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ping_notwindows.go
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ping_notwindows.go
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//go:build !windows
// +build !windows
package ping
import (
"errors"
"fmt"
"os/exec"
"regexp"
"runtime"
"strconv"
"strings"
"syscall"
"github.com/influxdata/telegraf"
)
func (p *Ping) pingToURL(u string, acc telegraf.Accumulator) {
tags := map[string]string{"url": u}
fields := map[string]interface{}{"result_code": 0}
out, err := p.pingHost(p.Binary, 60.0, p.args(u, runtime.GOOS)...)
if err != nil {
// Some implementations of ping return a non-zero exit code on
// timeout, if this occurs we will not exit and try to parse
// the output.
// Linux iputils-ping returns 1, BSD-derived ping returns 2.
status := -1
if exitError, ok := err.(*exec.ExitError); ok {
if ws, ok := exitError.Sys().(syscall.WaitStatus); ok {
status = ws.ExitStatus()
fields["result_code"] = status
}
}
var timeoutExitCode int
switch runtime.GOOS {
case "freebsd", "netbsd", "openbsd", "darwin":
timeoutExitCode = 2
case "linux":
timeoutExitCode = 1
default:
timeoutExitCode = 1
}
if status != timeoutExitCode {
// Combine go err + stderr output
out = strings.TrimSpace(out)
if len(out) > 0 {
acc.AddError(fmt.Errorf("host %s: %s, %s", u, out, err))
} else {
acc.AddError(fmt.Errorf("host %s: %s", u, err))
}
fields["result_code"] = 2
acc.AddFields("ping", fields, tags)
return
}
}
stats, err := processPingOutput(out)
if err != nil {
// fatal error
acc.AddError(fmt.Errorf("%s: %s", err, u))
fields["result_code"] = 2
acc.AddFields("ping", fields, tags)
return
}
// Calculate packet loss percentage
loss := float64(stats.trans-stats.recv) / float64(stats.trans) * 100.0
fields["packets_transmitted"] = stats.trans
fields["packets_received"] = stats.recv
fields["percent_packet_loss"] = loss
if stats.ttl >= 0 {
fields["ttl"] = stats.ttl
}
if stats.min >= 0 {
fields["minimum_response_ms"] = stats.min
}
if stats.avg >= 0 {
fields["average_response_ms"] = stats.avg
}
if stats.max >= 0 {
fields["maximum_response_ms"] = stats.max
}
if stats.stddev >= 0 {
fields["standard_deviation_ms"] = stats.stddev
}
acc.AddFields("ping", fields, tags)
}
// args returns the arguments for the 'ping' executable
func (p *Ping) args(url string, system string) []string {
if len(p.Arguments) > 0 {
return append(p.Arguments, url)
}
// build the ping command args based on toml config
args := []string{"-c", strconv.Itoa(p.Count), "-n", "-s", "16"}
if p.PingInterval > 0 {
args = append(args, "-i", strconv.FormatFloat(p.PingInterval, 'f', -1, 64))
}
if p.Timeout > 0 {
switch system {
case "darwin":
args = append(args, "-W", strconv.FormatFloat(p.Timeout*1000, 'f', -1, 64))
case "freebsd":
if strings.Contains(p.Binary, "ping6") {
args = append(args, "-x", strconv.FormatFloat(p.Timeout*1000, 'f', -1, 64))
} else {
args = append(args, "-W", strconv.FormatFloat(p.Timeout*1000, 'f', -1, 64))
}
case "netbsd", "openbsd":
args = append(args, "-W", strconv.FormatFloat(p.Timeout*1000, 'f', -1, 64))
case "linux":
args = append(args, "-W", strconv.FormatFloat(p.Timeout, 'f', -1, 64))
default:
// Not sure the best option here, just assume GNU ping?
args = append(args, "-W", strconv.FormatFloat(p.Timeout, 'f', -1, 64))
}
}
if p.Deadline > 0 {
switch system {
case "freebsd":
if strings.Contains(p.Binary, "ping6") {
args = append(args, "-X", strconv.Itoa(p.Deadline))
} else {
args = append(args, "-t", strconv.Itoa(p.Deadline))
}
case "darwin", "netbsd", "openbsd":
args = append(args, "-t", strconv.Itoa(p.Deadline))
case "linux":
args = append(args, "-w", strconv.Itoa(p.Deadline))
default:
// not sure the best option here, just assume gnu ping?
args = append(args, "-w", strconv.Itoa(p.Deadline))
}
}
if p.Interface != "" {
switch system {
case "darwin":
args = append(args, "-I", p.Interface)
case "freebsd", "netbsd", "openbsd":
args = append(args, "-S", p.Interface)
case "linux":
args = append(args, "-I", p.Interface)
default:
// not sure the best option here, just assume gnu ping?
args = append(args, "-i", p.Interface)
}
}
args = append(args, url)
return args
}
// processPingOutput takes in a string output from the ping command, like:
//
// ping www.google.com (173.194.115.84): 56 data bytes
// 64 bytes from 173.194.115.84: icmp_seq=0 ttl=54 time=52.172 ms
// 64 bytes from 173.194.115.84: icmp_seq=1 ttl=54 time=34.843 ms
//
// --- www.google.com ping statistics ---
// 2 packets transmitted, 2 packets received, 0.0% packet loss
// round-trip min/avg/max/stddev = 34.843/43.508/52.172/8.664 ms
//
// It returns (<transmitted packets>, <received packets>, <average response>)
func processPingOutput(out string) (stats, error) {
stats := stats{
trans: 0,
recv: 0,
ttl: -1,
roundTripTimeStats: roundTripTimeStats{
min: -1.0,
avg: -1.0,
max: -1.0,
stddev: -1.0,
},
}
// Set this error to nil if we find a 'transmitted' line
err := errors.New("fatal error processing ping output")
lines := strings.Split(out, "\n")
for _, line := range lines {
// Reading only first TTL, ignoring other TTL messages
if stats.ttl == -1 && (strings.Contains(line, "ttl=") || strings.Contains(line, "hlim=")) {
stats.ttl, err = getTTL(line)
} else if strings.Contains(line, "transmitted") && strings.Contains(line, "received") {
stats.trans, stats.recv, err = getPacketStats(line)
if err != nil {
return stats, err
}
} else if strings.Contains(line, "min/avg/max") {
stats.roundTripTimeStats, err = checkRoundTripTimeStats(line)
if err != nil {
return stats, err
}
}
}
return stats, err
}
func getPacketStats(line string) (trans int, recv int, err error) {
trans, recv = 0, 0
stats := strings.Split(line, ", ")
// Transmitted packets
trans, err = strconv.Atoi(strings.Split(stats[0], " ")[0])
if err != nil {
return trans, recv, err
}
// Received packets
recv, err = strconv.Atoi(strings.Split(stats[1], " ")[0])
return trans, recv, err
}
func getTTL(line string) (int, error) {
ttlLine := regexp.MustCompile(`(ttl|hlim)=(\d+)`)
ttlMatch := ttlLine.FindStringSubmatch(line)
return strconv.Atoi(ttlMatch[2])
}
func checkRoundTripTimeStats(line string) (roundTripTimeStats, error) {
roundTripTimeStats := roundTripTimeStats{
min: -1.0,
avg: -1.0,
max: -1.0,
stddev: -1.0,
}
stats := strings.Split(line, " ")[3]
data := strings.Split(stats, "/")
var err error
roundTripTimeStats.min, err = strconv.ParseFloat(data[0], 64)
if err != nil {
return roundTripTimeStats, err
}
roundTripTimeStats.avg, err = strconv.ParseFloat(data[1], 64)
if err != nil {
return roundTripTimeStats, err
}
roundTripTimeStats.max, err = strconv.ParseFloat(data[2], 64)
if err != nil {
return roundTripTimeStats, err
}
if len(data) == 4 {
roundTripTimeStats.stddev, err = strconv.ParseFloat(data[3], 64)
if err != nil {
return roundTripTimeStats, err
}
}
return roundTripTimeStats, err
}