First commit

Makefile

@@ -0,0 +1,5 @@
+build:
+	CGO_ENABLED=0 go build -ldflags="-s -w" -o pingish
+
+run: build
+	./pingish -c 10 -host www.google.es

README.md

@@ -0,0 +1,14 @@
+Stupidly simple command line tool to resolve and ping hostnames.
+
+I just use the binary to troubleshoot connectivity issues in scratch/alpine containers that don't have ping/dig/curl/wget.
+Just copy the binary to the container, and problem solved.
+
+The binary has to be built with `CGO_ENABLED=0` to avoid problems with alpine-based images.
+
+# TROUBLESHOOTING
+
+To run it as a normal user in ubuntu, you might need to configure your host first: `sudo sysctl -w net.ipv4.ping_group_range="0   2147483647"` 
+
+And/or set the capabilities of the binary: `sudo setcap cap_net_raw=ep pingish`
+
+

go.mod

@@ -0,0 +1,6 @@
+module github.com/balkian/pingish
+
+require (
+	github.com/tatsushid/go-fastping v0.0.0-20160109021039-d7bb493dee3e
+	golang.org/x/net v0.0.0-20181017193950-04a2e542c03f // indirect
+)

go.sum

@@ -0,0 +1,4 @@
+github.com/tatsushid/go-fastping v0.0.0-20160109021039-d7bb493dee3e h1:nt2877sKfojlHCTOBXbpWjBkuWKritFaGIfgQwbQUls=
+github.com/tatsushid/go-fastping v0.0.0-20160109021039-d7bb493dee3e/go.mod h1:B4+Kq1u5FlULTjFSM707Q6e/cOHFv0z/6QRoxubDIQ8=
+golang.org/x/net v0.0.0-20181017193950-04a2e542c03f h1:4pRM7zYwpBjCnfA1jRmhItLxYJkaEnsmuAcRtA347DA=
+golang.org/x/net v0.0.0-20181017193950-04a2e542c03f/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=

main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net"
+	"os"
+	"time"
+
+	"github.com/tatsushid/go-fastping"
+)
+
+func main() {
+	name := flag.String("host", "www.google.es", "Hostname to ping")
+	count := flag.Int("c", 3, "Number of times to wait for the ")
+	flag.Parse()
+
+	adds, err := net.LookupHost(*name)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("List of addresses:")
+	for _, add := range adds {
+		fmt.Println("\t", add)
+	}
+
+	p := fastping.NewPinger()
+	ra, err := net.ResolveIPAddr("ip4:icmp", *name)
+	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)
+	}
+	for i := 0; i < *count; i++ {
+		err = p.Run()
+		if err != nil {
+			fmt.Println(err)
+		}
+	}
+	fmt.Println("finished")
+
+}