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/*
* Module for snapshot management using shell callouts
*
* Copyright (C) David Disseldorp 2013-2015
*
* 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 "include/ntioctl.h"
#include "system/filesys.h"
#include "smbd/smbd.h"
/*
* Check whether a path can be shadow copied. Return the base volume, allowing
* the caller to determine if multiple paths lie on the same base volume.
*/
static NTSTATUS shell_snap_check_path(struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
const char *service_path,
char **base_volume)
{
NTSTATUS status;
const char *cmd;
char *cmd_run;
int ret;
TALLOC_CTX *tmp_ctx;
cmd = lp_parm_const_string(handle->conn->params->service,
"shell_snap", "check path command", "");
if ((cmd == NULL) || (strlen(cmd) == 0)) {
DEBUG(0,
("\"shell_snap:check path command\" not configured\n"));
status = NT_STATUS_NOT_SUPPORTED;
goto err_out;
}
tmp_ctx = talloc_new(mem_ctx);
if (tmp_ctx == NULL) {
status = NT_STATUS_NO_MEMORY;
goto err_out;
}
/* add service path argument */
cmd_run = talloc_asprintf(tmp_ctx, "%s %s", cmd, service_path);
if (cmd_run == NULL) {
status = NT_STATUS_NO_MEMORY;
goto err_tmp_free;
}
ret = smbrun(cmd_run, NULL, NULL);
if (ret != 0) {
DEBUG(0, ("%s failed with %d\n", cmd_run, ret));
status = NT_STATUS_NOT_SUPPORTED;
goto err_tmp_free;
}
/* assume the service path is the base volume */
*base_volume = talloc_strdup(mem_ctx, service_path);
if (*base_volume == NULL) {
status = NT_STATUS_NO_MEMORY;
goto err_tmp_free;
}
status = NT_STATUS_OK;
err_tmp_free:
talloc_free(tmp_ctx);
err_out:
return status;
}
static NTSTATUS shell_snap_create(struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
const char *base_volume,
time_t *tstamp,
bool rw,
char **base_path,
char **snap_path)
{
const char *cmd;
char *cmd_run;
char **qlines;
int numlines, ret;
int fd = -1;
TALLOC_CTX *tmp_ctx;
NTSTATUS status;
cmd = lp_parm_const_string(handle->conn->params->service,
"shell_snap", "create command", "");
if ((cmd == NULL) || (strlen(cmd) == 0)) {
DEBUG(1, ("\"shell_snap:create command\" not configured\n"));
status = NT_STATUS_NOT_SUPPORTED;
goto err_out;
}
tmp_ctx = talloc_new(mem_ctx);
if (tmp_ctx == NULL) {
status = NT_STATUS_NO_MEMORY;
goto err_out;
}
/* add base vol argument */
cmd_run = talloc_asprintf(tmp_ctx, "%s %s", cmd, base_volume);
if (cmd_run == NULL) {
status = NT_STATUS_NO_MEMORY;
goto err_tmp_free;
}
ret = smbrun(cmd_run, &fd, NULL);
talloc_free(cmd_run);
if (ret != 0) {
if (fd != -1) {
close(fd);
}
status = NT_STATUS_UNSUCCESSFUL;
goto err_tmp_free;
}
numlines = 0;
qlines = fd_lines_load(fd, &numlines, PATH_MAX + 1, tmp_ctx);
close(fd);
/* script must return the snapshot path as a single line */
if ((numlines == 0) || (qlines == NULL) || (qlines[0] == NULL)) {
status = NT_STATUS_UNSUCCESSFUL;
goto err_tmp_free;
}
*base_path = talloc_strdup(mem_ctx, base_volume);
if (*base_path == NULL) {
status = NT_STATUS_NO_MEMORY;
goto err_tmp_free;
}
*snap_path = talloc_strdup(mem_ctx, qlines[0]);
if (*snap_path == NULL) {
status = NT_STATUS_NO_MEMORY;
talloc_free(*base_path);
goto err_tmp_free;
}
status = NT_STATUS_OK;
err_tmp_free:
talloc_free(tmp_ctx);
err_out:
return status;
}
static NTSTATUS shell_snap_delete(struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
char *base_path,
char *snap_path)
{
const char *cmd;
char *cmd_run;
int ret;
cmd = lp_parm_const_string(handle->conn->params->service,
"shell_snap", "delete command", "");
if ((cmd == NULL) || (strlen(cmd) == 0)) {
DEBUG(1, ("\"shell_snap:delete command\" not configured\n"));
return NT_STATUS_NOT_SUPPORTED;
}
/* add base path and snap path arguments */
cmd_run = talloc_asprintf(mem_ctx, "%s %s %s",
cmd, base_path, snap_path);
if (cmd_run == NULL) {
return NT_STATUS_NO_MEMORY;
}
ret = smbrun(cmd_run, NULL, NULL);
talloc_free(cmd_run);
if (ret != 0) {
return NT_STATUS_UNSUCCESSFUL;
}
return NT_STATUS_OK;
}
static struct vfs_fn_pointers shell_snap_fns = {
.snap_check_path_fn = shell_snap_check_path,
.snap_create_fn = shell_snap_create,
.snap_delete_fn = shell_snap_delete,
};
static_decl_vfs;
NTSTATUS vfs_shell_snap_init(TALLOC_CTX *ctx)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
"shell_snap", &shell_snap_fns);
}
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