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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39 #include "arch/cc.h"
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40 #include "lwip/ip_addr.h"
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41 #include "lwip/mem.h"
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42 #include "lwip/udp.h"
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43 #include "lwip/stats.h"
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45 #include "lwip/snmp.h"
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46 #include "lwip/snmp_asn1.h"
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47 #include "lwip/snmp_msg.h"
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48 #include "lwip/snmp_structs.h"
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51 /* public (non-static) constants */
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53 const s32_t snmp_version = 0;
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54 /** default SNMP community string */
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55 const char snmp_publiccommunity[7] = "public";
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57 /* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */
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58 #if (SNMP_CONCURRENT_REQUESTS == 0)
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59 #error "need at least one snmp_msg_pstat"
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61 struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS];
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62 /* UDP Protocol Control Block */
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63 struct udp_pcb *snmp1_pcb = NULL;
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65 static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port);
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66 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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67 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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71 * Starts SNMP Agent.
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72 * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161.
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77 struct snmp_msg_pstat *msg_ps;
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80 snmp1_pcb = udp_new();
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81 if (snmp1_pcb != NULL)
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83 udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT);
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84 udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT);
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86 msg_ps = &msg_input_list[0];
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87 for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++)
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89 msg_ps->state = SNMP_MSG_EMPTY;
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90 msg_ps->error_index = 0;
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91 msg_ps->error_status = SNMP_ES_NOERROR;
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94 trap_msg.pcb = snmp1_pcb;
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95 /* The coldstart trap will only be output
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96 if our outgoing interface is up & configured */
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97 snmp_coldstart_trap();
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101 snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
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103 snmp_varbind_list_free(&msg_ps->outvb);
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104 msg_ps->outvb = msg_ps->invb;
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105 msg_ps->invb.head = NULL;
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106 msg_ps->invb.tail = NULL;
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107 msg_ps->invb.count = 0;
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108 msg_ps->error_status = error;
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109 msg_ps->error_index = 1 + msg_ps->vb_idx;
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110 snmp_send_response(msg_ps);
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111 snmp_varbind_list_free(&msg_ps->outvb);
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112 msg_ps->state = SNMP_MSG_EMPTY;
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116 snmp_ok_response(struct snmp_msg_pstat *msg_ps)
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120 err_ret = snmp_send_response(msg_ps);
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121 if (err_ret == ERR_MEM)
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123 /* serious memory problem, can't return tooBig */
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125 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event pbufs.used = %"U16_F"\n",lwip_stats.pbuf.used));
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130 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status));
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132 /* free varbinds (if available) */
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133 snmp_varbind_list_free(&msg_ps->invb);
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134 snmp_varbind_list_free(&msg_ps->outvb);
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135 msg_ps->state = SNMP_MSG_EMPTY;
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139 * Service an internal or external event for SNMP GET.
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141 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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142 * @param msg_ps points to the assosicated message process state
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145 snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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147 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
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149 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
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151 struct mib_external_node *en;
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152 struct snmp_name_ptr np;
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154 /* get_object_def() answer*/
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155 en = msg_ps->ext_mib_node;
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156 np = msg_ps->ext_name_ptr;
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158 /* translate answer into a known lifeform */
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159 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
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160 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
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162 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
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163 en->get_value_q(request_id, &msg_ps->ext_object_def);
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167 en->get_object_def_pc(request_id, np.ident_len, np.ident);
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168 /* search failed, object id points to unknown object (nosuchname) */
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169 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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172 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
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174 struct mib_external_node *en;
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175 struct snmp_varbind *vb;
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177 /* get_value() answer */
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178 en = msg_ps->ext_mib_node;
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180 /* allocate output varbind */
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181 vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind));
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182 LWIP_ASSERT("vb != NULL",vb != NULL);
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188 /* move name from invb to outvb */
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189 vb->ident = msg_ps->vb_ptr->ident;
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190 vb->ident_len = msg_ps->vb_ptr->ident_len;
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191 /* ensure this memory is refereced once only */
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192 msg_ps->vb_ptr->ident = NULL;
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193 msg_ps->vb_ptr->ident_len = 0;
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195 vb->value_type = msg_ps->ext_object_def.asn_type;
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196 vb->value_len = msg_ps->ext_object_def.v_len;
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197 if (vb->value_len > 0)
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199 vb->value = mem_malloc(vb->value_len);
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200 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
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201 if (vb->value != NULL)
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203 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
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204 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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205 /* search again (if vb_idx < msg_ps->invb.count) */
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206 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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207 msg_ps->vb_idx += 1;
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211 en->get_value_pc(request_id, &msg_ps->ext_object_def);
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212 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n"));
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213 msg_ps->vb_ptr->ident = vb->ident;
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214 msg_ps->vb_ptr->ident_len = vb->ident_len;
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216 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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221 /* vb->value_len == 0, empty value (e.g. empty string) */
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222 en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
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224 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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225 /* search again (if vb_idx < msg_ps->invb.count) */
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226 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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227 msg_ps->vb_idx += 1;
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232 en->get_value_pc(request_id, &msg_ps->ext_object_def);
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233 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n"));
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234 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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238 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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239 (msg_ps->vb_idx < msg_ps->invb.count))
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241 struct mib_node *mn;
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242 struct snmp_name_ptr np;
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244 if (msg_ps->vb_idx == 0)
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246 msg_ps->vb_ptr = msg_ps->invb.head;
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250 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
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252 /** test object identifier for .iso.org.dod.internet prefix */
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253 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
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255 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
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256 msg_ps->vb_ptr->ident + 4, &np);
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264 if (mn->node_type == MIB_NODE_EX)
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266 /* external object */
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267 struct mib_external_node *en = (struct mib_external_node*)mn;
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269 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
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270 /* save en && args in msg_ps!! */
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271 msg_ps->ext_mib_node = en;
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272 msg_ps->ext_name_ptr = np;
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274 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
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278 /* internal object */
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279 struct obj_def object_def;
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281 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
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282 mn->get_object_def(np.ident_len, np.ident, &object_def);
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283 if (object_def.instance != MIB_OBJECT_NONE)
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289 /* search failed, object id points to unknown object (nosuchname) */
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294 struct snmp_varbind *vb;
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296 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
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297 /* allocate output varbind */
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298 vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind));
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299 LWIP_ASSERT("vb != NULL",vb != NULL);
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305 /* move name from invb to outvb */
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306 vb->ident = msg_ps->vb_ptr->ident;
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307 vb->ident_len = msg_ps->vb_ptr->ident_len;
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308 /* ensure this memory is refereced once only */
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309 msg_ps->vb_ptr->ident = NULL;
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310 msg_ps->vb_ptr->ident_len = 0;
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312 vb->value_type = object_def.asn_type;
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313 vb->value_len = object_def.v_len;
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314 if (vb->value_len > 0)
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316 vb->value = mem_malloc(vb->value_len);
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317 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
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318 if (vb->value != NULL)
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320 mn->get_value(&object_def, vb->value_len, vb->value);
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321 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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322 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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323 msg_ps->vb_idx += 1;
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327 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
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328 msg_ps->vb_ptr->ident = vb->ident;
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329 msg_ps->vb_ptr->ident_len = vb->ident_len;
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331 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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336 /* vb->value_len == 0, empty value (e.g. empty string) */
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338 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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339 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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340 msg_ps->vb_idx += 1;
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345 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n"));
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346 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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353 /* mn == NULL, noSuchName */
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354 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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357 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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358 (msg_ps->vb_idx == msg_ps->invb.count))
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360 snmp_ok_response(msg_ps);
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365 * Service an internal or external event for SNMP GETNEXT.
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367 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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368 * @param msg_ps points to the assosicated message process state
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371 snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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373 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
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375 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
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377 struct mib_external_node *en;
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379 /* get_object_def() answer*/
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380 en = msg_ps->ext_mib_node;
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382 /* translate answer into a known lifeform */
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383 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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384 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
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386 msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE;
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387 en->get_value_q(request_id, &msg_ps->ext_object_def);
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391 en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]);
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392 /* search failed, object id points to unknown object (nosuchname) */
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393 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
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396 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE)
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398 struct mib_external_node *en;
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399 struct snmp_varbind *vb;
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401 /* get_value() answer */
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402 en = msg_ps->ext_mib_node;
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404 vb = snmp_varbind_alloc(&msg_ps->ext_oid,
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405 msg_ps->ext_object_def.asn_type,
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406 msg_ps->ext_object_def.v_len);
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409 en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
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410 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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411 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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412 msg_ps->vb_idx += 1;
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416 en->get_value_pc(request_id, &msg_ps->ext_object_def);
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417 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n"));
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418 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
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422 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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423 (msg_ps->vb_idx < msg_ps->invb.count))
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425 struct mib_node *mn;
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426 struct snmp_obj_id oid;
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428 if (msg_ps->vb_idx == 0)
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430 msg_ps->vb_ptr = msg_ps->invb.head;
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434 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
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436 if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid))
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438 if (msg_ps->vb_ptr->ident_len > 3)
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440 /* can offset ident_len and ident */
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441 mn = snmp_expand_tree((struct mib_node*)&internet,
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442 msg_ps->vb_ptr->ident_len - 4,
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443 msg_ps->vb_ptr->ident + 4, &oid);
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447 /* can't offset ident_len -4, ident + 4 */
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448 mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid);
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457 if (mn->node_type == MIB_NODE_EX)
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459 /* external object */
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460 struct mib_external_node *en = (struct mib_external_node*)mn;
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462 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
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463 /* save en && args in msg_ps!! */
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464 msg_ps->ext_mib_node = en;
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465 msg_ps->ext_oid = oid;
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467 en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]);
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471 /* internal object */
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472 struct obj_def object_def;
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473 struct snmp_varbind *vb;
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475 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
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476 mn->get_object_def(1, &oid.id[oid.len - 1], &object_def);
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478 vb = snmp_varbind_alloc(&oid, object_def.asn_type, object_def.v_len);
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481 msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
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482 mn->get_value(&object_def, object_def.v_len, vb->value);
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483 snmp_varbind_tail_add(&msg_ps->outvb, vb);
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484 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
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485 msg_ps->vb_idx += 1;
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489 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n"));
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490 snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
\r
496 /* mn == NULL, noSuchName */
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497 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
500 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
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501 (msg_ps->vb_idx == msg_ps->invb.count))
\r
503 snmp_ok_response(msg_ps);
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508 * Service an internal or external event for SNMP SET.
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510 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
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511 * @param msg_ps points to the assosicated message process state
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514 snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
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516 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state));
\r
518 if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF)
\r
520 struct mib_external_node *en;
\r
521 struct snmp_name_ptr np;
\r
523 /* get_object_def() answer*/
\r
524 en = msg_ps->ext_mib_node;
\r
525 np = msg_ps->ext_name_ptr;
\r
527 /* translate answer into a known lifeform */
\r
528 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
\r
529 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
\r
531 msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST;
\r
532 en->set_test_q(request_id, &msg_ps->ext_object_def);
\r
536 en->get_object_def_pc(request_id, np.ident_len, np.ident);
\r
537 /* search failed, object id points to unknown object (nosuchname) */
\r
538 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
541 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST)
\r
543 struct mib_external_node *en;
\r
544 struct snmp_name_ptr np;
\r
546 /* set_test() answer*/
\r
547 en = msg_ps->ext_mib_node;
\r
548 np = msg_ps->ext_name_ptr;
\r
550 if (msg_ps->ext_object_def.access == MIB_OBJECT_READ_WRITE)
\r
552 if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) &&
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553 (en->set_test_a(request_id,&msg_ps->ext_object_def,
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554 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
\r
556 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
\r
557 msg_ps->vb_idx += 1;
\r
561 en->set_test_pc(request_id,&msg_ps->ext_object_def);
\r
563 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
\r
568 en->set_test_pc(request_id,&msg_ps->ext_object_def);
\r
569 /* object not available for set */
\r
570 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
573 else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S)
\r
575 struct mib_external_node *en;
\r
576 struct snmp_name_ptr np;
\r
578 /* get_object_def() answer*/
\r
579 en = msg_ps->ext_mib_node;
\r
580 np = msg_ps->ext_name_ptr;
\r
582 /* translate answer into a known lifeform */
\r
583 en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def);
\r
584 if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE)
\r
586 msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE;
\r
587 en->set_value_q(request_id, &msg_ps->ext_object_def,
\r
588 msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
\r
592 en->get_object_def_pc(request_id, np.ident_len, np.ident);
\r
593 /* set_value failed, object has disappeared for some odd reason?? */
\r
594 snmp_error_response(msg_ps,SNMP_ES_GENERROR);
\r
597 else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE)
\r
599 struct mib_external_node *en;
\r
601 /** set_value_a() @todo: use reply value?? */
\r
602 en = msg_ps->ext_mib_node;
\r
603 en->set_value_a(request_id, &msg_ps->ext_object_def, 0, NULL);
\r
605 /** @todo use set_value_pc() if toobig */
\r
606 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
\r
607 msg_ps->vb_idx += 1;
\r
610 /* test all values before setting */
\r
611 while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
\r
612 (msg_ps->vb_idx < msg_ps->invb.count))
\r
614 struct mib_node *mn;
\r
615 struct snmp_name_ptr np;
\r
617 if (msg_ps->vb_idx == 0)
\r
619 msg_ps->vb_ptr = msg_ps->invb.head;
\r
623 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
\r
625 /** test object identifier for .iso.org.dod.internet prefix */
\r
626 if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident))
\r
628 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
\r
629 msg_ps->vb_ptr->ident + 4, &np);
\r
637 if (mn->node_type == MIB_NODE_EX)
\r
639 /* external object */
\r
640 struct mib_external_node *en = (struct mib_external_node*)mn;
\r
642 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF;
\r
643 /* save en && args in msg_ps!! */
\r
644 msg_ps->ext_mib_node = en;
\r
645 msg_ps->ext_name_ptr = np;
\r
647 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
\r
651 /* internal object */
\r
652 struct obj_def object_def;
\r
654 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF;
\r
655 mn->get_object_def(np.ident_len, np.ident, &object_def);
\r
656 if (object_def.instance != MIB_OBJECT_NONE)
\r
662 /* search failed, object id points to unknown object (nosuchname) */
\r
667 msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST;
\r
669 if (object_def.access == MIB_OBJECT_READ_WRITE)
\r
671 if ((object_def.asn_type == msg_ps->vb_ptr->value_type) &&
\r
672 (mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0))
\r
674 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
\r
675 msg_ps->vb_idx += 1;
\r
680 snmp_error_response(msg_ps,SNMP_ES_BADVALUE);
\r
685 /* object not available for set */
\r
686 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
693 /* mn == NULL, noSuchName */
\r
694 snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME);
\r
698 if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) &&
\r
699 (msg_ps->vb_idx == msg_ps->invb.count))
\r
701 msg_ps->vb_idx = 0;
\r
702 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
\r
705 /* set all values "atomically" (be as "atomic" as possible) */
\r
706 while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
\r
707 (msg_ps->vb_idx < msg_ps->invb.count))
\r
709 struct mib_node *mn;
\r
710 struct snmp_name_ptr np;
\r
712 if (msg_ps->vb_idx == 0)
\r
714 msg_ps->vb_ptr = msg_ps->invb.head;
\r
718 msg_ps->vb_ptr = msg_ps->vb_ptr->next;
\r
720 /* skip iso prefix test, was done previously while settesting() */
\r
721 mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4,
\r
722 msg_ps->vb_ptr->ident + 4, &np);
\r
723 /* check if object is still available
\r
724 (e.g. external hot-plug thingy present?) */
\r
727 if (mn->node_type == MIB_NODE_EX)
\r
729 /* external object */
\r
730 struct mib_external_node *en = (struct mib_external_node*)mn;
\r
732 msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S;
\r
733 /* save en && args in msg_ps!! */
\r
734 msg_ps->ext_mib_node = en;
\r
735 msg_ps->ext_name_ptr = np;
\r
737 en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident);
\r
741 /* internal object */
\r
742 struct obj_def object_def;
\r
744 msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S;
\r
745 mn->get_object_def(np.ident_len, np.ident, &object_def);
\r
746 msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE;
\r
747 mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value);
\r
748 msg_ps->vb_idx += 1;
\r
752 if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) &&
\r
753 (msg_ps->vb_idx == msg_ps->invb.count))
\r
755 /* simply echo the input if we can set it
\r
756 @todo do we need to return the actual value?
\r
757 e.g. if value is silently modified or behaves sticky? */
\r
758 msg_ps->outvb = msg_ps->invb;
\r
759 msg_ps->invb.head = NULL;
\r
760 msg_ps->invb.tail = NULL;
\r
761 msg_ps->invb.count = 0;
\r
762 snmp_ok_response(msg_ps);
\r
768 * Handle one internal or external event.
\r
769 * Called for one async event. (recv external/private answer)
\r
771 * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1)
\r
774 snmp_msg_event(u8_t request_id)
\r
776 struct snmp_msg_pstat *msg_ps;
\r
778 if (request_id < SNMP_CONCURRENT_REQUESTS)
\r
780 msg_ps = &msg_input_list[request_id];
\r
781 if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ)
\r
783 snmp_msg_getnext_event(request_id, msg_ps);
\r
785 else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ)
\r
787 snmp_msg_get_event(request_id, msg_ps);
\r
789 else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)
\r
791 snmp_msg_set_event(request_id, msg_ps);
\r
797 /* lwIP UDP receive callback function */
\r
799 snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port)
\r
801 struct udp_hdr *udphdr;
\r
803 /* suppress unused argument warning */
\r
805 /* peek in the UDP header (goto IP payload) */
\r
806 pbuf_header(p, UDP_HLEN);
\r
807 udphdr = p->payload;
\r
809 /* check if datagram is really directed at us (including broadcast requests) */
\r
810 if ((pcb == snmp1_pcb) && (ntohs(udphdr->dest) == 161))
\r
812 struct snmp_msg_pstat *msg_ps;
\r
815 /* traverse input message process list, look for SNMP_MSG_EMPTY */
\r
816 msg_ps = &msg_input_list[0];
\r
818 while ((req_idx<SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY))
\r
823 if (req_idx != SNMP_CONCURRENT_REQUESTS)
\r
828 u16_t varbind_ofs = 0;
\r
830 /* accepting request */
\r
831 snmp_inc_snmpinpkts();
\r
832 /* record used 'protocol control block' */
\r
834 /* source address (network order) */
\r
835 msg_ps->sip = *addr;
\r
836 /* source port (host order (lwIP oddity)) */
\r
838 /* read UDP payload length from UDP header */
\r
839 payload_len = ntohs(udphdr->len) - UDP_HLEN;
\r
841 /* adjust to UDP payload */
\r
842 payload_ofs = UDP_HLEN;
\r
844 /* check total length, version, community, pdu type */
\r
845 err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
\r
846 if (((msg_ps->rt == SNMP_ASN1_PDU_GET_REQ) ||
\r
847 (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ) ||
\r
848 (msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)) &&
\r
849 ((msg_ps->error_status == SNMP_ES_NOERROR) &&
\r
850 (msg_ps->error_index == 0)) )
\r
852 /* Only accept requests and requests without error (be robust) */
\r
857 /* Reject response and trap headers or error requests as input! */
\r
860 if (err_ret == ERR_OK)
\r
862 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
\r
864 /* Builds a list of variable bindings. Copy the varbinds from the pbuf
\r
865 chain to glue them when these are divided over two or more pbuf's. */
\r
866 err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
\r
867 if ((err_ret == ERR_OK) && (msg_ps->invb.count > 0))
\r
869 /* we've decoded the incoming message, release input msg now */
\r
872 msg_ps->error_status = SNMP_ES_NOERROR;
\r
873 msg_ps->error_index = 0;
\r
874 /* find object for each variable binding */
\r
875 msg_ps->state = SNMP_MSG_SEARCH_OBJ;
\r
876 /* first variable binding from list to inspect */
\r
877 msg_ps->vb_idx = 0;
\r
879 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
\r
881 /* handle input event and as much objects as possible in one go */
\r
882 snmp_msg_event(req_idx);
\r
886 /* varbind-list decode failed, or varbind list empty.
\r
887 drop request silently, do not return error!
\r
888 (errors are only returned for a specific varbind failure) */
\r
890 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
\r
895 /* header check failed
\r
896 drop request silently, do not return error! */
\r
898 LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
\r
903 /* exceeding number of concurrent requests */
\r
909 /* datagram not for us */
\r
915 * Checks and decodes incoming SNMP message header, logs header errors.
\r
917 * @param p points to pbuf chain of SNMP message (UDP payload)
\r
918 * @param ofs points to first octet of SNMP message
\r
919 * @param pdu_len the length of the UDP payload
\r
920 * @param ofs_ret returns the ofset of the variable bindings
\r
921 * @param m_stat points to the current message request state return
\r
923 * - ERR_OK SNMP header is sane and accepted
\r
924 * - ERR_ARG SNMP header is either malformed or rejected
\r
927 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
930 u16_t len, ofs_base;
\r
936 snmp_asn1_dec_type(p, ofs, &type);
\r
937 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
938 if ((derr != ERR_OK) ||
\r
939 (pdu_len != (1 + len_octets + len)) ||
\r
940 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
\r
942 snmp_inc_snmpinasnparseerrs();
\r
945 ofs += (1 + len_octets);
\r
946 snmp_asn1_dec_type(p, ofs, &type);
\r
947 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
948 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
950 /* can't decode or no integer (version) */
\r
951 snmp_inc_snmpinasnparseerrs();
\r
954 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version);
\r
955 if (derr != ERR_OK)
\r
958 snmp_inc_snmpinasnparseerrs();
\r
963 /* not version 1 */
\r
964 snmp_inc_snmpinbadversions();
\r
967 ofs += (1 + len_octets + len);
\r
968 snmp_asn1_dec_type(p, ofs, &type);
\r
969 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
970 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR)))
\r
972 /* can't decode or no octet string (community) */
\r
973 snmp_inc_snmpinasnparseerrs();
\r
976 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community);
\r
977 if (derr != ERR_OK)
\r
979 snmp_inc_snmpinasnparseerrs();
\r
982 /* add zero terminator */
\r
983 len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN));
\r
984 m_stat->community[len] = 0;
\r
985 m_stat->com_strlen = len;
\r
986 if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0)
\r
988 /** @todo: move this if we need to check more names */
\r
989 snmp_inc_snmpinbadcommunitynames();
\r
990 snmp_authfail_trap();
\r
993 ofs += (1 + len_octets + len);
\r
994 snmp_asn1_dec_type(p, ofs, &type);
\r
995 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
996 if (derr != ERR_OK)
\r
998 snmp_inc_snmpinasnparseerrs();
\r
1003 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ):
\r
1004 /* GetRequest PDU */
\r
1005 snmp_inc_snmpingetrequests();
\r
1008 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ):
\r
1009 /* GetNextRequest PDU */
\r
1010 snmp_inc_snmpingetnexts();
\r
1013 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP):
\r
1014 /* GetResponse PDU */
\r
1015 snmp_inc_snmpingetresponses();
\r
1018 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ):
\r
1019 /* SetRequest PDU */
\r
1020 snmp_inc_snmpinsetrequests();
\r
1023 case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP):
\r
1025 snmp_inc_snmpintraps();
\r
1029 snmp_inc_snmpinasnparseerrs();
\r
1033 if (derr != ERR_OK)
\r
1035 /* unsupported input PDU for this agent (no parse error) */
\r
1038 m_stat->rt = type & 0x1F;
\r
1039 ofs += (1 + len_octets);
\r
1040 if (len != (pdu_len - (ofs - ofs_base)))
\r
1042 /* decoded PDU length does not equal actual payload length */
\r
1043 snmp_inc_snmpinasnparseerrs();
\r
1046 snmp_asn1_dec_type(p, ofs, &type);
\r
1047 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1048 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
1050 /* can't decode or no integer (request ID) */
\r
1051 snmp_inc_snmpinasnparseerrs();
\r
1054 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid);
\r
1055 if (derr != ERR_OK)
\r
1057 /* can't decode */
\r
1058 snmp_inc_snmpinasnparseerrs();
\r
1061 ofs += (1 + len_octets + len);
\r
1062 snmp_asn1_dec_type(p, ofs, &type);
\r
1063 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1064 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
1066 /* can't decode or no integer (error-status) */
\r
1067 snmp_inc_snmpinasnparseerrs();
\r
1070 /* must be noError (0) for incoming requests.
\r
1071 log errors for mib-2 completeness and for debug purposes */
\r
1072 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status);
\r
1073 if (derr != ERR_OK)
\r
1075 /* can't decode */
\r
1076 snmp_inc_snmpinasnparseerrs();
\r
1079 switch (m_stat->error_status)
\r
1081 case SNMP_ES_TOOBIG:
\r
1082 snmp_inc_snmpintoobigs();
\r
1084 case SNMP_ES_NOSUCHNAME:
\r
1085 snmp_inc_snmpinnosuchnames();
\r
1087 case SNMP_ES_BADVALUE:
\r
1088 snmp_inc_snmpinbadvalues();
\r
1090 case SNMP_ES_READONLY:
\r
1091 snmp_inc_snmpinreadonlys();
\r
1093 case SNMP_ES_GENERROR:
\r
1094 snmp_inc_snmpingenerrs();
\r
1097 ofs += (1 + len_octets + len);
\r
1098 snmp_asn1_dec_type(p, ofs, &type);
\r
1099 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1100 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG)))
\r
1102 /* can't decode or no integer (error-index) */
\r
1103 snmp_inc_snmpinasnparseerrs();
\r
1106 /* must be 0 for incoming requests.
\r
1107 decode anyway to catch bad integers (and dirty tricks) */
\r
1108 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index);
\r
1109 if (derr != ERR_OK)
\r
1111 /* can't decode */
\r
1112 snmp_inc_snmpinasnparseerrs();
\r
1115 ofs += (1 + len_octets + len);
\r
1121 snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat)
\r
1124 u16_t len, vb_len;
\r
1128 /* variable binding list */
\r
1129 snmp_asn1_dec_type(p, ofs, &type);
\r
1130 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len);
\r
1131 if ((derr != ERR_OK) ||
\r
1132 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)))
\r
1134 snmp_inc_snmpinasnparseerrs();
\r
1137 ofs += (1 + len_octets);
\r
1139 /* start with empty list */
\r
1140 m_stat->invb.count = 0;
\r
1141 m_stat->invb.head = NULL;
\r
1142 m_stat->invb.tail = NULL;
\r
1144 while (vb_len > 0)
\r
1146 struct snmp_obj_id oid, oid_value;
\r
1147 struct snmp_varbind *vb;
\r
1149 snmp_asn1_dec_type(p, ofs, &type);
\r
1150 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1151 if ((derr != ERR_OK) ||
\r
1152 (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) ||
\r
1153 (len <= 0) || (len > vb_len))
\r
1155 snmp_inc_snmpinasnparseerrs();
\r
1156 /* free varbinds (if available) */
\r
1157 snmp_varbind_list_free(&m_stat->invb);
\r
1160 ofs += (1 + len_octets);
\r
1161 vb_len -= (1 + len_octets);
\r
1163 snmp_asn1_dec_type(p, ofs, &type);
\r
1164 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1165 if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID)))
\r
1167 /* can't decode object name length */
\r
1168 snmp_inc_snmpinasnparseerrs();
\r
1169 /* free varbinds (if available) */
\r
1170 snmp_varbind_list_free(&m_stat->invb);
\r
1173 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid);
\r
1174 if (derr != ERR_OK)
\r
1176 /* can't decode object name */
\r
1177 snmp_inc_snmpinasnparseerrs();
\r
1178 /* free varbinds (if available) */
\r
1179 snmp_varbind_list_free(&m_stat->invb);
\r
1182 ofs += (1 + len_octets + len);
\r
1183 vb_len -= (1 + len_octets + len);
\r
1185 snmp_asn1_dec_type(p, ofs, &type);
\r
1186 derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len);
\r
1187 if (derr != ERR_OK)
\r
1189 /* can't decode object value length */
\r
1190 snmp_inc_snmpinasnparseerrs();
\r
1191 /* free varbinds (if available) */
\r
1192 snmp_varbind_list_free(&m_stat->invb);
\r
1198 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
\r
1199 vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t));
\r
1202 s32_t *vptr = vb->value;
\r
1204 derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr);
\r
1205 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1212 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
\r
1213 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
\r
1214 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
\r
1215 vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t));
\r
1218 u32_t *vptr = vb->value;
\r
1220 derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr);
\r
1221 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1228 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
\r
1229 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
\r
1230 vb = snmp_varbind_alloc(&oid, type, len);
\r
1233 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, vb->value);
\r
1234 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1241 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
\r
1242 vb = snmp_varbind_alloc(&oid, type, 0);
\r
1245 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1253 case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
\r
1254 derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value);
\r
1255 if (derr == ERR_OK)
\r
1257 vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t));
\r
1260 u8_t i = oid_value.len;
\r
1261 s32_t *vptr = vb->value;
\r
1266 vptr[i] = oid_value.id[i];
\r
1268 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1277 case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
\r
1280 /* must be exactly 4 octets! */
\r
1281 vb = snmp_varbind_alloc(&oid, type, 4);
\r
1284 derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, vb->value);
\r
1285 snmp_varbind_tail_add(&m_stat->invb, vb);
\r
1301 if (derr != ERR_OK)
\r
1303 snmp_inc_snmpinasnparseerrs();
\r
1304 /* free varbinds (if available) */
\r
1305 snmp_varbind_list_free(&m_stat->invb);
\r
1308 ofs += (1 + len_octets + len);
\r
1309 vb_len -= (1 + len_octets + len);
\r
1312 if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ)
\r
1314 snmp_add_snmpintotalsetvars(m_stat->invb.count);
\r
1318 snmp_add_snmpintotalreqvars(m_stat->invb.count);
\r
1325 struct snmp_varbind*
\r
1326 snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
\r
1328 struct snmp_varbind *vb;
\r
1330 vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind));
\r
1331 LWIP_ASSERT("vb != NULL",vb != NULL);
\r
1339 vb->ident_len = i;
\r
1342 /* allocate array of s32_t for our object identifier */
\r
1343 vb->ident = (s32_t*)mem_malloc(sizeof(s32_t) * i);
\r
1344 LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL);
\r
1345 if (vb->ident == NULL)
\r
1353 vb->ident[i] = oid->id[i];
\r
1358 /* i == 0, pass zero length object identifier */
\r
1361 vb->value_type = type;
\r
1362 vb->value_len = len;
\r
1365 /* allocate raw bytes for our object value */
\r
1366 vb->value = mem_malloc(len);
\r
1367 LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
\r
1368 if (vb->value == NULL)
\r
1370 if (vb->ident != NULL)
\r
1372 mem_free(vb->ident);
\r
1380 /* ASN1_NUL type, or zero length ASN1_OC_STR */
\r
1388 snmp_varbind_free(struct snmp_varbind *vb)
\r
1390 if (vb->value != NULL )
\r
1392 mem_free(vb->value);
\r
1394 if (vb->ident != NULL )
\r
1396 mem_free(vb->ident);
\r
1402 snmp_varbind_list_free(struct snmp_varbind_root *root)
\r
1404 struct snmp_varbind *vb, *prev;
\r
1407 while ( vb != NULL )
\r
1410 snmp_varbind_free(vb);
\r
1414 root->head = NULL;
\r
1415 root->tail = NULL;
\r
1419 snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb)
\r
1421 if (root->count == 0)
\r
1423 /* add first varbind to list */
\r
1429 /* add nth varbind to list tail */
\r
1430 root->tail->next = vb;
\r
1431 vb->prev = root->tail;
\r
1437 struct snmp_varbind*
\r
1438 snmp_varbind_tail_remove(struct snmp_varbind_root *root)
\r
1440 struct snmp_varbind* vb;
\r
1442 if (root->count > 0)
\r
1444 /* remove tail varbind */
\r
1446 root->tail = vb->prev;
\r
1447 vb->prev->next = NULL;
\r
1452 /* nothing to remove */
\r
1458 #endif /* LWIP_SNMP */
\r