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7f3dc5a2dd
* Add the latest git tag as part of the version string. Example: version=Prysm/v1.0.0-alpha.10/28e61fa40c7d16774b3b1c18d8382c64537bfa84. Built at: 2020-06-11 04:29:18+00:00 * add user agent Co-authored-by: Preston Van Loon <preston@prysmaticlabs.com> Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
154 lines
4.7 KiB
Go
154 lines
4.7 KiB
Go
package p2p
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import (
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"crypto/ecdsa"
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"fmt"
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"net"
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"time"
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"github.com/libp2p/go-libp2p"
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connmgr "github.com/libp2p/go-libp2p-connmgr"
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noise "github.com/libp2p/go-libp2p-noise"
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filter "github.com/multiformats/go-multiaddr"
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ma "github.com/multiformats/go-multiaddr"
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"github.com/pkg/errors"
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"github.com/prysmaticlabs/prysm/shared/featureconfig"
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"github.com/prysmaticlabs/prysm/shared/version"
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)
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const (
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// Period that we allocate each new peer before we mark them as valid
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// for trimming.
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gracePeriod = 2 * time.Minute
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// Buffer for the number of peers allowed to connect above max peers before the
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// connection manager begins trimming them.
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peerBuffer = 5
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)
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// buildOptions for the libp2p host.
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func buildOptions(cfg *Config, ip net.IP, priKey *ecdsa.PrivateKey) []libp2p.Option {
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listen, err := multiAddressBuilder(ip.String(), cfg.TCPPort)
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if err != nil {
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log.Fatalf("Failed to p2p listen: %v", err)
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}
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options := []libp2p.Option{
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privKeyOption(priKey),
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libp2p.EnableRelay(),
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libp2p.ListenAddrs(listen),
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allowListSubnet(cfg.AllowListCIDR),
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denyListSubnets(cfg.DenyListCIDR),
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libp2p.UserAgent(version.GetBuildData()),
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// Add one for the boot node and another for the relay, otherwise when we are close to maxPeers we will be above the high
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// water mark and continually trigger pruning.
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libp2p.ConnectionManager(connmgr.NewConnManager(int(cfg.MaxPeers), int(cfg.MaxPeers+peerBuffer), gracePeriod)),
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}
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if featureconfig.Get().EnableNoise {
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// Enable NOISE for the beacon node
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options = append(options, libp2p.Security(noise.ID, noise.New))
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}
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if cfg.EnableUPnP {
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options = append(options, libp2p.NATPortMap()) //Allow to use UPnP
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}
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if cfg.RelayNodeAddr != "" {
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options = append(options, libp2p.AddrsFactory(withRelayAddrs(cfg.RelayNodeAddr)))
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}
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if cfg.HostAddress != "" {
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options = append(options, libp2p.AddrsFactory(func(addrs []ma.Multiaddr) []ma.Multiaddr {
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external, err := multiAddressBuilder(cfg.HostAddress, cfg.TCPPort)
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if err != nil {
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log.WithError(err).Error("Unable to create external multiaddress")
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} else {
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addrs = append(addrs, external)
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}
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return addrs
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}))
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}
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if cfg.HostDNS != "" {
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options = append(options, libp2p.AddrsFactory(func(addrs []ma.Multiaddr) []ma.Multiaddr {
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external, err := ma.NewMultiaddr(fmt.Sprintf("/dns4/%s/tcp/%d", cfg.HostDNS, cfg.TCPPort))
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if err != nil {
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log.WithError(err).Error("Unable to create external multiaddress")
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} else {
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addrs = append(addrs, external)
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}
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return addrs
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}))
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}
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if cfg.LocalIP != "" {
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if net.ParseIP(cfg.LocalIP) == nil {
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log.Errorf("Invalid local ip provided: %s", cfg.LocalIP)
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return options
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}
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listen, err = multiAddressBuilder(cfg.LocalIP, cfg.TCPPort)
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if err != nil {
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log.Fatalf("Failed to p2p listen: %v", err)
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}
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options = append(options, libp2p.ListenAddrs(listen))
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}
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return options
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}
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func multiAddressBuilder(ipAddr string, port uint) (ma.Multiaddr, error) {
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parsedIP := net.ParseIP(ipAddr)
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if parsedIP.To4() == nil && parsedIP.To16() == nil {
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return nil, errors.Errorf("invalid ip address provided: %s", ipAddr)
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}
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if parsedIP.To4() != nil {
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return ma.NewMultiaddr(fmt.Sprintf("/ip4/%s/tcp/%d", ipAddr, port))
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}
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return ma.NewMultiaddr(fmt.Sprintf("/ip6/%s/tcp/%d", ipAddr, port))
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}
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// Adds a private key to the libp2p option if the option was provided.
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// If the private key file is missing or cannot be read, or if the
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// private key contents cannot be marshaled, an exception is thrown.
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func privKeyOption(privkey *ecdsa.PrivateKey) libp2p.Option {
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return func(cfg *libp2p.Config) error {
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log.Debug("ECDSA private key generated")
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return cfg.Apply(libp2p.Identity(convertToInterfacePrivkey(privkey)))
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}
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}
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// allowListSubnet adds an allowed multiaddress filter for a given CIDR subnet.
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// Example: 192.168.0.0/16 may be used to accept only connections on your local
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// network.
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func allowListSubnet(cidr string) libp2p.Option {
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if cidr == "" {
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return func(_ *libp2p.Config) error {
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return nil
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}
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}
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_, ipnet, err := net.ParseCIDR(cidr)
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if err != nil {
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return func(_ *libp2p.Config) error {
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return err
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}
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}
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filters := filter.NewFilters()
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filters.AddFilter(*ipnet, filter.ActionAccept)
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return libp2p.Filters(filters)
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}
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// denyListSubnets adds a deny multiaddress filter for multiple given CIDR subnets.
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// Example: 192.168.0.0/16 may be used to deny connections from your local
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// network.
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func denyListSubnets(mulCidrs []string) libp2p.Option {
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if len(mulCidrs) == 0 {
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return func(_ *libp2p.Config) error {
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return nil
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}
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}
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ipNets := []*net.IPNet{}
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for _, cidr := range mulCidrs {
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_, ipnet, err := net.ParseCIDR(cidr)
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if err != nil {
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return func(_ *libp2p.Config) error {
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return err
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}
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}
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ipNets = append(ipNets, ipnet)
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}
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return libp2p.FilterAddresses(ipNets...)
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}
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