844812c437
these days I really should rerwite this creature from the ground up.
546 lines
16 KiB
C
546 lines
16 KiB
C
/*
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* Copyright (c) 1996, 1997
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* Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Bill Paul.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* What follows is a special version of clntudp_call() that has been
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* hacked to send requests and receive replies asynchronously. Similar
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* magic is used inside rpc.nisd(8) for the special non-blocking,
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* non-fork()ing, non-threading callback support.
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*/
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#ifndef lint
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#if 0
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static char *sccsid = "@(#)from: clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)from: clnt_udp.c 2.2 88/08/01 4.0 RPCSRC";
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#endif
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static const char rcsid[] =
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"$Id: yp_ping.c,v 1.3 1997/10/27 07:45:45 charnier Exp $";
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#endif
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/*
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* clnt_udp.c, Implements a UDP/IP based, client side RPC.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#include <rpc/pmap_clnt.h>
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#include <rpc/pmap_prot.h>
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#include <rpcsvc/yp.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include "yp_ping.h"
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#ifndef timeradd
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#ifndef KERNEL /* use timevaladd/timevalsub in kernel */
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/* NetBSD/OpenBSD compatable interfaces */
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#define timeradd(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
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if ((vvp)->tv_usec >= 1000000) { \
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(vvp)->tv_sec++; \
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(vvp)->tv_usec -= 1000000; \
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} \
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} while (0)
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#define timersub(tvp, uvp, vvp) \
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do { \
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(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
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(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
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if ((vvp)->tv_usec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_usec += 1000000; \
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} \
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} while (0)
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#endif
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#endif
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/*
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* Private data kept per client handle
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*/
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struct cu_data {
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int cu_sock;
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bool_t cu_closeit;
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struct sockaddr_in cu_raddr;
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int cu_rlen;
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struct timeval cu_wait;
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struct timeval cu_total;
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struct rpc_err cu_error;
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XDR cu_outxdrs;
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u_int cu_xdrpos;
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u_int cu_sendsz;
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char *cu_outbuf;
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u_int cu_recvsz;
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char cu_inbuf[1];
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};
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static enum clnt_stat
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clntudp_a_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)
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register CLIENT *cl; /* client handle */
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u_long proc; /* procedure number */
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xdrproc_t xargs; /* xdr routine for args */
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caddr_t argsp; /* pointer to args */
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xdrproc_t xresults; /* xdr routine for results */
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caddr_t resultsp; /* pointer to results */
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struct timeval utimeout; /* seconds to wait before giving up */
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{
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register struct cu_data *cu = (struct cu_data *)cl->cl_private;
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register XDR *xdrs;
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register int outlen = 0;
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register int inlen;
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int fromlen;
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fd_set *fds, readfds;
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struct sockaddr_in from;
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struct rpc_msg reply_msg;
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XDR reply_xdrs;
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struct timeval time_waited, start, after, tmp1, tmp2, tv;
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bool_t ok;
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int nrefreshes = 2; /* number of times to refresh cred */
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struct timeval timeout;
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if (cu->cu_total.tv_usec == -1)
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timeout = utimeout; /* use supplied timeout */
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else
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timeout = cu->cu_total; /* use default timeout */
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if (cu->cu_sock + 1 > FD_SETSIZE) {
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int bytes = howmany(cu->cu_sock + 1, NFDBITS) * sizeof(fd_mask);
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fds = (fd_set *)malloc(bytes);
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if (fds == NULL)
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return (cu->cu_error.re_status = RPC_CANTSEND);
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memset(fds, 0, bytes);
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} else {
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fds = &readfds;
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FD_ZERO(fds);
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}
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timerclear(&time_waited);
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call_again:
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xdrs = &(cu->cu_outxdrs);
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if (xargs == NULL)
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goto get_reply;
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xdrs->x_op = XDR_ENCODE;
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XDR_SETPOS(xdrs, cu->cu_xdrpos);
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/*
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* the transaction is the first thing in the out buffer
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*/
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(*(u_short *)(cu->cu_outbuf))++;
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if ((! XDR_PUTLONG(xdrs, (long *)&proc)) ||
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(! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
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(! (*xargs)(xdrs, argsp))) {
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
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}
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outlen = (int)XDR_GETPOS(xdrs);
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send_again:
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if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0,
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(struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen) != outlen) {
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cu->cu_error.re_errno = errno;
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status = RPC_CANTSEND);
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}
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/*
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* Hack to provide rpc-based message passing
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*/
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if (!timerisset(&timeout)) {
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status = RPC_TIMEDOUT);
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}
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get_reply:
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/*
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* sub-optimal code appears here because we have
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* some clock time to spare while the packets are in flight.
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* (We assume that this is actually only executed once.)
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*/
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reply_msg.acpted_rply.ar_verf = _null_auth;
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reply_msg.acpted_rply.ar_results.where = resultsp;
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reply_msg.acpted_rply.ar_results.proc = xresults;
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gettimeofday(&start, NULL);
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for (;;) {
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/* XXX we know the other bits are still clear */
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FD_SET(cu->cu_sock, fds);
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tv = cu->cu_wait;
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switch (select(cu->cu_sock+1, fds, NULL, NULL, &tv)) {
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case 0:
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timeradd(&time_waited, &cu->cu_wait, &tmp1);
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time_waited = tmp1;
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if (timercmp(&time_waited, &timeout, <))
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goto send_again;
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status = RPC_TIMEDOUT);
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case -1:
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if (errno == EINTR) {
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gettimeofday(&after, NULL);
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timersub(&after, &start, &tmp1);
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timeradd(&time_waited, &tmp1, &tmp2);
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time_waited = tmp2;
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if (timercmp(&time_waited, &timeout, <))
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continue;
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status = RPC_TIMEDOUT);
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}
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cu->cu_error.re_errno = errno;
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status = RPC_CANTRECV);
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}
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do {
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fromlen = sizeof(struct sockaddr);
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inlen = recvfrom(cu->cu_sock, cu->cu_inbuf,
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(int) cu->cu_recvsz, 0,
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(struct sockaddr *)&from, &fromlen);
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} while (inlen < 0 && errno == EINTR);
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if (inlen < 0) {
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if (errno == EWOULDBLOCK)
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continue;
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cu->cu_error.re_errno = errno;
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status = RPC_CANTRECV);
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}
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if (inlen < sizeof(u_int32_t))
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continue;
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#ifdef dont_check_xid
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/* see if reply transaction id matches sent id */
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if (*((u_int32_t *)(cu->cu_inbuf)) != *((u_int32_t *)(cu->cu_outbuf)))
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continue;
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#endif
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/* we now assume we have the proper reply */
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break;
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}
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/*
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* now decode and validate the response
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*/
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xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE);
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ok = xdr_replymsg(&reply_xdrs, &reply_msg);
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/* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */
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if (ok) {
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_seterr_reply(&reply_msg, &(cu->cu_error));
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if (cu->cu_error.re_status == RPC_SUCCESS) {
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if (! AUTH_VALIDATE(cl->cl_auth,
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&reply_msg.acpted_rply.ar_verf)) {
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cu->cu_error.re_status = RPC_AUTHERROR;
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cu->cu_error.re_why = AUTH_INVALIDRESP;
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}
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if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
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xdrs->x_op = XDR_FREE;
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(void)xdr_opaque_auth(xdrs,
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&(reply_msg.acpted_rply.ar_verf));
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}
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} /* end successful completion */
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else {
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/* maybe our credentials need to be refreshed ... */
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if (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) {
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nrefreshes--;
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goto call_again;
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}
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} /* end of unsuccessful completion */
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} /* end of valid reply message */
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else {
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cu->cu_error.re_status = RPC_CANTDECODERES;
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}
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if (fds != &readfds)
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free(fds);
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return (cu->cu_error.re_status);
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}
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/*
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* pmap_getport.c
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* Client interface to pmap rpc service.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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static struct timeval timeout = { 1, 0 };
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static struct timeval tottimeout = { 1, 0 };
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/*
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* Find the mapped port for program,version.
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* Calls the pmap service remotely to do the lookup.
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* Returns 0 if no map exists.
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*/
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static u_short
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__pmap_getport(address, program, version, protocol)
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struct sockaddr_in *address;
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u_long program;
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u_long version;
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u_int protocol;
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{
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u_short port = 0;
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int sock = -1;
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register CLIENT *client;
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struct pmap parms;
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address->sin_port = htons(PMAPPORT);
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client = clntudp_bufcreate(address, PMAPPROG,
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PMAPVERS, timeout, &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
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if (client != (CLIENT *)NULL) {
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parms.pm_prog = program;
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parms.pm_vers = version;
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parms.pm_prot = protocol;
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parms.pm_port = 0; /* not needed or used */
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if (CLNT_CALL(client, PMAPPROC_GETPORT, xdr_pmap, &parms,
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xdr_u_short, &port, tottimeout) != RPC_SUCCESS){
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rpc_createerr.cf_stat = RPC_PMAPFAILURE;
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clnt_geterr(client, &rpc_createerr.cf_error);
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} else if (port == 0) {
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rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
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}
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CLNT_DESTROY(client);
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}
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if (sock != -1)
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(void)close(sock);
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address->sin_port = 0;
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return (port);
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}
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/*
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* Transmit to YPPROC_DOMAIN_NONACK, return immediately.
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*/
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static bool_t *
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ypproc_domain_nonack_2_send(domainname *argp, CLIENT *clnt)
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{
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static bool_t clnt_res;
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struct timeval TIMEOUT = { 0, 0 };
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memset((char *)&clnt_res, 0, sizeof (clnt_res));
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if (clnt_call(clnt, YPPROC_DOMAIN_NONACK,
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(xdrproc_t) xdr_domainname, (caddr_t) argp,
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(xdrproc_t) xdr_bool, (caddr_t) &clnt_res,
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TIMEOUT) != RPC_SUCCESS) {
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return (NULL);
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}
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return (&clnt_res);
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}
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/*
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* Receive response from YPPROC_DOMAIN_NONACK asynchronously.
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*/
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static bool_t *
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ypproc_domain_nonack_2_recv(domainname *argp, CLIENT *clnt)
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{
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static bool_t clnt_res;
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struct timeval TIMEOUT = { 0, 0 };
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memset((char *)&clnt_res, 0, sizeof (clnt_res));
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if (clnt_call(clnt, YPPROC_DOMAIN_NONACK,
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(xdrproc_t) NULL, (caddr_t) argp,
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(xdrproc_t) xdr_bool, (caddr_t) &clnt_res,
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TIMEOUT) != RPC_SUCCESS) {
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return (NULL);
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}
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return (&clnt_res);
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}
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/*
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* "We have the machine that goes 'ping!'" -- Monty Python
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*
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* This function blasts packets at the YPPROC_DOMAIN_NONACK procedures
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* of the NIS servers listed in restricted_addrs structure.
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* Whoever replies the fastest becomes our chosen server.
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*
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* Note: THIS IS NOT A BROADCAST OPERATION! We could use clnt_broadcast()
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* for this, but that has the following problems:
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* - We only get the address of the machine that replied in the
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* 'eachresult' callback, and on multi-homed machines this can
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* lead to confusion.
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* - clnt_broadcast() only transmits to local networks, whereas with
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* NIS+ you can have a perfectly good server located anywhere on or
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* off the local network.
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* - clnt_broadcast() blocks for an arbitrary amount of time which the
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* caller can't control -- we want to avoid that.
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*
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* Also note that this has nothing to do with the NIS_PING procedure used
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* for replica updates.
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*/
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struct ping_req {
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struct sockaddr_in sin;
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unsigned long xid;
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};
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int __yp_ping(restricted_addrs, cnt, dom, port)
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struct in_addr *restricted_addrs;
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int cnt;
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char *dom;
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short *port;
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{
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struct timeval tv = { 5 , 0 };
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struct ping_req **reqs;
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unsigned long i;
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struct sockaddr_in sin, *any = NULL;
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int winner = -1;
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time_t xid_seed, xid_lookup;
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int sock, dontblock = 1;
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CLIENT *clnt;
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char *foo = dom;
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struct cu_data *cu;
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enum clnt_stat (*oldfunc)();
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int validsrvs = 0;
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/* Set up handles. */
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reqs = calloc(1, sizeof(struct ping_req *) * cnt);
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xid_seed = time(NULL) ^ getpid();
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for (i = 0; i < cnt; i++) {
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bzero((char *)&sin, sizeof(sin));
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sin.sin_family = AF_INET;
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bcopy((char *)&restricted_addrs[i],
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(char *)&sin.sin_addr, sizeof(struct in_addr));
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sin.sin_port = htons(__pmap_getport(&sin, YPPROG,
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YPVERS, IPPROTO_UDP));
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if (sin.sin_port == 0)
|
|
continue;
|
|
reqs[i] = calloc(1, sizeof(struct ping_req));
|
|
bcopy((char *)&sin, (char *)&reqs[i]->sin, sizeof(sin));
|
|
any = &reqs[i]->sin;
|
|
reqs[i]->xid = xid_seed;
|
|
xid_seed++;
|
|
validsrvs++;
|
|
}
|
|
|
|
/* Make sure at least one server was assigned */
|
|
if (!validsrvs) {
|
|
free(reqs);
|
|
return(-1);
|
|
}
|
|
|
|
/* Create RPC handle */
|
|
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
clnt = clntudp_create(any, YPPROG, YPVERS, tv, &sock);
|
|
if (clnt == NULL) {
|
|
close(sock);
|
|
for (i = 0; i < cnt; i++)
|
|
if (reqs[i] != NULL)
|
|
free(reqs[i]);
|
|
free(reqs);
|
|
return(-1);
|
|
}
|
|
clnt->cl_auth = authunix_create_default();
|
|
cu = (struct cu_data *)clnt->cl_private;
|
|
tv.tv_sec = 0;
|
|
clnt_control(clnt, CLSET_TIMEOUT, &tv);
|
|
ioctl(sock, FIONBIO, &dontblock);
|
|
oldfunc = clnt->cl_ops->cl_call;
|
|
clnt->cl_ops->cl_call = clntudp_a_call;
|
|
|
|
/* Transmit */
|
|
for (i = 0; i < cnt; i++) {
|
|
if (reqs[i] != NULL) {
|
|
/* subtract one; clntudp_call() will increment */
|
|
*((u_int32_t *)(cu->cu_outbuf)) = reqs[i]->xid - 1;
|
|
bcopy((char *)&reqs[i]->sin, (char *)&cu->cu_raddr,
|
|
sizeof(struct sockaddr_in));
|
|
ypproc_domain_nonack_2_send(&foo, clnt);
|
|
}
|
|
}
|
|
|
|
/* Receive reply */
|
|
ypproc_domain_nonack_2_recv(&foo, clnt);
|
|
|
|
/* Got a winner -- look him up. */
|
|
xid_lookup = *((u_int32_t *)(cu->cu_inbuf));
|
|
for (i = 0; i < cnt; i++) {
|
|
if (reqs[i] != NULL && reqs[i]->xid == xid_lookup) {
|
|
winner = i;
|
|
*port = reqs[i]->sin.sin_port;
|
|
}
|
|
}
|
|
|
|
/* Shut everything down */
|
|
clnt->cl_ops->cl_call = oldfunc;
|
|
auth_destroy(clnt->cl_auth);
|
|
clnt_destroy(clnt);
|
|
close(sock);
|
|
|
|
for (i = 0; i < cnt; i++)
|
|
if (reqs[i] != NULL)
|
|
free(reqs[i]);
|
|
free(reqs);
|
|
|
|
return(winner);
|
|
}
|