all: sync with master; upd chlog

internal/arpdb/arpdb_openbsd.go

@@ -0,0 +1,76 @@
+//go:build openbsd
+
+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",
+		// Use -n flag to avoid resolving the hostnames of the neighbors.  By
+		// default ARP attempts to resolve the hostnames via DNS.  See man 8
+		// arp.
+		//
+		// See also https://github.com/AdguardTeam/AdGuardHome/issues/3157.
+		args: []string{"-a", "-n"},
+	}
+}
+
+// parseArpA parses the output of the "arp -a -n" command on OpenBSD.  The
+// expected input format:
+//
+//	Host        Ethernet Address  Netif Expire    Flags
+//	192.168.1.1 ab:cd:ef:ab:cd:ef   em0 19m59s
+func parseArpA(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
+	// Skip the header.
+	if !sc.Scan() {
+		return nil
+	}
+
+	ns = make([]Neighbor, 0, lenHint)
+	for sc.Scan() {
+		ln := sc.Text()
+
+		fields := strings.Fields(ln)
+		if len(fields) < 2 {
+			continue
+		}
+
+		n := Neighbor{}
+
+		ip, err := netip.ParseAddr(fields[0])
+		if err != nil {
+			log.Debug("arpdb: parsing arp output: ip: %s", err)
+
+			continue
+		} else {
+			n.IP = ip
+		}
+
+		mac, err := net.ParseMAC(fields[1])
+		if err != nil {
+			log.Debug("arpdb: parsing arp output: mac: %s", err)
+
+			continue
+		} else {
+			n.MAC = mac
+		}
+
+		ns = append(ns, n)
+	}
+
+	return ns
+}