opening: Pass network_index through to openingd

This is needed in order to open channels with the correct
genesis_blockhash.

Reported-By: @sstone

lightningd/opening/opening.c

@@ -691,6 +691,7 @@ int main(int argc, char *argv[])
 	u8 channel_flags;
 	struct utxo *utxos;
 	u8 *bip32_seed;
+	u32 network_index;
 
 	if (argc == 2 && streq(argv[1], "--version")) {
 		printf("%s\n", version());
@@ -710,6 +711,7 @@ int main(int argc, char *argv[])
 		status_failed(WIRE_OPENING_BAD_COMMAND, "%s", strerror(errno));
 
 	if (!fromwire_opening_init(msg, NULL,
+				   &network_index,
 				   &state->localconf,
 				   &state->max_to_self_delay,
 				   &state->min_effective_htlc_capacity_msat,

lightningd/opening/opening_wire.csv

@@ -14,6 +14,8 @@ opening_peer_bad_initial_message,0x8014
 #include <lightningd/cryptomsg.h>
 #include <lightningd/channel_config.h>
 opening_init,0
+# Which network are we configured for (as index into the chainparams)?
+opening_init,,network_index,4
 # Base configuration we'll offer (channel reserve will vary with amount)
 opening_init,,our_config,struct channel_config
 # Minimum/maximum configuration values we'll accept

lightningd/peer_control.c

@@ -1916,7 +1916,8 @@ void peer_fundee_open(struct peer *peer, const u8 *from_peer,
 
 	peer->seed = tal(peer, struct privkey);
 	derive_peer_seed(ld, peer->seed, &peer->id);
-	msg = towire_opening_init(peer, &peer->our_config,
+	msg = towire_opening_init(peer, ld->chainparams->index,
+				  &peer->our_config,
 				  max_to_self_delay,
 				  min_effective_htlc_capacity_msat,
 				  cs, peer->seed);
@@ -1986,7 +1987,8 @@ static bool gossip_peer_released(struct subd *gossip,
 
 	fc->peer->seed = tal(fc->peer, struct privkey);
 	derive_peer_seed(ld, fc->peer->seed, &fc->peer->id);
-	msg = towire_opening_init(fc, &fc->peer->our_config,
+	msg = towire_opening_init(fc, ld->chainparams->index,
+				  &fc->peer->our_config,
 				  max_to_self_delay,
 				  min_effective_htlc_capacity_msat,
 				  &cs, fc->peer->seed);