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Pull request: 3225 bsd dhcp

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Merge in DNS/adguard-home from 3225-bsd-dhcp to master

Closes #3225.
Closes #3417.

Squashed commit of the following:

commit e7ea691824c7ebc8cafd8c9e206679346cbc8592
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Aug 12 17:02:02 2021 +0300

    all: imp code, docs

commit 5b598fc18a9b69a0256569f4c691bb6a2193dfbd
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Aug 12 16:28:12 2021 +0300

    all: mv logic, imp code, docs, log changes

commit e3e1577a668fe3e5c61d075c390e4bd7268181ba
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Aug 12 14:15:10 2021 +0300

    dhcpd: imp checkother

commit 3cc8b058195c30a7ef0b7741ee8463270d9e47ff
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Aug 11 13:20:18 2021 +0300

    all: imp bsd support
This commit is contained in:
Eugene Burkov 2021-08-12 17:33:53 +03:00
parent 00f2927663
commit 506b459842
21 changed files with 522 additions and 272 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
CHANGELOG.md
View file

@ -27,7 +27,7 @@ and this project adheres to
- Settable timeouts for querying the upstream servers ([#2280]).
- Configuration file parameters to change group and user ID on startup on Unix
([#2763]).
- Experimental OpenBSD support for AMD64 and 64-bit ARM CPUs ([#2439]).
- Experimental OpenBSD support for AMD64 and 64-bit ARM CPUs ([#2439], [#3225]).
- Support for custom port in DNS-over-HTTPS profiles for Apple's devices
([#3172]).
- `darwin/arm64` support ([#2443]).
@ -64,6 +64,7 @@ and this project adheres to
### Fixed
- Discovering other DHCP servers on `darwin` and `freebsd` ([#3417]).
- Switching listening address to unspecified one when bound to a single
specified IPv4 address on Darwin (macOS) ([#2807]).
- Incomplete HTTP response for static IP address.
@ -112,6 +113,7 @@ and this project adheres to
[#3194]: https://github.com/AdguardTeam/AdGuardHome/issues/3194
[#3198]: https://github.com/AdguardTeam/AdGuardHome/issues/3198
[#3217]: https://github.com/AdguardTeam/AdGuardHome/issues/3217
[#3225]: https://github.com/AdguardTeam/AdGuardHome/issues/3225
[#3256]: https://github.com/AdguardTeam/AdGuardHome/issues/3256
[#3257]: https://github.com/AdguardTeam/AdGuardHome/issues/3257
[#3289]: https://github.com/AdguardTeam/AdGuardHome/issues/3289
@ -119,6 +121,7 @@ and this project adheres to
[#3343]: https://github.com/AdguardTeam/AdGuardHome/issues/3343
[#3351]: https://github.com/AdguardTeam/AdGuardHome/issues/3351
[#3372]: https://github.com/AdguardTeam/AdGuardHome/issues/3372
[#3417]: https://github.com/AdguardTeam/AdGuardHome/issues/3417

6
internal/aghnet/dhcp.go Normal file
View file

@ -0,0 +1,6 @@
package aghnet
// CheckOtherDHCP tries to discover another DHCP server in the network.
func CheckOtherDHCP(ifaceName string) (ok4, ok6 bool, err4, err6 error) {
return checkOtherDHCP(ifaceName)
}

202
internal/dhcpd/checkother.go → internal/aghnet/dhcp_unix.go
View file

@ -1,95 +1,132 @@
//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
package dhcpd
package aghnet
import (
"bytes"
"fmt"
"net"
"os"
"runtime"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
"github.com/insomniacslk/dhcp/dhcpv4"
"github.com/insomniacslk/dhcp/dhcpv4/nclient4"
"github.com/insomniacslk/dhcp/dhcpv6"
"github.com/insomniacslk/dhcp/dhcpv6/nclient6"
"github.com/insomniacslk/dhcp/iana"
)
// CheckIfOtherDHCPServersPresentV4 sends a DHCP request to the specified network interface,
// and waits for a response for a period defined by defaultDiscoverTime
func CheckIfOtherDHCPServersPresentV4(ifaceName string) (ok bool, err error) {
// defaultDiscoverTime is the
const defaultDiscoverTime = 3 * time.Second
func checkOtherDHCP(ifaceName string) (ok4, ok6 bool, err4, err6 error) {
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
return false, fmt.Errorf("couldn't find interface by name %s: %w", ifaceName, err)
err = fmt.Errorf("couldn't find interface by name %s: %w", ifaceName, err)
err4, err6 = err, err
return false, false, err4, err6
}
ifaceIPNet, err := ifaceIPAddrs(iface, ipVersion4)
if err != nil {
return false, fmt.Errorf("getting ipv4 addrs for iface %s: %w", ifaceName, err)
}
if len(ifaceIPNet) == 0 {
return false, fmt.Errorf("interface %s has no ipv4 addresses", ifaceName)
ok4, err4 = checkOtherDHCPv4(iface)
ok6, err6 = checkOtherDHCPv6(iface)
return ok4, ok6, err4, err6
}
// ifaceIPv4Subnet returns the first suitable IPv4 subnetwork iface has.
func ifaceIPv4Subnet(iface *net.Interface) (subnet *net.IPNet, err error) {
var addrs []net.Addr
if addrs, err = iface.Addrs(); err != nil {
return nil, err
}
// TODO(a.garipov): Find out what this is about. Perhaps this
// information is outdated or at least incomplete.
if runtime.GOOS == "darwin" {
return false, aghos.Unsupported("CheckIfOtherDHCPServersPresentV4")
for _, a := range addrs {
switch a := a.(type) {
case *net.IPAddr:
subnet = &net.IPNet{
IP: a.IP,
Mask: a.IP.DefaultMask(),
}
case *net.IPNet:
subnet = a
default:
continue
}
if ip4 := subnet.IP.To4(); ip4 != nil {
subnet.IP = ip4
return subnet, nil
}
}
srcIP := ifaceIPNet[0]
src := netutil.JoinHostPort(srcIP.String(), 68)
dst := "255.255.255.255:67"
return nil, fmt.Errorf("interface %s has no ipv4 addresses", iface.Name)
}
hostname, _ := os.Hostname()
req, err := dhcpv4.NewDiscovery(iface.HardwareAddr)
if err != nil {
return false, fmt.Errorf("dhcpv4.NewDiscovery: %w", err)
}
req.Options.Update(dhcpv4.OptClientIdentifier(iface.HardwareAddr))
req.Options.Update(dhcpv4.OptHostName(hostname))
// resolve 0.0.0.0:68
udpAddr, err := net.ResolveUDPAddr("udp4", src)
if err != nil {
return false, fmt.Errorf("couldn't resolve UDP address %s: %w", src, err)
// checkOtherDHCPv4 sends a DHCP request to the specified network interface, and
// waits for a response for a period defined by defaultDiscoverTime.
func checkOtherDHCPv4(iface *net.Interface) (ok bool, err error) {
var subnet *net.IPNet
if subnet, err = ifaceIPv4Subnet(iface); err != nil {
return false, err
}
if !udpAddr.IP.To4().Equal(srcIP) {
return false, fmt.Errorf("resolved UDP address is not %s: %w", src, err)
}
// resolve 255.255.255.255:67
dstAddr, err := net.ResolveUDPAddr("udp4", dst)
if err != nil {
// Resolve broadcast addr.
dst := netutil.IPPort{
IP: BroadcastFromIPNet(subnet),
Port: 67,
}.String()
var dstAddr *net.UDPAddr
if dstAddr, err = net.ResolveUDPAddr("udp4", dst); err != nil {
return false, fmt.Errorf("couldn't resolve UDP address %s: %w", dst, err)
}
// bind to 0.0.0.0:68
log.Tracef("Listening to udp4 %+v", udpAddr)
c, err := nclient4.NewRawUDPConn(ifaceName, 68)
if err != nil {
return false, fmt.Errorf("couldn't listen on :68: %w", err)
}
if c != nil {
defer func() { err = errors.WithDeferred(err, c.Close()) }()
var hostname string
if hostname, err = os.Hostname(); err != nil {
return false, fmt.Errorf("couldn't get hostname: %w", err)
}
// send to 255.255.255.255:67
_, err = c.WriteTo(req.ToBytes(), dstAddr)
if err != nil {
return false, fmt.Errorf("couldn't send a packet to %s: %w", dst, err)
return discover4(iface, dstAddr, hostname)
}
func discover4(iface *net.Interface, dstAddr *net.UDPAddr, hostname string) (ok bool, err error) {
var req *dhcpv4.DHCPv4
if req, err = dhcpv4.NewDiscovery(iface.HardwareAddr); err != nil {
return false, fmt.Errorf("dhcpv4.NewDiscovery: %w", err)
}
req.Options.Update(dhcpv4.OptClientIdentifier(iface.HardwareAddr))
req.Options.Update(dhcpv4.OptHostName(hostname))
req.SetBroadcast()
// Bind to 0.0.0.0:68.
//
// On OpenBSD binding to the port 68 competes with dhclient's binding,
// so that all incoming packets are ignored and the discovering process
// is spoiled.
//
// It's also known that listening on the specified interface's address
// ignores broadcasted packets when reading.
var c net.PacketConn
if c, err = net.ListenPacket("udp4", ":68"); err != nil {
return false, fmt.Errorf("couldn't listen on :68: %w", err)
}
defer func() { err = errors.WithDeferred(err, c.Close()) }()
// Send to resolved broadcast.
if _, err = c.WriteTo(req.ToBytes(), dstAddr); err != nil {
return false, fmt.Errorf("couldn't send a packet to %s: %w", dstAddr, err)
}
for {
if err = c.SetDeadline(time.Now().Add(defaultDiscoverTime)); err != nil {
return false, fmt.Errorf("setting deadline: %w", err)
}
var next bool
ok, next, err = tryConn4(req, c, iface)
if next {
@ -116,12 +153,10 @@ func tryConn4(req *dhcpv4.DHCPv4, c net.PacketConn, iface *net.Interface) (ok, n
log.Tracef("dhcpv4: waiting %v for an answer", defaultDiscoverTime)
b := make([]byte, 1500)
err = c.SetDeadline(time.Now().Add(defaultDiscoverTime))
if err != nil {
return false, false, fmt.Errorf("setting deadline: %w", err)
}
n, _, err := c.ReadFrom(b)
if n > 0 {
log.Debug("received %d bytes: %v", n, b)
}
if err != nil {
if isTimeout(err) {
log.Debug("dhcpv4: didn't receive dhcp response")
@ -159,31 +194,21 @@ func tryConn4(req *dhcpv4.DHCPv4, c net.PacketConn, iface *net.Interface) (ok, n
return true, false, nil
}
// CheckIfOtherDHCPServersPresentV6 sends a DHCP request to the specified network interface,
// and waits for a response for a period defined by defaultDiscoverTime
func CheckIfOtherDHCPServersPresentV6(ifaceName string) (ok bool, err error) {
iface, err := net.InterfaceByName(ifaceName)
// checkOtherDHCPv6 sends a DHCP request to the specified network interface, and
// waits for a response for a period defined by defaultDiscoverTime.
func checkOtherDHCPv6(iface *net.Interface) (ok bool, err error) {
ifaceIPNet, err := IfaceIPAddrs(iface, IPVersion6)
if err != nil {
return false, fmt.Errorf("dhcpv6: net.InterfaceByName: %s: %w", ifaceName, err)
}
ifaceIPNet, err := ifaceIPAddrs(iface, ipVersion6)
if err != nil {
return false, fmt.Errorf("getting ipv6 addrs for iface %s: %w", ifaceName, err)
return false, fmt.Errorf("getting ipv6 addrs for iface %s: %w", iface.Name, err)
}
if len(ifaceIPNet) == 0 {
return false, fmt.Errorf("interface %s has no ipv6 addresses", ifaceName)
return false, fmt.Errorf("interface %s has no ipv6 addresses", iface.Name)
}
srcIP := ifaceIPNet[0]
src := netutil.JoinHostPort(srcIP.String(), 546)
dst := "[ff02::1:2]:547"
req, err := dhcpv6.NewSolicit(iface.HardwareAddr)
if err != nil {
return false, fmt.Errorf("dhcpv6: dhcpv6.NewSolicit: %w", err)
}
udpAddr, err := net.ResolveUDPAddr("udp6", src)
if err != nil {
return false, fmt.Errorf("dhcpv6: Couldn't resolve UDP address %s: %w", src, err)
@ -198,18 +223,25 @@ func CheckIfOtherDHCPServersPresentV6(ifaceName string) (ok bool, err error) {
return false, fmt.Errorf("dhcpv6: Couldn't resolve UDP address %s: %w", dst, err)
}
return discover6(iface, udpAddr, dstAddr)
}
func discover6(iface *net.Interface, udpAddr, dstAddr *net.UDPAddr) (ok bool, err error) {
req, err := dhcpv6.NewSolicit(iface.HardwareAddr)
if err != nil {
return false, fmt.Errorf("dhcpv6: dhcpv6.NewSolicit: %w", err)
}
log.Debug("DHCPv6: Listening to udp6 %+v", udpAddr)
c, err := nclient6.NewIPv6UDPConn(ifaceName, dhcpv6.DefaultClientPort)
c, err := nclient6.NewIPv6UDPConn(iface.Name, dhcpv6.DefaultClientPort)
if err != nil {
return false, fmt.Errorf("dhcpv6: Couldn't listen on :546: %w", err)
}
if c != nil {
defer func() { err = errors.WithDeferred(err, c.Close()) }()
}
defer func() { err = errors.WithDeferred(err, c.Close()) }()
_, err = c.WriteTo(req.ToBytes(), dstAddr)
if err != nil {
return false, fmt.Errorf("dhcpv6: Couldn't send a packet to %s: %w", dst, err)
return false, fmt.Errorf("dhcpv6: Couldn't send a packet to %s: %w", dstAddr, err)
}
for {
@ -288,3 +320,15 @@ func tryConn6(req *dhcpv6.Message, c net.PacketConn) (ok, next bool, err error)
return true, false, nil
}
// isTimeout returns true if err is an operation timeout error from net package.
//
// TODO(e.burkov): Consider moving into netutil.
func isTimeout(err error) (ok bool) {
var operr *net.OpError
if errors.As(err, &operr) {
return operr.Timeout()
}
return false
}

13
internal/aghnet/dhcp_windows.go Normal file
View file

@ -0,0 +1,13 @@
//go:build windows
// +build windows
package aghnet
import "github.com/AdguardTeam/AdGuardHome/internal/aghos"
func checkOtherDHCP(ifaceName string) (ok4, ok6 bool, err4, err6 error) {
return false,
false,
aghos.Unsupported("CheckIfOtherDHCPServersPresentV4"),
aghos.Unsupported("CheckIfOtherDHCPServersPresentV6")
}

118
internal/aghnet/interfaces.go Normal file
View file

@ -0,0 +1,118 @@
package aghnet
import (
"fmt"
"net"
"time"
"github.com/AdguardTeam/golibs/log"
)
// IPVersion is a documentational alias for int. Use it when the integer means
// IP version.
type IPVersion = int
// IP version constants.
const (
IPVersion4 IPVersion = 4
IPVersion6 IPVersion = 6
)
// NetIface is the interface for network interface methods.
type NetIface interface {
Addrs() ([]net.Addr, error)
}
// IfaceIPAddrs returns the interface's IP addresses.
func IfaceIPAddrs(iface NetIface, ipv IPVersion) (ips []net.IP, err error) {
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, a := range addrs {
var ip net.IP
switch a := a.(type) {
case *net.IPAddr:
ip = a.IP
case *net.IPNet:
ip = a.IP
default:
continue
}
// Assume that net.(*Interface).Addrs can only return valid IPv4
// and IPv6 addresses. Thus, if it isn't an IPv4 address, it
// must be an IPv6 one.
switch ipv {
case IPVersion4:
if ip4 := ip.To4(); ip4 != nil {
ips = append(ips, ip4)
}
case IPVersion6:
if ip6 := ip.To4(); ip6 == nil {
ips = append(ips, ip)
}
default:
return nil, fmt.Errorf("invalid ip version %d", ipv)
}
}
return ips, nil
}
// IfaceDNSIPAddrs returns IP addresses of the interface suitable to send to
// clients as DNS addresses. If err is nil, addrs contains either no addresses
// or at least two.
//
// It makes up to maxAttempts attempts to get the addresses if there are none,
// each time using the provided backoff. Sometimes an interface needs a few
// seconds to really ititialize.
//
// See https://github.com/AdguardTeam/AdGuardHome/issues/2304.
func IfaceDNSIPAddrs(
iface NetIface,
ipv IPVersion,
maxAttempts int,
backoff time.Duration,
) (addrs []net.IP, err error) {
var n int
for n = 1; n <= maxAttempts; n++ {
addrs, err = IfaceIPAddrs(iface, ipv)
if err != nil {
return nil, fmt.Errorf("getting ip addrs: %w", err)
}
if len(addrs) > 0 {
break
}
log.Debug("dhcpv%d: attempt %d: no ip addresses", ipv, n)
time.Sleep(backoff)
}
switch len(addrs) {
case 0:
// Don't return errors in case the users want to try and enable
// the DHCP server later.
t := time.Duration(n) * backoff
log.Error("dhcpv%d: no ip for iface after %d attempts and %s", ipv, n, t)
return nil, nil
case 1:
// Some Android devices use 8.8.8.8 if there is not a secondary
// DNS server. Fix that by setting the secondary DNS address to
// the same address.
//
// See https://github.com/AdguardTeam/AdGuardHome/issues/1708.
log.Debug("dhcpv%d: setting secondary dns ip to itself", ipv)
addrs = append(addrs, addrs[0])
default:
// Go on.
}
log.Debug("dhcpv%d: got addresses %s after %d attempts", ipv, addrs, n)
return addrs, nil
}

46
internal/dhcpd/v46_test.go → internal/aghnet/interfaces_test.go
View file

@ -1,4 +1,4 @@
package dhcpd
package aghnet
import (
"net"
@ -14,7 +14,7 @@ type fakeIface struct {
err error
}
// Addrs implements the netIface interface for *fakeIface.
// Addrs implements the NetIface interface for *fakeIface.
func (iface *fakeIface) Addrs() (addrs []net.Addr, err error) {
if iface.err != nil {
return nil, iface.err
@ -34,51 +34,51 @@ func TestIfaceIPAddrs(t *testing.T) {
testCases := []struct {
name string
iface netIface
ipv ipVersion
iface NetIface
ipv IPVersion
want []net.IP
wantErr error
}{{
name: "ipv4_success",
iface: &fakeIface{addrs: []net.Addr{addr4}, err: nil},
ipv: ipVersion4,
ipv: IPVersion4,
want: []net.IP{ip4},
wantErr: nil,
}, {
name: "ipv4_success_with_ipv6",
iface: &fakeIface{addrs: []net.Addr{addr6, addr4}, err: nil},
ipv: ipVersion4,
ipv: IPVersion4,
want: []net.IP{ip4},
wantErr: nil,
}, {
name: "ipv4_error",
iface: &fakeIface{addrs: []net.Addr{addr4}, err: errTest},
ipv: ipVersion4,
ipv: IPVersion4,
want: nil,
wantErr: errTest,
}, {
name: "ipv6_success",
iface: &fakeIface{addrs: []net.Addr{addr6}, err: nil},
ipv: ipVersion6,
ipv: IPVersion6,
want: []net.IP{ip6},
wantErr: nil,
}, {
name: "ipv6_success_with_ipv4",
iface: &fakeIface{addrs: []net.Addr{addr6, addr4}, err: nil},
ipv: ipVersion6,
ipv: IPVersion6,
want: []net.IP{ip6},
wantErr: nil,
}, {
name: "ipv6_error",
iface: &fakeIface{addrs: []net.Addr{addr6}, err: errTest},
ipv: ipVersion6,
ipv: IPVersion6,
want: nil,
wantErr: errTest,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
got, gotErr := ifaceIPAddrs(tc.iface, tc.ipv)
got, gotErr := IfaceIPAddrs(tc.iface, tc.ipv)
require.True(t, errors.Is(gotErr, tc.wantErr))
assert.Equal(t, tc.want, got)
})
@ -91,7 +91,7 @@ type waitingFakeIface struct {
n int
}
// Addrs implements the netIface interface for *waitingFakeIface.
// Addrs implements the NetIface interface for *waitingFakeIface.
func (iface *waitingFakeIface) Addrs() (addrs []net.Addr, err error) {
if iface.err != nil {
return nil, iface.err
@ -117,63 +117,63 @@ func TestIfaceDNSIPAddrs(t *testing.T) {
testCases := []struct {
name string
iface netIface
ipv ipVersion
iface NetIface
ipv IPVersion
want []net.IP
wantErr error
}{{
name: "ipv4_success",
iface: &fakeIface{addrs: []net.Addr{addr4}, err: nil},
ipv: ipVersion4,
ipv: IPVersion4,
want: []net.IP{ip4, ip4},
wantErr: nil,
}, {
name: "ipv4_success_with_ipv6",
iface: &fakeIface{addrs: []net.Addr{addr6, addr4}, err: nil},
ipv: ipVersion4,
ipv: IPVersion4,
want: []net.IP{ip4, ip4},
wantErr: nil,
}, {
name: "ipv4_error",
iface: &fakeIface{addrs: []net.Addr{addr4}, err: errTest},
ipv: ipVersion4,
ipv: IPVersion4,
want: nil,
wantErr: errTest,
}, {
name: "ipv4_wait",
iface: &waitingFakeIface{addrs: []net.Addr{addr4}, err: nil, n: 1},
ipv: ipVersion4,
ipv: IPVersion4,
want: []net.IP{ip4, ip4},
wantErr: nil,
}, {
name: "ipv6_success",
iface: &fakeIface{addrs: []net.Addr{addr6}, err: nil},
ipv: ipVersion6,
ipv: IPVersion6,
want: []net.IP{ip6, ip6},
wantErr: nil,
}, {
name: "ipv6_success_with_ipv4",
iface: &fakeIface{addrs: []net.Addr{addr6, addr4}, err: nil},
ipv: ipVersion6,
ipv: IPVersion6,
want: []net.IP{ip6, ip6},
wantErr: nil,
}, {
name: "ipv6_error",
iface: &fakeIface{addrs: []net.Addr{addr6}, err: errTest},
ipv: ipVersion6,
ipv: IPVersion6,
want: nil,
wantErr: errTest,
}, {
name: "ipv6_wait",
iface: &waitingFakeIface{addrs: []net.Addr{addr6}, err: nil, n: 1},
ipv: ipVersion6,
ipv: IPVersion6,
want: []net.IP{ip6, ip6},
wantErr: nil,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
got, gotErr := ifaceDNSIPAddrs(tc.iface, tc.ipv, 2, 0)
got, gotErr := IfaceDNSIPAddrs(tc.iface, tc.ipv, 2, 0)
require.True(t, errors.Is(gotErr, tc.wantErr))
assert.Equal(t, tc.want, got)
})

16
internal/aghnet/net.go
View file

@ -294,3 +294,19 @@ func CollectAllIfacesAddrs() (addrs []string, err error) {
return addrs, nil
}
// BroadcastFromIPNet calculates the broadcast IP address for n.
func BroadcastFromIPNet(n *net.IPNet) (dc net.IP) {
dc = netutil.CloneIP(n.IP)
mask := n.Mask
if mask == nil {
mask = dc.DefaultMask()
}
for i, b := range mask {
dc[i] |= ^b
}
return dc
}

11
internal/aghnet/net_darwin.go
View file

@ -48,9 +48,14 @@ func getCurrentHardwarePortInfo(ifaceName string) (hardwarePortInfo, error) {
return getHardwarePortInfo(hardwarePort)
}
// 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 to parse the output
// 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
// to parse the output
//
// 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")
if err != nil {

1
internal/aghnet/net_linux.go
View file

@ -48,7 +48,6 @@ func (rc *recurrentChecker) checkFile(sourcePath, desired string) (
if err != nil {
return nil, false, err
}
defer func() { err = errors.WithDeferred(err, f.Close()) }()
var r io.Reader

70
internal/aghnet/net_openbsd.go Normal file
View file

@ -0,0 +1,70 @@
//go:build openbsd
// +build openbsd
package aghnet
import (
"bufio"
"fmt"
"io"
"net"
"os"
"strings"
"github.com/AdguardTeam/AdGuardHome/internal/aghio"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/errors"
)
func canBindPrivilegedPorts() (can bool, err error) {
return aghos.HaveAdminRights()
}
// maxCheckedFileSize is the maximum acceptable length of the /etc/hostname.*
// files.
const maxCheckedFileSize = 1024 * 1024
func ifaceHasStaticIP(ifaceName string) (ok bool, err error) {
const filenameFmt = "/etc/hostname.%s"
filename := fmt.Sprintf(filenameFmt, ifaceName)
var f *os.File
if f, err = os.Open(filename); err != nil {
if errors.Is(err, os.ErrNotExist) {
err = nil
}
return false, err
}
defer func() { err = errors.WithDeferred(err, f.Close()) }()
var r io.Reader
r, err = aghio.LimitReader(f, maxCheckedFileSize)
if err != nil {
return false, err
}
return hostnameIfStaticConfig(r)
}
// hostnameIfStaticConfig checks if the interface is configured by
// /etc/hostname.* to have a static IP.
//
// TODO(e.burkov): The platform-dependent functions to check the static IP
// address configured are rather similar. Think about unifying common parts.
func hostnameIfStaticConfig(r io.Reader) (has bool, err error) {
s := bufio.NewScanner(r)
for s.Scan() {
line := strings.TrimSpace(s.Text())
fields := strings.Fields(line)
if len(fields) >= 2 && fields[0] == "inet" && net.ParseIP(fields[1]) != nil {
return true, s.Err()
}
}
return false, s.Err()
}
func ifaceSetStaticIP(string) (err error) {
return aghos.Unsupported("setting static ip")
}

52
internal/aghnet/net_openbsd_test.go Normal file
View file

@ -0,0 +1,52 @@
//go:build openbsd
// +build openbsd
package aghnet
import (
"strings"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestHostnameIfStaticConfig(t *testing.T) {
const nl = "\n"
testCases := []struct {
name string
rcconfData string
wantHas bool
}{{
name: "simple",
rcconfData: `inet 127.0.0.253` + nl,
wantHas: true,
}, {
name: "case_sensitiveness",
rcconfData: `InEt 127.0.0.253` + nl,
wantHas: false,
}, {
name: "comments_and_trash",
rcconfData: `# comment 1` + nl +
`` + nl +
`# inet 127.0.0.253` + nl +
`inet` + nl,
wantHas: false,
}, {
name: "incorrect_config",
rcconfData: `inet6 127.0.0.253` + nl +
`inet 256.256.256.256` + nl,
wantHas: false,
}}
for _, tc := range testCases {
r := strings.NewReader(tc.rcconfData)
t.Run(tc.name, func(t *testing.T) {
has, err := hostnameIfStaticConfig(r)
require.NoError(t, err)
assert.Equal(t, tc.wantHas, has)
})
}
}

4
internal/aghnet/net_others.go
View file

@ -1,5 +1,5 @@
//go:build !(linux || darwin || freebsd)
// +build !linux,!darwin,!freebsd
//go:build !(linux || darwin || freebsd || openbsd)
// +build !linux,!darwin,!freebsd,!openbsd
package aghnet

50
internal/aghnet/net_test.go
View file

@ -1,8 +1,10 @@
package aghnet
import (
"net"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
@ -14,3 +16,51 @@ func TestGetValidNetInterfacesForWeb(t *testing.T) {
require.NotEmptyf(t, iface.Addresses, "no addresses found for %s", iface.Name)
}
}
func TestBroadcastFromIPNet(t *testing.T) {
known6 := net.IP{
1, 2, 3, 4,
5, 6, 7, 8,
9, 10, 11, 12,
13, 14, 15, 16,
}
testCases := []struct {
name string
subnet *net.IPNet
want net.IP
}{{
name: "full",
subnet: &net.IPNet{
IP: net.IP{192, 168, 0, 1},
Mask: net.IPMask{255, 255, 15, 0},
},
want: net.IP{192, 168, 240, 255},
}, {
name: "ipv6_no_mask",
subnet: &net.IPNet{
IP: known6,
},
want: known6,
}, {
name: "ipv4_no_mask",
subnet: &net.IPNet{
IP: net.IP{192, 168, 1, 2},
},
want: net.IP{192, 168, 1, 255},
}, {
name: "unspecified",
subnet: &net.IPNet{
IP: net.IP{0, 0, 0, 0},
Mask: net.IPMask{0, 0, 0, 0},
},
want: net.IPv4bcast,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
bc := BroadcastFromIPNet(tc.subnet)
assert.True(t, bc.Equal(tc.want), bc)
})
}
}

14
internal/dhcpd/checkother_windows.go
View file

@ -1,14 +0,0 @@
//go:build windows
// +build windows
package dhcpd
import "github.com/AdguardTeam/AdGuardHome/internal/aghos"
func CheckIfOtherDHCPServersPresentV4(ifaceName string) (bool, error) {
return false, aghos.Unsupported("CheckIfOtherDHCPServersPresentV4")
}
func CheckIfOtherDHCPServersPresentV6(ifaceName string) (bool, error) {
return false, aghos.Unsupported("CheckIfOtherDHCPServersPresentV6")
}

1
internal/dhcpd/dhcpd.go
View file

@ -15,7 +15,6 @@ import (
)
const (
defaultDiscoverTime = time.Second * 3
// leaseExpireStatic is used to define the Expiry field for static
// leases.
//

8
internal/dhcpd/helpers.go
View file

@ -6,14 +6,6 @@ import (
"net"
)
func isTimeout(err error) bool {
operr, ok := err.(*net.OpError)
if !ok {
return false
}
return operr.Timeout()
}
func tryTo4(ip net.IP) (ip4 net.IP, err error) {
if ip == nil {
return nil, fmt.Errorf("%v is not an IP address", ip)

41
internal/dhcpd/http.go
View file

@ -398,60 +398,63 @@ func (s *Server) handleDHCPFindActiveServer(w http.ResponseWriter, r *http.Reque
msg := fmt.Sprintf("failed to read request body: %s", err)
log.Error(msg)
http.Error(w, msg, http.StatusBadRequest)
return
}
interfaceName := strings.TrimSpace(string(body))
if interfaceName == "" {
ifaceName := strings.TrimSpace(string(body))
if ifaceName == "" {
msg := "empty interface name specified"
log.Error(msg)
http.Error(w, msg, http.StatusBadRequest)
return
}
result := dhcpSearchResult{
V4: dhcpSearchV4Result{
OtherServer: dhcpSearchOtherResult{},
OtherServer: dhcpSearchOtherResult{
Found: "no",
},
StaticIP: dhcpStaticIPStatus{
Static: "yes",
},
},
V6: dhcpSearchV6Result{
OtherServer: dhcpSearchOtherResult{},
OtherServer: dhcpSearchOtherResult{
Found: "no",
},
},
}
found4, err4 := CheckIfOtherDHCPServersPresentV4(interfaceName)
isStaticIP, err := aghnet.IfaceHasStaticIP(interfaceName)
if err != nil {
if isStaticIP, serr := aghnet.IfaceHasStaticIP(ifaceName); serr != nil {
result.V4.StaticIP.Static = "error"
result.V4.StaticIP.Error = err.Error()
result.V4.StaticIP.Error = serr.Error()
} else if !isStaticIP {
result.V4.StaticIP.Static = "no"
result.V4.StaticIP.IP = aghnet.GetSubnet(interfaceName).String()
// TODO(e.burkov): The returned IP should only be of version 4.
result.V4.StaticIP.IP = aghnet.GetSubnet(ifaceName).String()
}
if found4 {
result.V4.OtherServer.Found = "yes"
} else if err4 != nil {
found4, found6, err4, err6 := aghnet.CheckOtherDHCP(ifaceName)
if err4 != nil {
result.V4.OtherServer.Found = "error"
result.V4.OtherServer.Error = err4.Error()
} else if found4 {
result.V4.OtherServer.Found = "yes"
}
found6, err6 := CheckIfOtherDHCPServersPresentV6(interfaceName)
if found6 {
result.V6.OtherServer.Found = "yes"
} else if err6 != nil {
if err6 != nil {
result.V6.OtherServer.Found = "error"
result.V6.OtherServer.Error = err6.Error()
} else if found6 {
result.V6.OtherServer.Found = "yes"
}
w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(result)
if err != nil {
httpError(r, w, http.StatusInternalServerError, "Failed to marshal DHCP found json: %s", err)
return
}
}

14
internal/dhcpd/v4.go
View file

@ -971,7 +971,12 @@ func (s *v4Server) Start() (err error) {
log.Debug("dhcpv4: starting...")
dnsIPAddrs, err := ifaceDNSIPAddrs(iface, ipVersion4, defaultMaxAttempts, defaultBackoff)
dnsIPAddrs, err := aghnet.IfaceDNSIPAddrs(
iface,
aghnet.IPVersion4,
defaultMaxAttempts,
defaultBackoff,
)
if err != nil {
return fmt.Errorf("interface %s: %w", ifaceName, err)
}
@ -1061,12 +1066,7 @@ func v4Create(conf V4ServerConf) (srv DHCPServer, err error) {
IP: routerIP,
Mask: subnetMask,
}
bcastIP := netutil.CloneIP(routerIP)
for i, b := range subnetMask {
bcastIP[i] |= ^b
}
s.conf.broadcastIP = bcastIP
s.conf.broadcastIP = aghnet.BroadcastFromIPNet(s.conf.subnet)
s.conf.ipRange, err = newIPRange(conf.RangeStart, conf.RangeEnd)
if err != nil {

113
internal/dhcpd/v46.go
View file

@ -1,125 +1,12 @@
package dhcpd
import (
"fmt"
"net"
"time"
"github.com/AdguardTeam/golibs/log"
)
// ipVersion is a documentational alias for int. Use it when the integer means
// IP version.
type ipVersion = int
// IP version constants.
const (
ipVersion4 ipVersion = 4
ipVersion6 ipVersion = 6
)
// netIface is the interface for network interface methods.
type netIface interface {
Addrs() ([]net.Addr, error)
}
// ifaceIPAddrs returns the interface's IP addresses.
func ifaceIPAddrs(iface netIface, ipv ipVersion) (ips []net.IP, err error) {
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, a := range addrs {
var ip net.IP
switch a := a.(type) {
case *net.IPAddr:
ip = a.IP
case *net.IPNet:
ip = a.IP
default:
continue
}
// Assume that net.(*Interface).Addrs can only return valid IPv4
// and IPv6 addresses. Thus, if it isn't an IPv4 address, it
// must be an IPv6 one.
switch ipv {
case ipVersion4:
if ip4 := ip.To4(); ip4 != nil {
ips = append(ips, ip4)
}
case ipVersion6:
if ip6 := ip.To4(); ip6 == nil {
ips = append(ips, ip)
}
default:
return nil, fmt.Errorf("invalid ip version %d", ipv)
}
}
return ips, nil
}
// Currently used defaults for ifaceDNSAddrs.
const (
defaultMaxAttempts int = 10
defaultBackoff time.Duration = 500 * time.Millisecond
)
// ifaceDNSIPAddrs returns IP addresses of the interface suitable to send to
// clients as DNS addresses. If err is nil, addrs contains either no addresses
// or at least two.
//
// It makes up to maxAttempts attempts to get the addresses if there are none,
// each time using the provided backoff. Sometimes an interface needs a few
// seconds to really ititialize.
//
// See https://github.com/AdguardTeam/AdGuardHome/issues/2304.
func ifaceDNSIPAddrs(
iface netIface,
ipv ipVersion,
maxAttempts int,
backoff time.Duration,
) (addrs []net.IP, err error) {
var n int
for n = 1; n <= maxAttempts; n++ {
addrs, err = ifaceIPAddrs(iface, ipv)
if err != nil {
return nil, fmt.Errorf("getting ip addrs: %w", err)
}
if len(addrs) > 0 {
break
}
log.Debug("dhcpv%d: attempt %d: no ip addresses", ipv, n)
time.Sleep(backoff)
}
switch len(addrs) {
case 0:
// Don't return errors in case the users want to try and enable
// the DHCP server later.
t := time.Duration(n) * backoff
log.Error("dhcpv%d: no ip for iface after %d attempts and %s", ipv, n, t)
return nil, nil
case 1:
// Some Android devices use 8.8.8.8 if there is not a secondary
// DNS server. Fix that by setting the secondary DNS address to
// the same address.
//
// See https://github.com/AdguardTeam/AdGuardHome/issues/1708.
log.Debug("dhcpv%d: setting secondary dns ip to itself", ipv)
addrs = append(addrs, addrs[0])
default:
// Go on.
}
log.Debug("dhcpv%d: got addresses %s after %d attempts", ipv, addrs, n)
return addrs, nil
}

8
internal/dhcpd/v6.go
View file

@ -10,6 +10,7 @@ import (
"sync"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
@ -607,7 +608,12 @@ func (s *v6Server) Start() (err error) {
log.Debug("dhcpv6: starting...")
dnsIPAddrs, err := ifaceDNSIPAddrs(iface, ipVersion6, defaultMaxAttempts, defaultBackoff)
dnsIPAddrs, err := aghnet.IfaceDNSIPAddrs(
iface,
aghnet.IPVersion6,
defaultMaxAttempts,
defaultBackoff,
)
if err != nil {
return fmt.Errorf("interface %s: %w", ifaceName, err)
}

1
scripts/make/go-lint.sh
View file

@ -114,6 +114,7 @@ underscores() {
-e '_bsd.go'\
-e '_darwin.go'\
-e '_freebsd.go'\
-e '_openbsd.go'\
-e '_linux.go'\
-e '_little.go'\
-e '_others.go'\