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 extern int DEBUGLEVEL;
  27
  28 /* This is the max handles across all instances of a pipe name. */
  29 #ifndef MAX_OPEN_POLS
  30 #define MAX_OPEN_POLS 1024
  31 #endif
  32
  33 /****************************************************************************
  34  Initialise a policy handle list on a pipe. Handle list is shared between all
  35  pipes of the same name.
  36 ****************************************************************************/
  37
  38 BOOL init_pipe_handle_list(pipes_struct *p, char *pipe_name)
  39 {
  40         pipes_struct *plist = get_first_pipe();
  41         struct handle_list *hl = NULL;
  42
  43         for (plist = get_first_pipe(); plist; plist = get_next_pipe(plist)) {
  44                 if (strequal( plist->name, pipe_name)) {
  45                         if (!plist->pipe_handles) {
  46                                 pstring msg;
  47                                 slprintf(msg, sizeof(msg)-1, "init_pipe_handles: NULL pipe_handle pointer in pipe %s",
  48                                                 pipe_name );
  49                                 smb_panic(msg);
  50                         }
  51                         hl = plist->pipe_handles;
  52                         break;
  53                 }
  54         }
  55
  56         if (!hl) {
  57                 /*
  58                  * No handle list for this pipe (first open of pipe).
  59                  * Create list.
  60                  */
  61
  62                 if ((hl = (struct handle_list *)malloc(sizeof(struct handle_list))) == NULL)
  63                         return False;
  64                 ZERO_STRUCTP(hl);
  65
  66                 DEBUG(10,("init_pipe_handles: created handle list for pipe %s\n", pipe_name ));
  67         }
  68
  69         /*
  70          * One more pipe is using this list.
  71          */
  72
  73         hl->pipe_ref_count++;
  74
  75         /*
  76          * Point this pipe at this list.
  77          */
  78
  79         p->pipe_handles = hl;
  80
  81         DEBUG(10,("init_pipe_handles: pipe_handles ref count = %u for pipe %s\n",
  82                         p->pipe_handles->pipe_ref_count, pipe_name ));
  83
  84         return True;
  85 }
  86
  87 /****************************************************************************
  88   find first available policy slot.  creates a policy handle for you.
  89 ****************************************************************************/
  90
  91 BOOL create_policy_hnd(pipes_struct *p, POLICY_HND *hnd, void (*free_fn)(void *), void *data_ptr)
  92 {
  93         static uint32 pol_hnd_low  = 0;
  94         static uint32 pol_hnd_high = 0;
  95
  96         struct policy *pol;
  97
  98         if (p->pipe_handles->count > MAX_OPEN_POLS) {
  99                 DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
 100                                 (int)p->pipe_handles->count));
 101                 return False;
 102         }
 103
 104         pol = (struct policy *)malloc(sizeof(*p));
 105         if (!pol) {
 106                 DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
 107                 return False;
 108         }
 109
 110         ZERO_STRUCTP(pol);
 111
 112         pol->p = p;
 113         pol->data_ptr = data_ptr;
 114         pol->free_fn = free_fn;
 115
 116     pol_hnd_low++;
 117     if (pol_hnd_low == 0) (pol_hnd_high)++;
 118
 119     SIVAL(&pol->pol_hnd.data1, 0 , 0);  /* first bit must be null */
 120     SIVAL(&pol->pol_hnd.data2, 0 , pol_hnd_low ); /* second bit is incrementing */
 121     SSVAL(&pol->pol_hnd.data3, 0 , pol_hnd_high); /* second bit is incrementing */
 122     SSVAL(&pol->pol_hnd.data4, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
 123     SIVAL(pol->pol_hnd.data5, 0, time(NULL)); /* something random */
 124     SIVAL(pol->pol_hnd.data5, 4, sys_getpid()); /* something more random */
 125
 126         DLIST_ADD(p->pipe_handles->Policy, pol);
 127         p->pipe_handles->count++;
 128
 129         *hnd = pol->pol_hnd;
 130
 131         DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
 132         dump_data(4, (char *)hnd, sizeof(*hnd));
 133
 134         return True;
 135 }
 136
 137 /****************************************************************************
 138   find policy by handle - internal version.
 139 ****************************************************************************/
 140
 141 static struct policy *find_policy_by_hnd_internal(pipes_struct *p, POLICY_HND *hnd, void **data_p)
 142 {
 143         struct policy *pol;
 144         size_t i;
 145
 146         if (data_p)
 147                 *data_p = NULL;
 148
 149         for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
 150                 if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
 151                         DEBUG(4,("Found policy hnd[%d] ", (int)i));
 152                         dump_data(4, (char *)hnd, sizeof(*hnd));
 153                         if (data_p)
 154                                 *data_p = pol->data_ptr;
 155                         return pol;
 156                 }
 157         }
 158
 159         DEBUG(4,("Policy not found: "));
 160         dump_data(4, (char *)hnd, sizeof(*hnd));
 161
 162         return NULL;
 163 }
 164
 165 /****************************************************************************
 166   find policy by handle
 167 ****************************************************************************/
 168
 169 BOOL find_policy_by_hnd(pipes_struct *p, POLICY_HND *hnd, void **data_p)
 170 {
 171         return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
 172 }
 173
 174 /****************************************************************************
 175   Close a policy.
 176 ****************************************************************************/
 177
 178 BOOL close_policy_hnd(pipes_struct *p, POLICY_HND *hnd)
 179 {
 180         struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);
 181
 182         if (!pol) {
 183                 DEBUG(3,("Error closing policy\n"));
 184                 return False;
 185         }
 186
 187         DEBUG(3,("Closed policy\n"));
 188
 189         if (pol->free_fn && pol->data_ptr)
 190                 (*pol->free_fn)(pol->data_ptr);
 191
 192         pol->p->pipe_handles->count--;
 193
 194         DLIST_REMOVE(pol->p->pipe_handles->Policy, pol);
 195
 196         ZERO_STRUCTP(pol);
 197
 198         free(pol);
 199
 200         return True;
 201 }
 202
 203 /****************************************************************************
 204  Close a pipe - free the handle list if it was the last pipe reference.
 205 ****************************************************************************/
 206
 207 void close_policy_by_pipe(pipes_struct *p)
 208 {
 209         p->pipe_handles->pipe_ref_count--;
 210
 211         if (p->pipe_handles->pipe_ref_count == 0) {
 212                 /*
 213                  * Last pipe open on this list - free the list.
 214                  */
 215                 while (p->pipe_handles->Policy)
 216                         close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);
 217
 218                 p->pipe_handles->Policy = NULL;
 219                 p->pipe_handles->count = 0;
 220
 221                 free(p->pipe_handles);
 222                 p->pipe_handles = NULL;
 223                 DEBUG(10,("close_policy_by_pipe: deleted handle list for pipe %s\n", p->name ));
 224         }
 225 }