468 lines
13 KiB
C
468 lines
13 KiB
C
/* $NetBSD: clnt_udp.c,v 1.13 1998/02/13 05:52:20 lukem Exp $ */
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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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char *sccsid = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)clnt_udp.c 2.2 88/08/01 4.0 RPCSRC";
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#else
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__RCSID("$NetBSD: clnt_udp.c,v 1.13 1998/02/13 05:52:20 lukem Exp $");
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#endif
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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 "namespace.h"
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <err.h>
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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 <unistd.h>
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#include <rpc/rpc.h>
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#include <rpc/pmap_clnt.h>
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#ifdef __weak_alias
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__weak_alias(clntudp_bufcreate,_clntudp_bufcreate);
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__weak_alias(clntudp_create,_clntudp_create);
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#endif
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/*
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* UDP bases client side rpc operations
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*/
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static enum clnt_stat clntudp_call __P((CLIENT *, u_long, xdrproc_t,
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caddr_t, xdrproc_t, caddr_t, struct timeval));
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static void clntudp_geterr __P((CLIENT *, struct rpc_err *));
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static bool_t clntudp_freeres __P((CLIENT *, xdrproc_t, caddr_t));
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static void clntudp_abort __P((CLIENT *));
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static bool_t clntudp_control __P((CLIENT *, u_int, char *));
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static void clntudp_destroy __P((CLIENT *));
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static struct clnt_ops udp_ops = {
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clntudp_call,
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clntudp_abort,
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clntudp_geterr,
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clntudp_freeres,
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clntudp_destroy,
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clntudp_control
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};
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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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/*
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* Create a UDP based client handle.
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* If *sockp<0, *sockp is set to a newly created UPD socket.
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* If raddr->sin_port is 0 a binder on the remote machine
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* is consulted for the correct port number.
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* NB: It is the clients responsibility to close *sockp.
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* NB: The rpch->cl_auth is initialized to null authentication.
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* Caller may wish to set this something more useful.
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*
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* wait is the amount of time used between retransmitting a call if
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* no response has been heard; retransmition occurs until the actual
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* rpc call times out.
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*
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* sendsz and recvsz are the maximum allowable packet sizes that can be
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* sent and received.
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*/
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CLIENT *
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clntudp_bufcreate(raddr, program, version, wait, sockp, sendsz, recvsz)
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struct sockaddr_in *raddr;
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u_long program;
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u_long version;
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struct timeval wait;
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int *sockp;
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u_int sendsz;
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u_int recvsz;
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{
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CLIENT *cl;
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struct cu_data *cu = NULL;
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struct timeval now;
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struct rpc_msg call_msg;
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cl = (CLIENT *)mem_alloc(sizeof(CLIENT));
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if (cl == NULL) {
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warnx("clntudp_create: out of memory");
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rpc_createerr.cf_stat = RPC_SYSTEMERROR;
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rpc_createerr.cf_error.re_errno = errno;
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goto fooy;
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}
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sendsz = ((sendsz + 3) / 4) * 4;
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recvsz = ((recvsz + 3) / 4) * 4;
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cu = (struct cu_data *)mem_alloc(sizeof(*cu) + sendsz + recvsz);
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if (cu == NULL) {
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warnx("clntudp_create: out of memory");
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rpc_createerr.cf_stat = RPC_SYSTEMERROR;
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rpc_createerr.cf_error.re_errno = errno;
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goto fooy;
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}
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cu->cu_outbuf = &cu->cu_inbuf[recvsz];
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(void)gettimeofday(&now, (struct timezone *)0);
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if (raddr->sin_port == 0) {
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u_short port;
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if ((port =
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pmap_getport(raddr, program, version, IPPROTO_UDP)) == 0) {
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goto fooy;
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}
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raddr->sin_port = htons(port);
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}
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cl->cl_ops = &udp_ops;
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cl->cl_private = (caddr_t)cu;
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cu->cu_raddr = *raddr;
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cu->cu_rlen = sizeof (cu->cu_raddr);
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cu->cu_wait = wait;
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cu->cu_total.tv_sec = -1;
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cu->cu_total.tv_usec = -1;
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cu->cu_sendsz = sendsz;
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cu->cu_recvsz = recvsz;
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call_msg.rm_xid = getpid() ^ now.tv_sec ^ now.tv_usec;
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call_msg.rm_direction = CALL;
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call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
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call_msg.rm_call.cb_prog = program;
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call_msg.rm_call.cb_vers = version;
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xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf,
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sendsz, XDR_ENCODE);
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if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) {
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goto fooy;
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}
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cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs));
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if (*sockp < 0) {
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int dontblock = 1;
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*sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (*sockp < 0) {
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rpc_createerr.cf_stat = RPC_SYSTEMERROR;
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rpc_createerr.cf_error.re_errno = errno;
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goto fooy;
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}
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/* attempt to bind to prov port */
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(void)bindresvport(*sockp, (struct sockaddr_in *)0);
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/* the sockets rpc controls are non-blocking */
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(void)ioctl(*sockp, FIONBIO, (char *) &dontblock);
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cu->cu_closeit = TRUE;
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} else {
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cu->cu_closeit = FALSE;
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}
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cu->cu_sock = *sockp;
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cl->cl_auth = authnone_create();
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return (cl);
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fooy:
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if (cu)
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mem_free((caddr_t)cu, sizeof(*cu) + sendsz + recvsz);
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if (cl)
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mem_free((caddr_t)cl, sizeof(CLIENT));
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return ((CLIENT *)NULL);
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}
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CLIENT *
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clntudp_create(raddr, program, version, wait, sockp)
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struct sockaddr_in *raddr;
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u_long program;
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u_long version;
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struct timeval wait;
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int *sockp;
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{
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return(clntudp_bufcreate(raddr, program, version, wait, sockp,
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UDPMSGSIZE, UDPMSGSIZE));
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}
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static enum clnt_stat
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clntudp_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)
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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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struct cu_data *cu = (struct cu_data *)cl->cl_private;
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XDR *xdrs;
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int outlen;
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int inlen;
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int fromlen;
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struct pollfd fd;
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int milliseconds = (cu->cu_wait.tv_sec * 1000) +
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(cu->cu_wait.tv_usec / 1000);
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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;
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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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}
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time_waited.tv_sec = 0;
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time_waited.tv_usec = 0;
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call_again:
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xdrs = &(cu->cu_outxdrs);
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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, &proc)) ||
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(! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
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(! (*xargs)(xdrs, argsp)))
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return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
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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)
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!= outlen) {
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cu->cu_error.re_errno = errno;
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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 (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
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return (cu->cu_error.re_status = RPC_TIMEDOUT);
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}
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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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fd.fd = cu->cu_sock;
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fd.events = POLLIN;
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for (;;) {
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switch (poll(&fd, 1, milliseconds)) {
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case 0:
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time_waited.tv_sec += cu->cu_wait.tv_sec;
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time_waited.tv_usec += cu->cu_wait.tv_usec;
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while (time_waited.tv_usec >= 1000000) {
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time_waited.tv_sec++;
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time_waited.tv_usec -= 1000000;
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}
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if ((time_waited.tv_sec < timeout.tv_sec) ||
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((time_waited.tv_sec == timeout.tv_sec) &&
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(time_waited.tv_usec < timeout.tv_usec)))
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goto send_again;
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return (cu->cu_error.re_status = RPC_TIMEDOUT);
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/*
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* buggy in other cases because time_waited is not being
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* updated.
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*/
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case -1:
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if (errno == EINTR)
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continue;
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cu->cu_error.re_errno = errno;
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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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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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/* 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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/* 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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/*
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* It's possible for xdr_replymsg() to fail partway
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* through its attempt to decode the result from the
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* server. If this happens, it will leave the reply
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* structure partially populated with dynamically
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* allocated memory. (This can happen if someone uses
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* clntudp_bufcreate() to create a CLIENT handle and
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* specifies a receive buffer size that is too small.)
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* This memory must be free()ed to avoid a leak.
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*/
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int op = reply_xdrs.x_op;
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reply_xdrs.x_op = XDR_FREE;
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xdr_replymsg(&reply_xdrs, &reply_msg);
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reply_xdrs.x_op = op;
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cu->cu_error.re_status = RPC_CANTDECODERES;
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}
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return (cu->cu_error.re_status);
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}
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static void
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clntudp_geterr(cl, errp)
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CLIENT *cl;
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struct rpc_err *errp;
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{
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struct cu_data *cu = (struct cu_data *)cl->cl_private;
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*errp = cu->cu_error;
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}
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static bool_t
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clntudp_freeres(cl, xdr_res, res_ptr)
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CLIENT *cl;
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xdrproc_t xdr_res;
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caddr_t res_ptr;
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{
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struct cu_data *cu = (struct cu_data *)cl->cl_private;
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XDR *xdrs = &(cu->cu_outxdrs);
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xdrs->x_op = XDR_FREE;
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return ((*xdr_res)(xdrs, res_ptr));
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}
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/*ARGSUSED*/
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static void
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clntudp_abort(cl)
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CLIENT *cl;
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{
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}
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static bool_t
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clntudp_control(cl, request, info)
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CLIENT *cl;
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u_int request;
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char *info;
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{
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struct cu_data *cu = (struct cu_data *)cl->cl_private;
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switch (request) {
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case CLSET_TIMEOUT:
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cu->cu_total = *(struct timeval *)info;
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break;
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case CLGET_TIMEOUT:
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*(struct timeval *)info = cu->cu_total;
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break;
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case CLSET_RETRY_TIMEOUT:
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cu->cu_wait = *(struct timeval *)info;
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break;
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case CLGET_RETRY_TIMEOUT:
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*(struct timeval *)info = cu->cu_wait;
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break;
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case CLGET_SERVER_ADDR:
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*(struct sockaddr_in *)info = cu->cu_raddr;
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break;
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default:
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return (FALSE);
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}
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return (TRUE);
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}
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static void
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clntudp_destroy(cl)
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CLIENT *cl;
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{
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struct cu_data *cu = (struct cu_data *)cl->cl_private;
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if (cu->cu_closeit) {
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(void)close(cu->cu_sock);
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}
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XDR_DESTROY(&(cu->cu_outxdrs));
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mem_free((caddr_t)cu, (sizeof(*cu) + cu->cu_sendsz + cu->cu_recvsz));
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mem_free((caddr_t)cl, sizeof(CLIENT));
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}
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