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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/portmap/portmap.c	Lines:	0	283	0.0 %
Date:	2017-11-07	Branches:	0	177	0.0 %


/*	$OpenBSD: portmap.c,v 1.48 2015/10/14 13:32:44 jsg Exp $	*/

/*-
 * Copyright (c) 1996, 1997 Theo de Raadt (OpenBSD). All rights reserved.
 * Copyright (c) 1990 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.
 */
/*
 * 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.
 */

/*
 * portmap.c, Implements the program,version to port number mapping for
 * rpc.
 */

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

#include <rpcsvc/nfs_prot.h>
#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>

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

void reg_service(struct svc_req *, SVCXPRT *);
void reap(int);
void callit(struct svc_req *, SVCXPRT *);
int check_callit(struct sockaddr_in *, u_long, u_long);
struct pmaplist *find_service(u_long, u_long, u_long);

struct pmaplist *pmaplist;
int debugging;

SVCXPRT *ludpxprt, *ltcpxprt;

int
main(int argc, char *argv[])
{
	int sock, lsock, c, on = 1;
	socklen_t len = sizeof(struct sockaddr_in);
	struct sockaddr_in addr, laddr;
	struct pmaplist *pml;
	struct passwd *pw;
	SVCXPRT *xprt;

	while ((c = getopt(argc, argv, "d")) != -1) {
		switch (c) {
		case 'd':
			debugging = 1;
			break;
		default:
			(void)fprintf(stderr, "usage: %s [-d]\n", argv[0]);
			exit(1);
		}
	}

	if (!debugging && daemon(0, 0)) {
		(void)fprintf(stderr, "portmap: fork: %s", strerror(errno));
		exit(1);
	}

	openlog("portmap", LOG_NDELAY | (debugging ? LOG_PID | LOG_PERROR :
	    LOG_PID), LOG_DAEMON);

	bzero(&addr, sizeof addr);
	addr.sin_addr.s_addr = 0;
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_ANY);
	addr.sin_port = htons(PMAPPORT);

	bzero(&laddr, sizeof laddr);
	laddr.sin_addr.s_addr = 0;
	laddr.sin_family = AF_INET;
	laddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	laddr.sin_port = htons(PMAPPORT);

	if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
		syslog(LOG_ERR, "cannot create udp socket: %m");
		exit(1);
	}
	setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
	if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
		syslog(LOG_ERR, "cannot bind udp: %m");
		exit(1);
	}

	if ((xprt = svcudp_create(sock)) == NULL) {
		syslog(LOG_ERR, "couldn't do udp_create");
		exit(1);
	}

	if ((lsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
		syslog(LOG_ERR, "cannot create udp socket: %m");
		exit(1);
	}
	setsockopt(lsock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
	if (bind(lsock, (struct sockaddr *)&laddr, len) != 0) {
		syslog(LOG_ERR, "cannot bind local udp: %m");
		exit(1);
	}

	if ((ludpxprt = svcudp_create(lsock)) == NULL) {
		syslog(LOG_ERR, "couldn't do udp_create");
		exit(1);
	}

	/* make an entry for ourself */
	pml = malloc(sizeof(struct pmaplist));
	if (pml == NULL) {
		syslog(LOG_ERR, "out of memory");
		exit(1);
	}
	pml->pml_next = 0;
	pml->pml_map.pm_prog = PMAPPROG;
	pml->pml_map.pm_vers = PMAPVERS;
	pml->pml_map.pm_prot = IPPROTO_UDP;
	pml->pml_map.pm_port = PMAPPORT;
	pmaplist = pml;

	if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
		syslog(LOG_ERR, "cannot create tcp socket: %m");
		exit(1);
	}
	setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
	if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
		syslog(LOG_ERR, "cannot bind tcp: %m");
		exit(1);
	}
	if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE)) ==
	    NULL) {
		syslog(LOG_ERR, "couldn't do tcp_create");
		exit(1);
	}

	if ((lsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
		syslog(LOG_ERR, "cannot create tcp socket: %m");
		exit(1);
	}
	setsockopt(lsock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
	if (bind(lsock, (struct sockaddr *)&laddr, len) != 0) {
		syslog(LOG_ERR, "cannot bind tcp: %m");
		exit(1);
	}
	if ((ltcpxprt = svctcp_create(lsock, RPCSMALLMSGSIZE,
	    RPCSMALLMSGSIZE)) == NULL) {
		syslog(LOG_ERR, "couldn't do tcp_create");
		exit(1);
	}

	/* make an entry for ourself */
	pml = malloc(sizeof(struct pmaplist));
	if (pml == NULL) {
		syslog(LOG_ERR, "out of memory");
		exit(1);
	}
	pml->pml_map.pm_prog = PMAPPROG;
	pml->pml_map.pm_vers = PMAPVERS;
	pml->pml_map.pm_prot = IPPROTO_TCP;
	pml->pml_map.pm_port = PMAPPORT;
	pml->pml_next = pmaplist;
	pmaplist = pml;

	if ((pw = getpwnam("_portmap")) == NULL) {
		syslog(LOG_ERR, "no such user _portmap");
		exit(1);
	}
	if (chroot("/var/empty") == -1) {
		syslog(LOG_ERR, "cannot chroot to /var/empty.");
		exit(1);
	}
	if (chdir("/") == -1) {
		syslog(LOG_ERR, "cannot chdir to new /.");
		exit(1);
	}

	if (pw) {
		if (setgroups(1, &pw->pw_gid) == -1 ||
		    setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1 ||
		    setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) {
			syslog(LOG_ERR, "revoke privs: %s", strerror(errno));
			exit(1);
		}
	}
	endpwent();

	if (pledge("stdio rpath inet proc flock cpath wpath", NULL) == -1)
		err(1, "pledge");

	if (svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE) == 0) {
		syslog(LOG_ERR, "svc_register failed.");
		exit(1);
	}

	(void)signal(SIGCHLD, reap);
	svc_run();
	syslog(LOG_ERR, "svc_run returned unexpectedly");
	abort();
}

struct pmaplist *
find_service(u_long prog, u_long vers, u_long prot)
{
	struct pmaplist *hit = NULL;
	struct pmaplist *pml;

	for (pml = pmaplist; pml != NULL; pml = pml->pml_next) {
		if ((pml->pml_map.pm_prog != prog) ||
		    (pml->pml_map.pm_prot != prot))
			continue;
		hit = pml;
		if (pml->pml_map.pm_vers == vers)
			break;
	}
	return (hit);
}

/*
 * 1 OK, 0 not
 */
void
reg_service(struct svc_req *rqstp, SVCXPRT *xprt)
{
	struct pmap reg;
	struct pmaplist *pml, *prevpml, *fnd;
	struct sockaddr_in *fromsin;
	long ans = 0, port;
	void *t;

	fromsin = svc_getcaller(xprt);

	if (debugging)
		(void)fprintf(stderr, "server: about to do a switch\n");
	switch (rqstp->rq_proc) {
	case PMAPPROC_NULL:
		/*
		 * Null proc call
		 */
		if (!svc_sendreply(xprt, xdr_void, NULL) && debugging) {
			abort();
		}
		break;
	case PMAPPROC_SET:
		/*
		 * Set a program,version to port mapping
		 */
		if (xprt != ltcpxprt && xprt != ludpxprt) {
			syslog(LOG_WARNING,
			    "non-local set attempt (might be from %s)",
			    inet_ntoa(fromsin->sin_addr));
			svcerr_noproc(xprt);
			return;
		}
		if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg)) {
			svcerr_decode(xprt);
			break;
		}

		/*
		 * check to see if already used
		 * find_service returns a hit even if
		 * the versions don't match, so check for it
		 */
		fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
		if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) {
			if (fnd->pml_map.pm_port == reg.pm_port)
				ans = 1;
			goto done;
		}

		if (debugging)
			printf("set: prog %lu vers %lu port %lu\n",
			    reg.pm_prog, reg.pm_vers, reg.pm_port);

		if (reg.pm_port & ~0xffff)
			goto done;

		/*
		 * only permit localhost root to create
		 * mappings pointing at sensitive ports
		 */
		if ((reg.pm_port < IPPORT_RESERVED ||
		    reg.pm_port == NFS_PORT) &&
		    htons(fromsin->sin_port) >= IPPORT_RESERVED) {
			syslog(LOG_WARNING,
			    "resvport set attempt by non-root");
			goto done;
		}

		/*
		 * add to END of list
		 */
		pml = malloc(sizeof(struct pmaplist));
		if (pml == NULL) {
			syslog(LOG_ERR, "out of memory");
			svcerr_systemerr(xprt);
			return;
		}

		pml->pml_map = reg;
		pml->pml_next = 0;
		if (pmaplist == NULL) {
			pmaplist = pml;
		} else {
			for (fnd = pmaplist; fnd->pml_next != 0;
			    fnd = fnd->pml_next)
				;
			fnd->pml_next = pml;
		}
		ans = 1;
done:
		if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
		    debugging) {
			(void)fprintf(stderr, "svc_sendreply\n");
			abort();
		}
		break;
	case PMAPPROC_UNSET:
		/*
		 * Remove a program,version to port mapping.
		 */
		if (xprt != ltcpxprt && xprt != ludpxprt) {
			syslog(LOG_WARNING,
			    "non-local unset attempt (might be from %s)",
			    inet_ntoa(fromsin->sin_addr));
			svcerr_noproc(xprt);
			return;
		}
		if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg)) {
			svcerr_decode(xprt);
			break;
		}
		for (prevpml = NULL, pml = pmaplist; pml != NULL; ) {
			if ((pml->pml_map.pm_prog != reg.pm_prog) ||
			    (pml->pml_map.pm_vers != reg.pm_vers)) {
				/* both pml & prevpml move forwards */
				prevpml = pml;
				pml = pml->pml_next;
				continue;
			}
			if ((pml->pml_map.pm_port < IPPORT_RESERVED ||
			    pml->pml_map.pm_port == NFS_PORT) &&
			    htons(fromsin->sin_port) >= IPPORT_RESERVED) {
				syslog(LOG_WARNING,
				    "resvport unset attempt by non-root");
				break;
			}

			/* found it; pml moves forward, prevpml stays */
			ans = 1;
			t = pml;
			pml = pml->pml_next;
			if (prevpml == NULL)
				pmaplist = pml;
			else
				prevpml->pml_next = pml;
			free(t);
		}
		if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
		    debugging) {
			fprintf(stderr, "svc_sendreply\n");
			abort();
		}
		break;
	case PMAPPROC_GETPORT:
		/*
		 * Lookup the mapping for a program,version and return its port
		 */
		if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg)) {
			svcerr_decode(xprt);
			break;
		}
		fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
		if (fnd)
			port = fnd->pml_map.pm_port;
		else
			port = 0;
		if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) &&
		    debugging) {
			fprintf(stderr, "svc_sendreply\n");
			abort();
		}
		break;
	case PMAPPROC_DUMP:
		/*
		 * Return the current set of mapped program,version
		 */
		if (!svc_getargs(xprt, xdr_void, NULL)) {
			svcerr_decode(xprt);
			break;
		}
		if (!svc_sendreply(xprt, xdr_pmaplist, (caddr_t)&pmaplist) &&
		    debugging) {
			fprintf(stderr, "svc_sendreply\n");
			abort();
		}
		break;
	case PMAPPROC_CALLIT:
		/*
		 * Calls a procedure on the local machine.  If the requested
		 * procedure is not registered this procedure does not return
		 * error information!!
		 * This procedure is only supported on rpc/udp and calls via
		 * rpc/udp.  It passes null authentication parameters.
		 */
		callit(rqstp, xprt);
		break;
	default:
		svcerr_noproc(xprt);
		break;
	}
}


/*
 * Stuff for the rmtcall service
 */
#define ARGSIZE 9000

struct encap_parms {
	u_int arglen;
	char *args;
};

static bool_t
xdr_encap_parms(XDR *xdrs, struct encap_parms *epp)
{

	return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
}

struct rmtcallargs {
	u_long	rmt_prog;
	u_long	rmt_vers;
	u_long	rmt_port;
	u_long	rmt_proc;
	struct encap_parms rmt_args;
};

/*
 * Version of xdr_rmtcall_args() that supports both directions
 */
static bool_t
portmap_xdr_rmtcall_args(XDR *xdrs, struct rmtcallargs *cap)
{

	/* does not get a port number */
	if (xdr_u_long(xdrs, &(cap->rmt_prog)) &&
	    xdr_u_long(xdrs, &(cap->rmt_vers)) &&
	    xdr_u_long(xdrs, &(cap->rmt_proc))) {
		return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
	}
	return (FALSE);
}

/*
 * Version of xdr_rmtcallres() that supports both directions
 */
static bool_t
portmap_xdr_rmtcallres(XDR *xdrs, struct rmtcallargs *cap)
{
	if (xdr_u_long(xdrs, &(cap->rmt_port)))
		return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
	return (FALSE);
}

/*
 * only worries about the struct encap_parms part of struct rmtcallargs.
 * The arglen must already be set!!
 */
static bool_t
xdr_opaque_parms(XDR *xdrs, struct rmtcallargs *cap)
{

	return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen));
}

/*
 * This routine finds and sets the length of incoming opaque paraters
 * and then calls xdr_opaque_parms.
 */
static bool_t
xdr_len_opaque_parms(XDR *xdrs, struct rmtcallargs *cap)
{
	u_int beginpos, lowpos, highpos, currpos, pos;

	beginpos = lowpos = pos = xdr_getpos(xdrs);
	highpos = lowpos + ARGSIZE;
	while (highpos >= lowpos) {
		currpos = (lowpos + highpos) / 2;
		if (xdr_setpos(xdrs, currpos)) {
			pos = currpos;
			lowpos = currpos + 1;
		} else {
			highpos = currpos - 1;
		}
	}
	xdr_setpos(xdrs, beginpos);
	cap->rmt_args.arglen = pos - beginpos;
	return (xdr_opaque_parms(xdrs, cap));
}

/*
 * Call a remote procedure service
 * This procedure is very quiet when things go wrong.
 * The proc is written to support broadcast rpc.  In the broadcast case,
 * a machine should shut-up instead of complain, less the requestor be
 * overrun with complaints at the expense of not hearing a valid reply ...
 *
 * This now forks so that the program & process that it calls can call
 * back to the portmapper.
 */
void
callit(struct svc_req *rqstp, SVCXPRT *xprt)
{
	struct rmtcallargs a;
	struct pmaplist *pml;
	u_short port;
	struct sockaddr_in me;
	pid_t pid;
	int so = -1;
	CLIENT *client;
	struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred;
	struct timeval timeout;
	char buf[ARGSIZE];

	timeout.tv_sec = 5;
	timeout.tv_usec = 0;
	a.rmt_args.args = buf;
	if (!svc_getargs(xprt, portmap_xdr_rmtcall_args, (caddr_t)&a))
		return;
	if (!check_callit(svc_getcaller(xprt), a.rmt_prog, a.rmt_proc))
		return;
	if ((pml = find_service(a.rmt_prog, a.rmt_vers,
	    (u_long)IPPROTO_UDP)) == NULL)
		return;

	/*
	 * fork a child to do the work.  Parent immediately returns.
	 * Child exits upon completion.
	 */
	if ((pid = fork()) != 0) {
		if (pid == -1)
			syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m",
			    a.rmt_prog);
		return;
	}

	if (pledge("stdio rpath inet flock cpath wpath", NULL) == -1)
		err(1, "pledge");

	port = pml->pml_map.pm_port;
	get_myaddress(&me);
	me.sin_port = htons(port);

	/* Avoid implicit binding to reserved port by clntudp_create() */
	so = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
	if (so == -1)
		exit(1);

	client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &so);
	if (client != NULL) {
		if (rqstp->rq_cred.oa_flavor == AUTH_UNIX)
			client->cl_auth = authunix_create(au->aup_machname,
			    au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids);
		a.rmt_port = (u_long)port;
		if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a,
		    xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS)
			svc_sendreply(xprt, portmap_xdr_rmtcallres, (caddr_t)&a);
		AUTH_DESTROY(client->cl_auth);
		clnt_destroy(client);
	}
	(void)close(so);
	exit(0);
}

/* ARGSUSED */
void
reap(int signo)
{
	int save_errno = errno;

	while (wait3(NULL, WNOHANG, NULL) > 0)
		;
	errno = save_errno;
}

#define	NFSPROG			((u_long) 100003)
#define	MOUNTPROG		((u_long) 100005)
#define	YPXPROG			((u_long) 100069)
#define	YPPROG			((u_long) 100004)
#define	YPPROC_DOMAIN_NONACK	((u_long) 2)
#define	MOUNTPROC_MNT		((u_long) 1)
#define XXXPROC_NOP		((u_long) 0)

int
check_callit(struct sockaddr_in *addr, u_long prog, u_long aproc)
{
	if ((prog == PMAPPROG && aproc != XXXPROC_NOP) ||
	    (prog == NFSPROG && aproc != XXXPROC_NOP) ||
	    (prog == YPXPROG && aproc != XXXPROC_NOP) ||
	    (prog == MOUNTPROG && aproc == MOUNTPROC_MNT) ||
	    (prog == YPPROG && aproc != YPPROC_DOMAIN_NONACK)) {
		syslog(LOG_WARNING,
		    "callit prog %ld aproc %ld (might be from %s)",
		    prog, aproc, inet_ntoa(addr->sin_addr));
		return (FALSE);
	}
	return (TRUE);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: portmap.c,v 1.48 2015/10/14 13:32:44 jsg Exp $ */
2
3			/*-
4			* Copyright (c) 1996, 1997 Theo de Raadt (OpenBSD). All rights reserved.
5			* Copyright (c) 1990 The Regents of the University of California.
6			* All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			* 3. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32			/*
33			* Copyright (c) 2010, Oracle America, Inc.
34			*
35			* Redistribution and use in source and binary forms, with or without
36			* modification, are permitted provided that the following conditions are
37			* met:
38			*
39			* * Redistributions of source code must retain the above copyright
40			* notice, this list of conditions and the following disclaimer.
41			* * Redistributions in binary form must reproduce the above
42			* copyright notice, this list of conditions and the following
43			* disclaimer in the documentation and/or other materials
44			* provided with the distribution.
45			* * Neither the name of the "Oracle America, Inc." nor the names of its
46			* contributors may be used to endorse or promote products derived
47			* from this software without specific prior written permission.
48			*
49			* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
50			* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
51			* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
52			* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
53			* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
54			* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
56			* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
57			* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
58			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
59			* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60			* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61			*/
62
63			/*
64			* portmap.c, Implements the program,version to port number mapping for
65			* rpc.
66			*/
67
68			#include <sys/types.h>
69			#include <sys/socket.h>
70			#include <sys/wait.h>
71			#include <sys/resource.h>
72
73			#include <rpcsvc/nfs_prot.h>
74			#include <arpa/inet.h>
75			#include <rpc/rpc.h>
76			#include <rpc/pmap_prot.h>
77
78			#include <signal.h>
79			#include <stdio.h>
80			#include <stdlib.h>
81			#include <string.h>
82			#include <syslog.h>
83			#include <unistd.h>
84			#include <netdb.h>
85			#include <pwd.h>
86			#include <errno.h>
87			#include <err.h>
88
89			void reg_service(struct svc_req , SVCXPRT );
90			void reap(int);
91			void callit(struct svc_req , SVCXPRT );
92			int check_callit(struct sockaddr_in *, u_long, u_long);
93			struct pmaplist *find_service(u_long, u_long, u_long);
94
95			struct pmaplist *pmaplist;
96			int debugging;
97
98			SVCXPRT ludpxprt, ltcpxprt;
99
100			int
101			main(int argc, char *argv[])
102			{
103			int sock, lsock, c, on = 1;
104			socklen_t len = sizeof(struct sockaddr_in);
105			struct sockaddr_in addr, laddr;
106			struct pmaplist *pml;
107			struct passwd *pw;
108			SVCXPRT *xprt;
109
110			while ((c = getopt(argc, argv, "d")) != -1) {
111			switch (c) {
112			case 'd':
113			debugging = 1;
114			break;
115			default:
116			(void)fprintf(stderr, "usage: %s [-d]\n", argv[0]);
117			exit(1);
118			}
119			}
120
121			if (!debugging && daemon(0, 0)) {
122			(void)fprintf(stderr, "portmap: fork: %s", strerror(errno));
123			exit(1);
124			}
125
126			openlog("portmap", LOG_NDELAY \| (debugging ? LOG_PID \| LOG_PERROR :
127			LOG_PID), LOG_DAEMON);
128
129			bzero(&addr, sizeof addr);
130			addr.sin_addr.s_addr = 0;
131			addr.sin_family = AF_INET;
132			addr.sin_addr.s_addr = htonl(INADDR_ANY);
133			addr.sin_port = htons(PMAPPORT);
134
135			bzero(&laddr, sizeof laddr);
136			laddr.sin_addr.s_addr = 0;
137			laddr.sin_family = AF_INET;
138			laddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
139			laddr.sin_port = htons(PMAPPORT);
140
141			if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
142			syslog(LOG_ERR, "cannot create udp socket: %m");
143			exit(1);
144			}
145			setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
146			if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
147			syslog(LOG_ERR, "cannot bind udp: %m");
148			exit(1);
149			}
150
151			if ((xprt = svcudp_create(sock)) == NULL) {
152			syslog(LOG_ERR, "couldn't do udp_create");
153			exit(1);
154			}
155
156			if ((lsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
157			syslog(LOG_ERR, "cannot create udp socket: %m");
158			exit(1);
159			}
160			setsockopt(lsock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
161			if (bind(lsock, (struct sockaddr *)&laddr, len) != 0) {
162			syslog(LOG_ERR, "cannot bind local udp: %m");
163			exit(1);
164			}
165
166			if ((ludpxprt = svcudp_create(lsock)) == NULL) {
167			syslog(LOG_ERR, "couldn't do udp_create");
168			exit(1);
169			}
170
171			/* make an entry for ourself */
172			pml = malloc(sizeof(struct pmaplist));
173			if (pml == NULL) {
174			syslog(LOG_ERR, "out of memory");
175			exit(1);
176			}
177			pml->pml_next = 0;
178			pml->pml_map.pm_prog = PMAPPROG;
179			pml->pml_map.pm_vers = PMAPVERS;
180			pml->pml_map.pm_prot = IPPROTO_UDP;
181			pml->pml_map.pm_port = PMAPPORT;
182			pmaplist = pml;
183
184			if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
185			syslog(LOG_ERR, "cannot create tcp socket: %m");
186			exit(1);
187			}
188			setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
189			if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
190			syslog(LOG_ERR, "cannot bind tcp: %m");
191			exit(1);
192			}
193			if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE)) ==
194			NULL) {
195			syslog(LOG_ERR, "couldn't do tcp_create");
196			exit(1);
197			}
198
199			if ((lsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
200			syslog(LOG_ERR, "cannot create tcp socket: %m");
201			exit(1);
202			}
203			setsockopt(lsock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on);
204			if (bind(lsock, (struct sockaddr *)&laddr, len) != 0) {
205			syslog(LOG_ERR, "cannot bind tcp: %m");
206			exit(1);
207			}
208			if ((ltcpxprt = svctcp_create(lsock, RPCSMALLMSGSIZE,
209			RPCSMALLMSGSIZE)) == NULL) {
210			syslog(LOG_ERR, "couldn't do tcp_create");
211			exit(1);
212			}
213
214			/* make an entry for ourself */
215			pml = malloc(sizeof(struct pmaplist));
216			if (pml == NULL) {
217			syslog(LOG_ERR, "out of memory");
218			exit(1);
219			}
220			pml->pml_map.pm_prog = PMAPPROG;
221			pml->pml_map.pm_vers = PMAPVERS;
222			pml->pml_map.pm_prot = IPPROTO_TCP;
223			pml->pml_map.pm_port = PMAPPORT;
224			pml->pml_next = pmaplist;
225			pmaplist = pml;
226
227			if ((pw = getpwnam("_portmap")) == NULL) {
228			syslog(LOG_ERR, "no such user _portmap");
229			exit(1);
230			}
231			if (chroot("/var/empty") == -1) {
232			syslog(LOG_ERR, "cannot chroot to /var/empty.");
233			exit(1);
234			}
235			if (chdir("/") == -1) {
236			syslog(LOG_ERR, "cannot chdir to new /.");
237			exit(1);
238			}
239
240			if (pw) {
241			if (setgroups(1, &pw->pw_gid) == -1 \|\|
242			setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1 \|\|
243			setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) {
244			syslog(LOG_ERR, "revoke privs: %s", strerror(errno));
245			exit(1);
246			}
247			}
248			endpwent();
249
250			if (pledge("stdio rpath inet proc flock cpath wpath", NULL) == -1)
251			err(1, "pledge");
252
253			if (svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE) == 0) {
254			syslog(LOG_ERR, "svc_register failed.");
255			exit(1);
256			}
257
258			(void)signal(SIGCHLD, reap);
259			svc_run();
260			syslog(LOG_ERR, "svc_run returned unexpectedly");
261			abort();
262			}
263
264			struct pmaplist *
265			find_service(u_long prog, u_long vers, u_long prot)
266			{
267			struct pmaplist *hit = NULL;
268			struct pmaplist *pml;
269
270			for (pml = pmaplist; pml != NULL; pml = pml->pml_next) {
271			if ((pml->pml_map.pm_prog != prog) \|\|
272			(pml->pml_map.pm_prot != prot))
273			continue;
274			hit = pml;
275			if (pml->pml_map.pm_vers == vers)
276			break;
277			}
278			return (hit);
279			}
280
281			/*
282			* 1 OK, 0 not
283			*/
284			void
285			reg_service(struct svc_req rqstp, SVCXPRT xprt)
286			{
287			struct pmap reg;
288			struct pmaplist pml, prevpml, *fnd;
289			struct sockaddr_in *fromsin;
290			long ans = 0, port;
291			void *t;
292
293			fromsin = svc_getcaller(xprt);
294
295			if (debugging)
296			(void)fprintf(stderr, "server: about to do a switch\n");
297			switch (rqstp->rq_proc) {
298			case PMAPPROC_NULL:
299			/*
300			* Null proc call
301			*/
302			if (!svc_sendreply(xprt, xdr_void, NULL) && debugging) {
303			abort();
304			}
305			break;
306			case PMAPPROC_SET:
307			/*
308			* Set a program,version to port mapping
309			*/
310			if (xprt != ltcpxprt && xprt != ludpxprt) {
311			syslog(LOG_WARNING,
312			"non-local set attempt (might be from %s)",
313			inet_ntoa(fromsin->sin_addr));
314			svcerr_noproc(xprt);
315			return;
316			}
317			if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg)) {
318			svcerr_decode(xprt);
319			break;
320			}
321
322			/*
323			* check to see if already used
324			* find_service returns a hit even if
325			* the versions don't match, so check for it
326			*/
327			fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
328			if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) {
329			if (fnd->pml_map.pm_port == reg.pm_port)
330			ans = 1;
331			goto done;
332			}
333
334			if (debugging)
335			printf("set: prog %lu vers %lu port %lu\n",
336			reg.pm_prog, reg.pm_vers, reg.pm_port);
337
338			if (reg.pm_port & ~0xffff)
339			goto done;
340
341			/*
342			* only permit localhost root to create
343			* mappings pointing at sensitive ports
344			*/
345			if ((reg.pm_port < IPPORT_RESERVED \|\|
346			reg.pm_port == NFS_PORT) &&
347			htons(fromsin->sin_port) >= IPPORT_RESERVED) {
348			syslog(LOG_WARNING,
349			"resvport set attempt by non-root");
350			goto done;
351			}
352
353			/*
354			* add to END of list
355			*/
356			pml = malloc(sizeof(struct pmaplist));
357			if (pml == NULL) {
358			syslog(LOG_ERR, "out of memory");
359			svcerr_systemerr(xprt);
360			return;
361			}
362
363			pml->pml_map = reg;
364			pml->pml_next = 0;
365			if (pmaplist == NULL) {
366			pmaplist = pml;
367			} else {
368			for (fnd = pmaplist; fnd->pml_next != 0;
369			fnd = fnd->pml_next)
370			;
371			fnd->pml_next = pml;
372			}
373			ans = 1;
374			done:
375			if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
376			debugging) {
377			(void)fprintf(stderr, "svc_sendreply\n");
378			abort();
379			}
380			break;
381			case PMAPPROC_UNSET:
382			/*
383			* Remove a program,version to port mapping.
384			*/
385			if (xprt != ltcpxprt && xprt != ludpxprt) {
386			syslog(LOG_WARNING,
387			"non-local unset attempt (might be from %s)",
388			inet_ntoa(fromsin->sin_addr));
389			svcerr_noproc(xprt);
390			return;
391			}
392			if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg)) {
393			svcerr_decode(xprt);
394			break;
395			}
396			for (prevpml = NULL, pml = pmaplist; pml != NULL; ) {
397			if ((pml->pml_map.pm_prog != reg.pm_prog) \|\|
398			(pml->pml_map.pm_vers != reg.pm_vers)) {
399			/* both pml & prevpml move forwards */
400			prevpml = pml;
401			pml = pml->pml_next;
402			continue;
403			}
404			if ((pml->pml_map.pm_port < IPPORT_RESERVED \|\|
405			pml->pml_map.pm_port == NFS_PORT) &&
406			htons(fromsin->sin_port) >= IPPORT_RESERVED) {
407			syslog(LOG_WARNING,
408			"resvport unset attempt by non-root");
409			break;
410			}
411
412			/* found it; pml moves forward, prevpml stays */
413			ans = 1;
414			t = pml;
415			pml = pml->pml_next;
416			if (prevpml == NULL)
417			pmaplist = pml;
418			else
419			prevpml->pml_next = pml;
420			free(t);
421			}
422			if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
423			debugging) {
424			fprintf(stderr, "svc_sendreply\n");
425			abort();
426			}
427			break;
428			case PMAPPROC_GETPORT:
429			/*
430			* Lookup the mapping for a program,version and return its port
431			*/
432			if (!svc_getargs(xprt, xdr_pmap, (caddr_t)&reg)) {
433			svcerr_decode(xprt);
434			break;
435			}
436			fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
437			if (fnd)
438			port = fnd->pml_map.pm_port;
439			else
440			port = 0;
441			if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) &&
442			debugging) {
443			fprintf(stderr, "svc_sendreply\n");
444			abort();
445			}
446			break;
447			case PMAPPROC_DUMP:
448			/*
449			* Return the current set of mapped program,version
450			*/
451			if (!svc_getargs(xprt, xdr_void, NULL)) {
452			svcerr_decode(xprt);
453			break;
454			}
455			if (!svc_sendreply(xprt, xdr_pmaplist, (caddr_t)&pmaplist) &&
456			debugging) {
457			fprintf(stderr, "svc_sendreply\n");
458			abort();
459			}
460			break;
461			case PMAPPROC_CALLIT:
462			/*
463			* Calls a procedure on the local machine. If the requested
464			* procedure is not registered this procedure does not return
465			* error information!!
466			* This procedure is only supported on rpc/udp and calls via
467			* rpc/udp. It passes null authentication parameters.
468			*/
469			callit(rqstp, xprt);
470			break;
471			default:
472			svcerr_noproc(xprt);
473			break;
474			}
475			}
476
477
478			/*
479			* Stuff for the rmtcall service
480			*/
481			#define ARGSIZE 9000
482
483			struct encap_parms {
484			u_int arglen;
485			char *args;
486			};
487
488			static bool_t
489			xdr_encap_parms(XDR xdrs, struct encap_parms epp)
490			{
491
492			return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
493			}
494
495			struct rmtcallargs {
496			u_long rmt_prog;
497			u_long rmt_vers;
498			u_long rmt_port;
499			u_long rmt_proc;
500			struct encap_parms rmt_args;
501			};
502
503			/*
504			* Version of xdr_rmtcall_args() that supports both directions
505			*/
506			static bool_t
507			portmap_xdr_rmtcall_args(XDR xdrs, struct rmtcallargs cap)
508			{
509
510			/* does not get a port number */
511			if (xdr_u_long(xdrs, &(cap->rmt_prog)) &&
512			xdr_u_long(xdrs, &(cap->rmt_vers)) &&
513			xdr_u_long(xdrs, &(cap->rmt_proc))) {
514			return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
515			}
516			return (FALSE);
517			}
518
519			/*
520			* Version of xdr_rmtcallres() that supports both directions
521			*/
522			static bool_t
523			portmap_xdr_rmtcallres(XDR xdrs, struct rmtcallargs cap)
524			{
525			if (xdr_u_long(xdrs, &(cap->rmt_port)))
526			return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
527			return (FALSE);
528			}
529
530			/*
531			* only worries about the struct encap_parms part of struct rmtcallargs.
532			* The arglen must already be set!!
533			*/
534			static bool_t
535			xdr_opaque_parms(XDR xdrs, struct rmtcallargs cap)
536			{
537
538			return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen));
539			}
540
541			/*
542			* This routine finds and sets the length of incoming opaque paraters
543			* and then calls xdr_opaque_parms.
544			*/
545			static bool_t
546			xdr_len_opaque_parms(XDR xdrs, struct rmtcallargs cap)
547			{
548			u_int beginpos, lowpos, highpos, currpos, pos;
549
550			beginpos = lowpos = pos = xdr_getpos(xdrs);
551			highpos = lowpos + ARGSIZE;
552			while (highpos >= lowpos) {
553			currpos = (lowpos + highpos) / 2;
554			if (xdr_setpos(xdrs, currpos)) {
555			pos = currpos;
556			lowpos = currpos + 1;
557			} else {
558			highpos = currpos - 1;
559			}
560			}
561			xdr_setpos(xdrs, beginpos);
562			cap->rmt_args.arglen = pos - beginpos;
563			return (xdr_opaque_parms(xdrs, cap));
564			}
565
566			/*
567			* Call a remote procedure service
568			* This procedure is very quiet when things go wrong.
569			* The proc is written to support broadcast rpc. In the broadcast case,
570			* a machine should shut-up instead of complain, less the requestor be
571			* overrun with complaints at the expense of not hearing a valid reply ...
572			*
573			* This now forks so that the program & process that it calls can call
574			* back to the portmapper.
575			*/
576			void
577			callit(struct svc_req rqstp, SVCXPRT xprt)
578			{
579			struct rmtcallargs a;
580			struct pmaplist *pml;
581			u_short port;
582			struct sockaddr_in me;
583			pid_t pid;
584			int so = -1;
585			CLIENT *client;
586			struct authunix_parms au = (struct authunix_parms )rqstp->rq_clntcred;
587			struct timeval timeout;
588			char buf[ARGSIZE];
589
590			timeout.tv_sec = 5;
591			timeout.tv_usec = 0;
592			a.rmt_args.args = buf;
593			if (!svc_getargs(xprt, portmap_xdr_rmtcall_args, (caddr_t)&a))
594			return;
595			if (!check_callit(svc_getcaller(xprt), a.rmt_prog, a.rmt_proc))
596			return;
597			if ((pml = find_service(a.rmt_prog, a.rmt_vers,
598			(u_long)IPPROTO_UDP)) == NULL)
599			return;
600
601			/*
602			* fork a child to do the work. Parent immediately returns.
603			* Child exits upon completion.
604			*/
605			if ((pid = fork()) != 0) {
606			if (pid == -1)
607			syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m",
608			a.rmt_prog);
609			return;
610			}
611
612			if (pledge("stdio rpath inet flock cpath wpath", NULL) == -1)
613			err(1, "pledge");
614
615			port = pml->pml_map.pm_port;
616			get_myaddress(&me);
617			me.sin_port = htons(port);
618
619			/* Avoid implicit binding to reserved port by clntudp_create() */
620			so = socket(AF_INET, SOCK_DGRAM \| SOCK_NONBLOCK, IPPROTO_UDP);
621			if (so == -1)
622			exit(1);
623
624			client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &so);
625			if (client != NULL) {
626			if (rqstp->rq_cred.oa_flavor == AUTH_UNIX)
627			client->cl_auth = authunix_create(au->aup_machname,
628			au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids);
629			a.rmt_port = (u_long)port;
630			if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a,
631			xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS)
632			svc_sendreply(xprt, portmap_xdr_rmtcallres, (caddr_t)&a);
633			AUTH_DESTROY(client->cl_auth);
634			clnt_destroy(client);
635			}
636			(void)close(so);
637			exit(0);
638			}
639
640			/* ARGSUSED */
641			void
642			reap(int signo)
643			{
644			int save_errno = errno;
645
646			while (wait3(NULL, WNOHANG, NULL) > 0)
647			;
648			errno = save_errno;
649			}
650
651			#define NFSPROG ((u_long) 100003)
652			#define MOUNTPROG ((u_long) 100005)
653			#define YPXPROG ((u_long) 100069)
654			#define YPPROG ((u_long) 100004)
655			#define YPPROC_DOMAIN_NONACK ((u_long) 2)
656			#define MOUNTPROC_MNT ((u_long) 1)
657			#define XXXPROC_NOP ((u_long) 0)
658
659			int
660			check_callit(struct sockaddr_in *addr, u_long prog, u_long aproc)
661			{
662			if ((prog == PMAPPROG && aproc != XXXPROC_NOP) \|\|
663			(prog == NFSPROG && aproc != XXXPROC_NOP) \|\|
664			(prog == YPXPROG && aproc != XXXPROC_NOP) \|\|
665			(prog == MOUNTPROG && aproc == MOUNTPROC_MNT) \|\|
666			(prog == YPPROG && aproc != YPPROC_DOMAIN_NONACK)) {
667			syslog(LOG_WARNING,
668			"callit prog %ld aproc %ld (might be from %s)",
669			prog, aproc, inet_ntoa(addr->sin_addr));
670			return (FALSE);
671			}
672			return (TRUE);
673			}