fakepopserver.sh
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#!/usr/bin/env bash
# Fake POP3 server
# By Marcus Bointon <phpmailer@synchromedia.co.uk>
# Based on code by 'Frater' found at http://www.linuxquestions.org/questions/programming-9/fake-pop3-server-to-capture-pop3-passwords-933733
# Does not actually serve any mail, but supports commands sufficient to test POP-before SMTP
# Can be run directly from a shell like this:
# mkfifo fifo; nc -l 1100 <fifo |./fakepopserver.sh >fifo; rm fifo
# It will accept any user name and will return a positive response for the password 'test'
# Licensed under the GNU Lesser General Public License: http://www.gnu.org/copyleft/lesser.html
# Enable debug output
#set -xv
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
LOGFOLDER=/tmp
LOGFILE=${LOGFOLDER}/fakepop.log
LOGGING=1
DEBUG=1
TIMEOUT=60
POP_USER=
POP_PASSWRD=test
LINES=1
BREAK=0
write_log () {
if [ ${LINES} -eq 1 ] ; then
echo '---' >>${LOGFILE}
fi
let LINES+=1
[ ${LOGGING} = 0 ] || echo -e "`date '+%b %d %H:%M'` pop3 $*" >>${LOGFILE}
}
ANSWER="+OK Fake POP3 Service Ready"
while [ ${BREAK} -eq 0 ] ; do
echo -en "${ANSWER}\r\n"
REPLY=""
#Input appears in $REPLY
read -t ${TIMEOUT}
ANSWER="+OK "
COMMAND=""
ARGS=""
TIMEOUT=30
if [ "$REPLY" ] ; then
write_log "RAW input: '`echo "${REPLY}" | tr -cd '[ -~]'`'"
COMMAND="`echo "${REPLY}" | awk '{print $1}' | tr -cd '\40-\176' | tr 'a-z' 'A-Z'`"
ARGS="`echo "${REPLY}" | tr -cd '\40-\176' | awk '{for(i=2;i<=NF;i++){printf "%s ", $i};printf "\n"}' | sed 's/ $//'`"
write_log "Command: \"${COMMAND}\""
write_log "Arguments: \"${ARGS}\""
case "$COMMAND" in
QUIT)
break
;;
USER)
if [ -n "${ARGS}" ] ; then
POP_USER="${ARGS}"
ANSWER="+OK Please send PASS command"
fi
;;
AUTH)
ANSWER="+OK \r\n."
;;
CAPA)
ANSWER="+OK Capabilities include\r\nUSER\r\nCAPA\r\n."
;;
PASS)
if [ "${POP_PASSWRD}" == "${ARGS}" ] ; then
ANSWER="+OK Logged in."
AUTH=1
else
ANSWER="-ERR Login failed."
fi
;;
LIST)
if [ "${AUTH}" = 0 ] ; then
ANSWER="-ERR Not authenticated"
else
if [ -z "${ARGS}" ] ; then
ANSWER="+OK No messages, really\r\n."
else
ANSWER="-ERR No messages, no list, no status"
fi
fi
;;
RSET)
ANSWER="+OK Resetting or whatever\r\n."
;;
LAST)
if [ "${AUTH}" = 0 ] ; then
ANSWER="-ERR Not authenticated"
else
ANSWER="+OK 0"
fi
;;
STAT)
if [ "${AUTH}" = 0 ] ; then
ANSWER="-ERR Not authenticated"
else
ANSWER="+OK 0 0"
fi
;;
NOOP)
ANSWER="+OK Hang on, doing nothing"
;;
esac
else
echo "+OK Connection timed out"
break
fi
done
echo "+OK Bye!\r\n"