init: add -cleanupaddrman

This flag is used to control whether the user wants
to clean up addresses from addrman that do not
belong to the current supported network.

src/init.cpp

@@ -534,6 +534,7 @@ void SetupServerArgs(ArgsManager& argsman)
     argsman.AddArg("-i2psam=<ip:port>", "I2P SAM proxy to reach I2P peers and accept I2P connections (default: none)", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-i2pacceptincoming", strprintf("Whether to accept inbound I2P connections (default: %i). Ignored if -i2psam is not set. Listening for inbound I2P connections is done through the SAM proxy, not by binding to a local address and port.", DEFAULT_I2P_ACCEPT_INCOMING), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-onlynet=<net>", "Make automatic outbound connections only to network <net> (" + Join(GetNetworkNames(), ", ") + "). Inbound and manual connections are not affected by this option. It can be specified multiple times to allow multiple networks.", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
+    argsman.AddArg("-cleanupaddrman", strprintf("Clean up addresses from addrman that do not belong to the supported networks (default: %u)", DEFAULT_CLEANUP_ADDRMAN), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-v2transport", strprintf("Support v2 transport (default: %u)", DEFAULT_V2_TRANSPORT), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-peerbloomfilters", strprintf("Support filtering of blocks and transaction with bloom filters (default: %u)", DEFAULT_PEERBLOOMFILTERS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     argsman.AddArg("-peerblockfilters", strprintf("Serve compact block filters to peers per BIP 157 (default: %u)", DEFAULT_PEERBLOCKFILTERS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
@@ -1899,13 +1900,15 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
 
     connOptions.m_i2p_accept_incoming = args.GetBoolArg("-i2pacceptincoming", DEFAULT_I2P_ACCEPT_INCOMING);
 
-    std::set<Network> networks;
-    for (size_t i = 0; i < NET_MAX; ++i) {
-        Network net = static_cast<Network>(i);
-        if (g_reachable_nets.Contains(net)) networks.insert(net);
+    if (args.GetBoolArg("-cleanupaddrman", DEFAULT_CLEANUP_ADDRMAN)) {
+        std::set<Network> networks;
+        for (size_t i = 0; i < NET_MAX; ++i) {
+            Network net = static_cast<Network>(i);
+            if (g_reachable_nets.Contains(net)) networks.insert(net);
+        }
+        AddrMan& node_addrman = *node.addrman;
+        node_addrman.DeleteAddresses(networks);
     }
-    AddrMan& node_addrman = *node.addrman;
-    node_addrman.DeleteAddresses(networks);
 
     if (!node.connman->Start(*node.scheduler, connOptions)) {
         return false;

src/net.h

@@ -99,6 +99,8 @@ static const size_t DEFAULT_MAXSENDBUFFER    = 1 * 1000;
 
 static constexpr bool DEFAULT_V2_TRANSPORT{false};
 
+static constexpr bool DEFAULT_CLEANUP_ADDRMAN{false};
+
 typedef int64_t NodeId;
 
 struct AddedNodeParams {