368 lines
10 KiB
C
368 lines
10 KiB
C
/* $NetBSD: clnt_generic.c,v 1.20 2002/11/08 00:13:07 fvdl 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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/*
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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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#if 0
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)clnt_generic.c 1.32 89/03/16 Copyr 1988 Sun Micro";
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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 <netinet/tcp.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 "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(hostname, prog, vers_out, vers_low, vers_high, nettype)
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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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(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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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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(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_tp_create();
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*/
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CLIENT *
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clnt_create(hostname, prog, vers, nettype)
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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(hostname, prog, vers, nconf)
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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_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(fd, nconf, svcaddr, prog, vers, sendsz, recvsz)
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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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int one = 1;
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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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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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/* XXX fvdl - is this useful? */
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if (strncmp(nconf->nc_protofmly, "inet", 4) == 0)
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setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one,
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sizeof (one));
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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, (char *) 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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