feat(p2p/dnsdisc): re-check tree root when leaf resolution fails #20682#2405
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feat(p2p/dnsdisc): re-check tree root when leaf resolution fails #20682#2405gzliudan wants to merge 9 commits into
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This change restructures the internals of p2p/discover to make room for the discv5 code which will soon be added to this package. - packet type names now have a "V4" suffix. - ListenUDP returns *UDPv4 instead of *Table. This technically breaks the API but the only caller in go-ethereum is package p2p, which uses a compatible interface and doesn't need changes. - The internal transport interface is changed to make Table reusable for v5. - The 'lookup' code moves from table to transport. This required updating the lookup unit test to use udpTest instead of a custom transport.
…um#19540 ethereum#19579 This change implements EIP-868. The UDPv4 transport announces support for the extension in ping/pong and handles enrRequest messages. There are two uses of the extension: If a remote node announces support for EIP-868 in their pong, node revalidation pulls the node's record. The Resolve method requests the record unconditionally.
…thereum#29091 * p2p/discover: export Ping and RequestENR These two are useful for checking the status of a node. * cmd/devp2p: add devp2p debug tool This is a new tool for debugging p2p issues. It supports a few basic tasks for now, but many more things can and will be added in the near future. devp2p enrdump -- prints ENRs readably devp2p discv4 ping -- checks if a node is up devp2p discv4 requestenr -- gets a node's record devp2p discv4 resolve -- finds a node through the DHT
…hereum#19663 * p2p/enr: add entries for for IPv4/IPv6 separation This adds entry types for "ip6", "udp6", "tcp6" keys. The IP type stays around because removing it would break a lot of code and force everyone to care about the distinction. * p2p/enode: track IPv4 and IPv6 address separately LocalNode predicts the local node's UDP endpoint and updates the record. This change makes it predict IPv4 and IPv6 endpoints separately since they can now be in the record at the same time. * p2p/enode: implement base64 text format * all: switch to enode.Parse(...) This allows passing base64-encoded node records to all the places that previously accepted enode:// URLs. The URL format is still supported. * cmd/bootnode, p2p: log node URL instead of ENR ...and return the base64 record in NodeInfo.
The dialer limits itself to one attempt every 30s. Apply the same limit in Server and reject peers which try to connect too eagerly. The check against the limit happens right after accepting the connection. Further changes in this commit ensure we pass the Server logger down to Peer instances, discovery and dialState. Unit test logging now works in all Server tests.
…ereum#20132 ethereum#20421 * p2p/enode: add Iterator and associated utilities * p2p/discover: add RandomNodes iterator * p2p: dial using iterator * cmd/devp2p: add discv4 crawler * cmd/devp2p: WIP nodeset filter * cmd/devp2p: fixup lesFilter * core/forkid: add NewStaticFilter * cmd/devp2p: make -eth-network filter actually work * cmd/devp2p: improve crawl timestamp handling * cmd/devp2p: fix typo * p2p/enode: fix comment typos * p2p/discover: fix comment typos * p2p/discover: rename lookup.next to 'advance' * p2p: lower discovery mixer timeout * p2p/enode: implement dynamic FairMix timeouts * cmd/devp2p: add ropsten support in -eth-network filter * cmd/devp2p: tweak crawler log message
* p2p/dnsdisc: add support for enode.Iterator This changes the dnsdisc.Client API to support the enode.Iterator interface. * p2p/dnsdisc: rate-limit DNS requests * p2p/dnsdisc: preserve linked trees across root updates This improves the way links are handled when the link root changes. Previously, sync would simply remove all links from the current tree and garbage-collect all unreachable trees before syncing the new list of links. This behavior isn't great in certain cases: Consider a structure where trees A, B, and C reference each other and D links to A. If D's link root changed, the sync code would first remove trees A, B and C, only to re-sync them later when the link to A was found again. The fix for this problem is to track the current set of links in each clientTree and removing old links only AFTER all links are synced. * p2p/dnsdisc: deflake iterator test * cmd/devp2p: adapt dnsClient to new p2p/dnsdisc API * p2p/dnsdisc: tiny comment fix
…reum#20682 This adds additional logic to re-resolve the root name of a tree when a couple of leaf requests have failed. We need this change to avoid getting into a failure state where leaf requests keep failing for half an hour when the tree has been updated.
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gzliudan
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anunay-xin,
benjamin202410,
liam-lai and
wanwiset25
wanwiset25
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Jun 29, 2026
benjamin202410
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Jun 29, 2026
anunay-xin
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Ref: ethereum#20682
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