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/*
* Copyright (C) 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: portlist.c,v 1.3 2019/12/17 01:46:32 sthen Exp $ */
/*! \file */
#include <config.h>
#include <stdlib.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/mutex.h>
#include <isc/net.h>
#include <isc/refcount.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/util.h>
#include <dns/types.h>
#include <dns/portlist.h>
#define DNS_PORTLIST_MAGIC ISC_MAGIC('P','L','S','T')
#define DNS_VALID_PORTLIST(p) ISC_MAGIC_VALID(p, DNS_PORTLIST_MAGIC)
typedef struct dns_element {
in_port_t port;
isc_uint16_t flags;
} dns_element_t;
struct dns_portlist {
unsigned int magic;
isc_mem_t *mctx;
isc_refcount_t refcount;
isc_mutex_t lock;
dns_element_t *list;
unsigned int allocated;
unsigned int active;
};
#define DNS_PL_INET 0x0001
#define DNS_PL_INET6 0x0002
#define DNS_PL_ALLOCATE 16
static int
compare(const void *arg1, const void *arg2) {
const dns_element_t *e1 = (const dns_element_t *)arg1;
const dns_element_t *e2 = (const dns_element_t *)arg2;
if (e1->port < e2->port)
return (-1);
if (e1->port > e2->port)
return (1);
return (0);
}
isc_result_t
dns_portlist_create(isc_mem_t *mctx, dns_portlist_t **portlistp) {
dns_portlist_t *portlist;
isc_result_t result;
REQUIRE(portlistp != NULL && *portlistp == NULL);
portlist = isc_mem_get(mctx, sizeof(*portlist));
if (portlist == NULL)
return (ISC_R_NOMEMORY);
result = isc_mutex_init(&portlist->lock);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, portlist, sizeof(*portlist));
return (result);
}
result = isc_refcount_init(&portlist->refcount, 1);
if (result != ISC_R_SUCCESS) {
DESTROYLOCK(&portlist->lock);
isc_mem_put(mctx, portlist, sizeof(*portlist));
return (result);
}
portlist->list = NULL;
portlist->allocated = 0;
portlist->active = 0;
portlist->mctx = NULL;
isc_mem_attach(mctx, &portlist->mctx);
portlist->magic = DNS_PORTLIST_MAGIC;
*portlistp = portlist;
return (ISC_R_SUCCESS);
}
static dns_element_t *
find_port(dns_element_t *list, unsigned int len, in_port_t port) {
unsigned int xtry = len / 2;
unsigned int min = 0;
unsigned int max = len - 1;
unsigned int last = len;
for (;;) {
if (list[xtry].port == port)
return (&list[xtry]);
if (port > list[xtry].port) {
if (xtry == max)
break;
min = xtry;
xtry = xtry + (max - xtry + 1) / 2;
INSIST(xtry <= max);
if (xtry == last)
break;
last = min;
} else {
if (xtry == min)
break;
max = xtry;
xtry = xtry - (xtry - min + 1) / 2;
INSIST(xtry >= min);
if (xtry == last)
break;
last = max;
}
}
return (NULL);
}
isc_result_t
dns_portlist_add(dns_portlist_t *portlist, int af, in_port_t port) {
dns_element_t *el;
isc_result_t result;
REQUIRE(DNS_VALID_PORTLIST(portlist));
REQUIRE(af == AF_INET || af == AF_INET6);
LOCK(&portlist->lock);
if (portlist->active != 0) {
el = find_port(portlist->list, portlist->active, port);
if (el != NULL) {
if (af == AF_INET)
el->flags |= DNS_PL_INET;
else
el->flags |= DNS_PL_INET6;
result = ISC_R_SUCCESS;
goto unlock;
}
}
if (portlist->allocated <= portlist->active) {
unsigned int allocated;
allocated = portlist->allocated + DNS_PL_ALLOCATE;
el = isc_mem_get(portlist->mctx, sizeof(*el) * allocated);
if (el == NULL) {
result = ISC_R_NOMEMORY;
goto unlock;
}
if (portlist->list != NULL) {
memmove(el, portlist->list,
portlist->allocated * sizeof(*el));
isc_mem_put(portlist->mctx, portlist->list,
portlist->allocated * sizeof(*el));
}
portlist->list = el;
portlist->allocated = allocated;
}
portlist->list[portlist->active].port = port;
if (af == AF_INET)
portlist->list[portlist->active].flags = DNS_PL_INET;
else
portlist->list[portlist->active].flags = DNS_PL_INET6;
portlist->active++;
qsort(portlist->list, portlist->active, sizeof(*el), compare);
result = ISC_R_SUCCESS;
unlock:
UNLOCK(&portlist->lock);
return (result);
}
void
dns_portlist_remove(dns_portlist_t *portlist, int af, in_port_t port) {
dns_element_t *el;
REQUIRE(DNS_VALID_PORTLIST(portlist));
REQUIRE(af == AF_INET || af == AF_INET6);
LOCK(&portlist->lock);
if (portlist->active != 0) {
el = find_port(portlist->list, portlist->active, port);
if (el != NULL) {
if (af == AF_INET)
el->flags &= ~DNS_PL_INET;
else
el->flags &= ~DNS_PL_INET6;
if (el->flags == 0) {
*el = portlist->list[portlist->active];
portlist->active--;
qsort(portlist->list, portlist->active,
sizeof(*el), compare);
}
}
}
UNLOCK(&portlist->lock);
}
isc_boolean_t
dns_portlist_match(dns_portlist_t *portlist, int af, in_port_t port) {
dns_element_t *el;
isc_boolean_t result = ISC_FALSE;
REQUIRE(DNS_VALID_PORTLIST(portlist));
REQUIRE(af == AF_INET || af == AF_INET6);
LOCK(&portlist->lock);
if (portlist->active != 0) {
el = find_port(portlist->list, portlist->active, port);
if (el != NULL) {
if (af == AF_INET && (el->flags & DNS_PL_INET) != 0)
result = ISC_TRUE;
if (af == AF_INET6 && (el->flags & DNS_PL_INET6) != 0)
result = ISC_TRUE;
}
}
UNLOCK(&portlist->lock);
return (result);
}
void
dns_portlist_attach(dns_portlist_t *portlist, dns_portlist_t **portlistp) {
REQUIRE(DNS_VALID_PORTLIST(portlist));
REQUIRE(portlistp != NULL && *portlistp == NULL);
isc_refcount_increment(&portlist->refcount, NULL);
*portlistp = portlist;
}
void
dns_portlist_detach(dns_portlist_t **portlistp) {
dns_portlist_t *portlist;
unsigned int count;
REQUIRE(portlistp != NULL);
portlist = *portlistp;
REQUIRE(DNS_VALID_PORTLIST(portlist));
*portlistp = NULL;
isc_refcount_decrement(&portlist->refcount, &count);
if (count == 0) {
portlist->magic = 0;
isc_refcount_destroy(&portlist->refcount);
if (portlist->list != NULL)
isc_mem_put(portlist->mctx, portlist->list,
portlist->allocated *
sizeof(*portlist->list));
DESTROYLOCK(&portlist->lock);
isc_mem_putanddetach(&portlist->mctx, portlist,
sizeof(*portlist));
}
}
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