blob: d91e34f84e79ccbc4f6b935cd7a6904206486be1 [file] [log] [blame]
/*
* vim:noexpandtab:shiftwidth=8:tabstop=8:
*
* Copyright CEA/DAM/DIF (2011)
* contributeur : Philippe DENIEL philippe.deniel@cea.fr
* Thomas LEIBOVICI thomas.leibovici@cea.fr
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* ---------------------------------------
*/
/**
* \file 9p_symlink.c
* \brief 9P version
*
* 9p_symlink.c : _9P_interpretor, request SYMLINK
*
*
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <sys/stat.h>
#include "nfs_core.h"
#include "nfs_exports.h"
#include "log.h"
#include "fsal.h"
#include "9p.h"
int _9p_symlink(struct _9p_request_data *req9p, u32 *plenout, char *preply)
{
char *cursor = req9p->_9pmsg + _9P_HDR_SIZE + _9P_TYPE_SIZE;
u16 *msgtag = NULL;
u32 *fid = NULL;
u16 *name_len = NULL;
char *name_str = NULL;
u16 *linkcontent_len = NULL;
char *linkcontent_str = NULL;
u32 *gid = NULL;
struct _9p_fid *pfid = NULL;
struct _9p_qid qid_symlink;
struct fsal_obj_handle *pentry_symlink = NULL;
char symlink_name[MAXNAMLEN+1];
char *link_content = NULL;
fsal_status_t fsal_status;
uint32_t mode = 0777;
struct attrlist object_attributes;
/* Get data */
_9p_getptr(cursor, msgtag, u16);
_9p_getptr(cursor, fid, u32);
_9p_getstr(cursor, name_len, name_str);
_9p_getstr(cursor, linkcontent_len, linkcontent_str);
_9p_getptr(cursor, gid, u32);
LogDebug(COMPONENT_9P,
"TSYMLINK: tag=%u fid=%u name=%.*s linkcontent=%.*s gid=%u",
(u32) *msgtag, *fid, *name_len, name_str, *linkcontent_len,
linkcontent_str, *gid);
if (*fid >= _9P_FID_PER_CONN)
return _9p_rerror(req9p, msgtag, ERANGE, plenout, preply);
pfid = req9p->pconn->fids[*fid];
/* Check that it is a valid fid */
if (pfid == NULL || pfid->pentry == NULL) {
LogDebug(COMPONENT_9P, "request on invalid fid=%u", *fid);
return _9p_rerror(req9p, msgtag, EIO, plenout, preply);
}
_9p_init_opctx(pfid, req9p);
if ((op_ctx->export_perms->options &
EXPORT_OPTION_WRITE_ACCESS) == 0)
return _9p_rerror(req9p, msgtag, EROFS, plenout, preply);
if (*name_len >= sizeof(symlink_name)) {
LogDebug(COMPONENT_9P, "request with name too long (%u)",
*name_len);
return _9p_rerror(req9p, msgtag, ENAMETOOLONG, plenout,
preply);
}
snprintf(symlink_name, sizeof(symlink_name), "%.*s", *name_len,
name_str);
link_content = gsh_malloc(*linkcontent_len + 1);
memcpy(link_content, linkcontent_str, *linkcontent_len);
link_content[*linkcontent_len] = '\0';
fsal_prepare_attrs(&object_attributes, ATTR_MODE);
object_attributes.mode = mode;
object_attributes.valid_mask = ATTR_MODE;
/* Let's do the job */
/* BUGAZOMEU: @todo : the gid parameter is not used yet,
* flags is not yet used */
fsal_status = fsal_create(pfid->pentry, symlink_name, SYMBOLIC_LINK,
&object_attributes, link_content,
&pentry_symlink, NULL);
/* Release the attributes (may release an inherited ACL) */
fsal_release_attrs(&object_attributes);
gsh_free(link_content);
if (pentry_symlink == NULL) {
return _9p_rerror(req9p, msgtag,
_9p_tools_errno(fsal_status), plenout,
preply);
}
pentry_symlink->obj_ops.put_ref(pentry_symlink);
/* Build the qid */
qid_symlink.type = _9P_QTSYMLINK;
qid_symlink.version = 0;
qid_symlink.path = pentry_symlink->fileid;
/* Build the reply */
_9p_setinitptr(cursor, preply, _9P_RSYMLINK);
_9p_setptr(cursor, msgtag, u16);
_9p_setqid(cursor, qid_symlink);
_9p_setendptr(cursor, preply);
_9p_checkbound(cursor, preply, plenout);
LogDebug(COMPONENT_9P,
"RSYMLINK: tag=%u fid=%u name=%.*s qid=(type=%u,version=%u,path=%llu)",
(u32) *msgtag, *fid, *name_len, name_str, qid_symlink.type,
qid_symlink.version, (unsigned long long)qid_symlink.path);
return 1;
}