/*      $NetBSD: pw_yp.c,v 1.23 2015/06/17 00:01:59 christos Exp $      */

/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)pw_yp.c     1.0 2/2/93";
#else
__RCSID("$NetBSD: pw_yp.c,v 1.23 2015/06/17 00:01:59 christos Exp $");
#endif
#endif /* not lint */

#ifdef  YP

#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>

#define passwd yp_passwd_rec
#include <rpcsvc/yppasswd.h>
#undef passwd

#include "chpass.h"

static char *domain;

/*
 * Check if rpc.yppasswdd is running on the master YP server.
 * XXX this duplicates some code, but is much less complex
 * than the alternative.
 */
int
check_yppasswdd(void)
{
        char *master;
        int rpcport;

        /*
         * Get local domain
         */
        if (!domain && yp_get_default_domain(&domain) != 0)
                return (1);

        /*
         * Find the host for the passwd map; it should be running
         * the daemon.
         */
        master = NULL;
        if (yp_master(domain, "passwd.byname", &master) != 0) {
                if (master != NULL)
                        free (master);
                return (1);
        }

        /*
         * Ask the portmapper for the port of the daemon.
         */
        if ((rpcport = getrpcport(master, YPPASSWDPROG, YPPASSWDPROC_UPDATE,
            IPPROTO_UDP)) == 0)
                return (1);

        /*
         * Successful contact with rpc.yppasswdd.
         */
        return (0);
}

int
pw_yp(struct passwd *pw, uid_t ypuid)
{
        char *master;
        int r, rpcport, status;
        struct yppasswd yppw;
        struct timeval tv;
        CLIENT *client;
        
        /*
         * Get local domain
         */
        if (!domain && (r = yp_get_default_domain(&domain)))
                errx(1, "can't get local YP domain.  Reason: %s",
                    yperr_string(r));

        /*
         * Find the host for the passwd map; it should be running
         * the daemon.
         */
        master = NULL;
        if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
                if (master)
                        free (master);
                warnx("can't find the master YP server.  Reason: %s",
                    yperr_string(r));
                return (1);
        }

        /*
         * Ask the portmapper for the port of the daemon.
         */
        if ((rpcport = getrpcport(master, YPPASSWDPROG, YPPASSWDPROC_UPDATE,
            IPPROTO_UDP)) == 0) {
                warnx("master YP server not running yppasswd daemon.\n\t%s",
                    "Can't change password.");
                return (1);
        }

        /*
         * Be sure the port is privileged
         */
        if (rpcport >= IPPORT_RESERVED) {
                warnx("yppasswd daemon is on an invalid port.");
                return (1);
        }

        /* prompt for old password */
        memset(&yppw, 0, sizeof yppw);
        yppw.oldpass = getpass("Old password:");
        if (!yppw.oldpass) {
                warnx("Cancelled.");
                return (1);
        }

        /* tell rpc.yppasswdd */
        yppw.newpw.pw_name       = strdup(pw->pw_name);
        if (!yppw.newpw.pw_name) {
                err(1, "strdup");
                /*NOTREACHED*/
        }
        yppw.newpw.pw_passwd = strdup(pw->pw_passwd);
        if (!yppw.newpw.pw_passwd) {
                err(1, "strdup");
                /*NOTREACHED*/
        }
        yppw.newpw.pw_uid        = pw->pw_uid;
        yppw.newpw.pw_gid        = pw->pw_gid;
        yppw.newpw.pw_gecos      = strdup(pw->pw_gecos);
        if (!yppw.newpw.pw_gecos) {
                err(1, "strdup");
                /*NOTREACHED*/
        }
        yppw.newpw.pw_dir        = strdup(pw->pw_dir);
        if (!yppw.newpw.pw_dir) {
                err(1, "strdup");
                /*NOTREACHED*/
        }
        yppw.newpw.pw_shell      = strdup(pw->pw_shell);
        if (!yppw.newpw.pw_shell) {
                err(1, "strdup");
                /*NOTREACHED*/
        }
        
        client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
        if (client == NULL) {
                warnx("cannot contact yppasswdd on %s:  Reason: %s",
                    master, yperr_string(YPERR_YPBIND));
                return (1);
        }
        client->cl_auth = authunix_create_default();
        tv.tv_sec = 5;
        tv.tv_usec = 0;
        r = clnt_call(client, YPPASSWDPROC_UPDATE,
            xdr_yppasswd, &yppw, xdr_int, &status, tv);
        if (r) {
                warnx("rpc to yppasswdd failed.");
                return (1);
        } else if (status)
                printf("Couldn't change YP password.\n");
        else
                printf("%s %s, %s\n",
                    "The YP password information has been changed on",
                    master, "the master YP passwd server.");
        return (0);
}

void
yppw_error(const char *name, int yperr, int eval)
{

        if (yperr) {
                if (name)
                        warn("%s", name);
                else
                        warn(NULL);
        }

        errx(eval, "YP passwd information unchanged");
}

void
yppw_prompt(void)
{
        int c;

        (void)printf("re-edit the password file? [y]: ");
        (void)fflush(stdout);
        c = getchar();
        if (c != EOF && c != '\n')
                while (getchar() != '\n');
        if (c == 'n')
                yppw_error(NULL, 0, 0);
}
#endif  /* YP */