708 lines
20 KiB
C
708 lines
20 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_mib_yang.h"
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#define IETF_YANG_SMIV2_NS "urn:ietf:params:xml:ns:yang:ietf-yang-smiv2"
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/*
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* Local Types
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*/
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/* Userdata to pass around in netsmp callbacks
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*/
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struct clixon_snmp_handle {
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clicon_handle sh_h;
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yang_stmt *sh_ys;
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oid sh_oid[MAX_OID_LEN]; /* OID for debug, may be removed? */
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size_t sh_oidlen;
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char *sh_default; /* MIB default value leaf only */
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netsnmp_table_data_set *sh_table; /* table struct, table only */
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};
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typedef struct clixon_snmp_handle clixon_snmp_handle;
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int clixon_table_create(netsnmp_table_data_set *table, yang_stmt *ys, clicon_handle h)
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{
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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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cxobj *xerr;
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char *xpath;
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cxobj *xtable;
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cxobj *xe;
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cxobj *xleaf;
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int i;
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char *valstr;
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netsnmp_table_row *row, *tmprow;
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if (xml_nsctx_yang(ys, &nsc) < 0)
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goto done;
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/* XXX just for yang2xpath */
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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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if (yang2xpath(ys, cb) < 0)
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goto done;
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xpath = cbuf_get(cb);
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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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netsnmp_table_dataset_add_index(table, ASN_OCTET_STR);
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netsnmp_table_set_multi_add_default_row(table, 2, ASN_OCTET_STR, 1, NULL, 0, 3, ASN_OCTET_STR, 1, NULL, 0, 0);
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if ((xtable = xpath_first(xt, nsc, "%s", xpath)) != NULL) {
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for (tmprow = table->table->first_row; tmprow; tmprow = tmprow->next)
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netsnmp_table_dataset_remove_and_delete_row(table, tmprow);
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xe = NULL; /* Loop thru entries in table */
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while ((xe = xml_child_each(xtable, xe, CX_ELMNT)) != NULL) {
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row = netsnmp_create_table_data_row();
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xleaf = NULL; /* Loop thru leafs in entry */
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i = 1; /* tableindex start at 1 */
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while ((xleaf = xml_child_each(xe, xleaf, CX_ELMNT)) != NULL) {
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valstr = xml_body(xleaf);
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if (i == 1) // Assume first netry is key XXX should check YANG
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netsnmp_table_row_add_index(row, ASN_OCTET_STR, valstr, strlen(valstr));
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else{
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netsnmp_set_row_column(row, i, ASN_OCTET_STR, valstr, strlen(valstr));
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netsnmp_mark_row_column_writable(row, i, 1);
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}
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i++;
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}
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netsnmp_table_dataset_add_row(table, row);
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}
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}
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done:
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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 (cb)
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cbuf_free(cb);
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return 0;
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}
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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 = -1;
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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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clixon_table_create(table, ys, h);
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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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cbuf *cb = NULL;
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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;
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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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/*
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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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/* XXX just for yang2xpath */
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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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if (yang2xpath(ys, cb) < 0)
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goto done;
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xpath = cbuf_get(cb);
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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 (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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if (cb)
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cbuf_free(cb);
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return retval;
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}
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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 = -1;
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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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clixon_table_create(table, ys, h);
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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){
|
|
//XXX err return? clicon_err(OE_SNMP, ret, "netsnmp_register_table_data_set");
|
|
// goto done;
|
|
|
|
}
|
|
(void)netsnmp_register_auto_data_table(table, NULL);
|
|
|
|
clicon_debug(1, "%s %s registered", __FUNCTION__, oidstr);
|
|
ok:
|
|
retval = 0;
|
|
done:
|
|
return retval;
|
|
}
|
|
|
|
/*! Parse smiv2 extensions for YANG leaf
|
|
* Typical leaf:
|
|
* smiv2:oid "1.3.6.1.4.1.8072.2.1.1";
|
|
* smiv2:max-access "read-write";
|
|
* smiv2:defval "42"; (optional)
|
|
* @param[in] h Clixon handle
|
|
* @param[in] ys Mib-Yang node
|
|
* @retval 0 OK
|
|
* @retval -1 Error
|
|
*/
|
|
static int
|
|
mib_yang_leaf(clicon_handle h,
|
|
yang_stmt *ys)
|
|
{
|
|
int retval = -1;
|
|
netsnmp_handler_registration *nhreg = NULL;
|
|
netsnmp_mib_handler *handler;
|
|
int ret;
|
|
char *modes_str = NULL;
|
|
char *default_str = NULL;
|
|
char *oidstr = NULL;
|
|
oid oid1[MAX_OID_LEN] = {0,};
|
|
size_t sz1 = MAX_OID_LEN;
|
|
int modes;
|
|
char *name;
|
|
clixon_snmp_handle *sh;
|
|
|
|
/* Get OID from leaf */
|
|
if (yang_extension_value(ys, "oid", IETF_YANG_SMIV2_NS, NULL, &oidstr) < 0)
|
|
goto done;
|
|
if (oidstr == NULL)
|
|
goto ok;
|
|
if (snmp_parse_oid(oidstr, oid1, &sz1) == NULL){
|
|
clicon_err(OE_SNMP, 0, "snmp_parse_oid");
|
|
goto done;
|
|
}
|
|
if (yang_extension_value(ys, "max-access", IETF_YANG_SMIV2_NS, NULL, &modes_str) < 0)
|
|
goto done;
|
|
|
|
/* Get modes (access) read-only, read-write, not-accessible, oaccessible-for-notify
|
|
*/
|
|
if (modes_str == NULL)
|
|
goto ok;
|
|
modes = snmp_access_str2int(modes_str);
|
|
|
|
/* SMI default value, How is this different from yang defaults?
|
|
*/
|
|
if (yang_extension_value(ys, "defval", IETF_YANG_SMIV2_NS, NULL, &default_str) < 0)
|
|
goto done;
|
|
|
|
name = yang_argument_get(ys);
|
|
|
|
if ((handler = netsnmp_create_handler(name, snmp_scalar_handler)) == NULL){
|
|
clicon_err(OE_SNMP, errno, "netsnmp_create_handler");
|
|
goto done;
|
|
}
|
|
|
|
/* Userdata to pass around in netsmp callbacks
|
|
* XXX: not deallocated
|
|
*/
|
|
if ((sh = malloc(sizeof(*sh))) == NULL){
|
|
clicon_err(OE_UNIX, errno, "malloc");
|
|
goto done;
|
|
}
|
|
memset(sh, 0, sizeof(*sh));
|
|
sh->sh_h = h;
|
|
sh->sh_ys = ys;
|
|
memcpy(sh->sh_oid, oid1, sizeof(oid1));
|
|
sh->sh_oidlen = sz1;
|
|
sh->sh_default = default_str;
|
|
if ((nhreg = netsnmp_handler_registration_create(name,
|
|
handler,
|
|
oid1,
|
|
sz1,
|
|
modes)) == NULL){
|
|
clicon_err(OE_SNMP, errno, "netsnmp_handler_registration_create");
|
|
netsnmp_handler_free(handler);
|
|
goto done;
|
|
}
|
|
nhreg->my_reg_void =(void*)sh;
|
|
/*
|
|
* XXX: nhreg->agent_data
|
|
*/
|
|
if ((ret = netsnmp_register_instance(nhreg)) < 0){
|
|
/* XXX Failures are MIB_REGISTRATION_FAILED and MIB_DUPLICATE_REGISTRATION. */
|
|
clicon_err(OE_SNMP, ret, "netsnmp_register_instance");
|
|
goto done;
|
|
}
|
|
clicon_debug(1, "%s %s registered", __FUNCTION__, oidstr);
|
|
ok:
|
|
retval = 0;
|
|
done:
|
|
return retval;
|
|
}
|
|
|
|
/*! Traverse mib-yang tree, identify scalars and tables, register OID and callbacks
|
|
*
|
|
* The tree is traversed depth-first, which at least guarantees that a parent is
|
|
* traversed before a child.
|
|
* Extensions are grouped in some categories, the one I have seen are, example:
|
|
* 1. leaf
|
|
* smiv2:max-access "read-write";
|
|
* smiv2:oid "1.3.6.1.4.1.8072.2.1.1";
|
|
* smiv2:defval "42"; (not always)
|
|
* 2. container, list
|
|
* smiv2:oid "1.3.6.1.4.1.8072.2.1";
|
|
* 3. module level
|
|
* smiv2:alias "netSnmpExamples" {
|
|
* smiv2:oid "1.3.6.1.4.1.8072.2";
|
|
|
|
* @param[in] h Clixon handle
|
|
* @param[in] yn yang node
|
|
* @retval 0 OK, all nodes traversed
|
|
* @retval -1 Error, aborted at first error encounter
|
|
*/
|
|
static int
|
|
mib_traverse(clicon_handle h,
|
|
yang_stmt *yn)
|
|
{
|
|
int retval = -1;
|
|
yang_stmt *ys = NULL;
|
|
yang_stmt *yp;
|
|
int ret;
|
|
|
|
switch(yang_keyword_get(yn)){
|
|
case Y_LEAF:
|
|
if (mib_yang_leaf(h, yn) < 0)
|
|
goto done;
|
|
break;
|
|
case Y_CONTAINER: /* See list case */
|
|
break;
|
|
case Y_LIST: /* If parent is container -> identify as table */
|
|
yp = yang_parent_get(yn);
|
|
if (yang_keyword_get(yp) == Y_CONTAINER){
|
|
if (mib_yang_table(h, yp) < 0)
|
|
goto done;
|
|
goto ok; /* Dont traverse child leafs further */
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
ys = NULL;
|
|
while ((ys = yn_each(yn, ys)) != NULL) {
|
|
if ((ret = mib_traverse(h, ys)) < 0)
|
|
goto done;
|
|
if (ret > 0){
|
|
retval = ret;
|
|
goto done;
|
|
}
|
|
}
|
|
ok:
|
|
retval = 0;
|
|
done:
|
|
return retval;
|
|
}
|
|
|
|
/*! Init mib-translated yangs and register callbacks by traversing the yang
|
|
*
|
|
* @þaram[in] h Clixon handle
|
|
* @retval 0 OK
|
|
* @retval -1 Error
|
|
*/
|
|
int
|
|
clixon_snmp_mib_yangs(clicon_handle h)
|
|
{
|
|
int retval = -1;
|
|
char *modname;
|
|
cxobj *x;
|
|
yang_stmt *yspec;
|
|
yang_stmt *ymod;
|
|
|
|
/* XXX Hardcoded, replace this with generic MIB */
|
|
if ((yspec = clicon_dbspec_yang(h)) == NULL){
|
|
clicon_err(OE_FATAL, 0, "No DB_SPEC");
|
|
goto done;
|
|
}
|
|
x = NULL;
|
|
while ((x = xml_child_each(clicon_conf_xml(h), x, CX_ELMNT)) != NULL) {
|
|
if (strcmp(xml_name(x), "CLICON_SNMP_MIB") != 0)
|
|
continue;
|
|
if ((modname = xml_body(x)) == NULL)
|
|
continue;
|
|
clicon_debug(1, "%s %s: \"%s\"", __FUNCTION__, xml_name(x), modname);
|
|
/* Note, here we assume the Yang is loaded by some other mechanism and
|
|
* error if it not found.
|
|
* Alternatively, that YANG could be loaded.
|
|
* Problem is, if clixon_snmp has not loaded it, has backend done it?
|
|
* What happens if backend has not loaded it?
|
|
*/
|
|
if ((ymod = yang_find(yspec, Y_MODULE, modname)) == NULL){
|
|
clicon_err(OE_YANG, 0, "Mib-translated-yang %s not loaded", modname);
|
|
goto done;
|
|
}
|
|
/* Recursively traverse the mib-yang to find extensions */
|
|
if (mib_traverse(h, ymod) < 0)
|
|
goto done;
|
|
}
|
|
retval = 0;
|
|
done:
|
|
return retval;
|
|
}
|