/*      $NetBSD: svc_generic.c,v 1.3 2000/07/06 03:10:35 christos Exp $ */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

/*
 * svc_generic.c, Server side for RPC.
 *
 */

#include "opt_inet6.h"

#include <sys/param.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/sx.h>
#include <sys/ucred.h>

#include <net/vnet.h>

#include <rpc/rpc.h>
#include <rpc/rpcb_clnt.h>
#include <rpc/nettype.h>

#include <rpc/rpc_com.h>

extern int __svc_vc_setflag(SVCXPRT *, int);

/*
 * The high level interface to svc_tli_create().
 * It tries to create a server for "nconf" and registers the service
 * with the rpcbind. It calls svc_tli_create();
 */
SVCXPRT *
svc_tp_create(
        SVCPOOL *pool,
        void (*dispatch)(struct svc_req *, SVCXPRT *),
        rpcprog_t prognum,              /* Program number */
        rpcvers_t versnum,              /* Version number */
        const char *uaddr,              /* Address (or null for default) */
        const struct netconfig *nconf) /* Netconfig structure for the network */
{
        struct netconfig nconfcopy;
        struct netbuf *taddr;
        struct t_bind bind;
        SVCXPRT *xprt;

        if (nconf == NULL) {
                printf(
        "svc_tp_create: invalid netconfig structure for prog %u vers %u\n",
                                (unsigned)prognum, (unsigned)versnum);
                return (NULL);
        }
        if (uaddr) {
                taddr = uaddr2taddr(nconf, uaddr);
                bind.addr = *taddr;
                free(taddr, M_RPC);
                bind.qlen = -1;
                xprt = svc_tli_create(pool, nconf, &bind, 0, 0);
                free(bind.addr.buf, M_RPC);
        } else {
                xprt = svc_tli_create(pool, nconf, NULL, 0, 0);
        }
        if (xprt == NULL) {
                return (NULL);
        }
        /*LINTED const castaway*/
        nconfcopy = *nconf;
        (void) rpcb_unset(prognum, versnum, &nconfcopy);
        if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
                printf(
                "svc_tp_create: Could not register prog %u vers %u on %s\n",
                                (unsigned)prognum, (unsigned)versnum,
                                nconf->nc_netid);
                xprt_unregister(xprt);
                SVC_RELEASE(xprt);
                return (NULL);
        }
        return (xprt);
}

/*
 * If so is NULL, then it opens a socket for the given transport
 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
 * NULL bindadr and Connection oriented transports, the value of qlen
 * is set to 8.
 *
 * If sendsz or recvsz are zero, their default values are chosen.
 */
SVCXPRT *
svc_tli_create(
        SVCPOOL *pool,
        const struct netconfig *nconf,  /* Netconfig struct for nettoken */
        const struct t_bind *bindaddr,  /* Local bind address */
        size_t sendsz,                  /* Max sendsize */
        size_t recvsz)                  /* Max recvsize */
{
        struct socket *so;
        SVCXPRT *xprt = NULL;           /* service handle */
        struct __rpc_sockinfo si;
        struct sockaddr_storage ss;

        if (nconf == NULL) {
                printf("svc_tli_create: invalid netconfig\n");
                return (NULL);
        }
        so = __rpc_nconf2socket(nconf);
        if (!so) {
                printf(
                    "svc_tli_create: could not open connection for %s\n",
                                nconf->nc_netid);
                return (NULL);
        }
        __rpc_nconf2sockinfo(nconf, &si);

        if (bindaddr == NULL) {
                if (bindresvport(so, NULL)) {
                        memset(&ss, 0, sizeof ss);
                        ss.ss_family = si.si_af;
                        ss.ss_len = si.si_alen;
                        if (sobind(so, (struct sockaddr *)&ss,
                                curthread)) {
                                printf(
                "svc_tli_create: could not bind to anonymous port\n");
                                goto freedata;
                        }
                }
                solisten(so, -1, curthread);
        } else {
                if (bindresvport(so,
                        (struct sockaddr *)bindaddr->addr.buf)) {
                        printf(
        "svc_tli_create: could not bind to requested address\n");
                        goto freedata;
                }
                solisten(so, (int)bindaddr->qlen, curthread);
        }

        /*
         * call transport specific function.
         */
        switch (si.si_socktype) {
                case SOCK_STREAM:
#if 0
                        slen = sizeof ss;
                        if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
                            == 0) {
                                /* accepted socket */
                                xprt = svc_fd_create(fd, sendsz, recvsz);
                        } else
#endif
                                xprt = svc_vc_create(pool, so, sendsz, recvsz);
                        if (!nconf || !xprt)
                                break;
#if 0
                        /* XXX fvdl */
                        if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
                            strcmp(nconf->nc_protofmly, "inet6") == 0)
                                (void) __svc_vc_setflag(xprt, TRUE);
#endif
                        break;
                case SOCK_DGRAM:
                        xprt = svc_dg_create(pool, so, sendsz, recvsz);
                        break;
                default:
                        printf("svc_tli_create: bad service type");
                        goto freedata;
        }

        if (xprt == NULL)
                /*
                 * The error messages here are spitted out by the lower layers:
                 * svc_vc_create(), svc_fd_create() and svc_dg_create().
                 */
                goto freedata;

        /* Fill in type of service */
        xprt->xp_type = __rpc_socktype2seman(si.si_socktype);

        if (nconf) {
                xprt->xp_netid = strdup(nconf->nc_netid, M_RPC);
        }
        return (xprt);

freedata:
        (void)soclose(so);
        if (xprt)
                xprt_unregister(xprt);
        return (NULL);
}