Add new functionality for omuxsock in rsyslog

[BinduSri-6522866]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

---

Summary

net: Add NetworkNamespace APIs Moves network namespace management logic out of individual plugins and into rsyslog's shared net module as reusable APIs, so any plugin can switch into a Linux network namespace to open a socket without duplicating the code.
add-network-namespace-APIs.patch :

• Adds reusable netns_save, netns_switch, netns_restore, and netns_socket APIs.
• Moves omfwd namespace handling into the shared lmnet module.
• Increments the internal net interface from v10 to v11.
• Fixes the namespace forwarding test’s quoted port variable.
• Adds Valgrind suppressions for newer glibc.
• Patch2 directly depends on this API and must remain ordered after Patch1.

New functionality for omuxsock Upgrades the omuxsock output plugin to support abstract Unix socket names, connection-oriented sockets (STREAM/SEQPACKET), and sending log messages into a different Linux network namespace, while also fixing a bug that caused the socket to be unnecessarily closed and reopened for every message.
adding-new-functionality-for-omuxsock.patch :

• Adds abstract Unix socket support.
• Adds SOCK_STREAM and SOCK_SEQPACKET; retains SOCK_DGRAM as default.
• Adds module/action parameters: SocketName, SocketType, Abstract, and NetworkNamespace.
• Supports multiple independent omuxsock actions.
• Stops closing and reopening a valid socket for every message.
• Adds normal, abstract, multi-instance, namespace, STREAM and SEQPACKET tests.
• Includes the upstream Valgrind test gating correction.

[Fix message loss for connected Unix domain sockets] Fixes a regression where an omuxsock STREAM or SEQPACKET connection remained unusable after a send error, causing all subsequent messages to be silently dropped until rsyslog restarted.
[fix-message-loss-bug-for-connected-Unix-domain-sockets.patch]:

• Detects failed and incomplete socket sends correctly using ssize_t.
• Closes failed connected sockets and returns RS_RET_SUSPENDED.
• Allows rsyslog’s action infrastructure to reconnect automatically.
• Preserves unsuspended retry-on-next-message behavior for SOCK_DGRAM.
• Adds send length, transmitted length, and error details to diagnostics.
• Adds receiver-reset recovery tests for pathname, abstract, multi-instance, namespace, STREAM, and SEQPACKET sockets.
• Includes the upstream POSIX shell portability corrections.
• Directly depends on Patch2’s connected socket support and must remain ordered after Patch2.

Change Log

• new file: ../SPECS/rsyslog/add-network-namespace-APIs.patch
• new file: ../SPECS/rsyslog/adding-new-functionality-for-omuxsock.patch
• new file: ../SPECS/rsyslog/fix-message-loss-bug-for-connected-Unix-domain-sockets.patch
• modified: ../SPECS/rsyslog/rsyslog.spec

Does this affect the toolchain?

NO

Test Methodology

• Local Build:
  rsyslog-8.2308.0-6.azl3.src.rpm.log
  rsyslog-8.2308.0-6.azl3.src.rpm.test.log

Patch application:

Installation and Uninstallation:

[azure-pipelines]

Azure Pipelines:
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[BinduSri-6522866]

1. Post-Installation omuxsock Feature Sanity Test
   Validates the installed rsyslog package across multiple outputs, abstract sockets, DGRAM, STREAM, SEQPACKET, network namespaces, and recovery after connected-socket failures.
   Post-Installation_Sanity_Testing.docx

2. Abstract Unix Socket and FD Stability Test
   Validates message delivery through an installed omuxsock abstract Unix socket and checks that sending repeated messages does not cause file-descriptor growth.
   smoke_test_plus_resource-leak_sanity_checking.docx

3. Source-Tree Regression Test Suite
   Runs the PR-provided test scripts manually to validate omuxsock behavior, namespace forwarding, reconnection, message-loss handling, and optional Valgrind memory checks.
   Regression_tests.docx

[azure-pipelines]

Azure Pipelines:
There may be pipelines that require an authorized user to comment /azp run to run.

[bhagyapathak]

• Changes looks good.
• All three upstream patches apply cleanly.
• The upstream unit tests pass successfully when run in a privileged container with Valgrind installed and rsyslog built using the --enable-valgrind option.
• The new functionality introduced by the upstream PR works as expected.
• Buddy Build - https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1174345&view=results