util

Documentation

Index

• Constants
• Variables
• func AppendPortIfNeeded(addr string, port int32) string
• func BuildPortsToEndpointsMap(endpoints *v1.Endpoints) map[string][]string
• func CountBytesLines(b []byte) int
• func EnsureSysctl(sysctl utilsysctl.Interface, name string, newVal int) error
• func GetClusterIPByFamily(ipFamily v1.IPFamily, service *v1.Service) string
• func GetLocalAddrSet() utilnet.IPSet
• func GetLocalAddrs() ([]net.IP, error)
• func GetNodeAddresses(cidrs []string, nw NetworkInterfacer) (sets.String, error)
• func IPPart(s string) string
• func IsAllowedHost(host net.IP, denied []*net.IPNet) 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 MapCIDRsByIPFamily(cidrStrings []string) map[v1.IPFamily][]string
• func MapIPsByIPFamily(ipStrings []string) map[v1.IPFamily][]string
• func OtherIPFamily(ipFamily v1.IPFamily) v1.IPFamily
• func PortPart(s string) (int, error)
• func RevertPorts(replacementPortsMap, originalPortsMap map[utilnet.LocalPort]utilnet.Closeable)
• func ShouldSkipService(service *v1.Service) bool
• func ShuffleStrings(s []string) []string
• func ToCIDR(ip net.IP) string
• func WriteBytesLine(buf *bytes.Buffer, bytes []byte)
• func WriteLine(buf *bytes.Buffer, words ...string)
• func WriteRuleLine(buf *bytes.Buffer, chainName string, words ...string)
• type DialContext
  • func NewFilteredDialContext(wrapped DialContext, resolv Resolver, opts *FilteredDialOptions) DialContext
• type FilteredDialOptions
• type NetworkInterfacer
• type RealNetwork
  • func (RealNetwork) Addrs(intf *net.Interface) ([]net.Addr, error)
  • func (RealNetwork) Interfaces() ([]net.Interface, error)
• type Resolver

Constants

const (
	// IPv4ZeroCIDR is the CIDR block for the whole IPv4 address space
	IPv4ZeroCIDR = "0.0.0.0/0"

	// IPv6ZeroCIDR is the CIDR block for the whole IPv6 address space
	IPv6ZeroCIDR = "::/0"
)

Variables

var (
	// ErrAddressNotAllowed indicates the address is not allowed
	ErrAddressNotAllowed = errors.New("address not allowed")

	// ErrNoAddresses indicates there are no addresses for the hostname
	ErrNoAddresses = errors.New("No addresses for hostname")
)

Functions

func AppendPortIfNeeded

func AppendPortIfNeeded(addr string, port int32) string

AppendPortIfNeeded appends the given port to IP address unless it is already in "ipv4:port" or "[ipv6]:port" format.

func BuildPortsToEndpointsMap

func BuildPortsToEndpointsMap(endpoints *v1.Endpoints) map[string][]string

BuildPortsToEndpointsMap builds a map of portname -> all ip:ports for that portname. Explode Endpoints.Subsets[*] into this structure.

func CountBytesLines

func CountBytesLines(b []byte) int

CountBytesLines counts the number of lines in a bytes slice

func EnsureSysctl

func EnsureSysctl(sysctl utilsysctl.Interface, name string, newVal int) error

EnsureSysctl sets a kernel sysctl to a given numeric value.

func GetClusterIPByFamily

func GetClusterIPByFamily(ipFamily v1.IPFamily, service *v1.Service) string

GetClusterIPByFamily returns a service clusterip by family

func GetLocalAddrSet

func GetLocalAddrSet() utilnet.IPSet

GetLocalAddrSet return a local IPSet. If failed to get local addr, will assume no local ips.

func GetLocalAddrs

func GetLocalAddrs() ([]net.IP, error)

GetLocalAddrs returns a list of all network addresses on the local system

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 IsAllowedHost

func IsAllowedHost(host net.IP, denied []*net.IPNet) error

IsAllowedHost checks if the given IP host address is in a network in the denied list.

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

IsZeroCIDR checks whether the input CIDR string is either the IPv4 or IPv6 zero CIDR

func LogAndEmitIncorrectIPVersionEvent

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

LogAndEmitIncorrectIPVersionEvent logs and emits incorrect IP version event.

func MapCIDRsByIPFamily

func MapCIDRsByIPFamily(cidrStrings []string) map[v1.IPFamily][]string

MapCIDRsByIPFamily maps a slice of IPs to their respective IP families (v4 or v6)

func MapIPsByIPFamily

func MapIPsByIPFamily(ipStrings []string) map[v1.IPFamily][]string

MapIPsByIPFamily maps a slice of IPs to their respective IP families (v4 or v6)

func OtherIPFamily

func OtherIPFamily(ipFamily v1.IPFamily) v1.IPFamily

OtherIPFamily returns the other ip family

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[utilnet.LocalPort]utilnet.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(service *v1.Service) bool

ShouldSkipService checks if a given service should skip proxying

func ShuffleStrings

func ShuffleStrings(s []string) []string

ShuffleStrings copies strings from the specified slice into a copy in random order. It returns a new slice.

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

func WriteBytesLine

func WriteBytesLine(buf *bytes.Buffer, bytes []byte)

WriteBytesLine write bytes to buffer, terminate with newline

func WriteLine

func WriteLine(buf *bytes.Buffer, words ...string)

WriteLine join all words with spaces, terminate with newline and write to buff.

func WriteRuleLine

func WriteRuleLine(buf *bytes.Buffer, chainName string, words ...string)

WriteRuleLine prepends the strings "-A" and chainName to the buffer and calls WriteLine to join all the words into the buffer and terminate with newline.

Types

type DialContext

type DialContext = func(context.Context, string, string) (net.Conn, error)

DialContext is a dial function matching the signature of net.Dialer.DialContext.

func NewFilteredDialContext

func NewFilteredDialContext(wrapped DialContext, resolv Resolver, opts *FilteredDialOptions) DialContext

NewFilteredDialContext returns a DialContext function that filters connections based on a FilteredDialOptions.

type FilteredDialOptions

type FilteredDialOptions struct {
	// DialHostIPDenylist restricts hosts from being dialed.
	DialHostCIDRDenylist []*net.IPNet
	// AllowLocalLoopback controls connections to local loopback hosts (as defined by
	// IsProxyableIP).
	AllowLocalLoopback bool
}

FilteredDialOptions configures how a DialContext is wrapped by NewFilteredDialContext.

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 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