mirror of
https://github.com/AdguardTeam/AdGuardHome.git
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Pull request 2014: 4923 gopacket dhcp vol.3
Merge in DNS/adguard-home from 4923-gopacket-dhcp-vol.3 to master
Updates #4923.
Squashed commit of the following:
commit 1a09c436e5666a515084cd5e76cfccd67991ae5e
Merge: 95bcf0720 c3f141a0a
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Thu Sep 28 19:38:57 2023 +0300
Merge branch 'master' into 4923-gopacket-dhcp-vol.3
commit 95bcf07206434fd451632e819926871ba8c14f08
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Thu Sep 28 13:19:42 2023 +0300
dhcpsvc: fix interface to match legacy version
commit 5da513ce177319f19698c5a8e1d10affaaf5e85c
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Thu Sep 28 12:32:21 2023 +0300
dhcpsvc: make it build on 32bit
commit 37a935514b1cebdc817cdcd5ec3562baeafbc42d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Wed Sep 27 19:39:35 2023 +0300
dhcpd: fix v6 as well
commit 03b5454b04c4fdb3fe928d661562883dc3e09d81
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Wed Sep 27 19:34:17 2023 +0300
dhcpsvc: imp code, docs
commit 91a0e451f78fba64578cc541f7ba66579c31d388
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Fri Sep 22 15:25:58 2023 +0300
dhcpsvc: imp filing
commit 57c91e1194caa00a69e62b6655b1b4e38b69b89f
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Fri Sep 22 15:23:02 2023 +0300
dhcpsvc: imp code
commit d86be56efbfc121c9fe2c5ecef992b4523e04d57
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Thu Sep 14 12:24:39 2023 +0300
dhcpsvc: imp code, docs
commit c9ef29057e9e378779d1a7938ad13b6eebda8f50
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Wed Sep 13 17:53:55 2023 +0300
dhcpsvc: add constructor, validations, tests
commit f2533ed64e4ef439603b9cdf9596f8b0c4a87cf1
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date: Tue Sep 12 23:05:42 2023 +0500
WIP
This commit is contained in:
Eugene Burkov
parent
c3f141a0a8
commit
39aeaf8910
12 changed files with 862 additions and 60 deletions
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@ -148,6 +148,9 @@ func (s *v4Server) ResetLeases(leases []*Lease) (err error) {
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return nil
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}
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s.leasesLock.Lock()
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defer s.leasesLock.Unlock()
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s.leasedOffsets = newBitSet()
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s.hostsIndex = make(map[string]*Lease, len(leases))
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s.ipIndex = make(map[netip.Addr]*Lease, len(leases))
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@ -182,16 +185,13 @@ func (s *v4Server) isBlocklisted(l *Lease) (ok bool) {
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return false
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}
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ok = true
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for _, b := range l.HWAddr {
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if b != 0 {
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ok = false
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break
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return false
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}
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}
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return ok
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return true
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}
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// GetLeases returns the list of current DHCP leases. It is safe for concurrent
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@ -90,6 +90,9 @@ func (s *v6Server) IPByHost(host string) (ip netip.Addr) {
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func (s *v6Server) ResetLeases(leases []*Lease) (err error) {
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defer func() { err = errors.Annotate(err, "dhcpv6: %w") }()
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s.leasesLock.Lock()
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defer s.leasesLock.Unlock()
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s.leases = nil
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for _, l := range leases {
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ip := net.IP(l.IP.AsSlice())
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@ -1,10 +1,12 @@
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package dhcpsvc
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import (
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"net/netip"
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"fmt"
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"time"
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"github.com/google/gopacket/layers"
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"github.com/AdguardTeam/golibs/netutil"
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"golang.org/x/exp/maps"
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"golang.org/x/exp/slices"
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)
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// Config is the configuration for the DHCP service.
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@ -33,54 +35,58 @@ type InterfaceConfig struct {
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IPv6 *IPv6Config
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}
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// IPv4Config is the interface-specific configuration for DHCPv4.
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type IPv4Config struct {
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// GatewayIP is the IPv4 address of the network's gateway. It is used as
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// the default gateway for DHCP clients and also used in calculating the
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// network-specific broadcast address.
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GatewayIP netip.Addr
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// Validate returns an error in conf if any.
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func (conf *Config) Validate() (err error) {
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switch {
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case conf == nil:
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return errNilConfig
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case !conf.Enabled:
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return nil
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case conf.ICMPTimeout < 0:
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return fmt.Errorf("icmp timeout %s must be non-negative", conf.ICMPTimeout)
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}
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// SubnetMask is the IPv4 subnet mask of the network. It should be a valid
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// IPv4 subnet mask (i.e. all 1s followed by all 0s).
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SubnetMask netip.Addr
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err = netutil.ValidateDomainName(conf.LocalDomainName)
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if err != nil {
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// Don't wrap the error since it's informative enough as is.
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return err
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}
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// RangeStart is the first address in the range to assign to DHCP clients.
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RangeStart netip.Addr
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if len(conf.Interfaces) == 0 {
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return errNoInterfaces
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}
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// RangeEnd is the last address in the range to assign to DHCP clients.
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RangeEnd netip.Addr
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ifaces := maps.Keys(conf.Interfaces)
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slices.Sort(ifaces)
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// Options is the list of DHCP options to send to DHCP clients.
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Options layers.DHCPOptions
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for _, iface := range ifaces {
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if err = conf.Interfaces[iface].validate(); err != nil {
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return fmt.Errorf("interface %q: %w", iface, err)
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}
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}
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// LeaseDuration is the TTL of a DHCP lease.
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LeaseDuration time.Duration
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// Enabled is the state of the DHCPv4 service, whether it is enabled or not
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// on the specific interface.
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Enabled bool
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return nil
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}
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// IPv6Config is the interface-specific configuration for DHCPv6.
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type IPv6Config struct {
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// RangeStart is the first address in the range to assign to DHCP clients.
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RangeStart netip.Addr
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// Options is the list of DHCP options to send to DHCP clients.
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Options layers.DHCPOptions
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// LeaseDuration is the TTL of a DHCP lease.
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LeaseDuration time.Duration
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// RASlaacOnly defines whether the DHCP clients should only use SLAAC for
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// address assignment.
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RASLAACOnly bool
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// RAAllowSlaac defines whether the DHCP clients may use SLAAC for address
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// assignment.
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RAAllowSLAAC bool
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// Enabled is the state of the DHCPv6 service, whether it is enabled or not
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// on the specific interface.
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Enabled bool
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// mustBeErr returns an error that indicates that valName must be as must
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// describes.
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func mustBeErr(valName, must string, val fmt.Stringer) (err error) {
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return fmt.Errorf("%s %s must %s", valName, val, must)
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}
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// validate returns an error in ic, if any.
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func (ic *InterfaceConfig) validate() (err error) {
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if ic == nil {
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return errNilConfig
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}
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if err = ic.IPv4.validate(); err != nil {
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return fmt.Errorf("ipv4: %w", err)
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}
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if err = ic.IPv6.validate(); err != nil {
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return fmt.Errorf("ipv6: %w", err)
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}
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return nil
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}
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88
internal/dhcpsvc/config_test.go
Normal file
88
internal/dhcpsvc/config_test.go
Normal file
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@ -0,0 +1,88 @@
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package dhcpsvc_test
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import (
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"testing"
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"github.com/AdguardTeam/AdGuardHome/internal/dhcpsvc"
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"github.com/AdguardTeam/golibs/testutil"
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)
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func TestConfig_Validate(t *testing.T) {
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testCases := []struct {
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name string
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conf *dhcpsvc.Config
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wantErrMsg string
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}{{
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name: "nil_config",
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conf: nil,
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wantErrMsg: "config is nil",
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}, {
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name: "disabled",
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conf: &dhcpsvc.Config{},
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wantErrMsg: "",
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}, {
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name: "empty",
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conf: &dhcpsvc.Config{
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Enabled: true,
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},
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wantErrMsg: `bad domain name "": domain name is empty`,
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}, {
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conf: &dhcpsvc.Config{
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Enabled: true,
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LocalDomainName: testLocalTLD,
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Interfaces: nil,
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},
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name: "no_interfaces",
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wantErrMsg: "no interfaces specified",
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}, {
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conf: &dhcpsvc.Config{
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Enabled: true,
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LocalDomainName: testLocalTLD,
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Interfaces: nil,
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},
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name: "no_interfaces",
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wantErrMsg: "no interfaces specified",
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}, {
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conf: &dhcpsvc.Config{
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Enabled: true,
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LocalDomainName: testLocalTLD,
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Interfaces: map[string]*dhcpsvc.InterfaceConfig{
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"eth0": nil,
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},
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},
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name: "nil_interface",
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wantErrMsg: `interface "eth0": config is nil`,
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}, {
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conf: &dhcpsvc.Config{
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Enabled: true,
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LocalDomainName: testLocalTLD,
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Interfaces: map[string]*dhcpsvc.InterfaceConfig{
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"eth0": {
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IPv4: nil,
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IPv6: &dhcpsvc.IPv6Config{Enabled: false},
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},
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},
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},
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name: "nil_ipv4",
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wantErrMsg: `interface "eth0": ipv4: config is nil`,
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}, {
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conf: &dhcpsvc.Config{
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Enabled: true,
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LocalDomainName: testLocalTLD,
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Interfaces: map[string]*dhcpsvc.InterfaceConfig{
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"eth0": {
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IPv4: &dhcpsvc.IPv4Config{Enabled: false},
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IPv6: nil,
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},
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},
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},
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name: "nil_ipv6",
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wantErrMsg: `interface "eth0": ipv6: config is nil`,
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}}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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testutil.AssertErrorMsg(t, tc.wantErrMsg, tc.conf.Validate())
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})
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}
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}
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@ -56,16 +56,17 @@ type Interface interface {
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// hostname, either set or generated.
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IPByHost(host string) (ip netip.Addr)
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// Leases returns all the DHCP leases.
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Leases() (leases []*Lease)
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// Leases returns all the active DHCP leases.
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Leases() (ls []*Lease)
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// AddLease adds a new DHCP lease. It returns an error if the lease is
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// invalid or already exists.
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AddLease(l *Lease) (err error)
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// EditLease changes an existing DHCP lease. It returns an error if there
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// is no lease equal to old or if new is invalid or already exists.
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EditLease(old, new *Lease) (err error)
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// UpdateStaticLease changes an existing DHCP lease. It returns an error if
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// there is no lease with such hardware addressor if new values are invalid
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// or already exist.
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UpdateStaticLease(l *Lease) (err error)
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// RemoveLease removes an existing DHCP lease. It returns an error if there
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// is no lease equal to l.
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@ -79,7 +80,7 @@ type Interface interface {
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type Empty struct{}
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// type check
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var _ Interface = Empty{}
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var _ agh.ServiceWithConfig[*Config] = Empty{}
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// Start implements the [Service] interface for Empty.
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func (Empty) Start() (err error) { return nil }
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@ -87,8 +88,6 @@ func (Empty) Start() (err error) { return nil }
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// Shutdown implements the [Service] interface for Empty.
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func (Empty) Shutdown(_ context.Context) (err error) { return nil }
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var _ agh.ServiceWithConfig[*Config] = Empty{}
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// Config implements the [ServiceWithConfig] interface for Empty.
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func (Empty) Config() (conf *Config) { return nil }
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@ -113,8 +112,8 @@ func (Empty) Leases() (leases []*Lease) { return nil }
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// AddLease implements the [Interface] interface for Empty.
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func (Empty) AddLease(_ *Lease) (err error) { return nil }
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// EditLease implements the [Interface] interface for Empty.
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func (Empty) EditLease(_, _ *Lease) (err error) { return nil }
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// UpdateStaticLease implements the [Interface] interface for Empty.
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func (Empty) UpdateStaticLease(_ *Lease) (err error) { return nil }
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// RemoveLease implements the [Interface] interface for Empty.
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func (Empty) RemoveLease(_ *Lease) (err error) { return nil }
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|
|
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11
internal/dhcpsvc/errors.go
Normal file
11
internal/dhcpsvc/errors.go
Normal file
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@ -0,0 +1,11 @@
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package dhcpsvc
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import "github.com/AdguardTeam/golibs/errors"
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const (
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// errNilConfig is returned when a nil config met.
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errNilConfig errors.Error = "config is nil"
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// errNoInterfaces is returned when no interfaces found in configuration.
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errNoInterfaces errors.Error = "no interfaces specified"
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)
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98
internal/dhcpsvc/iprange.go
Normal file
98
internal/dhcpsvc/iprange.go
Normal file
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@ -0,0 +1,98 @@
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package dhcpsvc
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import (
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"encoding/binary"
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"fmt"
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"math"
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"math/big"
|
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"net/netip"
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|
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"github.com/AdguardTeam/golibs/errors"
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)
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// ipRange is an inclusive range of IP addresses. A zero range doesn't contain
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// any IP addresses.
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//
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// It is safe for concurrent use.
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type ipRange struct {
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start netip.Addr
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end netip.Addr
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}
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|
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// maxRangeLen is the maximum IP range length. The bitsets used in servers only
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// accept uints, which can have the size of 32 bit.
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//
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// TODO(a.garipov, e.burkov): Reconsider the value for IPv6.
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const maxRangeLen = math.MaxUint32
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// newIPRange creates a new IP address range. start must be less than end. The
|
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// resulting range must not be greater than maxRangeLen.
|
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func newIPRange(start, end netip.Addr) (r ipRange, err error) {
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defer func() { err = errors.Annotate(err, "invalid ip range: %w") }()
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switch false {
|
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case start.Is4() == end.Is4():
|
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return ipRange{}, fmt.Errorf("%s and %s must be within the same address family", start, end)
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case start.Less(end):
|
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return ipRange{}, fmt.Errorf("start %s is greater than or equal to end %s", start, end)
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default:
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diff := (&big.Int{}).Sub(
|
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(&big.Int{}).SetBytes(end.AsSlice()),
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(&big.Int{}).SetBytes(start.AsSlice()),
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)
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|
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if !diff.IsUint64() || diff.Uint64() > maxRangeLen {
|
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return ipRange{}, fmt.Errorf("range length must be within %d", uint32(maxRangeLen))
|
||||
}
|
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}
|
||||
|
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return ipRange{
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start: start,
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end: end,
|
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}, nil
|
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}
|
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|
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// contains returns true if r contains ip.
|
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func (r ipRange) contains(ip netip.Addr) (ok bool) {
|
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// Assume that the end was checked to be within the same address family as
|
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// the start during construction.
|
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return r.start.Is4() == ip.Is4() && !ip.Less(r.start) && !r.end.Less(ip)
|
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}
|
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|
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// ipPredicate is a function that is called on every IP address in
|
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// [ipRange.find].
|
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type ipPredicate func(ip netip.Addr) (ok bool)
|
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|
||||
// find finds the first IP address in r for which p returns true. It returns an
|
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// empty [netip.Addr] if there are no addresses that satisfy p.
|
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//
|
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// TODO(e.burkov): Use.
|
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func (r ipRange) find(p ipPredicate) (ip netip.Addr) {
|
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for ip = r.start; !r.end.Less(ip); ip = ip.Next() {
|
||||
if p(ip) {
|
||||
return ip
|
||||
}
|
||||
}
|
||||
|
||||
return netip.Addr{}
|
||||
}
|
||||
|
||||
// offset returns the offset of ip from the beginning of r. It returns 0 and
|
||||
// false if ip is not in r.
|
||||
func (r ipRange) offset(ip netip.Addr) (offset uint64, ok bool) {
|
||||
if !r.contains(ip) {
|
||||
return 0, false
|
||||
}
|
||||
|
||||
startData, ipData := r.start.As16(), ip.As16()
|
||||
be := binary.BigEndian
|
||||
|
||||
// Assume that the range length was checked against maxRangeLen during
|
||||
// construction.
|
||||
return be.Uint64(ipData[8:]) - be.Uint64(startData[8:]), true
|
||||
}
|
||||
|
||||
// String implements the fmt.Stringer interface for *ipRange.
|
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func (r ipRange) String() (s string) {
|
||||
return fmt.Sprintf("%s-%s", r.start, r.end)
|
||||
}
|
||||
204
internal/dhcpsvc/iprange_internal_test.go
Normal file
204
internal/dhcpsvc/iprange_internal_test.go
Normal file
|
|
@ -0,0 +1,204 @@
|
|||
package dhcpsvc
|
||||
|
||||
import (
|
||||
"net/netip"
|
||||
"strconv"
|
||||
"testing"
|
||||
|
||||
"github.com/AdguardTeam/golibs/testutil"
|
||||
"github.com/stretchr/testify/assert"
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
func TestNewIPRange(t *testing.T) {
|
||||
start4 := netip.MustParseAddr("0.0.0.1")
|
||||
end4 := netip.MustParseAddr("0.0.0.3")
|
||||
start6 := netip.MustParseAddr("1::1")
|
||||
end6 := netip.MustParseAddr("1::3")
|
||||
end6Large := netip.MustParseAddr("2::3")
|
||||
|
||||
testCases := []struct {
|
||||
start netip.Addr
|
||||
end netip.Addr
|
||||
name string
|
||||
wantErrMsg string
|
||||
}{{
|
||||
start: start4,
|
||||
end: end4,
|
||||
name: "success_ipv4",
|
||||
wantErrMsg: "",
|
||||
}, {
|
||||
start: start6,
|
||||
end: end6,
|
||||
name: "success_ipv6",
|
||||
wantErrMsg: "",
|
||||
}, {
|
||||
start: end4,
|
||||
end: start4,
|
||||
name: "start_gt_end",
|
||||
wantErrMsg: "invalid ip range: start 0.0.0.3 is greater than or equal to end 0.0.0.1",
|
||||
}, {
|
||||
start: start4,
|
||||
end: start4,
|
||||
name: "start_eq_end",
|
||||
wantErrMsg: "invalid ip range: start 0.0.0.1 is greater than or equal to end 0.0.0.1",
|
||||
}, {
|
||||
start: start6,
|
||||
end: end6Large,
|
||||
name: "too_large",
|
||||
wantErrMsg: "invalid ip range: range length must be within " +
|
||||
strconv.FormatUint(maxRangeLen, 10),
|
||||
}, {
|
||||
start: start4,
|
||||
end: end6,
|
||||
name: "different_family",
|
||||
wantErrMsg: "invalid ip range: 0.0.0.1 and 1::3 must be within the same address family",
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
_, err := newIPRange(tc.start, tc.end)
|
||||
testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestIPRange_Contains(t *testing.T) {
|
||||
start, end := netip.MustParseAddr("0.0.0.1"), netip.MustParseAddr("0.0.0.3")
|
||||
r, err := newIPRange(start, end)
|
||||
require.NoError(t, err)
|
||||
|
||||
testCases := []struct {
|
||||
in netip.Addr
|
||||
want assert.BoolAssertionFunc
|
||||
name string
|
||||
}{{
|
||||
in: start,
|
||||
want: assert.True,
|
||||
name: "start",
|
||||
}, {
|
||||
in: end,
|
||||
want: assert.True,
|
||||
name: "end",
|
||||
}, {
|
||||
in: start.Next(),
|
||||
want: assert.True,
|
||||
name: "within",
|
||||
}, {
|
||||
in: netip.MustParseAddr("0.0.0.0"),
|
||||
want: assert.False,
|
||||
name: "before",
|
||||
}, {
|
||||
in: netip.MustParseAddr("0.0.0.4"),
|
||||
want: assert.False,
|
||||
name: "after",
|
||||
}, {
|
||||
in: netip.MustParseAddr("::"),
|
||||
want: assert.False,
|
||||
name: "another_family",
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
tc.want(t, r.contains(tc.in))
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestIPRange_Find(t *testing.T) {
|
||||
start, end := netip.MustParseAddr("0.0.0.1"), netip.MustParseAddr("0.0.0.5")
|
||||
r, err := newIPRange(start, end)
|
||||
require.NoError(t, err)
|
||||
|
||||
num, ok := r.offset(end)
|
||||
require.True(t, ok)
|
||||
|
||||
testCases := []struct {
|
||||
predicate ipPredicate
|
||||
want netip.Addr
|
||||
name string
|
||||
}{{
|
||||
predicate: func(ip netip.Addr) (ok bool) {
|
||||
ipData := ip.AsSlice()
|
||||
|
||||
return ipData[len(ipData)-1]%2 == 0
|
||||
},
|
||||
want: netip.MustParseAddr("0.0.0.2"),
|
||||
name: "even",
|
||||
}, {
|
||||
predicate: func(ip netip.Addr) (ok bool) {
|
||||
ipData := ip.AsSlice()
|
||||
|
||||
return ipData[len(ipData)-1]%10 == 0
|
||||
},
|
||||
want: netip.Addr{},
|
||||
name: "none",
|
||||
}, {
|
||||
predicate: func(ip netip.Addr) (ok bool) {
|
||||
return true
|
||||
},
|
||||
want: start,
|
||||
name: "first",
|
||||
}, {
|
||||
predicate: func(ip netip.Addr) (ok bool) {
|
||||
off, _ := r.offset(ip)
|
||||
|
||||
return off == num
|
||||
},
|
||||
want: end,
|
||||
name: "last",
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
got := r.find(tc.predicate)
|
||||
assert.Equal(t, tc.want, got)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestIPRange_Offset(t *testing.T) {
|
||||
start, end := netip.MustParseAddr("0.0.0.1"), netip.MustParseAddr("0.0.0.5")
|
||||
r, err := newIPRange(start, end)
|
||||
require.NoError(t, err)
|
||||
|
||||
testCases := []struct {
|
||||
in netip.Addr
|
||||
name string
|
||||
wantOffset uint64
|
||||
wantOK bool
|
||||
}{{
|
||||
in: netip.MustParseAddr("0.0.0.2"),
|
||||
name: "in",
|
||||
wantOffset: 1,
|
||||
wantOK: true,
|
||||
}, {
|
||||
in: start,
|
||||
name: "in_start",
|
||||
wantOffset: 0,
|
||||
wantOK: true,
|
||||
}, {
|
||||
in: end,
|
||||
name: "in_end",
|
||||
wantOffset: 4,
|
||||
wantOK: true,
|
||||
}, {
|
||||
in: netip.MustParseAddr("0.0.0.6"),
|
||||
name: "out_after",
|
||||
wantOffset: 0,
|
||||
wantOK: false,
|
||||
}, {
|
||||
in: netip.MustParseAddr("0.0.0.0"),
|
||||
name: "out_before",
|
||||
wantOffset: 0,
|
||||
wantOK: false,
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
offset, ok := r.offset(tc.in)
|
||||
assert.Equal(t, tc.wantOffset, offset)
|
||||
assert.Equal(t, tc.wantOK, ok)
|
||||
})
|
||||
}
|
||||
}
|
||||
77
internal/dhcpsvc/server.go
Normal file
77
internal/dhcpsvc/server.go
Normal file
|
|
@ -0,0 +1,77 @@
|
|||
package dhcpsvc
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"sync/atomic"
|
||||
"time"
|
||||
|
||||
"golang.org/x/exp/maps"
|
||||
"golang.org/x/exp/slices"
|
||||
)
|
||||
|
||||
// DHCPServer is a DHCP server for both IPv4 and IPv6 address families.
|
||||
type DHCPServer struct {
|
||||
// enabled indicates whether the DHCP server is enabled and can provide
|
||||
// information about its clients.
|
||||
enabled *atomic.Bool
|
||||
|
||||
// localTLD is the top-level domain name to use for resolving DHCP
|
||||
// clients' hostnames.
|
||||
localTLD string
|
||||
|
||||
// interfaces4 is the set of IPv4 interfaces sorted by interface name.
|
||||
interfaces4 []*iface4
|
||||
|
||||
// interfaces6 is the set of IPv6 interfaces sorted by interface name.
|
||||
interfaces6 []*iface6
|
||||
|
||||
// icmpTimeout is the timeout for checking another DHCP server's presence.
|
||||
icmpTimeout time.Duration
|
||||
}
|
||||
|
||||
// New creates a new DHCP server with the given configuration. It returns an
|
||||
// error if the given configuration can't be used.
|
||||
//
|
||||
// TODO(e.burkov): Use.
|
||||
func New(conf *Config) (srv *DHCPServer, err error) {
|
||||
if !conf.Enabled {
|
||||
// TODO(e.burkov): Perhaps return [Empty]?
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
ifaces4 := make([]*iface4, len(conf.Interfaces))
|
||||
ifaces6 := make([]*iface6, len(conf.Interfaces))
|
||||
|
||||
ifaceNames := maps.Keys(conf.Interfaces)
|
||||
slices.Sort(ifaceNames)
|
||||
|
||||
var i4 *iface4
|
||||
var i6 *iface6
|
||||
|
||||
for _, ifaceName := range ifaceNames {
|
||||
iface := conf.Interfaces[ifaceName]
|
||||
|
||||
i4, err = newIface4(ifaceName, iface.IPv4)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("interface %q: ipv4: %w", ifaceName, err)
|
||||
} else if i4 != nil {
|
||||
ifaces4 = append(ifaces4, i4)
|
||||
}
|
||||
|
||||
i6 = newIface6(ifaceName, iface.IPv6)
|
||||
if i6 != nil {
|
||||
ifaces6 = append(ifaces6, i6)
|
||||
}
|
||||
}
|
||||
|
||||
enabled := &atomic.Bool{}
|
||||
enabled.Store(conf.Enabled)
|
||||
|
||||
return &DHCPServer{
|
||||
enabled: enabled,
|
||||
interfaces4: ifaces4,
|
||||
interfaces6: ifaces6,
|
||||
localTLD: conf.LocalDomainName,
|
||||
icmpTimeout: conf.ICMPTimeout,
|
||||
}, nil
|
||||
}
|
||||
115
internal/dhcpsvc/server_test.go
Normal file
115
internal/dhcpsvc/server_test.go
Normal file
|
|
@ -0,0 +1,115 @@
|
|||
package dhcpsvc_test
|
||||
|
||||
import (
|
||||
"net/netip"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/internal/dhcpsvc"
|
||||
"github.com/AdguardTeam/golibs/testutil"
|
||||
)
|
||||
|
||||
// testLocalTLD is a common local TLD for tests.
|
||||
const testLocalTLD = "local"
|
||||
|
||||
func TestNew(t *testing.T) {
|
||||
validIPv4Conf := &dhcpsvc.IPv4Config{
|
||||
Enabled: true,
|
||||
GatewayIP: netip.MustParseAddr("192.168.0.1"),
|
||||
SubnetMask: netip.MustParseAddr("255.255.255.0"),
|
||||
RangeStart: netip.MustParseAddr("192.168.0.2"),
|
||||
RangeEnd: netip.MustParseAddr("192.168.0.254"),
|
||||
LeaseDuration: 1 * time.Hour,
|
||||
}
|
||||
gwInRangeConf := &dhcpsvc.IPv4Config{
|
||||
Enabled: true,
|
||||
GatewayIP: netip.MustParseAddr("192.168.0.100"),
|
||||
SubnetMask: netip.MustParseAddr("255.255.255.0"),
|
||||
RangeStart: netip.MustParseAddr("192.168.0.1"),
|
||||
RangeEnd: netip.MustParseAddr("192.168.0.254"),
|
||||
LeaseDuration: 1 * time.Hour,
|
||||
}
|
||||
badStartConf := &dhcpsvc.IPv4Config{
|
||||
Enabled: true,
|
||||
GatewayIP: netip.MustParseAddr("192.168.0.1"),
|
||||
SubnetMask: netip.MustParseAddr("255.255.255.0"),
|
||||
RangeStart: netip.MustParseAddr("127.0.0.1"),
|
||||
RangeEnd: netip.MustParseAddr("192.168.0.254"),
|
||||
LeaseDuration: 1 * time.Hour,
|
||||
}
|
||||
|
||||
validIPv6Conf := &dhcpsvc.IPv6Config{
|
||||
Enabled: true,
|
||||
RangeStart: netip.MustParseAddr("2001:db8::1"),
|
||||
LeaseDuration: 1 * time.Hour,
|
||||
RAAllowSLAAC: true,
|
||||
RASLAACOnly: true,
|
||||
}
|
||||
|
||||
testCases := []struct {
|
||||
conf *dhcpsvc.Config
|
||||
name string
|
||||
wantErrMsg string
|
||||
}{{
|
||||
conf: &dhcpsvc.Config{
|
||||
Enabled: true,
|
||||
LocalDomainName: testLocalTLD,
|
||||
Interfaces: map[string]*dhcpsvc.InterfaceConfig{
|
||||
"eth0": {
|
||||
IPv4: validIPv4Conf,
|
||||
IPv6: validIPv6Conf,
|
||||
},
|
||||
},
|
||||
},
|
||||
name: "valid",
|
||||
wantErrMsg: "",
|
||||
}, {
|
||||
conf: &dhcpsvc.Config{
|
||||
Enabled: true,
|
||||
LocalDomainName: testLocalTLD,
|
||||
Interfaces: map[string]*dhcpsvc.InterfaceConfig{
|
||||
"eth0": {
|
||||
IPv4: &dhcpsvc.IPv4Config{Enabled: false},
|
||||
IPv6: &dhcpsvc.IPv6Config{Enabled: false},
|
||||
},
|
||||
},
|
||||
},
|
||||
name: "disabled_interfaces",
|
||||
wantErrMsg: "",
|
||||
}, {
|
||||
conf: &dhcpsvc.Config{
|
||||
Enabled: true,
|
||||
LocalDomainName: testLocalTLD,
|
||||
Interfaces: map[string]*dhcpsvc.InterfaceConfig{
|
||||
"eth0": {
|
||||
IPv4: gwInRangeConf,
|
||||
IPv6: validIPv6Conf,
|
||||
},
|
||||
},
|
||||
},
|
||||
name: "gateway_within_range",
|
||||
wantErrMsg: `interface "eth0": ipv4: ` +
|
||||
`gateway ip 192.168.0.100 in the ip range 192.168.0.1-192.168.0.254`,
|
||||
}, {
|
||||
conf: &dhcpsvc.Config{
|
||||
Enabled: true,
|
||||
LocalDomainName: testLocalTLD,
|
||||
Interfaces: map[string]*dhcpsvc.InterfaceConfig{
|
||||
"eth0": {
|
||||
IPv4: badStartConf,
|
||||
IPv6: validIPv6Conf,
|
||||
},
|
||||
},
|
||||
},
|
||||
name: "bad_start",
|
||||
wantErrMsg: `interface "eth0": ipv4: ` +
|
||||
`range start 127.0.0.1 is not within 192.168.0.1/24`,
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
_, err := dhcpsvc.New(tc.conf)
|
||||
testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
|
||||
})
|
||||
}
|
||||
}
|
||||
113
internal/dhcpsvc/v4.go
Normal file
113
internal/dhcpsvc/v4.go
Normal file
|
|
@ -0,0 +1,113 @@
|
|||
package dhcpsvc
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net"
|
||||
"net/netip"
|
||||
"time"
|
||||
|
||||
"github.com/google/gopacket/layers"
|
||||
)
|
||||
|
||||
// IPv4Config is the interface-specific configuration for DHCPv4.
|
||||
type IPv4Config struct {
|
||||
// GatewayIP is the IPv4 address of the network's gateway. It is used as
|
||||
// the default gateway for DHCP clients and also used in calculating the
|
||||
// network-specific broadcast address.
|
||||
GatewayIP netip.Addr
|
||||
|
||||
// SubnetMask is the IPv4 subnet mask of the network. It should be a valid
|
||||
// IPv4 CIDR (i.e. all 1s followed by all 0s).
|
||||
SubnetMask netip.Addr
|
||||
|
||||
// RangeStart is the first address in the range to assign to DHCP clients.
|
||||
RangeStart netip.Addr
|
||||
|
||||
// RangeEnd is the last address in the range to assign to DHCP clients.
|
||||
RangeEnd netip.Addr
|
||||
|
||||
// Options is the list of DHCP options to send to DHCP clients.
|
||||
Options layers.DHCPOptions
|
||||
|
||||
// LeaseDuration is the TTL of a DHCP lease.
|
||||
LeaseDuration time.Duration
|
||||
|
||||
// Enabled is the state of the DHCPv4 service, whether it is enabled or not
|
||||
// on the specific interface.
|
||||
Enabled bool
|
||||
}
|
||||
|
||||
// validate returns an error in conf if any.
|
||||
func (conf *IPv4Config) validate() (err error) {
|
||||
switch {
|
||||
case conf == nil:
|
||||
return errNilConfig
|
||||
case !conf.Enabled:
|
||||
return nil
|
||||
case !conf.GatewayIP.Is4():
|
||||
return mustBeErr("gateway ip", "be a valid ipv4", conf.GatewayIP)
|
||||
case !conf.SubnetMask.Is4():
|
||||
return mustBeErr("subnet mask", "be a valid ipv4 cidr mask", conf.SubnetMask)
|
||||
case !conf.RangeStart.Is4():
|
||||
return mustBeErr("range start", "be a valid ipv4", conf.RangeStart)
|
||||
case !conf.RangeEnd.Is4():
|
||||
return mustBeErr("range end", "be a valid ipv4", conf.RangeEnd)
|
||||
case conf.LeaseDuration <= 0:
|
||||
return mustBeErr("lease duration", "be less than %d", conf.LeaseDuration)
|
||||
default:
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// iface4 is a DHCP interface for IPv4 address family.
|
||||
type iface4 struct {
|
||||
// gateway is the IP address of the network gateway.
|
||||
gateway netip.Addr
|
||||
|
||||
// subnet is the network subnet.
|
||||
subnet netip.Prefix
|
||||
|
||||
// addrSpace is the IPv4 address space allocated for leasing.
|
||||
addrSpace ipRange
|
||||
|
||||
// name is the name of the interface.
|
||||
name string
|
||||
|
||||
// TODO(e.burkov): Add options.
|
||||
|
||||
// leaseTTL is the time-to-live of dynamic leases on this interface.
|
||||
leaseTTL time.Duration
|
||||
}
|
||||
|
||||
// newIface4 creates a new DHCP interface for IPv4 address family with the given
|
||||
// configuration. It returns an error if the given configuration can't be used.
|
||||
func newIface4(name string, conf *IPv4Config) (i *iface4, err error) {
|
||||
if !conf.Enabled {
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
maskLen, _ := net.IPMask(conf.SubnetMask.AsSlice()).Size()
|
||||
subnet := netip.PrefixFrom(conf.GatewayIP, maskLen)
|
||||
|
||||
switch {
|
||||
case !subnet.Contains(conf.RangeStart):
|
||||
return nil, fmt.Errorf("range start %s is not within %s", conf.RangeStart, subnet)
|
||||
case !subnet.Contains(conf.RangeEnd):
|
||||
return nil, fmt.Errorf("range end %s is not within %s", conf.RangeEnd, subnet)
|
||||
}
|
||||
|
||||
addrSpace, err := newIPRange(conf.RangeStart, conf.RangeEnd)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
} else if addrSpace.contains(conf.GatewayIP) {
|
||||
return nil, fmt.Errorf("gateway ip %s in the ip range %s", conf.GatewayIP, addrSpace)
|
||||
}
|
||||
|
||||
return &iface4{
|
||||
name: name,
|
||||
gateway: conf.GatewayIP,
|
||||
subnet: subnet,
|
||||
addrSpace: addrSpace,
|
||||
leaseTTL: conf.LeaseDuration,
|
||||
}, nil
|
||||
}
|
||||
88
internal/dhcpsvc/v6.go
Normal file
88
internal/dhcpsvc/v6.go
Normal file
|
|
@ -0,0 +1,88 @@
|
|||
package dhcpsvc
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net/netip"
|
||||
"time"
|
||||
|
||||
"github.com/google/gopacket/layers"
|
||||
)
|
||||
|
||||
// IPv6Config is the interface-specific configuration for DHCPv6.
|
||||
type IPv6Config struct {
|
||||
// RangeStart is the first address in the range to assign to DHCP clients.
|
||||
RangeStart netip.Addr
|
||||
|
||||
// Options is the list of DHCP options to send to DHCP clients.
|
||||
Options layers.DHCPOptions
|
||||
|
||||
// LeaseDuration is the TTL of a DHCP lease.
|
||||
LeaseDuration time.Duration
|
||||
|
||||
// RASlaacOnly defines whether the DHCP clients should only use SLAAC for
|
||||
// address assignment.
|
||||
RASLAACOnly bool
|
||||
|
||||
// RAAllowSlaac defines whether the DHCP clients may use SLAAC for address
|
||||
// assignment.
|
||||
RAAllowSLAAC bool
|
||||
|
||||
// Enabled is the state of the DHCPv6 service, whether it is enabled or not
|
||||
// on the specific interface.
|
||||
Enabled bool
|
||||
}
|
||||
|
||||
// validate returns an error in conf if any.
|
||||
func (conf *IPv6Config) validate() (err error) {
|
||||
switch {
|
||||
case conf == nil:
|
||||
return errNilConfig
|
||||
case !conf.Enabled:
|
||||
return nil
|
||||
case !conf.RangeStart.Is6():
|
||||
return fmt.Errorf("range start %s should be a valid ipv6", conf.RangeStart)
|
||||
case conf.LeaseDuration <= 0:
|
||||
return fmt.Errorf("lease duration %s must be positive", conf.LeaseDuration)
|
||||
default:
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// iface6 is a DHCP interface for IPv6 address family.
|
||||
//
|
||||
// TODO(e.burkov): Add options.
|
||||
type iface6 struct {
|
||||
// rangeStart is the first IP address in the range.
|
||||
rangeStart netip.Addr
|
||||
|
||||
// name is the name of the interface.
|
||||
name string
|
||||
|
||||
// leaseTTL is the time-to-live of dynamic leases on this interface.
|
||||
leaseTTL time.Duration
|
||||
|
||||
// raSLAACOnly defines if DHCP should send ICMPv6.RA packets without MO
|
||||
// flags.
|
||||
raSLAACOnly bool
|
||||
|
||||
// raAllowSLAAC defines if DHCP should send ICMPv6.RA packets with MO flags.
|
||||
raAllowSLAAC bool
|
||||
}
|
||||
|
||||
// newIface6 creates a new DHCP interface for IPv6 address family with the given
|
||||
// configuration.
|
||||
//
|
||||
// TODO(e.burkov): Validate properly.
|
||||
func newIface6(name string, conf *IPv6Config) (i *iface6) {
|
||||
if !conf.Enabled {
|
||||
return nil
|
||||
}
|
||||
|
||||
return &iface6{
|
||||
name: name,
|
||||
rangeStart: conf.RangeStart,
|
||||
leaseTTL: conf.LeaseDuration,
|
||||
raSLAACOnly: conf.RASLAACOnly,
|
||||
raAllowSLAAC: conf.RAAllowSLAAC,
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue