109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
package dhcpsvc
|
|
|
|
import (
|
|
"fmt"
|
|
"log/slog"
|
|
"os"
|
|
"time"
|
|
|
|
"github.com/AdguardTeam/golibs/errors"
|
|
"github.com/AdguardTeam/golibs/mapsutil"
|
|
"github.com/AdguardTeam/golibs/netutil"
|
|
)
|
|
|
|
// 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
|
|
|
|
// Logger will be used to log the DHCP events.
|
|
Logger *slog.Logger
|
|
|
|
// LocalDomainName is the top-level domain name to use for resolving DHCP
|
|
// clients' hostnames.
|
|
LocalDomainName string
|
|
|
|
// DBFilePath is the path to the database file containing the DHCP leases.
|
|
DBFilePath 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.
|
|
//
|
|
// TODO(e.burkov): Unexport and rewrite the test.
|
|
func (conf *Config) Validate() (err error) {
|
|
switch {
|
|
case conf == nil:
|
|
return errNilConfig
|
|
case !conf.Enabled:
|
|
return nil
|
|
}
|
|
|
|
var errs []error
|
|
if conf.ICMPTimeout < 0 {
|
|
err = newMustErr("icmp timeout", "be non-negative", conf.ICMPTimeout)
|
|
errs = append(errs, err)
|
|
}
|
|
|
|
err = netutil.ValidateDomainName(conf.LocalDomainName)
|
|
if err != nil {
|
|
// Don't wrap the error since it's informative enough as is.
|
|
errs = append(errs, err)
|
|
}
|
|
|
|
// This is a best-effort check for the file accessibility. The file will be
|
|
// checked again when it is opened later.
|
|
if _, err = os.Stat(conf.DBFilePath); err != nil && !errors.Is(err, os.ErrNotExist) {
|
|
errs = append(errs, fmt.Errorf("db file path %q: %w", conf.DBFilePath, err))
|
|
}
|
|
|
|
if len(conf.Interfaces) == 0 {
|
|
errs = append(errs, errNoInterfaces)
|
|
|
|
return errors.Join(errs...)
|
|
}
|
|
|
|
mapsutil.SortedRange(conf.Interfaces, func(iface string, ic *InterfaceConfig) (ok bool) {
|
|
err = ic.validate()
|
|
if err != nil {
|
|
errs = append(errs, fmt.Errorf("interface %q: %w", iface, err))
|
|
}
|
|
|
|
return true
|
|
})
|
|
|
|
return errors.Join(errs...)
|
|
}
|
|
|
|
// 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
|
|
}
|