I'm learning host based firewall by installing `tcp_wrappers.tcz` on Tiny Core Linux (TCL).
Initially, the following files were not there which was expected.
/etc/hosts.allow
/etc/hosts.deny
BEFORE
tc@linux:/etc$ date; ls -lh /etc/host*
Thu May 3 20:20:51 UTC 2018
-rw-rw-r-- 1 root staff 26 Jul 4 2016 /etc/host.conf
-rw-r--r-- 1 root root 4 May 3 20:18 /etc/hostname
-rw-r--r-- 1 root root 290 May 3 20:18 /etc/hosts
tc@linux:/etc$
INSTALLATION
tc@linux:/etc$ tce-load -wi tcp_wrappers.tcz
Downloading: tcp_wrappers.tcz
Connecting to repo.tinycorelinux.net (89.22.99.37:80)
tcp_wrappers.tcz 100% |****************************************************************************************************************************************| 40960 0:00:00 ETA
tcp_wrappers.tcz: OK
tc@linux:/etc$
AFTER
tc@linux:/etc$ date; ls -lh /etc/host*
Thu May 3 20:21:14 UTC 2018
-rw-rw-r-- 1 root staff 26 Jul 4 2016 /etc/host.conf
-rw-r--r-- 1 root root 4 May 3 20:18 /etc/hostname
-rw-r--r-- 1 root root 290 May 3 20:18 /etc/hosts
-rw-r--r-- 1 root root 121 Nov 27 2008 /etc/hosts.allow
-rw-r--r-- 1 root root 119 Nov 27 2008 /etc/hosts.deny
tc@linux:/etc$
Then, I was able to see both files created.
tc@linux:/etc$ cat /etc/hosts.allow
# hosts.allow This file describes the names of the hosts which are allowed access by the '/usr/local/bin/tcpd' server.
tc@linux:/etc$
tc@linux:/etc$ cat /etc/hosts.deny
# hosts.deny This file describes the names of the hosts which are denied access by the '/usr/local/bin/tcpd' server.
tc@linux:/etc$
Unfortunately, `/usr/local/bin/tcpd` was not there.
tc@linux:/etc$ ls -lh /usr/local/bin/tcpd
ls: /usr/local/bin/tcpd: No such file or directory
tc@linux:/etc$
Obviously TCP Wrapper won't work without `tcpd` right?
How to make this work?