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c4a13b92d2
Merge in DNS/adguard-home from 3157-excessive-ptrs to master Updates #3157. Squashed commit of the following: commit 6803988240dca2f147bb80a5b3f78d7749d2fa14 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Tue Apr 19 14:50:01 2022 +0300 aghnet: and again commit 1a7f4d1dbc8fd4d3ae620349917526a75fa71b47 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Tue Apr 19 14:49:20 2022 +0300 aghnet: docs again commit d88da1fc7135f3cd03aff10b02d9957c8ffdfd30 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Tue Apr 19 14:47:36 2022 +0300 aghnet: imp docs commit c45dbc7800e882c6c4110aab640c32b03046f89a Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Tue Apr 19 14:41:19 2022 +0300 aghnet: keep alphabetical order commit b61781785d096ef43f60fb4f1905a4ed3cdf7c68 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Tue Apr 19 13:50:56 2022 +0300 aghnet: imp code quality commit 578dbd71ed2f2089c69343d7d4bf8bbc29150ace Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Tue Apr 12 17:02:38 2022 +0300 aghnet: imp arp container
76 lines
1.5 KiB
Go
76 lines
1.5 KiB
Go
//go:build darwin || freebsd
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// +build darwin freebsd
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package aghnet
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import (
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"bufio"
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"net"
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"strings"
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"sync"
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"github.com/AdguardTeam/golibs/log"
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"github.com/AdguardTeam/golibs/netutil"
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)
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func newARPDB() (arp *cmdARPDB) {
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return &cmdARPDB{
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parse: parseArpA,
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ns: &neighs{
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mu: &sync.RWMutex{},
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ns: make([]Neighbor, 0),
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},
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cmd: "arp",
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// Use -n flag to avoid resolving the hostnames of the neighbors. By
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// default ARP attempts to resolve the hostnames via DNS. See man 8
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// arp.
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//
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// See also https://github.com/AdguardTeam/AdGuardHome/issues/3157.
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args: []string{"-a", "-n"},
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}
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}
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// parseArpA parses the output of the "arp -a -n" command on macOS and FreeBSD.
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// The expected input format:
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//
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// host.name (192.168.0.1) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]
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//
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func parseArpA(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
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ns = make([]Neighbor, 0, lenHint)
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for sc.Scan() {
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ln := sc.Text()
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fields := strings.Fields(ln)
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if len(fields) < 4 {
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continue
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}
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n := Neighbor{}
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if ipStr := fields[1]; len(ipStr) < 2 {
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continue
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} else if ip := net.ParseIP(ipStr[1 : len(ipStr)-1]); ip == nil {
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continue
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} else {
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n.IP = ip
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}
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hwStr := fields[3]
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if mac, err := net.ParseMAC(hwStr); err != nil {
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continue
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} else {
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n.MAC = mac
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}
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host := fields[0]
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if err := netutil.ValidateDomainName(host); err != nil {
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log.Debug("parsing arp output: %s", err)
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} else {
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n.Name = host
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}
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ns = append(ns, n)
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}
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return ns
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}
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