13211764208

Committed 08 Feb 2025 03:08AM UTC coverage: 49.288% (-9.5%) from 58.815%

Build # 13211764208

Build Type

Pull #9489

github

Committed by

calvinrzachman

Commit Message

itest: verify switchrpc server enforces send then track

We prevent the rpc server from allowing onion dispatches for
attempt IDs which have already been tracked by rpc clients.

This helps protect the client from leaking a duplicate onion
attempt. NOTE: This is not the only method for solving this
issue! The issue could be addressed via careful client side
programming which accounts for the uncertainty and async
nature of dispatching onions to a remote process via RPC.
This would require some lnd ChannelRouter changes for how
we intend to use these RPCs though.

Pull Request Pull Request #9489: multi: add BuildOnion, SendOnion, and TrackOnion RPCs

Run Details

474 of 990 new or added lines in 11 files covered. (47.88%)

27321 existing lines in 435 files now uncovered.

101192 of 205306 relevant lines covered (49.29%)

1.54 hits per line

Source File
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46.48

/lnwire/lnwire.go

package lnwire

import (
        "bytes"
        "encoding/binary"
        "fmt"
        "image/color"
        "io"
        "math"
        "net"

        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/btcsuite/btcd/wire"
        "github.com/go-errors/errors"
        "github.com/lightningnetwork/lnd/tor"
)

const (
        // MaxSliceLength is the maximum allowed length for any opaque byte
        // slices in the wire protocol.
        MaxSliceLength = 65535

        // MaxMsgBody is the largest payload any message is allowed to provide.
        // This is two less than the MaxSliceLength as each message has a 2
        // byte type that precedes the message body.
        MaxMsgBody = 65533
)

// PkScript is simple type definition which represents a raw serialized public
// key script.
type PkScript []byte

// addressType specifies the network protocol and version that should be used
// when connecting to a node at a particular address.
type addressType uint8

const (
        // noAddr denotes a blank address. An address of this type indicates
        // that a node doesn't have any advertised addresses.
        noAddr addressType = 0

        // tcp4Addr denotes an IPv4 TCP address.
        tcp4Addr addressType = 1

        // tcp6Addr denotes an IPv6 TCP address.
        tcp6Addr addressType = 2

        // v2OnionAddr denotes a version 2 Tor onion service address.
        v2OnionAddr addressType = 3

        // v3OnionAddr denotes a version 3 Tor (prop224) onion service address.
        v3OnionAddr addressType = 4
)

// AddrLen returns the number of bytes that it takes to encode the target
// address.
func (a addressType) AddrLen() uint16 {
        switch a {
        case noAddr:
                return 0
        case tcp4Addr:
                return 6
        case tcp6Addr:
                return 18
        case v2OnionAddr:
                return 12
        case v3OnionAddr:
                return 37
        default:
                return 0
        }
}

// WriteElement is a one-stop shop to write the big endian representation of
// any element which is to be serialized for the wire protocol.
//
// TODO(yy): rm this method once we finish dereferencing it from other
// packages.
func WriteElement(w *bytes.Buffer, element interface{}) error {
        switch e := element.(type) {
        case NodeAlias:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case QueryEncoding:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint8:
                var b [1]byte
                b[0] = e
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case FundingFlag:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint16:
                var b [2]byte
                binary.BigEndian.PutUint16(b[:], e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case ChanUpdateMsgFlags:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case ChanUpdateChanFlags:
                var b [1]byte
                b[0] = uint8(e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case MilliSatoshi:
                var b [8]byte
                binary.BigEndian.PutUint64(b[:], uint64(e))
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case btcutil.Amount:
                var b [8]byte
                binary.BigEndian.PutUint64(b[:], uint64(e))
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint32:
                var b [4]byte
                binary.BigEndian.PutUint32(b[:], e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case uint64:
                var b [8]byte
                binary.BigEndian.PutUint64(b[:], e)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case *btcec.PublicKey:
                if e == nil {
                        return fmt.Errorf("cannot write nil pubkey")
                }

                var b [33]byte
                serializedPubkey := e.SerializeCompressed()
                copy(b[:], serializedPubkey)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case []Sig:
                var b [2]byte
                numSigs := uint16(len(e))
                binary.BigEndian.PutUint16(b[:], numSigs)
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

                for _, sig := range e {
                        if err := WriteElement(w, sig); err != nil {
                                return err
                        }
                }

        case Sig:
                // Write buffer
                if _, err := w.Write(e.bytes[:]); err != nil {
                        return err
                }

        case PartialSig:
                if err := e.Encode(w); err != nil {
                        return err
                }

        case PingPayload:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case PongPayload:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case WarningData:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case ErrorData:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case OpaqueReason:
                var l [2]byte
                binary.BigEndian.PutUint16(l[:], uint16(len(e)))
                if _, err := w.Write(l[:]); err != nil {
                        return err
                }

                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case [33]byte:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case []byte:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case PkScript:
                // The largest script we'll accept is a p2wsh which is exactly
                // 34 bytes long.
                scriptLength := len(e)
                if scriptLength > 34 {
                        return fmt.Errorf("'PkScript' too long")
                }

                if err := wire.WriteVarBytes(w, 0, e); err != nil {
                        return err
                }

        case *RawFeatureVector:
                if e == nil {
                        return fmt.Errorf("cannot write nil feature vector")
                }

                if err := e.Encode(w); err != nil {
                        return err
                }

        case wire.OutPoint:
                var h [32]byte
                copy(h[:], e.Hash[:])
                if _, err := w.Write(h[:]); err != nil {
                        return err
                }

                if e.Index > math.MaxUint16 {
                        return fmt.Errorf("index for outpoint (%v) is "+
                                "greater than max index of %v", e.Index,
                                math.MaxUint16)
                }

                var idx [2]byte
                binary.BigEndian.PutUint16(idx[:], uint16(e.Index))
                if _, err := w.Write(idx[:]); err != nil {
                        return err
                }

        case ChannelID:
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case FailCode:
                if err := WriteElement(w, uint16(e)); err != nil {
                        return err
                }

        case ShortChannelID:
                // Check that field fit in 3 bytes and write the blockHeight
                if e.BlockHeight > ((1 << 24) - 1) {
                        return errors.New("block height should fit in 3 bytes")
                }

                var blockHeight [4]byte
                binary.BigEndian.PutUint32(blockHeight[:], e.BlockHeight)

                if _, err := w.Write(blockHeight[1:]); err != nil {
                        return err
                }

                // Check that field fit in 3 bytes and write the txIndex
                if e.TxIndex > ((1 << 24) - 1) {
                        return errors.New("tx index should fit in 3 bytes")
                }

                var txIndex [4]byte
                binary.BigEndian.PutUint32(txIndex[:], e.TxIndex)
                if _, err := w.Write(txIndex[1:]); err != nil {
                        return err
                }

                // Write the txPosition
                var txPosition [2]byte
                binary.BigEndian.PutUint16(txPosition[:], e.TxPosition)
                if _, err := w.Write(txPosition[:]); err != nil {
                        return err
                }

        case *net.TCPAddr:
                if e == nil {
                        return fmt.Errorf("cannot write nil TCPAddr")
                }

                if e.IP.To4() != nil {
                        var descriptor [1]byte
                        descriptor[0] = uint8(tcp4Addr)
                        if _, err := w.Write(descriptor[:]); err != nil {
                                return err
                        }

                        var ip [4]byte
                        copy(ip[:], e.IP.To4())
                        if _, err := w.Write(ip[:]); err != nil {
                                return err
                        }
                } else {
                        var descriptor [1]byte
                        descriptor[0] = uint8(tcp6Addr)
                        if _, err := w.Write(descriptor[:]); err != nil {
                                return err
                        }
                        var ip [16]byte
                        copy(ip[:], e.IP.To16())
                        if _, err := w.Write(ip[:]); err != nil {
                                return err
                        }
                }
                var port [2]byte
                binary.BigEndian.PutUint16(port[:], uint16(e.Port))
                if _, err := w.Write(port[:]); err != nil {
                        return err
                }

        case *tor.OnionAddr:
                if e == nil {
                        return errors.New("cannot write nil onion address")
                }

                var suffixIndex int
                switch len(e.OnionService) {
                case tor.V2Len:
                        descriptor := []byte{byte(v2OnionAddr)}
                        if _, err := w.Write(descriptor); err != nil {
                                return err
                        }
                        suffixIndex = tor.V2Len - tor.OnionSuffixLen
                case tor.V3Len:
                        descriptor := []byte{byte(v3OnionAddr)}
                        if _, err := w.Write(descriptor); err != nil {
                                return err
                        }
                        suffixIndex = tor.V3Len - tor.OnionSuffixLen
                default:
                        return errors.New("unknown onion service length")
                }

                host, err := tor.Base32Encoding.DecodeString(
                        e.OnionService[:suffixIndex],
                )
                if err != nil {
                        return err
                }
                if _, err := w.Write(host); err != nil {
                        return err
                }

                var port [2]byte
                binary.BigEndian.PutUint16(port[:], uint16(e.Port))
                if _, err := w.Write(port[:]); err != nil {
                        return err
                }

        case []net.Addr:
                // First, we'll encode all the addresses into an intermediate
                // buffer. We need to do this in order to compute the total
                // length of the addresses.
                var addrBuf bytes.Buffer
                for _, address := range e {
                        if err := WriteElement(&addrBuf, address); err != nil {
                                return err
                        }
                }

                // With the addresses fully encoded, we can now write out the
                // number of bytes needed to encode them.
                addrLen := addrBuf.Len()
                if err := WriteElement(w, uint16(addrLen)); err != nil {
                        return err
                }

                // Finally, we'll write out the raw addresses themselves, but
                // only if we have any bytes to write.
                if addrLen > 0 {
                        if _, err := w.Write(addrBuf.Bytes()); err != nil {
                                return err
                        }
                }

        case color.RGBA:
                if err := WriteElements(w, e.R, e.G, e.B); err != nil {
                        return err
                }

        case DeliveryAddress:
                var length [2]byte
                binary.BigEndian.PutUint16(length[:], uint16(len(e)))
                if _, err := w.Write(length[:]); err != nil {
                        return err
                }
                if _, err := w.Write(e[:]); err != nil {
                        return err
                }

        case bool:
                var b [1]byte
                if e {
                        b[0] = 1
                }
                if _, err := w.Write(b[:]); err != nil {
                        return err
                }

        case ExtraOpaqueData:
                return e.Encode(w)

        default:
                return fmt.Errorf("unknown type in WriteElement: %T", e)
        }

        return nil
}

// WriteElements is writes each element in the elements slice to the passed
// buffer using WriteElement.
//
// TODO(yy): rm this method once we finish dereferencing it from other
// packages.
func WriteElements(buf *bytes.Buffer, elements ...interface{}) error {
        for _, element := range elements {
                err := WriteElement(buf, element)
                if err != nil {
                        return err
                }
        }
        return nil
}

// ReadElement is a one-stop utility function to deserialize any datastructure
// encoded using the serialization format of lnwire.
func ReadElement(r io.Reader, element interface{}) error {
        var err error
        switch e := element.(type) {
        case *bool:
                var b [1]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }

                if b[0] == 1 {
                        *e = true
                }

        case *NodeAlias:
                var a [32]byte
                if _, err := io.ReadFull(r, a[:]); err != nil {
                        return err
                }

                alias, err := NewNodeAlias(string(a[:]))
                if err != nil {
                        return err
                }
                *e = alias

        case *QueryEncoding:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = QueryEncoding(b[0])

        case *uint8:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = b[0]

        case *FundingFlag:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = FundingFlag(b[0])

        case *uint16:
                var b [2]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = binary.BigEndian.Uint16(b[:])

        case *ChanUpdateMsgFlags:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = ChanUpdateMsgFlags(b[0])

        case *ChanUpdateChanFlags:
                var b [1]uint8
                if _, err := r.Read(b[:]); err != nil {
                        return err
                }
                *e = ChanUpdateChanFlags(b[0])

        case *uint32:
                var b [4]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = binary.BigEndian.Uint32(b[:])

        case *uint64:
                var b [8]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = binary.BigEndian.Uint64(b[:])

        case *MilliSatoshi:
                var b [8]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = MilliSatoshi(int64(binary.BigEndian.Uint64(b[:])))

        case *btcutil.Amount:
                var b [8]byte
                if _, err := io.ReadFull(r, b[:]); err != nil {
                        return err
                }
                *e = btcutil.Amount(int64(binary.BigEndian.Uint64(b[:])))

        case **btcec.PublicKey:
                var b [btcec.PubKeyBytesLenCompressed]byte
                if _, err = io.ReadFull(r, b[:]); err != nil {
                        return err
                }

                pubKey, err := btcec.ParsePubKey(b[:])
                if err != nil {
                        return err
                }
                *e = pubKey

        case *RawFeatureVector:
                f := NewRawFeatureVector()
                err = f.Decode(r)
                if err != nil {
                        return err
                }
                *e = *f

        case **RawFeatureVector:
                f := NewRawFeatureVector()
                err = f.Decode(r)
                if err != nil {
                        return err
                }
                *e = f

        case *[]Sig:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                numSigs := binary.BigEndian.Uint16(l[:])

                var sigs []Sig
                if numSigs > 0 {
                        sigs = make([]Sig, numSigs)
                        for i := 0; i < int(numSigs); i++ {
                                if err := ReadElement(r, &sigs[i]); err != nil {
                                        return err
                                }
                        }
                }
                *e = sigs

        case *Sig:
                if _, err := io.ReadFull(r, e.bytes[:]); err != nil {
                        return err
                }

        case *OpaqueReason:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                reasonLen := binary.BigEndian.Uint16(l[:])

                *e = OpaqueReason(make([]byte, reasonLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *WarningData:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                errorLen := binary.BigEndian.Uint16(l[:])

                *e = WarningData(make([]byte, errorLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *ErrorData:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                errorLen := binary.BigEndian.Uint16(l[:])

                *e = ErrorData(make([]byte, errorLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *PingPayload:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                pingLen := binary.BigEndian.Uint16(l[:])

                *e = PingPayload(make([]byte, pingLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *PongPayload:
                var l [2]byte
                if _, err := io.ReadFull(r, l[:]); err != nil {
                        return err
                }
                pongLen := binary.BigEndian.Uint16(l[:])

                *e = PongPayload(make([]byte, pongLen))
                if _, err := io.ReadFull(r, *e); err != nil {
                        return err
                }

        case *[33]byte:
                if _, err := io.ReadFull(r, e[:]); err != nil {
                        return err
                }

        case []byte:
                if _, err := io.ReadFull(r, e); err != nil {
                        return err
                }

        case *PkScript:
                pkScript, err := wire.ReadVarBytes(r, 0, 34, "pkscript")
                if err != nil {
                        return err
                }
                *e = pkScript

        case *wire.OutPoint:
                var h [32]byte
                if _, err = io.ReadFull(r, h[:]); err != nil {
                        return err
                }
                hash, err := chainhash.NewHash(h[:])
                if err != nil {
                        return err
                }

                var idxBytes [2]byte
                _, err = io.ReadFull(r, idxBytes[:])
                if err != nil {
                        return err
                }
                index := binary.BigEndian.Uint16(idxBytes[:])

                *e = wire.OutPoint{
                        Hash:  *hash,
                        Index: uint32(index),
                }

        case *FailCode:
                if err := ReadElement(r, (*uint16)(e)); err != nil {
                        return err
                }

        case *ChannelID:
                if _, err := io.ReadFull(r, e[:]); err != nil {
                        return err
                }

        case *ShortChannelID:
                var blockHeight [4]byte
                if _, err = io.ReadFull(r, blockHeight[1:]); err != nil {
                        return err
                }

                var txIndex [4]byte
                if _, err = io.ReadFull(r, txIndex[1:]); err != nil {
                        return err
                }

                var txPosition [2]byte
                if _, err = io.ReadFull(r, txPosition[:]); err != nil {
                        return err
                }

                *e = ShortChannelID{
                        BlockHeight: binary.BigEndian.Uint32(blockHeight[:]),
                        TxIndex:     binary.BigEndian.Uint32(txIndex[:]),
                        TxPosition:  binary.BigEndian.Uint16(txPosition[:]),
                }

        case *[]net.Addr:
                // First, we'll read the number of total bytes that have been
                // used to encode the set of addresses.
                var numAddrsBytes [2]byte
                if _, err = io.ReadFull(r, numAddrsBytes[:]); err != nil {
                        return err
                }
                addrsLen := binary.BigEndian.Uint16(numAddrsBytes[:])

                // With the number of addresses, read, we'll now pull in the
                // buffer of the encoded addresses into memory.
                addrs := make([]byte, addrsLen)
                if _, err := io.ReadFull(r, addrs[:]); err != nil {
                        return err
                }
                addrBuf := bytes.NewReader(addrs)

                // Finally, we'll parse the remaining address payload in
                // series, using the first byte to denote how to decode the
                // address itself.
                var (
                        addresses     []net.Addr
                        addrBytesRead uint16
                )

                for addrBytesRead < addrsLen {
                        var descriptor [1]byte
                        if _, err = io.ReadFull(addrBuf, descriptor[:]); err != nil {
                                return err
                        }

                        addrBytesRead++

                        var address net.Addr
                        switch aType := addressType(descriptor[0]); aType {
                        case noAddr:
                                addrBytesRead += aType.AddrLen()
                                continue

                        case tcp4Addr:
                                var ip [4]byte
                                if _, err := io.ReadFull(addrBuf, ip[:]); err != nil {
                                        return err
                                }

                                var port [2]byte
                                if _, err := io.ReadFull(addrBuf, port[:]); err != nil {
                                        return err
                                }

                                address = &net.TCPAddr{
                                        IP:   net.IP(ip[:]),
                                        Port: int(binary.BigEndian.Uint16(port[:])),
                                }
                                addrBytesRead += aType.AddrLen()

                        case tcp6Addr:
                                var ip [16]byte
                                if _, err := io.ReadFull(addrBuf, ip[:]); err != nil {
                                        return err
                                }

                                var port [2]byte
                                if _, err := io.ReadFull(addrBuf, port[:]); err != nil {
                                        return err
                                }

                                address = &net.TCPAddr{
                                        IP:   net.IP(ip[:]),
                                        Port: int(binary.BigEndian.Uint16(port[:])),
                                }
                                addrBytesRead += aType.AddrLen()

                        case v2OnionAddr:
                                var h [tor.V2DecodedLen]byte
                                if _, err := io.ReadFull(addrBuf, h[:]); err != nil {
                                        return err
                                }

                                var p [2]byte
                                if _, err := io.ReadFull(addrBuf, p[:]); err != nil {
                                        return err
                                }

                                onionService := tor.Base32Encoding.EncodeToString(h[:])
                                onionService += tor.OnionSuffix
                                port := int(binary.BigEndian.Uint16(p[:]))

                                address = &tor.OnionAddr{
                                        OnionService: onionService,
                                        Port:         port,
                                }
                                addrBytesRead += aType.AddrLen()

                        case v3OnionAddr:
                                var h [tor.V3DecodedLen]byte
                                if _, err := io.ReadFull(addrBuf, h[:]); err != nil {
                                        return err
                                }

                                var p [2]byte
                                if _, err := io.ReadFull(addrBuf, p[:]); err != nil {
                                        return err
                                }

                                onionService := tor.Base32Encoding.EncodeToString(h[:])
                                onionService += tor.OnionSuffix
                                port := int(binary.BigEndian.Uint16(p[:]))

                                address = &tor.OnionAddr{
                                        OnionService: onionService,
                                        Port:         port,
                                }
                                addrBytesRead += aType.AddrLen()

                        default:
                                // If we don't understand this address type,
                                // we just store it along with the remaining
                                // address bytes as type OpaqueAddrs. We need
                                // to hold onto the bytes so that we can still
                                // write them back to the wire when we
                                // propagate this message.
                                payloadLen := 1 + addrsLen - addrBytesRead
                                payload := make([]byte, payloadLen)

                                // First write a byte for the address type that
                                // we already read.
                                payload[0] = byte(aType)

                                // Now append the rest of the address bytes.
                                _, err := io.ReadFull(addrBuf, payload[1:])
                                if err != nil {
                                        return err
                                }

                                address = &OpaqueAddrs{
                                        Payload: payload,
                                }
                                addrBytesRead = addrsLen
                        }

                        addresses = append(addresses, address)
                }

                *e = addresses

        case *color.RGBA:
                err := ReadElements(r,
                        &e.R,
                        &e.G,
                        &e.B,
                )
                if err != nil {
                        return err
                }

        case *DeliveryAddress:
                var addrLen [2]byte
                if _, err = io.ReadFull(r, addrLen[:]); err != nil {
                        return err
                }
                length := binary.BigEndian.Uint16(addrLen[:])

                var addrBytes [deliveryAddressMaxSize]byte

                if length > deliveryAddressMaxSize {
                        return fmt.Errorf(
                                "cannot read %d bytes into addrBytes", length,
                        )
                }
                if _, err = io.ReadFull(r, addrBytes[:length]); err != nil {
                        return err
                }
                *e = addrBytes[:length]

        case *PartialSig:
                var sig PartialSig
                if err = sig.Decode(r); err != nil {
                        return err
                }
                *e = sig

        case *ExtraOpaqueData:
                return e.Decode(r)

        default:
                return fmt.Errorf("unknown type in ReadElement: %T", e)
        }

        return nil
}

// ReadElements deserializes a variable number of elements into the passed
// io.Reader, with each element being deserialized according to the ReadElement
// function.
func ReadElements(r io.Reader, elements ...interface{}) error {
        for _, element := range elements {
                err := ReadElement(r, element)
                if err != nil {
                        return err
                }
        }
        return nil
}

lightningnetwork / lnd / 13211764208

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