error mgmt

dhcp_protect.c

-// dhcp_protect.c
+//   DHCP Protect
+//
 //   Copyright 2019 Pascal Gloor
 //
 //   Licensed under the Apache License, Version 2.0 (the "License");
 		static char buf[65536];
 		int rv;
 
-		if ((rv = recv(fd, buf, sizeof(buf), 0)) >= 0) {
-			nfq_handle_packet(h, buf, rv); /* send packet to callback */
+		rv = recv(fd, buf, sizeof(buf), 0);
+
+		switch(rv) {
+			case -1:
+				fprintf(stderr, "recv() error: %s\n", strerror(errno));
+				return;
+			case 0:
+				fprintf(stderr,"socket is closed!?\n");
+				return;
+			default:
+				// send packet to callback
+				nfq_handle_packet(h, buf, rv);
+				break;
 		}
 	}
 }