probing

package module
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 Go to latest Published: Jun 5, 2023 License: MIT Imports: 20 Imported by: 0

README

pro-bing

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A simple but powerful ICMP echo (ping) library for Go, inspired by go-ping & go-fastping.

Here is a very simple example that sends and receives three packets:

pinger, err := probing.NewPinger("www.google.com")
if err != nil {
	panic(err)
}
pinger.Count = 3
err = pinger.Run() // Blocks until finished.
if err != nil {
	panic(err)
}
stats := pinger.Statistics() // get send/receive/duplicate/rtt stats

Here is an example that emulates the traditional UNIX ping command:

pinger, err := probing.NewPinger("www.google.com")
if err != nil {
	panic(err)
}

// Listen for Ctrl-C.
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
	for _ = range c {
		pinger.Stop()
	}
}()

pinger.OnRecv = func(pkt *probing.Packet) {
	fmt.Printf("%d bytes from %s: icmp_seq=%d time=%v\n",
		pkt.Nbytes, pkt.IPAddr, pkt.Seq, pkt.Rtt)
}

pinger.OnDuplicateRecv = func(pkt *probing.Packet) {
	fmt.Printf("%d bytes from %s: icmp_seq=%d time=%v ttl=%v (DUP!)\n",
		pkt.Nbytes, pkt.IPAddr, pkt.Seq, pkt.Rtt, pkt.Ttl)
}

pinger.OnFinish = func(stats *ping.Statistics) {
	fmt.Printf("\n--- %s ping statistics ---\n", stats.Addr)
	fmt.Printf("%d packets transmitted, %d packets received, %v%% packet loss\n",
		stats.PacketsSent, stats.PacketsRecv, stats.PacketLoss)
	fmt.Printf("round-trip min/avg/max/stddev = %v/%v/%v/%v\n",
		stats.MinRtt, stats.AvgRtt, stats.MaxRtt, stats.StdDevRtt)
}

fmt.Printf("PING %s (%s):\n", pinger.Addr(), pinger.IPAddr())
err = pinger.Run()
if err != nil {
	panic(err)
}

It sends ICMP Echo Request packet(s) and waits for an Echo Reply in response. If it receives a response, it calls the OnRecv callback unless a packet with that sequence number has already been received, in which case it calls the OnDuplicateRecv callback. When it's finished, it calls the OnFinish callback.

For a full ping example, see cmd/ping/ping.go.

Installation

go get -u github.com/prometheus-community/pro-bing

To install the native Go ping executable:

go get -u github.com/prometheus-community/pro-bing/...
$GOPATH/bin/ping

Supported Operating Systems

Linux

This library attempts to send an "unprivileged" ping via UDP. On Linux, this must be enabled with the following sysctl command:

sudo sysctl -w net.ipv4.ping_group_range="0 2147483647"

If you do not wish to do this, you can call pinger.SetPrivileged(true) in your code and then use setcap on your binary to allow it to bind to raw sockets (or just run it as root):

setcap cap_net_raw=+ep /path/to/your/compiled/binary

See this blog and the Go x/net/icmp package for more details.

This library supports setting the SO_MARK socket option which is equivalent to the -m mark flag in standard ping binaries on linux. Setting this option requires the CAP_NET_ADMIN capability (via setcap or elevated privileges). You can set a mark (ex: 100) with pinger.SetMark(100) in your code.

Setting the "Don't Fragment" bit is supported under Linux which is equivalent to ping -Mdo. You can enable this with pinger.SetDoNotFragment(true).

Windows

You must use pinger.SetPrivileged(true), otherwise you will receive the following error:

socket: The requested protocol has not been configured into the system, or no implementation for it exists.

Despite the method name, this should work without the need to elevate privileges and has been tested on Windows 10. Please note that accessing packet TTL values is not supported due to limitations in the Go x/net/ipv4 and x/net/ipv6 packages.

Plan 9 from Bell Labs

There is no support for Plan 9. This is because the entire x/net/ipv4 and x/net/ipv6 packages are not implemented by the Go programming language.

Maintainers and Getting Help:

This repo was originally in the personal account of sparrc, but is now maintained by the Prometheus Community.

Contributing

Refer to CONTRIBUTING.md

Documentation

Overview

Package probing is a simple but powerful ICMP echo (ping) library.

Here is a very simple example that sends and receives three packets: 

pinger, err := probing.NewPinger("www.google.com")
if err != nil {
	panic(err)
}
pinger.Count = 3
err = pinger.Run() // blocks until finished
if err != nil {
	panic(err)
}
stats := pinger.Statistics() // get send/receive/rtt stats

Here is an example that emulates the traditional UNIX ping command: 

pinger, err := probing.NewPinger("www.google.com")
if err != nil {
	panic(err)
}
// Listen for Ctrl-C.
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
	for _ = range c {
		pinger.Stop()
	}
}()
pinger.OnRecv = func(pkt *probing.Packet) {
	fmt.Printf("%d bytes from %s: icmp_seq=%d time=%v\n",
		pkt.Nbytes, pkt.IPAddr, pkt.Seq, pkt.Rtt)
}
pinger.OnFinish = func(stats *probing.Statistics) {
	fmt.Printf("\n--- %s ping statistics ---\n", stats.Addr)
	fmt.Printf("%d packets transmitted, %d packets received, %v%% packet loss\n",
		stats.PacketsSent, stats.PacketsRecv, stats.PacketLoss)
	fmt.Printf("round-trip min/avg/max/stddev = %v/%v/%v/%v\n",
		stats.MinRtt, stats.AvgRtt, stats.MaxRtt, stats.StdDevRtt)
}
fmt.Printf("PING %s (%s):\n", pinger.Addr(), pinger.IPAddr())
err = pinger.Run()
if err != nil {
	panic(err)
}

It sends ICMP Echo Request packet(s) and waits for an Echo Reply in response. If it receives a response, it calls the OnRecv callback. When it's finished, it calls the OnFinish callback.

For a full ping example, see "cmd/ping/ping.go".

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrMarkNotSupported = errors.New("setting SO_MARK socket option is not supported on this platform")
	ErrDFNotSupported   = errors.New("setting do-not-fragment bit is not supported on this platform")
)

Functions

This section is empty.

Types

type Logger 

type Logger interface {
	Fatalf(format string, v ...interface{})
	Errorf(format string, v ...interface{})
	Warnf(format string, v ...interface{})
	Infof(format string, v ...interface{})
	Debugf(format string, v ...interface{})
}

type NoopLogger 

type NoopLogger struct {
}

func (NoopLogger) Debugf 

func (l NoopLogger) Debugf(format string, v ...interface{})

func (NoopLogger) Errorf 

func (l NoopLogger) Errorf(format string, v ...interface{})

func (NoopLogger) Fatalf 

func (l NoopLogger) Fatalf(format string, v ...interface{})

func (NoopLogger) Infof 

func (l NoopLogger) Infof(format string, v ...interface{})

func (NoopLogger) Warnf 

func (l NoopLogger) Warnf(format string, v ...interface{})

type Packet 

type Packet struct {
	// Rtt is the round-trip time it took to ping.
	Rtt time.Duration

	// IPAddr is the address of the host being pinged.
	IPAddr *net.IPAddr

	// Addr is the string address of the host being pinged.
	Addr string

	// NBytes is the number of bytes in the message.
	Nbytes int

	// Seq is the ICMP sequence number.
	Seq int

	// TTL is the Time To Live on the packet.
	TTL int

	// ID is the ICMP identifier.
	ID int
}

Packet represents a received and processed ICMP echo packet.

type Pinger 

type Pinger struct {
	// Interval is the wait time between each packet send. Default is 1s.
	Interval time.Duration

	// Timeout specifies a timeout before ping exits, regardless of how many
	// packets have been received.
	Timeout time.Duration

	// PacketTimeout specifies a timeout per packet.
	PacketTimeout time.Duration

	// Count tells pinger to stop after sending (and receiving) Count echo
	// packets. If this option is not specified, pinger will operate until
	// interrupted.
	Count int

	// Debug runs in debug mode
	Debug bool

	// Number of packets sent
	PacketsSent int

	// Number of packets received
	PacketsRecv int

	// Number of duplicate packets received
	PacketsRecvDuplicates int

	// If true, keep a record of rtts of all received packets.
	// Set to false to avoid memory bloat for long running pings.
	RecordRtts bool

	// OnSetup is called when Pinger has finished setting up the listening socket
	OnSetup func()

	// OnSend is called when Pinger sends a packet
	OnSend func(*Packet)

	// OnRecv is called when Pinger receives and processes a packet
	OnRecv func(*Packet)

	// OnFinish is called when Pinger exits
	OnFinish func(*Statistics)

	// OnDuplicateRecv is called when a packet is received that has already been received.
	OnDuplicateRecv func(*Packet)

	// Size of packet being sent
	Size int

	// Tracker: Used to uniquely identify packets - Deprecated
	Tracker uint64

	// Source is the source IP address
	Source string

	TTL int
	// contains filtered or unexported fields
}

Pinger represents a packet sender/receiver.

func New 

func New(addr string) *Pinger

New returns a new Pinger struct pointer.

func NewPinger 

func NewPinger(addr string) (*Pinger, error)

NewPinger returns a new Pinger and resolves the address.

func (*Pinger) Addr 

func (p *Pinger) Addr() string

Addr returns the string ip address of the target host.

func (*Pinger) ID 

func (p *Pinger) ID() int

ID returns the ICMP identifier.

func (*Pinger) IPAddr 

func (p *Pinger) IPAddr() *net.IPAddr

IPAddr returns the ip address of the target host.

func (*Pinger) Mark 

func (p *Pinger) Mark() uint

Mark returns the mark to be set on outgoing ICMP packets.

func (*Pinger) Privileged 

func (p *Pinger) Privileged() bool

Privileged returns whether pinger is running in privileged mode.

func (*Pinger) Resolve 

func (p *Pinger) Resolve() error

Resolve does the DNS lookup for the Pinger address and sets IP protocol.

func (*Pinger) Run 

func (p *Pinger) Run() error

Run runs the pinger. This is a blocking function that will exit when it's done. If Count or Interval are not specified, it will run continuously until it is interrupted.

func (*Pinger) RunWithContext 

func (p *Pinger) RunWithContext(ctx context.Context) error

RunWithContext runs the pinger with a context. This is a blocking function that will exit when it's done or if the context is canceled. If Count or Interval are not specified, it will run continuously until it is interrupted.

func (*Pinger) SetAddr 

func (p *Pinger) SetAddr(addr string) error

SetAddr resolves and sets the ip address of the target host, addr can be a DNS name like "www.google.com" or IP like "127.0.0.1".

func (*Pinger) SetDoNotFragment 

func (p *Pinger) SetDoNotFragment(df bool)

SetDoNotFragment sets the do-not-fragment bit in the outer IP header to the desired value.

func (*Pinger) SetID 

func (p *Pinger) SetID(id int)

SetID sets the ICMP identifier.

func (*Pinger) SetIPAddr 

func (p *Pinger) SetIPAddr(ipaddr *net.IPAddr)

SetIPAddr sets the ip address of the target host.

func (*Pinger) SetLogger 

func (p *Pinger) SetLogger(logger Logger)

SetLogger sets the logger to be used to log events from the pinger.

func (*Pinger) SetMark 

func (p *Pinger) SetMark(m uint)

SetMark sets a mark intended to be set on outgoing ICMP packets.

func (*Pinger) SetNetwork 

func (p *Pinger) SetNetwork(n string)

SetNetwork allows configuration of DNS resolution. * "ip" will automatically select IPv4 or IPv6. * "ip4" will select IPv4. * "ip6" will select IPv6.

func (*Pinger) SetPrivileged 

func (p *Pinger) SetPrivileged(privileged bool)

SetPrivileged sets the type of ping pinger will send. false means pinger will send an "unprivileged" UDP ping. true means pinger will send a "privileged" raw ICMP ping. NOTE: setting to true requires that it be run with super-user privileges.

func (*Pinger) Statistics 

func (p *Pinger) Statistics() *Statistics

Statistics returns the statistics of the pinger. This can be run while the pinger is running or after it is finished. OnFinish calls this function to get it's finished statistics.

func (*Pinger) Stop 

func (p *Pinger) Stop()

type Statistics 

type Statistics struct {
	// PacketsRecv is the number of packets received.
	PacketsRecv int

	// PacketsSent is the number of packets sent.
	PacketsSent int

	// PacketsRecvDuplicates is the number of duplicate responses there were to a sent packet.
	PacketsRecvDuplicates int

	// PacketLoss is the percentage of packets lost.
	PacketLoss float64

	// IPAddr is the address of the host being pinged.
	IPAddr *net.IPAddr

	// Addr is the string address of the host being pinged.
	Addr string

	// Rtts is all of the round-trip times sent via this pinger.
	Rtts []time.Duration

	// MinRtt is the minimum round-trip time sent via this pinger.
	MinRtt time.Duration

	// MaxRtt is the maximum round-trip time sent via this pinger.
	MaxRtt time.Duration

	// AvgRtt is the average round-trip time sent via this pinger.
	AvgRtt time.Duration

	// StdDevRtt is the standard deviation of the round-trip times sent via
	// this pinger.
	StdDevRtt time.Duration
}

Statistics represent the stats of a currently running or finished pinger operation.

type StdLogger 

type StdLogger struct {
	Logger *log.Logger
}

func (StdLogger) Debugf 

func (l StdLogger) Debugf(format string, v ...interface{})

func (StdLogger) Errorf 

func (l StdLogger) Errorf(format string, v ...interface{})

func (StdLogger) Fatalf 

func (l StdLogger) Fatalf(format string, v ...interface{})

func (StdLogger) Infof 

func (l StdLogger) Infof(format string, v ...interface{})

func (StdLogger) Warnf 

func (l StdLogger) Warnf(format string, v ...interface{})

Source Files

View all Source files

Directories

Path Synopsis
cmd
ping

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