all: sync with master; upd chlog

internal/arpdb/arpdb_windows.go

@@ -0,0 +1,68 @@
+//go:build windows
+
+package arpdb
+
+import (
+	"bufio"
+	"net"
+	"net/netip"
+	"strings"
+	"sync"
+
+	"github.com/AdguardTeam/golibs/log"
+)
+
+func newARPDB() (arp *cmdARPDB) {
+	return &cmdARPDB{
+		parse: parseArpA,
+		ns: &neighs{
+			mu: &sync.RWMutex{},
+			ns: make([]Neighbor, 0),
+		},
+		cmd:  "arp",
+		args: []string{"/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
+		}
+
+		ip, err := netip.ParseAddr(fields[0])
+		if err != nil {
+			log.Debug("arpdb: parsing arp output: ip: %s", err)
+
+			continue
+		}
+
+		mac, err := net.ParseMAC(fields[1])
+		if err != nil {
+			log.Debug("arpdb: parsing arp output: mac: %s", err)
+
+			continue
+		}
+
+		ns = append(ns, Neighbor{
+			IP:  ip,
+			MAC: mac,
+		})
+	}
+
+	return ns
+}