只是一个简单的计网课设
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eruhs/core/parser/icmp.go

33 lines
687 B

package parser
import (
"encoding/binary"
"errors"
)
type ICMP struct {
BaseLayer
TypeCode uint16
Checksum uint16
Id uint16
Seq uint16
}
func (I *ICMP) LayerType() int {
return LayerTypeICMP
}
func DecodeICMP(data []byte) (*ICMP, error) {
icmp := ICMP{}
if len(data) < 8 {
return nil, errors.New("ICMP数据包头部少于8字节")
}
icmp.TypeCode = binary.BigEndian.Uint16(data[0:2])
icmp.Checksum = binary.BigEndian.Uint16(data[2:4])
icmp.Id = binary.BigEndian.Uint16(data[4:6])
icmp.Seq = binary.BigEndian.Uint16(data[6:8])
icmp.BaseLayer = BaseLayer{data[:8], data[8:]}
return &icmp, nil
}