1 | /**
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2 | * @file
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3 | * SNMPv1 traps implementation.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * This file is part of the lwIP TCP/IP stack.
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33 | *
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34 | * Author: Martin Hentschel
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35 | * Christiaan Simons <christiaan.simons@axon.tv>
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36 | *
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37 | */
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38 |
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39 | #include "lwip/apps/snmp_opts.h"
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40 |
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41 | #if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
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42 |
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43 | #include <string.h>
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44 |
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45 | #include "lwip/snmp.h"
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46 | #include "lwip/sys.h"
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47 | #include "lwip/apps/snmp.h"
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48 | #include "lwip/apps/snmp_core.h"
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49 | #include "lwip/prot/iana.h"
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50 | #include "snmp_msg.h"
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51 | #include "snmp_asn1.h"
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52 | #include "snmp_core_priv.h"
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53 |
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54 | struct snmp_msg_trap {
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55 | /* source enterprise ID (sysObjectID) */
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56 | const struct snmp_obj_id *enterprise;
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57 | /* source IP address, raw network order format */
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58 | ip_addr_t sip;
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59 | /* generic trap code */
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60 | u32_t gen_trap;
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61 | /* specific trap code */
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62 | u32_t spc_trap;
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63 | /* timestamp */
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64 | u32_t ts;
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65 | /* snmp_version */
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66 | u32_t snmp_version;
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67 |
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68 | /* output trap lengths used in ASN encoding */
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69 | /* encoding pdu length */
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70 | u16_t pdulen;
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71 | /* encoding community length */
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72 | u16_t comlen;
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73 | /* encoding sequence length */
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74 | u16_t seqlen;
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75 | /* encoding varbinds sequence length */
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76 | u16_t vbseqlen;
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77 | };
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78 |
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79 | static u16_t snmp_trap_varbind_sum(struct snmp_msg_trap *trap, struct snmp_varbind *varbinds);
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80 | static u16_t snmp_trap_header_sum(struct snmp_msg_trap *trap, u16_t vb_len);
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81 | static err_t snmp_trap_header_enc(struct snmp_msg_trap *trap, struct snmp_pbuf_stream *pbuf_stream);
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82 | static err_t snmp_trap_varbind_enc(struct snmp_msg_trap *trap, struct snmp_pbuf_stream *pbuf_stream, struct snmp_varbind *varbinds);
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83 |
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84 | #define BUILD_EXEC(code) \
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85 | if ((code) != ERR_OK) { \
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86 | LWIP_DEBUGF(SNMP_DEBUG, ("SNMP error during creation of outbound trap frame!")); \
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87 | return ERR_ARG; \
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88 | }
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89 |
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90 | /** Agent community string for sending traps */
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91 | extern const char *snmp_community_trap;
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92 |
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93 | void *snmp_traps_handle;
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94 |
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95 | struct snmp_trap_dst {
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96 | /* destination IP address in network order */
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97 | ip_addr_t dip;
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98 | /* set to 0 when disabled, >0 when enabled */
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99 | u8_t enable;
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100 | };
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101 | static struct snmp_trap_dst trap_dst[SNMP_TRAP_DESTINATIONS];
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102 |
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103 | static u8_t snmp_auth_traps_enabled = 0;
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104 |
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105 | /**
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106 | * @ingroup snmp_traps
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107 | * Sets enable switch for this trap destination.
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108 | * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
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109 | * @param enable switch if 0 destination is disabled >0 enabled.
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110 | */
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111 | void
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112 | snmp_trap_dst_enable(u8_t dst_idx, u8_t enable)
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113 | {
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114 | LWIP_ASSERT_CORE_LOCKED();
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115 | if (dst_idx < SNMP_TRAP_DESTINATIONS) {
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116 | trap_dst[dst_idx].enable = enable;
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117 | }
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118 | }
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119 |
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120 | /**
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121 | * @ingroup snmp_traps
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122 | * Sets IPv4 address for this trap destination.
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123 | * @param dst_idx index in 0 .. SNMP_TRAP_DESTINATIONS-1
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124 | * @param dst IPv4 address in host order.
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125 | */
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126 | void
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127 | snmp_trap_dst_ip_set(u8_t dst_idx, const ip_addr_t *dst)
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128 | {
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129 | LWIP_ASSERT_CORE_LOCKED();
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130 | if (dst_idx < SNMP_TRAP_DESTINATIONS) {
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131 | ip_addr_set(&trap_dst[dst_idx].dip, dst);
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132 | }
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133 | }
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134 |
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135 | /**
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136 | * @ingroup snmp_traps
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137 | * Enable/disable authentication traps
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138 | */
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139 | void
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140 | snmp_set_auth_traps_enabled(u8_t enable)
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141 | {
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142 | snmp_auth_traps_enabled = enable;
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143 | }
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144 |
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145 | /**
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146 | * @ingroup snmp_traps
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147 | * Get authentication traps enabled state
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148 | */
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149 | u8_t
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150 | snmp_get_auth_traps_enabled(void)
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151 | {
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152 | return snmp_auth_traps_enabled;
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153 | }
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154 |
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155 |
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156 | /**
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157 | * @ingroup snmp_traps
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158 | * Sends a generic or enterprise specific trap message.
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159 | *
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160 | * @param eoid points to enterprise object identifier
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161 | * @param generic_trap is the trap code
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162 | * @param specific_trap used for enterprise traps when generic_trap == 6
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163 | * @param varbinds linked list of varbinds to be sent
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164 | * @return ERR_OK when success, ERR_MEM if we're out of memory
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165 | *
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166 | * @note the use of the enterprise identifier field
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167 | * is per RFC1215.
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168 | * Use .iso.org.dod.internet.mgmt.mib-2.snmp for generic traps
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169 | * and .iso.org.dod.internet.private.enterprises.yourenterprise
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170 | * (sysObjectID) for specific traps.
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171 | */
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172 | err_t
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173 | snmp_send_trap(const struct snmp_obj_id *eoid, s32_t generic_trap, s32_t specific_trap, struct snmp_varbind *varbinds)
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174 | {
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175 | struct snmp_msg_trap trap_msg;
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176 | struct snmp_trap_dst *td;
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177 | struct pbuf *p;
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178 | u16_t i, tot_len;
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179 | err_t err = ERR_OK;
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180 |
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181 | LWIP_ASSERT_CORE_LOCKED();
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182 |
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183 | trap_msg.snmp_version = 0;
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184 |
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185 | for (i = 0, td = &trap_dst[0]; i < SNMP_TRAP_DESTINATIONS; i++, td++) {
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186 | if ((td->enable != 0) && !ip_addr_isany(&td->dip)) {
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187 | /* lookup current source address for this dst */
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188 | if (snmp_get_local_ip_for_dst(snmp_traps_handle, &td->dip, &trap_msg.sip)) {
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189 | if (eoid == NULL) {
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190 | trap_msg.enterprise = snmp_get_device_enterprise_oid();
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191 | } else {
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192 | trap_msg.enterprise = eoid;
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193 | }
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194 |
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195 | trap_msg.gen_trap = generic_trap;
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196 | if (generic_trap == SNMP_GENTRAP_ENTERPRISE_SPECIFIC) {
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197 | trap_msg.spc_trap = specific_trap;
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198 | } else {
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199 | trap_msg.spc_trap = 0;
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200 | }
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201 |
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202 | MIB2_COPY_SYSUPTIME_TO(&trap_msg.ts);
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203 |
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204 | /* pass 0, calculate length fields */
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205 | tot_len = snmp_trap_varbind_sum(&trap_msg, varbinds);
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206 | tot_len = snmp_trap_header_sum(&trap_msg, tot_len);
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207 |
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208 | /* allocate pbuf(s) */
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209 | p = pbuf_alloc(PBUF_TRANSPORT, tot_len, PBUF_RAM);
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210 | if (p != NULL) {
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211 | struct snmp_pbuf_stream pbuf_stream;
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212 | snmp_pbuf_stream_init(&pbuf_stream, p, 0, tot_len);
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213 |
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214 | /* pass 1, encode packet into the pbuf(s) */
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215 | snmp_trap_header_enc(&trap_msg, &pbuf_stream);
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216 | snmp_trap_varbind_enc(&trap_msg, &pbuf_stream, varbinds);
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217 |
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218 | snmp_stats.outtraps++;
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219 | snmp_stats.outpkts++;
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220 |
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221 | /** send to the TRAP destination */
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222 | snmp_sendto(snmp_traps_handle, p, &td->dip, LWIP_IANA_PORT_SNMP_TRAP);
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223 | pbuf_free(p);
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224 | } else {
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225 | err = ERR_MEM;
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226 | }
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227 | } else {
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228 | /* routing error */
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229 | err = ERR_RTE;
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230 | }
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231 | }
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232 | }
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233 | return err;
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234 | }
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235 |
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236 | /**
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237 | * @ingroup snmp_traps
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238 | * Send generic SNMP trap
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239 | */
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240 | err_t
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241 | snmp_send_trap_generic(s32_t generic_trap)
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242 | {
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243 | static const struct snmp_obj_id oid = { 7, { 1, 3, 6, 1, 2, 1, 11 } };
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244 | return snmp_send_trap(&oid, generic_trap, 0, NULL);
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245 | }
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246 |
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247 | /**
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248 | * @ingroup snmp_traps
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249 | * Send specific SNMP trap with variable bindings
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250 | */
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251 | err_t
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252 | snmp_send_trap_specific(s32_t specific_trap, struct snmp_varbind *varbinds)
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253 | {
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254 | return snmp_send_trap(NULL, SNMP_GENTRAP_ENTERPRISE_SPECIFIC, specific_trap, varbinds);
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255 | }
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256 |
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257 | /**
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258 | * @ingroup snmp_traps
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259 | * Send coldstart trap
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260 | */
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261 | void
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262 | snmp_coldstart_trap(void)
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263 | {
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264 | snmp_send_trap_generic(SNMP_GENTRAP_COLDSTART);
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265 | }
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266 |
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267 | /**
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268 | * @ingroup snmp_traps
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269 | * Send authentication failure trap (used internally by agent)
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270 | */
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271 | void
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272 | snmp_authfail_trap(void)
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273 | {
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274 | if (snmp_auth_traps_enabled != 0) {
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275 | snmp_send_trap_generic(SNMP_GENTRAP_AUTH_FAILURE);
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276 | }
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277 | }
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278 |
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279 | static u16_t
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280 | snmp_trap_varbind_sum(struct snmp_msg_trap *trap, struct snmp_varbind *varbinds)
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281 | {
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282 | struct snmp_varbind *varbind;
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283 | u16_t tot_len;
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284 | u8_t tot_len_len;
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285 |
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286 | tot_len = 0;
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287 | varbind = varbinds;
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288 | while (varbind != NULL) {
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289 | struct snmp_varbind_len len;
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290 |
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291 | if (snmp_varbind_length(varbind, &len) == ERR_OK) {
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292 | tot_len += 1 + len.vb_len_len + len.vb_value_len;
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293 | }
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294 |
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295 | varbind = varbind->next;
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296 | }
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297 |
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298 | trap->vbseqlen = tot_len;
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299 | snmp_asn1_enc_length_cnt(trap->vbseqlen, &tot_len_len);
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300 | tot_len += 1 + tot_len_len;
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301 |
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302 | return tot_len;
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303 | }
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304 |
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305 | /**
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306 | * Sums trap header field lengths from tail to head and
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307 | * returns trap_header_lengths for second encoding pass.
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308 | *
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309 | * @param trap Trap message
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310 | * @param vb_len varbind-list length
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311 | * @return the required length for encoding the trap header
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312 | */
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313 | static u16_t
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314 | snmp_trap_header_sum(struct snmp_msg_trap *trap, u16_t vb_len)
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315 | {
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316 | u16_t tot_len;
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317 | u16_t len;
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318 | u8_t lenlen;
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319 |
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320 | tot_len = vb_len;
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321 |
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322 | snmp_asn1_enc_u32t_cnt(trap->ts, &len);
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323 | snmp_asn1_enc_length_cnt(len, &lenlen);
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324 | tot_len += 1 + len + lenlen;
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325 |
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326 | snmp_asn1_enc_s32t_cnt(trap->spc_trap, &len);
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327 | snmp_asn1_enc_length_cnt(len, &lenlen);
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328 | tot_len += 1 + len + lenlen;
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329 |
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330 | snmp_asn1_enc_s32t_cnt(trap->gen_trap, &len);
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331 | snmp_asn1_enc_length_cnt(len, &lenlen);
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332 | tot_len += 1 + len + lenlen;
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333 |
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334 | if (IP_IS_V6_VAL(trap->sip)) {
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335 | #if LWIP_IPV6
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336 | len = sizeof(ip_2_ip6(&trap->sip)->addr);
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337 | #endif
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338 | } else {
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339 | #if LWIP_IPV4
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340 | len = sizeof(ip_2_ip4(&trap->sip)->addr);
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341 | #endif
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342 | }
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343 | snmp_asn1_enc_length_cnt(len, &lenlen);
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344 | tot_len += 1 + len + lenlen;
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345 |
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346 | snmp_asn1_enc_oid_cnt(trap->enterprise->id, trap->enterprise->len, &len);
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347 | snmp_asn1_enc_length_cnt(len, &lenlen);
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348 | tot_len += 1 + len + lenlen;
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349 |
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350 | trap->pdulen = tot_len;
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351 | snmp_asn1_enc_length_cnt(trap->pdulen, &lenlen);
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352 | tot_len += 1 + lenlen;
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353 |
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354 | trap->comlen = (u16_t)LWIP_MIN(strlen(snmp_community_trap), 0xFFFF);
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355 | snmp_asn1_enc_length_cnt(trap->comlen, &lenlen);
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356 | tot_len += 1 + lenlen + trap->comlen;
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357 |
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358 | snmp_asn1_enc_s32t_cnt(trap->snmp_version, &len);
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359 | snmp_asn1_enc_length_cnt(len, &lenlen);
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360 | tot_len += 1 + len + lenlen;
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361 |
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362 | trap->seqlen = tot_len;
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363 | snmp_asn1_enc_length_cnt(trap->seqlen, &lenlen);
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364 | tot_len += 1 + lenlen;
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365 |
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366 | return tot_len;
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367 | }
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368 |
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369 | static err_t
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370 | snmp_trap_varbind_enc(struct snmp_msg_trap *trap, struct snmp_pbuf_stream *pbuf_stream, struct snmp_varbind *varbinds)
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371 | {
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372 | struct snmp_asn1_tlv tlv;
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373 | struct snmp_varbind *varbind;
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374 |
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375 | varbind = varbinds;
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376 |
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377 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_SEQUENCE, 0, trap->vbseqlen);
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378 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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379 |
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380 | while (varbind != NULL) {
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381 | BUILD_EXEC( snmp_append_outbound_varbind(pbuf_stream, varbind) );
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382 |
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383 | varbind = varbind->next;
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384 | }
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385 |
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386 | return ERR_OK;
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387 | }
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388 |
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389 | /**
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390 | * Encodes trap header from head to tail.
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391 | */
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392 | static err_t
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393 | snmp_trap_header_enc(struct snmp_msg_trap *trap, struct snmp_pbuf_stream *pbuf_stream)
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394 | {
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395 | struct snmp_asn1_tlv tlv;
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396 |
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397 | /* 'Message' sequence */
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398 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_SEQUENCE, 0, trap->seqlen);
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399 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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400 |
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401 | /* version */
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402 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_INTEGER, 0, 0);
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403 | snmp_asn1_enc_s32t_cnt(trap->snmp_version, &tlv.value_len);
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404 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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405 | BUILD_EXEC( snmp_asn1_enc_s32t(pbuf_stream, tlv.value_len, trap->snmp_version) );
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406 |
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407 | /* community */
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408 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_OCTET_STRING, 0, trap->comlen);
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409 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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410 | BUILD_EXEC( snmp_asn1_enc_raw(pbuf_stream, (const u8_t *)snmp_community_trap, trap->comlen) );
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411 |
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412 | /* 'PDU' sequence */
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413 | SNMP_ASN1_SET_TLV_PARAMS(tlv, (SNMP_ASN1_CLASS_CONTEXT | SNMP_ASN1_CONTENTTYPE_CONSTRUCTED | SNMP_ASN1_CONTEXT_PDU_TRAP), 0, trap->pdulen);
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414 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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415 |
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416 | /* object ID */
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417 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_OBJECT_ID, 0, 0);
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418 | snmp_asn1_enc_oid_cnt(trap->enterprise->id, trap->enterprise->len, &tlv.value_len);
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419 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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420 | BUILD_EXEC( snmp_asn1_enc_oid(pbuf_stream, trap->enterprise->id, trap->enterprise->len) );
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421 |
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422 | /* IP addr */
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423 | if (IP_IS_V6_VAL(trap->sip)) {
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424 | #if LWIP_IPV6
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425 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_IPADDR, 0, sizeof(ip_2_ip6(&trap->sip)->addr));
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426 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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427 | BUILD_EXEC( snmp_asn1_enc_raw(pbuf_stream, (const u8_t *)&ip_2_ip6(&trap->sip)->addr, sizeof(ip_2_ip6(&trap->sip)->addr)) );
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428 | #endif
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429 | } else {
|
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430 | #if LWIP_IPV4
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431 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_IPADDR, 0, sizeof(ip_2_ip4(&trap->sip)->addr));
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432 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
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433 | BUILD_EXEC( snmp_asn1_enc_raw(pbuf_stream, (const u8_t *)&ip_2_ip4(&trap->sip)->addr, sizeof(ip_2_ip4(&trap->sip)->addr)) );
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434 | #endif
|
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435 | }
|
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436 |
|
---|
437 | /* trap length */
|
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438 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_INTEGER, 0, 0);
|
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439 | snmp_asn1_enc_s32t_cnt(trap->gen_trap, &tlv.value_len);
|
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440 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
|
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441 | BUILD_EXEC( snmp_asn1_enc_s32t(pbuf_stream, tlv.value_len, trap->gen_trap) );
|
---|
442 |
|
---|
443 | /* specific trap */
|
---|
444 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_INTEGER, 0, 0);
|
---|
445 | snmp_asn1_enc_s32t_cnt(trap->spc_trap, &tlv.value_len);
|
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446 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
|
---|
447 | BUILD_EXEC( snmp_asn1_enc_s32t(pbuf_stream, tlv.value_len, trap->spc_trap) );
|
---|
448 |
|
---|
449 | /* timestamp */
|
---|
450 | SNMP_ASN1_SET_TLV_PARAMS(tlv, SNMP_ASN1_TYPE_TIMETICKS, 0, 0);
|
---|
451 | snmp_asn1_enc_s32t_cnt(trap->ts, &tlv.value_len);
|
---|
452 | BUILD_EXEC( snmp_ans1_enc_tlv(pbuf_stream, &tlv) );
|
---|
453 | BUILD_EXEC( snmp_asn1_enc_s32t(pbuf_stream, tlv.value_len, trap->ts) );
|
---|
454 |
|
---|
455 | return ERR_OK;
|
---|
456 | }
|
---|
457 |
|
---|
458 | #endif /* LWIP_SNMP */
|
---|