76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
package main
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import (
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"fmt"
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"net/http"
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"os/exec"
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"runtime"
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)
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// Wrapper of traceroute, IPv4
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func tracerouteIPv4Wrapper(httpW http.ResponseWriter, httpR *http.Request) {
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tracerouteRealHandler(false, httpW, httpR)
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}
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// Wrapper of traceroute, IPv6
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func tracerouteIPv6Wrapper(httpW http.ResponseWriter, httpR *http.Request) {
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tracerouteRealHandler(true, httpW, httpR)
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}
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// Real handler of traceroute requests
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func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.Request) {
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query := string(httpR.URL.Query().Get("q"))
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if query == "" {
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invalidHandler(httpW, httpR)
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} else {
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var cmd string
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var args []string
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if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" {
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if useIPv6 {
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cmd = "traceroute6"
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} else {
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cmd = "traceroute"
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}
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args = []string{"-a", "-q1", "-w1", "-m15", query}
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} else if runtime.GOOS == "openbsd" {
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if useIPv6 {
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cmd = "traceroute6"
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} else {
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cmd = "traceroute"
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}
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args = []string{"-A", "-q1", "-w1", "-m15", query}
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} else if runtime.GOOS == "linux" {
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cmd = "traceroute"
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if useIPv6 {
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args = []string{"-6", "-A", "-q1", "-N32", "-w1", "-m15", query}
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} else {
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args = []string{"-4", "-A", "-q1", "-N32", "-w1", "-m15", query}
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}
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} else {
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httpW.WriteHeader(http.StatusInternalServerError)
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httpW.Write([]byte("traceroute binary not installed on this node.\n"))
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return
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}
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instance := exec.Command(cmd, args...)
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output, err := instance.Output()
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if err != nil && runtime.GOOS == "linux" {
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// Standard traceroute utility failed, maybe system using busybox
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// Run with less parameters
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cmd = "traceroute"
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if useIPv6 {
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args = []string{"-6", "-q1", "-w1", "-m15", query}
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} else {
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args = []string{"-4", "-q1", "-w1", "-m15", query}
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}
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instance = exec.Command(cmd, args...)
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output, err = instance.Output()
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}
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if err != nil {
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httpW.WriteHeader(http.StatusInternalServerError)
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httpW.Write([]byte(fmt.Sprintln("traceroute returned error:", err.Error(), ", please check if IPv4/IPv6 is selected correctly on top.")))
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return
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}
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httpW.Write(output)
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}
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}
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