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/usr/include/rpcsvc/yppasswd.x is in libc6-dev 2.23-0ubuntu10.

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/* @(#)yppasswd.x	2.1 88/08/01 4.0 RPCSRC */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * YP password update protocol
 * Requires unix authentication
 */
program YPPASSWDPROG {
	version YPPASSWDVERS {
		/*
		 * Update my passwd entry
		 */
		int
		YPPASSWDPROC_UPDATE(yppasswd) = 1;
	} = 1;
} = 100009;


struct passwd {
	string pw_name<>;	/* username */
	string pw_passwd<>;	/* encrypted password */
	int pw_uid;		/* user id */
	int pw_gid;		/* group id */
	string pw_gecos<>;	/* in real life name */
	string pw_dir<>;	/* home directory */
	string pw_shell<>;	/* default shell */
};

struct yppasswd {
	string oldpass<>;	/* unencrypted old password */
	passwd newpw;		/* new passwd entry */
};