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82 lines
2.8 KiB
Text
82 lines
2.8 KiB
Text
This is a somewhat incomplete description of the Azureus messaging
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protocol which is further described here:
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http://www.azureuswiki.com/index.php/Azureus_messaging_protocol
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Like normal bittorrent messages, all azureus messages begin with the
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length of the rest of the message in bytes as a 4-byte integer in
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network byte order. This length does not include the 4 bytes for the
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length itself.
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After that is another 4-byte network byte order integer containing the
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length of the following message id string in bytes, then the message
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id string, then a 1 byte integer containing the protocol version. The
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current version is 1.
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The message payload format for various message IDs is below.
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AZ_HANDSHAKE
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payload is a bencoded dictionary:
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identity:
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string, 20 bytes client identity. The identity should be
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calculated once on startup similarly to the peer_id, except
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than each byte should be completely random and not limited to
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alphanumeric characters.
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client:
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string, client name. eg: Transmission
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version:
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string, client version. eg: 0.7
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tcp_port: (optional)
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int, tcp port for incoming peer connections.
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udp_port: (optional)
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int, udp listening port (what is this used for exactly?)
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udp2_port: (optional)
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int, udp non-data listening port (I don't know what this is for either)
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handshake_type: (optional)
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int, 0 for plain or 1 for crypto
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messages:
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list, each item is a dict for the supported messages and versions:
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id:
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string, message id
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ver:
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string, 1 byte version, currently 1
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AZ_PEER_EXCHANGE
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these messages should be sent approximately once a minute (is this true?)
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payload is a bencoded dictionary:
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infohash:
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string, 20 byte info_hash for the torrent
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added:
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list, each item is a 6 byte string for an IP address and port
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added since the last peer exchange message.
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added_HST:
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string, one byte for each item in the added list.
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Each byte is the handshake type (0 plain, 1 crypto) for the matching
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item in the added list.
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added_UDP:
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string, two bytes for each item in the added list.
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Each pair of bytes is the UDP port (network byte order) for the
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matching item in the added list.
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dropped:
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same format as added, contains peers dropped since last peer exchange
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dropped_HST:
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same format as added_HST
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dropped_UDP:
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same format as added_UDP
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BT_KEEP_ALIVE
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zero-length payload
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The following messages all have the same payload as the corresponding
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bittorrent message, not including the bittorrent 4-byte length and
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1-byte id.
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BT_CHOKE - 0
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BT_UNCHOKE - 1
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BT_INTERESTED - 2
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BT_UNINTERESTED - 3
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BT_HAVE - 4
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BT_BITFIELD - 5
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BT_REQUEST - 6
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BT_PIECE - 7
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BT_CANCEL - 8
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