AdGuardHome/internal/dhcpsvc/config.go

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package dhcpsvc
import (
"fmt"
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"time"
"github.com/AdguardTeam/golibs/netutil"
"golang.org/x/exp/maps"
"golang.org/x/exp/slices"
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)
// 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
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}
// 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)
}
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// validate returns an error in ic, if any.
func (ic *InterfaceConfig) validate() (err error) {
if ic == nil {
return errNilConfig
}
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if err = ic.IPv4.validate(); err != nil {
return fmt.Errorf("ipv4: %w", err)
}
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if err = ic.IPv6.validate(); err != nil {
return fmt.Errorf("ipv6: %w", err)
}
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return nil
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}