/
icmp.go
57 lines (46 loc) · 1.25 KB
/
icmp.go
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/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: FTwOoO <booobooob@gmail.com>
*/
package tcpip
import (
"encoding/binary"
)
type ICMPType byte
const (
ICMPEcho ICMPType = 0x0
ICMPRequest = 0x8
)
type ICMPPacket []byte
func (p ICMPPacket) Type() ICMPType {
return ICMPType(p[0])
}
func (p ICMPPacket) SetType(v ICMPType) {
p[0] = byte(v)
}
func (p ICMPPacket) Code() byte {
return p[1]
}
func (p ICMPPacket) Checksum() uint16 {
return binary.BigEndian.Uint16(p[2:])
}
func (p ICMPPacket) SetChecksum(sum [2]byte) {
p[2] = sum[0]
p[3] = sum[1]
}
func (p ICMPPacket) ResetChecksum() {
p.SetChecksum(zeroChecksum)
p.SetChecksum(Checksum(0, p))
}