- Remove `std::optional` from a number of uses,
- simplify `GetUFVKMetadataForAddress` to `GetUFVKIdForAddress`, and
- add a new `GetUFVKMetadataForAddress` as a wrapper around
`GetUFVKMetadataForReceiver`.
Previously, all pools had to be listed in the selection order. This had a few problems
- if a pool was missing from selection, we’d `assert`
- a logic error could result in note selection from pools that we thought were not needed for
selection (and thus might subvert our strategy re: hiding sender, fewer pools, opportunistic
shielding, etc.)
Now, we only include pools that are intended to be part of the selection order, and all notes from
other pools are cleared before we do any selection.
little memory when we disconnect the node.
Co-authored-by: Kris Nuttycombe <kris@nutty.land>
Co-authored-by: Jack Grigg <str4d@z.cash>
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
While limitations on the influence of attackers on addrman already
exist (affected buckets are restricted to a subset based on incoming
IP / network group), there is no reason to permit them to let them
feed us addresses at more than a multiple of the normal network
rate.
This commit introduces a "token bucket" rate limiter for the
processing of addresses in incoming ADDR and ADDRV2 messages.
Every connection gets an associated token bucket. Processing an
address in an ADDR or ADDRV2 message from non-whitelisted peers
consumes a token from the bucket. If the bucket is empty, the
address is ignored (it is not forwarded or processed). The token
counter increases at a rate of 0.1 tokens per second, and will
accrue up to a maximum of 1000 tokens (the maximum we accept in a
single ADDR or ADDRV2). When a GETADDR is sent to a peer, it
immediately gets 1000 additional tokens, as we actively desire many
addresses from such peers (this may temporarily cause the token
count to exceed 1000).
The rate limit of 0.1 addr/s was chosen based on observation of
honest nodes on the network. Activity in general from most nodes
is either 0, or up to a maximum around 0.025 addr/s for recent
Bitcoin Core nodes. A few (self-identified, through subver) crawler
nodes occasionally exceed 0.1 addr/s.
(cherry-picked from commit bitcoin/bitcoin@0d64b8f709)
I thought we had removed this a long time ago, TBH, its really
confusing feedback to users that we display whether a tx was
broadcast to immediate neighbor nodes, given that has little
indication of whether the tx propagated very far.