package network import ( "fmt" "net" "strings" "github.com/multiformats/go-multiaddr" manet "github.com/multiformats/go-multiaddr/net" ) /* HostAddr strings: "localhost:8080", ":8080", "192.168.0.1:8080" MultiAddr strings: "/dns4/localhost/tcp/8080", "/ip4/192.168.0.1/tcp/8080" IPAddr strings: "192.168.0.1:8080" */ // Address represents the NeoFS node // network address. type Address struct { ma multiaddr.Multiaddr } // LocalAddressSource is an interface of local // network address container with read access. type LocalAddressSource interface { LocalAddress() *Address } // String returns multiaddr string. func (a Address) String() string { return a.ma.String() } // Equal compares Address's. func (a Address) Equal(addr Address) bool { return a.ma.Equal(addr.ma) } // HostAddr returns host address in string format. // // Panics if host address cannot be fetched from Address. func (a Address) HostAddr() string { _, host, err := manet.DialArgs(a.ma) if err != nil { // the only correct way to construct Address is AddressFromString // which makes this error appear unexpected panic(fmt.Errorf("could not get host addr: %w", err)) } return host } // AddressFromString restores address from a string representation. // // Supports MultiAddr and HostAddr strings. func AddressFromString(s string) (*Address, error) { ma, err := multiaddr.NewMultiaddr(s) if err != nil { s, err = multiaddrStringFromHostAddr(s) if err != nil { return nil, err } ma, err = multiaddr.NewMultiaddr(s) // don't want recursion there if err != nil { return nil, err } } return &Address{ ma: ma, }, nil } // multiaddrStringFromHostAddr converts "localhost:8080" to "/dns4/localhost/tcp/8080" func multiaddrStringFromHostAddr(host string) (string, error) { endpoint, port, err := net.SplitHostPort(host) if err != nil { return "", err } // Empty address in host `:8080` generates `/dns4//tcp/8080` multiaddr // which is invalid. It could be `/tcp/8080` but this breaks // `manet.DialArgs`. The solution is to manually parse it as 0.0.0.0 if endpoint == "" { return "/ip4/0.0.0.0/tcp/" + port, nil } var ( prefix = "/dns4" addr = endpoint ) if ip := net.ParseIP(endpoint); ip != nil { addr = ip.String() if ip.To4() == nil { prefix = "/ip6" } else { prefix = "/ip4" } } const l4Protocol = "tcp" return strings.Join([]string{prefix, addr, l4Protocol, port}, "/"), nil } // IsLocalAddress returns true if network endpoint from local address // source is equal to network endpoint of passed address. func IsLocalAddress(src LocalAddressSource, addr Address) bool { return src.LocalAddress().Equal(addr) }