source: branches/samba-3.2.x/source/smbd/fake_file.c

/* 
   Unix SMB/CIFS implementation.
   FAKE FILE suppport, for faking up special files windows want access to
   Copyright (C) Stefan (metze) Metzmacher      2003
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

extern struct current_user current_user;

static FAKE_FILE fake_files[] = {
#ifdef WITH_QUOTAS
        {FAKE_FILE_NAME_QUOTA_UNIX,     FAKE_FILE_TYPE_QUOTA,   init_quota_handle,      destroy_quota_handle},
#endif /* WITH_QUOTAS */
        {NULL,                          FAKE_FILE_TYPE_NONE,    NULL,                   NULL }
};

/****************************************************************************
 Create a fake file handle
****************************************************************************/

static struct _FAKE_FILE_HANDLE *init_fake_file_handle(enum FAKE_FILE_TYPE type)
{
        TALLOC_CTX *mem_ctx = NULL;
        FAKE_FILE_HANDLE *fh = NULL;
        int i;

        for (i=0;fake_files[i].name!=NULL;i++) {
                if (fake_files[i].type==type) {
                        DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));

                        if ((mem_ctx=talloc_init("fake_file_handle"))==NULL) {
                                DEBUG(0,("talloc_init(fake_file_handle) failed.\n"));
                                return NULL;    
                        }

                        if ((fh =TALLOC_ZERO_P(mem_ctx, FAKE_FILE_HANDLE))==NULL) {
                                DEBUG(0,("TALLOC_ZERO() failed.\n"));
                                talloc_destroy(mem_ctx);
                                return NULL;
                        }

                        fh->type = type;
                        fh->mem_ctx = mem_ctx;

                        if (fake_files[i].init_pd) {
                                fh->pd = fake_files[i].init_pd(fh->mem_ctx);
                        }

                        fh->free_pd = fake_files[i].free_pd;

                        return fh;
                }
        }

        return NULL;    
}

/****************************************************************************
 Does this name match a fake filename ?
****************************************************************************/

enum FAKE_FILE_TYPE is_fake_file(const char *fname)
{
#ifdef HAVE_SYS_QUOTAS
        int i;
#endif

        if (!fname) {
                return FAKE_FILE_TYPE_NONE;
        }

#ifdef HAVE_SYS_QUOTAS
        for (i=0;fake_files[i].name!=NULL;i++) {
                if (strncmp(fname,fake_files[i].name,strlen(fake_files[i].name))==0) {
                        DEBUG(5,("is_fake_file: [%s] is a fake file\n",fname));
                        return fake_files[i].type;
                }
        }
#endif

        return FAKE_FILE_TYPE_NONE;
}


/****************************************************************************
 Open a fake quota file with a share mode.
****************************************************************************/

NTSTATUS open_fake_file(connection_struct *conn,
                                enum FAKE_FILE_TYPE fake_file_type,
                                const char *fname,
                                uint32 access_mask,
                                files_struct **result)
{
        files_struct *fsp = NULL;
        NTSTATUS status;

        /* access check */
        if (current_user.ut.uid != 0) {
                DEBUG(3, ("open_fake_file_shared: access_denied to "
                          "service[%s] file[%s] user[%s]\n",
                          lp_servicename(SNUM(conn)),fname,conn->user));
                return NT_STATUS_ACCESS_DENIED;

        }

        status = file_new(conn, &fsp);
        if(!NT_STATUS_IS_OK(status)) {
                return status;
        }

        DEBUG(5,("open_fake_file_shared: fname = %s, FID = %d, access_mask = 0x%x\n",
                fname, fsp->fnum, (unsigned int)access_mask));

        fsp->conn = conn;
        fsp->fh->fd = -1;
        fsp->vuid = current_user.vuid;
        fsp->fh->pos = -1;
        fsp->can_lock = False; /* Should this be true ? - No, JRA */
        fsp->access_mask = access_mask;
        string_set(&fsp->fsp_name,fname);
        
        fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
        
        if (fsp->fake_file_handle==NULL) {
                file_free(fsp);
                return NT_STATUS_NO_MEMORY;
        }

        *result = fsp;
        return NT_STATUS_OK;
}

void destroy_fake_file_handle(FAKE_FILE_HANDLE **fh)
{
        if (!fh||!(*fh)) {
                return;
        }

        if ((*fh)->free_pd) {
                (*fh)->free_pd(&(*fh)->pd);             
        }

        talloc_destroy((*fh)->mem_ctx);
        (*fh) = NULL;
}

NTSTATUS close_fake_file(files_struct *fsp)
{
        file_free(fsp);
        return NT_STATUS_OK;
}