frostfs-node/pkg/network/validation.go

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package network
import (
"errors"
"fmt"
"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
)
const (
// maxProtocolsAmount is maximal amount of protocols
// in multiaddress after parsing with network.AddressFromString
maxProtocolsAmount = 3
// minProtocolsAmount is minimal amount of protocols
// in multiaddress after parsing with network.AddressFromString:
// host(ip) and port.
minProtocolsAmount = 2
// network protocols
dns, ip4, ip6 = "dns4", "ip4", "ip6"
// transport protocols
tcp = "tcp"
)
var (
errIncorrectProtocolAmount = errors.New("numbers of protocols in multiaddress incorrect")
errUnsupportedNetworkProtocol = errors.New("unsupported network protocol in multiaddress")
errUnsupportedTransportProtocol = errors.New("unsupported transport protocol in multiaddress")
errUnsupportedPresentationProtocol = errors.New("unsupported presentation protocol in multiaddress")
)
// VerifyMultiAddress validates multiaddress of n.
//
// If n's address contains more than 3 protocols
// or less than 2 protocols an error returns.
//
// If n's address's protocol order is incorrect
// an error returns.
//
// Correct composition(and order from low to high level)
// of protocols:
//
// 1. dns4/ip4/ip6
// 2. tcp
// 3. tls(optional, may be absent)
//
func VerifyMultiAddress(ni *netmap.NodeInfo) error {
// check if it can be parsed to network.Address
var netAddr Address
err := netAddr.FromString(ni.Address())
if err != nil {
return fmt.Errorf("could not parse multiaddr from NodeInfo: %w", err)
}
// check amount of protocols and its order
return checkProtocols(netAddr)
}
func checkProtocols(a Address) error {
pp := a.ma.Protocols()
parsedProtocolsAmount := len(pp)
if parsedProtocolsAmount > maxProtocolsAmount || parsedProtocolsAmount < minProtocolsAmount {
return errIncorrectProtocolAmount
}
switch pp[0].Name {
case dns, ip4, ip6:
default:
return errUnsupportedNetworkProtocol
}
if pp[1].Name != tcp {
return errUnsupportedTransportProtocol
}
if parsedProtocolsAmount != minProtocolsAmount {
if pp[2].Name != tlsProtocolName {
return errUnsupportedPresentationProtocol
}
}
return nil
}