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package dhcpv4
import (
"net"
)
// WithTransactionID sets the Transaction ID for the DHCPv4 packet
func WithTransactionID(xid uint32) Modifier {
return func(d *DHCPv4) *DHCPv4 {
d.SetTransactionID(xid)
return d
}
}
// WithBroadcast sets the packet to be broadcast or unicast
func WithBroadcast(broadcast bool) Modifier {
return func(d *DHCPv4) *DHCPv4 {
if broadcast {
d.SetBroadcast()
} else {
d.SetUnicast()
}
return d
}
}
// WithHwAddr sets the hardware address for a packet
func WithHwAddr(hwaddr []byte) Modifier {
return func(d *DHCPv4) *DHCPv4 {
d.SetClientHwAddr(hwaddr)
return d
}
}
// WithOption appends a DHCPv4 option provided by the user
func WithOption(opt Option) Modifier {
return func(d *DHCPv4) *DHCPv4 {
d.AddOption(opt)
return d
}
}
// WithUserClass adds a user class option to the packet.
// The rfc parameter allows you to specify if the userclass should be
// rfc compliant or not. More details in issue #113
func WithUserClass(uc []byte, rfc bool) Modifier {
// TODO let the user specify multiple user classes
return func(d *DHCPv4) *DHCPv4 {
ouc := OptUserClass{
UserClasses: [][]byte{uc},
Rfc3004: rfc,
}
d.AddOption(&ouc)
return d
}
}
// WithNetboot adds bootfile URL and bootfile param options to a DHCPv4 packet.
func WithNetboot(d *DHCPv4) *DHCPv4 {
params := d.GetOneOption(OptionParameterRequestList)
var (
OptParams *OptParameterRequestList
foundOptionTFTPServerName bool
foundOptionBootfileName bool
)
if params != nil {
OptParams = params.(*OptParameterRequestList)
for _, option := range OptParams.RequestedOpts {
if option == OptionTFTPServerName {
foundOptionTFTPServerName = true
} else if option == OptionBootfileName {
foundOptionBootfileName = true
}
}
if !foundOptionTFTPServerName {
OptParams.RequestedOpts = append(OptParams.RequestedOpts, OptionTFTPServerName)
}
if !foundOptionBootfileName {
OptParams.RequestedOpts = append(OptParams.RequestedOpts, OptionBootfileName)
}
} else {
OptParams = &OptParameterRequestList{
RequestedOpts: []OptionCode{OptionTFTPServerName, OptionBootfileName},
}
d.AddOption(OptParams)
}
return d
}
// WithRequestedOptions adds requested options to the packet
func WithRequestedOptions(optionCodes ...OptionCode) Modifier {
return func(d *DHCPv4) *DHCPv4 {
params := d.GetOneOption(OptionParameterRequestList)
if params == nil {
params = &OptParameterRequestList{}
d.AddOption(params)
}
opts := params.(*OptParameterRequestList)
for _, optionCode := range optionCodes {
opts.RequestedOpts = append(opts.RequestedOpts, optionCode)
}
return d
}
}
// WithRelay adds parameters required for DHCPv4 to be relayed by the relay
// server with given ip
func WithRelay(ip net.IP) Modifier {
return func(d *DHCPv4) *DHCPv4 {
d.SetUnicast()
d.SetGatewayIPAddr(ip)
d.SetHopCount(1)
return d
}
}
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