source: trunk/server/source3/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"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "fake_file.h"
#include "auth.h"

struct fake_file_type {
        const char *name;
        enum FAKE_FILE_TYPE type;
        void *(*init_pd)(TALLOC_CTX *mem_ctx);
};

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

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

static struct fake_file_handle *init_fake_file_handle(enum FAKE_FILE_TYPE type)
{
        struct fake_file_handle *fh = NULL;
        int i;

        for (i=0; fake_files[i].name!=NULL; i++) {
                if (fake_files[i].type==type) {
                        break;
                }
        }

        if (fake_files[i].name == NULL) {
                return NULL;
        }

        DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));

        fh = talloc(NULL, struct fake_file_handle);
        if (fh == NULL) {
                DEBUG(0,("TALLOC_ZERO() failed.\n"));
                return NULL;
        }

        fh->type = type;

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

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

enum FAKE_FILE_TYPE is_fake_file_path(const char *path)
{
        int i;

        if (!path) {
                return FAKE_FILE_TYPE_NONE;
        }

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

        return FAKE_FILE_TYPE_NONE;
}

enum FAKE_FILE_TYPE is_fake_file(const struct smb_filename *smb_fname)
{
        char *fname = NULL;
        NTSTATUS status;
        enum FAKE_FILE_TYPE ret;

        if (!smb_fname) {
                return FAKE_FILE_TYPE_NONE;
        }

        status = get_full_smb_filename(talloc_tos(), smb_fname, &fname);
        if (!NT_STATUS_IS_OK(status)) {
                return FAKE_FILE_TYPE_NONE;
        }

        ret = is_fake_file_path(fname);

        TALLOC_FREE(fname);

        return ret;
}

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

NTSTATUS open_fake_file(struct smb_request *req, connection_struct *conn,
                                uint16_t current_vuid,
                                enum FAKE_FILE_TYPE fake_file_type,
                                const struct smb_filename *smb_fname,
                                uint32 access_mask,
                                files_struct **result)
{
        files_struct *fsp = NULL;
        NTSTATUS status;

        status = smbd_calculate_access_mask(conn, smb_fname,
                                            false, /* fake files do not exist */
                                            access_mask, &access_mask);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(10, ("open_fake_file: smbd_calculate_access_mask "
                        "on service[%s] file[%s] returned %s\n",
                        lp_servicename(SNUM(conn)),
                        smb_fname_str_dbg(smb_fname),
                        nt_errstr(status)));
                return status;
        }

        /* access check */
        if (geteuid() != sec_initial_uid()) {
                DEBUG(3, ("open_fake_file_shared: access_denied to "
                          "service[%s] file[%s] user[%s]\n",
                          lp_servicename(SNUM(conn)),
                          smb_fname_str_dbg(smb_fname),
                          conn->session_info->unix_name));
                return NT_STATUS_ACCESS_DENIED;

        }

        status = file_new(req, 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",
                 smb_fname_str_dbg(smb_fname), fsp->fnum,
                 (unsigned int)access_mask));

        fsp->conn = conn;
        fsp->fh->fd = -1;
        fsp->vuid = current_vuid;
        fsp->fh->pos = -1;
        fsp->can_lock = False; /* Should this be true ? - No, JRA */
        fsp->access_mask = access_mask;
        status = fsp_set_smb_fname(fsp, smb_fname);
        if (!NT_STATUS_IS_OK(status)) {
                file_free(req, fsp);
                return NT_STATUS_NO_MEMORY;
        }

        fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
        
        if (fsp->fake_file_handle==NULL) {
                file_free(req, fsp);
                return NT_STATUS_NO_MEMORY;
        }

        *result = fsp;
        return NT_STATUS_OK;
}

NTSTATUS close_fake_file(struct smb_request *req, files_struct *fsp)
{
        file_free(req, fsp);
        return NT_STATUS_OK;
}