Re: Re: 回复： Help using net-snmp

Hi,David ,I made it with your suggestion.

in excute phase: (both the agent and the manager were on ubuntu-10.10)

in the agent side, I wrote agent's  command function in the MODE_SET_COMMIT module,
it get the command string from the set-request package,and system it 

in the manager side ,I made a set-request package, send it.

and the agent excute it , it's wonderful !

By now ,I can send several commands and excute them on the agent via net-snmpsuch ,as "touch ","cal" ,etc.

but when I send "shutdown -h now" or "gedit &", it didn't work.

Then ,what's the reason ? because of the authority of the snmp user or X server ? How to solve this?

Best Regards

wade




发件人： David A 
发送时间： 2010-11-20  18:00:42 
收件人： 徐滕 
抄送： net-snmp-users 
主题： Re: 回复： Help using net-snmp 
 
Hi good to see you are progressing.  
Q1: you can shorten the timeout. That will help move stuff along. Or instead of looking for agents, you can maybe incorporate a protocol like bonjour or mdns? Google those and see. I forgot details on them
Q2: did you create an init_<module> and in there call the init function created by mib2c ? You also might want to make that one a set request, instead of get. 
Good luck
David
On Nov 20, 2010 1:44 AM, "徐滕" <[email protected]> wrote:
> Thanks David, and I still have to bother you with two questions.
> 
> By now ,my practice is :
> 
> I wrote my own mib which has two oids ,a vendorId (.1.3.6.1.4.1.8888.1, a string type ,read-only ,for detecting device) ,a commandId ((.1.3.6.1.4.1.8888.2, a string type, read-only ,for execute command on the agent) , add this mib to the agent
> 
> question 1 : in detecting phase:
> I send the get-request for oid vendorID to the lan subnet , once anyone return the vendorId I wanted , the manager recognise the responser . In my test case, polling 60 IPs cost 6 minutes, it's a little slow, is anyother more effective way to detecte devices I wanted?
> 
> question 2: in execute phase
> I want the agent to execute a command such as shutdown when the manager send a get-request for commandId, so ,I used the mib2c to generate .h and .c from the mib I defined myself , in the get-request-handler for commandId, I added a function system("shutdown -h now") , then compile these files to a dynamic library mylib.so , loaded it in the snmpd.conf on the agent ,restart snmpd service . but it doesn't work ,why ? How should I do ?
> 
> Thanks 
> 
> Best Regards
> 
> wade 
> 
> ------------------ 原始邮件 ------------------
> 发件人: "David A"<[email protected]>;
> 发送时间: 2010年11月20日(星期六) 凌晨0:43
> 收件人: "徐滕"<[email protected]>; 
> 抄送: "net-snmp-users"<[email protected]>; 
> 主题: Re: Help using net-snmp
> 
> 
> 
> Yes you would have to send requests to a range of IP addresses and see who answers back. Or maybe you can use some bonjour like protocol.
> 
> The manager can send requests to an agent that can trigger a command to be executed yes. 
> On Nov 18, 2010 6:48 PM, "徐滕" <[email protected]> wrote:
>> Hi,all:
>> 
>> I'm a fresh man to snmp, and now participating a project which has a manger on the console server,and a agent on several 
>> 
>> terminals such as pc or tc via lan . I cannot get my head arount how the manger detect the agent via lan ,should it brodcast a get-request to the lan ?
>> 
>> and next question is ,could the manger send data to the agent or excute a remote command on the agent via net-snmp ?
>> 
>> Could anyone help me?
>> 
>> Regards!
>> 
>> wade
>> 
>> 2010-11-19

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