main: show message when listening on network (#836)

fixes: #739

llama-swap.go

@@ -6,6 +6,7 @@ import (
 	"flag"
 	"fmt"
 	"log/slog"
+	"net"
 	"net/http"
 	"os"
 	"os/signal"
@@ -53,6 +54,7 @@ var logTimeFormats = map[string]string{
 	"stampnano":   time.StampNano,
 }
 
+
 func main() {
 	flagConfig := flag.String("config", "", "path to config file (required)")
 	flagListen := flag.String("listen", "", "listen address (default :8080 or :8443 for TLS)")
@@ -262,6 +264,11 @@ func main() {
 		}
 	}()
 
+	if !shared.IsLoopbackAddr(listenAddr) {
+		_, port, _ := net.SplitHostPort(listenAddr)
+		proxyLog.Infof("llama-swap is reachable by all hosts on the network, use -listen localhost:%s to restrict to loopback only", port)
+	}
+
 	exitChan := make(chan struct{})
 
 	go func() {