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