Merge bitcoin/bitcoin#21359: rpc: include_unsafe option for fundrawtransaction

11d6459b6e101f05f36e13799c400bef82d2fc21 rpc: include_unsafe option for fundrawtransaction (t-bast)

Pull request description:

  Allow RPC users to opt-in to unsafe inputs when funding a raw transaction.

  Applications that need to manage a complex RBF flow (such as lightning nodes using anchor outputs) are very limited if they can only use safe inputs.

  I also added this option to `send` and `walletcreatefundedpsbt` who internally delegate to `fundrawtransaction`.

  Fixes #21299

ACKs for top commit:
  laanwj:
    Code review ACK 11d6459b6e101f05f36e13799c400bef82d2fc21

Tree-SHA512: 5e542a4febcfd6f41cf784678ff02ec9282eae2082c274983f72c5ea87b7ebbe1bd5fdc6a020d7a9d5996157754eb4966b8aeb6c1ceebf0b1519f735579b8bac

1 files changed, 10 insertions, 3 deletions

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index d90cc58b88..60d60d1e81 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2516,8 +2516,7 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
         if (SelectCoinsMinConf(value_to_select, CoinEligibilityFilter(1, 1, 0), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) return true;
 
         // Fall back to using zero confirmation change (but with as few ancestors in the mempool as
-        // possible) if we cannot fund the transaction otherwise. We never spend unconfirmed
-        // outputs received from other wallets.
+        // possible) if we cannot fund the transaction otherwise.
         if (m_spend_zero_conf_change) {
             if (SelectCoinsMinConf(value_to_select, CoinEligibilityFilter(0, 1, 2), vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) return true;
             if (SelectCoinsMinConf(value_to_select, CoinEligibilityFilter(0, 1, std::min((size_t)4, max_ancestors/3), std::min((size_t)4, max_descendants/3)),
@@ -2535,6 +2534,14 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
                                    vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) {
                 return true;
             }
+            // Try with unsafe inputs if they are allowed. This may spend unconfirmed outputs
+            // received from other wallets.
+            if (coin_control.m_include_unsafe_inputs
+                && SelectCoinsMinConf(value_to_select,
+                    CoinEligibilityFilter(0 /* conf_mine */, 0 /* conf_theirs */, max_ancestors-1, max_descendants-1, true /* include_partial_groups */),
+                    vCoins, setCoinsRet, nValueRet, coin_selection_params, bnb_used)) {
+                return true;
+            }
             // Try with unlimited ancestors/descendants. The transaction will still need to meet
             // mempool ancestor/descendant policy to be accepted to mempool and broadcasted, but
             // OutputGroups use heuristics that may overestimate ancestor/descendant counts.
@@ -2836,7 +2843,7 @@ bool CWallet::CreateTransactionInternal(
         txNew.nLockTime = GetLocktimeForNewTransaction(chain(), GetLastBlockHash(), GetLastBlockHeight());
         {
             std::vector<COutput> vAvailableCoins;
-            AvailableCoins(vAvailableCoins, true, &coin_control, 1, MAX_MONEY, MAX_MONEY, 0);
+            AvailableCoins(vAvailableCoins, !coin_control.m_include_unsafe_inputs, &coin_control, 1, MAX_MONEY, MAX_MONEY, 0);
             CoinSelectionParams coin_selection_params; // Parameters for coin selection, init with dummy
             coin_selection_params.m_avoid_partial_spends = coin_control.m_avoid_partial_spends;