376 lines
11 KiB
C
376 lines
11 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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* See RFC 6643
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* Extensions are grouped in some categories, the one I have seen are, example:
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* 1. leaf
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* smiv2:max-access "read-write";
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* smiv2:oid "1.3.6.1.4.1.8072.2.1.1";
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* smiv2:defval "42"; (not always)
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* 2. container, list
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* smiv2:oid "1.3.6.1.4.1.8072.2.1";
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* 3. module level
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* smiv2:alias "netSnmpExamples" {
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* smiv2:oid "1.3.6.1.4.1.8072.2";
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*
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* SNMP messages:
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* 160 MODE_GETNEXT / SNMP_MSG_GET
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* 161 MODE_GET / SNMP_MSG_GETNEXT
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* 0 MODE_SET_RESERVE1
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* 1 MODE_SET_RESERVE2
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* 2 MODE_SET_ACTION
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* 3 MODE_SET_COMMIT
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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_register.h"
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#include "snmp_handler.h"
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#define IETF_YANG_SMIV2_NS "urn:ietf:params:xml:ns:yang:ietf-yang-smiv2"
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/*! Parse smiv2 extensions for YANG container/list
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*
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* Typical table:
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* container x {
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* smiv2:oid "1.3.6.1.4.1.8072.2.2.1";
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* list y{
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*
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* }
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* }
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* @param[in] h Clixon handle
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* @param[in] ys Mib-Yang node
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* @retval 0 OK
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* @retval -1 Error
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*/
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static int
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mib_yang_table(clicon_handle h,
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yang_stmt *ys)
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{
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int retval = SNMP_ERR_GENERR;
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netsnmp_handler_registration *nhreg;
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netsnmp_table_data_set *table;
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char *oidstr = NULL;
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oid oid1[MAX_OID_LEN] = {0,};
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size_t sz1 = MAX_OID_LEN;
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char *name;
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clixon_snmp_handle *sh;
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int ret;
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/* Get OID from parent container */
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if (yang_extension_value(ys, "oid", IETF_YANG_SMIV2_NS, NULL, &oidstr) < 0)
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goto done;
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if (oidstr == NULL)
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goto ok;
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if (snmp_parse_oid(oidstr, oid1, &sz1) == NULL){
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clicon_err(OE_SNMP, 0, "snmp_parse_oid");
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goto done;
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}
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name = yang_argument_get(ys);
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if ((table = netsnmp_create_table_data_set(name)) == NULL){
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clicon_err(OE_SNMP, errno, "netsnmp_create_table_data_set");
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goto done;
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}
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/* Userdata to pass around in netsmp callbacks
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* XXX: not deallocated
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*/
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if ((sh = malloc(sizeof(*sh))) == NULL){
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clicon_err(OE_UNIX, errno, "malloc");
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goto done;
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}
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memset(sh, 0, sizeof(*sh));
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sh->sh_h = h;
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sh->sh_ys = ys;
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sh->sh_table = table;
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memcpy(sh->sh_oid, oid1, sizeof(oid1));
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sh->sh_oidlen = sz1;
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if (clixon_table_create(table, ys, h) < 0)
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goto done;
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if ((nhreg = netsnmp_create_handler_registration(name,
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snmp_table_handler,
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oid1,
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sz1,
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HANDLER_CAN_RWRITE)) == NULL){
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clicon_err(OE_SNMP, errno, "netsnmp_create_handler_registration");
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goto done;
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}
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nhreg->my_reg_void = sh;
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if ((ret = netsnmp_register_table_data_set(nhreg, table, NULL)) != SNMPERR_SUCCESS){
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//XXX err return? clicon_err(OE_SNMP, ret, "netsnmp_register_table_data_set");
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// goto done;
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}
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(void)netsnmp_register_auto_data_table(table, NULL);
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clicon_debug(1, "%s %s registered", __FUNCTION__, oidstr);
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ok:
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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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/*! Parse smiv2 extensions for YANG leaf
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* Typical leaf:
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* smiv2:oid "1.3.6.1.4.1.8072.2.1.1";
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* smiv2:max-access "read-write";
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* smiv2:defval "42"; (optional)
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* @param[in] h Clixon handle
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* @param[in] ys Mib-Yang node
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* @retval 0 OK
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* @retval -1 Error
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*/
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static int
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mib_yang_leaf(clicon_handle h,
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yang_stmt *ys)
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{
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int retval = -1;
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netsnmp_handler_registration *nhreg = NULL;
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netsnmp_mib_handler *handler;
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int ret;
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char *modes_str = NULL;
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char *default_str = NULL;
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char *oidstr = NULL;
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oid oid1[MAX_OID_LEN] = {0,};
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size_t sz1 = MAX_OID_LEN;
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int modes;
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char *name;
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clixon_snmp_handle *sh;
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/* Get OID from leaf */
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if (yang_extension_value(ys, "oid", IETF_YANG_SMIV2_NS, NULL, &oidstr) < 0)
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goto done;
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if (oidstr == NULL)
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goto ok;
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if (snmp_parse_oid(oidstr, oid1, &sz1) == NULL){
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clicon_err(OE_SNMP, 0, "snmp_parse_oid");
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goto done;
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}
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if (yang_extension_value(ys, "max-access", IETF_YANG_SMIV2_NS, NULL, &modes_str) < 0)
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goto done;
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#if 1 /* Sanity check of types */
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if (type_yang2asn1(ys, NULL) < 0)
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goto done;
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#endif
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/* Get modes (access) read-only, read-write, not-accessible, oaccessible-for-notify
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*/
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if (modes_str == NULL)
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goto ok;
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modes = snmp_access_str2int(modes_str);
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/* SMI default value, How is this different from yang defaults?
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*/
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if (yang_extension_value(ys, "defval", IETF_YANG_SMIV2_NS, NULL, &default_str) < 0)
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goto done;
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name = yang_argument_get(ys);
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if ((handler = netsnmp_create_handler(name, snmp_scalar_handler)) == NULL){
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clicon_err(OE_SNMP, errno, "netsnmp_create_handler");
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goto done;
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}
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/* Userdata to pass around in netsmp callbacks
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* XXX: not deallocated
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*/
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if ((sh = malloc(sizeof(*sh))) == NULL){
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clicon_err(OE_UNIX, errno, "malloc");
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goto done;
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}
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memset(sh, 0, sizeof(*sh));
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sh->sh_h = h;
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sh->sh_ys = ys;
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memcpy(sh->sh_oid, oid1, sizeof(oid1));
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sh->sh_oidlen = sz1;
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sh->sh_default = default_str;
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if ((nhreg = netsnmp_handler_registration_create(name, handler,
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oid1, sz1,
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modes)) == NULL){
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clicon_err(OE_SNMP, errno, "netsnmp_handler_registration_create");
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netsnmp_handler_free(handler);
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goto done;
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}
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nhreg->my_reg_void =(void*)sh;
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/*
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* XXX: nhreg->agent_data
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*/
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if ((ret = netsnmp_register_instance(nhreg)) < 0){
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/* XXX Failures are MIB_REGISTRATION_FAILED and MIB_DUPLICATE_REGISTRATION. */
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clicon_err(OE_SNMP, ret, "netsnmp_register_instance");
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goto done;
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}
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clicon_debug(1, "%s %s registered", __FUNCTION__, oidstr);
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ok:
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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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/*! Traverse mib-yang tree, identify scalars and tables, register OID and callbacks
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*
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* The tree is traversed depth-first, which at least guarantees that a parent is
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* traversed before a child.
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* Extensions are grouped in some categories, the one I have seen are, example:
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* 1. leaf
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* smiv2:max-access "read-write";
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* smiv2:oid "1.3.6.1.4.1.8072.2.1.1";
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* smiv2:defval "42"; (not always)
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* 2. container, list
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* smiv2:oid "1.3.6.1.4.1.8072.2.1";
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* 3. module level
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* smiv2:alias "netSnmpExamples" {
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* smiv2:oid "1.3.6.1.4.1.8072.2";
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* @param[in] h Clixon handle
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* @param[in] yn yang node
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* @retval 0 OK, all nodes traversed
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* @retval -1 Error, aborted at first error encounter
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*/
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static int
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mib_traverse(clicon_handle h,
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yang_stmt *yn)
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{
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int retval = -1;
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yang_stmt *ys = NULL;
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yang_stmt *yp;
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int ret;
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enum rfc_6020 keyw;
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keyw = yang_keyword_get(yn);
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switch(keyw){
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case Y_LEAF:
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if (mib_yang_leaf(h, yn) < 0)
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goto done;
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break;
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case Y_CONTAINER: /* See list case */
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break;
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case Y_LIST: /* If parent is container -> identify as table */
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yp = yang_parent_get(yn);
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if (yang_keyword_get(yp) == Y_CONTAINER){
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if (mib_yang_table(h, yp) < 0)
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goto done;
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goto ok; /* Dont traverse child leafs further */
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}
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break;
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default:
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break;
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}
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/* Traverse data nodes in tree (module is special case */
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ys = NULL;
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if (yang_schemanode(yn) || keyw == Y_MODULE|| keyw == Y_SUBMODULE)
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while ((ys = yn_each(yn, ys)) != NULL) {
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if ((ret = mib_traverse(h, ys)) < 0)
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goto done;
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if (ret > 0){
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retval = ret;
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goto done;
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}
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}
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ok:
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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 mib-translated yangs and register callbacks by traversing the yang
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*
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* @þaram[in] h Clixon handle
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* @retval 0 OK
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* @retval -1 Error
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*/
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int
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clixon_snmp_traverse_mibyangs(clicon_handle h)
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{
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int retval = -1;
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char *modname;
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cxobj *x;
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yang_stmt *yspec;
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yang_stmt *ymod;
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/* XXX Hardcoded, replace this with generic MIB */
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if ((yspec = clicon_dbspec_yang(h)) == NULL){
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clicon_err(OE_FATAL, 0, "No DB_SPEC");
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goto done;
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}
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x = NULL;
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while ((x = xml_child_each(clicon_conf_xml(h), x, CX_ELMNT)) != NULL) {
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if (strcmp(xml_name(x), "CLICON_SNMP_MIB") != 0)
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continue;
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if ((modname = xml_body(x)) == NULL)
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continue;
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clicon_debug(1, "%s %s: \"%s\"", __FUNCTION__, xml_name(x), modname);
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/* Note, here we assume the Yang is loaded by some other mechanism and
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* error if it not found.
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* Alternatively, that YANG could be loaded.
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* Problem is, if clixon_snmp has not loaded it, has backend done it?
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* What happens if backend has not loaded it?
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*/
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if ((ymod = yang_find(yspec, Y_MODULE, modname)) == NULL){
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clicon_err(OE_YANG, 0, "Mib-translated-yang %s not loaded", modname);
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goto done;
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}
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/* Recursively traverse the mib-yang to find extensions */
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if (mib_traverse(h, ymod) < 0)
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goto done;
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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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