My question is if getaddr consists of message header and if it has some payload, possibly an addr_recv and addr_from like version message. Wiki is pretty basic on this spot.
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1 Answer
It isnt clear what exactly you're asking, but wiki is pretty clear on the structure of the response to a getaddr message.
https://en.bitcoin.it/wiki/Protocol_specification#getaddr
The response to receiving this message is to transmit one or more addr messages with one
or more peers from a database of known active peers.
So the payload of the response will be a bunch of addrs:
https://en.bitcoin.it/wiki/Protocol_specification#addr
Provide information on known nodes of the network. Non-advertised nodes should be forgotten
after typically 3 hours
Payload:
Field Size Description Data type Comments
1+ count var_int Number of address entries (max: 1000)
30x? addr_list (uint32_t + net_addr)[] Address of other nodes on the network.
version < 209 will only read the first
one. The uint32_t is a timestamp (see
note below).
Note: Starting version 31402, addresses are prefixed with a timestamp. If no timestamp is
present, the addresses should not be relayed to other peers, unless it is indeed confirmed
they are up.
And it even provides sample data:
Payload:
01 - 1 address in this message
Address:
E2 15 10 4D - Mon Dec 20 21:50:10 EST 2010 (only when version is >= 31402)
01 00 00 00 00 00 00 00 - 1 (NODE_NETWORK service - see version message)
00 00 00 00 00 00 00 00 00 00 FF FF 0A 00 00 01 - IPv4: 10.0.0.1, IPv6: ::ffff:10.0.0.1 (IPv4-mapped IPv6 address)
20 8D - port 8333
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Yes I have understood what addr message is, but getaddr message consists of a message header with payload 0? Or it's payload has the network address structure because it needs to request addresses? Jun 19, 2014 at 7:51
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3As the wiki says for getaddr, the request has no payload: "No additional data is transmitted with this message."– MattJun 19, 2014 at 11:08
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