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