source/rpc_server/srv_lsa_hnd.c

   1 /*
   2  *  Unix SMB/Netbios implementation.
   3  *  Version 1.9.
   4  *  RPC Pipe client / server routines
   5  *  Copyright (C) Andrew Tridgell              1992-1997,
   6  *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
   7  *  Copyright (C) Jeremy Allison                           2001.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include "includes.h"
  25
  26 /* This is the max handles across all instances of a pipe name. */
  27 #ifndef MAX_OPEN_POLS
  28 #define MAX_OPEN_POLS 1024
  29 #endif
  30
  31 /****************************************************************************
  32  Initialise a policy handle list on a pipe. Handle list is shared between all
  33  pipes of the same name.
  34 ****************************************************************************/
  35
  36 BOOL init_pipe_handle_list(pipes_struct *p, char *pipe_name)
  37 {
  38         pipes_struct *plist = get_first_pipe();
  39         struct handle_list *hl = NULL;
  40
  41         for (plist = get_first_pipe(); plist; plist = get_next_pipe(plist)) {
  42                 if (strequal( plist->name, pipe_name)) {
  43                         if (!plist->pipe_handles) {
  44                                 pstring msg;
  45                                 slprintf(msg, sizeof(msg)-1, "init_pipe_handles: NULL pipe_handle pointer in pipe %s",
  46                                                 pipe_name );
  47                                 smb_panic(msg);
  48                         }
  49                         hl = plist->pipe_handles;
  50                         break;
  51                 }
  52         }
  53
  54         if (!hl) {
  55                 /*
  56                  * No handle list for this pipe (first open of pipe).
  57                  * Create list.
  58                  */
  59
  60                 if ((hl = (struct handle_list *)malloc(sizeof(struct handle_list))) == NULL)
  61                         return False;
  62                 ZERO_STRUCTP(hl);
  63
  64                 DEBUG(10,("init_pipe_handles: created handle list for pipe %s\n", pipe_name ));
  65         }
  66
  67         /*
  68          * One more pipe is using this list.
  69          */
  70
  71         hl->pipe_ref_count++;
  72
  73         /*
  74          * Point this pipe at this list.
  75          */
  76
  77         p->pipe_handles = hl;
  78
  79         DEBUG(10,("init_pipe_handles: pipe_handles ref count = %u for pipe %s\n",
  80                         p->pipe_handles->pipe_ref_count, pipe_name ));
  81
  82         return True;
  83 }
  84
  85 /****************************************************************************
  86   find first available policy slot.  creates a policy handle for you.
  87 ****************************************************************************/
  88
  89 BOOL create_policy_hnd(pipes_struct *p, POLICY_HND *hnd, void (*free_fn)(void *), void *data_ptr)
  90 {
  91         static uint32 pol_hnd_low  = 0;
  92         static uint32 pol_hnd_high = 0;
  93
  94         struct policy *pol;
  95
  96         if (p->pipe_handles->count > MAX_OPEN_POLS) {
  97                 DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
  98                                 (int)p->pipe_handles->count));
  99                 return False;
 100         }
 101
 102         pol = (struct policy *)malloc(sizeof(*p));
 103         if (!pol) {
 104                 DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
 105                 return False;
 106         }
 107
 108         ZERO_STRUCTP(pol);
 109
 110         pol->data_ptr = data_ptr;
 111         pol->free_fn = free_fn;
 112
 113     pol_hnd_low++;
 114     if (pol_hnd_low == 0) (pol_hnd_high)++;
 115
 116     SIVAL(&pol->pol_hnd.data1, 0 , 0);  /* first bit must be null */
 117     SIVAL(&pol->pol_hnd.data2, 0 , pol_hnd_low ); /* second bit is incrementing */
 118     SSVAL(&pol->pol_hnd.data3, 0 , pol_hnd_high); /* second bit is incrementing */
 119     SSVAL(&pol->pol_hnd.data4, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
 120     SIVAL(pol->pol_hnd.data5, 0, time(NULL)); /* something random */
 121     SIVAL(pol->pol_hnd.data5, 4, sys_getpid()); /* something more random */
 122
 123         DLIST_ADD(p->pipe_handles->Policy, pol);
 124         p->pipe_handles->count++;
 125
 126         *hnd = pol->pol_hnd;
 127
 128         DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
 129         dump_data(4, (char *)hnd, sizeof(*hnd));
 130
 131         return True;
 132 }
 133
 134 /****************************************************************************
 135   find policy by handle - internal version.
 136 ****************************************************************************/
 137
 138 static struct policy *find_policy_by_hnd_internal(pipes_struct *p, POLICY_HND *hnd, void **data_p)
 139 {
 140         struct policy *pol;
 141         size_t i;
 142
 143         if (data_p)
 144                 *data_p = NULL;
 145
 146         for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
 147                 if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
 148                         DEBUG(4,("Found policy hnd[%d] ", (int)i));
 149                         dump_data(4, (char *)hnd, sizeof(*hnd));
 150                         if (data_p)
 151                                 *data_p = pol->data_ptr;
 152                         return pol;
 153                 }
 154         }
 155
 156         DEBUG(4,("Policy not found: "));
 157         dump_data(4, (char *)hnd, sizeof(*hnd));
 158
 159         return NULL;
 160 }
 161
 162 /****************************************************************************
 163   find policy by handle
 164 ****************************************************************************/
 165
 166 BOOL find_policy_by_hnd(pipes_struct *p, POLICY_HND *hnd, void **data_p)
 167 {
 168         return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
 169 }
 170
 171 /****************************************************************************
 172   Close a policy.
 173 ****************************************************************************/
 174
 175 BOOL close_policy_hnd(pipes_struct *p, POLICY_HND *hnd)
 176 {
 177         struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);
 178
 179         if (!pol) {
 180                 DEBUG(3,("Error closing policy\n"));
 181                 return False;
 182         }
 183
 184         DEBUG(3,("Closed policy\n"));
 185
 186         if (pol->free_fn && pol->data_ptr)
 187                 (*pol->free_fn)(pol->data_ptr);
 188
 189         p->pipe_handles->count--;
 190
 191         DLIST_REMOVE(p->pipe_handles->Policy, pol);
 192
 193         ZERO_STRUCTP(pol);
 194
 195         SAFE_FREE(pol);
 196
 197         return True;
 198 }
 199
 200 /****************************************************************************
 201  Close a pipe - free the handle list if it was the last pipe reference.
 202 ****************************************************************************/
 203
 204 void close_policy_by_pipe(pipes_struct *p)
 205 {
 206         p->pipe_handles->pipe_ref_count--;
 207
 208         if (p->pipe_handles->pipe_ref_count == 0) {
 209                 /*
 210                  * Last pipe open on this list - free the list.
 211                  */
 212                 while (p->pipe_handles->Policy)
 213                         close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);
 214
 215                 p->pipe_handles->Policy = NULL;
 216                 p->pipe_handles->count = 0;
 217
 218                 SAFE_FREE(p->pipe_handles);
 219                 DEBUG(10,("close_policy_by_pipe: deleted handle list for pipe %s\n", p->name ));
 220         }
 221 }