Date: Tue, 24 Feb 2026 12:03:22 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 293417] bsnmpd: no RFC 2741 AgentX server-side support Message-ID: <bug-293417-227@https.bugs.freebsd.org/bugzilla/>
index | next in thread | raw e-mail
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293417 Bug ID: 293417 Summary: bsnmpd: no RFC 2741 AgentX server-side support Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: bms@FreeBSD.org Full disclosure: This is a sub-project I would be keen to seek financial backing for, and the stakeholders most likely to benefit should really sponsor it; I am currently unwaged as of writing. AgentX support is defined in RRC 2741, Agent Extensibility (AgentX) Protocol Version 1: https://datatracker.ietf.org/doc/rfc2741 The inability to host AgentX sub-agents is a major limitation of bsnmpd, particularly for consumers such as OPNsense and pfSense, which currently just ship bsnmpd and not net-snmp by default, limiting their utility in common network monitoring and telemetry deployments. This most likely involves merging the OpenBSD implementation of server-side AgentX for their snmpd, or otherwise basing off it. I have other AgentX work planned for other projects, so this is orthogonal to that. SMUX support would be horribly obsolete and could only be suggested as a bandaid, nothing more. I did chime in on a freebsd-net@ thread from 16 years ago where I foresaw the AgentX requirement. It is irksome because bsnmpd historically had richer support for native FreeBSD system reporting than net-snmp did out of the box. Is this still the case? That is an open question. The UCD module exists in ports, but was not merged to src. Notably the pf(4) MIB is in src, also. The dynamically loaded bsnmpd modules are still under active development in FreeBSD src itself as of 2025-12-30. There is some SNMPv3 USM support. Reyk Floeter's OpenBSD snmpd(8) is using their internal AgentX library for server-side use. See: https://sourcegraph.com/github.com/openbsd/src Added in commit 4100cc5 by martijn@. "Current omissions in protocol support are notifications, index (de)allocation, and agent capabilities." PacketID logic was removed in commit b26e507. Header file cleanup in commit a9292d2. Minor fix in commit 2315138. Overlap in terms of function and variable names with <libagentx/ax.h>. The actual agentx shim is in usr.sbin/snmpd/application_agentx.c. It appears to be using the routines from usr.sbin/snmpd/ax.[ch] but it is unclear if this is a vendorized dependency or if libagentx is really separate. Configuration syntax added in usr.sbin/snmpd/parse.y. When reading around, I noticed ae@ had a patch to add IPv6 support to bsnmpd. It looks like an extensively modified version of the original patch was committed from https://reviews.freebsd.org/D16654. That is a starting point for learning to hack bsnmpd. -- You are receiving this mail because: You are the assignee for the bug.home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-293417-227>