frostfs-node/pkg/network/validation.go

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package network
import (
"errors"
"github.com/TrueCloudLab/frostfs-sdk-go/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")
)
// NodeEndpointsIterator is a wrapper over netmap.NodeInfo which implements
// MultiAddressIterator.
type NodeEndpointsIterator netmap.NodeInfo
func (x NodeEndpointsIterator) IterateAddresses(f func(string) bool) {
(netmap.NodeInfo)(x).IterateNetworkEndpoints(f)
}
func (x NodeEndpointsIterator) NumberOfAddresses() int {
return (netmap.NodeInfo)(x).NumberOfNetworkEndpoints()
}
// 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 {
return iterateParsedAddresses(NodeEndpointsIterator(ni), checkProtocols)
}
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
}