rt-thread/components/dfs/dfs_v2/filesystems/nfs/rpc/pmap.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 */
#include "pmap.h"
#include "clnt.h"
#include <rpc/rpc.h>

static struct timeval timeout = { 5, 0 };
static struct timeval tottimeout = { 60, 0 };


bool_t xdr_pmap(XDR *xdrs, struct pmap *regs)
{
    if (xdr_u_long(xdrs, &regs->pm_prog) &&
        xdr_u_long(xdrs, &regs->pm_vers) &&
        xdr_u_long(xdrs, &regs->pm_prot))
            return (xdr_u_long(xdrs, &regs->pm_port));
    return (FALSE);
}

/*
 * Find the mapped port for program,version.
 * Calls the pmap service remotely to do the lookup.
 * Returns 0 if no map exists.
 */
unsigned short pmap_getport(struct sockaddr_in *address, unsigned long program, unsigned long version, unsigned int protocol)
{
    unsigned short port = 0;
    int socket = -1;
    register CLIENT *client = RT_NULL;
    struct pmap parms;

    address->sin_port = htons((unsigned short)PMAPPORT);
    if (protocol == IPPROTO_UDP)
      client = clntudp_bufcreate(address, PMAPPROG, PMAPVERS, timeout,
                                  &socket, RPCSMALLMSGSIZE,
                               RPCSMALLMSGSIZE);

    if (client != (CLIENT *) NULL)
    {
        parms.pm_prog = program;
        parms.pm_vers = version;
        parms.pm_prot = protocol;
        parms.pm_port = 0;      /* not needed or used */
        if (CLNT_CALL(client, PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap, (char*)&parms,
                      (xdrproc_t)xdr_u_short, (char*)&port, tottimeout) != RPC_SUCCESS)
        {
            rt_kprintf("pmap failure\n");
        }
        CLNT_DESTROY(client);
    }

    (void) lwip_close(socket);
    address->sin_port = 0;

    return (port);
}