Hi Dave,
I found my mistake, I used
strlen(requests->requestvb->val.string) to find the length of the string, but
this is not null terminated string, so it is returning the longest string I've
ever set with snmpset, in this case "private"
if I use, requests->requestvb->val_len to retrieve the length, and use
strncpy(my_buff, requests->requestvb->val.string,
requests->requestvb->val_len);
my_buff[ requests->requestvb->val_len + 1] = '\0';
it works fine.
Thanks so much!!
Leo;
--- On Mon, 10/18/10, Dave Shield <d.t.shi...@liverpool.ac.uk> wrote:
From: Dave Shield <d.t.shi...@liverpool.ac.uk>
Subject: Re: problem encountered while issuing multiple snmpset on octetstring
oids
To: "Leo Lin" <hayashi_...@yahoo.com>
Cc: "Net-snmp-users" <net-snmp-users@lists.sourceforge.net>
Date: Monday, October 18, 2010, 7:31 AM
On 18 October 2010 15:13, Leo Lin <hayashi_...@yahoo.com> wrote:
> Then, I issue an snmpset and modify the contents to a strlen less than
> 'private' (7).
> snmpset does it right the first time, but consecutives calls to snmpset,
> gives me the remainder of 'private'
It sounds as if you are forgetting to add the null terminator to
your internal string buffer, when setting the new value.
> I used DEBUGMSGTL to track the len of requests->requestvb->val.string,
> and it shows me that for snmpset to "leo", the strlen is still 7 instead of 3.
What exactly do you mean by this?
What is the value of 'requests->requestvb->val_len' ?
Remember that the Net-SNMP library uses a (value+length) approach
to varbind values, rather than assuming all strings will be null-terminated.
> I also made sure that I've clear my buffer using
> memset(_myoid, '\0', _myoid_len);
That's the OID buffer.
What are you doing with the buffer that holds the string value?
Dave
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