clang

Co-authored-by: Denis Angell <dangell@transia.co>

Builds/CMake/RippledCore.cmake

@@ -392,6 +392,7 @@ target_sources (rippled PRIVATE
   src/ripple/app/misc/NegativeUNLVote.cpp
   src/ripple/app/misc/NetworkOPs.cpp
   src/ripple/app/misc/SHAMapStoreImp.cpp
+  src/ripple/app/misc/StateAccounting.cpp
   src/ripple/app/misc/detail/impl/WorkSSL.cpp
   src/ripple/app/misc/impl/AccountTxPaging.cpp
   src/ripple/app/misc/impl/AmendmentTable.cpp

README.md

@@ -67,5 +67,5 @@ git-subtree. See those directories' README files for more details.
   - [explorer.xahau.network](https://explorer.xahau.network)
 - **Testnet & Faucet**: Test applications and obtain test XAH at [xahau-test.net](https://xahau-test.net) and use the testnet explorer at [explorer.xahau.network](https://explorer.xahau.network).
 - **Supporting Wallets**: A list of wallets that support XAH and Xahau-based assets.
-  - [Xumm](https://xumm.app)
+  - [Xaman](https://xaman.app)
   - [Crossmark](https://crossmark.io)

src/ripple/app/ledger/LedgerMaster.h

@@ -152,6 +152,9 @@ public:
     std::string
     getCompleteLedgers();
 
+    RangeSet<std::uint32_t>
+    getCompleteLedgersRangeSet();
+
     /** Apply held transactions to the open ledger
         This is normally called as we close the ledger.
         The open ledger remains open to handle new transactions

src/ripple/app/ledger/impl/LedgerMaster.cpp

@@ -1714,6 +1714,13 @@ LedgerMaster::getCompleteLedgers()
     return to_string(mCompleteLedgers);
 }
 
+RangeSet<std::uint32_t>
+LedgerMaster::getCompleteLedgersRangeSet()
+{
+    std::lock_guard sl(mCompleteLock);
+    return mCompleteLedgers;
+}
+
 std::optional<NetClock::time_point>
 LedgerMaster::getCloseTimeBySeq(LedgerIndex ledgerIndex)
 {

src/ripple/app/main/Application.cpp

@@ -37,6 +37,7 @@
 #include <ripple/app/main/NodeStoreScheduler.h>
 #include <ripple/app/main/Tuning.h>
 #include <ripple/app/misc/AmendmentTable.h>
+#include <ripple/app/misc/DatagramMonitor.h>
 #include <ripple/app/misc/HashRouter.h>
 #include <ripple/app/misc/LoadFeeTrack.h>
 #include <ripple/app/misc/NetworkOPs.h>
@@ -167,6 +168,8 @@ public:
     std::unique_ptr<Logs> logs_;
     std::unique_ptr<TimeKeeper> timeKeeper_;
 
+    std::unique_ptr<DatagramMonitor> datagram_monitor_;
+
     std::uint64_t const instanceCookie_;
 
     beast::Journal m_journal;
@@ -1523,6 +1526,14 @@ ApplicationImp::setup(boost::program_options::variables_map const& cmdline)
     if (reportingETL_)
         reportingETL_->start();
 
+    // Datagram monitor if applicable
+    if (!config_->standalone() && config_->DATAGRAM_MONITOR != "")
+    {
+        datagram_monitor_ = std::make_unique<DatagramMonitor>(*this);
+        if (datagram_monitor_)
+            datagram_monitor_->start();
+    }
+
     return true;
 }
 

src/ripple/app/misc/NetworkOPs.cpp

@@ -33,6 +33,7 @@
 #include <ripple/app/misc/HashRouter.h>
 #include <ripple/app/misc/LoadFeeTrack.h>
 #include <ripple/app/misc/NetworkOPs.h>
+#include <ripple/app/misc/StateAccounting.h>
 #include <ripple/app/misc/Transaction.h>
 #include <ripple/app/misc/TxQ.h>
 #include <ripple/app/misc/ValidatorKeys.h>
@@ -67,9 +68,9 @@
 #include <ripple/rpc/CTID.h>
 #include <ripple/rpc/DeliveredAmount.h>
 #include <ripple/rpc/impl/RPCHelpers.h>
+#include <ripple/rpc/impl/UDPInfoSub.h>
 #include <boost/asio/ip/host_name.hpp>
 #include <boost/asio/steady_timer.hpp>
-
 #include <exception>
 #include <mutex>
 #include <set>
@@ -116,81 +117,6 @@ class NetworkOPsImp final : public NetworkOPs
         running,
     };
 
-    static std::array<char const*, 5> const states_;
-
-    /**
-     * State accounting records two attributes for each possible server state:
-     * 1) Amount of time spent in each state (in microseconds). This value is
-     *    updated upon each state transition.
-     * 2) Number of transitions to each state.
-     *
-     * This data can be polled through server_info and represented by
-     * monitoring systems similarly to how bandwidth, CPU, and other
-     * counter-based metrics are managed.
-     *
-     * State accounting is more accurate than periodic sampling of server
-     * state. With periodic sampling, it is very likely that state transitions
-     * are missed, and accuracy of time spent in each state is very rough.
-     */
-    class StateAccounting
-    {
-        struct Counters
-        {
-            explicit Counters() = default;
-
-            std::uint64_t transitions = 0;
-            std::chrono::microseconds dur = std::chrono::microseconds(0);
-        };
-
-        OperatingMode mode_ = OperatingMode::DISCONNECTED;
-        std::array<Counters, 5> counters_;
-        mutable std::mutex mutex_;
-        std::chrono::steady_clock::time_point start_ =
-            std::chrono::steady_clock::now();
-        std::chrono::steady_clock::time_point const processStart_ = start_;
-        std::uint64_t initialSyncUs_{0};
-        static std::array<Json::StaticString const, 5> const states_;
-
-    public:
-        explicit StateAccounting()
-        {
-            counters_[static_cast<std::size_t>(OperatingMode::DISCONNECTED)]
-                .transitions = 1;
-        }
-
-        /**
-         * Record state transition. Update duration spent in previous
-         * state.
-         *
-         * @param om New state.
-         */
-        void
-        mode(OperatingMode om);
-
-        /**
-         * Output state counters in JSON format.
-         *
-         * @obj Json object to which to add state accounting data.
-         */
-        void
-        json(Json::Value& obj) const;
-
-        struct CounterData
-        {
-            decltype(counters_) counters;
-            decltype(mode_) mode;
-            decltype(start_) start;
-            decltype(initialSyncUs_) initialSyncUs;
-        };
-
-        CounterData
-        getCounterData() const
-        {
-            std::lock_guard lock(mutex_);
-            return {counters_, mode_, start_, initialSyncUs_};
-        }
-    };
-
     //! Server fees published on `server` subscription
     struct ServerFeeSummary
     {
@@ -272,6 +198,9 @@ public:
     std::string
     strOperatingMode(bool const admin = false) const override;
 
+    StateAccounting::CounterData
+    getStateAccountingData();
+
     //
     // Transaction operations.
     //
@@ -776,11 +705,17 @@ private:
     DispatchState mDispatchState = DispatchState::none;
     std::vector<TransactionStatus> mTransactions;
 
-    StateAccounting accounting_{};
+    StateAccounting accounting_;
 
     std::set<uint256> pendingValidations_;
     std::mutex validationsMutex_;
 
+    RCLConsensus&
+    getConsensus();
+
+    LedgerMaster&
+    getLedgerMaster();
+
 private:
     struct Stats
     {
@@ -843,19 +778,6 @@ private:
 
 //------------------------------------------------------------------------------
 
-static std::array<char const*, 5> const stateNames{
-    {"disconnected", "connected", "syncing", "tracking", "full"}};
-
-std::array<char const*, 5> const NetworkOPsImp::states_ = stateNames;
-
-std::array<Json::StaticString const, 5> const
-    NetworkOPsImp::StateAccounting::states_ = {
-        {Json::StaticString(stateNames[0]),
-         Json::StaticString(stateNames[1]),
-         Json::StaticString(stateNames[2]),
-         Json::StaticString(stateNames[3]),
-         Json::StaticString(stateNames[4])}};
-
 static auto const genesisAccountId = calcAccountID(
     generateKeyPair(KeyType::secp256k1, generateSeed("masterpassphrase"))
         .first);
@@ -1130,7 +1052,7 @@ NetworkOPsImp::strOperatingMode(OperatingMode const mode, bool const admin)
         }
     }
 
-    return states_[static_cast<std::size_t>(mode)];
+    return {StateAccounting::states_[static_cast<std::size_t>(mode)].c_str()};
 }
 
 void
@@ -2396,6 +2318,19 @@ NetworkOPsImp::getConsensusInfo()
     return mConsensus.getJson(true);
 }
 
+// RHTODO: not threadsafe?
+RCLConsensus&
+NetworkOPsImp::getConsensus()
+{
+    return mConsensus;
+}
+
+LedgerMaster&
+NetworkOPsImp::getLedgerMaster()
+{
+    return m_ledgerMaster;
+}
+
 Json::Value
 NetworkOPsImp::getServerInfo(bool human, bool admin, bool counters)
 {
@@ -4193,6 +4128,12 @@ NetworkOPsImp::stateAccounting(Json::Value& obj)
     accounting_.json(obj);
 }
 
+StateAccounting::CounterData
+NetworkOPsImp::getStateAccountingData()
+{
+    return accounting_.getCounterData();
+}
+
 // <-- bool: true=erased, false=was not there
 bool
 NetworkOPsImp::unsubValidations(std::uint64_t uSeq)
@@ -4663,50 +4604,6 @@ NetworkOPsImp::collect_metrics()
         counters[static_cast<std::size_t>(OperatingMode::FULL)].transitions);
 }
 
-void
-NetworkOPsImp::StateAccounting::mode(OperatingMode om)
-{
-    auto now = std::chrono::steady_clock::now();
-
-    std::lock_guard lock(mutex_);
-    ++counters_[static_cast<std::size_t>(om)].transitions;
-    if (om == OperatingMode::FULL &&
-        counters_[static_cast<std::size_t>(om)].transitions == 1)
-    {
-        initialSyncUs_ = std::chrono::duration_cast<std::chrono::microseconds>(
-                             now - processStart_)
-                             .count();
-    }
-    counters_[static_cast<std::size_t>(mode_)].dur +=
-        std::chrono::duration_cast<std::chrono::microseconds>(now - start_);
-
-    mode_ = om;
-    start_ = now;
-}
-
-void
-NetworkOPsImp::StateAccounting::json(Json::Value& obj) const
-{
-    auto [counters, mode, start, initialSync] = getCounterData();
-    auto const current = std::chrono::duration_cast<std::chrono::microseconds>(
-        std::chrono::steady_clock::now() - start);
-    counters[static_cast<std::size_t>(mode)].dur += current;
-
-    obj[jss::state_accounting] = Json::objectValue;
-    for (std::size_t i = static_cast<std::size_t>(OperatingMode::DISCONNECTED);
-         i <= static_cast<std::size_t>(OperatingMode::FULL);
-         ++i)
-    {
-        obj[jss::state_accounting][states_[i]] = Json::objectValue;
-        auto& state = obj[jss::state_accounting][states_[i]];
-        state[jss::transitions] = std::to_string(counters[i].transitions);
-        state[jss::duration_us] = std::to_string(counters[i].dur.count());
-    }
-    obj[jss::server_state_duration_us] = std::to_string(current.count());
-    if (initialSync)
-        obj[jss::initial_sync_duration_us] = std::to_string(initialSync);
-}
-
 //------------------------------------------------------------------------------
 
 std::unique_ptr<NetworkOPs>

src/ripple/app/misc/NetworkOPs.h

@@ -20,8 +20,10 @@
 #ifndef RIPPLE_APP_MISC_NETWORKOPS_H_INCLUDED
 #define RIPPLE_APP_MISC_NETWORKOPS_H_INCLUDED
 
+#include <ripple/app/consensus/RCLConsensus.h>
 #include <ripple/app/consensus/RCLCxPeerPos.h>
 #include <ripple/app/ledger/Ledger.h>
+#include <ripple/app/misc/StateAccounting.h>
 #include <ripple/core/JobQueue.h>
 #include <ripple/ledger/ReadView.h>
 #include <ripple/net/InfoSub.h>
@@ -42,35 +44,6 @@ class LedgerMaster;
 class Transaction;
 class ValidatorKeys;
 
-// This is the primary interface into the "client" portion of the program.
-// Code that wants to do normal operations on the network such as
-// creating and monitoring accounts, creating transactions, and so on
-// should use this interface. The RPC code will primarily be a light wrapper
-// over this code.
-//
-// Eventually, it will check the node's operating mode (synched, unsynched,
-// etectera) and defer to the correct means of processing. The current
-// code assumes this node is synched (and will continue to do so until
-// there's a functional network.
-//
-
-/** Specifies the mode under which the server believes it's operating.
-
-    This has implications about how the server processes transactions and
-    how it responds to requests (e.g. account balance request).
-
-    @note Other code relies on the numerical values of these constants; do
-          not change them without verifying each use and ensuring that it is
-          not a breaking change.
-*/
-enum class OperatingMode {
-    DISCONNECTED = 0,  //!< not ready to process requests
-    CONNECTED = 1,     //!< convinced we are talking to the network
-    SYNCING = 2,       //!< fallen slightly behind
-    TRACKING = 3,      //!< convinced we agree with the network
-    FULL = 4           //!< we have the ledger and can even validate
-};
-
 /** Provides server functionality for clients.
 
     Clients include backend applications, local commands, and connected
@@ -221,6 +194,13 @@ public:
 
     virtual Json::Value
     getConsensusInfo() = 0;
+
+    virtual RCLConsensus&
+    getConsensus() = 0;
+
+    virtual LedgerMaster&
+    getLedgerMaster() = 0;
+
     virtual Json::Value
     getServerInfo(bool human, bool admin, bool counters) = 0;
     virtual void
@@ -228,6 +208,9 @@ public:
     virtual Json::Value
     getLedgerFetchInfo() = 0;
 
+    virtual StateAccounting::CounterData
+    getStateAccountingData() = 0;
+
     /** Accepts the current transaction tree, return the new ledger's sequence
 
         This API is only used via RPC with the server in STANDALONE mode and

src/ripple/app/misc/StateAccounting.cpp

@@ -0,0 +1,49 @@
+#include <ripple/app/misc/StateAccounting.h>
+
+namespace ripple {
+
+void
+StateAccounting::mode(OperatingMode om)
+{
+    std::lock_guard lock(mutex_);
+    auto now = std::chrono::steady_clock::now();
+
+    ++counters_[static_cast<std::size_t>(om)].transitions;
+    if (om == OperatingMode::FULL &&
+        counters_[static_cast<std::size_t>(om)].transitions == 1)
+    {
+        initialSyncUs_ = std::chrono::duration_cast<std::chrono::microseconds>(
+                             now - processStart_)
+                             .count();
+    }
+    counters_[static_cast<std::size_t>(mode_)].dur +=
+        std::chrono::duration_cast<std::chrono::microseconds>(now - start_);
+
+    mode_ = om;
+    start_ = now;
+}
+
+void
+StateAccounting::json(Json::Value& obj)
+{
+    auto [counters, mode, start, initialSync] = getCounterData();
+    auto const current = std::chrono::duration_cast<std::chrono::microseconds>(
+        std::chrono::steady_clock::now() - start);
+    counters[static_cast<std::size_t>(mode)].dur += current;
+
+    obj[jss::state_accounting] = Json::objectValue;
+    for (std::size_t i = static_cast<std::size_t>(OperatingMode::DISCONNECTED);
+         i <= static_cast<std::size_t>(OperatingMode::FULL);
+         ++i)
+    {
+        obj[jss::state_accounting][states_[i]] = Json::objectValue;
+        auto& state = obj[jss::state_accounting][states_[i]];
+        state[jss::transitions] = std::to_string(counters[i].transitions);
+        state[jss::duration_us] = std::to_string(counters[i].dur.count());
+    }
+    obj[jss::server_state_duration_us] = std::to_string(current.count());
+    if (initialSync)
+        obj[jss::initial_sync_duration_us] = std::to_string(initialSync);
+}
+
+}  // namespace ripple

src/ripple/app/misc/StateAccounting.h

@@ -0,0 +1,99 @@
+#ifndef RIPPLE_APP_MAIN_STATEACCOUNTING_H_INCLUDED
+#define RIPPLE_APP_MAIN_STATEACCOUNTING_H_INCLUDED
+
+#include <ripple/basics/chrono.h>
+#include <ripple/beast/utility/Journal.h>
+#include <ripple/json/json_value.h>
+#include <ripple/protocol/jss.h>
+#include <array>
+#include <mutex>
+
+namespace ripple {
+
+// This is the primary interface into the "client" portion of the program.
+// Code that wants to do normal operations on the network such as
+// creating and monitoring accounts, creating transactions, and so on
+// should use this interface. The RPC code will primarily be a light wrapper
+// over this code.
+//
+// Eventually, it will check the node's operating mode (synched, unsynched,
+// etectera) and defer to the correct means of processing. The current
+// code assumes this node is synched (and will continue to do so until
+// there's a functional network.
+//
+
+/** Specifies the mode under which the server believes it's operating.
+
+    This has implications about how the server processes transactions and
+    how it responds to requests (e.g. account balance request).
+
+    @note Other code relies on the numerical values of these constants; do
+          not change them without verifying each use and ensuring that it is
+          not a breaking change.
+*/
+enum class OperatingMode {
+    DISCONNECTED = 0,  //!< not ready to process requests
+    CONNECTED = 1,     //!< convinced we are talking to the network
+    SYNCING = 2,       //!< fallen slightly behind
+    TRACKING = 3,      //!< convinced we agree with the network
+    FULL = 4           //!< we have the ledger and can even validate
+};
+
+class StateAccounting
+{
+public:
+    constexpr static std::array<Json::StaticString const, 5> const states_ = {
+        {Json::StaticString("disconnected"),
+         Json::StaticString("connected"),
+         Json::StaticString("syncing"),
+         Json::StaticString("tracking"),
+         Json::StaticString("full")}};
+
+    struct Counters
+    {
+        explicit Counters() = default;
+
+        std::uint64_t transitions = 0;
+        std::chrono::microseconds dur = std::chrono::microseconds(0);
+    };
+
+private:
+    OperatingMode mode_ = OperatingMode::DISCONNECTED;
+    std::array<Counters, 5> counters_;
+    mutable std::mutex mutex_;
+    std::chrono::steady_clock::time_point start_ =
+        std::chrono::steady_clock::now();
+    std::chrono::steady_clock::time_point const processStart_ = start_;
+    std::uint64_t initialSyncUs_{0};
+
+public:
+    explicit StateAccounting()
+    {
+        counters_[static_cast<std::size_t>(OperatingMode::DISCONNECTED)]
+            .transitions = 1;
+    }
+
+    //! Record state transition. Update duration spent in previous state.
+    void
+    mode(OperatingMode om);
+
+    //! Output state counters in JSON format.
+    void
+    json(Json::Value& obj);
+
+    using CounterData = std::tuple<
+        decltype(counters_),
+        decltype(mode_),
+        decltype(start_),
+        decltype(initialSyncUs_)>;
+
+    CounterData
+    getCounterData()
+    {
+        return {counters_, mode_, start_, initialSyncUs_};
+    }
+};
+
+}  // namespace ripple
+
+#endif

src/ripple/app/tx/impl/Import.cpp

@@ -889,6 +889,45 @@ Import::preclaim(PreclaimContext const& ctx)
     }
 
     auto const& sle = ctx.view.read(keylet::account(ctx.tx[sfAccount]));
+
+    auto const tt = stpTrans->getTxnType();
+    if ((tt == ttSIGNER_LIST_SET || tt == ttREGULAR_KEY_SET) &&
+        ctx.view.rules().enabled(fixReduceImport) && sle)
+    {
+        // blackhole check
+        do
+        {
+            // if master key is not set then it is not blackholed
+            if (!(sle->getFlags() & lsfDisableMaster))
+                break;
+
+            // if a regular key is set then it must be acc 0, 1, or 2 otherwise
+            // not blackholed
+            if (sle->isFieldPresent(sfRegularKey))
+            {
+                AccountID rk = sle->getAccountID(sfRegularKey);
+                static const AccountID ACCOUNT_ZERO(0);
+                static const AccountID ACCOUNT_ONE(1);
+                static const AccountID ACCOUNT_TWO(2);
+
+                if (rk != ACCOUNT_ZERO && rk != ACCOUNT_ONE &&
+                    rk != ACCOUNT_TWO)
+                    break;
+            }
+
+            // if a signer list is set then it's not blackholed
+            auto const signerListKeylet = keylet::signers(ctx.tx[sfAccount]);
+            if (ctx.view.exists(signerListKeylet))
+                break;
+
+            // execution to here means it's blackholed
+            JLOG(ctx.j.warn())
+                << "Import: during preclaim target account is blackholed "
+                << ctx.tx[sfAccount] << ", bailing.";
+            return tefIMPORT_BLACKHOLED;
+        } while (0);
+    }
+
     if (sle && sle->isFieldPresent(sfImportSequence))
     {
         uint32_t sleImportSequence = sle->getFieldU32(sfImportSequence);

src/ripple/core/Config.h

@@ -155,6 +155,8 @@ public:
     std::map<std::string, PublicKey>
         IMPORT_VL_KEYS;  // hex string -> class PublicKey (for caching purposes)
 
+    std::string DATAGRAM_MONITOR;
+
     enum StartUpType {
         FRESH,
         NORMAL,

src/ripple/core/ConfigSections.h

@@ -101,6 +101,7 @@ struct ConfigSection
 #define SECTION_SWEEP_INTERVAL "sweep_interval"
 #define SECTION_NETWORK_ID "network_id"
 #define SECTION_IMPORT_VL_KEYS "import_vl_keys"
+#define SECTION_DATAGRAM_MONITOR "datagram_monitor"
 
 }  // namespace ripple
 

src/ripple/core/impl/Config.cpp

@@ -281,6 +281,9 @@ Config::setupControl(bool bQuiet, bool bSilent, bool bStandalone)
     // RAM and CPU resources. We default to "tiny" for standalone mode.
     if (!bStandalone)
     {
+        NODE_SIZE = 4;
+        return;
+
         // First, check against 'minimum' RAM requirements per node size:
         auto const& threshold =
             sizedItems[std::underlying_type_t<SizedItem>(SizedItem::ramSizeGB)];
@@ -465,26 +468,24 @@ Config::loadFromString(std::string const& fileContents)
         SNTP_SERVERS = *s;
 
     // if the user has specified ip:port then replace : with a space.
-    {
-        auto replaceColons = [](std::vector<std::string>& strVec) {
-            const static std::regex e(":([0-9]+)$");
-            for (auto& line : strVec)
-            {
-                // skip anything that might be an ipv6 address
-                if (std::count(line.begin(), line.end(), ':') != 1)
-                    continue;
+    auto replaceColons = [](std::vector<std::string>& strVec) {
+        const static std::regex e(":([0-9]+)$");
+        for (auto& line : strVec)
+        {
+            // skip anything that might be an ipv6 address
+            if (std::count(line.begin(), line.end(), ':') != 1)
+                continue;
 
-                std::string result = std::regex_replace(line, e, " $1");
-                // sanity check the result of the replace, should be same length
-                // as input
-                if (result.size() == line.size())
-                    line = result;
-            }
-        };
+            std::string result = std::regex_replace(line, e, " $1");
+            // sanity check the result of the replace, should be same length
+            // as input
+            if (result.size() == line.size())
+                line = result;
+        }
+    };
 
-        replaceColons(IPS_FIXED);
-        replaceColons(IPS);
-    }
+    replaceColons(IPS_FIXED);
+    replaceColons(IPS);
 
     {
         std::string dbPath;
@@ -509,6 +510,13 @@ Config::loadFromString(std::string const& fileContents)
             NETWORK_ID = beast::lexicalCastThrow<uint32_t>(strTemp);
     }
 
+    if (getSingleSection(secConfig, SECTION_DATAGRAM_MONITOR, strTemp, j_))
+    {
+        std::vector<std::string> vecTemp{strTemp};
+        replaceColons(vecTemp);
+        DATAGRAM_MONITOR = vecTemp[0];
+    }
+
     if (getSingleSection(secConfig, SECTION_PEER_PRIVATE, strTemp, j_))
         PEER_PRIVATE = beast::lexicalCastThrow<bool>(strTemp);
 

src/ripple/nodestore/impl/Shard.cpp

@@ -710,10 +710,7 @@ Shard::finalize(bool writeSQLite, std::optional<uint256> const& referenceHash)
         if (writeSQLite && !storeSQLite(ledger))
             return fail("failed storing to SQLite databases");
 
-        assert(
-            ledger->info().seq == ledgerSeq &&
-            (ledger->info().seq < XRP_LEDGER_EARLIEST_FEES ||
-             ledger->read(keylet::fees())));
+        assert(ledger->info().seq == ledgerSeq && ledger->read(keylet::fees()));
 
         hash = ledger->info().parentHash;
         next = std::move(ledger);

src/ripple/protocol/Feature.h

@@ -74,7 +74,7 @@ namespace detail {
 // Feature.cpp. Because it's only used to reserve storage, and determine how
 // large to make the FeatureBitset, it MAY be larger. It MUST NOT be less than
 // the actual number of amendments. A LogicError on startup will verify this.
-static constexpr std::size_t numFeatures = 74;
+static constexpr std::size_t numFeatures = 75;
 
 /** Amendments that this server supports and the default voting behavior.
    Whether they are enabled depends on the Rules defined in the validated
@@ -362,6 +362,7 @@ extern uint256 const fix240819;
 extern uint256 const fixPageCap;
 extern uint256 const fix240911;
 extern uint256 const fixFloatDivide;
+extern uint256 const fixReduceImport;
 
 }  // namespace ripple
 

src/ripple/protocol/TER.h

@@ -184,6 +184,7 @@ enum TEFcodes : TERUnderlyingType {
     tefPAST_IMPORT_SEQ,
     tefPAST_IMPORT_VL_SEQ,
     tefNONDIR_EMIT,
+    tefIMPORT_BLACKHOLED,
 };
 
 //------------------------------------------------------------------------------

src/ripple/protocol/impl/Feature.cpp

@@ -468,6 +468,7 @@ REGISTER_FIX    (fix240819,                     Supported::yes, VoteBehavior::De
 REGISTER_FIX    (fixPageCap,                    Supported::yes, VoteBehavior::DefaultYes);
 REGISTER_FIX    (fix240911,                     Supported::yes, VoteBehavior::DefaultYes);
 REGISTER_FIX    (fixFloatDivide,                Supported::yes, VoteBehavior::DefaultYes);
+REGISTER_FIX    (fixReduceImport,               Supported::yes, VoteBehavior::DefaultYes);
 
 // The following amendments are obsolete, but must remain supported
 // because they could potentially get enabled.

src/ripple/protocol/impl/TER.cpp

@@ -116,6 +116,7 @@ transResults()
         MAKE_ERROR(tefNO_TICKET,                   "Ticket is not in ledger."),
         MAKE_ERROR(tefNFTOKEN_IS_NOT_TRANSFERABLE, "The specified NFToken is not transferable."),
         MAKE_ERROR(tefNONDIR_EMIT,                 "An emitted txn was injected into the ledger without a corresponding directory entry."),
+        MAKE_ERROR(tefIMPORT_BLACKHOLED,           "Cannot import keying because target account is blackholed."),
 
         MAKE_ERROR(telLOCAL_ERROR,            "Local failure."),
         MAKE_ERROR(telBAD_DOMAIN,             "Domain too long."),

src/ripple/rpc/handlers/Subscribe.cpp

@@ -30,6 +30,7 @@
 #include <ripple/rpc/Context.h>
 #include <ripple/rpc/Role.h>
 #include <ripple/rpc/impl/RPCHelpers.h>
+#include <ripple/rpc/impl/UDPInfoSub.h>
 
 namespace ripple {
 
@@ -42,7 +43,7 @@ doSubscribe(RPC::JsonContext& context)
     if (!context.infoSub && !context.params.isMember(jss::url))
     {
         // Must be a JSON-RPC call.
-        JLOG(context.j.info()) << "doSubscribe: RPC subscribe requires a url";
+        JLOG(context.j.warn()) << "doSubscribe: RPC subscribe requires a url";
         return rpcError(rpcINVALID_PARAMS);
     }
 
@@ -373,6 +374,13 @@ doSubscribe(RPC::JsonContext& context)
         }
     }
 
+    if (ispSub)
+    {
+        if (std::shared_ptr<UDPInfoSub> udp =
+                std::dynamic_pointer_cast<UDPInfoSub>(ispSub))
+            udp->increment();
+    }
+
     return jvResult;
 }
 

src/ripple/rpc/handlers/Unsubscribe.cpp

@@ -25,6 +25,7 @@
 #include <ripple/rpc/Context.h>
 #include <ripple/rpc/Role.h>
 #include <ripple/rpc/impl/RPCHelpers.h>
+#include <ripple/rpc/impl/UDPInfoSub.h>
 
 namespace ripple {
 
@@ -245,6 +246,12 @@ doUnsubscribe(RPC::JsonContext& context)
         context.netOps.tryRemoveRpcSub(context.params[jss::url].asString());
     }
 
+    if (ispSub)
+    {
+        if (auto udp = std::dynamic_pointer_cast<UDPInfoSub>(ispSub))
+            udp->destroy();
+    }
+
     return jvResult;
 }
 

src/ripple/rpc/impl/ServerHandlerImp.cpp

@@ -361,6 +361,67 @@ ServerHandlerImp::onWSMessage(
     }
 }
 
+void
+ServerHandlerImp::onUDPMessage(
+    std::string const& message,
+    boost::asio::ip::tcp::endpoint const& remoteEndpoint,
+    std::function<void(std::string const&)> sendResponse)
+{
+    Json::Value jv;
+    if (message.size() > RPC::Tuning::maxRequestSize ||
+        !Json::Reader{}.parse(message, jv) || !jv.isObject())
+    {
+        Json::Value jvResult(Json::objectValue);
+        jvResult[jss::type] = jss::error;
+        jvResult[jss::error] = "jsonInvalid";
+        jvResult[jss::value] = message;
+
+        std::string const response = to_string(jvResult);
+        JLOG(m_journal.trace())
+            << "UDP sending error response: '" << jvResult << "'";
+        sendResponse(response);
+        return;
+    }
+
+    JLOG(m_journal.trace())
+        << "UDP received '" << jv << "' from " << remoteEndpoint;
+
+    auto const postResult = m_jobQueue.postCoro(
+        jtCLIENT_RPC,  // Using RPC job type since this is admin RPC
+        "UDP-RPC",
+        [this,
+         remoteEndpoint,
+         jv = std::move(jv),
+         sendResponse = std::move(sendResponse)](
+            std::shared_ptr<JobQueue::Coro> const& coro) {
+            // Process the request similar to WebSocket but with UDP context
+            Role const role = Role::ADMIN;  // UDP-RPC is admin-only
+            auto const jr =
+                this->processUDP(jv, role, coro, sendResponse, remoteEndpoint);
+
+            std::string const response = to_string(jr);
+            JLOG(m_journal.trace())
+                << "UDP sending '" << jr << "' to " << remoteEndpoint;
+
+            // Send response back via UDP
+            sendResponse(response);
+        });
+
+    if (postResult == nullptr)
+    {
+        // Request rejected, probably shutting down
+        Json::Value jvResult(Json::objectValue);
+        jvResult[jss::type] = jss::error;
+        jvResult[jss::error] = "serverShuttingDown";
+        jvResult[jss::value] = "Server is shutting down";
+
+        std::string const response = to_string(jvResult);
+        JLOG(m_journal.trace())
+            << "UDP sending shutdown response to " << remoteEndpoint;
+        sendResponse(response);
+    }
+}
+
 void
 ServerHandlerImp::onClose(Session& session, boost::system::error_code const&)
 {
@@ -397,6 +458,145 @@ logDuration(
                 << " microseconds. request = " << request;
 }
 
+Json::Value
+ServerHandlerImp::processUDP(
+    Json::Value const& jv,
+    Role const& role,
+    std::shared_ptr<JobQueue::Coro> const& coro,
+    std::optional<std::function<void(std::string const&)>>
+        sendResponse /* used for subscriptions */,
+    boost::asio::ip::tcp::endpoint const& remoteEndpoint)
+{
+    std::shared_ptr<InfoSub> is;
+    // Requests without "command" are invalid.
+    Json::Value jr(Json::objectValue);
+    try
+    {
+        auto apiVersion =
+            RPC::getAPIVersionNumber(jv, app_.config().BETA_RPC_API);
+        if (apiVersion == RPC::apiInvalidVersion ||
+            (!jv.isMember(jss::command) && !jv.isMember(jss::method)) ||
+            (jv.isMember(jss::command) && !jv[jss::command].isString()) ||
+            (jv.isMember(jss::method) && !jv[jss::method].isString()) ||
+            (jv.isMember(jss::command) && jv.isMember(jss::method) &&
+             jv[jss::command].asString() != jv[jss::method].asString()))
+        {
+            jr[jss::type] = jss::response;
+            jr[jss::status] = jss::error;
+            jr[jss::error] = apiVersion == RPC::apiInvalidVersion
+                ? jss::invalid_API_version
+                : jss::missingCommand;
+            jr[jss::request] = jv;
+            if (jv.isMember(jss::id))
+                jr[jss::id] = jv[jss::id];
+            if (jv.isMember(jss::jsonrpc))
+                jr[jss::jsonrpc] = jv[jss::jsonrpc];
+            if (jv.isMember(jss::ripplerpc))
+                jr[jss::ripplerpc] = jv[jss::ripplerpc];
+            if (jv.isMember(jss::api_version))
+                jr[jss::api_version] = jv[jss::api_version];
+
+            return jr;
+        }
+
+        auto required = RPC::roleRequired(
+            apiVersion,
+            app_.config().BETA_RPC_API,
+            jv.isMember(jss::command) ? jv[jss::command].asString()
+                                      : jv[jss::method].asString());
+        if (Role::FORBID == role)
+        {
+            jr[jss::result] = rpcError(rpcFORBIDDEN);
+        }
+        else
+        {
+            Resource::Consumer c;
+            Resource::Charge loadType = Resource::feeReferenceRPC;
+
+            if (sendResponse.has_value())
+                is = UDPInfoSub::getInfoSub(
+                    m_networkOPs, *sendResponse, remoteEndpoint);
+
+            RPC::JsonContext context{
+                {app_.journal("RPCHandler"),
+                 app_,
+                 loadType,
+                 app_.getOPs(),
+                 app_.getLedgerMaster(),
+                 c,
+                 role,
+                 coro,
+                 is,
+                 apiVersion},
+                jv};
+
+            auto start = std::chrono::system_clock::now();
+            RPC::doCommand(context, jr[jss::result]);
+            auto end = std::chrono::system_clock::now();
+            logDuration(jv, end - start, m_journal);
+        }
+    }
+    catch (std::exception const& ex)
+    {
+        jr[jss::result] = RPC::make_error(rpcINTERNAL);
+        JLOG(m_journal.error())
+            << "Exception while processing WS: " << ex.what() << "\n"
+            << "Input JSON: " << Json::Compact{Json::Value{jv}};
+    }
+
+    if (is)
+    {
+        if (auto udp = std::dynamic_pointer_cast<UDPInfoSub>(is))
+            udp->destroy();
+    }
+
+    // Currently we will simply unwrap errors returned by the RPC
+    // API, in the future maybe we can make the responses
+    // consistent.
+    //
+    // Regularize result. This is duplicate code.
+    if (jr[jss::result].isMember(jss::error))
+    {
+        jr = jr[jss::result];
+        jr[jss::status] = jss::error;
+
+        auto rq = jv;
+
+        if (rq.isObject())
+        {
+            if (rq.isMember(jss::passphrase.c_str()))
+                rq[jss::passphrase.c_str()] = "<masked>";
+            if (rq.isMember(jss::secret.c_str()))
+                rq[jss::secret.c_str()] = "<masked>";
+            if (rq.isMember(jss::seed.c_str()))
+                rq[jss::seed.c_str()] = "<masked>";
+            if (rq.isMember(jss::seed_hex.c_str()))
+                rq[jss::seed_hex.c_str()] = "<masked>";
+        }
+
+        jr[jss::request] = rq;
+    }
+    else
+    {
+        if (jr[jss::result].isMember("forwarded") &&
+            jr[jss::result]["forwarded"])
+            jr = jr[jss::result];
+        jr[jss::status] = jss::success;
+    }
+
+    if (jv.isMember(jss::id))
+        jr[jss::id] = jv[jss::id];
+    if (jv.isMember(jss::jsonrpc))
+        jr[jss::jsonrpc] = jv[jss::jsonrpc];
+    if (jv.isMember(jss::ripplerpc))
+        jr[jss::ripplerpc] = jv[jss::ripplerpc];
+    if (jv.isMember(jss::api_version))
+        jr[jss::api_version] = jv[jss::api_version];
+
+    jr[jss::type] = jss::response;
+    return jr;
+}
+
 Json::Value
 ServerHandlerImp::processSession(
     std::shared_ptr<WSSession> const& session,

src/ripple/rpc/impl/ServerHandlerImp.h

@@ -24,6 +24,7 @@
 #include <ripple/core/JobQueue.h>
 #include <ripple/json/Output.h>
 #include <ripple/rpc/RPCHandler.h>
+#include <ripple/rpc/impl/UDPInfoSub.h>
 #include <ripple/rpc/impl/WSInfoSub.h>
 #include <ripple/server/Server.h>
 #include <ripple/server/Session.h>
@@ -164,6 +165,12 @@ public:
         std::shared_ptr<WSSession> session,
         std::vector<boost::asio::const_buffer> const& buffers);
 
+    void
+    onUDPMessage(
+        std::string const& message,
+        boost::asio::ip::tcp::endpoint const& remoteEndpoint,
+        std::function<void(std::string const&)> sendResponse);
+
     void
     onClose(Session& session, boost::system::error_code const&);
 
@@ -177,6 +184,14 @@ private:
         std::shared_ptr<JobQueue::Coro> const& coro,
         Json::Value const& jv);
 
+    Json::Value
+    processUDP(
+        Json::Value const& jv,
+        Role const& role,
+        std::shared_ptr<JobQueue::Coro> const& coro,
+        std::optional<std::function<void(std::string const&)>> sendResponse,
+        boost::asio::ip::tcp::endpoint const& remoteEndpoint);
+
     void
     processSession(
         std::shared_ptr<Session> const&,

src/ripple/rpc/impl/UDPInfoSub.h

@@ -0,0 +1,140 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_RPC_UDPINFOSUB_H
+#define RIPPLE_RPC_UDPINFOSUB_H
+
+#include <ripple/beast/net/IPAddressConversion.h>
+#include <ripple/json/json_writer.h>
+#include <ripple/json/to_string.h>
+#include <ripple/net/InfoSub.h>
+#include <ripple/rpc/Role.h>
+#include <ripple/server/WSSession.h>
+#include <boost/utility/string_view.hpp>
+#include <memory>
+#include <string>
+
+namespace ripple {
+class UDPInfoSub : public InfoSub
+{
+    std::function<void(std::string const&)> send_;
+    boost::asio::ip::tcp::endpoint endpoint_;
+
+    UDPInfoSub(
+        Source& source,
+        std::function<void(std::string const&)>& sendResponse,
+        boost::asio::ip::tcp::endpoint const& remoteEndpoint)
+        : InfoSub(source), send_(sendResponse), endpoint_(remoteEndpoint)
+    {
+    }
+
+    struct RefCountedSub
+    {
+        std::shared_ptr<UDPInfoSub> sub;
+        size_t refCount;
+
+        RefCountedSub(std::shared_ptr<UDPInfoSub> s)
+            : sub(std::move(s)), refCount(1)
+        {
+        }
+    };
+
+    static inline std::mutex mtx_;
+    static inline std::map<boost::asio::ip::tcp::endpoint, RefCountedSub> map_;
+
+public:
+    static std::shared_ptr<UDPInfoSub>
+    getInfoSub(
+        Source& source,
+        std::function<void(std::string const&)>& sendResponse,
+        boost::asio::ip::tcp::endpoint const& remoteEndpoint)
+    {
+        std::lock_guard<std::mutex> lock(mtx_);
+
+        auto it = map_.find(remoteEndpoint);
+        if (it != map_.end())
+        {
+            it->second.refCount++;
+            return it->second.sub;
+        }
+
+        auto sub = std::shared_ptr<UDPInfoSub>(
+            new UDPInfoSub(source, sendResponse, remoteEndpoint));
+        map_.emplace(remoteEndpoint, RefCountedSub(sub));
+        return sub;
+    }
+
+    static bool
+    increment(boost::asio::ip::tcp::endpoint const& remoteEndpoint)
+    {
+        std::lock_guard<std::mutex> lock(mtx_);
+
+        auto it = map_.find(remoteEndpoint);
+        if (it != map_.end())
+        {
+            it->second.refCount++;
+            return true;
+        }
+        return false;
+    }
+
+    bool
+    increment()
+    {
+        return increment(endpoint_);
+    }
+
+    static bool
+    destroy(boost::asio::ip::tcp::endpoint const& remoteEndpoint)
+    {
+        std::lock_guard<std::mutex> lock(mtx_);
+
+        auto it = map_.find(remoteEndpoint);
+        if (it != map_.end())
+        {
+            if (--it->second.refCount == 0)
+            {
+                map_.erase(it);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    bool
+    destroy()
+    {
+        return destroy(endpoint_);
+    }
+
+    void
+    send(Json::Value const& jv, bool) override
+    {
+        std::string const str = to_string(jv);
+        send_(str);
+    }
+
+    boost::asio::ip::tcp::endpoint const&
+    endpoint() const
+    {
+        return endpoint_;
+    }
+};
+}  // namespace ripple
+#endif

src/ripple/server/Port.h

@@ -86,6 +86,15 @@ struct Port
     // Returns a string containing the list of protocols
     std::string
     protocols() const;
+
+    bool
+    has_udp() const
+    {
+        return protocol.count("udp") > 0;
+    }
+
+    // Maximum UDP packet size (default 64KB)
+    std::size_t udp_packet_size = 65536;
 };
 
 std::ostream&

src/ripple/server/impl/Port.cpp

@@ -244,6 +244,13 @@ parse_Port(ParsedPort& port, Section const& section, std::ostream& log)
                      optResult->begin(), optResult->end()))
                 port.protocol.insert(s);
         }
+
+        if (port.protocol.count("udp") > 0 && port.protocol.size() > 1)
+        {
+            log << "Port " << section.name()
+                << " cannot mix UDP with other protocols";
+            Throw<std::exception>();
+        }
     }
 
     {

src/ripple/server/impl/ServerImpl.h

@@ -24,6 +24,7 @@
 #include <ripple/beast/core/List.h>
 #include <ripple/server/Server.h>
 #include <ripple/server/impl/Door.h>
+#include <ripple/server/impl/UDPDoor.h>
 #include <ripple/server/impl/io_list.h>
 #include <boost/asio.hpp>
 #include <array>
@@ -162,18 +163,35 @@ ServerImpl<Handler>::ports(std::vector<Port> const& ports)
 {
     if (closed())
         Throw<std::logic_error>("ports() on closed Server");
+
     ports_.reserve(ports.size());
     Endpoints eps;
     eps.reserve(ports.size());
+
     for (auto const& port : ports)
     {
         ports_.push_back(port);
-        if (auto sp = ios_.emplace<Door<Handler>>(
-                handler_, io_service_, ports_.back(), j_))
+
+        if (port.has_udp())
         {
-            list_.push_back(sp);
-            eps.push_back(sp->get_endpoint());
-            sp->run();
+            // UDP-RPC door
+            if (auto sp = ios_.emplace<UDPDoor<Handler>>(
+                    handler_, io_service_, ports_.back(), j_))
+            {
+                eps.push_back(sp->get_endpoint());
+                sp->run();
+            }
+        }
+        else
+        {
+            // Standard TCP door
+            if (auto sp = ios_.emplace<Door<Handler>>(
+                    handler_, io_service_, ports_.back(), j_))
+            {
+                list_.push_back(sp);
+                eps.push_back(sp->get_endpoint());
+                sp->run();
+            }
         }
     }
     return eps;

src/ripple/server/impl/UDPDoor.h

@@ -0,0 +1,284 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_SERVER_UDPDOOR_H_INCLUDED
+#define RIPPLE_SERVER_UDPDOOR_H_INCLUDED
+
+#include <ripple/basics/Log.h>
+#include <ripple/basics/contract.h>
+#include <ripple/server/impl/PlainHTTPPeer.h>
+#include <ripple/server/impl/SSLHTTPPeer.h>
+#include <ripple/server/impl/io_list.h>
+#include <boost/asio/basic_waitable_timer.hpp>
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/asio/spawn.hpp>
+#include <boost/beast/core/detect_ssl.hpp>
+#include <boost/beast/core/multi_buffer.hpp>
+#include <boost/beast/core/tcp_stream.hpp>
+#include <boost/container/flat_map.hpp>
+#include <chrono>
+#include <condition_variable>
+#include <functional>
+#include <memory>
+#include <mutex>
+
+namespace ripple {
+
+template <class Handler>
+class UDPDoor : public io_list::work,
+                public std::enable_shared_from_this<UDPDoor<Handler>>
+{
+private:
+    using error_code = boost::system::error_code;
+    using endpoint_type = boost::asio::ip::tcp::endpoint;
+    using udp_socket = boost::asio::ip::udp::socket;
+
+    beast::Journal const j_;
+    Port const& port_;
+    Handler& handler_;
+    boost::asio::io_context& ioc_;
+    boost::asio::strand<boost::asio::io_context::executor_type> strand_;
+    udp_socket socket_;
+    std::vector<char> recv_buffer_;
+    endpoint_type local_endpoint_;  // Store TCP-style endpoint
+
+public:
+    UDPDoor(
+        Handler& handler,
+        boost::asio::io_context& io_context,
+        Port const& port,
+        beast::Journal j)
+        : j_(j)
+        , port_(port)
+        , handler_(handler)
+        , ioc_(io_context)
+        , strand_(io_context.get_executor())
+        , socket_(io_context)
+        , recv_buffer_(port.udp_packet_size)
+        , local_endpoint_(port.ip, port.port)  // Store as TCP endpoint
+    {
+        error_code ec;
+
+        // Create UDP endpoint from port configuration
+        auto const addr = port_.ip.to_v4();
+        boost::asio::ip::udp::endpoint udp_endpoint(addr, port_.port);
+
+        socket_.open(boost::asio::ip::udp::v4(), ec);
+        if (ec)
+        {
+            JLOG(j_.error()) << "UDP socket open failed: " << ec.message();
+            return;
+        }
+
+        // Set socket options
+        socket_.set_option(boost::asio::socket_base::reuse_address(true), ec);
+        if (ec)
+        {
+            JLOG(j_.error())
+                << "UDP set reuse_address failed: " << ec.message();
+            return;
+        }
+
+        socket_.bind(udp_endpoint, ec);
+        if (ec)
+        {
+            JLOG(j_.error()) << "UDP socket bind failed: " << ec.message();
+            return;
+        }
+
+        JLOG(j_.info()) << "UDP-RPC listening on " << udp_endpoint;
+    }
+
+    endpoint_type
+    get_endpoint() const
+    {
+        return local_endpoint_;
+    }
+
+    void
+    run()
+    {
+        if (!socket_.is_open())
+            return;
+
+        do_receive();
+    }
+
+    void
+    close() override
+    {
+        error_code ec;
+        socket_.close(ec);
+    }
+
+private:
+    void
+    do_receive()
+    {
+        if (!socket_.is_open())
+            return;
+
+        socket_.async_receive_from(
+            boost::asio::buffer(recv_buffer_),
+            sender_endpoint_,
+            boost::asio::bind_executor(
+                strand_,
+                std::bind(
+                    &UDPDoor::on_receive,
+                    this->shared_from_this(),
+                    std::placeholders::_1,
+                    std::placeholders::_2)));
+    }
+
+    void
+    on_receive(error_code ec, std::size_t bytes_transferred)
+    {
+        if (ec)
+        {
+            if (ec != boost::asio::error::operation_aborted)
+            {
+                JLOG(j_.error()) << "UDP receive failed: " << ec.message();
+                do_receive();
+            }
+            return;
+        }
+
+        // Convert UDP endpoint to TCP endpoint for compatibility
+        endpoint_type tcp_endpoint(
+            sender_endpoint_.address(), sender_endpoint_.port());
+
+        // Handle the received UDP message
+        handler_.onUDPMessage(
+            std::string(recv_buffer_.data(), bytes_transferred),
+            tcp_endpoint,
+            [this, tcp_endpoint](std::string const& response) {
+                do_send(response, tcp_endpoint);
+            });
+
+        do_receive();
+    }
+
+    void
+    do_send(std::string const& response, endpoint_type const& tcp_endpoint)
+    {
+        if (!socket_.is_open())
+        {
+            std::cout << "UDP SOCKET NOT OPEN WHEN SENDING\n\n";
+            return;
+        }
+
+        const size_t HEADER_SIZE = 16;
+        const size_t MAX_DATAGRAM_SIZE =
+            65487;  // Allow for ipv6 header 40 bytes + 8 bytes of udp header
+        const size_t MAX_PAYLOAD_SIZE = MAX_DATAGRAM_SIZE - HEADER_SIZE;
+
+        // Convert TCP endpoint back to UDP for sending
+        boost::asio::ip::udp::endpoint udp_endpoint(
+            tcp_endpoint.address(), tcp_endpoint.port());
+
+        // If message fits in single datagram, send normally
+        if (response.length() <= MAX_DATAGRAM_SIZE)
+        {
+            socket_.async_send_to(
+                boost::asio::buffer(response),
+                udp_endpoint,
+                boost::asio::bind_executor(
+                    strand_,
+                    [this, self = this->shared_from_this()](
+                        error_code ec, std::size_t bytes_transferred) {
+                        if (ec && ec != boost::asio::error::operation_aborted)
+                        {
+                            JLOG(j_.error())
+                                << "UDP send failed: " << ec.message();
+                        }
+                    }));
+            return;
+        }
+
+        // Calculate number of packets needed
+        const size_t payload_size = MAX_PAYLOAD_SIZE;
+        const uint16_t total_packets =
+            (response.length() + payload_size - 1) / payload_size;
+
+        // Get current timestamp in microseconds
+        auto now = std::chrono::system_clock::now();
+        auto micros = std::chrono::duration_cast<std::chrono::microseconds>(
+                          now.time_since_epoch())
+                          .count();
+        uint64_t timestamp = static_cast<uint64_t>(micros);
+
+        // Send fragmented packets
+        for (uint16_t packet_num = 0; packet_num < total_packets; packet_num++)
+        {
+            std::string fragment;
+            fragment.reserve(MAX_DATAGRAM_SIZE);
+
+            // Add header - 4 bytes of zeros
+            fragment.push_back(0);
+            fragment.push_back(0);
+            fragment.push_back(0);
+            fragment.push_back(0);
+
+            // Add packet number (little endian)
+            fragment.push_back(packet_num & 0xFF);
+            fragment.push_back((packet_num >> 8) & 0xFF);
+
+            // Add total packets (little endian)
+            fragment.push_back(total_packets & 0xFF);
+            fragment.push_back((total_packets >> 8) & 0xFF);
+
+            // Add timestamp (8 bytes, little endian)
+            fragment.push_back(timestamp & 0xFF);
+            fragment.push_back((timestamp >> 8) & 0xFF);
+            fragment.push_back((timestamp >> 16) & 0xFF);
+            fragment.push_back((timestamp >> 24) & 0xFF);
+            fragment.push_back((timestamp >> 32) & 0xFF);
+            fragment.push_back((timestamp >> 40) & 0xFF);
+            fragment.push_back((timestamp >> 48) & 0xFF);
+            fragment.push_back((timestamp >> 56) & 0xFF);
+
+            // Calculate payload slice
+            size_t start = packet_num * payload_size;
+            size_t length = std::min(payload_size, response.length() - start);
+            fragment.append(response.substr(start, length));
+
+            socket_.async_send_to(
+                boost::asio::buffer(fragment),
+                udp_endpoint,
+                boost::asio::bind_executor(
+                    strand_,
+                    [this, self = this->shared_from_this()](
+                        error_code ec, std::size_t bytes_transferred) {
+                        if (ec && ec != boost::asio::error::operation_aborted)
+                        {
+                            JLOG(j_.error())
+                                << "UDP send failed: " << ec.message();
+                        }
+                    }));
+        }
+    }
+
+    boost::asio::ip::udp::endpoint sender_endpoint_;
+};
+
+}  // namespace ripple
+
+#endif

src/test/app/Import_test.cpp

@@ -79,7 +79,7 @@ class Import_test : public beast::unit_test::suite
     importVLSequence(jtx::Env const& env, PublicKey const& pk)
     {
         auto const sle = env.le(keylet::import_vlseq(pk));
-        if (sle->isFieldPresent(sfImportSequence))
+        if (sle && sle->isFieldPresent(sfImportSequence))
             return (*sle)[sfImportSequence];
         return 0;
     }
@@ -2672,6 +2672,134 @@ class Import_test : public beast::unit_test::suite
             env(import::import(alice, tmpXpop), ter(temMALFORMED));
         }
 
+        // tefIMPORT_BLACKHOLED - SetRegularKey (w/seed) AccountZero
+        {
+            test::jtx::Env env{
+                *this, network::makeNetworkVLConfig(21337, keys)};
+            auto const feeDrops = env.current()->fees().base;
+
+            auto const alice = Account("alice");
+            env.fund(XRP(1000), alice);
+            env.close();
+
+            // Set Regular Key
+            Json::Value jv;
+            jv[jss::Account] = alice.human();
+            const AccountID ACCOUNT_ZERO(0);
+            jv["RegularKey"] = to_string(ACCOUNT_ZERO);
+            jv[jss::TransactionType] = jss::SetRegularKey;
+            env(jv, alice);
+
+            // Disable Master Key
+            env(fset(alice, asfDisableMaster), sig(alice));
+            env.close();
+
+            // Import with Master Key
+            Json::Value tmpXpop =
+                import::loadXpop(ImportTCSetRegularKey::w_seed);
+            env(import::import(alice, tmpXpop),
+                ter(tefIMPORT_BLACKHOLED),
+                fee(feeDrops * 10),
+                sig(alice));
+            env.close();
+        }
+
+        // tefIMPORT_BLACKHOLED - SetRegularKey (w/seed) AccountOne
+        {
+            test::jtx::Env env{
+                *this, network::makeNetworkVLConfig(21337, keys)};
+            auto const feeDrops = env.current()->fees().base;
+
+            auto const alice = Account("alice");
+            env.fund(XRP(1000), alice);
+            env.close();
+
+            // Set Regular Key
+            Json::Value jv;
+            jv[jss::Account] = alice.human();
+            const AccountID ACCOUNT_ONE(1);
+            jv["RegularKey"] = to_string(ACCOUNT_ONE);
+            jv[jss::TransactionType] = jss::SetRegularKey;
+            env(jv, alice);
+
+            // Disable Master Key
+            env(fset(alice, asfDisableMaster), sig(alice));
+            env.close();
+
+            // Import with Master Key
+            Json::Value tmpXpop =
+                import::loadXpop(ImportTCSetRegularKey::w_seed);
+            env(import::import(alice, tmpXpop),
+                ter(tefIMPORT_BLACKHOLED),
+                fee(feeDrops * 10),
+                sig(alice));
+            env.close();
+        }
+
+        // tefIMPORT_BLACKHOLED - SetRegularKey (w/seed) AccountTwo
+        {
+            test::jtx::Env env{
+                *this, network::makeNetworkVLConfig(21337, keys)};
+            auto const feeDrops = env.current()->fees().base;
+
+            auto const alice = Account("alice");
+            env.fund(XRP(1000), alice);
+            env.close();
+
+            // Set Regular Key
+            Json::Value jv;
+            jv[jss::Account] = alice.human();
+            const AccountID ACCOUNT_TWO(2);
+            jv["RegularKey"] = to_string(ACCOUNT_TWO);
+            jv[jss::TransactionType] = jss::SetRegularKey;
+            env(jv, alice);
+
+            // Disable Master Key
+            env(fset(alice, asfDisableMaster), sig(alice));
+            env.close();
+
+            // Import with Master Key
+            Json::Value tmpXpop =
+                import::loadXpop(ImportTCSetRegularKey::w_seed);
+            env(import::import(alice, tmpXpop),
+                ter(tefIMPORT_BLACKHOLED),
+                fee(feeDrops * 10),
+                sig(alice));
+            env.close();
+        }
+
+        // tefIMPORT_BLACKHOLED - SignersListSet (w/seed)
+        {
+            test::jtx::Env env{
+                *this, network::makeNetworkVLConfig(21337, keys)};
+            auto const feeDrops = env.current()->fees().base;
+
+            auto const alice = Account("alice");
+            env.fund(XRP(1000), alice);
+            env.close();
+
+            // Set Regular Key
+            Json::Value jv;
+            jv[jss::Account] = alice.human();
+            const AccountID ACCOUNT_ZERO(0);
+            jv["RegularKey"] = to_string(ACCOUNT_ZERO);
+            jv[jss::TransactionType] = jss::SetRegularKey;
+            env(jv, alice);
+
+            // Disable Master Key
+            env(fset(alice, asfDisableMaster), sig(alice));
+            env.close();
+
+            // Import with Master Key
+            Json::Value tmpXpop =
+                import::loadXpop(ImportTCSignersListSet::w_seed);
+            env(import::import(alice, tmpXpop),
+                ter(tefIMPORT_BLACKHOLED),
+                fee(feeDrops * 10),
+                sig(alice));
+            env.close();
+        }
+
         // tefPAST_IMPORT_SEQ
         {
             test::jtx::Env env{
@@ -4580,14 +4708,22 @@ class Import_test : public beast::unit_test::suite
             // confirm signers set
             auto const [signers, signersSle] =
                 signersKeyAndSle(*env.current(), alice);
-            auto const signerEntries =
-                signersSle->getFieldArray(sfSignerEntries);
-            BEAST_EXPECT(signerEntries.size() == 2);
-            BEAST_EXPECT(signerEntries[0u].getFieldU16(sfSignerWeight) == 1);
             BEAST_EXPECT(
-                signerEntries[0u].getAccountID(sfAccount) == carol.id());
-            BEAST_EXPECT(signerEntries[1u].getFieldU16(sfSignerWeight) == 1);
-            BEAST_EXPECT(signerEntries[1u].getAccountID(sfAccount) == bob.id());
+                signersSle && signersSle->isFieldPresent(sfSignerEntries));
+            if (signersSle && signersSle->isFieldPresent(sfSignerEntries))
+            {
+                auto const signerEntries =
+                    signersSle->getFieldArray(sfSignerEntries);
+                BEAST_EXPECT(signerEntries.size() == 2);
+                BEAST_EXPECT(
+                    signerEntries[0u].getFieldU16(sfSignerWeight) == 1);
+                BEAST_EXPECT(
+                    signerEntries[0u].getAccountID(sfAccount) == carol.id());
+                BEAST_EXPECT(
+                    signerEntries[1u].getFieldU16(sfSignerWeight) == 1);
+                BEAST_EXPECT(
+                    signerEntries[1u].getAccountID(sfAccount) == bob.id());
+            }
 
             // confirm multisign tx
             env.close();
@@ -5986,6 +6122,69 @@ class Import_test : public beast::unit_test::suite
         }
     }
 
+    void
+    testBlackhole(FeatureBitset features)
+    {
+        testcase("blackhole");
+
+        using namespace test::jtx;
+        using namespace std::literals;
+
+        auto blackholeAccount = [&](Env& env, Account const& acct) {
+            // Set Regular Key
+            Json::Value jv;
+            jv[jss::Account] = acct.human();
+            const AccountID ACCOUNT_ZERO(0);
+            jv["RegularKey"] = to_string(ACCOUNT_ZERO);
+            jv[jss::TransactionType] = jss::SetRegularKey;
+            env(jv, acct);
+
+            // Disable Master Key
+            env(fset(acct, asfDisableMaster), sig(acct));
+            env.close();
+        };
+
+        auto burnHeader = [&](Env& env) {
+            // confirm total coins header
+            auto const initCoins = env.current()->info().drops;
+            BEAST_EXPECT(initCoins == 100'000'000'000'000'000);
+
+            // burn 10'000 xrp
+            auto const master = Account("masterpassphrase");
+            env(noop(master), fee(100'000'000'000'000), ter(tesSUCCESS));
+            env.close();
+
+            // confirm total coins header
+            auto const burnCoins = env.current()->info().drops;
+            BEAST_EXPECT(burnCoins == initCoins - 100'000'000'000'000);
+        };
+
+        // AccountSet (w/seed)
+        {
+            test::jtx::Env env{
+                *this, network::makeNetworkVLConfig(21337, keys)};
+            auto const feeDrops = env.current()->fees().base;
+
+            // Burn Header
+            burnHeader(env);
+
+            auto const alice = Account("alice");
+            env.fund(XRP(1000), alice);
+            env.close();
+
+            // Blackhole Account
+            blackholeAccount(env, alice);
+
+            // Import with Master Key
+            Json::Value tmpXpop = import::loadXpop(ImportTCAccountSet::w_seed);
+            env(import::import(alice, tmpXpop),
+                ter(tesSUCCESS),
+                fee(feeDrops * 10),
+                sig(alice));
+            env.close();
+        }
+    }
+
 public:
     void
     run() override
@@ -6026,6 +6225,7 @@ public:
         testMaxSupply(features);
         testMinMax(features);
         testHalving(features - featureOwnerPaysFee);
+        testBlackhole(features);
     }
 };
 

src/test/server/Server_test.cpp

@@ -144,6 +144,14 @@ public:
         {
         }
 
+        void
+        onUDPMessage(
+            std::string const& message,
+            boost::asio::ip::tcp::endpoint const& remoteEndpoint,
+            std::function<void(std::string const&)> sendResponse)
+        {
+        }
+
         void
         onClose(Session& session, boost::system::error_code const&)
         {
@@ -349,6 +357,14 @@ public:
             {
             }
 
+            void
+            onUDPMessage(
+                std::string const& message,
+                boost::asio::ip::tcp::endpoint const& remoteEndpoint,
+                std::function<void(std::string const&)> sendResponse)
+            {
+            }
+
             void
             onClose(Session& session, boost::system::error_code const&)
             {