NAME

       fud - Cyrus IMAP documentation

       Provide information about user mailboxes

SYNOPSIS

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

DESCRIPTION

       fud  is a long lived datagram daemon started from master that provides information about when a user last
       read their mail, when mail last arrived in a user's mailbox, and how many messages are  recent  for  that
       user.

       fud reads its configuration options out of the imapd.conf(5) file unless specified otherwise by -C.

       fud  will automatically proxy any and all FUD requests to the appropriate backend server if it is running
       on a Cyrus Murder frontend machine.

       To set up the FUD daemon, add this to your cyrus.conf:

       fud           cmd="fud" listen="fud" prefork=1 proto="udp"

       and to /etc/services:

       fud             4201/udp                        # Cyrus IMAP FUD Daemon

   Client
       There is no specific FUD client. This shows how one might access FUD.

          #!/usr/bin/perl

          use Socket;

          print( "Enter fud hostname: " );
          $hostname = <>;
          chomp( $hostname );

          print( "Enter username to query: " );
          $username = <>;
          chomp( $username );

          socket( FUD, PF_INET, SOCK_DGRAM, getprotobyname( "udp" ) )
             or die( "failed to create udp socket: $!" );

          $ipaddr = inet_aton( $hostname );
          $portaddr = sockaddr_in( '4201', $ipaddr );

          $fud_query = $username . '|user.' . $username;

          send( FUD, "$fud_query", 0, $portaddr ) == length( $fud_query )
             or die( "failed to send fud query: $!" );

          recv( FUD, $fud_response, 512, 0 )
             or die( "recv() failed: $!" );

          print( "FUD responded: $fud_response\n" );

          exit( 0 );

OPTIONS

       -C config-file
              Use the specified configuration file config-file rather than the default imapd.conf(5).

       -U uses
              The maximum number of times that the process should be used for new  connections  before  shutting
              down.  The default is 250.

       -T timeout
              The  number of seconds that the process will wait for a new connection before shutting down.  Note
              that a value of 0 (zero) will disable the timeout.  The default is 60.

       -D     Run external debugger specified in debug_command.

FILES

       /etc/imapd.conf, /etc/cyrus.conf

BUGS

       Though not really a bug, fud will silently ignore any requests that it does not consider valid.

       Also not really a bug, fud requires that the anonymous user has the 0 (zero)  right  on  the  mailbox  in
       question.  This is only a "bug" because 0 is not a standard IMAP ACL bit.

       fud  is  an  experimental  interface  meant to provide information to build a finger-like service around.
       Eventually it should be superseded by a more standards-based protocol.

SEE ALSO

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

AUTHOR

       The Cyrus Team, Nic Bernstein (Onlight)

COPYRIGHT

       1993–2024, The Cyrus Team

3.8.2                                             Mar 13, 2024                                            FUD(8)