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authorMarcoFalke <falke.marco@gmail.com>2019-04-04 16:45:12 -0400
committerMarcoFalke <falke.marco@gmail.com>2019-04-04 16:45:23 -0400
commitc83442e17412b96f00bc29d30763b28184c95f1e (patch)
treeea4d807d295bac57bbf8dc0143669028012ebc2e
parentdaef20fb50c00240ea4a5d653f3a47ee604d25c1 (diff)
parentfa8548c5d13957f57f9b1e20e03002600962f7f0 (diff)
downloadbitcoin-c83442e17412b96f00bc29d30763b28184c95f1e.tar.xz
Merge #15654: net: Remove unused unsanitized user agent string CNode::strSubVer
fa8548c5d1 net: Remove unused unsanitized user agent string CNode::strSubVer (MarcoFalke) Pull request description: I fail to see a use case for this unsanitized byte array. In fact this can easily be confused with `cleanSubVer` and be displayed to the user (or logged) by a simple typo that is hard to find in review. Further reading: https://btcinformation.org/en/developer-reference#version ACKs for commit fa8548: promag: utACK fa8548c, good catch. practicalswift: utACK fa8548c5d13957f57f9b1e20e03002600962f7f0 sipa: utACK fa8548c5d13957f57f9b1e20e03002600962f7f0 Tree-SHA512: 3c3ff1504d1583ad099df9a6aa761458a82ec48a58ef7aaa9b5679a5281dd1b59036ba2932ed708488951a565b669a3083ef70be5a58472ff8677b971162ae2f
-rw-r--r--src/net.cpp1
-rw-r--r--src/net.h14
-rw-r--r--src/net_processing.cpp3
3 files changed, 8 insertions, 10 deletions
diff --git a/src/net.cpp b/src/net.cpp
index ccab4a1718..1335804b06 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2627,7 +2627,6 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn
{
hSocket = hSocketIn;
addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
- strSubVer = "";
hashContinue = uint256();
filterInventoryKnown.reset();
pfilter = MakeUnique<CBloomFilter>();
diff --git a/src/net.h b/src/net.h
index f1d09f5934..7af33ef13b 100644
--- a/src/net.h
+++ b/src/net.h
@@ -53,7 +53,7 @@ static const unsigned int MAX_LOCATOR_SZ = 101;
static const unsigned int MAX_ADDR_TO_SEND = 1000;
/** Maximum length of incoming protocol messages (no message over 4 MB is currently acceptable). */
static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 4 * 1000 * 1000;
-/** Maximum length of strSubVer in `version` message */
+/** Maximum length of the user agent string in `version` message */
static const unsigned int MAX_SUBVERSION_LENGTH = 256;
/** Maximum number of automatic outgoing nodes */
static const int MAX_OUTBOUND_CONNECTIONS = 8;
@@ -650,12 +650,12 @@ public:
// Bind address of our side of the connection
const CAddress addrBind;
std::atomic<int> nVersion{0};
- // strSubVer is whatever byte array we read from the wire. However, this field is intended
- // to be printed out, displayed to humans in various forms and so on. So we sanitize it and
- // store the sanitized version in cleanSubVer. The original should be used when dealing with
- // the network or wire types and the cleaned string used when displayed or logged.
- std::string strSubVer GUARDED_BY(cs_SubVer), cleanSubVer GUARDED_BY(cs_SubVer);
- CCriticalSection cs_SubVer; // used for both cleanSubVer and strSubVer
+ RecursiveMutex cs_SubVer;
+ /**
+ * cleanSubVer is a sanitized string of the user agent byte array we read
+ * from the wire. This cleaned string can safely be logged or displayed.
+ */
+ std::string cleanSubVer GUARDED_BY(cs_SubVer){};
bool m_prefer_evict{false}; // This peer is preferred for eviction.
bool fWhitelisted{false}; // This peer can bypass DoS banning.
bool fFeeler{false}; // If true this node is being used as a short lived feeler.
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 0654a96e26..0f13d6e269 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1843,7 +1843,6 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
ServiceFlags nServices;
int nVersion;
int nSendVersion;
- std::string strSubVer;
std::string cleanSubVer;
int nStartingHeight = -1;
bool fRelay = true;
@@ -1880,6 +1879,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
if (!vRecv.empty())
vRecv >> addrFrom >> nNonce;
if (!vRecv.empty()) {
+ std::string strSubVer;
vRecv >> LIMITED_STRING(strSubVer, MAX_SUBVERSION_LENGTH);
cleanSubVer = SanitizeString(strSubVer);
}
@@ -1911,7 +1911,6 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
pfrom->SetAddrLocal(addrMe);
{
LOCK(pfrom->cs_SubVer);
- pfrom->strSubVer = strSubVer;
pfrom->cleanSubVer = cleanSubVer;
}
pfrom->nStartingHeight = nStartingHeight;