From: Matt Corallo <git@bluematt.me>
Date: Tue, 4 May 2021 17:44:04 +0000 (+0000)
Subject: Check that the node we connect to matches the user-provided chain
X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=ldk-sample;a=commitdiff_plain;h=cae92e8b151d8459fee7a7eb0b823c25951363f5

Check that the node we connect to matches the user-provided chain
---

diff --git a/src/convert.rs b/src/convert.rs
index 7dbd8cc..a652980 100644
--- a/src/convert.rs
+++ b/src/convert.rs
@@ -72,6 +72,7 @@ impl TryInto<FeeResponse> for JsonResponse {
 pub struct BlockchainInfo {
 	pub latest_height: usize,
 	pub latest_blockhash: BlockHash,
+	pub chain: String,
 }
 
 impl TryInto<BlockchainInfo> for JsonResponse {
@@ -81,6 +82,7 @@ impl TryInto<BlockchainInfo> for JsonResponse {
 			latest_height: self.0["blocks"].as_u64().unwrap() as usize,
 			latest_blockhash: BlockHash::from_hex(self.0["bestblockhash"].as_str().unwrap())
 				.unwrap(),
+			chain: self.0["chain"].as_str().unwrap().to_string(),
 		})
 	}
 }
diff --git a/src/main.rs b/src/main.rs
index 21dfb28..7f4b5bf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -290,6 +290,18 @@ async fn start_ldk() {
 		}
 	};
 
+	// Check that the bitcoind we've connected to is running the network we expect
+	let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
+	if bitcoind_chain != match args.network {
+		bitcoin::Network::Bitcoin => "main",
+		bitcoin::Network::Testnet => "test",
+		bitcoin::Network::Regtest => "regtest",
+		bitcoin::Network::Signet => "signet",
+	} {
+		println!("Chain argument ({}) didn't match bitcoind chain ({})", args.network, bitcoind_chain);
+		return;
+	}
+
 	// ## Setup
 	// Step 1: Initialize the FeeEstimator