650 lines
19 KiB
C
650 lines
19 KiB
C
/*
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*
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***** BEGIN LICENSE BLOCK *****
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Copyright (C) 2022 Olof Hagsand and Kristofer Hallin
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This file is part of CLIXON.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 3 or later (the "GPL"),
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in which case the provisions of the GPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of the GPL, and not to allow others to
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use your version of this file under the terms of Apache License version 2,
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indicate your decision by deleting the provisions above and replace them with
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the notice and other provisions required by the GPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the Apache License version 2 or the GPL.
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***** END LICENSE BLOCK *****
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*/
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#ifdef HAVE_CONFIG_H
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#include "clixon_config.h" /* generated by config & autoconf */
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <signal.h>
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/* net-snmp */
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#include <net-snmp/net-snmp-config.h>
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#include <net-snmp/net-snmp-includes.h>
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#include <net-snmp/agent/net-snmp-agent-includes.h>
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/* cligen */
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#include <cligen/cligen.h>
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/* clicon */
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#include <clixon/clixon.h>
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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 /* scalar example */
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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 int 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_INTEGER,
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(u_char *) & accesses, sizeof(accesses));
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break;
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case MODE_SET_RESERVE1:
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if (requests->requestvb->type != ASN_INTEGER)
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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 -> %d\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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}
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return SNMP_ERR_NOERROR;
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}
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static void
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init_testscalar(void)
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{
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oid my_oid[] = { 1, 3, 6, 1, 4, 1, 8072, 2, 1, 1 };
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clicon_debug(1, "%s", __FUNCTION__);
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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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("netSnmpExampleInteger", my_test_instance_handler,
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my_oid, OID_LENGTH(my_oid),
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HANDLER_CAN_RWRITE));
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}
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#endif
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#if 1 /* table example */
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static netsnmp_table_data_set *table_set;
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/*
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* https://net-snmp.sourceforge.io/dev/agent/data_set_8c-example.html#_a0
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*/
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static void
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init_testtable(void)
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{
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netsnmp_table_row *row;
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/*
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* the OID we want to register our integer at. This should be the
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* * OID node for the entire table. In our case this is the
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* * netSnmpIETFWGTable oid definition
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*/
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oid my_oid[] = { 1, 3, 6, 1, 4, 1, 8072, 2, 2, 1 };
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/*
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* a debugging statement. Run the agent with -Dexample_data_set to see
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* * the output of this debugging statement.
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*/
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DEBUGMSGTL(("example_data_set",
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"Initalizing example dataset table\n"));
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/*
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* It's going to be the "working group chairs" table, since I'm
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* * sitting at an IETF convention while I'm writing this.
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* *
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* * column 1 = index = string = WG name
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* * column 2 = string = chair #1
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* * column 3 = string = chair #2 (most WGs have 2 chairs now)
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*/
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table_set = netsnmp_create_table_data_set("netSnmpIETFWGTable");
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/*
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* allow the creation of new rows via SNMP SETs
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*/
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table_set->allow_creation = 1;
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/*
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* set up what a row "should" look like, starting with the index
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*/
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netsnmp_table_dataset_add_index(table_set, ASN_OCTET_STR);
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/*
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* define what the columns should look like. both are octet strings here
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*/
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netsnmp_table_set_multi_add_default_row(table_set,
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/*
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* column 2 = OCTET STRING,
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* writable = 1,
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* default value = NULL,
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* default value len = 0
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*/
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2, ASN_OCTET_STR, 1, NULL, 0,
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/*
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* similar
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*/
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3, ASN_OCTET_STR, 1, NULL, 0,
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0 /* done */ );
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/*
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* register the table
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*/
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/*
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* if we wanted to handle specific data in a specific way, or note
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* * when requests came in we could change the NULL below to a valid
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* * handler method in which we could over ride the default
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* * behaviour of the table_dataset helper
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*/
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netsnmp_register_table_data_set(netsnmp_create_handler_registration
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("netSnmpIETFWGTable", NULL,
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my_oid, OID_LENGTH(my_oid),
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HANDLER_CAN_RWRITE), table_set, NULL);
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/*
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* create the a row for the table, and add the data
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*/
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row = netsnmp_create_table_data_row();
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/*
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* set the index to the IETF WG name "snmpv3"
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*/
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netsnmp_table_row_add_index(row, ASN_OCTET_STR, "snmpv3",
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strlen("snmpv3"));
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/*
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* set column 2 to be the WG chair name "Russ Mundy"
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*/
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netsnmp_set_row_column(row, 2, ASN_OCTET_STR,
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"Russ Mundy", strlen("Russ Mundy"));
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netsnmp_mark_row_column_writable(row, 2, 1); /* make writable via SETs */
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/*
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* set column 3 to be the WG chair name "David Harrington"
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*/
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netsnmp_set_row_column(row, 3, ASN_OCTET_STR, "David Harrington",
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strlen("David Harrington"));
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netsnmp_mark_row_column_writable(row, 3, 1); /* make writable via SETs */
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/*
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* add the row to the table
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*/
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netsnmp_table_dataset_add_row(table_set, row);
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/*
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* add the data, for the second row
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*/
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row = netsnmp_create_table_data_row();
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netsnmp_table_row_add_index(row, ASN_OCTET_STR, "snmpconf",
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strlen("snmpconf"));
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netsnmp_set_row_column(row, 2, ASN_OCTET_STR, "David Partain",
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strlen("David Partain"));
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netsnmp_mark_row_column_writable(row, 2, 1); /* make writable */
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netsnmp_set_row_column(row, 3, ASN_OCTET_STR, "Jon Saperia",
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strlen("Jon Saperia"));
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netsnmp_mark_row_column_writable(row, 3, 1); /* make writable */
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netsnmp_table_dataset_add_row(table_set, row);
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/*
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* Finally, this actually allows the "add_row" token it the
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* * snmpd.conf file to add rows to this table.
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* * Example snmpd.conf line:
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* * add_row netSnmpIETFWGTable eos "Glenn Waters" "Dale Francisco"
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*/
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netsnmp_register_auto_data_table(table_set, NULL);
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DEBUGMSGTL(("example_data_set", "Done initializing.\n"));
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}
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#endif /* table example */
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/*! Signal terminates process
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* Just set exit flag for proper exit in event loop
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*/
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static void
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clixon_snmp_sig_term(int arg)
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{
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clicon_log(LOG_NOTICE, "%s: %s: pid: %u Signal %d",
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__PROGRAM__, __FUNCTION__, getpid(), arg);
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/* This should ensure no more accepts or incoming packets are processed because next time eventloop
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* is entered, it will terminate.
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* However there may be a case of sockets closing rather abruptly for clients
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*/
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clixon_exit_set(1);
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}
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/*! Callback for single socket
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* This is a workaround for netsnmps API usiing fdset:s, instead an fdset is created before calling
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* the snmp api
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* @param[in] s Read socket
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* @param[in] arg Clixon handle
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*/
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static int
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clixon_snmp_input_cb(int s,
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void *arg)
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{
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int retval = -1;
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fd_set readfds;
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// clicon_handle h = (clicon_handle)arg;
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clicon_debug(1, "%s", __FUNCTION__);
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FD_ZERO(&readfds);
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FD_SET(s, &readfds);
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snmp_read(&readfds);
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retval = 0;
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// done:
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return retval;
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}
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/*! Get which sockets are used from SNMP API, the register single sockets into clixon event system
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*
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* This is a workaround for netsnmps API usiing fdset:s, instead an fdset is created before calling
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* the snmp api
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* if you use select(), see snmp_select_info() in snmp_api(3)
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* snmp_select_info(int *numfds, fd_set *fdset, struct timeval *timeout, int *block)
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* @see clixon_snmp_input_cb
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*/
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static int
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clixon_snmp_fdset_register(clicon_handle h)
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{
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int retval = -1;
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int numfds = 0;
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fd_set readfds;
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struct timeval timeout = { LONG_MAX, 0 };
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int block = 0;
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int nr;
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int i;
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FD_ZERO(&readfds);
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if ((nr = snmp_sess_select_info(NULL, &numfds, &readfds, &timeout, &block)) < 0){
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clicon_err(OE_SNMP, errno, "snmp_select_error");
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goto done;
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}
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for (i=0; i<numfds; i++){
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if (FD_ISSET(i, &readfds)){
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if (clixon_event_reg_fd(i, clixon_snmp_input_cb, h, "snmp socket") < 0)
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goto done;
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}
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}
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retval = 0;
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done:
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return retval;
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}
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/*! Init netsnmp agent connection
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* @param[in] h Clixon handle
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* @param[in] logdst Log destination, see clixon_log.h
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* @see snmp_terminate
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*/
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static int
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clixon_snmp_init(clicon_handle h,
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int logdst)
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{
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int retval = -1;
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char *sockpath = NULL;
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clicon_debug(1, "%s", __FUNCTION__);
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if (logdst == CLICON_LOG_SYSLOG)
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snmp_enable_calllog();
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else
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snmp_enable_stderrlog();
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/* make a agentx client. */
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netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
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if ((sockpath = clicon_option_str(h, "CLICON_SNMP_AGENT_SOCK")) == NULL){
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clicon_err(OE_SNMP, 0, "CLICON_SNMP_AGENT_SOCK not set");
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goto done;
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}
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/* XXX: This should be configurable. */
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netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET, sockpath);
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/* initialize the agent library */
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init_agent(__PROGRAM__);
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/* XXX Hardcoded, replace this with generic MIB */
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init_testscalar();
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init_testtable();
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/* example-demon will be used to read example-demon.conf files. */
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init_snmp(__PROGRAM__);
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if (set_signal(SIGTERM, clixon_snmp_sig_term, NULL) < 0){
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clicon_err(OE_DAEMON, errno, "Setting signal");
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goto done;
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}
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if (set_signal(SIGINT, clixon_snmp_sig_term, NULL) < 0){
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clicon_err(OE_DAEMON, errno, "Setting signal");
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goto done;
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}
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if (set_signal(SIGPIPE, SIG_IGN, NULL) < 0){
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clicon_err(OE_UNIX, errno, "Setting DIGPIPE signal");
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goto done;
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}
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/* Workaround for netsnmps API use of fdset:s instead of sockets */
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if (clixon_snmp_fdset_register(h) < 0)
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goto done;
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retval = 0;
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done:
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return retval;
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}
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/*! Clean and close all state of netconf process (but dont exit).
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* Cannot use h after this
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* @param[in] h Clixon handle
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*/
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static int
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snmp_terminate(clicon_handle h)
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{
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yang_stmt *yspec;
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cvec *nsctx;
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cxobj *x;
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shutdown_agent();
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clicon_rpc_close_session(h);
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if ((yspec = clicon_dbspec_yang(h)) != NULL)
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ys_free(yspec);
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if ((yspec = clicon_config_yang(h)) != NULL)
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ys_free(yspec);
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if ((nsctx = clicon_nsctx_global_get(h)) != NULL)
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cvec_free(nsctx);
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if ((x = clicon_conf_xml(h)) != NULL)
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xml_free(x);
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xpath_optimize_exit();
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clixon_event_exit();
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clicon_handle_exit(h);
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clixon_err_exit();
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clicon_log_exit();
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return 0;
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}
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/*! Usage help routine
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* @param[in] h Clixon handle
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* @param[in] argv0 command line
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*/
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static void
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usage(clicon_handle h,
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char *argv0)
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{
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fprintf(stderr, "usage:%s\n"
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"where options are\n"
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"\t-h\t\tHelp\n"
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"\t-D <level>\tDebug level\n"
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"\t-f <file>\tConfiguration file (mandatory)\n"
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"\t-l (e|o|s|f<file>) Log on std(e)rr, std(o)ut, (s)yslog(default), (f)ile\n"
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"\t-o \"<option>=<value>\"\tGive configuration option overriding config file (see clixon-config.yang)\n",
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argv0
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);
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exit(0);
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}
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int
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main(int argc,
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char **argv)
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{
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int retval = -1;
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int c;
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char *argv0 = argv[0];
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clicon_handle h;
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int logdst = CLICON_LOG_STDERR;
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struct passwd *pw;
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yang_stmt *yspec = NULL;
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char *str;
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uint32_t id;
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cvec *nsctx_global = NULL; /* Global namespace context */
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size_t cligen_buflen;
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size_t cligen_bufthreshold;
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int dbg = 0;
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size_t sz;
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/* Create handle */
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if ((h = clicon_handle_init()) == NULL)
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return -1;
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/* In the startup, logs to stderr & debug flag set later */
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clicon_log_init(__PROGRAM__, LOG_INFO, logdst);
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/* Set username to clixon handle. Use in all communication to backend */
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if ((pw = getpwuid(getuid())) == NULL){
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clicon_err(OE_UNIX, errno, "getpwuid");
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goto done;
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}
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if (clicon_username_set(h, pw->pw_name) < 0)
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goto done;
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while ((c = getopt(argc, argv, SNMP_OPTS)) != -1)
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switch (c) {
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case 'h' : /* help */
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usage(h, argv[0]);
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break;
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case 'D' : /* debug */
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if (sscanf(optarg, "%d", &dbg) != 1)
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usage(h, argv[0]);
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break;
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case 'f': /* override config file */
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if (!strlen(optarg))
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usage(h, argv[0]);
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clicon_option_str_set(h, "CLICON_CONFIGFILE", optarg);
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break;
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case 'l': /* Log destination: s|e|o */
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if ((logdst = clicon_log_opt(optarg[0])) < 0)
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usage(h, argv[0]);
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if (logdst == CLICON_LOG_FILE &&
|
|
strlen(optarg)>1 &&
|
|
clicon_log_file(optarg+1) < 0)
|
|
goto done;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Logs, error and debug to stderr or syslog, set debug level
|
|
*/
|
|
clicon_log_init(__PROGRAM__, dbg?LOG_DEBUG:LOG_INFO, logdst);
|
|
clicon_debug_init(dbg, NULL);
|
|
|
|
yang_init(h);
|
|
|
|
/* Find, read and parse configfile */
|
|
if (clicon_options_main(h) < 0)
|
|
goto done;
|
|
|
|
/* Now rest of options */
|
|
optind = 1;
|
|
opterr = 0;
|
|
while ((c = getopt(argc, argv, SNMP_OPTS)) != -1)
|
|
switch (c) {
|
|
case 'h' : /* help */
|
|
case 'D' : /* debug */
|
|
case 'f': /* config file */
|
|
case 'l': /* log */
|
|
break; /* see above */
|
|
case 'o':{ /* Configuration option */
|
|
char *val;
|
|
if ((val = index(optarg, '=')) == NULL)
|
|
usage(h, argv0);
|
|
*val++ = '\0';
|
|
if (clicon_option_add(h, optarg, val) < 0)
|
|
goto done;
|
|
break;
|
|
}
|
|
default:
|
|
usage(h, argv[0]);
|
|
break;
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
/* Access the remaining argv/argc options (after --) w clicon-argv_get() */
|
|
clicon_argv_set(h, argv0, argc, argv);
|
|
|
|
/* Init cligen buffers */
|
|
cligen_buflen = clicon_option_int(h, "CLICON_CLI_BUF_START");
|
|
cligen_bufthreshold = clicon_option_int(h, "CLICON_CLI_BUF_THRESHOLD");
|
|
cbuf_alloc_set(cligen_buflen, cligen_bufthreshold);
|
|
|
|
if ((sz = clicon_option_int(h, "CLICON_LOG_STRING_LIMIT")) != 0)
|
|
clicon_log_string_limit_set(sz);
|
|
|
|
/* Set default namespace according to CLICON_NAMESPACE_NETCONF_DEFAULT */
|
|
xml_nsctx_namespace_netconf_default(h);
|
|
|
|
/* Add (hardcoded) netconf features in case ietf-netconf loaded here
|
|
* Otherwise it is loaded in netconf_module_load below
|
|
*/
|
|
if (netconf_module_features(h) < 0)
|
|
goto done;
|
|
|
|
/* In case ietf-yang-metadata is loaded by application, handle annotation extension */
|
|
#if 0
|
|
if (yang_metadata_init(h) < 0)
|
|
goto done;
|
|
#endif
|
|
/* Create top-level yang spec and store as option */
|
|
if ((yspec = yspec_new()) == NULL)
|
|
goto done;
|
|
clicon_dbspec_yang_set(h, yspec);
|
|
|
|
/* Load Yang modules
|
|
* 1. Load a yang module as a specific absolute filename */
|
|
if ((str = clicon_yang_main_file(h)) != NULL){
|
|
if (yang_spec_parse_file(h, str, yspec) < 0)
|
|
goto done;
|
|
}
|
|
/* 2. Load a (single) main module */
|
|
if ((str = clicon_yang_module_main(h)) != NULL){
|
|
if (yang_spec_parse_module(h, str, clicon_yang_module_revision(h),
|
|
yspec) < 0)
|
|
goto done;
|
|
}
|
|
/* 3. Load all modules in a directory */
|
|
if ((str = clicon_yang_main_dir(h)) != NULL){
|
|
if (yang_spec_load_dir(h, str, yspec) < 0)
|
|
goto done;
|
|
}
|
|
/* Load clixon lib yang module */
|
|
if (yang_spec_parse_module(h, "clixon-lib", NULL, yspec) < 0)
|
|
goto done;
|
|
/* Load yang module library, RFC7895 */
|
|
if (yang_modules_init(h) < 0)
|
|
goto done;
|
|
/* Add netconf yang spec, used by netconf client and as internal protocol */
|
|
if (netconf_module_load(h) < 0)
|
|
goto done;
|
|
/* Here all modules are loaded
|
|
* Compute and set canonical namespace context
|
|
*/
|
|
if (xml_nsctx_yangspec(yspec, &nsctx_global) < 0)
|
|
goto done;
|
|
if (clicon_nsctx_global_set(h, nsctx_global) < 0)
|
|
goto done;
|
|
|
|
#if 0
|
|
/* Call start function is all plugins before we go interactive */
|
|
if (clixon_plugin_start_all(h) < 0)
|
|
goto done;
|
|
#endif
|
|
/* Get session id from backend hello */
|
|
clicon_session_id_set(h, getpid());
|
|
|
|
/* Send hello request to backend to get session-id back
|
|
* This is done once at the beginning of the session and then this is
|
|
* used by the client, even though new TCP sessions are created for
|
|
* each message sent to the backend.
|
|
*/
|
|
if (clicon_hello_req(h, &id) < 0)
|
|
goto done;
|
|
clicon_session_id_set(h, id);
|
|
|
|
/* Init snmp as subagent */
|
|
if (clixon_snmp_init(h, logdst) < 0)
|
|
goto done;
|
|
|
|
if (dbg)
|
|
clicon_option_dump(h, dbg);
|
|
/* main event loop */
|
|
if (clixon_event_loop(h) < 0)
|
|
goto done;
|
|
retval = 0;
|
|
done:
|
|
snmp_terminate(h);
|
|
clicon_log_init(__PROGRAM__, LOG_INFO, 0); /* Log on syslog no stderr */
|
|
clicon_log(LOG_NOTICE, "%s: %u Terminated", __PROGRAM__, getpid());
|
|
return retval;
|
|
}
|