lightninglabs / neutrino / 469

69%

master: 72%

Pull #177

travis-ci

neutrino: manually apply service bits to DNS seed addrs

In order to be able to bootstrap a new node w/o having to manually use a
`connect` or `addpeer`, we'll now assume the returned addresses have the
proper service bits implicitly. Since the seeds return just A records,
unless we pack things into IPv6, they can't explicitly signal the
service bits they support. Many of the DNS seeds were recently upgraded
to be able to respond to the `x49` subdomain (full node, segwit, bip
158), so with this change, usersr can now bootstrap a new node w/o any
externally obtained addresses.

Note that with this approach, if they peer actually supports of subset
of the features we need, they'll be lost. However, As we grow to
eventually need these additional services, the RequiredServices constant
will be updated, allowing us to filter based on these new requirements.

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