93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
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package sctp // nolint:dupl
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import (
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"errors"
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"fmt"
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)
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/*
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Abort represents an SCTP Chunk of type ABORT
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The ABORT chunk is sent to the peer of an association to close the
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association. The ABORT chunk may contain Cause Parameters to inform
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the receiver about the reason of the abort. DATA chunks MUST NOT be
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bundled with ABORT. Control chunks (except for INIT, INIT ACK, and
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SHUTDOWN COMPLETE) MAY be bundled with an ABORT, but they MUST be
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placed before the ABORT in the SCTP packet or they will be ignored by
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the receiver.
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type = 6 |Reserved |T| Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| zero or more Error Causes |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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type chunkAbort struct {
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chunkHeader
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errorCauses []errorCause
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}
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var (
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errChunkTypeNotAbort = errors.New("ChunkType is not of type ABORT")
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errBuildAbortChunkFailed = errors.New("failed build Abort Chunk")
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)
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func (a *chunkAbort) unmarshal(raw []byte) error {
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if err := a.chunkHeader.unmarshal(raw); err != nil {
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return err
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}
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if a.typ != ctAbort {
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return fmt.Errorf("%w: actually is %s", errChunkTypeNotAbort, a.typ.String())
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}
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offset := chunkHeaderSize
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for {
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if len(raw)-offset < 4 {
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break
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}
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e, err := buildErrorCause(raw[offset:])
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if err != nil {
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return fmt.Errorf("%w: %v", errBuildAbortChunkFailed, err)
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}
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offset += int(e.length())
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a.errorCauses = append(a.errorCauses, e)
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}
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return nil
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}
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func (a *chunkAbort) marshal() ([]byte, error) {
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a.chunkHeader.typ = ctAbort
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a.flags = 0x00
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a.raw = []byte{}
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for _, ec := range a.errorCauses {
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raw, err := ec.marshal()
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if err != nil {
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return nil, err
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}
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a.raw = append(a.raw, raw...)
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}
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return a.chunkHeader.marshal()
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}
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func (a *chunkAbort) check() (abort bool, err error) {
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return false, nil
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}
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// String makes chunkAbort printable
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func (a *chunkAbort) String() string {
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res := a.chunkHeader.String()
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for _, cause := range a.errorCauses {
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res += fmt.Sprintf("\n - %s", cause)
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}
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return res
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}
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