AdGuardHome/internal/aghnet/arpdb_windows.go

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//go:build windows
// +build windows
package aghnet
import (
"bufio"
"io"
"net"
"strings"
"sync"
)
func newARPDB() *cmdARPDB {
return &cmdARPDB{
runcmd: rcArpA,
ns: &neighs{
mu: &sync.RWMutex{},
ns: make([]Neighbor, 0),
},
parse: parseArpA,
}
}
// rcArpA runs "arp /a".
func rcArpA() (r io.Reader, err error) {
return runCmd("arp", "/a")
}
// parseArpA parses the output of the "arp /a" command on Windows. The expected
// input format (the first line is empty):
//
//
// Interface: 192.168.56.16 --- 0x7
// Internet Address Physical Address Type
// 192.168.56.1 0a-00-27-00-00-00 dynamic
// 192.168.56.255 ff-ff-ff-ff-ff-ff static
//
func parseArpA(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
ns = make([]Neighbor, 0, lenHint)
for sc.Scan() {
ln := sc.Text()
if ln == "" {
continue
}
fields := strings.Fields(ln)
if len(fields) != 3 {
continue
}
n := Neighbor{}
if ip := net.ParseIP(fields[0]); ip == nil {
continue
} else {
n.IP = ip
}
if mac, err := net.ParseMAC(fields[1]); err != nil {
continue
} else {
n.MAC = mac
}
ns = append(ns, n)
}
return ns
}