Freenode?

[Steve Friedl]

Are there any thoughts about the #net-snmp channel and Freenode, which seems to 
be in quite an upheaval, with larger projects abandoning it for Libera.Chat, 
started by the wave of resigning freenode admins.

Ref:  https://lwn.net/Articles/856543/

For reasons nobody can remember, I (SJFriedl) am still a channel op on 
Freenode's #net-snmp, though I haven't done significant Net SNMP work in quite 
some time. 

I have "reserved" the #net-snmp channel on Libera.Chat but none of this is 
mine; have the powers that be thought about what to do with IRC?

I don't have a strong opinion one way or another.

Steve

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RE: Summary of meeting between NET-SNMP devs and ICEI

[Steve Friedl]

Wow, these are names from the past; I find it hard to believe there is any
legitimate need to support these going forward.

Steve - who's ported to almost all of those platforms

-Original Message-
From: Eric S. Raymond [mailto:e...@thyrsus.com] 
Sent: Wednesday, April 25, 2018 8:25 PM
To: Bart Van Assche 
Cc: Susan Sons ; net-snmp-coders@lists.sourceforge.net;
Robert Story 
Subject: Re: Summary of meeting between NET-SNMP devs and ICEI

Bart Van Assche :
> Which of the following files under include/net-snmp/system do you 
> think are still relevant today? No changes other than trivial changes 
> have been made to these files in the past ten years:
> 
> dynix.h irix.h osf5.h svr5.h ultrix.h

LOL. I've seen this movie before.  It's very common in codebases of this age
and size range.

Nuke them from orbit, sez I.
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https://icei.org Please visit their site and donate: the civilization you
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RE: C99 (was: Re: Fix patch for SF bug 2833)

[Steve Friedl]

net-snmp is expected to build on Windows, which gpsd does not; it's not
clear how much this impacts compiler choice.

-Original Message-
From: Eric S. Raymond [mailto:e...@thyrsus.com] 
Sent: Thursday, March 22, 2018 10:32 AM
To: Bill Fenner 
Cc: Net-SNMP Coders 
Subject: C99 (was: Re: Fix patch for SF bug 2833)

Bill Fenner :
> On Thu, Mar 22, 2018 at 9:16 AM, Eric S. Raymond  wrote:
> 
> > On the other hand, I question whether the extra overhead is a real 
> > issue in 2018.
> 
> 
> I have the same question, but know that I have no useful opinion here 
> - my "embedded system" ships with 4 gigs minimum, but the project has 
> more use cases than mine.

Bart's objection about changing the public ABI is a showstopper and I
wihdraw the suggestion.

On the other hand...

>For example, the project did decide to back off from introducing c99
constructs.

*This* is an issue about which I know something important that does not seem
to have percolated into general knowledge yet.

I lead the GPSD project, a daemon for handling GPSes and other geolocation
sources.  It's deployed *everywhere* - smartphones, driverless cars, marine
navigation systems, main battle tanks, drones and UAVs, first-responder comm
gear, you name it.

If GPSD makes an assumption that breaks any Unix build chain or portability
anywhere, I get a complaint right quick.  I've fielded dozens of these.
Maybe the weirdest one was due to actual signed chars on a 360 mainframe.

There came a point at which I got tired of seeing legacy ifdefs from ancient
big iron in my codebase. Thought about my options, decided to move to
assuming C99 and SuSv2. I shipped a point release on this premise expecting
at least some minor pushback from some odd legacy environment.

I heard not a peep, and never have since.  And this was in 2009.

If that's not enough, since 2015 I have led the NTPsec project.  Based on
GPSD experience we made the same decision to assume a C99/SuSv2 base.
With no problems whatsoever except that on old versions of MacOS one of the
time primitives is broken.

That's how I learned that the standards people won.  Our traditional
twitchiness about tossing out any portability shim back to the year zero is
obsolete.

And bear in mind that GPSD/NTPsec probably exercises a wider swathe of the
host API than snmpd does, so the test has been more stringent. GPSD has to
get deep into odd corners of the tty driver and kernel PPS; NTPsec gets even
further into system clock handling.

I can say with confidence that assuming C99 is *very* safe in 2018.
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RE: Access the SNMP Counters without increasing them

[Steve Friedl]

You probably can’t; these stats are maintained within the SNMP agent in a 
static array (defined in snmplib/snmp_api.c, and there’s no programmatic access 
to it other than through the agent interface that’s going to increment the 
counters.

 

From: Gustav Evertsson [mailto:m...@guzzzt.com] 
Sent: Thursday, May 02, 2013 11:49 PM
To: Tim Cox
Cc: net-snmp-coders@lists.sourceforge.net
Subject: Re: Access the SNMP Counters without increasing them

 

Thank you very much for the help.

My main issue is not to send the data to the GUI, the problem is to get it out 
of the net-snmp library. The find your data part in your suggestion. How do I 
read snmpInPkts, snmpOutPkts etc out of the library from C function calls?

/Gustav


On Thu, 2 May 2013 23:44:26 +0200
 Tim Cox timmiles...@gmx.ch wrote:
 
 
 
 It really depends on being able to see your agent's data from a
 program which is not itself SNMP and using sockets which are not
 SNMP's sockets
 
 I'm assuming you are talking about two different machines, one
 containing an agent and the other a manager
 
 You want to interrogate data which is in the SNMP agent's space
 without actually being that agent. If you are talking about an
 embedded system with a flat global address space, this is easy.
 Otherwise you may find it best to include your piece of enquiry code
 in your agent
 
 It doesn't sound important to me at all, but this is how you do it
 
 you don't use SNMP's sockets. You use one of the other 6
 available socket addresses on the target system
 
 It will be easiest if your new piece of code is a thread of the agent
 
 #include sys/socket.h
 #include netinet/in.h
 #include errno.h
 
 static struct sockaddr_in here  = { AF_INET,
 HTONS(A_NICE_PORT_NUMBER_MAYBE_44004) } ;
 static struct sockaddr_in there = { AF_INET } ;
 static int sixteen = 16;
 
 void listener()
 {
int s = socket(AF_INET, SOCK_DGRAM);
int x = bind(s, (struct sockaddr *) here, 16);
 
char data[DATA];
 
if (s  0) printf(yon's mingin\n);
else
{
   if (x  0) printf(yon's awfu\n);
   else
   {
  for (;;)
  {
 x = recvfrom(s, data, DATA, 0, (struct sockaddr *)
 there, sixteen);
 if (x  0) break
 

 /
 
 find your data and format your response
 
   
 /
 
 x = send(s, data, HOWEVER_LONG_YOUR_RESPONSE_IS, 0,
 (struct sockaddr *) there, 16);
  }
 
  printf(listener stopped %d\n, errno);
   }
}
 }
 
 and you need something in your GUI program to call this listener.
 Decide for yourself if it should block on response. I don't advise
 it. But I don't advise you to make this feature of your application
 so important in the first place
 
 #include sys/socket.h
 #include netinet/in.h
 #include errno.h
 
 int requestor(char *data)
 {
static struct sockaddr_in there  = { AF_INET,
 HTONS(A_NICE_PORT_NUMBER_MAYBE_44004),
   {
  REMOTE_NETWORK_ADDRESS } } ; 
static struct sockaddr_in  here = { AF_INET } ;
static int sixteen = 16;
  
static int s = -1;
 
int x;
 
   
if (s  0)
{
   s = socket(AF_INET, SOCK_DGRAM);
 
   if (s  0) return -1;
 
   x = bind(s, (struct sockaddr *) here, 16);
   if (x  0)
   {
  s = -1;
  return -2
   }
}
 
x = sendto(s, data, sizeof(enquiry), 0, (struct sockaddr *)
 there, 16);
of (x  0) return -3;
x = recvfrom(s, data, MAXIMUM, 0, (struct sockaddr *), there,
 sixteen);
if (x  0) return -4;
return x;
 }
 
 
 
 
 Am 02.05.2013 um 08:39 schrieb Gustav Evertsson:
 
  
  Can you describe the socket method a bit more? I have tested to
 implement it with these calls, but that will increase the counters:
  
  snmp_sess_init( session );
  session.peername = 127.0.0.1;
  
  SOCK_STARTUP;
  ss = snmp_open(session); 
  snmp_synch_response(ss, pdu, response);
  snmp_close(ss);
  SOCK_CLEANUP;
  
  /Gustav
  
  On Tue, 30 Apr 2013 15:44:56 +0200 (CEST)
   Tim Cox timmiles...@gmx.ch wrote:
  If this is really so important access the MIB
 variables
   from a socket program or decrement the send and receive
 counts by
   1 between acquiring and displaying  (you need a running count of
   course)Gesendet: Dienstag, 30. April 2013 um 15:35 Uhr
 Von:
   Gustav Evertsson m...@guzzzt.com An: Tim Cox
 timmiles...@gmx.ch
   Cc: net-snmp-coders@lists.sourceforge.net Betreff: Re: Access the
   SNMP Counters without increasing them   Yes, the problem is that
 they
   are increased when read from the GUI. They should only be
 increased
   when read from SNMP. When the user opens the GUI it is not
 visible
   that the counters comes from the SNMP interface and it therefore
   looks strange to the user. I could inform them that the request
 goes
   over 

RE: tcpdump for snmp packets

[Steve Friedl]

What does not work mean?

 

From: Ravi Kumar [mailto:mynets...@gmail.com] 
Sent: Monday, October 17, 2011 5:07 AM
To: net-snmp-coders
Subject: tcpdump for snmp packets

 

Hi All,

Can any one tell me how can i filter snmp packets using tcpdump ?
Following command does not work from me.

tcpdump -i  eth1  -T snmp  (src port 161 or 162)  -w  test.log





Thanks.

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RE: RFV: Disk calculation overflow

[Steve Friedl]

No, the variable it's dividing is long long - the missing dot was an error
in posting the patch (though I did all the testing with the right way).

Changing it from 100 to 100.0 would be a great plan.

Steve

-Original Message-
From: Dave Shield [mailto:d.t.shi...@liverpool.ac.uk] 
Sent: Thursday, September 22, 2011 2:20 PM
To: Niels Baggesen
Cc: Net-SNMP coders
Subject: Re: RFV: Disk calculation overflow

On 22 September 2011 22:05, Niels Baggesen n...@users.sourceforge.net
wrote:
 Den 22-09-2011 11:15, Dave Shield skrev:

 I've therefore applied a version of Steve's patch (using local float 
 variables rather than casts) to the 5.6, 5.7 and master code lines.

 It seems that you lost the period that made the 100 into a float :-(

But the variable that it's dividing is a float anyway, so does that matter?
If it does, then perhaps it would be clearer to use '100.0' rather than
'100.'

Dave


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RE: RFV: Disk calculation overflow

[Steve Friedl]

Then that's not what I based my patch on - somebody else snuck in those
floats. I tested on rc1, which I thought was current at the time (or at
least was the latest tarball at the time).

My code, which I tested quite a bit, is:

static int _percent( unsigned long long value, unsigned long long total ) {
/* avoid division by zero */
if (total == 0)
return 0;

float pct = (value * 100.) / total;

pct += 0.5;  /* rounding */

return (int) pct;
}

Steve

-Original Message-
From: Dave Shield [mailto:d.t.shi...@liverpool.ac.uk] 
Sent: Thursday, September 22, 2011 2:39 PM
To: Niels Baggesen; Steve Friedl
Cc: Net-SNMP coders
Subject: Re: RFV: Disk calculation overflow

On 22 September 2011 22:21, Steve Friedl st...@unixwiz.net wrote:
 No, the variable it's dividing is long long - the missing dot was an 
 error in posting the patch (though I did all the testing with the right
way).

Errr... no.
From the 5.7.1.rc3 tarball:

static int _percent( unsigned long long value, unsigned long long total ) {
float v=value, t=total, pct;

/* avoid division by zero */
if (total == 0)
return 0;

pct  = (v*100)/t;   /* Calculate percentage using floating point
   arithmetic, to avoid overflow errors */
pct += 0.5; /* rounding */
return (int)pct;
}


'v*100' is float times integer,
so surely the result should be float, as required?

Dave


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RE: RFV: Disk calculation overflow

[Steve Friedl]

 [is waiting for a patch]

Submitted; #3409692

Steve

-Original Message-
From: Wes Hardaker [mailto:harda...@users.sourceforge.net] 
Sent: Wednesday, September 14, 2011 4:23 PM
To: Steve Friedl
Cc: 'Bart Van Assche'; 'Dave Shield'; 'Net-SNMP coders'
Subject: Re: RFV: Disk calculation overflow

 On Fri, 2 Sep 2011 10:48:55 -0700, Steve Friedl st...@unixwiz.net
said:

SF There are other floats in that MIB, and I'd imagine that any 
SF compiler that could handle unsigned long long could deal with a float.

That's the really true part: with other floats already in the file, I agree
it's probably safest to simply use a float.

[is wating for a patch]
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Re: IPv6

[Steve Friedl]

On Mon, Sep 12, 2011 at 03:42:38PM +0200, Martin Knappe wrote:
 I have a very general question for a start. It seems to me that IPv6
 connectivity is not currently supported by net-snmp, is that correct?
 I was not able to:
 
 1) set up the snmp-agent to listen on v6-addresses and respond to requests
 
 2) send snmp traps with snmptrap or from within my own code with the C API
 
 Please, can someone confirm my observations or correct me if I'm wrong?

You didn't show how you tried to do it, but it's certainly supported via
snmpd. man snmpd shows that you can provide the listening address as:

  udp6:10161  listen on port 10161 on all IPv6 interfaces.

I presume traps work likewise with ipv6.

Steve

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RE: Which error code to choose?

[Steve Friedl]

Robert Story wrote:
 sorry for the delay, I took a little vacation.

Hmmm, I don't remember +3 votes for any vacation - did I miss something?

:-)


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RE: unable to run snmpd as non-root user

[Steve Friedl]

What does unable mean? What happens when you try?

-Original Message-
From: Ravi Kumar [mailto:mynets...@gmail.com] 
Sent: Monday, March 28, 2011 9:22 AM
To: net-snmp-coders
Subject: unable to run snmpd as non-root user

Hi,

Could any one tell me why the snmpd does not run with sudo as given below.

$ sudo /home/ravi/net-snmp-5.5/agent/snmpd -c
/home/ravi/net-snmp-5.5/local/snmpd.conf,/var/net-snmp/snmpd.conf -C -u
ravi

I am trying to run snmpd as root with sudo command on 161 port and switch
back to user ravi using -u option. User ravi is included in /etc/sudoers
file.


Thanks,
Ravi


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RE: unable to run snmpd as non-root user

[Steve Friedl]

Ok, well probably the next step is to turn on some debugging and/or look
around at system logs. 

What else have you tried to try to figure this out yourself? If you run it
*without* -u ravi  does it make any difference?  Could it be that it's not
finding the libraries because sudo changes the path? What if you sudo bash
and then run it directly that way?


-Original Message-
From: Ravi Kumar [mailto:mynets...@gmail.com] 
Sent: Monday, March 28, 2011 10:37 AM
To: Steve Friedl
Cc: net-snmp-coders
Subject: Re: unable to run snmpd as non-root user

snmpd quits. as soon as I execute it.


On 3/28/11, Steve Friedl st...@unixwiz.net wrote:
 What does unable mean? What happens when you try?

 -Original Message-
 From: Ravi Kumar [mailto:mynets...@gmail.com]
 Sent: Monday, March 28, 2011 9:22 AM
 To: net-snmp-coders
 Subject: unable to run snmpd as non-root user

 Hi,

 Could any one tell me why the snmpd does not run with sudo as given below.

 $ sudo /home/ravi/net-snmp-5.5/agent/snmpd -c 
 /home/ravi/net-snmp-5.5/local/snmpd.conf,/var/net-snmp/snmpd.conf -C 
 -u ravi

 I am trying to run snmpd as root with sudo command on 161 port and 
 switch back to user ravi using -u option. User ravi is included in 
 /etc/sudoers file.


 Thanks,
 Ravi

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Re: unable to cross compile Internal Crypto Support

[Steve Friedl]

On Thu, Feb 10, 2011 at 09:12:11AM -0800, Wes Hardaker wrote:
  On Thu, 10 Feb 2011 16:56:39 +, Dave Shield 
  d.t.shi...@liverpool.ac.uk said:
 
 DS Wes - is it worth trying to catch SIGQUIT,
 DS and handling this in a similar way to SIGINT.
 
 I don't think you can do that.

It's certainly possible to catch SIGQUIT, but since this is how people generate
a core dump for debugging, it would interfere with somebody trying to get an
agent working (though certainly not the most common case).

Steve


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Re: unable to cross compile Internal Crypto Support

[Steve Friedl]

On Thu, Feb 10, 2011 at 11:12:45AM -0800, Wes Hardaker wrote:
  On Thu, 10 Feb 2011 17:23:41 +, Dave Shield 
  d.t.shi...@liverpool.ac.uk said:
 
 DS Ctrl-\
 DS gives the same output as using Ctrl-C to kill the agent.
 DS (using read_config as a convenient way of tracking
 DS shutdown processing)Without the patch, I get
 
 And what happens when we're stuck in an infinite loop and you hit Ctrl-\ then?
 It won't exit and we'll need to resort to ctrl-z, kill %1 instead.
 
 IMHO, the separation between the two is a good thing.  Making them align
 gives less control to the user for getting out of a mess.

I completely concur w/ Wes here.


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Re: SNMP in Quagga

[Steve Friedl]

On Tue, Nov 23, 2010 at 02:48:13PM +0100, Quagga Snmp wrote:
 Quagga itself does not support SNMP agent (server daemon) functionality but
 is able to connect to a SNMP agent using the SMUX protocol.
 
 I want that quagga support SNMP agent (daemon snmpd) without installing
 other software, I mean, if you install Quagga software in a PC, immediately 
 you
 can send snmpget or snmpwalk to that PC and receive the answer.

This is a bad idea if for no other reason that running Quagga's
built-in SNMP daemon would prevent somebody from running the real
one, perhaps with additional MIBs.

I do understand the nice notion of having things all-in-one, but I believe
it comes at too high a cost in lost modularity.

Doing this via an SMUX plugin is really, really the right way to do this.

Steve (who's done a Quagga SMUX plugin before)

 2010/11/23 Dave Shield d.t.shi...@liverpool.ac.uk
 
  On 23 November 2010 12:09, Quagga Snmp quaggas...@gmail.com wrote:
   I´m working in a project of my university. The tarjet is to insert a snmp
   daemon in Quagga (routing suite).
  
   Is anyone working in this?
 
  I'm no expert on Quagga, but I believe it already has SNMP support
  (running as a SMUX subagent)
 
  See http://www.quagga.net/docs/docs-info.php#SEC143
 
  Dave


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Re: SNMP in Quagga

[Steve Friedl]

On Tue, Nov 23, 2010 at 03:18:03PM +0100, Quagga Snmp wrote:
 But, with SMUX I need a intermediary, or not?

I guess so, depending on what you mean.

It's been a while since I worked on this, but if I recall correctly you'd need
two things:

* Stock snmpd, the same one that ships with the distro (assuming it's been
  compiled with SMUX support - I don't know if that's the default). This is
  installed and configured in the usual way.

* SMUX agent piece that bolts directly onto Quagga.

The config for snmpd identifies the SMUX agent and which part of the OID tree
it serves up, and then standard SNMP queries to the daemon will serve up the
proper answers, either from your SMUX agent or from other parts of the MIB
tree supported by the agent.

Is this not your understanding?

Steve



 For example, I want to ask which is the value of ip_forward in PC(1) from
 PC(2).


 
 Thanks.
 
 2010/11/23 Steve Friedl st...@unixwiz.net
 
  On Tue, Nov 23, 2010 at 02:48:13PM +0100, Quagga Snmp wrote:
   Quagga itself does not support SNMP agent (server daemon) functionality
  but
   is able to connect to a SNMP agent using the SMUX protocol.
  
   I want that quagga support SNMP agent (daemon snmpd) without installing
   other software, I mean, if you install Quagga software in a PC,
  immediately you
   can send snmpget or snmpwalk to that PC and receive the answer.
 
  This is a bad idea if for no other reason that running Quagga's
  built-in SNMP daemon would prevent somebody from running the real
  one, perhaps with additional MIBs.
 
  I do understand the nice notion of having things all-in-one, but I believe
  it comes at too high a cost in lost modularity.
 
  Doing this via an SMUX plugin is really, really the right way to do this.
 
  Steve (who's done a Quagga SMUX plugin before)
 
   2010/11/23 Dave Shield d.t.shi...@liverpool.ac.uk
  
On 23 November 2010 12:09, Quagga Snmp quaggas...@gmail.com wrote:
 I´m working in a project of my university. The tarjet is to insert a
  snmp
 daemon in Quagga (routing suite).

 Is anyone working in this?
   
I'm no expert on Quagga, but I believe it already has SNMP support
(running as a SMUX subagent)
   
See http://www.quagga.net/docs/docs-info.php#SEC143
   
Dave
 
 
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Re: SNMP in Quagga

[Steve Friedl]

On Tue, Nov 23, 2010 at 04:29:31PM +0100, Quagga Snmp wrote:
 In this situation, in PC(1) is necessary to install two things: quagga AND
 stock snmpd. I understand what you say.
 I have to do this project to finish my university studies, if I wanted to do
 this, I ´d use your idea.
 
 Quagga is constructed in modules ( rip daemon, bgp daemon, etc...). In my
 project, I want the snmp daemon into quagga.
 
 I need install only one thing: quagga, and then I can obtein OID variables
 from another PC.
 
 I wish you understand me.

I do understand you: you wish to install only one thing.

And I have wishes too: that I were dating Heidi Klum and that I had as much
money as Bill Gates. But they aren't likely.

Trying to incorporate SNMPD into your own project seems like a really poor
idea even though I see why you would want this.

But I recommend that you take a different approach. You may decide someday
that you really really do have to include snmpd with your project, but you
do not have to make that decision now.

Break the project into two parts.

FIRST: do the SMUX interface with a separate install of SNMPD. You have to do
this anyway in order to provide the functionality, so you may as well
work on the part you cannot avoid.

SECOND: if you really feel like you must package snmpd with quagga, then do
that AFTER you have the SMUX functionality working.

This way you spend your time working on the part you must have, and you might
change your mind on the packaging part later.

Good luck.

Steve

 2010/11/23 Steve Friedl st...@unixwiz.net
 
  On Tue, Nov 23, 2010 at 03:18:03PM +0100, Quagga Snmp wrote:
   But, with SMUX I need a intermediary, or not?
 
  I guess so, depending on what you mean.
 
  It's been a while since I worked on this, but if I recall correctly you'd
  need
  two things:
 
  * Stock snmpd, the same one that ships with the distro (assuming it's been
   compiled with SMUX support - I don't know if that's the default). This is
   installed and configured in the usual way.
 
  * SMUX agent piece that bolts directly onto Quagga.
 
  The config for snmpd identifies the SMUX agent and which part of the OID
  tree
  it serves up, and then standard SNMP queries to the daemon will serve up
  the
  proper answers, either from your SMUX agent or from other parts of the MIB
  tree supported by the agent.
 
  Is this not your understanding?
 
  Steve
 
 
 
   For example, I want to ask which is the value of ip_forward in PC(1)
  from
   PC(2).
 
 
  
   Thanks.
  
   2010/11/23 Steve Friedl st...@unixwiz.net
  
On Tue, Nov 23, 2010 at 02:48:13PM +0100, Quagga Snmp wrote:
 Quagga itself does not support SNMP agent (server daemon)
  functionality
but
 is able to connect to a SNMP agent using the SMUX protocol.

 I want that quagga support SNMP agent (daemon snmpd) without
  installing
 other software, I mean, if you install Quagga software in a PC,
immediately you
 can send snmpget or snmpwalk to that PC and receive the answer.
   
This is a bad idea if for no other reason that running Quagga's
built-in SNMP daemon would prevent somebody from running the real
one, perhaps with additional MIBs.
   
I do understand the nice notion of having things all-in-one, but I
  believe
it comes at too high a cost in lost modularity.
   
Doing this via an SMUX plugin is really, really the right way to do
  this.
   
Steve (who's done a Quagga SMUX plugin before)
   
 2010/11/23 Dave Shield d.t.shi...@liverpool.ac.uk

  On 23 November 2010 12:09, Quagga Snmp quaggas...@gmail.com
  wrote:
   I´m working in a project of my university. The tarjet is to
  insert a
snmp
   daemon in Quagga (routing suite).
  
   Is anyone working in this?
 
  I'm no expert on Quagga, but I believe it already has SNMP support
  (running as a SMUX subagent)
 
  See http://www.quagga.net/docs/docs-info.php#SEC143
 
  Dave
   
   
--
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st...@unixwiz.net | Orange County, CA   | Microsoft MVP |  unixwiz.net
   
 
  
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Re: Strange behavior with SNMP walk.

[Steve Friedl]

On Wed, Sep 01, 2010 at 07:25:21PM +, Yehiel Samson wrote:
 There is a strange behavior with the SNMP walker, if I perform the following 
 command:
 
   snmpwalk -One -v2c -c public  IP 1.3.6.1.4.1.4491.2.1.20.1.23
 
 I receive this answer:
 
 .1.3.6.1.4.1.4491.2.1.20.1.23.1.2.536870914.256 = Hex-STRING: 01 02 03 04
 .1.3.6.1.4.1.4491.2.1.20.1.23.1.2.536870914.16777217 = Hex-STRING: 01 02 03
 .1.3.6.1.4.1.4491.2.1.20.1.23.1.2.536870914.16777218 = Hex-STRING: 01 02 03 04

 But if I perform a full complete SNMP walk
 
   snmpwalk -One -v2c -c public  IP  /tmp/file
 
 These values do not appear in the output file.

The latter is not a complete walk. From the snmpwalk man page:

If no OID argument is present, snmpwalk will search the subtree rooted
at SNMPv2-SMI::mib-2

If you really want a full walk, I normally walk starting at .1 (though there
is probably a better way)

Also, snmpbulkwalk is going to be a lot faster for you; try it like this:

snmpbulkwalk -One -v2c -c public IP .1  /tmp/file

Steve

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Re: Documentation

[Steve Friedl]

On Fri, Aug 13, 2010 at 04:52:19PM +0200, rene.meu...@ing.be wrote:
 
 I have downloaded net-snmp for Solaris.  I would like to find a 
 documentation, programming guide and/or reference guide, about the c api.  
 I'm mainly interested in the way to process incoming snmpv1, snmpv2 and 
 snmpv3 traps.
 Could you help me, please?

There is a host of resources on the http://www.net-snmp.org/ site - have
you checked there first before asking others for help?

Steve

 
 Thanks in advance for your reply.
 
 
 René Meurée
 Contractor
 ING Group/OPSIT Banking/CBS Payments Belgium/System Service Delivery/SM TRS
 P.O. BOX 60,  Cours Saint-Michel , 1040 Etterbeek, Belgium
 Tél:  +32 (0)2 7389216
 mailto: rene.meu...@ing.be
 mailto:  swift.t...@ing.be

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Re: difference between snmpwalk and snmpbulk

[Steve Friedl]

On Fri, Jul 30, 2010 at 07:30:54PM +0530, shardul kumar wrote:
 Hi All,
 
 Could any one please let me know why do we need snmpbulk while
 snmpwalk(using GETNEXT)
 is already available for bulk data transfer. I mean to say if I am able to
 retrieve all the rows of a
 table using GETNEXT then what is so special in GETBULK ?

It's a huge performance win to be able to return more than one OID at a time,
especially when there's some distance between agent and client. Try timing an
snmpbulkwalk of something across a VPN tunnel on the other side of the country,
then do the same thing with snmpwalk.

Steve

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Re: truncating integer value 32 bits

[Steve Friedl]

On Mon, Jun 28, 2010 at 09:01:29PM +0530, Prakash wrote:
 How to handle u_int64_t type variables.
 
 u_int64_t value = 39952034381;
 
 when I tried to set the value, I am getting the following message.
 
 truncating integer value  32 bits

The integral constant 39952034381 is too large to fit into a 32-bit integer,
which is what you intend when you just give a sequence of digits. This is
independent of where the value goes when it's assigned.

If you intend a long-long integral value, then add LL:

 u_int64_t value = 39952034381LL;

But this is actually an *unsigned* long long, so make it:

 u_int64_t value = 39952034381LLU;

Please note: it's helpful when you mention the type of compiler when
asking for compiler help.

Steve

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Re: To fork Net-SNMP over the comments issue? (was: Re: Is it policy to strip comments from the source code that we commit?)

[Steve Friedl]

On Mon, May 24, 2010 at 07:11:02AM +0300, Omer Zak wrote:
 2. Is anyone else in favor of forking the Net-SNMP project over the
 comments issue?

Forking a major project over *comments*?

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Re: Software License

[Steve Friedl]

On Wed, May 05, 2010 at 09:34:22AM -0400, Michael A Wagner wrote:
 Are there any license terms associated with this software? 
 
 If so, please tell me where to find them or send me a copy of the license 
 agreement.

There's a License link on the home page of the project - did you look?

http://www.net-snmp.org/about/license.html


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Re: Bugs discovered by a research group at CWRU

[Steve Friedl]

On Mon, Aug 31, 2009 at 03:59:17PM -0400, Gang Shu wrote:
 Hi Dave,
 Thanks a lot for your kind reply. However, I am still confused about the
 function 'shutdown_notification_log()', since there is no explicitly
 resource release statement in it.
 Could you please give me more details? Thanks!

There is an explicit resource release statement:

exit(0);

I believe the idea is that when it's known that the program is about
to exit soon anyway, there's no concerted effort to release all the
memory because the OS will clean it up soon anyway.

Steve

 
 void shutdown_notification_log(void)
 {
 max_logged = 0;
 check_log_size(0, NULL);
 }
 
 Best,
 Gang
 
 
 -Original Message-
 From: dave.shi...@googlemail.com [mailto:dave.shi...@googlemail.com] On
 Behalf Of Dave Shield
 Sent: Monday, August 31, 2009 2:13 PM
 To: Gang Shu
 Cc: net-snmp-coders@lists.sourceforge.net
 Subject: Re: Bugs discovered by a research group at CWRU
 
 2009/8/31 Gang Shu gxs...@case.edu:
  Could you please tell us where the global variables nlmLogTable
  and table_set have been freed?
 
 This data structure will be freed when the agent shuts down.
 
 I strongly suspect it's not explicitly released - most of the MIB module
 handlers don't bother to clean up fully, since they will typically only
 be unloaded as part of the agent shutting down (when it will release
 all allocated memory anyway).
 
The natural place to handle this resource release would probably be
 in the 'shutdown_notification_log()' routine.
 
 Dave
 
 
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Re: Windows - MSVC 2008, 64-bit and Platform SDK

[Steve Friedl]

On Mon, Apr 27, 2009 at 10:51:45AM -0700, Wes Hardaker wrote:
  On Sun, 26 Apr 2009 21:11:09 -0400, Alex Burger 
  ale...@users.sourceforge.net said:
 
 I'm going to defer all judgment to those more familiar with windows
 development than I.  Thus take these comments as minor:
 
 AB 4) I don't think we need to support Windows NT anymore and we certainly 
 AB don't need to support Windows 9x.
 
 I'm not sure I buy NT being gone.  I suspect it's still in greater use
 than it possibly should be.  But again, I'll defer and am not voting.

Sadly, Windows NT4 is still in use by plenty of systems - I still run into
them in the medical industry attached to CAT scanners and the like - but these
are legacy systems for which development has been frozen for a long time.

Even if vendors are still [barely] supporting the code - as Microsoft does
for a big fee - it stretches the imagination that anybody is undergoing
new development on this platform.

If I were king, I'd be happy to drop NT4 support from the current release
and invite those poor self-abusing souls who need it to use version N-1
on that platform.

Alex wrote:
 For #2, we can either distribute the Microsoft DLLs (1.4Meg) or require
 that the user install the 'Microsoft Visual C++ 2008 Redistributable
 Package' from the Microsoft web site.  It's probably easier to just
 include the DLLs.

I think it makes me a little nervous to take responsibility for distributing
somebody else's binaries when it's not so hard to point them to the right
place. But depending on how the installer is built I guess it might be so
much more convenient for the to just include them.

Steve

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Re: Is it possible to retrieve one ROW of a table only?

[Steve Friedl]

On Wed, Sep 03, 2008 at 12:01:18PM -0700, Need Help wrote:
 I can not figure out which SNMP command will allow me to query one complete 
 row of data from a table only.
 
 For example, assume my table has 10 rows in it with 20 columns for each 
 row..  How can I query row #7 to get all 20 columns of data?

I don't believe there is an obvious way to solve this obvious problem:
you can walk a table easily by column, but not by row. If you know the
index, you can snmpget col1.7 col2.7 col3.7 col4.7 etc. and I think they
can be put in a single request.

You and everybody else wishes it were trivial to do what you're asking.

Steve

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Re: addding new fd in select() for recieving request

[Steve Friedl]

On Mon, Jun 09, 2008 at 11:53:23AM +0530, [EMAIL PROTECTED] wrote:
 I am thinking of doing it in following manner.
 Please comment on the following if it is wrong

It's been a while since I have done this, but I think that the count of FDs
is not being set properly. ** NOTE INLINE

 main()
 {
 fd_set master;
 fd_set read_fds;
 int listener;
 int fdmax;** UNUSED
 int newfd;
 
   FD_ZERO(master); 
   FD_ZERO(read_fds);
 
 listener = socket(AF_INET, SOCK_STREAM, 0);
 bind(listener, (struct sockaddr *)myaddr, sizeof(myaddr));
 listen(listener, 10)
 
   // add the listener to the master set
   FD_SET(listener, master);
 fdmax = listener; ** UNUSED
 
  while()
  {

int numfds = listener+1;** ADD THIS

  read_fds = master;
  snmp_select_info(numfds, read_fds, NULL, 0);
  
  select(numfds,read_fds,0,0,NULL)
  if (FD_ISSET(listener , read_fds)) 
  {
  newfd = accept(listener, (struct sockaddr 
 *)remoteaddr,addrlen)
  //function1 ---reads the data add it to queue and forward 
 to manager as a TRAP
  }
 
  }
 }

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Re: How to integrate NetSNMP into a working Linux environment?

[Steve Friedl]

On Thu, Jun 07, 2007 at 12:32:00PM -0700, Need Help wrote:
 Ok, my company would like me to start discussing how to incorporate NetSNMP 
 into the company's build environment.   I explained the following stuff:

Your company should probably retain a consultant experienced in these
matters, because it's likely to rapidly wander outside the bounds of
of the library itself, and what help you're likely to get here.

Steve


 - Indicated ./configure, make and make install were required for NetSNMP
 - Indicated snmp.conf and snmpd.conf files exist to define stuff
 - Indicated certain environment variables could be used if desired
 - Indicated other stuff as well as much as I came across so far  :P
 
 During this discussion, the build-production people at my company informed 
 me we can not perform the configure command as part of our build process. 
   Instead it would be necessary to understand exactly what the configure 
 command (and I guess the make and make install commands as well) do 
 behind the scenes so our build process and perform these exact steps 
 ourselves.  I was told we do not want to execute a script file with all of 
 the required commands and options in it as well.   
 
 Anyway, is this a common approach to integrating NetSNMP into a business 
 application (ie: not using the standard setup commands/options as part of the 
 command line or in a script file)?  It scares me not to use the standard 
 steps to get NetSNMP configured/running.  Perhaps someone can explain to me 
 whether this is weird or not.  If so, then perhaps you can give me a quick 
 overview as to how NetSNMP should normally be integrated in a build system.
 
 I understand no one knows how our build system works (neither do I), but any 
 input into this topic would be greatly appreciated.
 
 Is it crazy to think we can perform everything that ./configure, make and 
 make install does oursleves without using those commands?  Perhaps we do 
 not need many of the things these commands do to set up NetSNMP?
 
 I obviously had no answers for my company on this issue, so I am asking for 
 help from people who have gone through this before.
 
 
 
 
 
 
  
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Re: Is this a bug? Strange walk behavior

[Steve Friedl]

On Wed, May 23, 2007 at 09:09:17AM +0100, Dave Shield wrote:
 On 23/05/07, Steve Friedl [EMAIL PROTECTED] wrote:
 Let's start by walking the leading part:
 
 $ snmpbulkwalk localhost bgp4PathAttrASPathSegment.64.160
 ?? where is 64.160.0.0 ?
 bgp4PathAttrASPathSegment. 64.160.71.0  .24. 10.1.1.4 = (data)
 
 First thing - I'd suggest you test this using snmpgetnext rather that
 snmpwalk.

Yah, getnext has the same behavior.

 Secondly - yes this looks like a bug.
 The next step is to locate exactly where this problem arises.
 
 Try restarting the master agent using the '-d' flag, and running the
 same snmpgetnext command.
   What do the packet dumps look like?

Well the packet dumps only show the SNMP stuff; I don't see any activity
about smux, so I ran tcpdump.

$ snmpgetnext -Os localhost bgp4PathAttrASPathSegment.64.160.0
bgp4PathAttrASPathSegment. 64.160.71.0 .24. 204.11.217.34 = Hex-STRING: 
02 03 0D 1C 04 D7 35 B7 

So that's the wrong one. (s/b 64.170.0.0 .12.).

Digging in, these are the -d packet dumps, and I doubt that these are going to
provide anything interesting:

SNMPD -d DUMPS
--

Received 49 bytes from UDP: [127.0.0.1]:8372
: 30 2F 02 01  01 04 07 XX  XX XX XX XX  XX XX A1 210/.xxx.!
0016: 02 04 4E 43  DD 51 02 01  00 02 01 00  30 13 30 11..NC.Q..0.0.
0032: 06 0D 2B 06  01 02 01 0F  06 01 05 40  81 20 00 05[EMAIL PROTECTED] ..
0048: 00.

Connection from UDP: [127.0.0.1]:8372
Received SNMP packet(s) from UDP: [127.0.0.1]:8372
  GETNEXT message
-- BGP4-MIB::bgp4PathAttrASPathSegment.64.160.0

Sending 65 bytes to UDP: [127.0.0.1]:8372
: 30 3F 02 01  01 04 07 XX  XX XX XX XX  XX XX A2 310?.xxx.1
0016: 02 04 4E 43  DD 51 02 01  00 02 01 00  30 23 30 21..NC.Q..0#0!
0032: 06 15 2B 06  01 02 01 0F  06 01 05 40  81 20 47 00[EMAIL PROTECTED] G.
0048: 18 81 4C 0B  81 59 22 04  08 02 03 0D  1C 04 D7 35..L..Y5
0064: B7.


Looking at the SMUX stuff might be more productive, though it looks kinda
ugly without protocol decoders. I think I'm going to have an easier time
of this by digging into the bgpd (formerly zebra) daemon code itself and
adding some debug.

06:36:15.048194 localhost.smux  localhost.9814: P [tcp sum ok] 7:45(38) ack 47 
win 32768 nop,nop,timestamp 245487376 245486622 (DF) (ttl 64, id 11976, len 
90)
0x   4500 005a 2ec8 4000 4006 0dd4 7f00 0001[EMAIL 
PROTECTED]@...
0x0010   7f00 0001 00c7 2656 f53a f04c 2abe 41b0..V.:.L*.A.
0x0020   8018 8000 5a3e  0101 080a 0ea1 d710Z..
0x0030   0ea1 d41e a182 0022 0201 0102 0100 0201...
0x0040   0030 8200 1530 8200 1106 0d2b 0601 0201.0...0.+
0x0050   0f06 0105 4081 2000 0500   [EMAIL PROTECTED]
06:36:15.048335 localhost.9814  localhost.smux: P [tcp sum ok] 47:101(54) ack 
45 win 32768 nop,nop,timestamp 245487376 245487376 (DF) (ttl 64, id 11977, 
len 106)
0x   4500 006a 2ec9 4000 4006 0dc3 7f00 0001[EMAIL 
PROTECTED]@...
0x0010   7f00 0001 2656 00c7 2abe 41b0 f53a f072V..*.A..:.r
0x0020   8018 8000 ff01  0101 080a 0ea1 d710
0x0030   0ea1 d710 a282 0032 0201 0102 0100 0201...2
0x0040   0030 8200 2530 8200 2106 152b 0601 0201.0..%0..!..+
0x0050   0f06 0105 4081 2047 0018 814c 0b81 5922[EMAIL PROTECTED]
0x0060   0408 0203 0d1c 04d7 35b7   5.
06:36:15.143999 localhost.smux  localhost.9814: . [tcp sum ok] 45:45(0) ack 
101 win 32768 nop,nop,timestamp 245487386 245487376 (DF) (ttl 64, id 11981, 
len 52)
0x   4500 0034 2ecd 4000 4006 0df5 7f00 0001[EMAIL 
PROTECTED]@...
0x0010   7f00 0001 00c7 2656 f53a f072 2abe 41e6..V.:.r*.A.
0x0020   8010 8000 b3dd  0101 080a 0ea1 d71a
0x0030   0ea1 d710  

Thanks for the help.

Steve

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Is this a bug? Strange walk behavior

[Steve Friedl]

Hello all,

I'm sure this is not a bug in net-snmp per se, but perhaps it's a bug
in an application with an SMUX add-in. My only goal here is to find out
if this is actually a bug or not (I think it is). If so, I'll dig inside
the application to address it.

The BGP4 MIB provides for, among other things, access to a router's BGP
routing table, and this is useful for network management purposes.

This is a snippet of a table, in order, and thne parts after the leading
bgp4PathAttrASPathSegment are a network number, the CIDR /## nbits,
and the IP address of a router. I've added a bit of spacing to make it
easier to read. We never care about the router part, but the Network
and /## both are:

   Network  /##  Router
..  --- -
bgp4PathAttrASPathSegment. 64.158.223.0 .24. 10.1.1.5 = (data)
bgp4PathAttrASPathSegment. 64.159.64.0  .19. 10.1.1.5 = (data)
bgp4PathAttrASPathSegment. 64.160.0.0   .12. 10.1.1.4 = (data) 
bgp4PathAttrASPathSegment. 64.160.71.0  .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.100.0 .23. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.143.0 .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.151.0 .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.254.0 .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.161.79.0  .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.161.99.0  .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.161.255.0 .24. 10.1.1.5 = (data)

This part is all in order. The line marked  is the interesting one,
and the entry I seem to have a hard time locating.

I have always believed that when doing a table walk, providing an OID
gets you the first OID *after* the one provided, but I don't know that
this is doing the right thing.

Let's start by walking the leading part:

$ snmpbulkwalk localhost bgp4PathAttrASPathSegment.64.160
?? where is 64.160.0.0 ?
bgp4PathAttrASPathSegment. 64.160.71.0  .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.100.0 .23. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.143.0 .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.151.0 .24. 10.1.1.4 = (data)
bgp4PathAttrASPathSegment. 64.160.254.0 .24. 10.1.1.4 = (data)

It looks like it entirely skips the first entry even though it appears to be
the next one purportedly in line. It seems that I have to fill out zeros of
the IP address *and* fill in the /nbits to get it:

$ snmpbulkwalk localhost bgp4PathAttrASPathSegment.64.160.0
bgp4PathAttrASPathSegment.64.160.0 = No Such Instance currently exists at this 
OID

$ snmpbulkwalk localhost bgp4PathAttrASPathSegment.64.160.0.0
bgp4PathAttrASPathSegment.64.160.0.0 = No Such Instance currently exists at 
this OID

$ snmpbulkwalk localhost bgp4PathAttrASPathSegment.64.160.0.0.0
bgp4PathAttrASPathSegment.64.160.0.0.0 = No Such Instance currently exists at 
this OID

$ snmpbulkwalk localhost bgp4PathAttrASPathSegment.64.160.0.0.12
bgp4PathAttrASPathSegment.64.160.0.0 .12. 10.1.1.4 = (data)

I think that all of these should return at least the first line, maybe more.

I am seeing this behavior in the Quagga BGP daemon, which plugs in as an SMUX
extension to net-snmp. When I make the same queries against the real Juniper
routers, I get the behavior I expect.

Is this a bug? Or is an implementation allowed to do things like this if it
makes internal implementation easier (as this almost certainly does).

Thanks,
Steve

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Re: Problems building 5.4 on Linux

[Steve Friedl]

On Tue, Mar 27, 2007 at 04:13:26PM +0200, Eirik Nordbr wrote:
 The library libelf seems to be installed:

 $ ls -l /usr/lib/libelf*
 -rwxr-xr-x  1 root root 65492 Aug 13  2006 /usr/lib/libelf-0.97.1.so
 lrwxrwxrwx  1 root root16 Feb 21 09:13 /usr/lib/libelf.so.1 - 
 libelf-0.97.1.so

That's the shared object used at runtime (provided by the
elfutils-libelf package), but not the libelf.a library required to
compile against it. Look for a something like a elfutils-libelf-devel
package to provide this.

Steve

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Re: scope reductions

[Steve Friedl]

On Sun, Mar 04, 2007 at 06:07:08PM +0100, Magnus Fromreide wrote:
 On sön, 2007-03-04 at 13:55 +0100, Thomas Anders wrote:
  Magnus Fromreide wrote:
   Are patches like the attached ones of interest for the project or should
   I just ignore such things when I see them?
  
  Cleanup is always appreciated.
  
   The advantage of the patches is that they make the code more local so
   you do not have to keep track of lots of function scope variables, see
   for instance make-zone-local where there are two uses of the variable,
   25 and 50 lines from the declaration or make-len-local where the use is
   90 lines from the declaration.
   
   make-len-local
   Move the len variable from function scope to the scope of the if
   clause where it i used.
   
   make-zone-local
   Move the zone variable from function scopes of the two if
   clauses  where it is used.
  
  Don't these two patches introduce potential problems with C89 compilers?
 
 No.
 
 In both cases the declarations is at the start of a block, and as far as
 I know it have always been valid to declare variables at the start of a
 block, even if it is an inner block.

Steve the language lawyer concurs, with hearty applause: scope reductions
make code easier to understand and maintain.

Steve :-)


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Re: net-snmp-5.4 bug report

[Steve Friedl]

On Sun, Feb 25, 2007 at 11:36:34PM +0800, Moore Michael wrote:
 Hi there 
 
 I use net-snmp-5.4, and there's  a NULL pointer operator in  
 snmplib/snmp_api.c
 
 void   *  
 snmp_sess_pointer(netsnmp_session * session)
 {
struct session_list *slp;
 
snmp_res_lock(MT_LIBRARY_ID, MT_LIB_SESSION);
for (slp = Sessions; slp!=NULL; slp = slp-next) {
if (slp-session == session) {
 
 /*  ^---  here  for the  loop end, slp=NULL 
 then slp-session illegal, or  change the for loop to while loop;  such as 
 while(slp!=NULL) { xxx; slp=slp-next; }  */
 
break;
}
}

This code is perfectly valid:

for (slp = Sessions; slp; slp = slp-next) {
if (slp-session == session) {
break;
}
}

is the same as

slp = Sessions; /* initialization part */

while ( slp != NULL )   /* test part */
{
if ( slp-session == session )
break;

slp = slp-next;/* increment part */
}

In particular, the increment is not done until after the slp!=NULL test has been
performed.

Steve

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Re: CVS MAIN+5.4.x broken

[Steve Friedl]

On Thu, Feb 22, 2007 at 11:37:23AM -0800, Wes Hardaker wrote:
 soapbox
 AR.  Can I pay $1Mil to all our customers to let us reimplement
 configure in perl instead of a billion incompatible minor shell
 scripting languages.
 /soapbox

I'd like to be the first to sign up for that $1M beta test ;-)

Steve

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Re: Mixing sync and async calls?

[Steve Friedl]

On Wed, Feb 14, 2007 at 01:17:05PM -0800, [EMAIL PROTECTED] wrote:
 I'm writing a program that, in essence, polls a number of devices 
 simultaneously.  They're slow to respond individually, and I have a lot to 
 go through - doing them sequentially would take forever.  I set up a 
 callback function and send my requests off via snmp_send(), use snmp_wait() 
 and everything is happy. 
 
 However, in one case, while processing the async response in my callback 
 function, I need to fetch a different piece of information before I can 
 finish with processing.  I make an entire new SNMP session, and send it off 
 to snmp_synch_response. 
 
 Unfortuantely, snmp_synch_response never returns - it looks like it sends 
 the request off and uses snmp_wait(), but that unfortuantely just goes back 
 to processing the async responses.  This eventually just blows over the 
 stack (hitting bt in gdb and getting 500+ stack frames is not a pleasant 
 experience). 
 
 Right now, I'm looking at having to just call the command-line snmpget to do 
 what I want (it would be rather difficult to get this fed back into the 
 async processing) - is that the only solution to this?  Is there a way to 
 get NET-SNMP to ignore the async requests while its supposed to be 
 processing the single sync request? 

The proper way to handle this is to have an object per device, and work
with a *list* of things you need to poll. You'll kick the process for
one request by transacting the first OID, and during the callback process
mark that one as finished.

Then, in the main loop having finished the first OID, you'll kick off the
second.

Steve

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Re: question on timeticks and long into char stuffing

[Steve Friedl]

On Wed, Jan 17, 2007 at 12:01:19AM +0100, Alef Veld wrote:
 Thanks Wes.
 I figured out the 1 part. I'm not sure what you mean exactly by  
 number 2 though. Do you mean
 that the long is defined 32bits on my machine ? If so, are you  
 implying i need an even bigger number to host the long * ? I just  
 need a proper way to stuff the long * dereferenced value into
 my char * pointer. I'm probably just missing something though that  
 will pop op one of these days :-)

The largest 32-bit integer is 4294967296, and this forms:

4294967296 ticks @ 100th of a sec
  42949672 seconds
715827 minutes
 11930 hours
   497 days

If the device is up for more than 497 days, it wraps around to zero, and
you can't really tell directly whether it was a reboot or a counter wrap
(though it's probably possible to intuit this via other means, such as
noting that the interface counters didn't reset).

But if it's a Windows, machine, this won't ever come up ;-)

Steve

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  AV == Alef Veld [EMAIL PROTECTED] writes:
 
  AV The other question i have is, how do i calculate the uptime in  
  days,
  AV because all i have is the number of timeticks. Or can you actually
  AV read out the days. I don't think so, so there must be some  
  algorithm
  AV for that.
 
  2 points:
 
  1) sysuptime is in 1/100s of a second.  So you can calculate the
 number of days by sysUpTime/100/60/60/24.
 
  2) it is defined as a 32 bit integer.  Thus it does wrap after that
 and you can't determine if it's been up longer than the wrap time.
  -- 
  Wes Hardaker
  Sparta, Inc.
 
 
 
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Re: SNMP Agent over HP printer

[Steve Friedl]

On Tue, Dec 19, 2006 at 10:38:39PM -0800, K.M. wrote:
 The Host Resources MIB [RFC1514] provides two status objects that can be used 
 to describe the status of a printer: hrDeviceStatus and hrPrinterStatus.
   What you need is to implement this MIB in the printer. My question is How  
 to implement this over HP printer. it is done in Ricoh 4500 and 4510,
 OKI C9500 and XEROX Phaser 860 printers and i am looking to implement it in HP
   …. I think it is clear now Mr.Shield . !!

I think you won't get this easily.

The DeskJet 5550 is a discontinued low-end desktop printer with nearly
no local intelligence: it doesn't run SNMP or TCP/IP (it's a parallel
or USB printer) so there is simply no place to do anything with SNMP
on this printer. Almost everything is done in the driver.

The only way to monitor the printer is with whatever tools HP gives you.

Now: if you are some kind of OEM who wishes to resell this printer
to your customers for some niche market (as I've done for a customer
with a Kodak printer meant for the medical market), you can invest a
very large amount of resources reverse engineering how it all works,
but this is a very long and hard road that is probably well beyond your
best efforts.

Steve

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Re: rfv: MSVC Workspace build fixes

[Steve Friedl]

On Sat, Nov 18, 2006 at 03:01:42PM -0500, Alex Burger wrote:
 *This patch only affects building with the MSVC Workspace*.

I haven't tried it myself - I do all my Windows builds on the command line
(menus are for wimps) - but have looked at all of this and find that it
does just what he says it does, will obviously not affect other platforms
(which minimizes the risk of surprise dorkage), and it includes some
pretty comprehensive doco changes.

If I were building on Win32, I'd want these changes and would really
appreciate the thoughtful information on building the DLLs on the various
versions (even though MSVC 6 is obsolete, it's still very widely used -
good man for covering it).

I give this a +1

Steve

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Re: Adjustment of snmpset.c

[Steve Friedl]

On Sat, Nov 18, 2006 at 06:12:17PM +0100, =?ISO-8859-2?q?Roman =A9ustek?= wrote:
 do anybody know source code of snmpset?
 
 http://www.opensource.apple.com/darwinsource/10.2/net_snmp-7/net-snmp/apps/snmpset.c
 
 I need to adjust it in the way that the main function would copy the 
 parameters from the memory and no from command line. From structure, what 
 would be exactly the same as a argv structure. So I changed name of main 
 function to for example int set (int argc, char *argv[]) /this parametres are 
 local, that\'s means that they aren\'t the same sturcture as argv form 
 command line/.then created such structure as argv
 
 int myargc = 9;
 
 char *myarvg [9];
 
 myargv [0] = \.\;
 ..
 ..
 myargv [8];
 
 and called
 
 set (myargc, myargv);
 
 but the result was Segmentation Fauld.
 
 
 Could anybody help me figure out where is the problem ? Thanks 

There are several issues here, one of which is an outright bug, but this is
a poor way to solve this problem in any case. The better way to do this is
from a shell script, not modifying the source.

But let's say that you are determined to do it this way, it's much wiser
to let the compiler do the counting for you:

char*myargv[100];   // room for plenty
char**pargv = myargv;   // starts at the front

*pargv++ = program name;
*pargv++ = arg1;
*pargv++ = ...
*pargv++ = last arg here;
*pargv   = 0;   // you MUST include NULL termination

/* argcargv */
set( (int)(pargv - myargv), myargv);

Note #1: there's no way to get the count wrong, because pargv maintains
it for you. Just imagine using fixed indexes with either #ifdef code, or
runtime if/else code - it would be a nightmare. Pointers are your friend.

Note #2: I think your bug is failing to include a final NULL parameter in
the argument list. This is part of the spec, and it's common for this to
be *relied* on by consumers of argc/argv,  BUT: the NULL is not included
in the count.

Note #3: string constants are really /const/, but pointed-to argv members
are supposed to be writable. It's bad form to mix them, it *will* fault
on some platforms if the strings are actually modified, so you really should
use writable strings. The ugly way:

char*myargv[100];   // room for plenty
char**pargv = myargv;   // starts at the front

*pargv++ = strdup(program name);
*pargv++ = strdup(arg1);
*pargv++ = ...
*pargv++ = strdup(last arg here);
*pargv   = 0;

It's cheating and ugly, but then so is modifying snmpset in this way, so it
probably would work fine.

Good luck,
Steve

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Re: synchronous versus asynchronous

[Steve Friedl]

On Tue, Nov 14, 2006 at 07:10:38PM +0100, Alef Veld wrote:
 If i wanted to discover a large amount of hosts, which method would  
 be better. How does asynchronous work? Does it just send a bunch of  
 udp packets in a threaded fashion?
 
 Another thing; as i start my foray in this snmp world :-), there seem  
 to be _almost_ no librarys who deal directly with snmp. Almost all  
 apps use a library like ucd or net-snmp. Why is this ? Although i'd  
 rather code my own snmp client software i recognize the work and  
 options that have been put into net-snmp so i will probably decide  
 not to invent the wheel again.
 
 It's just that i find the net-snmp library pretty difficult to  
 understand, and i wonder if there are some bare bones snmp client  
 whose only hook is the systems headers/libraries.

The clear winner here is async: you can poll hundreds of hosts from
a modest machine with a single thread. This is because the great bulk
of the time spent by your program is *waiting for I/O*, and when it
works synchronously, this time is serialized.

You can ameliorate this somewhat by using multiple threads, but that
still serializes within a single thread. Threading introduces its own
complexity - especially since I don't think that NET-SNMP is fully
threadsafe - and this doesn't scale to hundreds of hosts.

I've seen single-threaded sync applications that have a very hard time
polling 100 hosts in 5 minutes, especially if one of them is down -
those retries and timeouts are all fully serialized, and your app is
doing nothing most of the time.

With async, I/O waits are 100% parallized, so you max out either on
your network bandwidth, or your CPU, but not on wall-clock time.

The core of your application will be an event loop. You'll have some
concept of a work-to-do list (hosts with lists of OIDs to request).
In each loop, you send as many requests as you can (up to some
reasonable limit), and the library keeps track of which ones are
waiting for a response.

Then you crank the I/O with a select() call, and hand the results to
the SNMP library. It runs through the list of file descriptors which
have fired, reads the responses, and matches them up with the requests
it's kept track of.

When it matches this response up, it fires your callback to process it,
and you'll take the response PDU, decode it, and store the data somewhere.
Then you tell the library that this request has been satisfied, and it
frees up one slot for another request you'll submit at the next loop.

Timeouts are handled as well, with the same callback mechanisms.

Make no mistake: async processing is much, much more complicated, and
even those who have been writing communications controllers for 20 years
*cough* me *cough* have some slow slogging.

But async is a slam-dunk win for performance.

Some time ago I wrote an async *DNS* resolver to crank through Apache
log files (doing IP to name resolutions), and it was able to do on the
order of 100 resolutions per second on an old slow machine.

fastzolver - Very fast Asynchronous DNS resolver for Webalizer
http://www.unixwiz.net/tools/fastzolver.html

In fact, most async apps require a way to pace themselves so they don't
blow out the infrastructure.

Steve (async kind of guy)

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Re: synchronous versus asynchronous

[Steve Friedl]

On Tue, Nov 14, 2006 at 09:11:48PM +0100, Alef Veld wrote:
 So basically if i understand correctly async is using select with  
 nonblocking sockets and a large set of file descriptors? I assume you  
 use that since you stated that net-snmp is not thread-safe. And in  
 addition you just send a whole bunch of udp sendto's in a event loop?
 
 that's really something i would like to have. basically i want to  
 write a function that does async snmp and in that same function it  
 calculates the netblock it needs to snmp to by supplying a net/prefix  
 as argument.
 
 However, i feel really stupid when looking at the net-snmp library or  
 even example code. It seems bloody complicated :-). I'm now using a  
 modified version of the sync demo app to use with snmpv1 (Seems to  
 work for snmpv2 to?) but as stated before, it sucks up cpu bigtime if  
 it finds a host who it cannot connect to.

Bloody complicated hits the nail on the head, though it's not impossible
to understand. My recommendation is to do it in perl first, because it's
way easier to cobble something together that way. The perl bindings are
*excellent*.

It takes a while to really get a handle on how to use it well, and I've
been working on a generic async polling engine that does all the hard
stuff: give it a work list and tell it to go. I'm doing one of these in
C now, but I'd never have gotten the factoring right had I not started
in perl first.

Sadly, there isn't any really good prototype code out there for it,
though I may see if I can put some together. My code is part of a
larger infrastructure that won't be so easy to just pull out.

But perl's really the place to start if you can.

Steve

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Re: RFV: Enable fix library DLL support for Windows

[Steve Friedl]

On Thu, Oct 26, 2006 at 08:11:42AM -0400, Alex Burger wrote:
 I would like to enable DLL support for the applications including snmpd 
 and snmptrapd.  We currently only support using the library DLL when 
 building the Perl module.
 
 After some research and testing, it appears that the applications work 
 fine with the library DLL and there doesn't seem to be any issues with 
 data corruption like we originally thought there would be.
 
 For the applications to work, all extern declared variables in the 
 library that are used by the applications must be changed to 
 NETSNMP_IMPORT.  Most were changed already in the past but some were missed.
 
 These changes will also fix the problem with SNMP v3 encryption in the 
 Perl module reported recently (SNMPv3 - problem with auth/encr sessions 
 with Perl module).
 
 The attached patch fixes the externs, and allows for building with the 
 DLL in the MSVC command line build system.
 
 This should not affect non-Windows in any way, and will only affect 
 Windows by allowing the user to build with the DLL without having to 
 modify the build files by hand.  It will also fix the SNMP v3 issue with 
 Perl.

I've been running Alex's patches (to pre4, at least) on my Win32 box,
and snmpd.exe and the snmp{bulk}walk.exe are working just fine (not exactly
a comprehensive test). I have run them all under the HeapAgent memory
debugger as well without any leaks or other problems.

I don't know how the do not use the DLL directive came to pass, but
I have been shipping netsnmp_dll.dll with a project using net-snmp-5.1
without any problems.

But maybe a few thoughts on the patches:

 ++ net-snmp-5.4.pre4.dll/win32/libsnmp_dll/libsnmp.def 

Isn't this built from libsnmp.def.in ?

 +++ net-snmp-5.4.pre4.dll/win32/snmptrapd/Makefile.in Wed Oct 25 08:22:38 2006
 @@ -8,7 +8,7 @@
  # Set to 1 to allow the building using the DLL version of SNMPLIB.  This is
  # NOT supported as this program is NOT thread safe and it WILL cause
  # problems!
 -ALLOW_DLL=0
 +ALLOW_DLL=1

(various Makefile.in)

Shouldn't the NOT supported comment be removed, or at least amended?

Otherwise, I would like to have DLL support - it sure makes the
deliverables smaller.

Steve

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 diff -ur net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpTCPDomain.h 
 net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpTCPDomain.h
 --- net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpTCPDomain.h  Thu Sep 
 14 20:48:48 2006
 +++ net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpTCPDomain.hWed Oct 
 25 09:59:20 2006
 @@ -23,7 +23,7 @@
   */
  
  #define TRANSPORT_DOMAIN_TCP_IP  1,3,6,1,2,1,100,1,5
 -extern oid netsnmp_snmpTCPDomain[];
 +NETSNMP_IMPORT oid netsnmp_snmpTCPDomain[];
  
  netsnmp_transport *netsnmp_tcp_transport(struct sockaddr_in *addr, int 
 local);
  
 diff -ur net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpTCPIPv6Domain.h 
 net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpTCPIPv6Domain.h
 --- net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpTCPIPv6Domain.h  
 Thu Jan 29 09:13:58 2004
 +++ net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpTCPIPv6Domain.h
 Wed Oct 25 09:59:44 2006
 @@ -14,7 +14,7 @@
   */
  
  #define TRANSPORT_DOMAIN_TCP_IPV61,3,6,1,2,1,100,1,6
 -extern oid  netsnmp_TCPIPv6Domain[];
 +NETSNMP_IMPORT oid  netsnmp_TCPIPv6Domain[];
  
  netsnmp_transport *netsnmp_tcp6_transport(struct sockaddr_in6 *addr, 
 int local);
 diff -ur net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpUDPIPv6Domain.h 
 net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpUDPIPv6Domain.h
 --- net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpUDPIPv6Domain.h  
 Fri Jul 30 16:01:24 2004
 +++ net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpUDPIPv6Domain.h
 Wed Oct 25 09:59:58 2006
 @@ -14,7 +14,7 @@
   */
  
  #define TRANSPORT_DOMAIN_UDP_IPV61,3,6,1,2,1,100,1,2
 -extern oid  netsnmp_UDPIPv6Domain[];
 +NETSNMP_IMPORT oid  netsnmp_UDPIPv6Domain[];
  
  netsnmp_transport *snmp_udp6_transport(struct sockaddr_in6 *addr,
 int local);
 diff -ur net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpUnixDomain.h 
 net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpUnixDomain.h
 --- net-snmp-5.4.pre4.fresh/include/net-snmp/library/snmpUnixDomain.h Thu Sep 
 14 20:48:48 2006
 +++ net-snmp-5.4.pre4.dll/include/net-snmp/library/snmpUnixDomain.h   Wed Oct 
 25 10:00:44 2006
 @@ -23,7 +23,7 @@
   */
  
  #define TRANSPORT_DOMAIN_LOCAL   1,3,6,1,2,1,100,1,13
 -extern oid netsnmp_UnixDomain[];
 +NETSNMP_IMPORT oid netsnmp_UnixDomain[];
  
  netsnmp_transport *netsnmp_unix_transport(struct sockaddr_un *addr,
int local);
 diff -ur 

Re: pass-through persist and daemon re-configuration with HUP signal

[Steve Friedl]

On Wed, Oct 25, 2006 at 11:27:19AM -0400, Robert Story wrote:
 You should be getting a SIGPIPE when you select on stdin, since it has been
 closed.

No: SIGPIPE is generated when *writing* to a pipe with no readers on
the other end. *Reading* (or selecting) from a closed pipe just gets
a normal EOF.

Steve

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Re: why do we install all system headers?

[Steve Friedl]

On Thu, Aug 17, 2006 at 01:32:36AM +0200, Thomas Anders wrote:
 is there a good reason why make install currently installs all of
 include/net-snmp/system/*.h and not just the one(s) for the system in 
 question?
 Even cross-compiling only has a *single* target system, so why? Is it only to
 save us from having to figure out which one we need (since for some systems 
 they
 are nested)?

I have less experience porting Net-SNMP than the rest of you, but it
strikes me as highly counterproductive to spend any time on this kind
of optimization.

Organizing the *system-provided* header files for a build is a hard
problem (FreeBSD has been awful), but one must put in the time anyway:
there is no magic shortcut that Just Makes It Work.

Organizing the *library-provided* header files does indeed have a
magic shortcut that Just Makes It Work: ship them all.

The upside:

- include/net-snmp/system/ has a few less files

The downside:

- no saving on the tarball size (need to ship them anyway)
- much more complicated ./configure configuration
- ongoing maintenance nightmare and source of bug reports

Steve

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Re: net-snmp error using MS VC++

[Steve Friedl]

On Mon, Mar 13, 2006 at 03:04:03PM -, Ian Dineen wrote:
 hi all, i'm getting the following errors when compiling sample code in 
 Microsoft Visual Studio 6 C++, ive compiled the net-snmp libraries, and i am 
 able to use the supplied executables (eg. snmpget.exe) from the command line 
 with no problems.
 I've changed the setting of VC++ as according the the readme.win32 file but 
 with no success.
 here is the errors which i get when compiling the sample code for a snmpget 
 request.
  
 .obj : error LNK2001: unresolved external symbol _winsock_cleanup
 .obj : error LNK2001: unresolved external symbol _snmp_close
 .obj : error LNK2001: unresolved external symbol _snmp_free_pdu
 .obj : error LNK2001: unresolved external symbol _snmp_errstring
 .obj : error LNK2001: unresolved external symbol _print_variable
 .obj : error LNK2001: unresolved external symbol _snmp_synch_response
 .obj : error LNK2001: unresolved external symbol _snmp_add_null_var
 .obj : error LNK2001: unresolved external symbol _read_objid
 .obj : error LNK2001: unresolved external symbol _snmp_pdu_create
 .obj : error LNK2001: unresolved external symbol _snmp_log
 .obj : error LNK2001: unresolved external symbol _snmp_perror
 .obj : error LNK2001: unresolved external symbol _snmp_open
 .obj : error LNK2001: unresolved external symbol _winsock_startup
 .obj : error LNK2001: unresolved external symbol _snmp_sess_init
 .obj : error LNK2001: unresolved external symbol _init_snmp

Either you're not linking with the SNMP libraries, or you build the libraries
with a different calling convention (__stdcall) than you built the main code
(using __cdecl).

Steve

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Re: NETSNMP_DS_LIB_DONT_PERSIST_STATE?

[Steve Friedl]

On Tue, Jun 28, 2005 at 05:43:19PM +0200, Thomas Anders wrote:
 Steve Friedl wrote:
 On Fri, Jun 24, 2005 at 04:06:18PM +0200, Thomas Anders wrote:
 Agreed. Steve, are you willing to incorporate this into your upcoming 
 patch?
 
 Sure. But you get to pick the name this time :-)
 
 Now that names have been proposed (by Wes): are you willing to propose a 
 patch?

Yes, within a week or two. 

Steve

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Re: NETSNMP_DS_LIB_DONT_PERSIST_STATE?

[Steve Friedl]

On Thu, Jun 23, 2005 at 04:08:46PM +0200, Thomas Anders wrote:
 -Coders,
 
 what *exact* impact is
 
   netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
  NETSNMP_DS_LIB_DONT_PERSIST_STATE, 1);
 
 supposed to have? The comment in snmplib/default_store.c indicates 
 don't save/load any persistant state, but in fact 
 snmplib/read_config.c::read_config_files() seems to return immediately 
 without reading *any* (even regular) config file in this case.
 
 I must be missing something obvious. Please enlighten me.

This was my patch from early last year:

http://sourceforge.net/tracker/index.php?func=detailaid=849159group_id=12694atid=312694

All of my code that uses NET-SNMP simply does not care about any config
files: it makes a few queries to a particular kind of device, and there
is nothing that all the config stuff could be useful for. This allows
elision of all config/state loads and saves.

I can certainly see how the the name suggests that only the save is
suppressed, so I probably ought to submit a second patch that adds some
more documentation to this.

It was obvious to *me* :-)

Steve

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Re: winservice _snprintf changes

[Steve Friedl]

On Wed, Sep 29, 2004 at 08:30:42PM -0400, [EMAIL PROTECTED] wrote:
   snprintf(OBJECT, sizeof(OBJECT-1), ...

No, 
snprintf(OBJECT, sizeof OBJECT, ...)

works fine: the count includes the NUL byte.

Steve

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Re: anybody using net-snmp on FreeBSD/AMD64 ( or other 64bit platforms??)

[Steve Friedl]

On Thu, Jun 24, 2004 at 10:57:59AM -0400, [EMAIL PROTECTED] wrote:
  3. The agent/mibgroup/mibII/ip.c, function int ip_handler, line 892
 return NULL is bad, as you've noticed.
 the value (int) NULL is assumed to be 0, [not universally true!]

When one wants a portable value for NULL, one should just use the
integral constant 0; this is correct in every case;

return 0;   /* NULL */

Guaranteed to generate the proper bits on any platform.


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