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Sourcecode: samba-doc-ja version File versions

srv_lsa_hnd.c

/* 
 *  Unix SMB/Netbios implementation.
 *  Version 1.9.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell              1992-1997,
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
 *  Copyright (C) Jeremy Allison                   2001.
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "includes.h"

/* This is the max handles across all instances of a pipe name. */
#ifndef MAX_OPEN_POLS
#define MAX_OPEN_POLS 1024
#endif

/****************************************************************************
 Hack as handles need to be persisant over lsa pipe closes so long as a samr
 pipe is open. JRA.
****************************************************************************/

static BOOL is_samr_lsa_pipe(const char *pipe_name)
{
      return (strstr(pipe_name, "samr") || strstr(pipe_name, "lsa"));
}

/****************************************************************************
 Initialise a policy handle list on a pipe. Handle list is shared between all
 pipes of the same name.
****************************************************************************/

BOOL init_pipe_handle_list(pipes_struct *p, char *pipe_name)
{
      pipes_struct *plist = get_first_pipe();
      struct handle_list *hl = NULL;

      for (plist = get_first_pipe(); plist; plist = get_next_pipe(plist)) {
            if (strequal( plist->name, pipe_name) ||
                  (is_samr_lsa_pipe(plist->name) && is_samr_lsa_pipe(pipe_name))) {
                  if (!plist->pipe_handles) {
                        pstring msg;
                        slprintf(msg, sizeof(msg)-1, "init_pipe_handles: NULL pipe_handle pointer in pipe %s",
                                    pipe_name );
                        smb_panic(msg);
                  }
                  hl = plist->pipe_handles;
                  break;
            }
      }

      if (!hl) {
            /*
             * No handle list for this pipe (first open of pipe).
             * Create list.
             */

            if ((hl = (struct handle_list *)malloc(sizeof(struct handle_list))) == NULL)
                  return False;
            ZERO_STRUCTP(hl);

            DEBUG(10,("init_pipe_handles: created handle list for pipe %s\n", pipe_name ));
      }

      /*
       * One more pipe is using this list.
       */

      hl->pipe_ref_count++;

      /*
       * Point this pipe at this list.
       */

      p->pipe_handles = hl;

      DEBUG(10,("init_pipe_handles: pipe_handles ref count = %u for pipe %s\n",
                  p->pipe_handles->pipe_ref_count, pipe_name ));

      return True;
}

/****************************************************************************
  find first available policy slot.  creates a policy handle for you.
****************************************************************************/

BOOL create_policy_hnd(pipes_struct *p, POLICY_HND *hnd, void (*free_fn)(void *), void *data_ptr)
{
      static uint32 pol_hnd_low  = 0;
      static uint32 pol_hnd_high = 0;

      struct policy *pol;

      if (p->pipe_handles->count > MAX_OPEN_POLS) {
            DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
                        (int)p->pipe_handles->count));
            return False;
      }

      pol = (struct policy *)malloc(sizeof(*p));
      if (!pol) {
            DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
            return False;
      }

      ZERO_STRUCTP(pol);

      pol->data_ptr = data_ptr;
      pol->free_fn = free_fn;

      pol_hnd_low++;
      if (pol_hnd_low == 0)
            (pol_hnd_high)++;

      SIVAL(&pol->pol_hnd.data1, 0 , 0);  /* first bit must be null */
      SIVAL(&pol->pol_hnd.data2, 0 , pol_hnd_low ); /* second bit is incrementing */
      SSVAL(&pol->pol_hnd.data3, 0 , pol_hnd_high); /* second bit is incrementing */
      SSVAL(&pol->pol_hnd.data4, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
      SIVAL(pol->pol_hnd.data5, 0, time(NULL)); /* something random */
      SIVAL(pol->pol_hnd.data5, 4, sys_getpid()); /* something more random */

      DLIST_ADD(p->pipe_handles->Policy, pol);
      p->pipe_handles->count++;

      *hnd = pol->pol_hnd;
      
      DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
      dump_data(4, (char *)hnd, sizeof(*hnd));

      return True;
}

/****************************************************************************
  find policy by handle - internal version.
****************************************************************************/

static struct policy *find_policy_by_hnd_internal(pipes_struct *p, POLICY_HND *hnd, void **data_p)
{
      struct policy *pol;
      size_t i;

      if (data_p)
            *data_p = NULL;

      for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
            if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
                  DEBUG(4,("Found policy hnd[%d] ", (int)i));
                  dump_data(4, (char *)hnd, sizeof(*hnd));
                  if (data_p)
                        *data_p = pol->data_ptr;
                  return pol;
            }
      }

      DEBUG(4,("Policy not found: "));
      dump_data(4, (char *)hnd, sizeof(*hnd));

      p->bad_handle_fault_state = True;
      return NULL;
}

/****************************************************************************
  find policy by handle
****************************************************************************/

BOOL find_policy_by_hnd(pipes_struct *p, POLICY_HND *hnd, void **data_p)
{
      return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
}

/****************************************************************************
  Close a policy.
****************************************************************************/

BOOL close_policy_hnd(pipes_struct *p, POLICY_HND *hnd)
{
      struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);

      if (!pol) {
            DEBUG(3,("Error closing policy\n"));
            return False;
      }

      DEBUG(3,("Closed policy\n"));

      if (pol->free_fn && pol->data_ptr)
            (*pol->free_fn)(pol->data_ptr);

      p->pipe_handles->count--;

      DLIST_REMOVE(p->pipe_handles->Policy, pol);

      ZERO_STRUCTP(pol);

      SAFE_FREE(pol);

      return True;
}

/****************************************************************************
 Close a pipe - free the handle list if it was the last pipe reference.
****************************************************************************/

void close_policy_by_pipe(pipes_struct *p)
{
      p->pipe_handles->pipe_ref_count--;

      if (p->pipe_handles->pipe_ref_count == 0) {
            /*
             * Last pipe open on this list - free the list.
             */
            while (p->pipe_handles->Policy)
                  close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);

            p->pipe_handles->Policy = NULL;
            p->pipe_handles->count = 0;

            SAFE_FREE(p->pipe_handles);
            p->pipe_handles = NULL;
            DEBUG(10,("close_policy_by_pipe: deleted handle list for pipe %s\n", p->name ));
      }
}

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