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);
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384 | snmp_asn1_enc_length_cnt(thl->eidlen, &thl->eidlenlen);
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385 | tot_len += 1 + thl->eidlen + thl->eidlenlen;
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386 |
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387 | thl->pdulen = tot_len;
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388 | snmp_asn1_enc_length_cnt(thl->pdulen, &thl->pdulenlen);
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389 | tot_len += 1 + thl->pdulenlen;
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390 |
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391 | thl->comlen = sizeof(snmp_publiccommunity) - 1;
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392 | snmp_asn1_enc_length_cnt(thl->comlen, &thl->comlenlen);
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393 | tot_len += 1 + thl->comlenlen + thl->comlen;
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394 |
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395 | snmp_asn1_enc_s32t_cnt(snmp_version, &thl->verlen);
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396 | snmp_asn1_enc_length_cnt(thl->verlen, &thl->verlenlen);
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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 */
|
---|