package dhcpsvc import ( "fmt" "time" "github.com/AdguardTeam/golibs/netutil" "golang.org/x/exp/maps" "golang.org/x/exp/slices" ) // Config is the configuration for the DHCP service. type Config struct { // Interfaces stores configurations of DHCP server specific for the network // interface identified by its name. Interfaces map[string]*InterfaceConfig // LocalDomainName is the top-level domain name to use for resolving DHCP // clients' hostnames. LocalDomainName string // ICMPTimeout is the timeout for checking another DHCP server's presence. ICMPTimeout time.Duration // Enabled is the state of the service, whether it is enabled or not. Enabled bool } // InterfaceConfig is the configuration of a single DHCP interface. type InterfaceConfig struct { // IPv4 is the configuration of DHCP protocol for IPv4. IPv4 *IPv4Config // IPv6 is the configuration of DHCP protocol for IPv6. IPv6 *IPv6Config } // Validate returns an error in conf if any. func (conf *Config) Validate() (err error) { switch { case conf == nil: return errNilConfig case !conf.Enabled: return nil case conf.ICMPTimeout < 0: return newMustErr("icmp timeout", "be non-negative", conf.ICMPTimeout) } err = netutil.ValidateDomainName(conf.LocalDomainName) if err != nil { // Don't wrap the error since it's informative enough as is. return err } if len(conf.Interfaces) == 0 { return errNoInterfaces } ifaces := maps.Keys(conf.Interfaces) slices.Sort(ifaces) for _, iface := range ifaces { if err = conf.Interfaces[iface].validate(); err != nil { return fmt.Errorf("interface %q: %w", iface, err) } } return nil } // newMustErr returns an error that indicates that valName must be as must // describes. func newMustErr(valName, must string, val fmt.Stringer) (err error) { return fmt.Errorf("%s %s must %s", valName, val, must) } // validate returns an error in ic, if any. func (ic *InterfaceConfig) validate() (err error) { if ic == nil { return errNilConfig } if err = ic.IPv4.validate(); err != nil { return fmt.Errorf("ipv4: %w", err) } if err = ic.IPv6.validate(); err != nil { return fmt.Errorf("ipv6: %w", err) } return nil }