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5013c7931a
The disconnect-message branch in statusExchange had two bugs that are the twin of the one fixed in rlpxcmd.go by #34781: the error return from rlp.DecodeBytes was ignored, so decode failures silently produced an "invalid disconnect message" error with no context; and the decoder assumed the spec-compliant list form exclusively, while older geth and some other implementations send the reason as a bare byte. Add a decodeDisconnect helper that accepts both wire forms (matching the legacy-tolerant behavior in p2p.decodeDisconnectMessage) and, on decode failure, include the raw payload so operators can see exactly what the peer sent. Add a unit test for the decoder covering both forms plus the empty-payload error path.
75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
// Copyright 2026 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// go-ethereum 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package ethtest
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import (
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"testing"
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"github.com/ethereum/go-ethereum/p2p"
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)
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func TestDecodeDisconnect(t *testing.T) {
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tests := []struct {
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name string
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payload []byte
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want p2p.DiscReason
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wantErr bool
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}{
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{
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name: "list form (spec-compliant)",
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payload: []byte{0xc1, 0x04}, // [4] = TooManyPeers
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want: p2p.DiscTooManyPeers,
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},
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{
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name: "list form with reason zero",
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payload: []byte{0xc1, 0x80}, // [0] = Requested
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want: p2p.DiscRequested,
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},
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{
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name: "bare byte form (legacy geth)",
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payload: []byte{0x04}, // 4 = TooManyPeers
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want: p2p.DiscTooManyPeers,
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},
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{
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name: "bare byte form zero",
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payload: []byte{0x80}, // 0 = Requested
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want: p2p.DiscRequested,
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},
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{
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name: "empty payload",
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payload: []byte{},
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wantErr: true,
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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got, err := decodeDisconnect(tc.payload)
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if tc.wantErr {
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if err == nil {
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t.Fatalf("expected error, got reason=%v", got)
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}
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return
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}
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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if got != tc.want {
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t.Fatalf("got reason %v, want %v", got, tc.want)
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}
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})
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}
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}
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