144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*
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* Copyright (C) 2008 Internet Systems Consortium, Inc. ("ISC")
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: portset.c,v 1.4 2008/06/24 23:24:35 marka Exp $ */
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/*! \file */
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#include <config.h>
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#include <isc/mem.h>
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#include <isc/portset.h>
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#include <isc/string.h>
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#include <isc/types.h>
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#include <isc/util.h>
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#define ISC_PORTSET_BUFSIZE (65536 / (sizeof(isc_uint32_t) * 8))
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/*%
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* Internal representation of portset. It's an array of 32-bit integers, each
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* bit corresponding to a single port in the ascending order. For example,
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* the second most significant bit of buf[0] corresponds to port 1.
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*/
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struct isc_portset {
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unsigned int nports; /*%< number of ports in the set */
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isc_uint32_t buf[ISC_PORTSET_BUFSIZE];
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};
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static inline isc_boolean_t
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portset_isset(isc_portset_t *portset, in_port_t port) {
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return (ISC_TF((portset->buf[port >> 5] & (1 << (port & 31))) != 0));
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}
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static inline void
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portset_add(isc_portset_t *portset, in_port_t port) {
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if (!portset_isset(portset, port)) {
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portset->nports++;
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portset->buf[port >> 5] |= (1 << (port & 31));
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}
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}
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static inline void
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portset_remove(isc_portset_t *portset, in_port_t port) {
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if (portset_isset(portset, port)) {
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portset->nports--;
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portset->buf[port >> 5] &= ~(1 << (port & 31));
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}
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}
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isc_result_t
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isc_portset_create(isc_mem_t *mctx, isc_portset_t **portsetp) {
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isc_portset_t *portset;
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REQUIRE(portsetp != NULL && *portsetp == NULL);
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portset = isc_mem_get(mctx, sizeof(*portset));
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if (portset == NULL)
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return (ISC_R_NOMEMORY);
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/* Make the set 'empty' by default */
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memset(portset, 0, sizeof(*portset));
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*portsetp = portset;
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return (ISC_R_SUCCESS);
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}
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void
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isc_portset_destroy(isc_mem_t *mctx, isc_portset_t **portsetp) {
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isc_portset_t *portset;
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REQUIRE(portsetp != NULL);
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portset = *portsetp;
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isc_mem_put(mctx, portset, sizeof(*portset));
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}
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isc_boolean_t
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isc_portset_isset(isc_portset_t *portset, in_port_t port) {
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REQUIRE(portset != NULL);
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return (portset_isset(portset, port));
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}
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unsigned int
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isc_portset_nports(isc_portset_t *portset) {
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REQUIRE(portset != NULL);
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return (portset->nports);
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}
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void
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isc_portset_add(isc_portset_t *portset, in_port_t port) {
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REQUIRE(portset != NULL);
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portset_add(portset, port);
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}
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void
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isc_portset_remove(isc_portset_t *portset, in_port_t port) {
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portset_remove(portset, port);
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}
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void
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isc_portset_addrange(isc_portset_t *portset, in_port_t port_lo,
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in_port_t port_hi)
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{
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in_port_t p;
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REQUIRE(portset != NULL);
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REQUIRE(port_lo <= port_hi);
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p = port_lo;
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do {
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portset_add(portset, p);
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} while (p++ < port_hi);
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}
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void
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isc_portset_removerange(isc_portset_t *portset, in_port_t port_lo,
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in_port_t port_hi)
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{
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in_port_t p;
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REQUIRE(portset != NULL);
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REQUIRE(port_lo <= port_hi);
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p = port_lo;
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do {
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portset_remove(portset, p);
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} while (p++ < port_hi);
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}
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