fix(p2p/pex): do not send PEX request in fast dial mode (backport #4644)#4648
Merged
jmalicevic merged 1 commit intov1.xfrom Dec 12, 2024
Merged
fix(p2p/pex): do not send PEX request in fast dial mode (backport #4644)#4648jmalicevic merged 1 commit intov1.xfrom
jmalicevic merged 1 commit intov1.xfrom
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Solves #4620. Fixes an issue introduced by #3360. In short, when receiving addresses from a configured seed node, the peer immediately dials the received addresses, without waiting for the `defaultEnsurePeersPeriod` (30s). This is a desired behavior, the "fast dial mode" in the title. However, for preventing abuse, a node only accepts PEX requests from a peer every `minReceiveRequestInterval()` time, set to `defaultEnsurePeersPeriod/3` (10s). When running this "fast dial mode", however, a PEX request can be send, in some unlucky setup, to the same peer without waiting for the full defaultEnsurePeersPeriod` (30s). The problem is that at the receive side, a node keeps track of the latest PEX request received from each peer. If two requests are received with an interval lower than `minReceiveRequestInterval()`, the peer is considered abusive: it is disconnected with an `ErrReceivedPEXRequestTooSoon` error and banned from the address book. This PR proposes a workaround to prevent the above mentioned scenario. --- #### PR checklist - [ ] Tests written/updated - [ ] Changelog entry added in `.changelog` (we use [unclog](https://github.com/informalsystems/unclog) to manage our changelog) - [ ] Updated relevant documentation (`docs/` or `spec/`) and code comments Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> (cherry picked from commit 491379f)
jmalicevic
approved these changes
Dec 12, 2024
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Solves #4620.
Fixes an issue introduced by #3360.
In short, when receiving addresses from a configured seed node, the peer immediately dials the received addresses, without waiting for the
defaultEnsurePeersPeriod(30s). This is a desired behavior, the "fast dial mode" in the title.However, for preventing abuse, a node only accepts PEX requests from a peer every
minReceiveRequestInterval()time, set todefaultEnsurePeersPeriod/3(10s). When running this "fast dial mode", however, a PEX request can be send, in some unlucky setup, to the same peer without waiting for the full defaultEnsurePeersPeriod` (30s).The problem is that at the receive side, a node keeps track of the latest PEX request received from each peer. If two requests are received with an interval lower than
minReceiveRequestInterval(), the peer is considered abusive: it is disconnected with anErrReceivedPEXRequestTooSoonerror and banned from the address book.This PR proposes a workaround to prevent the above mentioned scenario.
PR checklist
.changelog(we use unclog to manage our changelog)docs/orspec/) and code commentsThis is an automatic backport of pull request fix(p2p/pex): do not send PEX request in fast dial mode #4644 done by Mergify.