From cb2cad8c940998e75a7921da1c209d9cd43b1007 Mon Sep 17 00:00:00 2001
From: lisa neigut <niftynei@gmail.com>
Date: Wed, 18 Sep 2019 19:02:20 -0500
Subject: [PATCH] script: add helper for checking if a 'known type'

To be used for verifying remote inputs' validity
---
 bitcoin/script.c | 6 ++++++
 bitcoin/script.h | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/bitcoin/script.c b/bitcoin/script.c
index 58cdd4e19..060cfc829 100644
--- a/bitcoin/script.c
+++ b/bitcoin/script.c
@@ -436,6 +436,12 @@ bool is_p2wpkh(const u8 *script, struct bitcoin_address *addr)
 	return true;
 }
 
+bool is_known_scripttype(const u8 *script)
+{
+	return is_p2wpkh(script, NULL) || is_p2wsh(script, NULL)
+		|| is_p2sh(script, NULL) || is_p2pkh(script, NULL);
+}
+
 u8 **bitcoin_witness_sig_and_element(const tal_t *ctx,
 				     const struct bitcoin_signature *sig,
 				     const void *elem, size_t elemsize,
diff --git a/bitcoin/script.h b/bitcoin/script.h
index f15e893f5..69f46fcde 100644
--- a/bitcoin/script.h
+++ b/bitcoin/script.h
@@ -135,6 +135,9 @@ bool is_p2wsh(const u8 *script, struct sha256 *addr);
 /* Is this (version 0) pay to witness pubkey hash? (extract addr if not NULL) */
 bool is_p2wpkh(const u8 *script, struct bitcoin_address *addr);
 
+/* Is this one of the four above script types? */
+bool is_known_scripttype(const u8 *script);
+
 /* Are these two scripts equal? */
 bool scripteq(const u8 *s1, const u8 *s2);