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Pull request: dhcpd: fix interface ipv6 check

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Merge in DNS/adguard-home from 2355-dhcpcheck-ipv6 to master

Updates #2335.

Squashed commit of the following:

commit 5ce1cc7bc244ba5dd4a065d47dec8884fa3d45e7
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Nov 25 14:03:24 2020 +0300

    dhcpd: fix loop exit condition

commit 32b4b946bfa30159326dc295fa1a2607b78172af
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Nov 25 13:26:50 2020 +0300

    dhcpd: fix interface ipv6 check
This commit is contained in:
Ainar Garipov 2020-11-25 14:26:26 +03:00
parent 284da7c91b
commit 36c7735b85
9 changed files with 103 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
CHANGELOG.md
View File

@ -30,6 +30,13 @@ and this project adheres to
[#2297]: https://github.com/AdguardTeam/AdGuardHome/issues/2297
[#2306]: https://github.com/AdguardTeam/AdGuardHome/issues/2306
### Fixed
- Incorrect detection of the IPv6 address of an interface as well as another
infinite loop in the `/dhcp/find_active_dhcp` HTTP API [#2355].
[#2355]: https://github.com/AdguardTeam/AdGuardHome/issues/2355
## [v0.104.3] - 2020-11-19

10
internal/dhcpd/check_other_dhcp.go
View File

@ -94,12 +94,11 @@ func CheckIfOtherDHCPServersPresentV4(ifaceName string) (bool, error) {
continue
}
if ok {
return true, nil
}
if err != nil {
return false, err
}
return ok, nil
}
}
@ -216,12 +215,11 @@ func CheckIfOtherDHCPServersPresentV6(ifaceName string) (bool, error) {
continue
}
if ok {
return true, nil
}
if err != nil {
return false, err
}
return ok, nil
}
}

1
internal/dhcpd/db.go
View File

@ -74,7 +74,6 @@ func (s *Server) dbLoad() {
} else {
v6DynLeases = append(v6DynLeases, &lease)
}
} else {
if obj[i].Expiry == leaseExpireStatic {
staticLeases = append(staticLeases, &lease)

8
internal/dhcpd/nclient4/client_test.go
View File

@ -79,7 +79,7 @@ func serveAndClient(ctx context.Context, responses [][]*dhcpv4.DHCPv4, opts ...C
return mc, serverConn
}
func ComparePacket(got *dhcpv4.DHCPv4, want *dhcpv4.DHCPv4) error {
func ComparePacket(got, want *dhcpv4.DHCPv4) error {
if got == nil && got == want {
return nil
}
@ -92,7 +92,7 @@ func ComparePacket(got *dhcpv4.DHCPv4, want *dhcpv4.DHCPv4) error {
return nil
}
func pktsExpected(got []*dhcpv4.DHCPv4, want []*dhcpv4.DHCPv4) error {
func pktsExpected(got, want []*dhcpv4.DHCPv4) error {
if len(got) != len(want) {
return fmt.Errorf("got %d packets, want %d packets", len(got), len(want))
}
@ -309,10 +309,10 @@ func TestMultipleSendAndRead(t *testing.T) {
newPacket(dhcpv4.OpcodeBootRequest, [4]byte{0x44, 0x44, 0x44, 0x44}),
},
server: [][]*dhcpv4.DHCPv4{
[]*dhcpv4.DHCPv4{ // Response for first packet.
{ // Response for first packet.
newPacket(dhcpv4.OpcodeBootReply, [4]byte{0x33, 0x33, 0x33, 0x33}),
},
[]*dhcpv4.DHCPv4{ // Response for second packet.
{ // Response for second packet.
newPacket(dhcpv4.OpcodeBootReply, [4]byte{0x44, 0x44, 0x44, 0x44}),
},
},

18
internal/dhcpd/nclient4/conn_unix.go
View File

@ -17,17 +17,13 @@ import (
"github.com/u-root/u-root/pkg/uio"
)
var (
// BroadcastMac is the broadcast MAC address.
//
// Any UDP packet sent to this address is broadcast on the subnet.
BroadcastMac = net.HardwareAddr([]byte{255, 255, 255, 255, 255, 255})
)
// BroadcastMac is the broadcast MAC address.
//
// Any UDP packet sent to this address is broadcast on the subnet.
var BroadcastMac = net.HardwareAddr([]byte{255, 255, 255, 255, 255, 255})
var (
// ErrUDPAddrIsRequired is an error used when a passed argument is not of type "*net.UDPAddr".
ErrUDPAddrIsRequired = errors.New("must supply UDPAddr")
)
// ErrUDPAddrIsRequired is an error used when a passed argument is not of type "*net.UDPAddr".
var ErrUDPAddrIsRequired = errors.New("must supply UDPAddr")
// NewRawUDPConn returns a UDP connection bound to the interface and port
// given based on a raw packet socket. All packets are broadcasted.
@ -68,7 +64,7 @@ func NewBroadcastUDPConn(rawPacketConn net.PacketConn, boundAddr *net.UDPAddr) n
}
}
func udpMatch(addr *net.UDPAddr, bound *net.UDPAddr) bool {
func udpMatch(addr, bound *net.UDPAddr) bool {
if bound == nil {
return true
}

6
internal/dhcpd/nclient4/ipv4.go
View File

@ -281,7 +281,7 @@ func (b UDP) Checksum() uint16 {
// CalculateChecksum calculates the checksum of the udp packet, given the total
// length of the packet and the checksum of the network-layer pseudo-header
// (excluding the total length) and the checksum of the payload.
func (b UDP) CalculateChecksum(partialChecksum uint16, totalLen uint16) uint16 {
func (b UDP) CalculateChecksum(partialChecksum, totalLen uint16) uint16 {
// Add the length portion of the checksum to the pseudo-checksum.
tmp := make([]byte, 2)
binary.BigEndian.PutUint16(tmp, totalLen)
@ -336,13 +336,13 @@ func ChecksumCombine(a, b uint16) uint16 {
// given destination protocol and network address, ignoring the length
// field. Pseudo-headers are needed by transport layers when calculating
// their own checksum.
func PseudoHeaderChecksum(protocol TransportProtocolNumber, srcAddr net.IP, dstAddr net.IP) uint16 {
func PseudoHeaderChecksum(protocol TransportProtocolNumber, srcAddr, dstAddr net.IP) uint16 {
xsum := Checksum([]byte(srcAddr), 0)
xsum = Checksum([]byte(dstAddr), xsum)
return Checksum([]byte{0, uint8(protocol)}, xsum)
}
func udp4pkt(packet []byte, dest *net.UDPAddr, src *net.UDPAddr) []byte {
func udp4pkt(packet []byte, dest, src *net.UDPAddr) []byte {
ipLen := IPv4MinimumSize
udpLen := UDPMinimumSize

51
internal/dhcpd/v46_windows.go
View File

@ -7,41 +7,16 @@ import "net"
type winServer struct {
}
func (s *winServer) ResetLeases(leases []*Lease) {
}
func (s *winServer) GetLeases(flags int) []Lease {
return nil
}
func (s *winServer) GetLeasesRef() []*Lease {
return nil
}
func (s *winServer) AddStaticLease(lease Lease) error {
return nil
}
func (s *winServer) RemoveStaticLease(l Lease) error {
return nil
}
func (s *winServer) FindMACbyIP(ip net.IP) net.HardwareAddr {
return nil
}
func (s *winServer) WriteDiskConfig4(c *V4ServerConf) {
}
func (s *winServer) WriteDiskConfig6(c *V6ServerConf) {
}
func (s *winServer) Start() error {
return nil
}
func (s *winServer) Stop() {
}
func (s *winServer) Reset() {
}
func v4Create(conf V4ServerConf) (DHCPServer, error) {
return &winServer{}, nil
}
func v6Create(conf V6ServerConf) (DHCPServer, error) {
return &winServer{}, nil
}
func (s *winServer) ResetLeases(leases []*Lease) {}
func (s *winServer) GetLeases(flags int) []Lease { return nil }
func (s *winServer) GetLeasesRef() []*Lease { return nil }
func (s *winServer) AddStaticLease(lease Lease) error { return nil }
func (s *winServer) RemoveStaticLease(l Lease) error { return nil }
func (s *winServer) FindMACbyIP(ip net.IP) net.HardwareAddr { return nil }
func (s *winServer) WriteDiskConfig4(c *V4ServerConf) {}
func (s *winServer) WriteDiskConfig6(c *V6ServerConf) {}
func (s *winServer) Start() error { return nil }
func (s *winServer) Stop() {}
func (s *winServer) Reset() {}
func v4Create(conf V4ServerConf) (DHCPServer, error) { return &winServer{}, nil }
func v6Create(conf V6ServerConf) (DHCPServer, error) { return &winServer{}, nil }

13
internal/dhcpd/v6.go
View File

@ -537,8 +537,12 @@ func (s *v6Server) packetHandler(conn net.PacketConn, peer net.Addr, req dhcpv6.
}
}
type netIface interface {
Addrs() ([]net.Addr, error)
}
// ifaceIPv6Addrs returns the interface's IPv6 addresses.
func ifaceIPv6Addrs(iface *net.Interface) (ips []net.IP, err error) {
func ifaceIPv6Addrs(iface netIface) (ips []net.IP, err error) {
addrs, err := iface.Addrs()
if err != nil {
return nil, err
@ -550,8 +554,11 @@ func ifaceIPv6Addrs(iface *net.Interface) (ips []net.IP, err error) {
continue
}
if ip := ipnet.IP.To16(); ip != nil {
ips = append(ips, ip)
if ip := ipnet.IP.To4(); ip == nil {
// Assume that net.(*Interface).Addrs can only return
// valid IPv4 and IPv6 addresses. Since this isn't an
// IPv4 address, it must be an IPv6 one.
ips = append(ips, ipnet.IP)
}
}

55
internal/dhcpd/v6_test.go
View File

@ -6,6 +6,7 @@ import (
"net"
"testing"
"github.com/AdguardTeam/AdGuardHome/internal/agherr"
"github.com/insomniacslk/dhcp/dhcpv6"
"github.com/insomniacslk/dhcp/iana"
"github.com/stretchr/testify/assert"
@ -223,3 +224,57 @@ func TestV6GetDynamicLease(t *testing.T) {
assert.True(t, ip6InRange(net.ParseIP("2001::2"), net.ParseIP("2001::2")))
assert.True(t, ip6InRange(net.ParseIP("2001::2"), net.ParseIP("2001::3")))
}
type fakeIface struct {
addrs []net.Addr
err error
}
// Addrs implements the netIface interface for *fakeIface.
func (iface *fakeIface) Addrs() (addrs []net.Addr, err error) {
if iface.err != nil {
return nil, iface.err
}
return iface.addrs, nil
}
func TestIfaceIPv6Addrs(t *testing.T) {
ip := net.IP{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6}
ip4 := net.IP{1, 2, 3, 4}
addr := &net.IPNet{IP: ip}
errTest := agherr.Error("test error")
testCases := []struct {
name string
iface netIface
want []net.IP
wantErr error
}{{
name: "success",
iface: &fakeIface{addrs: []net.Addr{addr}, err: nil},
want: []net.IP{ip},
wantErr: nil,
}, {
name: "success_with_ipv4",
iface: &fakeIface{
addrs: []net.Addr{addr, &net.IPNet{IP: ip4}},
err: nil,
},
want: []net.IP{ip},
wantErr: nil,
}, {
name: "error",
iface: &fakeIface{addrs: []net.Addr{addr}, err: errTest},
want: nil,
wantErr: errTest,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
got, gotErr := ifaceIPv6Addrs(tc.iface)
assert.Equal(t, tc.want, got)
assert.Equal(t, tc.wantErr, gotErr)
})
}
}