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server/vendor/github.com/pion/sctp/chunk_heartbeat.go

@@ -0,0 +1,86 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp
+
+import (
+	"errors"
+	"fmt"
+)
+
+/*
+chunkHeartbeat represents an SCTP Chunk of type HEARTBEAT
+
+An endpoint should send this chunk to its peer endpoint to probe the
+reachability of a particular destination transport address defined in
+the present association.
+
+The parameter field contains the Heartbeat Information, which is a
+variable-length opaque data structure understood only by the sender.
+
+	 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 = 4    | Chunk  Flags  |      Heartbeat 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 chunkHeartbeat struct {
+	chunkHeader
+	params []param
+}
+
+// Heartbeat chunk errors
+var (
+	ErrChunkTypeNotHeartbeat      = errors.New("ChunkType is not of type HEARTBEAT")
+	ErrHeartbeatNotLongEnoughInfo = errors.New("heartbeat is not long enough to contain Heartbeat Info")
+	ErrParseParamTypeFailed       = errors.New("failed to parse param type")
+	ErrHeartbeatParam             = errors.New("heartbeat should only have HEARTBEAT param")
+	ErrHeartbeatChunkUnmarshal    = errors.New("failed unmarshalling param in Heartbeat Chunk")
+)
+
+func (h *chunkHeartbeat) unmarshal(raw []byte) error {
+	if err := h.chunkHeader.unmarshal(raw); err != nil {
+		return err
+	} else if h.typ != ctHeartbeat {
+		return fmt.Errorf("%w: actually is %s", ErrChunkTypeNotHeartbeat, h.typ.String())
+	}
+
+	if len(raw) <= chunkHeaderSize {
+		return fmt.Errorf("%w: %d", ErrHeartbeatNotLongEnoughInfo, len(raw))
+	}
+
+	pType, err := parseParamType(raw[chunkHeaderSize:])
+	if err != nil {
+		return fmt.Errorf("%w: %v", ErrParseParamTypeFailed, err) //nolint:errorlint
+	}
+	if pType != heartbeatInfo {
+		return fmt.Errorf("%w: instead have %s", ErrHeartbeatParam, pType.String())
+	}
+
+	p, err := buildParam(pType, raw[chunkHeaderSize:])
+	if err != nil {
+		return fmt.Errorf("%w: %v", ErrHeartbeatChunkUnmarshal, err) //nolint:errorlint
+	}
+	h.params = append(h.params, p)
+
+	return nil
+}
+
+func (h *chunkHeartbeat) Marshal() ([]byte, error) {
+	return nil, ErrUnimplemented
+}
+
+func (h *chunkHeartbeat) check() (abort bool, err error) {
+	return false, nil
+}