219 lines
12 KiB
ReStructuredText
Executable File
219 lines
12 KiB
ReStructuredText
Executable File
=========================================
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Bittorrent udp-tracker protocol extension
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=========================================
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A tracker with the protocol "udp://" in its URI
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is supposed to be contacted using this protocol.
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This protocol is supported by
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xbt-tracker_.
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.. _xbt-tracker: http://xbtt.sourceforge.net
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For additional information and descritptions of
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the terminology used in this document, see
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the `protocol specification`__
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__ http://wiki.theory.org/index.php/BitTorrentSpecification
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All values are sent in network byte order (big endian). The sizes
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are specified with ANSI-C standard types.
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If no response to a request is received within 15 seconds, resend
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the request. If no reply has been received after 60 seconds, stop
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retrying.
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connecting
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----------
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Client sends packet:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int64_t | connection_id | Not used, ignored by tracker. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | action | 0 for a connection request |
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+-------------+---------------------+----------------------------------------+
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| int32_t | transaction_id | Randomized by client. |
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+-------------+---------------------+----------------------------------------+
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Server replies with packet:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int32_t | action | Describes the type of packet, in this |
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| | | case it should be 0, for connect. |
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| | | If 3 (for error) see errors_. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | transaction_id | Must match the transaction_id sent |
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| | | from the client. |
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+-------------+---------------------+----------------------------------------+
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| int64_t | connection_id | A connection id, this is used when |
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| | | further information is exchanged with |
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| | | the tracker, to identify you. |
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| | | This connection id can be reused for |
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| | | multiple requests, but if it's cached |
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| | | for too long, it will not be valid |
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| | | anymore. |
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+-------------+---------------------+----------------------------------------+
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announcing
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----------
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Client sends packet:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int64_t | connection_id | The connection id acquired from |
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| | | establishing the connection. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | action | Action. in this case, 1 for announce. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | transaction_id | Randomized by client. |
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+-------------+---------------------+----------------------------------------+
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| int8_t[20] | info_hash | The info-hash of the torrent you want |
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| | | announce yourself in. |
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+-------------+---------------------+----------------------------------------+
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| int8_t[20] | peer_id | Your peer id. |
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+-------------+---------------------+----------------------------------------+
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| int64_t | downloaded | The number of byte you've downloaded |
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| | | in this session. |
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+-------------+---------------------+----------------------------------------+
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| int64_t | left | The number of bytes you have left to |
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| | | download until you're finished. |
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+-------------+---------------------+----------------------------------------+
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| int64_t | uploaded | The number of bytes you have uploaded |
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| | | in this session. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | event | The event, one of |
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| | | |
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| | | * none = 0 |
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| | | * completed = 1 |
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| | | * started = 2 |
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| | | * stopped = 3 |
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+-------------+---------------------+----------------------------------------+
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| uint32_t | ip | Your ip address. Set to 0 if you want |
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| | | the tracker to use the ``sender`` of |
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| | | this udp packet. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | num_want | The maximum number of peers you want |
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| | | in the reply. Use -1 for default. |
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+-------------+---------------------+----------------------------------------+
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| uint16_t | port | The port you're listening on. |
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+-------------+---------------------+----------------------------------------+
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Server replies with packet:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int32_t | action | The action this is a reply to. Should |
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| | | in this case be 1 for announce. |
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| | | If 3 (for error) see errors_. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | transaction_id | Must match the transaction_id sent |
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| | | in the announce request. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | interval | the number of seconds you should wait |
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| | | until reannouncing yourself. |
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+-------------+---------------------+----------------------------------------+
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The rest of the server reply is a variable number of the following structure:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int32_t | ip | The ip of a peer in the swarm. |
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+-------------+---------------------+----------------------------------------+
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| uint16_t | port | The peer's listen port. |
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+-------------+---------------------+----------------------------------------+
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scraping
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--------
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Client sends packet:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int64_t | connection_id | The connection id retreived from the |
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| | | establishing of the connection. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | action | The action, in this case, 2 for |
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| | | scrape. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | transaction_id | Randomized by client. |
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+-------------+---------------------+----------------------------------------+
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| int8_t[20] | info_hash | The info hash that is to be scraped. |
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+-------------+---------------------+----------------------------------------+
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Server replies with packet:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int32_t | action | The action, should in this case be |
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| | | 2 for scrape. |
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| | | If 3 (for error) see errors_. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | transaction_id | Must match the sent transaction id. |
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+-------------+---------------------+----------------------------------------+
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The rest of the packet contains a variable number of the following structures:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int8_t[20] | info_hash | The info hash of this info. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | complete | The total number of completed |
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| | | downloads. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | downloaded | The current number of connected seeds. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | incomplete | The current number of connected |
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| | | leechers. |
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+-------------+---------------------+----------------------------------------+
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errors
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------
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In case of a tracker error, the server replies with this packet:
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+-------------+---------------------+----------------------------------------+
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| size | name | description |
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+=============+=====================+========================================+
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| int32_t | action | The action, in this case 3, for error. |
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+-------------+---------------------+----------------------------------------+
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| int32_t | transaction_id | Must match the transaction_id sent |
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| | | from the client. |
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+-------------+---------------------+----------------------------------------+
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| int8_t[] | error_string | The rest of the packet is a string |
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| | | describing the error. |
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+-------------+---------------------+----------------------------------------+
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actions
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-------
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The action fields has the following encoding:
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* connect = 0
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* announce = 1
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* scrape = 2
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* error = 3 (only in server replies)
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credits
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-------
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Protocol designed by Olaf van der Spek
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