func icmpEchoSender(c *icmp.PacketConn) {
timer := time.NewTicker(5 * time.Second)
for {
<-timer.C
// Collect IPs.
ips := make(map[string]bool)
for k, _ := range outSockets {
ipAndPort := strings.Split(k, ":")
ips[ipAndPort[0]] = true
}
// Send to all IPs.
for ip, _ := range ips {
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1,
Data: []byte("STRATUX"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Printf("couldn't send ICMP Echo: %s\n", err.Error())
continue
}
if _, err := c.WriteTo(wb, &net.IPAddr{IP: net.ParseIP(ip)}); err != nil {
log.Printf("couldn't send ICMP Echo: %s\n", err.Error())
continue
}
totalNetworkMessagesSent++
}
}
}
func (e *EchoRequest) Send() {
for i := 0; i < e.Count; i++ {
pkt := icmp.Message{
Type: ipv4.ICMPTypeEcho,
Code: 0,
Body: &icmp.Echo{
ID: e.Id,
Seq: i,
Data: []byte("raintank/go-pinger"),
},
}
wb, err := pkt.Marshal(nil)
if err != nil {
if e.pinger.Debug {
log.Printf("failed to marshal ICMP Echo packet. %s", err)
}
continue
}
sentTime, err := e.pinger.WritePkt(wb, e.Peer)
if err == nil {
e.Stats.Sent++
e.Stats.SentTime[i] = sentTime
if e.pinger.Debug {
log.Printf("go-pinger: sent pkt. Peer %s, Id: %d, Seq: %d, Sent: %s", e.Peer, e.Id, i, sentTime)
}
}
}
e.Listen()
}
func main() {
timeout := 5
t1 := time.Now()
c, err := icmp.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
checkError(err, "listen err, ")
}
c.SetDeadline(t1.Add(time.Second * time.Duration(timeout)))
defer c.Close()
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1,
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Fatal(err)
}
// Send ICMP echo and start timer
starttime := time.Now()
if _, err := c.WriteTo(wb, &net.IPAddr{IP: net.ParseIP(targetIP)}); err != nil {
log.Fatalf("WriteTo err, %s", err)
}
rb := make([]byte, 1500)
// Look for ICMP response and stop time
n, peer, err := c.ReadFrom(rb)
stoptime := time.Now()
if err != nil {
log.Fatal(err)
}
//rm, err := icmp.ParseMessage(iana.ProtocolICMP, rb[:n])
rm, err := icmp.ParseMessage(1, rb[:n])
if err != nil {
log.Fatal(err)
}
switch rm.Type {
case ipv4.ICMPTypeEchoReply:
log.Printf("got reflection from %v", peer)
log.Printf("ICMP echo request sent on ", starttime)
log.Printf("ICMP echo response received on ", stoptime)
default:
log.Printf("got %+v; want echo reply", rm)
}
}
func ping(listener *icmp.PacketConn, message icmp.Message, raddr net.Addr, timeout time.Duration) (Pong, error) {
data, err := message.Marshal(nil)
if err != nil {
return Pong{}, err
}
_, err = listener.WriteTo(data, raddr)
if err != nil {
return Pong{}, err
}
now := time.Now()
done := make(chan Pong)
go func() {
for {
buf := make([]byte, 10000)
// bufio
n, peer, err := listener.ReadFrom(buf)
if err != nil {
return
}
since := time.Since(now)
input, err := icmp.ParseMessage(protocolICMP, buf[:n])
if err != nil {
return
}
if input.Type != ipv4.ICMPTypeEchoReply {
continue
}
echo := input.Body.(*icmp.Echo)
pong := Pong{
Peer: peer,
ID: echo.ID,
Seq: echo.Seq,
Data: echo.Data,
Size: n,
RTT: since,
}
done <- pong
return
}
}()
select {
case pong := <-done:
return pong, nil
case <-time.After(timeout):
return Pong{}, errors.New("Timeout")
}
}
func ExamplePacketConn_nonPrivilegedPing() {
switch runtime.GOOS {
case "darwin":
case "linux":
log.Println("you may need to adjust the net.ipv4.ping_group_range kernel state")
default:
log.Println("not supported on", runtime.GOOS)
return
}
c, err := icmp.ListenPacket("udp6", "fe80::1%en0")
if err != nil {
log.Fatal(err)
}
defer c.Close()
wm := icmp.Message{
Type: ipv6.ICMPTypeEchoRequest, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1,
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Fatal(err)
}
if _, err := c.WriteTo(wb, &net.UDPAddr{IP: net.ParseIP("ff02::1"), Zone: "en0"}); err != nil {
log.Fatal(err)
}
rb := make([]byte, 1500)
n, peer, err := c.ReadFrom(rb)
if err != nil {
log.Fatal(err)
}
rm, err := icmp.ParseMessage(58, rb[:n])
if err != nil {
log.Fatal(err)
}
switch rm.Type {
case ipv6.ICMPTypeEchoReply:
log.Printf("got reflection from %v", peer)
default:
log.Printf("got %+v; want echo reply", rm)
}
}
func (i *ICMP) Write(b []byte) error {
message := icmp.Message{
Type: ipv4.ICMPTypeEcho,
Code: 0,
Body: &icmp.Echo{
Data: b,
},
}
outgoing, err := message.Marshal(nil)
if err != nil {
return err
}
_, err = i.listener.WriteTo(outgoing, i.raddr)
if err != nil {
return err
}
return nil
}
func Send_UDP_Ping(c *icmp.PacketConn, targetIP string, concurrent int, timeout int, ch_lock chan struct{}, rCache *ResultCache) {
ch_lock <- struct{}{}
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1,
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
return
}
timeForSend := time.Now()
c.SetReadDeadline(timeForSend.Add(time.Duration(timeout) * time.Second))
rCache.New(targetIP)
if _, err := c.WriteTo(wb, &net.UDPAddr{IP: net.ParseIP(targetIP)}); err != nil {
return
}
time.Sleep(time.Second)
<-ch_lock
}
func ExamplePacketConn_nonPrivilegedPing() {
c, err := icmp.ListenPacket("udp6", "fe80::1%en0")
if err != nil {
log.Fatal(err)
}
defer c.Close()
wm := icmp.Message{
Type: ipv6.ICMPTypeEchoRequest, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1,
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Fatal(err)
}
if _, err := c.WriteTo(wb, &net.UDPAddr{IP: net.ParseIP("ff02::1"), Zone: "en0"}); err != nil {
log.Fatal(err)
}
rb := make([]byte, 1500)
n, peer, err := c.ReadFrom(rb)
if err != nil {
log.Fatal(err)
}
rm, err := icmp.ParseMessage(iana.ProtocolIPv6ICMP, rb[:n])
if err != nil {
log.Fatal(err)
}
switch rm.Type {
case ipv6.ICMPTypeEchoReply:
log.Printf("got reflection from %v", peer)
default:
log.Printf("got %+v; want echo reply", rm)
}
}
// pingIcmp performs a ping to a destination. It select between ipv4 or ipv6 ping based
// on the format of the destination ip.
func (r Runner) pingIcmp() (err error) {
var (
icmpType icmp.Type
network string
)
if strings.Contains(r.Parameters.Destination, ":") {
network = "ip6:ipv6-icmp"
icmpType = ipv6.ICMPTypeEchoRequest
} else {
network = "ip4:icmp"
icmpType = ipv4.ICMPTypeEcho
}
c, err := net.Dial(network, r.Parameters.Destination)
if err != nil {
return fmt.Errorf("Dial failed: %v", err)
}
c.SetDeadline(time.Now().Add(time.Duration(r.Parameters.Timeout) * time.Second))
defer c.Close()
// xid is the process ID.
// Get process ID and make sure it fits in 16bits.
xid := os.Getpid() & 0xffff
// Sequence number of the packet.
xseq := 0
packet := icmp.Message{
Type: icmpType, // Type of icmp message
Code: 0, // icmp query messages use code 0
Body: &icmp.Echo{
ID: xid, // Packet id
Seq: xseq, // Sequence number of the packet
Data: bytes.Repeat([]byte("Ping!Ping!Ping!"), 3),
},
}
wb, err := packet.Marshal(nil)
if err != nil {
return fmt.Errorf("Connection failed: %v", err)
}
if _, err := c.Write(wb); err != nil {
return fmt.Errorf("Conn.Write Error: %v", err)
}
rb := make([]byte, 1500)
if _, err := c.Read(rb); err != nil {
// If connection timed out, we return E_Timeout
if e := err.(*net.OpError).Timeout(); e {
return fmt.Errorf(E_Timeout)
}
if strings.Contains(err.Error(), "connection refused") {
return fmt.Errorf(E_ConnRefused)
}
return fmt.Errorf("Conn.Read failed: %v", err)
}
_, err = icmp.ParseMessage(icmpType.Protocol(), rb)
if err != nil {
return fmt.Errorf("ParseICMPMessage failed: %v", err)
}
return
}
func ExamplePacketConn_tracingIPPacketRoute() {
// Tracing an IP packet route to www.google.com.
const host = "www.google.com"
ips, err := net.LookupIP(host)
if err != nil {
log.Fatal(err)
}
var dst net.IPAddr
for _, ip := range ips {
if ip.To4() != nil {
dst.IP = ip
fmt.Printf("using %v for tracing an IP packet route to %s\n", dst.IP, host)
break
}
}
if dst.IP == nil {
log.Fatal("no A record found")
}
c, err := net.ListenPacket(fmt.Sprintf("ip4:%d", iana.ProtocolICMP), "0.0.0.0") // ICMP for IPv4
if err != nil {
log.Fatal(err)
}
defer c.Close()
p := ipv4.NewPacketConn(c)
if err := p.SetControlMessage(ipv4.FlagTTL|ipv4.FlagSrc|ipv4.FlagDst|ipv4.FlagInterface, true); err != nil {
log.Fatal(err)
}
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff,
Data: []byte("HELLO-R-U-THERE"),
},
}
rb := make([]byte, 1500)
for i := 1; i <= 64; i++ { // up to 64 hops
wm.Body.(*icmp.Echo).Seq = i
wb, err := wm.Marshal(nil)
if err != nil {
log.Fatal(err)
}
if err := p.SetTTL(i); err != nil {
log.Fatal(err)
}
// In the real world usually there are several
// multiple traffic-engineered paths for each hop.
// You may need to probe a few times to each hop.
begin := time.Now()
if _, err := p.WriteTo(wb, nil, &dst); err != nil {
log.Fatal(err)
}
if err := p.SetReadDeadline(time.Now().Add(3 * time.Second)); err != nil {
log.Fatal(err)
}
n, cm, peer, err := p.ReadFrom(rb)
if err != nil {
if err, ok := err.(net.Error); ok && err.Timeout() {
fmt.Printf("%v\t*\n", i)
continue
}
log.Fatal(err)
}
rm, err := icmp.ParseMessage(iana.ProtocolICMP, rb[:n])
if err != nil {
log.Fatal(err)
}
rtt := time.Since(begin)
// In the real world you need to determine whether the
// received message is yours using ControlMessage.Src,
// ControlMessage.Dst, icmp.Echo.ID and icmp.Echo.Seq.
switch rm.Type {
case ipv4.ICMPTypeTimeExceeded:
names, _ := net.LookupAddr(peer.String())
fmt.Printf("%d\t%v %+v %v\n\t%+v\n", i, peer, names, rtt, cm)
case ipv4.ICMPTypeEchoReply:
names, _ := net.LookupAddr(peer.String())
fmt.Printf("%d\t%v %+v %v\n\t%+v\n", i, peer, names, rtt, cm)
return
default:
log.Printf("unknown ICMP message: %+v\n", rm)
}
}
}
func probeICMP(target string, w http.ResponseWriter, module Module) (success bool) {
deadline := time.Now().Add(module.Timeout)
socket, err := icmp.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
log.Errorf("Error listening to socket: %s", err)
return
}
defer socket.Close()
ip, err := net.ResolveIPAddr("ip4", target)
if err != nil {
log.Errorf("Error resolving address %s: %s", target, err)
return
}
seq := getICMPSequence()
pid := os.Getpid() & 0xffff
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: pid, Seq: int(seq),
Data: []byte("Prometheus Blackbox Exporter"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Errorf("Error marshalling packet for %s: %s", target, err)
return
}
if _, err := socket.WriteTo(wb, ip); err != nil {
log.Errorf("Error writing to socker for %s: %s", target, err)
return
}
rb := make([]byte, 1500)
if err := socket.SetReadDeadline(deadline); err != nil {
log.Errorf("Error setting socket deadline for %s: %s", target, err)
return
}
for {
n, peer, err := socket.ReadFrom(rb)
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
log.Infof("Timeout reading from socket for %s: %s", target, err)
return
}
log.Errorf("Error reading from socket for %s: %s", target, err)
continue
}
if peer.String() != ip.String() {
continue
}
rm, err := icmp.ParseMessage(iana.ProtocolICMP, rb[:n])
if err != nil {
log.Warnf("Error parsing ICMP message for %s: %s", target, err)
continue
}
if rm.Type == ipv4.ICMPTypeEchoReply {
// The ICMP package does not support unmarshalling
// messages, so assume this is the right sequence number.
success = true
return
}
}
return
}
func probeICMP(target string, w http.ResponseWriter, module Module) (success bool) {
var (
socket *icmp.PacketConn
requestType icmp.Type
replyType icmp.Type
fallbackProtocol string
)
deadline := time.Now().Add(module.Timeout)
// Defaults to IPv4 to be compatible with older versions
if module.ICMP.Protocol == "" {
module.ICMP.Protocol = "icmp"
}
// In case of ICMP prefer IPv6 by default
if module.ICMP.Protocol == "icmp" && module.ICMP.PreferredIpProtocol == "" {
module.ICMP.PreferredIpProtocol = "ip6"
}
if module.ICMP.Protocol == "icmp4" {
module.ICMP.PreferredIpProtocol = "ip4"
fallbackProtocol = ""
} else if module.ICMP.Protocol == "icmp6" {
module.ICMP.PreferredIpProtocol = "ip6"
fallbackProtocol = ""
} else if module.ICMP.PreferredIpProtocol == "ip6" {
fallbackProtocol = "ip4"
} else {
fallbackProtocol = "ip6"
}
ip, err := net.ResolveIPAddr(module.ICMP.PreferredIpProtocol, target)
if err != nil && fallbackProtocol != "" {
ip, err = net.ResolveIPAddr(fallbackProtocol, target)
}
if err != nil {
log.Errorf("Error resolving address %s: %s", target, err)
}
if ip.IP.To4() == nil {
requestType = ipv6.ICMPTypeEchoRequest
replyType = ipv6.ICMPTypeEchoReply
socket, err = icmp.ListenPacket("ip6:ipv6-icmp", "::")
fmt.Fprintf(w, "probe_ip_protocol 6\n")
} else {
requestType = ipv4.ICMPTypeEcho
replyType = ipv4.ICMPTypeEchoReply
socket, err = icmp.ListenPacket("ip4:icmp", "0.0.0.0")
fmt.Fprintf(w, "probe_ip_protocol 4\n")
}
if err != nil {
log.Errorf("Error listening to socket: %s", err)
return
}
defer socket.Close()
if err != nil {
log.Errorf("Error resolving address %s: %s", target, err)
return
}
seq := getICMPSequence()
pid := os.Getpid() & 0xffff
wm := icmp.Message{
Type: requestType,
Code: 0,
Body: &icmp.Echo{
ID: pid, Seq: int(seq),
Data: []byte("Prometheus Blackbox Exporter"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Errorf("Error marshalling packet for %s: %s", target, err)
return
}
if _, err := socket.WriteTo(wb, ip); err != nil {
log.Errorf("Error writing to socker for %s: %s", target, err)
return
}
// Reply should be the same except for the message type.
wm.Type = replyType
wb, err = wm.Marshal(nil)
if err != nil {
log.Errorf("Error marshalling packet for %s: %s", target, err)
return
}
rb := make([]byte, 1500)
if err := socket.SetReadDeadline(deadline); err != nil {
log.Errorf("Error setting socket deadline for %s: %s", target, err)
return
}
for {
n, peer, err := socket.ReadFrom(rb)
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
log.Infof("Timeout reading from socket for %s: %s", target, err)
return
}
log.Errorf("Error reading from socket for %s: %s", target, err)
continue
}
if peer.String() != ip.String() {
continue
}
if replyType == ipv6.ICMPTypeEchoReply {
// Clear checksum to make comparison succeed.
rb[2] = 0
rb[3] = 0
}
if bytes.Compare(rb[:n], wb) == 0 {
success = true
return
}
}
}
// Sends a single ICMP echo to an IP and returns success and latency information.
// Borrowed from BrianBrazil's blackbox exporter
func Ping(ip net.IP, maxRTT time.Duration) (success bool, latency time.Duration) {
deadline := time.Now().Add(maxRTT)
var socket *icmp.PacketConn
var err error
if isIPv4(ip) {
socket, err = icmp.ListenPacket("ip4:icmp", "0.0.0.0")
} else if isIPv6(ip) {
socket, err = icmp.ListenPacket("ip6:ipv6-icmp", "::")
} else {
log.Errorln("IP did not match any known types?")
return
}
if err != nil {
log.Errorf("Error listening to socket: %s", err)
return
}
defer socket.Close()
seq := getICMPSequence()
pid := os.Getpid() & 0xffff
// Build the packet
var wm icmp.Message
if isIPv4(ip) {
wm = icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: pid, Seq: int(seq),
Data: []byte("poller_exporter"),
},
}
} else if isIPv6(ip) {
wm = icmp.Message{
Type: ipv6.ICMPTypeEchoRequest, Code: 0,
Body: &icmp.Echo{
ID: pid, Seq: int(seq),
Data: []byte("poller_exporter"),
},
}
} else {
log.Errorln("IP did not match any known types?")
return
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Errorf("Error marshalling packet for %s: %s", ip.String(), err)
return
}
sendTime := time.Now()
var dst *net.IPAddr
dst = &net.IPAddr{IP: ip}
if _, err := socket.WriteTo(wb, dst); err != nil {
log.Errorf("Error writing to socket for %s: %s", ip.String(), err)
return
}
// Reply should be the same except for the message type.
if isIPv4(ip) {
wm.Type = ipv4.ICMPTypeEchoReply
} else if isIPv6(ip) {
wm.Type = ipv6.ICMPTypeEchoReply
} else {
log.Errorln("IP did not match any known types?")
return
}
wb, err = wm.Marshal(nil)
if err != nil {
log.Errorf("Error marshalling packet for %s: %s", ip.String(), err)
return
}
rb := make([]byte, 1500)
if err := socket.SetReadDeadline(deadline); err != nil {
log.Errorf("Error setting socket deadline for %s: %s", ip.String(), err)
return
}
for {
n, peer, err := socket.ReadFrom(rb)
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
log.Infof("Timeout reading from socket for %s: %s", ip.String(), err)
return
}
log.Errorf("Error reading from socket for %s: %s", ip.String(), err)
continue
}
if peer.String() != ip.String() {
continue
}
if bytes.Compare(rb[:n], wb) == 0 {
success = true
latency = time.Now().Sub(sendTime)
return
}
}
return
}
func doPing(host string, tt *Ping, seq int) error {
c, err := icmp.ListenPacket(tt.network, tt.address)
if err != nil {
return err
}
defer c.Close()
dst, err := getAddr(host, c, tt.protocol)
if err != nil {
return err
}
now := time.Now()
today := now.Truncate(24*time.Hour).UnixNano() / 1000000
transmitTime := uint32(now.UnixNano()/1000000 - today)
wm := icmp.Message{
Type: tt.mtype,
Code: 0,
Body: &Timestamp{
ID: os.Getpid() & 0xffff, Seq: 1 << uint(seq),
OriginTimestamp: transmitTime,
},
}
wb, err := wm.Marshal(nil)
if err != nil {
return err
}
if n, err := c.WriteTo(wb, dst); err != nil {
return err
} else if n != len(wb) {
return fmt.Errorf("got %v; want %v", n, len(wb))
}
rb := make([]byte, 1500)
if err := c.SetReadDeadline(time.Now().Add(3 * time.Second)); err != nil {
return err
}
n, peer, err := c.ReadFrom(rb)
if err != nil {
return err
}
receivedTime := time.Now().UnixNano()/1000000 - today
rm, err := icmp.ParseMessage(tt.protocol, rb[:n])
if err != nil {
return err
}
switch rm.Type {
case ipv4.ICMPTypeTimestampReply:
b, _ := rm.Body.Marshal(iana.ProtocolICMP)
ts, err := ParseTimestamp(b)
if err != nil {
fmt.Errorf("ParseTimestamp error: %s", err)
}
remoteReceiveTime := int64(ts.ReceiveTimestamp)
rtt := int64(math.Abs(float64(remoteReceiveTime - int64(transmitTime) + receivedTime - int64(ts.TransmitTimestamp))))
delta := rtt/2 + int64(transmitTime) - remoteReceiveTime
w := new(tabwriter.Writer)
w.Init(os.Stdout, 0, 4, 0, '\t', 0)
fmt.Fprintf(w, "ICMP timestamp:\tOriginate=%d Receive=%d Transmit=%d\n", ts.OriginTimestamp, ts.ReceiveTimestamp, ts.TransmitTimestamp)
fmt.Fprintf(w, "ICMP timestamp RTT:\ttsrtt=%d\n", rtt)
fmt.Fprintf(w, "Time difference:\tdelta=%d\n", delta)
w.Flush()
return nil
default:
return fmt.Errorf("got %+v from %v; want echo reply", rm, peer)
}
}
// Pinger pings requested address.
// It returns nil when IcmpEchoReplay is recived, error otherwishe.
func Pinger(address string, timeout time.Duration) (err error) {
addr, err := net.ResolveIPAddr("ip", address)
if err != nil {
return err
}
network := "ip4:icmp"
if addr.IP.To4() == nil {
network = "ip6:ipv6-icmp"
}
c, err := icmp.ListenPacket(network, address)
if err != nil {
return err
}
defer func() {
if cerr := c.Close(); cerr != nil && err == nil {
err = cerr
}
}()
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1,
Data: []byte("ping"),
},
}
if addr.IP.To4() == nil {
wm.Type = ipv6.ICMPTypeEchoRequest
}
wb, err := wm.Marshal(nil)
if err != nil {
return err
}
if err := c.SetDeadline(time.Now().Add(timeout)); err != nil {
return err
}
if _, err = c.WriteTo(wb, addr); err != nil {
return err
}
rb := make([]byte, 1500)
n, _, err := c.ReadFrom(rb)
if err != nil {
return err
}
rm, err := icmp.ParseMessage(ProtocolICMP, rb[:n])
if err != nil {
return err
}
if addr.IP.To4() == nil {
if rm.Type == ipv6.ICMPTypeEchoReply {
return ErrNoImcpReplay
}
return nil
}
if rm.Type == ipv4.ICMPTypeEchoReply {
return ErrNoImcpReplay
}
return nil
}
func probeICMP(target string, w http.ResponseWriter, module Module) (success bool) {
deadline := time.Now().Add(module.Timeout)
socket, err := icmp.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
log.Errorf("Error listening to socket: %s", err)
return
}
defer socket.Close()
ip, err := net.ResolveIPAddr("ip4", target)
if err != nil {
log.Errorf("Error resolving address %s: %s", target, err)
return
}
seq := getICMPSequence()
pid := os.Getpid() & 0xffff
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: pid, Seq: int(seq),
Data: []byte("Prometheus Blackbox Exporter"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Errorf("Error marshalling packet for %s: %s", target, err)
return
}
if _, err := socket.WriteTo(wb, ip); err != nil {
log.Errorf("Error writing to socker for %s: %s", target, err)
return
}
// Reply should be the same except for the message type.
wm.Type = ipv4.ICMPTypeEchoReply
wb, err = wm.Marshal(nil)
if err != nil {
log.Errorf("Error marshalling packet for %s: %s", target, err)
return
}
rb := make([]byte, 1500)
if err := socket.SetReadDeadline(deadline); err != nil {
log.Errorf("Error setting socket deadline for %s: %s", target, err)
return
}
for {
n, peer, err := socket.ReadFrom(rb)
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
log.Infof("Timeout reading from socket for %s: %s", target, err)
return
}
log.Errorf("Error reading from socket for %s: %s", target, err)
continue
}
if peer.String() != ip.String() {
continue
}
if bytes.Compare(rb[:n], wb) == 0 {
success = true
return
}
}
return
}
func TestPingGoogle(t *testing.T) {
if testing.Short() {
t.Skip("to avoid external network")
}
switch runtime.GOOS {
case "darwin":
case "linux":
t.Log("you may need to adjust the net.ipv4.ping_group_range kernel state")
default:
t.Skipf("not supported on %q", runtime.GOOS)
}
for i, tt := range pingGoogleTests {
if tt.network[:2] == "ip" && os.Getuid() != 0 {
continue
}
c, err := icmp.ListenPacket(tt.network, tt.address)
if err != nil {
t.Error(err)
continue
}
defer c.Close()
dst, err := googleAddr(c, tt.protocol)
if err != nil {
t.Error(err)
continue
}
wm := icmp.Message{
Type: tt.mtype, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1 << uint(i),
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
t.Error(err)
continue
}
if n, err := c.WriteTo(wb, dst); err != nil {
t.Error(err, dst)
continue
} else if n != len(wb) {
t.Errorf("got %v; want %v", n, len(wb))
continue
}
rb := make([]byte, 1500)
n, peer, err := c.ReadFrom(rb)
if err != nil {
t.Error(err)
continue
}
rm, err := icmp.ParseMessage(tt.protocol, rb[:n])
if err != nil {
t.Error(err)
continue
}
switch rm.Type {
case ipv4.ICMPTypeEchoReply, ipv6.ICMPTypeEchoReply:
t.Logf("got reflection from %v", peer)
default:
t.Errorf("got %+v; want echo reply", rm)
}
}
}
func doPing(tt pingTest, seq int) error {
c, err := icmp.ListenPacket(tt.network, tt.address)
if err != nil {
return err
}
defer c.Close()
dst, err := googleAddr(c, tt.protocol)
if err != nil {
return err
}
if tt.protocol == iana.ProtocolIPv6ICMP {
var f ipv6.ICMPFilter
f.SetAll(true)
f.Accept(ipv6.ICMPTypeDestinationUnreachable)
f.Accept(ipv6.ICMPTypePacketTooBig)
f.Accept(ipv6.ICMPTypeTimeExceeded)
f.Accept(ipv6.ICMPTypeParameterProblem)
f.Accept(ipv6.ICMPTypeEchoReply)
if err := c.IPv6PacketConn().SetICMPFilter(&f); err != nil {
return err
}
}
wm := icmp.Message{
Type: tt.mtype, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1 << uint(seq),
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
return err
}
if n, err := c.WriteTo(wb, dst); err != nil {
return err
} else if n != len(wb) {
return fmt.Errorf("got %v; want %v", n, len(wb))
}
rb := make([]byte, 1500)
if err := c.SetReadDeadline(time.Now().Add(3 * time.Second)); err != nil {
return err
}
n, peer, err := c.ReadFrom(rb)
if err != nil {
return err
}
rm, err := icmp.ParseMessage(tt.protocol, rb[:n])
if err != nil {
return err
}
switch rm.Type {
case ipv4.ICMPTypeEchoReply, ipv6.ICMPTypeEchoReply:
return nil
default:
return fmt.Errorf("got %+v from %v; want echo reply", rm, peer)
}
}