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tcpproxy(8)
===========
NAME
----
tcpproxy - IPv4/IPv6 tcp connection proxy
SYNOPSIS
--------
....
tcpproxy
[ -h|--help ]
[ -D|--nodaemonize ]
[ -u|--username <username> ]
[ -g|--groupname <groupname> ]
[ -C|--chroot <path> ]
[ -P|--write-pid <filename> ]
[ -L|--log <target>:<level>[,<param1>[,<param2>[..]]] ]
[ -U|--debug ]
[ -l|--local-addr <host> ]
[ -t|--local-resolv (ipv4|4|ipv6|6) ]
[ -p|--local-port <service> ]
[ -r|--remote-addr <host> ]
[ -R|--remote-resolv (ipv4|4|ipv6|6) ]
[ -o|--remote-port <service> ]
[ -s|--source-addr <host> ]
[ -b|--buffer-size <size> ]
[ -c|--config <file> ]
....
DESCRIPTION
-----------
*tcpproxy* is a simple tcp connection proxy which combines the
features of rinetd and 6tunnel. *tcpproxy* supports IPv4 and
IPv6 and also supports connections from IPv6 to IPv4 endpoints
and vice versa.
OPTIONS
-------
The following options can be passed to the *tcpproxy* daemon:
*-D, --nodaemonize*::
This option instructs *tcpproxy* to run in foreground
instead of becoming a daemon which is the default.
*-u, --username <username>*::
run as this user. If no group is specified (*-g*) the default group of
the user is used. The default is to not drop privileges.
*-g, --groupname <groupname>*::
run as this group. If no username is specified (*-u*) this gets ignored.
The default is to not drop privileges.
*-C, --chroot <path>*::
Instruct *tcpproxy* to run in a chroot jail. The default is
to not run in chroot.
*-P, --write-pid <filename>*::
Instruct *tcpproxy* to write it's pid to this file. The default is
to not create a pid file.
*-L, --log <target>:<level>[,<param1>[,<param2>[..]]]*::
add log target to logging system. This can be invoked several times
in order to log to different targets at the same time. Every target
has its own log level which is a number between 0 and 5. Where 0 means
disabling log and 5 means debug messages are enabled. +
The file target can be used more than once with different levels.
If no target is provided at the command line a single target with the
config *syslog:3,tcpproxy,daemon* is added. +
The following targets are supported:
*syslog*;; log to syslog daemon, parameters <level>[,<logname>[,<facility>]]
*file*;; log to file, parameters <level>[,<path>]
*stdout*;; log to standard output, parameters <level>
*stderr*;; log to standard error, parameters <level>
*-U, --debug*::
This option instructs *tcpproxy* to run in debug mode. It implicits *-D*
(don't daemonize) and adds a log target with the configuration
*stdout:5* (logging with maximum level). In future releases there might
be additional output when this option is supplied.
*-l, --local-addr <host>*::
The local address to bind to. By default *tcpproxy* will listen on any interface
(IPv6 and IPv4).
*-t|--local-resolv (ipv4|4|ipv6|6)*::
When resolving the local address (see above) use only IPv4 or IPv6. The default is
to resolv both.
*-p, --local-port <service>*::
The local port to bind to. By default there is no port defined in which case
*tcpproxy* will try to read the configuration file.
*-r, --remote-addr <host>*::
The remote address to connect to. Unless the configuration file should be used this
must be set to a valid address or hostname.
*-R|--remote-resolv (ipv4|4|ipv6|6)*::
When resolving the remote address (see above) use only IPv4 or IPv6. The default is
to resolv both. Mind that this also effects resolving of the source address (see below)
as the remote and source addresses must be of the same protocol familiy.
*-o, --remote-port <service>*::
The remote port to connect to. Unless the configuration file should be used this
must be set to a valid port or servicename.
*-s, --source-addr <host>*::
Instruct tcpproxy to use this source address for connections to *-R|--remote-address*.
By default *tcpproxy* uses the default source address for the defined remote host.
*-b, --buffer-size <size>*::
The size of the transmit buffers to use. *tcpproxy* will allocate two buffers of this
size for any client which is connected. By default a value of 10Kbytes is used.
*-c, --config <file>*::
The path to the configuration file to be used. This is only evaluated if the local port
is omitted.
CONFIGURATION FILE
------------------
If the configuratin file is used it should contain one or more of the following stanzas:
....
listen (*|address|hostname) (port-number|service-name)
{
resolv: (ipv4|ipv6)
remote: (address|hostname) (port-number|service-name);
remote-resolv: (ipv4|ipv6);
source: (address|hostname);
};
....
Everything between the curly brackets except for the *remote* parameter may be omitted.
SIGNALS
-------
After receiving the HUP signal *tcpproxy* tries to reload the configuration file. It only
reopens a listen socket if the local address and or port has changed. Therefore reloading the
configuration after the daemon has dropped privileges is safe as long as there are no changes
in the local address and port. However this is only of concern if any of the listen ports is
a privileged port (<1024). If there is a syntax error at the configuration file all changes
are discarded.
On SIGUSR1 *tcpproxy* prints some information about the listening sockets and after SIGUSR2
information about open client connections is printed. This is sent to all configured log
targets at a level of 3.
BUGS
----
Most likely there are some bugs in *tcpproxy*. If you find a bug, please let
the developers know at tcpproxy@spreadspace.org. Of course, patches are preferred.
SEE ALSO
--------
rinetd(8)
AUTHORS
-------
Christian Pointner <equinox@spreadspace.org>
RESOURCES
---------
Main web site: http://www.spreadspace.org/tcpproxy/
COPYING
-------
Copyright \(C) 2010-2013 Christian Pointner. This program is free
software: you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or any later version.
|
