AdGuardHome/internal/dhcpd/server.go

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package dhcpd
import (
"net"
"time"
)
// DHCPServer - DHCP server interface
type DHCPServer interface {
// ResetLeases resets leases.
ResetLeases(leases []*Lease) (err error)
// GetLeases returns deep clones of the current leases.
GetLeases(flags GetLeasesFlags) (leases []*Lease)
// AddStaticLease - add a static lease
AddStaticLease(l *Lease) (err error)
// RemoveStaticLease - remove a static lease
RemoveStaticLease(l *Lease) (err error)
// FindMACbyIP - find a MAC address by IP address in the currently active DHCP leases
FindMACbyIP(ip net.IP) net.HardwareAddr
// WriteDiskConfig4 - copy disk configuration
WriteDiskConfig4(c *V4ServerConf)
// WriteDiskConfig6 - copy disk configuration
WriteDiskConfig6(c *V6ServerConf)
// Start - start server
Start() (err error)
// Stop - stop server
Stop() (err error)
getLeasesRef() []*Lease
}
// V4ServerConf - server configuration
type V4ServerConf struct {
Enabled bool `yaml:"-" json:"-"`
InterfaceName string `yaml:"-" json:"-"`
GatewayIP net.IP `yaml:"gateway_ip" json:"gateway_ip"`
SubnetMask net.IP `yaml:"subnet_mask" json:"subnet_mask"`
// broadcastIP is the broadcasting address pre-calculated from the
// configured gateway IP and subnet mask.
broadcastIP net.IP
// The first & the last IP address for dynamic leases
// Bytes [0..2] of the last allowed IP address must match the first IP
RangeStart net.IP `yaml:"range_start" json:"range_start"`
RangeEnd net.IP `yaml:"range_end" json:"range_end"`
LeaseDuration uint32 `yaml:"lease_duration" json:"lease_duration"` // in seconds
// IP conflict detector: time (ms) to wait for ICMP reply
// 0: disable
ICMPTimeout uint32 `yaml:"icmp_timeout_msec" json:"-"`
// Custom Options.
//
// Option with arbitrary hexadecimal data:
// DEC_CODE hex HEX_DATA
// where DEC_CODE is a decimal DHCPv4 option code in range [1..255]
//
// Option with IP data (only 1 IP is supported):
// DEC_CODE ip IP_ADDR
Options []string `yaml:"options" json:"-"`
ipRange *ipRange
leaseTime time.Duration // the time during which a dynamic lease is considered valid
dnsIPAddrs []net.IP // IPv4 addresses to return to DHCP clients as DNS server addresses
// subnet contains the DHCP server's subnet. The IP is the IP of the
// gateway.
subnet *net.IPNet
options []dhcpOption
// notify is a way to signal to other components that leases have
// change. notify must be called outside of locked sections, since the
// clients might want to get the new data.
//
// TODO(a.garipov): This is utter madness and must be refactored. It
// just begs for deadlock bugs and other nastiness.
notify func(uint32)
}
// V6ServerConf - server configuration
type V6ServerConf struct {
Enabled bool `yaml:"-" json:"-"`
InterfaceName string `yaml:"-" json:"-"`
// The first IP address for dynamic leases
// The last allowed IP address ends with 0xff byte
RangeStart net.IP `yaml:"range_start" json:"range_start"`
LeaseDuration uint32 `yaml:"lease_duration" json:"lease_duration"` // in seconds
RASLAACOnly bool `yaml:"ra_slaac_only" json:"-"` // send ICMPv6.RA packets without MO flags
RAAllowSLAAC bool `yaml:"ra_allow_slaac" json:"-"` // send ICMPv6.RA packets with MO flags
ipStart net.IP // starting IP address for dynamic leases
leaseTime time.Duration // the time during which a dynamic lease is considered valid
dnsIPAddrs []net.IP // IPv6 addresses to return to DHCP clients as DNS server addresses
// Server calls this function when leases data changes
notify func(uint32)
}
type dhcpOption struct {
code uint8
data []byte
}