/*
 * 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;
}
