traceroute

type Args struct {
	Host string
}

type Coms struct {
	SendChan chan *Probe
	RecvChan chan *Probe
}

type Flags struct {
	Host         string
	Proto        string
	ICMP         bool
	TCP          bool
	MaxHops      int
	DestPortSeq  uint
	TOS          int
	ProbesPerHop int
	Source       string
	Module       string
	UDP          bool
}

type ICMPHeader struct {
	IType    uint8
	ICode    uint8
	Checksum uint16
	ID       uint16
	Seq      uint16
}

type Probe struct {
	ID       uint32
	Sendtime time.Time
	RecvTime time.Time
	Dest     net.IP
	Port     uint16
	TTL      int
	Saddr    net.IP
	Done     bool
}

type TCPHeader struct {
	Src        uint16
	Dst        uint16
	SeqNum     uint32
	AckNum     uint32
	DataOffset uint8 // only use high 4 bits
	Flags      uint8 // only use low 6 bits
	Window     uint16
	Checksum   uint16
	Urgent     uint16
}

type Trace struct {
	DestIP net.IP

	// See --port in traceroute(8):
	// For UDP tracing, specifies the destination port base traceroute will use (the destination port number
	// will be incremented by each probe).
	// For ICMP tracing, specifies the initial ICMP sequence value (incremented by each probe too).
	// For TCP and others specifies just the (constant) destination port to connect.
	DestPort uint16

	SrcIP        net.IP
	PortOffset   int32
	MaxHops      int
	SendChan     chan<- *Probe
	ReceiveChan  chan<- *Probe
	TracesPerHop int
	PacketRate   int
	ICMPSeqStart uint16
}

type UDPHeader struct {
	Src    uint16
	Dst    uint16
	Length uint16
	Chksum uint16
}