text: /* @(#)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 <gssrpc/rpc.h>
  #include <gssrpc/pmap_clnt.h>
  #include <sys/socket.h>
  #include <netdb.h>
  
  static struct proglst {
  	char *(*p_progname)();
  	int  p_prognum;
  	int  p_procnum;
  	xdrproc_t p_inproc, p_outproc;
  	struct proglst *p_nxt;
  } *proglst;
  static void universal(struct svc_req *, SVCXPRT *);
  static SVCXPRT *transp;
  
  int
  gssrpc_registerrpc(prognum, versnum, procnum, progname, inproc, outproc)
  	char *(*progname)();
  	xdrproc_t inproc, outproc;
  	rpc_u_int32 prognum, versnum, procnum;
  {
          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) fprintf(stderr, "couldn't create an rpc server\n");
  			return (-1);
  		}
  	}
  	(void) pmap_unset((rpc_u_int32)prognum, (rpc_u_int32)versnum);
  	if (!svc_register(transp, (rpc_u_int32)prognum, (rpc_u_int32)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(rqstp, s_transp)
  	struct svc_req *rqstp;
  	SVCXPRT *s_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(s_transp, 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 */
  			memset(xdrbuf, 0, sizeof(xdrbuf)); /* required ! */
  			if (!svc_getargs(s_transp, pl->p_inproc, xdrbuf)) {
  				svcerr_decode(s_transp);
  				return;
  			}
  			outdata = (*(pl->p_progname))(xdrbuf);
  			if (outdata == NULL && pl->p_outproc != xdr_void)
  				/* there was an error */
  				return;
  			if (!svc_sendreply(s_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(s_transp, pl->p_inproc, xdrbuf);
  			return;
  		}
  	(void) fprintf(stderr, "never registered prog %d\n", prog);
  	exit(1);
  }
  
  