[164] | 1 | /**
|
---|
| 2 | * @file
|
---|
| 3 | * SNMP input message processing (RFC1157).
|
---|
| 4 | */
|
---|
| 5 |
|
---|
| 6 | /*
|
---|
| 7 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
|
---|
| 8 | * All rights reserved.
|
---|
| 9 | *
|
---|
| 10 | * Redistribution and use in source and binary forms, with or without modification,
|
---|
| 11 | * are permitted provided that the following conditions are met:
|
---|
| 12 | *
|
---|
| 13 | * 1. Redistributions of source code must retain the above copyright notice,
|
---|
| 14 | * this list of conditions and the following disclaimer.
|
---|
| 15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
|
---|
| 16 | * this list of conditions and the following disclaimer in the documentation
|
---|
| 17 | * and/or other materials provided with the distribution.
|
---|
| 18 | * 3. The name of the author may not be used to endorse or promote products
|
---|
| 19 | * derived from this software without specific prior written permission.
|
---|
| 20 | *
|
---|
| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
---|
| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
---|
| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
---|
| 24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
---|
| 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
---|
| 26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
---|
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
---|
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
---|
| 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
---|
| 30 | * OF SUCH DAMAGE.
|
---|
| 31 | *
|
---|
| 32 | * Author: Christiaan Simons <christiaan.simons@axon.tv>
|
---|
| 33 | */
|
---|
| 34 |
|
---|
| 35 | #include "lwip/opt.h"
|
---|
| 36 |
|
---|
| 37 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
|
---|
| 38 |
|
---|
| 39 | #include "lwip/snmp.h"
|
---|
| 40 | #include "lwip/snmp_asn1.h"
|
---|
| 41 | #include "lwip/snmp_msg.h"
|
---|
| 42 | #include "lwip/snmp_structs.h"
|
---|
| 43 | #include "lwip/ip_addr.h"
|
---|
| 44 | #include "lwip/memp.h"
|
---|
| 45 | #include "lwip/udp.h"
|
---|
| 46 | #include "lwip/stats.h"
|
---|
| 47 |
|
---|
| 48 | #include <string.h>
|
---|
| 49 |
|
---|
| 50 | /* public (non-static) constants */
|
---|
| 51 | /** SNMP v1 == 0 */
|
---|
| 52 | const s32_t snmp_version = 0;
|
---|
| 53 | /** default SNMP community string */
|
---|
| 54 | const char snmp_publiccommunity[7] = "public";
|
---|
| 55 |
|
---|
| 56 | /* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
|
---|
| 57 | struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
|
---|
| 58 | /* UDP Protocol Control Block */
|
---|
| 59 | struct udp_pcb *snmp1_pcb;
|
---|
| 60 |
|
---|
| 61 | static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
|
---|
| 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);
|
---|
| 63 | static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
|
---|
| 64 |
|
---|
| 65 |
|
---|
| 66 | /**
|
---|
| 67 | * Starts SNMP Agent.
|
---|
| 68 | * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
|
---|
| 69 | */
|
---|
| 70 | void
|
---|
| 71 | snmp_init(void)
|
---|
| 72 | {
|
---|
| 73 | struct snmp_msg_pstat *msg_ps;
|
---|
| 74 | u8_t i;
|
---|
| 75 |
|
---|
| 76 | snmp1_pcb = udp_new();
|
---|
| 77 | if (snmp1_pcb != NULL)
|
---|
| 78 | {
|
---|
| 79 | udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
|
---|
| 80 | udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
|
---|
| 81 | }
|
---|
| 82 | msg_ps = &msg_input_list[0];
|
---|
| 83 | for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
|
---|
| 84 | {
|
---|
| 85 | msg_ps->state = SNMP_MSG_EMPTY;
|
---|
| 86 | msg_ps->error_index = 0;
|
---|
| 87 | msg_ps->error_status = SNMP_ES_NOERROR;
|
---|
| 88 | msg_ps++;
|
---|
| 89 | }
|
---|
| 90 | trap_msg.pcb = snmp1_pcb;
|
---|
| 91 |
|
---|
| 92 | #ifdef SNMP_PRIVATE_MIB_INIT
|
---|
| 93 | /* If defined, this must be a function-like define to initialize the
|
---|
| 94 | * private MIB after the stack has been initialized.
|
---|
| 95 | * The private MIB can also be initialized in tcpip_callback (or after
|
---|
| 96 | * the stack is initialized), this define is only for convenience. */
|
---|
| 97 | SNMP_PRIVATE_MIB_INIT();
|
---|
| 98 | #endif /* SNMP_PRIVATE_MIB_INIT */
|
---|
| 99 |
|
---|
| 100 | /* The coldstart trap will only be output
|
---|
| 101 | if our outgoing interface is up & configured */
|
---|
| 102 | snmp_coldstart_trap();
|
---|
| 103 | }
|
---|
| 104 |
|
---|
| 105 | static void
|
---|
| 106 | snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
|
---|
| 107 | {
|
---|
| 108 | /* move names back from outvb to invb */
|
---|
| 109 | int v;
|
---|
| 110 | struct snmp_varbind *vbi = msg_ps->invb.head;
|
---|
| 111 | struct snmp_varbind *vbo = msg_ps->outvb.head;
|
---|
| 112 | for (v=0; v<msg_ps->vb_idx; v++) {
|
---|
| 113 | vbi->ident_len = vbo->ident_len;
|
---|
| 114 | vbo->ident_len = 0;
|
---|
| 115 | vbi->ident = vbo->ident;
|
---|
| 116 | vbo->ident = NULL;
|
---|
| 117 | vbi = vbi->next;
|
---|
| 118 | vbo = vbo->next;
|
---|
| 119 | }
|
---|
| 120 | /* free outvb */
|
---|
| 121 | snmp_varbind_list_free(&msg_ps->outvb);
|
---|
| 122 | /* we send invb back */
|
---|
| 123 | msg_ps->outvb = msg_ps->invb;
|
---|
| 124 | msg_ps->invb.head = NULL;
|
---|
| 125 | msg_ps->invb.tail = NULL;
|
---|
| 126 | msg_ps->invb.count = 0;
|
---|
| 127 | msg_ps->error_status = error;
|
---|
| 128 | /* error index must be 0 for error too big */
|
---|
| 129 | msg_ps->error_index = (error != SNMP_ES_TOOBIG) ? (1 + msg_ps->vb_idx) : 0;
|
---|
| 130 | snmp_send_response(msg_ps);
|
---|
| 131 | snmp_varbind_list_free(&msg_ps->outvb);
|
---|
| 132 | msg_ps->state = SNMP_MSG_EMPTY;
|
---|
| 133 | }
|
---|
| 134 |
|
---|
| 135 | static void
|
---|
| 136 | snmp_ok_response(struct snmp_msg_pstat *msg_ps)
|
---|
| 137 | {
|
---|
| 138 | err_t err_ret;
|
---|
| 139 |
|
---|
| 140 | err_ret = snmp_send_response(msg_ps);
|
---|
| 141 | if (err_ret == ERR_MEM)
|
---|
| 142 | {
|
---|
| 143 | /* serious memory problem, can't return tooBig */
|
---|
| 144 | }
|
---|
| 145 | else
|
---|
| 146 | {
|
---|
| 147 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
|
---|
| 148 | }
|
---|
| 149 | /* free varbinds (if available) */
|
---|
| 150 | snmp_varbind_list_free(&msg_ps->invb);
|
---|
| 151 | snmp_varbind_list_free(&msg_ps->outvb);
|
---|
| 152 | msg_ps->state = SNMP_MSG_EMPTY;
|
---|
| 153 | }
|
---|
| 154 |
|
---|
| 155 | /**
|
---|
| 156 | * Service an internal or external event for SNMP GET.
|
---|
| 157 | *
|
---|
| 158 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
|
---|
| 159 | * @param msg_ps points to the assosicated message process state
|
---|
| 160 | */
|
---|
| 161 | static void
|
---|
| 162 | snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
|
---|
| 163 | {
|
---|
| 164 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
|
---|
| 165 |
|
---|
| 166 | if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
|
---|
| 167 | {
|
---|
| 168 | struct mib_external_node *en;
|
---|
| 169 | struct snmp_name_ptr np;
|
---|
| 170 |
|
---|
| 171 | /* get_object_def() answer*/
|
---|
| 172 | en = msg_ps->ext_mib_node;
|
---|
| 173 | np = msg_ps->ext_name_ptr;
|
---|
| 174 |
|
---|
| 175 | /* translate answer into a known lifeform */
|
---|
| 176 | en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
|
---|
| 177 | if ((msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) &&
|
---|
| 178 | (msg_ps->ext_object_def.access & MIB_ACCESS_READ))
|
---|
| 179 | {
|
---|
| 180 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
|
---|
| 181 | en->get_value_q(request_id, &msg_ps->ext_object_def);
|
---|
| 182 | }
|
---|
| 183 | else
|
---|
| 184 | {
|
---|
| 185 | en->get_object_def_pc(request_id, np.ident_len, np.ident);
|
---|
| 186 | /* search failed, object id points to unknown object (nosuchname) */
|
---|
| 187 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 188 | }
|
---|
| 189 | }
|
---|
| 190 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
|
---|
| 191 | {
|
---|
| 192 | struct mib_external_node *en;
|
---|
| 193 | struct snmp_varbind *vb;
|
---|
| 194 |
|
---|
| 195 | /* get_value() answer */
|
---|
| 196 | en = msg_ps->ext_mib_node;
|
---|
| 197 |
|
---|
| 198 | /* allocate output varbind */
|
---|
| 199 | vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
|
---|
| 200 | if (vb != NULL)
|
---|
| 201 | {
|
---|
| 202 | vb->next = NULL;
|
---|
| 203 | vb->prev = NULL;
|
---|
| 204 |
|
---|
| 205 | /* move name from invb to outvb */
|
---|
| 206 | vb->ident = msg_ps->vb_ptr->ident;
|
---|
| 207 | vb->ident_len = msg_ps->vb_ptr->ident_len;
|
---|
| 208 | /* ensure this memory is refereced once only */
|
---|
| 209 | msg_ps->vb_ptr->ident = NULL;
|
---|
| 210 | msg_ps->vb_ptr->ident_len = 0;
|
---|
| 211 |
|
---|
| 212 | vb->value_type = msg_ps->ext_object_def.asn_type;
|
---|
| 213 | LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
|
---|
| 214 | vb->value_len = (u8_t)msg_ps->ext_object_def.v_len;
|
---|
| 215 | if (vb->value_len > 0)
|
---|
| 216 | {
|
---|
| 217 | LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
|
---|
| 218 | vb->value = memp_malloc(MEMP_SNMP_VALUE);
|
---|
| 219 | if (vb->value != NULL)
|
---|
| 220 | {
|
---|
| 221 | en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
|
---|
| 222 | snmp_varbind_tail_add(&msg_ps->outvb, vb);
|
---|
| 223 | /* search again (if vb_idx < msg_ps->invb.count) */
|
---|
| 224 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 225 | msg_ps->vb_idx += 1;
|
---|
| 226 | }
|
---|
| 227 | else
|
---|
| 228 | {
|
---|
| 229 | en->get_value_pc(request_id, &msg_ps->ext_object_def);
|
---|
| 230 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
|
---|
| 231 | msg_ps->vb_ptr->ident = vb->ident;
|
---|
| 232 | msg_ps->vb_ptr->ident_len = vb->ident_len;
|
---|
| 233 | memp_free(MEMP_SNMP_VARBIND, vb);
|
---|
| 234 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
|
---|
| 235 | }
|
---|
| 236 | }
|
---|
| 237 | else
|
---|
| 238 | {
|
---|
| 239 | /* vb->value_len == 0, empty value (e.g. empty string) */
|
---|
| 240 | en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
|
---|
| 241 | vb->value = NULL;
|
---|
| 242 | snmp_varbind_tail_add(&msg_ps->outvb, vb);
|
---|
| 243 | /* search again (if vb_idx < msg_ps->invb.count) */
|
---|
| 244 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 245 | msg_ps->vb_idx += 1;
|
---|
| 246 | }
|
---|
| 247 | }
|
---|
| 248 | else
|
---|
| 249 | {
|
---|
| 250 | en->get_value_pc(request_id, &msg_ps->ext_object_def);
|
---|
| 251 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
|
---|
| 252 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
|
---|
| 253 | }
|
---|
| 254 | }
|
---|
| 255 |
|
---|
| 256 | while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
---|
| 257 | (msg_ps->vb_idx < msg_ps->invb.count))
|
---|
| 258 | {
|
---|
| 259 | struct mib_node *mn;
|
---|
| 260 | struct snmp_name_ptr np;
|
---|
| 261 |
|
---|
| 262 | if (msg_ps->vb_idx == 0)
|
---|
| 263 | {
|
---|
| 264 | msg_ps->vb_ptr = msg_ps->invb.head;
|
---|
| 265 | }
|
---|
| 266 | else
|
---|
| 267 | {
|
---|
| 268 | msg_ps->vb_ptr = msg_ps->vb_ptr->next;
|
---|
| 269 | }
|
---|
| 270 | /** test object identifier for .iso.org.dod.internet prefix */
|
---|
| 271 | if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
|
---|
| 272 | {
|
---|
| 273 | mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
|
---|
| 274 | msg_ps->vb_ptr->ident + 4, &np);
|
---|
| 275 | if (mn != NULL)
|
---|
| 276 | {
|
---|
| 277 | if (mn->node_type == MIB_NODE_EX)
|
---|
| 278 | {
|
---|
| 279 | /* external object */
|
---|
| 280 | struct mib_external_node *en = (struct mib_external_node*)mn;
|
---|
| 281 |
|
---|
| 282 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
|
---|
| 283 | /* save en && args in msg_ps!! */
|
---|
| 284 | msg_ps->ext_mib_node = en;
|
---|
| 285 | msg_ps->ext_name_ptr = np;
|
---|
| 286 |
|
---|
| 287 | en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
|
---|
| 288 | }
|
---|
| 289 | else
|
---|
| 290 | {
|
---|
| 291 | /* internal object */
|
---|
| 292 | struct obj_def object_def;
|
---|
| 293 |
|
---|
| 294 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
|
---|
| 295 | mn->get_object_def(np.ident_len, np.ident, &object_def);
|
---|
| 296 | if ((object_def.instance != MIB_OBJECT_NONE) &&
|
---|
| 297 | (object_def.access & MIB_ACCESS_READ))
|
---|
| 298 | {
|
---|
| 299 | mn = mn;
|
---|
| 300 | }
|
---|
| 301 | else
|
---|
| 302 | {
|
---|
| 303 | /* search failed, object id points to unknown object (nosuchname) */
|
---|
| 304 | mn = NULL;
|
---|
| 305 | }
|
---|
| 306 | if (mn != NULL)
|
---|
| 307 | {
|
---|
| 308 | struct snmp_varbind *vb;
|
---|
| 309 |
|
---|
| 310 | msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
|
---|
| 311 | /* allocate output varbind */
|
---|
| 312 | vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
|
---|
| 313 | if (vb != NULL)
|
---|
| 314 | {
|
---|
| 315 | vb->next = NULL;
|
---|
| 316 | vb->prev = NULL;
|
---|
| 317 |
|
---|
| 318 | /* move name from invb to outvb */
|
---|
| 319 | vb->ident = msg_ps->vb_ptr->ident;
|
---|
| 320 | vb->ident_len = msg_ps->vb_ptr->ident_len;
|
---|
| 321 | /* ensure this memory is refereced once only */
|
---|
| 322 | msg_ps->vb_ptr->ident = NULL;
|
---|
| 323 | msg_ps->vb_ptr->ident_len = 0;
|
---|
| 324 |
|
---|
| 325 | vb->value_type = object_def.asn_type;
|
---|
| 326 | LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
|
---|
| 327 | vb->value_len = (u8_t)object_def.v_len;
|
---|
| 328 | if (vb->value_len > 0)
|
---|
| 329 | {
|
---|
| 330 | LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low",
|
---|
| 331 | vb->value_len <= SNMP_MAX_VALUE_SIZE);
|
---|
| 332 | vb->value = memp_malloc(MEMP_SNMP_VALUE);
|
---|
| 333 | if (vb->value != NULL)
|
---|
| 334 | {
|
---|
| 335 | mn->get_value(&object_def, vb->value_len, vb->value);
|
---|
| 336 | snmp_varbind_tail_add(&msg_ps->outvb, vb);
|
---|
| 337 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 338 | msg_ps->vb_idx += 1;
|
---|
| 339 | }
|
---|
| 340 | else
|
---|
| 341 | {
|
---|
| 342 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
|
---|
| 343 | msg_ps->vb_ptr->ident = vb->ident;
|
---|
| 344 | msg_ps->vb_ptr->ident_len = vb->ident_len;
|
---|
| 345 | vb->ident = NULL;
|
---|
| 346 | vb->ident_len = 0;
|
---|
| 347 | memp_free(MEMP_SNMP_VARBIND, vb);
|
---|
| 348 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
|
---|
| 349 | }
|
---|
| 350 | }
|
---|
| 351 | else
|
---|
| 352 | {
|
---|
| 353 | /* vb->value_len == 0, empty value (e.g. empty string) */
|
---|
| 354 | vb->value = NULL;
|
---|
| 355 | snmp_varbind_tail_add(&msg_ps->outvb, vb);
|
---|
| 356 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 357 | msg_ps->vb_idx += 1;
|
---|
| 358 | }
|
---|
| 359 | }
|
---|
| 360 | else
|
---|
| 361 | {
|
---|
| 362 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n"));
|
---|
| 363 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
|
---|
| 364 | }
|
---|
| 365 | }
|
---|
| 366 | }
|
---|
| 367 | }
|
---|
| 368 | }
|
---|
| 369 | else
|
---|
| 370 | {
|
---|
| 371 | mn = NULL;
|
---|
| 372 | }
|
---|
| 373 | if (mn == NULL)
|
---|
| 374 | {
|
---|
| 375 | /* mn == NULL, noSuchName */
|
---|
| 376 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 377 | }
|
---|
| 378 | }
|
---|
| 379 | if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
---|
| 380 | (msg_ps->vb_idx == msg_ps->invb.count))
|
---|
| 381 | {
|
---|
| 382 | snmp_ok_response(msg_ps);
|
---|
| 383 | }
|
---|
| 384 | }
|
---|
| 385 |
|
---|
| 386 | /**
|
---|
| 387 | * Service an internal or external event for SNMP GETNEXT.
|
---|
| 388 | *
|
---|
| 389 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
|
---|
| 390 | * @param msg_ps points to the assosicated message process state
|
---|
| 391 | */
|
---|
| 392 | static void
|
---|
| 393 | snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
|
---|
| 394 | {
|
---|
| 395 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
|
---|
| 396 |
|
---|
| 397 | if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
|
---|
| 398 | {
|
---|
| 399 | struct mib_external_node *en;
|
---|
| 400 |
|
---|
| 401 | /* get_object_def() answer*/
|
---|
| 402 | en = msg_ps->ext_mib_node;
|
---|
| 403 |
|
---|
| 404 | /* translate answer into a known lifeform */
|
---|
| 405 | en->get_object_def_a(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1], &msg_ps->ext_object_def);
|
---|
| 406 | if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
|
---|
| 407 | {
|
---|
| 408 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
|
---|
| 409 | en->get_value_q(request_id, &msg_ps->ext_object_def);
|
---|
| 410 | }
|
---|
| 411 | else
|
---|
| 412 | {
|
---|
| 413 | en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
|
---|
| 414 | /* search failed, object id points to unknown object (nosuchname) */
|
---|
| 415 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 416 | }
|
---|
| 417 | }
|
---|
| 418 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
|
---|
| 419 | {
|
---|
| 420 | struct mib_external_node *en;
|
---|
| 421 | struct snmp_varbind *vb;
|
---|
| 422 |
|
---|
| 423 | /* get_value() answer */
|
---|
| 424 | en = msg_ps->ext_mib_node;
|
---|
| 425 |
|
---|
| 426 | LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
|
---|
| 427 | vb = snmp_varbind_alloc(&msg_ps->ext_oid,
|
---|
| 428 | msg_ps->ext_object_def.asn_type,
|
---|
| 429 | (u8_t)msg_ps->ext_object_def.v_len);
|
---|
| 430 | if (vb != NULL)
|
---|
| 431 | {
|
---|
| 432 | en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
|
---|
| 433 | snmp_varbind_tail_add(&msg_ps->outvb, vb);
|
---|
| 434 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 435 | msg_ps->vb_idx += 1;
|
---|
| 436 | }
|
---|
| 437 | else
|
---|
| 438 | {
|
---|
| 439 | en->get_value_pc(request_id, &msg_ps->ext_object_def);
|
---|
| 440 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
|
---|
| 441 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
|
---|
| 442 | }
|
---|
| 443 | }
|
---|
| 444 |
|
---|
| 445 | while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
---|
| 446 | (msg_ps->vb_idx < msg_ps->invb.count))
|
---|
| 447 | {
|
---|
| 448 | struct mib_node *mn;
|
---|
| 449 | struct snmp_obj_id oid;
|
---|
| 450 |
|
---|
| 451 | if (msg_ps->vb_idx == 0)
|
---|
| 452 | {
|
---|
| 453 | msg_ps->vb_ptr = msg_ps->invb.head;
|
---|
| 454 | }
|
---|
| 455 | else
|
---|
| 456 | {
|
---|
| 457 | msg_ps->vb_ptr = msg_ps->vb_ptr->next;
|
---|
| 458 | }
|
---|
| 459 | if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
|
---|
| 460 | {
|
---|
| 461 | if (msg_ps->vb_ptr->ident_len > 3)
|
---|
| 462 | {
|
---|
| 463 | /* can offset ident_len and ident */
|
---|
| 464 | mn = snmp_expand_tree((struct mib_node*)&internet,
|
---|
| 465 | msg_ps->vb_ptr->ident_len - 4,
|
---|
| 466 | msg_ps->vb_ptr->ident + 4, &oid);
|
---|
| 467 | }
|
---|
| 468 | else
|
---|
| 469 | {
|
---|
| 470 | /* can't offset ident_len -4, ident + 4 */
|
---|
| 471 | mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid);
|
---|
| 472 | }
|
---|
| 473 | }
|
---|
| 474 | else
|
---|
| 475 | {
|
---|
| 476 | mn = NULL;
|
---|
| 477 | }
|
---|
| 478 | if (mn != NULL)
|
---|
| 479 | {
|
---|
| 480 | if (mn->node_type == MIB_NODE_EX)
|
---|
| 481 | {
|
---|
| 482 | /* external object */
|
---|
| 483 | struct mib_external_node *en = (struct mib_external_node*)mn;
|
---|
| 484 |
|
---|
| 485 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
|
---|
| 486 | /* save en && args in msg_ps!! */
|
---|
| 487 | msg_ps->ext_mib_node = en;
|
---|
| 488 | msg_ps->ext_oid = oid;
|
---|
| 489 |
|
---|
| 490 | en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]);
|
---|
| 491 | }
|
---|
| 492 | else
|
---|
| 493 | {
|
---|
| 494 | /* internal object */
|
---|
| 495 | struct obj_def object_def;
|
---|
| 496 | struct snmp_varbind *vb;
|
---|
| 497 |
|
---|
| 498 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
|
---|
| 499 | mn->get_object_def(1, &oid.id[oid.len - 1], &object_def);
|
---|
| 500 |
|
---|
| 501 | LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
|
---|
| 502 | vb = snmp_varbind_alloc(&oid, object_def.asn_type, (u8_t)object_def.v_len);
|
---|
| 503 | if (vb != NULL)
|
---|
| 504 | {
|
---|
| 505 | msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
|
---|
| 506 | mn->get_value(&object_def, object_def.v_len, vb->value);
|
---|
| 507 | snmp_varbind_tail_add(&msg_ps->outvb, vb);
|
---|
| 508 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 509 | msg_ps->vb_idx += 1;
|
---|
| 510 | }
|
---|
| 511 | else
|
---|
| 512 | {
|
---|
| 513 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n"));
|
---|
| 514 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
|
---|
| 515 | }
|
---|
| 516 | }
|
---|
| 517 | }
|
---|
| 518 | if (mn == NULL)
|
---|
| 519 | {
|
---|
| 520 | /* mn == NULL, noSuchName */
|
---|
| 521 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 522 | }
|
---|
| 523 | }
|
---|
| 524 | if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
---|
| 525 | (msg_ps->vb_idx == msg_ps->invb.count))
|
---|
| 526 | {
|
---|
| 527 | snmp_ok_response(msg_ps);
|
---|
| 528 | }
|
---|
| 529 | }
|
---|
| 530 |
|
---|
| 531 | /**
|
---|
| 532 | * Service an internal or external event for SNMP SET.
|
---|
| 533 | *
|
---|
| 534 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
|
---|
| 535 | * @param msg_ps points to the assosicated message process state
|
---|
| 536 | */
|
---|
| 537 | static void
|
---|
| 538 | snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
|
---|
| 539 | {
|
---|
| 540 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
|
---|
| 541 |
|
---|
| 542 | if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
|
---|
| 543 | {
|
---|
| 544 | struct mib_external_node *en;
|
---|
| 545 | struct snmp_name_ptr np;
|
---|
| 546 |
|
---|
| 547 | /* get_object_def() answer*/
|
---|
| 548 | en = msg_ps->ext_mib_node;
|
---|
| 549 | np = msg_ps->ext_name_ptr;
|
---|
| 550 |
|
---|
| 551 | /* translate answer into a known lifeform */
|
---|
| 552 | en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
|
---|
| 553 | if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
|
---|
| 554 | {
|
---|
| 555 | msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST;
|
---|
| 556 | en->set_test_q(request_id, &msg_ps->ext_object_def);
|
---|
| 557 | }
|
---|
| 558 | else
|
---|
| 559 | {
|
---|
| 560 | en->get_object_def_pc(request_id, np.ident_len, np.ident);
|
---|
| 561 | /* search failed, object id points to unknown object (nosuchname) */
|
---|
| 562 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 563 | }
|
---|
| 564 | }
|
---|
| 565 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST)
|
---|
| 566 | {
|
---|
| 567 | struct mib_external_node *en;
|
---|
| 568 |
|
---|
| 569 | /* set_test() answer*/
|
---|
| 570 | en = msg_ps->ext_mib_node;
|
---|
| 571 |
|
---|
| 572 | if (msg_ps->ext_object_def.access & MIB_ACCESS_WRITE)
|
---|
| 573 | {
|
---|
| 574 | if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) &&
|
---|
| 575 | (en->set_test_a(request_id,&msg_ps->ext_object_def,
|
---|
| 576 | msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
|
---|
| 577 | {
|
---|
| 578 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 579 | msg_ps->vb_idx += 1;
|
---|
| 580 | }
|
---|
| 581 | else
|
---|
| 582 | {
|
---|
| 583 | en->set_test_pc(request_id,&msg_ps->ext_object_def);
|
---|
| 584 | /* bad value */
|
---|
| 585 | snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
|
---|
| 586 | }
|
---|
| 587 | }
|
---|
| 588 | else
|
---|
| 589 | {
|
---|
| 590 | en->set_test_pc(request_id,&msg_ps->ext_object_def);
|
---|
| 591 | /* object not available for set */
|
---|
| 592 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 593 | }
|
---|
| 594 | }
|
---|
| 595 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S)
|
---|
| 596 | {
|
---|
| 597 | struct mib_external_node *en;
|
---|
| 598 | struct snmp_name_ptr np;
|
---|
| 599 |
|
---|
| 600 | /* get_object_def() answer*/
|
---|
| 601 | en = msg_ps->ext_mib_node;
|
---|
| 602 | np = msg_ps->ext_name_ptr;
|
---|
| 603 |
|
---|
| 604 | /* translate answer into a known lifeform */
|
---|
| 605 | en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
|
---|
| 606 | if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
|
---|
| 607 | {
|
---|
| 608 | msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE;
|
---|
| 609 | en->set_value_q(request_id, &msg_ps->ext_object_def,
|
---|
| 610 | msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
|
---|
| 611 | }
|
---|
| 612 | else
|
---|
| 613 | {
|
---|
| 614 | en->get_object_def_pc(request_id, np.ident_len, np.ident);
|
---|
| 615 | /* set_value failed, object has disappeared for some odd reason?? */
|
---|
| 616 | snmp_error_response(msg_ps,SNMP_ES_GENERROR);
|
---|
| 617 | }
|
---|
| 618 | }
|
---|
| 619 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE)
|
---|
| 620 | {
|
---|
| 621 | struct mib_external_node *en;
|
---|
| 622 |
|
---|
| 623 | /** set_value_a() */
|
---|
| 624 | en = msg_ps->ext_mib_node;
|
---|
| 625 | en->set_value_a(request_id, &msg_ps->ext_object_def,
|
---|
| 626 | msg_ps->vb_ptr->value_len, msg_ps->vb_ptr->value);
|
---|
| 627 |
|
---|
| 628 | /** @todo use set_value_pc() if toobig */
|
---|
| 629 | msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
|
---|
| 630 | msg_ps->vb_idx += 1;
|
---|
| 631 | }
|
---|
| 632 |
|
---|
| 633 | /* test all values before setting */
|
---|
| 634 | while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
---|
| 635 | (msg_ps->vb_idx < msg_ps->invb.count))
|
---|
| 636 | {
|
---|
| 637 | struct mib_node *mn;
|
---|
| 638 | struct snmp_name_ptr np;
|
---|
| 639 |
|
---|
| 640 | if (msg_ps->vb_idx == 0)
|
---|
| 641 | {
|
---|
| 642 | msg_ps->vb_ptr = msg_ps->invb.head;
|
---|
| 643 | }
|
---|
| 644 | else
|
---|
| 645 | {
|
---|
| 646 | msg_ps->vb_ptr = msg_ps->vb_ptr->next;
|
---|
| 647 | }
|
---|
| 648 | /** test object identifier for .iso.org.dod.internet prefix */
|
---|
| 649 | if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
|
---|
| 650 | {
|
---|
| 651 | mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
|
---|
| 652 | msg_ps->vb_ptr->ident + 4, &np);
|
---|
| 653 | if (mn != NULL)
|
---|
| 654 | {
|
---|
| 655 | if (mn->node_type == MIB_NODE_EX)
|
---|
| 656 | {
|
---|
| 657 | /* external object */
|
---|
| 658 | struct mib_external_node *en = (struct mib_external_node*)mn;
|
---|
| 659 |
|
---|
| 660 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
|
---|
| 661 | /* save en && args in msg_ps!! */
|
---|
| 662 | msg_ps->ext_mib_node = en;
|
---|
| 663 | msg_ps->ext_name_ptr = np;
|
---|
| 664 |
|
---|
| 665 | en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
|
---|
| 666 | }
|
---|
| 667 | else
|
---|
| 668 | {
|
---|
| 669 | /* internal object */
|
---|
| 670 | struct obj_def object_def;
|
---|
| 671 |
|
---|
| 672 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
|
---|
| 673 | mn->get_object_def(np.ident_len, np.ident, &object_def);
|
---|
| 674 | if (object_def.instance != MIB_OBJECT_NONE)
|
---|
| 675 | {
|
---|
| 676 | mn = mn;
|
---|
| 677 | }
|
---|
| 678 | else
|
---|
| 679 | {
|
---|
| 680 | /* search failed, object id points to unknown object (nosuchname) */
|
---|
| 681 | mn = NULL;
|
---|
| 682 | }
|
---|
| 683 | if (mn != NULL)
|
---|
| 684 | {
|
---|
| 685 | msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST;
|
---|
| 686 |
|
---|
| 687 | if (object_def.access & MIB_ACCESS_WRITE)
|
---|
| 688 | {
|
---|
| 689 | if ((object_def.asn_type == msg_ps->vb_ptr->value_type) &&
|
---|
| 690 | (mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
|
---|
| 691 | {
|
---|
| 692 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 693 | msg_ps->vb_idx += 1;
|
---|
| 694 | }
|
---|
| 695 | else
|
---|
| 696 | {
|
---|
| 697 | /* bad value */
|
---|
| 698 | snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
|
---|
| 699 | }
|
---|
| 700 | }
|
---|
| 701 | else
|
---|
| 702 | {
|
---|
| 703 | /* object not available for set */
|
---|
| 704 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 705 | }
|
---|
| 706 | }
|
---|
| 707 | }
|
---|
| 708 | }
|
---|
| 709 | }
|
---|
| 710 | else
|
---|
| 711 | {
|
---|
| 712 | mn = NULL;
|
---|
| 713 | }
|
---|
| 714 | if (mn == NULL)
|
---|
| 715 | {
|
---|
| 716 | /* mn == NULL, noSuchName */
|
---|
| 717 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
|
---|
| 718 | }
|
---|
| 719 | }
|
---|
| 720 |
|
---|
| 721 | if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
|
---|
| 722 | (msg_ps->vb_idx == msg_ps->invb.count))
|
---|
| 723 | {
|
---|
| 724 | msg_ps->vb_idx = 0;
|
---|
| 725 | msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
|
---|
| 726 | }
|
---|
| 727 |
|
---|
| 728 | /* set all values "atomically" (be as "atomic" as possible) */
|
---|
| 729 | while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
|
---|
| 730 | (msg_ps->vb_idx < msg_ps->invb.count))
|
---|
| 731 | {
|
---|
| 732 | struct mib_node *mn;
|
---|
| 733 | struct snmp_name_ptr np;
|
---|
| 734 |
|
---|
| 735 | if (msg_ps->vb_idx == 0)
|
---|
| 736 | {
|
---|
| 737 | msg_ps->vb_ptr = msg_ps->invb.head;
|
---|
| 738 | }
|
---|
| 739 | else
|
---|
| 740 | {
|
---|
| 741 | msg_ps->vb_ptr = msg_ps->vb_ptr->next;
|
---|
| 742 | }
|
---|
| 743 | /* skip iso prefix test, was done previously while settesting() */
|
---|
| 744 | mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
|
---|
| 745 | msg_ps->vb_ptr->ident + 4, &np);
|
---|
| 746 | /* check if object is still available
|
---|
| 747 | (e.g. external hot-plug thingy present?) */
|
---|
| 748 | if (mn != NULL)
|
---|
| 749 | {
|
---|
| 750 | if (mn->node_type == MIB_NODE_EX)
|
---|
| 751 | {
|
---|
| 752 | /* external object */
|
---|
| 753 | struct mib_external_node *en = (struct mib_external_node*)mn;
|
---|
| 754 |
|
---|
| 755 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S;
|
---|
| 756 | /* save en && args in msg_ps!! */
|
---|
| 757 | msg_ps->ext_mib_node = en;
|
---|
| 758 | msg_ps->ext_name_ptr = np;
|
---|
| 759 |
|
---|
| 760 | en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
|
---|
| 761 | }
|
---|
| 762 | else
|
---|
| 763 | {
|
---|
| 764 | /* internal object */
|
---|
| 765 | struct obj_def object_def;
|
---|
| 766 |
|
---|
| 767 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S;
|
---|
| 768 | mn->get_object_def(np.ident_len, np.ident, &object_def);
|
---|
| 769 | msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
|
---|
| 770 | mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
|
---|
| 771 | msg_ps->vb_idx += 1;
|
---|
| 772 | }
|
---|
| 773 | }
|
---|
| 774 | }
|
---|
| 775 | if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
|
---|
| 776 | (msg_ps->vb_idx == msg_ps->invb.count))
|
---|
| 777 | {
|
---|
| 778 | /* simply echo the input if we can set it
|
---|
| 779 | @todo do we need to return the actual value?
|
---|
| 780 | e.g. if value is silently modified or behaves sticky? */
|
---|
| 781 | msg_ps->outvb = msg_ps->invb;
|
---|
| 782 | msg_ps->invb.head = NULL;
|
---|
| 783 | msg_ps->invb.tail = NULL;
|
---|
| 784 | msg_ps->invb.count = 0;
|
---|
| 785 | snmp_ok_response(msg_ps);
|
---|
| 786 | }
|
---|
| 787 | }
|
---|
| 788 |
|
---|
| 789 |
|
---|
| 790 | /**
|
---|
| 791 | * Handle one internal or external event.
|
---|
| 792 | * Called for one async event. (recv external/private answer)
|
---|
| 793 | *
|
---|
| 794 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
|
---|
| 795 | */
|
---|
| 796 | void
|
---|
| 797 | snmp_msg_event(u8_t request_id)
|
---|
| 798 | {
|
---|
| 799 | struct snmp_msg_pstat *msg_ps;
|
---|
| 800 |
|
---|
| 801 | if (request_id < SNMP_CONCURRENT_REQUESTS)
|
---|
| 802 | {
|
---|
| 803 | msg_ps = &msg_input_list[request_id];
|
---|
| 804 | if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ)
|
---|
| 805 | {
|
---|
| 806 | snmp_msg_getnext_event(request_id, msg_ps);
|
---|
| 807 | }
|
---|
| 808 | else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ)
|
---|
| 809 | {
|
---|
| 810 | snmp_msg_get_event(request_id, msg_ps);
|
---|
| 811 | }
|
---|
| 812 | else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)
|
---|
| 813 | {
|
---|
| 814 | snmp_msg_set_event(request_id, msg_ps);
|
---|
| 815 | }
|
---|
| 816 | }
|
---|
| 817 | }
|
---|
| 818 |
|
---|
| 819 |
|
---|
| 820 | /* lwIP UDP receive callback function */
|
---|
| 821 | static void
|
---|
| 822 | snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
|
---|
| 823 | {
|
---|
| 824 | struct snmp_msg_pstat *msg_ps;
|
---|
| 825 | u8_t req_idx;
|
---|
| 826 | err_t err_ret;
|
---|
| 827 | u16_t payload_len = p->tot_len;
|
---|
| 828 | u16_t payload_ofs = 0;
|
---|
| 829 | u16_t varbind_ofs = 0;
|
---|
| 830 |
|
---|
| 831 | /* suppress unused argument warning */
|
---|
| 832 | LWIP_UNUSED_ARG(arg);
|
---|
| 833 |
|
---|
| 834 | /* traverse input message process list, look for SNMP_MSG_EMPTY */
|
---|
| 835 | msg_ps = &msg_input_list[0];
|
---|
| 836 | req_idx = 0;
|
---|
| 837 | while ((req_idx < SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY))
|
---|
| 838 | {
|
---|
| 839 | req_idx++;
|
---|
| 840 | msg_ps++;
|
---|
| 841 | }
|
---|
| 842 | if (req_idx == SNMP_CONCURRENT_REQUESTS)
|
---|
| 843 | {
|
---|
| 844 | /* exceeding number of concurrent requests */
|
---|
| 845 | pbuf_free(p);
|
---|
| 846 | return;
|
---|
| 847 | }
|
---|
| 848 |
|
---|
| 849 | /* accepting request */
|
---|
| 850 | snmp_inc_snmpinpkts();
|
---|
| 851 | /* record used 'protocol control block' */
|
---|
| 852 | msg_ps->pcb = pcb;
|
---|
| 853 | /* source address (network order) */
|
---|
| 854 | msg_ps->sip = *addr;
|
---|
| 855 | /* source port (host order (lwIP oddity)) */
|
---|
| 856 | msg_ps->sp = port;
|
---|
| 857 |
|
---|
| 858 | /* check total length, version, community, pdu type */
|
---|
| 859 | err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
|
---|
| 860 | /* Only accept requests and requests without error (be robust) */
|
---|
| 861 | /* Reject response and trap headers or error requests as input! */
|
---|
| 862 | if ((err_ret != ERR_OK) ||
|
---|
| 863 | ((msg_ps->rt != SNMP_ASN1_PDU_GET_REQ) &&
|
---|
| 864 | (msg_ps->rt != SNMP_ASN1_PDU_GET_NEXT_REQ) &&
|
---|
| 865 | (msg_ps->rt != SNMP_ASN1_PDU_SET_REQ)) ||
|
---|
| 866 | ((msg_ps->error_status != SNMP_ES_NOERROR) ||
|
---|
| 867 | (msg_ps->error_index != 0)) )
|
---|
| 868 | {
|
---|
| 869 | /* header check failed drop request silently, do not return error! */
|
---|
| 870 | pbuf_free(p);
|
---|
| 871 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
|
---|
| 872 | return;
|
---|
| 873 | }
|
---|
| 874 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
|
---|
| 875 |
|
---|
| 876 | /* Builds a list of variable bindings. Copy the varbinds from the pbuf
|
---|
| 877 | chain to glue them when these are divided over two or more pbuf's. */
|
---|
| 878 | err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
|
---|
| 879 | /* we've decoded the incoming message, release input msg now */
|
---|
| 880 | pbuf_free(p);
|
---|
| 881 | if ((err_ret != ERR_OK) || (msg_ps->invb.count == 0))
|
---|
| 882 | {
|
---|
| 883 | /* varbind-list decode failed, or varbind list empty.
|
---|
| 884 | drop request silently, do not return error!
|
---|
| 885 | (errors are only returned for a specific varbind failure) */
|
---|
| 886 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
|
---|
| 887 | return;
|
---|
| 888 | }
|
---|
| 889 |
|
---|
| 890 | msg_ps->error_status = SNMP_ES_NOERROR;
|
---|
| 891 | msg_ps->error_index = 0;
|
---|
| 892 | /* find object for each variable binding */
|
---|
| 893 | msg_ps->state = SNMP_MSG_SEARCH_OBJ;
|
---|
| 894 | /* first variable binding from list to inspect */
|
---|
| 895 | msg_ps->vb_idx = 0;
|
---|
| 896 |
|
---|
| 897 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
|
---|
| 898 |
|
---|
| 899 | /* handle input event and as much objects as possible in one go */
|
---|
| 900 | snmp_msg_event(req_idx);
|
---|
| 901 | }
|
---|
| 902 |
|
---|
| 903 | /**
|
---|
| 904 | * Checks and decodes incoming SNMP message header, logs header errors.
|
---|
| 905 | *
|
---|
| 906 | * @param p points to pbuf chain of SNMP message (UDP payload)
|
---|
| 907 | * @param ofs points to first octet of SNMP message
|
---|
| 908 | * @param pdu_len the length of the UDP payload
|
---|
| 909 | * @param ofs_ret returns the ofset of the variable bindings
|
---|
| 910 | * @param m_stat points to the current message request state return
|
---|
| 911 | * @return
|
---|
| 912 | * - ERR_OK SNMP header is sane and accepted
|
---|
| 913 | * - ERR_ARG SNMP header is either malformed or rejected
|
---|
| 914 | */
|
---|
| 915 | static err_t
|
---|
| 916 | snmp_pdu_header_check(struct pbuf *p, u16_t ofs, u16_t pdu_len, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
|
---|
| 917 | {
|
---|
| 918 | err_t derr;
|
---|
| 919 | u16_t len, ofs_base;
|
---|
| 920 | u8_t len_octets;
|
---|
| 921 | u8_t type;
|
---|
| 922 | s32_t version;
|
---|
| 923 |
|
---|
| 924 | ofs_base = ofs;
|
---|
| 925 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 926 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 927 | if ((derr != ERR_OK) ||
|
---|
| 928 | (pdu_len != (1 + len_octets + len)) ||
|
---|
| 929 | (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
|
---|
| 930 | {
|
---|
| 931 | snmp_inc_snmpinasnparseerrs();
|
---|
| 932 | return ERR_ARG;
|
---|
| 933 | }
|
---|
| 934 | ofs += (1 + len_octets);
|
---|
| 935 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 936 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 937 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
---|
| 938 | {
|
---|
| 939 | /* can't decode or no integer (version) */
|
---|
| 940 | snmp_inc_snmpinasnparseerrs();
|
---|
| 941 | return ERR_ARG;
|
---|
| 942 | }
|
---|
| 943 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version);
|
---|
| 944 | if (derr != ERR_OK)
|
---|
| 945 | {
|
---|
| 946 | /* can't decode */
|
---|
| 947 | snmp_inc_snmpinasnparseerrs();
|
---|
| 948 | return ERR_ARG;
|
---|
| 949 | }
|
---|
| 950 | if (version != 0)
|
---|
| 951 | {
|
---|
| 952 | /* not version 1 */
|
---|
| 953 | snmp_inc_snmpinbadversions();
|
---|
| 954 | return ERR_ARG;
|
---|
| 955 | }
|
---|
| 956 | ofs += (1 + len_octets + len);
|
---|
| 957 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 958 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 959 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)))
|
---|
| 960 | {
|
---|
| 961 | /* can't decode or no octet string (community) */
|
---|
| 962 | snmp_inc_snmpinasnparseerrs();
|
---|
| 963 | return ERR_ARG;
|
---|
| 964 | }
|
---|
| 965 | derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community);
|
---|
| 966 | if (derr != ERR_OK)
|
---|
| 967 | {
|
---|
| 968 | snmp_inc_snmpinasnparseerrs();
|
---|
| 969 | return ERR_ARG;
|
---|
| 970 | }
|
---|
| 971 | /* add zero terminator */
|
---|
| 972 | len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN));
|
---|
| 973 | m_stat->community[len] = 0;
|
---|
| 974 | m_stat->com_strlen = (u8_t)len;
|
---|
| 975 | if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0)
|
---|
| 976 | {
|
---|
| 977 | /** @todo: move this if we need to check more names */
|
---|
| 978 | snmp_inc_snmpinbadcommunitynames();
|
---|
| 979 | snmp_authfail_trap();
|
---|
| 980 | return ERR_ARG;
|
---|
| 981 | }
|
---|
| 982 | ofs += (1 + len_octets + len);
|
---|
| 983 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 984 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 985 | if (derr != ERR_OK)
|
---|
| 986 | {
|
---|
| 987 | snmp_inc_snmpinasnparseerrs();
|
---|
| 988 | return ERR_ARG;
|
---|
| 989 | }
|
---|
| 990 | switch(type)
|
---|
| 991 | {
|
---|
| 992 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ):
|
---|
| 993 | /* GetRequest PDU */
|
---|
| 994 | snmp_inc_snmpingetrequests();
|
---|
| 995 | derr = ERR_OK;
|
---|
| 996 | break;
|
---|
| 997 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ):
|
---|
| 998 | /* GetNextRequest PDU */
|
---|
| 999 | snmp_inc_snmpingetnexts();
|
---|
| 1000 | derr = ERR_OK;
|
---|
| 1001 | break;
|
---|
| 1002 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP):
|
---|
| 1003 | /* GetResponse PDU */
|
---|
| 1004 | snmp_inc_snmpingetresponses();
|
---|
| 1005 | derr = ERR_ARG;
|
---|
| 1006 | break;
|
---|
| 1007 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ):
|
---|
| 1008 | /* SetRequest PDU */
|
---|
| 1009 | snmp_inc_snmpinsetrequests();
|
---|
| 1010 | derr = ERR_OK;
|
---|
| 1011 | break;
|
---|
| 1012 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP):
|
---|
| 1013 | /* Trap PDU */
|
---|
| 1014 | snmp_inc_snmpintraps();
|
---|
| 1015 | derr = ERR_ARG;
|
---|
| 1016 | break;
|
---|
| 1017 | default:
|
---|
| 1018 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1019 | derr = ERR_ARG;
|
---|
| 1020 | break;
|
---|
| 1021 | }
|
---|
| 1022 | if (derr != ERR_OK)
|
---|
| 1023 | {
|
---|
| 1024 | /* unsupported input PDU for this agent (no parse error) */
|
---|
| 1025 | return ERR_ARG;
|
---|
| 1026 | }
|
---|
| 1027 | m_stat->rt = type & 0x1F;
|
---|
| 1028 | ofs += (1 + len_octets);
|
---|
| 1029 | if (len != (pdu_len - (ofs - ofs_base)))
|
---|
| 1030 | {
|
---|
| 1031 | /* decoded PDU length does not equal actual payload length */
|
---|
| 1032 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1033 | return ERR_ARG;
|
---|
| 1034 | }
|
---|
| 1035 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 1036 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 1037 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
---|
| 1038 | {
|
---|
| 1039 | /* can't decode or no integer (request ID) */
|
---|
| 1040 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1041 | return ERR_ARG;
|
---|
| 1042 | }
|
---|
| 1043 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid);
|
---|
| 1044 | if (derr != ERR_OK)
|
---|
| 1045 | {
|
---|
| 1046 | /* can't decode */
|
---|
| 1047 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1048 | return ERR_ARG;
|
---|
| 1049 | }
|
---|
| 1050 | ofs += (1 + len_octets + len);
|
---|
| 1051 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 1052 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 1053 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
---|
| 1054 | {
|
---|
| 1055 | /* can't decode or no integer (error-status) */
|
---|
| 1056 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1057 | return ERR_ARG;
|
---|
| 1058 | }
|
---|
| 1059 | /* must be noError (0) for incoming requests.
|
---|
| 1060 | log errors for mib-2 completeness and for debug purposes */
|
---|
| 1061 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status);
|
---|
| 1062 | if (derr != ERR_OK)
|
---|
| 1063 | {
|
---|
| 1064 | /* can't decode */
|
---|
| 1065 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1066 | return ERR_ARG;
|
---|
| 1067 | }
|
---|
| 1068 | switch (m_stat->error_status)
|
---|
| 1069 | {
|
---|
| 1070 | case SNMP_ES_TOOBIG:
|
---|
| 1071 | snmp_inc_snmpintoobigs();
|
---|
| 1072 | break;
|
---|
| 1073 | case SNMP_ES_NOSUCHNAME:
|
---|
| 1074 | snmp_inc_snmpinnosuchnames();
|
---|
| 1075 | break;
|
---|
| 1076 | case SNMP_ES_BADVALUE:
|
---|
| 1077 | snmp_inc_snmpinbadvalues();
|
---|
| 1078 | break;
|
---|
| 1079 | case SNMP_ES_READONLY:
|
---|
| 1080 | snmp_inc_snmpinreadonlys();
|
---|
| 1081 | break;
|
---|
| 1082 | case SNMP_ES_GENERROR:
|
---|
| 1083 | snmp_inc_snmpingenerrs();
|
---|
| 1084 | break;
|
---|
| 1085 | }
|
---|
| 1086 | ofs += (1 + len_octets + len);
|
---|
| 1087 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 1088 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 1089 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
|
---|
| 1090 | {
|
---|
| 1091 | /* can't decode or no integer (error-index) */
|
---|
| 1092 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1093 | return ERR_ARG;
|
---|
| 1094 | }
|
---|
| 1095 | /* must be 0 for incoming requests.
|
---|
| 1096 | decode anyway to catch bad integers (and dirty tricks) */
|
---|
| 1097 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index);
|
---|
| 1098 | if (derr != ERR_OK)
|
---|
| 1099 | {
|
---|
| 1100 | /* can't decode */
|
---|
| 1101 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1102 | return ERR_ARG;
|
---|
| 1103 | }
|
---|
| 1104 | ofs += (1 + len_octets + len);
|
---|
| 1105 | *ofs_ret = ofs;
|
---|
| 1106 | return ERR_OK;
|
---|
| 1107 | }
|
---|
| 1108 |
|
---|
| 1109 | static err_t
|
---|
| 1110 | snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
|
---|
| 1111 | {
|
---|
| 1112 | err_t derr;
|
---|
| 1113 | u16_t len, vb_len;
|
---|
| 1114 | u8_t len_octets;
|
---|
| 1115 | u8_t type;
|
---|
| 1116 |
|
---|
| 1117 | /* variable binding list */
|
---|
| 1118 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 1119 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len);
|
---|
| 1120 | if ((derr != ERR_OK) ||
|
---|
| 1121 | (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
|
---|
| 1122 | {
|
---|
| 1123 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1124 | return ERR_ARG;
|
---|
| 1125 | }
|
---|
| 1126 | ofs += (1 + len_octets);
|
---|
| 1127 |
|
---|
| 1128 | /* start with empty list */
|
---|
| 1129 | m_stat->invb.count = 0;
|
---|
| 1130 | m_stat->invb.head = NULL;
|
---|
| 1131 | m_stat->invb.tail = NULL;
|
---|
| 1132 |
|
---|
| 1133 | while (vb_len > 0)
|
---|
| 1134 | {
|
---|
| 1135 | struct snmp_obj_id oid, oid_value;
|
---|
| 1136 | struct snmp_varbind *vb;
|
---|
| 1137 |
|
---|
| 1138 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 1139 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 1140 | if ((derr != ERR_OK) ||
|
---|
| 1141 | (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) ||
|
---|
| 1142 | (len == 0) || (len > vb_len))
|
---|
| 1143 | {
|
---|
| 1144 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1145 | /* free varbinds (if available) */
|
---|
| 1146 | snmp_varbind_list_free(&m_stat->invb);
|
---|
| 1147 | return ERR_ARG;
|
---|
| 1148 | }
|
---|
| 1149 | ofs += (1 + len_octets);
|
---|
| 1150 | vb_len -= (1 + len_octets);
|
---|
| 1151 |
|
---|
| 1152 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 1153 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 1154 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)))
|
---|
| 1155 | {
|
---|
| 1156 | /* can't decode object name length */
|
---|
| 1157 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1158 | /* free varbinds (if available) */
|
---|
| 1159 | snmp_varbind_list_free(&m_stat->invb);
|
---|
| 1160 | return ERR_ARG;
|
---|
| 1161 | }
|
---|
| 1162 | derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid);
|
---|
| 1163 | if (derr != ERR_OK)
|
---|
| 1164 | {
|
---|
| 1165 | /* can't decode object name */
|
---|
| 1166 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1167 | /* free varbinds (if available) */
|
---|
| 1168 | snmp_varbind_list_free(&m_stat->invb);
|
---|
| 1169 | return ERR_ARG;
|
---|
| 1170 | }
|
---|
| 1171 | ofs += (1 + len_octets + len);
|
---|
| 1172 | vb_len -= (1 + len_octets + len);
|
---|
| 1173 |
|
---|
| 1174 | snmp_asn1_dec_type(p, ofs, &type);
|
---|
| 1175 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
|
---|
| 1176 | if (derr != ERR_OK)
|
---|
| 1177 | {
|
---|
| 1178 | /* can't decode object value length */
|
---|
| 1179 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1180 | /* free varbinds (if available) */
|
---|
| 1181 | snmp_varbind_list_free(&m_stat->invb);
|
---|
| 1182 | return ERR_ARG;
|
---|
| 1183 | }
|
---|
| 1184 |
|
---|
| 1185 | switch (type)
|
---|
| 1186 | {
|
---|
| 1187 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
|
---|
| 1188 | vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t));
|
---|
| 1189 | if (vb != NULL)
|
---|
| 1190 | {
|
---|
| 1191 | s32_t *vptr = (s32_t*)vb->value;
|
---|
| 1192 |
|
---|
| 1193 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr);
|
---|
| 1194 | snmp_varbind_tail_add(&m_stat->invb, vb);
|
---|
| 1195 | }
|
---|
| 1196 | else
|
---|
| 1197 | {
|
---|
| 1198 | derr = ERR_ARG;
|
---|
| 1199 | }
|
---|
| 1200 | break;
|
---|
| 1201 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
|
---|
| 1202 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
|
---|
| 1203 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
|
---|
| 1204 | vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t));
|
---|
| 1205 | if (vb != NULL)
|
---|
| 1206 | {
|
---|
| 1207 | u32_t *vptr = (u32_t*)vb->value;
|
---|
| 1208 |
|
---|
| 1209 | derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr);
|
---|
| 1210 | snmp_varbind_tail_add(&m_stat->invb, vb);
|
---|
| 1211 | }
|
---|
| 1212 | else
|
---|
| 1213 | {
|
---|
| 1214 | derr = ERR_ARG;
|
---|
| 1215 | }
|
---|
| 1216 | break;
|
---|
| 1217 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
|
---|
| 1218 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
|
---|
| 1219 | LWIP_ASSERT("invalid length", len <= 0xff);
|
---|
| 1220 | vb = snmp_varbind_alloc(&oid, type, (u8_t)len);
|
---|
| 1221 | if (vb != NULL)
|
---|
| 1222 | {
|
---|
| 1223 | derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
|
---|
| 1224 | snmp_varbind_tail_add(&m_stat->invb, vb);
|
---|
| 1225 | }
|
---|
| 1226 | else
|
---|
| 1227 | {
|
---|
| 1228 | derr = ERR_ARG;
|
---|
| 1229 | }
|
---|
| 1230 | break;
|
---|
| 1231 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
|
---|
| 1232 | vb = snmp_varbind_alloc(&oid, type, 0);
|
---|
| 1233 | if (vb != NULL)
|
---|
| 1234 | {
|
---|
| 1235 | snmp_varbind_tail_add(&m_stat->invb, vb);
|
---|
| 1236 | derr = ERR_OK;
|
---|
| 1237 | }
|
---|
| 1238 | else
|
---|
| 1239 | {
|
---|
| 1240 | derr = ERR_ARG;
|
---|
| 1241 | }
|
---|
| 1242 | break;
|
---|
| 1243 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
|
---|
| 1244 | derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value);
|
---|
| 1245 | if (derr == ERR_OK)
|
---|
| 1246 | {
|
---|
| 1247 | vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t));
|
---|
| 1248 | if (vb != NULL)
|
---|
| 1249 | {
|
---|
| 1250 | u8_t i = oid_value.len;
|
---|
| 1251 | s32_t *vptr = (s32_t*)vb->value;
|
---|
| 1252 |
|
---|
| 1253 | while(i > 0)
|
---|
| 1254 | {
|
---|
| 1255 | i--;
|
---|
| 1256 | vptr[i] = oid_value.id[i];
|
---|
| 1257 | }
|
---|
| 1258 | snmp_varbind_tail_add(&m_stat->invb, vb);
|
---|
| 1259 | derr = ERR_OK;
|
---|
| 1260 | }
|
---|
| 1261 | else
|
---|
| 1262 | {
|
---|
| 1263 | derr = ERR_ARG;
|
---|
| 1264 | }
|
---|
| 1265 | }
|
---|
| 1266 | break;
|
---|
| 1267 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
|
---|
| 1268 | if (len == 4)
|
---|
| 1269 | {
|
---|
| 1270 | /* must be exactly 4 octets! */
|
---|
| 1271 | vb = snmp_varbind_alloc(&oid, type, 4);
|
---|
| 1272 | if (vb != NULL)
|
---|
| 1273 | {
|
---|
| 1274 | derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
|
---|
| 1275 | snmp_varbind_tail_add(&m_stat->invb, vb);
|
---|
| 1276 | }
|
---|
| 1277 | else
|
---|
| 1278 | {
|
---|
| 1279 | derr = ERR_ARG;
|
---|
| 1280 | }
|
---|
| 1281 | }
|
---|
| 1282 | else
|
---|
| 1283 | {
|
---|
| 1284 | derr = ERR_ARG;
|
---|
| 1285 | }
|
---|
| 1286 | break;
|
---|
| 1287 | default:
|
---|
| 1288 | derr = ERR_ARG;
|
---|
| 1289 | break;
|
---|
| 1290 | }
|
---|
| 1291 | if (derr != ERR_OK)
|
---|
| 1292 | {
|
---|
| 1293 | snmp_inc_snmpinasnparseerrs();
|
---|
| 1294 | /* free varbinds (if available) */
|
---|
| 1295 | snmp_varbind_list_free(&m_stat->invb);
|
---|
| 1296 | return ERR_ARG;
|
---|
| 1297 | }
|
---|
| 1298 | ofs += (1 + len_octets + len);
|
---|
| 1299 | vb_len -= (1 + len_octets + len);
|
---|
| 1300 | }
|
---|
| 1301 |
|
---|
| 1302 | if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ)
|
---|
| 1303 | {
|
---|
| 1304 | snmp_add_snmpintotalsetvars(m_stat->invb.count);
|
---|
| 1305 | }
|
---|
| 1306 | else
|
---|
| 1307 | {
|
---|
| 1308 | snmp_add_snmpintotalreqvars(m_stat->invb.count);
|
---|
| 1309 | }
|
---|
| 1310 |
|
---|
| 1311 | *ofs_ret = ofs;
|
---|
| 1312 | return ERR_OK;
|
---|
| 1313 | }
|
---|
| 1314 |
|
---|
| 1315 | struct snmp_varbind*
|
---|
| 1316 | snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
|
---|
| 1317 | {
|
---|
| 1318 | struct snmp_varbind *vb;
|
---|
| 1319 |
|
---|
| 1320 | vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
|
---|
| 1321 | if (vb != NULL)
|
---|
| 1322 | {
|
---|
| 1323 | u8_t i;
|
---|
| 1324 |
|
---|
| 1325 | vb->next = NULL;
|
---|
| 1326 | vb->prev = NULL;
|
---|
| 1327 | i = oid->len;
|
---|
| 1328 | vb->ident_len = i;
|
---|
| 1329 | if (i > 0)
|
---|
| 1330 | {
|
---|
| 1331 | LWIP_ASSERT("SNMP_MAX_TREE_DEPTH is configured too low", i <= SNMP_MAX_TREE_DEPTH);
|
---|
| 1332 | /* allocate array of s32_t for our object identifier */
|
---|
| 1333 | vb->ident = (s32_t*)memp_malloc(MEMP_SNMP_VALUE);
|
---|
| 1334 | if (vb->ident == NULL)
|
---|
| 1335 | {
|
---|
| 1336 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate ident value space\n"));
|
---|
| 1337 | memp_free(MEMP_SNMP_VARBIND, vb);
|
---|
| 1338 | return NULL;
|
---|
| 1339 | }
|
---|
| 1340 | while(i > 0)
|
---|
| 1341 | {
|
---|
| 1342 | i--;
|
---|
| 1343 | vb->ident[i] = oid->id[i];
|
---|
| 1344 | }
|
---|
| 1345 | }
|
---|
| 1346 | else
|
---|
| 1347 | {
|
---|
| 1348 | /* i == 0, pass zero length object identifier */
|
---|
| 1349 | vb->ident = NULL;
|
---|
| 1350 | }
|
---|
| 1351 | vb->value_type = type;
|
---|
| 1352 | vb->value_len = len;
|
---|
| 1353 | if (len > 0)
|
---|
| 1354 | {
|
---|
| 1355 | LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
|
---|
| 1356 | /* allocate raw bytes for our object value */
|
---|
| 1357 | vb->value = memp_malloc(MEMP_SNMP_VALUE);
|
---|
| 1358 | if (vb->value == NULL)
|
---|
| 1359 | {
|
---|
| 1360 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate value space\n"));
|
---|
| 1361 | if (vb->ident != NULL)
|
---|
| 1362 | {
|
---|
| 1363 | memp_free(MEMP_SNMP_VALUE, vb->ident);
|
---|
| 1364 | }
|
---|
| 1365 | memp_free(MEMP_SNMP_VARBIND, vb);
|
---|
| 1366 | return NULL;
|
---|
| 1367 | }
|
---|
| 1368 | }
|
---|
| 1369 | else
|
---|
| 1370 | {
|
---|
| 1371 | /* ASN1_NUL type, or zero length ASN1_OC_STR */
|
---|
| 1372 | vb->value = NULL;
|
---|
| 1373 | }
|
---|
| 1374 | }
|
---|
| 1375 | else
|
---|
| 1376 | {
|
---|
| 1377 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate varbind space\n"));
|
---|
| 1378 | }
|
---|
| 1379 | return vb;
|
---|
| 1380 | }
|
---|
| 1381 |
|
---|
| 1382 | void
|
---|
| 1383 | snmp_varbind_free(struct snmp_varbind *vb)
|
---|
| 1384 | {
|
---|
| 1385 | if (vb->value != NULL )
|
---|
| 1386 | {
|
---|
| 1387 | memp_free(MEMP_SNMP_VALUE, vb->value);
|
---|
| 1388 | }
|
---|
| 1389 | if (vb->ident != NULL )
|
---|
| 1390 | {
|
---|
| 1391 | memp_free(MEMP_SNMP_VALUE, vb->ident);
|
---|
| 1392 | }
|
---|
| 1393 | memp_free(MEMP_SNMP_VARBIND, vb);
|
---|
| 1394 | }
|
---|
| 1395 |
|
---|
| 1396 | void
|
---|
| 1397 | snmp_varbind_list_free(struct snmp_varbind_root *root)
|
---|
| 1398 | {
|
---|
| 1399 | struct snmp_varbind *vb, *prev;
|
---|
| 1400 |
|
---|
| 1401 | vb = root->tail;
|
---|
| 1402 | while ( vb != NULL )
|
---|
| 1403 | {
|
---|
| 1404 | prev = vb->prev;
|
---|
| 1405 | snmp_varbind_free(vb);
|
---|
| 1406 | vb = prev;
|
---|
| 1407 | }
|
---|
| 1408 | root->count = 0;
|
---|
| 1409 | root->head = NULL;
|
---|
| 1410 | root->tail = NULL;
|
---|
| 1411 | }
|
---|
| 1412 |
|
---|
| 1413 | void
|
---|
| 1414 | snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb)
|
---|
| 1415 | {
|
---|
| 1416 | if (root->count == 0)
|
---|
| 1417 | {
|
---|
| 1418 | /* add first varbind to list */
|
---|
| 1419 | root->head = vb;
|
---|
| 1420 | root->tail = vb;
|
---|
| 1421 | }
|
---|
| 1422 | else
|
---|
| 1423 | {
|
---|
| 1424 | /* add nth varbind to list tail */
|
---|
| 1425 | root->tail->next = vb;
|
---|
| 1426 | vb->prev = root->tail;
|
---|
| 1427 | root->tail = vb;
|
---|
| 1428 | }
|
---|
| 1429 | root->count += 1;
|
---|
| 1430 | }
|
---|
| 1431 |
|
---|
| 1432 | struct snmp_varbind*
|
---|
| 1433 | snmp_varbind_tail_remove(struct snmp_varbind_root *root)
|
---|
| 1434 | {
|
---|
| 1435 | struct snmp_varbind* vb;
|
---|
| 1436 |
|
---|
| 1437 | if (root->count > 0)
|
---|
| 1438 | {
|
---|
| 1439 | /* remove tail varbind */
|
---|
| 1440 | vb = root->tail;
|
---|
| 1441 | root->tail = vb->prev;
|
---|
| 1442 | vb->prev->next = NULL;
|
---|
| 1443 | root->count -= 1;
|
---|
| 1444 | }
|
---|
| 1445 | else
|
---|
| 1446 | {
|
---|
| 1447 | /* nothing to remove */
|
---|
| 1448 | vb = NULL;
|
---|
| 1449 | }
|
---|
| 1450 | return vb;
|
---|
| 1451 | }
|
---|
| 1452 |
|
---|
| 1453 | #endif /* LWIP_SNMP */
|
---|