util

Documentation

Index

• Constants
• Variables
• func GetNodeAddresses(cidrs []string, nw NetworkInterfacer) (sets.String, error)
• func IPPart(s string) string
• func IsLocalIP(ip string) (bool, error)
• func IsProxyableHostname(ctx context.Context, resolv Resolver, hostname string) error
• func IsProxyableIP(ip string) error
• func IsZeroCIDR(cidr string) bool
• func LogAndEmitIncorrectIPVersionEvent(recorder record.EventRecorder, ...)
• func PortPart(s string) (int, error)
• func RevertPorts(replacementPortsMap, originalPortsMap map[LocalPort]Closeable)
• func ShouldSkipService(svcName types.NamespacedName, service *v1.Service) bool
• func ToCIDR(ip net.IP) string
• type Closeable
• type LocalPort
  • func (lp *LocalPort) String() string
• type NetworkInterfacer
• type PortOpener
• type RealNetwork
  • func (_ RealNetwork) Addrs(intf *net.Interface) ([]net.Addr, error)
  • func (_ RealNetwork) Interfaces() ([]net.Interface, error)
• type Resolver

Constants

const (
	IPv4ZeroCIDR = "0.0.0.0/0"
	IPv6ZeroCIDR = "::/0"
)

Variables

var (
	ErrAddressNotAllowed = errors.New("address not allowed")
	ErrNoAddresses       = errors.New("No addresses for hostname")
)

Functions

func GetNodeAddresses

func GetNodeAddresses(cidrs []string, nw NetworkInterfacer) (sets.String, error)

GetNodeAddresses return all matched node IP addresses based on given cidr slice. Some callers, e.g. IPVS proxier, need concrete IPs, not ranges, which is why this exists. NetworkInterfacer is injected for test purpose. We expect the cidrs passed in is already validated. Given an empty input `[]`, it will return `0.0.0.0/0` and `::/0` directly. If multiple cidrs is given, it will return the minimal IP sets, e.g. given input `[1.2.0.0/16, 0.0.0.0/0]`, it will only return `0.0.0.0/0`. NOTE: GetNodeAddresses only accepts CIDRs, if you want concrete IPs, e.g. 1.2.3.4, then the input should be 1.2.3.4/32.

func IPPart

func IPPart(s string) string

IPPart returns just the IP part of an IP or IP:port or endpoint string. If the IP part is an IPv6 address enclosed in brackets (e.g. "[fd00:1::5]:9999"), then the brackets are stripped as well.

func IsLocalIP

func IsLocalIP(ip string) (bool, error)

func IsProxyableHostname

func IsProxyableHostname(ctx context.Context, resolv Resolver, hostname string) error

IsProxyableHostname checks if the IP addresses for a given hostname are permitted to be proxied

func IsProxyableIP

func IsProxyableIP(ip string) error

IsProxyableIP checks if a given IP address is permitted to be proxied

func IsZeroCIDR

func IsZeroCIDR(cidr string) bool

func LogAndEmitIncorrectIPVersionEvent

func LogAndEmitIncorrectIPVersionEvent(recorder record.EventRecorder, fieldName, fieldValue, svcNamespace, svcName string, svcUID types.UID)

LogAndEmitIncorrectIPVersionEvent logs and emits incorrect IP version event.

func PortPart

func PortPart(s string) (int, error)

PortPart returns just the port part of an endpoint string.

func RevertPorts

func RevertPorts(replacementPortsMap, originalPortsMap map[LocalPort]Closeable)

RevertPorts is closing ports in replacementPortsMap but not in originalPortsMap. In other words, it only closes the ports opened in this sync.

func ShouldSkipService

func ShouldSkipService(svcName types.NamespacedName, service *v1.Service) bool

func ToCIDR

func ToCIDR(ip net.IP) string

ToCIDR returns a host address of the form <ip-address>/32 for IPv4 and <ip-address>/128 for IPv6

Types

type Closeable

type Closeable interface {
	Close() error
}

Closeable is an interface around closing a port.

type LocalPort

type LocalPort struct {
	// Description is the identity message of a given local port.
	Description string
	// IP is the IP address part of a given local port.
	// If this string is empty, the port binds to all local IP addresses.
	IP string
	// Port is the port part of a given local port.
	Port int
	// Protocol is the protocol part of a given local port.
	// The value is assumed to be lower-case. For example, "udp" not "UDP", "tcp" not "TCP".
	Protocol string
}

LocalPort describes a port on specific IP address and protocol

func (*LocalPort) String

func (lp *LocalPort) String() string

type NetworkInterfacer

type NetworkInterfacer interface {
	Addrs(intf *net.Interface) ([]net.Addr, error)
	Interfaces() ([]net.Interface, error)
}

NetworkInterfacer defines an interface for several net library functions. Production code will forward to net library functions, and unit tests will override the methods for testing purposes.

type PortOpener

type PortOpener interface {
	OpenLocalPort(lp *LocalPort) (Closeable, error)
}

PortOpener is an interface around port opening/closing. Abstracted out for testing.

type RealNetwork

type RealNetwork struct{}

RealNetwork implements the NetworkInterfacer interface for production code, just wrapping the underlying net library function calls.

func (RealNetwork) Addrs

func (_ RealNetwork) Addrs(intf *net.Interface) ([]net.Addr, error)

Addrs wraps net.Interface.Addrs(), it's a part of NetworkInterfacer interface.

func (RealNetwork) Interfaces

func (_ RealNetwork) Interfaces() ([]net.Interface, error)

Interfaces wraps net.Interfaces(), it's a part of NetworkInterfacer interface.

type Resolver

type Resolver interface {
	LookupIPAddr(ctx context.Context, host string) ([]net.IPAddr, error)
}

Resolver is an interface for net.Resolver