|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "net" |
| 6 | + "strconv" |
| 7 | + "strings" |
| 8 | + "time" |
| 9 | + |
| 10 | + "github.com/btcsuite/btcd/chaincfg/chainhash" |
| 11 | + "github.com/btcsuite/btcd/connmgr" |
| 12 | + "github.com/btcsuite/btcd/wire" |
| 13 | + "github.com/guggero/chantools/btc" |
| 14 | + "github.com/guggero/chantools/lnd" |
| 15 | + "github.com/lightningnetwork/lnd/brontide" |
| 16 | + "github.com/lightningnetwork/lnd/keychain" |
| 17 | + "github.com/lightningnetwork/lnd/lncfg" |
| 18 | + "github.com/lightningnetwork/lnd/lnwire" |
| 19 | + "github.com/lightningnetwork/lnd/tor" |
| 20 | + "github.com/spf13/cobra" |
| 21 | +) |
| 22 | + |
| 23 | +var ( |
| 24 | + dialTimeout = time.Minute |
| 25 | +) |
| 26 | + |
| 27 | +type triggerForceCloseCommand struct { |
| 28 | + Peer string |
| 29 | + ChannelPoint string |
| 30 | + |
| 31 | + APIURL string |
| 32 | + |
| 33 | + rootKey *rootKey |
| 34 | + cmd *cobra.Command |
| 35 | +} |
| 36 | + |
| 37 | +func newTriggerForceCloseCommand() *cobra.Command { |
| 38 | + cc := &triggerForceCloseCommand{} |
| 39 | + cc.cmd = &cobra.Command{ |
| 40 | + Use: "triggerforceclose", |
| 41 | + Short: "Connect to a peer and send a custom message to " + |
| 42 | + "trigger a force close of the specified channel", |
| 43 | + Example: `chantools triggerforceclose \ |
| 44 | + |
| 45 | + --channel_point abcdef01234...:x`, |
| 46 | + RunE: cc.Execute, |
| 47 | + } |
| 48 | + cc.cmd.Flags().StringVar( |
| 49 | + &cc.Peer, "peer", "", "remote peer address "+ |
| 50 | + "(<pubkey>@<host>[:<port>])", |
| 51 | + ) |
| 52 | + cc.cmd.Flags().StringVar( |
| 53 | + &cc.ChannelPoint, "channel_point", "", "funding transaction "+ |
| 54 | + "outpoint of the channel to trigger the force close "+ |
| 55 | + "of (<txid>:<txindex>)", |
| 56 | + ) |
| 57 | + cc.cmd.Flags().StringVar( |
| 58 | + &cc.APIURL, "apiurl", defaultAPIURL, "API URL to use (must "+ |
| 59 | + "be esplora compatible)", |
| 60 | + ) |
| 61 | + cc.rootKey = newRootKey(cc.cmd, "deriving the identity key") |
| 62 | + |
| 63 | + return cc.cmd |
| 64 | +} |
| 65 | + |
| 66 | +func (c *triggerForceCloseCommand) Execute(_ *cobra.Command, _ []string) error { |
| 67 | + extendedKey, err := c.rootKey.read() |
| 68 | + if err != nil { |
| 69 | + return fmt.Errorf("error reading root key: %w", err) |
| 70 | + } |
| 71 | + |
| 72 | + identityPath := lnd.IdentityPath(chainParams) |
| 73 | + child, pubKey, _, err := lnd.DeriveKey( |
| 74 | + extendedKey, identityPath, chainParams, |
| 75 | + ) |
| 76 | + if err != nil { |
| 77 | + return fmt.Errorf("could not derive identity key: %w", err) |
| 78 | + } |
| 79 | + identityPriv, err := child.ECPrivKey() |
| 80 | + if err != nil { |
| 81 | + return fmt.Errorf("could not get identity private key: %w", err) |
| 82 | + } |
| 83 | + identityECDH := &keychain.PrivKeyECDH{ |
| 84 | + PrivKey: identityPriv, |
| 85 | + } |
| 86 | + |
| 87 | + peerAddr, err := lncfg.ParseLNAddressString( |
| 88 | + c.Peer, "9735", net.ResolveTCPAddr, |
| 89 | + ) |
| 90 | + if err != nil { |
| 91 | + return fmt.Errorf("error parsing peer address: %w", err) |
| 92 | + } |
| 93 | + |
| 94 | + outPoint, err := parseOutPoint(c.ChannelPoint) |
| 95 | + if err != nil { |
| 96 | + return fmt.Errorf("error parsing channel point: %w", err) |
| 97 | + } |
| 98 | + channelID := lnwire.NewChanIDFromOutPoint(outPoint) |
| 99 | + |
| 100 | + conn, err := noiseDial( |
| 101 | + identityECDH, peerAddr, &tor.ClearNet{}, dialTimeout, |
| 102 | + ) |
| 103 | + if err != nil { |
| 104 | + return fmt.Errorf("error dialing peer: %w", err) |
| 105 | + } |
| 106 | + |
| 107 | + log.Infof("Attempting to connect to peer %x, dial timeout is %v", |
| 108 | + pubKey.SerializeCompressed(), dialTimeout) |
| 109 | + req := &connmgr.ConnReq{ |
| 110 | + Addr: peerAddr, |
| 111 | + Permanent: false, |
| 112 | + } |
| 113 | + p, err := lnd.ConnectPeer(conn, req, chainParams, identityECDH) |
| 114 | + if err != nil { |
| 115 | + return fmt.Errorf("error connecting to peer: %w", err) |
| 116 | + } |
| 117 | + |
| 118 | + log.Infof("Connection established to peer %x", |
| 119 | + pubKey.SerializeCompressed()) |
| 120 | + |
| 121 | + // We'll wait until the peer is active. |
| 122 | + select { |
| 123 | + case <-p.ActiveSignal(): |
| 124 | + case <-p.QuitSignal(): |
| 125 | + return fmt.Errorf("peer %x disconnected", |
| 126 | + pubKey.SerializeCompressed()) |
| 127 | + } |
| 128 | + |
| 129 | + // Channel ID (32 byte) + u16 for the data length (which will be 0). |
| 130 | + data := make([]byte, 34) |
| 131 | + copy(data[:32], channelID[:]) |
| 132 | + |
| 133 | + log.Infof("Sending channel error message to peer to trigger force "+ |
| 134 | + "close of channel %v", c.ChannelPoint) |
| 135 | + |
| 136 | + _ = lnwire.SetCustomOverrides([]uint16{lnwire.MsgError}) |
| 137 | + msg, err := lnwire.NewCustom(lnwire.MsgError, data) |
| 138 | + if err != nil { |
| 139 | + return err |
| 140 | + } |
| 141 | + |
| 142 | + err = p.SendMessageLazy(true, msg) |
| 143 | + if err != nil { |
| 144 | + return fmt.Errorf("error sending message: %w", err) |
| 145 | + } |
| 146 | + |
| 147 | + log.Infof("Message sent, waiting for force close transaction to " + |
| 148 | + "appear in mempool") |
| 149 | + |
| 150 | + api := &btc.ExplorerAPI{BaseURL: c.APIURL} |
| 151 | + channelAddress, err := api.Address(c.ChannelPoint) |
| 152 | + if err != nil { |
| 153 | + return fmt.Errorf("error getting channel address: %w", err) |
| 154 | + } |
| 155 | + |
| 156 | + spends, err := api.Spends(channelAddress) |
| 157 | + if err != nil { |
| 158 | + return fmt.Errorf("error getting spends: %w", err) |
| 159 | + } |
| 160 | + for len(spends) == 0 { |
| 161 | + log.Infof("No spends found yet, waiting 5 seconds...") |
| 162 | + time.Sleep(5 * time.Second) |
| 163 | + spends, err = api.Spends(channelAddress) |
| 164 | + if err != nil { |
| 165 | + return fmt.Errorf("error getting spends: %w", err) |
| 166 | + } |
| 167 | + } |
| 168 | + |
| 169 | + log.Infof("Found force close transaction %v", spends[0].TXID) |
| 170 | + log.Infof("You can now use the sweepremoteclosed command to sweep " + |
| 171 | + "the funds from the channel") |
| 172 | + |
| 173 | + return nil |
| 174 | +} |
| 175 | + |
| 176 | +func noiseDial(idKey keychain.SingleKeyECDH, lnAddr *lnwire.NetAddress, |
| 177 | + netCfg tor.Net, timeout time.Duration) (*brontide.Conn, error) { |
| 178 | + |
| 179 | + return brontide.Dial(idKey, lnAddr, timeout, netCfg.Dial) |
| 180 | +} |
| 181 | + |
| 182 | +func parseOutPoint(s string) (*wire.OutPoint, error) { |
| 183 | + split := strings.Split(s, ":") |
| 184 | + if len(split) != 2 || len(split[0]) == 0 || len(split[1]) == 0 { |
| 185 | + return nil, fmt.Errorf("invalid channel point format: %v", s) |
| 186 | + } |
| 187 | + |
| 188 | + index, err := strconv.ParseInt(split[1], 10, 64) |
| 189 | + if err != nil { |
| 190 | + return nil, fmt.Errorf("unable to decode output index: %v", err) |
| 191 | + } |
| 192 | + |
| 193 | + txid, err := chainhash.NewHashFromStr(split[0]) |
| 194 | + if err != nil { |
| 195 | + return nil, fmt.Errorf("unable to parse hex string: %v", err) |
| 196 | + } |
| 197 | + |
| 198 | + return &wire.OutPoint{ |
| 199 | + Hash: *txid, |
| 200 | + Index: uint32(index), |
| 201 | + }, nil |
| 202 | +} |
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