From fa6c3dea420b6c50c164ccc34f4e9e8a7d9a8022 Mon Sep 17 00:00:00 2001
From: MarcoFalke <falke.marco@gmail.com>
Date: Sun, 12 Aug 2018 07:55:01 -0400
Subject: [PATCH] p2p: Clarify control flow in ProcessMessage()
---
src/net_processing.cpp | 117 +++++++++++++++++------------------------
1 file changed, 49 insertions(+), 68 deletions(-)
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 88999ba73..c31e1c0c6 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1618,8 +1618,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
return true;
}
- else if (strCommand == NetMsgType::VERSION)
- {
+ if (strCommand == NetMsgType::VERSION) {
// Each connection can only send one version message
if (pfrom->nVersion != 0)
{
@@ -1796,9 +1795,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
return true;
}
-
- else if (pfrom->nVersion == 0)
- {
+ if (pfrom->nVersion == 0) {
// Must have a version message before anything else
LOCK(cs_main);
Misbehaving(pfrom->GetId(), 1);
@@ -1842,18 +1839,17 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion));
}
pfrom->fSuccessfullyConnected = true;
+ return true;
}
- else if (!pfrom->fSuccessfullyConnected)
- {
+ if (!pfrom->fSuccessfullyConnected) {
// Must have a verack message before anything else
LOCK(cs_main);
Misbehaving(pfrom->GetId(), 1);
return false;
}
- else if (strCommand == NetMsgType::ADDR)
- {
+ if (strCommand == NetMsgType::ADDR) {
std::vector<CAddress> vAddr;
vRecv >> vAddr;
@@ -1900,16 +1896,16 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
pfrom->fGetAddr = false;
if (pfrom->fOneShot)
pfrom->fDisconnect = true;
+ return true;
}
- else if (strCommand == NetMsgType::SENDHEADERS)
- {
+ if (strCommand == NetMsgType::SENDHEADERS) {
LOCK(cs_main);
State(pfrom->GetId())->fPreferHeaders = true;
+ return true;
}
- else if (strCommand == NetMsgType::SENDCMPCT)
- {
+ if (strCommand == NetMsgType::SENDCMPCT) {
bool fAnnounceUsingCMPCTBLOCK = false;
uint64_t nCMPCTBLOCKVersion = 0;
vRecv >> fAnnounceUsingCMPCTBLOCK >> nCMPCTBLOCKVersion;
@@ -1929,11 +1925,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
State(pfrom->GetId())->fSupportsDesiredCmpctVersion = (nCMPCTBLOCKVersion == 1);
}
}
+ return true;
}
-
- else if (strCommand == NetMsgType::INV)
- {
+ if (strCommand == NetMsgType::INV) {
std::vector<CInv> vInv;
vRecv >> vInv;
if (vInv.size() > MAX_INV_SZ)
@@ -1987,11 +1982,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
}
}
}
+ return true;
}
-
- else if (strCommand == NetMsgType::GETDATA)
- {
+ if (strCommand == NetMsgType::GETDATA) {
std::vector<CInv> vInv;
vRecv >> vInv;
if (vInv.size() > MAX_INV_SZ)
@@ -2009,11 +2003,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
pfrom->vRecvGetData.insert(pfrom->vRecvGetData.end(), vInv.begin(), vInv.end());
ProcessGetData(pfrom, chainparams, connman, interruptMsgProc);
+ return true;
}
-
- else if (strCommand == NetMsgType::GETBLOCKS)
- {
+ if (strCommand == NetMsgType::GETBLOCKS) {
CBlockLocator locator;
uint256 hashStop;
vRecv >> locator >> hashStop;
@@ -2078,11 +2071,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
break;
}
}
+ return true;
}
-
- else if (strCommand == NetMsgType::GETBLOCKTXN)
- {
+ if (strCommand == NetMsgType::GETBLOCKTXN) {
BlockTransactionsRequest req;
vRecv >> req;
@@ -2128,11 +2120,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
assert(ret);
SendBlockTransactions(block, req, pfrom, connman);
+ return true;
}
-
- else if (strCommand == NetMsgType::GETHEADERS)
- {
+ if (strCommand == NetMsgType::GETHEADERS) {
CBlockLocator locator;
uint256 hashStop;
vRecv >> locator >> hashStop;
@@ -2196,11 +2187,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
// in the SendMessages logic.
nodestate->pindexBestHeaderSent = pindex ? pindex : chainActive.Tip();
connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::HEADERS, vHeaders));
+ return true;
}
-
- else if (strCommand == NetMsgType::TX)
- {
+ if (strCommand == NetMsgType::TX) {
// Stop processing the transaction early if
// We are in blocks only mode and peer is either not whitelisted or whitelistrelay is off
if (!fRelayTxes && (!pfrom->fWhitelisted || !gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)))
@@ -2384,10 +2374,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
Misbehaving(pfrom->GetId(), nDoS);
}
}
+ return true;
}
-
- else if (strCommand == NetMsgType::CMPCTBLOCK && !fImporting && !fReindex) // Ignore blocks received while importing
+ if (strCommand == NetMsgType::CMPCTBLOCK && !fImporting && !fReindex) // Ignore blocks received while importing
{
CBlockHeaderAndShortTxIDs cmpctblock;
vRecv >> cmpctblock;
@@ -2605,10 +2595,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
MarkBlockAsReceived(pblock->GetHash());
}
}
-
+ return true;
}
- else if (strCommand == NetMsgType::BLOCKTXN && !fImporting && !fReindex) // Ignore blocks received while importing
+ if (strCommand == NetMsgType::BLOCKTXN && !fImporting && !fReindex) // Ignore blocks received while importing
{
BlockTransactions resp;
vRecv >> resp;
@@ -2680,10 +2670,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
mapBlockSource.erase(pblock->GetHash());
}
}
+ return true;
}
-
- else if (strCommand == NetMsgType::HEADERS && !fImporting && !fReindex) // Ignore headers received while importing
+ if (strCommand == NetMsgType::HEADERS && !fImporting && !fReindex) // Ignore headers received while importing
{
std::vector<CBlockHeader> headers;
@@ -2708,7 +2698,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
return ProcessHeadersMessage(pfrom, connman, headers, chainparams, should_punish);
}
- else if (strCommand == NetMsgType::BLOCK && !fImporting && !fReindex) // Ignore blocks received while importing
+ if (strCommand == NetMsgType::BLOCK && !fImporting && !fReindex) // Ignore blocks received while importing
{
std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
vRecv >> *pblock;
@@ -2734,11 +2724,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
LOCK(cs_main);
mapBlockSource.erase(pblock->GetHash());
}
+ return true;
}
-
- else if (strCommand == NetMsgType::GETADDR)
- {
+ if (strCommand == NetMsgType::GETADDR) {
// This asymmetric behavior for inbound and outbound connections was introduced
// to prevent a fingerprinting attack: an attacker can send specific fake addresses
// to users' AddrMan and later request them by sending getaddr messages.
@@ -2762,11 +2751,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
FastRandomContext insecure_rand;
for (const CAddress &addr : vAddr)
pfrom->PushAddress(addr, insecure_rand);
+ return true;
}
-
- else if (strCommand == NetMsgType::MEMPOOL)
- {
+ if (strCommand == NetMsgType::MEMPOOL) {
if (!(pfrom->GetLocalServices() & NODE_BLOOM) && !pfrom->fWhitelisted)
{
LogPrint(BCLog::NET, "mempool request with bloom filters disabled, disconnect peer=%d\n", pfrom->GetId());
@@ -2783,11 +2771,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
LOCK(pfrom->cs_inventory);
pfrom->fSendMempool = true;
+ return true;
}
-
- else if (strCommand == NetMsgType::PING)
- {
+ if (strCommand == NetMsgType::PING) {
if (pfrom->nVersion > BIP0031_VERSION)
{
uint64_t nonce = 0;
@@ -2805,11 +2792,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
// return very quickly.
connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::PONG, nonce));
}
+ return true;
}
-
- else if (strCommand == NetMsgType::PONG)
- {
+ if (strCommand == NetMsgType::PONG) {
int64_t pingUsecEnd = nTimeReceived;
uint64_t nonce = 0;
size_t nAvail = vRecv.in_avail();
@@ -2862,11 +2848,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
if (bPingFinished) {
pfrom->nPingNonceSent = 0;
}
+ return true;
}
-
- else if (strCommand == NetMsgType::FILTERLOAD)
- {
+ if (strCommand == NetMsgType::FILTERLOAD) {
CBloomFilter filter;
vRecv >> filter;
@@ -2883,11 +2868,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
pfrom->pfilter->UpdateEmptyFull();
pfrom->fRelayTxes = true;
}
+ return true;
}
-
- else if (strCommand == NetMsgType::FILTERADD)
- {
+ if (strCommand == NetMsgType::FILTERADD) {
std::vector<unsigned char> vData;
vRecv >> vData;
@@ -2908,19 +2892,19 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
LOCK(cs_main);
Misbehaving(pfrom->GetId(), 100);
}
+ return true;
}
-
- else if (strCommand == NetMsgType::FILTERCLEAR)
- {
+ if (strCommand == NetMsgType::FILTERCLEAR) {
LOCK(pfrom->cs_filter);
if (pfrom->GetLocalServices() & NODE_BLOOM) {
pfrom->pfilter.reset(new CBloomFilter());
}
pfrom->fRelayTxes = true;
+ return true;
}
- else if (strCommand == NetMsgType::FEEFILTER) {
+ if (strCommand == NetMsgType::FEEFILTER) {
CAmount newFeeFilter = 0;
vRecv >> newFeeFilter;
if (MoneyRange(newFeeFilter)) {
@@ -2930,20 +2914,17 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
}
LogPrint(BCLog::NET, "received: feefilter of %s from peer=%d\n", CFeeRate(newFeeFilter).ToString(), pfrom->GetId());
}
+ return true;
}
- else if (strCommand == NetMsgType::NOTFOUND) {
+ if (strCommand == NetMsgType::NOTFOUND) {
// We do not care about the NOTFOUND message, but logging an Unknown Command
// message would be undesirable as we transmit it ourselves.
+ return true;
}
- else {
- // Ignore unknown commands for extensibility
- LogPrint(BCLog::NET, "Unknown command \"%s\" from peer=%d\n", SanitizeString(strCommand), pfrom->GetId());
- }
-
-
-
+ // Ignore unknown commands for extensibility
+ LogPrint(BCLog::NET, "Unknown command \"%s\" from peer=%d\n", SanitizeString(strCommand), pfrom->GetId());
return true;
}