/* @(#)svc_simple.c	2.2 88/08/01 4.0 RPCSRC */
/*
 * 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
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)svc_simple.c 1.18 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * svc_simple.c
 * Simplified front end to rpc.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include <stdio.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <netdb.h>

#ifdef USE_IN_LIBIO
# include <libio/iolibio.h>
# define fputs(s, f) _IO_fputs (s, f)
#endif

static struct proglst
  {
    char *(*p_progname) (char *);
    int p_prognum;
    int p_procnum;
    xdrproc_t p_inproc, p_outproc;
    struct proglst *p_nxt;
  }
 *proglst;

static void universal (struct svc_req *rqstp, SVCXPRT *transp);
static SVCXPRT *transp;

int
registerrpc (u_long prognum, u_long versnum, u_long procnum,
	     char *(*progname) (char *), xdrproc_t inproc, xdrproc_t outproc)
{
  struct proglst *pl;

  if (procnum == NULLPROC)
    {
      (void) fprintf (stderr,
		      _("can't reassign procedure number %d\n"), NULLPROC);
      return -1;
    }
  if (transp == 0)
    {
      transp = svcudp_create (RPC_ANYSOCK);
      if (transp == NULL)
	{
	  (void) fputs (_("couldn't create an rpc server\n"), stderr);
	  return -1;
	}
    }
  (void) pmap_unset ((u_long) prognum, (u_long) versnum);
  if (!svc_register (transp, (u_long) prognum, (u_long) versnum,
		     universal, IPPROTO_UDP))
    {
      (void) fprintf (stderr, _("couldn't register prog %d vers %d\n"),
		      prognum, versnum);
      return -1;
    }
  pl = (struct proglst *) malloc (sizeof (struct proglst));
  if (pl == NULL)
    {
      (void) fprintf (stderr, _("registerrpc: out of memory\n"));
      return -1;
    }
  pl->p_progname = progname;
  pl->p_prognum = prognum;
  pl->p_procnum = procnum;
  pl->p_inproc = inproc;
  pl->p_outproc = outproc;
  pl->p_nxt = proglst;
  proglst = pl;
  return 0;
}

static void
universal (struct svc_req *rqstp, SVCXPRT *transp)
{
  int prog, proc;
  char *outdata;
  char xdrbuf[UDPMSGSIZE];
  struct proglst *pl;

  /*
   * enforce "procnum 0 is echo" convention
   */
  if (rqstp->rq_proc == NULLPROC)
    {
      if (svc_sendreply (transp, (xdrproc_t)xdr_void, (char *) NULL) == FALSE)
	{
	  (void) fprintf (stderr, "xxx\n");
	  exit (1);
	}
      return;
    }
  prog = rqstp->rq_prog;
  proc = rqstp->rq_proc;
  for (pl = proglst; pl != NULL; pl = pl->p_nxt)
    if (pl->p_prognum == prog && pl->p_procnum == proc)
      {
	/* decode arguments into a CLEAN buffer */
	__bzero (xdrbuf, sizeof (xdrbuf));	/* required ! */
	if (!svc_getargs (transp, pl->p_inproc, xdrbuf))
	  {
	    svcerr_decode (transp);
	    return;
	  }
	outdata = (*(pl->p_progname)) (xdrbuf);
	if (outdata == NULL && pl->p_outproc != (xdrproc_t)xdr_void)
	  /* there was an error */
	  return;
	if (!svc_sendreply (transp, pl->p_outproc, outdata))
	  {
	    (void) fprintf (stderr,
			    _ ("trouble replying to prog %d\n"),
			    pl->p_prognum);
	    exit (1);
	  }
	/* free the decoded arguments */
	(void) svc_freeargs (transp, pl->p_inproc, xdrbuf);
	return;
      }
  (void) fprintf (stderr, _ ("never registered prog %d\n"), prog);
  exit (1);
}
