func Pinger(address *net.IPAddr, timeout time.Duration) error {
var (
c *net.IPConn
err error
)
v6 := address.IP.To4() == nil
if v6 {
c, err = net.DialIP("ip6:ipv6-icmp", nil, address)
} else {
c, err = net.DialIP("ip4:icmp", nil, address)
}
if err != nil {
return err
}
c.SetDeadline(time.Now().Add(timeout))
defer c.Close()
typ := icmpv4EchoRequest
if v6 {
typ = icmpv6EchoRequest
}
xid, xseq := os.Getpid()&0xffff, 1
wb, err := (&icmpMessage{
Type: typ, Code: 0,
Body: &icmpEcho{
ID: xid, Seq: xseq,
Data: bytes.Repeat([]byte("Go Go Gadget Ping!!!"), 3),
},
}).Marshal()
if err != nil {
return err
}
if _, err = c.Write(wb); err != nil {
return err
}
var m *icmpMessage
rb := make([]byte, 20+len(wb))
for {
if _, err = c.Read(rb); err != nil {
return err
}
if !v6 {
rb = ipv4Payload(rb)
}
if m, err = parseICMPMessage(rb); err != nil {
return err
}
switch m.Type {
case icmpv4EchoRequest, icmpv6EchoRequest:
continue
}
break
}
return nil
}
