clnt_ttysvr.c

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/* clnt_ttysvr.c - implements a portServer line based, client side RPC */
 
/* Copyright 1984-1994 Wind River Systems, Inc. */
#include "copyright_wrs.h"
 
/*
 * Copyright (c) 1987 Wind River Systems, Inc.
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * 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
 */
 
/*
modification history
--------------------
01c,01jul98,c_c  Ported to backend V2 API.
01b,05may98,rlp  added WDB_PORTSVR_SOCKET environment variable for windows port.
01a,29jan98,rlp  written, based on v01g of backend/wdbserial/clnt_tty.c
*/

#ifndef lint
/* static char sccsid[] = "@(#)clnt_tty.c 1.1 86/02/03 Copyr 1984 Sun Micro"; */
#endif

/*
 * clnt_ttysvr.c, Implements a UPD/IP based, client side RPC.
 *
 */

#ifdef WIN32
/*#define WIN32_LEAN_AND_MEAN 1*/
#include <windows.h>
#include <winbase.h>
#include <winnt.h>
#else	/* WIN32 */
#include <strings.h>
#endif	/* WIN32 */

#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
#include <malloc.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/clnt.h>
#include <rpc/rpc_msg.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include "wdbP.h"
#include "wpwrutil.h"

/* defines */

#undef DEBUG
 
#ifdef  DEBUG
#define BACKEND_DEBUG	0x01
 
int     debug = 0x01;

#define BACKEND_PRINT(FLG,X)		\
        if (debug & FLG) printf X
 
#else /* DEBUG */
 
#define BACKEND_PRINT(FLG,X)
 
#endif /* DEBUG */
 
extern bool_t xdr_opaque_auth();

/*
 * TTYSVR bases client side rpc operations
 */

static enum clnt_stat	clntttysvr_call();
static void		clntttysvr_abort();
static void		clntttysvr_geterr();
static bool_t		clntttysvr_control();
static void		clntttysvr_destroy();
static bool_t		clntttysvr_freeres();
#ifdef WIN32
static struct opaque_auth _null_auth;
/* static struct rpc_createerr rpc_createerr; */
#define mem_alloc(bsize) malloc(bsize)
#define mem_free(ptr, bsize) free(ptr)
#endif	/* WIN32 */

/*
 * Other forward static function declarations
 */

LOCAL int	clntttysvr_send ();
LOCAL int	clntttysvr_rcv  ();
LOCAL int	clntttysvr_open (); 

/* global */

#ifdef	WIN32
int		dbg_on;             /* turn on to print debug messages */
int		dbg_ch_printed = 0;      
OVERLAPPED      ovrlapped_s;
#endif	/* WIN32 */

/* locals */

static struct clnt_ops ttysvr_ops = {
	clntttysvr_call,
	clntttysvr_abort,
	clntttysvr_geterr,
	clntttysvr_freeres,
	clntttysvr_destroy,
	clntttysvr_control
};

/*
 * Private data kept per client handle
 */
struct cu_data {
	int		   cu_fd;
	int		   seqNum;
	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];
};

static int	port;		/* portServer port Number */
static char *	pPortSvrAddr;	/* portServer ip_address */

/*
 * default size fo send/rcv buffers
 */

#define TTYMSGSIZE	1500

/* default console baud rate */

#define CONSOLE_BAUD	9600

/*
 * Create a TTYSVR based client handle.
 *
 * 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 *
clntttysvr_bufcreate(program, version, wait, pDest_addr, baudRate, portNum,
								sendsz, recvsz)
	u_long program;
	u_long version;
	struct timeval wait;
	struct sockaddr_in *pDest_addr;
	int    baudRate;
	int    portNum;
	u_int sendsz;
	u_int recvsz;
{
	CLIENT *cl;
	register struct cu_data *cu;
	struct timeval now;
	struct rpc_msg call_msg;
	char   strgInit[100];
	char * pWindBase;

	cl = (CLIENT *)mem_alloc(sizeof(CLIENT));
	if (cl == NULL) {
		wpwrLogErr ("clntttysvr_create: out of memory\n");
		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
		rpc_createerr.cf_error.re_errno = errno;
		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) {
		wpwrLogErr ("clntttysvr_create: out of memory\n");
		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
		rpc_createerr.cf_error.re_errno = errno;
		goto fooy;
	}
	cu->cu_outbuf = &cu->cu_inbuf[recvsz];

#ifndef WIN32
	(void)gettimeofday(&now, (struct timezone *)0);
#else	/* WIN32 */
	{
		time_t time_val;
		(void)time(&time_val);
		now.tv_sec = time_val;
		now.tv_usec = 0;
	}
#endif	/* WIN32 */

	cl->cl_ops = &ttysvr_ops;
	cl->cl_private = (caddr_t)cu;
	cu->seqNum = (getpid() << 16);
	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));

	/* open a socket on portServer */

	cu->cu_fd = clntttysvr_open (pDest_addr);
	if (cu->cu_fd < 0) {
		wpwrLogErr ("clntttysvr_bufcreate can't create socket\n");
		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
		rpc_createerr.cf_error.re_errno = errno;
		goto fooy;

	}

	port = portNum;		/* port Number */

	pWindBase = wpwrGetEnv ("WIND_BASE");         /* get the WPWR path */

	/* configure the porserver for a wdb communication */

#ifndef	WIN32
        sprintf(strgInit, "wtxtcl %s/host/resource/wdb/wdbportsvr/portSvrConfig.tcl off %d %d %s", pWindBase, baudRate, port, pPortSvrAddr);
#else	/* WIN32 */
	sprintf(strgInit, "wtxtcl %s\\host\\resource\\wdb\\wdbportsvr\\portSvrConfig.tcl off %d %d %s", pWindBase, baudRate, port, pPortSvrAddr);
#endif	/* WIN32 */

        system (strgInit);

	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 *
clntttysvr_create(pDest_addr, program, version, wait, baudRate, portNum)
	struct sockaddr_in *pDest_addr;
	u_long program;
	u_long version;
	struct timeval wait;
	int    baudRate;
	int    portNum;
{
        return (clntttysvr_bufcreate (program, version, wait, pDest_addr,
	    baudRate, portNum, TTYMSGSIZE, TTYMSGSIZE));
}


static enum clnt_stat
clntttysvr_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 - 4.0 */
{
	register struct cu_data *cu = (struct cu_data *)cl->cl_private;
	register XDR *xdrs;
	register int outlen;
	register u_int inlen;
	fd_set readFds;
	fd_set mask;
	struct rpc_msg reply_msg;
	XDR reply_xdrs;
	struct timeval time_waited;
	bool_t ok;
	int nrefreshes = 2;
	struct timeval timeout;
	
	if (cu->cu_total.tv_usec == -1) {
		timeout = utimeout;
	} else {
		timeout = cu->cu_total;
	}

	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 (clntttysvr_send (cu->cu_fd, cu->cu_outbuf, outlen) == 0) {
		cu->cu_error.re_errno = errno;
		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 inside the loop 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;

	FD_ZERO (&mask);
	FD_SET (cu->cu_fd, &mask);

	for (;;) {
	    readFds = mask;
	    switch (select (FD_SETSIZE, &readFds, (fd_set *)NULL,
				(fd_set *)NULL, &(cu->cu_wait)))
		{

		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:
			if (errno == EINTR)
				continue;
			cu->cu_error.re_errno = errno;
			return (cu->cu_error.re_status = RPC_CANTRECV);
		}

		do {
			inlen = clntttysvr_rcv (cu->cu_fd, cu->cu_inbuf,
				cu->cu_recvsz);
		} while (inlen < 0 && (errno == EINTR));

		if (inlen < 0) {
#ifdef WIN32
			if (errno == WSAEWOULDBLOCK)
#else	/* WIN32 */
			if (errno == EWOULDBLOCK)
#endif	/* WIN32 */
				continue;
			cu->cu_error.re_errno = errno;
			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) {
#ifndef SUN4_SOLARIS2
		_seterr_reply(&reply_msg, &(cu->cu_error));
#else
		__seterr_reply(&reply_msg, &(cu->cu_error));
#endif /* !SUN4_SOLARIS2 */
		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 && 			/* 4.0 */
			    AUTH_REFRESH(cl->cl_auth))
				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