[164] | 1 | /**
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| 2 | * @file
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| 3 | * SNMP output message processing (RFC1157).
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| 4 | *
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| 5 | * Output responses and traps are build in two passes:
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| 6 | *
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| 7 | * Pass 0: iterate over the output message backwards to determine encoding lengths
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| 8 | * Pass 1: the actual forward encoding of internal form into ASN1
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| 9 | *
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| 10 | * The single-pass encoding method described by Comer & Stevens
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| 11 | * requires extra buffer space and copying for reversal of the packet.
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| 12 | * The buffer requirement can be prohibitively large for big payloads
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| 13 | * (>= 484) therefore we use the two encoding passes.
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| 14 | */
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| 15 |
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| 16 | /*
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| 17 | * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
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| 18 | * All rights reserved.
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| 19 | *
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| 20 | * Redistribution and use in source and binary forms, with or without modification,
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| 21 | * are permitted provided that the following conditions are met:
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| 22 | *
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| 23 | * 1. Redistributions of source code must retain the above copyright notice,
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| 24 | * this list of conditions and the following disclaimer.
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| 25 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 26 | * this list of conditions and the following disclaimer in the documentation
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| 27 | * and/or other materials provided with the distribution.
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| 28 | * 3. The name of the author may not be used to endorse or promote products
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| 29 | * derived from this software without specific prior written permission.
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| 30 | *
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| 31 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 32 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 33 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 34 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 35 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 36 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 39 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 40 | * OF SUCH DAMAGE.
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| 41 | *
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| 42 | * Author: Christiaan Simons <christiaan.simons@axon.tv>
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| 43 | */
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| 44 |
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| 45 | #include "lwip/opt.h"
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| 46 |
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| 47 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
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| 48 |
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| 49 | #include "lwip/udp.h"
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| 50 | #include "lwip/netif.h"
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| 51 | #include "lwip/snmp.h"
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| 52 | #include "lwip/snmp_asn1.h"
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| 53 | #include "lwip/snmp_msg.h"
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| 54 |
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| 55 | struct snmp_trap_dst
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| 56 | {
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| 57 | /* destination IP address in network order */
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| 58 | ip_addr_t dip;
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| 59 | /* set to 0 when disabled, >0 when enabled */
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| 60 | u8_t enable;
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| 61 | };
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| 62 | struct snmp_trap_dst trap_dst[SNMP_TRAP_DESTINATIONS];
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| 63 |
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| 64 | /** TRAP message structure */
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| 65 | struct snmp_msg_trap trap_msg;
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| 66 |
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| 67 | static u16_t snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len);
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| 68 | static u16_t snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len);
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| 69 | static u16_t snmp_varbind_list_sum(struct snmp_varbind_root *root);
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| 70 |
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| 71 | static u16_t snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p);
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| 72 | static u16_t snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p);
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| 73 | static u16_t snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs);
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| 74 |
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| 75 | /**
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| 76 | * Sets enable switch for this trap destination.
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| 77 | * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
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| 78 | * @param enable switch if 0 destination is disabled >0 enabled.
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| 79 | */
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| 80 | void
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| 81 | snmp_trap_dst_enable(u8_t dst_idx, u8_t enable)
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| 82 | {
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| 83 | if (dst_idx < SNMP_TRAP_DESTINATIONS)
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| 84 | {
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| 85 | trap_dst[dst_idx].enable = enable;
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| 86 | }
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| 87 | }
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| 88 |
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| 89 | /**
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| 90 | * Sets IPv4 address for this trap destination.
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| 91 | * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
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| 92 | * @param dst IPv4 address in host order.
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| 93 | */
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| 94 | void
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| 95 | snmp_trap_dst_ip_set(u8_t dst_idx, ip_addr_t *dst)
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| 96 | {
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| 97 | if (dst_idx < SNMP_TRAP_DESTINATIONS)
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| 98 | {
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| 99 | ip_addr_set(&trap_dst[dst_idx].dip, dst);
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| 100 | }
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| 101 | }
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| 102 |
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| 103 | /**
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| 104 | * Sends a 'getresponse' message to the request originator.
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| 105 | *
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| 106 | * @param m_stat points to the current message request state source
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| 107 | * @return ERR_OK when success, ERR_MEM if we're out of memory
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| 108 | *
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| 109 | * @note the caller is responsible for filling in outvb in the m_stat
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| 110 | * and provide error-status and index (except for tooBig errors) ...
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| 111 | */
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| 112 | err_t
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| 113 | snmp_send_response(struct snmp_msg_pstat *m_stat)
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| 114 | {
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| 115 | struct snmp_varbind_root emptyvb = {NULL, NULL, 0, 0, 0};
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| 116 | struct pbuf *p;
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| 117 | u16_t tot_len;
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| 118 | err_t err;
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| 119 |
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| 120 | /* pass 0, calculate length fields */
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| 121 | tot_len = snmp_varbind_list_sum(&m_stat->outvb);
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| 122 | tot_len = snmp_resp_header_sum(m_stat, tot_len);
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| 123 |
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| 124 | /* try allocating pbuf(s) for complete response */
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| 125 | p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
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| 126 | if (p == NULL)
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| 127 | {
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| 128 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() tooBig\n"));
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| 129 |
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| 130 | /* can't construct reply, return error-status tooBig */
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| 131 | m_stat->error_status = SNMP_ES_TOOBIG;
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| 132 | m_stat->error_index = 0;
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| 133 | /* pass 0, recalculate lengths, for empty varbind-list */
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| 134 | tot_len = snmp_varbind_list_sum(&emptyvb);
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| 135 | tot_len = snmp_resp_header_sum(m_stat, tot_len);
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| 136 | /* retry allocation once for header and empty varbind-list */
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| 137 | p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
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| 138 | }
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| 139 | if (p != NULL)
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| 140 | {
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| 141 | /* first pbuf alloc try or retry alloc success */
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| 142 | u16_t ofs;
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| 143 |
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| 144 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() p != NULL\n"));
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| 145 |
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| 146 | /* pass 1, size error, encode packet ino the pbuf(s) */
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| 147 | ofs = snmp_resp_header_enc(m_stat, p);
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| 148 | snmp_varbind_list_enc(&m_stat->outvb, p, ofs);
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| 149 |
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| 150 | switch (m_stat->error_status)
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| 151 | {
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| 152 | case SNMP_ES_TOOBIG:
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| 153 | snmp_inc_snmpouttoobigs();
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| 154 | break;
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| 155 | case SNMP_ES_NOSUCHNAME:
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| 156 | snmp_inc_snmpoutnosuchnames();
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| 157 | break;
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| 158 | case SNMP_ES_BADVALUE:
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| 159 | snmp_inc_snmpoutbadvalues();
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| 160 | break;
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| 161 | case SNMP_ES_GENERROR:
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| 162 | snmp_inc_snmpoutgenerrs();
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| 163 | break;
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| 164 | }
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| 165 | snmp_inc_snmpoutgetresponses();
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| 166 | snmp_inc_snmpoutpkts();
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| 167 |
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| 168 | /** @todo do we need separate rx and tx pcbs for threaded case? */
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| 169 | /** connect to the originating source */
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| 170 | udp_connect(m_stat->pcb, &m_stat->sip, m_stat->sp);
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| 171 | err = udp_send(m_stat->pcb, p);
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| 172 | if (err == ERR_MEM)
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| 173 | {
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| 174 | /** @todo release some memory, retry and return tooBig? tooMuchHassle? */
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| 175 | err = ERR_MEM;
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| 176 | }
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| 177 | else
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| 178 | {
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| 179 | err = ERR_OK;
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| 180 | }
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| 181 | /** disassociate remote address and port with this pcb */
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| 182 | udp_disconnect(m_stat->pcb);
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| 183 |
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| 184 | pbuf_free(p);
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| 185 | LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_snd_response() done\n"));
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| 186 | return err;
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| 187 | }
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| 188 | else
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| 189 | {
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| 190 | /* first pbuf alloc try or retry alloc failed
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| 191 | very low on memory, couldn't return tooBig */
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| 192 | return ERR_MEM;
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| 193 | }
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| 194 | }
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| 195 |
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| 196 |
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| 197 | /**
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| 198 | * Sends an generic or enterprise specific trap message.
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| 199 | *
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| 200 | * @param generic_trap is the trap code
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| 201 | * @param eoid points to enterprise object identifier
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| 202 | * @param specific_trap used for enterprise traps when generic_trap == 6
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| 203 | * @return ERR_OK when success, ERR_MEM if we're out of memory
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| 204 | *
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| 205 | * @note the caller is responsible for filling in outvb in the trap_msg
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| 206 | * @note the use of the enterpise identifier field
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| 207 | * is per RFC1215.
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| 208 | * Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps
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| 209 | * and .iso.org.dod.internet.private.enterprises.yourenterprise
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| 210 | * (sysObjectID) for specific traps.
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| 211 | */
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| 212 | err_t
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| 213 | snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap)
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| 214 | {
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| 215 | struct snmp_trap_dst *td;
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| 216 | struct netif *dst_if;
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| 217 | ip_addr_t dst_ip;
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| 218 | struct pbuf *p;
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| 219 | u16_t i,tot_len;
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| 220 |
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| 221 | for (i=0, td = &trap_dst[0]; i<SNMP_TRAP_DESTINATIONS; i++, td++)
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| 222 | {
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| 223 | if ((td->enable != 0) && !ip_addr_isany(&td->dip))
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| 224 | {
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| 225 | /* network order trap destination */
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| 226 | ip_addr_copy(trap_msg.dip, td->dip);
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| 227 | /* lookup current source address for this dst */
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| 228 | dst_if = ip_route(&td->dip);
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| 229 | ip_addr_copy(dst_ip, dst_if->ip_addr);
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| 230 | /* @todo: what about IPv6? */
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| 231 | trap_msg.sip_raw[0] = ip4_addr1(&dst_ip);
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| 232 | trap_msg.sip_raw[1] = ip4_addr2(&dst_ip);
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| 233 | trap_msg.sip_raw[2] = ip4_addr3(&dst_ip);
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| 234 | trap_msg.sip_raw[3] = ip4_addr4(&dst_ip);
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| 235 | trap_msg.gen_trap = generic_trap;
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| 236 | trap_msg.spc_trap = specific_trap;
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| 237 | if (generic_trap == SNMP_GENTRAP_ENTERPRISESPC)
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| 238 | {
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| 239 | /* enterprise-Specific trap */
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| 240 | trap_msg.enterprise = eoid;
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| 241 | }
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| 242 | else
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| 243 | {
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| 244 | /* generic (MIB-II) trap */
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| 245 | snmp_get_snmpgrpid_ptr(&trap_msg.enterprise);
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| 246 | }
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| 247 | snmp_get_sysuptime(&trap_msg.ts);
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| 248 |
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| 249 | /* pass 0, calculate length fields */
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| 250 | tot_len = snmp_varbind_list_sum(&trap_msg.outvb);
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| 251 | tot_len = snmp_trap_header_sum(&trap_msg, tot_len);
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| 252 |
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| 253 | /* allocate pbuf(s) */
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| 254 | p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_POOL);
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| 255 | if (p != NULL)
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| 256 | {
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| 257 | u16_t ofs;
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| 258 |
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| 259 | /* pass 1, encode packet ino the pbuf(s) */
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| 260 | ofs = snmp_trap_header_enc(&trap_msg, p);
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| 261 | snmp_varbind_list_enc(&trap_msg.outvb, p, ofs);
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| 262 |
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| 263 | snmp_inc_snmpouttraps();
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| 264 | snmp_inc_snmpoutpkts();
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| 265 |
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| 266 | /** send to the TRAP destination */
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| 267 | udp_sendto(trap_msg.pcb, p, &trap_msg.dip, SNMP_TRAP_PORT);
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| 268 |
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| 269 | pbuf_free(p);
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| 270 | }
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| 271 | else
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| 272 | {
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| 273 | return ERR_MEM;
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| 274 | }
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| 275 | }
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| 276 | }
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| 277 | return ERR_OK;
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| 278 | }
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| 279 |
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| 280 | void
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| 281 | snmp_coldstart_trap(void)
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| 282 | {
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| 283 | trap_msg.outvb.head = NULL;
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| 284 | trap_msg.outvb.tail = NULL;
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| 285 | trap_msg.outvb.count = 0;
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| 286 | snmp_send_trap(SNMP_GENTRAP_COLDSTART, NULL, 0);
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| 287 | }
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| 288 |
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| 289 | void
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| 290 | snmp_authfail_trap(void)
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| 291 | {
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| 292 | u8_t enable;
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| 293 | snmp_get_snmpenableauthentraps(&enable);
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| 294 | if (enable == 1)
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| 295 | {
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| 296 | trap_msg.outvb.head = NULL;
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| 297 | trap_msg.outvb.tail = NULL;
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| 298 | trap_msg.outvb.count = 0;
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| 299 | snmp_send_trap(SNMP_GENTRAP_AUTHFAIL, NULL, 0);
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| 300 | }
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| 301 | }
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| 302 |
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| 303 | /**
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| 304 | * Sums response header field lengths from tail to head and
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| 305 | * returns resp_header_lengths for second encoding pass.
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| 306 | *
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| 307 | * @param vb_len varbind-list length
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| 308 | * @param rhl points to returned header lengths
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| 309 | * @return the required lenght for encoding the response header
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| 310 | */
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| 311 | static u16_t
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| 312 | snmp_resp_header_sum(struct snmp_msg_pstat *m_stat, u16_t vb_len)
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| 313 | {
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| 314 | u16_t tot_len;
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| 315 | struct snmp_resp_header_lengths *rhl;
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| 316 |
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| 317 | rhl = &m_stat->rhl;
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| 318 | tot_len = vb_len;
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| 319 | snmp_asn1_enc_s32t_cnt(m_stat->error_index, &rhl->erridxlen);
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| 320 | snmp_asn1_enc_length_cnt(rhl->erridxlen, &rhl->erridxlenlen);
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| 321 | tot_len += 1 + rhl->erridxlenlen + rhl->erridxlen;
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| 322 |
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| 323 | snmp_asn1_enc_s32t_cnt(m_stat->error_status, &rhl->errstatlen);
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| 324 | snmp_asn1_enc_length_cnt(rhl->errstatlen, &rhl->errstatlenlen);
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| 325 | tot_len += 1 + rhl->errstatlenlen + rhl->errstatlen;
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| 326 |
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| 327 | snmp_asn1_enc_s32t_cnt(m_stat->rid, &rhl->ridlen);
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| 328 | snmp_asn1_enc_length_cnt(rhl->ridlen, &rhl->ridlenlen);
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| 329 | tot_len += 1 + rhl->ridlenlen + rhl->ridlen;
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| 330 |
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| 331 | rhl->pdulen = tot_len;
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| 332 | snmp_asn1_enc_length_cnt(rhl->pdulen, &rhl->pdulenlen);
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| 333 | tot_len += 1 + rhl->pdulenlen;
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| 334 |
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| 335 | rhl->comlen = m_stat->com_strlen;
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| 336 | snmp_asn1_enc_length_cnt(rhl->comlen, &rhl->comlenlen);
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| 337 | tot_len += 1 + rhl->comlenlen + rhl->comlen;
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| 338 |
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| 339 | snmp_asn1_enc_s32t_cnt(snmp_version, &rhl->verlen);
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| 340 | snmp_asn1_enc_length_cnt(rhl->verlen, &rhl->verlenlen);
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| 341 | tot_len += 1 + rhl->verlen + rhl->verlenlen;
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| 342 |
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| 343 | rhl->seqlen = tot_len;
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| 344 | snmp_asn1_enc_length_cnt(rhl->seqlen, &rhl->seqlenlen);
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| 345 | tot_len += 1 + rhl->seqlenlen;
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| 346 |
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| 347 | return tot_len;
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| 348 | }
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| 349 |
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| 350 | /**
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| 351 | * Sums trap header field lengths from tail to head and
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| 352 | * returns trap_header_lengths for second encoding pass.
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| 353 | *
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| 354 | * @param vb_len varbind-list length
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| 355 | * @param thl points to returned header lengths
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| 356 | * @return the required lenght for encoding the trap header
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| 357 | */
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| 358 | static u16_t
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| 359 | snmp_trap_header_sum(struct snmp_msg_trap *m_trap, u16_t vb_len)
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| 360 | {
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| 361 | u16_t tot_len;
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| 362 | struct snmp_trap_header_lengths *thl;
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| 363 |
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| 364 | thl = &m_trap->thl;
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| 365 | tot_len = vb_len;
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| 366 |
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| 367 | snmp_asn1_enc_u32t_cnt(m_trap->ts, &thl->tslen);
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| 368 | snmp_asn1_enc_length_cnt(thl->tslen, &thl->tslenlen);
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| 369 | tot_len += 1 + thl->tslen + thl->tslenlen;
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| 370 |
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| 371 | snmp_asn1_enc_s32t_cnt(m_trap->spc_trap, &thl->strplen);
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| 372 | snmp_asn1_enc_length_cnt(thl->strplen, &thl->strplenlen);
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| 373 | tot_len += 1 + thl->strplen + thl->strplenlen;
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| 374 |
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| 375 | snmp_asn1_enc_s32t_cnt(m_trap->gen_trap, &thl->gtrplen);
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| 376 | snmp_asn1_enc_length_cnt(thl->gtrplen, &thl->gtrplenlen);
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| 377 | tot_len += 1 + thl->gtrplen + thl->gtrplenlen;
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| 378 |
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| 379 | thl->aaddrlen = 4;
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| 380 | snmp_asn1_enc_length_cnt(thl->aaddrlen, &thl->aaddrlenlen);
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| 381 | tot_len += 1 + thl->aaddrlen + thl->aaddrlenlen;
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| 382 |
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| 383 | snmp_asn1_enc_oid_cnt(m_trap->enterprise->len, &m_trap->enterprise->id[0], &thl->eidlen);
|
---|
| 384 | snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen);
|
---|
| 385 | tot_len += 1 + thl->eidlen + thl->eidlenlen;
|
---|
| 386 |
|
---|
| 387 | thl->pdulen = tot_len;
|
---|
| 388 | snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen);
|
---|
| 389 | tot_len += 1 + thl->pdulenlen;
|
---|
| 390 |
|
---|
| 391 | thl->comlen = sizeof(snmp_publiccommunity) - 1;
|
---|
| 392 | snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen);
|
---|
| 393 | tot_len += 1 + thl->comlenlen + thl->comlen;
|
---|
| 394 |
|
---|
| 395 | snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen);
|
---|
| 396 | snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen);
|
---|
| 397 | tot_len += 1 + thl->verlen + thl->verlenlen;
|
---|
| 398 |
|
---|
| 399 | thl->seqlen = tot_len;
|
---|
| 400 | snmp_asn1_enc_length_cnt(thl->seqlen, &thl->seqlenlen);
|
---|
| 401 | tot_len += 1 + thl->seqlenlen;
|
---|
| 402 |
|
---|
| 403 | return tot_len;
|
---|
| 404 | }
|
---|
| 405 |
|
---|
| 406 | /**
|
---|
| 407 | * Sums varbind lengths from tail to head and
|
---|
| 408 | * annotates lengths in varbind for second encoding pass.
|
---|
| 409 | *
|
---|
| 410 | * @param root points to the root of the variable binding list
|
---|
| 411 | * @return the required lenght for encoding the variable bindings
|
---|
| 412 | */
|
---|
| 413 | static u16_t
|
---|
| 414 | snmp_varbind_list_sum(struct snmp_varbind_root *root)
|
---|
| 415 | {
|
---|
| 416 | struct snmp_varbind *vb;
|
---|
| 417 | u32_t *uint_ptr;
|
---|
| 418 | s32_t *sint_ptr;
|
---|
| 419 | u16_t tot_len;
|
---|
| 420 |
|
---|
| 421 | tot_len = 0;
|
---|
| 422 | vb = root->tail;
|
---|
| 423 | while ( vb != NULL )
|
---|
| 424 | {
|
---|
| 425 | /* encoded value lenght depends on type */
|
---|
| 426 | switch (vb->value_type)
|
---|
| 427 | {
|
---|
| 428 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
|
---|
| 429 | sint_ptr = (s32_t*)vb->value;
|
---|
| 430 | snmp_asn1_enc_s32t_cnt(*sint_ptr, &vb->vlen);
|
---|
| 431 | break;
|
---|
| 432 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
|
---|
| 433 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
|
---|
| 434 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
|
---|
| 435 | uint_ptr = (u32_t*)vb->value;
|
---|
| 436 | snmp_asn1_enc_u32t_cnt(*uint_ptr, &vb->vlen);
|
---|
| 437 | break;
|
---|
| 438 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
|
---|
| 439 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
|
---|
| 440 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
|
---|
| 441 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
|
---|
| 442 | vb->vlen = vb->value_len;
|
---|
| 443 | break;
|
---|
| 444 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
|
---|
| 445 | sint_ptr = (s32_t*)vb->value;
|
---|
| 446 | snmp_asn1_enc_oid_cnt(vb->value_len / sizeof(s32_t), sint_ptr, &vb->vlen);
|
---|
| 447 | break;
|
---|
| 448 | default:
|
---|
| 449 | /* unsupported type */
|
---|
| 450 | vb->vlen = 0;
|
---|
| 451 | break;
|
---|
| 452 | };
|
---|
| 453 | /* encoding length of value length field */
|
---|
| 454 | snmp_asn1_enc_length_cnt(vb->vlen, &vb->vlenlen);
|
---|
| 455 | snmp_asn1_enc_oid_cnt(vb->ident_len, vb->ident, &vb->olen);
|
---|
| 456 | snmp_asn1_enc_length_cnt(vb->olen, &vb->olenlen);
|
---|
| 457 |
|
---|
| 458 | vb->seqlen = 1 + vb->vlenlen + vb->vlen;
|
---|
| 459 | vb->seqlen += 1 + vb->olenlen + vb->olen;
|
---|
| 460 | snmp_asn1_enc_length_cnt(vb->seqlen, &vb->seqlenlen);
|
---|
| 461 |
|
---|
| 462 | /* varbind seq */
|
---|
| 463 | tot_len += 1 + vb->seqlenlen + vb->seqlen;
|
---|
| 464 |
|
---|
| 465 | vb = vb->prev;
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | /* varbind-list seq */
|
---|
| 469 | root->seqlen = tot_len;
|
---|
| 470 | snmp_asn1_enc_length_cnt(root->seqlen, &root->seqlenlen);
|
---|
| 471 | tot_len += 1 + root->seqlenlen;
|
---|
| 472 |
|
---|
| 473 | return tot_len;
|
---|
| 474 | }
|
---|
| 475 |
|
---|
| 476 | /**
|
---|
| 477 | * Encodes response header from head to tail.
|
---|
| 478 | */
|
---|
| 479 | static u16_t
|
---|
| 480 | snmp_resp_header_enc(struct snmp_msg_pstat *m_stat, struct pbuf *p)
|
---|
| 481 | {
|
---|
| 482 | u16_t ofs;
|
---|
| 483 |
|
---|
| 484 | ofs = 0;
|
---|
| 485 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
---|
| 486 | ofs += 1;
|
---|
| 487 | snmp_asn1_enc_length(p, ofs, m_stat->rhl.seqlen);
|
---|
| 488 | ofs += m_stat->rhl.seqlenlen;
|
---|
| 489 |
|
---|
| 490 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
---|
| 491 | ofs += 1;
|
---|
| 492 | snmp_asn1_enc_length(p, ofs, m_stat->rhl.verlen);
|
---|
| 493 | ofs += m_stat->rhl.verlenlen;
|
---|
| 494 | snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.verlen, snmp_version);
|
---|
| 495 | ofs += m_stat->rhl.verlen;
|
---|
| 496 |
|
---|
| 497 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
|
---|
| 498 | ofs += 1;
|
---|
| 499 | snmp_asn1_enc_length(p, ofs, m_stat->rhl.comlen);
|
---|
| 500 | ofs += m_stat->rhl.comlenlen;
|
---|
| 501 | snmp_asn1_enc_raw(p, ofs, m_stat->rhl.comlen, m_stat->community);
|
---|
| 502 | ofs += m_stat->rhl.comlen;
|
---|
| 503 |
|
---|
| 504 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_GET_RESP));
|
---|
| 505 | ofs += 1;
|
---|
| 506 | snmp_asn1_enc_length(p, ofs, m_stat->rhl.pdulen);
|
---|
| 507 | ofs += m_stat->rhl.pdulenlen;
|
---|
| 508 |
|
---|
| 509 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
---|
| 510 | ofs += 1;
|
---|
| 511 | snmp_asn1_enc_length(p, ofs, m_stat->rhl.ridlen);
|
---|
| 512 | ofs += m_stat->rhl.ridlenlen;
|
---|
| 513 | snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.ridlen, m_stat->rid);
|
---|
| 514 | ofs += m_stat->rhl.ridlen;
|
---|
| 515 |
|
---|
| 516 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
---|
| 517 | ofs += 1;
|
---|
| 518 | snmp_asn1_enc_length(p, ofs, m_stat->rhl.errstatlen);
|
---|
| 519 | ofs += m_stat->rhl.errstatlenlen;
|
---|
| 520 | snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.errstatlen, m_stat->error_status);
|
---|
| 521 | ofs += m_stat->rhl.errstatlen;
|
---|
| 522 |
|
---|
| 523 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
---|
| 524 | ofs += 1;
|
---|
| 525 | snmp_asn1_enc_length(p, ofs, m_stat->rhl.erridxlen);
|
---|
| 526 | ofs += m_stat->rhl.erridxlenlen;
|
---|
| 527 | snmp_asn1_enc_s32t(p, ofs, m_stat->rhl.erridxlen, m_stat->error_index);
|
---|
| 528 | ofs += m_stat->rhl.erridxlen;
|
---|
| 529 |
|
---|
| 530 | return ofs;
|
---|
| 531 | }
|
---|
| 532 |
|
---|
| 533 | /**
|
---|
| 534 | * Encodes trap header from head to tail.
|
---|
| 535 | */
|
---|
| 536 | static u16_t
|
---|
| 537 | snmp_trap_header_enc(struct snmp_msg_trap *m_trap, struct pbuf *p)
|
---|
| 538 | {
|
---|
| 539 | u16_t ofs;
|
---|
| 540 |
|
---|
| 541 | ofs = 0;
|
---|
| 542 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
---|
| 543 | ofs += 1;
|
---|
| 544 | snmp_asn1_enc_length(p, ofs, m_trap->thl.seqlen);
|
---|
| 545 | ofs += m_trap->thl.seqlenlen;
|
---|
| 546 |
|
---|
| 547 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
---|
| 548 | ofs += 1;
|
---|
| 549 | snmp_asn1_enc_length(p, ofs, m_trap->thl.verlen);
|
---|
| 550 | ofs += m_trap->thl.verlenlen;
|
---|
| 551 | snmp_asn1_enc_s32t(p, ofs, m_trap->thl.verlen, snmp_version);
|
---|
| 552 | ofs += m_trap->thl.verlen;
|
---|
| 553 |
|
---|
| 554 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR));
|
---|
| 555 | ofs += 1;
|
---|
| 556 | snmp_asn1_enc_length(p, ofs, m_trap->thl.comlen);
|
---|
| 557 | ofs += m_trap->thl.comlenlen;
|
---|
| 558 | snmp_asn1_enc_raw(p, ofs, m_trap->thl.comlen, (u8_t *)&snmp_publiccommunity[0]);
|
---|
| 559 | ofs += m_trap->thl.comlen;
|
---|
| 560 |
|
---|
| 561 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_CONTXT | SNMP_ASN1_CONSTR | SNMP_ASN1_PDU_TRAP));
|
---|
| 562 | ofs += 1;
|
---|
| 563 | snmp_asn1_enc_length(p, ofs, m_trap->thl.pdulen);
|
---|
| 564 | ofs += m_trap->thl.pdulenlen;
|
---|
| 565 |
|
---|
| 566 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
|
---|
| 567 | ofs += 1;
|
---|
| 568 | snmp_asn1_enc_length(p, ofs, m_trap->thl.eidlen);
|
---|
| 569 | ofs += m_trap->thl.eidlenlen;
|
---|
| 570 | snmp_asn1_enc_oid(p, ofs, m_trap->enterprise->len, &m_trap->enterprise->id[0]);
|
---|
| 571 | ofs += m_trap->thl.eidlen;
|
---|
| 572 |
|
---|
| 573 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR));
|
---|
| 574 | ofs += 1;
|
---|
| 575 | snmp_asn1_enc_length(p, ofs, m_trap->thl.aaddrlen);
|
---|
| 576 | ofs += m_trap->thl.aaddrlenlen;
|
---|
| 577 | snmp_asn1_enc_raw(p, ofs, m_trap->thl.aaddrlen, &m_trap->sip_raw[0]);
|
---|
| 578 | ofs += m_trap->thl.aaddrlen;
|
---|
| 579 |
|
---|
| 580 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
---|
| 581 | ofs += 1;
|
---|
| 582 | snmp_asn1_enc_length(p, ofs, m_trap->thl.gtrplen);
|
---|
| 583 | ofs += m_trap->thl.gtrplenlen;
|
---|
| 584 | snmp_asn1_enc_u32t(p, ofs, m_trap->thl.gtrplen, m_trap->gen_trap);
|
---|
| 585 | ofs += m_trap->thl.gtrplen;
|
---|
| 586 |
|
---|
| 587 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG));
|
---|
| 588 | ofs += 1;
|
---|
| 589 | snmp_asn1_enc_length(p, ofs, m_trap->thl.strplen);
|
---|
| 590 | ofs += m_trap->thl.strplenlen;
|
---|
| 591 | snmp_asn1_enc_u32t(p, ofs, m_trap->thl.strplen, m_trap->spc_trap);
|
---|
| 592 | ofs += m_trap->thl.strplen;
|
---|
| 593 |
|
---|
| 594 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS));
|
---|
| 595 | ofs += 1;
|
---|
| 596 | snmp_asn1_enc_length(p, ofs, m_trap->thl.tslen);
|
---|
| 597 | ofs += m_trap->thl.tslenlen;
|
---|
| 598 | snmp_asn1_enc_u32t(p, ofs, m_trap->thl.tslen, m_trap->ts);
|
---|
| 599 | ofs += m_trap->thl.tslen;
|
---|
| 600 |
|
---|
| 601 | return ofs;
|
---|
| 602 | }
|
---|
| 603 |
|
---|
| 604 | /**
|
---|
| 605 | * Encodes varbind list from head to tail.
|
---|
| 606 | */
|
---|
| 607 | static u16_t
|
---|
| 608 | snmp_varbind_list_enc(struct snmp_varbind_root *root, struct pbuf *p, u16_t ofs)
|
---|
| 609 | {
|
---|
| 610 | struct snmp_varbind *vb;
|
---|
| 611 | s32_t *sint_ptr;
|
---|
| 612 | u32_t *uint_ptr;
|
---|
| 613 | u8_t *raw_ptr;
|
---|
| 614 |
|
---|
| 615 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
---|
| 616 | ofs += 1;
|
---|
| 617 | snmp_asn1_enc_length(p, ofs, root->seqlen);
|
---|
| 618 | ofs += root->seqlenlen;
|
---|
| 619 |
|
---|
| 620 | vb = root->head;
|
---|
| 621 | while ( vb != NULL )
|
---|
| 622 | {
|
---|
| 623 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_CONSTR | SNMP_ASN1_SEQ));
|
---|
| 624 | ofs += 1;
|
---|
| 625 | snmp_asn1_enc_length(p, ofs, vb->seqlen);
|
---|
| 626 | ofs += vb->seqlenlen;
|
---|
| 627 |
|
---|
| 628 | snmp_asn1_enc_type(p, ofs, (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID));
|
---|
| 629 | ofs += 1;
|
---|
| 630 | snmp_asn1_enc_length(p, ofs, vb->olen);
|
---|
| 631 | ofs += vb->olenlen;
|
---|
| 632 | snmp_asn1_enc_oid(p, ofs, vb->ident_len, &vb->ident[0]);
|
---|
| 633 | ofs += vb->olen;
|
---|
| 634 |
|
---|
| 635 | snmp_asn1_enc_type(p, ofs, vb->value_type);
|
---|
| 636 | ofs += 1;
|
---|
| 637 | snmp_asn1_enc_length(p, ofs, vb->vlen);
|
---|
| 638 | ofs += vb->vlenlen;
|
---|
| 639 |
|
---|
| 640 | switch (vb->value_type)
|
---|
| 641 | {
|
---|
| 642 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG):
|
---|
| 643 | sint_ptr = (s32_t*)vb->value;
|
---|
| 644 | snmp_asn1_enc_s32t(p, ofs, vb->vlen, *sint_ptr);
|
---|
| 645 | break;
|
---|
| 646 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER):
|
---|
| 647 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE):
|
---|
| 648 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS):
|
---|
| 649 | uint_ptr = (u32_t*)vb->value;
|
---|
| 650 | snmp_asn1_enc_u32t(p, ofs, vb->vlen, *uint_ptr);
|
---|
| 651 | break;
|
---|
| 652 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR):
|
---|
| 653 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR):
|
---|
| 654 | case (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_OPAQUE):
|
---|
| 655 | raw_ptr = (u8_t*)vb->value;
|
---|
| 656 | snmp_asn1_enc_raw(p, ofs, vb->vlen, raw_ptr);
|
---|
| 657 | break;
|
---|
| 658 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_NUL):
|
---|
| 659 | break;
|
---|
| 660 | case (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID):
|
---|
| 661 | sint_ptr = (s32_t*)vb->value;
|
---|
| 662 | snmp_asn1_enc_oid(p, ofs, vb->value_len / sizeof(s32_t), sint_ptr);
|
---|
| 663 | break;
|
---|
| 664 | default:
|
---|
| 665 | /* unsupported type */
|
---|
| 666 | break;
|
---|
| 667 | };
|
---|
| 668 | ofs += vb->vlen;
|
---|
| 669 | vb = vb->next;
|
---|
| 670 | }
|
---|
| 671 | return ofs;
|
---|
| 672 | }
|
---|
| 673 |
|
---|
| 674 | #endif /* LWIP_SNMP */
|
---|