AdGuardHome/internal/dhcpsvc/server.go

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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
2023-10-02 11:21:16 +01:00
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
// leases is the set of active DHCP leases.
leases []*Lease
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
2023-10-02 11:21:16 +01:00
// 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
}
// type check
//
// TODO(e.burkov): Uncomment when the [Interface] interface is implemented.
// var _ Interface = (*DHCPServer)(nil)
// Enabled implements the [Interface] interface for *DHCPServer.
func (srv *DHCPServer) Enabled() (ok bool) {
return srv.enabled.Load()
}
// Leases implements the [Interface] interface for *DHCPServer.
func (srv *DHCPServer) Leases() (leases []*Lease) {
leases = make([]*Lease, 0, len(srv.leases))
for _, lease := range srv.leases {
leases = append(leases, lease.Clone())
}
return leases
}