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package dhcpv4
import (
"fmt"
)
// RelayOptions is like Options, but stringifies using the Relay Agent Specific
// option space.
type RelayOptions struct {
Options
}
var relayHumanizer = OptionHumanizer{
ValueHumanizer: func(code OptionCode, data []byte) fmt.Stringer {
var d OptionDecoder
switch code {
case LinkSelectionSubOption, ServerIdentifierOverrideSubOption:
d = &IPs{}
}
if d != nil && d.FromBytes(data) == nil {
return d
}
return raiSubOptionValue{data}
},
CodeHumanizer: func(c uint8) OptionCode {
return raiSubOptionCode(c)
},
}
// String prints the contained options using Relay Agent-specific option code parsing.
func (r RelayOptions) String() string {
return "\n" + r.Options.ToString(relayHumanizer)
}
// FromBytes parses relay agent options from data.
func (r *RelayOptions) FromBytes(data []byte) error {
r.Options = make(Options)
return r.Options.FromBytes(data)
}
// OptRelayAgentInfo returns a new DHCP Relay Agent Info option.
//
// The relay agent info option is described by RFC 3046.
func OptRelayAgentInfo(o ...Option) Option {
return Option{Code: OptionRelayAgentInformation, Value: RelayOptions{OptionsFromList(o...)}}
}
type raiSubOptionValue struct {
val []byte
}
func (rv raiSubOptionValue) String() string {
return fmt.Sprintf("%q (%v)", string(rv.val), rv.val)
}
type raiSubOptionCode uint8
func (o raiSubOptionCode) Code() uint8 {
return uint8(o)
}
func (o raiSubOptionCode) String() string {
if s, ok := raiSubOptionCodeToString[o]; ok {
return s
}
return fmt.Sprintf("unknown (%d)", o)
}
// Option 82 Relay Agention Information Sub Options
const (
AgentCircuitIDSubOption raiSubOptionCode = 1 // RFC 3046
AgentRemoteIDSubOption raiSubOptionCode = 2 // RFC 3046
DOCSISDeviceClassSubOption raiSubOptionCode = 4 // RFC 3256
LinkSelectionSubOption raiSubOptionCode = 5 // RFC 3527
SubscriberIDSubOption raiSubOptionCode = 6 // RFC 3993
RADIUSAttributesSubOption raiSubOptionCode = 7 // RFC 4014
AuthenticationSubOption raiSubOptionCode = 8 // RFC 4030
VendorSpecificInformationSubOption raiSubOptionCode = 9 // RFC 4243
RelayAgentFlagsSubOption raiSubOptionCode = 10 // RFC 5010
ServerIdentifierOverrideSubOption raiSubOptionCode = 11 // RFC 5107
RelaySourcePortSubOption raiSubOptionCode = 19 // RFC 8357
VirtualSubnetSelectionSubOption raiSubOptionCode = 151 // RFC 6607
VirtualSubnetSelectionControlSubOption raiSubOptionCode = 152 // RFC 6607
)
var raiSubOptionCodeToString = map[raiSubOptionCode]string{
AgentCircuitIDSubOption: "Agent Circuit ID Sub-option",
AgentRemoteIDSubOption: "Agent Remote ID Sub-option",
DOCSISDeviceClassSubOption: "DOCSIS Device Class Sub-option",
LinkSelectionSubOption: "Link Selection Sub-option",
SubscriberIDSubOption: "Subscriber ID Sub-option",
RADIUSAttributesSubOption: "RADIUS Attributes Sub-option",
AuthenticationSubOption: "Authentication Sub-option",
VendorSpecificInformationSubOption: "Vendor Specific Sub-option",
RelayAgentFlagsSubOption: "Relay Agent Flags Sub-option",
ServerIdentifierOverrideSubOption: "Server Identifier Override Sub-option",
RelaySourcePortSubOption: "Relay Source Port Sub-option",
VirtualSubnetSelectionSubOption: "Virtual Subnet Selection Sub-option",
VirtualSubnetSelectionControlSubOption: "Virtual Subnet Selection Control Sub-option",
}
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