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cherry-pick: 3157 excessive ptrs

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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
This commit is contained in:
Eugene Burkov 2022-04-19 15:01:49 +03:00 committed by Ainar Garipov
parent 723279121a
commit c4a13b92d2
39 changed files with 2111 additions and 510 deletions
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10
CHANGELOG.md
View file

@ -34,10 +34,6 @@ and this project adheres to
### Changed
- Reverse DNS now has a greater priority as the source of runtime clients'
information than ARP neighborhood.
- Improved detection of runtime clients through more resilient ARP processing
([#3597]).
- The TTL of responses served from the optimistic cache is now lowered to 10
seconds.
- Domain-specific private reverse DNS upstream servers are now validated to
@ -114,7 +110,6 @@ In this release, the schema version has changed from 12 to 14.
[#3367]: https://github.com/AdguardTeam/AdGuardHome/issues/3367
[#3381]: https://github.com/AdguardTeam/AdGuardHome/issues/3381
[#3503]: https://github.com/AdguardTeam/AdGuardHome/issues/3503
[#3597]: https://github.com/AdguardTeam/AdGuardHome/issues/3597
[#4238]: https://github.com/AdguardTeam/AdGuardHome/issues/4238
[ddr-draft-06]: https://www.ietf.org/archive/id/draft-ietf-add-ddr-06.html
@ -150,6 +145,10 @@ See also the [v0.107.7 GitHub milestone][ms-v0.107.7].
### Changed
- Reverse DNS now has a greater priority as the source of runtime clients'
information than ARP neighborhood.
- Improved detection of runtime clients through more resilient ARP processing
([#3597]).
- On OpenBSD, the daemon script now uses the recommended `/bin/ksh` shell
instead of the `/bin/sh` one ([#4533]). To apply this change, backup your
data and run `AdGuardHome -s uninstall && AdGuardHome -s install`.
@ -169,6 +168,7 @@ See also the [v0.107.7 GitHub milestone][ms-v0.107.7].
[#1730]: https://github.com/AdguardTeam/AdGuardHome/issues/1730
[#3157]: https://github.com/AdguardTeam/AdGuardHome/issues/3157
[#3597]: https://github.com/AdguardTeam/AdGuardHome/issues/3597
[#3978]: https://github.com/AdguardTeam/AdGuardHome/issues/3978
[#4166]: https://github.com/AdguardTeam/AdGuardHome/issues/4166
[#4213]: https://github.com/AdguardTeam/AdGuardHome/issues/4213

211
internal/aghnet/arpdb.go Normal file
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@ -0,0 +1,211 @@
package aghnet
import (
"bufio"
"bytes"
"fmt"
"net"
"sync"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/netutil"
)
// ARPDB: The Network Neighborhood Database
// ARPDB stores and refreshes the network neighborhood reported by ARP (Address
// Resolution Protocol).
type ARPDB interface {
// Refresh updates the stored data. It must be safe for concurrent use.
Refresh() (err error)
// Neighbors returnes the last set of data reported by ARP. Both the method
// and it's result must be safe for concurrent use.
Neighbors() (ns []Neighbor)
}
// NewARPDB returns the ARPDB properly initialized for the OS.
func NewARPDB() (arp ARPDB) {
return newARPDB()
}
// Empty ARPDB implementation
// EmptyARPDB is the ARPDB implementation that does nothing.
type EmptyARPDB struct{}
// type check
var _ ARPDB = EmptyARPDB{}
// Refresh implements the ARPDB interface for EmptyARPContainer. It does
// nothing and always returns nil error.
func (EmptyARPDB) Refresh() (err error) { return nil }
// Neighbors implements the ARPDB interface for EmptyARPContainer. It always
// returns nil.
func (EmptyARPDB) Neighbors() (ns []Neighbor) { return nil }
// ARPDB Helper Types
// Neighbor is the pair of IP address and MAC address reported by ARP.
type Neighbor struct {
// Name is the hostname of the neighbor. Empty name is valid since not each
// implementation of ARP is able to retrieve that.
Name string
// IP contains either IPv4 or IPv6.
IP net.IP
// MAC contains the hardware address.
MAC net.HardwareAddr
}
// Clone returns the deep copy of n.
func (n Neighbor) Clone() (clone Neighbor) {
return Neighbor{
Name: n.Name,
IP: netutil.CloneIP(n.IP),
MAC: netutil.CloneMAC(n.MAC),
}
}
// neighs is the helper type that stores neighbors to avoid copying its methods
// among all the ARPDB implementations.
type neighs struct {
mu *sync.RWMutex
ns []Neighbor
}
// len returns the length of the neighbors slice. It's safe for concurrent use.
func (ns *neighs) len() (l int) {
ns.mu.RLock()
defer ns.mu.RUnlock()
return len(ns.ns)
}
// clone returns a deep copy of the underlying neighbors slice. It's safe for
// concurrent use.
func (ns *neighs) clone() (cloned []Neighbor) {
ns.mu.RLock()
defer ns.mu.RUnlock()
cloned = make([]Neighbor, len(ns.ns))
for i, n := range ns.ns {
cloned[i] = n.Clone()
}
return cloned
}
// reset replaces the underlying slice with the new one. It's safe for
// concurrent use.
func (ns *neighs) reset(with []Neighbor) {
ns.mu.Lock()
defer ns.mu.Unlock()
ns.ns = with
}
// Command ARPDB
// parseNeighsFunc parses the text from sc as if it'd be an output of some
// ARP-related command. lenHint is a hint for the size of the allocated slice
// of Neighbors.
type parseNeighsFunc func(sc *bufio.Scanner, lenHint int) (ns []Neighbor)
// cmdARPDB is the implementation of the ARPDB that uses command line to
// retrieve data.
type cmdARPDB struct {
parse parseNeighsFunc
ns *neighs
cmd string
args []string
}
// type check
var _ ARPDB = (*cmdARPDB)(nil)
// Refresh implements the ARPDB interface for *cmdARPDB.
func (arp *cmdARPDB) Refresh() (err error) {
defer func() { err = errors.Annotate(err, "cmd arpdb: %w") }()
code, out, err := aghosRunCommand(arp.cmd, arp.args...)
if err != nil {
return fmt.Errorf("running command: %w", err)
} else if code != 0 {
return fmt.Errorf("running command: unexpected exit code %d", code)
}
sc := bufio.NewScanner(bytes.NewReader(out))
ns := arp.parse(sc, arp.ns.len())
if err = sc.Err(); err != nil {
// TODO(e.burkov): This error seems unreachable. Investigate.
return fmt.Errorf("scanning the output: %w", err)
}
arp.ns.reset(ns)
return nil
}
// Neighbors implements the ARPDB interface for *cmdARPDB.
func (arp *cmdARPDB) Neighbors() (ns []Neighbor) {
return arp.ns.clone()
}
// Composite ARPDB
// arpdbs is the ARPDB that combines several ARPDB implementations and
// consequently switches between those.
type arpdbs struct {
// arps is the set of ARPDB implementations to range through.
arps []ARPDB
neighs
}
// newARPDBs returns a properly initialized *arpdbs. It begins refreshing from
// the first of arps.
func newARPDBs(arps ...ARPDB) (arp *arpdbs) {
return &arpdbs{
arps: arps,
neighs: neighs{
mu: &sync.RWMutex{},
ns: make([]Neighbor, 0),
},
}
}
// type check
var _ ARPDB = (*arpdbs)(nil)
// Refresh implements the ARPDB interface for *arpdbs.
func (arp *arpdbs) Refresh() (err error) {
var errs []error
for _, a := range arp.arps {
err = a.Refresh()
if err != nil {
errs = append(errs, err)
continue
}
arp.reset(a.Neighbors())
return nil
}
if len(errs) > 0 {
err = errors.List("each arpdb failed", errs...)
}
return err
}
// Neighbors implements the ARPDB interface for *arpdbs.
//
// TODO(e.burkov): Think of a way to avoid cloning the slice twice.
func (arp *arpdbs) Neighbors() (ns []Neighbor) {
return arp.clone()
}

76
internal/aghnet/arpdb_bsd.go Normal file
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@ -0,0 +1,76 @@
//go:build darwin || freebsd
// +build darwin freebsd
package aghnet
import (
"bufio"
"net"
"strings"
"sync"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
)
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 macOS and FreeBSD.
// The expected input format:
//
// host.name (192.168.0.1) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]
//
func parseArpA(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
ns = make([]Neighbor, 0, lenHint)
for sc.Scan() {
ln := sc.Text()
fields := strings.Fields(ln)
if len(fields) < 4 {
continue
}
n := Neighbor{}
if ipStr := fields[1]; len(ipStr) < 2 {
continue
} else if ip := net.ParseIP(ipStr[1 : len(ipStr)-1]); ip == nil {
continue
} else {
n.IP = ip
}
hwStr := fields[3]
if mac, err := net.ParseMAC(hwStr); err != nil {
continue
} else {
n.MAC = mac
}
host := fields[0]
if err := netutil.ValidateDomainName(host); err != nil {
log.Debug("parsing arp output: %s", err)
} else {
n.Name = host
}
ns = append(ns, n)
}
return ns
}

31
internal/aghnet/arpdb_bsd_test.go Normal file
View file

@ -0,0 +1,31 @@
//go:build darwin || freebsd
// +build darwin freebsd
package aghnet
import (
"net"
)
const arpAOutput = `
invalid.mac (1.2.3.4) at 12:34:56:78:910 on el0 ifscope [ethernet]
invalid.ip (1.2.3.4.5) at ab:cd:ef:ab:cd:12 on ek0 ifscope [ethernet]
invalid.fmt 1 at 12:cd:ef:ab:cd:ef on er0 ifscope [ethernet]
hostname.one (192.168.1.2) at ab:cd:ef:ab:cd:ef on en0 ifscope [ethernet]
hostname.two (::ffff:ffff) at ef:cd:ab:ef:cd:ab on em0 expires in 1198 seconds [ethernet]
? (::1234) at aa:bb:cc:dd:ee:ff on ej0 expires in 1918 seconds [ethernet]
`
var wantNeighs = []Neighbor{{
Name: "hostname.one",
IP: net.IPv4(192, 168, 1, 2),
MAC: net.HardwareAddr{0xAB, 0xCD, 0xEF, 0xAB, 0xCD, 0xEF},
}, {
Name: "hostname.two",
IP: net.ParseIP("::ffff:ffff"),
MAC: net.HardwareAddr{0xEF, 0xCD, 0xAB, 0xEF, 0xCD, 0xAB},
}, {
Name: "",
IP: net.ParseIP("::1234"),
MAC: net.HardwareAddr{0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF},
}}

243
internal/aghnet/arpdb_linux.go Normal file
View file

@ -0,0 +1,243 @@
//go:build linux
// +build linux
package aghnet
import (
"bufio"
"fmt"
"io/fs"
"net"
"strings"
"sync"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
"github.com/AdguardTeam/golibs/stringutil"
)
func newARPDB() (arp *arpdbs) {
// Use the common storage among the implementations.
ns := &neighs{
mu: &sync.RWMutex{},
ns: make([]Neighbor, 0),
}
var parseF parseNeighsFunc
if aghos.IsOpenWrt() {
parseF = parseArpAWrt
} else {
parseF = parseArpA
}
return newARPDBs(
// Try /proc/net/arp first.
&fsysARPDB{
ns: ns,
fsys: rootDirFS,
filename: "proc/net/arp",
},
// Then, try "arp -a -n".
&cmdARPDB{
parse: parseF,
ns: ns,
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"},
},
// Finally, try "ip neigh".
&cmdARPDB{
parse: parseIPNeigh,
ns: ns,
cmd: "ip",
args: []string{"neigh"},
},
)
}
// fsysARPDB accesses the ARP cache file to update the database.
type fsysARPDB struct {
ns *neighs
fsys fs.FS
filename string
}
// type check
var _ ARPDB = (*fsysARPDB)(nil)
// Refresh implements the ARPDB interface for *fsysARPDB.
func (arp *fsysARPDB) Refresh() (err error) {
var f fs.File
f, err = arp.fsys.Open(arp.filename)
if err != nil {
return fmt.Errorf("opening %q: %w", arp.filename, err)
}
sc := bufio.NewScanner(f)
// Skip the header.
if !sc.Scan() {
return nil
} else if err = sc.Err(); err != nil {
return err
}
ns := make([]Neighbor, 0, arp.ns.len())
for sc.Scan() {
ln := sc.Text()
fields := stringutil.SplitTrimmed(ln, " ")
if len(fields) != 6 {
continue
}
n := Neighbor{}
if n.IP = net.ParseIP(fields[0]); n.IP == nil || n.IP.IsUnspecified() {
continue
} else if n.MAC, err = net.ParseMAC(fields[3]); err != nil {
continue
}
ns = append(ns, n)
}
arp.ns.reset(ns)
return nil
}
// Neighbors implements the ARPDB interface for *fsysARPDB.
func (arp *fsysARPDB) Neighbors() (ns []Neighbor) {
return arp.ns.clone()
}
// parseArpAWrt parses the output of the "arp -a -n" command on OpenWrt. The
// expected input format:
//
// IP address HW type Flags HW address Mask Device
// 192.168.11.98 0x1 0x2 5a:92:df:a9:7e:28 * wan
//
func parseArpAWrt(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
if !sc.Scan() {
// Skip the header.
return
}
ns = make([]Neighbor, 0, lenHint)
for sc.Scan() {
ln := sc.Text()
fields := strings.Fields(ln)
if len(fields) < 4 {
continue
}
n := Neighbor{}
if ip := net.ParseIP(fields[0]); ip == nil || n.IP.IsUnspecified() {
continue
} else {
n.IP = ip
}
hwStr := fields[3]
if mac, err := net.ParseMAC(hwStr); err != nil {
log.Debug("parsing arp output: %s", err)
continue
} else {
n.MAC = mac
}
ns = append(ns, n)
}
return ns
}
// parseArpA parses the output of the "arp -a -n" command on Linux. The
// expected input format:
//
// hostname (192.168.1.1) at ab:cd:ef:ab:cd:ef [ether] on enp0s3
//
func parseArpA(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
ns = make([]Neighbor, 0, lenHint)
for sc.Scan() {
ln := sc.Text()
fields := strings.Fields(ln)
if len(fields) < 4 {
continue
}
n := Neighbor{}
if ipStr := fields[1]; len(ipStr) < 2 {
continue
} else if ip := net.ParseIP(ipStr[1 : len(ipStr)-1]); ip == nil {
continue
} else {
n.IP = ip
}
hwStr := fields[3]
if mac, err := net.ParseMAC(hwStr); err != nil {
log.Debug("parsing arp output: %s", err)
continue
} else {
n.MAC = mac
}
host := fields[0]
if verr := netutil.ValidateDomainName(host); verr != nil {
log.Debug("parsing arp output: %s", verr)
} else {
n.Name = host
}
ns = append(ns, n)
}
return ns
}
// parseIPNeigh parses the output of the "ip neigh" command on Linux. The
// expected input format:
//
// 192.168.1.1 dev enp0s3 lladdr ab:cd:ef:ab:cd:ef REACHABLE
//
func parseIPNeigh(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
ns = make([]Neighbor, 0, lenHint)
for sc.Scan() {
ln := sc.Text()
fields := strings.Fields(ln)
if len(fields) < 5 {
continue
}
n := Neighbor{}
if ip := net.ParseIP(fields[0]); ip == nil {
continue
} else {
n.IP = ip
}
if mac, err := net.ParseMAC(fields[4]); err != nil {
log.Debug("parsing arp output: %s", err)
continue
} else {
n.MAC = mac
}
ns = append(ns, n)
}
return ns
}

102
internal/aghnet/arpdb_linux_test.go Normal file
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@ -0,0 +1,102 @@
//go:build linux
// +build linux
package aghnet
import (
"net"
"sync"
"testing"
"testing/fstest"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const arpAOutputWrt = `
IP address HW type Flags HW address Mask Device
1.2.3.4.5 0x1 0x2 aa:bb:cc:dd:ee:ff * wan
1.2.3.4 0x1 0x2 12:34:56:78:910 * wan
192.168.1.2 0x1 0x2 ab:cd:ef:ab:cd:ef * wan
::ffff:ffff 0x1 0x2 ef:cd:ab:ef:cd:ab * wan`
const arpAOutput = `
invalid.mac (1.2.3.4) at 12:34:56:78:910 on el0 ifscope [ethernet]
invalid.ip (1.2.3.4.5) at ab:cd:ef:ab:cd:12 on ek0 ifscope [ethernet]
invalid.fmt 1 at 12:cd:ef:ab:cd:ef on er0 ifscope [ethernet]
? (192.168.1.2) at ab:cd:ef:ab:cd:ef on en0 ifscope [ethernet]
? (::ffff:ffff) at ef:cd:ab:ef:cd:ab on em0 expires in 100 seconds [ethernet]`
const ipNeighOutput = `
1.2.3.4.5 dev enp0s3 lladdr aa:bb:cc:dd:ee:ff DELAY
1.2.3.4 dev enp0s3 lladdr 12:34:56:78:910 DELAY
192.168.1.2 dev enp0s3 lladdr ab:cd:ef:ab:cd:ef DELAY
::ffff:ffff dev enp0s3 lladdr ef:cd:ab:ef:cd:ab router STALE`
var wantNeighs = []Neighbor{{
IP: net.IPv4(192, 168, 1, 2),
MAC: net.HardwareAddr{0xAB, 0xCD, 0xEF, 0xAB, 0xCD, 0xEF},
}, {
IP: net.ParseIP("::ffff:ffff"),
MAC: net.HardwareAddr{0xEF, 0xCD, 0xAB, 0xEF, 0xCD, 0xAB},
}}
func TestFSysARPDB(t *testing.T) {
require.NoError(t, fstest.TestFS(testdata, "proc_net_arp"))
a := &fsysARPDB{
ns: &neighs{
mu: &sync.RWMutex{},
ns: make([]Neighbor, 0),
},
fsys: testdata,
filename: "proc_net_arp",
}
err := a.Refresh()
require.NoError(t, err)
ns := a.Neighbors()
assert.Equal(t, wantNeighs, ns)
}
func TestCmdARPDB_linux(t *testing.T) {
sh := mapShell{
"arp -a": {err: nil, out: arpAOutputWrt, code: 0},
"ip neigh": {err: nil, out: ipNeighOutput, code: 0},
}
substShell(t, sh.RunCmd)
t.Run("wrt", func(t *testing.T) {
a := &cmdARPDB{
parse: parseArpAWrt,
cmd: "arp",
args: []string{"-a"},
ns: &neighs{
mu: &sync.RWMutex{},
ns: make([]Neighbor, 0),
},
}
err := a.Refresh()
require.NoError(t, err)
assert.Equal(t, wantNeighs, a.Neighbors())
})
t.Run("ip_neigh", func(t *testing.T) {
a := &cmdARPDB{
parse: parseIPNeigh,
cmd: "ip",
args: []string{"neigh"},
ns: &neighs{
mu: &sync.RWMutex{},
ns: make([]Neighbor, 0),
},
}
err := a.Refresh()
require.NoError(t, err)
assert.Equal(t, wantNeighs, a.Neighbors())
})
}

73
internal/aghnet/arpdb_openbsd.go Normal file
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@ -0,0 +1,73 @@
//go:build openbsd
// +build openbsd
package aghnet
import (
"bufio"
"net"
"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{}
if ip := net.ParseIP(fields[0]); ip == nil {
continue
} else {
n.IP = ip
}
if mac, err := net.ParseMAC(fields[1]); err != nil {
log.Debug("parsing arp output: %s", err)
continue
} else {
n.MAC = mac
}
ns = append(ns, n)
}
return ns
}

24
internal/aghnet/arpdb_openbsd_test.go Normal file
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@ -0,0 +1,24 @@
//go:build openbsd
// +build openbsd
package aghnet
import (
"net"
)
const arpAOutput = `
Host Ethernet Address Netif Expire Flags
1.2.3.4.5 aa:bb:cc:dd:ee:ff em0 permanent
1.2.3.4 12:34:56:78:910 em0 permanent
192.168.1.2 ab:cd:ef:ab:cd:ef em0 19m56s
::ffff:ffff ef:cd:ab:ef:cd:ab em0 permanent l
`
var wantNeighs = []Neighbor{{
IP: net.IPv4(192, 168, 1, 2),
MAC: net.HardwareAddr{0xAB, 0xCD, 0xEF, 0xAB, 0xCD, 0xEF},
}, {
IP: net.ParseIP("::ffff:ffff"),
MAC: net.HardwareAddr{0xEF, 0xCD, 0xAB, 0xEF, 0xCD, 0xAB},
}}

216
internal/aghnet/arpdb_test.go Normal file
View file

@ -0,0 +1,216 @@
package aghnet
import (
"net"
"sync"
"testing"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestNewARPDB(t *testing.T) {
var a ARPDB
require.NotPanics(t, func() { a = NewARPDB() })
assert.NotNil(t, a)
}
// TestARPDB is the mock implementation of ARPDB to use in tests.
type TestARPDB struct {
OnRefresh func() (err error)
OnNeighbors func() (ns []Neighbor)
}
// Refresh implements the ARPDB interface for *TestARPDB.
func (arp *TestARPDB) Refresh() (err error) {
return arp.OnRefresh()
}
// Neighbors implements the ARPDB interface for *TestARPDB.
func (arp *TestARPDB) Neighbors() (ns []Neighbor) {
return arp.OnNeighbors()
}
func TestARPDBS(t *testing.T) {
knownIP := net.IP{1, 2, 3, 4}
knownMAC := net.HardwareAddr{0xAB, 0xCD, 0xEF, 0xAB, 0xCD, 0xEF}
succRefrCount, failRefrCount := 0, 0
clnp := func() {
succRefrCount, failRefrCount = 0, 0
}
succDB := &TestARPDB{
OnRefresh: func() (err error) { succRefrCount++; return nil },
OnNeighbors: func() (ns []Neighbor) {
return []Neighbor{{Name: "abc", IP: knownIP, MAC: knownMAC}}
},
}
failDB := &TestARPDB{
OnRefresh: func() (err error) { failRefrCount++; return errors.Error("refresh failed") },
OnNeighbors: func() (ns []Neighbor) { return nil },
}
t.Run("begin_with_success", func(t *testing.T) {
t.Cleanup(clnp)
a := newARPDBs(succDB, failDB)
err := a.Refresh()
require.NoError(t, err)
assert.Equal(t, 1, succRefrCount)
assert.Zero(t, failRefrCount)
assert.NotEmpty(t, a.Neighbors())
})
t.Run("begin_with_fail", func(t *testing.T) {
t.Cleanup(clnp)
a := newARPDBs(failDB, succDB)
err := a.Refresh()
require.NoError(t, err)
assert.Equal(t, 1, succRefrCount)
assert.Equal(t, 1, failRefrCount)
assert.NotEmpty(t, a.Neighbors())
})
t.Run("fail_only", func(t *testing.T) {
t.Cleanup(clnp)
wantMsg := `each arpdb failed: 2 errors: "refresh failed", "refresh failed"`
a := newARPDBs(failDB, failDB)
err := a.Refresh()
require.Error(t, err)
testutil.AssertErrorMsg(t, wantMsg, err)
assert.Equal(t, 2, failRefrCount)
assert.Empty(t, a.Neighbors())
})
t.Run("fail_after_success", func(t *testing.T) {
t.Cleanup(clnp)
shouldFail := false
unstableDB := &TestARPDB{
OnRefresh: func() (err error) {
if shouldFail {
err = errors.Error("unstable failed")
}
shouldFail = !shouldFail
return err
},
OnNeighbors: func() (ns []Neighbor) {
if !shouldFail {
return failDB.OnNeighbors()
}
return succDB.OnNeighbors()
},
}
a := newARPDBs(unstableDB, succDB)
// Unstable ARPDB should refresh successfully.
err := a.Refresh()
require.NoError(t, err)
assert.Zero(t, succRefrCount)
assert.NotEmpty(t, a.Neighbors())
// Unstable ARPDB should fail and the succDB should be used.
err = a.Refresh()
require.NoError(t, err)
assert.Equal(t, 1, succRefrCount)
assert.NotEmpty(t, a.Neighbors())
// Unstable ARPDB should refresh successfully again.
err = a.Refresh()
require.NoError(t, err)
assert.Equal(t, 1, succRefrCount)
assert.NotEmpty(t, a.Neighbors())
})
t.Run("empty", func(t *testing.T) {
a := newARPDBs()
require.NoError(t, a.Refresh())
assert.Empty(t, a.Neighbors())
})
}
func TestCmdARPDB_arpa(t *testing.T) {
a := &cmdARPDB{
cmd: "cmd",
parse: parseArpA,
ns: &neighs{
mu: &sync.RWMutex{},
ns: make([]Neighbor, 0),
},
}
t.Run("arp_a", func(t *testing.T) {
sh := theOnlyCmd("cmd", 0, arpAOutput, nil)
substShell(t, sh.RunCmd)
err := a.Refresh()
require.NoError(t, err)
assert.Equal(t, wantNeighs, a.Neighbors())
})
t.Run("runcmd_error", func(t *testing.T) {
sh := theOnlyCmd("cmd", 0, "", errors.Error("can't run"))
substShell(t, sh.RunCmd)
err := a.Refresh()
testutil.AssertErrorMsg(t, "cmd arpdb: running command: can't run", err)
})
t.Run("bad_code", func(t *testing.T) {
sh := theOnlyCmd("cmd", 1, "", nil)
substShell(t, sh.RunCmd)
err := a.Refresh()
testutil.AssertErrorMsg(t, "cmd arpdb: running command: unexpected exit code 1", err)
})
t.Run("empty", func(t *testing.T) {
sh := theOnlyCmd("cmd", 0, "", nil)
substShell(t, sh.RunCmd)
err := a.Refresh()
require.NoError(t, err)
assert.Empty(t, a.Neighbors())
})
}
func TestEmptyARPDB(t *testing.T) {
a := EmptyARPDB{}
t.Run("refresh", func(t *testing.T) {
var err error
require.NotPanics(t, func() {
err = a.Refresh()
})
assert.NoError(t, err)
})
t.Run("neighbors", func(t *testing.T) {
var ns []Neighbor
require.NotPanics(t, func() {
ns = a.Neighbors()
})
assert.Empty(t, ns)
})
}

65
internal/aghnet/arpdb_windows.go Normal file
View file

@ -0,0 +1,65 @@
//go:build windows
// +build windows
package aghnet
import (
"bufio"
"net"
"strings"
"sync"
)
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
}
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
}

23
internal/aghnet/arpdb_windows_test.go Normal file
View file

@ -0,0 +1,23 @@
//go:build windows
// +build windows
package aghnet
import (
"net"
)
const arpAOutput = `
Interface: 192.168.1.1 --- 0x7
Internet Address Physical Address Type
192.168.1.2 ab-cd-ef-ab-cd-ef dynamic
::ffff:ffff ef-cd-ab-ef-cd-ab static`
var wantNeighs = []Neighbor{{
IP: net.IPv4(192, 168, 1, 2),
MAC: net.HardwareAddr{0xAB, 0xCD, 0xEF, 0xAB, 0xCD, 0xEF},
}, {
IP: net.ParseIP("::ffff:ffff"),
MAC: net.HardwareAddr{0xEF, 0xCD, 0xAB, 0xEF, 0xCD, 0xAB},
}}

9
internal/aghnet/hostgen.go
View file

@ -11,7 +11,7 @@ const (
ipv6HostnameMaxLen = len("ff80-f076-0000-0000-0000-0000-0000-0010")
)
// generateIPv4Hostname generates the hostname for specific IP version.
// generateIPv4Hostname generates the hostname by IP address version 4.
func generateIPv4Hostname(ipv4 net.IP) (hostname string) {
hnData := make([]byte, 0, ipv4HostnameMaxLen)
for i, part := range ipv4 {
@ -24,7 +24,7 @@ func generateIPv4Hostname(ipv4 net.IP) (hostname string) {
return string(hnData)
}
// generateIPv6Hostname generates the hostname for specific IP version.
// generateIPv6Hostname generates the hostname by IP address version 6.
func generateIPv6Hostname(ipv6 net.IP) (hostname string) {
hnData := make([]byte, 0, ipv6HostnameMaxLen)
for i, partsNum := 0, net.IPv6len/2; i < partsNum; i++ {
@ -51,12 +51,11 @@ func generateIPv6Hostname(ipv6 net.IP) (hostname string) {
//
// ff80-f076-0000-0000-0000-0000-0000-0010
//
// ip must be either an IPv4 or an IPv6.
func GenerateHostname(ip net.IP) (hostname string) {
if ipv4 := ip.To4(); ipv4 != nil {
return generateIPv4Hostname(ipv4)
} else if ipv6 := ip.To16(); ipv6 != nil {
return generateIPv6Hostname(ipv6)
}
return ""
return generateIPv6Hostname(ip)
}

48
internal/aghnet/hostgen_test.go
View file

@ -8,6 +8,7 @@ import (
)
func TestGenerateHostName(t *testing.T) {
t.Run("valid", func(t *testing.T) {
testCases := []struct {
name string
want string
@ -16,27 +17,14 @@ func TestGenerateHostName(t *testing.T) {
name: "good_ipv4",
want: "127-0-0-1",
ip: net.IP{127, 0, 0, 1},
}, {
name: "bad_ipv4",
want: "",
ip: net.IP{127, 0, 0, 1, 0},
}, {
name: "good_ipv6",
want: "fe00-0000-0000-0000-0000-0000-0000-0001",
ip: net.ParseIP("fe00::1"),
}, {
name: "bad_ipv6",
want: "",
ip: net.IP{
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff,
},
}, {
name: "nil",
want: "",
ip: nil,
name: "4to6",
want: "1-2-3-4",
ip: net.ParseIP("::ffff:1.2.3.4"),
}}
for _, tc := range testCases {
@ -45,4 +33,32 @@ func TestGenerateHostName(t *testing.T) {
assert.Equal(t, tc.want, hostname)
})
}
})
t.Run("invalid", func(t *testing.T) {
testCases := []struct {
name string
ip net.IP
}{{
name: "bad_ipv4",
ip: net.IP{127, 0, 0, 1, 0},
}, {
name: "bad_ipv6",
ip: net.IP{
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff,
},
}, {
name: "nil",
ip: nil,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
assert.Panics(t, func() { GenerateHostname(tc.ip) })
})
}
})
}

4
internal/aghnet/hostscontainer.go
View file

@ -368,8 +368,8 @@ func (hp *hostsParser) addPairs(ip net.IP, hosts []string) {
}
}
// writeRules writes the actual rule for the qtype and the PTR for the
// host-ip pair into internal builders.
// writeRules writes the actual rule for the qtype and the PTR for the host-ip
// pair into internal builders.
func (hp *hostsParser) writeRules(host string, ip net.IP) (rule, rulePtr string) {
arpa, err := netutil.IPToReversedAddr(ip)
if err != nil {

94
internal/aghnet/net.go
View file

@ -2,19 +2,31 @@
package aghnet
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net"
"os/exec"
"strings"
"syscall"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
)
// Variables and functions to substitute in tests.
var (
// aghosRunCommand is the function to run shell commands.
aghosRunCommand = aghos.RunCommand
// netInterfaces is the function to get the available network interfaces.
netInterfaceAddrs = net.InterfaceAddrs
// rootDirFS is the filesystem pointing to the root directory.
rootDirFS = aghos.RootDirFS()
)
// ErrNoStaticIPInfo is returned by IfaceHasStaticIP when no information about
// the IP being static is available.
const ErrNoStaticIPInfo errors.Error = "no information about static ip"
@ -32,39 +44,29 @@ func IfaceSetStaticIP(ifaceName string) (err error) {
}
// GatewayIP returns IP address of interface's gateway.
func GatewayIP(ifaceName string) net.IP {
cmd := exec.Command("ip", "route", "show", "dev", ifaceName)
log.Tracef("executing %s %v", cmd.Path, cmd.Args)
d, err := cmd.Output()
if err != nil || cmd.ProcessState.ExitCode() != 0 {
//
// TODO(e.burkov): Investigate if the gateway address may be fetched in another
// way since not every machine has the software installed.
func GatewayIP(ifaceName string) (ip net.IP) {
code, out, err := aghosRunCommand("ip", "route", "show", "dev", ifaceName)
if err != nil {
log.Debug("%s", err)
return nil
} else if code != 0 {
log.Debug("fetching gateway ip: unexpected exit code: %d", code)
return nil
}
fields := strings.Fields(string(d))
fields := bytes.Fields(out)
// The meaningful "ip route" command output should contain the word
// "default" at first field and default gateway IP address at third field.
if len(fields) < 3 || fields[0] != "default" {
if len(fields) < 3 || string(fields[0]) != "default" {
return nil
}
return net.ParseIP(fields[2])
}
// CanBindPort checks if we can bind to the given port.
func CanBindPort(port int) (can bool, err error) {
var addr *net.TCPAddr
addr, err = net.ResolveTCPAddr("tcp", fmt.Sprintf("127.0.0.1:%d", port))
if err != nil {
return false, err
}
var listener *net.TCPListener
listener, err = net.ListenTCP("tcp", addr)
if err != nil {
return false, err
}
_ = listener.Close()
return true, nil
return net.ParseIP(string(fields[2]))
}
// CanBindPrivilegedPorts checks if current process can bind to privileged
@ -99,19 +101,19 @@ func (iface NetInterface) MarshalJSON() ([]byte, error) {
})
}
// GetValidNetInterfacesForWeb returns interfaces that are eligible for DNS and WEB only
// we do not return link-local addresses here
func GetValidNetInterfacesForWeb() ([]*NetInterface, error) {
// GetValidNetInterfacesForWeb returns interfaces that are eligible for DNS and
// WEB only we do not return link-local addresses here.
//
// TODO(e.burkov): Can't properly test the function since it's nontrivial to
// substitute net.Interface.Addrs and the net.InterfaceAddrs can't be used.
func GetValidNetInterfacesForWeb() (netIfaces []*NetInterface, err error) {
ifaces, err := net.Interfaces()
if err != nil {
return nil, fmt.Errorf("couldn't get interfaces: %w", err)
}
if len(ifaces) == 0 {
} else if len(ifaces) == 0 {
return nil, errors.Error("couldn't find any legible interface")
}
var netInterfaces []*NetInterface
for _, iface := range ifaces {
var addrs []net.Addr
addrs, err = iface.Addrs()
@ -131,26 +133,30 @@ func GetValidNetInterfacesForWeb() ([]*NetInterface, error) {
ipNet, ok := addr.(*net.IPNet)
if !ok {
// Should be net.IPNet, this is weird.
return nil, fmt.Errorf("got iface.Addrs() element %s that is not net.IPNet, it is %T", addr, addr)
return nil, fmt.Errorf("got %s that is not net.IPNet, it is %T", addr, addr)
}
// Ignore link-local.
if ipNet.IP.IsLinkLocalUnicast() {
continue
}
netIface.Addresses = append(netIface.Addresses, ipNet.IP)
netIface.Subnets = append(netIface.Subnets, ipNet)
}
// Discard interfaces with no addresses.
if len(netIface.Addresses) != 0 {
netInterfaces = append(netInterfaces, netIface)
netIfaces = append(netIfaces, netIface)
}
}
return netInterfaces, nil
return netIfaces, nil
}
// GetInterfaceByIP returns the name of interface containing provided ip.
//
// TODO(e.burkov): See TODO on GetValidInterfacesForWeb.
func GetInterfaceByIP(ip net.IP) string {
ifaces, err := GetValidNetInterfacesForWeb()
if err != nil {
@ -170,6 +176,8 @@ func GetInterfaceByIP(ip net.IP) string {
// GetSubnet returns pointer to net.IPNet for the specified interface or nil if
// the search fails.
//
// TODO(e.burkov): See TODO on GetValidInterfacesForWeb.
func GetSubnet(ifaceName string) *net.IPNet {
netIfaces, err := GetValidNetInterfacesForWeb()
if err != nil {
@ -220,17 +228,10 @@ func IsAddrInUse(err error) (ok bool) {
// CollectAllIfacesAddrs returns the slice of all network interfaces IP
// addresses without port number.
func CollectAllIfacesAddrs() (addrs []string, err error) {
var ifaces []net.Interface
ifaces, err = net.Interfaces()
if err != nil {
return nil, fmt.Errorf("getting network interfaces: %w", err)
}
for _, iface := range ifaces {
var ifaceAddrs []net.Addr
ifaceAddrs, err = iface.Addrs()
ifaceAddrs, err = netInterfaceAddrs()
if err != nil {
return nil, fmt.Errorf("getting addresses for %q: %w", iface.Name, err)
return nil, fmt.Errorf("getting interfaces addresses: %w", err)
}
for _, addr := range ifaceAddrs {
@ -243,7 +244,6 @@ func CollectAllIfacesAddrs() (addrs []string, err error) {
addrs = append(addrs, ip.String())
}
}
return addrs, nil
}

128
internal/aghnet/net_darwin.go
View file

@ -4,10 +4,11 @@
package aghnet
import (
"bufio"
"bytes"
"fmt"
"os"
"io"
"regexp"
"strings"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/errors"
@ -23,7 +24,7 @@ type hardwarePortInfo struct {
static bool
}
func ifaceHasStaticIP(ifaceName string) (bool, error) {
func ifaceHasStaticIP(ifaceName string) (ok bool, err error) {
portInfo, err := getCurrentHardwarePortInfo(ifaceName)
if err != nil {
return false, err
@ -32,9 +33,10 @@ func ifaceHasStaticIP(ifaceName string) (bool, error) {
return portInfo.static, nil
}
// getCurrentHardwarePortInfo gets information for the specified network interface.
// getCurrentHardwarePortInfo gets information for the specified network
// interface.
func getCurrentHardwarePortInfo(ifaceName string) (hardwarePortInfo, error) {
// First of all we should find hardware port name
// First of all we should find hardware port name.
m := getNetworkSetupHardwareReports()
hardwarePort, ok := m[ifaceName]
if !ok {
@ -44,6 +46,10 @@ func getCurrentHardwarePortInfo(ifaceName string) (hardwarePortInfo, error) {
return getHardwarePortInfo(hardwarePort)
}
// hardwareReportsReg is the regular expression matching the lines of
// networksetup command output lines containing the interface information.
var hardwareReportsReg = regexp.MustCompile("Hardware Port: (.*?)\nDevice: (.*?)\n")
// getNetworkSetupHardwareReports parses the output of the `networksetup
// -listallhardwareports` command it returns a map where the key is the
// interface name, and the value is the "hardware port" returns nil if it fails
@ -52,54 +58,44 @@ func getCurrentHardwarePortInfo(ifaceName string) (hardwarePortInfo, error) {
// TODO(e.burkov): There should be more proper approach than parsing the
// command output. For example, see
// https://developer.apple.com/documentation/systemconfiguration.
func getNetworkSetupHardwareReports() map[string]string {
_, out, err := aghos.RunCommand("networksetup", "-listallhardwareports")
func getNetworkSetupHardwareReports() (reports map[string]string) {
_, out, err := aghosRunCommand("networksetup", "-listallhardwareports")
if err != nil {
return nil
}
re, err := regexp.Compile("Hardware Port: (.*?)\nDevice: (.*?)\n")
if err != nil {
return nil
reports = make(map[string]string)
matches := hardwareReportsReg.FindAllSubmatch(out, -1)
for _, m := range matches {
reports[string(m[2])] = string(m[1])
}
m := make(map[string]string)
matches := re.FindAllStringSubmatch(out, -1)
for i := range matches {
port := matches[i][1]
device := matches[i][2]
m[device] = port
return reports
}
return m
}
// hardwarePortReg is the regular expression matching the lines of networksetup
// command output lines containing the port information.
var hardwarePortReg = regexp.MustCompile("IP address: (.*?)\nSubnet mask: (.*?)\nRouter: (.*?)\n")
func getHardwarePortInfo(hardwarePort string) (hardwarePortInfo, error) {
h := hardwarePortInfo{}
_, out, err := aghos.RunCommand("networksetup", "-getinfo", hardwarePort)
func getHardwarePortInfo(hardwarePort string) (h hardwarePortInfo, err error) {
_, out, err := aghosRunCommand("networksetup", "-getinfo", hardwarePort)
if err != nil {
return h, err
}
re := regexp.MustCompile("IP address: (.*?)\nSubnet mask: (.*?)\nRouter: (.*?)\n")
match := re.FindStringSubmatch(out)
if len(match) == 0 {
match := hardwarePortReg.FindSubmatch(out)
if len(match) != 4 {
return h, errors.Error("could not find hardware port info")
}
h.name = hardwarePort
h.ip = match[1]
h.subnet = match[2]
h.gatewayIP = match[3]
if strings.Index(out, "Manual Configuration") == 0 {
h.static = true
}
return h, nil
return hardwarePortInfo{
name: hardwarePort,
ip: string(match[1]),
subnet: string(match[2]),
gatewayIP: string(match[3]),
static: bytes.Index(out, []byte("Manual Configuration")) == 0,
}, nil
}
func ifaceSetStaticIP(ifaceName string) (err error) {
@ -109,7 +105,7 @@ func ifaceSetStaticIP(ifaceName string) (err error) {
}
if portInfo.static {
return errors.Error("IP address is already static")
return errors.Error("ip address is already static")
}
dnsAddrs, err := getEtcResolvConfServers()
@ -117,50 +113,62 @@ func ifaceSetStaticIP(ifaceName string) (err error) {
return err
}
args := make([]string, 0)
args = append(args, "-setdnsservers", portInfo.name)
args = append(args, dnsAddrs...)
args := append([]string{"-setdnsservers", portInfo.name}, dnsAddrs...)
// Setting DNS servers is necessary when configuring a static IP
code, _, err := aghos.RunCommand("networksetup", args...)
code, _, err := aghosRunCommand("networksetup", args...)
if err != nil {
return err
}
if code != 0 {
} else if code != 0 {
return fmt.Errorf("failed to set DNS servers, code=%d", code)
}
// Actually configures hardware port to have static IP
code, _, err = aghos.RunCommand("networksetup", "-setmanual",
portInfo.name, portInfo.ip, portInfo.subnet, portInfo.gatewayIP)
code, _, err = aghosRunCommand(
"networksetup",
"-setmanual",
portInfo.name,
portInfo.ip,
portInfo.subnet,
portInfo.gatewayIP,
)
if err != nil {
return err
}
if code != 0 {
} else if code != 0 {
return fmt.Errorf("failed to set DNS servers, code=%d", code)
}
return nil
}
// etcResolvConfReg is the regular expression matching the lines of resolv.conf
// file containing a name server information.
var etcResolvConfReg = regexp.MustCompile("nameserver ([a-zA-Z0-9.:]+)")
// getEtcResolvConfServers returns a list of nameservers configured in
// /etc/resolv.conf.
func getEtcResolvConfServers() ([]string, error) {
body, err := os.ReadFile("/etc/resolv.conf")
if err != nil {
return nil, err
}
func getEtcResolvConfServers() (addrs []string, err error) {
const filename = "etc/resolv.conf"
re := regexp.MustCompile("nameserver ([a-zA-Z0-9.:]+)")
matches := re.FindAllStringSubmatch(string(body), -1)
_, err = aghos.FileWalker(func(r io.Reader) (_ []string, _ bool, err error) {
sc := bufio.NewScanner(r)
for sc.Scan() {
matches := etcResolvConfReg.FindAllStringSubmatch(sc.Text(), -1)
if len(matches) == 0 {
return nil, errors.Error("found no DNS servers in /etc/resolv.conf")
continue
}
addrs := make([]string, 0)
for i := range matches {
addrs = append(addrs, matches[i][1])
for _, m := range matches {
addrs = append(addrs, m[1])
}
}
return nil, false, sc.Err()
}).Walk(rootDirFS, filename)
if err != nil {
return nil, fmt.Errorf("parsing etc/resolv.conf file: %w", err)
} else if len(addrs) == 0 {
return nil, fmt.Errorf("found no dns servers in %s", filename)
}
return addrs, nil

261
internal/aghnet/net_darwin_test.go Normal file
View file

@ -0,0 +1,261 @@
package aghnet
import (
"io/fs"
"testing"
"testing/fstest"
"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/testutil"
"github.com/stretchr/testify/assert"
)
func TestIfaceHasStaticIP(t *testing.T) {
testCases := []struct {
name string
shell mapShell
ifaceName string
wantHas assert.BoolAssertionFunc
wantErrMsg string
}{{
name: "success",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "IP address: 1.2.3.4\nSubnet mask: 255.255.255.0\nRouter: 1.2.3.1\n",
code: 0,
},
},
ifaceName: "en0",
wantHas: assert.False,
wantErrMsg: ``,
}, {
name: "success_static",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "Manual Configuration\nIP address: 1.2.3.4\n" +
"Subnet mask: 255.255.255.0\nRouter: 1.2.3.1\n",
code: 0,
},
},
ifaceName: "en0",
wantHas: assert.True,
wantErrMsg: ``,
}, {
name: "reports_error",
shell: theOnlyCmd(
"networksetup -listallhardwareports",
0,
"",
errors.Error("can't list"),
),
ifaceName: "en0",
wantHas: assert.False,
wantErrMsg: `could not find hardware port for en0`,
}, {
name: "port_error",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: errors.Error("can't get"),
out: ``,
code: 0,
},
},
ifaceName: "en0",
wantHas: assert.False,
wantErrMsg: `can't get`,
}, {
name: "port_bad_output",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "nothing meaningful",
code: 0,
},
},
ifaceName: "en0",
wantHas: assert.False,
wantErrMsg: `could not find hardware port info`,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
substShell(t, tc.shell.RunCmd)
has, err := IfaceHasStaticIP(tc.ifaceName)
testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
tc.wantHas(t, has)
})
}
}
func TestIfaceSetStaticIP(t *testing.T) {
succFsys := fstest.MapFS{
"etc/resolv.conf": &fstest.MapFile{
Data: []byte(`nameserver 1.1.1.1`),
},
}
panicFsys := &aghtest.FS{
OnOpen: func(name string) (fs.File, error) { panic("not implemented") },
}
testCases := []struct {
name string
shell mapShell
fsys fs.FS
wantErrMsg string
}{{
name: "success",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "IP address: 1.2.3.4\nSubnet mask: 255.255.255.0\nRouter: 1.2.3.1\n",
code: 0,
},
"networksetup -setdnsservers hwport 1.1.1.1": {
err: nil,
out: "",
code: 0,
},
"networksetup -setmanual hwport 1.2.3.4 255.255.255.0 1.2.3.1": {
err: nil,
out: "",
code: 0,
},
},
fsys: succFsys,
wantErrMsg: ``,
}, {
name: "static_already",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "Manual Configuration\nIP address: 1.2.3.4\n" +
"Subnet mask: 255.255.255.0\nRouter: 1.2.3.1\n",
code: 0,
},
},
fsys: panicFsys,
wantErrMsg: `ip address is already static`,
}, {
name: "reports_error",
shell: theOnlyCmd(
"networksetup -listallhardwareports",
0,
"",
errors.Error("can't list"),
),
fsys: panicFsys,
wantErrMsg: `could not find hardware port for en0`,
}, {
name: "resolv_conf_error",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "IP address: 1.2.3.4\nSubnet mask: 255.255.255.0\nRouter: 1.2.3.1\n",
code: 0,
},
},
fsys: fstest.MapFS{
"etc/resolv.conf": &fstest.MapFile{
Data: []byte("this resolv.conf is invalid"),
},
},
wantErrMsg: `found no dns servers in etc/resolv.conf`,
}, {
name: "set_dns_error",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "IP address: 1.2.3.4\nSubnet mask: 255.255.255.0\nRouter: 1.2.3.1\n",
code: 0,
},
"networksetup -setdnsservers hwport 1.1.1.1": {
err: errors.Error("can't set"),
out: "",
code: 0,
},
},
fsys: succFsys,
wantErrMsg: `can't set`,
}, {
name: "set_manual_error",
shell: mapShell{
"networksetup -listallhardwareports": {
err: nil,
out: "Hardware Port: hwport\nDevice: en0\n",
code: 0,
},
"networksetup -getinfo hwport": {
err: nil,
out: "IP address: 1.2.3.4\nSubnet mask: 255.255.255.0\nRouter: 1.2.3.1\n",
code: 0,
},
"networksetup -setdnsservers hwport 1.1.1.1": {
err: nil,
out: "",
code: 0,
},
"networksetup -setmanual hwport 1.2.3.4 255.255.255.0 1.2.3.1": {
err: errors.Error("can't set"),
out: "",
code: 0,
},
},
fsys: succFsys,
wantErrMsg: `can't set`,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
substShell(t, tc.shell.RunCmd)
substRootDirFS(t, tc.fsys)
err := IfaceSetStaticIP("en0")
testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
})
}
}

2
internal/aghnet/net_freebsd.go
View file

@ -18,7 +18,7 @@ func ifaceHasStaticIP(ifaceName string) (ok bool, err error) {
walker := aghos.FileWalker(interfaceName(ifaceName).rcConfStaticConfig)
return walker.Walk(aghos.RootDirFS(), rcConfFilename)
return walker.Walk(rootDirFS, rcConfFilename)
}
// rcConfStaticConfig checks if the interface is configured by /etc/rc.conf to

64
internal/aghnet/net_freebsd_test.go
View file

@ -4,56 +4,74 @@
package aghnet
import (
"strings"
"io/fs"
"testing"
"testing/fstest"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestRcConfStaticConfig(t *testing.T) {
const iface interfaceName = `em0`
const nl = "\n"
func TestIfaceHasStaticIP(t *testing.T) {
const (
ifaceName = `em0`
rcConf = "etc/rc.conf"
)
testCases := []struct {
name string
rcconfData string
wantCont bool
rootFsys fs.FS
wantHas assert.BoolAssertionFunc
}{{
name: "simple",
rcconfData: `ifconfig_em0="inet 127.0.0.253 netmask 0xffffffff"` + nl,
wantCont: false,
rootFsys: fstest.MapFS{rcConf: &fstest.MapFile{
Data: []byte(`ifconfig_` + ifaceName + `="inet 127.0.0.253 netmask 0xffffffff"` + nl),
}},
wantHas: assert.True,
}, {
name: "case_insensitiveness",
rcconfData: `ifconfig_em0="InEt 127.0.0.253 NeTmAsK 0xffffffff"` + nl,
wantCont: false,
rootFsys: fstest.MapFS{rcConf: &fstest.MapFile{
Data: []byte(`ifconfig_` + ifaceName + `="InEt 127.0.0.253 NeTmAsK 0xffffffff"` + nl),
}},
wantHas: assert.True,
}, {
name: "comments_and_trash",
rcconfData: `# comment 1` + nl +
rootFsys: fstest.MapFS{rcConf: &fstest.MapFile{
Data: []byte(`# comment 1` + nl +
`` + nl +
`# comment 2` + nl +
`ifconfig_em0="inet 127.0.0.253 netmask 0xffffffff"` + nl,
wantCont: false,
`ifconfig_` + ifaceName + `="inet 127.0.0.253 netmask 0xffffffff"` + nl,
),
}},
wantHas: assert.True,
}, {
name: "aliases",
rcconfData: `ifconfig_em0_alias="inet 127.0.0.1/24"` + nl +
`ifconfig_em0="inet 127.0.0.253 netmask 0xffffffff"` + nl,
wantCont: false,
rootFsys: fstest.MapFS{rcConf: &fstest.MapFile{
Data: []byte(`ifconfig_` + ifaceName + `_alias="inet 127.0.0.1/24"` + nl +
`ifconfig_` + ifaceName + `="inet 127.0.0.253 netmask 0xffffffff"` + nl,
),
}},
wantHas: assert.True,
}, {
name: "incorrect_config",
rcconfData: `ifconfig_em0="inet6 127.0.0.253 netmask 0xffffffff"` + nl +
`ifconfig_em0="inet 256.256.256.256 netmask 0xffffffff"` + nl +
`ifconfig_em0=""` + nl,
wantCont: true,
rootFsys: fstest.MapFS{rcConf: &fstest.MapFile{
Data: []byte(
`ifconfig_` + ifaceName + `="inet6 127.0.0.253 netmask 0xffffffff"` + nl +
`ifconfig_` + ifaceName + `="inet 256.256.256.256 netmask 0xffffffff"` + nl +
`ifconfig_` + ifaceName + `=""` + nl,
),
}},
wantHas: assert.False,
}}
for _, tc := range testCases {
r := strings.NewReader(tc.rcconfData)
t.Run(tc.name, func(t *testing.T) {
_, cont, err := iface.rcConfStaticConfig(r)
substRootDirFS(t, tc.rootFsys)
has, err := IfaceHasStaticIP(ifaceName)
require.NoError(t, err)
assert.Equal(t, tc.wantCont, cont)
tc.wantHas(t, has)
})
}
}

91
internal/aghnet/net_linux.go
View file

@ -13,16 +13,33 @@ import (
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/stringutil"
"github.com/google/renameio/maybe"
"golang.org/x/sys/unix"
)
// dhcpсdConf is the name of /etc/dhcpcd.conf file in the root filesystem.
const dhcpcdConf = "etc/dhcpcd.conf"
func canBindPrivilegedPorts() (can bool, err error) {
cnbs, err := unix.PrctlRetInt(
unix.PR_CAP_AMBIENT,
unix.PR_CAP_AMBIENT_IS_SET,
unix.CAP_NET_BIND_SERVICE,
0,
0,
)
// Don't check the error because it's always nil on Linux.
adm, _ := aghos.HaveAdminRights()
return cnbs == 1 || adm, err
}
// dhcpcdStaticConfig checks if interface is configured by /etc/dhcpcd.conf to
// have a static IP.
func (n interfaceName) dhcpcdStaticConfig(r io.Reader) (subsources []string, cont bool, err error) {
s := bufio.NewScanner(r)
ifaceFound := findIfaceLine(s, string(n))
if !ifaceFound {
if !findIfaceLine(s, string(n)) {
return nil, true, s.Err()
}
@ -61,9 +78,9 @@ func (n interfaceName) ifacesStaticConfig(r io.Reader) (sub []string, cont bool,
fields := strings.Fields(line)
fieldsNum := len(fields)
// Man page interfaces(5) declares that interface definition
// should consist of the key word "iface" followed by interface
// name, and method at fourth field.
// Man page interfaces(5) declares that interface definition should
// consist of the key word "iface" followed by interface name, and
// method at fourth field.
if fieldsNum >= 4 &&
fields[0] == "iface" && fields[1] == string(n) && fields[3] == "static" {
return nil, false, nil
@ -78,10 +95,10 @@ func (n interfaceName) ifacesStaticConfig(r io.Reader) (sub []string, cont bool,
}
func ifaceHasStaticIP(ifaceName string) (has bool, err error) {
// TODO(a.garipov): Currently, this function returns the first
// definitive result. So if /etc/dhcpcd.conf has a static IP while
// /etc/network/interfaces doesn't, it will return true. Perhaps this
// is not the most desirable behavior.
// TODO(a.garipov): Currently, this function returns the first definitive
// result. So if /etc/dhcpcd.conf has and /etc/network/interfaces has no
// static IP configuration, it will return true. Perhaps this is not the
// most desirable behavior.
iface := interfaceName(ifaceName)
@ -90,17 +107,15 @@ func ifaceHasStaticIP(ifaceName string) (has bool, err error) {
filename string
}{{
FileWalker: iface.dhcpcdStaticConfig,
filename: "etc/dhcpcd.conf",
filename: dhcpcdConf,
}, {
FileWalker: iface.ifacesStaticConfig,
filename: "etc/network/interfaces",
}} {
has, err = pair.Walk(aghos.RootDirFS(), pair.filename)
has, err = pair.Walk(rootDirFS, pair.filename)
if err != nil {
return false, err
}
if has {
} else if has {
return true, nil
}
}
@ -108,14 +123,6 @@ func ifaceHasStaticIP(ifaceName string) (has bool, err error) {
return false, ErrNoStaticIPInfo
}
func canBindPrivilegedPorts() (can bool, err error) {
cnbs, err := unix.PrctlRetInt(unix.PR_CAP_AMBIENT, unix.PR_CAP_AMBIENT_IS_SET, unix.CAP_NET_BIND_SERVICE, 0, 0)
// Don't check the error because it's always nil on Linux.
adm, _ := aghos.HaveAdminRights()
return cnbs == 1 || adm, err
}
// findIfaceLine scans s until it finds the line that declares an interface with
// the given name. If findIfaceLine can't find the line, it returns false.
func findIfaceLine(s *bufio.Scanner, name string) (ok bool) {
@ -131,23 +138,23 @@ func findIfaceLine(s *bufio.Scanner, name string) (ok bool) {
}
// ifaceSetStaticIP configures the system to retain its current IP on the
// interface through dhcpdc.conf.
// interface through dhcpcd.conf.
func ifaceSetStaticIP(ifaceName string) (err error) {
ipNet := GetSubnet(ifaceName)
if ipNet.IP == nil {
return errors.Error("can't get IP address")
}
gatewayIP := GatewayIP(ifaceName)
add := dhcpcdConfIface(ifaceName, ipNet, gatewayIP, ipNet.IP)
body, err := os.ReadFile("/etc/dhcpcd.conf")
body, err := os.ReadFile(dhcpcdConf)
if err != nil && !errors.Is(err, os.ErrNotExist) {
return err
}
gatewayIP := GatewayIP(ifaceName)
add := dhcpcdConfIface(ifaceName, ipNet, gatewayIP)
body = append(body, []byte(add)...)
err = maybe.WriteFile("/etc/dhcpcd.conf", body, 0o644)
err = maybe.WriteFile(dhcpcdConf, body, 0o644)
if err != nil {
return fmt.Errorf("writing conf: %w", err)
}
@ -157,22 +164,24 @@ func ifaceSetStaticIP(ifaceName string) (err error) {
// dhcpcdConfIface returns configuration lines for the dhcpdc.conf files that
// configure the interface to have a static IP.
func dhcpcdConfIface(ifaceName string, ipNet *net.IPNet, gatewayIP, dnsIP net.IP) (conf string) {
var body []byte
add := fmt.Sprintf(
"\n# %[1]s added by AdGuard Home.\ninterface %[1]s\nstatic ip_address=%s\n",
func dhcpcdConfIface(ifaceName string, ipNet *net.IPNet, gwIP net.IP) (conf string) {
b := &strings.Builder{}
stringutil.WriteToBuilder(
b,
"\n# ",
ifaceName,
ipNet)
body = append(body, []byte(add)...)
" added by AdGuard Home.\ninterface ",
ifaceName,
"\nstatic ip_address=",
ipNet.String(),
"\n",
)
if gatewayIP != nil {
add = fmt.Sprintf("static routers=%s\n", gatewayIP)
body = append(body, []byte(add)...)
if gwIP != nil {
stringutil.WriteToBuilder(b, "static routers=", gwIP.String(), "\n")
}
add = fmt.Sprintf("static domain_name_servers=%s\n\n", dnsIP)
body = append(body, []byte(add)...)
stringutil.WriteToBuilder(b, "static domain_name_servers=", ipNet.IP.String(), "\n\n")
return string(body)
return b.String()
}

186
internal/aghnet/net_linux_test.go
View file

@ -4,152 +4,124 @@
package aghnet
import (
"bytes"
"net"
"io/fs"
"testing"
"testing/fstest"
"github.com/AdguardTeam/golibs/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestDHCPCDStaticConfig(t *testing.T) {
const iface interfaceName = `wlan0`
func TestHasStaticIP(t *testing.T) {
const ifaceName = "wlan0"
const (
dhcpcd = "etc/dhcpcd.conf"
netifaces = "etc/network/interfaces"
)
testCases := []struct {
rootFsys fs.FS
name string
data []byte
wantCont bool
wantHas assert.BoolAssertionFunc
wantErrMsg string
}{{
name: "has_not",
data: []byte(`#comment` + nl +
rootFsys: fstest.MapFS{
dhcpcd: &fstest.MapFile{
Data: []byte(`#comment` + nl +
`# comment` + nl +
`interface eth0` + nl +
`static ip_address=192.168.0.1/24` + nl +
`# interface ` + iface + nl +
`# interface ` + ifaceName + nl +
`static ip_address=192.168.1.1/24` + nl +
`# comment` + nl,
),
wantCont: true,
},
},
name: "dhcpcd_has_not",
wantHas: assert.False,
wantErrMsg: `no information about static ip`,
}, {
name: "has",
data: []byte(`#comment` + nl +
rootFsys: fstest.MapFS{
dhcpcd: &fstest.MapFile{
Data: []byte(`#comment` + nl +
`# comment` + nl +
`interface eth0` + nl +
`interface ` + ifaceName + nl +
`static ip_address=192.168.0.1/24` + nl +
`# interface ` + iface + nl +
`# interface ` + ifaceName + nl +
`static ip_address=192.168.1.1/24` + nl +
`# comment` + nl +
`interface ` + iface + nl +
`# comment` + nl +
`static ip_address=192.168.2.1/24` + nl,
`# comment` + nl,
),
wantCont: false,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
r := bytes.NewReader(tc.data)
_, cont, err := iface.dhcpcdStaticConfig(r)
require.NoError(t, err)
assert.Equal(t, tc.wantCont, cont)
})
}
}
func TestIfacesStaticConfig(t *testing.T) {
const iface interfaceName = `enp0s3`
testCases := []struct {
name string
data []byte
wantCont bool
wantPatterns []string
}{{
name: "has_not",
data: []byte(`allow-hotplug ` + iface + nl +
},
},
name: "dhcpcd_has",
wantHas: assert.True,
wantErrMsg: ``,
}, {
rootFsys: fstest.MapFS{
netifaces: &fstest.MapFile{
Data: []byte(`allow-hotplug ` + ifaceName + nl +
`#iface enp0s3 inet static` + nl +
`# address 192.168.0.200` + nl +
`# netmask 255.255.255.0` + nl +
`# gateway 192.168.0.1` + nl +
`iface ` + iface + ` inet dhcp` + nl,
`iface ` + ifaceName + ` inet dhcp` + nl,
),
wantCont: true,
wantPatterns: []string{},
},
},
name: "netifaces_has_not",
wantHas: assert.False,
wantErrMsg: `no information about static ip`,
}, {
name: "has",
data: []byte(`allow-hotplug ` + iface + nl +
`iface ` + iface + ` inet static` + nl +
rootFsys: fstest.MapFS{
netifaces: &fstest.MapFile{
Data: []byte(`allow-hotplug ` + ifaceName + nl +
`iface ` + ifaceName + ` inet static` + nl +
` address 192.168.0.200` + nl +
` netmask 255.255.255.0` + nl +
` gateway 192.168.0.1` + nl +
`#iface ` + iface + ` inet dhcp` + nl,
`#iface ` + ifaceName + ` inet dhcp` + nl,
),
wantCont: false,
wantPatterns: []string{},
},
},
name: "netifaces_has",
wantHas: assert.True,
wantErrMsg: ``,
}, {
name: "return_patterns",
data: []byte(`source hello` + nl +
`source world` + nl +
`#iface ` + iface + ` inet static` + nl,
rootFsys: fstest.MapFS{
netifaces: &fstest.MapFile{
Data: []byte(`source hello` + nl +
`#iface ` + ifaceName + ` inet static` + nl,
),
wantCont: true,
wantPatterns: []string{"hello", "world"},
},
"hello": &fstest.MapFile{
Data: []byte(`iface ` + ifaceName + ` inet static` + nl),
},
},
name: "netifaces_another_file",
wantHas: assert.True,
wantErrMsg: ``,
}, {
// This one tests if the first found valid interface prevents
// checking files under the `source` directive.
name: "ignore_patterns",
data: []byte(`source hello` + nl +
`source world` + nl +
`iface ` + iface + ` inet static` + nl,
rootFsys: fstest.MapFS{
netifaces: &fstest.MapFile{
Data: []byte(`source hello` + nl +
`iface ` + ifaceName + ` inet static` + nl,
),
wantCont: false,
wantPatterns: []string{},
},
},
name: "netifaces_ignore_another",
wantHas: assert.True,
wantErrMsg: ``,
}}
for _, tc := range testCases {
r := bytes.NewReader(tc.data)
t.Run(tc.name, func(t *testing.T) {
patterns, has, err := iface.ifacesStaticConfig(r)
require.NoError(t, err)
substRootDirFS(t, tc.rootFsys)
assert.Equal(t, tc.wantCont, has)
assert.ElementsMatch(t, tc.wantPatterns, patterns)
})
}
}
func TestSetStaticIPdhcpcdConf(t *testing.T) {
testCases := []struct {
name string
dhcpcdConf string
routers net.IP
}{{
name: "with_gateway",
dhcpcdConf: nl + `# wlan0 added by AdGuard Home.` + nl +
`interface wlan0` + nl +
`static ip_address=192.168.0.2/24` + nl +
`static routers=192.168.0.1` + nl +
`static domain_name_servers=192.168.0.2` + nl + nl,
routers: net.IP{192, 168, 0, 1},
}, {
name: "without_gateway",
dhcpcdConf: nl + `# wlan0 added by AdGuard Home.` + nl +
`interface wlan0` + nl +
`static ip_address=192.168.0.2/24` + nl +
`static domain_name_servers=192.168.0.2` + nl + nl,
routers: nil,
}}
ipNet := &net.IPNet{
IP: net.IP{192, 168, 0, 2},
Mask: net.IPMask{255, 255, 255, 0},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
s := dhcpcdConfIface("wlan0", ipNet, tc.routers, net.IP{192, 168, 0, 2})
assert.Equal(t, tc.dhcpcdConf, s)
has, err := IfaceHasStaticIP(ifaceName)
testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
tc.wantHas(t, has)
})
}
}

2
internal/aghnet/net_openbsd.go
View file

@ -16,7 +16,7 @@ import (
func ifaceHasStaticIP(ifaceName string) (ok bool, err error) {
filename := fmt.Sprintf("etc/hostname.%s", ifaceName)
return aghos.FileWalker(hostnameIfStaticConfig).Walk(aghos.RootDirFS(), filename)
return aghos.FileWalker(hostnameIfStaticConfig).Walk(rootDirFS, filename)
}
// hostnameIfStaticConfig checks if the interface is configured by

56
internal/aghnet/net_openbsd_test.go
View file

@ -4,49 +4,69 @@
package aghnet
import (
"strings"
"fmt"
"io/fs"
"testing"
"testing/fstest"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestHostnameIfStaticConfig(t *testing.T) {
const nl = "\n"
func TestIfaceHasStaticIP(t *testing.T) {
const ifaceName = "em0"
confFile := fmt.Sprintf("etc/hostname.%s", ifaceName)
testCases := []struct {
name string
rcconfData string
wantHas bool
rootFsys fs.FS
wantHas assert.BoolAssertionFunc
}{{
name: "simple",
rcconfData: `inet 127.0.0.253` + nl,
wantHas: true,
rootFsys: fstest.MapFS{
confFile: &fstest.MapFile{
Data: []byte(`inet 127.0.0.253` + nl),
},
},
wantHas: assert.True,
}, {
name: "case_sensitiveness",
rcconfData: `InEt 127.0.0.253` + nl,
wantHas: false,
rootFsys: fstest.MapFS{
confFile: &fstest.MapFile{
Data: []byte(`InEt 127.0.0.253` + nl),
},
},
wantHas: assert.False,
}, {
name: "comments_and_trash",
rcconfData: `# comment 1` + nl +
`` + nl +
rootFsys: fstest.MapFS{
confFile: &fstest.MapFile{
Data: []byte(`# comment 1` + nl + nl +
`# inet 127.0.0.253` + nl +
`inet` + nl,
wantHas: false,
),
},
},
wantHas: assert.False,
}, {
name: "incorrect_config",
rcconfData: `inet6 127.0.0.253` + nl +
`inet 256.256.256.256` + nl,
wantHas: false,
rootFsys: fstest.MapFS{
confFile: &fstest.MapFile{
Data: []byte(`inet6 127.0.0.253` + nl + `inet 256.256.256.256` + nl),
},
},
wantHas: assert.False,
}}
for _, tc := range testCases {
r := strings.NewReader(tc.rcconfData)
t.Run(tc.name, func(t *testing.T) {
_, has, err := hostnameIfStaticConfig(r)
substRootDirFS(t, tc.rootFsys)
has, err := IfaceHasStaticIP(ifaceName)
require.NoError(t, err)
assert.Equal(t, tc.wantHas, has)
tc.wantHas(t, has)
})
}
}

216
internal/aghnet/net_test.go
View file

@ -1,12 +1,17 @@
package aghnet
import (
"bytes"
"encoding/json"
"fmt"
"io/fs"
"net"
"os"
"strings"
"testing"
"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/netutil"
"github.com/AdguardTeam/golibs/testutil"
"github.com/stretchr/testify/assert"
@ -20,6 +25,113 @@ func TestMain(m *testing.M) {
// testdata is the filesystem containing data for testing the package.
var testdata fs.FS = os.DirFS("./testdata")
// substRootDirFS replaces the aghos.RootDirFS function used throughout the
// package with fsys for tests ran under t.
func substRootDirFS(t testing.TB, fsys fs.FS) {
t.Helper()
prev := rootDirFS
t.Cleanup(func() { rootDirFS = prev })
rootDirFS = fsys
}
// RunCmdFunc is the signature of aghos.RunCommand function.
type RunCmdFunc func(cmd string, args ...string) (code int, out []byte, err error)
// substShell replaces the the aghos.RunCommand function used throughout the
// package with rc for tests ran under t.
func substShell(t testing.TB, rc RunCmdFunc) {
t.Helper()
prev := aghosRunCommand
t.Cleanup(func() { aghosRunCommand = prev })
aghosRunCommand = rc
}
// mapShell is a substitution of aghos.RunCommand that maps the command to it's
// execution result. It's only needed to simplify testing.
//
// TODO(e.burkov): Perhaps put all the shell interactions behind an interface.
type mapShell map[string]struct {
err error
out string
code int
}
// theOnlyCmd returns mapShell that only handles a single command and arguments
// combination from cmd.
func theOnlyCmd(cmd string, code int, out string, err error) (s mapShell) {
return mapShell{cmd: {code: code, out: out, err: err}}
}
// RunCmd is a RunCmdFunc handled by s.
func (s mapShell) RunCmd(cmd string, args ...string) (code int, out []byte, err error) {
key := strings.Join(append([]string{cmd}, args...), " ")
ret, ok := s[key]
if !ok {
return 0, nil, fmt.Errorf("unexpected shell command %q", key)
}
return ret.code, []byte(ret.out), ret.err
}
// ifaceAddrsFunc is the signature of net.InterfaceAddrs function.
type ifaceAddrsFunc func() (ifaces []net.Addr, err error)
// substNetInterfaceAddrs replaces the the net.InterfaceAddrs function used
// throughout the package with f for tests ran under t.
func substNetInterfaceAddrs(t *testing.T, f ifaceAddrsFunc) {
t.Helper()
prev := netInterfaceAddrs
t.Cleanup(func() { netInterfaceAddrs = prev })
netInterfaceAddrs = f
}
func TestGatewayIP(t *testing.T) {
const ifaceName = "ifaceName"
const cmd = "ip route show dev " + ifaceName
testCases := []struct {
name string
shell mapShell
want net.IP
}{{
name: "success_v4",
shell: theOnlyCmd(cmd, 0, `default via 1.2.3.4 onlink`, nil),
want: net.IP{1, 2, 3, 4}.To16(),
}, {
name: "success_v6",
shell: theOnlyCmd(cmd, 0, `default via ::ffff onlink`, nil),
want: net.IP{
0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0xFF, 0xFF,
},
}, {
name: "bad_output",
shell: theOnlyCmd(cmd, 0, `non-default via 1.2.3.4 onlink`, nil),
want: nil,
}, {
name: "err_runcmd",
shell: theOnlyCmd(cmd, 0, "", errors.Error("can't run command")),
want: nil,
}, {
name: "bad_code",
shell: theOnlyCmd(cmd, 1, "", nil),
want: nil,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
substShell(t, tc.shell.RunCmd)
assert.Equal(t, tc.want, GatewayIP(ifaceName))
})
}
}
func TestGetInterfaceByIP(t *testing.T) {
ifaces, err := GetValidNetInterfacesForWeb()
require.NoError(t, err)
@ -130,3 +242,107 @@ func TestCheckPort(t *testing.T) {
assert.NoError(t, err)
})
}
func TestCollectAllIfacesAddrs(t *testing.T) {
testCases := []struct {
name string
wantErrMsg string
addrs []net.Addr
wantAddrs []string
}{{
name: "success",
wantErrMsg: ``,
addrs: []net.Addr{&net.IPNet{
IP: net.IP{1, 2, 3, 4},
Mask: net.CIDRMask(24, netutil.IPv4BitLen),
}, &net.IPNet{
IP: net.IP{4, 3, 2, 1},
Mask: net.CIDRMask(16, netutil.IPv4BitLen),
}},
wantAddrs: []string{"1.2.3.4", "4.3.2.1"},
}, {
name: "not_cidr",
wantErrMsg: `parsing cidr: invalid CIDR address: 1.2.3.4`,
addrs: []net.Addr{&net.IPAddr{
IP: net.IP{1, 2, 3, 4},
}},
wantAddrs: nil,
}, {
name: "empty",
wantErrMsg: ``,
addrs: []net.Addr{},
wantAddrs: nil,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
substNetInterfaceAddrs(t, func() ([]net.Addr, error) { return tc.addrs, nil })
addrs, err := CollectAllIfacesAddrs()
testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
assert.Equal(t, tc.wantAddrs, addrs)
})
}
t.Run("internal_error", func(t *testing.T) {
const errAddrs errors.Error = "can't get addresses"
const wantErrMsg string = `getting interfaces addresses: ` + string(errAddrs)
substNetInterfaceAddrs(t, func() ([]net.Addr, error) { return nil, errAddrs })
_, err := CollectAllIfacesAddrs()
testutil.AssertErrorMsg(t, wantErrMsg, err)
})
}
func TestIsAddrInUse(t *testing.T) {
t.Run("addr_in_use", func(t *testing.T) {
l, err := net.Listen("tcp", "0.0.0.0:0")
require.NoError(t, err)
testutil.CleanupAndRequireSuccess(t, l.Close)
_, err = net.Listen(l.Addr().Network(), l.Addr().String())
assert.True(t, IsAddrInUse(err))
})
t.Run("another", func(t *testing.T) {
const anotherErr errors.Error = "not addr in use"
assert.False(t, IsAddrInUse(anotherErr))
})
}
func TestNetInterface_MarshalJSON(t *testing.T) {
const want = `{` +
`"hardware_address":"aa:bb:cc:dd:ee:ff",` +
`"flags":"up|multicast",` +
`"ip_addresses":["1.2.3.4","aaaa::1"],` +
`"name":"iface0",` +
`"mtu":1500` +
`}` + "\n"
ip4, ip6 := net.IP{1, 2, 3, 4}, net.IP{0xAA, 0xAA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
mask4, mask6 := net.CIDRMask(24, netutil.IPv4BitLen), net.CIDRMask(8, netutil.IPv6BitLen)
iface := &NetInterface{
Addresses: []net.IP{ip4, ip6},
Subnets: []*net.IPNet{{
IP: ip4.Mask(mask4),
Mask: mask4,
}, {
IP: ip6.Mask(mask6),
Mask: mask6,
}},
Name: "iface0",
HardwareAddr: net.HardwareAddr{0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF},
Flags: net.FlagUp | net.FlagMulticast,
MTU: 1500,
}
b := &bytes.Buffer{}
err := json.NewEncoder(b).Encode(iface)
require.NoError(t, err)
assert.Equal(t, want, b.String())
}

40
internal/aghnet/systemresolvers.go
View file

@ -1,11 +1,5 @@
package aghnet
import (
"time"
"github.com/AdguardTeam/golibs/log"
)
// DefaultRefreshIvl is the default period of time between refreshing cached
// addresses.
// const DefaultRefreshIvl = 5 * time.Minute
@ -16,39 +10,21 @@ type HostGenFunc func() (host string)
// SystemResolvers helps to work with local resolvers' addresses provided by OS.
type SystemResolvers interface {
// Get returns the slice of local resolvers' addresses. It should be
// safe for concurrent use.
// Get returns the slice of local resolvers' addresses. It must be safe for
// concurrent use.
Get() (rs []string)
// refresh refreshes the local resolvers' addresses cache. It should be
// safe for concurrent use.
// refresh refreshes the local resolvers' addresses cache. It must be safe
// for concurrent use.
refresh() (err error)
}
// refreshWithTicker refreshes the cache of sr after each tick form tickCh.
func refreshWithTicker(sr SystemResolvers, tickCh <-chan time.Time) {
defer log.OnPanic("systemResolvers")
// TODO(e.burkov): Implement a functionality to stop ticker.
for range tickCh {
err := sr.refresh()
if err != nil {
log.Error("systemResolvers: error in refreshing goroutine: %s", err)
continue
}
log.Debug("systemResolvers: local addresses cache is refreshed")
}
}
// NewSystemResolvers returns a SystemResolvers with the cache refresh rate
// defined by refreshIvl. It disables auto-resfreshing if refreshIvl is 0. If
// nil is passed for hostGenFunc, the default generator will be used.
func NewSystemResolvers(
refreshIvl time.Duration,
hostGenFunc HostGenFunc,
) (sr SystemResolvers, err error) {
sr = newSystemResolvers(refreshIvl, hostGenFunc)
sr = newSystemResolvers(hostGenFunc)
// Fill cache.
err = sr.refresh()
@ -56,11 +32,5 @@ func NewSystemResolvers(
return nil, err
}
if refreshIvl > 0 {
ticker := time.NewTicker(refreshIvl)
go refreshWithTicker(sr, ticker.C)
}
return sr, nil
}

21
internal/aghnet/systemresolvers_others.go
View file

@ -24,12 +24,15 @@ func defaultHostGen() (host string) {
// systemResolvers is a default implementation of SystemResolvers interface.
type systemResolvers struct {
resolver *net.Resolver
hostGenFunc HostGenFunc
// addrsLock protects addrs.
addrsLock sync.RWMutex
// addrs is the set that contains cached local resolvers' addresses.
addrs *stringutil.Set
addrsLock sync.RWMutex
// resolver is used to fetch the resolvers' addresses.
resolver *net.Resolver
// hostGenFunc generates hosts to resolve.
hostGenFunc HostGenFunc
}
const (
@ -44,6 +47,7 @@ const (
errUnexpectedHostFormat errors.Error = "unexpected host format"
)
// refresh implements the SystemResolvers interface for *systemResolvers.
func (sr *systemResolvers) refresh() (err error) {
defer func() { err = errors.Annotate(err, "systemResolvers: %w") }()
@ -56,7 +60,7 @@ func (sr *systemResolvers) refresh() (err error) {
return err
}
func newSystemResolvers(refreshIvl time.Duration, hostGenFunc HostGenFunc) (sr SystemResolvers) {
func newSystemResolvers(hostGenFunc HostGenFunc) (sr SystemResolvers) {
if hostGenFunc == nil {
hostGenFunc = defaultHostGen
}
@ -76,19 +80,18 @@ func newSystemResolvers(refreshIvl time.Duration, hostGenFunc HostGenFunc) (sr S
func validateDialedHost(host string) (err error) {
defer func() { err = errors.Annotate(err, "parsing %q: %w", host) }()
var ipStr string
parts := strings.Split(host, "%")
switch len(parts) {
case 1:
ipStr = host
// host
case 2:
// Remove the zone and check the IP address part.
ipStr = parts[0]
host = parts[0]
default:
return errUnexpectedHostFormat
}
if net.ParseIP(ipStr) == nil {
if _, err = netutil.ParseIP(host); err != nil {
return errBadAddrPassed
}

21
internal/aghnet/systemresolvers_others_test.go
View file

@ -6,37 +6,32 @@ package aghnet
import (
"context"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func createTestSystemResolversImp(
func createTestSystemResolversImpl(
t *testing.T,
refreshDur time.Duration,
hostGenFunc HostGenFunc,
) (imp *systemResolvers) {
t.Helper()
sr := createTestSystemResolvers(t, refreshDur, hostGenFunc)
sr := createTestSystemResolvers(t, hostGenFunc)
require.IsType(t, (*systemResolvers)(nil), sr)
var ok bool
imp, ok = sr.(*systemResolvers)
require.True(t, ok)
return imp
return sr.(*systemResolvers)
}
func TestSystemResolvers_Refresh(t *testing.T) {
t.Run("expected_error", func(t *testing.T) {
sr := createTestSystemResolvers(t, 0, nil)
sr := createTestSystemResolvers(t, nil)
assert.NoError(t, sr.refresh())
})
t.Run("unexpected_error", func(t *testing.T) {
_, err := NewSystemResolvers(0, func() string {
_, err := NewSystemResolvers(func() string {
return "127.0.0.1::123"
})
assert.Error(t, err)
@ -44,7 +39,7 @@ func TestSystemResolvers_Refresh(t *testing.T) {
}
func TestSystemResolvers_DialFunc(t *testing.T) {
imp := createTestSystemResolversImp(t, 0, nil)
imp := createTestSystemResolversImpl(t, nil)
testCases := []struct {
want error
@ -52,7 +47,7 @@ func TestSystemResolvers_DialFunc(t *testing.T) {
address string
}{{
want: errFakeDial,
name: "valid",
name: "valid_ipv4",
address: "127.0.0.1",
}, {
want: errFakeDial,

14
internal/aghnet/systemresolvers_test.go
View file

@ -2,7 +2,6 @@ package aghnet
import (
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
@ -10,13 +9,12 @@ import (
func createTestSystemResolvers(
t *testing.T,
refreshDur time.Duration,
hostGenFunc HostGenFunc,
) (sr SystemResolvers) {
t.Helper()
var err error
sr, err = NewSystemResolvers(refreshDur, hostGenFunc)
sr, err = NewSystemResolvers(hostGenFunc)
require.NoError(t, err)
require.NotNil(t, sr)
@ -24,8 +22,14 @@ func createTestSystemResolvers(
}
func TestSystemResolvers_Get(t *testing.T) {
sr := createTestSystemResolvers(t, 0, nil)
assert.NotEmpty(t, sr.Get())
sr := createTestSystemResolvers(t, nil)
var rs []string
require.NotPanics(t, func() {
rs = sr.Get()
})
assert.NotEmpty(t, rs)
}
// TODO(e.burkov): Write tests for refreshWithTicker.

3
internal/aghnet/systemresolvers_windows.go
View file

@ -11,7 +11,6 @@ import (
"os/exec"
"strings"
"sync"
"time"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
@ -27,7 +26,7 @@ type systemResolvers struct {
addrsLock sync.RWMutex
}
func newSystemResolvers(refreshIvl time.Duration, _ HostGenFunc) (sr SystemResolvers) {
func newSystemResolvers(_ HostGenFunc) (sr SystemResolvers) {
return &systemResolvers{}
}

6
internal/aghnet/testdata/proc_net_arp vendored Normal file
View file

@ -0,0 +1,6 @@
IP address HW type Flags HW address Mask Device
192.168.1.2 0x1 0x2 ab:cd:ef:ab:cd:ef * wan
::ffff:ffff 0x1 0x0 ef:cd:ab:ef:cd:ab * br-lan
0.0.0.0 0x0 0x0 00:00:00:00:00:00 * unspec
1.2.3.4.5 0x1 0x2 aa:bb:cc:dd:ee:ff * wan
1.2.3.4 0x1 0x2 12:34:56:78:910 * wan

29
internal/aghos/os.go
View file

@ -52,24 +52,27 @@ func HaveAdminRights() (bool, error) {
return haveAdminRights()
}
// MaxCmdOutputSize is the maximum length of performed shell command output.
const MaxCmdOutputSize = 2 * 1024
// MaxCmdOutputSize is the maximum length of performed shell command output in
// bytes.
const MaxCmdOutputSize = 64 * 1024
// RunCommand runs shell command.
func RunCommand(command string, arguments ...string) (int, string, error) {
func RunCommand(command string, arguments ...string) (code int, output []byte, err error) {
cmd := exec.Command(command, arguments...)
out, err := cmd.Output()
if len(out) > MaxCmdOutputSize {
out = out[:MaxCmdOutputSize]
}
if errors.As(err, new(*exec.ExitError)) {
return cmd.ProcessState.ExitCode(), string(out), nil
} else if err != nil {
return 1, "", fmt.Errorf("exec.Command(%s) failed: %w: %s", command, err, string(out))
if err != nil {
if eerr := new(exec.ExitError); errors.As(err, &eerr) {
return eerr.ExitCode(), eerr.Stderr, nil
}
return cmd.ProcessState.ExitCode(), string(out), nil
return 1, nil, fmt.Errorf("command %q failed: %w: %s", command, err, out)
}
return cmd.ProcessState.ExitCode(), out, nil
}
// PIDByCommand searches for process named command and returns its PID ignoring
@ -172,3 +175,13 @@ func RootDirFS() (fsys fs.FS) {
// behavior is undocumented but it currently works.
return os.DirFS("")
}
// NotifyShutdownSignal notifies c on receiving shutdown signals.
func NotifyShutdownSignal(c chan<- os.Signal) {
notifyShutdownSignal(c)
}
// IsShutdownSignal returns true if sig is a shutdown signal.
func IsShutdownSignal(sig os.Signal) (ok bool) {
return isShutdownSignal(sig)
}

27
internal/aghos/os_unix.go Normal file
View file

@ -0,0 +1,27 @@
//go:build darwin || freebsd || linux || openbsd
// +build darwin freebsd linux openbsd
package aghos
import (
"os"
"os/signal"
"golang.org/x/sys/unix"
)
func notifyShutdownSignal(c chan<- os.Signal) {
signal.Notify(c, unix.SIGINT, unix.SIGQUIT, unix.SIGTERM)
}
func isShutdownSignal(sig os.Signal) (ok bool) {
switch sig {
case
unix.SIGINT,
unix.SIGQUIT,
unix.SIGTERM:
return true
default:
return false
}
}

21
internal/aghos/os_windows.go
View file

@ -4,6 +4,10 @@
package aghos
import (
"os"
"os/signal"
"syscall"
"golang.org/x/sys/windows"
)
@ -35,3 +39,20 @@ func haveAdminRights() (bool, error) {
func isOpenWrt() (ok bool) {
return false
}
func notifyShutdownSignal(c chan<- os.Signal) {
// syscall.SIGTERM is processed automatically. See go doc os/signal,
// section Windows.
signal.Notify(c, os.Interrupt)
}
func isShutdownSignal(sig os.Signal) (ok bool) {
switch sig {
case
os.Interrupt,
syscall.SIGTERM:
return true
default:
return false
}
}

1
internal/dnsforward/dns.go
View file

@ -135,7 +135,6 @@ func (s *Server) processRecursion(dctx *dnsContext) (rc resultCode) {
pctx.Res = s.genNXDomain(pctx.Req)
return resultCodeFinish
}
return resultCodeSuccess

2
internal/dnsforward/dnsforward.go
View file

@ -173,7 +173,7 @@ func NewServer(p DNSCreateParams) (s *Server, err error) {
// TODO(e.burkov): Enable the refresher after the actual implementation
// passes the public testing.
s.sysResolvers, err = aghnet.NewSystemResolvers(0, nil)
s.sysResolvers, err = aghnet.NewSystemResolvers(nil)
if err != nil {
return nil, fmt.Errorf("initializing system resolvers: %w", err)
}

14
internal/dnsforward/recursiondetector_test.go
View file

@ -83,7 +83,7 @@ func TestRecursionDetector_Suspect(t *testing.T) {
testCases := []struct {
name string
msg dns.Msg
want bool
want int
}{{
name: "simple",
msg: dns.Msg{
@ -95,24 +95,18 @@ func TestRecursionDetector_Suspect(t *testing.T) {
Qtype: dns.TypeA,
}},
},
want: true,
want: 1,
}, {
name: "unencumbered",
msg: dns.Msg{},
want: false,
want: 0,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Cleanup(rd.clear)
rd.add(tc.msg)
if tc.want {
assert.Equal(t, 1, rd.recentRequests.Stats().Count)
} else {
assert.Zero(t, rd.recentRequests.Stats().Count)
}
assert.Equal(t, tc.want, rd.recentRequests.Stats().Count)
})
}
}

37
internal/home/home.go
View file

@ -518,44 +518,31 @@ func StartMods() error {
func checkPermissions() {
log.Info("Checking if AdGuard Home has necessary permissions")
if runtime.GOOS == "windows" {
// On Windows we need to have admin rights to run properly
admin, _ := aghos.HaveAdminRights()
if admin {
return
}
if ok, err := aghnet.CanBindPrivilegedPorts(); !ok || err != nil {
log.Fatal("This is the first launch of AdGuard Home. You must run it as Administrator.")
}
// We should check if AdGuard Home is able to bind to port 53
ok, err := aghnet.CanBindPort(53)
if ok {
log.Info("AdGuard Home can bind to port 53")
return
}
err := aghnet.CheckPort("tcp", net.IP{127, 0, 0, 1}, defaultPortDNS)
if err != nil {
if errors.Is(err, os.ErrPermission) {
msg := `Permission check failed.
log.Fatal(`Permission check failed.
AdGuard Home is not allowed to bind to privileged ports (for instance, port 53).
Please note, that this is crucial for a server to be able to use privileged ports.
You have two options:
1. Run AdGuard Home with root privileges
2. On Linux you can grant the CAP_NET_BIND_SERVICE capability:
https://github.com/AdguardTeam/AdGuardHome/wiki/Getting-Started#running-without-superuser`
log.Fatal(msg)
https://github.com/AdguardTeam/AdGuardHome/wiki/Getting-Started#running-without-superuser`)
}
msg := fmt.Sprintf(`AdGuard failed to bind to port 53 due to %v
log.Info(
"AdGuard failed to bind to port 53: %s\n\n"+
"Please note, that this is crucial for a DNS server to be able to use that port.",
err,
)
}
Please note, that this is crucial for a DNS server to be able to use that port.`, err)
log.Info(msg)
log.Info("AdGuard Home can bind to port 53")
}
// Write PID to a file

11
internal/home/rdns.go
View file

@ -16,18 +16,17 @@ type RDNS struct {
exchanger dnsforward.RDNSExchanger
clients *clientsContainer
// usePrivate is used to store the state of current private RDNS
// resolving settings and to react to it's changes.
// usePrivate is used to store the state of current private RDNS resolving
// settings and to react to it's changes.
usePrivate uint32
// ipCh used to pass client's IP to rDNS workerLoop.
ipCh chan net.IP
// ipCache caches the IP addresses to be resolved by rDNS. The resolved
// address stays here while it's inside clients. After leaving clients
// the address will be resolved once again. If the address couldn't be
// resolved, cache prevents further attempts to resolve it for some
// time.
// address stays here while it's inside clients. After leaving clients the
// address will be resolved once again. If the address couldn't be
// resolved, cache prevents further attempts to resolve it for some time.
ipCache cache.Cache
}

5
internal/home/service_openbsd.go
View file

@ -314,12 +314,13 @@ func (s *openbsdRunComService) runCom(cmd string) (out string, err error) {
// TODO(e.burkov): It's possible that os.ErrNotExist is caused by
// something different than the service script's non-existence. Keep it
// in mind, when replace the aghos.RunCommand.
_, out, err = aghos.RunCommand(scriptPath, cmd)
var outData []byte
_, outData, err = aghos.RunCommand(scriptPath, cmd)
if errors.Is(err, os.ErrNotExist) {
return "", service.ErrNotInstalled
}
return out, err
return string(outData), err
}
// Status implements service.Service interface for *openbsdRunComService.