From 0c6363572b2ddde8c44f3bd5d06dfff92f929380 Mon Sep 17 00:00:00 2001
From: DL6ER <dl6er@dl6er.de>
Date: Mon, 25 Dec 2023 22:00:49 +0100
Subject: [PATCH 1/2] Append the interface to the gateway address if it is a
 link-local address

Signed-off-by: DL6ER <dl6er@dl6er.de>
---
 advanced/Scripts/piholeDebug.sh | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/advanced/Scripts/piholeDebug.sh b/advanced/Scripts/piholeDebug.sh
index aa0e61c4..a78f94ee 100755
--- a/advanced/Scripts/piholeDebug.sh
+++ b/advanced/Scripts/piholeDebug.sh
@@ -547,17 +547,24 @@ 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
+    local gateway gateway_addr gateway_iface
 
     log_write "${INFO} Default IPv${protocol} gateway(s):"
 
     while IFS= read -r gateway; do
-        log_write "     ${gateway}"
-    done < <(ip -"${protocol}" route | grep default | cut -d ' ' -f 3)
+        log_write "     $(cut -d ' ' -f 3 <<< "${gateway}")%$(cut -d ' ' -f 5 <<< "${gateway}")"
+    done < <(ip -"${protocol}" route | grep default)
 
-    gateway=$(ip -"${protocol}" route | grep default | cut -d ' ' -f 3 | head -n 1)
+    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 "${gateway}" ]; then
+    if [ -n "${gateway_addr}" ]; then
+        # Append the interface to the gateway address if it is a link-local address
+        if [[ "${gateway_addr}" =~ ^fe80 ]]; then
+            gateway="${gateway_addr}%${gateway_iface}"
+        else
+            gateway="${gateway_addr}"
+        fi
         # Let the user know we will ping the gateway for a response
         log_write "   * Pinging first gateway ${gateway}..."
         # Try to quietly ping the gateway 3 times, with a timeout of 3 seconds, using numeric output only,

From 00340136bdc517cc71d4458fb5ccd8d784724767 Mon Sep 17 00:00:00 2001
From: DL6ER <dl6er@dl6er.de>
Date: Tue, 26 Dec 2023 21:35:24 +0100
Subject: [PATCH 2/2] Extend %iface logic to the dig test. Also fix intentation
 in this function

Signed-off-by: DL6ER <dl6er@dl6er.de>
---
 advanced/Scripts/piholeDebug.sh | 39 +++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/advanced/Scripts/piholeDebug.sh b/advanced/Scripts/piholeDebug.sh
index a78f94ee..2c3ebb14 100755
--- a/advanced/Scripts/piholeDebug.sh
+++ b/advanced/Scripts/piholeDebug.sh
@@ -764,24 +764,29 @@ dig_at() {
         #          Removes CIDR and everything thereafter (e.g., scope properties)
         addresses="$(ip address show dev "${iface}" | sed "/${sed_selector} /!d;s/^.*${sed_selector} //g;s/\/.*$//g;")"
         if [ -n "${addresses}" ]; then
-          while IFS= read -r local_address ; do
+            while IFS= read -r local_address ; do
+                # If ${local_address} is an IPv6 link-local address, append the interface name to it
+                if [[ "${local_address}" =~ ^fe80 ]]; then
+                    local_address="${local_address}%${iface}"
+                fi
+
               # Check if Pi-hole can use itself to block a domain
-              if local_dig="$(dig +tries=1 +time=2 -"${protocol}" "${random_url}" @"${local_address}" "${record_type}")"; then
-                  # If it can, show success
-                  if [[ "${local_dig}" == *"status: NOERROR"* ]]; then
-                    local_dig="NOERROR"
-                  elif [[ "${local_dig}" == *"status: NXDOMAIN"* ]]; then
-                    local_dig="NXDOMAIN"
-                  else
-                    # Extract the first entry in the answer section from dig's output,
-                    # replacing any multiple spaces and tabs with a single space
-                    local_dig="$(echo "${local_dig}" | grep -A1 "ANSWER SECTION" | grep -v "ANSWER SECTION" | tr -s " \t" " ")"
-                  fi
-                  log_write "${TICK} ${random_url} ${COL_GREEN}is ${local_dig}${COL_NC} on ${COL_CYAN}${iface}${COL_NC} (${COL_CYAN}${local_address}${COL_NC})"
-              else
-                  # Otherwise, show a failure
-                  log_write "${CROSS} ${COL_RED}Failed to resolve${COL_NC} ${random_url} on ${COL_RED}${iface}${COL_NC} (${COL_RED}${local_address}${COL_NC})"
-              fi
+                if local_dig="$(dig +tries=1 +time=2 -"${protocol}" "${random_url}" @"${local_address}" "${record_type}")"; then
+                    # If it can, show success
+                    if [[ "${local_dig}" == *"status: NOERROR"* ]]; then
+                        local_dig="NOERROR"
+                    elif [[ "${local_dig}" == *"status: NXDOMAIN"* ]]; then
+                        local_dig="NXDOMAIN"
+                    else
+                        # Extract the first entry in the answer section from dig's output,
+                        # replacing any multiple spaces and tabs with a single space
+                        local_dig="$(echo "${local_dig}" | grep -A1 "ANSWER SECTION" | grep -v "ANSWER SECTION" | tr -s " \t" " ")"
+                    fi
+                    log_write "${TICK} ${random_url} ${COL_GREEN}is ${local_dig}${COL_NC} on ${COL_CYAN}${iface}${COL_NC} (${COL_CYAN}${local_address}${COL_NC})"
+                else
+                    # Otherwise, show a failure
+                    log_write "${CROSS} ${COL_RED}Failed to resolve${COL_NC} ${random_url} on ${COL_RED}${iface}${COL_NC} (${COL_RED}${local_address}${COL_NC})"
+                fi
           done <<< "${addresses}"
         else
           log_write "${TICK} No IPv${protocol} address available on ${COL_CYAN}${iface}${COL_NC}"