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Add "-h" flag to sftp chown/chgrp/chmod commands to request they do
not follow symlinks. Requires recently-committed lsetstat@openssh.com
extension on the server side.

ok markus@ dtucker@

/* $OpenBSD: sftp-client.h,v 1.28 2019/01/16 23:23:45 djm Exp $ */

/*
 * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* Client side of SSH2 filexfer protocol */

#ifndef _SFTP_CLIENT_H
#define _SFTP_CLIENT_H

typedef struct SFTP_DIRENT SFTP_DIRENT;

struct SFTP_DIRENT {
	char *filename;
	char *longname;
	Attrib a;
};

/*
 * Used for statvfs responses on the wire from the server, because the
 * server's native format may be larger than the client's.
 */
struct sftp_statvfs {
	u_int64_t f_bsize;
	u_int64_t f_frsize;
	u_int64_t f_blocks;
	u_int64_t f_bfree;
	u_int64_t f_bavail;
	u_int64_t f_files;
	u_int64_t f_ffree;
	u_int64_t f_favail;
	u_int64_t f_fsid;
	u_int64_t f_flag;
	u_int64_t f_namemax;
};

/*
 * Initialise a SSH filexfer connection. Returns NULL on error or
 * a pointer to a initialized sftp_conn struct on success.
 */
struct sftp_conn *do_init(int, int, u_int, u_int, u_int64_t);

u_int sftp_proto_version(struct sftp_conn *);

/* Close file referred to by 'handle' */
int do_close(struct sftp_conn *, const u_char *, u_int);

/* Read contents of 'path' to NULL-terminated array 'dir' */
int do_readdir(struct sftp_conn *, const char *, SFTP_DIRENT ***);

/* Frees a NULL-terminated array of SFTP_DIRENTs (eg. from do_readdir) */
void free_sftp_dirents(SFTP_DIRENT **);

/* Delete file 'path' */
int do_rm(struct sftp_conn *, const char *);

/* Create directory 'path' */
int do_mkdir(struct sftp_conn *, const char *, Attrib *, int);

/* Remove directory 'path' */
int do_rmdir(struct sftp_conn *, const char *);

/* Get file attributes of 'path' (follows symlinks) */
Attrib *do_stat(struct sftp_conn *, const char *, int);

/* Get file attributes of 'path' (does not follow symlinks) */
Attrib *do_lstat(struct sftp_conn *, const char *, int);

/* Set file attributes of 'path' */
int do_setstat(struct sftp_conn *, const char *, Attrib *);

/* Set file attributes of open file 'handle' */
int do_fsetstat(struct sftp_conn *, const u_char *, u_int, Attrib *);

/* Set file attributes of 'path', not following symlinks */
int do_lsetstat(struct sftp_conn *conn, const char *path, Attrib *a);

/* Canonicalise 'path' - caller must free result */
char *do_realpath(struct sftp_conn *, const char *);

/* Get statistics for filesystem hosting file at "path" */
int do_statvfs(struct sftp_conn *, const char *, struct sftp_statvfs *, int);

/* Rename 'oldpath' to 'newpath' */
int do_rename(struct sftp_conn *, const char *, const char *, int force_legacy);

/* Link 'oldpath' to 'newpath' */
int do_hardlink(struct sftp_conn *, const char *, const char *);

/* Rename 'oldpath' to 'newpath' */
int do_symlink(struct sftp_conn *, const char *, const char *);

/* Call fsync() on open file 'handle' */
int do_fsync(struct sftp_conn *conn, u_char *, u_int);

/*
 * Download 'remote_path' to 'local_path'. Preserve permissions and times
 * if 'pflag' is set
 */
int do_download(struct sftp_conn *, const char *, const char *,
    Attrib *, int, int, int);

/*
 * Recursively download 'remote_directory' to 'local_directory'. Preserve
 * times if 'pflag' is set
 */
int download_dir(struct sftp_conn *, const char *, const char *,
    Attrib *, int, int, int, int);

/*
 * Upload 'local_path' to 'remote_path'. Preserve permissions and times
 * if 'pflag' is set
 */
int do_upload(struct sftp_conn *, const char *, const char *, int, int, int);

/*
 * Recursively upload 'local_directory' to 'remote_directory'. Preserve
 * times if 'pflag' is set
 */
int upload_dir(struct sftp_conn *, const char *, const char *, int, int, int,
    int);

/* Concatenate paths, taking care of slashes. Caller must free result. */
char *path_append(const char *, const char *);

#endif