Clixon SNMP frontend update
* Integration of testhandler.c gives proper callback handling
* YANG `clixon-config@2022-03-21.yang` changes:
* Added option:
* `CLICON_SNMP_AGENT_SOCK`
This commit is contained in:
Olof hagsand
parent
c584d171ee
commit
28514c6750
5 changed files with 449 additions and 61 deletions
15
CHANGELOG.md
15
CHANGELOG.md
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@ -35,16 +35,21 @@
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* [3.3.2](#332) Aug 27 2017
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* [3.3.1](#331) June 7 2017
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## SNMP branch
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* Clixon SNMP frontend
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* Support of SNMP for retreiving and setting values via net-snmp using a MIB-YANG mapping defined in RFC6643.
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* For details, see [SNMP section of user manual](https://clixon-docs.readthedocs.io/en/latest/snmp.html)
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* YANG `clixon-config@2022-03-21.yang` changes:
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* Added option:
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* `CLICON_SNMP_AGENT_SOCK`
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* Thanks Siklu for sponshoring
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## 5.8.0
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Planned: July 2022
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### New features
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* Clixon SNMP frontend
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* Support of SNMP for retreiving and setting values via netsnmp using a MIB-YANG mapping defined in RFC6643.
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* For more details, see [SNMP section of user manual](https://clixon-docs.readthedocs.io/en/latest/snmp.html)
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* Thanks Siklu for sponshoring
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* YANG Action (RFC 7950 Section 7.15)
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* Register action callback with `action_callback_register()`, see main example
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* Remains: check list keys, validate output
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@ -58,59 +58,413 @@
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/* Command line options to be passed to getopt(3) */
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#define SNMP_OPTS "hD:f:l:o:"
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#if 1 // XXX hardcoded MIB object from https://github.com/net-snmp/subagent-example/blob/master/example-demon.c
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/* cp NET-SNMP-TUTORIAL-MIB.txt ~/.snmp/mibs/
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* sudo /usr/local/sbin/snmpd -Lo -C --rwcommunity=public --master=agentx -f
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* sudo example_demon
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* snmpget -v 2c -c public localhost NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0
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*/
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/*!
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* our initialization routine, automatically called by the agent
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* (to get called, the function name must match init_FILENAME())
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* the variable we want to tie an OID to. The agent will handle all
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* * GET and SET requests to this variable changing it's value as needed.
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*/
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static long nstAgentSubagentObject = 2;
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#if 1 // XXX hardcoded from https://github.com/net-snmp/net-snmp/blob/master/agent/mibgroup/testhandler.c
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static void
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init_nstAgentSubagentObject(clicon_handle h)
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Netsnmp_Node_Handler my_test_handler;
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Netsnmp_Node_Handler my_test_table_handler;
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Netsnmp_Node_Handler my_data_table_handler;
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Netsnmp_Node_Handler my_test_instance_handler;
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static oid my_test_oid[4] = { 1, 2, 3, 4 };
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static oid my_table_oid[4] = { 1, 2, 3, 5 };
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static oid my_instance_oid[5] = { 1, 2, 3, 6, 1 };
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static oid my_data_table_oid[4] = { 1, 2, 3, 7 };
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static oid my_data_ulong_instance[4] = { 1, 2, 3, 9 };
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u_long my_ulong = 42;
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void
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init_testhandler(void)
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{
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static oid nstAgentSubagentObject_oid[] =
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{ 1, 3, 6, 1, 4, 1, 8072, 2, 4, 1, 1, 2, 0 };
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/*
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* we're registering at .1.2.3.4
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*/
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netsnmp_handler_registration *my_test;
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netsnmp_table_registration_info *table_info;
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u_long ind1;
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netsnmp_table_data *table;
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netsnmp_table_row *row;
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clicon_debug(1, "%s", __FUNCTION__);
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/*
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* basic handler test
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*/
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netsnmp_register_handler(netsnmp_create_handler_registration
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("myTest", my_test_handler, my_test_oid, 4,
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HANDLER_CAN_RONLY));
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/*
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* instance handler test
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*/
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netsnmp_register_instance(netsnmp_create_handler_registration
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("myInstance", my_test_instance_handler,
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my_instance_oid, 5, HANDLER_CAN_RWRITE));
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netsnmp_register_ulong_instance("myulong",
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my_data_ulong_instance, 4,
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&my_ulong, NULL);
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/*
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* table helper test
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*/
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my_test = netsnmp_create_handler_registration("myTable",
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my_test_table_handler,
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my_table_oid, 4,
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HANDLER_CAN_RONLY);
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if (!my_test)
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return;
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table_info = SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
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if (table_info == NULL)
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return;
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netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER, ASN_INTEGER,
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0);
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table_info->min_column = 3;
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table_info->max_column = 3;
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netsnmp_register_table(my_test, table_info);
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/*
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* data table helper test
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*/
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/*
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* we'll construct a simple table here with two indexes: an
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* integer and a string (why not). It'll contain only one
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* column so the data pointer is merely the data in that
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* column.
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*/
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table = netsnmp_create_table_data("data_table_test");
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netsnmp_table_data_add_index(table, ASN_INTEGER);
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netsnmp_table_data_add_index(table, ASN_OCTET_STR);
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/*
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* 1 partridge in a pear tree
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*/
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row = netsnmp_create_table_data_row();
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ind1 = 1;
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netsnmp_table_row_add_index(row, ASN_INTEGER, &ind1, sizeof(ind1));
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netsnmp_table_row_add_index(row, ASN_OCTET_STR, "partridge",
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strlen("partridge"));
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row->data = NETSNMP_REMOVE_CONST(void *, "pear tree");
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netsnmp_table_data_add_row(table, row);
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/*
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* 2 turtle doves
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*/
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row = netsnmp_create_table_data_row();
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ind1 = 2;
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netsnmp_table_row_add_index(row, ASN_INTEGER, &ind1, sizeof(ind1));
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netsnmp_table_row_add_index(row, ASN_OCTET_STR, "turtle",
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strlen("turtle"));
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row->data = NETSNMP_REMOVE_CONST(void *, "doves");
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netsnmp_table_data_add_row(table, row);
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/*
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* we're going to register it as a normal table too, so we get the
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* automatically parsed column and index information
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*/
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table_info = SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
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if (table_info == NULL)
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return;
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netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER,
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ASN_OCTET_STR, 0);
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table_info->min_column = 3;
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table_info->max_column = 3;
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netsnmp_register_read_only_table_data(
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netsnmp_create_handler_registration("12days", my_data_table_handler, my_data_table_oid, 4,
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HANDLER_CAN_RONLY),
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table, table_info);
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}
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int
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my_test_handler(netsnmp_mib_handler *handler,
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netsnmp_handler_registration *reginfo,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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oid myoid1[] = { 1, 2, 3, 4, 5, 6 };
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static u_long accesses = 0;
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clicon_debug(1, "%s", __FUNCTION__);
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/*
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* a debugging statement. Run the agent with -DnstAgentSubagentObject to see
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* the output of this debugging statement.
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* loop through requests
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*/
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DEBUGMSGTL(("nstAgentSubagentObject",
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"Initializing the nstAgentSubagentObject module\n"));
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while (requests) {
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netsnmp_variable_list *var = requests->requestvb;
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DEBUGMSGTL(("testhandler", " oid:"));
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DEBUGMSGOID(("testhandler", var->name, var->name_length));
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DEBUGMSG(("testhandler", "\n"));
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switch (reqinfo->mode) {
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case MODE_GET:
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if (netsnmp_oid_equals(var->name, var->name_length, myoid1, 6)
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== 0) {
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snmp_set_var_typed_value(var, ASN_INTEGER,
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(u_char *) & accesses,
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sizeof(accesses));
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return SNMP_ERR_NOERROR;
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}
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break;
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case MODE_GETNEXT:
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if (snmp_oid_compare(var->name, var->name_length, myoid1, 6)
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< 0) {
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snmp_set_var_objid(var, myoid1, 6);
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snmp_set_var_typed_value(var, ASN_INTEGER,
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(u_char *) & accesses,
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sizeof(accesses));
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return SNMP_ERR_NOERROR;
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}
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break;
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default:
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netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_GENERR);
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break;
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}
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requests = requests->next;
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}
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return SNMP_ERR_NOERROR;
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}
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/*
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* functionally this is a simply a multiplication table for 12x12
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*/
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#define MAX_COLONE 12
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#define MAX_COLTWO 12
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#define RESULT_COLUMN 3
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int
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my_test_table_handler(netsnmp_mib_handler *handler,
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netsnmp_handler_registration *reginfo,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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netsnmp_table_registration_info
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*handler_reg_info =
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(netsnmp_table_registration_info *) handler->prev->myvoid;
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netsnmp_table_request_info *table_info;
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u_long result;
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int x, y;
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DEBUGMSGTL(("testhandler", "Got request:\n"));
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while (requests) {
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netsnmp_variable_list *var = requests->requestvb;
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if (requests->processed != 0)
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continue;
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DEBUGMSGTL(("testhandler_table", "Got request:\n"));
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DEBUGMSGTL(("testhandler_table", " oid:"));
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DEBUGMSGOID(("testhandler_table", var->name, var->name_length));
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DEBUGMSG(("testhandler_table", "\n"));
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table_info = netsnmp_extract_table_info(requests);
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if (table_info == NULL) {
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requests = requests->next;
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continue;
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}
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switch (reqinfo->mode) {
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case MODE_GETNEXT:
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/*
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* beyond our search range?
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*/
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if (table_info->colnum > RESULT_COLUMN)
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break;
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/*
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* the line below registers our variables defined above as
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* accessible and makes it writable. A read only version of any
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* of these registration would merely call
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* register_read_only_long_instance() instead. The functions
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* called below should be consistent with your MIB, however.
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*
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* If we wanted a callback when the value was retrieved or set
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* (even though the details of doing this are handled for you),
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* you could change the NULL pointer below to a valid handler
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* function.
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* below our minimum column?
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*/
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DEBUGMSGTL(("nstAgentSubagentObject",
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"Initalizing nstAgentSubagentObject scalar integer. Default value = %ld\n",
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nstAgentSubagentObject));
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if (table_info->colnum < RESULT_COLUMN ||
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/*
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* or no index specified
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*/
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table_info->indexes->val.integer == NULL) {
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table_info->colnum = RESULT_COLUMN;
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x = 0;
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y = 0;
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} else {
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x = *(table_info->indexes->val.integer);
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y = *(table_info->indexes->next_variable->val.integer);
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}
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netsnmp_register_long_instance("nstAgentSubagentObject",
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nstAgentSubagentObject_oid,
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OID_LENGTH(nstAgentSubagentObject_oid),
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&nstAgentSubagentObject, NULL);
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if (table_info->number_indexes ==
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handler_reg_info->number_indexes) {
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y++; /* GETNEXT is basically just y+1 for this table */
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if (y > MAX_COLTWO) { /* (with wrapping) */
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y = 0;
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x++;
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}
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}
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if (x <= MAX_COLONE) {
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result = x * y;
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DEBUGMSGTL(("nstAgentSubagentObject",
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"Done initalizing nstAgentSubagentObject module\n"));
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*(table_info->indexes->val.integer) = x;
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*(table_info->indexes->next_variable->val.integer) = y;
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netsnmp_table_build_result(reginfo, requests,
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table_info, ASN_INTEGER,
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(u_char *) & result,
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sizeof(result));
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}
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break;
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case MODE_GET:
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if (var->type == ASN_NULL) { /* valid request if ASN_NULL */
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/*
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* is it the right column?
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*/
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if (table_info->colnum == RESULT_COLUMN &&
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/*
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* and within the max boundries?
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*/
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*(table_info->indexes->val.integer) <= MAX_COLONE &&
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*(table_info->indexes->next_variable->val.integer)
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<= MAX_COLTWO) {
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/*
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* then, the result is column1 * column2
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*/
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result = *(table_info->indexes->val.integer) *
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*(table_info->indexes->next_variable->val.integer);
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snmp_set_var_typed_value(var, ASN_INTEGER,
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(u_char *) & result,
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sizeof(result));
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}
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}
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break;
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}
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requests = requests->next;
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}
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return SNMP_ERR_NOERROR;
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}
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#endif // XXX Hardcoded
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#define TESTHANDLER_SET_NAME "my_test"
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int
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my_test_instance_handler(netsnmp_mib_handler *handler,
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netsnmp_handler_registration *reginfo,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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static u_long accesses = 42;
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u_long *accesses_cache = NULL;
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clicon_debug(1, "%s", __FUNCTION__);
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switch (reqinfo->mode) {
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case MODE_GET:
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snmp_set_var_typed_value(requests->requestvb, ASN_UNSIGNED,
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(u_char *) & accesses, sizeof(accesses));
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break;
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#ifndef NETSNMP_NO_WRITE_SUPPORT
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case MODE_SET_RESERVE1:
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if (requests->requestvb->type != ASN_UNSIGNED)
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netsnmp_set_request_error(reqinfo, requests,
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SNMP_ERR_WRONGTYPE);
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break;
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case MODE_SET_RESERVE2:
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/*
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* store old info for undo later
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*/
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accesses_cache = netsnmp_memdup(&accesses, sizeof(accesses));
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if (accesses_cache == NULL) {
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netsnmp_set_request_error(reqinfo, requests,
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SNMP_ERR_RESOURCEUNAVAILABLE);
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return SNMP_ERR_NOERROR;
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}
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netsnmp_request_add_list_data(requests,
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netsnmp_create_data_list
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(TESTHANDLER_SET_NAME,
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accesses_cache, free));
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break;
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case MODE_SET_ACTION:
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/*
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* update current
|
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*/
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accesses = *(requests->requestvb->val.integer);
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DEBUGMSGTL(("testhandler", "updated accesses -> %lu\n", accesses));
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break;
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case MODE_SET_UNDO:
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accesses =
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*((u_long *) netsnmp_request_get_list_data(requests,
|
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TESTHANDLER_SET_NAME));
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break;
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case MODE_SET_COMMIT:
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case MODE_SET_FREE:
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/*
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* nothing to do
|
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*/
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break;
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#endif /* NETSNMP_NO_WRITE_SUPPORT */
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}
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return SNMP_ERR_NOERROR;
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}
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int
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my_data_table_handler(netsnmp_mib_handler *handler,
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netsnmp_handler_registration *reginfo,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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char *column3;
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netsnmp_table_request_info *table_info;
|
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netsnmp_table_row *row;
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|
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clicon_debug(1, "%s", __FUNCTION__);
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|
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while (requests) {
|
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if (requests->processed) {
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requests = requests->next;
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continue;
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||||
}
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/*
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* extract our stored data and table info
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*/
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row = netsnmp_extract_table_row(requests);
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table_info = netsnmp_extract_table_info(requests);
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||||
if (!table_info || !row || !row->data)
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continue;
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column3 = (char *) row->data;
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/*
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||||
* there's only one column, we don't need to check if it's right
|
||||
*/
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||||
netsnmp_table_data_build_result(reginfo, reqinfo, requests, row,
|
||||
table_info->colnum,
|
||||
ASN_OCTET_STR, (u_char*)column3,
|
||||
strlen(column3));
|
||||
requests = requests->next;
|
||||
}
|
||||
return SNMP_ERR_NOERROR;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/*! Signal terminates process
|
||||
* Just set exit flag for proper exit in event loop
|
||||
|
|
@ -195,6 +549,7 @@ clixon_snmp_init(clicon_handle h,
|
|||
int logdst)
|
||||
{
|
||||
int retval = -1;
|
||||
char *sockpath = NULL;
|
||||
|
||||
clicon_debug(1, "%s", __FUNCTION__);
|
||||
if (logdst == CLICON_LOG_SYSLOG)
|
||||
|
|
@ -204,14 +559,22 @@ clixon_snmp_init(clicon_handle h,
|
|||
/* make a agentx client. */
|
||||
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
|
||||
|
||||
if ((sockpath = clicon_option_str(h, "CLICON_SNMP_AGENT_SOCK")) == NULL){
|
||||
clicon_err(OE_SNMP, 0, "CLICON_SNMP_AGENT_SOCK not set");
|
||||
goto done;
|
||||
}
|
||||
/* XXX: This should be configurable. */
|
||||
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET, "unix:/tmp/clixon_snmp.sock");
|
||||
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET, sockpath);
|
||||
|
||||
/* initialize the agent library */
|
||||
init_agent(__PROGRAM__);
|
||||
|
||||
/* XXX Hardcoded, replace this with generic MIB */
|
||||
#if 1
|
||||
init_testhandler();
|
||||
#else
|
||||
init_nstAgentSubagentObject(h);
|
||||
#endif
|
||||
|
||||
/* example-demon will be used to read example-demon.conf files. */
|
||||
init_snmp(__PROGRAM__);
|
||||
|
|
@ -266,7 +629,6 @@ snmp_terminate(clicon_handle h)
|
|||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*! Usage help routine
|
||||
* @param[in] h Clixon handle
|
||||
* @param[in] argv0 command line
|
||||
|
|
@ -468,6 +830,7 @@ main(int argc,
|
|||
|
||||
if (dbg)
|
||||
clicon_option_dump(h, dbg);
|
||||
/* main event loop */
|
||||
if (clixon_event_loop(h) < 0)
|
||||
goto done;
|
||||
retval = 0;
|
||||
|
|
|
|||
|
|
@ -182,6 +182,8 @@ BUSER=clicon
|
|||
|
||||
: ${clixon_backend:=clixon_backend}
|
||||
|
||||
: ${clixon_snmp:=$(type -p clixon_snmp)}
|
||||
|
||||
# Source the site-specific definitions for test script variables, if site.sh
|
||||
# exists. The variables defined in site.sh override any variables of the same
|
||||
# names in the environment in the current execution.
|
||||
|
|
|
|||
|
|
@ -17,12 +17,15 @@ if [ ${WITH_NETSNMP} != "yes" ]; then
|
|||
fi
|
||||
|
||||
snmpd=$(type -p snmpd)
|
||||
snmpget="$(type -p snmpget) -c public -v2c localhost:1161 "
|
||||
snmpset="$(type -p snmpset) -c public -v2c localhost:1161 "
|
||||
clixon_snmp="/usr/local/sbin/clixon_snmp"
|
||||
snmpget="$(type -p snmpget) -On -c public -v2c localhost:1161 "
|
||||
snmpset="$(type -p snmpset) -On -c public -v2c localhost:1161 "
|
||||
|
||||
cfg=$dir/conf_startup.xml
|
||||
fyang=$dir/clixon-example.yang
|
||||
|
||||
# AgentX unix socket
|
||||
SOCK=/tmp/clixon_snmp.sock
|
||||
|
||||
cat <<EOF > $cfg
|
||||
<clixon-config xmlns="http://clicon.org/config">
|
||||
<CLICON_CONFIGFILE>$cfg</CLICON_CONFIGFILE>
|
||||
|
|
@ -31,6 +34,7 @@ cat <<EOF > $cfg
|
|||
<CLICON_SOCK>$dir/$APPNAME.sock</CLICON_SOCK>
|
||||
<CLICON_BACKEND_PIDFILE>/var/tmp/$APPNAME.pidfile</CLICON_BACKEND_PIDFILE>
|
||||
<CLICON_XMLDB_DIR>$dir</CLICON_XMLDB_DIR>
|
||||
<CLICON_SNMP_AGENT_SOCK>unix:$SOCK</CLICON_SNMP_AGENT_SOCK>
|
||||
</clixon-config>
|
||||
EOF
|
||||
|
||||
|
|
@ -47,8 +51,8 @@ function testinit(){
|
|||
new "kill old snmp daemons"
|
||||
sudo killall snmpd
|
||||
|
||||
new "Starting snmpd"
|
||||
$snmpd --rwcommunity=public --master=agentx --agentXSocket=unix:/tmp/clixon_snmp.sock udp:127.0.0.1:1161
|
||||
new "Starting $snmpd --rwcommunity=public --master=agentx --agentXSocket=unix:/tmp/clixon_snmp.sock udp:127.0.0.1:1161"
|
||||
$snmpd --rwcommunity=public --master=agentx --agentXSocket=unix:$SOCK udp:127.0.0.1:1161
|
||||
|
||||
pgrep snmpd
|
||||
if [ $? != 0 ]; then
|
||||
|
|
@ -65,14 +69,14 @@ function testinit(){
|
|||
sudo pkill -f clixon_backend
|
||||
|
||||
new "Starting backend"
|
||||
start_backend -s init -f $cfg -- -s
|
||||
start_backend -s init -f $cfg
|
||||
|
||||
# Kill old clixon_snmp, if any
|
||||
new "Terminating any old clixon_snmp processes"
|
||||
sudo killall clixon_snmp
|
||||
|
||||
new "Starting clixon_snmp"
|
||||
$clixon_snmp -f $cfg &
|
||||
$clixon_snmp -f $cfg -D $DBG -l s &
|
||||
|
||||
sleep 1
|
||||
|
||||
|
|
@ -89,14 +93,16 @@ function testexit(){
|
|||
new "SNMP tests"
|
||||
testinit
|
||||
|
||||
OID=".1.2.3.6.1"
|
||||
|
||||
new "Test SNMP get for default value"
|
||||
expectpart "$($snmpget .1.3.6.1.4.1.8072.2.4.1.1.2.0)" 0 "NET-SNMP-EXAMPLES-MIB::netSnmpExamples.4.1.1.2.0 = INTEGER: 2"
|
||||
expectpart "$($snmpget $OID)" 0 "$OID = Gauge32: 42"
|
||||
|
||||
new "Set new value to OID"
|
||||
expectpart "$($snmpset .1.3.6.1.4.1.8072.2.4.1.1.2.0 i 1234)" 0 "NET-SNMP-EXAMPLES-MIB::netSnmpExamples.4.1.1.2.0 = INTEGER: 1234"
|
||||
expectpart "$($snmpset $OID u 1234)" 0 "$OID = Gauge32: 1234"
|
||||
|
||||
new "Get new value"
|
||||
expectpart "$($snmpget .1.3.6.1.4.1.8072.2.4.1.1.2.0)" 0 "NET-SNMP-EXAMPLES-MIB::netSnmpExamples.4.1.1.2.0 = INTEGER: 1234"
|
||||
expectpart "$($snmpget $OID)" 0 "$OID = Gauge32: 1234"
|
||||
|
||||
new "Cleaning up"
|
||||
testexit
|
||||
|
|
|
|||
|
|
@ -1132,5 +1132,17 @@ module clixon-config {
|
|||
0 means no limit";
|
||||
|
||||
}
|
||||
leaf CLICON_SNMP_AGENT_SOCK {
|
||||
type string;
|
||||
default "unix:/tmp/clixon_snmp.sock";
|
||||
description
|
||||
"String description of AgentX socket that clixon_snmp listens to.
|
||||
For example, for net-snmpd, the socket is created by using the following:
|
||||
--agentXSocket=unix:<path>
|
||||
This string currently only supports UNIX socket path.
|
||||
Note also that the user should consider setting permissions appropriately
|
||||
XXX: This should be in later yang revision and documented as added when
|
||||
merged with master";
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue