Created
December 14, 2021 14:53
-
-
Save maikgreubel/132d7d49dc429666941d8da0bc22495d to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| for o in $(grep -A1 "failed mail authentication attempt for user" /var/log/maillog |grep "authentication fail" | perl -pe 's#.*unknown\[([^\]].*?)\].*#\1#' | grep -E "^[[:digit:]]+" | uniq); do whois $o | grep -E "([0-9]{1,3}[\.]){3}[0-9]{1,3}\/" | grep -v "^%" | awk '{print $2}'; done |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
one liner to find and list ip addresses in maillog