A TCP port redirector for UNIX
This is a TCP port redirector for UNIX. It can be run under inetd or as standalone (in which case it handles multiple connections). It is 8 bit clean, not limited to line mode, is small and lightweight. If you want access control, run it under xinetd, or inetd with TCP wrappers.
Redir listens for TCP connections on a given port, and, when it receives
a connection, then connects to a given destination
pass data between them. It finds most of its applications in traversing
firewalls, but, of course, there are other uses.
For a UDP port redirector, see uredir.
Consult the man page for details.
Usage: redir [-hinspv] [-b IP] [-f TYPE] [-I NAME] [-l LEVEL] [-t SEC] [-x STR] [-m BPS] [-o FLAG] [-w MSEC] [-z BYTES] [SRC]:PORT [DST]:PORT Options: -b, --bind=IP Force specific IP to bind() to when listening for incoming connections. Not applicable with -p -f, --ftp=TYPE Redirect FTP connections. Where type is one of: 'port', 'pasv', or 'both' -h, --help Show this help text -i, --inetd Run from inetd, SRC:PORT comes from stdin Usage: redir [OPTIONS] [DST]:PORT -I, --ident=NAME Identity, tag syslog messages with NAME Also used as service name for TCP wrappers -l, --loglevel=LEVEL Set log level: none, err, notice*, info, debug -n, --foreground Run in foreground, do not detach from terminal -p, --transproxy Run in Linux's transparent proxy mode -s, --syslog Log messages to syslog -t, --timeout=SEC Set timeout to SEC seconds, default off (0) -v, --version Show program version -x, --connect=STR CONNECT string passed to proxy server Traffic Shaping: -m, --max-bandwidth=BPS Limit the bandwidth to BPS bits/second -o, --wait-in-out=FLAG Wait for in(1), out(2), or in&out(3) -w, --random-wait=MSEC Wait MSEC milliseconds before each packet -z, --bufsize=BYTES Size of the traffic shaping buffer SRC and DST are optional, redir will revert to use 0.0.0.0 (ANY)
Command line options changed in v3.0. A limited subset of the old
syntax is available with the
--enable-compat configure option.
This implicitly also enables
-n by default.
The following subset of the old syntax are available:
--lport=PORT Local port (when not running from inetd) --laddr=ADDRESS Local address (when not running from inetd) --cport=PORT Remote port to redirect traffic to --caddr=ADDRESS Remote address to redirect traffic to
To redirect port 80 to a webserver listening on loopback port 8080,
remember to use
sudo when using priviliged ports:
sudo redir :80 127.0.0.1:8080
redir as a standard UNIX daemon in the background, with
all log messages sent to the syslog. Use
-n to foreground and see log
redir from a process monitor like Finit or systemd, tell it
to not background itself and to only use the syslog for log messages:
redir -n -s :80 127.0.0.1:8080
/etc/inetd.conf line of the same looks very similar:
http stream tcp nowait root /usr/sbin/tcpd /usr/bin/redir -n -s -i 127.0.0.1:8080
When running multiple redir instances it can be useful to change how they identify themselves:
redir -I nntp www:119 netgate:119 redir -I pop3 ftp:110 netgate:110
This starts an NNTP and a POP3 port redirector, named accordingly.
Previously therere was a
redir-wrapper script included in the
distribution, but that is no longer maintained.
Redir comes with a GNU configure script which you can use to adapt the build to your needs. If you would like to remove support for some extended options (for the sake of speed, code size, whatever), try the following options to configure:
--enable-compat Enable limited v2.x command line syntax --disable-shaper Disable traffic shaping code --disable-ftp Disable FTP redirection support
The GNU Configure & Build system use
/usr/local as the default install
prefix. For most use-cases this is fine, but if you want to change this
/usr use the
--prefix=/usr configure option:
./configure --prefix=/usr make -j5 sudo make install-strip
Building from GIT sources require you have
./autogen.sh to create the configure script.
Origin & References
Redir was originally created by Sam Creasey and is now developed and maintained at GitHub by Joachim Nilsson. Use GitHub to file bug reports, clone, or send pull requests for bug fixes and extensions.
Redir is distributed under the terms of the GNU Public Licence, version 2 or later, distributed with this source archive in the file COPYING.