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dokokara.go
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/
dokokara.go
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package main
import (
"fmt"
"log"
"net"
"net/http"
"os"
)
func doko(w http.ResponseWriter, r *http.Request) {
var ip string
ip = r.Header.Get("X-Forwarded-For")
if ip == "" {
var err error
ip, _, err = net.SplitHostPort(r.RemoteAddr)
if err != nil {
log.Println("SplitHostPort error: ", err)
fmt.Fprint(w, "IP: ???\nHost: ???")
return
}
}
log.Println("IP: ", ip)
host, err := net.LookupAddr(ip)
if err != nil {
log.Println("LookupAddr error: ", err)
fmt.Fprintf(w, "IP: %s\nHost: ???", ip)
return
}
log.Println("Host: ", host)
fmt.Fprintf(w, "IP: %s\nHost: %s", ip, host[0])
}
func main() {
port := os.Getenv("PORT")
if port == "" {
log.Fatal("$PORT must be set")
}
http.HandleFunc("/", doko)
err := http.ListenAndServe(":"+port, nil)
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
}