forked from scionproto/scion
/
util.go
77 lines (72 loc) · 2.32 KB
/
util.go
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// Copyright 2016 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package scmp
import (
"github.com/scionproto/scion/go/lib/common"
)
var (
quoteBasic = []RawBlock{RawCmnHdr, RawAddrHdr, RawL4Hdr}
quoteAll = append(quoteBasic, RawPathHdr, RawExtHdrs)
quotePath = append(quoteBasic, RawPathHdr)
quoteExts = append(quoteBasic, RawExtHdrs)
)
func classTypeQuotes(ct ClassType) []RawBlock {
switch {
case ct == ClassType{C_General, T_G_Unspecified}:
return quoteAll
case ct.Class == C_Routing || ct.Class == C_CmnHdr:
return quoteBasic
case ct == ClassType{C_Path, T_P_PathRequired}:
return quoteBasic
case ct.Class == C_Path:
return quotePath
case ct.Class == C_Ext:
return quoteExts
default:
return nil
}
}
func ParseInfo(b common.RawBytes, ct ClassType) (Info, error) {
switch {
case ct == ClassType{C_General, T_G_Unspecified}:
return InfoString(b), nil
case ct == ClassType{C_General, T_G_EchoRequest}:
fallthrough
case ct == ClassType{C_General, T_G_EchoReply}:
return InfoEchoFromRaw(b)
case ct == ClassType{C_General, T_G_TraceRouteRequest}:
fallthrough
case ct == ClassType{C_General, T_G_TraceRouteReply}:
return InfoTraceRouteFromRaw(b)
case ct == ClassType{C_General, T_G_RecordPathRequest}:
fallthrough
case ct == ClassType{C_General, T_G_RecordPathReply}:
return InfoRecordPathFromRaw(b)
case ct == ClassType{C_Routing, T_R_OversizePkt}:
fallthrough
case ct == ClassType{C_CmnHdr, T_C_BadPktLen}:
return InfoPktSizeFromRaw(b)
case ct == ClassType{C_Path, T_P_PathRequired}:
return nil, nil
case ct == ClassType{C_Path, T_P_RevokedIF}:
return InfoRevocationFromRaw(b)
case ct.Class == C_Path:
return InfoPathOffsetsFromRaw(b)
case ct.Class == C_Ext:
return InfoExtIdxFromRaw(b)
case ct.Class == C_Sibra:
// TODO(kormat): not defined/handled yet.
}
return nil, nil
}