97 lines
2.9 KiB
Go
97 lines
2.9 KiB
Go
package main
|
|
|
|
import (
|
|
"flag"
|
|
"net/http"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/gorilla/handlers"
|
|
)
|
|
|
|
// Check if a byte is character for number
|
|
func isNumeric(b byte) bool {
|
|
return b >= byte('0') && b <= byte('9')
|
|
}
|
|
|
|
// Default handler, returns 500 Internal Server Error
|
|
func invalidHandler(httpW http.ResponseWriter, httpR *http.Request) {
|
|
httpW.WriteHeader(http.StatusInternalServerError)
|
|
httpW.Write([]byte("Invalid Request\n"))
|
|
}
|
|
|
|
// Access handler, check to see if client IP in allowed IPs, continue if it is, send to invalidHandler if not
|
|
func accessHandler(next http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(httpW http.ResponseWriter, httpR *http.Request) {
|
|
|
|
// setting.allowedIPs will always have at least one element because of how it's defined
|
|
if setting.allowedIPs[0] == "" {
|
|
next.ServeHTTP(httpW, httpR)
|
|
return
|
|
}
|
|
|
|
IPPort := httpR.RemoteAddr
|
|
|
|
// Remove port from IP and remove brackets that are around IPv6 addresses
|
|
requestIp := IPPort[0:strings.LastIndex(IPPort, ":")]
|
|
requestIp = strings.Replace(requestIp, "[", "", -1)
|
|
requestIp = strings.Replace(requestIp, "]", "", -1)
|
|
|
|
for _, allowedIP := range setting.allowedIPs {
|
|
if requestIp == allowedIP {
|
|
next.ServeHTTP(httpW, httpR)
|
|
return
|
|
}
|
|
}
|
|
|
|
invalidHandler(httpW, httpR)
|
|
return
|
|
})
|
|
}
|
|
|
|
type settingType struct {
|
|
birdSocket string
|
|
listen string
|
|
allowedIPs []string
|
|
}
|
|
|
|
var setting settingType
|
|
|
|
// Wrapper of tracer
|
|
func main() {
|
|
// Prepare default socket paths, use environment variable if possible
|
|
var settingDefault = settingType{
|
|
"/var/run/bird/bird.ctl",
|
|
":8000",
|
|
[]string{""},
|
|
}
|
|
|
|
if birdSocketEnv := os.Getenv("BIRD_SOCKET"); birdSocketEnv != "" {
|
|
settingDefault.birdSocket = birdSocketEnv
|
|
}
|
|
if listenEnv := os.Getenv("BIRDLG_LISTEN"); listenEnv != "" {
|
|
settingDefault.listen = listenEnv
|
|
}
|
|
if AllowedIPsEnv := os.Getenv("ALLOWED_IPS"); AllowedIPsEnv != "" {
|
|
settingDefault.allowedIPs = strings.Split(AllowedIPsEnv, ",")
|
|
}
|
|
|
|
// Allow parameters to override environment variables
|
|
birdParam := flag.String("bird", settingDefault.birdSocket, "socket file for bird, set either in parameter or environment variable BIRD_SOCKET")
|
|
listenParam := flag.String("listen", settingDefault.listen, "listen address, set either in parameter or environment variable BIRDLG_LISTEN")
|
|
AllowedIPsParam := flag.String("allowed", strings.Join(settingDefault.allowedIPs, ","), "IPs allowed to access this proxy, separated by commas. Don't set to allow all IPs.")
|
|
flag.Parse()
|
|
|
|
setting.birdSocket = *birdParam
|
|
setting.listen = *listenParam
|
|
setting.allowedIPs = strings.Split(*AllowedIPsParam, ",")
|
|
|
|
// Start HTTP server
|
|
http.HandleFunc("/", invalidHandler)
|
|
http.HandleFunc("/bird", birdHandler)
|
|
http.HandleFunc("/bird6", birdHandler)
|
|
http.HandleFunc("/traceroute", tracerouteHandler)
|
|
http.HandleFunc("/traceroute6", tracerouteHandler)
|
|
http.ListenAndServe(*listenParam, handlers.LoggingHandler(os.Stdout, accessHandler(http.DefaultServeMux)))
|
|
}
|