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diff --git a/doc/guix.texi b/doc/guix.texi index 8944f5129d..aba8a6b575 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -14716,6 +14716,7 @@ declaration. * Mail Services:: IMAP, POP3, SMTP, and all that. * Messaging Services:: Messaging services. * Telephony Services:: Telephony services. +* File-Sharing Services:: File-sharing services. * Monitoring Services:: Monitoring services. * Kerberos Services:: Kerberos services. * LDAP Services:: LDAP services. @@ -22287,6 +22288,804 @@ If it is set your server will be linked by this host name instead. +@node File-Sharing Services +@subsection File-Sharing Services + +The @code{(gnu services file-sharing)} module provides services that +assist with transferring files over peer-to-peer file-sharing networks. + +@subsubheading Transmission Daemon Service + +@uref{https://transmissionbt.com/, Transmission} is a flexible +BitTorrent client that offers a variety of graphical and command-line +interfaces. A @code{transmission-daemon-service-type} service provides +Transmission's headless variant, @command{transmission-daemon}, as a +system service, allowing users to share files via BitTorrent even when +they are not logged in. + +@deffn {Scheme Variable} transmission-daemon-service-type +The service type for the Transmission Daemon BitTorrent client. Its +value must be a @code{transmission-daemon-configuration} object as in +this example: + +@lisp +(service transmission-daemon-service-type + (transmission-daemon-configuration + ;; Restrict access to the RPC ("control") interface + (rpc-authentication-required? #t) + (rpc-username "transmission") + (rpc-password + (transmission-password-hash + "transmission" ; desired password + "uKd1uMs9")) ; arbitrary salt value + + ;; Accept requests from this and other hosts on the + ;; local network + (rpc-whitelist-enabled? #t) + (rpc-whitelist '("::1" "127.0.0.1" "192.168.0.*")) + + ;; Limit bandwidth use during work hours + (alt-speed-down (* 1024 2)) ; 2 MB/s + (alt-speed-up 512) ; 512 kB/s + + (alt-speed-time-enabled? #t) + (alt-speed-time-day 'weekdays) + (alt-speed-time-begin + (+ (* 60 8) 30)) ; 8:30 am + (alt-speed-time-end + (+ (* 60 (+ 12 5)) 30)))) ; 5:30 pm +@end lisp +@end deffn + +Once the service is started, users can interact with the daemon through +its Web interface (at @code{http://localhost:9091/}) or by using the +@command{transmission-remote} command-line tool, available in the +@code{transmission} package. (Emacs users may want to also consider the +@code{emacs-transmission} package.) Both communicate with the daemon +through its remote procedure call (RPC) interface, which by default is +available to all users on the system; you may wish to change this by +assigning values to the @code{rpc-authentication-required?}, +@code{rpc-username} and @code{rpc-password} settings, as shown in the +example above and documented further below. + +The value for @code{rpc-password} must be a password hash of the type +generated and used by Transmission clients. This can be copied verbatim +from an existing @file{settings.json} file, if another Transmission +client is already being used. Otherwise, the +@code{transmission-password-hash} and @code{transmission-random-salt} +procedures provided by this module can be used to obtain a suitable hash +value. + +@deffn {Scheme Procedure} transmission-password-hash @var{password} @var{salt} +Returns a string containing the result of hashing @var{password} +together with @var{salt}, in the format recognized by Transmission +clients for their @code{rpc-password} configuration setting. + +@var{salt} must be an eight-character string. The +@code{transmission-random-salt} procedure can be used to generate a +suitable salt value at random. +@end deffn + +@deffn {Scheme Procedure} transmission-random-salt +Returns a string containing a random, eight-character salt value of the +type generated and used by Transmission clients, suitable for passing to +the @code{transmission-password-hash} procedure. +@end deffn + +These procedures are accessible from within a Guile REPL started with +the @command{guix repl} command (@pxref {Invoking guix repl}). This is +useful for obtaining a random salt value to provide as the second +parameter to `transmission-password-hash`, as in this example session: + +@example +$ guix repl +scheme@@(guix-user)> ,use (gnu services file-sharing) +scheme@@(guix-user)> (transmission-random-salt) +$1 = "uKd1uMs9" +@end example + +Alternatively, a complete password hash can generated in a single step: + +@example +scheme@@(guix-user)> (transmission-password-hash "transmission" +(transmission-random-salt)) +$2 = "@{c8bbc6d1740cd8dc819a6e25563b67812c1c19c9VtFPfdsX" +@end example + +The resulting string can be used as-is for the value of +@code{rpc-password}, allowing the password to be kept hidden even in the +operating-system configuration. + +Torrent files downloaded by the daemon are directly accessible only to +users in the ``transmission'' user group, who receive read-only access +to the directory specified by the @code{download-dir} configuration +setting (and also the directory specified by @code{incomplete-dir}, if +@code{incomplete-dir-enabled?} is @code{#t}). Downloaded files can be +moved to another directory or deleted altogether using +@command{transmission-remote} with its @code{--move} and +@code{--remove-and-delete} options. + +If the @code{watch-dir-enabled?} setting is set to @code{#t}, users in +the ``transmission'' group are able also to place @file{.torrent} files +in the directory specified by @code{watch-dir} to have the corresponding +torrents added by the daemon. (The @code{trash-original-torrent-files?} +setting controls whether the daemon deletes these files after processing +them.) + +Some of the daemon's configuration settings can be changed temporarily +by @command{transmission-remote} and similar tools. To undo these +changes, use the service's @code{reload} action to have the daemon +reload its settings from disk: + +@example +# herd reload transmission-daemon +@end example + +The full set of available configuration settings is defined by the +@code{transmission-daemon-configuration} data type. + +@deftp {Data Type} transmission-daemon-configuration +The data type representing configuration settings for Transmission +Daemon. These correspond directly to the settings recognized by +Transmission clients in their @file{settings.json} file. +@end deftp + +@c The following documentation was initially generated by +@c (generate-transmission-daemon-documentation) in (gnu services +@c file-sharing). Manually maintained documentation is better, so we +@c shouldn't hesitate to edit below as needed. However if the change +@c you want to make to this documentation can be done in an automated +@c way, it's probably easier to change (generate-documentation) than to +@c make it below and have to deal with the churn as Transmission Daemon +@c updates. + +@c %start of fragment + +Available @code{transmission-daemon-configuration} fields are: + +@deftypevr {@code{transmission-daemon-configuration} parameter} package transmission +The Transmission package to use. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer stop-wait-period +The period, in seconds, to wait when stopping the service for +@command{transmission-daemon} to exit before killing its process. This +allows the daemon time to complete its housekeeping and send a final +update to trackers as it shuts down. On slow hosts, or hosts with a +slow network connection, this value may need to be increased. + +Defaults to @samp{10}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} string download-dir +The directory to which torrent files are downloaded. + +Defaults to @samp{"/var/lib/transmission-daemon/downloads"}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean incomplete-dir-enabled? +If @code{#t}, files will be held in @code{incomplete-dir} while their +torrent is being downloaded, then moved to @code{download-dir} once the +torrent is complete. Otherwise, files for all torrents (including those +still being downloaded) will be placed in @code{download-dir}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} maybe-string incomplete-dir +The directory in which files from incompletely downloaded torrents will +be held when @code{incomplete-dir-enabled?} is @code{#t}. + +Defaults to @samp{disabled}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} umask umask +The file mode creation mask used for downloaded files. (See the +@command{umask} man page for more information.) + +Defaults to @samp{18}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean rename-partial-files? +When @code{#t}, ``.part'' is appended to the name of partially +downloaded files. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} preallocation-mode preallocation +The mode by which space should be preallocated for downloaded files, one +of @code{none}, @code{fast} (or @code{sparse}) and @code{full}. +Specifying @code{full} will minimize disk fragmentation at a cost to +file-creation speed. + +Defaults to @samp{fast}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean watch-dir-enabled? +If @code{#t}, the directory specified by @code{watch-dir} will be +watched for new @file{.torrent} files and the torrents they describe +added automatically (and the original files removed, if +@code{trash-original-torrent-files?} is @code{#t}). + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} maybe-string watch-dir +The directory to be watched for @file{.torrent} files indicating new +torrents to be added, when @code{watch-dir-enabled} is @code{#t}. + +Defaults to @samp{disabled}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean trash-original-torrent-files? +When @code{#t}, @file{.torrent} files will be deleted from the watch +directory once their torrent has been added (see +@code{watch-directory-enabled?}). + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean speed-limit-down-enabled? +When @code{#t}, the daemon's download speed will be limited to the rate +specified by @code{speed-limit-down}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer speed-limit-down +The default global-maximum download speed, in kilobytes per second. + +Defaults to @samp{100}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean speed-limit-up-enabled? +When @code{#t}, the daemon's upload speed will be limited to the rate +specified by @code{speed-limit-up}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer speed-limit-up +The default global-maximum upload speed, in kilobytes per second. + +Defaults to @samp{100}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean alt-speed-enabled? +When @code{#t}, the alternate speed limits @code{alt-speed-down} and +@code{alt-speed-up} are used (in place of @code{speed-limit-down} and +@code{speed-limit-up}, if they are enabled) to constrain the daemon's +bandwidth usage. This can be scheduled to occur automatically at +certain times during the week; see @code{alt-speed-time-enabled?}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer alt-speed-down +The alternate global-maximum download speed, in kilobytes per second. + +Defaults to @samp{50}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer alt-speed-up +The alternate global-maximum upload speed, in kilobytes per second. + +Defaults to @samp{50}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean alt-speed-time-enabled? +When @code{#t}, the alternate speed limits @code{alt-speed-down} and +@code{alt-speed-up} will be enabled automatically during the periods +specified by @code{alt-speed-time-day}, @code{alt-speed-time-begin} and +@code{alt-time-speed-end}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} day-list alt-speed-time-day +The days of the week on which the alternate-speed schedule should be +used, specified either as a list of days (@code{sunday}, @code{monday}, +and so on) or using one of the symbols @code{weekdays}, @code{weekends} +or @code{all}. + +Defaults to @samp{all}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer alt-speed-time-begin +The time of day at which to enable the alternate speed limits, expressed +as a number of minutes since midnight. + +Defaults to @samp{540}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer alt-speed-time-end +The time of day at which to disable the alternate speed limits, +expressed as a number of minutes since midnight. + +Defaults to @samp{1020}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} string bind-address-ipv4 +The IP address at which to listen for peer connections, or ``0.0.0.0'' +to listen at all available IP addresses. + +Defaults to @samp{"0.0.0.0"}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} string bind-address-ipv6 +The IPv6 address at which to listen for peer connections, or ``::'' to +listen at all available IPv6 addresses. + +Defaults to @samp{"::"}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean peer-port-random-on-start? +If @code{#t}, when the daemon starts it will select a port at random on +which to listen for peer connections, from the range specified +(inclusively) by @code{peer-port-random-low} and +@code{peer-port-random-high}. Otherwise, it listens on the port +specified by @code{peer-port}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} port-number peer-port-random-low +The lowest selectable port number when @code{peer-port-random-on-start?} +is @code{#t}. + +Defaults to @samp{49152}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} port-number peer-port-random-high +The highest selectable port number when @code{peer-port-random-on-start} +is @code{#t}. + +Defaults to @samp{65535}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} port-number peer-port +The port on which to listen for peer connections when +@code{peer-port-random-on-start?} is @code{#f}. + +Defaults to @samp{51413}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean port-forwarding-enabled? +If @code{#t}, the daemon will attempt to configure port-forwarding on an +upstream gateway automatically using @acronym{UPnP} and +@acronym{NAT-PMP}. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} encryption-mode encryption +The encryption preference for peer connections, one of +@code{prefer-unencrypted-connections}, +@code{prefer-encrypted-connections} or +@code{require-encrypted-connections}. + +Defaults to @samp{prefer-encrypted-connections}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} maybe-string peer-congestion-algorithm +The TCP congestion-control algorithm to use for peer connections, +specified using a string recognized by the operating system in calls to +@code{setsockopt} (or set to @code{disabled}, in which case the +operating-system default is used). + +Note that on GNU/Linux systems, the kernel must be configured to allow +processes to use a congestion-control algorithm not in the default set; +otherwise, it will deny these requests with ``Operation not permitted''. +To see which algorithms are available on your system and which are +currently permitted for use, look at the contents of the files +@file{tcp_available_congestion_control} and +@file{tcp_allowed_congestion_control} in the @file{/proc/sys/net/ipv4} +directory. + +As an example, to have Transmission Daemon use +@uref{http://www-ece.rice.edu/networks/TCP-LP/,the TCP Low Priority +congestion-control algorithm}, you'll need to modify your kernel +configuration to build in support for the algorithm, then update your +operating-system configuration to allow its use by adding a +@code{sysctl-service-type} service (or updating the existing one's +configuration) with lines like the following: + +@lisp +(service sysctl-service-type + (sysctl-configuration + (settings + ("net.ipv4.tcp_allowed_congestion_control" . + "reno cubic lp")))) +@end lisp + +The Transmission Daemon configuration can then be updated with + +@lisp +(peer-congestion-algorithm "lp") +@end lisp + +and the system reconfigured to have the changes take effect. + +Defaults to @samp{disabled}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} tcp-type-of-service peer-socket-tos +The type of service to request in outgoing @acronym{TCP} packets, one of +@code{default}, @code{low-cost}, @code{throughput}, @code{low-delay} and +@code{reliability}. + +Defaults to @samp{default}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer peer-limit-global +The global limit on the number of connected peers. + +Defaults to @samp{200}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer peer-limit-per-torrent +The per-torrent limit on the number of connected peers. + +Defaults to @samp{50}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer upload-slots-per-torrent +The maximum number of peers to which the daemon will upload data +simultaneously for each torrent. + +Defaults to @samp{14}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer peer-id-ttl-hours +The maximum lifespan, in hours, of the peer ID associated with each +public torrent before it is regenerated. + +Defaults to @samp{6}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean blocklist-enabled? +When @code{#t}, the daemon will ignore peers mentioned in the blocklist +it has most recently downloaded from @code{blocklist-url}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} maybe-string blocklist-url +The URL of a peer blocklist (in @acronym{P2P}-plaintext or eMule +@file{.dat} format) to be periodically downloaded and applied when +@code{blocklist-enabled?} is @code{#t}. + +Defaults to @samp{disabled}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean download-queue-enabled? +If @code{#t}, the daemon will be limited to downloading at most +@code{download-queue-size} non-stalled torrents simultaneously. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer download-queue-size +The size of the daemon's download queue, which limits the number of +non-stalled torrents it will download at any one time when +@code{download-queue-enabled?} is @code{#t}. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean seed-queue-enabled? +If @code{#t}, the daemon will be limited to seeding at most +@code{seed-queue-size} non-stalled torrents simultaneously. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer seed-queue-size +The size of the daemon's seed queue, which limits the number of +non-stalled torrents it will seed at any one time when +@code{seed-queue-enabled?} is @code{#t}. + +Defaults to @samp{10}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean queue-stalled-enabled? +When @code{#t}, the daemon will consider torrents for which it has not +shared data in the past @code{queue-stalled-minutes} minutes to be +stalled and not count them against its @code{download-queue-size} and +@code{seed-queue-size} limits. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer queue-stalled-minutes +The maximum period, in minutes, a torrent may be idle before it is +considered to be stalled, when @code{queue-stalled-enabled?} is +@code{#t}. + +Defaults to @samp{30}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean ratio-limit-enabled? +When @code{#t}, a torrent being seeded will automatically be paused once +it reaches the ratio specified by @code{ratio-limit}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-rational ratio-limit +The ratio at which a torrent being seeded will be paused, when +@code{ratio-limit-enabled?} is @code{#t}. + +Defaults to @samp{2.0}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean idle-seeding-limit-enabled? +When @code{#t}, a torrent being seeded will automatically be paused once +it has been idle for @code{idle-seeding-limit} minutes. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer idle-seeding-limit +The maximum period, in minutes, a torrent being seeded may be idle +before it is paused, when @code{idle-seeding-limit-enabled?} is +@code{#t}. + +Defaults to @samp{30}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean dht-enabled? +Enable @uref{http://bittorrent.org/beps/bep_0005.html,the distributed +hash table (@acronym{DHT}) protocol}, which supports the use of +trackerless torrents. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean lpd-enabled? +Enable @uref{https://en.wikipedia.org/wiki/Local_Peer_Discovery,local +peer discovery} (@acronym{LPD}), which allows the discovery of peers on +the local network and may reduce the amount of data sent over the public +Internet. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean pex-enabled? +Enable @uref{https://en.wikipedia.org/wiki/Peer_exchange,peer exchange} +(@acronym{PEX}), which reduces the daemon's reliance on external +trackers and may improve its performance. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean utp-enabled? +Enable @uref{http://bittorrent.org/beps/bep_0029.html,the micro +transport protocol} (@acronym{uTP}), which aims to reduce the impact of +BitTorrent traffic on other users of the local network while maintaining +full utilization of the available bandwidth. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean rpc-enabled? +If @code{#t}, enable the remote procedure call (@acronym{RPC}) +interface, which allows remote control of the daemon via its Web +interface, the @command{transmission-remote} command-line client, and +similar tools. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} string rpc-bind-address +The IP address at which to listen for @acronym{RPC} connections, or +``0.0.0.0'' to listen at all available IP addresses. + +Defaults to @samp{"0.0.0.0"}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} port-number rpc-port +The port on which to listen for @acronym{RPC} connections. + +Defaults to @samp{9091}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} string rpc-url +The path prefix to use in the @acronym{RPC}-endpoint @acronym{URL}. + +Defaults to @samp{"/transmission/"}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean rpc-authentication-required? +When @code{#t}, clients must authenticate (see @code{rpc-username} and +@code{rpc-password}) when using the @acronym{RPC} interface. Note this +has the side effect of disabling host-name whitelisting (see +@code{rpc-host-whitelist-enabled?}. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} maybe-string rpc-username +The username required by clients to access the @acronym{RPC} interface +when @code{rpc-authentication-required?} is @code{#t}. + +Defaults to @samp{disabled}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} maybe-transmission-password-hash rpc-password +The password required by clients to access the @acronym{RPC} interface +when @code{rpc-authentication-required?} is @code{#t}. This must be +specified using a password hash in the format recognized by Transmission +clients, either copied from an existing @file{settings.json} file or +generated using the @code{transmission-password-hash} procedure. + +Defaults to @samp{disabled}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean rpc-whitelist-enabled? +When @code{#t}, @acronym{RPC} requests will be accepted only when they +originate from an address specified in @code{rpc-whitelist}. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} string-list rpc-whitelist +The list of IP and IPv6 addresses from which @acronym{RPC} requests will +be accepted when @code{rpc-whitelist-enabled?} is @code{#t}. Wildcards +may be specified using @samp{*}. + +Defaults to @samp{("127.0.0.1" "::1")}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean rpc-host-whitelist-enabled? +When @code{#t}, @acronym{RPC} requests will be accepted only when they +are addressed to a host named in @code{rpc-host-whitelist}. Note that +requests to ``localhost'' or ``localhost.'', or to a numeric address, +are always accepted regardless of these settings. + +Note also this functionality is disabled when +@code{rpc-authentication-required?} is @code{#t}. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} string-list rpc-host-whitelist +The list of host names recognized by the @acronym{RPC} server when +@code{rpc-host-whitelist-enabled?} is @code{#t}. + +Defaults to @samp{()}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} message-level message-level +The minimum severity level of messages to be logged (to +@file{/var/log/transmission.log}) by the daemon, one of @code{none} (no +logging), @code{error}, @code{info} and @code{debug}. + +Defaults to @samp{info}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean start-added-torrents? +When @code{#t}, torrents are started as soon as they are added; +otherwise, they are added in ``paused'' state. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean script-torrent-done-enabled? +When @code{#t}, the script specified by +@code{script-torrent-done-filename} will be invoked each time a torrent +completes. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} maybe-file-object script-torrent-done-filename +A file name or file-like object specifying a script to run each time a +torrent completes, when @code{script-torrent-done-enabled?} is +@code{#t}. + +Defaults to @samp{disabled}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean scrape-paused-torrents-enabled? +When @code{#t}, the daemon will scrape trackers for a torrent even when +the torrent is paused. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} non-negative-integer cache-size-mb +The amount of memory, in megabytes, to allocate for the daemon's +in-memory cache. A larger value may increase performance by reducing +the frequency of disk I/O. + +Defaults to @samp{4}. + +@end deftypevr + +@deftypevr {@code{transmission-daemon-configuration} parameter} boolean prefetch-enabled? +When @code{#t}, the daemon will try to improve I/O performance by +hinting to the operating system which data is likely to be read next +from disk to satisfy requests from peers. + +Defaults to @samp{#t}. + +@end deftypevr + + +@c %end of fragment + + + @node Monitoring Services @subsection Monitoring Services |