struct snmp_varbind *vb;
grzemich 0:d7bd7384a37c 1306
grzemich 0:d7bd7384a37c 1307 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
grzemich 0:d7bd7384a37c 1308 LWIP_ASSERT("vb != NULL",vb != NULL);
grzemich 0:d7bd7384a37c 1309 if (vb != NULL)
grzemich 0:d7bd7384a37c 1310 {
grzemich 0:d7bd7384a37c 1311 u8_t i;
grzemich 0:d7bd7384a37c 1312
grzemich 0:d7bd7384a37c 1313 vb->next = NULL;
grzemich 0:d7bd7384a37c 1314 vb->prev = NULL;
grzemich 0:d7bd7384a37c 1315 i = oid->len;
grzemich 0:d7bd7384a37c 1316 vb->ident_len = i;
grzemich 0:d7bd7384a37c 1317 if (i > 0)
grzemich 0:d7bd7384a37c 1318 {
grzemich 0:d7bd7384a37c 1319 LWIP_ASSERT("SNMP_MAX_TREE_DEPTH is configured too low", i <= SNMP_MAX_TREE_DEPTH);
grzemich 0:d7bd7384a37c 1320 /* allocate array of s32_t for our object identifier */
grzemich 0:d7bd7384a37c 1321 vb->ident = (s32_t*)memp_malloc(MEMP_SNMP_VALUE);
grzemich 0:d7bd7384a37c 1322 LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL);
grzemich 0:d7bd7384a37c 1323 if (vb->ident == NULL)
grzemich 0:d7bd7384a37c 1324 {
grzemich 0:d7bd7384a37c 1325 memp_free(MEMP_SNMP_VARBIND, vb);
grzemich 0:d7bd7384a37c 1326 return NULL;
grzemich 0:d7bd7384a37c 1327 }
grzemich 0:d7bd7384a37c 1328 while(i > 0)
grzemich 0:d7bd7384a37c 1329 {
grzemich 0:d7bd7384a37c 1330 i--;
grzemich 0:d7bd7384a37c 1331 vb->ident[i] = oid->id[i];
grzemich 0:d7bd7384a37c 1332 }
grzemich 0:d7bd7384a37c 1333 }
grzemich 0:d7bd7384a37c 1334 else
grzemich 0:d7bd7384a37c 1335 {
grzemich 0:d7bd7384a37c 1336 /* i == 0, pass zero length object identifier */
grzemich 0:d7bd7384a37c 1337 vb->ident = NULL;
grzemich 0:d7bd7384a37c 1338 }
grzemich 0:d7bd7384a37c 1339 vb->value_type = type;
grzemich 0:d7bd7384a37c 1340 vb->value_len = len;
grzemich 0:d7bd7384a37c 1341 if (len > 0)
grzemich 0:d7bd7384a37c 1342 {
grzemich 0:d7bd7384a37c 1343 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
grzemich 0:d7bd7384a37c 1344 /* allocate raw bytes for our object value */
grzemich 0:d7bd7384a37c 1345 vb->value = memp_malloc(MEMP_SNMP_VALUE);
grzemich 0:d7bd7384a37c 1346 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
grzemich 0:d7bd7384a37c 1347 if (vb->value == NULL)
grzemich 0:d7bd7384a37c 1348 {
grzemich 0:d7bd7384a37c 1349 if (vb->ident != NULL)
grzemich 0:d7bd7384a37c 1350 {
grzemich 0:d7bd7384a37c 1351 memp_free(MEMP_SNMP_VALUE, vb->ident);
grzemich 0:d7bd7384a37c 1352 }
grzemich 0:d7bd7384a37c 1353 memp_free(MEMP_SNMP_VARBIND, vb);
grzemich 0:d7bd7384a37c 1354 return NULL;
grzemich 0:d7bd7384a37c 1355 }
grzemich 0:d7bd7384a37c 1356 }
grzemich 0:d7bd7384a37c 1357 else
grzemich 0:d7bd7384a37c 1358 {
grzemich 0:d7bd7384a37c 1359 /* ASN1_NUL type, or zero length ASN1_OC_STR */
grzemich 0:d7bd7384a37c 1360 vb->value = NULL;
grzemich 0:d7bd7384a37c 1361 }
grzemich 0:d7bd7384a37c 1362 }
grzemich 0:d7bd7384a37c 1363 return vb;
grzemich 0:d7bd7384a37c 1364 }
grzemich 0:d7bd7384a37c 1365
grzemich 0:d7bd7384a37c 1366 void
grzemich 0:d7bd7384a37c 1367 snmp_varbind_free(struct snmp_varbind *vb)
grzemich 0:d7bd7384a37c 1368 {
grzemich 0:d7bd7384a37c 1369 if (vb->value != NULL )
grzemich 0:d7bd7384a37c 1370 {
grzemich 0:d7bd7384a37c 1371 memp_free(MEMP_SNMP_VALUE, vb->value);
grzemich 0:d7bd7384a37c 1372 }
grzemich 0:d7bd7384a37c 1373 if (vb->ident != NULL )
grzemich 0:d7bd7384a37c 1374 {
grzemich 0:d7bd7384a37c 1375 memp_free(MEMP_SNMP_VALUE, vb->ident);
grzemich 0:d7bd7384a37c 1376 }
grzemich 0:d7bd7384a37c 1377 memp_free(MEMP_SNMP_VARBIND, vb);
grzemich 0:d7bd7384a37c 1378 }
grzemich 0:d7bd7384a37c 1379
grzemich 0:d7bd7384a37c 1380 void
grzemich 0:d7bd7384a37c 1381 snmp_varbind_list_free(struct snmp_varbind_root *root)
grzemich 0:d7bd7384a37c 1382 {
grzemich 0:d7bd7384a37c 1383 struct snmp_varbind *vb, *prev;
grzemich 0:d7bd7384a37c 1384
grzemich 0:d7bd7384a37c 1385 vb = root->tail;
grzemich 0:d7bd7384a37c 1386 while ( vb != NULL )
grzemich 0:d7bd7384a37c 1387 {
grzemich 0:d7bd7384a37c 1388 prev = vb->prev;
grzemich 0:d7bd7384a37c 1389 snmp_varbind_free(vb);
grzemich 0:d7bd7384a37c 1390 vb = prev;
grzemich 0:d7bd7384a37c 1391 }
grzemich 0:d7bd7384a37c 1392 root->count = 0;
grzemich 0:d7bd7384a37c 1393 root->head = NULL;
grzemich 0:d7bd7384a37c 1394 root->tail = NULL;
grzemich 0:d7bd7384a37c 1395 }
grzemich 0:d7bd7384a37c 1396
grzemich 0:d7bd7384a37c 1397 void
grzemich 0:d7bd7384a37c 1398 snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb)
grzemich 0:d7bd7384a37c 1399 {
grzemich 0:d7bd7384a37c 1400 if (root->count == 0)
grzemich 0:d7bd7384a37c 1401 {
grzemich 0:d7bd7384a37c 1402 /* add first varbind to list */
grzemich 0:d7bd7384a37c 1403 root->head = vb;
grzemich 0:d7bd7384a37c 1404 root->tail = vb;
grzemich 0:d7bd7384a37c 1405 }
grzemich 0:d7bd7384a37c 1406 else
grzemich 0:d7bd7384a37c 1407 {
grzemich 0:d7bd7384a37c 1408 /* add nth varbind to list tail */
grzemich 0:d7bd7384a37c 1409 root->tail->next = vb;
grzemich 0:d7bd7384a37c 1410 vb->prev = root->tail;
grzemich 0:d7bd7384a37c 1411 root->tail = vb;
grzemich 0:d7bd7384a37c 1412 }
grzemich 0:d7bd7384a37c 1413 root->count += 1;
grzemich 0:d7bd7384a37c 1414 }
grzemich 0:d7bd7384a37c 1415
grzemich 0:d7bd7384a37c 1416 struct snmp_varbind*
grzemich 0:d7bd7384a37c 1417 snmp_varbind_tail_remove(struct snmp_varbind_root *root)
grzemich 0:d7bd7384a37c 1418 {
grzemich 0:d7bd7384a37c 1419 struct snmp_varbind* vb;
grzemich 0:d7bd7384a37c 1420
grzemich 0:d7bd7384a37c 1421 if (root->count > 0)
grzemich 0:d7bd7384a37c 1422 {
grzemich 0:d7bd7384a37c 1423 /* remove tail varbind */
grzemich 0:d7bd7384a37c 1424 vb = root->tail;
grzemich 0:d7bd7384a37c 1425 root->tail = vb->prev;
grzemich 0:d7bd7384a37c 1426 vb->prev->next = NULL;
grzemich 0:d7bd7384a37c 1427 root->count -= 1;
grzemich 0:d7bd7384a37c 1428 }
grzemich 0:d7bd7384a37c 1429 else
grzemich 0:d7bd7384a37c 1430 {
grzemich 0:d7bd7384a37c 1431 /* nothing to remove */
grzemich 0:d7bd7384a37c 1432 vb = NULL;
grzemich 0:d7bd7384a37c 1433 }
grzemich 0:d7bd7384a37c 1434 return vb;
grzemich 0:d7bd7384a37c 1435 }
grzemich 0:d7bd7384a37c 1436
grzemich 0:d7bd7384a37c 1437 #endif /* LWIP_SNMP */