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.Dd 15/4/2024
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.Dt opentracker 1
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.Os Unix
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.Sh opentracker
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.Nm opentracker
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.Nd a free and open bittorrent tracker
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.Sh SYNOPSIS
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.Nm
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.Op Fl f Ar config
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.Op Fl i Ar ip-select
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.Op Fl p Ar port-bind-tcp
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.Op Fl P Ar port-bind-udp
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.Op Fl A Ar blessed-ip
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.Op Fl r Ar redirect-url
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.Op Fl d Ar chdir
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.Op Fl u Ar user
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.Op Fl w| Fl b accesslist
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.Sh DESCRIPTION
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.Nm
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is a bittorrent tracker that implements announce and scrape actions over the
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UDP and the plain http protocol, aiming for minimal resource usage.
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.Pp
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When invoked with parameters, it binds to TCP and UDP port 6969 on all
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interfaces. The recommended way to configure opentracker is by providing a
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config file using the
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.Op Fl f Ar config
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option. See
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.Xr opentracker.conf 4
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for details.
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.Pp
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.Sh OPTIONS
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The following options are available:
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.Bl -tag -width -indent=8
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.It Fl f Ar config
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Parse a config file with a list of options. Consecutive command options
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will override options from the config file. See
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.Xr opentracker.conf 4
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for details.
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.It Fl i Ar ip-select
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Select an ip address that will be used with the next
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.Op Fl p
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or
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.Op Fl P
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command to actually bind to this address. Setting this option without any bind
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options in the config file or
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.Op Fl p
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or
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.Op Fl P
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commands will limit opentracker to only bind to this address.
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.It Fl p Ar port-bind-tcp
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Bind to the TCP port on the last preceding ip address set with the
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.Op Fl i ip-select
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option or to all available addresses if none has been set. Can be given multiple
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times.
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.It Fl P Ar port-bind-udp
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Bind to the UDP port on the last preceding ip address set with the
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.Op Fl i ip-select
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option or to all available addresses if none has been set. Can be given multiple
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times.
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.It Fl A Ar blessed-ip
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Set an ip address in IPv4 or IPv6 or a net in CIDR notation to bless the network
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for access to restricted resources.
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.It Fl r Ar redirect-url
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Set the URL that
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.Nm
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will redirect users to when the / address is requested via HTTP.
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.It Fl d Ar chdir
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Sets the directory
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.Nm
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will
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.Xr chroot 2
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to if ran as root or
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.Xr chdir 2
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to if ran as unprivileged user. Note that any accesslist files need to be
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relative to and within that directory.
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.It Fl u Ar user
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User to run
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.Nm
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under after all operations that need privileges have finished.
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.It Fl w Ar accesslist | Fl b Ar accesslist
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If
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.Nm
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has been compiled with the
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.B WANT_ACCESSLIST_BLACK
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or
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.Br WANT_ACCESSLIST_WHITE
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options, this option sets the location of the accesslist.
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.El
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.Sh EXAMPLES
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Start
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.Nm
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bound on UDP and TCP ports 6969 on IPv6 localhost.
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.Dl # ./opentracker -i ::1 -p 6969 -P 6969
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.Pp
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Start
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.Nm
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bound on UDP port 6868 and TCP port 6868 on IPv4 localhost and allow
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privileged access from the network 192.168/16 while redirecting
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HTTP clients accessing the root directory, which is not covered by the
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bittorrent tracker protocol, to https://my-trackersite.com/.
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.Dl # ./opentracker -i 192.168.0.4 -p 6868 -P 6969 -A 192.168/16 -r https://my-trackersite.com/
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The announce URLs are http://192.168.0.4:6868/announce and
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udp://192.168.0.4:6868/announce respectively.
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.Sh FILES
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.Bl -tag -width indent
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.It Pa opentracker.conf
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The
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.Nm
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config file.
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.El
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.Sh SEE ALSO
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.Xr opentracker.conf 4
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.Pp
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opentracker documentation
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.Lk https://erdgeist.org/arts/software/opentracker
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.Pp
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Bittorrent tracker protocol
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.Lk http://www.bittorrent.org/beps/bep_0015.html
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.Sh AUTHOR
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.An Dirk Engling
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.Aq Mt erdgeist@erdgeist.org .
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.Sh LICENSE
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This software is released under the Beerware License:
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.Pp
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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and associated documentation files (the "Software"), to deal in the Software with the following
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terms and conditions:
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.Pp
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If you meet the author(s) someday, and you think this software is worth it, you can buy them
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a beer in return.
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