Added debug extension (#155)

payloads/extensions/debug.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+################################################################################
+# Allow Debugging messages written to: "/root/udisk/debug/[session].txt"
+# on the BashBunny
+#
+# How this works?
+# 1) Example Command: DEBUG "switch-1-debug" "Hello from debug extension!"
+# 2) After bashing, text can be read at: "/root/udisk/debug/[session].txt"
+#    on the BashBunny
+################################################################################
+
+function DEBUG() {
+    session = $1
+    message = $2
+
+    init_debug
+    debug_log
+
+    timestamp () {
+        echo "$(date +"%Y-%m-%d_%H-%M-%S")"
+    }
+
+    init_debug () {
+        DEBUG_FILE="/root/udisk/debug/$(session).txt"
+        if [ ! -d "/root/udisk/debug/" ]; then
+          mkdir /root/udisk/debug/
+        fi
+        if [ ! -f "/root/udisk/debug/${DEBUG_FILE}" ]; then
+            touch "${DEBUG_FILE}"
+            echo "$(timestamp): DEBUG STARTED" >> "${DEBUG_FILE}"
+        fi
+    }
+
+    debug_log () {
+        echo "$(timestamp): $(message)" >> "${DEBUG_FILE}"
+    }
+}
+
+export -f DEBUG