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      1 /*	$NetBSD: rpc.yppasswdd.c,v 1.18 2017/05/04 16:26:09 sevan Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Mats O Jansson <moj (at) stacken.kth.se>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #ifndef lint
     31 __RCSID("$NetBSD: rpc.yppasswdd.c,v 1.18 2017/05/04 16:26:09 sevan Exp $");
     32 #endif /* not lint */
     33 
     34 #include <sys/types.h>
     35 #include <sys/wait.h>
     36 
     37 #include <err.h>
     38 #include <errno.h>
     39 #include <limits.h>
     40 #include <stdio.h>
     41 #include <stdlib.h>
     42 #include <string.h>
     43 #include <signal.h>
     44 #include <unistd.h>
     45 #include <util.h>
     46 
     47 #include <rpc/rpc.h>
     48 #include <rpc/pmap_clnt.h>
     49 #include <rpcsvc/yppasswd.h>
     50 
     51 #include "extern.h"
     52 
     53 int	noshell, nogecos, nopw;
     54 char	make_arg[_POSIX2_LINE_MAX] = "make";
     55 
     56 void	yppasswddprog_1(struct svc_req *, SVCXPRT *);
     57 __dead static void	usage(void);
     58 
     59 int
     60 main(int argc, char *argv[])
     61 {
     62 	SVCXPRT *transp;
     63 	int i;
     64 	char *arg;
     65 	int maxrec = RPC_MAXDATASIZE;
     66 
     67 	for (i = 1; i < argc; i++) {
     68 		arg = argv[i];
     69 		if (*arg++ != '-')
     70 			usage();
     71 		if (strcmp("d", arg) == 0)
     72 			if (++i == argc)
     73 				usage();
     74 			else {
     75 				if (pw_setprefix(argv[i]) < 0)
     76 					err(EXIT_FAILURE,NULL);
     77 			}
     78 		else if (strcmp("noshell", arg) == 0)
     79 			noshell = 1;
     80 		else if (strcmp("nogecos", arg) == 0)
     81 			nogecos = 1;
     82 		else if (strcmp("nopw", arg) == 0)
     83 			nopw = 1;
     84 		else if (strcmp("m", arg) == 0) {
     85 			int len;
     86 
     87 			len = strlen(make_arg);
     88 			if (++i == argc)
     89 				usage();
     90 			for (; i < argc; i++) {
     91 				int arglen;
     92 
     93 				arglen = strlen(argv[i]);
     94 				if ((len + arglen) > (int)(sizeof(make_arg) - 2))
     95 					errx(EXIT_FAILURE, "%s", strerror(E2BIG));
     96 				make_arg[len++] = ' ';
     97 				(void)strcpy(&make_arg[len], argv[i]);
     98 				len += arglen;
     99 			}
    100 		} else
    101 			usage();
    102 	}
    103 
    104 	if (daemon(0, 0))
    105 		err(EXIT_FAILURE, "can't detach");
    106 	pidfile(NULL);
    107 
    108 	rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
    109 
    110 	(void)pmap_unset(YPPASSWDPROG, YPPASSWDVERS);
    111 
    112 	transp = svcudp_create(RPC_ANYSOCK);
    113 	if (transp == NULL)
    114 		errx(EXIT_FAILURE, "cannot create UDP service");
    115 
    116 	if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswddprog_1,
    117 	    IPPROTO_UDP))
    118 		errx(EXIT_FAILURE,
    119 		    "unable to register YPPASSWDPROG/YPPASSWDVERS/UDP");
    120 
    121 	transp = svctcp_create(RPC_ANYSOCK, RPC_MAXDATASIZE, RPC_MAXDATASIZE);
    122 	if (transp == NULL)
    123 		errx(EXIT_FAILURE, "cannot create TCP service");
    124 
    125 	if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswddprog_1,
    126 	    IPPROTO_TCP))
    127 		errx(EXIT_FAILURE,
    128 		    "unable to register YPPASSWDPROG/YPPASSWDVERS/TCP");
    129 
    130 	svc_run();
    131 	errx(EXIT_FAILURE, "svc_run returned");
    132 	/* NOTREACHED */
    133 }
    134 
    135 void
    136 yppasswddprog_1(struct svc_req *rqstp, SVCXPRT *transp)
    137 {
    138 	union {
    139 		yppasswd yppasswdproc_update_1_arg;
    140 	} argument;
    141 
    142 	switch (rqstp->rq_proc) {
    143 	case NULLPROC:
    144 		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
    145 		return;
    146 
    147 	case YPPASSWDPROC_UPDATE:
    148 		/*
    149 		 * We'd like this to look like a regular RPC
    150 		 * stub, but we have to send the reply in the
    151 		 * handler in order to avoid both signal race
    152 		 * conditions locally and timeouts on the
    153 		 * client.
    154 		 */
    155 		(void)memset(&argument, 0, sizeof(argument));
    156 		if (!svc_getargs(transp, xdr_yppasswd, (caddr_t) & argument)) {
    157 			svcerr_decode(transp);
    158 			return;
    159 		}
    160 		make_passwd((yppasswd *)&argument, rqstp, transp);
    161 		if (!svc_freeargs(transp, xdr_yppasswd, (caddr_t) &argument))
    162 			errx(EXIT_FAILURE, "unable to free arguments");
    163 		return;
    164 	}
    165 
    166 	svcerr_noproc(transp);
    167 }
    168 
    169 void
    170 usage(void)
    171 {
    172 
    173 	fprintf(stderr, "usage: %s [-d directory] [-noshell] [-nogecos] "
    174 	    "[-nopw] [-m arg1 [arg2 ...]]\n", getprogname());
    175 	exit(EXIT_FAILURE);
    176 }
    177