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@crgimenes crgimenes/main.go

Created May 21, 2020
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What would you like to do?
Detect server and client ip and port
package main
import (
"fmt"
"net"
"net/http"
"github.com/gorilla/mux"
)
func last(s string, b byte) int {
i := len(s)
for i--; i >= 0; i-- {
if s[i] == b {
break
}
}
return i
}
func splitHostZone(s string) (host, zone string) {
// The IPv6 scoped addressing zone identifier starts after the
// last percent sign.
if i := last(s, '%'); i > 0 {
host, zone = s[:i], s[i+1:]
return
}
host = s
return
}
func handleMain(w http.ResponseWriter, r *http.Request) {
fmt.Println("-=-=-=-=-=-=-=-=-=-=-=-=-=-")
// get server ip
adr := r.Context().Value(http.LocalAddrContextKey)
serverAddr, serverPort, err := net.SplitHostPort(
fmt.Sprintf("%v", adr))
if err != nil {
fmt.Println(err)
return
}
serverIP, serverZone := splitHostZone(serverAddr)
fmt.Println("server ip:", serverIP, "port:", serverPort)
fmt.Println("zone:", serverZone)
fmt.Println(net.JoinHostPort(serverIP, serverPort))
fmt.Println("-=-=-=-=-=-=-=-=-=-=-=-=-=-")
// get client ip
clientAddr, clientPort, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
fmt.Println(err)
return
}
clientIP, clientZone := splitHostZone(clientAddr)
fmt.Println("client ip:", clientIP, "port:", clientPort)
fmt.Println("zone:", clientZone)
fmt.Println(net.JoinHostPort(clientIP, clientPort))
}
func main() {
r := mux.NewRouter().StrictSlash(true)
r.HandleFunc("/", handleMain).Methods(http.MethodGet)
err := http.ListenAndServe(`:9090`, r)
if err != nil {
fmt.Println(err)
}
}
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