process: sleep for 2 seconds on wrong password

To make guessing the password of the webserver more expensive wait for two
seconds before accepting the next password.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

src/process.c

@@ -30,6 +30,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <unistd.h>
 #include <usb.h>
 #include "config.h"
 #include "sispm_ctl.h"
@@ -66,6 +67,8 @@ static void unauthorized(int out)
 {
   char xbuffer[BSIZE+2];
 
+  /* Sleep here to make password guessing more expensive */
+  usleep(2000000);
   sprintf(xbuffer,
           "HTTP/1.1 401 Unauthorized\nServer: SisPM\n"
           "WWW-Authenticate: Basic realm=\"SisPM\n\""