text: /*********************************************************************
   * RPC for the Windows NT Operating System
   * 1993 by Martin F. Gergeleit
   * Users may use, copy or modify Sun RPC for the Windows NT Operating 
   * System according to the Sun copyright below.
   *
   * RPC for the Windows NT Operating System COMES WITH ABSOLUTELY NO 
   * WARRANTY, NOR WILL I BE LIABLE FOR ANY DAMAGES INCURRED FROM THE 
   * USE OF. USE ENTIRELY AT YOUR OWN RISK!!!
   *********************************************************************/
  
  /* @(#)clnt_udp.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[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
  #endif
  
  /*
   * clnt_udp.c, Implements a UDP/IP based, client side RPC.
   *
   * Copyright (C) 1984, Sun Microsystems, Inc.
   */
  
  #include <stdio.h>
  #include <rpc/rpc.h>
  #ifdef WIN32
  #include <errno.h>
  #include <rpc/pmap_cln.h>
  #else
  #include <sys/socket.h>
  #include <sys/ioctl.h>
  #include <netdb.h>
  #include <errno.h>
  #include <rpc/pmap_clnt.h>
  
  extern int errno;
  #endif
  
  /*
   * UDP bases client side rpc operations
   */
  static enum clnt_stat	clntudp_call();
  static void		clntudp_abort();
  static void		clntudp_geterr();
  static bool_t		clntudp_freeres();
  static bool_t           clntudp_control();
  static void		clntudp_destroy();
  
  static struct clnt_ops udp_ops = {
  	clntudp_call,
  	clntudp_abort,
  	clntudp_geterr,
  	clntudp_freeres,
  	clntudp_destroy,
  	clntudp_control
  };
  
  /*
   * Private data kept per client handle
   */
  struct cu_data {
  	int		   cu_sock;
  	bool_t		   cu_closeit;
  	struct sockaddr_in cu_raddr;
  	int		   cu_rlen;
  	struct timeval	   cu_wait;
  	struct timeval     cu_total;
  	struct rpc_err	   cu_error;
  	XDR		   cu_outxdrs;
  	u_int		   cu_xdrpos;
  	u_int		   cu_sendsz;
  	char		   *cu_outbuf;
  	u_int		   cu_recvsz;
  	char		   cu_inbuf[1];
  };
  
  /*
   * Create a UDP based client handle.
   * If *sockp<0, *sockp is set to a newly created UPD socket.
   * If raddr->sin_port is 0 a binder on the remote machine
   * is consulted for the correct port number.
   * NB: It is the clients responsibility to close *sockp.
   * NB: The rpch->cl_auth is initialized to null authentication.
   *     Caller may wish to set this something more useful.
   *
   * wait is the amount of time used between retransmitting a call if
   * no response has been heard;  retransmition occurs until the actual
   * rpc call times out.
   *
   * sendsz and recvsz are the maximum allowable packet sizes that can be
   * sent and received.
   */
  CLIENT *
  clntudp_bufcreate(raddr, program, version, wait, sockp, sendsz, recvsz)
  	struct sockaddr_in *raddr;
  	u_long program;
  	u_long version;
  	struct timeval wait;
  	register int *sockp;
  	u_int sendsz;
  	u_int recvsz;
  {
  	CLIENT *cl;
  	register struct cu_data *cu;
  	struct timeval now;
  	struct rpc_msg call_msg;
  
  	cl = (CLIENT *)mem_alloc(sizeof(CLIENT));
  	if (cl == NULL) {
  #ifdef WIN32
  		nt_rpc_report("clntudp_create: out of memory\n");
  		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  		rpc_createerr.cf_error.re_errno = ENOMEM;
  #else
  		(void) fprintf(stderr, "clntudp_create: out of memory\n");
  		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  		rpc_createerr.cf_error.re_errno = errno;
  #endif
  		goto fooy;
  	}
  	sendsz = ((sendsz + 3) / 4) * 4;
  	recvsz = ((recvsz + 3) / 4) * 4;
  	cu = (struct cu_data *)mem_alloc(sizeof(*cu) + sendsz + recvsz);
  	if (cu == NULL) {
  #ifdef WIN32
  		nt_rpc_report("clntudp_create: out of memory\n");
  		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  		rpc_createerr.cf_error.re_errno = ENOMEM;
  #else
  		(void) fprintf(stderr, "clntudp_create: out of memory\n");
  		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  		rpc_createerr.cf_error.re_errno = errno;
  #endif
  		goto fooy;
  	}
  	cu->cu_outbuf = &cu->cu_inbuf[recvsz];
  
  	(void)gettimeofday(&now, (struct timezone *)0);
  	if (raddr->sin_port == 0) {
  		u_short port;
  		if ((port =
  		    pmap_getport(raddr, program, version, IPPROTO_UDP)) == 0) {
  			goto fooy;
  		}
  		raddr->sin_port = htons(port);
  	}
  	cl->cl_ops = &udp_ops;
  	cl->cl_private = (caddr_t)cu;
  	cu->cu_raddr = *raddr;
  	cu->cu_rlen = sizeof (cu->cu_raddr);
  	cu->cu_wait = wait;
  	cu->cu_total.tv_sec = -1;
  	cu->cu_total.tv_usec = -1;
  	cu->cu_sendsz = sendsz;
  	cu->cu_recvsz = recvsz;
  	call_msg.rm_xid = getpid() ^ now.tv_sec ^ now.tv_usec;
  	call_msg.rm_direction = CALL;
  	call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
  	call_msg.rm_call.cb_prog = program;
  	call_msg.rm_call.cb_vers = version;
  	xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf,
  	    sendsz, XDR_ENCODE);
  	if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) {
  		goto fooy;
  	}
  	cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs));
  	if (*sockp < 0) {
  		unsigned long dontblock = 1;
  
  		*sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  #ifdef WIN32
  		if (*sockp == INVALID_SOCKET) {
  			rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  			rpc_createerr.cf_error.re_errno = WSAerrno;
  #else
  		if (*sockp < 0) {
  			rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  			rpc_createerr.cf_error.re_errno = errno;
  #endif
  			goto fooy;
  		}
  		/* attempt to bind to prov port */
  		(void)bindresvport(*sockp, (struct sockaddr_in *)0);
  		/* the sockets rpc controls are non-blocking */
  #ifdef WIN32
  		(void)ioctlsocket(*sockp, FIONBIO, (u_long *) &dontblock);
  #else
  		(void)ioctl(*sockp, FIONBIO, (char *) &dontblock);
  #endif
  		cu->cu_closeit = TRUE;
  	} else {
  		cu->cu_closeit = FALSE;
  	}
  	cu->cu_sock = *sockp;
  	cl->cl_auth = authnone_create();
  	return (cl);
  fooy:
  	if (cu)
  		mem_free((caddr_t)cu, sizeof(*cu) + sendsz + recvsz);
  	if (cl)
  		mem_free((caddr_t)cl, sizeof(CLIENT));
  	return ((CLIENT *)NULL);
  }
  
  CLIENT *
  clntudp_create(raddr, program, version, wait, sockp)
  	struct sockaddr_in *raddr;
  	u_long program;
  	u_long version;
  	struct timeval wait;
  	register int *sockp;
  {
  
  	return(clntudp_bufcreate(raddr, program, version, wait, sockp,
  	    UDPMSGSIZE, UDPMSGSIZE));
  }
  
  static enum clnt_stat
  clntudp_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)
  	register CLIENT	*cl;		/* client handle */
  	u_long		proc;		/* procedure number */
  	xdrproc_t	xargs;		/* xdr routine for args */
  	caddr_t		argsp;		/* pointer to args */
  	xdrproc_t	xresults;	/* xdr routine for results */
  	caddr_t		resultsp;	/* pointer to results */
  	struct timeval	utimeout;	/* seconds to wait before giving up */
  {
  	register struct cu_data *cu = (struct cu_data *)cl->cl_private;
  	register XDR *xdrs;
  	register int outlen;
  	register int inlen;
  	int fromlen;
  #ifdef FD_SETSIZE
  	fd_set readfds;
  	fd_set mask;
  #else
  	int readfds;
  	register int mask;
  #endif /* def FD_SETSIZE */
  	struct sockaddr_in from;
  	struct rpc_msg reply_msg;
  	XDR reply_xdrs;
  	struct timeval time_waited;
  	bool_t ok;
  	int nrefreshes = 2;	/* number of times to refresh cred */
  	struct timeval timeout;
  
  	if (cu->cu_total.tv_usec == -1) {
  		timeout = utimeout;     /* use supplied timeout */
  	} else {
  		timeout = cu->cu_total; /* use default timeout */
  	}
  
  	time_waited.tv_sec = 0;
  	time_waited.tv_usec = 0;
  call_again:
  	xdrs = &(cu->cu_outxdrs);
  	xdrs->x_op = XDR_ENCODE;
  	XDR_SETPOS(xdrs, cu->cu_xdrpos);
  	/*
  	 * the transaction is the first thing in the out buffer
  	 */
  	(*(u_short *)(cu->cu_outbuf))++;
  
  	if ((! XDR_PUTLONG(xdrs, (long *)&proc)) ||
  	    (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
  	    (! (*xargs)(xdrs, argsp)))
  		return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
  
  	outlen = (int)XDR_GETPOS(xdrs);
  
  send_again:
  	if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0,
  	    (struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen)
  	    != outlen) {
  #ifdef WIN32
  		cu->cu_error.re_errno = WSAerrno;
  #else
  		cu->cu_error.re_errno = errno;
  #endif
  		return (cu->cu_error.re_status = RPC_CANTSEND);
  	}
  
  	/*
  	 * Hack to provide rpc-based message passing
  	 */
  	if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
  		return (cu->cu_error.re_status = RPC_TIMEDOUT);
  	}
  	/*
  	 * sub-optimal code appears here because we have
  	 * some clock time to spare while the packets are in flight.
  	 * (We assume that this is actually only executed once.)
  	 */
  	reply_msg.acpted_rply.ar_verf = _null_auth;
  	reply_msg.acpted_rply.ar_results.where = resultsp;
  	reply_msg.acpted_rply.ar_results.proc = xresults;
  #ifdef FD_SETSIZE
  	FD_ZERO(&mask);
  	FD_SET(cu->cu_sock, &mask);
  #else
  	mask = 1 << cu->cu_sock;
  #endif /* def FD_SETSIZE */
  	for (;;) {
  		readfds = mask;
  #ifdef WIN32
  		switch (select(0 /* unused in winsock */, &readfds, (fd_set *)NULL, (fd_set *)NULL, &(cu->cu_wait))) {
  #else
  		switch (select(_rpc_dtablesize(), &readfds, (int *)NULL, (int *)NULL, &(cu->cu_wait))) {
  #endif
  
  		case 0:
  			time_waited.tv_sec += cu->cu_wait.tv_sec;
  			time_waited.tv_usec += cu->cu_wait.tv_usec;
  			while (time_waited.tv_usec >= 1000000) {
  				time_waited.tv_sec++;
  				time_waited.tv_usec -= 1000000;
  			}
  			if ((time_waited.tv_sec < timeout.tv_sec) ||
  				((time_waited.tv_sec == timeout.tv_sec) &&
  				(time_waited.tv_usec < timeout.tv_usec)))
  				goto send_again;
  			return (cu->cu_error.re_status = RPC_TIMEDOUT);
  
  		/*
  		 * buggy in other cases because time_waited is not being
  		 * updated.
  		 */
  		case -1:
  #ifdef WIN32
  			if (WSAerrno == WSAEINTR)
  				continue;
  			cu->cu_error.re_errno = WSAerrno;
  #else
  			if (errno == EINTR)
  				continue;	
  			cu->cu_error.re_errno = errno;
  #endif
  			return (cu->cu_error.re_status = RPC_CANTRECV);
  		}
  		do {
  			fromlen = sizeof(struct sockaddr);
  			inlen = recvfrom(cu->cu_sock, cu->cu_inbuf,
  				(int) cu->cu_recvsz, 0,
  				(struct sockaddr *)&from, &fromlen);
  #ifdef WIN32
  		} while (inlen < 0 && WSAerrno == EINTR);
  		if (inlen < 0) {
  			if (WSAerrno == WSAEWOULDBLOCK)
  				continue;
  			cu->cu_error.re_errno = WSAerrno;
  #else
  		} while (inlen < 0 && errno == EINTR);
  		if (inlen < 0) {
  			if (errno == EWOULDBLOCK)
  				continue;	
  			cu->cu_error.re_errno = errno;
  #endif
  			return (cu->cu_error.re_status = RPC_CANTRECV);
  		}
  		if (inlen < sizeof(u_long))
  			continue;
  		/* see if reply transaction id matches sent id */
  		if (*((u_long *)(cu->cu_inbuf)) != *((u_long *)(cu->cu_outbuf)))
  			continue;
  		/* we now assume we have the proper reply */
  		break;
  	}
  
  	/*
  	 * now decode and validate the response
  	 */
  	xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE);
  	ok = xdr_replymsg(&reply_xdrs, &reply_msg);
  	/* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
  	if (ok) {
  		_seterr_reply(&reply_msg, &(cu->cu_error));
  		if (cu->cu_error.re_status == RPC_SUCCESS) {
  			if (! AUTH_VALIDATE(cl->cl_auth,
  				&reply_msg.acpted_rply.ar_verf)) {
  				cu->cu_error.re_status = RPC_AUTHERROR;
  				cu->cu_error.re_why = AUTH_INVALIDRESP;
  			}
  			if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
  				xdrs->x_op = XDR_FREE;
  				(void)xdr_opaque_auth(xdrs,
  				    &(reply_msg.acpted_rply.ar_verf));
  			}
  		}  /* end successful completion */
  		else {
  			/* maybe our credentials need to be refreshed ... */
  			if (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) {
  				nrefreshes--;
  				goto call_again;
  			}
  		}  /* end of unsuccessful completion */
  	}  /* end of valid reply message */
  	else {
  		cu->cu_error.re_status = RPC_CANTDECODERES;
  	}
  	return (cu->cu_error.re_status);
  }
  
  static void
  clntudp_geterr(cl, errp)
  	CLIENT *cl;
  	struct rpc_err *errp;
  {
  	register struct cu_data *cu = (struct cu_data *)cl->cl_private;
  
  	*errp = cu->cu_error;
  }
  
  
  static bool_t
  clntudp_freeres(cl, xdr_res, res_ptr)
  	CLIENT *cl;
  	xdrproc_t xdr_res;
  	caddr_t res_ptr;
  {
  	register struct cu_data *cu = (struct cu_data *)cl->cl_private;
  	register XDR *xdrs = &(cu->cu_outxdrs);
  
  	xdrs->x_op = XDR_FREE;
  	return ((*xdr_res)(xdrs, res_ptr));
  }
  
  static void
  clntudp_abort(/*h*/)
  	/*CLIENT *h;*/
  {
  }
  
  static bool_t
  clntudp_control(cl, request, info)
  	CLIENT *cl;
  	int request;
  	char *info;
  {
  	register struct cu_data *cu = (struct cu_data *)cl->cl_private;
  
  	switch (request) {
  	case CLSET_TIMEOUT:
  		cu->cu_total = *(struct timeval *)info;
  		break;
  	case CLGET_TIMEOUT:
  		*(struct timeval *)info = cu->cu_total;
  		break;
  	case CLSET_RETRY_TIMEOUT:
  		cu->cu_wait = *(struct timeval *)info;
  		break;
  	case CLGET_RETRY_TIMEOUT:
  		*(struct timeval *)info = cu->cu_wait;
  		break;
  	case CLGET_SERVER_ADDR:
  		*(struct sockaddr_in *)info = cu->cu_raddr;
  		break;
  	default:
  		return (FALSE);
  	}
  	return (TRUE);
  }
  
  static void
  clntudp_destroy(cl)
  	CLIENT *cl;
  {
  	register struct cu_data *cu = (struct cu_data *)cl->cl_private;
  
  	if (cu->cu_closeit) {
  #ifdef WIN32
  		(void)closesocket(cu->cu_sock);
  #else
  		(void)close(cu->cu_sock);
  #endif
  	}
  	XDR_DESTROY(&(cu->cu_outxdrs));
  	mem_free((caddr_t)cu, (sizeof(*cu) + cu->cu_sendsz + cu->cu_recvsz));
  	mem_free((caddr_t)cl, sizeof(CLIENT));
  }
  