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Lgproxy auto retry with different protocol version

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This commit is contained in:
Lan Tian 2020-04-09 23:04:30 +08:00
parent 77873d6835
commit 0218fd5c1a
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GPG Key ID: 27F31700E751EC22
1 changed files with 86 additions and 28 deletions
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114
proxy/traceroute.go
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@ -17,59 +17,117 @@ func tracerouteIPv6Wrapper(httpW http.ResponseWriter, httpR *http.Request) {
tracerouteRealHandler(true, httpW, httpR) tracerouteRealHandler(true, httpW, httpR)
} }
func tracerouteTryExecute(cmd []string, args [][]string) ([]byte, error) {
var output []byte
var err error
for i := range cmd {
instance := exec.Command(cmd[i], args[i]...)
output, err = instance.Output()
if err == nil {
return output, err
}
}
return output, err
}
// Real handler of traceroute requests // Real handler of traceroute requests
func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.Request) { func tracerouteRealHandler(useIPv6 bool, httpW http.ResponseWriter, httpR *http.Request) {
query := string(httpR.URL.Query().Get("q")) query := string(httpR.URL.Query().Get("q"))
if query == "" { if query == "" {
invalidHandler(httpW, httpR) invalidHandler(httpW, httpR)
} else { } else {
var cmd string var result []byte
var args []string var err error
if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" { if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" {
if useIPv6 { if useIPv6 {
cmd = "traceroute6" result, err = tracerouteTryExecute(
[]string{
"traceroute6",
"traceroute",
},
[][]string{
{"-a", "-q1", "-w1", query},
{"-a", "-q1", "-w1", query},
},
)
} else { } else {
cmd = "traceroute" result, err = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute6",
},
[][]string{
{"-a", "-q1", "-w1", query},
{"-a", "-q1", "-w1", query},
},
)
} }
args = []string{"-a", "-q1", "-w1", "-m15", query}
} else if runtime.GOOS == "openbsd" { } else if runtime.GOOS == "openbsd" {
if useIPv6 { if useIPv6 {
cmd = "traceroute6" result, err = tracerouteTryExecute(
[]string{
"traceroute6",
"traceroute",
},
[][]string{
{"-A", "-q1", "-w1", query},
{"-A", "-q1", "-w1", query},
},
)
} else { } else {
cmd = "traceroute" result, err = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute6",
},
[][]string{
{"-A", "-q1", "-w1", query},
{"-A", "-q1", "-w1", query},
},
)
} }
args = []string{"-A", "-q1", "-w1", "-m15", query}
} else if runtime.GOOS == "linux" { } else if runtime.GOOS == "linux" {
cmd = "traceroute"
if useIPv6 { if useIPv6 {
args = []string{"-6", "-A", "-q1", "-N32", "-w1", "-m15", query} result, err = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute",
"traceroute",
"traceroute",
},
[][]string{
{"-6", "-A", "-q1", "-N32", "-w1", query},
{"-4", "-A", "-q1", "-N32", "-w1", query},
{"-6", "-q1", "-w1", query},
{"-4", "-q1", "-w1", query},
},
)
} else { } else {
args = []string{"-4", "-A", "-q1", "-N32", "-w1", "-m15", query} result, err = tracerouteTryExecute(
[]string{
"traceroute",
"traceroute",
"traceroute",
"traceroute",
},
[][]string{
{"-4", "-A", "-q1", "-N32", "-w1", query},
{"-6", "-A", "-q1", "-N32", "-w1", query},
{"-4", "-q1", "-w1", query},
{"-6", "-q1", "-w1", query},
},
)
} }
} else { } else {
httpW.WriteHeader(http.StatusInternalServerError) httpW.WriteHeader(http.StatusInternalServerError)
httpW.Write([]byte("traceroute binary not installed on this node.\n")) httpW.Write([]byte("traceroute not supported on this node.\n"))
return return
} }
instance := exec.Command(cmd, args...)
output, err := instance.Output()
if err != nil && runtime.GOOS == "linux" {
// Standard traceroute utility failed, maybe system using busybox
// Run with less parameters
cmd = "traceroute"
if useIPv6 {
args = []string{"-6", "-q1", "-w1", "-m15", query}
} else {
args = []string{"-4", "-q1", "-w1", "-m15", query}
}
instance = exec.Command(cmd, args...)
output, err = instance.Output()
}
if err != nil { if err != nil {
httpW.WriteHeader(http.StatusInternalServerError) httpW.WriteHeader(http.StatusInternalServerError)
httpW.Write([]byte(fmt.Sprintln("traceroute returned error:", err.Error(), ", please check if IPv4/IPv6 is selected correctly on top."))) httpW.Write([]byte(fmt.Sprintln("traceroute returned error:", err.Error(), ", please check if IPv4/IPv6 is selected correctly.")))
return return
} }
httpW.Write(output) httpW.Write(result)
} }
} }