93 lines
2.7 KiB
Go
93 lines
2.7 KiB
Go
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package sctp
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import (
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"encoding/binary"
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"errors"
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"fmt"
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)
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// errorCauseCode is a cause code that appears in either a ERROR or ABORT chunk
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type errorCauseCode uint16
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type errorCause interface {
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unmarshal([]byte) error
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marshal() ([]byte, error)
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length() uint16
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String() string
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errorCauseCode() errorCauseCode
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}
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var errBuildErrorCaseHandle = errors.New("BuildErrorCause does not handle")
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// buildErrorCause delegates the building of a error cause from raw bytes to the correct structure
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func buildErrorCause(raw []byte) (errorCause, error) {
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var e errorCause
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c := errorCauseCode(binary.BigEndian.Uint16(raw[0:]))
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switch c {
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case invalidMandatoryParameter:
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e = &errorCauseInvalidMandatoryParameter{}
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case unrecognizedChunkType:
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e = &errorCauseUnrecognizedChunkType{}
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case protocolViolation:
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e = &errorCauseProtocolViolation{}
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default:
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return nil, fmt.Errorf("%w: %s", errBuildErrorCaseHandle, c.String())
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}
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if err := e.unmarshal(raw); err != nil {
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return nil, err
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}
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return e, nil
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}
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const (
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invalidStreamIdentifier errorCauseCode = 1
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missingMandatoryParameter errorCauseCode = 2
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staleCookieError errorCauseCode = 3
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outOfResource errorCauseCode = 4
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unresolvableAddress errorCauseCode = 5
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unrecognizedChunkType errorCauseCode = 6
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invalidMandatoryParameter errorCauseCode = 7
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unrecognizedParameters errorCauseCode = 8
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noUserData errorCauseCode = 9
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cookieReceivedWhileShuttingDown errorCauseCode = 10
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restartOfAnAssociationWithNewAddresses errorCauseCode = 11
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userInitiatedAbort errorCauseCode = 12
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protocolViolation errorCauseCode = 13
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)
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func (e errorCauseCode) String() string {
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switch e {
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case invalidStreamIdentifier:
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return "Invalid Stream Identifier"
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case missingMandatoryParameter:
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return "Missing Mandatory Parameter"
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case staleCookieError:
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return "Stale Cookie Error"
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case outOfResource:
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return "Out Of Resource"
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case unresolvableAddress:
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return "Unresolvable IP"
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case unrecognizedChunkType:
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return "Unrecognized Chunk Type"
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case invalidMandatoryParameter:
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return "Invalid Mandatory Parameter"
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case unrecognizedParameters:
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return "Unrecognized Parameters"
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case noUserData:
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return "No User Data"
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case cookieReceivedWhileShuttingDown:
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return "Cookie Received While Shutting Down"
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case restartOfAnAssociationWithNewAddresses:
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return "Restart Of An Association With New Addresses"
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case userInitiatedAbort:
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return "User Initiated Abort"
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case protocolViolation:
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return "Protocol Violation"
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default:
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return fmt.Sprintf("Unknown CauseCode: %d", e)
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}
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}
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