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package dhcpv4
// This option implements the Client System Architecture Type option
// https://tools.ietf.org/html/rfc4578
import (
"encoding/binary"
"fmt"
)
//ArchType encodes an architecture type in an uint16
type ArchType uint16
// see rfc4578
const (
INTEL_X86PC ArchType = 0
NEC_PC98 ArchType = 1
EFI_ITANIUM ArchType = 2
DEC_ALPHA ArchType = 3
ARC_X86 ArchType = 4
INTEL_LEAN_CLIENT ArchType = 5
EFI_IA32 ArchType = 6
EFI_BC ArchType = 7
EFI_XSCALE ArchType = 8
EFI_X86_64 ArchType = 9
)
// ArchTypeToStringMap maps an ArchType to a mnemonic name
var ArchTypeToStringMap = map[ArchType]string{
INTEL_X86PC: "Intel x86PC",
NEC_PC98: "NEC/PC98",
EFI_ITANIUM: "EFI Itanium",
DEC_ALPHA: "DEC Alpha",
ARC_X86: "Arc x86",
INTEL_LEAN_CLIENT: "Intel Lean Client",
EFI_IA32: "EFI IA32",
EFI_BC: "EFI BC",
EFI_XSCALE: "EFI Xscale",
EFI_X86_64: "EFI x86-64",
}
// OptClientArchType represents an option encapsulating the Client System
// Architecture Type option Definition.
type OptClientArchType struct {
ArchTypes []ArchType
}
// Code returns the option code.
func (o *OptClientArchType) Code() OptionCode {
return OptionClientSystemArchitectureType
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptClientArchType) ToBytes() []byte {
ret := []byte{byte(o.Code()), byte(o.Length())}
for _, at := range o.ArchTypes {
buf := make([]byte, 2)
binary.BigEndian.PutUint16(buf[0:2], uint16(at))
ret = append(ret, buf...)
}
return ret
}
// Length returns the length of the data portion (excluding option code an byte
// length).
func (o *OptClientArchType) Length() int {
return 2*len(o.ArchTypes)
}
// String returns a human-readable string.
func (o *OptClientArchType) String() string {
var archTypes string
for idx, at := range o.ArchTypes {
name, ok := ArchTypeToStringMap[at]
if !ok {
name = "Unknown"
}
archTypes += name
if idx < len(o.ArchTypes)-1 {
archTypes += ", "
}
}
return fmt.Sprintf("Client System Architecture Type -> %v", archTypes)
}
// ParseOptClientArchType returns a new OptClientArchType from a byte stream,
// or error if any.
func ParseOptClientArchType(data []byte) (*OptClientArchType, error) {
if len(data) < 2 {
return nil, ErrShortByteStream
}
code := OptionCode(data[0])
if code != OptionClientSystemArchitectureType {
return nil, fmt.Errorf("expected code %v, got %v", OptionClientSystemArchitectureType, code)
}
length := int(data[1])
if length == 0 || length%2 != 0 {
return nil, fmt.Errorf("Invalid length: expected multiple of 2 larger than 2, got %v", length)
}
if len(data) < 2+length {
return nil, ErrShortByteStream
}
archTypes := make([]ArchType, 0, length%2)
for idx := 0; idx < length; idx += 2 {
b := data[2+idx : 2+idx+2]
archTypes = append(archTypes, ArchType(binary.BigEndian.Uint16(b)))
}
return &OptClientArchType{ArchTypes: archTypes}, nil
}
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