SNMP frontend, restructure files
Split snmp_mib_yang.c into: snmp_register.[ch] and snmp_handler.[ch]
This commit is contained in:
Olof hagsand
parent
f905f66efa
commit
ef604be610
8 changed files with 463 additions and 87 deletions
310
apps/snmp/snmp_handler.c
Normal file
310
apps/snmp/snmp_handler.c
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@ -0,0 +1,310 @@
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/*
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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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#include <assert.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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#include "snmp_lib.h"
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#include "snmp_handler.h"
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/*! SNMP table operation handlre
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* Callorder: 161,160,.... 0, 1,2,3, 160,161,...
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* see https://net-snmp.sourceforge.io/dev/agent/data_set_8c-example.html#_a0
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*/
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int
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snmp_table_handler(netsnmp_mib_handler *handler,
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netsnmp_handler_registration *nhreg,
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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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int retval = SNMP_ERR_GENERR;
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clixon_snmp_handle *sh;
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netsnmp_table_data_set *table;
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yang_stmt *ys;
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clicon_handle h;
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yang_stmt *ylist;
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cvec *nsc = NULL;
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cxobj *xt = NULL;
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cbuf *cb = NULL;
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clicon_debug(1, "%s %s %s", __FUNCTION__,
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handler->handler_name,
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snmp_msg_int2str(reqinfo->mode));
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sh = (clixon_snmp_handle*)nhreg->my_reg_void;
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ys = sh->sh_ys;
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h = sh->sh_h;
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table = sh->sh_table;
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if ((ylist = yang_find(ys, Y_LIST, NULL)) == NULL)
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goto ok;
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if (clixon_table_create(table, ys, h) < 0)
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goto done;
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switch(reqinfo->mode){
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case MODE_GETNEXT: // 160
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break;
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case MODE_GET: // 160
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case MODE_SET_RESERVE1:
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case MODE_SET_RESERVE2:
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case MODE_SET_ACTION:
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case MODE_SET_COMMIT:
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break;
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}
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ok:
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retval = SNMP_ERR_NOERROR;
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done:
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if (xt)
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xml_free(xt);
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if (cb)
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cbuf_free(cb);
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if (nsc)
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xml_nsctx_free(nsc);
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return retval;
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}
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/*! SNMP Scalar operation handler
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* Calls order: READ:160,
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* WRITE: 0, 1, 2, 3,
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* MODE_SET_RESERVE1, MODE_SET_RESERVE2, MODE_SET_ACTION, MODE_SET_COMMIT
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*
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*/
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int
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snmp_scalar_handler(netsnmp_mib_handler *handler,
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netsnmp_handler_registration *nhreg,
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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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int retval = -1;
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clixon_snmp_handle *sh;
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yang_stmt *ys;
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clicon_handle h;
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cg_var *cv = NULL;
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cxobj *xt = NULL;
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cxobj *xerr;
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cvec *nsc = NULL;
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cxobj *x;
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char *xpath = NULL;
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int asn1_type;
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enum cv_type cvtype;
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char *valstr;
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u_char *snmpval = NULL;
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size_t snmplen;
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int ret;
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netsnmp_variable_list *requestvb; /* sub of requests */
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cbuf *cb = NULL;
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/*
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* can be used to pass information on a per-pdu basis from a
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* helper to the later handlers
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netsnmp_agent_request_info *reqinfo,
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netsnmp_data_list *agent_data;
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netsnmp_free_agent_data_set()
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*/
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requestvb = requests->requestvb;
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if (0)
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fprintf(stderr, "%s %s %s\n", __FUNCTION__,
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handler->handler_name,
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snmp_msg_int2str(reqinfo->mode)
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);
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if (0)
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fprintf(stderr, "inclusive:%d\n",
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requests->inclusive
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);
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clicon_debug(1, "%s %s %s %d", __FUNCTION__,
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handler->handler_name,
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snmp_msg_int2str(reqinfo->mode),
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requests->inclusive);
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sh = (clixon_snmp_handle*)nhreg->my_reg_void;
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ys = sh->sh_ys;
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h = sh->sh_h;
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// fprint_objid(stderr, nhreg->rootoid, nhreg->rootoid_len);
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assert(sh->sh_oidlen == requestvb->name_length);
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assert(requestvb->name_length == nhreg->rootoid_len);
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assert(snmp_oid_compare(sh->sh_oid, sh->sh_oidlen,
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requestvb->name, requestvb->name_length) == 0);
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assert(snmp_oid_compare(requestvb->name, requestvb->name_length,
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nhreg->rootoid, nhreg->rootoid_len) == 0);
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#if 0 /* If oid match fails */
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netsnmp_set_request_error(reqinfo, requests,
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SNMP_NOSUCHOBJECT);
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return SNMP_ERR_NOERROR;
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#endif
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if (yang2snmp_types(ys, &asn1_type, &cvtype) < 0)
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goto done;
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/* see net-snmp/agent/snmp_agent.h / net-snmp/library/snmp.h */
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switch (reqinfo->mode) {
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case MODE_GET: // 160
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requestvb->type = asn1_type; // ASN_NULL on input
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/* get xpath: see yang2api_path_fmt / api_path2xpath
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New fn: yang2xpath?
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clicon_rpc_get()
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<rpc $DEFAULTNS><get><filter type=\"xpath\" select=\"/if:interfaces\" xmlns:if=\"urn:ietf:params:xml:ns:yang:ietf-interfaces\" /></get></rpc>"
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*/
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if (xml_nsctx_yang(ys, &nsc) < 0)
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goto done;
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if (yang2xpath(ys, &xpath) < 0)
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goto done;
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if (clicon_rpc_get(h, xpath, nsc, CONTENT_ALL, -1, &xt) < 0)
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goto done;
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if ((xerr = xpath_first(xt, NULL, "/rpc-error")) != NULL){
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clixon_netconf_error(xerr, "clicon_rpc_get", NULL);
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goto done;
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}
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/* Get value, either from xml, or smiv2 default */
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if ((x = xpath_first(xt, nsc, "%s", xpath)) != NULL) {
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valstr = xml_body(x);
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}
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else if ((valstr = sh->sh_default) != NULL)
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;
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else{
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netsnmp_set_request_error(reqinfo, requests, SNMP_NOSUCHINSTANCE);
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goto ok;
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}
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if ((ret = type_yang2snmp(valstr, cvtype, reqinfo, requests, &snmpval, &snmplen)) < 0)
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goto done;
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if (ret == 0)
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goto ok;
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/* 1. use cligen object and get rwa buf / size from that, OR
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* + have parse function from YANG
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* - does not have
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* 2. use union netsnmp_vardata and pass that here?
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* 3. Make cv2asn1 conversion function <--
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*/
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/* see snmplib/snmp_client.c */
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if (snmp_set_var_value(requestvb,
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snmpval,
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snmplen) != 0){
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clicon_err(OE_SNMP, 0, "snmp_set_var_value");
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goto done;
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}
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break;
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case MODE_GETNEXT: // 161
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assert(0); // Not seen?
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break;
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case MODE_SET_RESERVE1: // 0
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if (requestvb->type != asn1_type)
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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: // 1
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break;
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case MODE_SET_ACTION: // 2
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/*
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* update current
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*/
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/* yang2xpath -> xpath2xml
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* accesses = *(requestvb->val.integer);
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* rpc edit-config
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<data></data>
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*/
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if ((cb = cbuf_new()) == NULL){
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clicon_err(OE_UNIX, errno, "cbuf_new");
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goto done;
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}
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/*! XXX only int */
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cprintf(cb, "<config><NET-SNMP-EXAMPLES-MIB xmlns=\"urn:ietf:params:xml:ns:yang:smiv2:NET-SNMP-EXAMPLES-MIB\"><netSnmpExampleScalars><netSnmpExampleInteger>%ld</netSnmpExampleInteger></netSnmpExampleScalars></NET-SNMP-EXAMPLES-MIB></config>", *requestvb->val.integer);
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if (clicon_rpc_edit_config(h, "candidate", OP_MERGE, cbuf_get(cb)) < 0)
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goto done;
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break;
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case MODE_SET_UNDO: // 5
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if (clicon_rpc_discard_changes(h) < 0)
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goto done;
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break;
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case MODE_SET_COMMIT: // 3
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if (clicon_rpc_commit(h) < 0)
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goto done;
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break;
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case MODE_SET_FREE: // 4
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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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ok:
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retval = SNMP_ERR_NOERROR;
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done:
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if (snmpval)
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free(snmpval);
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if (cb)
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cbuf_free(cb);
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if (xpath)
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free(xpath);
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if (xt)
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xml_free(xt);
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if (nsc)
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xml_nsctx_free(nsc);
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if (cv)
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cv_free(cv);
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return retval;
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}
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