lightning/wire/peer_wire.c

#include <wire/peer_wire.h>

static bool unknown_type(enum wire_type t)
{
	switch (t) {
	case WIRE_INIT:
	case WIRE_ERROR:
	case WIRE_OPEN_CHANNEL:
	case WIRE_ACCEPT_CHANNEL:
	case WIRE_FUNDING_CREATED:
	case WIRE_FUNDING_SIGNED:
	case WIRE_FUNDING_LOCKED:
	case WIRE_SHUTDOWN:
	case WIRE_CLOSING_SIGNED:
	case WIRE_UPDATE_ADD_HTLC:
	case WIRE_UPDATE_FULFILL_HTLC:
	case WIRE_UPDATE_FAIL_HTLC:
	case WIRE_UPDATE_FAIL_MALFORMED_HTLC:
	case WIRE_COMMITMENT_SIGNED:
	case WIRE_REVOKE_AND_ACK:
	case WIRE_UPDATE_FEE:
	case WIRE_CHANNEL_REESTABLISH:
	case WIRE_ANNOUNCEMENT_SIGNATURES:
	case WIRE_CHANNEL_ANNOUNCEMENT:
	case WIRE_NODE_ANNOUNCEMENT:
	case WIRE_CHANNEL_UPDATE:
	case WIRE_PING:
	case WIRE_PONG:
		return false;
	}
	return true;
}

bool is_gossip_msg(const u8 *cursor)
{
	switch (fromwire_peektype(cursor)) {
	case WIRE_CHANNEL_ANNOUNCEMENT:
	case WIRE_NODE_ANNOUNCEMENT:
	case WIRE_CHANNEL_UPDATE:
		return true;
	case WIRE_INIT:
	case WIRE_ERROR:
	case WIRE_OPEN_CHANNEL:
	case WIRE_ACCEPT_CHANNEL:
	case WIRE_FUNDING_CREATED:
	case WIRE_FUNDING_SIGNED:
	case WIRE_FUNDING_LOCKED:
	case WIRE_SHUTDOWN:
	case WIRE_CLOSING_SIGNED:
	case WIRE_UPDATE_ADD_HTLC:
	case WIRE_UPDATE_FULFILL_HTLC:
	case WIRE_UPDATE_FAIL_HTLC:
	case WIRE_UPDATE_FAIL_MALFORMED_HTLC:
	case WIRE_COMMITMENT_SIGNED:
	case WIRE_REVOKE_AND_ACK:
	case WIRE_UPDATE_FEE:
	case WIRE_PING:
	case WIRE_PONG:
		break;
	}
	return false;
}

/* Return true if it's an unknown message.  cursor is a tal ptr. */
bool is_unknown_msg(const u8 *cursor)
{
	return unknown_type(fromwire_peektype(cursor));
}

/* Return true if it's an unknown ODD message.  cursor is a tal ptr. */
bool is_unknown_msg_discardable(const u8 *cursor)
{
	enum wire_type t = fromwire_peektype(cursor);
	return unknown_type(t) && (t & 1);
}

/* Extract channel_id from various packets, return true if possible. */
bool extract_channel_id(const u8 *in_pkt, struct channel_id *channel_id)
{
	u64 ignored_u64;
	u32 ignored_u32;
	u16 ignored_u16;
	u8 ignored_u8;
	struct pubkey ignored_pubkey;
	struct bitcoin_blkid ignored_chainhash;

	if (fromwire_channel_reestablish(in_pkt, NULL, channel_id,
					 &ignored_u64, &ignored_u64))
		return true;
	if (fromwire_open_channel(in_pkt, NULL, &ignored_chainhash,
				  channel_id, &ignored_u64,
				  &ignored_u64, &ignored_u64,
				  &ignored_u64, &ignored_u64,
				  &ignored_u64, &ignored_u32,
				  &ignored_u16, &ignored_u16,
				  &ignored_pubkey, &ignored_pubkey,
				  &ignored_pubkey, &ignored_pubkey,
				  &ignored_pubkey, &ignored_pubkey,
				  &ignored_u8))
		return true;
	return false;
}