1FUD(8)                            Cyrus IMAP                            FUD(8)
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NAME

6       fud - Cyrus IMAP documentation
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8       Provide information about user mailboxes
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SYNOPSIS

11       fud [ -C config-file ] [ -U uses ] [ -T timeout ] [ -D ]
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DESCRIPTION

14       fud  is  a long lived datagram daemon started from master that provides
15       information about when a user last read their mail, when mail last  ar‐
16       rived  in  a  user’s mailbox, and how many messages are recent for that
17       user.
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19       fud reads its configuration options out of the imapd.conf(5)  file  un‐
20       less specified otherwise by -C.
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22       fud  will automatically proxy any and all FUD requests to the appropri‐
23       ate backend server if it is running on a Cyrus Murder frontend machine.
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25       To set up the FUD daemon, add this to your cyrus.conf:
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27       fud           cmd="fud" listen="fud" prefork=1 proto="udp"
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29       and to /etc/services:
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31       fud             4201/udp                        # Cyrus IMAP FUD Daemon
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33   Client
34       There is no specific FUD client. This shows how one might access FUD.
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36       #!/usr/bin/perl
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38       use Socket;
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40       print( "Enter fud hostname: " );
41       $hostname = <>;
42       chomp( $hostname );
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44       print( "Enter username to query: " );
45       $username = <>;
46       chomp( $username );
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48       socket( FUD, PF_INET, SOCK_DGRAM, getprotobyname( "udp" ) )
49          or die( "failed to create udp socket: $!" );
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51       $ipaddr = inet_aton( $hostname );
52       $portaddr = sockaddr_in( '4201', $ipaddr );
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54       $fud_query = $username . '|user.' . $username;
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56       send( FUD, "$fud_query", 0, $portaddr ) == length( $fud_query )
57          or die( "failed to send fud query: $!" );
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59       recv( FUD, $fud_response, 512, 0 )
60          or die( "recv() failed: $!" );
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62       print( "FUD responded: $fud_response\n" );
63
64       exit( 0 );
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OPTIONS

67       -C config-file
68              Use the specified configuration file config-file rather than the
69              default imapd.conf(5).
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71       -U uses
72              The  maximum number of times that the process should be used for
73              new connections before shutting down.  The default is 250.
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75       -T timeout
76              The number of seconds that the process will wait for a new  con‐
77              nection  before  shutting  down.   Note that a value of 0 (zero)
78              will disable the timeout.  The default is 60.
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80       -D     Run external debugger specified in debug_command.
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FILES

83       /etc/imapd.conf, /etc/cyrus.conf
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BUGS

86       Though not really a bug, fud will silently ignore any requests that  it
87       does not consider valid.
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89       Also  not  really a bug, fud requires that the anonymous user has the 0
90       (zero) right on the mailbox in question.  This is only a “bug”  because
91       0 is not a standard IMAP ACL bit.
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93       fud  is an experimental interface meant to provide information to build
94       a finger-like service around.  Eventually it should be superseded by  a
95       more standards-based protocol.
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SEE ALSO

98       imapd.conf(5), cyrus.conf(5)
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AUTHOR

101       The Cyrus Team, Nic Bernstein (Onlight)
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104       1993-2018, The Cyrus Team
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1093.4.4                            June 27, 2022                          FUD(8)
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