/*      $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 "namespace.h"
#include "reentrant.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <rpc/rpc.h>
#include <rpc/nettype.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
#include "un-namespace.h"

#include "rpc_com.h"
#include "mt_misc.h"

extern int __svc_vc_setflag(SVCXPRT *, int);

/*
 * The highest level interface for server creation.
 * It tries for all the nettokens in that particular class of token
 * and returns the number of handles it can create and/or find.
 *
 * It creates a link list of all the handles it could create.
 * If svc_create() is called multiple times, it uses the handle
 * created earlier instead of creating a new handle every time.
 *
 * prognum - Program number
 * versnum - Version number
 * nettype - Networktype token
 */
int
svc_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
    rpcprog_t prognum, rpcvers_t versnum, const char *nettype)
{
        struct xlist {
                SVCXPRT *xprt;          /* Server handle */
                struct xlist *next;     /* Next item */
        } *l;
        static struct xlist *xprtlist;  /* A link list of all the handles */
        int num = 0;
        SVCXPRT *xprt;
        struct netconfig *nconf;
        void *handle;

/* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */

        if ((handle = __rpc_setconf(nettype)) == NULL) {
                warnx("svc_create: unknown protocol");
                return (0);
        }
        while ((nconf = __rpc_getconf(handle)) != NULL) {
                mutex_lock(&xprtlist_lock);
                for (l = xprtlist; l; l = l->next) {
                        if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
                                /* Found an old one, use it */
                                (void) rpcb_unset(prognum, versnum, nconf);
                                if (svc_reg(l->xprt, prognum, versnum,
                                        dispatch, nconf) == FALSE)
                                        warnx(
                "svc_create: could not register prog %u vers %u on %s",
                                        (unsigned)prognum, (unsigned)versnum,
                                         nconf->nc_netid);
                                else
                                        num++;
                                break;
                        }
                }
                if (l == NULL) {
                        /* It was not found. Now create a new one */
                        xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
                        if (xprt) {
                                l = (struct xlist *)malloc(sizeof (*l));
                                if (l == NULL) {
                                        warnx("svc_create: no memory");
                                        mutex_unlock(&xprtlist_lock);
                                        num = 0;
                                        goto done;
                                }
                                l->xprt = xprt;
                                l->next = xprtlist;
                                xprtlist = l;
                                num++;
                        }
                }
                mutex_unlock(&xprtlist_lock);
        }
done:
        __rpc_endconf(handle);
        /*
         * In case of num == 0; the error messages are generated by the
         * underlying layers; and hence not needed here.
         */
        return (num);
}

/*
 * 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();
 *
 * prognum - Program number
 * versnum - Version number
 * ncofn   - Netconfig structure for the network
 */
SVCXPRT *
svc_tp_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
    rpcprog_t prognum, rpcvers_t versnum, const struct netconfig *nconf)
{
        SVCXPRT *xprt;

        if (nconf == NULL) {
                warnx(
        "svc_tp_create: invalid netconfig structure for prog %u vers %u",
                                (unsigned)prognum, (unsigned)versnum);
                return (NULL);
        }
        xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
        if (xprt == NULL) {
                return (NULL);
        }
        /*LINTED const castaway*/
        (void) rpcb_unset(prognum, versnum, (struct netconfig *) nconf);
        if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
                warnx(
                "svc_tp_create: Could not register prog %u vers %u on %s",
                                (unsigned)prognum, (unsigned)versnum,
                                nconf->nc_netid);
                SVC_DESTROY(xprt);
                return (NULL);
        }
        return (xprt);
}

/*
 * If fd is RPC_ANYFD, then it opens a fd 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.
 *
 * fd       - Connection end point
 * nconf    - Netconfig struct for nettoken
 * bindaddr - Local bind address
 * sendsz   - Max sendsize
 * recvxz   - Max recvsize
 */
SVCXPRT *
svc_tli_create(int fd, const struct netconfig *nconf,
    const struct t_bind *bindaddr, u_int sendsz, u_int recvsz)
{
        SVCXPRT *xprt = NULL;           /* service handle */
        bool_t madefd = FALSE;          /* whether fd opened here  */
        struct __rpc_sockinfo si;
        struct sockaddr_storage ss;
        socklen_t slen;

        if (fd == RPC_ANYFD) {
                if (nconf == NULL) {
                        warnx("svc_tli_create: invalid netconfig");
                        return (NULL);
                }
                fd = __rpc_nconf2fd(nconf);
                if (fd == -1) {
                        warnx(
                            "svc_tli_create: could not open connection for %s",
                                        nconf->nc_netid);
                        return (NULL);
                }
                __rpc_nconf2sockinfo(nconf, &si);
                madefd = TRUE;
        } else {
                /*
                 * It is an open descriptor. Get the transport info.
                 */
                if (!__rpc_fd2sockinfo(fd, &si)) {
                        warnx(
                "svc_tli_create: could not get transport information");
                        return (NULL);
                }
        }

        /*
         * If the fd is unbound, try to bind it.
         */
        if (madefd || !__rpc_sockisbound(fd)) {
                if (bindaddr == NULL) {
                        if (bindresvport(fd, NULL) < 0) {
                                memset(&ss, 0, sizeof ss);
                                ss.ss_family = si.si_af;
                                ss.ss_len = si.si_alen;
                                if (_bind(fd, (struct sockaddr *)(void *)&ss,
                                    (socklen_t)si.si_alen) < 0) {
                                        warnx(
                        "svc_tli_create: could not bind to anonymous port");
                                        goto freedata;
                                }
                        }
                        _listen(fd, SOMAXCONN);
                } else {
                        if (_bind(fd,
                            (struct sockaddr *)bindaddr->addr.buf,
                            (socklen_t)si.si_alen) < 0) {
                                warnx(
                "svc_tli_create: could not bind to requested address");
                                goto freedata;
                        }
                        _listen(fd, (int)bindaddr->qlen);
                }
                        
        }
        /*
         * call transport specific function.
         */
        switch (si.si_socktype) {
                case SOCK_STREAM:
                        slen = sizeof ss;
                        if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
                            == 0) {
                                /* accepted socket */
                                xprt = svc_fd_create(fd, sendsz, recvsz);
                        } else
                                xprt = svc_vc_create(fd, 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(fd, sendsz, recvsz);
                        break;
                default:
                        warnx("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);
                xprt->xp_tp = strdup(nconf->nc_device);
        }
        return (xprt);

freedata:
        if (madefd)
                (void)_close(fd);
        if (xprt) {
                if (!madefd) /* so that svc_destroy doesnt close fd */
                        xprt->xp_fd = RPC_ANYFD;
                SVC_DESTROY(xprt);
        }
        return (NULL);
}