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

@@ -0,0 +1,96 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp // nolint:dupl
+
+import (
+	"errors"
+	"fmt"
+)
+
+/*
+Abort represents an SCTP Chunk of type ABORT
+
+The ABORT chunk is sent to the peer of an association to close the
+association.  The ABORT chunk may contain Cause Parameters to inform
+the receiver about the reason of the abort.  DATA chunks MUST NOT be
+bundled with ABORT.  Control chunks (except for INIT, INIT ACK, and
+SHUTDOWN COMPLETE) MAY be bundled with an ABORT, but they MUST be
+placed before the ABORT in the SCTP packet or they will be ignored by
+the receiver.
+
+	 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 = 6    |Reserved     |T|           Length              |
+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	|                                                               |
+	|                   zero or more Error Causes                   |
+	|                                                               |
+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+type chunkAbort struct {
+	chunkHeader
+	errorCauses []errorCause
+}
+
+// Abort chunk errors
+var (
+	ErrChunkTypeNotAbort     = errors.New("ChunkType is not of type ABORT")
+	ErrBuildAbortChunkFailed = errors.New("failed build Abort Chunk")
+)
+
+func (a *chunkAbort) unmarshal(raw []byte) error {
+	if err := a.chunkHeader.unmarshal(raw); err != nil {
+		return err
+	}
+
+	if a.typ != ctAbort {
+		return fmt.Errorf("%w: actually is %s", ErrChunkTypeNotAbort, a.typ.String())
+	}
+
+	offset := chunkHeaderSize
+	for {
+		if len(raw)-offset < 4 {
+			break
+		}
+
+		e, err := buildErrorCause(raw[offset:])
+		if err != nil {
+			return fmt.Errorf("%w: %v", ErrBuildAbortChunkFailed, err) //nolint:errorlint
+		}
+
+		offset += int(e.length())
+		a.errorCauses = append(a.errorCauses, e)
+	}
+	return nil
+}
+
+func (a *chunkAbort) marshal() ([]byte, error) {
+	a.chunkHeader.typ = ctAbort
+	a.flags = 0x00
+	a.raw = []byte{}
+	for _, ec := range a.errorCauses {
+		raw, err := ec.marshal()
+		if err != nil {
+			return nil, err
+		}
+		a.raw = append(a.raw, raw...)
+	}
+	return a.chunkHeader.marshal()
+}
+
+func (a *chunkAbort) check() (abort bool, err error) {
+	return false, nil
+}
+
+// String makes chunkAbort printable
+func (a *chunkAbort) String() string {
+	res := a.chunkHeader.String()
+
+	for _, cause := range a.errorCauses {
+		res += fmt.Sprintf("\n - %s", cause)
+	}
+
+	return res
+}