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package dhcpv4
import "fmt"
// This option implements the relay agent information option
// https://tools.ietf.org/html/rfc3046
// OptRelayAgentInformation is a "container" option for specific agent-supplied
// sub-options.
type OptRelayAgentInformation struct {
Options []Option
}
// ParseOptRelayAgentInformation returns a new OptRelayAgentInformation from a
// byte stream, or error if any.
func ParseOptRelayAgentInformation(data []byte) (*OptRelayAgentInformation, error) {
if len(data) < 4 {
return nil, ErrShortByteStream
}
code := OptionCode(data[0])
if code != OptionRelayAgentInformation {
return nil, fmt.Errorf("expected code %v, got %v", OptionRelayAgentInformation, code)
}
length := int(data[1])
if len(data) < 2+length {
return nil, ErrShortByteStream
}
options, err := OptionsFromBytesWithParser(data[2:length+2], relayParseOption)
if err != nil {
return nil, err
}
return &OptRelayAgentInformation{Options: options}, nil
}
func relayParseOption(data []byte) (Option, error) {
if len(data) < 2 {
return nil, ErrShortByteStream
}
code := OptionCode(data[0])
length := int(data[1])
if len(data) < 2+length {
return nil, ErrShortByteStream
}
return &OptionGeneric{OptionCode: code, Data: data[2:length+2]}, nil
}
// Code returns the option code.
func (o *OptRelayAgentInformation) Code() OptionCode {
return OptionRelayAgentInformation
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptRelayAgentInformation) ToBytes() []byte {
ret := []byte{byte(o.Code()), byte(o.Length())}
for _, opt := range o.Options {
ret = append(ret, opt.ToBytes()...)
}
return ret
}
// String returns a human-readable string for this option.
func (o *OptRelayAgentInformation) String() string {
return fmt.Sprintf("Relay Agent Information -> %v", o.Options)
}
// Length returns the length of the data portion (excluding option code and byte
// for length, if any).
func (o *OptRelayAgentInformation) Length() int {
l := 0
for _, opt := range o.Options {
l += 2 + opt.Length()
}
return l
}
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