1/*	$NetBSD: clnt_simple.c,v 1.21 2000/07/06 03:10:34 christos Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * - Redistributions of source code must retain the above copyright notice,
12 *   this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 *   this list of conditions and the following disclaimer in the documentation
15 *   and/or other materials provided with the distribution.
16 * - Neither the name of Sun Microsystems, Inc. nor the names of its
17 *   contributors may be used to endorse or promote products derived
18 *   from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32/*
33 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
34 */
35
36/*
37 * clnt_simple.c
38 * Simplified front end to client rpc.
39 *
40 */
41
42#include "namespace.h"
43#include "reentrant.h"
44#include <sys/param.h>
45#include <stdio.h>
46#include <errno.h>
47#include <rpc/rpc.h>
48#include <string.h>
49#include <stdlib.h>
50#include <fcntl.h>
51#include <unistd.h>
52#include "un-namespace.h"
53#include "mt_misc.h"
54
55#ifndef MAXHOSTNAMELEN
56#define	MAXHOSTNAMELEN 64
57#endif
58
59#ifndef NETIDLEN
60#define	NETIDLEN 32
61#endif
62
63struct rpc_call_private {
64	int	valid;			/* Is this entry valid ? */
65	CLIENT	*client;		/* Client handle */
66	pid_t	pid;			/* process-id at moment of creation */
67	rpcprog_t prognum;		/* Program */
68	rpcvers_t versnum;		/* Version */
69	char	host[MAXHOSTNAMELEN];	/* Servers host */
70	char	nettype[NETIDLEN];	/* Network type */
71};
72static struct rpc_call_private *rpc_call_private_main;
73static thread_key_t rpc_call_key;
74static once_t rpc_call_once = ONCE_INITIALIZER;
75static int rpc_call_key_error;
76
77static void rpc_call_key_init(void);
78static void rpc_call_destroy(void *);
79
80static void
81rpc_call_destroy(void *vp)
82{
83	struct rpc_call_private *rcp = (struct rpc_call_private *)vp;
84
85	if (rcp) {
86		if (rcp->client)
87			CLNT_DESTROY(rcp->client);
88		free(rcp);
89	}
90}
91
92static void
93rpc_call_key_init(void)
94{
95
96	rpc_call_key_error = thr_keycreate(&rpc_call_key, rpc_call_destroy);
97}
98
99/*
100 * This is the simplified interface to the client rpc layer.
101 * The client handle is not destroyed here and is reused for
102 * the future calls to same prog, vers, host and nettype combination.
103 *
104 * The total time available is 25 seconds.
105 *
106 * host    - host name
107 * prognum - program number
108 * versnum - version number
109 * procnum - procedure number
110 * inproc, outproc -  in/out XDR procedures
111 * in, out - recv/send data
112 * nettype - nettype
113 */
114enum clnt_stat
115rpc_call(const char *host, const rpcprog_t prognum, const rpcvers_t versnum,
116    const rpcproc_t procnum, const xdrproc_t inproc, const char *in,
117    const xdrproc_t outproc, char *out, const char *nettype)
118{
119	struct rpc_call_private *rcp = (struct rpc_call_private *) 0;
120	enum clnt_stat clnt_stat;
121	struct timeval timeout, tottimeout;
122	int main_thread = 1;
123
124	if ((main_thread = thr_main())) {
125		rcp = rpc_call_private_main;
126	} else {
127		if (thr_once(&rpc_call_once, rpc_call_key_init) != 0 ||
128		    rpc_call_key_error != 0) {
129			rpc_createerr.cf_stat = RPC_SYSTEMERROR;
130			rpc_createerr.cf_error.re_errno = rpc_call_key_error;
131			return (rpc_createerr.cf_stat);
132		}
133		rcp = (struct rpc_call_private *)thr_getspecific(rpc_call_key);
134	}
135	if (rcp == NULL) {
136		rcp = malloc(sizeof (*rcp));
137		if (rcp == NULL) {
138			rpc_createerr.cf_stat = RPC_SYSTEMERROR;
139			rpc_createerr.cf_error.re_errno = errno;
140			return (rpc_createerr.cf_stat);
141		}
142		if (main_thread)
143			rpc_call_private_main = rcp;
144		else
145			thr_setspecific(rpc_call_key, (void *) rcp);
146		rcp->valid = 0;
147		rcp->client = NULL;
148	}
149	if ((nettype == NULL) || (nettype[0] == 0))
150		nettype = "netpath";
151	if (!(rcp->valid && rcp->pid == getpid() &&
152		(rcp->prognum == prognum) &&
153		(rcp->versnum == versnum) &&
154		(!strcmp(rcp->host, host)) &&
155		(!strcmp(rcp->nettype, nettype)))) {
156		int fd;
157
158		rcp->valid = 0;
159		if (rcp->client)
160			CLNT_DESTROY(rcp->client);
161		/*
162		 * Using the first successful transport for that type
163		 */
164		rcp->client = clnt_create(host, prognum, versnum, nettype);
165		rcp->pid = getpid();
166		if (rcp->client == NULL) {
167			return (rpc_createerr.cf_stat);
168		}
169		/*
170		 * Set time outs for connectionless case.  Do it
171		 * unconditionally.  Faster than doing a t_getinfo()
172		 * and then doing the right thing.
173		 */
174		timeout.tv_usec = 0;
175		timeout.tv_sec = 5;
176		(void) CLNT_CONTROL(rcp->client,
177				CLSET_RETRY_TIMEOUT, (char *)(void *)&timeout);
178		if (CLNT_CONTROL(rcp->client, CLGET_FD, (char *)(void *)&fd))
179			_fcntl(fd, F_SETFD, 1);	/* make it "close on exec" */
180		rcp->prognum = prognum;
181		rcp->versnum = versnum;
182		if ((strlen(host) < (size_t)MAXHOSTNAMELEN) &&
183		    (strlen(nettype) < (size_t)NETIDLEN)) {
184			(void) strcpy(rcp->host, host);
185			(void) strcpy(rcp->nettype, nettype);
186			rcp->valid = 1;
187		} else {
188			rcp->valid = 0;
189		}
190	} /* else reuse old client */
191	tottimeout.tv_sec = 25;
192	tottimeout.tv_usec = 0;
193	/*LINTED const castaway*/
194	clnt_stat = CLNT_CALL(rcp->client, procnum, inproc, (char *) in,
195	    outproc, out, tottimeout);
196	/*
197	 * if call failed, empty cache
198	 */
199	if (clnt_stat != RPC_SUCCESS)
200		rcp->valid = 0;
201	return (clnt_stat);
202}
203