net

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 Go to latest Published: Feb 9, 2021 License: Apache-2.0 Imports: 7 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source 
var ListenPortOpener listenPortOpener

ListenPortOpener opens ports by calling bind() and listen().

Functions

func AddIPOffset 

func AddIPOffset(base *big.Int, offset int) net.IP

AddIPOffset adds the provided integer offset to a base big.Int representing a net.IP NOTE: If you started with a v4 address and overflow it, you get a v6 result.

func BigForIP 

func BigForIP(ip net.IP) *big.Int

BigForIP creates a big.Int based on the provided net.IP

func GetIndexedIP 

func GetIndexedIP(subnet *net.IPNet, index int) (net.IP, error)

GetIndexedIP returns a net.IP that is subnet.IP + index in the contiguous IP space.

func IsDualStackCIDRStrings 

func IsDualStackCIDRStrings(cidrs []string) (bool, error)

IsDualStackCIDRStrings returns if - all are valid cidrs - at least one cidr from each family (v4 or v6)

func IsDualStackCIDRs 

func IsDualStackCIDRs(cidrs []*net.IPNet) (bool, error)

IsDualStackCIDRs returns if - all are valid cidrs - at least one cidr from each family (v4 or v6)

func IsDualStackIPStrings 

func IsDualStackIPStrings(ips []string) (bool, error)

IsDualStackIPStrings returns if - all are valid ips - at least one ip from each family (v4 or v6)

func IsDualStackIPs 

func IsDualStackIPs(ips []net.IP) (bool, error)

IsDualStackIPs returns if a slice of ips is: - all are valid ips - at least one ip from each family (v4 or v6)

func IsIPv4 

func IsIPv4(netIP net.IP) bool

IsIPv4 returns if netIP is IPv4.

func IsIPv4CIDR 

func IsIPv4CIDR(cidr *net.IPNet) bool

IsIPv4CIDR returns if a cidr is ipv4

func IsIPv4CIDRString 

func IsIPv4CIDRString(cidr string) bool

IsIPv4CIDRString returns if cidr is IPv4. This assumes cidr is a valid CIDR.

func IsIPv4String 

func IsIPv4String(ip string) bool

IsIPv4String returns if ip is IPv4.

func IsIPv6 

func IsIPv6(netIP net.IP) bool

IsIPv6 returns if netIP is IPv6.

func IsIPv6CIDR 

func IsIPv6CIDR(cidr *net.IPNet) bool

IsIPv6CIDR returns if a cidr is ipv6

func IsIPv6CIDRString 

func IsIPv6CIDRString(cidr string) bool

IsIPv6CIDRString returns if cidr is IPv6. This assumes cidr is a valid CIDR.

func IsIPv6String 

func IsIPv6String(ip string) bool

IsIPv6String returns if ip is IPv6.

func ParseCIDRs 

func ParseCIDRs(cidrsString []string) ([]*net.IPNet, error)

ParseCIDRs parses a list of cidrs and return error if any is invalid. order is maintained

func ParsePort 

func ParsePort(port string, allowZero bool) (int, error)

ParsePort parses a string representing an IP port. If the string is not a valid port number, this returns an error.

func RangeSize 

func RangeSize(subnet *net.IPNet) int64

RangeSize returns the size of a range in valid addresses. returns the size of the subnet (or math.MaxInt64 if the range size would overflow int64)

Types

type Closeable 

type Closeable interface {
	Close() error
}

Closeable closes an opened LocalPort.

type IPFamily 

type IPFamily string

IPFamily refers to a specific family if not empty, i.e. "4" or "6". 

const (
	IPv4 IPFamily = "4"
	IPv6          = "6"
)

Constants for valid IPFamilys:

type IPNetSet 

type IPNetSet map[string]*net.IPNet

IPNetSet maps string to net.IPNet.

func ParseIPNets 

func ParseIPNets(specs ...string) (IPNetSet, error)

ParseIPNets parses string slice to IPNetSet.

func (IPNetSet) Delete 

func (s IPNetSet) Delete(items ...*net.IPNet)

Delete removes all items from the set.

func (IPNetSet) Difference 

func (s IPNetSet) Difference(s2 IPNetSet) IPNetSet

Difference returns a set of objects that are not in s2 For example: s1 = {a1, a2, a3} s2 = {a1, a2, a4, a5} s1.Difference(s2) = {a3} s2.Difference(s1) = {a4, a5}

func (IPNetSet) Equal 

func (s IPNetSet) Equal(s2 IPNetSet) bool

Equal returns true if and only if s1 is equal (as a set) to s2. Two sets are equal if their membership is identical. (In practice, this means same elements, order doesn't matter)

func (IPNetSet) Has 

func (s IPNetSet) Has(item *net.IPNet) bool

Has returns true if and only if item is contained in the set.

func (IPNetSet) HasAll 

func (s IPNetSet) HasAll(items ...*net.IPNet) bool

HasAll returns true if and only if all items are contained in the set.

func (IPNetSet) Insert 

func (s IPNetSet) Insert(items ...*net.IPNet)

Insert adds items to the set.

func (IPNetSet) IsSuperset 

func (s IPNetSet) IsSuperset(s2 IPNetSet) bool

IsSuperset returns true if and only if s1 is a superset of s2.

func (IPNetSet) Len 

func (s IPNetSet) Len() int

Len returns the size of the set.

func (IPNetSet) StringSlice 

func (s IPNetSet) StringSlice() []string

StringSlice returns a []string with the String representation of each element in the set. Order is undefined.

type IPSet 

type IPSet map[string]net.IP

IPSet maps string to net.IP

func ParseIPSet 

func ParseIPSet(items ...string) (IPSet, error)

ParseIPSet parses string slice to IPSet

func (IPSet) Delete 

func (s IPSet) Delete(items ...net.IP)

Delete removes all items from the set.

func (IPSet) Difference 

func (s IPSet) Difference(s2 IPSet) IPSet

Difference returns a set of objects that are not in s2 For example: s1 = {a1, a2, a3} s2 = {a1, a2, a4, a5} s1.Difference(s2) = {a3} s2.Difference(s1) = {a4, a5}

func (IPSet) Equal 

func (s IPSet) Equal(s2 IPSet) bool

Equal returns true if and only if s1 is equal (as a set) to s2. Two sets are equal if their membership is identical. (In practice, this means same elements, order doesn't matter)

func (IPSet) Has 

func (s IPSet) Has(item net.IP) bool

Has returns true if and only if item is contained in the set.

func (IPSet) HasAll 

func (s IPSet) HasAll(items ...net.IP) bool

HasAll returns true if and only if all items are contained in the set.

func (IPSet) Insert 

func (s IPSet) Insert(items ...net.IP)

Insert adds items to the set.

func (IPSet) IsSuperset 

func (s IPSet) IsSuperset(s2 IPSet) bool

IsSuperset returns true if and only if s1 is a superset of s2.

func (IPSet) Len 

func (s IPSet) Len() int

Len returns the size of the set.

func (IPSet) StringSlice 

func (s IPSet) StringSlice() []string

StringSlice returns a []string with the String representation of each element in the set. Order is undefined.

type LocalPort 

type LocalPort struct {
	// Description is an arbitrary string.
	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
	// If IPFamily is not empty, the port binds only to addresses of this
	// family.
	// IF empty along with IP, bind to local addresses of any family.
	IPFamily IPFamily
	// Port is the port number.
	// A value of 0 causes a port to be automatically chosen.
	Port int
	// Protocol is the protocol, e.g. TCP
	Protocol Protocol
}

LocalPort represents an IP address and port pair along with a protocol and potentially a specific IP family. A LocalPort can be opened and subsequently closed.

func NewLocalPort 

func NewLocalPort(desc, ip string, ipFamily IPFamily, port int, protocol Protocol) (*LocalPort, error)

NewLocalPort returns a LocalPort instance and ensures IPFamily and IP are consistent and that the given protocol is valid.

func (*LocalPort) String 

func (lp *LocalPort) String() string

type PortOpener 

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

PortOpener can open a LocalPort and allows later closing it.

type Protocol 

type Protocol string

Protocol is a network protocol support by LocalPort. 

const (
	TCP Protocol = "TCP"
	UDP Protocol = "UDP"
)

Constants for valid protocols:

Source Files

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