Official Go implementation of the Ethereum protocol
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go-ethereum/p2p/netutil/net.go

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9.2 KiB

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package netutil contains extensions to the net package.
package netutil
import (
"bytes"
"errors"
"fmt"
"net"
"net/netip"
"slices"
"strings"
"golang.org/x/exp/maps"
)
var special4, special6 Netlist
func init() {
// Lists from RFC 5735, RFC 5156,
// https://www.iana.org/assignments/iana-ipv4-special-registry/
special4.Add("0.0.0.0/8") // "This" network.
special4.Add("192.0.0.0/29") // IPv4 Service Continuity
special4.Add("192.0.0.9/32") // PCP Anycast
special4.Add("192.0.0.170/32") // NAT64/DNS64 Discovery
special4.Add("192.0.0.171/32") // NAT64/DNS64 Discovery
special4.Add("192.0.2.0/24") // TEST-NET-1
special4.Add("192.31.196.0/24") // AS112
special4.Add("192.52.193.0/24") // AMT
special4.Add("192.88.99.0/24") // 6to4 Relay Anycast
special4.Add("192.175.48.0/24") // AS112
special4.Add("198.18.0.0/15") // Device Benchmark Testing
special4.Add("198.51.100.0/24") // TEST-NET-2
special4.Add("203.0.113.0/24") // TEST-NET-3
special4.Add("255.255.255.255/32") // Limited Broadcast
// http://www.iana.org/assignments/iana-ipv6-special-registry/
special6.Add("100::/64")
special6.Add("2001::/32")
special6.Add("2001:1::1/128")
special6.Add("2001:2::/48")
special6.Add("2001:3::/32")
special6.Add("2001:4:112::/48")
special6.Add("2001:5::/32")
special6.Add("2001:10::/28")
special6.Add("2001:20::/28")
special6.Add("2001:db8::/32")
special6.Add("2002::/16")
}
// Netlist is a list of IP networks.
type Netlist []netip.Prefix
// ParseNetlist parses a comma-separated list of CIDR masks.
// Whitespace and extra commas are ignored.
func ParseNetlist(s string) (*Netlist, error) {
ws := strings.NewReplacer(" ", "", "\n", "", "\t", "")
masks := strings.Split(ws.Replace(s), ",")
l := make(Netlist, 0)
for _, mask := range masks {
if mask == "" {
continue
}
prefix, err := netip.ParsePrefix(mask)
if err != nil {
return nil, err
}
l = append(l, prefix)
}
return &l, nil
}
cmd/geth: add --config file flag (#13875) * p2p/discover, p2p/discv5: add marshaling methods to Node * p2p/netutil: make Netlist decodable from TOML * common/math: encode nil HexOrDecimal256 as 0x0 * cmd/geth: add --config file flag * cmd/geth: add missing license header * eth: prettify Config again, fix tests * eth: use gasprice.Config instead of duplicating its fields * eth/gasprice: hide nil default from dumpconfig output * cmd/geth: hide genesis block in dumpconfig output * node: make tests compile * console: fix tests * cmd/geth: make TOML keys look exactly like Go struct fields * p2p: use discovery by default This makes the zero Config slightly more useful. It also fixes package node tests because Node detects reuse of the datadir through the NodeDatabase. * cmd/geth: make ethstats URL settable through config file * cmd/faucet: fix configuration * cmd/geth: dedup attach tests * eth: add comment for DefaultConfig * eth: pass downloader.SyncMode in Config This removes the FastSync, LightSync flags in favour of a more general SyncMode flag. * cmd/utils: remove jitvm flags * cmd/utils: make mutually exclusive flag error prettier It now reads: Fatal: flags --dev, --testnet can't be used at the same time * p2p: fix typo * node: add DefaultConfig, use it for geth * mobile: add missing NoDiscovery option * cmd/utils: drop MakeNode This exposed a couple of places that needed to be updated to use node.DefaultConfig. * node: fix typo * eth: make fast sync the default mode * cmd/utils: remove IPCApiFlag (unused) * node: remove default IPC path Set it in the frontends instead. * cmd/geth: add --syncmode * cmd/utils: make --ipcdisable and --ipcpath mutually exclusive * cmd/utils: don't enable WS, HTTP when setting addr * cmd/utils: fix --identity
8 years ago
// MarshalTOML implements toml.MarshalerRec.
func (l Netlist) MarshalTOML() interface{} {
list := make([]string, 0, len(l))
for _, net := range l {
list = append(list, net.String())
}
return list
}
// UnmarshalTOML implements toml.UnmarshalerRec.
func (l *Netlist) UnmarshalTOML(fn func(interface{}) error) error {
var masks []string
if err := fn(&masks); err != nil {
return err
}
for _, mask := range masks {
prefix, err := netip.ParsePrefix(mask)
cmd/geth: add --config file flag (#13875) * p2p/discover, p2p/discv5: add marshaling methods to Node * p2p/netutil: make Netlist decodable from TOML * common/math: encode nil HexOrDecimal256 as 0x0 * cmd/geth: add --config file flag * cmd/geth: add missing license header * eth: prettify Config again, fix tests * eth: use gasprice.Config instead of duplicating its fields * eth/gasprice: hide nil default from dumpconfig output * cmd/geth: hide genesis block in dumpconfig output * node: make tests compile * console: fix tests * cmd/geth: make TOML keys look exactly like Go struct fields * p2p: use discovery by default This makes the zero Config slightly more useful. It also fixes package node tests because Node detects reuse of the datadir through the NodeDatabase. * cmd/geth: make ethstats URL settable through config file * cmd/faucet: fix configuration * cmd/geth: dedup attach tests * eth: add comment for DefaultConfig * eth: pass downloader.SyncMode in Config This removes the FastSync, LightSync flags in favour of a more general SyncMode flag. * cmd/utils: remove jitvm flags * cmd/utils: make mutually exclusive flag error prettier It now reads: Fatal: flags --dev, --testnet can't be used at the same time * p2p: fix typo * node: add DefaultConfig, use it for geth * mobile: add missing NoDiscovery option * cmd/utils: drop MakeNode This exposed a couple of places that needed to be updated to use node.DefaultConfig. * node: fix typo * eth: make fast sync the default mode * cmd/utils: remove IPCApiFlag (unused) * node: remove default IPC path Set it in the frontends instead. * cmd/geth: add --syncmode * cmd/utils: make --ipcdisable and --ipcpath mutually exclusive * cmd/utils: don't enable WS, HTTP when setting addr * cmd/utils: fix --identity
8 years ago
if err != nil {
return err
}
*l = append(*l, prefix)
cmd/geth: add --config file flag (#13875) * p2p/discover, p2p/discv5: add marshaling methods to Node * p2p/netutil: make Netlist decodable from TOML * common/math: encode nil HexOrDecimal256 as 0x0 * cmd/geth: add --config file flag * cmd/geth: add missing license header * eth: prettify Config again, fix tests * eth: use gasprice.Config instead of duplicating its fields * eth/gasprice: hide nil default from dumpconfig output * cmd/geth: hide genesis block in dumpconfig output * node: make tests compile * console: fix tests * cmd/geth: make TOML keys look exactly like Go struct fields * p2p: use discovery by default This makes the zero Config slightly more useful. It also fixes package node tests because Node detects reuse of the datadir through the NodeDatabase. * cmd/geth: make ethstats URL settable through config file * cmd/faucet: fix configuration * cmd/geth: dedup attach tests * eth: add comment for DefaultConfig * eth: pass downloader.SyncMode in Config This removes the FastSync, LightSync flags in favour of a more general SyncMode flag. * cmd/utils: remove jitvm flags * cmd/utils: make mutually exclusive flag error prettier It now reads: Fatal: flags --dev, --testnet can't be used at the same time * p2p: fix typo * node: add DefaultConfig, use it for geth * mobile: add missing NoDiscovery option * cmd/utils: drop MakeNode This exposed a couple of places that needed to be updated to use node.DefaultConfig. * node: fix typo * eth: make fast sync the default mode * cmd/utils: remove IPCApiFlag (unused) * node: remove default IPC path Set it in the frontends instead. * cmd/geth: add --syncmode * cmd/utils: make --ipcdisable and --ipcpath mutually exclusive * cmd/utils: don't enable WS, HTTP when setting addr * cmd/utils: fix --identity
8 years ago
}
return nil
}
// Add parses a CIDR mask and appends it to the list. It panics for invalid masks and is
// intended to be used for setting up static lists.
func (l *Netlist) Add(cidr string) {
prefix, err := netip.ParsePrefix(cidr)
if err != nil {
panic(err)
}
*l = append(*l, prefix)
}
// Contains reports whether the given IP is contained in the list.
func (l *Netlist) Contains(ip net.IP) bool {
return l.ContainsAddr(IPToAddr(ip))
}
// ContainsAddr reports whether the given IP is contained in the list.
func (l *Netlist) ContainsAddr(ip netip.Addr) bool {
if l == nil {
return false
}
for _, net := range *l {
if net.Contains(ip) {
return true
}
}
return false
}
// IsLAN reports whether an IP is a local network address.
func IsLAN(ip net.IP) bool {
return AddrIsLAN(IPToAddr(ip))
}
// AddrIsLAN reports whether an IP is a local network address.
func AddrIsLAN(ip netip.Addr) bool {
if ip.Is4In6() {
ip = netip.AddrFrom4(ip.As4())
}
if ip.IsLoopback() {
return true
}
return ip.IsPrivate() || ip.IsLinkLocalUnicast()
}
// IsSpecialNetwork reports whether an IP is located in a special-use network range
// This includes broadcast, multicast and documentation addresses.
func IsSpecialNetwork(ip net.IP) bool {
return AddrIsSpecialNetwork(IPToAddr(ip))
}
// AddrIsSpecialNetwork reports whether an IP is located in a special-use network range
// This includes broadcast, multicast and documentation addresses.
func AddrIsSpecialNetwork(ip netip.Addr) bool {
if ip.Is4In6() {
ip = netip.AddrFrom4(ip.As4())
}
if ip.IsMulticast() {
return true
}
if ip.Is4() {
return special4.ContainsAddr(ip)
}
return special6.ContainsAddr(ip)
}
var (
errInvalid = errors.New("invalid IP")
errUnspecified = errors.New("zero address")
errSpecial = errors.New("special network")
errLoopback = errors.New("loopback address from non-loopback host")
errLAN = errors.New("LAN address from WAN host")
)
// CheckRelayIP reports whether an IP relayed from the given sender IP
// is a valid connection target.
//
// There are four rules:
// - Special network addresses are never valid.
// - Loopback addresses are OK if relayed by a loopback host.
// - LAN addresses are OK if relayed by a LAN host.
// - All other addresses are always acceptable.
func CheckRelayIP(sender, addr net.IP) error {
return CheckRelayAddr(IPToAddr(sender), IPToAddr(addr))
}
// CheckRelayAddr reports whether an IP relayed from the given sender IP
// is a valid connection target.
//
// There are four rules:
// - Special network addresses are never valid.
// - Loopback addresses are OK if relayed by a loopback host.
// - LAN addresses are OK if relayed by a LAN host.
// - All other addresses are always acceptable.
func CheckRelayAddr(sender, addr netip.Addr) error {
if !addr.IsValid() {
return errInvalid
}
if addr.IsUnspecified() {
return errUnspecified
}
if AddrIsSpecialNetwork(addr) {
return errSpecial
}
if addr.IsLoopback() && !sender.IsLoopback() {
return errLoopback
}
if AddrIsLAN(addr) && !AddrIsLAN(sender) {
return errLAN
}
return nil
}
// SameNet reports whether two IP addresses have an equal prefix of the given bit length.
func SameNet(bits uint, ip, other net.IP) bool {
ip4, other4 := ip.To4(), other.To4()
switch {
case (ip4 == nil) != (other4 == nil):
return false
case ip4 != nil:
return sameNet(bits, ip4, other4)
default:
return sameNet(bits, ip.To16(), other.To16())
}
}
func sameNet(bits uint, ip, other net.IP) bool {
nb := int(bits / 8)
mask := ^byte(0xFF >> (bits % 8))
if mask != 0 && nb < len(ip) && ip[nb]&mask != other[nb]&mask {
return false
}
return nb <= len(ip) && ip[:nb].Equal(other[:nb])
}
// DistinctNetSet tracks IPs, ensuring that at most N of them
// fall into the same network range.
type DistinctNetSet struct {
Subnet uint // number of common prefix bits
Limit uint // maximum number of IPs in each subnet
members map[netip.Prefix]uint
}
// Add adds an IP address to the set. It returns false (and doesn't add the IP) if the
// number of existing IPs in the defined range exceeds the limit.
func (s *DistinctNetSet) Add(ip net.IP) bool {
return s.AddAddr(IPToAddr(ip))
}
// AddAddr adds an IP address to the set. It returns false (and doesn't add the IP) if the
// number of existing IPs in the defined range exceeds the limit.
func (s *DistinctNetSet) AddAddr(ip netip.Addr) bool {
key := s.key(ip)
n := s.members[key]
if n < s.Limit {
s.members[key] = n + 1
return true
}
return false
}
// Remove removes an IP from the set.
func (s *DistinctNetSet) Remove(ip net.IP) {
s.RemoveAddr(IPToAddr(ip))
}
// RemoveAddr removes an IP from the set.
func (s *DistinctNetSet) RemoveAddr(ip netip.Addr) {
key := s.key(ip)
if n, ok := s.members[key]; ok {
if n == 1 {
delete(s.members, key)
} else {
s.members[key] = n - 1
}
}
}
// Contains whether the given IP is contained in the set.
func (s DistinctNetSet) Contains(ip net.IP) bool {
return s.ContainsAddr(IPToAddr(ip))
}
// ContainsAddr whether the given IP is contained in the set.
func (s DistinctNetSet) ContainsAddr(ip netip.Addr) bool {
key := s.key(ip)
_, ok := s.members[key]
return ok
}
// Len returns the number of tracked IPs.
func (s DistinctNetSet) Len() int {
n := uint(0)
for _, i := range s.members {
n += i
}
return int(n)
}
// key returns the map key for ip.
func (s *DistinctNetSet) key(ip netip.Addr) netip.Prefix {
// Lazily initialize storage.
if s.members == nil {
s.members = make(map[netip.Prefix]uint)
}
p, err := ip.Prefix(int(s.Subnet))
if err != nil {
panic(err)
}
return p
}
// String implements fmt.Stringer
func (s DistinctNetSet) String() string {
keys := maps.Keys(s.members)
slices.SortFunc(keys, func(a, b netip.Prefix) int {
return strings.Compare(a.String(), b.String())
})
var buf bytes.Buffer
buf.WriteString("{")
for i, k := range keys {
fmt.Fprintf(&buf, "%v×%d", k, s.members[k])
if i != len(keys)-1 {
buf.WriteString(" ")
}
}
buf.WriteString("}")
return buf.String()
}