REDIR(1) (smm)
REDIR(1) General Commands Manual (smm) REDIR(1)

redirect TCP connections

redir [
] [
-b IP
] [
] [
] [
] [
-m BPS
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-o <1,2,3>
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-t SEC
] [
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] [

redir redirects TCP connections coming in on a local port, called the client [SRC]:PORT, to a specified address/port combination, called the server [DST]:PORT. Both the SRC and DST arguments can be left out, redir will then use
redir can be run either from inetd or as a standalone daemon. In --inetd mode the listening SRC:PORT combo is handled by another process, usually inetd, and a connected socket is handed over to redir via stdin. Hence only [DST]:PORT is required in --inetd mode. In standalone mode redir can run either in the foreground, -n, or in the background, detached like a proper UNIX daemon. This is the default. When running in the foreground log messages are also printed to stderr, unless the -s flag is given.
Depending on how redir was compiled, not all options may be available.

Mandatory arguments to long options are mandatory for short options too.
Forces redir to pick a specific address to bind to when it listens for connections from the server side. I.e., filtering the interface and address used for the proxied reply from the server back to the client.
One mental model is to consider redir as sitting on the the border of the Internet and a LAN. Clients connect from the Internet side, this option tells redir which interface (address) on the LAN side to listen for replies from the server side (DST:PORT).
Not applicable when running in Linux's transparent proxy mode, -p.
Show built-in help text.
When using redir for an FTP server, this will cause redir to also redirect FTP connections. Type should be specified as either "port", "pasv", or "both", to specify what type of FTP connection to handle. Note that --transproxy often makes one or the other (generally port) undesirable.
Run as a process started from inetd(1), with the connection passed as stdin and stdout on startup.
Specify program identity (name) to be used for TCP wrapper checks and syslog messages.
Set log level: none, err, notice, info, debug. Default is notice.
Run in foreground, do not detach from controlling terminal.
On a Linux system with transparent proxying enabled, causes redir to make connections appear as if they had come from their true origin. See the file transproxy.txt in the distribution, and the Linux Documentation/networking/tproxy.txt for details. Untested on modern Linux kernels.
Log messages to syslog. Default, except when -n is enabled.
Timeout and close the connection after SEC seconds of inactivity.
Show program version.
Redirects connections through an HTTP proxy which supports the CONNECT command. Specify the address and port of the proxy using [DST]:PORT. --connect requires the hostname and port which the HTTP proxy will be asked to connect to.

The following options control traffic shaping, if redir is built with shaping enabled.
Reduce the bandwidth to be no more than BPS bits/sec. The algorithm is basic, the goal is to simulate a slow connection, so there is no peak acceptance.
Apply --max-bandwidth and --random-wait for input(1), output(2), or both(3).
Wait between 0 and 2 x n milliseconds before each "packet". A "packet" is a block of data read in one time by redir. A "packet" size is always less than the bufsize (see also --bufsize)
Set the bufsize (default 4096) in bytes. Can be used combined with --max-bandwidth or --random-wait to simulate a slow connection.

Command line syntax changed in v3.0. Compatibility with v2.x can be enabled using the --enable-compat configure option. This enables the following options: --laddr=ADDR --lport=PORT --caddr=ADDR --cport=PORT which in v3.0 were been replaced with [SRC]:PORT and [DST]:PORT.
For full compatibility, using any of these options will implicitly also enable -n. There is currently no way to tell redir to background itself in this mode of operation.

inetd(1) uredir(1)

redir was made by Nigel Metheringham and Sam Creasey, with contributions from many others. Currently maintained at GitHub by Joachim Wiberg.
01 May, 2016 Debian