/*
   Unix SMB/CIFS implementation.
   Main SMB reply routines
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Andrew Bartlett      2001
   Copyright (C) Jeremy Allison 1992-2007.
   Copyright (C) Volker Lendecke 2007

   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/>.
*/
/*
   This file handles most of the reply_ calls that the server
   makes to handle specific protocols
*/

#include "includes.h"
#include "libsmb/namequery.h"
#include "system/filesys.h"
#include "printing.h"
#include "locking/share_mode_lock.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "smbd/smbXsrv_open.h"
#include "fake_file.h"
#include "rpc_client/rpc_client.h"
#include "../librpc/gen_ndr/ndr_spoolss_c.h"
#include "rpc_client/cli_spoolss.h"
#include "rpc_client/init_spoolss.h"
#include "rpc_server/rpc_ncacn_np.h"
#include "libcli/security/security.h"
#include "libsmb/nmblib.h"
#include "auth.h"
#include "smbprofile.h"
#include "../lib/tsocket/tsocket.h"
#include "lib/util/tevent_ntstatus.h"
#include "libcli/smb/smb_signing.h"
#include "lib/util/sys_rw_data.h"
#include "librpc/gen_ndr/open_files.h"
#include "smb1_utils.h"
#include "libcli/smb/smb2_posix.h"
#include "lib/util/string_wrappers.h"
#include "source3/printing/rap_jobid.h"
#include "source3/lib/substitute.h"

/****************************************************************************
 Ensure we check the path in *exactly* the same way as W2K for a findfirst/findnext
 path or anything including wildcards.
 We're assuming here that '/' is not the second byte in any multibyte char
 set (a safe assumption). '\\' *may* be the second byte in a multibyte char
 set.
****************************************************************************/

/* Custom version for processing POSIX paths. */
#define IS_PATH_SEP(c,posix_only) ((c) == '/' || (!(posix_only) && (c) == '\\'))

static NTSTATUS check_path_syntax_internal(char *path,
					   bool posix_path)
{
	char *d = path;
	const char *s = path;
	NTSTATUS ret = NT_STATUS_OK;
	bool start_of_name_component = True;
	bool stream_started = false;
	bool last_component_contains_wcard = false;

	while (*s) {
		if (stream_started) {
			switch (*s) {
			case '/':
			case '\\':
				return NT_STATUS_OBJECT_NAME_INVALID;
			case ':':
				if (s[1] == '\0') {
					return NT_STATUS_OBJECT_NAME_INVALID;
				}
				if (strchr_m(&s[1], ':')) {
					return NT_STATUS_OBJECT_NAME_INVALID;
				}
				break;
			}
		}

		if ((*s == ':') && !posix_path && !stream_started) {
			if (last_component_contains_wcard) {
				return NT_STATUS_OBJECT_NAME_INVALID;
			}
			/* Stream names allow more characters than file names.
			   We're overloading posix_path here to allow a wider
			   range of characters. If stream_started is true this
			   is still a Windows path even if posix_path is true.
			   JRA.
			*/
			stream_started = true;
			start_of_name_component = false;
			posix_path = true;

			if (s[1] == '\0') {
				return NT_STATUS_OBJECT_NAME_INVALID;
			}
		}

		if (!stream_started && IS_PATH_SEP(*s,posix_path)) {
			/*
			 * Safe to assume is not the second part of a mb char
			 * as this is handled below.
			 */
			/* Eat multiple '/' or '\\' */
			while (IS_PATH_SEP(*s,posix_path)) {
				s++;
			}
			if ((d != path) && (*s != '\0')) {
				/* We only care about non-leading or trailing '/' or '\\' */
				*d++ = '/';
			}

			start_of_name_component = True;
			/* New component. */
			last_component_contains_wcard = false;
			continue;
		}

		if (start_of_name_component) {
			if ((s[0] == '.') && (s[1] == '.') && (IS_PATH_SEP(s[2],posix_path) || s[2] == '\0')) {
				/* Uh oh - "/../" or "\\..\\"  or "/..\0" or "\\..\0" ! */

				/*
				 * No mb char starts with '.' so we're safe checking the directory separator here.
				 */

				/* If  we just added a '/' - delete it */
				if ((d > path) && (*(d-1) == '/')) {
					*(d-1) = '\0';
					d--;
				}

				/* Are we at the start ? Can't go back further if so. */
				if (d <= path) {
					ret = NT_STATUS_OBJECT_PATH_SYNTAX_BAD;
					break;
				}
				/* Go back one level... */
				/* We know this is safe as '/' cannot be part of a mb sequence. */
				/* NOTE - if this assumption is invalid we are not in good shape... */
				/* Decrement d first as d points to the *next* char to write into. */
				for (d--; d > path; d--) {
					if (*d == '/')
						break;
				}
				s += 2; /* Else go past the .. */
				/* We're still at the start of a name component, just the previous one. */
				continue;

			} else if ((s[0] == '.') && ((s[1] == '\0') || IS_PATH_SEP(s[1],posix_path))) {
				if (posix_path) {
					/* Eat the '.' */
					s++;
					continue;
				}
			}

		}

		if (!(*s & 0x80)) {
			if (!posix_path) {
				if (*s <= 0x1f || *s == '|') {
					return NT_STATUS_OBJECT_NAME_INVALID;
				}
				switch (*s) {
					case '*':
					case '?':
					case '<':
					case '>':
					case '"':
						last_component_contains_wcard = true;
						break;
					default:
						break;
				}
			}
			*d++ = *s++;
		} else {
			size_t siz;
			/* Get the size of the next MB character. */
			next_codepoint(s,&siz);
			switch(siz) {
				case 5:
					*d++ = *s++;
					FALL_THROUGH;
				case 4:
					*d++ = *s++;
					FALL_THROUGH;
				case 3:
					*d++ = *s++;
					FALL_THROUGH;
				case 2:
					*d++ = *s++;
					FALL_THROUGH;
				case 1:
					*d++ = *s++;
					break;
				default:
					DEBUG(0,("check_path_syntax_internal: character length assumptions invalid !\n"));
					*d = '\0';
					return NT_STATUS_INVALID_PARAMETER;
			}
		}
		start_of_name_component = False;
	}

	*d = '\0';

	return ret;
}

/****************************************************************************
 Ensure we check the path in *exactly* the same way as W2K for regular pathnames.
 No wildcards allowed.
****************************************************************************/

NTSTATUS check_path_syntax(char *path)
{
	return check_path_syntax_internal(path, false);
}

/****************************************************************************
 Check the path for a POSIX client.
 We're assuming here that '/' is not the second byte in any multibyte char
 set (a safe assumption).
****************************************************************************/

NTSTATUS check_path_syntax_posix(char *path)
{
	return check_path_syntax_internal(path, true);
}

/****************************************************************************
 Pull a string and check the path allowing a wildcard - provide for error return.
 Passes in posix flag.
****************************************************************************/

static size_t srvstr_get_path_internal(TALLOC_CTX *ctx,
			const char *base_ptr,
			uint16_t smb_flags2,
			char **pp_dest,
			const char *src,
			size_t src_len,
			int flags,
			bool posix_pathnames,
			NTSTATUS *err)
{
	size_t ret;

	*pp_dest = NULL;

	ret = srvstr_pull_talloc(ctx, base_ptr, smb_flags2, pp_dest, src,
				 src_len, flags);

	if (!*pp_dest) {
		*err = NT_STATUS_INVALID_PARAMETER;
		return ret;
	}

	if (smb_flags2 & FLAGS2_DFS_PATHNAMES) {
		/*
		 * For a DFS path the function parse_dfs_path()
		 * will do the path processing, just make a copy.
		 */
		*err = NT_STATUS_OK;
		return ret;
	}

	if (posix_pathnames) {
		*err = check_path_syntax_posix(*pp_dest);
	} else {
		*err = check_path_syntax(*pp_dest);
	}

	return ret;
}

/****************************************************************************
 Pull a string and check the path - provide for error return.
****************************************************************************/

size_t srvstr_get_path(TALLOC_CTX *ctx,
			const char *base_ptr,
			uint16_t smb_flags2,
			char **pp_dest,
			const char *src,
			size_t src_len,
			int flags,
			NTSTATUS *err)
{
	return srvstr_get_path_internal(ctx,
			base_ptr,
			smb_flags2,
			pp_dest,
			src,
			src_len,
			flags,
			false,
			err);
}

/****************************************************************************
 Pull a string and check the path - provide for error return.
 posix_pathnames version.
****************************************************************************/

size_t srvstr_get_path_posix(TALLOC_CTX *ctx,
			const char *base_ptr,
			uint16_t smb_flags2,
			char **pp_dest,
			const char *src,
			size_t src_len,
			int flags,
			NTSTATUS *err)
{
	return srvstr_get_path_internal(ctx,
			base_ptr,
			smb_flags2,
			pp_dest,
			src,
			src_len,
			flags,
			true,
			err);
}


size_t srvstr_get_path_req(TALLOC_CTX *mem_ctx, struct smb_request *req,
				 char **pp_dest, const char *src, int flags,
				 NTSTATUS *err)
{
	ssize_t bufrem = smbreq_bufrem(req, src);

	if (bufrem < 0) {
		*err = NT_STATUS_INVALID_PARAMETER;
		return 0;
	}

	if (req->posix_pathnames) {
		return srvstr_get_path_internal(mem_ctx,
				(const char *)req->inbuf,
				req->flags2,
				pp_dest,
				src,
				bufrem,
				flags,
				true,
				err);
	} else {
		return srvstr_get_path_internal(mem_ctx,
				(const char *)req->inbuf,
				req->flags2,
				pp_dest,
				src,
				bufrem,
				flags,
				false,
				err);
	}
}

/**
 * pull a string from the smb_buf part of a packet. In this case the
 * string can either be null terminated or it can be terminated by the
 * end of the smbbuf area
 */
size_t srvstr_pull_req_talloc(TALLOC_CTX *ctx, struct smb_request *req,
			      char **dest, const uint8_t *src, int flags)
{
	ssize_t bufrem = smbreq_bufrem(req, src);

	if (bufrem < 0) {
		return 0;
	}

	return pull_string_talloc(ctx, req->inbuf, req->flags2, dest, src,
				  bufrem, flags);
}

/****************************************************************************
 Check if we have a correct fsp pointing to a file. Basic check for open fsp.
****************************************************************************/

bool check_fsp_open(connection_struct *conn, struct smb_request *req,
		    files_struct *fsp)
{
	if ((fsp == NULL) || (conn == NULL)) {
		reply_nterror(req, NT_STATUS_INVALID_HANDLE);
		return False;
	}
	if ((conn != fsp->conn) || (req->vuid != fsp->vuid)) {
		reply_nterror(req, NT_STATUS_INVALID_HANDLE);
		return False;
	}
	return True;
}

/****************************************************************************
 Check if we have a correct fsp pointing to a file.
****************************************************************************/

bool check_fsp(connection_struct *conn, struct smb_request *req,
	       files_struct *fsp)
{
	if (!check_fsp_open(conn, req, fsp)) {
		return False;
	}
	if (fsp->fsp_flags.is_directory) {
		reply_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
		return False;
	}
	if (fsp_get_pathref_fd(fsp) == -1) {
		reply_nterror(req, NT_STATUS_ACCESS_DENIED);
		return False;
	}
	fsp->num_smb_operations++;
	return True;
}

/****************************************************************************
 Check if we have a correct fsp pointing to a quota fake file. Replacement for
 the CHECK_NTQUOTA_HANDLE_OK macro.
****************************************************************************/

bool check_fsp_ntquota_handle(connection_struct *conn, struct smb_request *req,
			      files_struct *fsp)
{
	if (!check_fsp_open(conn, req, fsp)) {
		return false;
	}

	if (fsp->fsp_flags.is_directory) {
		return false;
	}

	if (fsp->fake_file_handle == NULL) {
		return false;
	}

	if (fsp->fake_file_handle->type != FAKE_FILE_TYPE_QUOTA) {
		return false;
	}

	if (fsp->fake_file_handle->private_data == NULL) {
		return false;
	}

	return true;
}

/****************************************************************************
 Return the port number we've bound to on a socket.
****************************************************************************/

static int get_socket_port(int fd)
{
	struct samba_sockaddr saddr = {
		.sa_socklen = sizeof(struct sockaddr_storage),
	};

	if (fd == -1) {
		return -1;
	}

	if (getsockname(fd, &saddr.u.sa, &saddr.sa_socklen) < 0) {
		int level = (errno == ENOTCONN) ? 2 : 0;
		DEBUG(level, ("getsockname failed. Error was %s\n",
			       strerror(errno)));
		return -1;
	}

#if defined(HAVE_IPV6)
	if (saddr.u.sa.sa_family == AF_INET6) {
		return ntohs(saddr.u.in6.sin6_port);
	}
#endif
	if (saddr.u.sa.sa_family == AF_INET) {
		return ntohs(saddr.u.in.sin_port);
	}
	return -1;
}

static bool netbios_session_retarget(struct smbXsrv_connection *xconn,
				     const char *name, int name_type)
{
	char *trim_name;
	char *trim_name_type;
	const char *retarget_parm;
	char *retarget;
	char *p;
	int retarget_type = 0x20;
	int retarget_port = NBT_SMB_PORT;
	struct sockaddr_storage retarget_addr;
	struct sockaddr_in *in_addr;
	bool ret = false;
	uint8_t outbuf[10];

	if (get_socket_port(xconn->transport.sock) != NBT_SMB_PORT) {
		return false;
	}

	trim_name = talloc_strdup(talloc_tos(), name);
	if (trim_name == NULL) {
		goto fail;
	}
	trim_char(trim_name, ' ', ' ');

	trim_name_type = talloc_asprintf(trim_name, "%s#%2.2x", trim_name,
					 name_type);
	if (trim_name_type == NULL) {
		goto fail;
	}

	retarget_parm = lp_parm_const_string(-1, "netbios retarget",
					     trim_name_type, NULL);
	if (retarget_parm == NULL) {
		retarget_parm = lp_parm_const_string(-1, "netbios retarget",
						     trim_name, NULL);
	}
	if (retarget_parm == NULL) {
		goto fail;
	}

	retarget = talloc_strdup(trim_name, retarget_parm);
	if (retarget == NULL) {
		goto fail;
	}

	DEBUG(10, ("retargeting %s to %s\n", trim_name_type, retarget));

	p = strchr(retarget, ':');
	if (p != NULL) {
		*p++ = '\0';
		retarget_port = atoi(p);
	}

	p = strchr_m(retarget, '#');
	if (p != NULL) {
		*p++ = '\0';
		if (sscanf(p, "%x", &retarget_type) != 1) {
			goto fail;
		}
	}

	ret = resolve_name(retarget, &retarget_addr, retarget_type, false);
	if (!ret) {
		DEBUG(10, ("could not resolve %s\n", retarget));
		goto fail;
	}

	if (retarget_addr.ss_family != AF_INET) {
		DEBUG(10, ("Retarget target not an IPv4 addr\n"));
		goto fail;
	}

	in_addr = (struct sockaddr_in *)(void *)&retarget_addr;

	_smb_setlen(outbuf, 6);
	SCVAL(outbuf, 0, 0x84);
	*(uint32_t *)(outbuf+4) = in_addr->sin_addr.s_addr;
	*(uint16_t *)(outbuf+8) = htons(retarget_port);

	if (!srv_send_smb(xconn, (char *)outbuf, false, 0, false,
			  NULL)) {
		exit_server_cleanly("netbios_session_retarget: srv_send_smb "
				    "failed.");
	}

	ret = true;
 fail:
	TALLOC_FREE(trim_name);
	return ret;
}

static void reply_called_name_not_present(char *outbuf)
{
	smb_setlen(outbuf, 1);
	SCVAL(outbuf, 0, 0x83);
	SCVAL(outbuf, 4, 0x82);
}

/****************************************************************************
 Reply to a (netbios-level) special message.
****************************************************************************/

void reply_special(struct smbXsrv_connection *xconn, char *inbuf, size_t inbuf_size)
{
	struct smbd_server_connection *sconn = xconn->client->sconn;
	int msg_type = CVAL(inbuf,0);
	int msg_flags = CVAL(inbuf,1);
	/*
	 * We only really use 4 bytes of the outbuf, but for the smb_setlen
	 * calculation & friends (srv_send_smb uses that) we need the full smb
	 * header.
	 */
	char outbuf[smb_size];

	memset(outbuf, '\0', sizeof(outbuf));

	smb_setlen(outbuf,0);

	switch (msg_type) {
	case NBSSrequest: /* session request */
	{
		/* inbuf_size is guarenteed to be at least 4. */
		fstring name1,name2;
		int name_type1, name_type2;
		int name_len1, name_len2;

		*name1 = *name2 = 0;

		if (xconn->transport.nbt.got_session) {
			exit_server_cleanly("multiple session request not permitted");
		}

		SCVAL(outbuf,0,NBSSpositive);
		SCVAL(outbuf,3,0);

		/* inbuf_size is guaranteed to be at least 4. */
		name_len1 = name_len((unsigned char *)(inbuf+4),inbuf_size - 4);
		if (name_len1 <= 0 || name_len1 > inbuf_size - 4) {
			DEBUG(0,("Invalid name length in session request\n"));
			reply_called_name_not_present(outbuf);
			break;
		}
		name_len2 = name_len((unsigned char *)(inbuf+4+name_len1),inbuf_size - 4 - name_len1);
		if (name_len2 <= 0 || name_len2 > inbuf_size - 4 - name_len1) {
			DEBUG(0,("Invalid name length in session request\n"));
			reply_called_name_not_present(outbuf);
			break;
		}

		name_type1 = name_extract((unsigned char *)inbuf,
				inbuf_size,(unsigned int)4,name1);
		name_type2 = name_extract((unsigned char *)inbuf,
				inbuf_size,(unsigned int)(4 + name_len1),name2);

		if (name_type1 == -1 || name_type2 == -1) {
			DEBUG(0,("Invalid name type in session request\n"));
			reply_called_name_not_present(outbuf);
			break;
		}

		DEBUG(2,("netbios connect: name1=%s0x%x name2=%s0x%x\n",
			 name1, name_type1, name2, name_type2));

		if (netbios_session_retarget(xconn, name1, name_type1)) {
			exit_server_cleanly("retargeted client");
		}

		/*
		 * Windows NT/2k uses "*SMBSERVER" and XP uses
		 * "*SMBSERV" arrggg!!!
		 */
		if (strequal(name1, "*SMBSERVER     ")
		    || strequal(name1, "*SMBSERV       "))  {
			char *raddr;

			raddr = tsocket_address_inet_addr_string(sconn->remote_address,
								 talloc_tos());
			if (raddr == NULL) {
				exit_server_cleanly("could not allocate raddr");
			}

			fstrcpy(name1, raddr);
		}

		set_local_machine_name(name1, True);
		set_remote_machine_name(name2, True);

		if (is_ipaddress(sconn->remote_hostname)) {
			char *p = discard_const_p(char, sconn->remote_hostname);

			talloc_free(p);

			sconn->remote_hostname = talloc_strdup(sconn,
						get_remote_machine_name());
			if (sconn->remote_hostname == NULL) {
				exit_server_cleanly("could not copy remote name");
			}
			xconn->remote_hostname = sconn->remote_hostname;
		}

		DEBUG(2,("netbios connect: local=%s remote=%s, name type = %x\n",
			 get_local_machine_name(), get_remote_machine_name(),
			 name_type2));

		if (name_type2 == 'R') {
			/* We are being asked for a pathworks session ---
			   no thanks! */
			reply_called_name_not_present(outbuf);
			break;
		}

		reload_services(sconn, conn_snum_used, true);
		reopen_logs();

		xconn->transport.nbt.got_session = true;
		break;
	}

	case 0x89: /* session keepalive request
		      (some old clients produce this?) */
		SCVAL(outbuf,0,NBSSkeepalive);
		SCVAL(outbuf,3,0);
		break;

	case NBSSpositive: /* positive session response */
	case NBSSnegative: /* negative session response */
	case NBSSretarget: /* retarget session response */
		DEBUG(0,("Unexpected session response\n"));
		break;

	case NBSSkeepalive: /* session keepalive */
	default:
		return;
	}

	DEBUG(5,("init msg_type=0x%x msg_flags=0x%x\n",
		    msg_type, msg_flags));

	if (!srv_send_smb(xconn, outbuf, false, 0, false, NULL)) {
		exit_server_cleanly("reply_special: srv_send_smb failed.");
	}

	if (CVAL(outbuf, 0) != 0x82) {
		exit_server_cleanly("invalid netbios session");
	}
	return;
}

/*******************************************************************
 * unlink a file with all relevant access checks
 *******************************************************************/

NTSTATUS unlink_internals(connection_struct *conn,
			struct smb_request *req,
			uint32_t dirtype,
			struct smb_filename *smb_fname)
{
	uint32_t fattr;
	files_struct *fsp;
	uint32_t dirtype_orig = dirtype;
	NTSTATUS status;
	int ret;
	struct smb2_create_blobs *posx = NULL;

	if (dirtype == 0) {
		dirtype = FILE_ATTRIBUTE_NORMAL;
	}

	DBG_DEBUG("%s, dirtype = %d\n",
		  smb_fname_str_dbg(smb_fname),
		  dirtype);

	if (!CAN_WRITE(conn)) {
		return NT_STATUS_MEDIA_WRITE_PROTECTED;
	}

	ret = vfs_stat(conn, smb_fname);
	if (ret != 0) {
		return map_nt_error_from_unix(errno);
	}

	fattr = fdos_mode(smb_fname->fsp);

	if (dirtype & FILE_ATTRIBUTE_NORMAL) {
		dirtype = FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_ARCHIVE|FILE_ATTRIBUTE_READONLY;
	}

	dirtype &= (FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_ARCHIVE|FILE_ATTRIBUTE_READONLY|FILE_ATTRIBUTE_HIDDEN|FILE_ATTRIBUTE_SYSTEM);
	if (!dirtype) {
		return NT_STATUS_NO_SUCH_FILE;
	}

	if (!dir_check_ftype(fattr, dirtype)) {
		if (fattr & FILE_ATTRIBUTE_DIRECTORY) {
			return NT_STATUS_FILE_IS_A_DIRECTORY;
		}
		return NT_STATUS_NO_SUCH_FILE;
	}

	if (dirtype_orig & 0x8000) {
		/* These will never be set for POSIX. */
		return NT_STATUS_NO_SUCH_FILE;
	}

#if 0
	if ((fattr & dirtype) & FILE_ATTRIBUTE_DIRECTORY) {
                return NT_STATUS_FILE_IS_A_DIRECTORY;
        }

        if ((fattr & ~dirtype) & (FILE_ATTRIBUTE_HIDDEN|FILE_ATTRIBUTE_SYSTEM)) {
                return NT_STATUS_NO_SUCH_FILE;
        }

	if (dirtype & 0xFF00) {
		/* These will never be set for POSIX. */
		return NT_STATUS_NO_SUCH_FILE;
	}

	dirtype &= 0xFF;
	if (!dirtype) {
		return NT_STATUS_NO_SUCH_FILE;
	}

	/* Can't delete a directory. */
	if (fattr & FILE_ATTRIBUTE_DIRECTORY) {
		return NT_STATUS_FILE_IS_A_DIRECTORY;
	}
#endif

#if 0 /* JRATEST */
	else if (dirtype & FILE_ATTRIBUTE_DIRECTORY) /* Asked for a directory and it isn't. */
		return NT_STATUS_OBJECT_NAME_INVALID;
#endif /* JRATEST */

	if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
		status = make_smb2_posix_create_ctx(
			talloc_tos(), &posx, 0777);
		if (!NT_STATUS_IS_OK(status)) {
			DBG_WARNING("make_smb2_posix_create_ctx failed: %s\n",
				    nt_errstr(status));
			return status;
		}
	}

	/* On open checks the open itself will check the share mode, so
	   don't do it here as we'll get it wrong. */

	status = SMB_VFS_CREATE_FILE
		(conn,			/* conn */
		 req,			/* req */
		 smb_fname,		/* fname */
		 DELETE_ACCESS,		/* access_mask */
		 FILE_SHARE_NONE,	/* share_access */
		 FILE_OPEN,		/* create_disposition*/
		 FILE_NON_DIRECTORY_FILE, /* create_options */
		 FILE_ATTRIBUTE_NORMAL,	/* file_attributes */
		 0,			/* oplock_request */
		 NULL,			/* lease */
		 0,			/* allocation_size */
		 0,			/* private_flags */
		 NULL,			/* sd */
		 NULL,			/* ea_list */
		 &fsp,			/* result */
		 NULL,			/* pinfo */
		 posx,			/* in_context_blobs */
		 NULL);			/* out_context_blobs */

	TALLOC_FREE(posx);

	if (!NT_STATUS_IS_OK(status)) {
		DBG_DEBUG("SMB_VFS_CREATEFILE failed: %s\n",
			   nt_errstr(status));
		return status;
	}

	status = can_set_delete_on_close(fsp, fattr);
	if (!NT_STATUS_IS_OK(status)) {
		DBG_DEBUG("can_set_delete_on_close for file %s - "
			"(%s)\n",
			smb_fname_str_dbg(smb_fname),
			nt_errstr(status));
		close_file_free(req, &fsp, NORMAL_CLOSE);
		return status;
	}

	/* The set is across all open files on this dev/inode pair. */
	if (!set_delete_on_close(fsp, True,
				conn->session_info->security_token,
				conn->session_info->unix_token)) {
		close_file_free(req, &fsp, NORMAL_CLOSE);
		return NT_STATUS_ACCESS_DENIED;
	}

	return close_file_free(req, &fsp, NORMAL_CLOSE);
}

/****************************************************************************
 Fake (read/write) sendfile. Returns -1 on read or write fail.
****************************************************************************/

ssize_t fake_sendfile(struct smbXsrv_connection *xconn, files_struct *fsp,
		      off_t startpos, size_t nread)
{
	size_t bufsize;
	size_t tosend = nread;
	char *buf;

	if (nread == 0) {
		return 0;
	}

	bufsize = MIN(nread, 65536);

	if (!(buf = SMB_MALLOC_ARRAY(char, bufsize))) {
		return -1;
	}

	while (tosend > 0) {
		ssize_t ret;
		size_t cur_read;

		cur_read = MIN(tosend, bufsize);
		ret = read_file(fsp,buf,startpos,cur_read);
		if (ret == -1) {
			SAFE_FREE(buf);
			return -1;
		}

		/* If we had a short read, fill with zeros. */
		if (ret < cur_read) {
			memset(buf + ret, '\0', cur_read - ret);
		}

		ret = write_data(xconn->transport.sock, buf, cur_read);
		if (ret != cur_read) {
			int saved_errno = errno;
			/*
			 * Try and give an error message saying what
			 * client failed.
			 */
			DEBUG(0, ("write_data failed for client %s. "
				  "Error %s\n",
				  smbXsrv_connection_dbg(xconn),
				  strerror(saved_errno)));
			SAFE_FREE(buf);
			errno = saved_errno;
			return -1;
		}
		tosend -= cur_read;
		startpos += cur_read;
	}

	SAFE_FREE(buf);
	return (ssize_t)nread;
}

/****************************************************************************
 Deal with the case of sendfile reading less bytes from the file than
 requested. Fill with zeros (all we can do). Returns 0 on success
****************************************************************************/

ssize_t sendfile_short_send(struct smbXsrv_connection *xconn,
			    files_struct *fsp,
			    ssize_t nread,
			    size_t headersize,
			    size_t smb_maxcnt)
{
#define SHORT_SEND_BUFSIZE 1024
	if (nread < headersize) {
		DEBUG(0,("sendfile_short_send: sendfile failed to send "
			"header for file %s (%s). Terminating\n",
			fsp_str_dbg(fsp), strerror(errno)));
		return -1;
	}

	nread -= headersize;

	if (nread < smb_maxcnt) {
		char buf[SHORT_SEND_BUFSIZE] = { 0 };

		DEBUG(0,("sendfile_short_send: filling truncated file %s "
			"with zeros !\n", fsp_str_dbg(fsp)));

		while (nread < smb_maxcnt) {
			/*
			 * We asked for the real file size and told sendfile
			 * to not go beyond the end of the file. But it can
			 * happen that in between our fstat call and the
			 * sendfile call the file was truncated. This is very
			 * bad because we have already announced the larger
			 * number of bytes to the client.
			 *
			 * The best we can do now is to send 0-bytes, just as
			 * a read from a hole in a sparse file would do.
			 *
			 * This should happen rarely enough that I don't care
			 * about efficiency here :-)
			 */
			size_t to_write;
			ssize_t ret;

			to_write = MIN(SHORT_SEND_BUFSIZE, smb_maxcnt - nread);
			ret = write_data(xconn->transport.sock, buf, to_write);
			if (ret != to_write) {
				int saved_errno = errno;
				/*
				 * Try and give an error message saying what
				 * client failed.
				 */
				DEBUG(0, ("write_data failed for client %s. "
					  "Error %s\n",
					  smbXsrv_connection_dbg(xconn),
					  strerror(saved_errno)));
				errno = saved_errno;
				return -1;
			}
			nread += to_write;
		}
	}

	return 0;
}

/*******************************************************************
 Check if a user is allowed to rename a file.
********************************************************************/

static NTSTATUS can_rename(connection_struct *conn, files_struct *fsp,
			uint16_t dirtype)
{
	if (!CAN_WRITE(conn)) {
		return NT_STATUS_MEDIA_WRITE_PROTECTED;
	}

	if ((dirtype & (FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM)) !=
			(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM)) {
		/* Only bother to read the DOS attribute if we might deny the
		   rename on the grounds of attribute mismatch. */
		uint32_t fmode = fdos_mode(fsp);
		if ((fmode & ~dirtype) & (FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM)) {
			return NT_STATUS_NO_SUCH_FILE;
		}
	}

	if (S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
		if (fsp->posix_flags & FSP_POSIX_FLAGS_RENAME) {
			return NT_STATUS_OK;
		}

		/* If no pathnames are open below this
		   directory, allow the rename. */

		if (lp_strict_rename(SNUM(conn))) {
			/*
			 * Strict rename, check open file db.
			 */
			if (have_file_open_below(fsp->conn, fsp->fsp_name)) {
				return NT_STATUS_ACCESS_DENIED;
			}
		} else if (file_find_subpath(fsp)) {
			/*
			 * No strict rename, just look in local process.
			 */
			return NT_STATUS_ACCESS_DENIED;
		}
		return NT_STATUS_OK;
	}

	if (fsp->access_mask & (DELETE_ACCESS|FILE_WRITE_ATTRIBUTES)) {
		return NT_STATUS_OK;
	}

	return NT_STATUS_ACCESS_DENIED;
}

/****************************************************************************
 Ensure open files have their names updated. Updated to notify other smbd's
 asynchronously.
****************************************************************************/

static void rename_open_files(connection_struct *conn,
			      struct share_mode_lock *lck,
			      struct file_id id,
			      uint32_t orig_name_hash,
			      const struct smb_filename *smb_fname_dst)
{
	files_struct *fsp;
	bool did_rename = False;
	NTSTATUS status;
	uint32_t new_name_hash = 0;

	for(fsp = file_find_di_first(conn->sconn, id, false); fsp;
	    fsp = file_find_di_next(fsp, false)) {
		SMB_STRUCT_STAT fsp_orig_sbuf;
		struct file_id_buf idbuf;
		/* fsp_name is a relative path under the fsp. To change this for other
		   sharepaths we need to manipulate relative paths. */
		/* TODO - create the absolute path and manipulate the newname
		   relative to the sharepath. */
		if (!strequal(fsp->conn->connectpath, conn->connectpath)) {
			continue;
		}
		if (fsp->name_hash != orig_name_hash) {
			continue;
		}
		DBG_DEBUG("renaming file %s "
			  "(file_id %s) from %s -> %s\n",
			  fsp_fnum_dbg(fsp),
			  file_id_str_buf(fsp->file_id, &idbuf),
			  fsp_str_dbg(fsp),
			  smb_fname_str_dbg(smb_fname_dst));

		/*
		 * The incoming smb_fname_dst here has an
		 * invalid stat struct (it must not have
		 * existed for the rename to succeed).
		 * Preserve the existing stat from the
		 * open fsp after fsp_set_smb_fname()
		 * overwrites with the invalid stat.
		 *
		 * We will do an fstat before returning
		 * any of this metadata to the client anyway.
		 */
		fsp_orig_sbuf = fsp->fsp_name->st;
		status = fsp_set_smb_fname(fsp, smb_fname_dst);
		if (NT_STATUS_IS_OK(status)) {
			did_rename = True;
			new_name_hash = fsp->name_hash;
			/* Restore existing stat. */
			fsp->fsp_name->st = fsp_orig_sbuf;
		}
	}

	if (!did_rename) {
		struct file_id_buf idbuf;
		DBG_DEBUG("no open files on file_id %s "
			  "for %s\n",
			  file_id_str_buf(id, &idbuf),
			  smb_fname_str_dbg(smb_fname_dst));
	}

	/* Send messages to all smbd's (not ourself) that the name has changed. */
	rename_share_filename(conn->sconn->msg_ctx, lck, id, conn->connectpath,
			      orig_name_hash, new_name_hash,
			      smb_fname_dst);

}

/****************************************************************************
 We need to check if the source path is a parent directory of the destination
 (ie. a rename of /foo/bar/baz -> /foo/bar/baz/bibble/bobble. If so we must
 refuse the rename with a sharing violation. Under UNIX the above call can
 *succeed* if /foo/bar/baz is a symlink to another area in the share. We
 probably need to check that the client is a Windows one before disallowing
 this as a UNIX client (one with UNIX extensions) can know the source is a
 symlink and make this decision intelligently. Found by an excellent bug
 report from <AndyLiebman@aol.com>.
****************************************************************************/

static bool rename_path_prefix_equal(const struct smb_filename *smb_fname_src,
				     const struct smb_filename *smb_fname_dst)
{
	const char *psrc = smb_fname_src->base_name;
	const char *pdst = smb_fname_dst->base_name;
	size_t slen;

	if (psrc[0] == '.' && psrc[1] == '/') {
		psrc += 2;
	}
	if (pdst[0] == '.' && pdst[1] == '/') {
		pdst += 2;
	}
	if ((slen = strlen(psrc)) > strlen(pdst)) {
		return False;
	}
	return ((memcmp(psrc, pdst, slen) == 0) && pdst[slen] == '/');
}

/*
 * Do the notify calls from a rename
 */

static void notify_rename(connection_struct *conn, bool is_dir,
			  const struct smb_filename *smb_fname_src,
			  const struct smb_filename *smb_fname_dst)
{
	char *parent_dir_src = NULL;
	char *parent_dir_dst = NULL;
	uint32_t mask;

	mask = is_dir ? FILE_NOTIFY_CHANGE_DIR_NAME
		: FILE_NOTIFY_CHANGE_FILE_NAME;

	if (!parent_dirname(talloc_tos(), smb_fname_src->base_name,
			    &parent_dir_src, NULL) ||
	    !parent_dirname(talloc_tos(), smb_fname_dst->base_name,
			    &parent_dir_dst, NULL)) {
		goto out;
	}

	if (strcmp(parent_dir_src, parent_dir_dst) == 0) {
		notify_fname(conn, NOTIFY_ACTION_OLD_NAME, mask,
			     smb_fname_src->base_name);
		notify_fname(conn, NOTIFY_ACTION_NEW_NAME, mask,
			     smb_fname_dst->base_name);
	}
	else {
		notify_fname(conn, NOTIFY_ACTION_REMOVED, mask,
			     smb_fname_src->base_name);
		notify_fname(conn, NOTIFY_ACTION_ADDED, mask,
			     smb_fname_dst->base_name);
	}

	/* this is a strange one. w2k3 gives an additional event for
	   CHANGE_ATTRIBUTES and CHANGE_CREATION on the new file when renaming
	   files, but not directories */
	if (!is_dir) {
		notify_fname(conn, NOTIFY_ACTION_MODIFIED,
			     FILE_NOTIFY_CHANGE_ATTRIBUTES
			     |FILE_NOTIFY_CHANGE_CREATION,
			     smb_fname_dst->base_name);
	}
 out:
	TALLOC_FREE(parent_dir_src);
	TALLOC_FREE(parent_dir_dst);
}

/****************************************************************************
 Returns an error if the parent directory for a filename is open in an
 incompatible way.
****************************************************************************/

static NTSTATUS parent_dirname_compatible_open(connection_struct *conn,
					const struct smb_filename *smb_fname_dst_in)
{
	struct smb_filename *smb_fname_parent = NULL;
	struct file_id id;
	files_struct *fsp = NULL;
	int ret;
	NTSTATUS status;

	status = SMB_VFS_PARENT_PATHNAME(conn,
					 talloc_tos(),
					 smb_fname_dst_in,
					 &smb_fname_parent,
					 NULL);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	ret = vfs_stat(conn, smb_fname_parent);
	if (ret == -1) {
		return map_nt_error_from_unix(errno);
	}

	/*
	 * We're only checking on this smbd here, mostly good
	 * enough.. and will pass tests.
	 */

	id = vfs_file_id_from_sbuf(conn, &smb_fname_parent->st);
	for (fsp = file_find_di_first(conn->sconn, id, true); fsp;
			fsp = file_find_di_next(fsp, true)) {
		if (fsp->access_mask & DELETE_ACCESS) {
			return NT_STATUS_SHARING_VIOLATION;
                }
        }
	return NT_STATUS_OK;
}

/****************************************************************************
 Rename an open file - given an fsp.
****************************************************************************/

NTSTATUS rename_internals_fsp(connection_struct *conn,
			files_struct *fsp,
			struct smb_filename *smb_fname_dst_in,
			const char *dst_original_lcomp,
			uint32_t attrs,
			bool replace_if_exists)
{
	TALLOC_CTX *ctx = talloc_tos();
	struct smb_filename *parent_dir_fname_dst = NULL;
	struct smb_filename *parent_dir_fname_dst_atname = NULL;
	struct smb_filename *parent_dir_fname_src = NULL;
	struct smb_filename *parent_dir_fname_src_atname = NULL;
	struct smb_filename *smb_fname_dst = NULL;
	NTSTATUS status = NT_STATUS_OK;
	struct share_mode_lock *lck = NULL;
	uint32_t access_mask = SEC_DIR_ADD_FILE;
	bool dst_exists, old_is_stream, new_is_stream;
	int ret;
	bool case_sensitive = (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) ?
				true : conn->case_sensitive;
	bool case_preserve = (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) ?
				true : conn->case_preserve;

	status = parent_dirname_compatible_open(conn, smb_fname_dst_in);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	if (file_has_open_streams(fsp)) {
		return NT_STATUS_ACCESS_DENIED;
	}

	/* Make a copy of the dst smb_fname structs */

	smb_fname_dst = cp_smb_filename(ctx, smb_fname_dst_in);
	if (smb_fname_dst == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto out;
	}

	/*
	 * Check for special case with case preserving and not
	 * case sensitive. If the new last component differs from the original
	 * last component only by case, then we should allow
	 * the rename (user is trying to change the case of the
	 * filename).
	 */
	if (!case_sensitive && case_preserve &&
	    strequal(fsp->fsp_name->base_name, smb_fname_dst->base_name) &&
	    strequal(fsp->fsp_name->stream_name, smb_fname_dst->stream_name)) {
		char *fname_dst_parent = NULL;
		const char *fname_dst_lcomp = NULL;
		char *orig_lcomp_path = NULL;
		char *orig_lcomp_stream = NULL;
		bool ok = true;

		/*
		 * Split off the last component of the processed
		 * destination name. We will compare this to
		 * the split components of dst_original_lcomp.
		 */
		if (!parent_dirname(ctx,
				smb_fname_dst->base_name,
				&fname_dst_parent,
				&fname_dst_lcomp)) {
			status = NT_STATUS_NO_MEMORY;
			goto out;
		}

		/*
		 * The dst_original_lcomp component contains
		 * the last_component of the path + stream
		 * name (if a stream exists).
		 *
		 * Split off the stream name so we
		 * can check them separately.
		 */

		if (fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES) {
			/* POSIX - no stream component. */
			orig_lcomp_path = talloc_strdup(ctx,
						dst_original_lcomp);
			if (orig_lcomp_path == NULL) {
				ok = false;
			}
		} else {
			ok = split_stream_filename(ctx,
					dst_original_lcomp,
					&orig_lcomp_path,
					&orig_lcomp_stream);
		}

		if (!ok) {
			TALLOC_FREE(fname_dst_parent);
			status = NT_STATUS_NO_MEMORY;
			goto out;
		}

		/* If the base names only differ by case, use original. */
		if(!strcsequal(fname_dst_lcomp, orig_lcomp_path)) {
			char *tmp;
			/*
			 * Replace the modified last component with the
			 * original.
			 */
			if (!ISDOT(fname_dst_parent)) {
				tmp = talloc_asprintf(smb_fname_dst,
					"%s/%s",
					fname_dst_parent,
					orig_lcomp_path);
			} else {
				tmp = talloc_strdup(smb_fname_dst,
					orig_lcomp_path);
			}
			if (tmp == NULL) {
				status = NT_STATUS_NO_MEMORY;
				TALLOC_FREE(fname_dst_parent);
				TALLOC_FREE(orig_lcomp_path);
				TALLOC_FREE(orig_lcomp_stream);
				goto out;
			}
			TALLOC_FREE(smb_fname_dst->base_name);
			smb_fname_dst->base_name = tmp;
		}

		/* If the stream_names only differ by case, use original. */
		if(!strcsequal(smb_fname_dst->stream_name,
			       orig_lcomp_stream)) {
			/* Use the original stream. */
			char *tmp = talloc_strdup(smb_fname_dst,
					    orig_lcomp_stream);
			if (tmp == NULL) {
				status = NT_STATUS_NO_MEMORY;
				TALLOC_FREE(fname_dst_parent);
				TALLOC_FREE(orig_lcomp_path);
				TALLOC_FREE(orig_lcomp_stream);
				goto out;
			}
			TALLOC_FREE(smb_fname_dst->stream_name);
			smb_fname_dst->stream_name = tmp;
		}
		TALLOC_FREE(fname_dst_parent);
		TALLOC_FREE(orig_lcomp_path);
		TALLOC_FREE(orig_lcomp_stream);
	}

	/*
	 * If the src and dest names are identical - including case,
	 * don't do the rename, just return success.
	 */

	if (strcsequal(fsp->fsp_name->base_name, smb_fname_dst->base_name) &&
	    strcsequal(fsp->fsp_name->stream_name,
		       smb_fname_dst->stream_name)) {
		DEBUG(3, ("rename_internals_fsp: identical names in rename %s "
			  "- returning success\n",
			  smb_fname_str_dbg(smb_fname_dst)));
		status = NT_STATUS_OK;
		goto out;
	}

	old_is_stream = is_ntfs_stream_smb_fname(fsp->fsp_name);
	new_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);

	/* Return the correct error code if both names aren't streams. */
	if (!old_is_stream && new_is_stream) {
		status = NT_STATUS_OBJECT_NAME_INVALID;
		goto out;
	}

	if (old_is_stream && !new_is_stream) {
		status = NT_STATUS_INVALID_PARAMETER;
		goto out;
	}

	dst_exists = vfs_stat(conn, smb_fname_dst) == 0;

	if(!replace_if_exists && dst_exists) {
		DEBUG(3, ("rename_internals_fsp: dest exists doing rename "
			  "%s -> %s\n", smb_fname_str_dbg(fsp->fsp_name),
			  smb_fname_str_dbg(smb_fname_dst)));
		status = NT_STATUS_OBJECT_NAME_COLLISION;
		goto out;
	}

	/*
	 * Drop the pathref fsp on the destination otherwise we trip upon in in
	 * the below check for open files check.
	 */
	if (smb_fname_dst_in->fsp != NULL) {
		fd_close(smb_fname_dst_in->fsp);
		file_free(NULL, smb_fname_dst_in->fsp);
		SMB_ASSERT(smb_fname_dst_in->fsp == NULL);
	}

	if (dst_exists) {
		struct file_id fileid = vfs_file_id_from_sbuf(conn,
		    &smb_fname_dst->st);
		files_struct *dst_fsp = file_find_di_first(conn->sconn,
							   fileid, true);
		/* The file can be open when renaming a stream */
		if (dst_fsp && !new_is_stream) {
			DEBUG(3, ("rename_internals_fsp: Target file open\n"));
			status = NT_STATUS_ACCESS_DENIED;
			goto out;
		}
	}

	/* Ensure we have a valid stat struct for the source. */
	status = vfs_stat_fsp(fsp);
	if (!NT_STATUS_IS_OK(status)) {
		goto out;
	}

	status = can_rename(conn, fsp, attrs);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(3, ("rename_internals_fsp: Error %s rename %s -> %s\n",
			  nt_errstr(status), smb_fname_str_dbg(fsp->fsp_name),
			  smb_fname_str_dbg(smb_fname_dst)));
		if (NT_STATUS_EQUAL(status,NT_STATUS_SHARING_VIOLATION))
			status = NT_STATUS_ACCESS_DENIED;
		goto out;
	}

	if (rename_path_prefix_equal(fsp->fsp_name, smb_fname_dst)) {
		status = NT_STATUS_ACCESS_DENIED;
		goto out;
	}

	/* Do we have rights to move into the destination ? */
	if (S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
		/* We're moving a directory. */
		access_mask = SEC_DIR_ADD_SUBDIR;
	}

	/*
	 * Get a pathref on the destination parent directory, so
	 * we can call check_parent_access_fsp().
	 */
	status = parent_pathref(ctx,
				conn->cwd_fsp,
				smb_fname_dst,
				&parent_dir_fname_dst,
				&parent_dir_fname_dst_atname);
	if (!NT_STATUS_IS_OK(status)) {
		goto out;
	}

	status = check_parent_access_fsp(parent_dir_fname_dst->fsp,
				access_mask);
	if (!NT_STATUS_IS_OK(status)) {
		DBG_INFO("check_parent_access_fsp on "
			"dst %s returned %s\n",
			smb_fname_str_dbg(smb_fname_dst),
			nt_errstr(status));
		goto out;
	}

	/*
	 * If the target existed, make sure the destination
	 * atname has the same stat struct.
	 */
	parent_dir_fname_dst_atname->st = smb_fname_dst->st;

	/*
	 * It's very common that source and
	 * destination directories are the same.
	 * Optimize by not opening the
	 * second parent_pathref if we know
	 * this is the case.
	 */

	status = SMB_VFS_PARENT_PATHNAME(conn,
					 ctx,
					 fsp->fsp_name,
					 &parent_dir_fname_src,
					 &parent_dir_fname_src_atname);
	if (!NT_STATUS_IS_OK(status)) {
		goto out;
	}

	/*
	 * We do a case-sensitive string comparison. We want to be *sure*
	 * this is the same path. The worst that can happen if
	 * the case doesn't match is we lose out on the optimization,
	 * the code still works.
	 *
	 * We can ignore twrp fields here. Rename is not allowed on
	 * shadow copy handles.
	 */

	if (strcmp(parent_dir_fname_src->base_name,
		   parent_dir_fname_dst->base_name) == 0) {
		/*
		 * parent directory is the same for source
		 * and destination.
		 */
		/* Reparent the src_atname to the parent_dir_dest fname. */
		parent_dir_fname_src_atname = talloc_move(
						parent_dir_fname_dst,
						&parent_dir_fname_src_atname);
		/* Free the unneeded duplicate parent name. */
		TALLOC_FREE(parent_dir_fname_src);
		/*
		 * And make the source parent name a copy of the
		 * destination parent name.
		 */
		parent_dir_fname_src = parent_dir_fname_dst;
	} else {
		/*
		 * source and destination parent directories are
		 * different.
		 *
		 * Get a pathref on the source parent directory, so
		 * we can do a relative rename.
		 */
		TALLOC_FREE(parent_dir_fname_src);
		status = parent_pathref(ctx,
				conn->cwd_fsp,
				fsp->fsp_name,
				&parent_dir_fname_src,
				&parent_dir_fname_src_atname);
		if (!NT_STATUS_IS_OK(status)) {
			goto out;
		}
	}

	/*
	 * Some modules depend on the source smb_fname having a valid stat.
	 * The parent_dir_fname_src_atname is the relative name of the
	 * currently open file, so just copy the stat from the open fsp.
	 */
	parent_dir_fname_src_atname->st = fsp->fsp_name->st;

	lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);

	/*
	 * We have the file open ourselves, so not being able to get the
	 * corresponding share mode lock is a fatal error.
	 */

	SMB_ASSERT(lck != NULL);

	ret = SMB_VFS_RENAMEAT(conn,
			parent_dir_fname_src->fsp,
			parent_dir_fname_src_atname,
			parent_dir_fname_dst->fsp,
			parent_dir_fname_dst_atname);
	if (ret == 0) {
		uint32_t create_options = fh_get_private_options(fsp->fh);

		DEBUG(3, ("rename_internals_fsp: succeeded doing rename on "
			  "%s -> %s\n", smb_fname_str_dbg(fsp->fsp_name),
			  smb_fname_str_dbg(smb_fname_dst)));

		notify_rename(conn,
			      fsp->fsp_flags.is_directory,
			      fsp->fsp_name,
			      smb_fname_dst);

		rename_open_files(conn, lck, fsp->file_id, fsp->name_hash,
				  smb_fname_dst);

		if (!fsp->fsp_flags.is_directory &&
		    !(fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES) &&
		    (lp_map_archive(SNUM(conn)) ||
		     lp_store_dos_attributes(SNUM(conn))))
		{
			/*
			 * We must set the archive bit on the newly renamed
			 * file.
			 */
			status = vfs_stat_fsp(fsp);
			if (NT_STATUS_IS_OK(status)) {
				uint32_t old_dosmode;
				old_dosmode = fdos_mode(fsp);
				/*
				 * We can use fsp->fsp_name here as it has
				 * already been changed to the new name.
				 */
				SMB_ASSERT(fsp->fsp_name->fsp == fsp);
				file_set_dosmode(conn,
						fsp->fsp_name,
						old_dosmode | FILE_ATTRIBUTE_ARCHIVE,
						NULL,
						true);
			}
		}

		/*
		 * A rename acts as a new file create w.r.t. allowing an initial delete
		 * on close, probably because in Windows there is a new handle to the
		 * new file. If initial delete on close was requested but not
		 * originally set, we need to set it here. This is probably not 100% correct,
		 * but will work for the CIFSFS client which in non-posix mode
		 * depends on these semantics. JRA.
		 */

		if (create_options & FILE_DELETE_ON_CLOSE) {
			status = can_set_delete_on_close(fsp, 0);

			if (NT_STATUS_IS_OK(status)) {
				/* Note that here we set the *initial* delete on close flag,
				 * not the regular one. The magic gets handled in close. */
				fsp->fsp_flags.initial_delete_on_close = true;
			}
		}
		TALLOC_FREE(lck);
		status = NT_STATUS_OK;
		goto out;
	}

	TALLOC_FREE(lck);

	if (errno == ENOTDIR || errno == EISDIR) {
		status = NT_STATUS_OBJECT_NAME_COLLISION;
	} else {
		status = map_nt_error_from_unix(errno);
	}

	DEBUG(3, ("rename_internals_fsp: Error %s rename %s -> %s\n",
		  nt_errstr(status), smb_fname_str_dbg(fsp->fsp_name),
		  smb_fname_str_dbg(smb_fname_dst)));

 out:

	/*
	 * parent_dir_fname_src may be a copy of parent_dir_fname_dst.
	 * See the optimization for same source and destination directory
	 * above. Only free one in that case.
	 */
	if (parent_dir_fname_src != parent_dir_fname_dst) {
		TALLOC_FREE(parent_dir_fname_src);
	}
	TALLOC_FREE(parent_dir_fname_dst);
	TALLOC_FREE(smb_fname_dst);

	return status;
}