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package arping
import (
"net"
"syscall"
"time"
)
var sock int
var toSockaddr syscall.SockaddrLinklayer
func initialize(iface net.Interface) error {
toSockaddr = syscall.SockaddrLinklayer{Ifindex: iface.Index}
// 1544 = htons(ETH_P_ARP)
const proto = 1544
var err error
sock, err = syscall.Socket(syscall.AF_PACKET, syscall.SOCK_RAW, proto)
return err
}
func send(request arpDatagram) (time.Time, error) {
return time.Now(), syscall.Sendto(sock, request.MarshalWithEthernetHeader(), 0, &toSockaddr)
}
func receive() (arpDatagram, time.Time, error) {
buffer := make([]byte, 128)
n, _, err := syscall.Recvfrom(sock, buffer, 0)
if err != nil {
return arpDatagram{}, time.Now(), err
}
// skip 14 bytes ethernet header
return parseArpDatagram(buffer[14:n]), time.Now(), nil
}
func deinitialize() error {
return syscall.Close(sock)
}
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