Added showHostKey function

Main.go

@@ -3,8 +3,10 @@ package main
 import (
 	"fmt"
 	"log"
+	"net"
 	"os"
 	"runtime"
+	"time"
 
 	"github.com/SommerEngineering/Sync/Sync"
 	"github.com/howeyc/gopass"
@@ -14,7 +16,7 @@ import (
 func main() {
 
 	// Show the current version:
-	log.Println(`Sync v1.3.0`)
+	log.Println(`Sync v1.3.1`)
 
 	// Allow Go to use all CPUs:
 	runtime.GOMAXPROCS(runtime.NumCPU())
@@ -97,6 +99,7 @@ func main() {
 			ssh.PasswordCallback(Sync.PasswordCallback),
 			ssh.KeyboardInteractive(Sync.KeyboardInteractiveChallenge),
 		},
+		HostKeyCallback: showHostKey(),
 	}
 
 	// Connect to the SSH server:
@@ -111,3 +114,11 @@ func main() {
 	Sync.Synchronise(ssh, supervised, pushOnly, localDir, remoteDir)
 	log.Println("Synchronising done.")
 }
+
+func showHostKey() ssh.HostKeyCallback {
+	return func(hostname string, remote net.Addr, key ssh.PublicKey) error {
+		log.Printf("Your server's hostname is %s (%s) and its public key is %s. If this is wrong, please abort the program now! Wait 16 seconds for your check.", hostname, remote.String(), ssh.FingerprintSHA256(key))
+		time.Sleep(16 * time.Second)
+		return nil
+	}
+}