mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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p2p/netutil: new package for network utilities
The new package contains three things for now: - IP network list parsing and matching - The WSAEMSGSIZE workaround, which is duplicated in p2p/discover and p2p/discv5.
This commit is contained in:
Felix Lange
parent
04edbb0703
commit
1d80155d5e
25
p2p/netutil/error.go
Normal file
25
p2p/netutil/error.go
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@ -0,0 +1,25 @@
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package netutil
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// IsTemporaryError checks whether the given error should be considered temporary.
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func IsTemporaryError(err error) bool {
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tempErr, ok := err.(interface {
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Temporary() bool
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})
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return ok && tempErr.Temporary() || isPacketTooBig(err)
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}
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73
p2p/netutil/error_test.go
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73
p2p/netutil/error_test.go
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@ -0,0 +1,73 @@
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package netutil
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import (
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"net"
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"testing"
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"time"
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)
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// This test checks that isPacketTooBig correctly identifies
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// errors that result from receiving a UDP packet larger
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// than the supplied receive buffer.
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func TestIsPacketTooBig(t *testing.T) {
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listener, err := net.ListenPacket("udp", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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defer listener.Close()
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sender, err := net.Dial("udp", listener.LocalAddr().String())
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if err != nil {
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t.Fatal(err)
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}
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defer sender.Close()
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sendN := 1800
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recvN := 300
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for i := 0; i < 20; i++ {
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go func() {
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buf := make([]byte, sendN)
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for i := range buf {
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buf[i] = byte(i)
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}
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sender.Write(buf)
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}()
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buf := make([]byte, recvN)
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listener.SetDeadline(time.Now().Add(1 * time.Second))
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n, _, err := listener.ReadFrom(buf)
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if err != nil {
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if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
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continue
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}
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if !isPacketTooBig(err) {
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t.Fatalf("unexpected read error: %v", err)
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}
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continue
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}
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if n != recvN {
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t.Fatalf("short read: %d, want %d", n, recvN)
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}
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for i := range buf {
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if buf[i] != byte(i) {
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t.Fatalf("error in pattern")
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break
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}
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}
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}
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}
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166
p2p/netutil/net.go
Normal file
166
p2p/netutil/net.go
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@ -0,0 +1,166 @@
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package netutil contains extensions to the net package.
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package netutil
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import (
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"errors"
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"net"
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"strings"
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)
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var lan4, lan6, special4, special6 Netlist
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func init() {
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// Lists from RFC 5735, RFC 5156,
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// https://www.iana.org/assignments/iana-ipv4-special-registry/
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lan4.Add("0.0.0.0/8") // "This" network
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lan4.Add("10.0.0.0/8") // Private Use
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lan4.Add("172.16.0.0/12") // Private Use
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lan4.Add("192.168.0.0/16") // Private Use
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lan6.Add("fe80::/10") // Link-Local
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lan6.Add("fc00::/7") // Unique-Local
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special4.Add("192.0.0.0/29") // IPv4 Service Continuity
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special4.Add("192.0.0.9/32") // PCP Anycast
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special4.Add("192.0.0.170/32") // NAT64/DNS64 Discovery
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special4.Add("192.0.0.171/32") // NAT64/DNS64 Discovery
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special4.Add("192.0.2.0/24") // TEST-NET-1
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special4.Add("192.31.196.0/24") // AS112
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special4.Add("192.52.193.0/24") // AMT
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special4.Add("192.88.99.0/24") // 6to4 Relay Anycast
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special4.Add("192.175.48.0/24") // AS112
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special4.Add("198.18.0.0/15") // Device Benchmark Testing
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special4.Add("198.51.100.0/24") // TEST-NET-2
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special4.Add("203.0.113.0/24") // TEST-NET-3
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special4.Add("255.255.255.255/32") // Limited Broadcast
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// http://www.iana.org/assignments/iana-ipv6-special-registry/
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special6.Add("100::/64")
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special6.Add("2001::/32")
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special6.Add("2001:1::1/128")
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special6.Add("2001:2::/48")
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special6.Add("2001:3::/32")
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special6.Add("2001:4:112::/48")
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special6.Add("2001:5::/32")
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special6.Add("2001:10::/28")
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special6.Add("2001:20::/28")
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special6.Add("2001:db8::/32")
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special6.Add("2002::/16")
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}
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// Netlist is a list of IP networks.
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type Netlist []net.IPNet
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// ParseNetlist parses a comma-separated list of CIDR masks.
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// Whitespace and extra commas are ignored.
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func ParseNetlist(s string) (*Netlist, error) {
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ws := strings.NewReplacer(" ", "", "\n", "", "\t", "")
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masks := strings.Split(ws.Replace(s), ",")
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l := make(Netlist, 0)
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for _, mask := range masks {
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if mask == "" {
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continue
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}
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_, n, err := net.ParseCIDR(mask)
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if err != nil {
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return nil, err
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}
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l = append(l, *n)
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}
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return &l, nil
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}
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// Add parses a CIDR mask and appends it to the list. It panics for invalid masks and is
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// intended to be used for setting up static lists.
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func (l *Netlist) Add(cidr string) {
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_, n, err := net.ParseCIDR(cidr)
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if err != nil {
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panic(err)
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}
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*l = append(*l, *n)
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}
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// Contains reports whether the given IP is contained in the list.
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func (l *Netlist) Contains(ip net.IP) bool {
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if l == nil {
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return false
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}
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for _, net := range *l {
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if net.Contains(ip) {
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return true
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}
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}
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return false
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}
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// IsLAN reports whether an IP is a local network address.
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func IsLAN(ip net.IP) bool {
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if ip.IsLoopback() {
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return true
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}
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if v4 := ip.To4(); v4 != nil {
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return lan4.Contains(v4)
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}
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return lan6.Contains(ip)
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}
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// IsSpecialNetwork reports whether an IP is located in a special-use network range
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// This includes broadcast, multicast and documentation addresses.
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func IsSpecialNetwork(ip net.IP) bool {
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if ip.IsMulticast() {
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return true
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}
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if v4 := ip.To4(); v4 != nil {
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return special4.Contains(v4)
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}
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return special6.Contains(ip)
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}
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var (
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errInvalid = errors.New("invalid IP")
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errUnspecified = errors.New("zero address")
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errSpecial = errors.New("special network")
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errLoopback = errors.New("loopback address from non-loopback host")
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errLAN = errors.New("LAN address from WAN host")
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)
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// CheckRelayIP reports whether an IP relayed from the given sender IP
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// is a valid connection target.
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//
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// There are four rules:
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// - Special network addresses are never valid.
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// - Loopback addresses are OK if relayed by a loopback host.
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// - LAN addresses are OK if relayed by a LAN host.
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// - All other addresses are always acceptable.
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func CheckRelayIP(sender, addr net.IP) error {
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if len(addr) != net.IPv4len && len(addr) != net.IPv6len {
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return errInvalid
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}
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if addr.IsUnspecified() {
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return errUnspecified
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}
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if IsSpecialNetwork(addr) {
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return errSpecial
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}
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if addr.IsLoopback() && !sender.IsLoopback() {
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return errLoopback
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}
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if IsLAN(addr) && !IsLAN(sender) {
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return errLAN
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}
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return nil
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}
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173
p2p/netutil/net_test.go
Normal file
173
p2p/netutil/net_test.go
Normal file
@ -0,0 +1,173 @@
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
|
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// it under the terms of the GNU Lesser General Public License as published by
|
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// the Free Software Foundation, either version 3 of the License, or
|
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// (at your option) any later version.
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//
|
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// The go-ethereum library is distributed in the hope that it will be useful,
|
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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// GNU Lesser General Public License for more details.
|
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//
|
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// 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/>.
|
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package netutil
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import (
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"net"
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"reflect"
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"testing"
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"github.com/davecgh/go-spew/spew"
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)
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func TestParseNetlist(t *testing.T) {
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var tests = []struct {
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input string
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wantErr error
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wantList *Netlist
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}{
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{
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input: "",
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wantList: &Netlist{},
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},
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{
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input: "127.0.0.0/8",
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wantErr: nil,
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wantList: &Netlist{{IP: net.IP{127, 0, 0, 0}, Mask: net.CIDRMask(8, 32)}},
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},
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{
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input: "127.0.0.0/44",
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wantErr: &net.ParseError{Type: "CIDR address", Text: "127.0.0.0/44"},
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},
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{
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input: "127.0.0.0/16, 23.23.23.23/24,",
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wantList: &Netlist{
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{IP: net.IP{127, 0, 0, 0}, Mask: net.CIDRMask(16, 32)},
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{IP: net.IP{23, 23, 23, 0}, Mask: net.CIDRMask(24, 32)},
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},
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},
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}
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for _, test := range tests {
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l, err := ParseNetlist(test.input)
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if !reflect.DeepEqual(err, test.wantErr) {
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t.Errorf("%q: got error %q, want %q", test.input, err, test.wantErr)
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continue
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}
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if !reflect.DeepEqual(l, test.wantList) {
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spew.Dump(l)
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spew.Dump(test.wantList)
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t.Errorf("%q: got %v, want %v", test.input, l, test.wantList)
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}
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}
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}
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func TestNilNetListContains(t *testing.T) {
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var list *Netlist
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checkContains(t, list.Contains, nil, []string{"1.2.3.4"})
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}
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func TestIsLAN(t *testing.T) {
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checkContains(t, IsLAN,
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[]string{ // included
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"0.0.0.0",
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"0.2.0.8",
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"127.0.0.1",
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"10.0.1.1",
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"10.22.0.3",
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"172.31.252.251",
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"192.168.1.4",
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"fe80::f4a1:8eff:fec5:9d9d",
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"febf::ab32:2233",
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"fc00::4",
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},
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[]string{ // excluded
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"192.0.2.1",
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"1.0.0.0",
|
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"172.32.0.1",
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"fec0::2233",
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},
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)
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}
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func TestIsSpecialNetwork(t *testing.T) {
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checkContains(t, IsSpecialNetwork,
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[]string{ // included
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"192.0.2.1",
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"192.0.2.44",
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"2001:db8:85a3:8d3:1319:8a2e:370:7348",
|
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"255.255.255.255",
|
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"224.0.0.22", // IPv4 multicast
|
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"ff05::1:3", // IPv6 multicast
|
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},
|
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[]string{ // excluded
|
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"192.0.3.1",
|
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"1.0.0.0",
|
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"172.32.0.1",
|
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"fec0::2233",
|
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},
|
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)
|
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}
|
||||
|
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func checkContains(t *testing.T, fn func(net.IP) bool, inc, exc []string) {
|
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for _, s := range inc {
|
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if !fn(parseIP(s)) {
|
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t.Error("returned false for included address", s)
|
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}
|
||||
}
|
||||
for _, s := range exc {
|
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if fn(parseIP(s)) {
|
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t.Error("returned true for excluded address", s)
|
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}
|
||||
}
|
||||
}
|
||||
|
||||
func parseIP(s string) net.IP {
|
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ip := net.ParseIP(s)
|
||||
if ip == nil {
|
||||
panic("invalid " + s)
|
||||
}
|
||||
return ip
|
||||
}
|
||||
|
||||
func TestCheckRelayIP(t *testing.T) {
|
||||
tests := []struct {
|
||||
sender, addr string
|
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want error
|
||||
}{
|
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{"127.0.0.1", "0.0.0.0", errUnspecified},
|
||||
{"192.168.0.1", "0.0.0.0", errUnspecified},
|
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{"23.55.1.242", "0.0.0.0", errUnspecified},
|
||||
{"127.0.0.1", "255.255.255.255", errSpecial},
|
||||
{"192.168.0.1", "255.255.255.255", errSpecial},
|
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{"23.55.1.242", "255.255.255.255", errSpecial},
|
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{"192.168.0.1", "127.0.2.19", errLoopback},
|
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{"23.55.1.242", "192.168.0.1", errLAN},
|
||||
|
||||
{"127.0.0.1", "127.0.2.19", nil},
|
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{"127.0.0.1", "192.168.0.1", nil},
|
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{"127.0.0.1", "23.55.1.242", nil},
|
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{"192.168.0.1", "192.168.0.1", nil},
|
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{"192.168.0.1", "23.55.1.242", nil},
|
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{"23.55.1.242", "23.55.1.242", nil},
|
||||
}
|
||||
|
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for _, test := range tests {
|
||||
err := CheckRelayIP(parseIP(test.sender), parseIP(test.addr))
|
||||
if err != test.want {
|
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t.Errorf("%s from %s: got %q, want %q", test.addr, test.sender, err, test.want)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkCheckRelayIP(b *testing.B) {
|
||||
sender := parseIP("23.55.1.242")
|
||||
addr := parseIP("23.55.1.2")
|
||||
for i := 0; i < b.N; i++ {
|
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CheckRelayIP(sender, addr)
|
||||
}
|
||||
}
|
||||
26
p2p/netutil/toobig_notwindows.go
Normal file
26
p2p/netutil/toobig_notwindows.go
Normal file
@ -0,0 +1,26 @@
|
||||
// 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/>.
|
||||
|
||||
//+build !windows
|
||||
|
||||
package netutil
|
||||
|
||||
// isPacketTooBig reports whether err indicates that a UDP packet didn't
|
||||
// fit the receive buffer. There is no such error on
|
||||
// non-Windows platforms.
|
||||
func isPacketTooBig(err error) bool {
|
||||
return false
|
||||
}
|
||||
40
p2p/netutil/toobig_windows.go
Normal file
40
p2p/netutil/toobig_windows.go
Normal file
@ -0,0 +1,40 @@
|
||||
// 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/>.
|
||||
|
||||
//+build windows
|
||||
|
||||
package netutil
|
||||
|
||||
import (
|
||||
"net"
|
||||
"os"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
const _WSAEMSGSIZE = syscall.Errno(10040)
|
||||
|
||||
// isPacketTooBig reports whether err indicates that a UDP packet didn't
|
||||
// fit the receive buffer. On Windows, WSARecvFrom returns
|
||||
// code WSAEMSGSIZE and no data if this happens.
|
||||
func isPacketTooBig(err error) bool {
|
||||
if opErr, ok := err.(*net.OpError); ok {
|
||||
if scErr, ok := opErr.Err.(*os.SyscallError); ok {
|
||||
return scErr.Err == _WSAEMSGSIZE
|
||||
}
|
||||
return opErr.Err == _WSAEMSGSIZE
|
||||
}
|
||||
return false
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user