Tests: Pi-hole PTR generation check

Signed-off-by: DL6ER <dl6er@dl6er.de>

test/hostnames.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+# Test script to test names returned for local interfaces
+# The logic of this mechanism has been extracted from piholeDebug.sh
+
+getIPs() {
+    local dig_result addr
+    local addr_type
+    addr_type=$1
+    local protocol
+    protocol=$2
+
+    addresses="$(ip address show | sed "/${addr_type} /!d;s/^.*${addr_type} //g;s/\/.*$//g;")"
+    if [ -n "${addresses}" ]; then
+        while IFS= read -r addr ; do
+            # Check if Pi-hole can use itself to block a domain
+            dig_result=$(dig +tries=1 +time=2 -"${protocol}" -x "${addr}" @127.0.0.1 +short)
+            if [[ $addr == "127.0.0.1" && $dig_result == "localhost." ]] || [[ $addr == "::1" &&  $dig_result == "ip6-localhost." ]] || [[ $dig_result == "pi.hole." ]]; then
+                echo "${addr} is \"${dig_result}\": OK"
+            else
+                # Otherwise, show a failure
+                echo "${addr}: ERROR"
+                echo "${dig_result}"
+                echo ""
+            fi
+        done <<< "${addresses}"
+    fi
+}
+
+# Test PTR responses on all available IPv4 addresses
+getIPs inet 4
+# Test PTR responses on all available IPv6 addresses
+getIPs inet6 6

test/test_suite.bats

@@ -1283,3 +1283,9 @@
   [[ ${lines[0]} == "Hello from LUA" ]]
   rm abc.lua
 }
+
+@test "Pi-hole PTR generation check" {
+  run bash -c "bash test/hostnames.sh | tee dig.log"
+  printf "%s\n" "${lines[@]}"
+  [[ "${lines[@]}" != *"ERROR"* ]]
+}