Merge #20432: net: Treat raw message bytes as uint8_t

fabecce71909c984504c21fa05f91d5f1b471e8c net: Treat raw message bytes as uint8_t (MarcoFalke)

Pull request description:

  Using `uint8_t` from the beginning when messages are `recv`ed has two style benefits:
  * The signedness is clear from reading the code, as it does not depend on the architecture
  * When passing the bytes on, the need for static signedness casts is dropped, making the code a bit less verbose and more coherent

ACKs for top commit:
  laanwj:
    Code review ACK fabecce71909c984504c21fa05f91d5f1b471e8c
  theStack:
    Code Review ACK fabecce71909c984504c21fa05f91d5f1b471e8c
  jonatack:
    Tested ACK fabecce71909c984504c21fa05f91d5f1b471e8c

Tree-SHA512: e6d9803c78633fde3304faf592afa961ff9462a7912d1da97a24720265274aa10ab4168d71b6ec2756b7448dd42585321afee0e5c889e705be778ce9a330d145

6 files changed, 19 insertions, 19 deletions

diff --git a/src/net.cpp b/src/net.cpp
index e8f5bc2116..9c6d7b6375 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -629,7 +629,7 @@ void CNode::copyStats(CNodeStats &stats, const std::vector<bool> &m_asmap)
 }
 #undef X
 
-bool CNode::ReceiveMsgBytes(Span<const char> msg_bytes, bool& complete)
+bool CNode::ReceiveMsgBytes(Span<const uint8_t> msg_bytes, bool& complete)
 {
     complete = false;
     const auto time = GetTime<std::chrono::microseconds>();
@@ -673,7 +673,7 @@ bool CNode::ReceiveMsgBytes(Span<const char> msg_bytes, bool& complete)
     return true;
 }
 
-int V1TransportDeserializer::readHeader(Span<const char> msg_bytes)
+int V1TransportDeserializer::readHeader(Span<const uint8_t> msg_bytes)
 {
     // copy data to temporary parsing buffer
     unsigned int nRemaining = CMessageHeader::HEADER_SIZE - nHdrPos;
@@ -713,7 +713,7 @@ int V1TransportDeserializer::readHeader(Span<const char> msg_bytes)
     return nCopy;
 }
 
-int V1TransportDeserializer::readData(Span<const char> msg_bytes)
+int V1TransportDeserializer::readData(Span<const uint8_t> msg_bytes)
 {
     unsigned int nRemaining = hdr.nMessageSize - nDataPos;
     unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
@@ -723,7 +723,7 @@ int V1TransportDeserializer::readData(Span<const char> msg_bytes)
         vRecv.resize(std::min(hdr.nMessageSize, nDataPos + nCopy + 256 * 1024));
     }
 
-    hasher.Write(MakeUCharSpan(msg_bytes.first(nCopy)));
+    hasher.Write(msg_bytes.first(nCopy));
     memcpy(&vRecv[nDataPos], msg_bytes.data(), nCopy);
     nDataPos += nCopy;
 
@@ -1463,18 +1463,18 @@ void CConnman::SocketHandler()
         if (recvSet || errorSet)
         {
             // typical socket buffer is 8K-64K
-            char pchBuf[0x10000];
+            uint8_t pchBuf[0x10000];
             int nBytes = 0;
             {
                 LOCK(pnode->cs_hSocket);
                 if (pnode->hSocket == INVALID_SOCKET)
                     continue;
-                nBytes = recv(pnode->hSocket, pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
+                nBytes = recv(pnode->hSocket, (char*)pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
             }
             if (nBytes > 0)
             {
                 bool notify = false;
-                if (!pnode->ReceiveMsgBytes(Span<const char>(pchBuf, nBytes), notify))
+                if (!pnode->ReceiveMsgBytes(Span<const uint8_t>(pchBuf, nBytes), notify))
                     pnode->CloseSocketDisconnect();
                 RecordBytesRecv(nBytes);
                 if (notify) {
diff --git a/src/net.h b/src/net.h
index b14c860f7d..fe7b72c920 100644
--- a/src/net.h
+++ b/src/net.h
@@ -758,7 +758,7 @@ public:
     // set the serialization context version
     virtual void SetVersion(int version) = 0;
     /** read and deserialize data, advances msg_bytes data pointer */
-    virtual int Read(Span<const char>& msg_bytes) = 0;
+    virtual int Read(Span<const uint8_t>& msg_bytes) = 0;
     // decomposes a message from the context
     virtual Optional<CNetMessage> GetMessage(std::chrono::microseconds time, uint32_t& out_err) = 0;
     virtual ~TransportDeserializer() {}
@@ -779,8 +779,8 @@ private:
     unsigned int nDataPos;
 
     const uint256& GetMessageHash() const;
-    int readHeader(Span<const char> msg_bytes);
-    int readData(Span<const char> msg_bytes);
+    int readHeader(Span<const uint8_t> msg_bytes);
+    int readData(Span<const uint8_t> msg_bytes);
 
     void Reset() {
         vRecv.clear();
@@ -814,7 +814,7 @@ public:
         hdrbuf.SetVersion(nVersionIn);
         vRecv.SetVersion(nVersionIn);
     }
-    int Read(Span<const char>& msg_bytes) override
+    int Read(Span<const uint8_t>& msg_bytes) override
     {
         int ret = in_data ? readData(msg_bytes) : readHeader(msg_bytes);
         if (ret < 0) {
@@ -1132,7 +1132,7 @@ public:
      * @return  True if the peer should stay connected,
      *          False if the peer should be disconnected from.
      */
-    bool ReceiveMsgBytes(Span<const char> msg_bytes, bool& complete);
+    bool ReceiveMsgBytes(Span<const uint8_t> msg_bytes, bool& complete);
 
     void SetCommonVersion(int greatest_common_version)
     {
diff --git a/src/test/fuzz/net.cpp b/src/test/fuzz/net.cpp
index 36afd4744d..a0c8b7aac5 100644
--- a/src/test/fuzz/net.cpp
+++ b/src/test/fuzz/net.cpp
@@ -128,7 +128,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
         case 11: {
             const std::vector<uint8_t> b = ConsumeRandomLengthByteVector(fuzzed_data_provider);
             bool complete;
-            node.ReceiveMsgBytes({(const char*)b.data(), b.size()}, complete);
+            node.ReceiveMsgBytes(b, complete);
             break;
         }
         }
diff --git a/src/test/fuzz/p2p_transport_deserializer.cpp b/src/test/fuzz/p2p_transport_deserializer.cpp
index 3feabcc99a..7a6236efac 100644
--- a/src/test/fuzz/p2p_transport_deserializer.cpp
+++ b/src/test/fuzz/p2p_transport_deserializer.cpp
@@ -21,7 +21,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
 {
     // Construct deserializer, with a dummy NodeId
     V1TransportDeserializer deserializer{Params(), (NodeId)0, SER_NETWORK, INIT_PROTO_VERSION};
-    Span<const char> msg_bytes{(const char*)buffer.data(), buffer.size()};
+    Span<const uint8_t> msg_bytes{buffer};
     while (msg_bytes.size() > 0) {
         const int handled = deserializer.Read(msg_bytes);
         if (handled < 0) {
diff --git a/src/test/util/net.cpp b/src/test/util/net.cpp
index 3b31ec4031..847a490e03 100644
--- a/src/test/util/net.cpp
+++ b/src/test/util/net.cpp
@@ -7,7 +7,7 @@
 #include <chainparams.h>
 #include <net.h>
 
-void ConnmanTestMsg::NodeReceiveMsgBytes(CNode& node, Span<const char> msg_bytes, bool& complete) const
+void ConnmanTestMsg::NodeReceiveMsgBytes(CNode& node, Span<const uint8_t> msg_bytes, bool& complete) const
 {
     assert(node.ReceiveMsgBytes(msg_bytes, complete));
     if (complete) {
@@ -29,11 +29,11 @@ void ConnmanTestMsg::NodeReceiveMsgBytes(CNode& node, Span<const char> msg_bytes
 
 bool ConnmanTestMsg::ReceiveMsgFrom(CNode& node, CSerializedNetMsg& ser_msg) const
 {
-    std::vector<unsigned char> ser_msg_header;
+    std::vector<uint8_t> ser_msg_header;
     node.m_serializer->prepareForTransport(ser_msg, ser_msg_header);
 
     bool complete;
-    NodeReceiveMsgBytes(node, {(const char*)ser_msg_header.data(), ser_msg_header.size()}, complete);
-    NodeReceiveMsgBytes(node, {(const char*)ser_msg.data.data(), ser_msg.data.size()}, complete);
+    NodeReceiveMsgBytes(node, ser_msg_header, complete);
+    NodeReceiveMsgBytes(node, ser_msg.data, complete);
     return complete;
 }
diff --git a/src/test/util/net.h b/src/test/util/net.h
index fe423e7e89..1208e92762 100644
--- a/src/test/util/net.h
+++ b/src/test/util/net.h
@@ -25,7 +25,7 @@ struct ConnmanTestMsg : public CConnman {
 
     void ProcessMessagesOnce(CNode& node) { m_msgproc->ProcessMessages(&node, flagInterruptMsgProc); }
 
-    void NodeReceiveMsgBytes(CNode& node, Span<const char> msg_bytes, bool& complete) const;
+    void NodeReceiveMsgBytes(CNode& node, Span<const uint8_t> msg_bytes, bool& complete) const;
 
     bool ReceiveMsgFrom(CNode& node, CSerializedNetMsg& ser_msg) const;
 };