From ca18202eb9a94de1d4b51c1572fa74edfa2773bf Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Tue, 24 May 2016 18:49:54 +0200
Subject: eth: enable bad block reports

We used to have reporting of bad blocks, but it was disabled
before the Frontier release. We need it back because users
are usually unable to provide the full RLP data of a bad
block when it occurs.

A shortcoming of this particular implementation is that the
origin peer is not tracked for blocks received during eth/63
sync. No origin peer info is still better than no report at
all though.
---
 eth/bad_block.go | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 eth/bad_block.go

(limited to 'eth/bad_block.go')

diff --git a/eth/bad_block.go b/eth/bad_block.go
new file mode 100644
index 000000000..3a6c3d85c
--- /dev/null
+++ b/eth/bad_block.go
@@ -0,0 +1,74 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package eth
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/rlp"
+)
+
+const (
+	// The Ethereum main network genesis block.
+	defaultGenesisHash = "0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3"
+	badBlocksURL       = "https://badblocks.ethdev.com"
+)
+
+var EnableBadBlockReporting = false
+
+func sendBadBlockReport(block *types.Block, err error) {
+	if !EnableBadBlockReporting {
+		return
+	}
+
+	var (
+		blockRLP, _ = rlp.EncodeToBytes(block)
+		params      = map[string]interface{}{
+			"block":     common.Bytes2Hex(blockRLP),
+			"blockHash": block.Hash().Hex(),
+			"errortype": err.Error(),
+			"client":    "go",
+		}
+	)
+	if !block.ReceivedAt.IsZero() {
+		params["receivedAt"] = block.ReceivedAt.UTC().String()
+	}
+	if p, ok := block.ReceivedFrom.(*peer); ok {
+		params["receivedFrom"] = map[string]interface{}{
+			"enode":           fmt.Sprintf("enode://%x@%v", p.ID(), p.RemoteAddr()),
+			"name":            p.Name(),
+			"protocolVersion": p.version,
+		}
+	}
+	jsonStr, _ := json.Marshal(map[string]interface{}{"method": "eth_badBlock", "id": "1", "jsonrpc": "2.0", "params": []interface{}{params}})
+	client := http.Client{Timeout: 8 * time.Second}
+	resp, err := client.Post(badBlocksURL, "application/json", bytes.NewReader(jsonStr))
+	if err != nil {
+		glog.V(logger.Debug).Infoln(err)
+		return
+	}
+	glog.V(logger.Debug).Infof("Bad Block Report posted (%d)", resp.StatusCode)
+	resp.Body.Close()
+}
-- 
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