NetBSD/usr.sbin/rpc.yppasswdd/rpc.yppasswdd.c

/*	$NetBSD: rpc.yppasswdd.c,v 1.18 2017/05/04 16:26:09 sevan Exp $	*/

/*
 * Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
__RCSID("$NetBSD: rpc.yppasswdd.c,v 1.18 2017/05/04 16:26:09 sevan Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <sys/wait.h>

#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <util.h>

#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpcsvc/yppasswd.h>

#include "extern.h"

int	noshell, nogecos, nopw;
char	make_arg[_POSIX2_LINE_MAX] = "make";

void	yppasswddprog_1(struct svc_req *, SVCXPRT *);
__dead static void	usage(void);

int
main(int argc, char *argv[])
{
	SVCXPRT *transp;
	int i;
	char *arg;
	int maxrec = RPC_MAXDATASIZE;

	for (i = 1; i < argc; i++) {
		arg = argv[i];
		if (*arg++ != '-')
			usage();
		if (strcmp("d", arg) == 0)
			if (++i == argc)
				usage();
			else {
				if (pw_setprefix(argv[i]) < 0)
					err(EXIT_FAILURE,NULL);
			}
		else if (strcmp("noshell", arg) == 0)
			noshell = 1;
		else if (strcmp("nogecos", arg) == 0)
			nogecos = 1;
		else if (strcmp("nopw", arg) == 0)
			nopw = 1;
		else if (strcmp("m", arg) == 0) {
			int len;

			len = strlen(make_arg);
			if (++i == argc)
				usage();
			for (; i < argc; i++) {
				int arglen;

				arglen = strlen(argv[i]);
				if ((len + arglen) > (int)(sizeof(make_arg) - 2))
					errx(EXIT_FAILURE, "%s", strerror(E2BIG));
				make_arg[len++] = ' ';
				(void)strcpy(&make_arg[len], argv[i]);
				len += arglen;
			}
		} else
			usage();
	}

	if (daemon(0, 0))
		err(EXIT_FAILURE, "can't detach");
	pidfile(NULL);

	rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);

	(void)pmap_unset(YPPASSWDPROG, YPPASSWDVERS);

	transp = svcudp_create(RPC_ANYSOCK);
	if (transp == NULL)
		errx(EXIT_FAILURE, "cannot create UDP service");

	if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswddprog_1,
	    IPPROTO_UDP))
		errx(EXIT_FAILURE,
		    "unable to register YPPASSWDPROG/YPPASSWDVERS/UDP");

	transp = svctcp_create(RPC_ANYSOCK, RPC_MAXDATASIZE, RPC_MAXDATASIZE);
	if (transp == NULL)
		errx(EXIT_FAILURE, "cannot create TCP service");

	if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswddprog_1,
	    IPPROTO_TCP))
		errx(EXIT_FAILURE,
		    "unable to register YPPASSWDPROG/YPPASSWDVERS/TCP");

	svc_run();
	errx(EXIT_FAILURE, "svc_run returned");
	/* NOTREACHED */
}

void
yppasswddprog_1(struct svc_req *rqstp, SVCXPRT *transp)
{
	union {
		yppasswd yppasswdproc_update_1_arg;
	} argument;

	switch (rqstp->rq_proc) {
	case NULLPROC:
		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
		return;

	case YPPASSWDPROC_UPDATE:
		/*
		 * We'd like this to look like a regular RPC
		 * stub, but we have to send the reply in the
		 * handler in order to avoid both signal race
		 * conditions locally and timeouts on the
		 * client.
		 */
		(void)memset(&argument, 0, sizeof(argument));
		if (!svc_getargs(transp, xdr_yppasswd, (caddr_t) & argument)) {
			svcerr_decode(transp);
			return;
		}
		make_passwd((yppasswd *)&argument, rqstp, transp);
		if (!svc_freeargs(transp, xdr_yppasswd, (caddr_t) &argument))
			errx(EXIT_FAILURE, "unable to free arguments");
		return;
	}

	svcerr_noproc(transp);
}

void
usage(void)
{

	fprintf(stderr, "usage: %s [-d directory] [-noshell] [-nogecos] "
	    "[-nopw] [-m arg1 [arg2 ...]]\n", getprogname());
	exit(EXIT_FAILURE);
}