3 * SNMP input message processing (RFC1157).
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7 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
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8 * All rights reserved.
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10 * Redistribution and use in source and binary forms, with or without modification,
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11 * are permitted provided that the following conditions are met:
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13 * 1. Redistributions of source code must retain the above copyright notice,
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14 * this list of conditions and the following disclaimer.
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15 * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 * this list of conditions and the following disclaimer in the documentation
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17 * and/or other materials provided with the distribution.
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18 * 3. The name of the author may not be used to endorse or promote products
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19 * derived from this software without specific prior written permission.
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21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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32 * Author: Christiaan Simons <christiaan.simons@axon.tv>
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35 #include "lwip/opt.h"
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37 #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
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39 #include "lwip/ip_addr.h"
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40 #include "lwip/mem.h"
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41 #include "lwip/udp.h"
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42 #include "lwip/stats.h"
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43 #include "lwip/snmp.h"
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44 #include "lwip/snmp_asn1.h"
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45 #include "lwip/snmp_msg.h"
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46 #include "lwip/snmp_structs.h"
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50 /* public (non-static) constants */
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52 const s32_t snmp_version = 0;
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53 /** default SNMP community string */
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54 const char snmp_publiccommunity[7] = "public";
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56 /* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
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57 struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
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58 /* UDP Protocol Control Block */
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59 struct udp_pcb *snmp1_pcb;
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61 static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port);
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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);
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63 static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat);
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67 * Starts SNMP Agent.
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68 * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
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73 struct snmp_msg_pstat *msg_ps;
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76 snmp1_pcb = udp_new();
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77 if (snmp1_pcb != NULL)
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79 udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
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80 udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
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82 msg_ps = &msg_input_list[0];
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83 for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
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85 msg_ps->state = SNMP_MSG_EMPTY;
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86 msg_ps->error_index = 0;
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87 msg_ps->error_status = SNMP_ES_NOERROR;
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90 trap_msg.pcb = snmp1_pcb;
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91 /* The coldstart trap will only be output
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92 if our outgoing interface is up & configured */
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93 snmp_coldstart_trap();
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97 snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
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99 snmp_varbind_list_free(&msg_ps->outvb);
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100 msg_ps->outvb = msg_ps->invb;
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101 msg_ps->invb.head = NULL;
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102 msg_ps->invb.tail = NULL;
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103 msg_ps->invb.count = 0;
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104 msg_ps->error_status = error;
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105 msg_ps->error_index = 1 + msg_ps->vb_idx;
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106 snmp_send_response(msg_ps);
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107 snmp_varbind_list_free(&msg_ps->outvb);
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108 msg_ps->state = SNMP_MSG_EMPTY;
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112 snmp_ok_response(struct snmp_msg_pstat *msg_ps)
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116 err_ret = snmp_send_response(msg_ps);
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117 if (err_ret == ERR_MEM)
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119 /* serious memory problem, can't return tooBig */
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123 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
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125 /* free varbinds (if available) */
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126 snmp_varbind_list_free(&msg_ps->invb);
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127 snmp_varbind_list_free(&msg_ps->outvb);
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128 msg_ps->state = SNMP_MSG_EMPTY;
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132 * Service an internal or external event for SNMP GET.
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134 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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135 * @param msg_ps points to the assosicated message process state
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138 snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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140 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
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142 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
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144 struct mib_external_node *en;
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145 struct snmp_name_ptr np;
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147 /* get_object_def() answer*/
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148 en = msg_ps->ext_mib_node;
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149 np = msg_ps->ext_name_ptr;
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151 /* translate answer into a known lifeform */
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152 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
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153 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
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155 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
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156 en->get_value_q(request_id, &msg_ps->ext_object_def);
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160 en->get_object_def_pc(request_id, np.ident_len, np.ident);
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161 /* search failed, object id points to unknown object (nosuchname) */
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162 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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165 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
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167 struct mib_external_node *en;
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168 struct snmp_varbind *vb;
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170 /* get_value() answer */
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171 en = msg_ps->ext_mib_node;
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173 /* allocate output varbind */
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174 vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind));
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175 LWIP_ASSERT("vb != NULL",vb != NULL);
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181 /* move name from invb to outvb */
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182 vb->ident = msg_ps->vb_ptr->ident;
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183 vb->ident_len = msg_ps->vb_ptr->ident_len;
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184 /* ensure this memory is refereced once only */
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185 msg_ps->vb_ptr->ident = NULL;
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186 msg_ps->vb_ptr->ident_len = 0;
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188 vb->value_type = msg_ps->ext_object_def.asn_type;
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189 vb->value_len = msg_ps->ext_object_def.v_len;
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190 if (vb->value_len > 0)
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192 vb->value = mem_malloc(vb->value_len);
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193 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
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194 if (vb->value != NULL)
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196 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
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197 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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198 /* search again (if vb_idx < msg_ps->invb.count) */
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199 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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200 msg_ps->vb_idx += 1;
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204 en->get_value_pc(request_id, &msg_ps->ext_object_def);
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205 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
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206 msg_ps->vb_ptr->ident = vb->ident;
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207 msg_ps->vb_ptr->ident_len = vb->ident_len;
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209 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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214 /* vb->value_len == 0, empty value (e.g. empty string) */
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215 en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
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217 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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218 /* search again (if vb_idx < msg_ps->invb.count) */
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219 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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220 msg_ps->vb_idx += 1;
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225 en->get_value_pc(request_id, &msg_ps->ext_object_def);
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226 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
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227 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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231 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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232 (msg_ps->vb_idx < msg_ps->invb.count))
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234 struct mib_node *mn;
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235 struct snmp_name_ptr np;
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237 if (msg_ps->vb_idx == 0)
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239 msg_ps->vb_ptr = msg_ps->invb.head;
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243 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
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245 /** test object identifier for .iso.org.dod.internet prefix */
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246 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
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248 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
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249 msg_ps->vb_ptr->ident + 4, &np);
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252 if (mn->node_type == MIB_NODE_EX)
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254 /* external object */
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255 struct mib_external_node *en = (struct mib_external_node*)mn;
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257 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
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258 /* save en && args in msg_ps!! */
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259 msg_ps->ext_mib_node = en;
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260 msg_ps->ext_name_ptr = np;
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262 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
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266 /* internal object */
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267 struct obj_def object_def;
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269 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
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270 mn->get_object_def(np.ident_len, np.ident, &object_def);
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271 if (object_def.instance != MIB_OBJECT_NONE)
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277 /* search failed, object id points to unknown object (nosuchname) */
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282 struct snmp_varbind *vb;
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284 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
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285 /* allocate output varbind */
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286 vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind));
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287 LWIP_ASSERT("vb != NULL",vb != NULL);
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293 /* move name from invb to outvb */
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294 vb->ident = msg_ps->vb_ptr->ident;
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295 vb->ident_len = msg_ps->vb_ptr->ident_len;
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296 /* ensure this memory is refereced once only */
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297 msg_ps->vb_ptr->ident = NULL;
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298 msg_ps->vb_ptr->ident_len = 0;
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300 vb->value_type = object_def.asn_type;
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301 vb->value_len = object_def.v_len;
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302 if (vb->value_len > 0)
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304 vb->value = mem_malloc(vb->value_len);
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305 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
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306 if (vb->value != NULL)
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308 mn->get_value(&object_def, vb->value_len, vb->value);
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309 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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310 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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311 msg_ps->vb_idx += 1;
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315 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
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316 msg_ps->vb_ptr->ident = vb->ident;
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317 msg_ps->vb_ptr->ident_len = vb->ident_len;
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319 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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324 /* vb->value_len == 0, empty value (e.g. empty string) */
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326 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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327 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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328 msg_ps->vb_idx += 1;
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333 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n"));
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334 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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346 /* mn == NULL, noSuchName */
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347 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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350 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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351 (msg_ps->vb_idx == msg_ps->invb.count))
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353 snmp_ok_response(msg_ps);
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358 * Service an internal or external event for SNMP GETNEXT.
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360 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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361 * @param msg_ps points to the assosicated message process state
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364 snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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366 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
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368 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
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370 struct mib_external_node *en;
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372 /* get_object_def() answer*/
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373 en = msg_ps->ext_mib_node;
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375 /* translate answer into a known lifeform */
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376 en->get_object_def_a(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1], &msg_ps->ext_object_def);
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377 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
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379 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
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380 en->get_value_q(request_id, &msg_ps->ext_object_def);
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384 en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
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385 /* search failed, object id points to unknown object (nosuchname) */
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386 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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389 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
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391 struct mib_external_node *en;
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392 struct snmp_varbind *vb;
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394 /* get_value() answer */
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395 en = msg_ps->ext_mib_node;
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397 vb = snmp_varbind_alloc(&msg_ps->ext_oid,
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398 msg_ps->ext_object_def.asn_type,
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399 msg_ps->ext_object_def.v_len);
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402 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
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403 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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404 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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405 msg_ps->vb_idx += 1;
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409 en->get_value_pc(request_id, &msg_ps->ext_object_def);
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410 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
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411 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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415 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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416 (msg_ps->vb_idx < msg_ps->invb.count))
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418 struct mib_node *mn;
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419 struct snmp_obj_id oid;
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421 if (msg_ps->vb_idx == 0)
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423 msg_ps->vb_ptr = msg_ps->invb.head;
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427 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
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429 if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
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431 if (msg_ps->vb_ptr->ident_len > 3)
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433 /* can offset ident_len and ident */
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434 mn = snmp_expand_tree((struct mib_node*)&internet,
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435 msg_ps->vb_ptr->ident_len - 4,
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436 msg_ps->vb_ptr->ident + 4, &oid);
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440 /* can't offset ident_len -4, ident + 4 */
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441 mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid);
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450 if (mn->node_type == MIB_NODE_EX)
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452 /* external object */
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453 struct mib_external_node *en = (struct mib_external_node*)mn;
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455 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
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456 /* save en && args in msg_ps!! */
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457 msg_ps->ext_mib_node = en;
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458 msg_ps->ext_oid = oid;
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460 en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]);
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464 /* internal object */
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465 struct obj_def object_def;
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466 struct snmp_varbind *vb;
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468 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
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469 mn->get_object_def(1, &oid.id[oid.len - 1], &object_def);
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471 vb = snmp_varbind_alloc(&oid, object_def.asn_type, object_def.v_len);
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474 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
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475 mn->get_value(&object_def, object_def.v_len, vb->value);
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476 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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477 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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478 msg_ps->vb_idx += 1;
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482 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n"));
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483 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
\r
489 /* mn == NULL, noSuchName */
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490 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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493 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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494 (msg_ps->vb_idx == msg_ps->invb.count))
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496 snmp_ok_response(msg_ps);
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501 * Service an internal or external event for SNMP SET.
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503 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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504 * @param msg_ps points to the assosicated message process state
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507 snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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509 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
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511 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
\r
513 struct mib_external_node *en;
\r
514 struct snmp_name_ptr np;
\r
516 /* get_object_def() answer*/
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517 en = msg_ps->ext_mib_node;
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518 np = msg_ps->ext_name_ptr;
\r
520 /* translate answer into a known lifeform */
\r
521 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
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522 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
\r
524 msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST;
\r
525 en->set_test_q(request_id, &msg_ps->ext_object_def);
\r
529 en->get_object_def_pc(request_id, np.ident_len, np.ident);
\r
530 /* search failed, object id points to unknown object (nosuchname) */
\r
531 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
534 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST)
\r
536 struct mib_external_node *en;
\r
538 /* set_test() answer*/
\r
539 en = msg_ps->ext_mib_node;
\r
541 if (msg_ps->ext_object_def.access == MIB_OBJECT_READ_WRITE)
\r
543 if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) &&
\r
544 (en->set_test_a(request_id,&msg_ps->ext_object_def,
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545 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
\r
547 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
\r
548 msg_ps->vb_idx += 1;
\r
552 en->set_test_pc(request_id,&msg_ps->ext_object_def);
\r
554 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
\r
559 en->set_test_pc(request_id,&msg_ps->ext_object_def);
\r
560 /* object not available for set */
\r
561 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
564 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S)
\r
566 struct mib_external_node *en;
\r
567 struct snmp_name_ptr np;
\r
569 /* get_object_def() answer*/
\r
570 en = msg_ps->ext_mib_node;
\r
571 np = msg_ps->ext_name_ptr;
\r
573 /* translate answer into a known lifeform */
\r
574 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
\r
575 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
\r
577 msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE;
\r
578 en->set_value_q(request_id, &msg_ps->ext_object_def,
\r
579 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
\r
583 en->get_object_def_pc(request_id, np.ident_len, np.ident);
\r
584 /* set_value failed, object has disappeared for some odd reason?? */
\r
585 snmp_error_response(msg_ps,SNMP_ES_GENERROR);
\r
588 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE)
\r
590 struct mib_external_node *en;
\r
592 /** set_value_a() @todo: use reply value?? */
\r
593 en = msg_ps->ext_mib_node;
\r
594 en->set_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
\r
596 /** @todo use set_value_pc() if toobig */
\r
597 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
\r
598 msg_ps->vb_idx += 1;
\r
601 /* test all values before setting */
\r
602 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
\r
603 (msg_ps->vb_idx < msg_ps->invb.count))
\r
605 struct mib_node *mn;
\r
606 struct snmp_name_ptr np;
\r
608 if (msg_ps->vb_idx == 0)
\r
610 msg_ps->vb_ptr = msg_ps->invb.head;
\r
614 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
\r
616 /** test object identifier for .iso.org.dod.internet prefix */
\r
617 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
\r
619 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
\r
620 msg_ps->vb_ptr->ident + 4, &np);
\r
623 if (mn->node_type == MIB_NODE_EX)
\r
625 /* external object */
\r
626 struct mib_external_node *en = (struct mib_external_node*)mn;
\r
628 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
\r
629 /* save en && args in msg_ps!! */
\r
630 msg_ps->ext_mib_node = en;
\r
631 msg_ps->ext_name_ptr = np;
\r
633 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
\r
637 /* internal object */
\r
638 struct obj_def object_def;
\r
640 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
\r
641 mn->get_object_def(np.ident_len, np.ident, &object_def);
\r
642 if (object_def.instance != MIB_OBJECT_NONE)
\r
648 /* search failed, object id points to unknown object (nosuchname) */
\r
653 msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST;
\r
655 if (object_def.access == MIB_OBJECT_READ_WRITE)
\r
657 if ((object_def.asn_type == msg_ps->vb_ptr->value_type) &&
\r
658 (mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
\r
660 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
\r
661 msg_ps->vb_idx += 1;
\r
666 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
\r
671 /* object not available for set */
\r
672 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
684 /* mn == NULL, noSuchName */
\r
685 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
689 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
\r
690 (msg_ps->vb_idx == msg_ps->invb.count))
\r
692 msg_ps->vb_idx = 0;
\r
693 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
\r
696 /* set all values "atomically" (be as "atomic" as possible) */
\r
697 while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
\r
698 (msg_ps->vb_idx < msg_ps->invb.count))
\r
700 struct mib_node *mn;
\r
701 struct snmp_name_ptr np;
\r
703 if (msg_ps->vb_idx == 0)
\r
705 msg_ps->vb_ptr = msg_ps->invb.head;
\r
709 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
\r
711 /* skip iso prefix test, was done previously while settesting() */
\r
712 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
\r
713 msg_ps->vb_ptr->ident + 4, &np);
\r
714 /* check if object is still available
\r
715 (e.g. external hot-plug thingy present?) */
\r
718 if (mn->node_type == MIB_NODE_EX)
\r
720 /* external object */
\r
721 struct mib_external_node *en = (struct mib_external_node*)mn;
\r
723 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S;
\r
724 /* save en && args in msg_ps!! */
\r
725 msg_ps->ext_mib_node = en;
\r
726 msg_ps->ext_name_ptr = np;
\r
728 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
\r
732 /* internal object */
\r
733 struct obj_def object_def;
\r
735 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S;
\r
736 mn->get_object_def(np.ident_len, np.ident, &object_def);
\r
737 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
\r
738 mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
\r
739 msg_ps->vb_idx += 1;
\r
743 if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
\r
744 (msg_ps->vb_idx == msg_ps->invb.count))
\r
746 /* simply echo the input if we can set it
\r
747 @todo do we need to return the actual value?
\r
748 e.g. if value is silently modified or behaves sticky? */
\r
749 msg_ps->outvb = msg_ps->invb;
\r
750 msg_ps->invb.head = NULL;
\r
751 msg_ps->invb.tail = NULL;
\r
752 msg_ps->invb.count = 0;
\r
753 snmp_ok_response(msg_ps);
\r
759 * Handle one internal or external event.
\r
760 * Called for one async event. (recv external/private answer)
\r
762 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
\r
765 snmp_msg_event(u8_t request_id)
\r
767 struct snmp_msg_pstat *msg_ps;
\r
769 if (request_id < SNMP_CONCURRENT_REQUESTS)
\r
771 msg_ps = &msg_input_list[request_id];
\r
772 if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ)
\r
774 snmp_msg_getnext_event(request_id, msg_ps);
\r
776 else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ)
\r
778 snmp_msg_get_event(request_id, msg_ps);
\r
780 else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)
\r
782 snmp_msg_set_event(request_id, msg_ps);
\r
788 /* lwIP UDP receive callback function */
\r
790 snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port)
\r
792 struct udp_hdr *udphdr;
\r
794 /* suppress unused argument warning */
\r
795 LWIP_UNUSED_ARG(arg);
\r
796 /* peek in the UDP header (goto IP payload) */
\r
797 if(pbuf_header(p, UDP_HLEN)){
\r
798 LWIP_ASSERT("Can't move to UDP header", 0);
\r
802 udphdr = p->payload;
\r
804 /* check if datagram is really directed at us (including broadcast requests) */
\r
805 if ((pcb == snmp1_pcb) && (ntohs(udphdr->dest) == SNMP_IN_PORT))
\r
807 struct snmp_msg_pstat *msg_ps;
\r
810 /* traverse input message process list, look for SNMP_MSG_EMPTY */
\r
811 msg_ps = &msg_input_list[0];
\r
813 while ((req_idx<SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY))
\r
818 if (req_idx != SNMP_CONCURRENT_REQUESTS)
\r
823 u16_t varbind_ofs = 0;
\r
825 /* accepting request */
\r
826 snmp_inc_snmpinpkts();
\r
827 /* record used 'protocol control block' */
\r
829 /* source address (network order) */
\r
830 msg_ps->sip = *addr;
\r
831 /* source port (host order (lwIP oddity)) */
\r
833 /* read UDP payload length from UDP header */
\r
834 payload_len = ntohs(udphdr->len) - UDP_HLEN;
\r
836 /* adjust to UDP payload */
\r
837 payload_ofs = UDP_HLEN;
\r
839 /* check total length, version, community, pdu type */
\r
840 err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
\r
841 if (((msg_ps->rt == SNMP_ASN1_PDU_GET_REQ) ||
\r
842 (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ) ||
\r
843 (msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)) &&
\r
844 ((msg_ps->error_status == SNMP_ES_NOERROR) &&
\r
845 (msg_ps->error_index == 0)) )
\r
847 /* Only accept requests and requests without error (be robust) */
\r
852 /* Reject response and trap headers or error requests as input! */
\r
855 if (err_ret == ERR_OK)
\r
857 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
\r
859 /* Builds a list of variable bindings. Copy the varbinds from the pbuf
\r
860 chain to glue them when these are divided over two or more pbuf's. */
\r
861 err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
\r
862 if ((err_ret == ERR_OK) && (msg_ps->invb.count > 0))
\r
864 /* we've decoded the incoming message, release input msg now */
\r
867 msg_ps->error_status = SNMP_ES_NOERROR;
\r
868 msg_ps->error_index = 0;
\r
869 /* find object for each variable binding */
\r
870 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
\r
871 /* first variable binding from list to inspect */
\r
872 msg_ps->vb_idx = 0;
\r
874 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
\r
876 /* handle input event and as much objects as possible in one go */
\r
877 snmp_msg_event(req_idx);
\r
881 /* varbind-list decode failed, or varbind list empty.
\r
882 drop request silently, do not return error!
\r
883 (errors are only returned for a specific varbind failure) */
\r
885 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
\r
890 /* header check failed
\r
891 drop request silently, do not return error! */
\r
893 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
\r
898 /* exceeding number of concurrent requests */
\r
904 /* datagram not for us */
\r
910 * Checks and decodes incoming SNMP message header, logs header errors.
\r
912 * @param p points to pbuf chain of SNMP message (UDP payload)
\r
913 * @param ofs points to first octet of SNMP message
\r
914 * @param pdu_len the length of the UDP payload
\r
915 * @param ofs_ret returns the ofset of the variable bindings
\r
916 * @param m_stat points to the current message request state return
\r
918 * - ERR_OK SNMP header is sane and accepted
\r
919 * - ERR_ARG SNMP header is either malformed or rejected
\r
922 snmp_pdu_header_check(struct pbuf *p, u16_t ofs, u16_t pdu_len, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
\r
925 u16_t len, ofs_base;
\r
931 snmp_asn1_dec_type(p, ofs, &type);
\r
932 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
933 if ((derr != ERR_OK) ||
\r
934 (pdu_len != (1 + len_octets + len)) ||
\r
935 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
\r
937 snmp_inc_snmpinasnparseerrs();
\r
940 ofs += (1 + len_octets);
\r
941 snmp_asn1_dec_type(p, ofs, &type);
\r
942 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
943 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
945 /* can't decode or no integer (version) */
\r
946 snmp_inc_snmpinasnparseerrs();
\r
949 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version);
\r
950 if (derr != ERR_OK)
\r
953 snmp_inc_snmpinasnparseerrs();
\r
958 /* not version 1 */
\r
959 snmp_inc_snmpinbadversions();
\r
962 ofs += (1 + len_octets + len);
\r
963 snmp_asn1_dec_type(p, ofs, &type);
\r
964 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
965 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)))
\r
967 /* can't decode or no octet string (community) */
\r
968 snmp_inc_snmpinasnparseerrs();
\r
971 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community);
\r
972 if (derr != ERR_OK)
\r
974 snmp_inc_snmpinasnparseerrs();
\r
977 /* add zero terminator */
\r
978 len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN));
\r
979 m_stat->community[len] = 0;
\r
980 m_stat->com_strlen = len;
\r
981 if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0)
\r
983 /** @todo: move this if we need to check more names */
\r
984 snmp_inc_snmpinbadcommunitynames();
\r
985 snmp_authfail_trap();
\r
988 ofs += (1 + len_octets + len);
\r
989 snmp_asn1_dec_type(p, ofs, &type);
\r
990 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
991 if (derr != ERR_OK)
\r
993 snmp_inc_snmpinasnparseerrs();
\r
998 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ):
\r
999 /* GetRequest PDU */
\r
1000 snmp_inc_snmpingetrequests();
\r
1003 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ):
\r
1004 /* GetNextRequest PDU */
\r
1005 snmp_inc_snmpingetnexts();
\r
1008 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP):
\r
1009 /* GetResponse PDU */
\r
1010 snmp_inc_snmpingetresponses();
\r
1013 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ):
\r
1014 /* SetRequest PDU */
\r
1015 snmp_inc_snmpinsetrequests();
\r
1018 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP):
\r
1020 snmp_inc_snmpintraps();
\r
1024 snmp_inc_snmpinasnparseerrs();
\r
1028 if (derr != ERR_OK)
\r
1030 /* unsupported input PDU for this agent (no parse error) */
\r
1033 m_stat->rt = type & 0x1F;
\r
1034 ofs += (1 + len_octets);
\r
1035 if (len != (pdu_len - (ofs - ofs_base)))
\r
1037 /* decoded PDU length does not equal actual payload length */
\r
1038 snmp_inc_snmpinasnparseerrs();
\r
1041 snmp_asn1_dec_type(p, ofs, &type);
\r
1042 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1043 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
1045 /* can't decode or no integer (request ID) */
\r
1046 snmp_inc_snmpinasnparseerrs();
\r
1049 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid);
\r
1050 if (derr != ERR_OK)
\r
1052 /* can't decode */
\r
1053 snmp_inc_snmpinasnparseerrs();
\r
1056 ofs += (1 + len_octets + len);
\r
1057 snmp_asn1_dec_type(p, ofs, &type);
\r
1058 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1059 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
1061 /* can't decode or no integer (error-status) */
\r
1062 snmp_inc_snmpinasnparseerrs();
\r
1065 /* must be noError (0) for incoming requests.
\r
1066 log errors for mib-2 completeness and for debug purposes */
\r
1067 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status);
\r
1068 if (derr != ERR_OK)
\r
1070 /* can't decode */
\r
1071 snmp_inc_snmpinasnparseerrs();
\r
1074 switch (m_stat->error_status)
\r
1076 case SNMP_ES_TOOBIG:
\r
1077 snmp_inc_snmpintoobigs();
\r
1079 case SNMP_ES_NOSUCHNAME:
\r
1080 snmp_inc_snmpinnosuchnames();
\r
1082 case SNMP_ES_BADVALUE:
\r
1083 snmp_inc_snmpinbadvalues();
\r
1085 case SNMP_ES_READONLY:
\r
1086 snmp_inc_snmpinreadonlys();
\r
1088 case SNMP_ES_GENERROR:
\r
1089 snmp_inc_snmpingenerrs();
\r
1092 ofs += (1 + len_octets + len);
\r
1093 snmp_asn1_dec_type(p, ofs, &type);
\r
1094 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1095 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
1097 /* can't decode or no integer (error-index) */
\r
1098 snmp_inc_snmpinasnparseerrs();
\r
1101 /* must be 0 for incoming requests.
\r
1102 decode anyway to catch bad integers (and dirty tricks) */
\r
1103 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index);
\r
1104 if (derr != ERR_OK)
\r
1106 /* can't decode */
\r
1107 snmp_inc_snmpinasnparseerrs();
\r
1110 ofs += (1 + len_octets + len);
\r
1116 snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
\r
1119 u16_t len, vb_len;
\r
1123 /* variable binding list */
\r
1124 snmp_asn1_dec_type(p, ofs, &type);
\r
1125 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len);
\r
1126 if ((derr != ERR_OK) ||
\r
1127 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
\r
1129 snmp_inc_snmpinasnparseerrs();
\r
1132 ofs += (1 + len_octets);
\r
1134 /* start with empty list */
\r
1135 m_stat->invb.count = 0;
\r
1136 m_stat->invb.head = NULL;
\r
1137 m_stat->invb.tail = NULL;
\r
1139 while (vb_len > 0)
\r
1141 struct snmp_obj_id oid, oid_value;
\r
1142 struct snmp_varbind *vb;
\r
1144 snmp_asn1_dec_type(p, ofs, &type);
\r
1145 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1146 if ((derr != ERR_OK) ||
\r
1147 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) ||
\r
1148 (len <= 0) || (len > vb_len))
\r
1150 snmp_inc_snmpinasnparseerrs();
\r
1151 /* free varbinds (if available) */
\r
1152 snmp_varbind_list_free(&m_stat->invb);
\r
1155 ofs += (1 + len_octets);
\r
1156 vb_len -= (1 + len_octets);
\r
1158 snmp_asn1_dec_type(p, ofs, &type);
\r
1159 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1160 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)))
\r
1162 /* can't decode object name length */
\r
1163 snmp_inc_snmpinasnparseerrs();
\r
1164 /* free varbinds (if available) */
\r
1165 snmp_varbind_list_free(&m_stat->invb);
\r
1168 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid);
\r
1169 if (derr != ERR_OK)
\r
1171 /* can't decode object name */
\r
1172 snmp_inc_snmpinasnparseerrs();
\r
1173 /* free varbinds (if available) */
\r
1174 snmp_varbind_list_free(&m_stat->invb);
\r
1177 ofs += (1 + len_octets + len);
\r
1178 vb_len -= (1 + len_octets + len);
\r
1180 snmp_asn1_dec_type(p, ofs, &type);
\r
1181 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1182 if (derr != ERR_OK)
\r
1184 /* can't decode object value length */
\r
1185 snmp_inc_snmpinasnparseerrs();
\r
1186 /* free varbinds (if available) */
\r
1187 snmp_varbind_list_free(&m_stat->invb);
\r
1193 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
\r
1194 vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t));
\r
1197 s32_t *vptr = vb->value;
\r
1199 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr);
\r
1200 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1207 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
\r
1208 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
\r
1209 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
\r
1210 vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t));
\r
1213 u32_t *vptr = vb->value;
\r
1215 derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr);
\r
1216 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1223 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
\r
1224 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
\r
1225 vb = snmp_varbind_alloc(&oid, type, len);
\r
1228 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, vb->value);
\r
1229 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1236 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
\r
1237 vb = snmp_varbind_alloc(&oid, type, 0);
\r
1240 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1248 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
\r
1249 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value);
\r
1250 if (derr == ERR_OK)
\r
1252 vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t));
\r
1255 u8_t i = oid_value.len;
\r
1256 s32_t *vptr = vb->value;
\r
1261 vptr[i] = oid_value.id[i];
\r
1263 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1272 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
\r
1275 /* must be exactly 4 octets! */
\r
1276 vb = snmp_varbind_alloc(&oid, type, 4);
\r
1279 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, vb->value);
\r
1280 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1296 if (derr != ERR_OK)
\r
1298 snmp_inc_snmpinasnparseerrs();
\r
1299 /* free varbinds (if available) */
\r
1300 snmp_varbind_list_free(&m_stat->invb);
\r
1303 ofs += (1 + len_octets + len);
\r
1304 vb_len -= (1 + len_octets + len);
\r
1307 if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ)
\r
1309 snmp_add_snmpintotalsetvars(m_stat->invb.count);
\r
1313 snmp_add_snmpintotalreqvars(m_stat->invb.count);
\r
1320 struct snmp_varbind*
\r
1321 snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
\r
1323 struct snmp_varbind *vb;
\r
1325 vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind));
\r
1326 LWIP_ASSERT("vb != NULL",vb != NULL);
\r
1334 vb->ident_len = i;
\r
1337 /* allocate array of s32_t for our object identifier */
\r
1338 vb->ident = (s32_t*)mem_malloc(sizeof(s32_t) * i);
\r
1339 LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL);
\r
1340 if (vb->ident == NULL)
\r
1348 vb->ident[i] = oid->id[i];
\r
1353 /* i == 0, pass zero length object identifier */
\r
1356 vb->value_type = type;
\r
1357 vb->value_len = len;
\r
1360 /* allocate raw bytes for our object value */
\r
1361 vb->value = mem_malloc(len);
\r
1362 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
\r
1363 if (vb->value == NULL)
\r
1365 if (vb->ident != NULL)
\r
1367 mem_free(vb->ident);
\r
1375 /* ASN1_NUL type, or zero length ASN1_OC_STR */
\r
1383 snmp_varbind_free(struct snmp_varbind *vb)
\r
1385 if (vb->value != NULL )
\r
1387 mem_free(vb->value);
\r
1389 if (vb->ident != NULL )
\r
1391 mem_free(vb->ident);
\r
1397 snmp_varbind_list_free(struct snmp_varbind_root *root)
\r
1399 struct snmp_varbind *vb, *prev;
\r
1402 while ( vb != NULL )
\r
1405 snmp_varbind_free(vb);
\r
1409 root->head = NULL;
\r
1410 root->tail = NULL;
\r
1414 snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb)
\r
1416 if (root->count == 0)
\r
1418 /* add first varbind to list */
\r
1424 /* add nth varbind to list tail */
\r
1425 root->tail->next = vb;
\r
1426 vb->prev = root->tail;
\r
1432 struct snmp_varbind*
\r
1433 snmp_varbind_tail_remove(struct snmp_varbind_root *root)
\r
1435 struct snmp_varbind* vb;
\r
1437 if (root->count > 0)
\r
1439 /* remove tail varbind */
\r
1441 root->tail = vb->prev;
\r
1442 vb->prev->next = NULL;
\r
1447 /* nothing to remove */
\r
1453 #endif /* LWIP_SNMP */
\r