feat: Waku v2 bridge

Issue #12610

vendor/github.com/pion/sctp/chunk_heartbeat_ack.go

@@ -0,0 +1,93 @@
+package sctp
+
+import (
+	"errors"
+	"fmt"
+)
+
+/*
+chunkHeartbeatAck represents an SCTP Chunk of type HEARTBEAT ACK
+
+An endpoint should send this chunk to its peer endpoint as a response
+to a HEARTBEAT chunk (see Section 8.3).  A HEARTBEAT ACK is always
+sent to the source IP address of the IP datagram containing the
+HEARTBEAT chunk to which this ack is responding.
+
+The parameter field contains a variable-length opaque data structure.
+
+ 0                   1                   2                   3
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|   Type = 5    | Chunk  Flags  |    Heartbeat Ack Length       |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                                                               |
+|            Heartbeat Information TLV (Variable-Length)        |
+|                                                               |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+Defined as a variable-length parameter using the format described
+in Section 3.2.1, i.e.:
+
+Variable Parameters                  Status     Type Value
+-------------------------------------------------------------
+Heartbeat Info                       Mandatory   1
+*/
+type chunkHeartbeatAck struct {
+	chunkHeader
+	params []param
+}
+
+var (
+	errUnimplemented                = errors.New("unimplemented")
+	errHeartbeatAckParams           = errors.New("heartbeat Ack must have one param")
+	errHeartbeatAckNotHeartbeatInfo = errors.New("heartbeat Ack must have one param, and it should be a HeartbeatInfo")
+	errHeartbeatAckMarshalParam     = errors.New("unable to marshal parameter for Heartbeat Ack")
+)
+
+func (h *chunkHeartbeatAck) unmarshal(raw []byte) error {
+	return errUnimplemented
+}
+
+func (h *chunkHeartbeatAck) marshal() ([]byte, error) {
+	if len(h.params) != 1 {
+		return nil, errHeartbeatAckParams
+	}
+
+	switch h.params[0].(type) {
+	case *paramHeartbeatInfo:
+		// ParamHeartbeatInfo is valid
+	default:
+		return nil, errHeartbeatAckNotHeartbeatInfo
+	}
+
+	out := make([]byte, 0)
+	for idx, p := range h.params {
+		pp, err := p.marshal()
+		if err != nil {
+			return nil, fmt.Errorf("%w: %v", errHeartbeatAckMarshalParam, err)
+		}
+
+		out = append(out, pp...)
+
+		// Chunks (including Type, Length, and Value fields) are padded out
+		// by the sender with all zero bytes to be a multiple of 4 bytes
+		// long.  This padding MUST NOT be more than 3 bytes in total.  The
+		// Chunk Length value does not include terminating padding of the
+		// chunk.  *However, it does include padding of any variable-length
+		// parameter except the last parameter in the chunk.*  The receiver
+		// MUST ignore the padding.
+		if idx != len(h.params)-1 {
+			out = padByte(out, getPadding(len(pp)))
+		}
+	}
+
+	h.chunkHeader.typ = ctHeartbeatAck
+	h.chunkHeader.raw = out
+
+	return h.chunkHeader.marshal()
+}
+
+func (h *chunkHeartbeatAck) check() (abort bool, err error) {
+	return false, nil
+}