Add host identifier options and use manual configured setting in function

default.prf

@@ -417,6 +417,12 @@ ssl-certificate-paths=/etc/apache2:/etc/dovecot:/etc/httpd:/etc/letsencrypt:/etc
 # This is useful for ephemeral systems which are short-lived.
 #allow-auto-purge=yes
 
+# Sometimes it might be useful to override the host identifiers.
+# Use only hexadecimal values (0-9, a-f), with 40 and 64 characters in length.
+#
+#hostid=40-char-hash
+#hostid2=64-char-hash
+
 # Proxy settings
 # Protocol (http, https, socks5)
 #proxy-protocol=https

include/functions

@@ -804,11 +804,17 @@
     # Name        : GetHostID()
     # Description : Create an unique id for the system
     #
-    # Returns     : Nothing
+    # Returns     : optional value
     # Usage       : GetHostID
     ################################################################################
 
     GetHostID() {
+
+        if [ ! -z "${HOSTID}" -a ! -z "${HOSTID2}" ]; then
+            Debug "Skipping creation of host identifiers, as they are already configured (via profile)"
+            return 1
+        fi
+
         FIND=""
         # Avoid some hashes (empty, only zeros)
         BLACKLISTED_HASHES="6ef1338f520d075957424741d7ed35ab5966ae97 adc83b19e793491b1c6ea0fd8b46cd9f32e592fc"
@@ -1104,6 +1110,8 @@
         # Show an exception if no HostID could be created, to ensure each system (and scan) has one
         if [ "${HOSTID}" = "" ]; then
             ReportException "GetHostID" "No unique host identifier could be created."
+        elif [ ! -z "${HOSTID2}" ]; then
+            return 0
         fi
     }