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package main
import (
"io"
"os"
"net/http"
"net"
"strings"
)
func UnauthorizedIfNotLocal(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !isLocal(r.RemoteAddr) {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
Logger.Printf("Unauthorized request from: %s for %s",
r.RemoteAddr, r.RequestURI)
return
}
h.ServeHTTP(w, r)
})
}
func isLocal(addr string) bool {
_, localNet, _ := net.ParseCIDR("127.0.0.1/8")
return localNet.Contains(net.ParseIP(strings.Split(addr, ":")[0]))
}
// getHostIP attempts to guess the IP address of the current machine and
// returns that. Simply bails at the first non sane looking IP and returns it.
// Not ideal but it should work well enough most of the time
func getHostIP() string {
iFaces, err := net.Interfaces()
if err != nil {
return "127.0.0.1"
}
// RFC 3927
_, ipv4LinkLocal, _ := net.ParseCIDR("169.254.0.0/16")
for _, iFace := range iFaces {
addrs, err := iFace.Addrs()
if err != nil {
return "127.0.0.1"
}
for _, a := range addrs {
n, ok := a.(*net.IPNet)
if !ok {
continue
}
if n.IP.To4() != nil && !n.IP.IsLoopback() && !ipv4LinkLocal.Contains(n.IP.To4()) {
return n.IP.String()
}
}
}
return "127.0.0.1"
}
func getPort() string {
s := strings.Split(Listen, ":")
if len(s) != 2 {
return Listen
}
return s[1]
}
func serveSelf(w http.ResponseWriter, r *http.Request) {
s, err := os.Executable()
if err != nil {
Logger.Println("While trying to get my executable path: ", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
fh, err := os.Open(s)
if err != nil {
Logger.Println("While opening my own executable for reading: ", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
_, err = io.Copy(w, fh)
fh.Close()
return
}
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