SSHChat

# add go
pkg_add go

# add user 'sshchat'
adduser

# switch user
su - sshchat
ftp https://github.com/shazow/ssh-chat/archive/v1.10.tar.gz
tar zxf v1.10.tar.gz
cd ssh-chat-1.10/
make build

# back to root
exit
cp /home/sshchat/ssh-chat-1.10/ssh-chat /usr/local/bin/

# create folder
mkdir -p /etc/pf.d

# sample file
echo "127.0.0.1" > /etc/pf.d/sshchat

# set permission
chmod 600 /etc/pf.d/sshchat

# Table
table <sshchat> persist file  "/etc/pf.d/sshchat"

# Redirect
match in log on egress  proto tcp from <sshchat>     to YOUR-PUBLIC-IP  port 22 rdr-to 127.0.0.1 port 2222

# Allow Rule
pass    log quick       proto tcp  from <sshchat>    to (self)           port { 22 2222 }

pfctl -f /etc/pf.conf

cat << 'EOF' > /etc/rc.shutdown
#!/bin/sh

cp /etc/pf.d/sshchat /var/log/pf-sshchat-$(date +%s)
pfctl -t sshchat -T show |awk '{print $1}' |sort |uniq > /etc/pf.d/sshchat
EOF

chmod 700  /etc/rc.shutdown

# start sshchat
@reboot  ssh-chat --verbose --bind "localhost:2222" --identity /home/sshchat/.ssh/ssh-chat-key