contrib/dhcp-3.0/server/salloc.c

   1 /* salloc.c
   2
   3    Memory allocation for the DHCP server... */
   4
   5 /*
   6  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 1996-2003 by Internet Software Consortium
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  19  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  *   Internet Systems Consortium, Inc.
  22  *   950 Charter Street
  23  *   Redwood City, CA 94063
  24  *   <info@isc.org>
  25  *   http://www.isc.org/
  26  *
  27  * This software has been written for Internet Systems Consortium
  28  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
  29  * To learn more about Internet Systems Consortium, see
  30  * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
  31  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
  32  * ``http://www.nominum.com''.
  33  */
  34
  35 #ifndef lint
  36 static char copyright[] =
  37 "$Id: salloc.c,v 1.2.2.5 2004/06/10 17:59:57 dhankins Exp $ Copyright (c) 2004 Internet Systems Consortium.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #include "dhcpd.h"
  41 #include <omapip/omapip_p.h>
  42
  43 #if defined (COMPACT_LEASES)
  44 struct lease *free_leases;
  45
  46 # if defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
  47 struct lease *lease_hunks;
  48
  49 void relinquish_lease_hunks ()
  50 {
  51         struct lease *c, *n, **p, *f;
  52         int i;
  53
  54         /* Account for all the leases on the free list. */
  55         for (n = lease_hunks; n; n = n -> next) {
  56             for (i = 1; i < n -> starts + 1; i++) {
  57                 p = &free_leases;
  58                 for (c = free_leases; c; c = c -> next) {
  59                     if (c == &n [i]) {
  60                         *p = c -> next;
  61                         n -> ends++;
  62                         break;
  63                     }
  64                     p = &c -> next;
  65                 }
  66                 if (!c) {
  67                     log_info ("lease %s refcnt %d",
  68                               piaddr (n [i].ip_addr), n [i].refcnt);
  69                     dump_rc_history (&n [i]);
  70                 }
  71             }
  72         }
  73
  74         for (c = lease_hunks; c; c = n) {
  75                 n = c -> next;
  76                 if (c -> ends != c -> starts) {
  77                         log_info ("lease hunk %lx leases %ld free %ld",
  78                                   (unsigned long)c, (unsigned long)c -> starts,
  79                                   (unsigned long)c -> ends);
  80                 }
  81                 dfree (c, MDL);
  82         }
  83
  84         /* Free all the rogue leases. */
  85         for (c = free_leases; c; c = n) {
  86                 n = c -> next;
  87                 dfree (c, MDL);
  88         }
  89 }
  90 #endif
  91
  92 struct lease *new_leases (n, file, line)
  93         unsigned n;
  94         const char *file;
  95         int line;
  96 {
  97         struct lease *rval;
  98 #if defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
  99         rval = dmalloc ((n + 1) * sizeof (struct lease), file, line);
 100         memset (rval, 0, sizeof (struct lease));
 101         rval -> starts = n;
 102         rval -> next = lease_hunks;
 103         lease_hunks = rval;
 104         rval++;
 105 #else
 106         rval = dmalloc (n * sizeof (struct lease), file, line);
 107 #endif
 108         return rval;
 109 }
 110
 111 /* If we are allocating leases in aggregations, there's really no way
 112    to free one, although perhaps we can maintain a free list. */
 113
 114 isc_result_t dhcp_lease_free (omapi_object_t *lo,
 115                               const char *file, int line)
 116 {
 117         struct lease *lease;
 118         if (lo -> type != dhcp_type_lease)
 119                 return ISC_R_INVALIDARG;
 120         lease = (struct lease *)lo;
 121         memset (lease, 0, sizeof (struct lease));
 122         lease -> next = free_leases;
 123         free_leases = lease;
 124         return ISC_R_SUCCESS;
 125 }
 126
 127 isc_result_t dhcp_lease_get (omapi_object_t **lp,
 128                              const char *file, int line)
 129 {
 130         struct lease **lease = (struct lease **)lp;
 131         struct lease *lt;
 132
 133         if (free_leases) {
 134                 lt = free_leases;
 135                 free_leases = lt -> next;
 136                 *lease = lt;
 137                 return ISC_R_SUCCESS;
 138         }
 139         return ISC_R_NOMEMORY;
 140 }
 141 #endif /* COMPACT_LEASES */
 142
 143 OMAPI_OBJECT_ALLOC (lease, struct lease, dhcp_type_lease)
 144 OMAPI_OBJECT_ALLOC (class, struct class, dhcp_type_class)
 145 OMAPI_OBJECT_ALLOC (pool, struct pool, dhcp_type_pool)
 146
 147 #if !defined (NO_HOST_FREES)    /* Scary debugging mode - don't enable! */
 148 OMAPI_OBJECT_ALLOC (host, struct host_decl, dhcp_type_host)
 149 #else
 150 isc_result_t host_allocate (struct host_decl **p, const char *file, int line)
 151 {
 152         return omapi_object_allocate ((omapi_object_t **)p,
 153                                       dhcp_type_host, 0, file, line);
 154 }
 155
 156 isc_result_t host_reference (struct host_decl **pptr, struct host_decl *ptr,
 157                                const char *file, int line)
 158 {
 159         return omapi_object_reference ((omapi_object_t **)pptr,
 160                                        (omapi_object_t *)ptr, file, line);
 161 }
 162
 163 isc_result_t host_dereference (struct host_decl **ptr,
 164                                const char *file, int line)
 165 {
 166         if ((*ptr) -> refcnt == 1) {
 167                 log_error ("host dereferenced with refcnt == 1.");
 168 #if defined (DEBUG_RC_HISTORY)
 169                 dump_rc_history ();
 170 #endif
 171                 abort ();
 172         }
 173         return omapi_object_dereference ((omapi_object_t **)ptr, file, line);
 174 }
 175 #endif
 176
 177 struct lease_state *free_lease_states;
 178
 179 struct lease_state *new_lease_state (file, line)
 180         const char *file;
 181         int line;
 182 {
 183         struct lease_state *rval;
 184
 185         if (free_lease_states) {
 186                 rval = free_lease_states;
 187                 free_lease_states =
 188                         (struct lease_state *)(free_lease_states -> next);
 189                 dmalloc_reuse (rval, file, line, 0);
 190         } else {
 191                 rval = dmalloc (sizeof (struct lease_state), file, line);
 192                 if (!rval)
 193                         return rval;
 194         }
 195         memset (rval, 0, sizeof *rval);
 196         if (!option_state_allocate (&rval -> options, file, line)) {
 197                 free_lease_state (rval, file, line);
 198                 return (struct lease_state *)0;
 199         }
 200         return rval;
 201 }
 202
 203 void free_lease_state (ptr, file, line)
 204         struct lease_state *ptr;
 205         const char *file;
 206         int line;
 207 {
 208         if (ptr -> options)
 209                 option_state_dereference (&ptr -> options, file, line);
 210         if (ptr -> packet)
 211                 packet_dereference (&ptr -> packet, file, line);
 212         if (ptr -> shared_network)
 213                 shared_network_dereference (&ptr -> shared_network,
 214                                             file, line);
 215
 216         data_string_forget (&ptr -> parameter_request_list, file, line);
 217         data_string_forget (&ptr -> filename, file, line);
 218         data_string_forget (&ptr -> server_name, file, line);
 219         ptr -> next = free_lease_states;
 220         free_lease_states = ptr;
 221         dmalloc_reuse (free_lease_states, (char *)0, 0, 0);
 222 }
 223
 224 #if defined (DEBUG_MEMORY_LEAKAGE) || \
 225                 defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
 226 void relinquish_free_lease_states ()
 227 {
 228         struct lease_state *cs, *ns;
 229
 230         for (cs = free_lease_states; cs; cs = ns) {
 231                 ns = cs -> next;
 232                 dfree (cs, MDL);
 233         }
 234         free_lease_states = (struct lease_state *)0;
 235 }
 236 #endif
 237
 238 struct permit *new_permit (file, line)
 239         const char *file;
 240         int line;
 241 {
 242         struct permit *permit = ((struct permit *)
 243                                  dmalloc (sizeof (struct permit), file, line));
 244         if (!permit)
 245                 return permit;
 246         memset (permit, 0, sizeof *permit);
 247         return permit;
 248 }
 249
 250 void free_permit (permit, file, line)
 251         struct permit *permit;
 252         const char *file;
 253         int line;
 254 {
 255         if (permit -> type == permit_class)
 256                 class_dereference (&permit -> class, MDL);
 257         dfree (permit, file, line);
 258 }