-/*
- * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file acl.c Access control lists for paraslash senders. */
/**
* Return true if addr_1 matches addr_2 in the first `netmask' bits.
*/
-static int v4_addr_match(uint32_t addr_1, uint32_t addr_2, uint8_t netmask)
+static bool v4_addr_match(uint32_t addr_1, uint32_t addr_2, uint8_t netmask)
{
uint32_t mask = ~0U;
+ if (netmask == 0) /* avoid 32-bit shift, which is undefined in C. */
+ return true;
if (netmask < 32)
mask <<= (32 - netmask);
return (htonl(addr_1) & mask) == (htonl(addr_2) & mask);