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clixon/apps/snmp/snmp_lib.c
Olof hagsand 62a32faf9c SNMP frontend. New snmp_lib.[ch] and rearranged code into lib 
Test: renamed WITH_SNMP -> ENABLE_SNMP
2022-06-26 11:28:42 +02:00

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/*
*
***** BEGIN LICENSE BLOCK *****
Copyright (C) 2022 Olof Hagsand and Kristofer Hallin
This file is part of CLIXON.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 3 or later (the "GPL"),
in which case the provisions of the GPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of the GPL, and not to allow others to
use your version of this file under the terms of Apache License version 2,
indicate your decision by deleting the provisions above and replace them with
the notice and other provisions required by the GPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the Apache License version 2 or the GPL.
***** END LICENSE BLOCK *****
* See RFC 6643
* 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";
*
*/
#ifdef HAVE_CONFIG_H
#include "clixon_config.h" /* generated by config & autoconf */
#endif
#include <stdio.h>
#include <unistd.h>
#include <pwd.h>
#include <syslog.h>
#include <errno.h>
#include <sys/types.h>
#include <signal.h>
/* net-snmp */
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
/* cligen */
#include <cligen/cligen.h>
/* clicon */
#include <clixon/clixon.h>
#include "snmp_lib.h"
/*
* Local variables
*/
/* Mapping between yang keyword string <--> clixon constants
* Here is also the place where doc on some types store variables (cv)
*/
/* Mapping between smiv2 yang extension access string string <--> netsnmp handler codes (agent_handler.h)
* Here is also the place where doc on some types store variables (cv)
* see netsnmp_handler_registration_create()
*/
static const map_str2int snmp_access_map[] = {
{"read-only", HANDLER_CAN_RONLY}, /* HANDLER_CAN_GETANDGETNEXT */
{"read-write", HANDLER_CAN_RWRITE}, /* HANDLER_CAN_GETANDGETNEXT | HANDLER_CAN_SET */
{"not-accessible", 0}, // XXX
{"accessible-for-notify", 0}, // XXX
{NULL, -1}
};
/* Map between clixon and ASN.1 types.
* @see net-snmp/library/asn1.h
* @see union netsnmp_vardata in net-snmp/types.h
*/
static const map_str2int snmp_type_map[] = {
{"bool", ASN_BOOLEAN},
{"int32", ASN_INTEGER},
{"bits", ASN_BIT_STR},
{"string", ASN_OCTET_STR},
{"empty", ASN_NULL},
//XXX {"", ASN_OBJECT_ID},
// XXX {"", ASN_SEQUENCE},
// XXX {"", ASN_SET},
{NULL, -1}
};
/*! Translate from snmp string to int representation
* @note Internal snmpd, maybe find something in netsnmpd?
*/
int
snmp_modes_str2int(char *modes_str)
{
return clicon_str2int(snmp_access_map, modes_str);
}
/*!
*/
int
yang2snmp_types(yang_stmt *ys,
int *asn1_type,
enum cv_type *cvtype)
{
int retval = -1;
yang_stmt *yrestype; /* resolved type */
char *restype; /* resolved type */
char *origtype=NULL; /* original type */
/* Get yang type of leaf and trasnslate to ASN.1 */
if (yang_type_get(ys, &origtype, &yrestype, NULL, NULL, NULL, NULL, NULL) < 0)
goto done;
restype = yrestype?yang_argument_get(yrestype):NULL;
if (clicon_type2cv(origtype, restype, ys, cvtype) < 0)
goto done;
/* translate to asn.1 */
*asn1_type = clicon_str2int(snmp_type_map, restype);
clicon_debug(1, "%s type:%s", __FUNCTION__, restype);
retval = 0;
done:
return retval;
}
/*! Translate from yang/xml/clixon to SNMP/ASN.1
**
* The tran
* @param[in] valstr Clixon/yang/xml string value
* @param[in] cvtype Type of clixon type
* @param[out] snmpval Malloc:ed snmp type
* @param[out] snmplen Length of snmp type
* @retval 1 OK
* @retval 0 Invalid value
* @retval -1 Error
*/
int
type_yang2snmp(char *valstr,
enum cv_type cvtype,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests,
u_char **snmpval,
size_t *snmplen)
{
int retval = -1;
int ret;
char *reason = NULL;
size_t cvlen;
cg_var *cv;
clicon_debug(1, "%s", __FUNCTION__);
if (snmpval == NULL || snmplen == NULL){
clicon_err(OE_UNIX, EINVAL, "snmpval or snmplen is NULL");
goto done;
}
if ((cv = cv_new(cvtype)) == NULL){
clicon_err(OE_UNIX, errno, "cv_new");
goto done;
}
if ((ret = cv_parse1(valstr, cv, &reason)) < 0)
goto done;
if (ret == 0){
clicon_debug(1, "%s %s", __FUNCTION__, reason);
netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_WRONGTYPE);
goto fail;
}
cvlen = cv_len(cv);
if ((*snmpval = malloc(cvlen)) == NULL){
clicon_err(OE_UNIX, errno, "malloc");
goto done;
}
switch (cvtype){
case CGV_INT32:{
int i = cv_int32_get(cv);
memcpy(*snmpval, &i, cvlen);
*snmplen = cvlen;
break;
}
case CGV_STRING:{
strcpy((char*)*snmpval, cv_string_get(cv));
*snmplen = cvlen;
break;
}
default:
clicon_debug(1, "%s %s not supported", __FUNCTION__, cv_type2str(cvtype));
netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_WRONGTYPE);
goto fail;
break;
}
retval = 1;
done:
clicon_debug(1, "%s %d", __FUNCTION__, retval);
if (reason)
free(reason);
return retval;
fail:
retval = 0;
goto done;
}
/*! Construct an xpath from yang statement
* Recursively construct it to the top.
* @param[in] ys Yang statement
* @param[out] cb xpath as cbuf
* @retval 0 OK
* @retval -1 Error
* @note
* 1. This should really be in a core .c file, like clixon_yang, BUT
* 2. It is far from complete so maybe keep it here as a special case
*/
int
yang2xpath(yang_stmt *ys,
cbuf *cb)
{
yang_stmt *yp; /* parent */
int i;
cvec *cvk = NULL; /* vector of index keys */
int retval = -1;
if ((yp = yang_parent_get(ys)) == NULL){
clicon_err(OE_YANG, EINVAL, "yang expected parent %s", yang_argument_get(ys));
goto done;
}
if (yp != NULL && /* XXX rm */
yang_keyword_get(yp) != Y_MODULE &&
yang_keyword_get(yp) != Y_SUBMODULE){
if (yang2xpath(yp, cb) < 0) /* recursive call */
goto done;
if (yang_keyword_get(yp) != Y_CHOICE && yang_keyword_get(yp) != Y_CASE){
cprintf(cb, "/");
}
}
cprintf(cb, "/%s:", yang_find_myprefix(ys));
if (yang_keyword_get(ys) != Y_CHOICE && yang_keyword_get(ys) != Y_CASE)
cprintf(cb, "%s", yang_argument_get(ys));
switch (yang_keyword_get(ys)){
case Y_LIST: // XXX not xpaths
cvk = yang_cvec_get(ys); /* Use Y_LIST cache, see ys_populate_list() */
if (cvec_len(cvk))
cprintf(cb, "=");
/* Iterate over individual keys */
for (i=0; i<cvec_len(cvk); i++){
if (i)
cprintf(cb, ",");
cprintf(cb, "%%s");
}
break;
case Y_LEAF_LIST:
cprintf(cb, "=%%s");
break;
default:
break;
} /* switch */
retval = 0;
done:
return retval;
}
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