hsmd: make the negotiated hsmd version available to libhsmd

Changelog-None: hsmd internals

Author: ksedgwic

hsmd/hsmd.c

@@ -490,8 +490,8 @@ static struct io_plan *init_hsm(struct io_conn *conn,
 		discard_key(take(hsm_encryption_key));
 
 	/* Define the minimum common max version for the hsmd one */
-	u64 mutual_version = maxversion < our_maxversion ? maxversion : our_maxversion;
-	return req_reply(conn, c, hsmd_init(hsm_secret, mutual_version,
+	hsmd_mutual_version = maxversion < our_maxversion ? maxversion : our_maxversion;
+	return req_reply(conn, c, hsmd_init(hsm_secret, hsmd_mutual_version,
 					    bip32_key_version));
 }
 

hsmd/libhsmd.c

@@ -16,6 +16,9 @@
 #include <sodium/utils.h>
 #include <wally_psbt.h>
 
+/* The negotiated protocol version ends up in here. */
+u64 hsmd_mutual_version;
+
 /* If they specify --dev-force-privkey it ends up in here. */
 struct privkey *dev_force_privkey;
 /* If they specify --dev-force-bip32-seed it ends up in here. */

hsmd/libhsmd.h

@@ -89,6 +89,9 @@ void hsmd_status_failed(enum status_failreason code,
 bool hsmd_check_client_capabilities(struct hsmd_client *client,
 				    enum hsmd_wire t);
 
+/* The negotiated protocol version ends up in here. */
+extern u64 hsmd_mutual_version;
+
 /* If they specify --dev-force-privkey it ends up in here. */
 extern struct privkey *dev_force_privkey;
 /* If they specify --dev-force-bip32-seed it ends up in here. */