/*	$NetBSD: rpcb_svc_4.c,v 1.9 2019/01/03 19:04:21 christos Exp $	*/
/* $FreeBSD: head/usr.sbin/rpcbind/rpcb_svc_4.c 258564 2013-11-25 16:44:02Z hrs $ */

/*-
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * 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 Sun Microsystems, 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.
 */
/*
 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
 */

/* #ident	"@(#)rpcb_svc_4.c	1.8	93/07/05 SMI" */

/*
 * rpcb_svc_4.c
 * The server procedure for the version 4 rpcbind.
 *
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <rpc/rpc.h>
#include <stdio.h>
#include <unistd.h>
#include <netconfig.h>
#include <syslog.h>
#include <string.h>
#include <stdlib.h>
#include "rpcbind.h"

static void *rpcbproc_getaddr_4_local(void *, struct svc_req *, SVCXPRT *,
    rpcvers_t);
static void *rpcbproc_getversaddr_4_local(void *, struct svc_req *, SVCXPRT *,
    rpcvers_t);
static void *rpcbproc_getaddrlist_4_local(void *, struct svc_req *, SVCXPRT *,
    rpcvers_t);
static void free_rpcb_entry_list(rpcb_entry_list_ptr *);
static void *rpcbproc_dump_4_local(void *, struct svc_req *, SVCXPRT *,
    rpcvers_t);

/*
 * Called by svc_getreqset. There is a separate server handle for
 * every transport that it waits on.
 */
void
rpcb_service_4(struct svc_req *rqstp, SVCXPRT *transp)
{
	union {
		rpcb rpcbproc_set_4_arg;
		rpcb rpcbproc_unset_4_arg;
		rpcb rpcbproc_getaddr_4_local_arg;
		char *rpcbproc_uaddr2taddr_4_arg;
		struct netbuf rpcbproc_taddr2uaddr_4_arg;
	} argument;
	char *result;
	xdrproc_t xdr_argument, xdr_result;
	void *(*local)(void *, struct svc_req *, SVCXPRT *, rpcvers_t);

	rpcbs_procinfo(RPCBVERS_4_STAT, rqstp->rq_proc);

	switch (rqstp->rq_proc) {
	case NULLPROC:
		/*
		 * Null proc call
		 */
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_NULL\n");
#endif
		check_access(transp, rqstp->rq_proc, NULL, RPCBVERS4);
		(void) svc_sendreply(transp, (xdrproc_t) xdr_void, NULL);
		return;

	case RPCBPROC_SET:
		/*
		 * Check to see whether the message came from
		 * loopback transports (for security reasons)
		 */
		xdr_argument = (xdrproc_t)xdr_rpcb;
		xdr_result = (xdrproc_t)xdr_bool;
		local = rpcbproc_set_com;
		break;

	case RPCBPROC_UNSET:
		/*
		 * Check to see whether the message came from
		 * loopback transports (for security reasons)
		 */
		xdr_argument = (xdrproc_t)xdr_rpcb;
		xdr_result = (xdrproc_t)xdr_bool;
		local = rpcbproc_unset_com;
		break;

	case RPCBPROC_GETADDR:
		xdr_argument = (xdrproc_t)xdr_rpcb;
		xdr_result = (xdrproc_t)xdr_wrapstring;
		local = rpcbproc_getaddr_4_local;
		break;

	case RPCBPROC_GETVERSADDR:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_GETVERSADDR\n");
#endif
		xdr_argument = (xdrproc_t)xdr_rpcb;
		xdr_result = (xdrproc_t)xdr_wrapstring;
		local = rpcbproc_getversaddr_4_local;
		break;

	case RPCBPROC_DUMP:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_DUMP\n");
#endif
		xdr_argument = (xdrproc_t)xdr_void;
		xdr_result = (xdrproc_t)xdr_rpcblist_ptr;
		local = rpcbproc_dump_4_local;
		break;

	case RPCBPROC_INDIRECT:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_INDIRECT\n");
#endif
		rpcbproc_callit_com(rqstp, transp, rqstp->rq_proc, RPCBVERS4);
		return;

/*	case RPCBPROC_CALLIT: */
	case RPCBPROC_BCAST:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_BCAST\n");
#endif
		rpcbproc_callit_com(rqstp, transp, rqstp->rq_proc, RPCBVERS4);
		return;

	case RPCBPROC_GETTIME:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_GETTIME\n");
#endif
		xdr_argument = (xdrproc_t)xdr_void;
		xdr_result = (xdrproc_t)xdr_u_long;
		local = rpcbproc_gettime_com;
		break;

	case RPCBPROC_UADDR2TADDR:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_UADDR2TADDR\n");
#endif
		xdr_argument = (xdrproc_t)xdr_wrapstring;
		xdr_result = (xdrproc_t)xdr_netbuf;
		local = rpcbproc_uaddr2taddr_com;
		break;

	case RPCBPROC_TADDR2UADDR:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_TADDR2UADDR\n");
#endif
		xdr_argument = (xdrproc_t)xdr_netbuf;
		xdr_result = (xdrproc_t)xdr_wrapstring;
		local = rpcbproc_taddr2uaddr_com;
		break;

	case RPCBPROC_GETADDRLIST:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_GETADDRLIST\n");
#endif
		xdr_argument = (xdrproc_t)xdr_rpcb;
		xdr_result = (xdrproc_t)xdr_rpcb_entry_list_ptr;
		local = rpcbproc_getaddrlist_4_local;
		break;

	case RPCBPROC_GETSTAT:
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "RPCBPROC_GETSTAT\n");
#endif
		xdr_argument = (xdrproc_t)xdr_void;
		xdr_result = (xdrproc_t)xdr_rpcb_stat_byvers;
		local = rpcbproc_getstat;
		break;

	default:
		svcerr_noproc(transp);
		return;
	}
	memset((char *)&argument, 0, sizeof (argument));
	if (!svc_getargs(transp, (xdrproc_t) xdr_argument,
		(char *)&argument)) {
		svcerr_decode(transp);
		if (debugging)
			(void) fprintf(stderr, "rpcbind: could not decode\n");
		return;
	}
	if (!check_access(transp, rqstp->rq_proc, &argument, RPCBVERS4)) {
		svcerr_weakauth(transp);
		goto done;
	}
	result = (*local)(&argument, rqstp, transp, RPCBVERS4);
	if (result != NULL && !svc_sendreply(transp, (xdrproc_t) xdr_result,
						result)) {
		svcerr_systemerr(transp);
		if (debugging) {
			(void) fprintf(stderr, "rpcbind: svc_sendreply\n");
			if (doabort) {
				rpcbind_abort();
			}
		}
	}
done:
	if (!svc_freeargs(transp, (xdrproc_t) xdr_argument,
				(char *)&argument)) {
		if (debugging) {
			(void) fprintf(stderr, "unable to free arguments\n");
			if (doabort) {
				rpcbind_abort();
			}
		}
	}
	return;
}

/*
 * Lookup the mapping for a program, version and return its
 * address. Assuming that the caller wants the address of the
 * server running on the transport on which the request came.
 * Even if a service with a different version number is available,
 * it will return that address.  The client should check with an
 * clnt_call to verify whether the service is the one that is desired.
 * We also try to resolve the universal address in terms of
 * address of the caller.
 */
/* ARGSUSED */
static void *
rpcbproc_getaddr_4_local(void *arg, struct svc_req *rqstp, SVCXPRT *transp,
			 rpcvers_t rpcbversnum __unused)
{
	RPCB *regp = (RPCB *)arg;
#ifdef RPCBIND_DEBUG
	if (debugging) {
		char *uaddr;

		uaddr =	taddr2uaddr(rpcbind_get_conf(transp->xp_netid),
			    svc_getrpccaller(transp));
		fprintf(stderr, "RPCB_GETADDR req for (%lu, %lu, %s) from %s: ",
		    (unsigned long)regp->r_prog, (unsigned long)regp->r_vers,
		    regp->r_netid, uaddr);
		free(uaddr);
	}
#endif
	return (rpcbproc_getaddr_com(regp, rqstp, transp, RPCBVERS4,
					RPCB_ALLVERS));
}

/*
 * Lookup the mapping for a program, version and return its
 * address. Assuming that the caller wants the address of the
 * server running on the transport on which the request came.
 *
 * We also try to resolve the universal address in terms of
 * address of the caller.
 */
/* ARGSUSED */
static void *
rpcbproc_getversaddr_4_local(void *arg, struct svc_req *rqstp, SVCXPRT *transp,
			     rpcvers_t versnum __unused)
{
	RPCB *regp = (RPCB *)arg;
#ifdef RPCBIND_DEBUG
	if (debugging) {
		char *uaddr;

		uaddr = taddr2uaddr(rpcbind_get_conf(transp->xp_netid),
			    svc_getrpccaller(transp));
		fprintf(stderr, "RPCB_GETVERSADDR rqst for (%lu, %lu, %s)"
				" from %s : ",
		    (unsigned long)regp->r_prog, (unsigned long)regp->r_vers,
		    regp->r_netid, uaddr);
		free(uaddr);
	}
#endif
	return (rpcbproc_getaddr_com(regp, rqstp, transp, RPCBVERS4,
					RPCB_ONEVERS));
}

/*
 * Lookup the mapping for a program, version and return the
 * addresses for all transports in the current transport family.
 * We return a merged address.
 */
/* ARGSUSED */
static void *
rpcbproc_getaddrlist_4_local(void *arg, struct svc_req *rqstp __unused,
    SVCXPRT *transp, rpcvers_t versnum __unused)
{
	RPCB *regp = (RPCB *)arg;
	static rpcb_entry_list_ptr rlist;
	register rpcblist_ptr rbl;
	rpcb_entry_list_ptr rp, tail;
	rpcprog_t prog;
	rpcvers_t vers;
	rpcb_entry *a;
	struct netconfig *nconf;
	struct netconfig *reg_nconf;
	char *saddr, *maddr = NULL;

	free_rpcb_entry_list(&rlist);
	tail = NULL;
	prog = regp->r_prog;
	vers = regp->r_vers;
	reg_nconf = rpcbind_get_conf(transp->xp_netid);
	if (reg_nconf == NULL)
		return (NULL);
	if (*(regp->r_addr) != '\0') {
		saddr = regp->r_addr;
	} else {
		saddr = NULL;
	}
#ifdef RPCBIND_DEBUG
	if (debugging) {
		fprintf(stderr, "r_addr: %s r_netid: %s nc_protofmly: %s\n",
		    regp->r_addr, regp->r_netid, reg_nconf->nc_protofmly);
	}
#endif
	for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) {
	    if ((rbl->rpcb_map.r_prog == prog) &&
		(rbl->rpcb_map.r_vers == vers)) {
		nconf = rpcbind_get_conf(rbl->rpcb_map.r_netid);
		if (nconf == NULL)
			goto fail;
		if (strcmp(nconf->nc_protofmly, reg_nconf->nc_protofmly)
				!= 0) {
			continue;	/* not same proto family */
		}
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, "\tmerge with: %s\n",
			    rbl->rpcb_map.r_addr);
#endif
		if ((maddr = mergeaddr(transp, rbl->rpcb_map.r_netid,
				rbl->rpcb_map.r_addr, saddr)) == NULL) {
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, " FAILED\n");
#endif
			continue;
		} else if (!maddr[0]) {
#ifdef RPCBIND_DEBUG
	if (debugging)
		fprintf(stderr, " SUCCEEDED, but port died -  maddr: nullstring\n");
#endif
			/* The server died. Unset this combination */
			delete_prog(regp->r_prog);
			continue;
		}
#ifdef RPCBIND_DEBUG
		if (debugging)
			fprintf(stderr, " SUCCEEDED maddr: %s\n", maddr);
#endif
		/*
		 * Add it to rlist.
		 */
		rp = malloc(sizeof(*rp));
		if (rp == NULL)
			goto fail;
		a = &rp->rpcb_entry_map;
		a->r_maddr = maddr;
		a->r_nc_netid = nconf->nc_netid;
		a->r_nc_semantics = nconf->nc_semantics;
		a->r_nc_protofmly = nconf->nc_protofmly;
		a->r_nc_proto = nconf->nc_proto;
		rp->rpcb_entry_next = NULL;
		if (rlist == NULL) {
			rlist = rp;
			tail = rp;
		} else if (tail) {
			tail->rpcb_entry_next = rp;
			tail = rp;
		}
		rp = NULL;
	    }
	}
#ifdef RPCBIND_DEBUG
	if (debugging) {
		for (rp = rlist; rp; rp = rp->rpcb_entry_next) {
			fprintf(stderr, "\t%s %s\n", rp->rpcb_entry_map.r_maddr,
				rp->rpcb_entry_map.r_nc_proto);
		}
	}
#endif
	/*
	 * XXX: getaddrlist info is also being stuffed into getaddr.
	 * Perhaps wrong, but better than it not getting counted at all.
	 */
	rpcbs_getaddr(RPCBVERS4 - 2, prog, vers, transp->xp_netid, maddr);
	return (void *)&rlist;

fail:	free_rpcb_entry_list(&rlist);
	return (NULL);
}

/*
 * Free only the allocated structure, rest is all a pointer to some
 * other data somewhere else.
 */
static void
free_rpcb_entry_list(rpcb_entry_list_ptr *rlistp)
{
	register rpcb_entry_list_ptr rbl, tmp;

	for (rbl = *rlistp; rbl != NULL; ) {
		tmp = rbl;
		rbl = rbl->rpcb_entry_next;
		free((char *)tmp->rpcb_entry_map.r_maddr);
		free((char *)tmp);
	}
	*rlistp = NULL;
}

/* ARGSUSED */
static void *
rpcbproc_dump_4_local(void *arg __unused, struct svc_req *req __unused,
    SVCXPRT *xprt __unused, rpcvers_t versnum __unused)
{
	return ((void *)&list_rbl);
}