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proxy: output errors of all attempts when failing

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This commit is contained in:
Lan Tian 2020-09-19 17:54:10 +08:00
parent 7f5ea89a14
commit 1a8c7b6e6b
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GPG Key ID: 27F31700E751EC22
1 changed files with 17 additions and 13 deletions
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30
proxy/traceroute.go
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@ -18,17 +18,21 @@ func tracerouteIPv6Wrapper(httpW http.ResponseWriter, httpR *http.Request) {
tracerouteRealHandler(true, httpW, httpR)
}
func tracerouteTryExecute(cmd []string, args [][]string) ([]byte, error) {
func tracerouteTryExecute(cmd []string, args [][]string) ([]byte, string) {
var output []byte
var err error
var errString = ""
for i := range cmd {
var err error
var cmdCombined = cmd[i] + " " + strings.Join(args[i], " ")
instance := exec.Command(cmd[i], args[i]...)
output, err = instance.CombinedOutput()
if err == nil {
return output, err
return output, ""
}
errString += fmt.Sprintf("+ (Try %d) %s\n%s\n\n", (i + 1), cmdCombined, err.Error())
}
return output, err
return output, errString
}
// Real handler of traceroute requests
@ -39,10 +43,10 @@ func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.
invalidHandler(httpW, httpR)
} else {
var result []byte
var err error
var errString string
if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" {
if useIPv6 {
result, err = tracerouteTryExecute(
result, errString = tracerouteTryExecute(
[]string{
"traceroute6",
"traceroute",
@ -53,7 +57,7 @@ func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.
},
)
} else {
result, err = tracerouteTryExecute(
result, errString = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute6",
@ -66,7 +70,7 @@ func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.
}
} else if runtime.GOOS == "openbsd" {
if useIPv6 {
result, err = tracerouteTryExecute(
result, errString = tracerouteTryExecute(
[]string{
"traceroute6",
"traceroute",
@ -77,7 +81,7 @@ func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.
},
)
} else {
result, err = tracerouteTryExecute(
result, errString = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute6",
@ -90,7 +94,7 @@ func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.
}
} else if runtime.GOOS == "linux" {
if useIPv6 {
result, err = tracerouteTryExecute(
result, errString = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute",
@ -106,7 +110,7 @@ func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.
},
)
} else {
result, err = tracerouteTryExecute(
result, errString = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute",
@ -127,9 +131,9 @@ func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.
httpW.Write([]byte("traceroute not supported on this node.\n"))
return
}
if err != nil {
if errString != "" {
httpW.WriteHeader(http.StatusInternalServerError)
httpW.Write([]byte(fmt.Sprintln("traceroute returned error:", err.Error(), ".")))
httpW.Write([]byte("traceroute returned error:\n" + errString))
}
httpW.Write(result)
}