44443e425f
3-clause BSD license as specified by Oracle America, Inc. in 2010. This license change was approved by Wim Coekaerts, Senior Vice President, Linux and Virtualization at Oracle Corporation.
449 lines
13 KiB
C
449 lines
13 KiB
C
/* $NetBSD: clnt_generic.c,v 1.18 2000/07/06 03:10:34 christos Exp $ */
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/*-
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* Copyright (c) 2010, Oracle America, Inc.
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* 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 are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials 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 "AS IS"
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* AND 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* #ident "@(#)clnt_generic.c 1.40 99/04/21 SMI" */
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "from: @(#)clnt_generic.c 1.4 87/08/11 (C) 1987 SMI";
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static char *sccsid = "from: @(#)clnt_generic.c 2.2 88/08/01 4.0 RPCSRC";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Copyright (c) 1986-1996,1998 by Sun Microsystems, Inc.
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* All rights reserved.
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*/
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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/fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <stdio.h>
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#include <errno.h>
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#include <netdb.h>
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#include <syslog.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 "un-namespace.h"
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#include "rpc_com.h"
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extern bool_t __rpc_is_local_host(const char *);
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int __rpc_raise_fd(int);
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#ifndef NETIDLEN
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#define NETIDLEN 32
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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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* It calls clnt_create_vers_timed() with a NULL value for the timeout
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* pointer, which indicates that the default timeout should be used.
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*/
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CLIENT *
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clnt_create_vers(const char *hostname, rpcprog_t prog, rpcvers_t *vers_out,
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rpcvers_t vers_low, rpcvers_t vers_high, const char *nettype)
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{
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return (clnt_create_vers_timed(hostname, prog, vers_out, vers_low,
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vers_high, nettype, NULL));
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}
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/*
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* This the routine has the same definition as clnt_create_vers(),
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* except it takes an additional timeout parameter - a pointer to
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* a timeval structure. A NULL value for the pointer indicates
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* that the default timeout value should be used.
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*/
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CLIENT *
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clnt_create_vers_timed(const char *hostname, rpcprog_t prog,
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rpcvers_t *vers_out, rpcvers_t vers_low, rpcvers_t vers_high,
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const char *nettype, const struct timeval *tp)
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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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clnt = clnt_create_timed(hostname, prog, vers_high, nettype, tp);
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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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(char *)NULL, (xdrproc_t)xdr_void, (char *)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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while (rpc_stat == RPC_PROGVERSMISMATCH && vers_high > vers_low) {
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unsigned int 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 = maxvers;
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else
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vers_high--;
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if (minvers > vers_low)
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vers_low = 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 *)&vers_high);
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rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t)xdr_void,
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(char *)NULL, (xdrproc_t)xdr_void,
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(char *)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_create_timed() with the default timeout.
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*/
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CLIENT *
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clnt_create(const char *hostname, rpcprog_t prog, rpcvers_t vers,
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const char *nettype)
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{
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return (clnt_create_timed(hostname, prog, vers, nettype, NULL));
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}
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/*
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* This the routine has the same definition as clnt_create(),
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* except it takes an additional timeout parameter - a pointer to
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* a timeval structure. A NULL value for the pointer indicates
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* that the default timeout value should be used.
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*
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* This function calls clnt_tp_create_timed().
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*/
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CLIENT *
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clnt_create_timed(const char *hostname, rpcprog_t prog, rpcvers_t vers,
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const char *netclass, const struct timeval *tp)
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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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char nettype_array[NETIDLEN];
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char *nettype = &nettype_array[0];
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if (netclass == NULL)
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nettype = NULL;
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else {
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size_t len = strlen(netclass);
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if (len >= sizeof (nettype_array)) {
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rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
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return (NULL);
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}
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strcpy(nettype, netclass);
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}
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if ((handle = __rpc_setconf((char *)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_timed(hostname, prog, vers, nconf, tp);
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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). We also check for a more
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* meaningful error than ``unknown host
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* name'' for the same reasons.
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*/
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if (rpc_createerr.cf_stat != RPC_N2AXLATEFAILURE &&
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rpc_createerr.cf_stat != RPC_UNKNOWNHOST) {
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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'' or ``unknown host name''
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*/
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if ((rpc_createerr.cf_stat == RPC_N2AXLATEFAILURE ||
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rpc_createerr.cf_stat == RPC_UNKNOWNHOST) &&
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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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* It calls clnt_tp_create_timed() with the default timeout.
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*/
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CLIENT *
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clnt_tp_create(const char *hostname, rpcprog_t prog, rpcvers_t vers,
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const struct netconfig *nconf)
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{
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return (clnt_tp_create_timed(hostname, prog, vers, nconf, NULL));
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}
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/*
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* This has the same definition as clnt_tp_create(), except it
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* takes an additional parameter - a pointer to a timeval structure.
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* A NULL value for the timeout pointer indicates that the default
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* value for the timeout should be used.
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*/
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CLIENT *
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clnt_tp_create_timed(const char *hostname, rpcprog_t prog, rpcvers_t vers,
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const struct netconfig *nconf, const struct timeval *tp)
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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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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_timed(prog, vers,
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(struct netconfig *)nconf, (char *)hostname,
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&cl, (struct timeval *)tp)) == 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_tp == NULL)
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cl->cl_tp = strdup(nconf->nc_device);
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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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}
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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(int fd, const struct netconfig *nconf,
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struct netbuf *svcaddr, rpcprog_t prog, rpcvers_t vers,
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uint sendsz, uint recvsz)
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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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int one = 1;
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struct __rpc_sockinfo si;
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extern int __rpc_minfd;
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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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if (fd < __rpc_minfd)
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fd = __rpc_raise_fd(fd);
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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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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:
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cl = clnt_vc_create(fd, svcaddr, prog, vers, sendsz, recvsz);
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break;
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case NC_TPI_COTS_ORD:
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if (nconf && ((strcmp(nconf->nc_protofmly, "inet") == 0))) {
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_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one,
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sizeof (one));
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}
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cl = clnt_vc_create(fd, svcaddr, prog, vers, sendsz, recvsz);
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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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cl->cl_tp = strdup(nconf->nc_device);
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} else {
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cl->cl_netid = "";
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cl->cl_tp = "";
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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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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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* To avoid conflicts with the "magic" file descriptors (0, 1, and 2),
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* we try to not use them. The __rpc_raise_fd() routine will dup
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* a descriptor to a higher value. If we fail to do it, we continue
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* to use the old one (and hope for the best).
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*/
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int __rpc_minfd = 3;
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int
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__rpc_raise_fd(int fd)
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{
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int nfd;
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if (fd >= __rpc_minfd)
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return (fd);
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if ((nfd = _fcntl(fd, F_DUPFD, __rpc_minfd)) == -1)
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return (fd);
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if (_fsync(nfd) == -1) {
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_close(nfd);
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return (fd);
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}
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if (_close(fd) == -1) {
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/* this is okay, we will syslog an error, then use the new fd */
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(void) syslog(LOG_ERR,
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"could not close() fd %d; mem & fd leak", fd);
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}
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return (nfd);
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}
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