btcd: add TestNet4 config param

config.go

@@ -171,7 +171,8 @@ type config struct {
 	SigNet               bool          `long:"signet" description:"Use the signet test network"`
 	SigNetChallenge      string        `long:"signetchallenge" description:"Connect to a custom signet network defined by this challenge instead of using the global default signet test network -- Can be specified multiple times"`
 	SigNetSeedNode       []string      `long:"signetseednode" description:"Specify a seed node for the signet network instead of using the global default signet network seed nodes"`
-	TestNet3             bool          `long:"testnet" description:"Use the test network"`
+	TestNet3             bool          `long:"testnet" description:"Use the test network (version 3)"`
+	TestNet4             bool          `long:"testnet4" description:"Use the test network (version 4)"`
 	TorIsolation         bool          `long:"torisolation" description:"Enable Tor stream isolation by randomizing user credentials for each connection."`
 	TrickleInterval      time.Duration `long:"trickleinterval" description:"Minimum time between attempts to send new inventory to a connected peer"`
 	UtxoCacheMaxSizeMiB  uint          `long:"utxocachemaxsize" description:"The maximum size in MiB of the UTXO cache"`
@@ -548,6 +549,10 @@ func loadConfig() (*config, []string, error) {
 		numNets++
 		activeNetParams = &testNet3Params
 	}
+	if cfg.TestNet4 {
+		numNets++
+		activeNetParams = &testNet4Params
+	}
 	if cfg.RegressionTest {
 		numNets++
 		activeNetParams = &regressionNetParams

params.go

@@ -48,6 +48,14 @@ var testNet3Params = params{
 	rpcPort: "18334",
 }
 
+// testNet4Params contains parameters specific to the test network (version 4)
+// (wire.TestNet4).  NOTE: The RPC port is intentionally different from the
+// reference implementation - see the mainNetParams comment for details.
+var testNet4Params = params{
+	Params:  &chaincfg.TestNet4Params,
+	rpcPort: "48334",
+}
+
 // simNetParams contains parameters specific to the simulation test network
 // (wire.SimNet).
 var simNetParams = params{

rpcserver.go

@@ -2358,7 +2358,7 @@ func handleGetInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{}) (in
 		Connections:     s.cfg.ConnMgr.ConnectedCount(),
 		Proxy:           cfg.Proxy,
 		Difficulty:      getDifficultyRatio(best.Bits, s.cfg.ChainParams),
-		TestNet:         cfg.TestNet3,
+		TestNet:         cfg.TestNet3 || cfg.TestNet4,
 		RelayFee:        cfg.minRelayTxFee.ToBTC(),
 	}
 
@@ -2413,7 +2413,7 @@ func handleGetMiningInfo(s *rpcServer, cmd interface{}, closeChan <-chan struct{
 		HashesPerSec:       s.cfg.CPUMiner.HashesPerSecond(),
 		NetworkHashPS:      networkHashesPerSec,
 		PooledTx:           uint64(s.cfg.TxMemPool.Count()),
-		TestNet:            cfg.TestNet3,
+		TestNet:            cfg.TestNet3 || cfg.TestNet4,
 	}
 	return &result, nil
 }