Merge #19316: [net] Cleanup logic around connection types

01e283068b9e6214f2d77a2f772a4244ebfe2274 [net] Remove unnecessary default args on CNode constructor (Amiti Uttarwar)
bc5d65b3ca41eebb1738fdda4451d1466e77772e [refactor] Remove IsOutboundDisconnectionCandidate (Amiti Uttarwar)
2f2e13b6c2c8741ca9d825eaaef736ede484bc85 [net/refactor] Simplify multiple-connection checks (Amiti Uttarwar)
7f7b83deb2427599c129f4ff581d4d045461e459 [net/refactor] Rework ThreadOpenConnections logic (Amiti Uttarwar)
35839e963bf61d2da0d12f5b8cea74ac0e0fbd7b [net] Fix bug where AddrFetch connections would be counted as outbound full relay (Amiti Uttarwar)
4972c21b671ff73f13a1b5053338b6abbdb471b5 [net/refactor] Clarify logic for selecting connections in ThreadOpenConnections (Amiti Uttarwar)
60156f5fc40d56bb532278f16ce632c5a8b8035e [net/refactor] Remove fInbound flag from CNode (Amiti Uttarwar)
7b322df6296609570e368e5f326979279041c11f [net/refactor] Remove m_addr_fetch member var from CNode (Amiti Uttarwar)
14923422b08ac4b21b35c426bf0e1b9e7c97983b [net/refactor] Remove fFeeler flag from CNode (Amiti Uttarwar)
49efac5cae7333c6700d9b737d09fae0f3f4d7fa [net/refactor] Remove m_manual_connection flag from CNode (Amiti Uttarwar)
d3698b5ee309cf0f0cdfb286d6b30a256d7deae5 [net/refactor] Add connection type as a member var to CNode (Amiti Uttarwar)
46578c03e92a55925308363ccdad04dcfc820d96 [doc] Describe different connection types (Amiti Uttarwar)
442abae2bac7bff85886143df01e14215532b974 [net/refactor] Add AddrFetch connections to ConnectionType enum (Amiti Uttarwar)
af59feb05235ecb85ec9d75b09c66e71268c9889 [net/refactor] Extract m_addr_known logic from initializer list (Amiti Uttarwar)
e1bc29812ddf1d946bc5acca406a7ed2dca064a6 [net/refactor] Add block relay only connections to ConnectionType enum (Amiti Uttarwar)
0e52a659a2de915fc3dce37fc8fac39be1c8b6fa [net/refactor] Add feeler connections to ConnectionType enum (Amiti Uttarwar)
1521c47438537e192230486dffcec0228a53878d [net/refactor] Add manual connections to ConnectionType enum (Amiti Uttarwar)
26304b4100201754fb32440bec3e3b78cd3f0e6d [net/refactor] Introduce an enum to distinguish type of connection (Amiti Uttarwar)
3f1b7140e95d0f8f958cb35f31c3d964c57e484d scripted-diff: Rename OneShot to AddrFetch (Amiti Uttarwar)

Pull request description:

  **This is part 1 of #19315, which enables the ability to test `outbound` and `block-relay-only` connections from the functional tests.** Please see that PR for more information of overall functionality.

  **This PR simplifies how we manage different connection types.** It introduces an enum with the various types of connections so we can explicitly define the connection type. The existing system relies on a series of independent flags, then has asserts scattered around to ensure that conflicting flags are not enabled at the same time. I find this approach to be both brittle and confusing. While making these changes, I found a small bug due to the silent assumptions.

  This PR also proposes a rename from `OneShot` to `AddrFetch`. I find the name `OneShot` to be very confusing, especially when we also have `onetry` manual connections. Everyone I've talked to offline has agreed that the name is confusing, so I propose a potential alternative. I think this is a good opportunity for a rename since I'm creating an enum to explicitly define the connection types.
  (some context for the unfamiliar: `oneshot` or `addrfetch` connections are short-lived connections created on startup. They connect to the seed peers, send a `getaddr` to solicit addresses, then close the connection.)

  Overview of this PR:
  * rename `oneshot` to `addrfetch`
  * introduce `ConnectionType` enum
  * one by one, add different connection types to the enum
  * expose the `conn_type` on CNode, and use this to reduce reliance on flags (& asserts)
  * fix the bug in counting different type of connections
  * some additional cleanup to simplify logic and make expectations explicit/inclusive rather than implicit/exclusive.

ACKs for top commit:
  jnewbery:
    utACK 01e283068b9e6214f2d77a2f772a4244ebfe2274
  laanwj:
    Code review ACK 01e283068b9e6214f2d77a2f772a4244ebfe2274, the commits are pretty straightforward to follow, and I think this is a move in the right direction overall
  vasild:
    ACK 01e283068
  sdaftuar:
    ACK 01e283068b9e6214f2d77a2f772a4244ebfe2274.
  fanquake:
    ACK 01e283068b9e6214f2d77a2f772a4244ebfe2274 - I don't have as much experience with the networking code but these changes look fairly straight forward, the new code seems more robust/understandable and the additional documentation is great. I'm glad that a followup branch is already underway. There might be some more review comments here later today, so keep an eye on the discussion, however I'm going to merge this now.
  jb55:
    wow this code was messy before... ACK 01e283068b9e6214f2d77a2f772a4244ebfe2274

Tree-SHA512: 7bb644a6ed5849913d777ebc2ff89133ca0fbef680355a9a344e07496a979e6f9ff21a958e8eea93dcd7d5c343682b0c7174b1a3de380a4247eaae73da436e15

9 files changed, 186 insertions, 140 deletions

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index a7c9e33f07..ffd2076c9a 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -110,7 +110,7 @@ public:
 
         // Note that of those which support the service bits prefix, most only support a subset of
         // possible options.
-        // This is fine at runtime as we'll fall back to using them as a oneshot if they don't support the
+        // This is fine at runtime as we'll fall back to using them as an addrfetch if they don't support the
         // service bits we want, but we should get them updated to support all service bits wanted by any
         // release ASAP to avoid it where possible.
         vSeeds.emplace_back("seed.bitcoin.sipa.be"); // Pieter Wuille, only supports x1, x5, x9, and xd
diff --git a/src/net.cpp b/src/net.cpp
index 25fa4709b0..8c214dc05f 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -105,10 +105,10 @@ std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
 static bool vfLimited[NET_MAX] GUARDED_BY(cs_mapLocalHost) = {};
 std::string strSubVersion;
 
-void CConnman::AddOneShot(const std::string& strDest)
+void CConnman::AddAddrFetch(const std::string& strDest)
 {
-    LOCK(cs_vOneShots);
-    vOneShots.push_back(strDest);
+    LOCK(m_addr_fetches_mutex);
+    m_addr_fetches.push_back(strDest);
 }
 
 uint16_t GetListenPort()
@@ -346,7 +346,7 @@ bool CConnman::CheckIncomingNonce(uint64_t nonce)
 {
     LOCK(cs_vNodes);
     for (const CNode* pnode : vNodes) {
-        if (!pnode->fSuccessfullyConnected && !pnode->fInbound && pnode->GetLocalNonce() == nonce)
+        if (!pnode->fSuccessfullyConnected && !pnode->IsInboundConn() && pnode->GetLocalNonce() == nonce)
             return false;
     }
     return true;
@@ -368,8 +368,10 @@ static CAddress GetBindAddress(SOCKET sock)
     return addr_bind;
 }
 
-CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, bool manual_connection, bool block_relay_only)
+CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, ConnectionType conn_type)
 {
+    assert(conn_type != ConnectionType::INBOUND);
+
     if (pszDest == nullptr) {
         if (IsLocal(addrConnect))
             return nullptr;
@@ -432,7 +434,7 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
             if (hSocket == INVALID_SOCKET) {
                 return nullptr;
             }
-            connected = ConnectSocketDirectly(addrConnect, hSocket, nConnectTimeout, manual_connection);
+            connected = ConnectSocketDirectly(addrConnect, hSocket, nConnectTimeout, conn_type == ConnectionType::MANUAL);
         }
         if (!proxyConnectionFailed) {
             // If a connection to the node was attempted, and failure (if any) is not caused by a problem connecting to
@@ -459,7 +461,7 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
     NodeId id = GetNewNodeId();
     uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
     CAddress addr_bind = GetBindAddress(hSocket);
-    CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addrConnect, CalculateKeyedNetGroup(addrConnect), nonce, addr_bind, pszDest ? pszDest : "", false, block_relay_only);
+    CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addrConnect, CalculateKeyedNetGroup(addrConnect), nonce, addr_bind, pszDest ? pszDest : "", conn_type);
     pnode->AddRef();
 
     // We're making a new connection, harvest entropy from the time (and our peer count)
@@ -536,8 +538,8 @@ void CNode::copyStats(CNodeStats &stats, const std::vector<bool> &m_asmap)
         LOCK(cs_SubVer);
         X(cleanSubVer);
     }
-    X(fInbound);
-    X(m_manual_connection);
+    stats.fInbound = IsInboundConn();
+    stats.m_manual_connection = IsManualConn();
     X(nStartingHeight);
     {
         LOCK(cs_vSend);
@@ -872,7 +874,7 @@ bool CConnman::AttemptToEvictConnection()
         for (const CNode* node : vNodes) {
             if (node->HasPermission(PF_NOBAN))
                 continue;
-            if (!node->fInbound)
+            if (!node->IsInboundConn())
                 continue;
             if (node->fDisconnect)
                 continue;
@@ -983,7 +985,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
     {
         LOCK(cs_vNodes);
         for (const CNode* pnode : vNodes) {
-            if (pnode->fInbound) nInbound++;
+            if (pnode->IsInboundConn()) nInbound++;
         }
     }
 
@@ -1048,7 +1050,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
     if (NetPermissions::HasFlag(permissionFlags, PF_BLOOMFILTER)) {
         nodeServices = static_cast<ServiceFlags>(nodeServices | NODE_BLOOM);
     }
-    CNode* pnode = new CNode(id, nodeServices, GetBestHeight(), hSocket, addr, CalculateKeyedNetGroup(addr), nonce, addr_bind, "", true);
+    CNode* pnode = new CNode(id, nodeServices, GetBestHeight(), hSocket, addr, CalculateKeyedNetGroup(addr), nonce, addr_bind, "", ConnectionType::INBOUND);
     pnode->AddRef();
     pnode->m_permissionFlags = permissionFlags;
     // If this flag is present, the user probably expect that RPC and QT report it as whitelisted (backward compatibility)
@@ -1646,7 +1648,7 @@ void CConnman::ThreadDNSAddressSeed()
                     {
                         LOCK(cs_vNodes);
                         for (const CNode* pnode : vNodes) {
-                            nRelevant += pnode->fSuccessfullyConnected && !pnode->fFeeler && !pnode->fOneShot && !pnode->m_manual_connection && !pnode->fInbound;
+                            if (pnode->fSuccessfullyConnected && pnode->IsOutboundOrBlockRelayConn()) ++nRelevant;
                         }
                     }
                     if (nRelevant >= 2) {
@@ -1674,7 +1676,7 @@ void CConnman::ThreadDNSAddressSeed()
 
         LogPrintf("Loading addresses from DNS seed %s\n", seed);
         if (HaveNameProxy()) {
-            AddOneShot(seed);
+            AddAddrFetch(seed);
         } else {
             std::vector<CNetAddr> vIPs;
             std::vector<CAddress> vAdd;
@@ -1696,8 +1698,8 @@ void CConnman::ThreadDNSAddressSeed()
                 addrman.Add(vAdd, resolveSource);
             } else {
                 // We now avoid directly using results from DNS Seeds which do not support service bit filtering,
-                // instead using them as a oneshot to get nodes with our desired service bits.
-                AddOneShot(seed);
+                // instead using them as a addrfetch to get nodes with our desired service bits.
+                AddAddrFetch(seed);
             }
         }
         --seeds_right_now;
@@ -1705,17 +1707,6 @@ void CConnman::ThreadDNSAddressSeed()
     LogPrintf("%d addresses found from DNS seeds\n", found);
 }
 
-
-
-
-
-
-
-
-
-
-
-
 void CConnman::DumpAddresses()
 {
     int64_t nStart = GetTimeMillis();
@@ -1727,20 +1718,20 @@ void CConnman::DumpAddresses()
            addrman.size(), GetTimeMillis() - nStart);
 }
 
-void CConnman::ProcessOneShot()
+void CConnman::ProcessAddrFetch()
 {
     std::string strDest;
     {
-        LOCK(cs_vOneShots);
-        if (vOneShots.empty())
+        LOCK(m_addr_fetches_mutex);
+        if (m_addr_fetches.empty())
             return;
-        strDest = vOneShots.front();
-        vOneShots.pop_front();
+        strDest = m_addr_fetches.front();
+        m_addr_fetches.pop_front();
     }
     CAddress addr;
     CSemaphoreGrant grant(*semOutbound, true);
     if (grant) {
-        OpenNetworkConnection(addr, false, &grant, strDest.c_str(), true);
+        OpenNetworkConnection(addr, false, &grant, strDest.c_str(), ConnectionType::ADDR_FETCH);
     }
 }
 
@@ -1767,7 +1758,7 @@ int CConnman::GetExtraOutboundCount()
     {
         LOCK(cs_vNodes);
         for (const CNode* pnode : vNodes) {
-            if (!pnode->fInbound && !pnode->m_manual_connection && !pnode->fFeeler && !pnode->fDisconnect && !pnode->fOneShot && pnode->fSuccessfullyConnected) {
+            if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsOutboundOrBlockRelayConn()) {
                 ++nOutbound;
             }
         }
@@ -1782,11 +1773,11 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
     {
         for (int64_t nLoop = 0;; nLoop++)
         {
-            ProcessOneShot();
+            ProcessAddrFetch();
             for (const std::string& strAddr : connect)
             {
                 CAddress addr(CService(), NODE_NONE);
-                OpenNetworkConnection(addr, false, nullptr, strAddr.c_str(), false, false, true);
+                OpenNetworkConnection(addr, false, nullptr, strAddr.c_str(), ConnectionType::MANUAL);
                 for (int i = 0; i < 10 && i < nLoop; i++)
                 {
                     if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
@@ -1805,7 +1796,7 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
     int64_t nNextFeeler = PoissonNextSend(nStart*1000*1000, FEELER_INTERVAL);
     while (!interruptNet)
     {
-        ProcessOneShot();
+        ProcessAddrFetch();
 
         if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
             return;
@@ -1838,21 +1829,27 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
         int nOutboundFullRelay = 0;
         int nOutboundBlockRelay = 0;
         std::set<std::vector<unsigned char> > setConnected;
+
         {
             LOCK(cs_vNodes);
             for (const CNode* pnode : vNodes) {
-                if (!pnode->fInbound && !pnode->m_manual_connection) {
-                    // Netgroups for inbound and addnode peers are not excluded because our goal here
-                    // is to not use multiple of our limited outbound slots on a single netgroup
-                    // but inbound and addnode peers do not use our outbound slots.  Inbound peers
-                    // also have the added issue that they're attacker controlled and could be used
-                    // to prevent us from connecting to particular hosts if we used them here.
-                    setConnected.insert(pnode->addr.GetGroup(addrman.m_asmap));
-                    if (pnode->m_tx_relay == nullptr) {
-                        nOutboundBlockRelay++;
-                    } else if (!pnode->fFeeler) {
-                        nOutboundFullRelay++;
-                    }
+                if (pnode->IsFullOutboundConn()) nOutboundFullRelay++;
+                if (pnode->IsBlockOnlyConn()) nOutboundBlockRelay++;
+
+                // Netgroups for inbound and manual peers are not excluded because our goal here
+                // is to not use multiple of our limited outbound slots on a single netgroup
+                // but inbound and manual peers do not use our outbound slots. Inbound peers
+                // also have the added issue that they could be attacker controlled and used
+                // to prevent us from connecting to particular hosts if we used them here.
+                switch(pnode->m_conn_type){
+                    case ConnectionType::INBOUND:
+                    case ConnectionType::MANUAL:
+                        break;
+                    case ConnectionType::OUTBOUND:
+                    case ConnectionType::BLOCK_RELAY:
+                    case ConnectionType::ADDR_FETCH:
+                    case ConnectionType::FEELER:
+                        setConnected.insert(pnode->addr.GetGroup(addrman.m_asmap));
                 }
             }
         }
@@ -1945,14 +1942,24 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
                 LogPrint(BCLog::NET, "Making feeler connection to %s\n", addrConnect.ToString());
             }
 
-            // Open this connection as block-relay-only if we're already at our
-            // full-relay capacity, but not yet at our block-relay peer limit.
-            // (It should not be possible for fFeeler to be set if we're not
-            // also at our block-relay peer limit, but check against that as
-            // well for sanity.)
-            bool block_relay_only = nOutboundBlockRelay < m_max_outbound_block_relay && !fFeeler && nOutboundFullRelay >= m_max_outbound_full_relay;
+            ConnectionType conn_type;
+            // Determine what type of connection to open. If fFeeler is not
+            // set, open OUTBOUND connections until we meet our full-relay
+            // capacity. Then open BLOCK_RELAY connections until we hit our
+            // block-relay peer limit. Otherwise, default to opening an
+            // OUTBOUND connection.
+            if (fFeeler) {
+                conn_type = ConnectionType::FEELER;
+            } else if (nOutboundFullRelay < m_max_outbound_full_relay) {
+                conn_type = ConnectionType::OUTBOUND;
+            } else if (nOutboundBlockRelay < m_max_outbound_block_relay) {
+                conn_type = ConnectionType::BLOCK_RELAY;
+            } else {
+                // GetTryNewOutboundPeer() is true
+                conn_type = ConnectionType::OUTBOUND;
+            }
 
-            OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant, nullptr, false, fFeeler, false, block_relay_only);
+            OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant, nullptr, conn_type);
         }
     }
 }
@@ -1976,11 +1983,11 @@ std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo()
         LOCK(cs_vNodes);
         for (const CNode* pnode : vNodes) {
             if (pnode->addr.IsValid()) {
-                mapConnected[pnode->addr] = pnode->fInbound;
+                mapConnected[pnode->addr] = pnode->IsInboundConn();
             }
             std::string addrName = pnode->GetAddrName();
             if (!addrName.empty()) {
-                mapConnectedByName[std::move(addrName)] = std::make_pair(pnode->fInbound, static_cast<const CService&>(pnode->addr));
+                mapConnectedByName[std::move(addrName)] = std::make_pair(pnode->IsInboundConn(), static_cast<const CService&>(pnode->addr));
             }
         }
     }
@@ -2027,7 +2034,7 @@ void CConnman::ThreadOpenAddedConnections()
                 }
                 tried = true;
                 CAddress addr(CService(), NODE_NONE);
-                OpenNetworkConnection(addr, false, &grant, info.strAddedNode.c_str(), false, false, true);
+                OpenNetworkConnection(addr, false, &grant, info.strAddedNode.c_str(), ConnectionType::MANUAL);
                 if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
                     return;
             }
@@ -2039,8 +2046,10 @@ void CConnman::ThreadOpenAddedConnections()
 }
 
 // if successful, this moves the passed grant to the constructed node
-void CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot, bool fFeeler, bool manual_connection, bool block_relay_only)
+void CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, ConnectionType conn_type)
 {
+    assert(conn_type != ConnectionType::INBOUND);
+
     //
     // Initiate outbound network connection
     //
@@ -2058,18 +2067,12 @@ void CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
     } else if (FindNode(std::string(pszDest)))
         return;
 
-    CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure, manual_connection, block_relay_only);
+    CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure, conn_type);
 
     if (!pnode)
         return;
     if (grantOutbound)
         grantOutbound->MoveTo(pnode->grantOutbound);
-    if (fOneShot)
-        pnode->fOneShot = true;
-    if (fFeeler)
-        pnode->fFeeler = true;
-    if (manual_connection)
-        pnode->m_manual_connection = true;
 
     m_msgproc->InitializeNode(pnode);
     {
@@ -2127,11 +2130,6 @@ void CConnman::ThreadMessageHandler()
     }
 }
 
-
-
-
-
-
 bool CConnman::BindListenPort(const CService& addrBind, bilingual_str& strError, NetPermissionFlags permissions)
 {
     int nOne = 1;
@@ -2337,7 +2335,7 @@ bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
     }
 
     for (const auto& strDest : connOptions.vSeedNodes) {
-        AddOneShot(strDest);
+        AddAddrFetch(strDest);
     }
 
     if (clientInterface) {
@@ -2390,7 +2388,7 @@ bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
     else
         threadDNSAddressSeed = std::thread(&TraceThread<std::function<void()> >, "dnsseed", std::function<void()>(std::bind(&CConnman::ThreadDNSAddressSeed, this)));
 
-    // Initiate outbound connections from -addnode
+    // Initiate manual connections
     threadOpenAddedConnections = std::thread(&TraceThread<std::function<void()> >, "addcon", std::function<void()>(std::bind(&CConnman::ThreadOpenAddedConnections, this)));
 
     if (connOptions.m_use_addrman_outgoing && !connOptions.m_specified_outgoing.empty()) {
@@ -2581,7 +2579,7 @@ size_t CConnman::GetNodeCount(NumConnections flags)
 
     int nNum = 0;
     for (const auto& pnode : vNodes) {
-        if (flags & (pnode->fInbound ? CONNECTIONS_IN : CONNECTIONS_OUT)) {
+        if (flags & (pnode->IsInboundConn() ? CONNECTIONS_IN : CONNECTIONS_OUT)) {
             nNum++;
         }
     }
@@ -2765,26 +2763,26 @@ int CConnman::GetBestHeight() const
 
 unsigned int CConnman::GetReceiveFloodSize() const { return nReceiveFloodSize; }
 
-CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress& addrIn, uint64_t nKeyedNetGroupIn, uint64_t nLocalHostNonceIn, const CAddress& addrBindIn, const std::string& addrNameIn, bool fInboundIn, bool block_relay_only)
+CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress& addrIn, uint64_t nKeyedNetGroupIn, uint64_t nLocalHostNonceIn, const CAddress& addrBindIn, const std::string& addrNameIn, ConnectionType conn_type_in)
     : nTimeConnected(GetSystemTimeInSeconds()),
     addr(addrIn),
     addrBind(addrBindIn),
-    fInbound(fInboundIn),
     nKeyedNetGroup(nKeyedNetGroupIn),
     // Don't relay addr messages to peers that we connect to as block-relay-only
     // peers (to prevent adversaries from inferring these links from addr
     // traffic).
-    m_addr_known{block_relay_only ? nullptr : MakeUnique<CRollingBloomFilter>(5000, 0.001)},
     id(idIn),
     nLocalHostNonce(nLocalHostNonceIn),
+    m_conn_type(conn_type_in),
     nLocalServices(nLocalServicesIn),
     nMyStartingHeight(nMyStartingHeightIn)
 {
     hSocket = hSocketIn;
     addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
     hashContinue = uint256();
-    if (!block_relay_only) {
+    if (conn_type_in != ConnectionType::BLOCK_RELAY) {
         m_tx_relay = MakeUnique<TxRelay>();
+        m_addr_known = MakeUnique<CRollingBloomFilter>(5000, 0.001);
     }
 
     for (const std::string &msg : getAllNetMessageTypes())
diff --git a/src/net.h b/src/net.h
index 1c558ee810..f23878cd0c 100644
--- a/src/net.h
+++ b/src/net.h
@@ -117,6 +117,17 @@ struct CSerializedNetMsg
     std::string m_type;
 };
 
+/** Different types of connections to a peer. This enum encapsulates the
+ * information we have available at the time of opening or accepting the
+ * connection. Aside from INBOUND, all types are initiated by us. */
+enum class ConnectionType {
+    INBOUND, /**< peer initiated connections */
+    OUTBOUND, /**< full relay connections (blocks, addrs, txns) made automatically. Addresses selected from AddrMan. */
+    MANUAL, /**< connections to addresses added via addnode or the connect command line argument */
+    FEELER, /**< short lived connections used to test address validity */
+    BLOCK_RELAY, /**< only relay blocks to these automatic outbound connections. Addresses selected from AddrMan. */
+    ADDR_FETCH, /**< short lived connections used to solicit addrs when starting the node without a populated AddrMan */
+};
 
 class NetEventsInterface;
 class CConnman
@@ -201,7 +212,7 @@ public:
     bool GetNetworkActive() const { return fNetworkActive; };
     bool GetUseAddrmanOutgoing() const { return m_use_addrman_outgoing; };
     void SetNetworkActive(bool active);
-    void OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = nullptr, const char *strDest = nullptr, bool fOneShot = false, bool fFeeler = false, bool manual_connection = false, bool block_relay_only = false);
+    void OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = nullptr, const char *strDest = nullptr, ConnectionType conn_type = ConnectionType::OUTBOUND);
     bool CheckIncomingNonce(uint64_t nonce);
 
     bool ForNode(NodeId id, std::function<bool(CNode* pnode)> func);
@@ -351,8 +362,8 @@ private:
     bool Bind(const CService& addr, unsigned int flags, NetPermissionFlags permissions);
     bool InitBinds(const std::vector<CService>& binds, const std::vector<NetWhitebindPermissions>& whiteBinds);
     void ThreadOpenAddedConnections();
-    void AddOneShot(const std::string& strDest);
-    void ProcessOneShot();
+    void AddAddrFetch(const std::string& strDest);
+    void ProcessAddrFetch();
     void ThreadOpenConnections(std::vector<std::string> connect);
     void ThreadMessageHandler();
     void AcceptConnection(const ListenSocket& hListenSocket);
@@ -373,7 +384,7 @@ private:
     CNode* FindNode(const CService& addr);
 
     bool AttemptToEvictConnection();
-    CNode* ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, bool manual_connection, bool block_relay_only);
+    CNode* ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, ConnectionType conn_type);
     void AddWhitelistPermissionFlags(NetPermissionFlags& flags, const CNetAddr &addr) const;
 
     void DeleteNode(CNode* pnode);
@@ -416,8 +427,8 @@ private:
     std::atomic<bool> fNetworkActive{true};
     bool fAddressesInitialized{false};
     CAddrMan addrman;
-    std::deque<std::string> vOneShots GUARDED_BY(cs_vOneShots);
-    RecursiveMutex cs_vOneShots;
+    std::deque<std::string> m_addr_fetches GUARDED_BY(m_addr_fetches_mutex);
+    RecursiveMutex m_addr_fetches_mutex;
     std::vector<std::string> vAddedNodes GUARDED_BY(cs_vAddedNodes);
     RecursiveMutex cs_vAddedNodes;
     std::vector<CNode*> vNodes GUARDED_BY(cs_vNodes);
@@ -798,12 +809,8 @@ public:
     }
     // This boolean is unusued in actual processing, only present for backward compatibility at RPC/QT level
     bool m_legacyWhitelisted{false};
-    bool fFeeler{false}; // If true this node is being used as a short lived feeler.
-    bool fOneShot{false};
-    bool m_manual_connection{false};
     bool fClient{false}; // set by version message
     bool m_limited_node{false}; //after BIP159, set by version message
-    const bool fInbound;
     std::atomic_bool fSuccessfullyConnected{false};
     // Setting fDisconnect to true will cause the node to be disconnected the
     // next time DisconnectNodes() runs
@@ -816,6 +823,60 @@ public:
     std::atomic_bool fPauseRecv{false};
     std::atomic_bool fPauseSend{false};
 
+    bool IsOutboundOrBlockRelayConn() const {
+        switch(m_conn_type) {
+            case ConnectionType::OUTBOUND:
+            case ConnectionType::BLOCK_RELAY:
+                return true;
+            case ConnectionType::INBOUND:
+            case ConnectionType::MANUAL:
+            case ConnectionType::ADDR_FETCH:
+            case ConnectionType::FEELER:
+                return false;
+        }
+
+        assert(false);
+    }
+
+    bool IsFullOutboundConn() const {
+        return m_conn_type == ConnectionType::OUTBOUND;
+    }
+
+    bool IsManualConn() const {
+        return m_conn_type == ConnectionType::MANUAL;
+    }
+
+    bool IsBlockOnlyConn() const {
+        return m_conn_type == ConnectionType::BLOCK_RELAY;
+    }
+
+    bool IsFeelerConn() const {
+        return m_conn_type == ConnectionType::FEELER;
+    }
+
+    bool IsAddrFetchConn() const {
+        return m_conn_type == ConnectionType::ADDR_FETCH;
+    }
+
+    bool IsInboundConn() const {
+        return m_conn_type == ConnectionType::INBOUND;
+    }
+
+    bool ExpectServicesFromConn() const {
+        switch(m_conn_type) {
+            case ConnectionType::INBOUND:
+            case ConnectionType::MANUAL:
+            case ConnectionType::FEELER:
+                return false;
+            case ConnectionType::OUTBOUND:
+            case ConnectionType::BLOCK_RELAY:
+            case ConnectionType::ADDR_FETCH:
+                return true;
+        }
+
+        assert(false);
+    }
+
 protected:
     mapMsgCmdSize mapSendBytesPerMsgCmd;
     mapMsgCmdSize mapRecvBytesPerMsgCmd GUARDED_BY(cs_vRecv);
@@ -826,7 +887,7 @@ public:
 
     // flood relay
     std::vector<CAddress> vAddrToSend;
-    const std::unique_ptr<CRollingBloomFilter> m_addr_known;
+    std::unique_ptr<CRollingBloomFilter> m_addr_known = nullptr;
     bool fGetAddr{false};
     std::chrono::microseconds m_next_addr_send GUARDED_BY(cs_sendProcessing){0};
     std::chrono::microseconds m_next_local_addr_send GUARDED_BY(cs_sendProcessing){0};
@@ -890,7 +951,7 @@ public:
 
     std::set<uint256> orphan_work_set;
 
-    CNode(NodeId id, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress &addrIn, uint64_t nKeyedNetGroupIn, uint64_t nLocalHostNonceIn, const CAddress &addrBindIn, const std::string &addrNameIn = "", bool fInboundIn = false, bool block_relay_only = false);
+    CNode(NodeId id, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress &addrIn, uint64_t nKeyedNetGroupIn, uint64_t nLocalHostNonceIn, const CAddress &addrBindIn, const std::string &addrNameIn, ConnectionType conn_type_in);
     ~CNode();
     CNode(const CNode&) = delete;
     CNode& operator=(const CNode&) = delete;
@@ -898,6 +959,7 @@ public:
 private:
     const NodeId id;
     const uint64_t nLocalHostNonce;
+    const ConnectionType m_conn_type;
 
     //! Services offered to this peer.
     //!
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 7c2d7335a0..7188bd2154 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -479,7 +479,7 @@ static void UpdatePreferredDownload(const CNode& node, CNodeState* state) EXCLUS
     nPreferredDownload -= state->fPreferredDownload;
 
     // Whether this node should be marked as a preferred download node.
-    state->fPreferredDownload = (!node.fInbound || node.HasPermission(PF_NOBAN)) && !node.fOneShot && !node.fClient;
+    state->fPreferredDownload = (!node.IsInboundConn() || node.HasPermission(PF_NOBAN)) && !node.IsAddrFetchConn() && !node.fClient;
 
     nPreferredDownload += state->fPreferredDownload;
 }
@@ -833,22 +833,15 @@ void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds)
     if (state) state->m_last_block_announcement = time_in_seconds;
 }
 
-// Returns true for outbound peers, excluding manual connections, feelers, and
-// one-shots.
-static bool IsOutboundDisconnectionCandidate(const CNode& node)
-{
-    return !(node.fInbound || node.m_manual_connection || node.fFeeler || node.fOneShot);
-}
-
 void PeerLogicValidation::InitializeNode(CNode *pnode) {
     CAddress addr = pnode->addr;
     std::string addrName = pnode->GetAddrName();
     NodeId nodeid = pnode->GetId();
     {
         LOCK(cs_main);
-        mapNodeState.emplace_hint(mapNodeState.end(), std::piecewise_construct, std::forward_as_tuple(nodeid), std::forward_as_tuple(addr, std::move(addrName), pnode->fInbound, pnode->m_manual_connection));
+        mapNodeState.emplace_hint(mapNodeState.end(), std::piecewise_construct, std::forward_as_tuple(nodeid), std::forward_as_tuple(addr, std::move(addrName), pnode->IsInboundConn(), pnode->IsManualConn()));
     }
-    if(!pnode->fInbound)
+    if(!pnode->IsInboundConn())
         PushNodeVersion(*pnode, *connman, GetTime());
 }
 
@@ -1982,14 +1975,14 @@ static void ProcessHeadersMessage(CNode& pfrom, CConnman& connman, ChainstateMan
                 // until we have a headers chain that has at least
                 // nMinimumChainWork, even if a peer has a chain past our tip,
                 // as an anti-DoS measure.
-                if (IsOutboundDisconnectionCandidate(pfrom)) {
+                if (pfrom.IsOutboundOrBlockRelayConn()) {
                     LogPrintf("Disconnecting outbound peer %d -- headers chain has insufficient work\n", pfrom.GetId());
                     pfrom.fDisconnect = true;
                 }
             }
         }
 
-        if (!pfrom.fDisconnect && IsOutboundDisconnectionCandidate(pfrom) && nodestate->pindexBestKnownBlock != nullptr && pfrom.m_tx_relay != nullptr) {
+        if (!pfrom.fDisconnect && pfrom.IsOutboundOrBlockRelayConn() && nodestate->pindexBestKnownBlock != nullptr && pfrom.m_tx_relay != nullptr) {
             // If this is an outbound full-relay peer, check to see if we should protect
             // it from the bad/lagging chain logic.
             // Note that block-relay-only peers are already implicitly protected, so we
@@ -2352,11 +2345,11 @@ void ProcessMessage(
         vRecv >> nVersion >> nServiceInt >> nTime >> addrMe;
         nSendVersion = std::min(nVersion, PROTOCOL_VERSION);
         nServices = ServiceFlags(nServiceInt);
-        if (!pfrom.fInbound)
+        if (!pfrom.IsInboundConn())
         {
             connman.SetServices(pfrom.addr, nServices);
         }
-        if (!pfrom.fInbound && !pfrom.fFeeler && !pfrom.m_manual_connection && !HasAllDesirableServiceFlags(nServices))
+        if (pfrom.ExpectServicesFromConn() && !HasAllDesirableServiceFlags(nServices))
         {
             LogPrint(BCLog::NET, "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom.GetId(), nServices, GetDesirableServiceFlags(nServices));
             pfrom.fDisconnect = true;
@@ -2383,20 +2376,20 @@ void ProcessMessage(
         if (!vRecv.empty())
             vRecv >> fRelay;
         // Disconnect if we connected to ourself
-        if (pfrom.fInbound && !connman.CheckIncomingNonce(nNonce))
+        if (pfrom.IsInboundConn() && !connman.CheckIncomingNonce(nNonce))
         {
             LogPrintf("connected to self at %s, disconnecting\n", pfrom.addr.ToString());
             pfrom.fDisconnect = true;
             return;
         }
 
-        if (pfrom.fInbound && addrMe.IsRoutable())
+        if (pfrom.IsInboundConn() && addrMe.IsRoutable())
         {
             SeenLocal(addrMe);
         }
 
         // Be shy and don't send version until we hear
-        if (pfrom.fInbound)
+        if (pfrom.IsInboundConn())
             PushNodeVersion(pfrom, connman, GetAdjustedTime());
 
         if (nVersion >= WTXID_RELAY_VERSION) {
@@ -2440,7 +2433,7 @@ void ProcessMessage(
         UpdatePreferredDownload(pfrom, State(pfrom.GetId()));
         }
 
-        if (!pfrom.fInbound && pfrom.IsAddrRelayPeer())
+        if (!pfrom.IsInboundConn() && pfrom.IsAddrRelayPeer())
         {
             // Advertise our address
             if (fListen && !::ChainstateActive().IsInitialBlockDownload())
@@ -2484,8 +2477,7 @@ void ProcessMessage(
         }
 
         // Feeler connections exist only to verify if address is online.
-        if (pfrom.fFeeler) {
-            assert(pfrom.fInbound == false);
+        if (pfrom.IsFeelerConn()) {
             pfrom.fDisconnect = true;
         }
         return;
@@ -2505,7 +2497,7 @@ void ProcessMessage(
     {
         pfrom.SetRecvVersion(std::min(pfrom.nVersion.load(), PROTOCOL_VERSION));
 
-        if (!pfrom.fInbound) {
+        if (!pfrom.IsInboundConn()) {
             // Mark this node as currently connected, so we update its timestamp later.
             LOCK(cs_main);
             State(pfrom.GetId())->fCurrentlyConnected = true;
@@ -2614,7 +2606,7 @@ void ProcessMessage(
         connman.AddNewAddresses(vAddrOk, pfrom.addr, 2 * 60 * 60);
         if (vAddr.size() < 1000)
             pfrom.fGetAddr = false;
-        if (pfrom.fOneShot)
+        if (pfrom.IsAddrFetchConn())
             pfrom.fDisconnect = true;
         return;
     }
@@ -3509,7 +3501,7 @@ void ProcessMessage(
         // to users' AddrMan and later request them by sending getaddr messages.
         // Making nodes which are behind NAT and can only make outgoing connections ignore
         // the getaddr message mitigates the attack.
-        if (!pfrom.fInbound) {
+        if (!pfrom.IsInboundConn()) {
             LogPrint(BCLog::NET, "Ignoring \"getaddr\" from outbound connection. peer=%d\n", pfrom.GetId());
             return;
         }
@@ -3792,7 +3784,7 @@ bool PeerLogicValidation::MaybeDiscourageAndDisconnect(CNode& pnode)
         return false;
     }
 
-    if (pnode.m_manual_connection) {
+    if (pnode.IsManualConn()) {
         // We never disconnect or discourage manual peers for bad behavior
         LogPrintf("Warning: not punishing manually connected peer %d!\n", peer_id);
         return false;
@@ -3913,7 +3905,7 @@ void PeerLogicValidation::ConsiderEviction(CNode& pto, int64_t time_in_seconds)
     CNodeState &state = *State(pto.GetId());
     const CNetMsgMaker msgMaker(pto.GetSendVersion());
 
-    if (!state.m_chain_sync.m_protect && IsOutboundDisconnectionCandidate(pto) && state.fSyncStarted) {
+    if (!state.m_chain_sync.m_protect && pto.IsOutboundOrBlockRelayConn() && state.fSyncStarted) {
         // This is an outbound peer subject to disconnection if they don't
         // announce a block with as much work as the current tip within
         // CHAIN_SYNC_TIMEOUT + HEADERS_RESPONSE_TIME seconds (note: if
@@ -3975,7 +3967,7 @@ void PeerLogicValidation::EvictExtraOutboundPeers(int64_t time_in_seconds)
             AssertLockHeld(cs_main);
 
             // Ignore non-outbound peers, or nodes marked for disconnect already
-            if (!IsOutboundDisconnectionCandidate(*pnode) || pnode->fDisconnect) return;
+            if (!pnode->IsOutboundOrBlockRelayConn() || pnode->fDisconnect) return;
             CNodeState *state = State(pnode->GetId());
             if (state == nullptr) return; // shouldn't be possible, but just in case
             // Don't evict our protected peers
@@ -4153,7 +4145,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
         // Start block sync
         if (pindexBestHeader == nullptr)
             pindexBestHeader = ::ChainActive().Tip();
-        bool fFetch = state.fPreferredDownload || (nPreferredDownload == 0 && !pto->fClient && !pto->fOneShot); // Download if this is a nice peer, or we have no nice peers and this one might do.
+        bool fFetch = state.fPreferredDownload || (nPreferredDownload == 0 && !pto->fClient && !pto->IsAddrFetchConn()); // Download if this is a nice peer, or we have no nice peers and this one might do.
         if (!state.fSyncStarted && !pto->fClient && !fImporting && !fReindex) {
             // Only actively request headers from a single peer, unless we're close to today.
             if ((nSyncStarted == 0 && fFetch) || pindexBestHeader->GetBlockTime() > GetAdjustedTime() - 24 * 60 * 60) {
@@ -4338,7 +4330,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
                 bool fSendTrickle = pto->HasPermission(PF_NOBAN);
                 if (pto->m_tx_relay->nNextInvSend < current_time) {
                     fSendTrickle = true;
-                    if (pto->fInbound) {
+                    if (pto->IsInboundConn()) {
                         pto->m_tx_relay->nNextInvSend = std::chrono::microseconds{connman->PoissonNextSendInbound(nNow, INVENTORY_BROADCAST_INTERVAL)};
                     } else {
                         // Use half the delay for outbound peers, as there is less privacy concern for them.
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index 9981ea35df..09265bc480 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -264,7 +264,7 @@ static UniValue addnode(const JSONRPCRequest& request)
     if (strCommand == "onetry")
     {
         CAddress addr;
-        node.connman->OpenNetworkConnection(addr, false, nullptr, strNode.c_str(), false, false, true);
+        node.connman->OpenNetworkConnection(addr, false, nullptr, strNode.c_str(), ConnectionType::MANUAL);
         return NullUniValue;
     }
 
diff --git a/src/test/denialofservice_tests.cpp b/src/test/denialofservice_tests.cpp
index b1a635d9da..0115803e58 100644
--- a/src/test/denialofservice_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -84,7 +84,7 @@ BOOST_AUTO_TEST_CASE(outbound_slow_chain_eviction)
 
     // Mock an outbound peer
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
-    CNode dummyNode1(id++, ServiceFlags(NODE_NETWORK|NODE_WITNESS), 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", /*fInboundIn=*/ false);
+    CNode dummyNode1(id++, ServiceFlags(NODE_NETWORK|NODE_WITNESS), 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", ConnectionType::OUTBOUND);
     dummyNode1.SetSendVersion(PROTOCOL_VERSION);
 
     peerLogic->InitializeNode(&dummyNode1);
@@ -136,7 +136,7 @@ BOOST_AUTO_TEST_CASE(outbound_slow_chain_eviction)
 static void AddRandomOutboundPeer(std::vector<CNode *> &vNodes, PeerLogicValidation &peerLogic, CConnmanTest* connman)
 {
     CAddress addr(ip(g_insecure_rand_ctx.randbits(32)), NODE_NONE);
-    vNodes.emplace_back(new CNode(id++, ServiceFlags(NODE_NETWORK|NODE_WITNESS), 0, INVALID_SOCKET, addr, 0, 0, CAddress(), "", /*fInboundIn=*/ false));
+    vNodes.emplace_back(new CNode(id++, ServiceFlags(NODE_NETWORK|NODE_WITNESS), 0, INVALID_SOCKET, addr, 0, 0, CAddress(), "", ConnectionType::OUTBOUND));
     CNode &node = *vNodes.back();
     node.SetSendVersion(PROTOCOL_VERSION);
 
@@ -227,7 +227,7 @@ BOOST_AUTO_TEST_CASE(peer_discouragement)
 
     banman->ClearBanned();
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
-    CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", true);
+    CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 0, 0, CAddress(), "", ConnectionType::INBOUND);
     dummyNode1.SetSendVersion(PROTOCOL_VERSION);
     peerLogic->InitializeNode(&dummyNode1);
     dummyNode1.nVersion = 1;
@@ -244,7 +244,7 @@ BOOST_AUTO_TEST_CASE(peer_discouragement)
     BOOST_CHECK(!banman->IsDiscouraged(ip(0xa0b0c001|0x0000ff00))); // Different IP, not discouraged
 
     CAddress addr2(ip(0xa0b0c002), NODE_NONE);
-    CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, 1, 1, CAddress(), "", true);
+    CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, 1, 1, CAddress(), "", ConnectionType::INBOUND);
     dummyNode2.SetSendVersion(PROTOCOL_VERSION);
     peerLogic->InitializeNode(&dummyNode2);
     dummyNode2.nVersion = 1;
@@ -286,7 +286,7 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
     SetMockTime(nStartTime); // Overrides future calls to GetTime()
 
     CAddress addr(ip(0xa0b0c001), NODE_NONE);
-    CNode dummyNode(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr, 4, 4, CAddress(), "", true);
+    CNode dummyNode(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr, 4, 4, CAddress(), "", ConnectionType::INBOUND);
     dummyNode.SetSendVersion(PROTOCOL_VERSION);
     peerLogic->InitializeNode(&dummyNode);
     dummyNode.nVersion = 1;
diff --git a/src/test/fuzz/process_message.cpp b/src/test/fuzz/process_message.cpp
index 9e40d5cd55..677b87a47a 100644
--- a/src/test/fuzz/process_message.cpp
+++ b/src/test/fuzz/process_message.cpp
@@ -80,7 +80,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
         return;
     }
     CDataStream random_bytes_data_stream{fuzzed_data_provider.ConsumeRemainingBytes<unsigned char>(), SER_NETWORK, PROTOCOL_VERSION};
-    CNode& p2p_node = *MakeUnique<CNode>(0, ServiceFlags(NODE_NETWORK | NODE_WITNESS | NODE_BLOOM), 0, INVALID_SOCKET, CAddress{CService{in_addr{0x0100007f}, 7777}, NODE_NETWORK}, 0, 0, CAddress{}, std::string{}, false).release();
+    CNode& p2p_node = *MakeUnique<CNode>(0, ServiceFlags(NODE_NETWORK | NODE_WITNESS | NODE_BLOOM), 0, INVALID_SOCKET, CAddress{CService{in_addr{0x0100007f}, 7777}, NODE_NETWORK}, 0, 0, CAddress{}, std::string{}, ConnectionType::OUTBOUND).release();
     p2p_node.fSuccessfullyConnected = true;
     p2p_node.nVersion = PROTOCOL_VERSION;
     p2p_node.SetSendVersion(PROTOCOL_VERSION);
diff --git a/src/test/fuzz/process_messages.cpp b/src/test/fuzz/process_messages.cpp
index 91ebf9fb1b..ef427442e9 100644
--- a/src/test/fuzz/process_messages.cpp
+++ b/src/test/fuzz/process_messages.cpp
@@ -44,9 +44,8 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     const auto num_peers_to_add = fuzzed_data_provider.ConsumeIntegralInRange(1, 3);
     for (int i = 0; i < num_peers_to_add; ++i) {
         const ServiceFlags service_flags = ServiceFlags(fuzzed_data_provider.ConsumeIntegral<uint64_t>());
-        const bool inbound{fuzzed_data_provider.ConsumeBool()};
-        const bool block_relay_only{fuzzed_data_provider.ConsumeBool()};
-        peers.push_back(MakeUnique<CNode>(i, service_flags, 0, INVALID_SOCKET, CAddress{CService{in_addr{0x0100007f}, 7777}, NODE_NETWORK}, 0, 0, CAddress{}, std::string{}, inbound, block_relay_only).release());
+        const ConnectionType conn_type = fuzzed_data_provider.PickValueInArray({ConnectionType::INBOUND, ConnectionType::OUTBOUND, ConnectionType::MANUAL, ConnectionType::FEELER, ConnectionType::BLOCK_RELAY, ConnectionType::ADDR_FETCH});
+        peers.push_back(MakeUnique<CNode>(i, service_flags, 0, INVALID_SOCKET, CAddress{CService{in_addr{0x0100007f}, 7777}, NODE_NETWORK}, 0, 0, CAddress{}, std::string{}, conn_type).release());
         CNode& p2p_node = *peers.back();
 
         p2p_node.fSuccessfullyConnected = true;
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
index ab42be21bd..317000c771 100644
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -180,17 +180,12 @@ BOOST_AUTO_TEST_CASE(cnode_simple_test)
 
     CAddress addr = CAddress(CService(ipv4Addr, 7777), NODE_NETWORK);
     std::string pszDest;
-    bool fInboundIn = false;
 
-    // Test that fFeeler is false by default.
-    std::unique_ptr<CNode> pnode1 = MakeUnique<CNode>(id++, NODE_NETWORK, height, hSocket, addr, 0, 0, CAddress(), pszDest, fInboundIn);
-    BOOST_CHECK(pnode1->fInbound == false);
-    BOOST_CHECK(pnode1->fFeeler == false);
+    std::unique_ptr<CNode> pnode1 = MakeUnique<CNode>(id++, NODE_NETWORK, height, hSocket, addr, 0, 0, CAddress(), pszDest, ConnectionType::OUTBOUND);
+    BOOST_CHECK(pnode1->IsInboundConn() == false);
 
-    fInboundIn = true;
-    std::unique_ptr<CNode> pnode2 = MakeUnique<CNode>(id++, NODE_NETWORK, height, hSocket, addr, 1, 1, CAddress(), pszDest, fInboundIn);
-    BOOST_CHECK(pnode2->fInbound == true);
-    BOOST_CHECK(pnode2->fFeeler == false);
+    std::unique_ptr<CNode> pnode2 = MakeUnique<CNode>(id++, NODE_NETWORK, height, hSocket, addr, 1, 1, CAddress(), pszDest, ConnectionType::INBOUND);
+    BOOST_CHECK(pnode2->IsInboundConn() == true);
 }
 
 // prior to PR #14728, this test triggers an undefined behavior
@@ -214,7 +209,7 @@ BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test)
     in_addr ipv4AddrPeer;
     ipv4AddrPeer.s_addr = 0xa0b0c001;
     CAddress addr = CAddress(CService(ipv4AddrPeer, 7777), NODE_NETWORK);
-    std::unique_ptr<CNode> pnode = MakeUnique<CNode>(0, NODE_NETWORK, 0, INVALID_SOCKET, addr, 0, 0, CAddress{}, std::string{}, false);
+    std::unique_ptr<CNode> pnode = MakeUnique<CNode>(0, NODE_NETWORK, 0, INVALID_SOCKET, addr, 0, 0, CAddress{}, std::string{}, ConnectionType::OUTBOUND);
     pnode->fSuccessfullyConnected.store(true);
 
     // the peer claims to be reaching us via IPv6