104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
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// SPDX-License-Identifier: MIT
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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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Operation Error (ERROR) (9)
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An endpoint sends this chunk to its peer endpoint to notify it of
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certain error conditions. It contains one or more error causes. An
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Operation Error is not considered fatal in and of itself, but may be
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used with an ERROR chunk to report a fatal condition. It has the
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following parameters:
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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 = 9 | Chunk Flags | Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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\ \
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/ one or more Error Causes /
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\ \
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Chunk Flags: 8 bits
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Set to 0 on transmit and ignored on receipt.
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Length: 16 bits (unsigned integer)
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Set to the size of the chunk in bytes, including the chunk header
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and all the Error Cause fields present.
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*/
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type chunkError struct {
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chunkHeader
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errorCauses []errorCause
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}
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// Error chunk errors
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var (
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ErrChunkTypeNotCtError = errors.New("ChunkType is not of type ctError")
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ErrBuildErrorChunkFailed = errors.New("failed build Error Chunk")
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)
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func (a *chunkError) 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 != ctError {
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return fmt.Errorf("%w, actually is %s", ErrChunkTypeNotCtError, 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", ErrBuildErrorChunkFailed, err) //nolint:errorlint
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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 *chunkError) marshal() ([]byte, error) {
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a.chunkHeader.typ = ctError
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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 *chunkError) check() (abort bool, err error) {
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return false, nil
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}
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// String makes chunkError printable
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func (a *chunkError) 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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