0568e81701
This adds an implementation of node discovery via DNS TXT records to the go-ethereum library. The implementation doesn't match EIP-1459 exactly, the main difference being that this implementation uses separate merkle trees for tree links and ENRs. The EIP will be updated to match p2p/dnsdisc. To maintain DNS trees, cmd/devp2p provides a frontend for the p2p/dnsdisc library. The new 'dns' subcommands can be used to create, sign and deploy DNS discovery trees.
64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package dnsdisc
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import (
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"errors"
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"fmt"
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)
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// Entry parse errors.
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var (
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errUnknownEntry = errors.New("unknown entry type")
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errNoPubkey = errors.New("missing public key")
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errBadPubkey = errors.New("invalid public key")
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errInvalidENR = errors.New("invalid node record")
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errInvalidChild = errors.New("invalid child hash")
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errInvalidSig = errors.New("invalid base64 signature")
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errSyntax = errors.New("invalid syntax")
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)
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// Resolver/sync errors
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var (
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errNoRoot = errors.New("no valid root found")
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errNoEntry = errors.New("no valid tree entry found")
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errHashMismatch = errors.New("hash mismatch")
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errENRInLinkTree = errors.New("enr entry in link tree")
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errLinkInENRTree = errors.New("link entry in ENR tree")
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)
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type nameError struct {
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name string
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err error
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}
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func (err nameError) Error() string {
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if ee, ok := err.err.(entryError); ok {
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return fmt.Sprintf("invalid %s entry at %s: %v", ee.typ, err.name, ee.err)
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}
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return err.name + ": " + err.err.Error()
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}
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type entryError struct {
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typ string
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err error
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}
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func (err entryError) Error() string {
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return fmt.Sprintf("invalid %s entry: %v", err.typ, err.err)
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}
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