592 lines
16 KiB
Go
592 lines
16 KiB
Go
package sockaddr
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"math/big"
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"net"
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)
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type (
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// IPv6Address is a named type representing an IPv6 address.
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IPv6Address *big.Int
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// IPv6Network is a named type representing an IPv6 network.
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IPv6Network *big.Int
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// IPv6Mask is a named type representing an IPv6 network mask.
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IPv6Mask *big.Int
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)
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// IPv6HostPrefix is a constant represents a /128 IPv6 Prefix.
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const IPv6HostPrefix = IPPrefixLen(128)
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// ipv6HostMask is an unexported big.Int representing a /128 IPv6 address.
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// This value must be a constant and always set to all ones.
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var ipv6HostMask IPv6Mask
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// ipv6AddrAttrMap is a map of the IPv6Addr type-specific attributes.
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var ipv6AddrAttrMap map[AttrName]func(IPv6Addr) string
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var ipv6AddrAttrs []AttrName
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func init() {
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biMask := new(big.Int)
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biMask.SetBytes([]byte{
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0xff, 0xff,
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0xff, 0xff,
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0xff, 0xff,
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0xff, 0xff,
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0xff, 0xff,
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0xff, 0xff,
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0xff, 0xff,
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0xff, 0xff,
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},
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)
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ipv6HostMask = IPv6Mask(biMask)
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ipv6AddrInit()
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}
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// IPv6Addr implements a convenience wrapper around the union of Go's
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// built-in net.IP and net.IPNet types. In UNIX-speak, IPv6Addr implements
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// `sockaddr` when the the address family is set to AF_INET6
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// (i.e. `sockaddr_in6`).
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type IPv6Addr struct {
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IPAddr
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Address IPv6Address
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Mask IPv6Mask
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Port IPPort
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}
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// NewIPv6Addr creates an IPv6Addr from a string. String can be in the form of
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// an an IPv6:port (e.g. `[2001:4860:0:2001::68]:80`, in which case the mask is
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// assumed to be a /128), an IPv6 address (e.g. `2001:4860:0:2001::68`, also
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// with a `/128` mask), an IPv6 CIDR (e.g. `2001:4860:0:2001::68/64`, which has
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// its IP port initialized to zero). ipv6Str can not be a hostname.
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//
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// NOTE: Many net.*() routines will initialize and return an IPv4 address.
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// Always test to make sure the address returned cannot be converted to a 4 byte
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// array using To4().
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func NewIPv6Addr(ipv6Str string) (IPv6Addr, error) {
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v6Addr := false
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LOOP:
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for i := 0; i < len(ipv6Str); i++ {
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switch ipv6Str[i] {
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case '.':
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break LOOP
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case ':':
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v6Addr = true
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break LOOP
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}
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}
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if !v6Addr {
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return IPv6Addr{}, fmt.Errorf("Unable to resolve %+q as an IPv6 address, appears to be an IPv4 address", ipv6Str)
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}
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// Attempt to parse ipv6Str as a /128 host with a port number.
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tcpAddr, err := net.ResolveTCPAddr("tcp6", ipv6Str)
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if err == nil {
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ipv6 := tcpAddr.IP.To16()
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if ipv6 == nil {
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return IPv6Addr{}, fmt.Errorf("Unable to resolve %+q as a 16byte IPv6 address", ipv6Str)
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}
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ipv6BigIntAddr := new(big.Int)
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ipv6BigIntAddr.SetBytes(ipv6)
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ipv6BigIntMask := new(big.Int)
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ipv6BigIntMask.Set(ipv6HostMask)
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ipv6Addr := IPv6Addr{
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Address: IPv6Address(ipv6BigIntAddr),
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Mask: IPv6Mask(ipv6BigIntMask),
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Port: IPPort(tcpAddr.Port),
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}
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return ipv6Addr, nil
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}
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// Parse as a naked IPv6 address. Trim square brackets if present.
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if len(ipv6Str) > 2 && ipv6Str[0] == '[' && ipv6Str[len(ipv6Str)-1] == ']' {
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ipv6Str = ipv6Str[1 : len(ipv6Str)-1]
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}
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ip := net.ParseIP(ipv6Str)
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if ip != nil {
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ipv6 := ip.To16()
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if ipv6 == nil {
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return IPv6Addr{}, fmt.Errorf("Unable to string convert %+q to a 16byte IPv6 address", ipv6Str)
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}
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ipv6BigIntAddr := new(big.Int)
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ipv6BigIntAddr.SetBytes(ipv6)
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ipv6BigIntMask := new(big.Int)
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ipv6BigIntMask.Set(ipv6HostMask)
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return IPv6Addr{
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Address: IPv6Address(ipv6BigIntAddr),
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Mask: IPv6Mask(ipv6BigIntMask),
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}, nil
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}
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// Parse as an IPv6 CIDR
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ipAddr, network, err := net.ParseCIDR(ipv6Str)
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if err == nil {
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ipv6 := ipAddr.To16()
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if ipv6 == nil {
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return IPv6Addr{}, fmt.Errorf("Unable to convert %+q to a 16byte IPv6 address", ipv6Str)
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}
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ipv6BigIntAddr := new(big.Int)
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ipv6BigIntAddr.SetBytes(ipv6)
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ipv6BigIntMask := new(big.Int)
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ipv6BigIntMask.SetBytes(network.Mask)
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ipv6Addr := IPv6Addr{
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Address: IPv6Address(ipv6BigIntAddr),
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Mask: IPv6Mask(ipv6BigIntMask),
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}
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return ipv6Addr, nil
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}
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return IPv6Addr{}, fmt.Errorf("Unable to parse %+q to an IPv6 address: %v", ipv6Str, err)
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}
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// AddressBinString returns a string with the IPv6Addr's Address represented
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// as a sequence of '0' and '1' characters. This method is useful for
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// debugging or by operators who want to inspect an address.
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func (ipv6 IPv6Addr) AddressBinString() string {
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bi := big.Int(*ipv6.Address)
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return fmt.Sprintf("%0128s", bi.Text(2))
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}
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// AddressHexString returns a string with the IPv6Addr address represented as
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// a sequence of hex characters. This method is useful for debugging or by
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// operators who want to inspect an address.
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func (ipv6 IPv6Addr) AddressHexString() string {
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bi := big.Int(*ipv6.Address)
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return fmt.Sprintf("%032s", bi.Text(16))
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}
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// CmpAddress follows the Cmp() standard protocol and returns:
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//
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// - -1 If the receiver should sort first because its address is lower than arg
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// - 0 if the SockAddr arg equal to the receiving IPv6Addr or the argument is of a
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// different type.
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// - 1 If the argument should sort first.
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func (ipv6 IPv6Addr) CmpAddress(sa SockAddr) int {
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ipv6b, ok := sa.(IPv6Addr)
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if !ok {
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return sortDeferDecision
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}
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ipv6aBigInt := new(big.Int)
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ipv6aBigInt.Set(ipv6.Address)
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ipv6bBigInt := new(big.Int)
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ipv6bBigInt.Set(ipv6b.Address)
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return ipv6aBigInt.Cmp(ipv6bBigInt)
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}
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// CmpPort follows the Cmp() standard protocol and returns:
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//
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// - -1 If the receiver should sort first because its port is lower than arg
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// - 0 if the SockAddr arg's port number is equal to the receiving IPv6Addr,
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// regardless of type.
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// - 1 If the argument should sort first.
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func (ipv6 IPv6Addr) CmpPort(sa SockAddr) int {
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var saPort IPPort
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switch v := sa.(type) {
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case IPv4Addr:
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saPort = v.Port
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case IPv6Addr:
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saPort = v.Port
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default:
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return sortDeferDecision
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}
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switch {
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case ipv6.Port == saPort:
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return sortDeferDecision
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case ipv6.Port < saPort:
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return sortReceiverBeforeArg
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default:
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return sortArgBeforeReceiver
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}
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}
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// CmpRFC follows the Cmp() standard protocol and returns:
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//
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// - -1 If the receiver should sort first because it belongs to the RFC and its
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// arg does not
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// - 0 if the receiver and arg both belong to the same RFC or neither do.
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// - 1 If the arg belongs to the RFC but receiver does not.
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func (ipv6 IPv6Addr) CmpRFC(rfcNum uint, sa SockAddr) int {
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recvInRFC := IsRFC(rfcNum, ipv6)
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ipv6b, ok := sa.(IPv6Addr)
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if !ok {
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// If the receiver is part of the desired RFC and the SockAddr
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// argument is not, sort receiver before the non-IPv6 SockAddr.
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// Conversely, if the receiver is not part of the RFC, punt on
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// sorting and leave it for the next sorter.
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if recvInRFC {
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return sortReceiverBeforeArg
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} else {
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return sortDeferDecision
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}
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}
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argInRFC := IsRFC(rfcNum, ipv6b)
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switch {
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case (recvInRFC && argInRFC), (!recvInRFC && !argInRFC):
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// If a and b both belong to the RFC, or neither belong to
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// rfcNum, defer sorting to the next sorter.
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return sortDeferDecision
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case recvInRFC && !argInRFC:
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return sortReceiverBeforeArg
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default:
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return sortArgBeforeReceiver
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}
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}
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// Contains returns true if the SockAddr is contained within the receiver.
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func (ipv6 IPv6Addr) Contains(sa SockAddr) bool {
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ipv6b, ok := sa.(IPv6Addr)
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if !ok {
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return false
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}
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return ipv6.ContainsNetwork(ipv6b)
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}
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// ContainsAddress returns true if the IPv6Address is contained within the
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// receiver.
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func (ipv6 IPv6Addr) ContainsAddress(x IPv6Address) bool {
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xAddr := IPv6Addr{
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Address: x,
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Mask: ipv6HostMask,
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}
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{
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xIPv6 := xAddr.FirstUsable().(IPv6Addr)
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yIPv6 := ipv6.FirstUsable().(IPv6Addr)
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if xIPv6.CmpAddress(yIPv6) >= 1 {
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return false
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}
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}
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{
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xIPv6 := xAddr.LastUsable().(IPv6Addr)
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yIPv6 := ipv6.LastUsable().(IPv6Addr)
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if xIPv6.CmpAddress(yIPv6) <= -1 {
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return false
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}
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}
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return true
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}
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// ContainsNetwork returns true if the network from IPv6Addr is contained within
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// the receiver.
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func (x IPv6Addr) ContainsNetwork(y IPv6Addr) bool {
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{
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xIPv6 := x.FirstUsable().(IPv6Addr)
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yIPv6 := y.FirstUsable().(IPv6Addr)
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if ret := xIPv6.CmpAddress(yIPv6); ret >= 1 {
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return false
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}
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}
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{
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xIPv6 := x.LastUsable().(IPv6Addr)
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yIPv6 := y.LastUsable().(IPv6Addr)
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if ret := xIPv6.CmpAddress(yIPv6); ret <= -1 {
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return false
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}
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}
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return true
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}
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// DialPacketArgs returns the arguments required to be passed to
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// net.DialUDP(). If the Mask of ipv6 is not a /128 or the Port is 0,
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// DialPacketArgs() will fail. See Host() to create an IPv6Addr with its
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// mask set to /128.
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func (ipv6 IPv6Addr) DialPacketArgs() (network, dialArgs string) {
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ipv6Mask := big.Int(*ipv6.Mask)
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if ipv6Mask.Cmp(ipv6HostMask) != 0 || ipv6.Port == 0 {
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return "udp6", ""
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}
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return "udp6", fmt.Sprintf("[%s]:%d", ipv6.NetIP().String(), ipv6.Port)
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}
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// DialStreamArgs returns the arguments required to be passed to
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// net.DialTCP(). If the Mask of ipv6 is not a /128 or the Port is 0,
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// DialStreamArgs() will fail. See Host() to create an IPv6Addr with its
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// mask set to /128.
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func (ipv6 IPv6Addr) DialStreamArgs() (network, dialArgs string) {
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ipv6Mask := big.Int(*ipv6.Mask)
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if ipv6Mask.Cmp(ipv6HostMask) != 0 || ipv6.Port == 0 {
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return "tcp6", ""
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}
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return "tcp6", fmt.Sprintf("[%s]:%d", ipv6.NetIP().String(), ipv6.Port)
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}
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// Equal returns true if a SockAddr is equal to the receiving IPv4Addr.
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func (ipv6a IPv6Addr) Equal(sa SockAddr) bool {
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ipv6b, ok := sa.(IPv6Addr)
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if !ok {
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return false
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}
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if ipv6a.NetIP().String() != ipv6b.NetIP().String() {
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return false
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}
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if ipv6a.NetIPNet().String() != ipv6b.NetIPNet().String() {
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return false
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}
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if ipv6a.Port != ipv6b.Port {
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return false
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}
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return true
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}
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// FirstUsable returns an IPv6Addr set to the first address following the
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// network prefix. The first usable address in a network is normally the
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// gateway and should not be used except by devices forwarding packets
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// between two administratively distinct networks (i.e. a router). This
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// function does not discriminate against first usable vs "first address that
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// should be used." For example, FirstUsable() on "2001:0db8::0003/64" would
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// return "2001:0db8::00011".
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func (ipv6 IPv6Addr) FirstUsable() IPAddr {
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return IPv6Addr{
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Address: IPv6Address(ipv6.NetworkAddress()),
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Mask: ipv6HostMask,
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}
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}
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// Host returns a copy of ipv6 with its mask set to /128 so that it can be
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// used by DialPacketArgs(), DialStreamArgs(), ListenPacketArgs(), or
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// ListenStreamArgs().
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func (ipv6 IPv6Addr) Host() IPAddr {
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// Nothing should listen on a broadcast address.
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return IPv6Addr{
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Address: ipv6.Address,
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Mask: ipv6HostMask,
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Port: ipv6.Port,
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}
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}
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// IPPort returns the Port number attached to the IPv6Addr
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func (ipv6 IPv6Addr) IPPort() IPPort {
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return ipv6.Port
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}
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// LastUsable returns the last address in a given network.
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func (ipv6 IPv6Addr) LastUsable() IPAddr {
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addr := new(big.Int)
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addr.Set(ipv6.Address)
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mask := new(big.Int)
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mask.Set(ipv6.Mask)
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negMask := new(big.Int)
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negMask.Xor(ipv6HostMask, mask)
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lastAddr := new(big.Int)
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lastAddr.And(addr, mask)
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lastAddr.Or(lastAddr, negMask)
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return IPv6Addr{
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Address: IPv6Address(lastAddr),
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Mask: ipv6HostMask,
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}
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}
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// ListenPacketArgs returns the arguments required to be passed to
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// net.ListenUDP(). If the Mask of ipv6 is not a /128, ListenPacketArgs()
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// will fail. See Host() to create an IPv6Addr with its mask set to /128.
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func (ipv6 IPv6Addr) ListenPacketArgs() (network, listenArgs string) {
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ipv6Mask := big.Int(*ipv6.Mask)
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if ipv6Mask.Cmp(ipv6HostMask) != 0 {
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return "udp6", ""
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}
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return "udp6", fmt.Sprintf("[%s]:%d", ipv6.NetIP().String(), ipv6.Port)
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}
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// ListenStreamArgs returns the arguments required to be passed to
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// net.ListenTCP(). If the Mask of ipv6 is not a /128, ListenStreamArgs()
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// will fail. See Host() to create an IPv6Addr with its mask set to /128.
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func (ipv6 IPv6Addr) ListenStreamArgs() (network, listenArgs string) {
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ipv6Mask := big.Int(*ipv6.Mask)
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if ipv6Mask.Cmp(ipv6HostMask) != 0 {
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return "tcp6", ""
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}
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return "tcp6", fmt.Sprintf("[%s]:%d", ipv6.NetIP().String(), ipv6.Port)
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}
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// Maskbits returns the number of network mask bits in a given IPv6Addr. For
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// example, the Maskbits() of "2001:0db8::0003/64" would return 64.
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func (ipv6 IPv6Addr) Maskbits() int {
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maskOnes, _ := ipv6.NetIPNet().Mask.Size()
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return maskOnes
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}
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// MustIPv6Addr is a helper method that must return an IPv6Addr or panic on
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// invalid input.
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func MustIPv6Addr(addr string) IPv6Addr {
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ipv6, err := NewIPv6Addr(addr)
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if err != nil {
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panic(fmt.Sprintf("Unable to create an IPv6Addr from %+q: %v", addr, err))
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}
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return ipv6
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}
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// NetIP returns the address as a net.IP.
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func (ipv6 IPv6Addr) NetIP() *net.IP {
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return bigIntToNetIPv6(ipv6.Address)
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}
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// NetIPMask create a new net.IPMask from the IPv6Addr.
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func (ipv6 IPv6Addr) NetIPMask() *net.IPMask {
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ipv6Mask := make(net.IPMask, IPv6len)
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m := big.Int(*ipv6.Mask)
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copy(ipv6Mask, m.Bytes())
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return &ipv6Mask
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}
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// Network returns a pointer to the net.IPNet within IPv4Addr receiver.
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func (ipv6 IPv6Addr) NetIPNet() *net.IPNet {
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ipv6net := &net.IPNet{}
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ipv6net.IP = make(net.IP, IPv6len)
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copy(ipv6net.IP, *ipv6.NetIP())
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ipv6net.Mask = *ipv6.NetIPMask()
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return ipv6net
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}
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// Network returns the network prefix or network address for a given network.
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func (ipv6 IPv6Addr) Network() IPAddr {
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return IPv6Addr{
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Address: IPv6Address(ipv6.NetworkAddress()),
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Mask: ipv6.Mask,
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}
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}
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// NetworkAddress returns an IPv6Network of the IPv6Addr's network address.
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func (ipv6 IPv6Addr) NetworkAddress() IPv6Network {
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addr := new(big.Int)
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addr.SetBytes((*ipv6.Address).Bytes())
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mask := new(big.Int)
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mask.SetBytes(*ipv6.NetIPMask())
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netAddr := new(big.Int)
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netAddr.And(addr, mask)
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return IPv6Network(netAddr)
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}
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// Octets returns a slice of the 16 octets in an IPv6Addr's Address. The
|
|
// order of the bytes is big endian.
|
|
func (ipv6 IPv6Addr) Octets() []int {
|
|
x := make([]int, IPv6len)
|
|
for i, b := range *bigIntToNetIPv6(ipv6.Address) {
|
|
x[i] = int(b)
|
|
}
|
|
|
|
return x
|
|
}
|
|
|
|
// String returns a string representation of the IPv6Addr
|
|
func (ipv6 IPv6Addr) String() string {
|
|
if ipv6.Port != 0 {
|
|
return fmt.Sprintf("[%s]:%d", ipv6.NetIP().String(), ipv6.Port)
|
|
}
|
|
|
|
if ipv6.Maskbits() == 128 {
|
|
return ipv6.NetIP().String()
|
|
}
|
|
|
|
return fmt.Sprintf("%s/%d", ipv6.NetIP().String(), ipv6.Maskbits())
|
|
}
|
|
|
|
// Type is used as a type switch and returns TypeIPv6
|
|
func (IPv6Addr) Type() SockAddrType {
|
|
return TypeIPv6
|
|
}
|
|
|
|
// IPv6Attrs returns a list of attributes supported by the IPv6Addr type
|
|
func IPv6Attrs() []AttrName {
|
|
return ipv6AddrAttrs
|
|
}
|
|
|
|
// IPv6AddrAttr returns a string representation of an attribute for the given
|
|
// IPv6Addr.
|
|
func IPv6AddrAttr(ipv6 IPv6Addr, selector AttrName) string {
|
|
fn, found := ipv6AddrAttrMap[selector]
|
|
if !found {
|
|
return ""
|
|
}
|
|
|
|
return fn(ipv6)
|
|
}
|
|
|
|
// ipv6AddrInit is called once at init()
|
|
func ipv6AddrInit() {
|
|
// Sorted for human readability
|
|
ipv6AddrAttrs = []AttrName{
|
|
"size", // Same position as in IPv6 for output consistency
|
|
"uint128",
|
|
}
|
|
|
|
ipv6AddrAttrMap = map[AttrName]func(ipv6 IPv6Addr) string{
|
|
"size": func(ipv6 IPv6Addr) string {
|
|
netSize := big.NewInt(1)
|
|
netSize = netSize.Lsh(netSize, uint(IPv6len*8-ipv6.Maskbits()))
|
|
return netSize.Text(10)
|
|
},
|
|
"uint128": func(ipv6 IPv6Addr) string {
|
|
b := big.Int(*ipv6.Address)
|
|
return b.Text(10)
|
|
},
|
|
}
|
|
}
|
|
|
|
// bigIntToNetIPv6 is a helper function that correctly returns a net.IP with the
|
|
// correctly padded values.
|
|
func bigIntToNetIPv6(bi *big.Int) *net.IP {
|
|
x := make(net.IP, IPv6len)
|
|
ipv6Bytes := bi.Bytes()
|
|
|
|
// It's possibe for ipv6Bytes to be less than IPv6len bytes in size. If
|
|
// they are different sizes we to pad the size of response.
|
|
if len(ipv6Bytes) < IPv6len {
|
|
buf := new(bytes.Buffer)
|
|
buf.Grow(IPv6len)
|
|
|
|
for i := len(ipv6Bytes); i < IPv6len; i++ {
|
|
if err := binary.Write(buf, binary.BigEndian, byte(0)); err != nil {
|
|
panic(fmt.Sprintf("Unable to pad byte %d of input %v: %v", i, bi, err))
|
|
}
|
|
}
|
|
|
|
for _, b := range ipv6Bytes {
|
|
if err := binary.Write(buf, binary.BigEndian, b); err != nil {
|
|
panic(fmt.Sprintf("Unable to preserve endianness of input %v: %v", bi, err))
|
|
}
|
|
}
|
|
|
|
ipv6Bytes = buf.Bytes()
|
|
}
|
|
i := copy(x, ipv6Bytes)
|
|
if i != IPv6len {
|
|
panic("IPv6 wrong size")
|
|
}
|
|
return &x
|
|
}
|