--- client_side.c.orig	2004-02-18 20:51:16.000000000 +0200
+++ client_side.c	2004-02-20 21:24:52.000000000 +0200
@@ -1971,6 +1971,37 @@
 	return;
     }
     if (http->out.offset == 0) {
+	/* Zero Penalty Patch (ZPH) begins here ----> */
+	int hit = 0;
+	switch ( http->log_type )
+	{
+		case LOG_TCP_HIT:
+		case LOG_TCP_REFRESH_HIT:
+		case LOG_TCP_REFRESH_FAIL_HIT:
+		case LOG_TCP_IMS_HIT:
+		case LOG_TCP_MEM_HIT:
+		case LOG_TCP_OFFLINE_HIT:
+			hit = 1;
+			debug(33, 5) ("ZPH: local hit\n");
+			break;
+		default:
+			/* Remove next 4 lines for excluding neighbor hits */
+			if ( http->request->hier.code == PARENT_HIT || http->request->hier.code == SIBLING_HIT ) {
+				hit = 1;
+				debug(33, 5) ("ZPH: neighbor hit\n");
+			}
+			break;
+	}
+	if ( hit ) {
+		int tos = 16;	/* iptables hint: TOS = 0x10, DSCP = 0x04 */
+		enter_suid();
+		if (setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
+			debug(50, 1) ("ZPH: setsockopt(IP_TOS) on FD %d: %s\n", fd, xstrerror());
+		}
+		leave_suid();
+	}
+	/* <----- End of ZPH */
+
 	rep = clientBuildReply(http, buf, size);
 	if (rep) {
 	    aclCheck_t *ch;