146 lines
3.4 KiB
Go
146 lines
3.4 KiB
Go
package network
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import (
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"fmt"
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"net"
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"strings"
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"github.com/multiformats/go-multiaddr"
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manet "github.com/multiformats/go-multiaddr/net"
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)
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/*
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HostAddr strings: "localhost:8080", ":8080", "192.168.0.1:8080"
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MultiAddr strings: "/dns4/localhost/tcp/8080", "/ip4/192.168.0.1/tcp/8080"
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IPAddr strings: "192.168.0.1:8080"
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*/
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const (
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L4Protocol = "tcp"
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)
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// Address represents the NeoFS node
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// network address.
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type Address struct {
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ma multiaddr.Multiaddr
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}
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// LocalAddressSource is an interface of local
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// network address container with read access.
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type LocalAddressSource interface {
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LocalAddress() *Address
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}
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// Encapsulate wraps this Address around another. For example:
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//
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// /ip4/1.2.3.4 encapsulate /tcp/80 = /ip4/1.2.3.4/tcp/80
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//
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func (a *Address) Encapsulate(addr *Address) {
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a.ma = a.ma.Encapsulate(addr.ma)
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}
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// Decapsulate removes an Address wrapping. For example:
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//
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// /ip4/1.2.3.4/tcp/80 decapsulate /ip4/1.2.3.4 = /tcp/80
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//
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func (a *Address) Decapsulate(addr *Address) {
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a.ma = a.ma.Decapsulate(addr.ma)
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}
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// String returns multiaddr string
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func (a Address) String() string {
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return a.ma.String()
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}
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// Equal compares Address's.
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func (a Address) Equal(addr *Address) bool {
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return a.ma.Equal(addr.ma)
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}
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// IPAddrString returns network endpoint address in string format.
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func (a Address) IPAddrString() (string, error) {
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ip, err := manet.ToNetAddr(a.ma)
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if err != nil {
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return "", fmt.Errorf("could not get net addr: %w", err)
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}
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return ip.String(), nil
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}
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// HostAddrString returns host address in string format.
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func (a Address) HostAddrString() (string, error) {
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_, host, err := manet.DialArgs(a.ma)
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if err != nil {
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return "", fmt.Errorf("could not get host addr: %w", err)
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}
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return host, nil
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}
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// AddressFromString restores address from a multiaddr string representation.
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func AddressFromString(s string) (*Address, error) {
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ma, err := multiaddr.NewMultiaddr(s)
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if err != nil {
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s, err = multiaddrStringFromHostAddr(s)
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if err != nil {
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return nil, err
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}
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ma, err = multiaddr.NewMultiaddr(s) // don't want recursion there
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if err != nil {
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return nil, err
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}
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}
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return &Address{
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ma: ma,
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}, nil
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}
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// multiaddrStringFromHostAddr converts "localhost:8080" to "/dns4/localhost/tcp/8080"
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func multiaddrStringFromHostAddr(host string) (string, error) {
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endpoint, port, err := net.SplitHostPort(host)
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if err != nil {
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return "", err
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}
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// Empty address in host `:8080` generates `/dns4//tcp/8080` multiaddr
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// which is invalid. It could be `/tcp/8080` but this breaks
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// `manet.DialArgs`. The solution is to manually parse it as 0.0.0.0
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if endpoint == "" {
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return "/ip4/0.0.0.0/tcp/" + port, nil
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}
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var (
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prefix = "/dns4"
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addr = endpoint
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)
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if ip := net.ParseIP(endpoint); ip != nil {
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addr = ip.String()
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if ip.To4() == nil {
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prefix = "/ip6"
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} else {
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prefix = "/ip4"
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}
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}
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return strings.Join([]string{prefix, addr, L4Protocol, port}, "/"), nil
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}
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// IsLocalAddress returns true if network endpoint from local address
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// source is equal to network endpoint of passed address.
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func IsLocalAddress(src LocalAddressSource, addr *Address) bool {
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return src.LocalAddress().ma.Equal(addr.ma)
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}
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// HostAddrFromMultiaddr converts "/dns4/localhost/tcp/8080" to "localhost:8080".
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func HostAddrFromMultiaddr(multiaddr string) (string, error) {
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address, err := AddressFromString(multiaddr)
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if err != nil {
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return "", err
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}
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return address.HostAddrString()
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}
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