Transmission (BitTorrent client)

BitTorrent client

This article needs to be updated. The reason given is: Transmission 4.0.0 introduced massive major changes, this article is now very out of date.. Please help update this article to reflect recent events or newly available information. (February 2024)

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Transmission

Transmission 4.0.5 with an active download

Original author(s)| Eric Petit, Josh Elsasser, Bryan Varner
Developer(s)| Mike Gelfand (Windows), Charles Kerr (aka Jordan Lee), Mitchell Livingston
Initial release| 15 September 2005; 19 years ago (2005-09-15)[1][2]
Stable release|

4.0.6[3] / 30 May 2024; 14 months ago (30 May 2024)

Repository|

* github.com/transmission/transmission

Written in| C++, Objective-C++
Operating system| Unix-like, macOS, Microsoft Windows[4]
Type| BitTorrent client
License| GPL-2.0-only or GPL-3.0-only[a][b], MIT[5]
Website| transmissionbt.com

Transmission is a BitTorrent client which features a variety of user interfaces on top of a cross-platform back-end. Transmission is free software licensed under the terms of the GNU General Public License, with parts under the MIT License.[6]

## Features

[edit]

Transmission allows users to quickly download files from multiple peers on the Internet and to upload their own files.[7] By adding torrent files via the user interface, users can create a queue of files to be downloaded and uploaded. Within the file selection menus, users can customise their downloads at the level of individual files. Transmission also seeds, that is, it will automatically share downloaded content.[8]

Transmission allows the assigning of priorities to torrents and to files within torrents, thus potentially influencing which files download first. It supports the Magnet URI scheme[9] and encrypted connections. It allows torrent-file creation and peer exchange compatible with Vuze and μTorrent. It includes a built-in web server so that users can control Transmission remotely via the web.[10] It also supports automatic port-mapping using UPnP/NAT-PMP, peer caching, blocklists for bad peers, bandwidth limits dependent on time-of-day, globally or per-torrent, and has partial support for IPv6.[11] It allows the use of multiple trackers simultaneously,[12] Local Peer Discovery,[13] Micro Transport Protocol (μTP),[14] and UDP tracker.[15] It does not support directly subscribing to RSS feeds containing torrent files for automatic download, but third-party add-ons can supply this functionality.[10]: 229

macOS-specific features include Dock and Growl notifications, automatic updates using Sparkle and Universal Binary (up until version 2.22).

Transmission 4.0.0, released in February 2023, added support for hybrid torrents so that it can work with v1 and hybrid (v1/v2) torrents.[16]

## Development

[edit]

Transmission's torrent activity and settings window.

Transmission 1.60 and later removed support for Mac OS X v10.4. Currently, Transmission 1.54 is the last version that runs on Mac OS X 10.4. Although it is possible to compile later versions from source, either by downloading from the project's website[17] or using a package manager like Fink or MacPorts, it is unsupported and any bugs specific to 10.4 will not be fixed. Starting with Transmission 2.30[18] an Apple Mac with an Intel CPU is needed; PowerPC-based systems are no longer supported natively. Since Transmission 4.0, Apple Silicon is supported as well.[19]

The Transmission back-end (libTransmission) also serves as the basis of the Transmission daemon. The daemon supports a web front-end called Clutch. Older versions have been ported to form the basis of the update system for the video game Metal Gear Online on PlayStation 3,[20][21] as well as the backend for ImageShack's BitTorrent service.

## Distribution and ports

[edit]

A portable version is available on PortableApps.com.[22]

### Ports

[edit]

Transmission is a set of lightweight BitTorrent clients (in GUI, CLI and daemon form). All its incarnations feature a very simple, intuitive interface on top on an efficient, cross-platform back-end.

There are several transmission clients for different operating systems including Unix-like, macOS and BeOS/ZETA. Each operating system front-end is built using native widget toolkits.[6] For example, transmission-gtk uses the GTK interface, transmission-qt the Qt interface, and transmission-cli a command-line interface. Transmission-remote-cli is an ncurses interface for the transmission-daemon. Python-transmissionrpc is a Python module implementing the JSON-RPC protocol for Transmission.

An unofficial port of Transmission using a command-line interface (CLI) on iOS was accomplished on 3 March 2008.[23] In November 2010, iTransmission, another unofficial port, was released for jailbroken iPhones sporting a GUI that is capable of downloading directly to the device over WiFi or 3G.[24] A Transmission remote was released for Android, with the name of Transdroid but does not currently support downloading directly to devices.[25]

On Windows, Transmission-Qt can be built with MinGW,[26] the daemon and console tools can be built with Cygwin,[27] also there are two third-party GUIs: transmission-remote-dotnet[28] and Transmission Remote GUI,[29] as well as unofficial full builds of Transmission's Qt Client.[30][31] There is also an unofficial full build of Transmission daemon which can be run as a Windows service.[32] This same unofficial full build of Transmission daemon running as a Windows service can be used for direct streaming of the downloading file(s).[33]

A port for all platforms enhanced with streaming of the downloading file(s) is located on GitHub.[34]

It is also ported to the Maemo OS of the Nokia N810 internet tablet and N900 smartphone as well as to the MeeGo/Harmattan OS of the Nokia N9 and N950 smartphones, on which it does download the torrents to the device.

### Website breach

[edit]

In March 2016, Palo Alto Networks reported that Transmission's official website was compromised and tainted .dmg files were uploaded to the site, using an Apple Developer signature to bypass the OS X gatekeeper feature.[35][36][37]

The tainted packages installed a ransomware application (a variant of Linux.Encoder.1, but recompiled for Mac, known as KeRanger) that encrypts the user's files and attempts to force users to pay 1 Bitcoin (worth roughly US$404 at the time of the attack) in order to get the decryption pack. The Transmission website advised Mac users to immediately upgrade to a new version that removes the malware-infected file. Apple revoked the developer certificate that was used to sign the tainted package, and added the package's signature to the XProtect anti-malware system.

## Reception

[edit]

Transmission is the default BitTorrent client of many Unix and Linux distributions,[38] including Ubuntu,[39] Mint,[40] Fedora,[41] Puppy,[42] Zenwalk,[43] and the GNOME flavor of openSUSE.[44]

Fon ships its routers with Transmission pre-installed.[45]

CNET editor Paul Huges praised Transmission for its "simplicity, lightweight, as well as being feature-packed" and as of April 2017 the software ranked third in P2P downloads for Mac on CNET.[46][47]

## See also

[edit]

* Free and open-source software portal

* Comparison of BitTorrent clients
* File sharing

## Notes

[edit]

1. ^ GPL-2.0-only or GPL-3.0-only or any future license endorsed by Mnemosyne LLC.
2. ^ With OpenSSL exception.

## References

[edit]

1. ^ "MovedToGitHub/Changes – Transmission". trac.transmissionbt.com. Archived from the original on 28 November 2018. Retrieved 25 February 2017.
2. ^ "transmission: Official Transmission BitTorrent client repository". 4 December 2017. Archived from the original on 18 October 2016. Retrieved 25 February 2017 - via GitHub.
3. ^ "4.0.6". 30 May 2024. Retrieved 31 May 2024.
4. ^ Transmission-Qt for Windows | A Fast & Easy BitTorrent Client. Trqtw.sourceforge.net. Retrieved on 9 December 2013.
5. ^ COPYING in trunk – Transmission Archived 28 November 2018 at the Wayback Machine. Trac.transmissionbt.com. Retrieved on 9 December 2013.
6. ^ a b Transmission – About, www.transmissionbt.com, 2009, archived from the original on 7 July 2009, retrieved 4 July 2009
7. ^ Richard Petersen (2 July 2014). Beginning Fedora Desktop: Fedora 20 Edition. Apress. pp. 209–. ISBN 978-1-4842-0067-4. Archived from the original on 17 January 2023. Retrieved 1 November 2016.
8. ^ Richard Petersen (2011). Red Hat Enterprise Linux 6: Desktop and Administration. Surfing Turtle Press. pp. 246–. ISBN 978-1-936280-25-4. Archived from the original on 17 January 2023. Retrieved 1 November 2016.
9. ^ Magnet links, extension for peers to send metadata files, Trac.transmissionbt.com, archived from the original on 5 August 2017, retrieved 24 August 2012
10. ^ a b Scott Granneman (18 October 2010). Mac OS X Snow Leopard for Power Users. Apress. pp. 237–. ISBN 978-1-4302-3031-1. Archived from the original on 17 January 2023. Retrieved 1 November 2016.
11. ^ IPv6 does not work against dual-stacked trackers, Trac.transmissionbt.com, archived from the original on 5 August 2017, retrieved 24 August 2012
12. ^ Adding lists of trackers to torrents, Trac.transmissionbt.com, archived from the original on 5 August 2017, retrieved 24 August 2012
13. ^ Local Peer Discovery protocol implementation, Trac.transmissionbt.com, archived from the original on 5 August 2017, retrieved 24 August 2012
14. ^ Add uTP support, Trac.transmissionbt.com, archived from the original on 13 July 2019, retrieved 24 August 2012
15. ^ UDP tracker protocol support, Trac.transmissionbt.com, 12 February 2011, archived from the original on 5 August 2017, retrieved 24 August 2012
16. ^ "Support for Bittorrent v2 (bep 0052) · Issue #458 · transmission/transmission". GitHub. Retrieved 30 April 2025.
17. ^ "Building – Transmission". trac.transmissionbt.com. Archived from the original on 31 August 2011. Retrieved 4 May 2011.
18. ^ "Transmission ChangeLog". Archived from the original on 24 May 2015. Retrieved 19 May 2011.
19. ^ "Transmission 4.0.0-beta.1". GitHub. Retrieved 11 May 2023.
20. ^ [1][dead link]
21. ^ "P2P Communication Technology: BitTorrent Large-capacity Data Distribution" (PDF). Archived from the original (PDF) on 5 March 2012. Retrieved 31 July 2021.
22. ^ "Transmission-Qt Portable". PortableApps.com - Portable software for USB, portable and cloud drives. Archived from the original on 2 December 2014. Retrieved 29 November 2014.
23. ^ "Torrent | CoreOS - iPhoneUnix". Archived from the original on 8 March 2008. Retrieved 6 April 2008.
24. ^ iTransmission, a native BitTorrent client on iOS, github.com, archived from the original on 29 January 2016, retrieved 27 July 2016
25. ^ "Readme - About". Transdroid. GitHub.com. Archived from the original on 17 January 2023. Retrieved 14 July 2018.
26. ^ Building TransmissionQt in Windows, Trac.transmissionbt.com, archived from the original on 14 August 2012, retrieved 24 August 2012
27. ^ Building, Trac.transmissionbt.com, archived from the original on 14 May 2012, retrieved 24 August 2012
28. ^ A µTorrent like Windows remote control for the Transmission client, archived from the original on 8 August 2012, retrieved 24 August 2012
29. ^ Cross platform remote GUI for the Transmission daemon, github.com, archived from the original on 27 July 2016, retrieved 27 July 2016
30. ^ Transmission 1.76 Windows, Sb-innovation.de, archived from the original on 19 July 2011, retrieved 24 August 2012
31. ^ Transmission-Qt, Sourceforge.net, archived from the original on 25 August 2012, retrieved 24 August 2012
32. ^ transmission-daemon-cygwin, Sourceforge.net, archived from the original on 2 February 2014, retrieved 27 January 2014
33. ^ Streaming - The Simplified HOW TO, Sourceforge.net, archived from the original on 10 December 2015, retrieved 27 April 2016
34. ^ cfpp2p/transmission: Up to date Fork of the Transmission BitTorrent client, github.com, archived from the original on 16 April 2018, retrieved 27 April 2016
35. ^ Clark/Nikdel/Powell (6 March 2016). "New OS X Ransomware KeRanger Infected Transmission BitTorrent Client Installer". Palo Alto Networks Blog. Archived from the original on 7 March 2016. Retrieved 7 March 2016.
36. ^ Jim Finkle (7 March 2016). "Apple users targeted in first known Mac ransomware campaign". Reuters. Archived from the original on 1 July 2017. Retrieved 2 July 2017.
37. ^ "Apple Macs targeted by KeRanger ransomware for first time". the Guardian. 7 March 2016. Archived from the original on 7 March 2016. Retrieved 8 March 2016.
38. ^ Mike McGrath (10 June 2010). Linux in easy steps, 5th edition. In Easy Steps. pp. 85–. GGKEY:EE005NUYU77. Archived from the original on 17 January 2023. Retrieved 1 November 2016.
39. ^ Pitt, Martin (14 January 2008), Ubuntu Changelog, archived from the original on 13 August 2011, retrieved 15 May 2008
40. ^ Elyssa Release Notes, archived from the original on 31 July 2015, retrieved 23 August 2009
41. ^ Distribution/Download/BitTorrent, archived from the original on 4 August 2019, retrieved 19 August 2009
42. ^ Puppy Linux 4.2 Release Notes, archived from the original on 19 July 2009
43. ^ Zenwalk Package List, archived from the original on 3 March 2016, retrieved 20 March 2021
44. ^ Make Transmission the default BitTorrent client in 11.2, archived from the original on 13 January 2016, retrieved 19 August 2009
45. ^ FON Starts Selling Fonera 2.0n Router with Transmission, archived from the original on 20 January 2015, retrieved 9 December 2009
46. ^ "Transmission for Mac", download.cnet.com, archived from the original on 12 May 2017, retrieved 12 April 2017
47. ^ "P2P & File-Sharing Software for Mac". download.cnet.com. Archived from the original on 12 April 2017. Retrieved 11 April 2017.

## External links

[edit]

Wikimedia Commons has media related to Transmission (BitTorrent).

* Official website

* v
* t
* e

BitTorrent

Companies|

* Rainberry, Inc.
* Vuze, Inc.

People|

* Bram Cohen
* Ross Cohen
* Eric Klinker
* Ashwin Navin

Technology|

* Glossary
* Broadcatching
* Distributed hash tables
* DNA
* I2P
* index
* Local Peer Discovery
* Peer exchange
* Retracker
* Protocol encryption
* Super-seeding
* Tracker
* Torrent file
* TCP
* UDP
* µTP
* WebRTC
* WebTorrent

Clients
(comparison,
usage share)|

* BitTorrent (original client)
* BitComet
* BiglyBT
* BitLord
* Deluge
* Free Download Manager
* FlashGet
* FrostWire
* GetRight
* Go!Zilla
* KTorrent
* libtorrent (library)
* LimeWire
* µTorrent
* Miro
* MLDonkey
* qBittorrent
* rTorrent
* Shareaza
* Tixati
* Transmission
* Tribler
* Vuze (formerly Azureus)
* WebTorrent Desktop
* Xunlei

Tracker software
(comparison)|

* OpenBitTorrent
* opentracker
* PeerTracker

Search engines
(comparison)|

* 1337x
* BTDigg
* Demonoid
* etree
* Nyaa Torrents
* TamilRockers
* The Pirate Bay
* ruTracker.org
* YggTorrent
* YourBittorrent

Defunct sites
(comparison)|

* BTJunkie
* ExtraTorrent
* EZTV
* isoHunt
* KickassTorrents
* LokiTorrent
* Mininova
* Oink's Pink Palace
* RARBG
* Suprnova.org
* t411
* Torrent Project
* TorrentSpy
* Torrentz
* What.CD
* YIFY
* YouTorrent

Related topics|

* aXXo
* BitTorrent Open Source License
* Glossary of BitTorrent terms
* Popcorn Time
* Slyck.com
* TorrentFreak

* Category
* Commons

* v
* t
* e

Peer-to-peer file sharing

Networks,
protocols|

| Centralized|

* Direct Connect
* Soribada
* Soulseek
* XDCC

|

Decentralized|

* BitTorrent
* DAT
* eDonkey
* FastTrack
* Fopnu
* Hyphanet
* GNUnet
* Gnutella
* Gnutella2
* I2P
* IPFS
* Kad
* LBRY
* OpenFT
* OnionShare
* Perfect Dark
* Retroshare
* Share
* Tribler
* WebTorrent
* WinMX
* Winny
* ZeroNet

Historic|

* Audiogalaxy
* CuteMX
* Hotline
* Kazaa
* LimeWire
* Morpheus
* Napster
* Scour
* Usenet
* WASTE

Comparisons
of clients|

* Advanced Direct Connect
* BitTorrent
* Direct Connect
* eDonkey
* Gnutella
* Gnutella2
* WebTorrent

Hyperlinks|

* eD2k
* Magnet
* Metalink

Uses|

* Backup
* Broadcatching
* Disk sharing
* Game and video sharing
* Image sharing
* Music sharing
* Peercasting
* Seedboxes
* Sharing software
* Web hosting (Freesite, IPFS, ZeroNet)
* Legal aspects

Concepts|

| Privacy|

* Anonymous P2P
* Darknet
* Darkweb
* Friend-to-friend
* Open music model
* Private P2P
* Tor

|

Internal
technologies|

* Distributed hash table
* Merkle tree
* NAT traversal
* Peer exchange
* BitTorrent protocol encryption
* SHA-1
* SHA-2
* Super-seeding
* BitTorrent tracker
* UDP hole punching
* Micro Transport Protocol

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