go-fastping
===========

go-fastping is a Go language ICMP ping library, inspired by the `AnyEvent::FastPing`
Perl module, for quickly sending ICMP ECHO REQUEST packets. Original Perl module
is available at http://search.cpan.org/~mlehmann/AnyEvent-FastPing-2.01/

All original functions haven't been implemented yet.

[![GoDoc](https://godoc.org/github.com/tatsushid/go-fastping?status.svg)](https://godoc.org/github.com/tatsushid/go-fastping)

## Installation

Install and update with `go get -u github.com/tatsushid/go-fastping`

## Examples

Import this package and write

```go
p := fastping.NewPinger()
ra, err := net.ResolveIPAddr("ip4:icmp", os.Args[1])
if err != nil {
	fmt.Println(err)
	os.Exit(1)
}
p.AddIPAddr(ra)
p.OnRecv = func(addr *net.IPAddr, rtt time.Duration) {
	fmt.Printf("IP Addr: %s receive, RTT: %v\n", addr.String(), rtt)
}
p.OnIdle = func() {
	fmt.Println("finish")
}
err = p.Run()
if err != nil {
	fmt.Println(err)
}
```

The example sends an ICMP packet and waits for a response. If it receives a
response, it calls the "receive" callback. After that, once MaxRTT time has
passed, it calls the "idle" callback. For more details,
refer [to the godoc][godoc], and if you need more examples,
please see "cmd/ping/ping.go".

## Caution
This package implements ICMP ping using both raw socket and UDP. If your program
uses this package in raw socket mode, it needs to be run as a root user.

## License
go-fastping is under MIT License. See the [LICENSE][license] file for details.

[godoc]: http://godoc.org/github.com/tatsushid/go-fastping
[license]: https://github.com/tatsushid/go-fastping/blob/master/LICENSE