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use users-groups-by-id@openssh.com sftp-server extension (when
available) to fill in user/group names for directory listings.
Implement a client-side cache of see uid/gid=>user/group names.
ok markus@

/*
 * Copyright (c) 2022 Damien Miller <djm@mindrot.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.
 */

/* sftp client user/group lookup and caching */

/* Lookup uids/gids and populate cache */
void get_remote_user_groups_from_glob(struct sftp_conn *conn, glob_t *g);
void get_remote_user_groups_from_dirents(struct sftp_conn *conn, SFTP_DIRENT **d);

/* Return user/group name from cache or NULL if not found */
const char *ruser_name(uid_t uid);
const char *rgroup_name(uid_t gid);