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/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

/*

 * Copyright (C) 1984, Sun Microsystems, Inc.

 */

/*

 * pmap_clnt.c

 * Client interface to pmap rpc service.

 */

#define __FORCE_GLIBC

#include <features.h>

#include <stdio.h>

#include <unistd.h>

#include <net/if.h>

#include <sys/ioctl.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <rpc/rpc.h>

#include <rpc/pmap_prot.h>

#include <rpc/pmap_clnt.h>

/*

 * Same as get_myaddress, but we try to use the loopback

 * interface. portmap caches interfaces, and on DHCP clients,

 * it could be that only loopback is started at this time.

 */

static bool_t

__get_myaddress (struct sockaddr_in *addr)

{

  int s;

  char buf[BUFSIZ];

  struct ifconf ifc;

  struct ifreq ifreq, *ifr;

  int len, loopback = 1;

  if ((s = socket (AF_INET, SOCK_DGRAM, 0)) < 0)

    {

      perror ("__get_myaddress: socket");

      exit (1);

    }

  ifc.ifc_len = sizeof (buf);

  ifc.ifc_buf = buf;

  if (ioctl (s, SIOCGIFCONF, (char *) &ifc) < 0)

    {

      perror (_("__get_myaddress: ioctl (get interface configuration)"));

      exit (1);

    }

 again:

  ifr = ifc.ifc_req;

  for (len = ifc.ifc_len; len; len -= sizeof ifreq)

    {

      ifreq = *ifr;

      if (ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)

        {

          perror ("__get_myaddress: ioctl");

          exit (1);

        }

      if ((ifreq.ifr_flags & IFF_UP) && (ifr->ifr_addr.sa_family == AF_INET)

          && ((ifreq.ifr_flags & IFF_LOOPBACK) || (loopback == 0)))

        {

          *addr = *((struct sockaddr_in *) &ifr->ifr_addr);

          addr->sin_port = htons (PMAPPORT);

          close (s);

          return TRUE;

        }

      ifr++;

    }

  if (loopback == 1)

    {

      loopback = 0;

      goto again;

    }

  close (s);

  return FALSE;

}

static const struct timeval timeout = {5, 0};

static const struct timeval tottimeout = {60, 0};

/*

 * Set a mapping between program,version and port.

 * Calls the pmap service remotely to do the mapping.

 */

bool_t

pmap_set (u_long program, u_long version, int protocol, u_short port)

{

  struct sockaddr_in myaddress;

  int socket = -1;

  CLIENT *client;

  struct pmap parms;

  bool_t rslt;

  if (!__get_myaddress (&myaddress))

    return FALSE;

  client = clntudp_bufcreate (&myaddress, PMAPPROG, PMAPVERS,

                        timeout, &socket, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);

  if (client == (CLIENT *) NULL)

    return (FALSE);

  parms.pm_prog = program;

  parms.pm_vers = version;

  parms.pm_prot = protocol;

  parms.pm_port = port;

  if (CLNT_CALL (client, PMAPPROC_SET, (xdrproc_t)xdr_pmap, (caddr_t)&parms,

                 (xdrproc_t)xdr_bool, (caddr_t)&rslt,

                 tottimeout) != RPC_SUCCESS)

    {

      clnt_perror (client, _("Cannot register service"));

      return FALSE;

    }

  CLNT_DESTROY (client);

  /* (void)close(socket); CLNT_DESTROY closes it */

  return rslt;

}

/*

 * Remove the mapping between program,version and port.

 * Calls the pmap service remotely to do the un-mapping.

 */

bool_t

pmap_unset (u_long program, u_long version)

{

  struct sockaddr_in myaddress;

  int socket = -1;

  CLIENT *client;

  struct pmap parms;

  bool_t rslt;

  if (!__get_myaddress (&myaddress))

    return FALSE;

  client = clntudp_bufcreate (&myaddress, PMAPPROG, PMAPVERS,

                        timeout, &socket, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);

  if (client == (CLIENT *) NULL)

    return FALSE;

  parms.pm_prog = program;

  parms.pm_vers = version;

  parms.pm_port = parms.pm_prot = 0;

  CLNT_CALL (client, PMAPPROC_UNSET, (xdrproc_t)xdr_pmap, (caddr_t)&parms,

             (xdrproc_t)xdr_bool, (caddr_t)&rslt, tottimeout);

  CLNT_DESTROY (client);

  /* (void)close(socket); CLNT_DESTROY already closed it */

  return rslt;

}