My fork of the HTTPServer (working)
Core/lwIP/core/snmp/msg_in.c@1:284f2df30cf9, 2012-11-20 (annotated)
- Committer:
- screamer
- Date:
- Tue Nov 20 12:18:53 2012 +0000
- Revision:
- 1:284f2df30cf9
- Parent:
- 0:7a64fbb4069d
local changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
screamer | 0:7a64fbb4069d | 1 | /** |
screamer | 0:7a64fbb4069d | 2 | * @file |
screamer | 0:7a64fbb4069d | 3 | * SNMP input message processing (RFC1157). |
screamer | 0:7a64fbb4069d | 4 | */ |
screamer | 0:7a64fbb4069d | 5 | |
screamer | 0:7a64fbb4069d | 6 | /* |
screamer | 0:7a64fbb4069d | 7 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands. |
screamer | 0:7a64fbb4069d | 8 | * All rights reserved. |
screamer | 0:7a64fbb4069d | 9 | * |
screamer | 0:7a64fbb4069d | 10 | * Redistribution and use in source and binary forms, with or without modification, |
screamer | 0:7a64fbb4069d | 11 | * are permitted provided that the following conditions are met: |
screamer | 0:7a64fbb4069d | 12 | * |
screamer | 0:7a64fbb4069d | 13 | * 1. Redistributions of source code must retain the above copyright notice, |
screamer | 0:7a64fbb4069d | 14 | * this list of conditions and the following disclaimer. |
screamer | 0:7a64fbb4069d | 15 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
screamer | 0:7a64fbb4069d | 16 | * this list of conditions and the following disclaimer in the documentation |
screamer | 0:7a64fbb4069d | 17 | * and/or other materials provided with the distribution. |
screamer | 0:7a64fbb4069d | 18 | * 3. The name of the author may not be used to endorse or promote products |
screamer | 0:7a64fbb4069d | 19 | * derived from this software without specific prior written permission. |
screamer | 0:7a64fbb4069d | 20 | * |
screamer | 0:7a64fbb4069d | 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
screamer | 0:7a64fbb4069d | 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
screamer | 0:7a64fbb4069d | 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
screamer | 0:7a64fbb4069d | 24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
screamer | 0:7a64fbb4069d | 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
screamer | 0:7a64fbb4069d | 26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
screamer | 0:7a64fbb4069d | 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
screamer | 0:7a64fbb4069d | 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
screamer | 0:7a64fbb4069d | 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
screamer | 0:7a64fbb4069d | 30 | * OF SUCH DAMAGE. |
screamer | 0:7a64fbb4069d | 31 | * |
screamer | 0:7a64fbb4069d | 32 | * Author: Christiaan Simons <christiaan.simons@axon.tv> |
screamer | 0:7a64fbb4069d | 33 | */ |
screamer | 0:7a64fbb4069d | 34 | |
screamer | 0:7a64fbb4069d | 35 | #include "lwip/opt.h" |
screamer | 0:7a64fbb4069d | 36 | |
screamer | 0:7a64fbb4069d | 37 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */ |
screamer | 0:7a64fbb4069d | 38 | |
screamer | 0:7a64fbb4069d | 39 | #include "lwip/ip_addr.h" |
screamer | 0:7a64fbb4069d | 40 | #include "lwip/mem.h" |
screamer | 0:7a64fbb4069d | 41 | #include "lwip/udp.h" |
screamer | 0:7a64fbb4069d | 42 | #include "lwip/stats.h" |
screamer | 0:7a64fbb4069d | 43 | #include "lwip/snmp.h" |
screamer | 0:7a64fbb4069d | 44 | #include "lwip/snmp_asn1.h" |
screamer | 0:7a64fbb4069d | 45 | #include "lwip/snmp_msg.h" |
screamer | 0:7a64fbb4069d | 46 | #include "lwip/snmp_structs.h" |
screamer | 0:7a64fbb4069d | 47 | |
screamer | 0:7a64fbb4069d | 48 | #include <string.h> |
screamer | 0:7a64fbb4069d | 49 | |
screamer | 0:7a64fbb4069d | 50 | /* public (non-static) constants */ |
screamer | 0:7a64fbb4069d | 51 | /** SNMP v1 == 0 */ |
screamer | 0:7a64fbb4069d | 52 | const s32_t snmp_version = 0; |
screamer | 0:7a64fbb4069d | 53 | /** default SNMP community string */ |
screamer | 0:7a64fbb4069d | 54 | const char snmp_publiccommunity[7] = "public"; |
screamer | 0:7a64fbb4069d | 55 | |
screamer | 0:7a64fbb4069d | 56 | /* statically allocated buffers for SNMP_CONCURRENT_REQUESTS */ |
screamer | 0:7a64fbb4069d | 57 | struct snmp_msg_pstat msg_input_list[SNMP_CONCURRENT_REQUESTS]; |
screamer | 0:7a64fbb4069d | 58 | /* UDP Protocol Control Block */ |
screamer | 0:7a64fbb4069d | 59 | struct udp_pcb *snmp1_pcb; |
screamer | 0:7a64fbb4069d | 60 | |
screamer | 0:7a64fbb4069d | 61 | static void snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port); |
screamer | 0:7a64fbb4069d | 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); |
screamer | 0:7a64fbb4069d | 63 | static err_t snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat); |
screamer | 0:7a64fbb4069d | 64 | |
screamer | 0:7a64fbb4069d | 65 | |
screamer | 0:7a64fbb4069d | 66 | /** |
screamer | 0:7a64fbb4069d | 67 | * Starts SNMP Agent. |
screamer | 0:7a64fbb4069d | 68 | * Allocates UDP pcb and binds it to IP_ADDR_ANY port 161. |
screamer | 0:7a64fbb4069d | 69 | */ |
screamer | 0:7a64fbb4069d | 70 | void |
screamer | 0:7a64fbb4069d | 71 | snmp_init(void) |
screamer | 0:7a64fbb4069d | 72 | { |
screamer | 0:7a64fbb4069d | 73 | struct snmp_msg_pstat *msg_ps; |
screamer | 0:7a64fbb4069d | 74 | u8_t i; |
screamer | 0:7a64fbb4069d | 75 | |
screamer | 0:7a64fbb4069d | 76 | snmp1_pcb = udp_new(); |
screamer | 0:7a64fbb4069d | 77 | if (snmp1_pcb != NULL) |
screamer | 0:7a64fbb4069d | 78 | { |
screamer | 0:7a64fbb4069d | 79 | udp_recv(snmp1_pcb, snmp_recv, (void *)SNMP_IN_PORT); |
screamer | 0:7a64fbb4069d | 80 | udp_bind(snmp1_pcb, IP_ADDR_ANY, SNMP_IN_PORT); |
screamer | 0:7a64fbb4069d | 81 | } |
screamer | 0:7a64fbb4069d | 82 | msg_ps = &msg_input_list[0]; |
screamer | 0:7a64fbb4069d | 83 | for (i=0; i<SNMP_CONCURRENT_REQUESTS; i++) |
screamer | 0:7a64fbb4069d | 84 | { |
screamer | 0:7a64fbb4069d | 85 | msg_ps->state = SNMP_MSG_EMPTY; |
screamer | 0:7a64fbb4069d | 86 | msg_ps->error_index = 0; |
screamer | 0:7a64fbb4069d | 87 | msg_ps->error_status = SNMP_ES_NOERROR; |
screamer | 0:7a64fbb4069d | 88 | msg_ps++; |
screamer | 0:7a64fbb4069d | 89 | } |
screamer | 0:7a64fbb4069d | 90 | trap_msg.pcb = snmp1_pcb; |
screamer | 0:7a64fbb4069d | 91 | /* The coldstart trap will only be output |
screamer | 0:7a64fbb4069d | 92 | if our outgoing interface is up & configured */ |
screamer | 0:7a64fbb4069d | 93 | snmp_coldstart_trap(); |
screamer | 0:7a64fbb4069d | 94 | } |
screamer | 0:7a64fbb4069d | 95 | |
screamer | 0:7a64fbb4069d | 96 | static void |
screamer | 0:7a64fbb4069d | 97 | snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error) |
screamer | 0:7a64fbb4069d | 98 | { |
screamer | 0:7a64fbb4069d | 99 | snmp_varbind_list_free(&msg_ps->outvb); |
screamer | 0:7a64fbb4069d | 100 | msg_ps->outvb = msg_ps->invb; |
screamer | 0:7a64fbb4069d | 101 | msg_ps->invb.head = NULL; |
screamer | 0:7a64fbb4069d | 102 | msg_ps->invb.tail = NULL; |
screamer | 0:7a64fbb4069d | 103 | msg_ps->invb.count = 0; |
screamer | 0:7a64fbb4069d | 104 | msg_ps->error_status = error; |
screamer | 0:7a64fbb4069d | 105 | msg_ps->error_index = 1 + msg_ps->vb_idx; |
screamer | 0:7a64fbb4069d | 106 | snmp_send_response(msg_ps); |
screamer | 0:7a64fbb4069d | 107 | snmp_varbind_list_free(&msg_ps->outvb); |
screamer | 0:7a64fbb4069d | 108 | msg_ps->state = SNMP_MSG_EMPTY; |
screamer | 0:7a64fbb4069d | 109 | } |
screamer | 0:7a64fbb4069d | 110 | |
screamer | 0:7a64fbb4069d | 111 | static void |
screamer | 0:7a64fbb4069d | 112 | snmp_ok_response(struct snmp_msg_pstat *msg_ps) |
screamer | 0:7a64fbb4069d | 113 | { |
screamer | 0:7a64fbb4069d | 114 | err_t err_ret; |
screamer | 0:7a64fbb4069d | 115 | |
screamer | 0:7a64fbb4069d | 116 | err_ret = snmp_send_response(msg_ps); |
screamer | 0:7a64fbb4069d | 117 | if (err_ret == ERR_MEM) |
screamer | 0:7a64fbb4069d | 118 | { |
screamer | 0:7a64fbb4069d | 119 | /* serious memory problem, can't return tooBig */ |
screamer | 0:7a64fbb4069d | 120 | } |
screamer | 0:7a64fbb4069d | 121 | else |
screamer | 0:7a64fbb4069d | 122 | { |
screamer | 0:7a64fbb4069d | 123 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event = %"S32_F"\n",msg_ps->error_status)); |
screamer | 0:7a64fbb4069d | 124 | } |
screamer | 0:7a64fbb4069d | 125 | /* free varbinds (if available) */ |
screamer | 0:7a64fbb4069d | 126 | snmp_varbind_list_free(&msg_ps->invb); |
screamer | 0:7a64fbb4069d | 127 | snmp_varbind_list_free(&msg_ps->outvb); |
screamer | 0:7a64fbb4069d | 128 | msg_ps->state = SNMP_MSG_EMPTY; |
screamer | 0:7a64fbb4069d | 129 | } |
screamer | 0:7a64fbb4069d | 130 | |
screamer | 0:7a64fbb4069d | 131 | /** |
screamer | 0:7a64fbb4069d | 132 | * Service an internal or external event for SNMP GET. |
screamer | 0:7a64fbb4069d | 133 | * |
screamer | 0:7a64fbb4069d | 134 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1) |
screamer | 0:7a64fbb4069d | 135 | * @param msg_ps points to the assosicated message process state |
screamer | 0:7a64fbb4069d | 136 | */ |
screamer | 0:7a64fbb4069d | 137 | static void |
screamer | 0:7a64fbb4069d | 138 | snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps) |
screamer | 0:7a64fbb4069d | 139 | { |
screamer | 0:7a64fbb4069d | 140 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_get_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state)); |
screamer | 0:7a64fbb4069d | 141 | |
screamer | 0:7a64fbb4069d | 142 | if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF) |
screamer | 0:7a64fbb4069d | 143 | { |
screamer | 0:7a64fbb4069d | 144 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 145 | struct snmp_name_ptr np; |
screamer | 0:7a64fbb4069d | 146 | |
screamer | 0:7a64fbb4069d | 147 | /* get_object_def() answer*/ |
screamer | 0:7a64fbb4069d | 148 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 149 | np = msg_ps->ext_name_ptr; |
screamer | 0:7a64fbb4069d | 150 | |
screamer | 0:7a64fbb4069d | 151 | /* translate answer into a known lifeform */ |
screamer | 0:7a64fbb4069d | 152 | en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 153 | if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) |
screamer | 0:7a64fbb4069d | 154 | { |
screamer | 0:7a64fbb4069d | 155 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE; |
screamer | 0:7a64fbb4069d | 156 | en->get_value_q(request_id, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 157 | } |
screamer | 0:7a64fbb4069d | 158 | else |
screamer | 0:7a64fbb4069d | 159 | { |
screamer | 0:7a64fbb4069d | 160 | en->get_object_def_pc(request_id, np.ident_len, np.ident); |
screamer | 0:7a64fbb4069d | 161 | /* search failed, object id points to unknown object (nosuchname) */ |
screamer | 0:7a64fbb4069d | 162 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 163 | } |
screamer | 0:7a64fbb4069d | 164 | } |
screamer | 0:7a64fbb4069d | 165 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE) |
screamer | 0:7a64fbb4069d | 166 | { |
screamer | 0:7a64fbb4069d | 167 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 168 | struct snmp_varbind *vb; |
screamer | 0:7a64fbb4069d | 169 | |
screamer | 0:7a64fbb4069d | 170 | /* get_value() answer */ |
screamer | 0:7a64fbb4069d | 171 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 172 | |
screamer | 0:7a64fbb4069d | 173 | /* allocate output varbind */ |
screamer | 0:7a64fbb4069d | 174 | vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind)); |
screamer | 0:7a64fbb4069d | 175 | LWIP_ASSERT("vb != NULL",vb != NULL); |
screamer | 0:7a64fbb4069d | 176 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 177 | { |
screamer | 0:7a64fbb4069d | 178 | vb->next = NULL; |
screamer | 0:7a64fbb4069d | 179 | vb->prev = NULL; |
screamer | 0:7a64fbb4069d | 180 | |
screamer | 0:7a64fbb4069d | 181 | /* move name from invb to outvb */ |
screamer | 0:7a64fbb4069d | 182 | vb->ident = msg_ps->vb_ptr->ident; |
screamer | 0:7a64fbb4069d | 183 | vb->ident_len = msg_ps->vb_ptr->ident_len; |
screamer | 0:7a64fbb4069d | 184 | /* ensure this memory is refereced once only */ |
screamer | 0:7a64fbb4069d | 185 | msg_ps->vb_ptr->ident = NULL; |
screamer | 0:7a64fbb4069d | 186 | msg_ps->vb_ptr->ident_len = 0; |
screamer | 0:7a64fbb4069d | 187 | |
screamer | 0:7a64fbb4069d | 188 | vb->value_type = msg_ps->ext_object_def.asn_type; |
screamer | 0:7a64fbb4069d | 189 | vb->value_len = msg_ps->ext_object_def.v_len; |
screamer | 0:7a64fbb4069d | 190 | if (vb->value_len > 0) |
screamer | 0:7a64fbb4069d | 191 | { |
screamer | 0:7a64fbb4069d | 192 | vb->value = mem_malloc(vb->value_len); |
screamer | 0:7a64fbb4069d | 193 | LWIP_ASSERT("vb->value != NULL",vb->value != NULL); |
screamer | 0:7a64fbb4069d | 194 | if (vb->value != NULL) |
screamer | 0:7a64fbb4069d | 195 | { |
screamer | 0:7a64fbb4069d | 196 | en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value); |
screamer | 0:7a64fbb4069d | 197 | snmp_varbind_tail_add(&msg_ps->outvb, vb); |
screamer | 0:7a64fbb4069d | 198 | /* search again (if vb_idx < msg_ps->invb.count) */ |
screamer | 0:7a64fbb4069d | 199 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 200 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 201 | } |
screamer | 0:7a64fbb4069d | 202 | else |
screamer | 0:7a64fbb4069d | 203 | { |
screamer | 0:7a64fbb4069d | 204 | en->get_value_pc(request_id, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 205 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no variable space\n")); |
screamer | 0:7a64fbb4069d | 206 | msg_ps->vb_ptr->ident = vb->ident; |
screamer | 0:7a64fbb4069d | 207 | msg_ps->vb_ptr->ident_len = vb->ident_len; |
screamer | 0:7a64fbb4069d | 208 | mem_free(vb); |
screamer | 0:7a64fbb4069d | 209 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG); |
screamer | 0:7a64fbb4069d | 210 | } |
screamer | 0:7a64fbb4069d | 211 | } |
screamer | 0:7a64fbb4069d | 212 | else |
screamer | 0:7a64fbb4069d | 213 | { |
screamer | 0:7a64fbb4069d | 214 | /* vb->value_len == 0, empty value (e.g. empty string) */ |
screamer | 0:7a64fbb4069d | 215 | en->get_value_a(request_id, &msg_ps->ext_object_def, 0, NULL); |
screamer | 0:7a64fbb4069d | 216 | vb->value = NULL; |
screamer | 0:7a64fbb4069d | 217 | snmp_varbind_tail_add(&msg_ps->outvb, vb); |
screamer | 0:7a64fbb4069d | 218 | /* search again (if vb_idx < msg_ps->invb.count) */ |
screamer | 0:7a64fbb4069d | 219 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 220 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 221 | } |
screamer | 0:7a64fbb4069d | 222 | } |
screamer | 0:7a64fbb4069d | 223 | else |
screamer | 0:7a64fbb4069d | 224 | { |
screamer | 0:7a64fbb4069d | 225 | en->get_value_pc(request_id, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 226 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: no outvb space\n")); |
screamer | 0:7a64fbb4069d | 227 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG); |
screamer | 0:7a64fbb4069d | 228 | } |
screamer | 0:7a64fbb4069d | 229 | } |
screamer | 0:7a64fbb4069d | 230 | |
screamer | 0:7a64fbb4069d | 231 | while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) && |
screamer | 0:7a64fbb4069d | 232 | (msg_ps->vb_idx < msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 233 | { |
screamer | 0:7a64fbb4069d | 234 | struct mib_node *mn; |
screamer | 0:7a64fbb4069d | 235 | struct snmp_name_ptr np; |
screamer | 0:7a64fbb4069d | 236 | |
screamer | 0:7a64fbb4069d | 237 | if (msg_ps->vb_idx == 0) |
screamer | 0:7a64fbb4069d | 238 | { |
screamer | 0:7a64fbb4069d | 239 | msg_ps->vb_ptr = msg_ps->invb.head; |
screamer | 0:7a64fbb4069d | 240 | } |
screamer | 0:7a64fbb4069d | 241 | else |
screamer | 0:7a64fbb4069d | 242 | { |
screamer | 0:7a64fbb4069d | 243 | msg_ps->vb_ptr = msg_ps->vb_ptr->next; |
screamer | 0:7a64fbb4069d | 244 | } |
screamer | 0:7a64fbb4069d | 245 | /** test object identifier for .iso.org.dod.internet prefix */ |
screamer | 0:7a64fbb4069d | 246 | if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident)) |
screamer | 0:7a64fbb4069d | 247 | { |
screamer | 0:7a64fbb4069d | 248 | mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4, |
screamer | 0:7a64fbb4069d | 249 | msg_ps->vb_ptr->ident + 4, &np); |
screamer | 0:7a64fbb4069d | 250 | if (mn != NULL) |
screamer | 0:7a64fbb4069d | 251 | { |
screamer | 0:7a64fbb4069d | 252 | if (mn->node_type == MIB_NODE_EX) |
screamer | 0:7a64fbb4069d | 253 | { |
screamer | 0:7a64fbb4069d | 254 | /* external object */ |
screamer | 0:7a64fbb4069d | 255 | struct mib_external_node *en = (struct mib_external_node*)mn; |
screamer | 0:7a64fbb4069d | 256 | |
screamer | 0:7a64fbb4069d | 257 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF; |
screamer | 0:7a64fbb4069d | 258 | /* save en && args in msg_ps!! */ |
screamer | 0:7a64fbb4069d | 259 | msg_ps->ext_mib_node = en; |
screamer | 0:7a64fbb4069d | 260 | msg_ps->ext_name_ptr = np; |
screamer | 0:7a64fbb4069d | 261 | |
screamer | 0:7a64fbb4069d | 262 | en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident); |
screamer | 0:7a64fbb4069d | 263 | } |
screamer | 0:7a64fbb4069d | 264 | else |
screamer | 0:7a64fbb4069d | 265 | { |
screamer | 0:7a64fbb4069d | 266 | /* internal object */ |
screamer | 0:7a64fbb4069d | 267 | struct obj_def object_def; |
screamer | 0:7a64fbb4069d | 268 | |
screamer | 0:7a64fbb4069d | 269 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF; |
screamer | 0:7a64fbb4069d | 270 | mn->get_object_def(np.ident_len, np.ident, &object_def); |
screamer | 0:7a64fbb4069d | 271 | if (object_def.instance != MIB_OBJECT_NONE) |
screamer | 0:7a64fbb4069d | 272 | { |
screamer | 0:7a64fbb4069d | 273 | mn = mn; |
screamer | 0:7a64fbb4069d | 274 | } |
screamer | 0:7a64fbb4069d | 275 | else |
screamer | 0:7a64fbb4069d | 276 | { |
screamer | 0:7a64fbb4069d | 277 | /* search failed, object id points to unknown object (nosuchname) */ |
screamer | 0:7a64fbb4069d | 278 | mn = NULL; |
screamer | 0:7a64fbb4069d | 279 | } |
screamer | 0:7a64fbb4069d | 280 | if (mn != NULL) |
screamer | 0:7a64fbb4069d | 281 | { |
screamer | 0:7a64fbb4069d | 282 | struct snmp_varbind *vb; |
screamer | 0:7a64fbb4069d | 283 | |
screamer | 0:7a64fbb4069d | 284 | msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE; |
screamer | 0:7a64fbb4069d | 285 | /* allocate output varbind */ |
screamer | 0:7a64fbb4069d | 286 | vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind)); |
screamer | 0:7a64fbb4069d | 287 | LWIP_ASSERT("vb != NULL",vb != NULL); |
screamer | 0:7a64fbb4069d | 288 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 289 | { |
screamer | 0:7a64fbb4069d | 290 | vb->next = NULL; |
screamer | 0:7a64fbb4069d | 291 | vb->prev = NULL; |
screamer | 0:7a64fbb4069d | 292 | |
screamer | 0:7a64fbb4069d | 293 | /* move name from invb to outvb */ |
screamer | 0:7a64fbb4069d | 294 | vb->ident = msg_ps->vb_ptr->ident; |
screamer | 0:7a64fbb4069d | 295 | vb->ident_len = msg_ps->vb_ptr->ident_len; |
screamer | 0:7a64fbb4069d | 296 | /* ensure this memory is refereced once only */ |
screamer | 0:7a64fbb4069d | 297 | msg_ps->vb_ptr->ident = NULL; |
screamer | 0:7a64fbb4069d | 298 | msg_ps->vb_ptr->ident_len = 0; |
screamer | 0:7a64fbb4069d | 299 | |
screamer | 0:7a64fbb4069d | 300 | vb->value_type = object_def.asn_type; |
screamer | 0:7a64fbb4069d | 301 | vb->value_len = object_def.v_len; |
screamer | 0:7a64fbb4069d | 302 | if (vb->value_len > 0) |
screamer | 0:7a64fbb4069d | 303 | { |
screamer | 0:7a64fbb4069d | 304 | vb->value = mem_malloc(vb->value_len); |
screamer | 0:7a64fbb4069d | 305 | LWIP_ASSERT("vb->value != NULL",vb->value != NULL); |
screamer | 0:7a64fbb4069d | 306 | if (vb->value != NULL) |
screamer | 0:7a64fbb4069d | 307 | { |
screamer | 0:7a64fbb4069d | 308 | mn->get_value(&object_def, vb->value_len, vb->value); |
screamer | 0:7a64fbb4069d | 309 | snmp_varbind_tail_add(&msg_ps->outvb, vb); |
screamer | 0:7a64fbb4069d | 310 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 311 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 312 | } |
screamer | 0:7a64fbb4069d | 313 | else |
screamer | 0:7a64fbb4069d | 314 | { |
screamer | 0:7a64fbb4069d | 315 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n")); |
screamer | 0:7a64fbb4069d | 316 | msg_ps->vb_ptr->ident = vb->ident; |
screamer | 0:7a64fbb4069d | 317 | msg_ps->vb_ptr->ident_len = vb->ident_len; |
screamer | 0:7a64fbb4069d | 318 | mem_free(vb); |
screamer | 0:7a64fbb4069d | 319 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG); |
screamer | 0:7a64fbb4069d | 320 | } |
screamer | 0:7a64fbb4069d | 321 | } |
screamer | 0:7a64fbb4069d | 322 | else |
screamer | 0:7a64fbb4069d | 323 | { |
screamer | 0:7a64fbb4069d | 324 | /* vb->value_len == 0, empty value (e.g. empty string) */ |
screamer | 0:7a64fbb4069d | 325 | vb->value = NULL; |
screamer | 0:7a64fbb4069d | 326 | snmp_varbind_tail_add(&msg_ps->outvb, vb); |
screamer | 0:7a64fbb4069d | 327 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 328 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 329 | } |
screamer | 0:7a64fbb4069d | 330 | } |
screamer | 0:7a64fbb4069d | 331 | else |
screamer | 0:7a64fbb4069d | 332 | { |
screamer | 0:7a64fbb4069d | 333 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate outvb space\n")); |
screamer | 0:7a64fbb4069d | 334 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG); |
screamer | 0:7a64fbb4069d | 335 | } |
screamer | 0:7a64fbb4069d | 336 | } |
screamer | 0:7a64fbb4069d | 337 | } |
screamer | 0:7a64fbb4069d | 338 | } |
screamer | 0:7a64fbb4069d | 339 | } |
screamer | 0:7a64fbb4069d | 340 | else |
screamer | 0:7a64fbb4069d | 341 | { |
screamer | 0:7a64fbb4069d | 342 | mn = NULL; |
screamer | 0:7a64fbb4069d | 343 | } |
screamer | 0:7a64fbb4069d | 344 | if (mn == NULL) |
screamer | 0:7a64fbb4069d | 345 | { |
screamer | 0:7a64fbb4069d | 346 | /* mn == NULL, noSuchName */ |
screamer | 0:7a64fbb4069d | 347 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 348 | } |
screamer | 0:7a64fbb4069d | 349 | } |
screamer | 0:7a64fbb4069d | 350 | if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) && |
screamer | 0:7a64fbb4069d | 351 | (msg_ps->vb_idx == msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 352 | { |
screamer | 0:7a64fbb4069d | 353 | snmp_ok_response(msg_ps); |
screamer | 0:7a64fbb4069d | 354 | } |
screamer | 0:7a64fbb4069d | 355 | } |
screamer | 0:7a64fbb4069d | 356 | |
screamer | 0:7a64fbb4069d | 357 | /** |
screamer | 0:7a64fbb4069d | 358 | * Service an internal or external event for SNMP GETNEXT. |
screamer | 0:7a64fbb4069d | 359 | * |
screamer | 0:7a64fbb4069d | 360 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1) |
screamer | 0:7a64fbb4069d | 361 | * @param msg_ps points to the assosicated message process state |
screamer | 0:7a64fbb4069d | 362 | */ |
screamer | 0:7a64fbb4069d | 363 | static void |
screamer | 0:7a64fbb4069d | 364 | snmp_msg_getnext_event(u8_t request_id, struct snmp_msg_pstat *msg_ps) |
screamer | 0:7a64fbb4069d | 365 | { |
screamer | 0:7a64fbb4069d | 366 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state)); |
screamer | 0:7a64fbb4069d | 367 | |
screamer | 0:7a64fbb4069d | 368 | if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF) |
screamer | 0:7a64fbb4069d | 369 | { |
screamer | 0:7a64fbb4069d | 370 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 371 | |
screamer | 0:7a64fbb4069d | 372 | /* get_object_def() answer*/ |
screamer | 0:7a64fbb4069d | 373 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 374 | |
screamer | 0:7a64fbb4069d | 375 | /* translate answer into a known lifeform */ |
screamer | 0:7a64fbb4069d | 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); |
screamer | 0:7a64fbb4069d | 377 | if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) |
screamer | 0:7a64fbb4069d | 378 | { |
screamer | 0:7a64fbb4069d | 379 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_VALUE; |
screamer | 0:7a64fbb4069d | 380 | en->get_value_q(request_id, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 381 | } |
screamer | 0:7a64fbb4069d | 382 | else |
screamer | 0:7a64fbb4069d | 383 | { |
screamer | 0:7a64fbb4069d | 384 | en->get_object_def_pc(request_id, 1, &msg_ps->ext_oid.id[msg_ps->ext_oid.len - 1]); |
screamer | 0:7a64fbb4069d | 385 | /* search failed, object id points to unknown object (nosuchname) */ |
screamer | 0:7a64fbb4069d | 386 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 387 | } |
screamer | 0:7a64fbb4069d | 388 | } |
screamer | 0:7a64fbb4069d | 389 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_VALUE) |
screamer | 0:7a64fbb4069d | 390 | { |
screamer | 0:7a64fbb4069d | 391 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 392 | struct snmp_varbind *vb; |
screamer | 0:7a64fbb4069d | 393 | |
screamer | 0:7a64fbb4069d | 394 | /* get_value() answer */ |
screamer | 0:7a64fbb4069d | 395 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 396 | |
screamer | 0:7a64fbb4069d | 397 | vb = snmp_varbind_alloc(&msg_ps->ext_oid, |
screamer | 0:7a64fbb4069d | 398 | msg_ps->ext_object_def.asn_type, |
screamer | 0:7a64fbb4069d | 399 | msg_ps->ext_object_def.v_len); |
screamer | 0:7a64fbb4069d | 400 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 401 | { |
screamer | 0:7a64fbb4069d | 402 | en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value); |
screamer | 0:7a64fbb4069d | 403 | snmp_varbind_tail_add(&msg_ps->outvb, vb); |
screamer | 0:7a64fbb4069d | 404 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 405 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 406 | } |
screamer | 0:7a64fbb4069d | 407 | else |
screamer | 0:7a64fbb4069d | 408 | { |
screamer | 0:7a64fbb4069d | 409 | en->get_value_pc(request_id, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 410 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_getnext_event: couldn't allocate outvb space\n")); |
screamer | 0:7a64fbb4069d | 411 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG); |
screamer | 0:7a64fbb4069d | 412 | } |
screamer | 0:7a64fbb4069d | 413 | } |
screamer | 0:7a64fbb4069d | 414 | |
screamer | 0:7a64fbb4069d | 415 | while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) && |
screamer | 0:7a64fbb4069d | 416 | (msg_ps->vb_idx < msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 417 | { |
screamer | 0:7a64fbb4069d | 418 | struct mib_node *mn; |
screamer | 0:7a64fbb4069d | 419 | struct snmp_obj_id oid; |
screamer | 0:7a64fbb4069d | 420 | |
screamer | 0:7a64fbb4069d | 421 | if (msg_ps->vb_idx == 0) |
screamer | 0:7a64fbb4069d | 422 | { |
screamer | 0:7a64fbb4069d | 423 | msg_ps->vb_ptr = msg_ps->invb.head; |
screamer | 0:7a64fbb4069d | 424 | } |
screamer | 0:7a64fbb4069d | 425 | else |
screamer | 0:7a64fbb4069d | 426 | { |
screamer | 0:7a64fbb4069d | 427 | msg_ps->vb_ptr = msg_ps->vb_ptr->next; |
screamer | 0:7a64fbb4069d | 428 | } |
screamer | 0:7a64fbb4069d | 429 | if (snmp_iso_prefix_expand(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident, &oid)) |
screamer | 0:7a64fbb4069d | 430 | { |
screamer | 0:7a64fbb4069d | 431 | if (msg_ps->vb_ptr->ident_len > 3) |
screamer | 0:7a64fbb4069d | 432 | { |
screamer | 0:7a64fbb4069d | 433 | /* can offset ident_len and ident */ |
screamer | 0:7a64fbb4069d | 434 | mn = snmp_expand_tree((struct mib_node*)&internet, |
screamer | 0:7a64fbb4069d | 435 | msg_ps->vb_ptr->ident_len - 4, |
screamer | 0:7a64fbb4069d | 436 | msg_ps->vb_ptr->ident + 4, &oid); |
screamer | 0:7a64fbb4069d | 437 | } |
screamer | 0:7a64fbb4069d | 438 | else |
screamer | 0:7a64fbb4069d | 439 | { |
screamer | 0:7a64fbb4069d | 440 | /* can't offset ident_len -4, ident + 4 */ |
screamer | 0:7a64fbb4069d | 441 | mn = snmp_expand_tree((struct mib_node*)&internet, 0, NULL, &oid); |
screamer | 0:7a64fbb4069d | 442 | } |
screamer | 0:7a64fbb4069d | 443 | } |
screamer | 0:7a64fbb4069d | 444 | else |
screamer | 0:7a64fbb4069d | 445 | { |
screamer | 0:7a64fbb4069d | 446 | mn = NULL; |
screamer | 0:7a64fbb4069d | 447 | } |
screamer | 0:7a64fbb4069d | 448 | if (mn != NULL) |
screamer | 0:7a64fbb4069d | 449 | { |
screamer | 0:7a64fbb4069d | 450 | if (mn->node_type == MIB_NODE_EX) |
screamer | 0:7a64fbb4069d | 451 | { |
screamer | 0:7a64fbb4069d | 452 | /* external object */ |
screamer | 0:7a64fbb4069d | 453 | struct mib_external_node *en = (struct mib_external_node*)mn; |
screamer | 0:7a64fbb4069d | 454 | |
screamer | 0:7a64fbb4069d | 455 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF; |
screamer | 0:7a64fbb4069d | 456 | /* save en && args in msg_ps!! */ |
screamer | 0:7a64fbb4069d | 457 | msg_ps->ext_mib_node = en; |
screamer | 0:7a64fbb4069d | 458 | msg_ps->ext_oid = oid; |
screamer | 0:7a64fbb4069d | 459 | |
screamer | 0:7a64fbb4069d | 460 | en->get_object_def_q(en->addr_inf, request_id, 1, &oid.id[oid.len - 1]); |
screamer | 0:7a64fbb4069d | 461 | } |
screamer | 0:7a64fbb4069d | 462 | else |
screamer | 0:7a64fbb4069d | 463 | { |
screamer | 0:7a64fbb4069d | 464 | /* internal object */ |
screamer | 0:7a64fbb4069d | 465 | struct obj_def object_def; |
screamer | 0:7a64fbb4069d | 466 | struct snmp_varbind *vb; |
screamer | 0:7a64fbb4069d | 467 | |
screamer | 0:7a64fbb4069d | 468 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF; |
screamer | 0:7a64fbb4069d | 469 | mn->get_object_def(1, &oid.id[oid.len - 1], &object_def); |
screamer | 0:7a64fbb4069d | 470 | |
screamer | 0:7a64fbb4069d | 471 | vb = snmp_varbind_alloc(&oid, object_def.asn_type, object_def.v_len); |
screamer | 0:7a64fbb4069d | 472 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 473 | { |
screamer | 0:7a64fbb4069d | 474 | msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE; |
screamer | 0:7a64fbb4069d | 475 | mn->get_value(&object_def, object_def.v_len, vb->value); |
screamer | 0:7a64fbb4069d | 476 | snmp_varbind_tail_add(&msg_ps->outvb, vb); |
screamer | 0:7a64fbb4069d | 477 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 478 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 479 | } |
screamer | 0:7a64fbb4069d | 480 | else |
screamer | 0:7a64fbb4069d | 481 | { |
screamer | 0:7a64fbb4069d | 482 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv couldn't allocate outvb space\n")); |
screamer | 0:7a64fbb4069d | 483 | snmp_error_response(msg_ps,SNMP_ES_TOOBIG); |
screamer | 0:7a64fbb4069d | 484 | } |
screamer | 0:7a64fbb4069d | 485 | } |
screamer | 0:7a64fbb4069d | 486 | } |
screamer | 0:7a64fbb4069d | 487 | if (mn == NULL) |
screamer | 0:7a64fbb4069d | 488 | { |
screamer | 0:7a64fbb4069d | 489 | /* mn == NULL, noSuchName */ |
screamer | 0:7a64fbb4069d | 490 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 491 | } |
screamer | 0:7a64fbb4069d | 492 | } |
screamer | 0:7a64fbb4069d | 493 | if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) && |
screamer | 0:7a64fbb4069d | 494 | (msg_ps->vb_idx == msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 495 | { |
screamer | 0:7a64fbb4069d | 496 | snmp_ok_response(msg_ps); |
screamer | 0:7a64fbb4069d | 497 | } |
screamer | 0:7a64fbb4069d | 498 | } |
screamer | 0:7a64fbb4069d | 499 | |
screamer | 0:7a64fbb4069d | 500 | /** |
screamer | 0:7a64fbb4069d | 501 | * Service an internal or external event for SNMP SET. |
screamer | 0:7a64fbb4069d | 502 | * |
screamer | 0:7a64fbb4069d | 503 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1) |
screamer | 0:7a64fbb4069d | 504 | * @param msg_ps points to the assosicated message process state |
screamer | 0:7a64fbb4069d | 505 | */ |
screamer | 0:7a64fbb4069d | 506 | static void |
screamer | 0:7a64fbb4069d | 507 | snmp_msg_set_event(u8_t request_id, struct snmp_msg_pstat *msg_ps) |
screamer | 0:7a64fbb4069d | 508 | { |
screamer | 0:7a64fbb4069d | 509 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_set_event: msg_ps->state==%"U16_F"\n",(u16_t)msg_ps->state)); |
screamer | 0:7a64fbb4069d | 510 | |
screamer | 0:7a64fbb4069d | 511 | if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF) |
screamer | 0:7a64fbb4069d | 512 | { |
screamer | 0:7a64fbb4069d | 513 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 514 | struct snmp_name_ptr np; |
screamer | 0:7a64fbb4069d | 515 | |
screamer | 0:7a64fbb4069d | 516 | /* get_object_def() answer*/ |
screamer | 0:7a64fbb4069d | 517 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 518 | np = msg_ps->ext_name_ptr; |
screamer | 0:7a64fbb4069d | 519 | |
screamer | 0:7a64fbb4069d | 520 | /* translate answer into a known lifeform */ |
screamer | 0:7a64fbb4069d | 521 | en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 522 | if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) |
screamer | 0:7a64fbb4069d | 523 | { |
screamer | 0:7a64fbb4069d | 524 | msg_ps->state = SNMP_MSG_EXTERNAL_SET_TEST; |
screamer | 0:7a64fbb4069d | 525 | en->set_test_q(request_id, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 526 | } |
screamer | 0:7a64fbb4069d | 527 | else |
screamer | 0:7a64fbb4069d | 528 | { |
screamer | 0:7a64fbb4069d | 529 | en->get_object_def_pc(request_id, np.ident_len, np.ident); |
screamer | 0:7a64fbb4069d | 530 | /* search failed, object id points to unknown object (nosuchname) */ |
screamer | 0:7a64fbb4069d | 531 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 532 | } |
screamer | 0:7a64fbb4069d | 533 | } |
screamer | 0:7a64fbb4069d | 534 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_TEST) |
screamer | 0:7a64fbb4069d | 535 | { |
screamer | 0:7a64fbb4069d | 536 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 537 | |
screamer | 0:7a64fbb4069d | 538 | /* set_test() answer*/ |
screamer | 0:7a64fbb4069d | 539 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 540 | |
screamer | 0:7a64fbb4069d | 541 | if (msg_ps->ext_object_def.access == MIB_OBJECT_READ_WRITE) |
screamer | 0:7a64fbb4069d | 542 | { |
screamer | 0:7a64fbb4069d | 543 | if ((msg_ps->ext_object_def.asn_type == msg_ps->vb_ptr->value_type) && |
screamer | 0:7a64fbb4069d | 544 | (en->set_test_a(request_id,&msg_ps->ext_object_def, |
screamer | 0:7a64fbb4069d | 545 | msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0)) |
screamer | 0:7a64fbb4069d | 546 | { |
screamer | 0:7a64fbb4069d | 547 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 548 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 549 | } |
screamer | 0:7a64fbb4069d | 550 | else |
screamer | 0:7a64fbb4069d | 551 | { |
screamer | 0:7a64fbb4069d | 552 | en->set_test_pc(request_id,&msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 553 | /* bad value */ |
screamer | 0:7a64fbb4069d | 554 | snmp_error_response(msg_ps,SNMP_ES_BADVALUE); |
screamer | 0:7a64fbb4069d | 555 | } |
screamer | 0:7a64fbb4069d | 556 | } |
screamer | 0:7a64fbb4069d | 557 | else |
screamer | 0:7a64fbb4069d | 558 | { |
screamer | 0:7a64fbb4069d | 559 | en->set_test_pc(request_id,&msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 560 | /* object not available for set */ |
screamer | 0:7a64fbb4069d | 561 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 562 | } |
screamer | 0:7a64fbb4069d | 563 | } |
screamer | 0:7a64fbb4069d | 564 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_GET_OBJDEF_S) |
screamer | 0:7a64fbb4069d | 565 | { |
screamer | 0:7a64fbb4069d | 566 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 567 | struct snmp_name_ptr np; |
screamer | 0:7a64fbb4069d | 568 | |
screamer | 0:7a64fbb4069d | 569 | /* get_object_def() answer*/ |
screamer | 0:7a64fbb4069d | 570 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 571 | np = msg_ps->ext_name_ptr; |
screamer | 0:7a64fbb4069d | 572 | |
screamer | 0:7a64fbb4069d | 573 | /* translate answer into a known lifeform */ |
screamer | 0:7a64fbb4069d | 574 | en->get_object_def_a(request_id, np.ident_len, np.ident, &msg_ps->ext_object_def); |
screamer | 0:7a64fbb4069d | 575 | if (msg_ps->ext_object_def.instance != MIB_OBJECT_NONE) |
screamer | 0:7a64fbb4069d | 576 | { |
screamer | 0:7a64fbb4069d | 577 | msg_ps->state = SNMP_MSG_EXTERNAL_SET_VALUE; |
screamer | 0:7a64fbb4069d | 578 | en->set_value_q(request_id, &msg_ps->ext_object_def, |
screamer | 0:7a64fbb4069d | 579 | msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value); |
screamer | 0:7a64fbb4069d | 580 | } |
screamer | 0:7a64fbb4069d | 581 | else |
screamer | 0:7a64fbb4069d | 582 | { |
screamer | 0:7a64fbb4069d | 583 | en->get_object_def_pc(request_id, np.ident_len, np.ident); |
screamer | 0:7a64fbb4069d | 584 | /* set_value failed, object has disappeared for some odd reason?? */ |
screamer | 0:7a64fbb4069d | 585 | snmp_error_response(msg_ps,SNMP_ES_GENERROR); |
screamer | 0:7a64fbb4069d | 586 | } |
screamer | 0:7a64fbb4069d | 587 | } |
screamer | 0:7a64fbb4069d | 588 | else if (msg_ps->state == SNMP_MSG_EXTERNAL_SET_VALUE) |
screamer | 0:7a64fbb4069d | 589 | { |
screamer | 0:7a64fbb4069d | 590 | struct mib_external_node *en; |
screamer | 0:7a64fbb4069d | 591 | |
screamer | 0:7a64fbb4069d | 592 | /** set_value_a() @todo: use reply value?? */ |
screamer | 0:7a64fbb4069d | 593 | en = msg_ps->ext_mib_node; |
screamer | 0:7a64fbb4069d | 594 | en->set_value_a(request_id, &msg_ps->ext_object_def, 0, NULL); |
screamer | 0:7a64fbb4069d | 595 | |
screamer | 0:7a64fbb4069d | 596 | /** @todo use set_value_pc() if toobig */ |
screamer | 0:7a64fbb4069d | 597 | msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE; |
screamer | 0:7a64fbb4069d | 598 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 599 | } |
screamer | 0:7a64fbb4069d | 600 | |
screamer | 0:7a64fbb4069d | 601 | /* test all values before setting */ |
screamer | 0:7a64fbb4069d | 602 | while ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) && |
screamer | 0:7a64fbb4069d | 603 | (msg_ps->vb_idx < msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 604 | { |
screamer | 0:7a64fbb4069d | 605 | struct mib_node *mn; |
screamer | 0:7a64fbb4069d | 606 | struct snmp_name_ptr np; |
screamer | 0:7a64fbb4069d | 607 | |
screamer | 0:7a64fbb4069d | 608 | if (msg_ps->vb_idx == 0) |
screamer | 0:7a64fbb4069d | 609 | { |
screamer | 0:7a64fbb4069d | 610 | msg_ps->vb_ptr = msg_ps->invb.head; |
screamer | 0:7a64fbb4069d | 611 | } |
screamer | 0:7a64fbb4069d | 612 | else |
screamer | 0:7a64fbb4069d | 613 | { |
screamer | 0:7a64fbb4069d | 614 | msg_ps->vb_ptr = msg_ps->vb_ptr->next; |
screamer | 0:7a64fbb4069d | 615 | } |
screamer | 0:7a64fbb4069d | 616 | /** test object identifier for .iso.org.dod.internet prefix */ |
screamer | 0:7a64fbb4069d | 617 | if (snmp_iso_prefix_tst(msg_ps->vb_ptr->ident_len, msg_ps->vb_ptr->ident)) |
screamer | 0:7a64fbb4069d | 618 | { |
screamer | 0:7a64fbb4069d | 619 | mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4, |
screamer | 0:7a64fbb4069d | 620 | msg_ps->vb_ptr->ident + 4, &np); |
screamer | 0:7a64fbb4069d | 621 | if (mn != NULL) |
screamer | 0:7a64fbb4069d | 622 | { |
screamer | 0:7a64fbb4069d | 623 | if (mn->node_type == MIB_NODE_EX) |
screamer | 0:7a64fbb4069d | 624 | { |
screamer | 0:7a64fbb4069d | 625 | /* external object */ |
screamer | 0:7a64fbb4069d | 626 | struct mib_external_node *en = (struct mib_external_node*)mn; |
screamer | 0:7a64fbb4069d | 627 | |
screamer | 0:7a64fbb4069d | 628 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF; |
screamer | 0:7a64fbb4069d | 629 | /* save en && args in msg_ps!! */ |
screamer | 0:7a64fbb4069d | 630 | msg_ps->ext_mib_node = en; |
screamer | 0:7a64fbb4069d | 631 | msg_ps->ext_name_ptr = np; |
screamer | 0:7a64fbb4069d | 632 | |
screamer | 0:7a64fbb4069d | 633 | en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident); |
screamer | 0:7a64fbb4069d | 634 | } |
screamer | 0:7a64fbb4069d | 635 | else |
screamer | 0:7a64fbb4069d | 636 | { |
screamer | 0:7a64fbb4069d | 637 | /* internal object */ |
screamer | 0:7a64fbb4069d | 638 | struct obj_def object_def; |
screamer | 0:7a64fbb4069d | 639 | |
screamer | 0:7a64fbb4069d | 640 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF; |
screamer | 0:7a64fbb4069d | 641 | mn->get_object_def(np.ident_len, np.ident, &object_def); |
screamer | 0:7a64fbb4069d | 642 | if (object_def.instance != MIB_OBJECT_NONE) |
screamer | 0:7a64fbb4069d | 643 | { |
screamer | 0:7a64fbb4069d | 644 | mn = mn; |
screamer | 0:7a64fbb4069d | 645 | } |
screamer | 0:7a64fbb4069d | 646 | else |
screamer | 0:7a64fbb4069d | 647 | { |
screamer | 0:7a64fbb4069d | 648 | /* search failed, object id points to unknown object (nosuchname) */ |
screamer | 0:7a64fbb4069d | 649 | mn = NULL; |
screamer | 0:7a64fbb4069d | 650 | } |
screamer | 0:7a64fbb4069d | 651 | if (mn != NULL) |
screamer | 0:7a64fbb4069d | 652 | { |
screamer | 0:7a64fbb4069d | 653 | msg_ps->state = SNMP_MSG_INTERNAL_SET_TEST; |
screamer | 0:7a64fbb4069d | 654 | |
screamer | 0:7a64fbb4069d | 655 | if (object_def.access == MIB_OBJECT_READ_WRITE) |
screamer | 0:7a64fbb4069d | 656 | { |
screamer | 0:7a64fbb4069d | 657 | if ((object_def.asn_type == msg_ps->vb_ptr->value_type) && |
screamer | 0:7a64fbb4069d | 658 | (mn->set_test(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value) != 0)) |
screamer | 0:7a64fbb4069d | 659 | { |
screamer | 0:7a64fbb4069d | 660 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 661 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 662 | } |
screamer | 0:7a64fbb4069d | 663 | else |
screamer | 0:7a64fbb4069d | 664 | { |
screamer | 0:7a64fbb4069d | 665 | /* bad value */ |
screamer | 0:7a64fbb4069d | 666 | snmp_error_response(msg_ps,SNMP_ES_BADVALUE); |
screamer | 0:7a64fbb4069d | 667 | } |
screamer | 0:7a64fbb4069d | 668 | } |
screamer | 0:7a64fbb4069d | 669 | else |
screamer | 0:7a64fbb4069d | 670 | { |
screamer | 0:7a64fbb4069d | 671 | /* object not available for set */ |
screamer | 0:7a64fbb4069d | 672 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 673 | } |
screamer | 0:7a64fbb4069d | 674 | } |
screamer | 0:7a64fbb4069d | 675 | } |
screamer | 0:7a64fbb4069d | 676 | } |
screamer | 0:7a64fbb4069d | 677 | } |
screamer | 0:7a64fbb4069d | 678 | else |
screamer | 0:7a64fbb4069d | 679 | { |
screamer | 0:7a64fbb4069d | 680 | mn = NULL; |
screamer | 0:7a64fbb4069d | 681 | } |
screamer | 0:7a64fbb4069d | 682 | if (mn == NULL) |
screamer | 0:7a64fbb4069d | 683 | { |
screamer | 0:7a64fbb4069d | 684 | /* mn == NULL, noSuchName */ |
screamer | 0:7a64fbb4069d | 685 | snmp_error_response(msg_ps,SNMP_ES_NOSUCHNAME); |
screamer | 0:7a64fbb4069d | 686 | } |
screamer | 0:7a64fbb4069d | 687 | } |
screamer | 0:7a64fbb4069d | 688 | |
screamer | 0:7a64fbb4069d | 689 | if ((msg_ps->state == SNMP_MSG_SEARCH_OBJ) && |
screamer | 0:7a64fbb4069d | 690 | (msg_ps->vb_idx == msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 691 | { |
screamer | 0:7a64fbb4069d | 692 | msg_ps->vb_idx = 0; |
screamer | 0:7a64fbb4069d | 693 | msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE; |
screamer | 0:7a64fbb4069d | 694 | } |
screamer | 0:7a64fbb4069d | 695 | |
screamer | 0:7a64fbb4069d | 696 | /* set all values "atomically" (be as "atomic" as possible) */ |
screamer | 0:7a64fbb4069d | 697 | while ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) && |
screamer | 0:7a64fbb4069d | 698 | (msg_ps->vb_idx < msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 699 | { |
screamer | 0:7a64fbb4069d | 700 | struct mib_node *mn; |
screamer | 0:7a64fbb4069d | 701 | struct snmp_name_ptr np; |
screamer | 0:7a64fbb4069d | 702 | |
screamer | 0:7a64fbb4069d | 703 | if (msg_ps->vb_idx == 0) |
screamer | 0:7a64fbb4069d | 704 | { |
screamer | 0:7a64fbb4069d | 705 | msg_ps->vb_ptr = msg_ps->invb.head; |
screamer | 0:7a64fbb4069d | 706 | } |
screamer | 0:7a64fbb4069d | 707 | else |
screamer | 0:7a64fbb4069d | 708 | { |
screamer | 0:7a64fbb4069d | 709 | msg_ps->vb_ptr = msg_ps->vb_ptr->next; |
screamer | 0:7a64fbb4069d | 710 | } |
screamer | 0:7a64fbb4069d | 711 | /* skip iso prefix test, was done previously while settesting() */ |
screamer | 0:7a64fbb4069d | 712 | mn = snmp_search_tree((struct mib_node*)&internet, msg_ps->vb_ptr->ident_len - 4, |
screamer | 0:7a64fbb4069d | 713 | msg_ps->vb_ptr->ident + 4, &np); |
screamer | 0:7a64fbb4069d | 714 | /* check if object is still available |
screamer | 0:7a64fbb4069d | 715 | (e.g. external hot-plug thingy present?) */ |
screamer | 0:7a64fbb4069d | 716 | if (mn != NULL) |
screamer | 0:7a64fbb4069d | 717 | { |
screamer | 0:7a64fbb4069d | 718 | if (mn->node_type == MIB_NODE_EX) |
screamer | 0:7a64fbb4069d | 719 | { |
screamer | 0:7a64fbb4069d | 720 | /* external object */ |
screamer | 0:7a64fbb4069d | 721 | struct mib_external_node *en = (struct mib_external_node*)mn; |
screamer | 0:7a64fbb4069d | 722 | |
screamer | 0:7a64fbb4069d | 723 | msg_ps->state = SNMP_MSG_EXTERNAL_GET_OBJDEF_S; |
screamer | 0:7a64fbb4069d | 724 | /* save en && args in msg_ps!! */ |
screamer | 0:7a64fbb4069d | 725 | msg_ps->ext_mib_node = en; |
screamer | 0:7a64fbb4069d | 726 | msg_ps->ext_name_ptr = np; |
screamer | 0:7a64fbb4069d | 727 | |
screamer | 0:7a64fbb4069d | 728 | en->get_object_def_q(en->addr_inf, request_id, np.ident_len, np.ident); |
screamer | 0:7a64fbb4069d | 729 | } |
screamer | 0:7a64fbb4069d | 730 | else |
screamer | 0:7a64fbb4069d | 731 | { |
screamer | 0:7a64fbb4069d | 732 | /* internal object */ |
screamer | 0:7a64fbb4069d | 733 | struct obj_def object_def; |
screamer | 0:7a64fbb4069d | 734 | |
screamer | 0:7a64fbb4069d | 735 | msg_ps->state = SNMP_MSG_INTERNAL_GET_OBJDEF_S; |
screamer | 0:7a64fbb4069d | 736 | mn->get_object_def(np.ident_len, np.ident, &object_def); |
screamer | 0:7a64fbb4069d | 737 | msg_ps->state = SNMP_MSG_INTERNAL_SET_VALUE; |
screamer | 0:7a64fbb4069d | 738 | mn->set_value(&object_def,msg_ps->vb_ptr->value_len,msg_ps->vb_ptr->value); |
screamer | 0:7a64fbb4069d | 739 | msg_ps->vb_idx += 1; |
screamer | 0:7a64fbb4069d | 740 | } |
screamer | 0:7a64fbb4069d | 741 | } |
screamer | 0:7a64fbb4069d | 742 | } |
screamer | 0:7a64fbb4069d | 743 | if ((msg_ps->state == SNMP_MSG_INTERNAL_SET_VALUE) && |
screamer | 0:7a64fbb4069d | 744 | (msg_ps->vb_idx == msg_ps->invb.count)) |
screamer | 0:7a64fbb4069d | 745 | { |
screamer | 0:7a64fbb4069d | 746 | /* simply echo the input if we can set it |
screamer | 0:7a64fbb4069d | 747 | @todo do we need to return the actual value? |
screamer | 0:7a64fbb4069d | 748 | e.g. if value is silently modified or behaves sticky? */ |
screamer | 0:7a64fbb4069d | 749 | msg_ps->outvb = msg_ps->invb; |
screamer | 0:7a64fbb4069d | 750 | msg_ps->invb.head = NULL; |
screamer | 0:7a64fbb4069d | 751 | msg_ps->invb.tail = NULL; |
screamer | 0:7a64fbb4069d | 752 | msg_ps->invb.count = 0; |
screamer | 0:7a64fbb4069d | 753 | snmp_ok_response(msg_ps); |
screamer | 0:7a64fbb4069d | 754 | } |
screamer | 0:7a64fbb4069d | 755 | } |
screamer | 0:7a64fbb4069d | 756 | |
screamer | 0:7a64fbb4069d | 757 | |
screamer | 0:7a64fbb4069d | 758 | /** |
screamer | 0:7a64fbb4069d | 759 | * Handle one internal or external event. |
screamer | 0:7a64fbb4069d | 760 | * Called for one async event. (recv external/private answer) |
screamer | 0:7a64fbb4069d | 761 | * |
screamer | 0:7a64fbb4069d | 762 | * @param request_id identifies requests from 0 to (SNMP_CONCURRENT_REQUESTS-1) |
screamer | 0:7a64fbb4069d | 763 | */ |
screamer | 0:7a64fbb4069d | 764 | void |
screamer | 0:7a64fbb4069d | 765 | snmp_msg_event(u8_t request_id) |
screamer | 0:7a64fbb4069d | 766 | { |
screamer | 0:7a64fbb4069d | 767 | struct snmp_msg_pstat *msg_ps; |
screamer | 0:7a64fbb4069d | 768 | |
screamer | 0:7a64fbb4069d | 769 | if (request_id < SNMP_CONCURRENT_REQUESTS) |
screamer | 0:7a64fbb4069d | 770 | { |
screamer | 0:7a64fbb4069d | 771 | msg_ps = &msg_input_list[request_id]; |
screamer | 0:7a64fbb4069d | 772 | if (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ) |
screamer | 0:7a64fbb4069d | 773 | { |
screamer | 0:7a64fbb4069d | 774 | snmp_msg_getnext_event(request_id, msg_ps); |
screamer | 0:7a64fbb4069d | 775 | } |
screamer | 0:7a64fbb4069d | 776 | else if (msg_ps->rt == SNMP_ASN1_PDU_GET_REQ) |
screamer | 0:7a64fbb4069d | 777 | { |
screamer | 0:7a64fbb4069d | 778 | snmp_msg_get_event(request_id, msg_ps); |
screamer | 0:7a64fbb4069d | 779 | } |
screamer | 0:7a64fbb4069d | 780 | else if(msg_ps->rt == SNMP_ASN1_PDU_SET_REQ) |
screamer | 0:7a64fbb4069d | 781 | { |
screamer | 0:7a64fbb4069d | 782 | snmp_msg_set_event(request_id, msg_ps); |
screamer | 0:7a64fbb4069d | 783 | } |
screamer | 0:7a64fbb4069d | 784 | } |
screamer | 0:7a64fbb4069d | 785 | } |
screamer | 0:7a64fbb4069d | 786 | |
screamer | 0:7a64fbb4069d | 787 | |
screamer | 0:7a64fbb4069d | 788 | /* lwIP UDP receive callback function */ |
screamer | 0:7a64fbb4069d | 789 | static void |
screamer | 0:7a64fbb4069d | 790 | snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port) |
screamer | 0:7a64fbb4069d | 791 | { |
screamer | 0:7a64fbb4069d | 792 | struct udp_hdr *udphdr; |
screamer | 0:7a64fbb4069d | 793 | |
screamer | 0:7a64fbb4069d | 794 | /* suppress unused argument warning */ |
screamer | 0:7a64fbb4069d | 795 | LWIP_UNUSED_ARG(arg); |
screamer | 0:7a64fbb4069d | 796 | /* peek in the UDP header (goto IP payload) */ |
screamer | 0:7a64fbb4069d | 797 | if(pbuf_header(p, UDP_HLEN)){ |
screamer | 0:7a64fbb4069d | 798 | LWIP_ASSERT("Can't move to UDP header", 0); |
screamer | 0:7a64fbb4069d | 799 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 800 | return; |
screamer | 0:7a64fbb4069d | 801 | } |
screamer | 0:7a64fbb4069d | 802 | udphdr = p->payload; |
screamer | 0:7a64fbb4069d | 803 | |
screamer | 0:7a64fbb4069d | 804 | /* check if datagram is really directed at us (including broadcast requests) */ |
screamer | 0:7a64fbb4069d | 805 | if ((pcb == snmp1_pcb) && (ntohs(udphdr->dest) == SNMP_IN_PORT)) |
screamer | 0:7a64fbb4069d | 806 | { |
screamer | 0:7a64fbb4069d | 807 | struct snmp_msg_pstat *msg_ps; |
screamer | 0:7a64fbb4069d | 808 | u8_t req_idx; |
screamer | 0:7a64fbb4069d | 809 | |
screamer | 0:7a64fbb4069d | 810 | /* traverse input message process list, look for SNMP_MSG_EMPTY */ |
screamer | 0:7a64fbb4069d | 811 | msg_ps = &msg_input_list[0]; |
screamer | 0:7a64fbb4069d | 812 | req_idx = 0; |
screamer | 0:7a64fbb4069d | 813 | while ((req_idx<SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY)) |
screamer | 0:7a64fbb4069d | 814 | { |
screamer | 0:7a64fbb4069d | 815 | req_idx++; |
screamer | 0:7a64fbb4069d | 816 | msg_ps++; |
screamer | 0:7a64fbb4069d | 817 | } |
screamer | 0:7a64fbb4069d | 818 | if (req_idx != SNMP_CONCURRENT_REQUESTS) |
screamer | 0:7a64fbb4069d | 819 | { |
screamer | 0:7a64fbb4069d | 820 | err_t err_ret; |
screamer | 0:7a64fbb4069d | 821 | u16_t payload_len; |
screamer | 0:7a64fbb4069d | 822 | u16_t payload_ofs; |
screamer | 0:7a64fbb4069d | 823 | u16_t varbind_ofs = 0; |
screamer | 0:7a64fbb4069d | 824 | |
screamer | 0:7a64fbb4069d | 825 | /* accepting request */ |
screamer | 0:7a64fbb4069d | 826 | snmp_inc_snmpinpkts(); |
screamer | 0:7a64fbb4069d | 827 | /* record used 'protocol control block' */ |
screamer | 0:7a64fbb4069d | 828 | msg_ps->pcb = pcb; |
screamer | 0:7a64fbb4069d | 829 | /* source address (network order) */ |
screamer | 0:7a64fbb4069d | 830 | msg_ps->sip = *addr; |
screamer | 0:7a64fbb4069d | 831 | /* source port (host order (lwIP oddity)) */ |
screamer | 0:7a64fbb4069d | 832 | msg_ps->sp = port; |
screamer | 0:7a64fbb4069d | 833 | /* read UDP payload length from UDP header */ |
screamer | 0:7a64fbb4069d | 834 | payload_len = ntohs(udphdr->len) - UDP_HLEN; |
screamer | 0:7a64fbb4069d | 835 | |
screamer | 0:7a64fbb4069d | 836 | /* adjust to UDP payload */ |
screamer | 0:7a64fbb4069d | 837 | payload_ofs = UDP_HLEN; |
screamer | 0:7a64fbb4069d | 838 | |
screamer | 0:7a64fbb4069d | 839 | /* check total length, version, community, pdu type */ |
screamer | 0:7a64fbb4069d | 840 | err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps); |
screamer | 0:7a64fbb4069d | 841 | if (((msg_ps->rt == SNMP_ASN1_PDU_GET_REQ) || |
screamer | 0:7a64fbb4069d | 842 | (msg_ps->rt == SNMP_ASN1_PDU_GET_NEXT_REQ) || |
screamer | 0:7a64fbb4069d | 843 | (msg_ps->rt == SNMP_ASN1_PDU_SET_REQ)) && |
screamer | 0:7a64fbb4069d | 844 | ((msg_ps->error_status == SNMP_ES_NOERROR) && |
screamer | 0:7a64fbb4069d | 845 | (msg_ps->error_index == 0)) ) |
screamer | 0:7a64fbb4069d | 846 | { |
screamer | 0:7a64fbb4069d | 847 | /* Only accept requests and requests without error (be robust) */ |
screamer | 0:7a64fbb4069d | 848 | err_ret = err_ret; |
screamer | 0:7a64fbb4069d | 849 | } |
screamer | 0:7a64fbb4069d | 850 | else |
screamer | 0:7a64fbb4069d | 851 | { |
screamer | 0:7a64fbb4069d | 852 | /* Reject response and trap headers or error requests as input! */ |
screamer | 0:7a64fbb4069d | 853 | err_ret = ERR_ARG; |
screamer | 0:7a64fbb4069d | 854 | } |
screamer | 0:7a64fbb4069d | 855 | if (err_ret == ERR_OK) |
screamer | 0:7a64fbb4069d | 856 | { |
screamer | 0:7a64fbb4069d | 857 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community)); |
screamer | 0:7a64fbb4069d | 858 | |
screamer | 0:7a64fbb4069d | 859 | /* Builds a list of variable bindings. Copy the varbinds from the pbuf |
screamer | 0:7a64fbb4069d | 860 | chain to glue them when these are divided over two or more pbuf's. */ |
screamer | 0:7a64fbb4069d | 861 | err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps); |
screamer | 0:7a64fbb4069d | 862 | if ((err_ret == ERR_OK) && (msg_ps->invb.count > 0)) |
screamer | 0:7a64fbb4069d | 863 | { |
screamer | 0:7a64fbb4069d | 864 | /* we've decoded the incoming message, release input msg now */ |
screamer | 0:7a64fbb4069d | 865 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 866 | |
screamer | 0:7a64fbb4069d | 867 | msg_ps->error_status = SNMP_ES_NOERROR; |
screamer | 0:7a64fbb4069d | 868 | msg_ps->error_index = 0; |
screamer | 0:7a64fbb4069d | 869 | /* find object for each variable binding */ |
screamer | 0:7a64fbb4069d | 870 | msg_ps->state = SNMP_MSG_SEARCH_OBJ; |
screamer | 0:7a64fbb4069d | 871 | /* first variable binding from list to inspect */ |
screamer | 0:7a64fbb4069d | 872 | msg_ps->vb_idx = 0; |
screamer | 0:7a64fbb4069d | 873 | |
screamer | 0:7a64fbb4069d | 874 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count)); |
screamer | 0:7a64fbb4069d | 875 | |
screamer | 0:7a64fbb4069d | 876 | /* handle input event and as much objects as possible in one go */ |
screamer | 0:7a64fbb4069d | 877 | snmp_msg_event(req_idx); |
screamer | 0:7a64fbb4069d | 878 | } |
screamer | 0:7a64fbb4069d | 879 | else |
screamer | 0:7a64fbb4069d | 880 | { |
screamer | 0:7a64fbb4069d | 881 | /* varbind-list decode failed, or varbind list empty. |
screamer | 0:7a64fbb4069d | 882 | drop request silently, do not return error! |
screamer | 0:7a64fbb4069d | 883 | (errors are only returned for a specific varbind failure) */ |
screamer | 0:7a64fbb4069d | 884 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 885 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n")); |
screamer | 0:7a64fbb4069d | 886 | } |
screamer | 0:7a64fbb4069d | 887 | } |
screamer | 0:7a64fbb4069d | 888 | else |
screamer | 0:7a64fbb4069d | 889 | { |
screamer | 0:7a64fbb4069d | 890 | /* header check failed |
screamer | 0:7a64fbb4069d | 891 | drop request silently, do not return error! */ |
screamer | 0:7a64fbb4069d | 892 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 893 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n")); |
screamer | 0:7a64fbb4069d | 894 | } |
screamer | 0:7a64fbb4069d | 895 | } |
screamer | 0:7a64fbb4069d | 896 | else |
screamer | 0:7a64fbb4069d | 897 | { |
screamer | 0:7a64fbb4069d | 898 | /* exceeding number of concurrent requests */ |
screamer | 0:7a64fbb4069d | 899 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 900 | } |
screamer | 0:7a64fbb4069d | 901 | } |
screamer | 0:7a64fbb4069d | 902 | else |
screamer | 0:7a64fbb4069d | 903 | { |
screamer | 0:7a64fbb4069d | 904 | /* datagram not for us */ |
screamer | 0:7a64fbb4069d | 905 | pbuf_free(p); |
screamer | 0:7a64fbb4069d | 906 | } |
screamer | 0:7a64fbb4069d | 907 | } |
screamer | 0:7a64fbb4069d | 908 | |
screamer | 0:7a64fbb4069d | 909 | /** |
screamer | 0:7a64fbb4069d | 910 | * Checks and decodes incoming SNMP message header, logs header errors. |
screamer | 0:7a64fbb4069d | 911 | * |
screamer | 0:7a64fbb4069d | 912 | * @param p points to pbuf chain of SNMP message (UDP payload) |
screamer | 0:7a64fbb4069d | 913 | * @param ofs points to first octet of SNMP message |
screamer | 0:7a64fbb4069d | 914 | * @param pdu_len the length of the UDP payload |
screamer | 0:7a64fbb4069d | 915 | * @param ofs_ret returns the ofset of the variable bindings |
screamer | 0:7a64fbb4069d | 916 | * @param m_stat points to the current message request state return |
screamer | 0:7a64fbb4069d | 917 | * @return |
screamer | 0:7a64fbb4069d | 918 | * - ERR_OK SNMP header is sane and accepted |
screamer | 0:7a64fbb4069d | 919 | * - ERR_ARG SNMP header is either malformed or rejected |
screamer | 0:7a64fbb4069d | 920 | */ |
screamer | 0:7a64fbb4069d | 921 | static err_t |
screamer | 0:7a64fbb4069d | 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) |
screamer | 0:7a64fbb4069d | 923 | { |
screamer | 0:7a64fbb4069d | 924 | err_t derr; |
screamer | 0:7a64fbb4069d | 925 | u16_t len, ofs_base; |
screamer | 0:7a64fbb4069d | 926 | u8_t len_octets; |
screamer | 0:7a64fbb4069d | 927 | u8_t type; |
screamer | 0:7a64fbb4069d | 928 | s32_t version; |
screamer | 0:7a64fbb4069d | 929 | |
screamer | 0:7a64fbb4069d | 930 | ofs_base = ofs; |
screamer | 0:7a64fbb4069d | 931 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 932 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 933 | if ((derr != ERR_OK) || |
screamer | 0:7a64fbb4069d | 934 | (pdu_len != (1 + len_octets + len)) || |
screamer | 0:7a64fbb4069d | 935 | (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ))) |
screamer | 0:7a64fbb4069d | 936 | { |
screamer | 0:7a64fbb4069d | 937 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 938 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 939 | } |
screamer | 0:7a64fbb4069d | 940 | ofs += (1 + len_octets); |
screamer | 0:7a64fbb4069d | 941 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 942 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 943 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG))) |
screamer | 0:7a64fbb4069d | 944 | { |
screamer | 0:7a64fbb4069d | 945 | /* can't decode or no integer (version) */ |
screamer | 0:7a64fbb4069d | 946 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 947 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 948 | } |
screamer | 0:7a64fbb4069d | 949 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &version); |
screamer | 0:7a64fbb4069d | 950 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 951 | { |
screamer | 0:7a64fbb4069d | 952 | /* can't decode */ |
screamer | 0:7a64fbb4069d | 953 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 954 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 955 | } |
screamer | 0:7a64fbb4069d | 956 | if (version != 0) |
screamer | 0:7a64fbb4069d | 957 | { |
screamer | 0:7a64fbb4069d | 958 | /* not version 1 */ |
screamer | 0:7a64fbb4069d | 959 | snmp_inc_snmpinbadversions(); |
screamer | 0:7a64fbb4069d | 960 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 961 | } |
screamer | 0:7a64fbb4069d | 962 | ofs += (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 963 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 964 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 965 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR))) |
screamer | 0:7a64fbb4069d | 966 | { |
screamer | 0:7a64fbb4069d | 967 | /* can't decode or no octet string (community) */ |
screamer | 0:7a64fbb4069d | 968 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 969 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 970 | } |
screamer | 0:7a64fbb4069d | 971 | derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, SNMP_COMMUNITY_STR_LEN, m_stat->community); |
screamer | 0:7a64fbb4069d | 972 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 973 | { |
screamer | 0:7a64fbb4069d | 974 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 975 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 976 | } |
screamer | 0:7a64fbb4069d | 977 | /* add zero terminator */ |
screamer | 0:7a64fbb4069d | 978 | len = ((len < (SNMP_COMMUNITY_STR_LEN))?(len):(SNMP_COMMUNITY_STR_LEN)); |
screamer | 0:7a64fbb4069d | 979 | m_stat->community[len] = 0; |
screamer | 0:7a64fbb4069d | 980 | m_stat->com_strlen = len; |
screamer | 0:7a64fbb4069d | 981 | if (strncmp(snmp_publiccommunity, (const char*)m_stat->community, SNMP_COMMUNITY_STR_LEN) != 0) |
screamer | 0:7a64fbb4069d | 982 | { |
screamer | 0:7a64fbb4069d | 983 | /** @todo: move this if we need to check more names */ |
screamer | 0:7a64fbb4069d | 984 | snmp_inc_snmpinbadcommunitynames(); |
screamer | 0:7a64fbb4069d | 985 | snmp_authfail_trap(); |
screamer | 0:7a64fbb4069d | 986 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 987 | } |
screamer | 0:7a64fbb4069d | 988 | ofs += (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 989 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 990 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 991 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 992 | { |
screamer | 0:7a64fbb4069d | 993 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 994 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 995 | } |
screamer | 0:7a64fbb4069d | 996 | switch(type) |
screamer | 0:7a64fbb4069d | 997 | { |
screamer | 0:7a64fbb4069d | 998 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_REQ): |
screamer | 0:7a64fbb4069d | 999 | /* GetRequest PDU */ |
screamer | 0:7a64fbb4069d | 1000 | snmp_inc_snmpingetrequests(); |
screamer | 0:7a64fbb4069d | 1001 | derr = ERR_OK; |
screamer | 0:7a64fbb4069d | 1002 | break; |
screamer | 0:7a64fbb4069d | 1003 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_NEXT_REQ): |
screamer | 0:7a64fbb4069d | 1004 | /* GetNextRequest PDU */ |
screamer | 0:7a64fbb4069d | 1005 | snmp_inc_snmpingetnexts(); |
screamer | 0:7a64fbb4069d | 1006 | derr = ERR_OK; |
screamer | 0:7a64fbb4069d | 1007 | break; |
screamer | 0:7a64fbb4069d | 1008 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP): |
screamer | 0:7a64fbb4069d | 1009 | /* GetResponse PDU */ |
screamer | 0:7a64fbb4069d | 1010 | snmp_inc_snmpingetresponses(); |
screamer | 0:7a64fbb4069d | 1011 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1012 | break; |
screamer | 0:7a64fbb4069d | 1013 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_SET_REQ): |
screamer | 0:7a64fbb4069d | 1014 | /* SetRequest PDU */ |
screamer | 0:7a64fbb4069d | 1015 | snmp_inc_snmpinsetrequests(); |
screamer | 0:7a64fbb4069d | 1016 | derr = ERR_OK; |
screamer | 0:7a64fbb4069d | 1017 | break; |
screamer | 0:7a64fbb4069d | 1018 | case (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP): |
screamer | 0:7a64fbb4069d | 1019 | /* Trap PDU */ |
screamer | 0:7a64fbb4069d | 1020 | snmp_inc_snmpintraps(); |
screamer | 0:7a64fbb4069d | 1021 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1022 | break; |
screamer | 0:7a64fbb4069d | 1023 | default: |
screamer | 0:7a64fbb4069d | 1024 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1025 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1026 | break; |
screamer | 0:7a64fbb4069d | 1027 | } |
screamer | 0:7a64fbb4069d | 1028 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 1029 | { |
screamer | 0:7a64fbb4069d | 1030 | /* unsupported input PDU for this agent (no parse error) */ |
screamer | 0:7a64fbb4069d | 1031 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1032 | } |
screamer | 0:7a64fbb4069d | 1033 | m_stat->rt = type & 0x1F; |
screamer | 0:7a64fbb4069d | 1034 | ofs += (1 + len_octets); |
screamer | 0:7a64fbb4069d | 1035 | if (len != (pdu_len - (ofs - ofs_base))) |
screamer | 0:7a64fbb4069d | 1036 | { |
screamer | 0:7a64fbb4069d | 1037 | /* decoded PDU length does not equal actual payload length */ |
screamer | 0:7a64fbb4069d | 1038 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1039 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1040 | } |
screamer | 0:7a64fbb4069d | 1041 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 1042 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 1043 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG))) |
screamer | 0:7a64fbb4069d | 1044 | { |
screamer | 0:7a64fbb4069d | 1045 | /* can't decode or no integer (request ID) */ |
screamer | 0:7a64fbb4069d | 1046 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1047 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1048 | } |
screamer | 0:7a64fbb4069d | 1049 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->rid); |
screamer | 0:7a64fbb4069d | 1050 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 1051 | { |
screamer | 0:7a64fbb4069d | 1052 | /* can't decode */ |
screamer | 0:7a64fbb4069d | 1053 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1054 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1055 | } |
screamer | 0:7a64fbb4069d | 1056 | ofs += (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 1057 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 1058 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 1059 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG))) |
screamer | 0:7a64fbb4069d | 1060 | { |
screamer | 0:7a64fbb4069d | 1061 | /* can't decode or no integer (error-status) */ |
screamer | 0:7a64fbb4069d | 1062 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1063 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1064 | } |
screamer | 0:7a64fbb4069d | 1065 | /* must be noError (0) for incoming requests. |
screamer | 0:7a64fbb4069d | 1066 | log errors for mib-2 completeness and for debug purposes */ |
screamer | 0:7a64fbb4069d | 1067 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_status); |
screamer | 0:7a64fbb4069d | 1068 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 1069 | { |
screamer | 0:7a64fbb4069d | 1070 | /* can't decode */ |
screamer | 0:7a64fbb4069d | 1071 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1072 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1073 | } |
screamer | 0:7a64fbb4069d | 1074 | switch (m_stat->error_status) |
screamer | 0:7a64fbb4069d | 1075 | { |
screamer | 0:7a64fbb4069d | 1076 | case SNMP_ES_TOOBIG: |
screamer | 0:7a64fbb4069d | 1077 | snmp_inc_snmpintoobigs(); |
screamer | 0:7a64fbb4069d | 1078 | break; |
screamer | 0:7a64fbb4069d | 1079 | case SNMP_ES_NOSUCHNAME: |
screamer | 0:7a64fbb4069d | 1080 | snmp_inc_snmpinnosuchnames(); |
screamer | 0:7a64fbb4069d | 1081 | break; |
screamer | 0:7a64fbb4069d | 1082 | case SNMP_ES_BADVALUE: |
screamer | 0:7a64fbb4069d | 1083 | snmp_inc_snmpinbadvalues(); |
screamer | 0:7a64fbb4069d | 1084 | break; |
screamer | 0:7a64fbb4069d | 1085 | case SNMP_ES_READONLY: |
screamer | 0:7a64fbb4069d | 1086 | snmp_inc_snmpinreadonlys(); |
screamer | 0:7a64fbb4069d | 1087 | break; |
screamer | 0:7a64fbb4069d | 1088 | case SNMP_ES_GENERROR: |
screamer | 0:7a64fbb4069d | 1089 | snmp_inc_snmpingenerrs(); |
screamer | 0:7a64fbb4069d | 1090 | break; |
screamer | 0:7a64fbb4069d | 1091 | } |
screamer | 0:7a64fbb4069d | 1092 | ofs += (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 1093 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 1094 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 1095 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG))) |
screamer | 0:7a64fbb4069d | 1096 | { |
screamer | 0:7a64fbb4069d | 1097 | /* can't decode or no integer (error-index) */ |
screamer | 0:7a64fbb4069d | 1098 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1099 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1100 | } |
screamer | 0:7a64fbb4069d | 1101 | /* must be 0 for incoming requests. |
screamer | 0:7a64fbb4069d | 1102 | decode anyway to catch bad integers (and dirty tricks) */ |
screamer | 0:7a64fbb4069d | 1103 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, &m_stat->error_index); |
screamer | 0:7a64fbb4069d | 1104 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 1105 | { |
screamer | 0:7a64fbb4069d | 1106 | /* can't decode */ |
screamer | 0:7a64fbb4069d | 1107 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1108 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1109 | } |
screamer | 0:7a64fbb4069d | 1110 | ofs += (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 1111 | *ofs_ret = ofs; |
screamer | 0:7a64fbb4069d | 1112 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 1113 | } |
screamer | 0:7a64fbb4069d | 1114 | |
screamer | 0:7a64fbb4069d | 1115 | static err_t |
screamer | 0:7a64fbb4069d | 1116 | snmp_pdu_dec_varbindlist(struct pbuf *p, u16_t ofs, u16_t *ofs_ret, struct snmp_msg_pstat *m_stat) |
screamer | 0:7a64fbb4069d | 1117 | { |
screamer | 0:7a64fbb4069d | 1118 | err_t derr; |
screamer | 0:7a64fbb4069d | 1119 | u16_t len, vb_len; |
screamer | 0:7a64fbb4069d | 1120 | u8_t len_octets; |
screamer | 0:7a64fbb4069d | 1121 | u8_t type; |
screamer | 0:7a64fbb4069d | 1122 | |
screamer | 0:7a64fbb4069d | 1123 | /* variable binding list */ |
screamer | 0:7a64fbb4069d | 1124 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 1125 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &vb_len); |
screamer | 0:7a64fbb4069d | 1126 | if ((derr != ERR_OK) || |
screamer | 0:7a64fbb4069d | 1127 | (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ))) |
screamer | 0:7a64fbb4069d | 1128 | { |
screamer | 0:7a64fbb4069d | 1129 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1130 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1131 | } |
screamer | 0:7a64fbb4069d | 1132 | ofs += (1 + len_octets); |
screamer | 0:7a64fbb4069d | 1133 | |
screamer | 0:7a64fbb4069d | 1134 | /* start with empty list */ |
screamer | 0:7a64fbb4069d | 1135 | m_stat->invb.count = 0; |
screamer | 0:7a64fbb4069d | 1136 | m_stat->invb.head = NULL; |
screamer | 0:7a64fbb4069d | 1137 | m_stat->invb.tail = NULL; |
screamer | 0:7a64fbb4069d | 1138 | |
screamer | 0:7a64fbb4069d | 1139 | while (vb_len > 0) |
screamer | 0:7a64fbb4069d | 1140 | { |
screamer | 0:7a64fbb4069d | 1141 | struct snmp_obj_id oid, oid_value; |
screamer | 0:7a64fbb4069d | 1142 | struct snmp_varbind *vb; |
screamer | 0:7a64fbb4069d | 1143 | |
screamer | 0:7a64fbb4069d | 1144 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 1145 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 1146 | if ((derr != ERR_OK) || |
screamer | 0:7a64fbb4069d | 1147 | (type != (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ)) || |
screamer | 0:7a64fbb4069d | 1148 | (len == 0) || (len > vb_len)) |
screamer | 0:7a64fbb4069d | 1149 | { |
screamer | 0:7a64fbb4069d | 1150 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1151 | /* free varbinds (if available) */ |
screamer | 0:7a64fbb4069d | 1152 | snmp_varbind_list_free(&m_stat->invb); |
screamer | 0:7a64fbb4069d | 1153 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1154 | } |
screamer | 0:7a64fbb4069d | 1155 | ofs += (1 + len_octets); |
screamer | 0:7a64fbb4069d | 1156 | vb_len -= (1 + len_octets); |
screamer | 0:7a64fbb4069d | 1157 | |
screamer | 0:7a64fbb4069d | 1158 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 1159 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 1160 | if ((derr != ERR_OK) || (type != (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID))) |
screamer | 0:7a64fbb4069d | 1161 | { |
screamer | 0:7a64fbb4069d | 1162 | /* can't decode object name length */ |
screamer | 0:7a64fbb4069d | 1163 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1164 | /* free varbinds (if available) */ |
screamer | 0:7a64fbb4069d | 1165 | snmp_varbind_list_free(&m_stat->invb); |
screamer | 0:7a64fbb4069d | 1166 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1167 | } |
screamer | 0:7a64fbb4069d | 1168 | derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid); |
screamer | 0:7a64fbb4069d | 1169 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 1170 | { |
screamer | 0:7a64fbb4069d | 1171 | /* can't decode object name */ |
screamer | 0:7a64fbb4069d | 1172 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1173 | /* free varbinds (if available) */ |
screamer | 0:7a64fbb4069d | 1174 | snmp_varbind_list_free(&m_stat->invb); |
screamer | 0:7a64fbb4069d | 1175 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1176 | } |
screamer | 0:7a64fbb4069d | 1177 | ofs += (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 1178 | vb_len -= (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 1179 | |
screamer | 0:7a64fbb4069d | 1180 | snmp_asn1_dec_type(p, ofs, &type); |
screamer | 0:7a64fbb4069d | 1181 | derr = snmp_asn1_dec_length(p, ofs+1, &len_octets, &len); |
screamer | 0:7a64fbb4069d | 1182 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 1183 | { |
screamer | 0:7a64fbb4069d | 1184 | /* can't decode object value length */ |
screamer | 0:7a64fbb4069d | 1185 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1186 | /* free varbinds (if available) */ |
screamer | 0:7a64fbb4069d | 1187 | snmp_varbind_list_free(&m_stat->invb); |
screamer | 0:7a64fbb4069d | 1188 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1189 | } |
screamer | 0:7a64fbb4069d | 1190 | |
screamer | 0:7a64fbb4069d | 1191 | switch (type) |
screamer | 0:7a64fbb4069d | 1192 | { |
screamer | 0:7a64fbb4069d | 1193 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG): |
screamer | 0:7a64fbb4069d | 1194 | vb = snmp_varbind_alloc(&oid, type, sizeof(s32_t)); |
screamer | 0:7a64fbb4069d | 1195 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 1196 | { |
screamer | 0:7a64fbb4069d | 1197 | s32_t *vptr = vb->value; |
screamer | 0:7a64fbb4069d | 1198 | |
screamer | 0:7a64fbb4069d | 1199 | derr = snmp_asn1_dec_s32t(p, ofs + 1 + len_octets, len, vptr); |
screamer | 0:7a64fbb4069d | 1200 | snmp_varbind_tail_add(&m_stat->invb, vb); |
screamer | 0:7a64fbb4069d | 1201 | } |
screamer | 0:7a64fbb4069d | 1202 | else |
screamer | 0:7a64fbb4069d | 1203 | { |
screamer | 0:7a64fbb4069d | 1204 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1205 | } |
screamer | 0:7a64fbb4069d | 1206 | break; |
screamer | 0:7a64fbb4069d | 1207 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER): |
screamer | 0:7a64fbb4069d | 1208 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE): |
screamer | 0:7a64fbb4069d | 1209 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS): |
screamer | 0:7a64fbb4069d | 1210 | vb = snmp_varbind_alloc(&oid, type, sizeof(u32_t)); |
screamer | 0:7a64fbb4069d | 1211 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 1212 | { |
screamer | 0:7a64fbb4069d | 1213 | u32_t *vptr = vb->value; |
screamer | 0:7a64fbb4069d | 1214 | |
screamer | 0:7a64fbb4069d | 1215 | derr = snmp_asn1_dec_u32t(p, ofs + 1 + len_octets, len, vptr); |
screamer | 0:7a64fbb4069d | 1216 | snmp_varbind_tail_add(&m_stat->invb, vb); |
screamer | 0:7a64fbb4069d | 1217 | } |
screamer | 0:7a64fbb4069d | 1218 | else |
screamer | 0:7a64fbb4069d | 1219 | { |
screamer | 0:7a64fbb4069d | 1220 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1221 | } |
screamer | 0:7a64fbb4069d | 1222 | break; |
screamer | 0:7a64fbb4069d | 1223 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR): |
screamer | 0:7a64fbb4069d | 1224 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE): |
screamer | 0:7a64fbb4069d | 1225 | vb = snmp_varbind_alloc(&oid, type, len); |
screamer | 0:7a64fbb4069d | 1226 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 1227 | { |
screamer | 0:7a64fbb4069d | 1228 | derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, vb->value); |
screamer | 0:7a64fbb4069d | 1229 | snmp_varbind_tail_add(&m_stat->invb, vb); |
screamer | 0:7a64fbb4069d | 1230 | } |
screamer | 0:7a64fbb4069d | 1231 | else |
screamer | 0:7a64fbb4069d | 1232 | { |
screamer | 0:7a64fbb4069d | 1233 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1234 | } |
screamer | 0:7a64fbb4069d | 1235 | break; |
screamer | 0:7a64fbb4069d | 1236 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL): |
screamer | 0:7a64fbb4069d | 1237 | vb = snmp_varbind_alloc(&oid, type, 0); |
screamer | 0:7a64fbb4069d | 1238 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 1239 | { |
screamer | 0:7a64fbb4069d | 1240 | snmp_varbind_tail_add(&m_stat->invb, vb); |
screamer | 0:7a64fbb4069d | 1241 | derr = ERR_OK; |
screamer | 0:7a64fbb4069d | 1242 | } |
screamer | 0:7a64fbb4069d | 1243 | else |
screamer | 0:7a64fbb4069d | 1244 | { |
screamer | 0:7a64fbb4069d | 1245 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1246 | } |
screamer | 0:7a64fbb4069d | 1247 | break; |
screamer | 0:7a64fbb4069d | 1248 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID): |
screamer | 0:7a64fbb4069d | 1249 | derr = snmp_asn1_dec_oid(p, ofs + 1 + len_octets, len, &oid_value); |
screamer | 0:7a64fbb4069d | 1250 | if (derr == ERR_OK) |
screamer | 0:7a64fbb4069d | 1251 | { |
screamer | 0:7a64fbb4069d | 1252 | vb = snmp_varbind_alloc(&oid, type, oid_value.len * sizeof(s32_t)); |
screamer | 0:7a64fbb4069d | 1253 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 1254 | { |
screamer | 0:7a64fbb4069d | 1255 | u8_t i = oid_value.len; |
screamer | 0:7a64fbb4069d | 1256 | s32_t *vptr = vb->value; |
screamer | 0:7a64fbb4069d | 1257 | |
screamer | 0:7a64fbb4069d | 1258 | while(i > 0) |
screamer | 0:7a64fbb4069d | 1259 | { |
screamer | 0:7a64fbb4069d | 1260 | i--; |
screamer | 0:7a64fbb4069d | 1261 | vptr[i] = oid_value.id[i]; |
screamer | 0:7a64fbb4069d | 1262 | } |
screamer | 0:7a64fbb4069d | 1263 | snmp_varbind_tail_add(&m_stat->invb, vb); |
screamer | 0:7a64fbb4069d | 1264 | derr = ERR_OK; |
screamer | 0:7a64fbb4069d | 1265 | } |
screamer | 0:7a64fbb4069d | 1266 | else |
screamer | 0:7a64fbb4069d | 1267 | { |
screamer | 0:7a64fbb4069d | 1268 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1269 | } |
screamer | 0:7a64fbb4069d | 1270 | } |
screamer | 0:7a64fbb4069d | 1271 | break; |
screamer | 0:7a64fbb4069d | 1272 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR): |
screamer | 0:7a64fbb4069d | 1273 | if (len == 4) |
screamer | 0:7a64fbb4069d | 1274 | { |
screamer | 0:7a64fbb4069d | 1275 | /* must be exactly 4 octets! */ |
screamer | 0:7a64fbb4069d | 1276 | vb = snmp_varbind_alloc(&oid, type, 4); |
screamer | 0:7a64fbb4069d | 1277 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 1278 | { |
screamer | 0:7a64fbb4069d | 1279 | derr = snmp_asn1_dec_raw(p, ofs + 1 + len_octets, len, vb->value_len, vb->value); |
screamer | 0:7a64fbb4069d | 1280 | snmp_varbind_tail_add(&m_stat->invb, vb); |
screamer | 0:7a64fbb4069d | 1281 | } |
screamer | 0:7a64fbb4069d | 1282 | else |
screamer | 0:7a64fbb4069d | 1283 | { |
screamer | 0:7a64fbb4069d | 1284 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1285 | } |
screamer | 0:7a64fbb4069d | 1286 | } |
screamer | 0:7a64fbb4069d | 1287 | else |
screamer | 0:7a64fbb4069d | 1288 | { |
screamer | 0:7a64fbb4069d | 1289 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1290 | } |
screamer | 0:7a64fbb4069d | 1291 | break; |
screamer | 0:7a64fbb4069d | 1292 | default: |
screamer | 0:7a64fbb4069d | 1293 | derr = ERR_ARG; |
screamer | 0:7a64fbb4069d | 1294 | break; |
screamer | 0:7a64fbb4069d | 1295 | } |
screamer | 0:7a64fbb4069d | 1296 | if (derr != ERR_OK) |
screamer | 0:7a64fbb4069d | 1297 | { |
screamer | 0:7a64fbb4069d | 1298 | snmp_inc_snmpinasnparseerrs(); |
screamer | 0:7a64fbb4069d | 1299 | /* free varbinds (if available) */ |
screamer | 0:7a64fbb4069d | 1300 | snmp_varbind_list_free(&m_stat->invb); |
screamer | 0:7a64fbb4069d | 1301 | return ERR_ARG; |
screamer | 0:7a64fbb4069d | 1302 | } |
screamer | 0:7a64fbb4069d | 1303 | ofs += (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 1304 | vb_len -= (1 + len_octets + len); |
screamer | 0:7a64fbb4069d | 1305 | } |
screamer | 0:7a64fbb4069d | 1306 | |
screamer | 0:7a64fbb4069d | 1307 | if (m_stat->rt == SNMP_ASN1_PDU_SET_REQ) |
screamer | 0:7a64fbb4069d | 1308 | { |
screamer | 0:7a64fbb4069d | 1309 | snmp_add_snmpintotalsetvars(m_stat->invb.count); |
screamer | 0:7a64fbb4069d | 1310 | } |
screamer | 0:7a64fbb4069d | 1311 | else |
screamer | 0:7a64fbb4069d | 1312 | { |
screamer | 0:7a64fbb4069d | 1313 | snmp_add_snmpintotalreqvars(m_stat->invb.count); |
screamer | 0:7a64fbb4069d | 1314 | } |
screamer | 0:7a64fbb4069d | 1315 | |
screamer | 0:7a64fbb4069d | 1316 | *ofs_ret = ofs; |
screamer | 0:7a64fbb4069d | 1317 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 1318 | } |
screamer | 0:7a64fbb4069d | 1319 | |
screamer | 0:7a64fbb4069d | 1320 | struct snmp_varbind* |
screamer | 0:7a64fbb4069d | 1321 | snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len) |
screamer | 0:7a64fbb4069d | 1322 | { |
screamer | 0:7a64fbb4069d | 1323 | struct snmp_varbind *vb; |
screamer | 0:7a64fbb4069d | 1324 | |
screamer | 0:7a64fbb4069d | 1325 | vb = (struct snmp_varbind *)mem_malloc(sizeof(struct snmp_varbind)); |
screamer | 0:7a64fbb4069d | 1326 | LWIP_ASSERT("vb != NULL",vb != NULL); |
screamer | 0:7a64fbb4069d | 1327 | if (vb != NULL) |
screamer | 0:7a64fbb4069d | 1328 | { |
screamer | 0:7a64fbb4069d | 1329 | u8_t i; |
screamer | 0:7a64fbb4069d | 1330 | |
screamer | 0:7a64fbb4069d | 1331 | vb->next = NULL; |
screamer | 0:7a64fbb4069d | 1332 | vb->prev = NULL; |
screamer | 0:7a64fbb4069d | 1333 | i = oid->len; |
screamer | 0:7a64fbb4069d | 1334 | vb->ident_len = i; |
screamer | 0:7a64fbb4069d | 1335 | if (i > 0) |
screamer | 0:7a64fbb4069d | 1336 | { |
screamer | 0:7a64fbb4069d | 1337 | /* allocate array of s32_t for our object identifier */ |
screamer | 0:7a64fbb4069d | 1338 | vb->ident = (s32_t*)mem_malloc(sizeof(s32_t) * i); |
screamer | 0:7a64fbb4069d | 1339 | LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL); |
screamer | 0:7a64fbb4069d | 1340 | if (vb->ident == NULL) |
screamer | 0:7a64fbb4069d | 1341 | { |
screamer | 0:7a64fbb4069d | 1342 | mem_free(vb); |
screamer | 0:7a64fbb4069d | 1343 | return NULL; |
screamer | 0:7a64fbb4069d | 1344 | } |
screamer | 0:7a64fbb4069d | 1345 | while(i > 0) |
screamer | 0:7a64fbb4069d | 1346 | { |
screamer | 0:7a64fbb4069d | 1347 | i--; |
screamer | 0:7a64fbb4069d | 1348 | vb->ident[i] = oid->id[i]; |
screamer | 0:7a64fbb4069d | 1349 | } |
screamer | 0:7a64fbb4069d | 1350 | } |
screamer | 0:7a64fbb4069d | 1351 | else |
screamer | 0:7a64fbb4069d | 1352 | { |
screamer | 0:7a64fbb4069d | 1353 | /* i == 0, pass zero length object identifier */ |
screamer | 0:7a64fbb4069d | 1354 | vb->ident = NULL; |
screamer | 0:7a64fbb4069d | 1355 | } |
screamer | 0:7a64fbb4069d | 1356 | vb->value_type = type; |
screamer | 0:7a64fbb4069d | 1357 | vb->value_len = len; |
screamer | 0:7a64fbb4069d | 1358 | if (len > 0) |
screamer | 0:7a64fbb4069d | 1359 | { |
screamer | 0:7a64fbb4069d | 1360 | /* allocate raw bytes for our object value */ |
screamer | 0:7a64fbb4069d | 1361 | vb->value = mem_malloc(len); |
screamer | 0:7a64fbb4069d | 1362 | LWIP_ASSERT("vb->value != NULL",vb->value != NULL); |
screamer | 0:7a64fbb4069d | 1363 | if (vb->value == NULL) |
screamer | 0:7a64fbb4069d | 1364 | { |
screamer | 0:7a64fbb4069d | 1365 | if (vb->ident != NULL) |
screamer | 0:7a64fbb4069d | 1366 | { |
screamer | 0:7a64fbb4069d | 1367 | mem_free(vb->ident); |
screamer | 0:7a64fbb4069d | 1368 | } |
screamer | 0:7a64fbb4069d | 1369 | mem_free(vb); |
screamer | 0:7a64fbb4069d | 1370 | return NULL; |
screamer | 0:7a64fbb4069d | 1371 | } |
screamer | 0:7a64fbb4069d | 1372 | } |
screamer | 0:7a64fbb4069d | 1373 | else |
screamer | 0:7a64fbb4069d | 1374 | { |
screamer | 0:7a64fbb4069d | 1375 | /* ASN1_NUL type, or zero length ASN1_OC_STR */ |
screamer | 0:7a64fbb4069d | 1376 | vb->value = NULL; |
screamer | 0:7a64fbb4069d | 1377 | } |
screamer | 0:7a64fbb4069d | 1378 | } |
screamer | 0:7a64fbb4069d | 1379 | return vb; |
screamer | 0:7a64fbb4069d | 1380 | } |
screamer | 0:7a64fbb4069d | 1381 | |
screamer | 0:7a64fbb4069d | 1382 | void |
screamer | 0:7a64fbb4069d | 1383 | snmp_varbind_free(struct snmp_varbind *vb) |
screamer | 0:7a64fbb4069d | 1384 | { |
screamer | 0:7a64fbb4069d | 1385 | if (vb->value != NULL ) |
screamer | 0:7a64fbb4069d | 1386 | { |
screamer | 0:7a64fbb4069d | 1387 | mem_free(vb->value); |
screamer | 0:7a64fbb4069d | 1388 | } |
screamer | 0:7a64fbb4069d | 1389 | if (vb->ident != NULL ) |
screamer | 0:7a64fbb4069d | 1390 | { |
screamer | 0:7a64fbb4069d | 1391 | mem_free(vb->ident); |
screamer | 0:7a64fbb4069d | 1392 | } |
screamer | 0:7a64fbb4069d | 1393 | mem_free(vb); |
screamer | 0:7a64fbb4069d | 1394 | } |
screamer | 0:7a64fbb4069d | 1395 | |
screamer | 0:7a64fbb4069d | 1396 | void |
screamer | 0:7a64fbb4069d | 1397 | snmp_varbind_list_free(struct snmp_varbind_root *root) |
screamer | 0:7a64fbb4069d | 1398 | { |
screamer | 0:7a64fbb4069d | 1399 | struct snmp_varbind *vb, *prev; |
screamer | 0:7a64fbb4069d | 1400 | |
screamer | 0:7a64fbb4069d | 1401 | vb = root->tail; |
screamer | 0:7a64fbb4069d | 1402 | while ( vb != NULL ) |
screamer | 0:7a64fbb4069d | 1403 | { |
screamer | 0:7a64fbb4069d | 1404 | prev = vb->prev; |
screamer | 0:7a64fbb4069d | 1405 | snmp_varbind_free(vb); |
screamer | 0:7a64fbb4069d | 1406 | vb = prev; |
screamer | 0:7a64fbb4069d | 1407 | } |
screamer | 0:7a64fbb4069d | 1408 | root->count = 0; |
screamer | 0:7a64fbb4069d | 1409 | root->head = NULL; |
screamer | 0:7a64fbb4069d | 1410 | root->tail = NULL; |
screamer | 0:7a64fbb4069d | 1411 | } |
screamer | 0:7a64fbb4069d | 1412 | |
screamer | 0:7a64fbb4069d | 1413 | void |
screamer | 0:7a64fbb4069d | 1414 | snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb) |
screamer | 0:7a64fbb4069d | 1415 | { |
screamer | 0:7a64fbb4069d | 1416 | if (root->count == 0) |
screamer | 0:7a64fbb4069d | 1417 | { |
screamer | 0:7a64fbb4069d | 1418 | /* add first varbind to list */ |
screamer | 0:7a64fbb4069d | 1419 | root->head = vb; |
screamer | 0:7a64fbb4069d | 1420 | root->tail = vb; |
screamer | 0:7a64fbb4069d | 1421 | } |
screamer | 0:7a64fbb4069d | 1422 | else |
screamer | 0:7a64fbb4069d | 1423 | { |
screamer | 0:7a64fbb4069d | 1424 | /* add nth varbind to list tail */ |
screamer | 0:7a64fbb4069d | 1425 | root->tail->next = vb; |
screamer | 0:7a64fbb4069d | 1426 | vb->prev = root->tail; |
screamer | 0:7a64fbb4069d | 1427 | root->tail = vb; |
screamer | 0:7a64fbb4069d | 1428 | } |
screamer | 0:7a64fbb4069d | 1429 | root->count += 1; |
screamer | 0:7a64fbb4069d | 1430 | } |
screamer | 0:7a64fbb4069d | 1431 | |
screamer | 0:7a64fbb4069d | 1432 | struct snmp_varbind* |
screamer | 0:7a64fbb4069d | 1433 | snmp_varbind_tail_remove(struct snmp_varbind_root *root) |
screamer | 0:7a64fbb4069d | 1434 | { |
screamer | 0:7a64fbb4069d | 1435 | struct snmp_varbind* vb; |
screamer | 0:7a64fbb4069d | 1436 | |
screamer | 0:7a64fbb4069d | 1437 | if (root->count > 0) |
screamer | 0:7a64fbb4069d | 1438 | { |
screamer | 0:7a64fbb4069d | 1439 | /* remove tail varbind */ |
screamer | 0:7a64fbb4069d | 1440 | vb = root->tail; |
screamer | 0:7a64fbb4069d | 1441 | root->tail = vb->prev; |
screamer | 0:7a64fbb4069d | 1442 | vb->prev->next = NULL; |
screamer | 0:7a64fbb4069d | 1443 | root->count -= 1; |
screamer | 0:7a64fbb4069d | 1444 | } |
screamer | 0:7a64fbb4069d | 1445 | else |
screamer | 0:7a64fbb4069d | 1446 | { |
screamer | 0:7a64fbb4069d | 1447 | /* nothing to remove */ |
screamer | 0:7a64fbb4069d | 1448 | vb = NULL; |
screamer | 0:7a64fbb4069d | 1449 | } |
screamer | 0:7a64fbb4069d | 1450 | return vb; |
screamer | 0:7a64fbb4069d | 1451 | } |
screamer | 0:7a64fbb4069d | 1452 | |
screamer | 0:7a64fbb4069d | 1453 | #endif /* LWIP_SNMP */ |