Add a warning when run by root.

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
 ## UNRELEASED
+### Added
+- Add a warning when run by the user *root*.
 
 ## [v0.9.0] 2024-03-28
 ### Changed

main.go

@@ -15,6 +15,7 @@ import (
 	"net"
 	"os"
 	"os/signal"
+	osUser "os/user"
 	"runtime"
 	"strings"
 	"time"
@@ -171,6 +172,19 @@ func main() {
 		log.Fatal("Can't use message type headline for groupchat messages.")
 	}
 
+	// Get the current user.
+	currUser, err := osUser.Current()
+	if err != nil {
+		log.Fatal("Failed to get current user: ", err)
+	}
+	if currUser.Username == "root" {
+		fmt.Println("WARNING: It seems you are running go-sendxmpp as root user.\n" +
+			"This is is not recommended as go-sendxmpp does not require root " +
+			"privileges. Please consider using a less privileged user. For an " +
+			"example how to do this with sudo please consult the manpage chapter " +
+			"TIPS.")
+	}
+
 	switch *flagSCRAMPinning {
 	case "", "SCRAM-SHA-1", "SCRAM-SHA-1-PLUS", "SCRAM-SHA-256", "SCRAM-SHA-256-PLUS",
 		"SCRAM-SHA-512", "SCRAM-SHA-512-PLUS":