contrib/bind-9.5.2/lib/isc/portset.c

   1 /*
   2  * Copyright (C) 2008  Internet Systems Consortium, Inc. ("ISC")
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
   9  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  10  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  11  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  12  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  13  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  14  * PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 /* $Id: portset.c,v 1.2.2.3 2008/06/24 23:26:49 marka Exp $ */
  18
  19 /*! \file */
  20
  21 #include <config.h>
  22
  23 #include <isc/mem.h>
  24 #include <isc/portset.h>
  25 #include <isc/string.h>
  26 #include <isc/types.h>
  27 #include <isc/util.h>
  28
  29 #define ISC_PORTSET_BUFSIZE (65536 / (sizeof(isc_uint32_t) * 8))
  30
  31 /*%
  32  * Internal representation of portset.  It's an array of 32-bit integers, each
  33  * bit corresponding to a single port in the ascending order.  For example,
  34  * the second most significant bit of buf[0] corresponds to port 1.
  35  */
  36 struct isc_portset {
  37         unsigned int nports;    /*%< number of ports in the set */
  38         isc_uint32_t buf[ISC_PORTSET_BUFSIZE];
  39 };
  40
  41 static inline isc_boolean_t
  42 portset_isset(isc_portset_t *portset, in_port_t port) {
  43         return (ISC_TF((portset->buf[port >> 5] & (1 << (port & 31))) != 0));
  44 }
  45
  46 static inline void
  47 portset_add(isc_portset_t *portset, in_port_t port) {
  48         if (!portset_isset(portset, port)) {
  49                 portset->nports++;
  50                 portset->buf[port >> 5] |= (1 << (port & 31));
  51         }
  52 }
  53
  54 static inline void
  55 portset_remove(isc_portset_t *portset, in_port_t port) {
  56         if (portset_isset(portset, port)) {
  57                 portset->nports--;
  58                 portset->buf[port >> 5] &= ~(1 << (port & 31));
  59         }
  60 }
  61
  62 isc_result_t
  63 isc_portset_create(isc_mem_t *mctx, isc_portset_t **portsetp) {
  64         isc_portset_t *portset;
  65
  66         REQUIRE(portsetp != NULL && *portsetp == NULL);
  67
  68         portset = isc_mem_get(mctx, sizeof(*portset));
  69         if (portset == NULL)
  70                 return (ISC_R_NOMEMORY);
  71
  72         /* Make the set 'empty' by default */
  73         memset(portset, 0, sizeof(*portset));
  74         *portsetp = portset;
  75
  76         return (ISC_R_SUCCESS);
  77 }
  78
  79 void
  80 isc_portset_destroy(isc_mem_t *mctx, isc_portset_t **portsetp) {
  81         isc_portset_t *portset;
  82
  83         REQUIRE(portsetp != NULL);
  84         portset = *portsetp;
  85
  86         isc_mem_put(mctx, portset, sizeof(*portset));
  87 }
  88
  89 isc_boolean_t
  90 isc_portset_isset(isc_portset_t *portset, in_port_t port) {
  91         REQUIRE(portset != NULL);
  92
  93         return (portset_isset(portset, port));
  94 }
  95
  96 unsigned int
  97 isc_portset_nports(isc_portset_t *portset) {
  98         REQUIRE(portset != NULL);
  99
 100         return (portset->nports);
 101 }
 102
 103 void
 104 isc_portset_add(isc_portset_t *portset, in_port_t port) {
 105         REQUIRE(portset != NULL);
 106
 107         portset_add(portset, port);
 108 }
 109
 110 void
 111 isc_portset_remove(isc_portset_t *portset, in_port_t port) {
 112         portset_remove(portset, port);
 113 }
 114
 115 void
 116 isc_portset_addrange(isc_portset_t *portset, in_port_t port_lo,
 117                      in_port_t port_hi)
 118 {
 119         in_port_t p;
 120
 121         REQUIRE(portset != NULL);
 122         REQUIRE(port_lo <= port_hi);
 123
 124         p = port_lo;
 125         do {
 126                 portset_add(portset, p);
 127         } while (p++ < port_hi);
 128 }
 129
 130 void
 131 isc_portset_removerange(isc_portset_t *portset, in_port_t port_lo,
 132                         in_port_t port_hi)
 133 {
 134         in_port_t p;
 135
 136         REQUIRE(portset != NULL);
 137         REQUIRE(port_lo <= port_hi);
 138
 139         p = port_lo;
 140         do {
 141                 portset_remove(portset, p);
 142         } while (p++ < port_hi);
 143 }