Hello ALL,
I am trying to work on snmpget and snmpset on an simple MIB that i have
created.
The objective of my subagent will be -
I have a simple text file which will contain only one word (eg either
Postgres or MySQL).
Now from the agent's machine i have to run a snmpset command for this file
which will change the content of this text file.
The following is a part of my MIB named "CONFILE-MIB"
confileModules OBJECT IDENTIFIER ::= { confileMIBObjects 1 }
confileServerName OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This is an object that simply supports a writable integer
when compiled into the agent. See
http://www.net-snmp.org/tutorial-5/toolkit/XXX for further
implementation details."
::= { confileModules 1 }
After creating this i have run the mib2c command for the above objetct
mib2c -c mib2c.scalar.conf confileServerName
This created the .c and .h files.
Now i edited the tempate .c file for MODEGET :
Here is a sample extract of it:
switch (reqinfo->mode) {
case MODE_GET:
parse_textfile(srv_name); /*this function parses my text file*/
srv_name_len=strlen(srv_name);
printf("Server name:%s ",srv_name);
snmp_set_var_typed_value(requests->requestvb, ASN_OCTET_STR,
(u_char
*)srv_name,srv_name_len);
break;
I commented remaining all cases and then i compiled it and run the subagent.
Queried the foolowing :
snmpget -v 2c -c democommunity localhost confileServerName.0
This gave me the correct o/p:
CONFILE-MIB::confileServerName.0 = STRING: Postgres
Now i need help in setting the instance value for the above object and this
should get reflected in my file.
The other cases of switch statement are as follows:
case MODE_SET_RESERVE1:
/*
* or you could use netsnmp_check_vb_type_and_size instead
*/
ret = netsnmp_check_vb_type(requests->requestvb, ASN_OCTET_STR);
if (ret != SNMP_ERR_NOERROR) {
netsnmp_set_request_error(reqinfo, requests, ret);
}
break;
case MODE_SET_RESERVE2:
/*
* XXX malloc "undo" storage buffer
*/
if ( /* XXX if malloc, or whatever, failed: */ ) {
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_RESOURCEUNAVAILABLE);
}
break;
case MODE_SET_FREE:
/*
* XXX: free resources allocated in RESERVE1 and/or
* RESERVE2. Something failed somewhere, and the states
* below won't be called.
*/
break;
case MODE_SET_ACTION:
/*
* XXX: perform the value change here
*/
if ( /* XXX: error? */ ) {
netsnmp_set_request_error(reqinfo, requests, /* some error */
);
}
break;
case MODE_SET_COMMIT:
/*
* XXX: delete temporary storage
*/
if ( /* XXX: error? */ ) {
/*
* try _really_really_ hard to never get to this point
*/
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_COMMITFAILED);
}
break;
case MODE_SET_UNDO:
/*
* XXX: UNDO and return to previous value for the object
*/
if ( /* XXX: error? */ ) {
/*
* try _really_really_ hard to never get to this point
*/
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_UNDOFAILED);
}
break;
Please tell me where do i make changes and what changes are to be made.
Thank's in advance
--
Hemant Soundankar
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