401 lines
11 KiB
C
401 lines
11 KiB
C
/* $NetBSD: clnt_generic.c,v 1.33 2014/05/28 14:45:19 christos Exp $ */
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/*
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* Copyright (c) 2010, Oracle America, Inc.
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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 are
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* met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1986-1991 by Sun Microsystems Inc.
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*/
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/* #ident "@(#)clnt_generic.c 1.20 94/05/03 SMI" */
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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_generic.c 1.32 89/03/16 Copyr 1988 Sun Micro";
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#else
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__RCSID("$NetBSD: clnt_generic.c,v 1.33 2014/05/28 14:45:19 christos Exp $");
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#endif
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#endif
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <assert.h>
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#include <stdio.h>
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#include <errno.h>
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#include <rpc/rpc.h>
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#include <rpc/nettype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "svc_fdset.h"
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#include "rpc_internal.h"
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#ifdef __weak_alias
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__weak_alias(clnt_create_vers,_clnt_create_vers)
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__weak_alias(clnt_create,_clnt_create)
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__weak_alias(clnt_tp_create,_clnt_tp_create)
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__weak_alias(clnt_tli_create,_clnt_tli_create)
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#endif
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/*
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* Generic client creation with version checking the value of
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* vers_out is set to the highest server supported value
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* vers_low <= vers_out <= vers_high AND an error results
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* if this can not be done.
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*/
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CLIENT *
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clnt_create_vers(
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const char * hostname,
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rpcprog_t prog,
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rpcvers_t * vers_out,
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rpcvers_t vers_low,
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rpcvers_t vers_high,
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const char * nettype)
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{
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CLIENT *clnt;
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struct timeval to;
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enum clnt_stat rpc_stat;
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struct rpc_err rpcerr;
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_DIAGASSERT(hostname != NULL);
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_DIAGASSERT(vers_out != NULL);
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/* XXX: nettype appears to support being NULL */
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clnt = clnt_create(hostname, prog, vers_high, nettype);
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if (clnt == NULL) {
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return (NULL);
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}
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to.tv_sec = 10;
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to.tv_usec = 0;
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rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void,
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NULL, (xdrproc_t) xdr_void, NULL, to);
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if (rpc_stat == RPC_SUCCESS) {
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*vers_out = vers_high;
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return (clnt);
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}
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if (rpc_stat == RPC_PROGVERSMISMATCH) {
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unsigned long minvers, maxvers;
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clnt_geterr(clnt, &rpcerr);
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minvers = rpcerr.re_vers.low;
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maxvers = rpcerr.re_vers.high;
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if (maxvers < vers_high)
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vers_high = (rpcvers_t)maxvers;
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if (minvers > vers_low)
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vers_low = (rpcvers_t)minvers;
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if (vers_low > vers_high) {
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goto error;
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}
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CLNT_CONTROL(clnt, CLSET_VERS, (char *)(void *)&vers_high);
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rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void,
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NULL, (xdrproc_t) xdr_void, NULL, to);
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if (rpc_stat == RPC_SUCCESS) {
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*vers_out = vers_high;
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return (clnt);
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}
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}
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clnt_geterr(clnt, &rpcerr);
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error:
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rpc_createerr.cf_stat = rpc_stat;
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rpc_createerr.cf_error = rpcerr;
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clnt_destroy(clnt);
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return (NULL);
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}
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/*
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* Top level client creation routine.
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* Generic client creation: takes (servers name, program-number, nettype) and
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* returns client handle. Default options are set, which the user can
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* change using the rpc equivalent of ioctl()'s.
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*
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* It tries for all the netids in that particular class of netid until
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* it succeeds.
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* XXX The error message in the case of failure will be the one
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* pertaining to the last create error.
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*
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* It calls clnt_tp_create();
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*/
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CLIENT *
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clnt_create(
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const char * hostname, /* server name */
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rpcprog_t prog, /* program number */
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rpcvers_t vers, /* version number */
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const char * nettype) /* net type */
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{
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struct netconfig *nconf;
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CLIENT *clnt = NULL;
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void *handle;
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enum clnt_stat save_cf_stat = RPC_SUCCESS;
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struct rpc_err save_cf_error;
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_DIAGASSERT(hostname != NULL);
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/* XXX: nettype appears to support being NULL */
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if ((handle = __rpc_setconf(nettype)) == NULL) {
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rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
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return (NULL);
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}
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rpc_createerr.cf_stat = RPC_SUCCESS;
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while (clnt == NULL) {
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if ((nconf = __rpc_getconf(handle)) == NULL) {
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if (rpc_createerr.cf_stat == RPC_SUCCESS)
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rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
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break;
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}
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#ifdef CLNT_DEBUG
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printf("trying netid %s\n", nconf->nc_netid);
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#endif
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clnt = clnt_tp_create(hostname, prog, vers, nconf);
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if (clnt)
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break;
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else
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/*
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* Since we didn't get a name-to-address
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* translation failure here, we remember
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* this particular error. The object of
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* this is to enable us to return to the
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* caller a more-specific error than the
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* unhelpful ``Name to address translation
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* failed'' which might well occur if we
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* merely returned the last error (because
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* the local loopbacks are typically the
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* last ones in /etc/netconfig and the most
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* likely to be unable to translate a host
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* name).
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*/
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if (rpc_createerr.cf_stat != RPC_N2AXLATEFAILURE) {
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save_cf_stat = rpc_createerr.cf_stat;
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save_cf_error = rpc_createerr.cf_error;
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}
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}
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/*
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* Attempt to return an error more specific than ``Name to address
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* translation failed''
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*/
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if ((rpc_createerr.cf_stat == RPC_N2AXLATEFAILURE) &&
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(save_cf_stat != RPC_SUCCESS)) {
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rpc_createerr.cf_stat = save_cf_stat;
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rpc_createerr.cf_error = save_cf_error;
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}
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__rpc_endconf(handle);
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return (clnt);
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}
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/*
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* Generic client creation: takes (servers name, program-number, netconf) and
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* returns client handle. Default options are set, which the user can
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* change using the rpc equivalent of ioctl()'s : clnt_control()
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* It finds out the server address from rpcbind and calls clnt_tli_create()
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*/
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CLIENT *
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clnt_tp_create(
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const char * hostname, /* server name */
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rpcprog_t prog, /* program number */
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rpcvers_t vers, /* version number */
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const struct netconfig *nconf) /* net config struct */
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{
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struct netbuf *svcaddr; /* servers address */
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CLIENT *cl = NULL; /* client handle */
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_DIAGASSERT(hostname != NULL);
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/* nconf is handled below */
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if (nconf == NULL) {
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rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
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return (NULL);
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}
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/*
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* Get the address of the server
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*/
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if ((svcaddr = __rpcb_findaddr(prog, vers, nconf, hostname,
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&cl)) == NULL) {
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/* appropriate error number is set by rpcbind libraries */
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return (NULL);
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}
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if (cl == NULL) {
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cl = clnt_tli_create(RPC_ANYFD, nconf, svcaddr,
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prog, vers, 0, 0);
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} else {
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/* Reuse the CLIENT handle and change the appropriate fields */
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if (CLNT_CONTROL(cl, CLSET_SVC_ADDR, (void *)svcaddr) == TRUE) {
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if (cl->cl_netid == NULL) {
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cl->cl_netid = strdup(nconf->nc_netid);
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if (cl->cl_netid == NULL)
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goto out;
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}
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if (cl->cl_tp == NULL) {
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cl->cl_tp = strdup(nconf->nc_device);
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if (cl->cl_tp == NULL)
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goto out;
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}
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(void) CLNT_CONTROL(cl, CLSET_PROG, (void *)&prog);
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(void) CLNT_CONTROL(cl, CLSET_VERS, (void *)&vers);
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} else {
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CLNT_DESTROY(cl);
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cl = clnt_tli_create(RPC_ANYFD, nconf, svcaddr,
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prog, vers, 0, 0);
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}
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}
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free(svcaddr->buf);
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free(svcaddr);
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return (cl);
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out:
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clnt_destroy(cl);
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return NULL;
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}
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/*
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* Generic client creation: returns client handle.
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* Default options are set, which the user can
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* change using the rpc equivalent of ioctl()'s : clnt_control().
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* If fd is RPC_ANYFD, it will be opened using nconf.
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* It will be bound if not so.
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* If sizes are 0; appropriate defaults will be chosen.
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*/
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CLIENT *
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clnt_tli_create(
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int fd, /* fd */
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const struct netconfig *nconf, /* netconfig structure */
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const struct netbuf *svcaddr, /* servers address */
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rpcprog_t prog, /* program number */
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rpcvers_t vers, /* version number */
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u_int sendsz, /* send size */
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u_int recvsz) /* recv size */
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{
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CLIENT *cl; /* client handle */
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bool_t madefd = FALSE; /* whether fd opened here */
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long servtype;
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struct __rpc_sockinfo si;
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/* nconf is handled below */
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_DIAGASSERT(svcaddr != NULL);
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if (fd == RPC_ANYFD) {
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if (nconf == NULL) {
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rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
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return (NULL);
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}
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fd = __rpc_nconf2fd(nconf);
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if (fd == -1)
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goto err;
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madefd = TRUE;
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servtype = nconf->nc_semantics;
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if (!__rpc_fd2sockinfo(fd, &si))
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goto err;
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(void)bindresvport(fd, NULL);
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} else {
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if (!__rpc_fd2sockinfo(fd, &si))
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goto err;
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servtype = __rpc_socktype2seman(si.si_socktype);
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if (servtype == -1) {
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rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
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return NULL;
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}
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}
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if (si.si_af != ((struct sockaddr *)svcaddr->buf)->sa_family) {
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rpc_createerr.cf_stat = RPC_UNKNOWNHOST; /* XXX */
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goto err1;
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}
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switch (servtype) {
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case NC_TPI_COTS_ORD:
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cl = clnt_vc_create(fd, svcaddr, prog, vers, sendsz, recvsz);
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if (!nconf || !cl)
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break;
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(void)__rpc_setnodelay(fd, &si);
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break;
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case NC_TPI_CLTS:
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cl = clnt_dg_create(fd, svcaddr, prog, vers, sendsz, recvsz);
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break;
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default:
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goto err;
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}
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if (cl == NULL)
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goto err1; /* borrow errors from clnt_dg/vc creates */
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if (nconf) {
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cl->cl_netid = strdup(nconf->nc_netid);
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if (cl->cl_netid == NULL)
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goto err0;
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cl->cl_tp = strdup(nconf->nc_device);
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if (cl->cl_tp == NULL)
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goto err0;
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} else {
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cl->cl_netid = __UNCONST("");
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cl->cl_tp = __UNCONST("");
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}
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if (madefd) {
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(void) CLNT_CONTROL(cl, CLSET_FD_CLOSE, NULL);
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/* (void) CLNT_CONTROL(cl, CLSET_POP_TIMOD, NULL); */
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};
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return (cl);
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err0:
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clnt_destroy(cl);
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err:
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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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err1: if (madefd)
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(void) close(fd);
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return (NULL);
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}
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/*
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* Don't block thse so interactive programs don't get stuck in lalaland.
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* (easier to do this than making connect(2) non-blocking..)
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*/
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int
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__clnt_sigfillset(sigset_t *ss) {
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static const int usersig[] = {
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SIGHUP, SIGINT, SIGQUIT, SIGTERM, SIGTSTP
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};
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if (sigfillset(ss) == -1)
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return -1;
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for (size_t i = 0; i < __arraycount(usersig); i++)
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if (sigdelset(ss, usersig[i]) == -1)
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return -1;
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return 0;
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}
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