Add rejecttokens policy option to filter out Runes

Author: luke-jr

src/init.cpp

@@ -664,6 +664,10 @@ void SetupServerArgs(ArgsManager& argsman)
                    OptionsCategory::NODE_RELAY);
     argsman.AddArg("-minrelaytxfee=<amt>", strprintf("Fees (in %s/kvB) smaller than this are considered zero fee for relaying, mining and transaction creation (default: %s)",
         CURRENCY_UNIT, FormatMoney(DEFAULT_MIN_RELAY_TX_FEE)), ArgsManager::ALLOW_ANY, OptionsCategory::NODE_RELAY);
+    argsman.AddArg("-rejecttokens",
+                   strprintf("Refuse to relay or mine transactions involving non-bitcoin tokens (default: %u)",
+                             DEFAULT_REJECT_TOKENS),
+                   ArgsManager::ALLOW_ANY, OptionsCategory::NODE_RELAY);
     argsman.AddArg("-spkreuse=<policy>", strprintf("Either \"allow\" to relay/mine transactions reusing addresses or other pubkey scripts, or \"conflict\" to treat them as exclusive prior to being mined (default: %s)", DEFAULT_SPKREUSE), ArgsManager::ALLOW_ANY, OptionsCategory::NODE_RELAY);
     argsman.AddArg("-whitelistforcerelay", strprintf("Add 'forcerelay' permission to whitelisted peers with default permissions. This will relay transactions even if the transactions were already in the mempool. (default: %d)", DEFAULT_WHITELISTFORCERELAY), ArgsManager::ALLOW_ANY, OptionsCategory::NODE_RELAY);
     argsman.AddArg("-whitelistrelay", strprintf("Add 'relay' permission to whitelisted peers with default permissions. This will accept relayed transactions even when not relaying transactions (default: %d)", DEFAULT_WHITELISTRELAY), ArgsManager::ALLOW_ANY, OptionsCategory::NODE_RELAY);

src/kernel/mempool_options.h

@@ -63,6 +63,7 @@ struct MemPoolOptions {
     bool datacarrier_fullcount{DEFAULT_DATACARRIER_FULLCOUNT};
     bool permit_bare_pubkey{DEFAULT_PERMIT_BAREPUBKEY};
     bool permit_bare_multisig{DEFAULT_PERMIT_BAREMULTISIG};
+    bool reject_tokens{DEFAULT_REJECT_TOKENS};
     bool accept_non_std_datacarrier{DEFAULT_ACCEPT_NON_STD_DATACARRIER};
     bool require_standard{true};
     RBFPolicy rbf_policy{DEFAULT_MEMPOOL_RBF_POLICY};

src/node/mempool_args.cpp

@@ -85,6 +85,8 @@ util::Result<void> ApplyArgsManOptions(const ArgsManager& argsman, const CChainP
 
     mempool_opts.permit_bare_multisig = argsman.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
 
+    mempool_opts.reject_tokens = argsman.GetBoolArg("-rejecttokens", DEFAULT_REJECT_TOKENS);
+
     if (argsman.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER)) {
         mempool_opts.max_datacarrier_bytes = argsman.GetIntArg("-datacarriersize", MAX_OP_RETURN_RELAY);
     } else {

src/policy/policy.cpp

@@ -159,6 +159,9 @@ bool IsStandardTx(const CTransaction& tx, const kernel::MemPoolOptions& opts, st
         }
 
         if (whichType == TxoutType::NULL_DATA) {
+            if (txout.scriptPubKey.size() > 2 && txout.scriptPubKey[1] == OP_13 && opts.reject_tokens) {
+                MaybeReject("tokens-runes");
+            }
             nDataOut++;
             continue;
         }

src/policy/policy.h

@@ -50,6 +50,8 @@ static constexpr unsigned int DEFAULT_BYTES_PER_SIGOP{20};
 static constexpr unsigned int DEFAULT_BYTES_PER_SIGOP_STRICT{20};
 /** Default for -datacarriercost (multiplied by WITNESS_SCALE_FACTOR) */
 static constexpr unsigned int DEFAULT_WEIGHT_PER_DATA_BYTE{1};
+/** Default for -rejecttokens */
+static constexpr bool DEFAULT_REJECT_TOKENS{false};
 /** Default for -permitbarepubkey */
 static constexpr bool DEFAULT_PERMIT_BAREPUBKEY{true};
 /** Default for -permitbaremultisig */