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