Update dependencies
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bluepython508
343
vendor/tailscale.com/net/ping/ping.go
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vendored
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343
vendor/tailscale.com/net/ping/ping.go
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vendored
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package ping allows sending ICMP echo requests to a host in order to
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// determine network latency.
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package ping
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import (
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"bytes"
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"context"
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"io"
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"log"
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"net"
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"net/netip"
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"sync"
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"sync/atomic"
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"time"
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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"tailscale.com/types/logger"
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"tailscale.com/util/mak"
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"tailscale.com/util/multierr"
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)
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const (
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v4Type = "ip4:icmp"
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v6Type = "ip6:icmp"
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)
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type response struct {
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t time.Time
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err error
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}
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type outstanding struct {
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ch chan response
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data []byte
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}
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// PacketListener defines the interface required to listen to packages
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// on an address.
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type ListenPacketer interface {
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ListenPacket(ctx context.Context, typ string, addr string) (net.PacketConn, error)
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}
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// Pinger represents a set of ICMP echo requests to be sent at a single time.
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//
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// A new instance should be created for each concurrent set of ping requests;
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// this type should not be reused.
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type Pinger struct {
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lp ListenPacketer
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// closed guards against send incrementing the waitgroup concurrently with close.
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closed atomic.Bool
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Logf logger.Logf
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Verbose bool
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timeNow func() time.Time
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id uint16 // uint16 per RFC 792
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wg sync.WaitGroup
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// Following fields protected by mu
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mu sync.Mutex
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// conns is a map of "type" to net.PacketConn, type is either
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// "ip4:icmp" or "ip6:icmp"
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conns map[string]net.PacketConn
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seq uint16 // uint16 per RFC 792
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pings map[uint16]outstanding
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}
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// New creates a new Pinger. The Context provided will be used to create
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// network listeners, and to set an absolute deadline (if any) on the net.Conn
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func New(ctx context.Context, logf logger.Logf, lp ListenPacketer) *Pinger {
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var id [2]byte
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if _, err := io.ReadFull(rand.Reader, id[:]); err != nil {
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panic("net/ping: New:" + err.Error())
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}
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return &Pinger{
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lp: lp,
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Logf: logf,
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timeNow: time.Now,
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id: binary.LittleEndian.Uint16(id[:]),
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pings: make(map[uint16]outstanding),
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}
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}
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func (p *Pinger) mkconn(ctx context.Context, typ, addr string) (net.PacketConn, error) {
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if p.closed.Load() {
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return nil, net.ErrClosed
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}
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c, err := p.lp.ListenPacket(ctx, typ, addr)
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if err != nil {
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return nil, err
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}
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// Start by setting the deadline from the context; note that this
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// applies to all future I/O, so we only need to do it once.
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deadline, ok := ctx.Deadline()
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if ok {
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if err := c.SetReadDeadline(deadline); err != nil {
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return nil, err
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}
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}
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p.wg.Add(1)
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go p.run(ctx, c, typ)
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return c, err
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}
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// getConn creates or returns a conn matching typ which is ip4:icmp
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// or ip6:icmp.
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func (p *Pinger) getConn(ctx context.Context, typ string) (net.PacketConn, error) {
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p.mu.Lock()
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defer p.mu.Unlock()
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if c, ok := p.conns[typ]; ok {
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return c, nil
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}
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var addr = "0.0.0.0"
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if typ == v6Type {
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addr = "::"
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}
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c, err := p.mkconn(ctx, typ, addr)
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if err != nil {
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return nil, err
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}
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mak.Set(&p.conns, typ, c)
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return c, nil
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}
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func (p *Pinger) logf(format string, a ...any) {
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if p.Logf != nil {
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p.Logf(format, a...)
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} else {
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log.Printf(format, a...)
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}
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}
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func (p *Pinger) vlogf(format string, a ...any) {
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if p.Verbose {
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p.logf(format, a...)
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}
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}
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func (p *Pinger) Close() error {
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p.closed.Store(true)
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p.mu.Lock()
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conns := p.conns
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p.conns = nil
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p.mu.Unlock()
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var errors []error
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for _, c := range conns {
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if err := c.Close(); err != nil {
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errors = append(errors, err)
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}
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}
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p.wg.Wait()
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p.cleanupOutstanding()
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return multierr.New(errors...)
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}
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func (p *Pinger) run(ctx context.Context, conn net.PacketConn, typ string) {
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defer p.wg.Done()
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defer func() {
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conn.Close()
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p.mu.Lock()
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delete(p.conns, typ)
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p.mu.Unlock()
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}()
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buf := make([]byte, 1500)
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loop:
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for {
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select {
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case <-ctx.Done():
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break loop
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default:
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}
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n, _, err := conn.ReadFrom(buf)
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if err != nil {
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// Ignore temporary errors; everything else is fatal
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if netErr, ok := err.(net.Error); !ok || !netErr.Temporary() {
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break
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}
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continue
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}
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p.handleResponse(buf[:n], p.timeNow(), typ)
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}
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}
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func (p *Pinger) cleanupOutstanding() {
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// Complete outstanding requests
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p.mu.Lock()
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defer p.mu.Unlock()
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for _, o := range p.pings {
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o.ch <- response{err: net.ErrClosed}
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}
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}
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func (p *Pinger) handleResponse(buf []byte, now time.Time, typ string) {
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// We need to handle responding to both IPv4
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// and IPv6.
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var icmpType icmp.Type
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switch typ {
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case v4Type:
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icmpType = ipv4.ICMPTypeEchoReply
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case v6Type:
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icmpType = ipv6.ICMPTypeEchoReply
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default:
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p.vlogf("handleResponse: unknown icmp.Type")
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return
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}
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m, err := icmp.ParseMessage(icmpType.Protocol(), buf)
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if err != nil {
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p.vlogf("handleResponse: invalid packet: %v", err)
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return
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}
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if m.Type != icmpType {
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p.vlogf("handleResponse: wanted m.Type=%d; got %d", icmpType, m.Type)
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return
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}
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resp, ok := m.Body.(*icmp.Echo)
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if !ok || resp == nil {
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p.vlogf("handleResponse: wanted body=*icmp.Echo; got %v", m.Body)
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return
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}
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// We assume we sent this if the ID in the response is ours.
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if uint16(resp.ID) != p.id {
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p.vlogf("handleResponse: wanted ID=%d; got %d", p.id, resp.ID)
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return
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}
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// Search for existing running echo request
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var o outstanding
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p.mu.Lock()
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if o, ok = p.pings[uint16(resp.Seq)]; ok {
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// Ensure that the data matches before we delete from our map,
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// so a future correct packet will be handled correctly.
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if bytes.Equal(resp.Data, o.data) {
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delete(p.pings, uint16(resp.Seq))
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} else {
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p.vlogf("handleResponse: got response for Seq %d with mismatched data", resp.Seq)
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ok = false
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}
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} else {
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p.vlogf("handleResponse: got response for unknown Seq %d", resp.Seq)
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}
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p.mu.Unlock()
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if ok {
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o.ch <- response{t: now}
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}
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}
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// Send sends an ICMP Echo Request packet to the destination, waits for a
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// response, and returns the duration between when the request was sent and
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// when the reply was received.
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//
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// If provided, "data" is sent with the packet and is compared upon receiving a
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// reply.
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func (p *Pinger) Send(ctx context.Context, dest net.Addr, data []byte) (time.Duration, error) {
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// Use sequential sequence numbers on the assumption that we will not
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// wrap around when using a single Pinger instance
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p.mu.Lock()
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p.seq++
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seq := p.seq
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p.mu.Unlock()
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// Check whether the address is IPv4 or IPv6 to
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// determine the icmp.Type and conn to use.
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var conn net.PacketConn
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var icmpType icmp.Type = ipv4.ICMPTypeEcho
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ap, err := netip.ParseAddr(dest.String())
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if err != nil {
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return 0, err
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}
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if ap.Is6() {
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icmpType = ipv6.ICMPTypeEchoRequest
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conn, err = p.getConn(ctx, v6Type)
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} else {
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conn, err = p.getConn(ctx, v4Type)
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}
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if err != nil {
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return 0, err
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}
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m := icmp.Message{
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Type: icmpType,
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Code: 0,
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Body: &icmp.Echo{
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ID: int(p.id),
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Seq: int(seq),
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Data: data,
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},
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}
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b, err := m.Marshal(nil)
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if err != nil {
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return 0, err
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}
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// Register our response before sending since we could otherwise race a
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// quick reply.
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ch := make(chan response, 1)
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p.mu.Lock()
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p.pings[seq] = outstanding{ch: ch, data: data}
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p.mu.Unlock()
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start := p.timeNow()
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n, err := conn.WriteTo(b, dest)
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if err != nil {
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return 0, err
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} else if n != len(b) {
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return 0, fmt.Errorf("conn.WriteTo: got %v; want %v", n, len(b))
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}
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select {
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case resp := <-ch:
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if resp.err != nil {
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return 0, resp.err
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}
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return resp.t.Sub(start), nil
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case <-ctx.Done():
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return 0, ctx.Err()
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}
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}
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