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core/snmp/msg_in.c@29:da6f39d13880, 2015-01-08 (annotated)

Committer:
klauss
Date:
Thu Jan 08 23:42:30 2015 +0000
Revision:
29:da6f39d13880
Parent:
0:51ac1d130fd4 
wip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /**
mbed_official 0:51ac1d130fd4 2 * @file
mbed_official 0:51ac1d130fd4 3 * SNMP input message processing (RFC1157).
mbed_official 0:51ac1d130fd4 4 */
mbed_official 0:51ac1d130fd4 5
mbed_official 0:51ac1d130fd4 6 /*
mbed_official 0:51ac1d130fd4 7 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
mbed_official 0:51ac1d130fd4 8 * All rights reserved.
mbed_official 0:51ac1d130fd4 9 *
mbed_official 0:51ac1d130fd4 10 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 0:51ac1d130fd4 11 * are permitted provided that the following conditions are met:
mbed_official 0:51ac1d130fd4 12 *
mbed_official 0:51ac1d130fd4 13 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 0:51ac1d130fd4 14 * this list of conditions and the following disclaimer.
mbed_official 0:51ac1d130fd4 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 0:51ac1d130fd4 16 * this list of conditions and the following disclaimer in the documentation
mbed_official 0:51ac1d130fd4 17 * and/or other materials provided with the distribution.
mbed_official 0:51ac1d130fd4 18 * 3. The name of the author may not be used to endorse or promote products
mbed_official 0:51ac1d130fd4 19 * derived from this software without specific prior written permission.
mbed_official 0:51ac1d130fd4 20 *
mbed_official 0:51ac1d130fd4 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed_official 0:51ac1d130fd4 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed_official 0:51ac1d130fd4 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed_official 0:51ac1d130fd4 24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed_official 0:51ac1d130fd4 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed_official 0:51ac1d130fd4 26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official 0:51ac1d130fd4 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official 0:51ac1d130fd4 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed_official 0:51ac1d130fd4 29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed_official 0:51ac1d130fd4 30 * OF SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 31 *
mbed_official 0:51ac1d130fd4 32 * Author: Christiaan Simons <christiaan.simons@axon.tv>
mbed_official 0:51ac1d130fd4 33 */
mbed_official 0:51ac1d130fd4 34
mbed_official 0:51ac1d130fd4 35 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 36
mbed_official 0:51ac1d130fd4 37 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
mbed_official 0:51ac1d130fd4 38
mbed_official 0:51ac1d130fd4 39 #include "lwip/snmp.h"
mbed_official 0:51ac1d130fd4 40 #include "lwip/snmp_asn1.h"
mbed_official 0:51ac1d130fd4 41 #include "lwip/snmp_msg.h"
mbed_official 0:51ac1d130fd4 42 #include "lwip/snmp_structs.h"
mbed_official 0:51ac1d130fd4 43 #include "lwip/ip_addr.h"
mbed_official 0:51ac1d130fd4 44 #include "lwip/memp.h"
mbed_official 0:51ac1d130fd4 45 #include "lwip/udp.h"
mbed_official 0:51ac1d130fd4 46 #include "lwip/stats.h"
mbed_official 0:51ac1d130fd4 47
mbed_official 0:51ac1d130fd4 48 #include <string.h>
mbed_official 0:51ac1d130fd4 49
mbed_official 0:51ac1d130fd4 50 /* public (non-static) constants */
mbed_official 0:51ac1d130fd4 51 /** SNMP v1 == 0 */
mbed_official 0:51ac1d130fd4 52 const s32_t snmp_version = 0;
mbed_official 0:51ac1d130fd4 53 /** default SNMP community string */
mbed_official 0:51ac1d130fd4 54 const char snmp_publiccommunity[7] = "public";
mbed_official 0:51ac1d130fd4 55
mbed_official 0:51ac1d130fd4 56 /* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
mbed_official 0:51ac1d130fd4 57 struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
mbed_official 0:51ac1d130fd4 58 /* UDP Protocol Control Block */
mbed_official 0:51ac1d130fd4 59 struct udp_pcb *snmp1_pcb;
mbed_official 0:51ac1d130fd4 60
mbed_official 0:51ac1d130fd4 61 static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
mbed_official 0:51ac1d130fd4 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);
mbed_official 0:51ac1d130fd4 63 static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
mbed_official 0:51ac1d130fd4 64
mbed_official 0:51ac1d130fd4 65
mbed_official 0:51ac1d130fd4 66 /**
mbed_official 0:51ac1d130fd4 67 * Starts SNMP Agent.
mbed_official 0:51ac1d130fd4 68 * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
mbed_official 0:51ac1d130fd4 69 */
mbed_official 0:51ac1d130fd4 70 void
mbed_official 0:51ac1d130fd4 71 snmp_init(void)
mbed_official 0:51ac1d130fd4 72 {
mbed_official 0:51ac1d130fd4 73 struct snmp_msg_pstat *msg_ps;
mbed_official 0:51ac1d130fd4 74 u8_t i;
mbed_official 0:51ac1d130fd4 75
mbed_official 0:51ac1d130fd4 76 snmp1_pcb = udp_new();
mbed_official 0:51ac1d130fd4 77 if (snmp1_pcb != NULL)
mbed_official 0:51ac1d130fd4 78 {
mbed_official 0:51ac1d130fd4 79 udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
mbed_official 0:51ac1d130fd4 80 udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
mbed_official 0:51ac1d130fd4 81 }
mbed_official 0:51ac1d130fd4 82 msg_ps = &msg_input_list[0];
mbed_official 0:51ac1d130fd4 83 for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
mbed_official 0:51ac1d130fd4 84 {
mbed_official 0:51ac1d130fd4 85 msg_ps->state = SNMP_MSG_EMPTY;
mbed_official 0:51ac1d130fd4 86 msg_ps->error_index = 0;
mbed_official 0:51ac1d130fd4 87 msg_ps->error_status = SNMP_ES_NOERROR;
mbed_official 0:51ac1d130fd4 88 msg_ps++;
mbed_official 0:51ac1d130fd4 89 }
mbed_official 0:51ac1d130fd4 90 trap_msg.pcb = snmp1_pcb;
mbed_official 0:51ac1d130fd4 91
mbed_official 0:51ac1d130fd4 92 #ifdef SNMP_PRIVATE_MIB_INIT
mbed_official 0:51ac1d130fd4 93 /* If defined, rhis must be a function-like define to initialize the
mbed_official 0:51ac1d130fd4 94 * private MIB after the stack has been initialized.
mbed_official 0:51ac1d130fd4 95 * The private MIB can also be initialized in tcpip_callback (or after
mbed_official 0:51ac1d130fd4 96 * the stack is initialized), this define is only for convenience. */
mbed_official 0:51ac1d130fd4 97 SNMP_PRIVATE_MIB_INIT();
mbed_official 0:51ac1d130fd4 98 #endif /* SNMP_PRIVATE_MIB_INIT */
mbed_official 0:51ac1d130fd4 99
mbed_official 0:51ac1d130fd4 100 /* The coldstart trap will only be output
mbed_official 0:51ac1d130fd4 101 if our outgoing interface is up & configured */
mbed_official 0:51ac1d130fd4 102 snmp_coldstart_trap();
mbed_official 0:51ac1d130fd4 103 }
mbed_official 0:51ac1d130fd4 104
mbed_official 0:51ac1d130fd4 105 static void
mbed_official 0:51ac1d130fd4 106 snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
mbed_official 0:51ac1d130fd4 107 {
mbed_official 0:51ac1d130fd4 108 snmp_varbind_list_free(&msg_ps->outvb);
mbed_official 0:51ac1d130fd4 109 msg_ps->outvb = msg_ps->invb;
mbed_official 0:51ac1d130fd4 110 msg_ps->invb.head = NULL;
mbed_official 0:51ac1d130fd4 111 msg_ps->invb.tail = NULL;
mbed_official 0:51ac1d130fd4 112 msg_ps->invb.count = 0;
mbed_official 0:51ac1d130fd4 113 msg_ps->error_status = error;
mbed_official 0:51ac1d130fd4 114 msg_ps->error_index = 1 + msg_ps->vb_idx;
mbed_official 0:51ac1d130fd4 115 snmp_send_response(msg_ps);
mbed_official 0:51ac1d130fd4 116 snmp_varbind_list_free(&msg_ps->outvb);
mbed_official 0:51ac1d130fd4 117 msg_ps->state = SNMP_MSG_EMPTY;
mbed_official 0:51ac1d130fd4 118 }
mbed_official 0:51ac1d130fd4 119
mbed_official 0:51ac1d130fd4 120 static void
mbed_official 0:51ac1d130fd4 121 snmp_ok_response(struct snmp_msg_pstat *msg_ps)
mbed_official 0:51ac1d130fd4 122 {
mbed_official 0:51ac1d130fd4 123 err_t err_ret;
mbed_official 0:51ac1d130fd4 124
mbed_official 0:51ac1d130fd4 125 err_ret = snmp_send_response(msg_ps);
mbed_official 0:51ac1d130fd4 126 if (err_ret == ERR_MEM)
mbed_official 0:51ac1d130fd4 127 {
mbed_official 0:51ac1d130fd4 128 /* serious memory problem, can't return tooBig */
mbed_official 0:51ac1d130fd4 129 }
mbed_official 0:51ac1d130fd4 130 else
mbed_official 0:51ac1d130fd4 131 {
mbed_official 0:51ac1d130fd4 132 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
mbed_official 0:51ac1d130fd4 133 }
mbed_official 0:51ac1d130fd4 134 /* free varbinds (if available) */
mbed_official 0:51ac1d130fd4 135 snmp_varbind_list_free(&msg_ps->invb);
mbed_official 0:51ac1d130fd4 136 snmp_varbind_list_free(&msg_ps->outvb);
mbed_official 0:51ac1d130fd4 137 msg_ps->state = SNMP_MSG_EMPTY;
mbed_official 0:51ac1d130fd4 138 }
mbed_official 0:51ac1d130fd4 139
mbed_official 0:51ac1d130fd4 140 /**
mbed_official 0:51ac1d130fd4 141 * Service an internal or external event for SNMP GET.
mbed_official 0:51ac1d130fd4 142 *
mbed_official 0:51ac1d130fd4 143 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
mbed_official 0:51ac1d130fd4 144 * @param msg_ps points to the assosicated message process state
mbed_official 0:51ac1d130fd4 145 */
mbed_official 0:51ac1d130fd4 146 static void
mbed_official 0:51ac1d130fd4 147 snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
mbed_official 0:51ac1d130fd4 148 {
mbed_official 0:51ac1d130fd4 149 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
mbed_official 0:51ac1d130fd4 150
mbed_official 0:51ac1d130fd4 151 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
mbed_official 0:51ac1d130fd4 152 {
mbed_official 0:51ac1d130fd4 153 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 154 struct snmp_name_ptr np;
mbed_official 0:51ac1d130fd4 155
mbed_official 0:51ac1d130fd4 156 /* get_object_def() answer*/
mbed_official 0:51ac1d130fd4 157 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 158 np = msg_ps->ext_name_ptr;
mbed_official 0:51ac1d130fd4 159
mbed_official 0:51ac1d130fd4 160 /* translate answer into a known lifeform */
mbed_official 0:51ac1d130fd4 161 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 162 if ((msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) &&
mbed_official 0:51ac1d130fd4 163 (msg_ps->ext_object_def.access & MIB_ACCESS_READ))
mbed_official 0:51ac1d130fd4 164 {
mbed_official 0:51ac1d130fd4 165 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
mbed_official 0:51ac1d130fd4 166 en->get_value_q(request_id, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 167 }
mbed_official 0:51ac1d130fd4 168 else
mbed_official 0:51ac1d130fd4 169 {
mbed_official 0:51ac1d130fd4 170 en->get_object_def_pc(request_id, np.ident_len, np.ident);
mbed_official 0:51ac1d130fd4 171 /* search failed, object id points to unknown object (nosuchname) */
mbed_official 0:51ac1d130fd4 172 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 173 }
mbed_official 0:51ac1d130fd4 174 }
mbed_official 0:51ac1d130fd4 175 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
mbed_official 0:51ac1d130fd4 176 {
mbed_official 0:51ac1d130fd4 177 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 178 struct snmp_varbind *vb;
mbed_official 0:51ac1d130fd4 179
mbed_official 0:51ac1d130fd4 180 /* get_value() answer */
mbed_official 0:51ac1d130fd4 181 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 182
mbed_official 0:51ac1d130fd4 183 /* allocate output varbind */
mbed_official 0:51ac1d130fd4 184 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
mbed_official 0:51ac1d130fd4 185 LWIP_ASSERT("vb != NULL",vb != NULL);
mbed_official 0:51ac1d130fd4 186 if (vb != NULL)
mbed_official 0:51ac1d130fd4 187 {
mbed_official 0:51ac1d130fd4 188 vb->next = NULL;
mbed_official 0:51ac1d130fd4 189 vb->prev = NULL;
mbed_official 0:51ac1d130fd4 190
mbed_official 0:51ac1d130fd4 191 /* move name from invb to outvb */
mbed_official 0:51ac1d130fd4 192 vb->ident = msg_ps->vb_ptr->ident;
mbed_official 0:51ac1d130fd4 193 vb->ident_len = msg_ps->vb_ptr->ident_len;
mbed_official 0:51ac1d130fd4 194 /* ensure this memory is refereced once only */
mbed_official 0:51ac1d130fd4 195 msg_ps->vb_ptr->ident = NULL;
mbed_official 0:51ac1d130fd4 196 msg_ps->vb_ptr->ident_len = 0;
mbed_official 0:51ac1d130fd4 197
mbed_official 0:51ac1d130fd4 198 vb->value_type = msg_ps->ext_object_def.asn_type;
mbed_official 0:51ac1d130fd4 199 LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
mbed_official 0:51ac1d130fd4 200 vb->value_len = (u8_t)msg_ps->ext_object_def.v_len;
mbed_official 0:51ac1d130fd4 201 if (vb->value_len > 0)
mbed_official 0:51ac1d130fd4 202 {
mbed_official 0:51ac1d130fd4 203 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
mbed_official 0:51ac1d130fd4 204 vb->value = memp_malloc(MEMP_SNMP_VALUE);
mbed_official 0:51ac1d130fd4 205 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
mbed_official 0:51ac1d130fd4 206 if (vb->value != NULL)
mbed_official 0:51ac1d130fd4 207 {
mbed_official 0:51ac1d130fd4 208 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
mbed_official 0:51ac1d130fd4 209 snmp_varbind_tail_add(&msg_ps->outvb, vb);
mbed_official 0:51ac1d130fd4 210 /* search again (if vb_idx < msg_ps->invb.count) */
mbed_official 0:51ac1d130fd4 211 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 212 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 213 }
mbed_official 0:51ac1d130fd4 214 else
mbed_official 0:51ac1d130fd4 215 {
mbed_official 0:51ac1d130fd4 216 en->get_value_pc(request_id, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 217 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
mbed_official 0:51ac1d130fd4 218 msg_ps->vb_ptr->ident = vb->ident;
mbed_official 0:51ac1d130fd4 219 msg_ps->vb_ptr->ident_len = vb->ident_len;
mbed_official 0:51ac1d130fd4 220 memp_free(MEMP_SNMP_VARBIND, vb);
mbed_official 0:51ac1d130fd4 221 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
mbed_official 0:51ac1d130fd4 222 }
mbed_official 0:51ac1d130fd4 223 }
mbed_official 0:51ac1d130fd4 224 else
mbed_official 0:51ac1d130fd4 225 {
mbed_official 0:51ac1d130fd4 226 /* vb->value_len == 0, empty value (e.g. empty string) */
mbed_official 0:51ac1d130fd4 227 en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
mbed_official 0:51ac1d130fd4 228 vb->value = NULL;
mbed_official 0:51ac1d130fd4 229 snmp_varbind_tail_add(&msg_ps->outvb, vb);
mbed_official 0:51ac1d130fd4 230 /* search again (if vb_idx < msg_ps->invb.count) */
mbed_official 0:51ac1d130fd4 231 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 232 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 233 }
mbed_official 0:51ac1d130fd4 234 }
mbed_official 0:51ac1d130fd4 235 else
mbed_official 0:51ac1d130fd4 236 {
mbed_official 0:51ac1d130fd4 237 en->get_value_pc(request_id, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 238 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
mbed_official 0:51ac1d130fd4 239 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
mbed_official 0:51ac1d130fd4 240 }
mbed_official 0:51ac1d130fd4 241 }
mbed_official 0:51ac1d130fd4 242
mbed_official 0:51ac1d130fd4 243 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
mbed_official 0:51ac1d130fd4 244 (msg_ps->vb_idx < msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 245 {
mbed_official 0:51ac1d130fd4 246 struct mib_node *mn;
mbed_official 0:51ac1d130fd4 247 struct snmp_name_ptr np;
mbed_official 0:51ac1d130fd4 248
mbed_official 0:51ac1d130fd4 249 if (msg_ps->vb_idx == 0)
mbed_official 0:51ac1d130fd4 250 {
mbed_official 0:51ac1d130fd4 251 msg_ps->vb_ptr = msg_ps->invb.head;
mbed_official 0:51ac1d130fd4 252 }
mbed_official 0:51ac1d130fd4 253 else
mbed_official 0:51ac1d130fd4 254 {
mbed_official 0:51ac1d130fd4 255 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
mbed_official 0:51ac1d130fd4 256 }
mbed_official 0:51ac1d130fd4 257 /** test object identifier for .iso.org.dod.internet prefix */
mbed_official 0:51ac1d130fd4 258 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
mbed_official 0:51ac1d130fd4 259 {
mbed_official 0:51ac1d130fd4 260 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
mbed_official 0:51ac1d130fd4 261 msg_ps->vb_ptr->ident + 4, &np);
mbed_official 0:51ac1d130fd4 262 if (mn != NULL)
mbed_official 0:51ac1d130fd4 263 {
mbed_official 0:51ac1d130fd4 264 if (mn->node_type == MIB_NODE_EX)
mbed_official 0:51ac1d130fd4 265 {
mbed_official 0:51ac1d130fd4 266 /* external object */
mbed_official 0:51ac1d130fd4 267 struct mib_external_node *en = (struct mib_external_node*)mn;
mbed_official 0:51ac1d130fd4 268
mbed_official 0:51ac1d130fd4 269 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
mbed_official 0:51ac1d130fd4 270 /* save en && args in msg_ps!! */
mbed_official 0:51ac1d130fd4 271 msg_ps->ext_mib_node = en;
mbed_official 0:51ac1d130fd4 272 msg_ps->ext_name_ptr = np;
mbed_official 0:51ac1d130fd4 273
mbed_official 0:51ac1d130fd4 274 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
mbed_official 0:51ac1d130fd4 275 }
mbed_official 0:51ac1d130fd4 276 else
mbed_official 0:51ac1d130fd4 277 {
mbed_official 0:51ac1d130fd4 278 /* internal object */
mbed_official 0:51ac1d130fd4 279 struct obj_def object_def;
mbed_official 0:51ac1d130fd4 280
mbed_official 0:51ac1d130fd4 281 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
mbed_official 0:51ac1d130fd4 282 mn->get_object_def(np.ident_len, np.ident, &object_def);
mbed_official 0:51ac1d130fd4 283 if ((object_def.instance != MIB_OBJECT_NONE) &&
mbed_official 0:51ac1d130fd4 284 (object_def.access & MIB_ACCESS_READ))
mbed_official 0:51ac1d130fd4 285 {
mbed_official 0:51ac1d130fd4 286 mn = mn;
mbed_official 0:51ac1d130fd4 287 }
mbed_official 0:51ac1d130fd4 288 else
mbed_official 0:51ac1d130fd4 289 {
mbed_official 0:51ac1d130fd4 290 /* search failed, object id points to unknown object (nosuchname) */
mbed_official 0:51ac1d130fd4 291 mn = NULL;
mbed_official 0:51ac1d130fd4 292 }
mbed_official 0:51ac1d130fd4 293 if (mn != NULL)
mbed_official 0:51ac1d130fd4 294 {
mbed_official 0:51ac1d130fd4 295 struct snmp_varbind *vb;
mbed_official 0:51ac1d130fd4 296
mbed_official 0:51ac1d130fd4 297 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
mbed_official 0:51ac1d130fd4 298 /* allocate output varbind */
mbed_official 0:51ac1d130fd4 299 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
mbed_official 0:51ac1d130fd4 300 LWIP_ASSERT("vb != NULL",vb != NULL);
mbed_official 0:51ac1d130fd4 301 if (vb != NULL)
mbed_official 0:51ac1d130fd4 302 {
mbed_official 0:51ac1d130fd4 303 vb->next = NULL;
mbed_official 0:51ac1d130fd4 304 vb->prev = NULL;
mbed_official 0:51ac1d130fd4 305
mbed_official 0:51ac1d130fd4 306 /* move name from invb to outvb */
mbed_official 0:51ac1d130fd4 307 vb->ident = msg_ps->vb_ptr->ident;
mbed_official 0:51ac1d130fd4 308 vb->ident_len = msg_ps->vb_ptr->ident_len;
mbed_official 0:51ac1d130fd4 309 /* ensure this memory is refereced once only */
mbed_official 0:51ac1d130fd4 310 msg_ps->vb_ptr->ident = NULL;
mbed_official 0:51ac1d130fd4 311 msg_ps->vb_ptr->ident_len = 0;
mbed_official 0:51ac1d130fd4 312
mbed_official 0:51ac1d130fd4 313 vb->value_type = object_def.asn_type;
mbed_official 0:51ac1d130fd4 314 LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
mbed_official 0:51ac1d130fd4 315 vb->value_len = (u8_t)object_def.v_len;
mbed_official 0:51ac1d130fd4 316 if (vb->value_len > 0)
mbed_official 0:51ac1d130fd4 317 {
mbed_official 0:51ac1d130fd4 318 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low",
mbed_official 0:51ac1d130fd4 319 vb->value_len <= SNMP_MAX_VALUE_SIZE);
mbed_official 0:51ac1d130fd4 320 vb->value = memp_malloc(MEMP_SNMP_VALUE);
mbed_official 0:51ac1d130fd4 321 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
mbed_official 0:51ac1d130fd4 322 if (vb->value != NULL)
mbed_official 0:51ac1d130fd4 323 {
mbed_official 0:51ac1d130fd4 324 mn->get_value(&object_def, vb->value_len, vb->value);
mbed_official 0:51ac1d130fd4 325 snmp_varbind_tail_add(&msg_ps->outvb, vb);
mbed_official 0:51ac1d130fd4 326 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 327 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 328 }
mbed_official 0:51ac1d130fd4 329 else
mbed_official 0:51ac1d130fd4 330 {
mbed_official 0:51ac1d130fd4 331 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
mbed_official 0:51ac1d130fd4 332 msg_ps->vb_ptr->ident = vb->ident;
mbed_official 0:51ac1d130fd4 333 msg_ps->vb_ptr->ident_len = vb->ident_len;
mbed_official 0:51ac1d130fd4 334 memp_free(MEMP_SNMP_VARBIND, vb);
mbed_official 0:51ac1d130fd4 335 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
mbed_official 0:51ac1d130fd4 336 }
mbed_official 0:51ac1d130fd4 337 }
mbed_official 0:51ac1d130fd4 338 else
mbed_official 0:51ac1d130fd4 339 {
mbed_official 0:51ac1d130fd4 340 /* vb->value_len == 0, empty value (e.g. empty string) */
mbed_official 0:51ac1d130fd4 341 vb->value = NULL;
mbed_official 0:51ac1d130fd4 342 snmp_varbind_tail_add(&msg_ps->outvb, vb);
mbed_official 0:51ac1d130fd4 343 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 344 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 345 }
mbed_official 0:51ac1d130fd4 346 }
mbed_official 0:51ac1d130fd4 347 else
mbed_official 0:51ac1d130fd4 348 {
mbed_official 0:51ac1d130fd4 349 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n"));
mbed_official 0:51ac1d130fd4 350 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
mbed_official 0:51ac1d130fd4 351 }
mbed_official 0:51ac1d130fd4 352 }
mbed_official 0:51ac1d130fd4 353 }
mbed_official 0:51ac1d130fd4 354 }
mbed_official 0:51ac1d130fd4 355 }
mbed_official 0:51ac1d130fd4 356 else
mbed_official 0:51ac1d130fd4 357 {
mbed_official 0:51ac1d130fd4 358 mn = NULL;
mbed_official 0:51ac1d130fd4 359 }
mbed_official 0:51ac1d130fd4 360 if (mn == NULL)
mbed_official 0:51ac1d130fd4 361 {
mbed_official 0:51ac1d130fd4 362 /* mn == NULL, noSuchName */
mbed_official 0:51ac1d130fd4 363 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 364 }
mbed_official 0:51ac1d130fd4 365 }
mbed_official 0:51ac1d130fd4 366 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
mbed_official 0:51ac1d130fd4 367 (msg_ps->vb_idx == msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 368 {
mbed_official 0:51ac1d130fd4 369 snmp_ok_response(msg_ps);
mbed_official 0:51ac1d130fd4 370 }
mbed_official 0:51ac1d130fd4 371 }
mbed_official 0:51ac1d130fd4 372
mbed_official 0:51ac1d130fd4 373 /**
mbed_official 0:51ac1d130fd4 374 * Service an internal or external event for SNMP GETNEXT.
mbed_official 0:51ac1d130fd4 375 *
mbed_official 0:51ac1d130fd4 376 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
mbed_official 0:51ac1d130fd4 377 * @param msg_ps points to the assosicated message process state
mbed_official 0:51ac1d130fd4 378 */
mbed_official 0:51ac1d130fd4 379 static void
mbed_official 0:51ac1d130fd4 380 snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
mbed_official 0:51ac1d130fd4 381 {
mbed_official 0:51ac1d130fd4 382 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
mbed_official 0:51ac1d130fd4 383
mbed_official 0:51ac1d130fd4 384 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
mbed_official 0:51ac1d130fd4 385 {
mbed_official 0:51ac1d130fd4 386 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 387
mbed_official 0:51ac1d130fd4 388 /* get_object_def() answer*/
mbed_official 0:51ac1d130fd4 389 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 390
mbed_official 0:51ac1d130fd4 391 /* translate answer into a known lifeform */
mbed_official 0:51ac1d130fd4 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);
mbed_official 0:51ac1d130fd4 393 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
mbed_official 0:51ac1d130fd4 394 {
mbed_official 0:51ac1d130fd4 395 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
mbed_official 0:51ac1d130fd4 396 en->get_value_q(request_id, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 397 }
mbed_official 0:51ac1d130fd4 398 else
mbed_official 0:51ac1d130fd4 399 {
mbed_official 0:51ac1d130fd4 400 en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
mbed_official 0:51ac1d130fd4 401 /* search failed, object id points to unknown object (nosuchname) */
mbed_official 0:51ac1d130fd4 402 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 403 }
mbed_official 0:51ac1d130fd4 404 }
mbed_official 0:51ac1d130fd4 405 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
mbed_official 0:51ac1d130fd4 406 {
mbed_official 0:51ac1d130fd4 407 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 408 struct snmp_varbind *vb;
mbed_official 0:51ac1d130fd4 409
mbed_official 0:51ac1d130fd4 410 /* get_value() answer */
mbed_official 0:51ac1d130fd4 411 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 412
mbed_official 0:51ac1d130fd4 413 LWIP_ASSERT("invalid length", msg_ps->ext_object_def.v_len <= 0xff);
mbed_official 0:51ac1d130fd4 414 vb = snmp_varbind_alloc(&msg_ps->ext_oid,
mbed_official 0:51ac1d130fd4 415 msg_ps->ext_object_def.asn_type,
mbed_official 0:51ac1d130fd4 416 (u8_t)msg_ps->ext_object_def.v_len);
mbed_official 0:51ac1d130fd4 417 if (vb != NULL)
mbed_official 0:51ac1d130fd4 418 {
mbed_official 0:51ac1d130fd4 419 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
mbed_official 0:51ac1d130fd4 420 snmp_varbind_tail_add(&msg_ps->outvb, vb);
mbed_official 0:51ac1d130fd4 421 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 422 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 423 }
mbed_official 0:51ac1d130fd4 424 else
mbed_official 0:51ac1d130fd4 425 {
mbed_official 0:51ac1d130fd4 426 en->get_value_pc(request_id, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 427 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
mbed_official 0:51ac1d130fd4 428 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
mbed_official 0:51ac1d130fd4 429 }
mbed_official 0:51ac1d130fd4 430 }
mbed_official 0:51ac1d130fd4 431
mbed_official 0:51ac1d130fd4 432 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
mbed_official 0:51ac1d130fd4 433 (msg_ps->vb_idx < msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 434 {
mbed_official 0:51ac1d130fd4 435 struct mib_node *mn;
mbed_official 0:51ac1d130fd4 436 struct snmp_obj_id oid;
mbed_official 0:51ac1d130fd4 437
mbed_official 0:51ac1d130fd4 438 if (msg_ps->vb_idx == 0)
mbed_official 0:51ac1d130fd4 439 {
mbed_official 0:51ac1d130fd4 440 msg_ps->vb_ptr = msg_ps->invb.head;
mbed_official 0:51ac1d130fd4 441 }
mbed_official 0:51ac1d130fd4 442 else
mbed_official 0:51ac1d130fd4 443 {
mbed_official 0:51ac1d130fd4 444 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
mbed_official 0:51ac1d130fd4 445 }
mbed_official 0:51ac1d130fd4 446 if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
mbed_official 0:51ac1d130fd4 447 {
mbed_official 0:51ac1d130fd4 448 if (msg_ps->vb_ptr->ident_len > 3)
mbed_official 0:51ac1d130fd4 449 {
mbed_official 0:51ac1d130fd4 450 /* can offset ident_len and ident */
mbed_official 0:51ac1d130fd4 451 mn = snmp_expand_tree((struct mib_node*)&internet,
mbed_official 0:51ac1d130fd4 452 msg_ps->vb_ptr->ident_len - 4,
mbed_official 0:51ac1d130fd4 453 msg_ps->vb_ptr->ident + 4, &oid);
mbed_official 0:51ac1d130fd4 454 }
mbed_official 0:51ac1d130fd4 455 else
mbed_official 0:51ac1d130fd4 456 {
mbed_official 0:51ac1d130fd4 457 /* can't offset ident_len -4, ident + 4 */
mbed_official 0:51ac1d130fd4 458 mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid);
mbed_official 0:51ac1d130fd4 459 }
mbed_official 0:51ac1d130fd4 460 }
mbed_official 0:51ac1d130fd4 461 else
mbed_official 0:51ac1d130fd4 462 {
mbed_official 0:51ac1d130fd4 463 mn = NULL;
mbed_official 0:51ac1d130fd4 464 }
mbed_official 0:51ac1d130fd4 465 if (mn != NULL)
mbed_official 0:51ac1d130fd4 466 {
mbed_official 0:51ac1d130fd4 467 if (mn->node_type == MIB_NODE_EX)
mbed_official 0:51ac1d130fd4 468 {
mbed_official 0:51ac1d130fd4 469 /* external object */
mbed_official 0:51ac1d130fd4 470 struct mib_external_node *en = (struct mib_external_node*)mn;
mbed_official 0:51ac1d130fd4 471
mbed_official 0:51ac1d130fd4 472 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
mbed_official 0:51ac1d130fd4 473 /* save en && args in msg_ps!! */
mbed_official 0:51ac1d130fd4 474 msg_ps->ext_mib_node = en;
mbed_official 0:51ac1d130fd4 475 msg_ps->ext_oid = oid;
mbed_official 0:51ac1d130fd4 476
mbed_official 0:51ac1d130fd4 477 en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]);
mbed_official 0:51ac1d130fd4 478 }
mbed_official 0:51ac1d130fd4 479 else
mbed_official 0:51ac1d130fd4 480 {
mbed_official 0:51ac1d130fd4 481 /* internal object */
mbed_official 0:51ac1d130fd4 482 struct obj_def object_def;
mbed_official 0:51ac1d130fd4 483 struct snmp_varbind *vb;
mbed_official 0:51ac1d130fd4 484
mbed_official 0:51ac1d130fd4 485 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
mbed_official 0:51ac1d130fd4 486 mn->get_object_def(1, &oid.id[oid.len - 1], &object_def);
mbed_official 0:51ac1d130fd4 487
mbed_official 0:51ac1d130fd4 488 LWIP_ASSERT("invalid length", object_def.v_len <= 0xff);
mbed_official 0:51ac1d130fd4 489 vb = snmp_varbind_alloc(&oid, object_def.asn_type, (u8_t)object_def.v_len);
mbed_official 0:51ac1d130fd4 490 if (vb != NULL)
mbed_official 0:51ac1d130fd4 491 {
mbed_official 0:51ac1d130fd4 492 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
mbed_official 0:51ac1d130fd4 493 mn->get_value(&object_def, object_def.v_len, vb->value);
mbed_official 0:51ac1d130fd4 494 snmp_varbind_tail_add(&msg_ps->outvb, vb);
mbed_official 0:51ac1d130fd4 495 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 496 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 497 }
mbed_official 0:51ac1d130fd4 498 else
mbed_official 0:51ac1d130fd4 499 {
mbed_official 0:51ac1d130fd4 500 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n"));
mbed_official 0:51ac1d130fd4 501 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
mbed_official 0:51ac1d130fd4 502 }
mbed_official 0:51ac1d130fd4 503 }
mbed_official 0:51ac1d130fd4 504 }
mbed_official 0:51ac1d130fd4 505 if (mn == NULL)
mbed_official 0:51ac1d130fd4 506 {
mbed_official 0:51ac1d130fd4 507 /* mn == NULL, noSuchName */
mbed_official 0:51ac1d130fd4 508 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 509 }
mbed_official 0:51ac1d130fd4 510 }
mbed_official 0:51ac1d130fd4 511 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
mbed_official 0:51ac1d130fd4 512 (msg_ps->vb_idx == msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 513 {
mbed_official 0:51ac1d130fd4 514 snmp_ok_response(msg_ps);
mbed_official 0:51ac1d130fd4 515 }
mbed_official 0:51ac1d130fd4 516 }
mbed_official 0:51ac1d130fd4 517
mbed_official 0:51ac1d130fd4 518 /**
mbed_official 0:51ac1d130fd4 519 * Service an internal or external event for SNMP SET.
mbed_official 0:51ac1d130fd4 520 *
mbed_official 0:51ac1d130fd4 521 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
mbed_official 0:51ac1d130fd4 522 * @param msg_ps points to the assosicated message process state
mbed_official 0:51ac1d130fd4 523 */
mbed_official 0:51ac1d130fd4 524 static void
mbed_official 0:51ac1d130fd4 525 snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
mbed_official 0:51ac1d130fd4 526 {
mbed_official 0:51ac1d130fd4 527 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
mbed_official 0:51ac1d130fd4 528
mbed_official 0:51ac1d130fd4 529 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
mbed_official 0:51ac1d130fd4 530 {
mbed_official 0:51ac1d130fd4 531 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 532 struct snmp_name_ptr np;
mbed_official 0:51ac1d130fd4 533
mbed_official 0:51ac1d130fd4 534 /* get_object_def() answer*/
mbed_official 0:51ac1d130fd4 535 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 536 np = msg_ps->ext_name_ptr;
mbed_official 0:51ac1d130fd4 537
mbed_official 0:51ac1d130fd4 538 /* translate answer into a known lifeform */
mbed_official 0:51ac1d130fd4 539 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 540 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
mbed_official 0:51ac1d130fd4 541 {
mbed_official 0:51ac1d130fd4 542 msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST;
mbed_official 0:51ac1d130fd4 543 en->set_test_q(request_id, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 544 }
mbed_official 0:51ac1d130fd4 545 else
mbed_official 0:51ac1d130fd4 546 {
mbed_official 0:51ac1d130fd4 547 en->get_object_def_pc(request_id, np.ident_len, np.ident);
mbed_official 0:51ac1d130fd4 548 /* search failed, object id points to unknown object (nosuchname) */
mbed_official 0:51ac1d130fd4 549 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 550 }
mbed_official 0:51ac1d130fd4 551 }
mbed_official 0:51ac1d130fd4 552 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST)
mbed_official 0:51ac1d130fd4 553 {
mbed_official 0:51ac1d130fd4 554 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 555
mbed_official 0:51ac1d130fd4 556 /* set_test() answer*/
mbed_official 0:51ac1d130fd4 557 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 558
mbed_official 0:51ac1d130fd4 559 if (msg_ps->ext_object_def.access & MIB_ACCESS_WRITE)
mbed_official 0:51ac1d130fd4 560 {
mbed_official 0:51ac1d130fd4 561 if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) &&
mbed_official 0:51ac1d130fd4 562 (en->set_test_a(request_id,&msg_ps->ext_object_def,
mbed_official 0:51ac1d130fd4 563 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
mbed_official 0:51ac1d130fd4 564 {
mbed_official 0:51ac1d130fd4 565 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 566 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 567 }
mbed_official 0:51ac1d130fd4 568 else
mbed_official 0:51ac1d130fd4 569 {
mbed_official 0:51ac1d130fd4 570 en->set_test_pc(request_id,&msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 571 /* bad value */
mbed_official 0:51ac1d130fd4 572 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
mbed_official 0:51ac1d130fd4 573 }
mbed_official 0:51ac1d130fd4 574 }
mbed_official 0:51ac1d130fd4 575 else
mbed_official 0:51ac1d130fd4 576 {
mbed_official 0:51ac1d130fd4 577 en->set_test_pc(request_id,&msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 578 /* object not available for set */
mbed_official 0:51ac1d130fd4 579 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 580 }
mbed_official 0:51ac1d130fd4 581 }
mbed_official 0:51ac1d130fd4 582 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S)
mbed_official 0:51ac1d130fd4 583 {
mbed_official 0:51ac1d130fd4 584 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 585 struct snmp_name_ptr np;
mbed_official 0:51ac1d130fd4 586
mbed_official 0:51ac1d130fd4 587 /* get_object_def() answer*/
mbed_official 0:51ac1d130fd4 588 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 589 np = msg_ps->ext_name_ptr;
mbed_official 0:51ac1d130fd4 590
mbed_official 0:51ac1d130fd4 591 /* translate answer into a known lifeform */
mbed_official 0:51ac1d130fd4 592 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
mbed_official 0:51ac1d130fd4 593 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
mbed_official 0:51ac1d130fd4 594 {
mbed_official 0:51ac1d130fd4 595 msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE;
mbed_official 0:51ac1d130fd4 596 en->set_value_q(request_id, &msg_ps->ext_object_def,
mbed_official 0:51ac1d130fd4 597 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
mbed_official 0:51ac1d130fd4 598 }
mbed_official 0:51ac1d130fd4 599 else
mbed_official 0:51ac1d130fd4 600 {
mbed_official 0:51ac1d130fd4 601 en->get_object_def_pc(request_id, np.ident_len, np.ident);
mbed_official 0:51ac1d130fd4 602 /* set_value failed, object has disappeared for some odd reason?? */
mbed_official 0:51ac1d130fd4 603 snmp_error_response(msg_ps,SNMP_ES_GENERROR);
mbed_official 0:51ac1d130fd4 604 }
mbed_official 0:51ac1d130fd4 605 }
mbed_official 0:51ac1d130fd4 606 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE)
mbed_official 0:51ac1d130fd4 607 {
mbed_official 0:51ac1d130fd4 608 struct mib_external_node *en;
mbed_official 0:51ac1d130fd4 609
mbed_official 0:51ac1d130fd4 610 /** set_value_a() */
mbed_official 0:51ac1d130fd4 611 en = msg_ps->ext_mib_node;
mbed_official 0:51ac1d130fd4 612 en->set_value_a(request_id, &msg_ps->ext_object_def,
mbed_official 0:51ac1d130fd4 613 msg_ps->vb_ptr->value_len, msg_ps->vb_ptr->value);
mbed_official 0:51ac1d130fd4 614
mbed_official 0:51ac1d130fd4 615 /** @todo use set_value_pc() if toobig */
mbed_official 0:51ac1d130fd4 616 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
mbed_official 0:51ac1d130fd4 617 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 618 }
mbed_official 0:51ac1d130fd4 619
mbed_official 0:51ac1d130fd4 620 /* test all values before setting */
mbed_official 0:51ac1d130fd4 621 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
mbed_official 0:51ac1d130fd4 622 (msg_ps->vb_idx < msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 623 {
mbed_official 0:51ac1d130fd4 624 struct mib_node *mn;
mbed_official 0:51ac1d130fd4 625 struct snmp_name_ptr np;
mbed_official 0:51ac1d130fd4 626
mbed_official 0:51ac1d130fd4 627 if (msg_ps->vb_idx == 0)
mbed_official 0:51ac1d130fd4 628 {
mbed_official 0:51ac1d130fd4 629 msg_ps->vb_ptr = msg_ps->invb.head;
mbed_official 0:51ac1d130fd4 630 }
mbed_official 0:51ac1d130fd4 631 else
mbed_official 0:51ac1d130fd4 632 {
mbed_official 0:51ac1d130fd4 633 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
mbed_official 0:51ac1d130fd4 634 }
mbed_official 0:51ac1d130fd4 635 /** test object identifier for .iso.org.dod.internet prefix */
mbed_official 0:51ac1d130fd4 636 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
mbed_official 0:51ac1d130fd4 637 {
mbed_official 0:51ac1d130fd4 638 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
mbed_official 0:51ac1d130fd4 639 msg_ps->vb_ptr->ident + 4, &np);
mbed_official 0:51ac1d130fd4 640 if (mn != NULL)
mbed_official 0:51ac1d130fd4 641 {
mbed_official 0:51ac1d130fd4 642 if (mn->node_type == MIB_NODE_EX)
mbed_official 0:51ac1d130fd4 643 {
mbed_official 0:51ac1d130fd4 644 /* external object */
mbed_official 0:51ac1d130fd4 645 struct mib_external_node *en = (struct mib_external_node*)mn;
mbed_official 0:51ac1d130fd4 646
mbed_official 0:51ac1d130fd4 647 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
mbed_official 0:51ac1d130fd4 648 /* save en && args in msg_ps!! */
mbed_official 0:51ac1d130fd4 649 msg_ps->ext_mib_node = en;
mbed_official 0:51ac1d130fd4 650 msg_ps->ext_name_ptr = np;
mbed_official 0:51ac1d130fd4 651
mbed_official 0:51ac1d130fd4 652 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
mbed_official 0:51ac1d130fd4 653 }
mbed_official 0:51ac1d130fd4 654 else
mbed_official 0:51ac1d130fd4 655 {
mbed_official 0:51ac1d130fd4 656 /* internal object */
mbed_official 0:51ac1d130fd4 657 struct obj_def object_def;
mbed_official 0:51ac1d130fd4 658
mbed_official 0:51ac1d130fd4 659 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
mbed_official 0:51ac1d130fd4 660 mn->get_object_def(np.ident_len, np.ident, &object_def);
mbed_official 0:51ac1d130fd4 661 if (object_def.instance != MIB_OBJECT_NONE)
mbed_official 0:51ac1d130fd4 662 {
mbed_official 0:51ac1d130fd4 663 mn = mn;
mbed_official 0:51ac1d130fd4 664 }
mbed_official 0:51ac1d130fd4 665 else
mbed_official 0:51ac1d130fd4 666 {
mbed_official 0:51ac1d130fd4 667 /* search failed, object id points to unknown object (nosuchname) */
mbed_official 0:51ac1d130fd4 668 mn = NULL;
mbed_official 0:51ac1d130fd4 669 }
mbed_official 0:51ac1d130fd4 670 if (mn != NULL)
mbed_official 0:51ac1d130fd4 671 {
mbed_official 0:51ac1d130fd4 672 msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST;
mbed_official 0:51ac1d130fd4 673
mbed_official 0:51ac1d130fd4 674 if (object_def.access & MIB_ACCESS_WRITE)
mbed_official 0:51ac1d130fd4 675 {
mbed_official 0:51ac1d130fd4 676 if ((object_def.asn_type == msg_ps->vb_ptr->value_type) &&
mbed_official 0:51ac1d130fd4 677 (mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
mbed_official 0:51ac1d130fd4 678 {
mbed_official 0:51ac1d130fd4 679 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 680 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 681 }
mbed_official 0:51ac1d130fd4 682 else
mbed_official 0:51ac1d130fd4 683 {
mbed_official 0:51ac1d130fd4 684 /* bad value */
mbed_official 0:51ac1d130fd4 685 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
mbed_official 0:51ac1d130fd4 686 }
mbed_official 0:51ac1d130fd4 687 }
mbed_official 0:51ac1d130fd4 688 else
mbed_official 0:51ac1d130fd4 689 {
mbed_official 0:51ac1d130fd4 690 /* object not available for set */
mbed_official 0:51ac1d130fd4 691 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 692 }
mbed_official 0:51ac1d130fd4 693 }
mbed_official 0:51ac1d130fd4 694 }
mbed_official 0:51ac1d130fd4 695 }
mbed_official 0:51ac1d130fd4 696 }
mbed_official 0:51ac1d130fd4 697 else
mbed_official 0:51ac1d130fd4 698 {
mbed_official 0:51ac1d130fd4 699 mn = NULL;
mbed_official 0:51ac1d130fd4 700 }
mbed_official 0:51ac1d130fd4 701 if (mn == NULL)
mbed_official 0:51ac1d130fd4 702 {
mbed_official 0:51ac1d130fd4 703 /* mn == NULL, noSuchName */
mbed_official 0:51ac1d130fd4 704 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
mbed_official 0:51ac1d130fd4 705 }
mbed_official 0:51ac1d130fd4 706 }
mbed_official 0:51ac1d130fd4 707
mbed_official 0:51ac1d130fd4 708 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
mbed_official 0:51ac1d130fd4 709 (msg_ps->vb_idx == msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 710 {
mbed_official 0:51ac1d130fd4 711 msg_ps->vb_idx = 0;
mbed_official 0:51ac1d130fd4 712 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
mbed_official 0:51ac1d130fd4 713 }
mbed_official 0:51ac1d130fd4 714
mbed_official 0:51ac1d130fd4 715 /* set all values "atomically" (be as "atomic" as possible) */
mbed_official 0:51ac1d130fd4 716 while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
mbed_official 0:51ac1d130fd4 717 (msg_ps->vb_idx < msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 718 {
mbed_official 0:51ac1d130fd4 719 struct mib_node *mn;
mbed_official 0:51ac1d130fd4 720 struct snmp_name_ptr np;
mbed_official 0:51ac1d130fd4 721
mbed_official 0:51ac1d130fd4 722 if (msg_ps->vb_idx == 0)
mbed_official 0:51ac1d130fd4 723 {
mbed_official 0:51ac1d130fd4 724 msg_ps->vb_ptr = msg_ps->invb.head;
mbed_official 0:51ac1d130fd4 725 }
mbed_official 0:51ac1d130fd4 726 else
mbed_official 0:51ac1d130fd4 727 {
mbed_official 0:51ac1d130fd4 728 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
mbed_official 0:51ac1d130fd4 729 }
mbed_official 0:51ac1d130fd4 730 /* skip iso prefix test, was done previously while settesting() */
mbed_official 0:51ac1d130fd4 731 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
mbed_official 0:51ac1d130fd4 732 msg_ps->vb_ptr->ident + 4, &np);
mbed_official 0:51ac1d130fd4 733 /* check if object is still available
mbed_official 0:51ac1d130fd4 734 (e.g. external hot-plug thingy present?) */
mbed_official 0:51ac1d130fd4 735 if (mn != NULL)
mbed_official 0:51ac1d130fd4 736 {
mbed_official 0:51ac1d130fd4 737 if (mn->node_type == MIB_NODE_EX)
mbed_official 0:51ac1d130fd4 738 {
mbed_official 0:51ac1d130fd4 739 /* external object */
mbed_official 0:51ac1d130fd4 740 struct mib_external_node *en = (struct mib_external_node*)mn;
mbed_official 0:51ac1d130fd4 741
mbed_official 0:51ac1d130fd4 742 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S;
mbed_official 0:51ac1d130fd4 743 /* save en && args in msg_ps!! */
mbed_official 0:51ac1d130fd4 744 msg_ps->ext_mib_node = en;
mbed_official 0:51ac1d130fd4 745 msg_ps->ext_name_ptr = np;
mbed_official 0:51ac1d130fd4 746
mbed_official 0:51ac1d130fd4 747 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
mbed_official 0:51ac1d130fd4 748 }
mbed_official 0:51ac1d130fd4 749 else
mbed_official 0:51ac1d130fd4 750 {
mbed_official 0:51ac1d130fd4 751 /* internal object */
mbed_official 0:51ac1d130fd4 752 struct obj_def object_def;
mbed_official 0:51ac1d130fd4 753
mbed_official 0:51ac1d130fd4 754 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S;
mbed_official 0:51ac1d130fd4 755 mn->get_object_def(np.ident_len, np.ident, &object_def);
mbed_official 0:51ac1d130fd4 756 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
mbed_official 0:51ac1d130fd4 757 mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
mbed_official 0:51ac1d130fd4 758 msg_ps->vb_idx += 1;
mbed_official 0:51ac1d130fd4 759 }
mbed_official 0:51ac1d130fd4 760 }
mbed_official 0:51ac1d130fd4 761 }
mbed_official 0:51ac1d130fd4 762 if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
mbed_official 0:51ac1d130fd4 763 (msg_ps->vb_idx == msg_ps->invb.count))
mbed_official 0:51ac1d130fd4 764 {
mbed_official 0:51ac1d130fd4 765 /* simply echo the input if we can set it
mbed_official 0:51ac1d130fd4 766 @todo do we need to return the actual value?
mbed_official 0:51ac1d130fd4 767 e.g. if value is silently modified or behaves sticky? */
mbed_official 0:51ac1d130fd4 768 msg_ps->outvb = msg_ps->invb;
mbed_official 0:51ac1d130fd4 769 msg_ps->invb.head = NULL;
mbed_official 0:51ac1d130fd4 770 msg_ps->invb.tail = NULL;
mbed_official 0:51ac1d130fd4 771 msg_ps->invb.count = 0;
mbed_official 0:51ac1d130fd4 772 snmp_ok_response(msg_ps);
mbed_official 0:51ac1d130fd4 773 }
mbed_official 0:51ac1d130fd4 774 }
mbed_official 0:51ac1d130fd4 775
mbed_official 0:51ac1d130fd4 776
mbed_official 0:51ac1d130fd4 777 /**
mbed_official 0:51ac1d130fd4 778 * Handle one internal or external event.
mbed_official 0:51ac1d130fd4 779 * Called for one async event. (recv external/private answer)
mbed_official 0:51ac1d130fd4 780 *
mbed_official 0:51ac1d130fd4 781 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
mbed_official 0:51ac1d130fd4 782 */
mbed_official 0:51ac1d130fd4 783 void
mbed_official 0:51ac1d130fd4 784 snmp_msg_event(u8_t request_id)
mbed_official 0:51ac1d130fd4 785 {
mbed_official 0:51ac1d130fd4 786 struct snmp_msg_pstat *msg_ps;
mbed_official 0:51ac1d130fd4 787
mbed_official 0:51ac1d130fd4 788 if (request_id < SNMP_CONCURRENT_REQUESTS)
mbed_official 0:51ac1d130fd4 789 {
mbed_official 0:51ac1d130fd4 790 msg_ps = &msg_input_list[request_id];
mbed_official 0:51ac1d130fd4 791 if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ)
mbed_official 0:51ac1d130fd4 792 {
mbed_official 0:51ac1d130fd4 793 snmp_msg_getnext_event(request_id, msg_ps);
mbed_official 0:51ac1d130fd4 794 }
mbed_official 0:51ac1d130fd4 795 else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ)
mbed_official 0:51ac1d130fd4 796 {
mbed_official 0:51ac1d130fd4 797 snmp_msg_get_event(request_id, msg_ps);
mbed_official 0:51ac1d130fd4 798 }
mbed_official 0:51ac1d130fd4 799 else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)
mbed_official 0:51ac1d130fd4 800 {
mbed_official 0:51ac1d130fd4 801 snmp_msg_set_event(request_id, msg_ps);
mbed_official 0:51ac1d130fd4 802 }
mbed_official 0:51ac1d130fd4 803 }
mbed_official 0:51ac1d130fd4 804 }
mbed_official 0:51ac1d130fd4 805
mbed_official 0:51ac1d130fd4 806
mbed_official 0:51ac1d130fd4 807 /* lwIP UDP receive callback function */
mbed_official 0:51ac1d130fd4 808 static void
mbed_official 0:51ac1d130fd4 809 snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
mbed_official 0:51ac1d130fd4 810 {
mbed_official 0:51ac1d130fd4 811 struct snmp_msg_pstat *msg_ps;
mbed_official 0:51ac1d130fd4 812 u8_t req_idx;
mbed_official 0:51ac1d130fd4 813 err_t err_ret;
mbed_official 0:51ac1d130fd4 814 u16_t payload_len = p->tot_len;
mbed_official 0:51ac1d130fd4 815 u16_t payload_ofs = 0;
mbed_official 0:51ac1d130fd4 816 u16_t varbind_ofs = 0;
mbed_official 0:51ac1d130fd4 817
mbed_official 0:51ac1d130fd4 818 /* suppress unused argument warning */
mbed_official 0:51ac1d130fd4 819 LWIP_UNUSED_ARG(arg);
mbed_official 0:51ac1d130fd4 820
mbed_official 0:51ac1d130fd4 821 /* traverse input message process list, look for SNMP_MSG_EMPTY */
mbed_official 0:51ac1d130fd4 822 msg_ps = &msg_input_list[0];
mbed_official 0:51ac1d130fd4 823 req_idx = 0;
mbed_official 0:51ac1d130fd4 824 while ((req_idx < SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY))
mbed_official 0:51ac1d130fd4 825 {
mbed_official 0:51ac1d130fd4 826 req_idx++;
mbed_official 0:51ac1d130fd4 827 msg_ps++;
mbed_official 0:51ac1d130fd4 828 }
mbed_official 0:51ac1d130fd4 829 if (req_idx == SNMP_CONCURRENT_REQUESTS)
mbed_official 0:51ac1d130fd4 830 {
mbed_official 0:51ac1d130fd4 831 /* exceeding number of concurrent requests */
mbed_official 0:51ac1d130fd4 832 pbuf_free(p);
mbed_official 0:51ac1d130fd4 833 return;
mbed_official 0:51ac1d130fd4 834 }
mbed_official 0:51ac1d130fd4 835
mbed_official 0:51ac1d130fd4 836 /* accepting request */
mbed_official 0:51ac1d130fd4 837 snmp_inc_snmpinpkts();
mbed_official 0:51ac1d130fd4 838 /* record used 'protocol control block' */
mbed_official 0:51ac1d130fd4 839 msg_ps->pcb = pcb;
mbed_official 0:51ac1d130fd4 840 /* source address (network order) */
mbed_official 0:51ac1d130fd4 841 msg_ps->sip = *addr;
mbed_official 0:51ac1d130fd4 842 /* source port (host order (lwIP oddity)) */
mbed_official 0:51ac1d130fd4 843 msg_ps->sp = port;
mbed_official 0:51ac1d130fd4 844
mbed_official 0:51ac1d130fd4 845 /* check total length, version, community, pdu type */
mbed_official 0:51ac1d130fd4 846 err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
mbed_official 0:51ac1d130fd4 847 /* Only accept requests and requests without error (be robust) */
mbed_official 0:51ac1d130fd4 848 /* Reject response and trap headers or error requests as input! */
mbed_official 0:51ac1d130fd4 849 if ((err_ret != ERR_OK) ||
mbed_official 0:51ac1d130fd4 850 ((msg_ps->rt != SNMP_ASN1_PDU_GET_REQ) &&
mbed_official 0:51ac1d130fd4 851 (msg_ps->rt != SNMP_ASN1_PDU_GET_NEXT_REQ) &&
mbed_official 0:51ac1d130fd4 852 (msg_ps->rt != SNMP_ASN1_PDU_SET_REQ)) ||
mbed_official 0:51ac1d130fd4 853 ((msg_ps->error_status != SNMP_ES_NOERROR) ||
mbed_official 0:51ac1d130fd4 854 (msg_ps->error_index != 0)) )
mbed_official 0:51ac1d130fd4 855 {
mbed_official 0:51ac1d130fd4 856 /* header check failed drop request silently, do not return error! */
mbed_official 0:51ac1d130fd4 857 pbuf_free(p);
mbed_official 0:51ac1d130fd4 858 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
mbed_official 0:51ac1d130fd4 859 return;
mbed_official 0:51ac1d130fd4 860 }
mbed_official 0:51ac1d130fd4 861 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
mbed_official 0:51ac1d130fd4 862
mbed_official 0:51ac1d130fd4 863 /* Builds a list of variable bindings. Copy the varbinds from the pbuf
mbed_official 0:51ac1d130fd4 864 chain to glue them when these are divided over two or more pbuf's. */
mbed_official 0:51ac1d130fd4 865 err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
mbed_official 0:51ac1d130fd4 866 /* we've decoded the incoming message, release input msg now */
mbed_official 0:51ac1d130fd4 867 pbuf_free(p);
mbed_official 0:51ac1d130fd4 868 if ((err_ret != ERR_OK) || (msg_ps->invb.count == 0))
mbed_official 0:51ac1d130fd4 869 {
mbed_official 0:51ac1d130fd4 870 /* varbind-list decode failed, or varbind list empty.
mbed_official 0:51ac1d130fd4 871 drop request silently, do not return error!
mbed_official 0:51ac1d130fd4 872 (errors are only returned for a specific varbind failure) */
mbed_official 0:51ac1d130fd4 873 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
mbed_official 0:51ac1d130fd4 874 return;
mbed_official 0:51ac1d130fd4 875 }
mbed_official 0:51ac1d130fd4 876
mbed_official 0:51ac1d130fd4 877 msg_ps->error_status = SNMP_ES_NOERROR;
mbed_official 0:51ac1d130fd4 878 msg_ps->error_index = 0;
mbed_official 0:51ac1d130fd4 879 /* find object for each variable binding */
mbed_official 0:51ac1d130fd4 880 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
mbed_official 0:51ac1d130fd4 881 /* first variable binding from list to inspect */
mbed_official 0:51ac1d130fd4 882 msg_ps->vb_idx = 0;
mbed_official 0:51ac1d130fd4 883
mbed_official 0:51ac1d130fd4 884 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
mbed_official 0:51ac1d130fd4 885
mbed_official 0:51ac1d130fd4 886 /* handle input event and as much objects as possible in one go */
mbed_official 0:51ac1d130fd4 887 snmp_msg_event(req_idx);
mbed_official 0:51ac1d130fd4 888 }
mbed_official 0:51ac1d130fd4 889
mbed_official 0:51ac1d130fd4 890 /**
mbed_official 0:51ac1d130fd4 891 * Checks and decodes incoming SNMP message header, logs header errors.
mbed_official 0:51ac1d130fd4 892 *
mbed_official 0:51ac1d130fd4 893 * @param p points to pbuf chain of SNMP message (UDP payload)
mbed_official 0:51ac1d130fd4 894 * @param ofs points to first octet of SNMP message
mbed_official 0:51ac1d130fd4 895 * @param pdu_len the length of the UDP payload
mbed_official 0:51ac1d130fd4 896 * @param ofs_ret returns the ofset of the variable bindings
mbed_official 0:51ac1d130fd4 897 * @param m_stat points to the current message request state return
mbed_official 0:51ac1d130fd4 898 * @return
mbed_official 0:51ac1d130fd4 899 * - ERR_OK SNMP header is sane and accepted
mbed_official 0:51ac1d130fd4 900 * - ERR_ARG SNMP header is either malformed or rejected
mbed_official 0:51ac1d130fd4 901 */
mbed_official 0:51ac1d130fd4 902 static err_t
mbed_official 0:51ac1d130fd4 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)
mbed_official 0:51ac1d130fd4 904 {
mbed_official 0:51ac1d130fd4 905 err_t derr;
mbed_official 0:51ac1d130fd4 906 u16_t len, ofs_base;
mbed_official 0:51ac1d130fd4 907 u8_t len_octets;
mbed_official 0:51ac1d130fd4 908 u8_t type;
mbed_official 0:51ac1d130fd4 909 s32_t version;
mbed_official 0:51ac1d130fd4 910
mbed_official 0:51ac1d130fd4 911 ofs_base = ofs;
mbed_official 0:51ac1d130fd4 912 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 913 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 914 if ((derr != ERR_OK) ||
mbed_official 0:51ac1d130fd4 915 (pdu_len != (1 + len_octets + len)) ||
mbed_official 0:51ac1d130fd4 916 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
mbed_official 0:51ac1d130fd4 917 {
mbed_official 0:51ac1d130fd4 918 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 919 return ERR_ARG;
mbed_official 0:51ac1d130fd4 920 }
mbed_official 0:51ac1d130fd4 921 ofs += (1 + len_octets);
mbed_official 0:51ac1d130fd4 922 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 923 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 924 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
mbed_official 0:51ac1d130fd4 925 {
mbed_official 0:51ac1d130fd4 926 /* can't decode or no integer (version) */
mbed_official 0:51ac1d130fd4 927 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 928 return ERR_ARG;
mbed_official 0:51ac1d130fd4 929 }
mbed_official 0:51ac1d130fd4 930 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version);
mbed_official 0:51ac1d130fd4 931 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 932 {
mbed_official 0:51ac1d130fd4 933 /* can't decode */
mbed_official 0:51ac1d130fd4 934 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 935 return ERR_ARG;
mbed_official 0:51ac1d130fd4 936 }
mbed_official 0:51ac1d130fd4 937 if (version != 0)
mbed_official 0:51ac1d130fd4 938 {
mbed_official 0:51ac1d130fd4 939 /* not version 1 */
mbed_official 0:51ac1d130fd4 940 snmp_inc_snmpinbadversions();
mbed_official 0:51ac1d130fd4 941 return ERR_ARG;
mbed_official 0:51ac1d130fd4 942 }
mbed_official 0:51ac1d130fd4 943 ofs += (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 944 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 945 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 946 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)))
mbed_official 0:51ac1d130fd4 947 {
mbed_official 0:51ac1d130fd4 948 /* can't decode or no octet string (community) */
mbed_official 0:51ac1d130fd4 949 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 950 return ERR_ARG;
mbed_official 0:51ac1d130fd4 951 }
mbed_official 0:51ac1d130fd4 952 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community);
mbed_official 0:51ac1d130fd4 953 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 954 {
mbed_official 0:51ac1d130fd4 955 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 956 return ERR_ARG;
mbed_official 0:51ac1d130fd4 957 }
mbed_official 0:51ac1d130fd4 958 /* add zero terminator */
mbed_official 0:51ac1d130fd4 959 len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN));
mbed_official 0:51ac1d130fd4 960 m_stat->community[len] = 0;
mbed_official 0:51ac1d130fd4 961 m_stat->com_strlen = (u8_t)len;
mbed_official 0:51ac1d130fd4 962 if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0)
mbed_official 0:51ac1d130fd4 963 {
mbed_official 0:51ac1d130fd4 964 /** @todo: move this if we need to check more names */
mbed_official 0:51ac1d130fd4 965 snmp_inc_snmpinbadcommunitynames();
mbed_official 0:51ac1d130fd4 966 snmp_authfail_trap();
mbed_official 0:51ac1d130fd4 967 return ERR_ARG;
mbed_official 0:51ac1d130fd4 968 }
mbed_official 0:51ac1d130fd4 969 ofs += (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 970 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 971 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 972 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 973 {
mbed_official 0:51ac1d130fd4 974 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 975 return ERR_ARG;
mbed_official 0:51ac1d130fd4 976 }
mbed_official 0:51ac1d130fd4 977 switch(type)
mbed_official 0:51ac1d130fd4 978 {
mbed_official 0:51ac1d130fd4 979 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ):
mbed_official 0:51ac1d130fd4 980 /* GetRequest PDU */
mbed_official 0:51ac1d130fd4 981 snmp_inc_snmpingetrequests();
mbed_official 0:51ac1d130fd4 982 derr = ERR_OK;
mbed_official 0:51ac1d130fd4 983 break;
mbed_official 0:51ac1d130fd4 984 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ):
mbed_official 0:51ac1d130fd4 985 /* GetNextRequest PDU */
mbed_official 0:51ac1d130fd4 986 snmp_inc_snmpingetnexts();
mbed_official 0:51ac1d130fd4 987 derr = ERR_OK;
mbed_official 0:51ac1d130fd4 988 break;
mbed_official 0:51ac1d130fd4 989 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP):
mbed_official 0:51ac1d130fd4 990 /* GetResponse PDU */
mbed_official 0:51ac1d130fd4 991 snmp_inc_snmpingetresponses();
mbed_official 0:51ac1d130fd4 992 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 993 break;
mbed_official 0:51ac1d130fd4 994 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ):
mbed_official 0:51ac1d130fd4 995 /* SetRequest PDU */
mbed_official 0:51ac1d130fd4 996 snmp_inc_snmpinsetrequests();
mbed_official 0:51ac1d130fd4 997 derr = ERR_OK;
mbed_official 0:51ac1d130fd4 998 break;
mbed_official 0:51ac1d130fd4 999 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP):
mbed_official 0:51ac1d130fd4 1000 /* Trap PDU */
mbed_official 0:51ac1d130fd4 1001 snmp_inc_snmpintraps();
mbed_official 0:51ac1d130fd4 1002 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1003 break;
mbed_official 0:51ac1d130fd4 1004 default:
mbed_official 0:51ac1d130fd4 1005 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1006 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1007 break;
mbed_official 0:51ac1d130fd4 1008 }
mbed_official 0:51ac1d130fd4 1009 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 1010 {
mbed_official 0:51ac1d130fd4 1011 /* unsupported input PDU for this agent (no parse error) */
mbed_official 0:51ac1d130fd4 1012 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1013 }
mbed_official 0:51ac1d130fd4 1014 m_stat->rt = type & 0x1F;
mbed_official 0:51ac1d130fd4 1015 ofs += (1 + len_octets);
mbed_official 0:51ac1d130fd4 1016 if (len != (pdu_len - (ofs - ofs_base)))
mbed_official 0:51ac1d130fd4 1017 {
mbed_official 0:51ac1d130fd4 1018 /* decoded PDU length does not equal actual payload length */
mbed_official 0:51ac1d130fd4 1019 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1020 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1021 }
mbed_official 0:51ac1d130fd4 1022 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 1023 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 1024 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
mbed_official 0:51ac1d130fd4 1025 {
mbed_official 0:51ac1d130fd4 1026 /* can't decode or no integer (request ID) */
mbed_official 0:51ac1d130fd4 1027 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1028 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1029 }
mbed_official 0:51ac1d130fd4 1030 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid);
mbed_official 0:51ac1d130fd4 1031 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 1032 {
mbed_official 0:51ac1d130fd4 1033 /* can't decode */
mbed_official 0:51ac1d130fd4 1034 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1035 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1036 }
mbed_official 0:51ac1d130fd4 1037 ofs += (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 1038 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 1039 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 1040 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
mbed_official 0:51ac1d130fd4 1041 {
mbed_official 0:51ac1d130fd4 1042 /* can't decode or no integer (error-status) */
mbed_official 0:51ac1d130fd4 1043 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1044 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1045 }
mbed_official 0:51ac1d130fd4 1046 /* must be noError (0) for incoming requests.
mbed_official 0:51ac1d130fd4 1047 log errors for mib-2 completeness and for debug purposes */
mbed_official 0:51ac1d130fd4 1048 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status);
mbed_official 0:51ac1d130fd4 1049 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 1050 {
mbed_official 0:51ac1d130fd4 1051 /* can't decode */
mbed_official 0:51ac1d130fd4 1052 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1053 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1054 }
mbed_official 0:51ac1d130fd4 1055 switch (m_stat->error_status)
mbed_official 0:51ac1d130fd4 1056 {
mbed_official 0:51ac1d130fd4 1057 case SNMP_ES_TOOBIG:
mbed_official 0:51ac1d130fd4 1058 snmp_inc_snmpintoobigs();
mbed_official 0:51ac1d130fd4 1059 break;
mbed_official 0:51ac1d130fd4 1060 case SNMP_ES_NOSUCHNAME:
mbed_official 0:51ac1d130fd4 1061 snmp_inc_snmpinnosuchnames();
mbed_official 0:51ac1d130fd4 1062 break;
mbed_official 0:51ac1d130fd4 1063 case SNMP_ES_BADVALUE:
mbed_official 0:51ac1d130fd4 1064 snmp_inc_snmpinbadvalues();
mbed_official 0:51ac1d130fd4 1065 break;
mbed_official 0:51ac1d130fd4 1066 case SNMP_ES_READONLY:
mbed_official 0:51ac1d130fd4 1067 snmp_inc_snmpinreadonlys();
mbed_official 0:51ac1d130fd4 1068 break;
mbed_official 0:51ac1d130fd4 1069 case SNMP_ES_GENERROR:
mbed_official 0:51ac1d130fd4 1070 snmp_inc_snmpingenerrs();
mbed_official 0:51ac1d130fd4 1071 break;
mbed_official 0:51ac1d130fd4 1072 }
mbed_official 0:51ac1d130fd4 1073 ofs += (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 1074 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 1075 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 1076 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
mbed_official 0:51ac1d130fd4 1077 {
mbed_official 0:51ac1d130fd4 1078 /* can't decode or no integer (error-index) */
mbed_official 0:51ac1d130fd4 1079 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1080 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1081 }
mbed_official 0:51ac1d130fd4 1082 /* must be 0 for incoming requests.
mbed_official 0:51ac1d130fd4 1083 decode anyway to catch bad integers (and dirty tricks) */
mbed_official 0:51ac1d130fd4 1084 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index);
mbed_official 0:51ac1d130fd4 1085 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 1086 {
mbed_official 0:51ac1d130fd4 1087 /* can't decode */
mbed_official 0:51ac1d130fd4 1088 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1089 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1090 }
mbed_official 0:51ac1d130fd4 1091 ofs += (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 1092 *ofs_ret = ofs;
mbed_official 0:51ac1d130fd4 1093 return ERR_OK;
mbed_official 0:51ac1d130fd4 1094 }
mbed_official 0:51ac1d130fd4 1095
mbed_official 0:51ac1d130fd4 1096 static err_t
mbed_official 0:51ac1d130fd4 1097 snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
mbed_official 0:51ac1d130fd4 1098 {
mbed_official 0:51ac1d130fd4 1099 err_t derr;
mbed_official 0:51ac1d130fd4 1100 u16_t len, vb_len;
mbed_official 0:51ac1d130fd4 1101 u8_t len_octets;
mbed_official 0:51ac1d130fd4 1102 u8_t type;
mbed_official 0:51ac1d130fd4 1103
mbed_official 0:51ac1d130fd4 1104 /* variable binding list */
mbed_official 0:51ac1d130fd4 1105 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 1106 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len);
mbed_official 0:51ac1d130fd4 1107 if ((derr != ERR_OK) ||
mbed_official 0:51ac1d130fd4 1108 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
mbed_official 0:51ac1d130fd4 1109 {
mbed_official 0:51ac1d130fd4 1110 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1111 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1112 }
mbed_official 0:51ac1d130fd4 1113 ofs += (1 + len_octets);
mbed_official 0:51ac1d130fd4 1114
mbed_official 0:51ac1d130fd4 1115 /* start with empty list */
mbed_official 0:51ac1d130fd4 1116 m_stat->invb.count = 0;
mbed_official 0:51ac1d130fd4 1117 m_stat->invb.head = NULL;
mbed_official 0:51ac1d130fd4 1118 m_stat->invb.tail = NULL;
mbed_official 0:51ac1d130fd4 1119
mbed_official 0:51ac1d130fd4 1120 while (vb_len > 0)
mbed_official 0:51ac1d130fd4 1121 {
mbed_official 0:51ac1d130fd4 1122 struct snmp_obj_id oid, oid_value;
mbed_official 0:51ac1d130fd4 1123 struct snmp_varbind *vb;
mbed_official 0:51ac1d130fd4 1124
mbed_official 0:51ac1d130fd4 1125 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 1126 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 1127 if ((derr != ERR_OK) ||
mbed_official 0:51ac1d130fd4 1128 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) ||
mbed_official 0:51ac1d130fd4 1129 (len == 0) || (len > vb_len))
mbed_official 0:51ac1d130fd4 1130 {
mbed_official 0:51ac1d130fd4 1131 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1132 /* free varbinds (if available) */
mbed_official 0:51ac1d130fd4 1133 snmp_varbind_list_free(&m_stat->invb);
mbed_official 0:51ac1d130fd4 1134 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1135 }
mbed_official 0:51ac1d130fd4 1136 ofs += (1 + len_octets);
mbed_official 0:51ac1d130fd4 1137 vb_len -= (1 + len_octets);
mbed_official 0:51ac1d130fd4 1138
mbed_official 0:51ac1d130fd4 1139 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 1140 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 1141 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)))
mbed_official 0:51ac1d130fd4 1142 {
mbed_official 0:51ac1d130fd4 1143 /* can't decode object name length */
mbed_official 0:51ac1d130fd4 1144 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1145 /* free varbinds (if available) */
mbed_official 0:51ac1d130fd4 1146 snmp_varbind_list_free(&m_stat->invb);
mbed_official 0:51ac1d130fd4 1147 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1148 }
mbed_official 0:51ac1d130fd4 1149 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid);
mbed_official 0:51ac1d130fd4 1150 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 1151 {
mbed_official 0:51ac1d130fd4 1152 /* can't decode object name */
mbed_official 0:51ac1d130fd4 1153 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1154 /* free varbinds (if available) */
mbed_official 0:51ac1d130fd4 1155 snmp_varbind_list_free(&m_stat->invb);
mbed_official 0:51ac1d130fd4 1156 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1157 }
mbed_official 0:51ac1d130fd4 1158 ofs += (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 1159 vb_len -= (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 1160
mbed_official 0:51ac1d130fd4 1161 snmp_asn1_dec_type(p, ofs, &type);
mbed_official 0:51ac1d130fd4 1162 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
mbed_official 0:51ac1d130fd4 1163 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 1164 {
mbed_official 0:51ac1d130fd4 1165 /* can't decode object value length */
mbed_official 0:51ac1d130fd4 1166 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1167 /* free varbinds (if available) */
mbed_official 0:51ac1d130fd4 1168 snmp_varbind_list_free(&m_stat->invb);
mbed_official 0:51ac1d130fd4 1169 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1170 }
mbed_official 0:51ac1d130fd4 1171
mbed_official 0:51ac1d130fd4 1172 switch (type)
mbed_official 0:51ac1d130fd4 1173 {
mbed_official 0:51ac1d130fd4 1174 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
mbed_official 0:51ac1d130fd4 1175 vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t));
mbed_official 0:51ac1d130fd4 1176 if (vb != NULL)
mbed_official 0:51ac1d130fd4 1177 {
mbed_official 0:51ac1d130fd4 1178 s32_t *vptr = (s32_t*)vb->value;
mbed_official 0:51ac1d130fd4 1179
mbed_official 0:51ac1d130fd4 1180 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr);
mbed_official 0:51ac1d130fd4 1181 snmp_varbind_tail_add(&m_stat->invb, vb);
mbed_official 0:51ac1d130fd4 1182 }
mbed_official 0:51ac1d130fd4 1183 else
mbed_official 0:51ac1d130fd4 1184 {
mbed_official 0:51ac1d130fd4 1185 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1186 }
mbed_official 0:51ac1d130fd4 1187 break;
mbed_official 0:51ac1d130fd4 1188 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
mbed_official 0:51ac1d130fd4 1189 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
mbed_official 0:51ac1d130fd4 1190 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
mbed_official 0:51ac1d130fd4 1191 vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t));
mbed_official 0:51ac1d130fd4 1192 if (vb != NULL)
mbed_official 0:51ac1d130fd4 1193 {
mbed_official 0:51ac1d130fd4 1194 u32_t *vptr = (u32_t*)vb->value;
mbed_official 0:51ac1d130fd4 1195
mbed_official 0:51ac1d130fd4 1196 derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr);
mbed_official 0:51ac1d130fd4 1197 snmp_varbind_tail_add(&m_stat->invb, vb);
mbed_official 0:51ac1d130fd4 1198 }
mbed_official 0:51ac1d130fd4 1199 else
mbed_official 0:51ac1d130fd4 1200 {
mbed_official 0:51ac1d130fd4 1201 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1202 }
mbed_official 0:51ac1d130fd4 1203 break;
mbed_official 0:51ac1d130fd4 1204 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
mbed_official 0:51ac1d130fd4 1205 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
mbed_official 0:51ac1d130fd4 1206 LWIP_ASSERT("invalid length", len <= 0xff);
mbed_official 0:51ac1d130fd4 1207 vb = snmp_varbind_alloc(&oid, type, (u8_t)len);
mbed_official 0:51ac1d130fd4 1208 if (vb != NULL)
mbed_official 0:51ac1d130fd4 1209 {
mbed_official 0:51ac1d130fd4 1210 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
mbed_official 0:51ac1d130fd4 1211 snmp_varbind_tail_add(&m_stat->invb, vb);
mbed_official 0:51ac1d130fd4 1212 }
mbed_official 0:51ac1d130fd4 1213 else
mbed_official 0:51ac1d130fd4 1214 {
mbed_official 0:51ac1d130fd4 1215 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1216 }
mbed_official 0:51ac1d130fd4 1217 break;
mbed_official 0:51ac1d130fd4 1218 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
mbed_official 0:51ac1d130fd4 1219 vb = snmp_varbind_alloc(&oid, type, 0);
mbed_official 0:51ac1d130fd4 1220 if (vb != NULL)
mbed_official 0:51ac1d130fd4 1221 {
mbed_official 0:51ac1d130fd4 1222 snmp_varbind_tail_add(&m_stat->invb, vb);
mbed_official 0:51ac1d130fd4 1223 derr = ERR_OK;
mbed_official 0:51ac1d130fd4 1224 }
mbed_official 0:51ac1d130fd4 1225 else
mbed_official 0:51ac1d130fd4 1226 {
mbed_official 0:51ac1d130fd4 1227 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1228 }
mbed_official 0:51ac1d130fd4 1229 break;
mbed_official 0:51ac1d130fd4 1230 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
mbed_official 0:51ac1d130fd4 1231 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value);
mbed_official 0:51ac1d130fd4 1232 if (derr == ERR_OK)
mbed_official 0:51ac1d130fd4 1233 {
mbed_official 0:51ac1d130fd4 1234 vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t));
mbed_official 0:51ac1d130fd4 1235 if (vb != NULL)
mbed_official 0:51ac1d130fd4 1236 {
mbed_official 0:51ac1d130fd4 1237 u8_t i = oid_value.len;
mbed_official 0:51ac1d130fd4 1238 s32_t *vptr = (s32_t*)vb->value;
mbed_official 0:51ac1d130fd4 1239
mbed_official 0:51ac1d130fd4 1240 while(i > 0)
mbed_official 0:51ac1d130fd4 1241 {
mbed_official 0:51ac1d130fd4 1242 i--;
mbed_official 0:51ac1d130fd4 1243 vptr[i] = oid_value.id[i];
mbed_official 0:51ac1d130fd4 1244 }
mbed_official 0:51ac1d130fd4 1245 snmp_varbind_tail_add(&m_stat->invb, vb);
mbed_official 0:51ac1d130fd4 1246 derr = ERR_OK;
mbed_official 0:51ac1d130fd4 1247 }
mbed_official 0:51ac1d130fd4 1248 else
mbed_official 0:51ac1d130fd4 1249 {
mbed_official 0:51ac1d130fd4 1250 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1251 }
mbed_official 0:51ac1d130fd4 1252 }
mbed_official 0:51ac1d130fd4 1253 break;
mbed_official 0:51ac1d130fd4 1254 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
mbed_official 0:51ac1d130fd4 1255 if (len == 4)
mbed_official 0:51ac1d130fd4 1256 {
mbed_official 0:51ac1d130fd4 1257 /* must be exactly 4 octets! */
mbed_official 0:51ac1d130fd4 1258 vb = snmp_varbind_alloc(&oid, type, 4);
mbed_official 0:51ac1d130fd4 1259 if (vb != NULL)
mbed_official 0:51ac1d130fd4 1260 {
mbed_official 0:51ac1d130fd4 1261 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, (u8_t*)vb->value);
mbed_official 0:51ac1d130fd4 1262 snmp_varbind_tail_add(&m_stat->invb, vb);
mbed_official 0:51ac1d130fd4 1263 }
mbed_official 0:51ac1d130fd4 1264 else
mbed_official 0:51ac1d130fd4 1265 {
mbed_official 0:51ac1d130fd4 1266 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1267 }
mbed_official 0:51ac1d130fd4 1268 }
mbed_official 0:51ac1d130fd4 1269 else
mbed_official 0:51ac1d130fd4 1270 {
mbed_official 0:51ac1d130fd4 1271 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1272 }
mbed_official 0:51ac1d130fd4 1273 break;
mbed_official 0:51ac1d130fd4 1274 default:
mbed_official 0:51ac1d130fd4 1275 derr = ERR_ARG;
mbed_official 0:51ac1d130fd4 1276 break;
mbed_official 0:51ac1d130fd4 1277 }
mbed_official 0:51ac1d130fd4 1278 if (derr != ERR_OK)
mbed_official 0:51ac1d130fd4 1279 {
mbed_official 0:51ac1d130fd4 1280 snmp_inc_snmpinasnparseerrs();
mbed_official 0:51ac1d130fd4 1281 /* free varbinds (if available) */
mbed_official 0:51ac1d130fd4 1282 snmp_varbind_list_free(&m_stat->invb);
mbed_official 0:51ac1d130fd4 1283 return ERR_ARG;
mbed_official 0:51ac1d130fd4 1284 }
mbed_official 0:51ac1d130fd4 1285 ofs += (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 1286 vb_len -= (1 + len_octets + len);
mbed_official 0:51ac1d130fd4 1287 }
mbed_official 0:51ac1d130fd4 1288
mbed_official 0:51ac1d130fd4 1289 if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ)
mbed_official 0:51ac1d130fd4 1290 {
mbed_official 0:51ac1d130fd4 1291 snmp_add_snmpintotalsetvars(m_stat->invb.count);
mbed_official 0:51ac1d130fd4 1292 }
mbed_official 0:51ac1d130fd4 1293 else
mbed_official 0:51ac1d130fd4 1294 {
mbed_official 0:51ac1d130fd4 1295 snmp_add_snmpintotalreqvars(m_stat->invb.count);
mbed_official 0:51ac1d130fd4 1296 }
mbed_official 0:51ac1d130fd4 1297
mbed_official 0:51ac1d130fd4 1298 *ofs_ret = ofs;
mbed_official 0:51ac1d130fd4 1299 return ERR_OK;
mbed_official 0:51ac1d130fd4 1300 }
mbed_official 0:51ac1d130fd4 1301
mbed_official 0:51ac1d130fd4 1302 struct snmp_varbind*
mbed_official 0:51ac1d130fd4 1303 snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
mbed_official 0:51ac1d130fd4 1304 {
mbed_official 0:51ac1d130fd4 1305 struct snmp_varbind *vb;
mbed_official 0:51ac1d130fd4 1306
mbed_official 0:51ac1d130fd4 1307 vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
mbed_official 0:51ac1d130fd4 1308 LWIP_ASSERT("vb != NULL",vb != NULL);
mbed_official 0:51ac1d130fd4 1309 if (vb != NULL)
mbed_official 0:51ac1d130fd4 1310 {
mbed_official 0:51ac1d130fd4 1311 u8_t i;
mbed_official 0:51ac1d130fd4 1312
mbed_official 0:51ac1d130fd4 1313 vb->next = NULL;
mbed_official 0:51ac1d130fd4 1314 vb->prev = NULL;
mbed_official 0:51ac1d130fd4 1315 i = oid->len;
mbed_official 0:51ac1d130fd4 1316 vb->ident_len = i;
mbed_official 0:51ac1d130fd4 1317 if (i > 0)
mbed_official 0:51ac1d130fd4 1318 {
mbed_official 0:51ac1d130fd4 1319 LWIP_ASSERT("SNMP_MAX_TREE_DEPTH is configured too low", i <= SNMP_MAX_TREE_DEPTH);
mbed_official 0:51ac1d130fd4 1320 /* allocate array of s32_t for our object identifier */
mbed_official 0:51ac1d130fd4 1321 vb->ident = (s32_t*)memp_malloc(MEMP_SNMP_VALUE);
mbed_official 0:51ac1d130fd4 1322 LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL);
mbed_official 0:51ac1d130fd4 1323 if (vb->ident == NULL)
mbed_official 0:51ac1d130fd4 1324 {
mbed_official 0:51ac1d130fd4 1325 memp_free(MEMP_SNMP_VARBIND, vb);
mbed_official 0:51ac1d130fd4 1326 return NULL;
mbed_official 0:51ac1d130fd4 1327 }
mbed_official 0:51ac1d130fd4 1328 while(i > 0)
mbed_official 0:51ac1d130fd4 1329 {
mbed_official 0:51ac1d130fd4 1330 i--;
mbed_official 0:51ac1d130fd4 1331 vb->ident[i] = oid->id[i];
mbed_official 0:51ac1d130fd4 1332 }
mbed_official 0:51ac1d130fd4 1333 }
mbed_official 0:51ac1d130fd4 1334 else
mbed_official 0:51ac1d130fd4 1335 {
mbed_official 0:51ac1d130fd4 1336 /* i == 0, pass zero length object identifier */
mbed_official 0:51ac1d130fd4 1337 vb->ident = NULL;
mbed_official 0:51ac1d130fd4 1338 }
mbed_official 0:51ac1d130fd4 1339 vb->value_type = type;
mbed_official 0:51ac1d130fd4 1340 vb->value_len = len;
mbed_official 0:51ac1d130fd4 1341 if (len > 0)
mbed_official 0:51ac1d130fd4 1342 {
mbed_official 0:51ac1d130fd4 1343 LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
mbed_official 0:51ac1d130fd4 1344 /* allocate raw bytes for our object value */
mbed_official 0:51ac1d130fd4 1345 vb->value = memp_malloc(MEMP_SNMP_VALUE);
mbed_official 0:51ac1d130fd4 1346 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
mbed_official 0:51ac1d130fd4 1347 if (vb->value == NULL)
mbed_official 0:51ac1d130fd4 1348 {
mbed_official 0:51ac1d130fd4 1349 if (vb->ident != NULL)
mbed_official 0:51ac1d130fd4 1350 {
mbed_official 0:51ac1d130fd4 1351 memp_free(MEMP_SNMP_VALUE, vb->ident);
mbed_official 0:51ac1d130fd4 1352 }
mbed_official 0:51ac1d130fd4 1353 memp_free(MEMP_SNMP_VARBIND, vb);
mbed_official 0:51ac1d130fd4 1354 return NULL;
mbed_official 0:51ac1d130fd4 1355 }
mbed_official 0:51ac1d130fd4 1356 }
mbed_official 0:51ac1d130fd4 1357 else
mbed_official 0:51ac1d130fd4 1358 {
mbed_official 0:51ac1d130fd4 1359 /* ASN1_NUL type, or zero length ASN1_OC_STR */
mbed_official 0:51ac1d130fd4 1360 vb->value = NULL;
mbed_official 0:51ac1d130fd4 1361 }
mbed_official 0:51ac1d130fd4 1362 }
mbed_official 0:51ac1d130fd4 1363 return vb;
mbed_official 0:51ac1d130fd4 1364 }
mbed_official 0:51ac1d130fd4 1365
mbed_official 0:51ac1d130fd4 1366 void
mbed_official 0:51ac1d130fd4 1367 snmp_varbind_free(struct snmp_varbind *vb)
mbed_official 0:51ac1d130fd4 1368 {
mbed_official 0:51ac1d130fd4 1369 if (vb->value != NULL )
mbed_official 0:51ac1d130fd4 1370 {
mbed_official 0:51ac1d130fd4 1371 memp_free(MEMP_SNMP_VALUE, vb->value);
mbed_official 0:51ac1d130fd4 1372 }
mbed_official 0:51ac1d130fd4 1373 if (vb->ident != NULL )
mbed_official 0:51ac1d130fd4 1374 {
mbed_official 0:51ac1d130fd4 1375 memp_free(MEMP_SNMP_VALUE, vb->ident);
mbed_official 0:51ac1d130fd4 1376 }
mbed_official 0:51ac1d130fd4 1377 memp_free(MEMP_SNMP_VARBIND, vb);
mbed_official 0:51ac1d130fd4 1378 }
mbed_official 0:51ac1d130fd4 1379
mbed_official 0:51ac1d130fd4 1380 void
mbed_official 0:51ac1d130fd4 1381 snmp_varbind_list_free(struct snmp_varbind_root *root)
mbed_official 0:51ac1d130fd4 1382 {
mbed_official 0:51ac1d130fd4 1383 struct snmp_varbind *vb, *prev;
mbed_official 0:51ac1d130fd4 1384
mbed_official 0:51ac1d130fd4 1385 vb = root->tail;
mbed_official 0:51ac1d130fd4 1386 while ( vb != NULL )
mbed_official 0:51ac1d130fd4 1387 {
mbed_official 0:51ac1d130fd4 1388 prev = vb->prev;
mbed_official 0:51ac1d130fd4 1389 snmp_varbind_free(vb);
mbed_official 0:51ac1d130fd4 1390 vb = prev;
mbed_official 0:51ac1d130fd4 1391 }
mbed_official 0:51ac1d130fd4 1392 root->count = 0;
mbed_official 0:51ac1d130fd4 1393 root->head = NULL;
mbed_official 0:51ac1d130fd4 1394 root->tail = NULL;
mbed_official 0:51ac1d130fd4 1395 }
mbed_official 0:51ac1d130fd4 1396
mbed_official 0:51ac1d130fd4 1397 void
mbed_official 0:51ac1d130fd4 1398 snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb)
mbed_official 0:51ac1d130fd4 1399 {
mbed_official 0:51ac1d130fd4 1400 if (root->count == 0)
mbed_official 0:51ac1d130fd4 1401 {
mbed_official 0:51ac1d130fd4 1402 /* add first varbind to list */
mbed_official 0:51ac1d130fd4 1403 root->head = vb;
mbed_official 0:51ac1d130fd4 1404 root->tail = vb;
mbed_official 0:51ac1d130fd4 1405 }
mbed_official 0:51ac1d130fd4 1406 else
mbed_official 0:51ac1d130fd4 1407 {
mbed_official 0:51ac1d130fd4 1408 /* add nth varbind to list tail */
mbed_official 0:51ac1d130fd4 1409 root->tail->next = vb;
mbed_official 0:51ac1d130fd4 1410 vb->prev = root->tail;
mbed_official 0:51ac1d130fd4 1411 root->tail = vb;
mbed_official 0:51ac1d130fd4 1412 }
mbed_official 0:51ac1d130fd4 1413 root->count += 1;
mbed_official 0:51ac1d130fd4 1414 }
mbed_official 0:51ac1d130fd4 1415
mbed_official 0:51ac1d130fd4 1416 struct snmp_varbind*
mbed_official 0:51ac1d130fd4 1417 snmp_varbind_tail_remove(struct snmp_varbind_root *root)
mbed_official 0:51ac1d130fd4 1418 {
mbed_official 0:51ac1d130fd4 1419 struct snmp_varbind* vb;
mbed_official 0:51ac1d130fd4 1420
mbed_official 0:51ac1d130fd4 1421 if (root->count > 0)
mbed_official 0:51ac1d130fd4 1422 {
mbed_official 0:51ac1d130fd4 1423 /* remove tail varbind */
mbed_official 0:51ac1d130fd4 1424 vb = root->tail;
mbed_official 0:51ac1d130fd4 1425 root->tail = vb->prev;
mbed_official 0:51ac1d130fd4 1426 vb->prev->next = NULL;
mbed_official 0:51ac1d130fd4 1427 root->count -= 1;
mbed_official 0:51ac1d130fd4 1428 }
mbed_official 0:51ac1d130fd4 1429 else
mbed_official 0:51ac1d130fd4 1430 {
mbed_official 0:51ac1d130fd4 1431 /* nothing to remove */
mbed_official 0:51ac1d130fd4 1432 vb = NULL;
mbed_official 0:51ac1d130fd4 1433 }
mbed_official 0:51ac1d130fd4 1434 return vb;
mbed_official 0:51ac1d130fd4 1435 }
mbed_official 0:51ac1d130fd4 1436
mbed_official 0:51ac1d130fd4 1437 #endif /* LWIP_SNMP */