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I don't think adding a custom field to an SNMPv2 trap is possible, but I could be wrong as I'm not an expert in SNMP.</div>
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I didn't find anything either in the net-snmp library or in the RFCs of SNMPv2.</div>
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Your option as far as I see is to send the agent-addr in the varbindlist, as SNMPv1 is not sufficient and it is not supported either in syslog-ng.</div>
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Nevertheless, I don't know your use case, maybe we can find out a different workaround.</div>
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Regards,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
Gabor</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Maurya, Shivani <shivani.maurya@intel.com><br>
<b>Sent:</b> Wednesday, March 23, 2022 7:38<br>
<b>To:</b> Gabor Nagy (gnagy) <Gabor.Nagy@oneidentity.com><br>
<b>Cc:</b> wernli@in2p3.fr <wernli@in2p3.fr>; Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu><br>
<b>Subject:</b> RE: [syslog-ng] Customizing syslog-ng snmp() destination option</font>
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<p class="x_MsoNormal"><span style="">Hi Gabor,</span></p>
<p class="x_MsoNormal"><span style=""> </span></p>
<p class="x_MsoNormal"><span style="">Can you please help here?</span></p>
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<p class="x_MsoNormal"><span lang="EN-US"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US">Regards,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">Shivani Maurya</span></p>
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<p class="x_MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Maurya, Shivani
<br>
<b>Sent:</b> Tuesday, March 22, 2022 10:27 PM<br>
<b>To:</b> Gabor Nagy (gnagy) <Gabor.Nagy@oneidentity.com>; wernli@in2p3.fr; Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu><br>
<b>Subject:</b> RE: [syslog-ng] Customizing syslog-ng snmp() destination option</span></p>
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<p class="x_MsoNormal"><span style="">Hi Gabor,</span></p>
<p class="x_MsoNormal"><span style=""> </span></p>
<p class="x_MsoNormal"><span style="">We want to use snmpv2v/snmpv3 only going forward. This is the reason I want to add the field “agent-addr”. Is there a way to add “agent-addr” field with snmpv2c/snmpv3 ?</span></p>
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<p class="x_MsoNormal"><span lang="EN-US"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US">Regards,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">Shivani Maurya</span></p>
</div>
<p class="x_MsoNormal"><span style=""> </span></p>
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<p class="x_MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Gabor Nagy (gnagy) <<a href="mailto:Gabor.Nagy@oneidentity.com">Gabor.Nagy@oneidentity.com</a>>
<br>
<b>Sent:</b> Tuesday, March 22, 2022 8:48 PM<br>
<b>To:</b> Maurya, Shivani <<a href="mailto:shivani.maurya@intel.com">shivani.maurya@intel.com</a>>;
<a href="mailto:wernli@in2p3.fr">wernli@in2p3.fr</a>; Syslog-ng users' and developers' mailing list <<a href="mailto:syslog-ng@lists.balabit.hu">syslog-ng@lists.balabit.hu</a>><br>
<b>Subject:</b> Re: [syslog-ng] Customizing syslog-ng snmp() destination option</span></p>
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<p class="x_MsoNormal"><span style="color:black">Thanks Shivani for the example!<br>
<br>
I didn't know "agent-addr" is a standardized SNMPv1 trap element.<br>
I've found it in the SNMPv1 RFC too. [1]</span></p>
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<p class="x_MsoNormal"><span style="color:black">Unfortunately, syslog-ng only supports snmpv2c and snmpv3 versions.</span></p>
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<p class="x_MsoNormal"><span style="color:black">I've checked the code of snmp-dest() and I think it would be _relatively_ easy to add snmpv1 support.</span></p>
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<p class="x_MsoNormal"><span style="color:black">I can open a feature request on GitHub, as I'm not sure when we could get to this in the near future, or is there any reason against SNMPv1.</span></p>
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Regards,</span></p>
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<p class="x_MsoNormal"><span style="color:black">Gabor</span></p>
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<p class="x_MsoNormal"><span style="color:black">[1] <a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc1157%2F%23section-4.1.6&data=04%7C01%7CGabor.Nagy%40oneidentity.com%7C574fb68ee07141f2da1308da0c97ba6d%7C91c369b51c9e439c989c1867ec606603%7C0%7C1%7C637836143070345948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=sxX1x%2BMG02oLeVAtBBPjpcMYkXbAzHRvWEvfoh9KQ%2FI%3D&reserved=0" originalsrc="https://datatracker.ietf.org/doc/html/rfc1157/#section-4.1.6" shash="Gm/YeuWYUw2GtdNBzXMpQUWqugGc8SCndpL/D+U4idpZlD3JWSCYw+7JvWgEqpvLLrzkAFDl7jZk/5DaPisR+5gGTYixx0iILmspvhVzz06a17c35XKUHlOB3cuSo/zviF2v8eu69IyTEBjmlSZSWb9Ms0W2mHwQzLjZFOz3Vik=">https://datatracker.ietf.org/doc/html/rfc1157/#section-4.1.6</a></span></p>
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<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> syslog-ng <<a href="mailto:syslog-ng-bounces@lists.balabit.hu">syslog-ng-bounces@lists.balabit.hu</a>> on behalf of Fabien Wernli <<a href="mailto:wernli@in2p3.fr">wernli@in2p3.fr</a>><br>
<b>Sent:</b> Tuesday, March 22, 2022 8:12<br>
<b>To:</b> Maurya, Shivani <<a href="mailto:shivani.maurya@intel.com">shivani.maurya@intel.com</a>><br>
<b>Cc:</b> Syslog-ng users' and developers' mailing list <<a href="mailto:syslog-ng@lists.balabit.hu">syslog-ng@lists.balabit.hu</a>><br>
<b>Subject:</b> Re: [syslog-ng] Customizing syslog-ng snmp() destination option</span>
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<br>
Hi again,<br>
<br>
On Tue, Mar 22, 2022 at 06:09:32AM +0000, Maurya, Shivani wrote:<br>
> But this is how I want an extra field to be added in trap itself before the variable-binding -<br>
><br>
> [<a href="cid:image002.png@01D83DE1.7C82C330">cid:image002.png@01D83DE1.7C82C330</a>]<br>
<br>
As I said, I think you can achieve this using `snmp-obj()`.<br>
Try the following:<br>
<br>
snmp-obj('.1.3.6.1.6.3.18.1.3.0', 'Ipaddress', "${SOURCEIP}")<br>
<br>
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