RDK-59964 : ZeroConfig (IPv4LL) support for EntOS - AirPlay Devices #406

gururaajar · 2025-12-26T15:20:32Z

Reason for change: NetworkManager Dispatcher to launch avahi-autoipd to launch, when interface connected and clean-up IPv4LL when IPv4 is received.
Test Procedure: check whether link local IPv4 is assigned to wlan0 and eth0 when there is no valid IP.
Priority:P1
Risks: Medium

Reason for change: NetworkManager Dispatcher to launch avahi-autoipd to launch, when interface connected and clean-up IPv4LL when IPv4 is received. Test Procedure: check whether link local IPv4 is assigned to wlan0 and eth0 when there is no valid IP. Priority:P1 Risks: Medium Signed-off-by: Gururaaja ESR<Gururaja_ErodeSriranganRamlingham@comcast.com>

…to topic/RDK-59964_new

Copilot

Pull request overview

This PR adds IPv4 Link-Local (ZeroConfig) support for CentOS-based AirPlay devices using avahi-autoipd. When network interfaces connect without receiving a valid IPv4 address via DHCP, a link-local IPv4 address (169.254.x.x) is automatically assigned. The implementation uses NetworkManager dispatcher to manage the lifecycle of avahi-autoipd services.

Changes:

Added new script to start avahi-autoipd when network interfaces come up without global IPv4
Modified NetworkManager dispatcher to stop avahi-autoipd when DHCP IPv4 is received
Configured DHCP timeout behavior for eth0 interface to support ZeroConfig fallback

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
lib/rdk/startLinkLocal.sh	New script that launches avahi-autoipd service for eth0/wlan0 interfaces when no global IPv4 is present
lib/rdk/NM_Dispatcher.sh	Added stop_zero_conf() function to clean up IPv4LL when DHCP IPv4 is acquired; adjusted DHCP timeout settings

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Copilot · 2026-01-15T03:30:18Z

lib/rdk/startLinkLocal.sh

+
+interfaceName=$1
+
+Log "From NM_preUp.sh $interfaceName"


The comment references 'NM_preUp.sh' but this script is 'startLinkLocal.sh'. This should be corrected to reference the actual script name.

Suggested change

Log "From NM_preUp.sh $interfaceName"

Log "From startLinkLocal.sh $interfaceName"

Copilot · 2026-01-15T03:30:19Z

lib/rdk/startLinkLocal.sh

+
+Log()
+{
+    echo "$(/bin/timestamp) : $0: $*" >> $LOG_FILE


The variable $LOG_FILE should be quoted to prevent word splitting and globbing issues if the path contains spaces or special characters. Use >> "$LOG_FILE" instead.

Suggested change

echo "$(/bin/timestamp) : $0: $*" >> $LOG_FILE

echo "$(/bin/timestamp) : $0: $*" >> "$LOG_FILE"

Copilot · 2026-01-15T03:30:19Z

lib/rdk/NM_Dispatcher.sh

+        if [[ "$interfaceName" == "eth0" ]]; then
+            WiredConnectionUUID=$(nmcli -t -f UUID,DEVICE connection show --active | grep ":$interfaceName$" | cut -d: -f1)
+            if [ -n "$WiredConnectionUUID" ]; then
+                nmcli connection modify "$WiredConnectionUUID" ipv4.dhcp-timeout 0
+                nmcli device reapply "$interfaceName"
+            fi
+        fi


This block sets DHCP timeout to 0 when DHCP is received, but there's no comment explaining why this is necessary or how it relates to the ZeroConfig cleanup. Adding a comment would improve maintainability, especially since startLinkLocal.sh sets it to 'infinity'.

…to topic/RDK-59964_new

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

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Copilot · 2026-01-15T03:47:14Z

lib/rdk/startLinkLocal.sh

+if [[ -n "$interfaceName" && ("$interfaceName" == "wlan0" || "$interfaceName" == "eth0") ]];then
+    if [[ "$interfaceName" == "eth0" ]];then


The condition syntax mixes POSIX test construct with bash-specific double brackets. For consistency with the shebang '#!/bin/sh' and broader portability, consider using POSIX-compliant syntax: if [ -n \"$interfaceName\" ] && { [ \"$interfaceName\" = \"wlan0\" ] || [ \"$interfaceName\" = \"eth0\" ]; }; then

Suggested change

if [[ -n "$interfaceName" && ("$interfaceName" == "wlan0" || "$interfaceName" == "eth0") ]];then

if [[ "$interfaceName" == "eth0" ]];then

if [ -n "$interfaceName" ] && { [ "$interfaceName" = "wlan0" ] || [ "$interfaceName" = "eth0" ]; }; then

if [ "$interfaceName" = "eth0" ]; then

Copilot · 2026-01-15T03:47:14Z

lib/rdk/startLinkLocal.sh

+if [[ -n "$interfaceName" && ("$interfaceName" == "wlan0" || "$interfaceName" == "eth0") ]];then
+    if [[ "$interfaceName" == "eth0" ]];then


The condition uses bash-specific double brackets and '==' operator. For consistency with the shebang '#!/bin/sh' and broader portability, use POSIX-compliant syntax: if [ \"$interfaceName\" = \"eth0\" ]; then

Suggested change

if [[ -n "$interfaceName" && ("$interfaceName" == "wlan0" || "$interfaceName" == "eth0") ]];then

if [[ "$interfaceName" == "eth0" ]];then

if [ -n "$interfaceName" ] && { [ "$interfaceName" = "wlan0" ] || [ "$interfaceName" = "eth0" ]; }; then

if [ "$interfaceName" = "eth0" ]; then

Copilot · 2026-01-15T03:47:15Z

lib/rdk/NM_Dispatcher.sh

+        if [[ "$interfaceName" == "eth0" ]]; then
+            WiredConnectionUUID=$(nmcli -t -f UUID,DEVICE connection show --active | grep ":$interfaceName$" | cut -d: -f1)
+            if [ -n "$WiredConnectionUUID" ]; then
+                nmcli connection modify "$WiredConnectionUUID" ipv4.dhcp-timeout 0
+                nmcli device reapply "$interfaceName"
+            fi
+        fi
+        if [[ "$interfaceName" == "wlan0" ]]; then
+            WifiConnectionUUID=$(nmcli -t -f UUID,DEVICE connection show --active | grep ":$interfaceName$" | cut -d: -f1)
+            if [ -n "$WifiConnectionUUID" ]; then
+                nmcli connection modify "$WifiConnectionUUID" ipv4.dhcp-timeout 0
+                nmcli device reapply "$interfaceName"
+            fi
+        fi


This code block contains significant duplication - the same logic is repeated for both eth0 and wlan0. Consider consolidating this into a single block that executes for both interfaces, reducing code duplication and improving maintainability.

Suggested change

if [[ "$interfaceName" == "eth0" ]]; then

WiredConnectionUUID=$(nmcli -t -f UUID,DEVICE connection show --active | grep ":$interfaceName$" | cut -d: -f1)

if [ -n "$WiredConnectionUUID" ]; then

nmcli connection modify "$WiredConnectionUUID" ipv4.dhcp-timeout 0

nmcli device reapply "$interfaceName"

fi

fi

if [[ "$interfaceName" == "wlan0" ]]; then

WifiConnectionUUID=$(nmcli -t -f UUID,DEVICE connection show --active | grep ":$interfaceName$" | cut -d: -f1)

if [ -n "$WifiConnectionUUID" ]; then

nmcli connection modify "$WifiConnectionUUID" ipv4.dhcp-timeout 0

nmcli device reapply "$interfaceName"

fi

fi

if [[ "$interfaceName" == "eth0" || "$interfaceName" == "wlan0" ]]; then

ConnectionUUID=$(nmcli -t -f UUID,DEVICE connection show --active | grep ":$interfaceName$" | cut -d: -f1)

if [ -n "$ConnectionUUID" ]; then

nmcli connection modify "$ConnectionUUID" ipv4.dhcp-timeout 0

nmcli device reapply "$interfaceName"

fi

fi

Copilot · 2026-01-15T03:47:15Z

lib/rdk/NM_Dispatcher.sh


 if [ "x$interfaceName" != "x" ] && [ "$interfaceName" != "lo" ]; then
    if [ "$interfaceStatus" == "dhcp4-change" ]; then
+        if [[ "$interfaceName" == "eth0" ]]; then


The condition uses bash-specific double brackets and '==' operator. For consistency with the shebang '#!/bin/sh' in this file and broader portability, use POSIX-compliant syntax: if [ \"$interfaceName\" = \"eth0\" ]; then

Copilot · 2026-01-15T03:47:15Z

lib/rdk/NM_Dispatcher.sh

+                nmcli device reapply "$interfaceName"
+            fi
+        fi
+        if [[ "$interfaceName" == "wlan0" ]]; then


The condition uses bash-specific double brackets and '==' operator. For consistency with the shebang '#!/bin/sh' in this file and broader portability, use POSIX-compliant syntax: if [ \"$interfaceName\" = \"wlan0\" ]; then

gururaajar requested a review from a team as a code owner December 26, 2025 15:20

gururaajar added 10 commits December 26, 2025 13:11

Merge branch 'topic/RDK-59964_new' of github.com:rdkcentral/sysint in…

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gururaajar added 3 commits January 14, 2026 22:41

Merge branch 'topic/RDK-59964_new' of github.com:rdkcentral/sysint in…

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Merge branch 'topic/RDK-59964_new' of github.com:rdkcentral/sysint in…

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Merge branch 'develop' into topic/RDK-59964_new

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RDK-59964 : ZeroConfig (IPv4LL) support for EntOS - AirPlay Devices #406

RDK-59964 : ZeroConfig (IPv4LL) support for EntOS - AirPlay Devices #406

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	Log "From NM_preUp.sh $interfaceName"
	Log "From startLinkLocal.sh $interfaceName"

	echo "$(/bin/timestamp) : $0: $*" >> $LOG_FILE
	echo "$(/bin/timestamp) : $0: $*" >> "$LOG_FILE"

		if [[ -n "$interfaceName" && ("$interfaceName" == "wlan0" \|\| "$interfaceName" == "eth0") ]];then
		if [[ "$interfaceName" == "eth0" ]];then

RDK-59964 : ZeroConfig (IPv4LL) support for EntOS - AirPlay Devices #406

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RDK-59964 : ZeroConfig (IPv4LL) support for EntOS - AirPlay Devices #406

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gururaajar commented Dec 26, 2025

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