socket

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v0.6.0 Latest Latest Go to latest Published: Jan 23, 2020 License: MIT Imports: 11 Imported by: 0

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Repository

github.com/nextdhcp/nextdhcp

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Open Source Insights

Documentation ¶

Index ¶

func ListenDHCP(l log.Logger, ip net.IP, iface *net.Interface) (net.PacketConn, error)
func PreparePacket(srcMAC net.HardwareAddr, srcIP net.IP, dstMAC net.HardwareAddr, dstIP net.IP, ...) ([]byte, error)
type Addr
- func (a *Addr) Network() string
- func (a *Addr) String() string
type DHCPConn
type RawAddr

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func ListenDHCP ¶

func ListenDHCP(l log.Logger, ip net.IP, iface *net.Interface) (net.PacketConn, error)

ListenDHCP starts listening for DHCP requests on the given IP and interface It opens a UDP and a AF_PACKET socket for communication

func PreparePacket ¶

func PreparePacket(srcMAC net.HardwareAddr, srcIP net.IP, dstMAC net.HardwareAddr, dstIP net.IP, payload []byte) ([]byte, error)

PreparePacket prepares a raw UDP network packet including Ethernet, IP and UDP layers

Types ¶

type Addr ¶

type Addr struct {
	RawAddr
	Local RawAddr
}

Addr is a IPv4 address used to send directed unicasts (i.e. without a prior ARP request). The IP datagram will be sent to the provided MAC address without taking routing considerations into account!

func (*Addr) Network ¶

func (a *Addr) Network() string

Network returns "upd(raw)" and implements net.Addr

func (*Addr) String ¶

func (a *Addr) String() string

String returns a string representation of the peer's address

type DHCPConn ¶

type DHCPConn struct {
	// contains filtered or unexported fields
}

DHCPConn implements net.PacketConn but utilizes a standard UDP and and AF_PACKET socket

func (*DHCPConn) Close ¶

func (p *DHCPConn) Close() error

Close will close both the UDP and the AF_PACKET socket and will return the first error encountered

func (*DHCPConn) LocalAddr ¶

func (p *DHCPConn) LocalAddr() net.Addr

LocalAddr implements the PacketConn interface and returns the local address of the UDP socket

func (*DHCPConn) ReadFrom ¶

func (p *DHCPConn) ReadFrom(b []byte) (int, net.Addr, error)

ReadFrom implements the PacketConn interface and calls ReadFrom on the underlying AF_PACKET socket

func (*DHCPConn) SetDeadline ¶

func (p *DHCPConn) SetDeadline(t time.Time) error

SetDeadline implements the PacketConn interface but is not yet implemented

func (*DHCPConn) SetReadDeadline ¶

func (p *DHCPConn) SetReadDeadline(t time.Time) error

SetReadDeadline implements the PacketConn interface

func (*DHCPConn) SetWriteDeadline ¶

func (p *DHCPConn) SetWriteDeadline(t time.Time) error

SetWriteDeadline implements the PacketConn interface

func (*DHCPConn) WriteTo ¶

func (p *DHCPConn) WriteTo(b []byte, addr net.Addr) (int, error)

WriteTo sends a packet to the given addr. If addr is a *Addr the AF_PACKET socket will be choosen. Otherwise, for e.g. net.UDPAddr, the underlying UDP packet conn will be used. It implements the PacketConn interface

type RawAddr ¶

type RawAddr struct {
	MAC  net.HardwareAddr
	IP   net.IP
	Port uint16 // FIXME: not yet used due to PreparePacket implementation
}

RawAddr implements net.Addr and holds the Ethernet and IP address as well as the TCP/UDP port

Source Files ¶

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