From c1f9c56e5b5a2ebfb6013b4dd0644db97472103e Mon Sep 17 00:00:00 2001
From: Conner Fromknecht <conner@lightning.engineering>
Date: Mon, 30 Mar 2020 15:15:15 -0700
Subject: [PATCH] rpcserver: add self-node check in OpenChannelSync

---
 rpcserver.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rpcserver.go b/rpcserver.go
index f9753bbb..5ff15de2 100644
--- a/rpcserver.go
+++ b/rpcserver.go
@@ -1867,6 +1867,12 @@ func (r *rpcServer) OpenChannelSync(ctx context.Context,
 		}
 	}
 
+	// Making a channel to ourselves wouldn't be of any use, so we
+	// explicitly disallow them.
+	if nodePubKey.IsEqual(r.server.identityPriv.PubKey()) {
+		return nil, fmt.Errorf("cannot open channel to self")
+	}
+
 	localFundingAmt := btcutil.Amount(in.LocalFundingAmount)
 	remoteInitialBalance := btcutil.Amount(in.PushSat)
 	minHtlcIn := lnwire.MilliSatoshi(in.MinHtlcMsat)