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piholeDebug - Get default route robustly

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Determine address and interface of default route by preceeding
    'via' and 'dev' fields in json output instead of plain text
    field position.

    Log if unable to determine default gateway

Signed-off-by: Rob Gill <rrobgill@protonmail.com>
This commit is contained in:
Rob Gill 2025-06-25 05:10:12 +10:00
parent 404dc7cb88
commit 19d5943440
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GPG Key ID: 625CBEA2C626280D
1 changed files with 15 additions and 6 deletions
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21
advanced/Scripts/piholeDebug.sh
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@ -497,16 +497,25 @@ ping_gateway() {
ping_ipv4_or_ipv6 "${protocol}"
# Check if we are using IPv4 or IPv6
# Find the default gateways using IPv4 or IPv6
local gateway gateway_addr gateway_iface
local gateway gateway_addr gateway_iface default_route
log_write "${INFO} Default IPv${protocol} gateway(s):"
while IFS= read -r gateway; do
log_write " $(cut -d ' ' -f 3 <<< "${gateway}")%$(cut -d ' ' -f 5 <<< "${gateway}")"
done < <(ip -"${protocol}" route | grep default)
while IFS= read -r default_route; do
gateway_addr=$(jq -r '.gateway' <<< "${default_route}")
gateway_iface=$(jq -r '.dev' <<< "${default_route}")
log_write " ${gateway_addr}%${gateway_iface}"
done < <(ip -j -"${protocol}" route | jq -c '.[] | select(.dst == "default")')
# Find the first default route
default_route=$(ip -j -"${protocol}" route show default)
if echo "$default_route" | grep 'gateway' | grep -q 'dev'; then
gateway_addr=$(echo "$default_route" | jq -r -c '.[0].gateway')
gateway_iface=$(echo "$default_route" | jq -r -c '.[0].dev')
else
log_write " Unable to determine gateway address for IPv${protocol}"
fi
gateway_addr=$(ip -"${protocol}" route | grep default | cut -d ' ' -f 3 | head -n 1)
gateway_iface=$(ip -"${protocol}" route | grep default | cut -d ' ' -f 5 | head -n 1)
# If there was at least one gateway
if [ -n "${gateway_addr}" ]; then
# Append the interface to the gateway address if it is a link-local address